JP3723112B2

JP3723112B2 - Container body manufacturing method

Info

Publication number: JP3723112B2
Application number: JP2001303962A
Authority: JP
Inventors: 俊雄織田島
Original assignee: 株式会社セブン・セブン
Priority date: 2001-09-28
Filing date: 2001-09-28
Publication date: 2005-12-07
Anticipated expiration: 2021-09-28
Also published as: JP2003102618A

Description

【０００１】
【発明の属する技術分野】
本発明は、調理鍋等の容器体の製造方法に関するものである。
【０００２】
【従来の技術及び発明が解決しようとする課題】
シチュー等の煮込み料理を作る鍋として、容器を内容器と外容器とから成る二層構造とした保温性の高い調理鍋（容器体）が種々提案されている。尚、この調理鍋を用いての煮込み料理は、該調理鍋をコンロや電磁調理器等の加熱装置上に載置して調理物をある程度まで煮込んだ後、該加熱装置上から調理鍋を除去し、そのまま該調理鍋の保温性を利用して煮込みを進行させて作るものである。
【０００３】
しかし、この種の二層構造の調理鍋は、底部が内容器の底壁と外容器の底壁とから成る二層構造である為、加熱装置での加熱が二層構造である分、調理物に伝達されにいという問題があり、更に、内容器と外容器との間を保温性の高い真空断熱層にした場合、より一層調理物に伝達されにくくなる。
【０００４】
従って、二層構造を採用する場合には、内容器の底壁と外容器の底壁とは密着状態にする手段が採用されるが、このような手段を採用しても、わずかな歪みや寸法誤差によって内容器の底壁と外容器の底壁との間に真空断熱層が形成されてしまうことがあり、しかも、この内容器の底壁と外容器の底壁との間に形成された該真空断熱層は、存在の有無を確認する有効な手段が無い。
【０００５】
更に、この種の二層構造の調理鍋は、内容器と外容器との間を空気断熱層とした場合、空気断熱層が真空断熱層より熱損失が大きいことは勿論、空気膨張による爆発事故が報告され、安全性に問題がある。
【０００６】
本発明は、上記問題点を解決し得る調理鍋を効率的に製造する技術を提供するものである。
【０００７】
【課題を解決するための手段】
添付図面を参照して本発明の要旨を説明する。
【０００８】
側部２と底部３とから成り、側部２は真空断熱二層構造が採用され、底部３は一層構造が採用された容器体４を製造する方法であって、側壁７ａと底開口部９を有する底壁７ｂとから成り上部が開口した外容器体７の内部に、上部に前記外容器体７の側壁７ａの上部を隠蔽するカール加工部 23 を設けた側壁６ａと底壁６ｂとから成り上部が開口した内容器体６を重合状態で配設して該内容器体６の底壁６ｂの一部を前記底部３とするとともに、前記内容器体６と前記外容器体７を前記カール加工部 23 の内面と前記外容器体７の上端縁との間に隙間 27 が形成されるようにし、続いて、前記内容器体６と外容器体７を底壁６ｂ・７ｂが上側となる状態となるようにするとともに、外容器体７の底開口部９の周縁部 10 と内容器体６の底壁６ｂとの間に下部ロウ付材 12 を挟持状態で配設し且つ前記外容器体７の側壁７ａの外面と前記カール加工部 23 との境界部に上部ロウ付材 21 を配設し、続いて、この重合状態の内容器体６と外容器体７とを真空加熱炉に配設し、前記下部ロウ付材 12 を熔融せしめて内容器体６に対して外容器体７を降下摺動させ、その後、該下部ロウ付材 12 及び前記上部ロウ付材 21 を固化させて前記内容器体６の側壁６ａの上部と前記外容器体７の側壁７ａの上部とを接合すると共に前記内容器体６の底壁６ｂと前記外容器体７の底開口部９の周縁部10とを接合し且つ前記内容器体６の側壁６ａと前記外容器体７の側壁７ａとの間を真空封止することで、前記側部２に真空断熱層８を形成することを特徴とする容器体の製造方法に係るものである。
【０００９】
また、請求項１記載の容器体の製造方法において、外容器体７の側壁７ａの上部に外方に向けて突出する鍔部26を設け、内容器体６の側壁６ａの上部にカール加工部23を形成して該カール加工部23により前記鍔部26を被覆し、その後、重合状態の内容器体６と外容器体７を底壁６ｂ・７ｂが上側となる状態にすると共に、該外容器体７の側壁７ａの外面と前記カール加工部23との境界部及びカール加工部23の内側にして該カール加工部23と前記鍔部26との間に夫々上部ロウ付材21・25を配設して該重合状態の内容器体６と外容器体７とを真空加熱炉に配設することを特徴とする容器体の製造方法に係るものである。
【００１０】
また、請求項１，２いずれか１項に記載の容器体の製造方法において、内容器体６の側壁６ａの上部に形成したカール加工部23は、断面視Ｃ字状に構成され、更にこの断面視Ｃ字状のカール加工部23の先端部に上方に折曲して延設され外容器体７の側壁７ａの外面に添設される添設部24が設けられたカール加工部23であり、且つ、外容器体７と内容器体６とは、内容器体６に対して外容器体７が上下摺動可能となるように配設され、この外容器体７の上下摺動は、前記添設部24にガイドされてなされる重合状態であることを特徴とする容器体の製造方法に係るものである。
【００１１】
また、請求項１〜３いずれか１項に記載の容器体の製造方法において、内容器体６の底壁６ａに外容器体７の底壁７ａの底開口部９から突出して該外容器体７に対する該内容器体６の径方向の位置を決定する位置決め突部13を設け、この位置決め突部13の外縁と底開口部９の縁との間に間隙を設け、外容器体７の内部に内容器体６を重合状態で配設し前記位置決め突部13を前記底開口部９から突出せしめて内容器体６の底壁６ｂの一部を前記底部３とし、続いて、前記内容器体６の側部６ａの上部と前記外容器体７の側部７ａの上部との間に上部ロウ付材21を配設せしめと共に、前記位置決め突部13の外縁と底開口部９の縁との間の間隙からロウ付材12を該外容器体７の底開口部９の周縁部10と内容器体６の底壁６ｂとの間に挟持状態で配設することを特徴とする容器体の製造方法に係るものである。
【００１２】
また、請求項１〜４いずれか１項に記載の容器体の製造方法において、外容器体７の底開口部９の周縁部10の上面を水平面に設定し、内容器体６に該水平面と面当接する水平面を設け、この外容器体７の水平面と内容器体６の水平面との間に下部ロウ付材12を挟持状態で配設せしめることを特徴とする容器体の製造方法に係るものである。
【００１３】
また、側部２と底部３とから成り、側部２は真空断熱二層構造が採用され、底部３は一層構造が採用された容器体４を製造する方法であって、側壁７ａと底壁７ｂとから成り上部が開口した外容器体７の内部に、上部に前記外容器体７の側壁７ａの上部を隠蔽するカール加工部 23 を設けた側壁６ａと底開口部を有する底壁６ｂとから成り上部が開口した内容器体６を重合状態で配設して該外容器体７の底壁７ｂの一部を前記底部３とするとともに、前記内容器体６と前記外容器体７を前記カール加工部 23 の内面と前記外容器体７の上端縁との間に隙間 27 が形成されるようにし、続いて、前記内容器体６と外容器体７を底壁６ｂ・７ｂが上側となる状態となるようにするとともに、内容器体６の底開口部の周縁部と外容器体７の底壁７ｂとの間に下部ロウ付材 12 を挟持状態で配設し且つ前記外容器体７の側壁７ａの外面と前記カール加工部 23 との境界部に上部ロウ付材 21 を配設し、続いて、この重合状態の内容器体６と外容器体７とを真空加熱炉に配設し、前記下部ロウ付材 12 を熔融せしめて内容器体６に対して外容器体７を降下摺動させ、その後、該下部ロウ付材 12 及び前記上部ロウ付材 21 を固化させて前記内容器体６の側壁６ａの上部と前記外容器体７の側壁７ａの上部とを接合すると共に前記外容器体７の底壁７ｂと前記内容器体６の底開口部の周縁部とを接合し且つ前記内容器体６の側壁６ａと前記外容器体７の側壁７ａとの間を真空封止することで、前記側部２に真空断熱層８を形成することを特徴とする容器体の製造方法に係るものである。
【００１４】
【発明の作用及び効果】
本発明により製造される容器体４は、側部２は真空断熱二層構造が採用されているから高い保温性を発揮し、しかも、底部３は一層構造が採用されているから該容器体４に入れる調理物に良好に伝熱することができ、よって、高い保温性と調理物への良好な伝熱性とを兼ね備えたものとなる。
【００１５】
ところで、従来の二層構造の容器体は、上部開口部と側壁と底壁とを夫々有する内容器体と外容器体とを重合せしめ、この内容器体の上部と外容器体の上部との間にロウ付材を配設し、該重合状態の内容器体と外容器体とを真空加熱炉に入れ、内容器体と外容器体との間を真空にすると共に前記ロウ付材を熔融せしめて該内容器体の上部と外容器体の上部を封止することで該内容器体と外容器体との間に真空断熱層を形成している。
【００１６】
本発明は、上記従来の二層構造の容器体の製造方法と同様に、効率的な製造が可能となる。
【００１７】
更に、本発明は、容器体４の底部３を一層構造とする為の外容器体７の底開口部９を利用して該底開口部９の縁と内容器体６の底壁６ｂとの間からロウ付材12を導入するから、該ロウ付材12を真空封止に適した位置に簡単且つ確実に配設することができる。
【００１８】
本発明は上述のようにするから、高い保温性と調理物への良好な伝熱性とを兼ね備えた容器体を簡単且つ効率的に製造できる実用性に秀れた容器体の製造方法となる。
【００１９】
【発明の実施の形態】
図１〜３は第一実施例、図４は第二実施例、図５は第三実施例を図示したものであり、以下に説明する。
【００２０】
第一実施例は、内容器体６の側壁６ａの上部と外容器体７の側壁７ａの上部を予め接合してから、該内容器体６の側壁６ａと外容器体７の側壁７ａとの間に真空断熱部８を形成することで、上部開口部１と側部２と底部３とを有し、側部２は真空断熱二層構造が採用され、底部３は一層構造が採用された容器体４を製造する方法である。
