JP2012025471A - Paper container for liquid - Google Patents

Abstract

To provide a tube-type liquid paper container having a high use ratio of paper that can be supplied at low cost without using an in-mold injection molding method using an expensive mold.
SOLUTION: A tube-shaped paper container formed by forming a laminate mainly composed of paper, having a barrier layer, and having at least an outermost layer and a thermoplastic resin layer as an innermost layer. The two sides of one blank cut into a rectangular shape are folded and heat-sealed so that the end face of the paper does not touch the contents, and one end of the body barrel is flattened and heat-sealed The bottom seal part is formed, and the other end of the main body part is heat-melted by folding the outer periphery of the donut-shaped top surface part into a bowl-shaped collar part so that the end face of the paper does not touch the contents. It is attached to form a shoulder seal portion, and the flange portion of the plug is thermally fused to the opening portion of the top surface portion to form the plug seal portion.
[Selection] Figure 1

Description

  The present invention includes beverages such as milk, juice, soft drinks, high viscosity foods such as kneaded, kneaded wasabi, mayonnaise, condensed milk, toiletries such as brush, white hair dye, liquid detergents, adhesives, abrasives, etc. The present invention relates to a tube-shaped liquid paper container for storing various liquids.

  As a tube-shaped container for mainly storing high-viscosity liquid materials, a so-called laminated tube using a plastic laminate sheet is generally used instead of a metal tube made by deep drawing a metal plate such as aluminum. in use. As a laminate tube, a gas barrier tube using an aluminum foil or a vapor deposition barrier film has also been proposed in order to prevent the contents from being altered.

  On the other hand, in recent years, from the viewpoint of reducing the burden on the global environment, paper containers using paper, which is a reproducible resource, have attracted attention, and proposals for using paper for tube-shaped containers have also been shown. . The tube container described in Patent Document 1 is a tube container characterized in that the container body is formed of a cylindrical molded body made of a laminated sheet in which front and back surfaces are made of a thermoplastic resin layer and paper is laminated.

  In the tube container described in Patent Document 1, as a method of attaching a plug part to a container body part, a tubular molded body made of a laminated sheet in which paper is laminated is attached to a mandrel in an injection mold, The neck and the frustoconical shoulder that is continuous with the lower end of the mouth and neck are molded by polyethylene resin injection molding, and at the same time, the lower end of the frustoconical shoulder and the upper end of the cylindrical molded body A so-called in-mold injection molding method is used to join the two.

Japanese Patent Application Laid-Open No.7-137753

  The tube container using the conventional in-mold injection molding method has a conspicuous joint between the plug and the body and is excellent in appearance, but requires an expensive dedicated mold. In terms of productivity, it is not satisfactory, and the proportion of plastic in the entire container must be large, so even if paper is used for the body, the meaning of using paper will fade. There was a general problem.

  The problem to be solved by the present invention is to propose a tube-type liquid paper container that can be supplied at a low cost and does not depend on an in-mold injection molding method using an expensive metal mold, and has a high use ratio of paper. That is.

As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a laminated body mainly comprising paper, having a barrier layer, and having a thermoplastic resin layer as at least an outermost layer and an innermost layer is formed. A tube-shaped paper container comprising: a cylindrical main body portion made of the laminate; a donut-like top surface portion made of the laminate; and a flange portion for heat-sealing with the top surface portion It has a cap made of resin and a cap that fits into the cap, and the main body barrel has both ends of one blank cut from the laminated body into a rectangular shape, and the end face of the paper is the contents Folded so as not to contact the heat seal to form a body seal part, one end of the cylindrical body body is flattened and heat sealed to form a bottom seal part The other end of the body barrel is shaped like a donut so that the end face of the paper does not touch the contents. A shoulder seal portion is formed by folding the outer periphery of the top surface portion into a bowl-shaped collar portion and heat-sealing, and a flange portion of the plug is heat-sealed at the opening of the top surface portion. A liquid paper container having a stopper seal portion formed therein.

