JP4212911B2

JP4212911B2 - Self-supporting bag

Info

Publication number: JP4212911B2
Application number: JP2003025209A
Authority: JP
Inventors: 真一稲葉; 義則稲川
Original assignee: Kao Corp; Yoshino Kogyosho Co Ltd
Current assignee: Kao Corp; Yoshino Kogyosho Co Ltd
Priority date: 2003-01-31
Filing date: 2003-01-31
Publication date: 2009-01-21
Anticipated expiration: 2023-01-31
Also published as: JP2004231279A

Description

【０００１】
【発明の属する技術分野】
本発明は自立袋に関する。
【０００２】
【従来の技術】
自立袋として、表裏の合成樹脂製胴部シートと、合成樹脂製底部シートを貼合せて可撓袋本体を形成し、更に、この袋本体内に補強用の筒状弾性体を配設し、袋本体の剛性を高め、袋本体のしわの発生を抑えるものがある（特許文献１）。
【０００３】
【特許文献１】
特開平8-244793（［０００９］、図１）
【０００４】
【発明が解決しようとする課題】
従来の自立袋には以下の問題点がある。
(1)袋本体は複数枚のシート（胴部シート、底部シート）を用意してこれを貼合わせることにて製造するものであり、製造工程が複雑である。
【０００５】
(2)胴部シートと底部シートは、貼合わせを可能にするための接着性内側フィルムと、胴部シートの外縁に接する貼合わせ用のヒートシールバーの加熱によっても溶けて汚損しない非接着性外側フィルムとを中間接着層の介在により積層した積層フィルムを用いる。このため、内容剤に界面活性剤や溶剤を含む場合、界面活性剤や溶剤が内側フィルムから中間接着層に浸透して内側フィルムと外側フィルムの剥離を生ずる等、袋品質の安定を損なうおそれがある。
【０００６】
(3)胴部シートと底部シートの貼合わせ交点部が落下の衝撃に対して弱く、割れ易い。
【０００７】
(4)注ぎ口が表裏の胴部シートの平面的な貼合わせ部分に設けられるから、閉塞し易い。閉塞を防ぐためには、表裏の胴部シートの間にストロー等を挟み込む必要がある。
【０００８】
そこで、本出願人は、特願2002-206187により、自立袋において、製造工程を簡易にすること、袋品質の安定を図ること、落下強度を向上すること、注ぎ口を安定確保することを目的とし、胴部と底部からなる合成樹脂製の袋本体を金型成形し、袋本体への内容剤の充填前段階で袋本体を折りたたみ可能にした自立袋を提案している。
【０００９】
しかしながら、金型成形される自立袋では、シートを貼合せた自立袋と異なり、袋本体の各所で肉厚差を生じ、特に袋本体の充填口シール部の近傍に薄肉部を生じ易い。袋本体の薄肉部は剛性が低くなり、内容剤の充填によって屈曲変形して外観を悪くするし、落下等に伴なう衝撃によって破損し易い。
【００１０】
本発明の課題は、金型成形される自立袋において、外観の向上、落下強度の向上を図ることにある。同時に、製造工程の簡易、袋品質の向上、注ぎ口の安定確保も図る。
【００１１】
【課題を解決するための手段】
請求項１の発明は、胴部と底部からなる合成樹脂製の袋本体をブロー成形してなり、袋本体への内容剤の充填前段階で袋本体を折りたたみ可能にした自立袋であって、充填口形成部は袋本体の一方の側面部に連続して袋本体の上縁部に開口を形成し、充填口形成部には充填口シール部が形成され、充填口シール部の近傍の側面部にくぼみ部を形成してなるようにしたものである。
【００１２】
【発明の実施の形態】
（第１実施形態）（図１〜図３）
自立袋１０は、図１に示す如く、胴部２０と底部３０からなる合成樹脂製の袋本体１１を３次元状（立体状）にブロー成形し、袋本体１１への内容剤の充填前段階で袋本体１１の全体を折りたたみ状態にし得るものである。
【００１３】