【００２１】
先ず、この容器体４の構成について詳述する（図１参照）。
【００２２】
容器体４の側部２は、前記内容器体６の側壁６ａ，前記外容器体７の側壁７ａ及び両者の間に設けられた真空断熱層８から成る真空断熱二層構造が採用され、前記容器体４の底部３は、前記内容器体６の底壁６ｂのみが存在する一層構造が採用されている。
【００２３】
また、内容器体６の底壁６ｂには、外容器体７の該内容器体６に対する径方向の位置を決定する位置決め突部13が設けられている。尚、図面の位置決め突部13は、底開口部９の内縁と略嵌合する構造を図示している。
【００２４】
更に、位置決め突部13の下面は、外容器体７の底壁７ｂより下方に位置するように構成されている。従って、この外容器体７の底開口部９から突出する内容器体６の位置決め突部13の下面と、外容器体７の底開口部９の周縁部10の下面との間には段差が形成され、容器体４を水平面に載置した際、該水平面には内容器体６の位置決め突部13のみが当接することになる。
【００２５】
尚、前記段差は、約０．３ｍｍ程度が良い。
【００２６】
また、内容器体６の位置決め突部13の外縁と外容器体７の底開口部９の縁との間には、後記ロウ付材12が配設される間隙が設けられている。
【００２７】
また、内容器体６の位置決め突部13の中央部には、凹部14が設けられている。
【００２８】
また、内容器体６の底壁６ｂ、具体的に、前記位置決め突部13の周縁には、外容器体７の底開口部９の周縁部10が嵌合する嵌合凹部11が設けられている。
【００２９】
また、この嵌合凹部11の下面は、水平面に設定されている。尚、第一実施例における水平とは、容器体４を水平面に載置した際の略水平という意味である。
【００３０】
外容器体７に設けられた前記底開口部９の周縁部10の上面は、前記下面が水平面に設定された嵌合凹部11と面当接し得るように水平面に設定されている。
【００３１】
尚、この周縁部10の上面と嵌合凹部11の下面との面当接部位は、位置決め突部13の周囲に所定巾を有するリング状に形成されるが、この所定巾が５ｍｍ程度となるように該周縁部10や嵌合凹部11の水平面を設定すると良い。
【００３２】
また、内容器体６の肉厚は外容器体７の肉厚より厚く設定されている。この点詳述すると、第一実施例は、容器体４の底部３の略全面を内容器体６の底壁６ｂのみの一層構造とする為、容器体４の強度上の観点から、内容器体６はある程度肉厚が厚いものが採用される。一方、外容器体７も内容器体６と同様の肉厚とすると、容器体４の重量が重くなって取り扱い性が悪化する為、この容器体４の取り扱い性の観点から、外容器体７はある程度肉厚が薄いものが採用される。
【００３３】
容器体４の上部内面、具体的に、内容器体６の側壁６ａの上部内面には、容器体４の上部開口部１を閉塞する蓋体５を載置し得る蓋載置段部15と、中蓋体16を載置し得る中蓋載置段部17が設けられている。
【００３４】
中蓋体16は、本体は透明ガラス製で、且つ、上部中央部に摘持部18が設けられたものが採用されている。
【００３５】
蓋体５は、本体の内部に断熱材が充填され、且つ、上部中央部に摘持部19が設けられたものが採用されている。
【００３６】
符号20は、容器体４若しくは容器体そのものを持ち運ぶ際に把持する把持部20である。
【００３７】
次に、容器体４の製造方法について詳述する。
【００３８】
先ず、内容器体６と外容器体７を形成する。
【００３９】
この内容器体６と外容器体７は、共に金属製の筒状体を変形加工して形成する。
【００４０】
内容器体６の底部６ｂに、前記位置決め突部13を形成する。また、この位置決め突部13は、外容器体７の底開口部９の略全域から該位置決め突部13が突出し、且つ、この位置決め突部13の下面が外容器体７の底開口部９の内縁の下面より下方に突出し得るように形成する。また、この位置決め突部13の外縁は底開口部９の内縁より径小に設定しており、この径の差により、該位置決め突部13の外縁と底開口部９の内縁との間から後記下部ロウ付材12を導入し得るように設定している。
【００４１】
また、内容器体６の位置決め突部13の周縁には、前記外容器体７の底開口部９の周縁部10が嵌合して該周縁部10の上面と水平面同志で接合される嵌合凹部11を形成する。
【００４２】
また、内容器体６の位置決め突部13の略中央部には、凹部14を形成する。
【００４３】
また、内容器体６の側部６ａの上部には、前記蓋載置段部15及び前記中蓋載置段部17を形成する。
【００４４】
外容器体７の底部７ｂの略全域には底開口部９を形成する。
【００４５】
また、外容器体７の底開口部９の周縁部10の上面には前記嵌合凹部11の下面と水平面同志で接合される水平面を形成する。
【００４６】
尚、必要に応じて内容器体６の上部や外容器体７の上部に両者を良好に接合する為の構造を形成しても良い。
【００４７】
次に、この内容器体６と外容器体７を接合し、容器体４とする。
【００４８】
先ず、内容器体６と外容器体７とを重合状態とする。この状態において、外容器体７の底開口部９から位置決め突部13が突出し、該内容器体６と外容器体７とは径方向に対して位置決めされることになる。
【００４９】
続いて、内容器体６の側壁６ａの上部と外容器体７の側壁７ａの上部とを接合する。この側壁６ａ・７ａの上部同志の接合は、例えば、アルゴン溶接等により行う。
【００５０】
続いて、重合状態の内容器体６と外容器体７における内容器体６の位置決め突部13の周縁と外容器体７の底開口部９の縁との間から所定温度で熔融するロウ付材12を導入し、該ロウ付材12を内容器体６の嵌合凹部11と外容器体７の底開口部９の周縁部10との間に挟持状態で配設する（図２参照）。尚、図面はロウ付材12として線材状のものを採用し、該線材状のロウ付材12を外容器体７の底開口部９の周縁部10にリング状に配設する場合を図示している。
【００５１】
続いて、ロウ付材12が配設され且つ重合状態の内容器体６及び外容器体７を真空加熱炉に導入する。
【００５２】
続いて、真空加熱炉内を真空にしていくことで、前記内容器体６の位置決め突部13の外縁と外容器体７の底開口部９の内縁との間から該内容器体６の側壁６ａと外容器体７の側壁７ａとの間の空気を徐々に抜いて真空にしていく。また、真空加熱炉内を真空にしていく際、真空加熱炉内を加熱して前記ロウ付材12の熔融温度に近づけていく。
【００５３】
続いて、真空加熱炉内が真空となることで前記内容器体６の側壁６ａと外容器体７の側壁７ａとの間を真空とした後、真空加熱炉内を前記ロウ付材12が熔融する温度に加熱して該ロウ付材12を熔融せしめ、内容器体６の側壁６ａと外容器体７の側壁７ａとの間を真空封止する。この際、熔融したロウ付材12の殆どは、内容器体６の嵌合凹部11と外容器体７の底開口部９の周縁部10との間に行き渡る。また、ロウ付材12の余剰分は、該ロウ付材12の配設に利用した内容器体６の位置決め突部13の外縁と外容器体７の底開口部９の内縁との間から漏洩し、該部位に溜まることができる。
【００５４】
続いて、真空加熱炉内を冷却することで前記熔融したロウ付材12を固化せしめ、内容器体６の側壁６ａと外容器体７の側壁７ａとの間に真空断熱層８を形成する。
【００５５】
以上の工程により、上部開口部１と側部２と底部３とを有し、側部２は内容器体６の側壁６ａと外容器体７の側壁７ａと真空断熱層８から成る真空断熱二層構造が採用され、底部３は内容器体６の底壁６ｂのみが存在する一層構造が採用された容器体４を製造することができる。
【００５６】
この第一実施例の容器体４と、真空断熱層８を空気断熱層とした以外は全く第一実施例の容器体４と同じ構造の比較例とで水を１００℃に沸騰させた後の温度低下がどのようになるか、比較実験を行ったところ、１，２，３時間後の温度は、第一実施例の容器体４では夫々７９.２℃，６９.２℃，６１.８℃であったが、比較例では夫々７３.２℃，６３.２℃，５６.７℃であった。このように第一実施例の容器体４は温度低下が緩やかであるから、当該第一実施例の容器体４を用いて良好な煮込み料理を行えるものと推測される。即ち、煮込み料理において調理物に味が良くしみ込む場面は、加熱が終了した後に温度がある程度低下する場面と言われており、第一実施例は前記緩やかな温度低下期間を有効利用して味の良い煮込み料理を調理できると推測される。
【００５７】
第一実施例は上述のようにするから、高い保温性と調理物への良好な伝熱性とを兼ね備えた容器体４を従来の二層構造の容器体と同様の方法によって効率的に製造できる実用性，生産性に秀れた容器体の製造方法となる。
【００５８】
また、ロウ付材12は、容器体４の底部３を一層構造とする為の外容器体７の底開口部９を利用して該底開口部９の縁と内容器体６の位置決め突部13の周縁との間から導入するから、該ロウ付材12の配設は非常に簡単に行うことができ、この点においても実用性，生産性に秀れることになる。
【００５９】
また、熔融したロウ付材12の余剰分が内容器体６の位置決め突部13の周縁と外容器体７の底開口部９の縁との間の溜まることができるから、内容器体６の底壁６ｂと外容器体７の底壁７ｂとの間にロウ付材12が適正に介在することになり、内容器体６と外容器体７との接合を適正に行うことができる。更に、余剰分のロウ付材12が容器体４の外部に突出したりせず、よって、該余剰分のロウ付材12を除去する工程が不要で生産性も高いことになる。
【００６０】
また、容器体４の底部３は、調理物と直接当接する内容器体６の底壁６ｂとなるから、この底部３に加えられた熱が非常に良好に調理物に伝達されることになり、この点においても伝熱性に秀れた容器体４が得られることになる。
【００６１】
また、従前の空気断熱タイプの容器体では、空気膨張により外容器体から内容器体が突然飛び出すという事故が報告されているが、第一実施例により製造された容器体４は真空断熱構造が採用されているから、このような事故のおそれはなく、安全性に秀れたものとになる。
【００６２】