  The invention according to claim 2 is a tube-shaped paper container formed by molding a laminate mainly composed of paper, having a barrier layer, and having at least an outermost layer and a thermoplastic resin layer as an innermost layer. And a cylindrical main body portion made of the laminate, a synthetic resin plug having a heat fusion portion for heat-sealing the main body portion, and a cap fitted to the plug. The main body barrel is then heat-sealed by folding both side ends of one blank obtained by cutting the laminate into a rectangular shape so that the end face of the paper does not touch the contents, thereby forming a barrel seal portion. One end of the cylindrical body body is flattened and heat-sealed to form a bottom seal part, and the other end of the body body part is the heat-sealed part of the plug. The liquid paper container is characterized in that it is heat-sealed to form a plug seal portion.

  Further, in the invention according to claim 3, the back surface of the both end portions of one blank made of the laminated body is provided with a transparent thermoplastic resin layer on the front and back surfaces of the transparent barrier film. 3. The liquid paper container according to claim 1, wherein the liquid paper container is connected by a tape-shaped connecting member, and the connecting member forms a window portion through which the contents can be visually observed.

  In addition, the invention according to claim 4 is the window member in which the body body has a perforated window hole, and a transparent thermoplastic resin layer is provided on the front and back surfaces of the transparent barrier film from the inside of the window hole. The liquid paper container according to claim 1, wherein a window portion through which the contents can be visually observed is formed by heat sealing.

  The liquid paper container according to the present invention is a tube-shaped paper container mainly made of paper, has a barrier layer, and is formed by molding a laminate having at least an outermost layer and a thermoplastic resin layer as an innermost layer, and has a total weight. It is also possible to use 50% or more of the paper. Therefore, the burden on the global environment is small, and when it is disposed of after use, it is handled as a paper container, which is advantageous in terms of the legal system.

  Since the liquid paper container according to the present invention has a tubular shape, it can be squeezed to squeeze out the contents, and therefore can be used for a wide range of contents from low viscosity liquids to high viscosity liquids. it can.

  In addition, because it uses a laminate with a barrier layer, and the structure is such that the end face of the paper does not come into contact with the content liquid at all, it can be stored for a long time even at room temperature by performing an appropriate sterilization process for filling. It can be.

  Since the shape is a tube shape, it is easier to hold in a hand and is less likely to slip from the hand as compared to a general paperbell-top square paper container. In particular, it is very easy to drink when the mouthpiece is directly put on the mouthpiece.

  In the embodiment described in claim 2, since the plug portion has a heat fusion portion and the main body barrel portion is directly fused to the heat fusion portion of the plug portion, the top surface portion is unnecessary. Become. Since the entire structure is simple, a container having a clean appearance can be obtained.

The body barrel is connected to the back of both ends of one blank made of a laminate by a single tape-like connecting member provided with a transparent thermoplastic resin layer on the front and back of the transparent barrier film, When the connecting member forms a window portion through which the contents can be visually observed, the presence or absence or the remaining amount of the contents can be visually confirmed from the outside of the container.

  The main body has a perforated window hole, and from inside the window hole, a window member provided with a transparent thermoplastic resin layer on the front and back surfaces of the transparent barrier film can be heat-sealed to visually check the contents. Even in the case where a simple window portion is formed, the presence / absence of the contents and the remaining amount can be visually confirmed from the outside in the same manner.

  By making the shape of the cap so that the top of the cap is flat, it is possible to stand the container upside down. The container is easy to use.