袋本体１１は、胴部２０と底部３０からなる内容剤の収容部２１と、胴部２０の上縁部の全巾又は全巾近くに渡る広巾の開口を形成し、内容剤のための充填口２２Ａを形成するための充填口形成部２２とを有し、収容部２１と充填口形成部２２とを肩部２３により滑らかにつなぐように、収容部２１、充填口形成部２２及び肩部２３の全体をブロー成形する。肩部２３は、自立袋１０の側面視（充填口形成部２２の後述するシール部２２Ｂの長手方向に沿って見る方向）で、収容部２１の側から充填口形成部２２の側に向けて逆Ｖ字状をなす如くに狭巾化される。
【００１４】
袋本体１１は、胴部２０が正面部２０Ａ、背面部２０Ｂ、両側面部２０Ｃからなるものとし、ブロー成形により、正面部２０Ａと両側面部２０Ｃの境界に稜線部４１を設け、背面部２０Ｂと両側面部２０Ｃの境界に稜線部４２を設け、正面部２０Ａと底部３０の境界に稜線部４３を設け、背面部２０Ｂと底部３０の境界に稜線部４４を設け、両側面部２０Ｃと底部３０の境界に稜線部４５を設ける。また、袋本体１１は、両側面部２０Ｃの長手方向に沿う中央部にブロー成形金型のパーティングラインに沿う稜線部４６を設け、底部３０の中央部にもブロー成形金型のパーティングラインに沿う稜線部４７を設ける。
【００１５】
自立袋１０は、充填口２２Ａから内容剤を充填した後、充填口形成部２２の正面部２０Ａと背面部２０Ｂをシールバーにより挟圧し、正面部２０Ａと背面部２０Ｂをヒートシール又は超音波シール等により融着して封止する。これにより、充填口形成部２２はシール部２２Ｂになる。
【００１６】
自立袋１０は、ブロー成形時に、胴部２０の上縁側の一部に注ぎ口２４Ａを形成するための注ぎ口形成部２４を成形できる。注ぎ口形成部２４の切断により注ぎ口２４Ａを形成する。
【００１７】
自立袋１０は、袋本体１１の全体を例えば以下の如くに折りたたむ（図２）。胴部２０を平らにし、平板状の底部３０の全体を胴部２０の下部に対し折り曲げ、底部３０を胴部２０に対し平行に重ね合せるように折りたたむほぼ平面状の折りたたみ形態。両側面部２０Ｃの稜線部４６を胴部２０の外側に張り出すもの（図２（Ａ））と、胴部２０の内側に折り込むもの（図２（Ｂ））がある。稜線部４６を外側に張り出すようにした自立袋１０の方が折りたたみ状態の全厚が薄くなる。
【００１８】
しかるに、自立袋１０は、ブロー成形された袋本体１１の肉厚を各所で異なるものにし、特に図３（Ａ）に示す如く、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部（換言すれば、胴部２０と充填口シール部２２Ｂの間の肩部２３の反注ぎ口（２４Ａ）側部分）を薄肉部ａとし、シール部２２Ｂの注ぎ口（２４Ａ）側の側傍部を厚肉部ｂとする。
【００１９】
自立袋１０は、薄肉部ａを有することによる外観不良と、落下強度の脆弱化を回避するため、以下の構成を有する。即ち、自立袋１０は、袋本体１１のブロー成形段階で、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部（薄肉部ａ）にくぼみ部５１を形成した（図１、図３（Ｂ））。
【００２０】
くぼみ部５１は、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部の側面部２０Ｃで、両稜線部４１、４２に挟まれ、稜線部４６の上端寄りの中間部を含む領域に設けられ、側面部２０Ｃの他の部分よりもくぼみ状をなす。
【００２１】
ここで、自立袋１０は、ダイレクトブロー成形により製造できる。ダイレクトブロー成形は、パリソンを押出し、パリソンの内部への空気の吹き込みにより円周方向の延伸を行なって袋本体１１を形成する。ダイレクトブロー成形は単層又は積層した樹脂層からなる袋本体１１を形成する。ダイレクトブロー成形による袋本体１１の構成樹脂材料としては、単層のときにはＬＤＰＥ（低密度ポリエチレン）又はＬ−ＬＤＰＥ（直鎖低密度ポリエチレン）を採用でき、積層のときには外側層をＨＤＰＥ（高密度ポリエチレン）、内側層をＬＤＰＥ又はＬ−ＬＤＰＥとするものを採用できる。
【００２２】
自立袋１０は、界面活性剤0.1％〜50％又は溶剤0.1％〜50％の少なくとも１種以上を成分とする内容剤を入れて製品とした自立袋に用いて好適である。
【００２３】
自立袋１０によれば以下の作用がある。
▲１▼袋本体１１のブロー成形段階で、袋本体１１における充填口シール部２２Ｂの近傍（換言すれば、充填口シール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部、又は胴部２０と充填口シール部２２Ｂの間の肩部２３の反注ぎ口（２４Ａ）側部分）の薄肉部ａの少なくとも一部にくぼみ部５１を形成した（図１、図３（Ｂ））。内容剤の充填によって袋本体１１の上述の薄肉部ａに生ずる屈曲変形は、くぼみ部５１の変形により吸収され、くぼみ部５１の周辺にまで無秩序に及ばず、外観の悪化を回避する。