また、内容器体６の位置決め突部13が単なる位置決め突部であると、容器体４を電磁調理器に載置した際、前記位置決め突部の僅かな凹凸により、該容器体４が位置決め突部の中央部（容器体４の重心に相当）を支点にコマのように回転してしまう現象が起こることがあるが、第一実施例により製造された容器体４では、位置決め突部13の中央部が凹部14であるから、該凹部14が回転に支点になることはあり得ず、よって、前記回転現象の問題も解消されることになる。
【００６３】
また、内容器体６の嵌合凹部11に外容器体７の底開口部９の周縁部10を嵌合するから、この内容器体６と外容器体７とが強固に固定されることになり、容器体４の強度が秀れることになる。
【００６４】
また、この内容器体６の嵌合凹部11と外容器体７の底開口部９の周縁部10とを水平面同志で接合するから、容器体４の底部３に内容器体６と外容器体７が接合している部位が所定巾を有するリング状に形成され、この面接合部位によって容器体４の底部３の強度をより一層高めることになる。
【００６５】
また、内容器体６の位置決め突部13や嵌合凹部11等は、筒状体を変形加工することによって形成しているから、加工硬化によって強度が高く、この強度の高い位置決め突部13や嵌合凹部11等によっても容器体４が補強され、この点においても強度の高い容器体４が得られることになる。
【００６６】
また、内容器体６の肉厚を外容器体７の肉厚より厚く設定したから、容器体４の底部３の強度を保ちつつ、軽くて取り扱い性に秀れた容器体４を製造することができる。
【００６７】
また、内容器体６の底壁６ｂの位置決め突部13が外容器体７の底壁７ｂに設けられた底開口部９より突出せしめているから、製造された容器体４を水平面に載置した際、底開口部９の周縁が前記水平面を傷つけたりせず、よって、容器体４を載置する部位が水平面の電磁調理器を傷つけたりすることが防止され、この点においても実用性に秀れた容器体４を製造することができる。
尚、第一実施例は、容器体４の底部３を内容器体６の底壁６ｂによって形成する場合を説明したが、例えば、内容器体６の底壁６ｂに底開口部を設け、この底開口部から外容器体７の底壁７ｂが容器体４の内面に露出せしめて容器体４の底部３を形成する方法を採用しても良い。
【００６８】
第二実施例は、第一実施例と異なり、内容器体６の側壁６ａの上部と外容器体７の側壁７ａの上部を予め接合せず、該内容器体６の側壁６ａの外容器体７の側壁７ａの間に真空断熱層８を形成する際に、内容器体６の側壁６ａの上部と外容器体７の側壁７ａの接合、及び、内容器体６の底壁６ｂ（位置決め突部13の周縁）と外容器体７の底壁７ｂ（底開口部９の周縁部10）の接合を同時に行うことで、上部開口部１と側部２と底部３とを有し、側部２は真空断熱二層構造が採用され、底部３は一層構造が採用された容器体４を製造するものである。
【００６９】
この第二実施例では、内容器体６の側壁６ａの上部と外容器体７の側壁７ａの上部とを上部ロウ付材21で接合し、内容器体６の底壁６ｂと外容器体７の底壁７ｂとを前記第一実施例と同様に下部ロウ付材12で接合する方法を採用している。
【００７０】
上部ロウ付材21及び下部ロウ付材12は、略同温で熔融するものを採用する。
【００７１】
下部ロウ付材12は、第一実施例と同様の方法により内容器体６の底壁６ｂと外容器体７の底壁７ｂとの間に配設する。一方、上部ロウ付材21は、内容器体６の側壁７ａの上部若しくは外容器体７の側壁７ａの上部に該上部ロウ付材21を配設する為の構造を設けてから配設する。
【００７２】
この上部ロウ付材21を配設する為の構造は、内容器体６の側壁６ａの上部に外容器体７の側壁７ａの上部を隠蔽するカール加工部23を形成することで設けている。従って、外容器体７内に内容器体６を重合せしめた際、前記カール加工部23は外容器体７の外方に突出し、このカール加工部23の下部と外容器体７の側壁７ａとの間に上部ロウ付材21を配設することができる。
【００７３】
また、前記カール加工部23は断面視Ｃ字状のものが採用され、この断面視Ｃ字状のカール加工部23は該カール加工部23の内側に折曲せしめられる（湾曲でも良い）ことで外容器体７の側壁７ａの外面に沿って上方に延設された添設部24を形成している。
【００７４】
また、内容器体６のカール加工部23は、内容器体６と外容器体７を重合させ且つ上部ロウ付材21及び下部ロウ付材12を夫々所定の位置に配設した状態において、該カール加工部23の上部内面と外容器体７の上端縁との間に間隙27が形成されるように設定している。
【００７５】
尚、このカール加工部23は、内容器体６と外容器体７を重合する前に形成しても、重合した後に形成しても良い。
【００７６】
以下、この第二実施例における内容器体６と外容器体７との接合方法及び真空断熱層８の形成方法について詳述する。
【００７７】
内容器体６と外容器体７を重合し、該内容器体６の位置決め突部13の周縁と外容器体７の底開口部９の縁の間から下部ロウ付材12を導入し、該ロウ付材12を内容器体６の嵌合凹部11と外容器体７の底開口部９の周縁部10との間に挟持状態で配設する点は第一実施例と同様である。
【００７８】
一方、上部ロウ付材21の配設は、重合状態の底壁６ｂ・７ｂが上側となる状態とし、この状態において、外容器体７の側壁７ａの外面と、該外容器体７の側壁７ａの外面から突出する前記カール加工部23との間に上部ロウ付材21を載置することにより行う（図４参照）。
【００７９】
尚、この重合状態で且つ底壁６ｂ・７ｂが上側となる状態の内容器体６と外容器体７に対して前記下部ロウ付材12の配設を行う方法を採用しても良い。
【００８０】
続いて、この重合状態で且つ底壁６ｂ・７ｂが上側となる状態の内容器体６と外容器体７を真空加熱炉に導入し、第一実施例と同様に該内容器体６の側壁６ａと外容器体７の側壁７ａの間を真空とし、続いて、前記上部ロウ付材21及び下部ロウ付材12を熔融せしめる。
【００８１】
この上部ロウ付材21及び下部ロウ付材12の熔融の際、前記カール加工部23の上部内面と外容器体７の上端縁との間に前記間隙27 が存在するから、下部ロウ付材12が熔融すると内容器体６に対して外容器体７が前記添設部24に沿って降下摺動することができる。従って、この外容器体７の降下摺動により、該外容器体７の底壁７ｂと内容器体６の底壁６ａｂとの間隙、即ち、外容器体７の底開口部９の周縁部10と内容器体６の位置決め突部13の周縁に設けられた嵌合凹部11との間隙が適正なものとなり、該間隙に下部ロウ付材12が適正に行き渡ることになる。更に、この外容器体７の降下摺動により、前記外容器体７の側壁７ａの外面と前記カール加工部23との間に載置され且つ熔融した上部ロウ付材21が、該カール加工部23の添設部24と外容器体７の側壁７ａとの間に引き込まれ、よって、この上部ロウ付材21による接合も良好に行われる。
【００８２】
上部ロウ付材21及び下部ロウ付材12を熔融せしめた後、第一実施例と同様、真空加熱炉内を冷却することで前記熔融した上部ロウ付材21及び下部ロウ付材12を固化せしめ、内容器体６の側壁６ａと外容器体７の側壁７ａとの間に真空断熱層８を形成する。
【００８３】
第二実施例は上述のように、内容器体６と外容器体７の接合を真空断熱層８の形成と同時に行うから、それだけ工程が少なく、容器体４を簡単に製造できる実用性，生産性に秀れた容器体の製造方法となる。
【００８４】
また、上部ロウ付材21を配設する為の構造は、内容器体６にカール加工部23を形成するだけで設けているから、この構造の形成は簡易であり、この点においても生産性に秀れることになる。
【００８５】
また、上部ロウ付材21及び下部ロウ付材12を熔融せしめると内容器体６に対して外容器体７が降下摺動し得るから、該上部ロウ付材21及び下部ロウ付材12による内容器体６と外容器体７の接合を極めて適正に行うことができ、この点においても生産性，強度に秀れることになる。
【００８６】
尚、その余は第一実施例と同様である。
【００８７】
第三実施例は第二実施例の別例であり、外容器体７の側壁７ａの上部に外方に向けて突出する鍔部26を設け、この鍔部26を内容器体６に設けたカール加工部23で被覆し、このカール加工部23の内側にして該カール加工部23と前記鍔部26との間にも上部ロウ付材25を配設せしめるものである（図５参照）。
【００８８】
この第三実施例によれば、内容器体６のカール加工部23と外容器体７の側壁７ａとの接合は、該カール加工部23の先端部の上下に夫々配設される上部ロウ付材21・25によって行われるから、それだけ接合が確実に行われ、且つ、接合強度も高くなる。
【００８９】
更に、外容器体７に設けた鍔部26が熔融した上部ロウ付材21・25の受部となるから、該上部ロウ付材21・25が内容器体６のカール加工部23と外容器体７の側壁７ａとの接合に有効に利用され、よって、この点においても接合が確実且つ強固に行われる。
【００９０】
尚、図面はカール加工部23の上部内面と外容器体７の上端縁（第三実施例の場合鍔部26）との間に間隙が存在しない場合を図示したが、第二実施例と同様に該部位に間隙を設けて上部ロウ付材21・25及び下部ロウ付材12の熔融によって内容器体６に対して外容器体７が降下摺動し得るように構成しても良い。
【００９１】
また、その余は第二実施例と同様である。
【図面の簡単な説明】
【図１】第一実施例の説明側断面図である。
【図２】第一実施例の真空加熱炉に導入する前の容器体４の底部３の説明拡大側断面図である。
【図３】第一実施例の真空加熱炉に導入した後の容器体４の底部３の説明拡大側断面図である。
【図４】第二実施例の容器体４の上部（図１中の符号Ａ部分）の説明拡大側断面図である。尚、この図４は図１と上下逆向きである。
【図５】第三実施例の容器体４の上部（図１中の符号Ａ部分）の説明拡大側断面図である。尚、この図５は図１と上下逆向きである。
【符号の説明】
２側部
３底部
４容器体
５蓋体
６内容器体
６ａ側壁
６ｂ底壁
７外容器体
７ａ側壁
７ｂ底壁
８真空断熱層
９底開口部
10 周縁部
11 嵌合凹部
12 ロウ付材，下部ロウ付材
13 位置決め突部
14 凹部
21 上部ロウ付材
23 カール加工部
24 添設部
25 上部ロウ付材
27 間隙 [0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for manufacturing a container such as a cooking pot.