FIG. 1 is a schematic view showing an embodiment of a liquid paper container according to the present invention. 2A is a schematic cross-sectional view showing a cross section A-A ′ in FIG. 1, and FIG. 2B is a schematic cross-sectional view showing a cross section B-B ′ in FIG. 1. FIG. 3A is a schematic diagram showing the main body trunk blanks of the liquid paper container shown in FIG. 3 (2) is a perspective view of the body barrel, FIG. 3 (3) is a top surface portion, and FIG. 3 (4) is a perspective view of the plug. FIG. 4 is a schematic view showing another embodiment of the liquid paper container according to the present invention. FIG. 5A is a schematic cross-sectional view showing a C-C ′ cross section of FIG. 4. FIG. 5B is a schematic cross-sectional view showing the D-D ′ cross section of FIG. 4. FIG. 6A is a schematic diagram showing the main body trunk blanks of the liquid paper container shown in FIG. 6 (2) is a perspective view of the body barrel, FIG. 6 (3) is a top surface portion, and FIG. 6 (4) is a perspective view of a plug. FIG. 7 is a schematic view showing another embodiment of the liquid paper container according to the present invention. FIG. 8A is a schematic cross-sectional view showing the E-E ′ cross section of FIG. 7. FIG. 8B is a schematic cross-sectional view showing the F-F ′ cross section of FIG. 7. FIG. 9A is a schematic diagram showing the body trunk blanks of the liquid paper container shown in FIG. FIG. 9 (2) is a perspective view of the main body, and FIG. 9 (3) is a perspective view of the plug. FIG. 10 is a schematic view showing another embodiment of the liquid paper container according to the present invention. FIG. 11A is a schematic cross-sectional view showing the G-G ′ cross section of FIG. 10. FIG. 11B is a schematic cross-sectional view showing the H-H ′ cross section of FIG. 10. FIG. 12 is an explanatory cross-sectional view showing an example of a cross-sectional configuration of a laminate used in the liquid paper container according to the present invention. FIG. 13 is a cross-sectional explanatory view showing an example of the cross-sectional configuration of the connection member and the window member used in the liquid paper container according to the present invention.

The liquid paper container according to the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of a liquid paper container 1 according to the present invention. 2A is a schematic cross-sectional view showing a cross section AA ′ in FIG. 1, and FIG. 2B is a schematic cross-sectional view showing a cross section BB ′ in FIG. 1. 3 (1) is a schematic view showing the main body trunk blanks 16 of the liquid paper container 1 shown in FIG. 1, FIG. 3 (2) is the main body trunk 2, and FIG. FIG. 3 (4) of the surface portion 5 is a perspective view of the plug 7.

  The liquid paper container 1 according to the present invention is a tube-shaped paper container formed by forming a laminate 20 mainly composed of paper, having a barrier layer, and having at least an outermost layer and a thermoplastic resin layer as an innermost layer. In the embodiment shown in FIGS. 1 to 3, the cylindrical main body 2 made of the laminate 20, the donut-like top surface portion 5 made of the laminate 20, and the flange for heat-sealing with the top surface portion 5. It has a synthetic resin plug 7 having a portion 7 a and a cap 8 fitted to the plug 7.

  As shown in FIG. 2 (1), the main body 2 is folded so that both end portions 17a and 17b of one blank 16 obtained by cutting the laminated body 20 into a rectangular shape are not in contact with the contents. The body seal part 11 is formed by heat-sealing, and one end of the cylindrical body body part 2 is flattened and heat-sealed to form the bottom seal part 12. The other end of the paper 2 is heat-sealed by folding the outer periphery of the donut-shaped top surface portion 5 into a bowl-shaped flange portion 5b so that the end surface of the paper does not contact the contents, thereby forming the shoulder seal portion 13 The flange portion 7a of the plug 7 is heat-sealed to the opening 5a of the top surface portion 5 to form a plug seal portion 14.

  The liquid container 1 according to the present invention uses a laminated body mainly composed of paper and having a barrier layer, and has a structure in which the end face of the paper does not come into contact with the contents at all. By performing an appropriate sterilization treatment, a package that can be stored for a long time even at room temperature can be obtained.

  As a procedure for producing the liquid paper container 1 shown in FIG. 1, first, the main body trunk blanks 16 are cut from the laminate 20 and formed into a cylindrical shape, and both side end portions 17a and 17b are bent and heat-sealed. The body seal part 11 is formed to create the cylindrical body part 2.

  On the other hand, the outer periphery of the top surface portion 5 punched out from the laminated body 20 is molded into a dish shape to form the flange portion 5 b, and the plug 7 is attached to the opening portion 5 a of the top surface portion 5. The plug 7 is previously formed by an injection molding method. The flange portion 7a of the plug 7 and the top surface portion 5 are heat-sealed by an ultrasonic sealing method to form the plug seal portion 14. At this time, by attaching the flange portion 7a from the side of the top surface 5 that is the inside of the container, the end surface of the top surface opening 5a becomes the outside of the container, and the end surface of the paper does not contact the contents.