【００２４】
▲２▼落下等に伴なう衝撃はくぼみ部５１の変形により吸収され、袋本体１１の上述の薄肉部ａに破損を生ずることを回避する。
【００２５】
また、自立袋１０は以下の作用もある。
(1)合成樹脂製の可撓袋本体１１を３次元状（立体状）にブロー成形し、袋本体１１への内容剤の充填前段階では袋本体１１を折りたたんで平積み保管でき、内容剤の充填時には袋本体１１を３次元状に膨らませて自立可能にする。袋本体１１は、ブロー成形によって薄肉可撓状にされ、従来のフィルムを貼り合わせた袋に比して使用樹脂量は少なく、平積み保管によって保管効率も良い。
【００２６】
(2)袋本体１１への内容剤の充填口形成部２２は、袋本体１１の胴部２０の上縁の全幅又は全幅近くに渡って設けることができ、内容剤の充填性は良い。
【００２７】
(3)袋本体１１からの内容剤の注ぎ口形成部２４は、袋本体１１のブロー成形時に、胴部２０の一部として成形し、又はブロー成形された胴部２０の上縁の開口部をシールして形成することができる。また、注ぎ口形成部２４は、袋本体１１のブロー成形時に３次元状に成形されるから、閉塞しにくい。
【００２８】
(4)袋本体１１の折りたたみ形態は、胴部２０と底部３０を重ね合わせたほぼ平面状にすることができる。
【００２９】
(5)袋本体１１をブロー成形するものであるから、従来の自立袋で必要なフィルムの裁断やフィルムのシールが大幅に省略可能となるため、製造工程は簡易である。
【００３０】
(6)袋本体１１をシートの貼合わせによって構成するものでないから、接着層を介在させた積層フィルムにより袋本体１１を構成することを必ずしも必要としない。従って、袋本体１１を単層フィルムにより構成することができ、界面活性剤や溶剤を含む内容剤が積層フィルムの接着層に浸透して該積層フィルムの剥離を生ずる等がなく、袋品質の安定を図ることができる。
【００３１】
(7)袋本体１１の胴部２０と底部３０が一体成形され、落下の衝撃に対して強く、割れにくい。
【００３２】
(8)袋本体１１に形成した注ぎ口形成部２４を、袋本体１１の底部３０に平行をなす水平方向に対し0度〜90度、好適には30度〜60度の範囲内、最適には45度で傾けることにより、注ぎ出し易くできる。
【００３３】
(9)袋本体１１に形成した注ぎ口形成部２４を、袋本体１１の外方に突出状にすることを金型設計できることから、その突出形状を自由に構成でき、注ぎ口の突出長を長くしたり、注ぎ口の口幅を広くする等、注ぎ出し易い袋を簡易に製造できる。
【００３４】
（第２実施形態）（図４、図５）
第２実施形態の自立袋１０が第１実施形態の自立袋１０と異なる点は、袋本体１１のブロー成形段階で、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部（薄肉部ａ）に、くぼみ部６２を形成可能にする折り罫線６１を設けた（図４、図５（Ａ））。
【００３５】
折り罫線６１は、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部の側面部２０Ｃで、肩部２３に沿う両稜線部４１、４２からなり、逆Ｖ字状をなす山折り部６１Ａ、６１Ｂと、稜線部４６の上端寄りの中間部から両山折り部６１Ａ、６１Ｂのそれぞれに交わるように延在し、Ｖ字状をなす山折り部６１Ｃ、６１Ｄと、山折り部６１Ａ〜６１Ｄに囲まれる領域内で稜線部４６が形成する谷折り部６１Ｅ、６１Ｆと、山折り部６１Ａと山折り部６１Ｃの交点と谷折り部６１Ｅと谷折り部６１Ｆの交点を結ぶように延在する谷折り部６１Ｇと、山折り部６１Ｂと山折り部６１Ｄの交点と谷折り部６１Ｅと谷折り部６１Ｆの交点を結ぶように延在する谷折り部６１Ｈからなる。
【００３６】
自立袋１０によれば以下の作用がある。
▲１▼袋本体１１のブロー成形段階で、袋本体１１における充填口シール部２２Ｂの近傍（換言すれば、充填口シール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部、又は胴部２０と充填口シール２２Ｂの間の肩部２３の反注ぎ口（２４Ａ）側部分）の薄肉部ａの少なくとも一部にくぼみ部６２を形成可能にする折り罫線６１（６１Ａ〜６１Ｈ）を設けた（図４、図５（Ａ））。内容剤の充填によって、袋本体１１の上述の薄肉部ａに生ずる屈曲変形は、谷折り部６１Ｅ、６１Ｆ、６１Ｇ、６１Ｈが形成するくぼみ部６２（図５（Ｂ））の変形により吸収され、折り罫線６１の周辺にまで無秩序に及ばず、外観の悪化を回避する。