[0002]
[Prior art and problems to be solved by the invention]
  Various hot pots (containers) having a two-layered structure consisting of an inner container and an outer container have been proposed as pots for stewed dishes such as stews. In addition, the stewed dish using this cooking pan is placed on a heating device such as a stove or an electromagnetic cooker to boil the food to a certain extent, and then the cooking pan is removed from the heating device. Then, as it is, it is made by using the heat retaining property of the cooking pan and allowing the stew to proceed.
[0003]
  However, this type of two-layer cooking pot has a two-layer structure in which the bottom part is composed of the bottom wall of the inner container and the bottom wall of the outer container. There is a problem that it is difficult to be transmitted to an object, and further, when a vacuum heat insulating layer with high heat retention is provided between the inner container and the outer container, it is more difficult to transmit to the food.
[0004]
  Therefore, when adopting a two-layer structure, means for bringing the bottom wall of the inner container and the bottom wall of the outer container into close contact with each other is adopted. Due to dimensional errors, a vacuum insulation layer may be formed between the bottom wall of the inner container and the bottom wall of the outer container, and it is formed between the bottom wall of the inner container and the bottom wall of the outer container. The vacuum heat insulating layer has no effective means for confirming the presence or absence.
[0005]
  In addition, this type of two-layer cooking pan has an air insulation layer with a larger heat loss than the vacuum insulation layer when the space between the inner and outer containers is an air insulation layer. Is reported and there is a safety problem.
[0006]
  The present invention provides a technique for efficiently producing a cooking pot capable of solving the above problems.
[0007]
[Means for Solving the Problems]
  The gist of the present invention will be described with reference to the accompanying drawings.
[0008]
  The side part 2 is composed of a side part 2 and a bottom part 3. The side part 2 is a method of manufacturing a container body 4 adopting a vacuum heat insulation two-layer structure, and the bottom part 3 is a single layer structure, and includes a side wall 7a and a bottom opening part 9. In the inside of the outer container body 7 having a bottom wall 7b havingA curled portion for concealing the upper part of the side wall 7a of the outer container body 7 at the upper part twenty three ProvidedAn inner container body 6 having a side wall 6a and a bottom wall 6b and having an open top is disposed in a superposed state, and a part of the bottom wall 6b of the inner container body 6 is disposed on the bottom 3The inner container body 6 and the outer container body 7 are connected to the curled portion. twenty three A gap between the inner surface of the outer container body 7 and the upper edge of the outer container body 7 27 Then, the inner container body 6 and the outer container body 7 are placed in a state where the bottom walls 6b and 7b are on the upper side, and the peripheral edge portion of the bottom opening 9 of the outer container body 7 is formed. Ten And brazing material between the bottom wall 6b of the inner container body 6 12 Between the outer surface of the side wall 7a of the outer container body 7 and the curled portion twenty three Upper brazing material at the boundary with twenty one Subsequently, the inner container body 6 and the outer container body 7 in the polymerization state are disposed in a vacuum heating furnace, and the lower brazing material is disposed. 12 The outer container body 7 is lowered and slid with respect to the inner container body 6, and then the lower brazing material 12 And the upper brazing material twenty one SolidifyThe upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 are joined, and the peripheral wall 10b of the bottom wall 6b of the inner container body 6 and the bottom opening 9 of the outer container body 7 is joined. And a vacuum heat insulation layer 8 is formed on the side portion 2 by vacuum-sealing between the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7. The present invention relates to a method for manufacturing a container body.
[0009]
  Claims1In the container body manufacturing method described above, a flange portion 26 protruding outward is provided on the upper portion of the side wall 7a of the outer container body 7, and a curling portion 23 is formed on the upper portion of the side wall 6a of the inner container body 6. The curled portion 23 covers the flange portion 26, and then the inner container body 6 and the outer container body 7 in a superposed state are brought into a state where the bottom walls 6b and 7b are on the upper side, and the side walls of the outer container body 7 are disposed. The upper brazing materials 21 and 25 are respectively disposed between the curled portion 23 and the flange portion 26 at the boundary between the outer surface of 7a and the curled portion 23 and the inside of the curled portion 23. The present invention relates to a method of manufacturing a container body, wherein the inner container body 6 and the outer container body 7 in a polymerized state are disposed in a vacuum heating furnace.
[0010]
  Claims1 or 2In the container body manufacturing method described above, the curled portion 23 formed on the upper portion of the side wall 6a of the inner container body 6 is configured in a C shape in a sectional view, and further, the tip of the curled portion 23 in the C shape in a sectional view. A curling portion 23 provided with an attaching portion 24 that is bent upward and is attached to the outer surface of the side wall 7a of the outer container body 7, and the outer container body 7 and the inner container body 6 is arranged such that the outer container body 7 can slide up and down with respect to the inner container body 6, and the upper and lower sliding of the outer container body 7 is guided by the attachment portion 24. The present invention relates to a method for manufacturing a container body in a polymerized state.
[0011]
  Claims1-3In the method for manufacturing a container body according to any one of the above, the inner container body 6 protrudes from the bottom opening 9 of the bottom wall 7a of the outer container body 7 to the bottom wall 6a of the inner container body 6 with respect to the outer container body 7. A positioning projection 13 for determining the position in the radial direction is provided, a gap is provided between the outer edge of the positioning projection 13 and the edge of the bottom opening 9, and the inner container body 6 is superposed inside the outer container body 7. The positioning protrusion 13 protrudes from the bottom opening 9 so that a part of the bottom wall 6b of the inner container body 6 becomes the bottom part 3, and then the side 6a of the inner container body 6 An upper brazing material 21 is disposed between the upper portion and the upper portion of the side portion 7 a of the outer container body 7, and brazed from the gap between the outer edge of the positioning projection 13 and the edge of the bottom opening 9. The material 12 is disposed in a sandwiched state between the peripheral edge 10 of the bottom opening 9 of the outer container body 7 and the bottom wall 6b of the inner container body 6. Those relating to the manufacturing method of the body.
[0012]
  Claims1-4In the method for manufacturing a container body according to any one of the above, the upper surface of the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7 is set to a horizontal plane, and the inner container body 6 is provided with a horizontal plane that makes surface contact with the horizontal plane. The lower brazing material 12 is disposed in a sandwiched state between the horizontal surface of the outer container body 7 and the horizontal surface of the inner container body 6.
[0013]
  The side part 2 is a method for manufacturing a container body 4 having a vacuum heat insulation two-layer structure, and the bottom part 3 is a single layer structure, and includes a side wall 7a and a bottom wall. 7b and inside the outer container body 7 whose upper part is open,A curled portion for concealing the upper part of the side wall 7a of the outer container body 7 at the upper part twenty three ProvidedAn inner container body 6 consisting of a side wall 6a and a bottom wall 6b having a bottom opening is disposed in a superposed state, and a part of the bottom wall 7b of the outer container body 7 is placed in the bottom 3The inner container body 6 and the outer container body 7 are connected to the curled portion. twenty three A gap between the inner surface of the outer container body 7 and the upper edge of the outer container body 7 27 Then, the inner container body 6 and the outer container body 7 are placed in a state where the bottom walls 6b and 7b are on the upper side, and the peripheral edge portion of the bottom opening of the inner container body 6 is formed. And brazing material between the bottom wall 7b of the outer container body 7 12 Between the outer surface of the side wall 7a of the outer container body 7 and the curled portion twenty three Upper brazing material at the boundary with twenty one Subsequently, the inner container body 6 and the outer container body 7 in the polymerization state are disposed in a vacuum heating furnace, and the lower brazing material is disposed. 12 The outer container body 7 is lowered and slid with respect to the inner container body 6, and then the lower brazing material 12 And the upper brazing material twenty one Is solidified to join the upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 together with the bottom wall 7b of the outer container body 7 and the bottom opening of the inner container body 6. A vacuum heat insulating layer 8 is formed on the side portion 2 by joining a peripheral edge and vacuum-sealing between the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7. Method for manufacturing container bodyIt is related to.
[0014]
[Action and effect of the invention]
  The container body 4 manufactured according to the present invention exhibits high heat retention because the side portion 2 employs a vacuum heat insulating two-layer structure, and the bottom portion 3 employs a single layer structure. Heat can be satisfactorily transferred to the food to be put in, so that it has both high heat retention and good heat transfer to the food.
[0015]
  By the way, the container body of the conventional two-layer structure superposes an inner container body and an outer container body each having an upper opening, a side wall, and a bottom wall, and the upper part of the inner container body and the upper part of the outer container body are A brazing material is disposed between the inner container body and the outer container body in a polymerized state in a vacuum heating furnace, and a vacuum is formed between the inner container body and the outer container body and the brazing material is melted. The upper part of the inner container body and the upper part of the outer container body are sealed to form a vacuum heat insulating layer between the inner container body and the outer container body.
[0016]
  The present invention,UpAs in the conventional method for producing a container having a two-layer structure, efficient production is possible.
[0017]
  Further, according to the present invention, the bottom opening 9 of the outer container body 7 for making the bottom 3 of the container body 4 into a single layer structure is used to connect the edge of the bottom opening 9 and the bottom wall 6b of the inner container body 6. Since the brazing material 12 is introduced from between, the brazing material 12 can be easily and reliably disposed at a position suitable for vacuum sealing.
[0018]
  Since the present invention is as described above, a container body manufacturing method excellent in practicality capable of easily and efficiently manufacturing a container body having both high heat retention and good heat transfer to a cooked product.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  1 to 3 show the first embodiment, FIG. 4 shows the second embodiment, and FIG. 5 shows the third embodiment, which will be described below.
[0020]
  In the first embodiment, after the upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 are joined in advance, the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7 are By forming the vacuum heat insulating part 8 between them, it has an upper opening 1, a side part 2 and a bottom part 3, the side part 2 adopts a vacuum heat insulating two-layer structure, and the bottom part 3 adopts a single layer structure. This is a method for manufacturing the container body 4.
[0021]
  First, the configuration of the container body 4 will be described in detail (see FIG. 1).
[0022]
  The side part 2 of the container body 4 employs a vacuum heat insulating two-layer structure including a side wall 6a of the inner container body 6, a side wall 7a of the outer container body 7, and a vacuum heat insulating layer 8 provided therebetween. The bottom 3 of the container body 4 employs a single layer structure in which only the bottom wall 6b of the inner container body 6 exists.
[0023]
  Further, a positioning protrusion 13 is provided on the bottom wall 6 b of the inner container body 6 to determine the radial position of the outer container body 7 with respect to the inner container body 6. Incidentally, the positioning protrusion 13 in the drawing shows a structure that is substantially fitted to the inner edge of the bottom opening 9.
[0024]
  Furthermore, the lower surface of the positioning protrusion 13 is configured to be positioned below the bottom wall 7 b of the outer container body 7. Therefore, there is a step between the lower surface of the positioning projection 13 of the inner container body 6 protruding from the bottom opening 9 of the outer container body 7 and the lower surface of the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7. When the container body 4 is formed and placed on a horizontal plane, only the positioning protrusion 13 of the inner container body 6 comes into contact with the horizontal plane.
[0025]
  The step is preferably about 0.3 mm.
[0026]
  Further, a gap is provided between the outer edge of the positioning protrusion 13 of the inner container body 6 and the edge of the bottom opening 9 of the outer container body 7 in which the brazing material 12 described later is disposed.
[0027]
  A recess 14 is provided at the center of the positioning protrusion 13 of the inner container body 6.
[0028]
  Further, a fitting recess 11 into which the peripheral edge 10 of the bottom opening 9 of the outer container body 7 is fitted is provided on the bottom wall 6 b of the inner container body 6, specifically, the peripheral edge of the positioning protrusion 13. Yes.
[0029]
  Further, the lower surface of the fitting recess 11 is set on a horizontal plane. In addition, the horizontal in 1st Example means the substantially horizontal when the container body 4 is mounted in the horizontal surface.
[0030]
  The upper surface of the peripheral edge portion 10 of the bottom opening 9 provided in the outer container body 7 is set to a horizontal plane so that the lower surface can come into surface contact with the fitting recess 11 set to a horizontal plane.