【００３７】
▲２▼落下等に伴なう衝撃は折り罫線６１の変形により吸収され、袋本体１１の上述の薄肉部ａに破損を生ずることを回避する。
【００３８】
（第３実施形態）（図６、図７）
第３実施形態の自立袋１０が第１実施形態の自立袋１０と異なる点は、袋本体１１のブロー成形段階で、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部（薄肉部ａ）に、補強リブ７１を設けた（図６、図７）。
【００３９】
補強リブ７１は、袋本体１１におけるシール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部の側面部２０Ｃで、両稜線部４１、４２に挟まれる領域に設けられ、稜線部４６に交差して水平横方向に延びる複数条の突条リブからなる。
【００４０】
自立袋１０によれば以下の作用がある。
▲１▼袋本体１１のブロー成形段階で、袋本体１１における充填口シール部２２Ｂの近傍（換言すれば、充填口シール部２２Ｂの反注ぎ口（２４Ａ）側の近傍部、又は胴部２０と充填口シール部２２Ｂの間の肩部２３の反注ぎ口（２４Ａ）側部分）の薄肉部ａの少なくとも一部に補強リブ７１を形成した（図６、図７）。袋本体１１の薄肉部ａが補強リブ７１により補強されて剛性を高くするから、内容剤の充填によっても当該薄肉部ａに屈曲変形を生じさせず、外観の悪化を回避する。
【００４１】
▲２▼落下等に伴なう衝撃が上述の薄肉部ａに作用しても、高剛性の補強リブ７１により保護され、当該薄肉部ａに破損を生ずることを回避する。
【００４２】
尚、本発明の自立袋は、金型成形によるものであれば、ブロー成形によるものに限らず、インジェクション成形によるもの等であっても良い。
【００４３】
【発明の効果】
本発明によれば、金型成形される自立袋において、外観の向上、落下強度の向上を図ることができる。同時に、製造工程の簡易、袋品質の向上、注ぎ口の安定確保を図ることもできる。
【図面の簡単な説明】
【図１】図１は第１実施形態の自立袋を示す斜視図である。
【図２】図２は自立袋の折りたたみ状態を示す斜視図である。
【図３】図３は自立袋の薄肉部に形成したくぼみ部を示す模式図である。
【図４】図４は第２実施形態の自立袋を示す斜視図である。
【図５】図５は自立袋の薄肉部に設けた折り罫線を示す模式図である。
【図６】図６は第３実施形態の自立袋を示す斜視図である。
【図７】図７は自立袋の薄肉部に設けた補強リブを示す模式図である。
【符号の説明】
１０自立袋
１１袋本体
２０胴部
２２Ｂ充填口シール部
３０底部
５１くぼみ部
６１折り罫線
６２くぼみ部
７１補強リブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-supporting bag.
[0002]
[Prior art]
As a self-supporting bag, the front and back synthetic resin body sheet and the synthetic resin bottom sheet are laminated to form a flexible bag body, and further, a reinforcing cylindrical elastic body is disposed in the bag body, There is one that increases the rigidity of the bag body and suppresses wrinkling of the bag body (Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-244793 ([0009], FIG. 1)
[0004]
[Problems to be solved by the invention]
Conventional free-standing bags have the following problems.