[0031]
  The surface abutting portion between the upper surface of the peripheral edge 10 and the lower surface of the fitting recess 11 is formed in a ring shape having a predetermined width around the positioning protrusion 13, and this predetermined width is about 5 mm. Thus, it is preferable to set the horizontal plane of the peripheral edge portion 10 and the fitting recess 11.
[0032]
  The wall thickness of the inner container body 6 is set to be thicker than the wall thickness of the outer container body 7. This point will be described in detail. In the first embodiment, since the substantially entire surface of the bottom 3 of the container body 4 has a single-layer structure consisting of only the bottom wall 6b of the inner container body 6, from the viewpoint of strength of the container body 4, the inner container The body 6 has a certain thickness. On the other hand, if the outer container body 7 has the same wall thickness as the inner container body 6, the container body 4 becomes heavy and the handleability deteriorates. From the viewpoint of the handleability of the container body 4, the outer container body 7 The one with a small thickness is adopted.
[0033]
  On the upper inner surface of the container body 4, specifically, on the upper inner surface of the side wall 6 a of the inner container body 6, a lid placing step portion 15 capable of placing a lid body 5 that closes the upper opening 1 of the container body 4; An inner lid placing step portion 17 on which the inner lid body 16 can be placed is provided.
[0034]
  As the inner lid body 16, a body made of transparent glass and having a gripping portion 18 at the upper center portion is adopted.
[0035]
  As the lid 5, a body in which the inside of the main body is filled with a heat insulating material and a gripping portion 19 is provided in the upper central portion is adopted.
[0036]
  Reference numeral 20 denotes a grip portion 20 that is gripped when the container body 4 or the container body itself is carried.
[0037]
  Next, the manufacturing method of the container body 4 will be described in detail.
[0038]
  First, the inner container body 6 and the outer container body 7 are formed.
[0039]
  Both the inner container body 6 and the outer container body 7 are formed by deforming a metal cylindrical body.
[0040]
  The positioning protrusion 13 is formed on the bottom 6 b of the inner container body 6. The positioning protrusion 13 protrudes from substantially the entire area of the bottom opening 9 of the outer container body 7, and the lower surface of the positioning protrusion 13 is the bottom opening 9 of the outer container body 7. It is formed so as to protrude downward from the lower surface of the inner edge. Further, the outer edge of the positioning projection 13 is set to be smaller in diameter than the inner edge of the bottom opening 9, and due to the difference in diameter, it will be described later from between the outer edge of the positioning projection 13 and the inner edge of the bottom opening 9. The lower brazing material 12 is set to be introduced.
[0041]
  Further, the peripheral edge 10 of the bottom opening 9 of the outer container body 7 is fitted to the peripheral edge of the positioning protrusion 13 of the inner container body 6 and is joined to the upper surface of the peripheral edge part 10 in a horizontal plane. A recess 11 is formed.
[0042]
  Further, a concave portion 14 is formed at a substantially central portion of the positioning protrusion 13 of the inner container body 6.
[0043]
  Further, the lid placing step portion 15 and the inner lid placing step portion 17 are formed on the upper portion of the side portion 6 a of the inner container body 6.
[0044]
  A bottom opening 9 is formed in substantially the entire area of the bottom 7 b of the outer container body 7.
[0045]
  In addition, a horizontal plane is formed on the upper surface of the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7 so as to be joined to the lower surface of the fitting recess 11 in a horizontal plane.
[0046]
  In addition, you may form the structure for joining both well to the upper part of the inner container body 6 and the upper part of the outer container body 7 as needed.
[0047]
  Next, the inner container body 6 and the outer container body 7 are joined to form a container body 4.
[0048]
  First, the inner container body 6 and the outer container body 7 are brought into a polymerized state. In this state, the positioning protrusion 13 protrudes from the bottom opening 9 of the outer container body 7, and the inner container body 6 and the outer container body 7 are positioned in the radial direction.
[0049]
  Then, the upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 are joined. The joining between the upper portions of the side walls 6a and 7a is performed by, for example, argon welding.
[0050]
  Subsequently, brazing is performed at a predetermined temperature between the peripheral edge of the positioning protrusion 13 of the inner container body 6 and the edge of the bottom opening 9 of the outer container body 7 in the inner container body 6 and the outer container body 7 in a polymerized state. The material 12 is introduced, and the brazing material 12 is disposed between the fitting recess 11 of the inner container body 6 and the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7 (see FIG. 2). . The drawing shows a case where a wire-like material is adopted as the brazing material 12 and the wire-like brazing material 12 is arranged in a ring shape on the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7. ing.
[0051]
  Subsequently, the inner container body 6 and the outer container body 7 in which the brazing material 12 is disposed and in a polymerized state are introduced into a vacuum heating furnace.
[0052]
  Subsequently, the side wall of the inner container body 6 is formed between the outer edge of the positioning projection 13 of the inner container body 6 and the inner edge of the bottom opening 9 of the outer container body 7 by evacuating the vacuum heating furnace. The air between 6a and the side wall 7a of the outer container body 7 is gradually extracted to make a vacuum. Further, when the vacuum heating furnace is evacuated, the vacuum heating furnace is heated to approach the melting temperature of the brazing material 12.
[0053]
  Subsequently, after the vacuum heating furnace is evacuated, the space between the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7 is evacuated, and then the brazing material 12 is melted in the vacuum heating furnace. The brazing material 12 is melted by heating to a temperature, and the space between the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7 is vacuum-sealed. At this time, most of the molten brazing material 12 is distributed between the fitting recess 11 of the inner container body 6 and the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7. Further, the surplus portion of the brazing material 12 leaks from between the outer edge of the positioning projection 13 of the inner container body 6 used for the arrangement of the brazing material 12 and the inner edge of the bottom opening 9 of the outer container body 7. However, it can accumulate at the site.
[0054]
  Subsequently, the melted brazing material 12 is solidified by cooling the inside of the vacuum heating furnace, and the vacuum heat insulating layer 8 is formed between the side wall 6 a of the inner container body 6 and the side wall 7 a of the outer container body 7.
[0055]
  Through the above steps, the upper opening 1, the side 2, and the bottom 3 are provided, and the side 2 includes the side wall 6 a of the inner container body 6, the side wall 7 a of the outer container body 7, and the vacuum heat insulating layer 8. A layer structure is adopted, and the container body 4 adopting a single layer structure in which only the bottom wall 6b of the inner container body 6 is present at the bottom 3 can be manufactured.
[0056]
  After boiling the water at 100 ° C. in the container body 4 of the first embodiment and a comparative example having the same structure as the container body 4 of the first embodiment except that the vacuum heat insulating layer 8 is an air heat insulating layer. When a comparative experiment was conducted to see how the temperature decreased, the temperatures after 1, 2, and 3 hours were 79.2 ° C., 69.2 ° C., and 61.8 respectively for the container body 4 of the first example. However, in the comparative examples, they were 73.2 ° C, 63.2 ° C, and 56.7 ° C, respectively. Thus, since the container body 4 of 1st Example has a moderate temperature fall, it is estimated that favorable stewed food can be performed using the container body 4 of the said 1st Example. That is, the scene in which the taste is soaked well in the cooked dish is said to be a scene in which the temperature drops to some extent after the heating is completed, and the first embodiment effectively uses the mild temperature decrease period to improve the taste. It is estimated that good stewed food can be cooked.
[0057]
  Since the first embodiment is as described above, the container body 4 having both high heat retention and good heat transfer to the cooked product can be efficiently manufactured by the same method as the conventional two-layer container body. This is a method for manufacturing a container body with excellent practicality and productivity.
[0058]
  The brazing material 12 uses the bottom opening 9 of the outer container body 7 to form the bottom 3 of the container body 4 in a single layer structure, and the positioning protrusion of the inner container body 6 and the edge of the bottom opening 9. Since the brazing material 12 is introduced from between the peripheral edges of the thirteen, the brazing material 12 can be arranged very easily. In this respect, the practicality and productivity are excellent.
[0059]
  Further, since the excess portion of the molten brazing material 12 can be accumulated between the peripheral edge of the positioning projection 13 of the inner container body 6 and the edge of the bottom opening 9 of the outer container body 7, Since the brazing material 12 is appropriately interposed between the bottom wall 6b and the bottom wall 7b of the outer container body 7, the inner container body 6 and the outer container body 7 can be appropriately joined. Further, the surplus brazing material 12 does not protrude outside the container body 4, so that a process for removing the surplus brazing material 12 is unnecessary and the productivity is high.
[0060]
  Moreover, since the bottom part 3 of the container body 4 serves as the bottom wall 6b of the inner container body 6 that directly contacts the cooked product, the heat applied to the bottom part 3 is very well transmitted to the cooked product. Also in this respect, the container body 4 excellent in heat conductivity can be obtained.
[0061]
  In the conventional air insulation type container body, there has been reported an accident that the inner container body suddenly jumps out of the outer container body due to air expansion, but the container body 4 manufactured according to the first embodiment has a vacuum insulation structure. Since it is adopted, there is no fear of such an accident and it will be excellent in safety.
[0062]
  Further, if the positioning protrusion 13 of the inner container body 6 is a simple positioning protrusion, when the container body 4 is placed on an electromagnetic cooker, the container body 4 is positioned by the slight unevenness of the positioning protrusion. Although the phenomenon of rotating like a coma with the center part (corresponding to the center of gravity of the container body 4) as a fulcrum may occur, in the container body 4 manufactured according to the first embodiment, the positioning protrusion 13 Since the central portion is the concave portion 14, the concave portion 14 cannot be a fulcrum for rotation, and thus the problem of the rotation phenomenon is also eliminated.
[0063]
  Further, since the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7 is fitted into the fitting recess 11 of the inner container body 6, the inner container body 6 and the outer container body 7 are firmly fixed. Thus, the strength of the container body 4 is excellent.
[0064]
  Since the fitting recess 11 of the inner container body 6 and the peripheral edge 10 of the bottom opening 9 of the outer container body 7 are joined together in a horizontal plane, the inner container body 6 and the outer container body are joined to the bottom 3 of the container body 4. The part where 7 is joined is formed in a ring shape having a predetermined width, and the strength of the bottom 3 of the container body 4 is further increased by this surface joining part.
[0065]
  Further, since the positioning protrusion 13 and the fitting recess 11 of the inner container body 6 are formed by deforming the cylindrical body, the strength is high due to work hardening. The container body 4 is also reinforced by the fitting recess 11 or the like, and the container body 4 having high strength can be obtained also in this respect.
[0066]
  In addition, since the thickness of the inner container body 6 is set to be greater than the thickness of the outer container body 7, the container body 4 that is light and excellent in handleability is manufactured while maintaining the strength of the bottom 3 of the container body 4. Can do.
[0067]
  Further, since the positioning protrusion 13 of the bottom wall 6b of the inner container body 6 protrudes from the bottom opening 9 provided on the bottom wall 7b of the outer container body 7, the manufactured container body 4 is placed on a horizontal plane. In this case, the peripheral edge of the bottom opening 9 does not damage the horizontal surface, and thus the portion on which the container body 4 is placed is prevented from damaging the horizontal electromagnetic cooker. An excellent container body 4 can be manufactured.
  In the first embodiment, the case where the bottom 3 of the container body 4 is formed by the bottom wall 6b of the inner container body 6 has been described. For example, the bottom wall 6b of the inner container body 6 is provided with a bottom opening. A method of forming the bottom 3 of the container body 4 by exposing the bottom wall 7b of the outer container body 7 to the inner surface of the container body 4 from the bottom opening may be adopted.
[0068]
  In the second embodiment, unlike the first embodiment, the upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 are not joined in advance. When the vacuum heat insulating layer 8 is formed between the side walls 7a of the inner container body 7, the upper portion of the side wall 6a of the inner container body 6 and the side wall 7a of the outer container body 7 are joined, and the bottom wall 6b of the inner container body 6 (positioning protrusion) The peripheral edge of the portion 13) and the bottom wall 7b of the outer container body 7 (the peripheral edge portion 10 of the bottom opening 9) are simultaneously joined, thereby having the top opening 1, the side 2 and the bottom 3; 2 is a vacuum heat insulating two-layer structure, and the bottom 3 is for manufacturing a container body 4 having a single layer structure.
[0069]
  In this second embodiment, the upper part of the side wall 6a of the inner container body 6 and the upper part of the side wall 7a of the outer container body 7 are joined by the upper brazing material 21, and the bottom wall 6b of the inner container body 6 and the outer container body 7 are joined. The bottom wall 7b is joined with the lower brazing material 12 in the same manner as in the first embodiment.
[0070]
  As the upper brazing material 21 and the lower brazing material 12, a material that melts at substantially the same temperature is adopted.
[0071]
  The lower brazing material 12 is disposed between the bottom wall 6b of the inner container body 6 and the bottom wall 7b of the outer container body 7 in the same manner as in the first embodiment. On the other hand, the upper brazing material 21 is disposed after providing a structure for disposing the upper brazing material 21 on the upper side wall 7a of the inner container body 6 or on the upper side wall 7a of the outer container body 7.
[0072]
  The structure for disposing the upper brazing material 21 is provided by forming a curling portion 23 for concealing the upper portion of the side wall 7 a of the outer container body 7 on the upper side of the side wall 6 a of the inner container body 6. Therefore, when the inner container body 6 is superposed in the outer container body 7, the curled portion 23 protrudes outward from the outer container body 7, and the lower portion of the curled portion 23 and the side wall 7 a of the outer container body 7 The upper brazing material 21 can be disposed between the two.
[0073]
  Further, the curled portion 23 is C-shaped in cross-sectional view, and the curled portion 23 having the C-shaped cross-sectional view is bent inside the curled portion 23 (may be curved). An attachment portion 24 extending upward is formed along the outer surface of the side wall 7 a of the outer container body 7.
[0074]
  Further, the curl processing portion 23 of the inner container body 6 superposes the inner container body 6 and the outer container body 7 and in the state where the upper brazing material 21 and the lower brazing material 12 are respectively disposed at predetermined positions. It is set so that a gap 27 is formed between the upper inner surface of the curled portion 23 and the upper edge of the outer container body 7.
[0075]
  The curled portion 23 may be formed before or after the inner container body 6 and the outer container body 7 are polymerized.
[0076]
  Hereinafter, a method for joining the inner container body 6 and the outer container body 7 and a method for forming the vacuum heat insulating layer 8 in the second embodiment will be described in detail.
[0077]
  The inner container body 6 and the outer container body 7 are polymerized, and a lower brazing material 12 is introduced from between the peripheral edge of the positioning projection 13 of the inner container body 6 and the edge of the bottom opening 9 of the outer container body 7, The brazing material 12 is disposed in a sandwiched state between the fitting recess 11 of the inner container body 6 and the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7 in the same manner as in the first embodiment.
[0078]
  On the other hand, the upper brazing material 21 is disposed such that the bottom walls 6b and 7b in the superposed state are on the upper side, and in this state, the outer surface of the side wall 7a of the outer container body 7 and the side wall 7a of the outer container body 7 are arranged. This is carried out by placing an upper brazing material 21 between the curled portion 23 projecting from the outer surface (see FIG. 4).
[0079]
  A method of disposing the lower brazing material 12 on the inner container body 6 and the outer container body 7 with the bottom walls 6b and 7b on the upper side in this superposed state may be adopted.
[0080]
  Subsequently, the inner container body 6 and the outer container body 7 with the bottom walls 6b and 7b on the upper side in this polymerization state are introduced into a vacuum heating furnace, and the side walls of the inner container body 6 are the same as in the first embodiment. A vacuum is applied between 6a and the side wall 7a of the outer container body 7, and then the upper brazing material 21 and the lower brazing material 12 are melted.
[0081]
  When the upper brazing material 21 and the lower brazing material 12 are melted, the gap 2 is formed between the upper inner surface of the curled portion 23 and the upper edge of the outer container body 7.7 ExistTherefore, when the lower brazing material 12 is melted, the outer container body 7 can slide down along the attachment portion 24 with respect to the inner container body 6. Therefore, due to the downward sliding of the outer container body 7, the gap between the bottom wall 7 b of the outer container body 7 and the bottom wall 6 ab of the inner container body 6, that is, the peripheral edge portion 10 of the bottom opening 9 of the outer container body 7. And the fitting recess 11 provided at the peripheral edge of the positioning projection 13 of the inner container body 6 are appropriate, and the lower brazing material 12 is properly distributed in the gap. Furthermore, the upper brazing material 21 placed and melted between the outer surface of the side wall 7a of the outer container body 7 and the curled portion 23 by the downward sliding of the outer container body 7 is converted into the curled portion. 23 is pulled in between the attachment portion 24 and the side wall 7a of the outer container body 7, so that the joining by the upper brazing material 21 is also performed well.
[0082]
  After the upper brazing material 21 and the lower brazing material 12 are melted, the melted upper brazing material 21 and lower brazing material 12 are solidified by cooling the inside of the vacuum heating furnace as in the first embodiment. The vacuum heat insulating layer 8 is formed between the side wall 6 a of the inner container body 6 and the side wall 7 a of the outer container body 7.