(1) The bag body is manufactured by preparing a plurality of sheets (body sheet, bottom sheet) and bonding them together, and the manufacturing process is complicated.
[0005]
(2) The body sheet and the bottom sheet are non-adhesive so that they do not melt and become fouled by the heat of the adhesive inner film that enables bonding and the heat seal bar for bonding that contacts the outer edge of the body sheet A laminated film obtained by laminating an outer film with an intermediate adhesive layer is used. For this reason, when a surfactant or solvent is included in the content agent, the surfactant or solvent may penetrate into the intermediate adhesive layer from the inner film and cause peeling of the inner film and the outer film, which may impair the stability of the bag quality. is there.
[0006]
(3) The bonding intersection of the trunk sheet and the bottom sheet is weak against the impact of dropping and easily cracked.
[0007]
(4) Since the spout is provided in the planar laminating portion of the front and back body sheet, it is easy to block. In order to prevent the blockage, it is necessary to sandwich a straw or the like between the front and back body sheets.
[0008]
Therefore, the applicant of the present invention, based on Japanese Patent Application No. 2002-206187, aims to simplify the manufacturing process, to stabilize the quality of the bag, to improve the drop strength, and to ensure a stable spout in a self-supporting bag. And a self-supporting bag in which a bag body made of a synthetic resin composed of a body portion and a bottom portion is molded, and the bag body can be folded before filling the bag body with the content agent.
[0009]
However, in a self-supporting bag that is molded, unlike a self-supporting bag in which a sheet is bonded, a difference in thickness occurs at various locations on the bag main body, and a thin-walled portion tends to occur particularly near the filling port seal portion of the bag main body. The thin-walled portion of the bag body has low rigidity, is bent and deformed by filling the content agent, deteriorates the appearance, and is easily damaged by an impact caused by dropping or the like.
[0010]
An object of the present invention is to improve appearance and drop strength in a self-supporting bag that is molded. At the same time, the manufacturing process will be simplified, the bag quality will be improved, and the spout will be stable.
[0011]
[Means for Solving the Problems]
The invention of claim 1 is a self-supporting bag formed by blow molding a synthetic resin bag body composed of a body part and a bottom part, wherein the bag body can be folded at the stage before filling the contents of the bag body, The filling port forming part forms an opening in the upper edge part of the bag body continuously to one side part of the bag body, the filling port forming part is formed with a filling port seal part, and the side surface in the vicinity of the filling port seal part A hollow portion is formed in the portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment (FIGS. 1 to 3)
As shown in FIG. 1, the self-supporting bag 10 is obtained by blow molding a synthetic resin bag body 11 including a body portion 20 and a bottom portion 30 into a three-dimensional shape (three-dimensional shape), and before filling the bag body 11 with a content agent. Thus, the entire bag body 11 can be folded.
[0013]
The bag body 11 is formed with a container 21 for the contents comprising the body 20 and the bottom 30 and a wide opening over the entire width of the upper edge of the body 20 or near the entire width, and filling for the contents. The container 21, the filling port forming portion 22, and the shoulder portion so as to smoothly connect the housing portion 21 and the filling port forming portion 22 by the shoulder portion 23. 23 is blow molded. The shoulder portion 23 is directed from the housing portion 21 toward the filling port forming portion 22 in a side view of the self-supporting bag 10 (a direction seen along a longitudinal direction of a seal portion 22B described later of the filling port forming portion 22). It is narrowed to form an inverted V shape.
[0014]
The bag body 11 has a body portion 20 consisting of a front surface portion 20A, a back surface portion 20B, and both side surface portions 20C. By blow molding, a ridge line portion 41 is provided at the boundary between the front surface portion 20A and the both side surface portions 20C. A ridge line portion 42 is provided at the boundary of the surface portion 20C, a ridge line portion 43 is provided at the boundary between the front surface portion 20A and the bottom portion 30, a ridge line portion 44 is provided at the boundary between the back surface portion 20B and the bottom portion 30, and the boundary between the both side surface portions 20C and the bottom portion 30 A ridge portion 45 is provided. Further, the bag body 11 is provided with a ridge line part 46 along the parting line of the blow molding die at the center part along the longitudinal direction of the both side surface parts 20C, and the parting line of the blow molding die also at the center part of the bottom part 30. A ridge line portion 47 is provided.