[0083]
  In the second embodiment, as described above, the inner container body 6 and the outer container body 7 are joined simultaneously with the formation of the vacuum heat insulating layer 8, so that the number of processes is reduced, and the utility body 4 can be easily manufactured. It becomes the manufacturing method of the container body excellent in property.
[0084]
  In addition, since the structure for disposing the upper brazing material 21 is provided only by forming the curled portion 23 in the inner container body 6, the formation of this structure is simple, and in this respect also productivity It will be excellent.
[0085]
  Further, when the upper brazing material 21 and the lower brazing material 12 are melted, the outer container body 7 can slide down with respect to the inner container body 6. The container body 6 and the outer container body 7 can be joined extremely appropriately, and in this respect also, the productivity and strength are excellent.
[0086]
  The rest is the same as in the first embodiment.
[0087]
  The third embodiment is another example of the second embodiment, and a flange portion 26 protruding outward is provided on the upper portion of the side wall 7 a of the outer container body 7, and the flange portion 26 is provided on the inner container body 6. It is covered with a curled portion 23, and an upper brazing material 25 is disposed between the curled portion 23 and the flange 26 inside the curled portion 23 (see FIG. 5).
[0088]
  According to the third embodiment, the curling portion 23 of the inner container body 6 and the side wall 7a of the outer container body 7 are joined to the upper brazing disposed above and below the tip portion of the curling portion 23, respectively. Since it is performed by the materials 21 and 25, the bonding is surely performed and the bonding strength is increased.
[0089]
  Further, since the flange portion 26 provided on the outer container body 7 serves as a receiving portion for the melted upper brazing materials 21 and 25, the upper brazing materials 21 and 25 serve as the curling portion 23 of the inner container body 6 and the outer container. It is effectively used for joining with the side wall 7a of the body 7, so that the joining is surely and firmly performed also in this respect.
[0090]
  Although the drawing shows the case where there is no gap between the upper inner surface of the curled portion 23 and the upper edge of the outer container body 7 (the flange portion 26 in the third embodiment), it is the same as in the second embodiment. Alternatively, a gap may be provided in the part, and the outer container body 7 may be configured to slide down with respect to the inner container body 6 by melting the upper brazing materials 21 and 25 and the lower brazing material 12.
[0091]
  The rest is the same as in the second embodiment.
[Brief description of the drawings]
FIG. 1 is a side sectional view illustrating a first embodiment.
FIG. 2 is an explanatory enlarged side sectional view of the bottom 3 of the container body 4 before being introduced into the vacuum heating furnace of the first embodiment.
FIG. 3 is an explanatory enlarged side sectional view of the bottom 3 of the container body 4 after being introduced into the vacuum heating furnace of the first embodiment.
FIG. 4 is an explanatory enlarged side sectional view of an upper part (portion A in FIG. 1) of the container body 4 of the second embodiment. 4 is upside down with respect to FIG.
FIG. 5 is an explanatory enlarged side sectional view of an upper portion (portion A in FIG. 1) of a container body 4 of a third embodiment. 5 is upside down with respect to FIG.
[Explanation of symbols]
  2 side
  3 Bottom
  4 Container body
  5 lid
  6 inner container
  6a side wall
  6b Bottom wall
  7 Outer container body
  7a side wall
  7b Bottom wall
  8 Vacuum insulation layer
  9 Bottom opening
  10 Perimeter
  11 Mating recess
  12 Brazing material, lower brazing material
  13 Positioning protrusion
  14 Recess
  21 Upper brazing material
  23 Curl processing section
  24 Annex
  25 Upper brazing material
  27  gap

Claims

A method of manufacturing a container body having a side part and a bottom part, the side part adopting a vacuum heat insulation two-layer structure, and the bottom part adopting a single layer structure, comprising a side wall and a bottom wall having a bottom opening. Inside the outer container body with the top opened, an inner container body with a curled portion that conceals the upper part of the side wall of the outer container body at the top and a bottom wall is disposed in a superposed state. Then, a part of the bottom wall of the inner container body is used as the bottom, and a gap is formed between the inner container body and the outer container body between the inner surface of the curled portion and the upper edge of the outer container body. Then, the inner container body and the outer container body are placed in a state where the bottom wall is on the upper side, and the peripheral edge of the bottom opening of the outer container body and the bottom wall of the inner container body A lower brazing material is interposed between the outer surface of the side wall of the outer container body and the curled portion An upper brazing material is disposed in the part, and subsequently, the inner container body and the outer container body in a polymerization state are disposed in a vacuum heating furnace, and the lower brazing material is melted to the inner container body. The outer container body is lowered and slid, and then the lower brazing material and the upper brazing material are solidified to join the upper part of the side wall of the inner container body and the upper part of the side wall of the outer container body and the contents. By joining the bottom wall of the vessel body and the peripheral edge of the bottom opening of the outer container body and vacuum-sealing between the side wall of the inner container body and the side wall of the outer container body, A method for producing a container, comprising forming a vacuum heat insulating layer.

2. The method of manufacturing a container body according to claim 1, wherein a collar portion projecting outward is provided on an upper portion of a side wall of the outer container body, and a curling portion is formed on an upper portion of the side wall of the inner container body. And covering the flange portion with a portion, and then setting the inner container body and the outer container body in a superposed state so that the bottom wall is on the upper side, and the boundary between the outer surface of the side wall of the outer container body and the curled portion The upper brazing material is disposed between the curled portion and the flange portion inside the curled portion, and the inner and outer container bodies in the polymerized state are disposed in the vacuum heating furnace. A manufacturing method of a container body characterized by the above.

The method of manufacturing a container body according to any one of claims 1 and 2, wherein the curled portion 3 formed on the upper portion of the side wall of the inner container body is configured in a C-shape in cross-section, and the C-shape in cross-section. A curled portion that is bent and extended upward at the tip of the curled portion, and is provided with an additional portion that is attached to the outer surface of the side wall of the outer container body. The container body is arranged so that the outer container body can slide up and down with respect to the inner container body, and the vertical sliding of the outer container body is performed in a superposed state guided by the attachment portion. A method for manufacturing a container body, characterized in that it exists.

In the manufacturing method of the container body according to any one of claims 1 to 3 , the diameter of the inner container body with respect to the outer container body protruding from the bottom opening of the bottom wall of the outer container body on the bottom wall of the inner container body A positioning projection for determining the position in the direction is provided, a gap is provided between the outer edge of the positioning projection and the edge of the bottom opening, and the inner container body is disposed in a superposed state inside the outer container body. A protrusion protrudes from the bottom opening to define a part of the bottom wall of the inner container body as the bottom, and then between the upper part of the side part of the inner container body and the upper part of the side part of the outer container body. The upper brazing material is disposed on the outer periphery of the positioning container, and the brazing material is removed from the gap between the outer edge of the positioning protrusion and the edge of the bottom opening, and the peripheral edge of the bottom opening of the outer container body and the bottom of the inner container body. A method for producing a container body, wherein the container body is disposed in a sandwiched state with a wall.

The method for manufacturing a container body according to any one of claims 1 to 4, wherein the upper surface of the peripheral edge of the bottom opening of the outer container body is set to a horizontal plane, and a horizontal plane that is in surface contact with the horizontal plane is provided on the inner container body. A method for producing a container body, comprising: arranging a lower brazing material in a sandwiched state between a horizontal surface of the outer container body and a horizontal surface of the inner container body.

A method of manufacturing a container body having a side portion and a bottom portion, the side portion adopting a vacuum heat insulation two-layer structure, and the bottom portion adopting a single layer structure, which is composed of a side wall and a bottom wall, and is open outside. Inside the container body, an inner container body which is composed of a side wall provided with a curled portion for concealing the upper part of the side wall of the outer container body and a bottom wall having a bottom opening is disposed in a superposed state. Then, a part of the bottom wall of the outer container body is used as the bottom, and a gap is formed between the inner container body and the outer container body between the inner surface of the curled portion and the upper edge of the outer container body. Then , the inner container body and the outer container body are arranged so that the bottom wall is on the upper side, and the peripheral edge of the bottom opening of the inner container body and the bottom wall of the outer container body A lower brazing material is interposed between the outer surface of the side wall of the outer container body and the curled portion An upper brazing material is disposed in the part, and subsequently, the inner container body and the outer container body in a polymerization state are disposed in a vacuum heating furnace, and the lower brazing material is melted to the inner container body. The outer container body is lowered and slid, and then the lower brazing material and the upper brazing material are solidified to join the upper part of the side wall of the inner container body and the upper part of the side wall of the outer container body and By joining the bottom wall of the container body and the peripheral edge of the bottom opening of the inner container body and vacuum-sealing between the side wall of the inner container body and the side wall of the outer container body, A method for producing a container, comprising forming a vacuum heat insulating layer.