[0015]
After the self-supporting bag 10 is filled with the content agent from the filling port 22A, the front portion 20A and the back portion 20B of the filling port forming portion 22 are clamped by a seal bar, and the front portion 20A and the back portion 20B are heat sealed or ultrasonically sealed. Seal by fusing. Thereby, the filling port forming part 22 becomes the seal part 22B.
[0016]
The self-supporting bag 10 can mold the spout forming part 24 for forming the spout 24A in a part of the upper edge side of the body part 20 at the time of blow molding. The spout 24A is formed by cutting the spout forming part 24.
[0017]
The self-supporting bag 10 folds the entire bag body 11 as follows, for example (FIG. 2). A substantially planar folding form in which the body portion 20 is flattened, the entire flat bottom portion 30 is bent with respect to the lower portion of the body portion 20, and the bottom portion 30 is folded in parallel with the body portion 20. There are those that project the ridge line portions 46 of the side surface portions 20C to the outside of the trunk portion 20 (FIG. 2A) and those that are folded inside the barrel portion 20 (FIG. 2B). The total thickness of the self-standing bag 10 in which the ridge line portion 46 projects outward is thinner.
[0018]
However, the self-supporting bag 10 has different thicknesses of the blow-molded bag body 11 in various places, and as shown in FIG. 3A in particular, the anti-spout (24A) side of the seal portion 22B in the bag body 11 is provided. The vicinity (in other words, the anti-pour spout (24A) side portion of the shoulder 23 between the trunk portion 20 and the filling port seal portion 22B) is a thin portion a, and the pour spout (24A) side of the seal portion 22B Let the side part be the thick part b.
[0019]
The self-supporting bag 10 has the following configuration in order to avoid poor appearance due to having the thin-walled portion a and weakening of the drop strength. That is, the self-supporting bag 10 formed the recessed portion 51 in the vicinity (thin wall portion a) of the bag body 11 on the side opposite to the spout (24A) of the seal portion 22B at the blow molding stage of the bag body 11 (FIG. 1, FIG. 3 (B)).
[0020]
The recessed portion 51 is a side surface portion 20C in the vicinity of the anti-spout port (24A) side of the seal portion 22B in the bag body 11, and is sandwiched between the ridge line portions 41 and 42 and includes an intermediate portion near the upper end of the ridge line portion 46. It is provided in the region, and is more recessed than the other part of the side surface portion 20C.
[0021]
Here, the self-supporting bag 10 can be manufactured by direct blow molding. In the direct blow molding, the bag body 11 is formed by extruding the parison and stretching in the circumferential direction by blowing air into the parison. In the direct blow molding, a bag body 11 made of a single layer or a laminated resin layer is formed. As a constituent resin material of the bag body 11 by direct blow molding, LDPE (low density polyethylene) or L-LDPE (linear low density polyethylene) can be adopted in the case of a single layer, and HDPE (high density polyethylene) is used for the outer layer in the case of lamination. ), The inner layer may be LDPE or L-LDPE.
[0022]
The self-supporting bag 10 is suitable for use as a self-supporting bag having a content agent containing at least one of surfactants 0.1% to 50% or a solvent 0.1% to 50% as a product.
[0023]
The self-supporting bag 10 has the following effects.
(1) At the blow molding stage of the bag body 11, in the vicinity of the filling port seal portion 22B in the bag body 11 (in other words, the vicinity of the anti-spout port (24A) side of the filling port seal portion 22B, or the body portion 20) A recessed portion 51 was formed in at least a part of the thin portion a of the shoulder portion 23 between the filling port seal portion 22B on the side opposite to the pouring spout (24A) (FIGS. 1 and 3B). The bending deformation that occurs in the above-described thin-walled portion a of the bag body 11 due to the filling of the content agent is absorbed by the deformation of the recessed portion 51, does not reach the periphery of the recessed portion 51, and avoids deterioration of the appearance.
[0024]
{Circle around (2)} Impact due to dropping or the like is absorbed by the deformation of the indented portion 51 to avoid the above-mentioned thin portion a of the bag body 11 from being damaged.
[0025]
The self-supporting bag 10 also has the following effects.
(1) The flexible bag body 11 made of synthetic resin is blow-molded into a three-dimensional shape (three-dimensional shape), and the bag body 11 can be folded and stored in a flat state before filling the bag body 11 with the content agent. When filling the bag, the bag body 11 is inflated in a three-dimensional shape so that it can stand on its own. The bag body 11 is thin-walled and flexible by blow molding, uses less resin than a conventional bag on which a film is bonded, and has good storage efficiency due to flat storage.
[0026]
(2) The filling port forming portion 22 of the content agent into the bag body 11 can be provided over the entire width or near the full width of the upper edge of the trunk portion 20 of the bag body 11, and the filling property of the content agent is good.
[0027]
(3) The spout forming part 24 for the content agent from the bag body 11 is formed as a part of the body part 20 at the time of blow molding of the bag body 11, or the opening at the upper edge of the body part 20 that is blow-molded Can be formed by sealing. Moreover, since the spout formation part 24 is shape | molded in three dimensions at the time of blow molding of the bag main body 11, it is hard to block | close.
[0028]
(4) The folding form of the bag body 11 can be a substantially flat shape in which the body 20 and the bottom 30 are overlapped.
[0029]
(5) Since the bag body 11 is blow-molded, the film cutting and film sealing required in the conventional free-standing bag can be largely omitted, and the manufacturing process is simple.
[0030]
(6) Since the bag body 11 is not configured by bonding sheets, it is not always necessary to configure the bag body 11 with a laminated film with an adhesive layer interposed. Therefore, the bag main body 11 can be constituted by a single layer film, and the content agent containing the surfactant and the solvent does not penetrate into the adhesive layer of the laminated film to cause the peeling of the laminated film, thereby stabilizing the bag quality. Can be achieved.
[0031]
(7) The body portion 20 and the bottom portion 30 of the bag body 11 are integrally formed, and are strong against the impact of dropping and are not easily broken.
[0032]
(8) The spout forming part 24 formed on the bag body 11 is optimally in the range of 0 to 90 degrees, preferably 30 to 60 degrees with respect to the horizontal direction parallel to the bottom 30 of the bag body 11. Can be easily poured by tilting at 45 degrees.
[0033]
(9) Since the spout forming part 24 formed on the bag body 11 can be designed as a mold to project outward from the bag body 11, the projecting shape can be freely configured, and the spout length of the spout can be increased. Bags that are easy to pour out can be easily manufactured by elongating or widening the width of the spout.
[0034]
Second Embodiment (FIGS. 4 and 5)
The difference between the self-supporting bag 10 of the second embodiment and the self-supporting bag 10 of the first embodiment is that in the blow molding stage of the bag main body 11, the vicinity of the seal portion 22 </ b> B on the side opposite to the spout (24 </ b> A) ( A fold ruled line 61 is provided in the thin-walled portion a) to enable the formation of the indented portion 62 (FIGS. 4 and 5A).
[0035]
The crease line 61 is a side surface portion 20C in the vicinity of the seal portion 22B on the side opposite to the pouring spout (24A) in the bag body 11, and is composed of both ridge line portions 41 and 42 along the shoulder portion 23, and is an inverted V-shaped mountain. Folding portions 61A and 61B, and mountain fold portions 61C and 61D that extend from the middle portion near the upper end of the ridge line portion 46 so as to intersect with both mountain fold portions 61A and 61B, and have a V shape, and a mountain fold portion The valley folds 61E and 61F formed by the ridge line portion 46 in the region surrounded by 61A to 61D, the intersection of the mountain fold 61A and the mountain fold 61C, and the intersection of the valley fold 61E and the valley fold 61F are connected. It consists of an extended valley fold 61G, and a valley fold 61H extending so as to connect an intersection of the mountain fold 61B and the mountain fold 61D and an intersection of the valley fold 61E and the valley fold 61F.
[0036]
The self-supporting bag 10 has the following effects.
(1) At the blow molding stage of the bag body 11, in the vicinity of the filling port seal portion 22B in the bag body 11 (in other words, the vicinity of the anti-spout port (24A) side of the filling port seal portion 22B, or the body portion 20) Folded crease lines 61 (61A to 61H) that enable the formation of the indented portion 62 are provided in at least a part of the thin portion a of the shoulder portion 23 between the filling port seal 22B on the side opposite to the pouring spout (24A) (see FIG. 4, FIG. 5 (A)). The bending deformation generated in the above-described thin-walled portion a of the bag body 11 due to the filling of the content agent is absorbed by the deformation of the recessed portion 62 (FIG. 5B) formed by the valley fold portions 61E, 61F, 61G, 61H, It does not reach the periphery of the crease line 61, and avoids deterioration of the appearance.
[0037]
{Circle around (2)} Impact due to dropping or the like is absorbed by the deformation of the crease line 61, and the above-mentioned thin portion a of the bag body 11 is prevented from being damaged.
[0038]
(Third Embodiment) (FIGS. 6 and 7)
The self-supporting bag 10 of the third embodiment is different from the self-supporting bag 10 of the first embodiment in the blow molding stage of the bag body 11 in the vicinity of the anti-spout (24A) side of the seal part 22B in the bag body 11 ( Reinforcing ribs 71 are provided in the thin wall portion a) (FIGS. 6 and 7).
[0039]
The reinforcing rib 71 is provided in a region sandwiched between the ridge line portions 41 and 42 at the side surface portion 20C in the vicinity of the anti-pouring spout (24A) side of the seal portion 22B in the bag body 11 and intersects the ridge line portion 46. It consists of a plurality of protruding ribs extending in the horizontal and horizontal directions.
[0040]
The self-supporting bag 10 has the following effects.
(1) At the blow molding stage of the bag body 11, in the vicinity of the filling port seal portion 22B in the bag body 11 (in other words, the vicinity of the anti-spout port (24A) side of the filling port seal portion 22B, or the body portion 20) Reinforcing ribs 71 were formed on at least a part of the thin portion a of the shoulder portion 23 between the filling port seal portion 22B on the side opposite to the pouring spout (24A) (FIGS. 6 and 7). Since the thin-walled portion a of the bag body 11 is reinforced by the reinforcing ribs 71 to increase the rigidity, the thin-walled portion a is not bent and deformed even by filling with the content agent, and deterioration of the appearance is avoided.
[0041]
{Circle around (2)} Even if an impact caused by dropping or the like acts on the above-described thin portion a, it is protected by the high-rigidity reinforcing rib 71 and prevents the thin portion a from being damaged.
[0042]
Note that the self-supporting bag of the present invention is not limited to blow molding, but may be injection molding or the like as long as it is based on mold molding.
[0043]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the self-supporting bag shape | molded by metal mold | die, the improvement of an external appearance and the improvement of drop strength can be aimed at. At the same time, it is possible to simplify the manufacturing process, improve the bag quality, and ensure the stability of the spout.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a self-supporting bag according to a first embodiment.
FIG. 2 is a perspective view showing a folded state of a self-supporting bag.
FIG. 3 is a schematic view showing a recess formed in a thin portion of a self-supporting bag.
FIG. 4 is a perspective view showing a self-supporting bag according to a second embodiment.
FIG. 5 is a schematic diagram showing a crease line provided in a thin portion of a self-supporting bag.
FIG. 6 is a perspective view showing a self-supporting bag according to a third embodiment.
FIG. 7 is a schematic diagram showing reinforcing ribs provided in a thin portion of a self-supporting bag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Self-supporting bag 11 Bag main body 20 The trunk | drum 22B Filling port seal | sticker part 30 Bottom part 51 Indentation part 61 Folding ruled line 62 Indentation part 71 Reinforcement rib

Claims

It is a self-supporting bag that is formed by blow molding a synthetic resin bag body consisting of a trunk and a bottom part, and the bag body can be folded at the stage before filling the contents of the bag body,
The filling port forming part forms an opening in the upper edge part of the bag body continuously to one side part of the bag body,
The filling port forming portion is formed with a filling port seal portion,
A self-supporting bag formed by forming a recessed portion in a side surface portion in the vicinity of a filling port seal portion.

2. The self-supporting according to claim 1, wherein the indented portion is formed of a crease line, and the crease line includes a mountain fold portion that forms an outline of the indented portion, and a valley fold portion formed in a region surrounded by the outline of the indented portion. bag.

The self-supporting bag according to claim 1 or 2, wherein a side surface portion in the vicinity of the filling port seal portion is thinner than other portions.

The self-supporting bag according to any one of claims 1 to 3, wherein a spout forming part is formed on a side opposite to a side part where the filling port forming part is continuous.