  Next, the top surface portion 5 to which the spigot 7 is heat-sealed is inserted into the main body barrel portion 2, and the end portion of the main body barrel portion 2 is formed so as to wind the flange portion 5 b of the top surface portion 5, and heat-sealed. The shoulder seal portion 13 is formed.

  Finally, the other end portion of the main body barrel 2 is flattened and heat-sealed to form the bottom seal portion 12, whereby the liquid paper container 1 is completed. The bottom seal portion 12 may be simply crushed, but as shown in FIG. 2 (2), by folding back 180 degrees, the appearance of the container and the feel when the container is held in the hand are improved.

  As described above, when creating a container, it can be formed by heat fusion using an ordinary ultrasonic sealing method or the like, and it is not necessary to use a special and expensive mold as in the in-mold forming method. This is the greatest feature of the liquid paper container according to the invention.

FIG. 4 is a schematic view showing another embodiment of the liquid paper container 1 according to the present invention.
FIG. 5A is a schematic cross-sectional view showing the CC ′ cross-section of FIG. FIG. 5B is a schematic cross-sectional view showing a cross section along DD ′ of FIG. 6 (1) is a schematic view showing the main body trunk blank 16 of the liquid paper container 1 shown in FIG. 4, FIG. 6 (2) is the main body trunk 2, and FIG. FIG. 6 (4) of the surface portion 5 is a perspective view of the plug 7.

  In the embodiment shown in FIGS. 4 to 6, the main body body portion 2 is made of a laminate 20, and the back surfaces of both side end portions 17 a and 17 b of one blank 16 are transparent thermoplastic resins on the front and back surfaces of the transparent barrier film. It is connected by one tape-like connecting member 3 provided with a layer, and the connecting member 3 is characterized by forming a window portion 6 through which the contents can be seen.

  In the embodiment shown in FIGS. 4 to 6, the presence / absence of the contents and the remaining amount can be visually confirmed by the transparent window 6. Therefore, it is advantageous in the case of an application in which the contents are not used up at the time of opening, but are used continuously for a certain period after opening.

  As a procedure for producing the liquid paper container 1 shown in FIG. 4, as shown in FIG. 6 (1), the connection member 3 is formed on the back surface of the side end portion 17 a of the main body trunk blank 16 cut out from the laminate 20. Heat seal one side edge. Next, as shown in FIG. 6 (2), the main body trunk blank 16 is rounded and the other side end 17b and the other side end of the connecting member 3 are heat-sealed to form a cylindrical main body trunk. 2 is formed. At this time, both side ends of the connecting member 3 form the body seal part 11, and the center part becomes the window part 6.

  On the other hand, the outer periphery of the top surface portion 5 punched out from the laminated body 20 is molded into a dish shape to form the flange portion 5 b, and the plug 7 is attached to the opening portion 5 a of the top surface portion 5. The flange portion 7a and the top surface portion 5 of the plug 7 are heat-sealed by an ultrasonic sealing method or the like to form the plug seal portion 14.

  Next, the top surface portion 5 to which the spigot 7 is heat-sealed is inserted into the main body barrel portion 2, and the end portion of the main body barrel portion 2 is formed so as to wind the flange portion 5 b of the top surface portion 5, and heat-sealed. The shoulder seal portion 13 is formed.

  Finally, the other end portion of the main body barrel 2 is flattened and heat-sealed to form the bottom seal portion 12, whereby the liquid paper container 1 is completed.

FIG. 7 is a schematic view showing another embodiment of the liquid paper container 1 according to the present invention.
FIG. 8A is a schematic cross-sectional view showing a cross section taken along line EE ′ of FIG. FIG. 8B is a schematic cross-sectional view showing the FF ′ cross section of FIG. 7. 9 (1) is a schematic view showing the main body trunk blanks 16 of the liquid paper container 1 shown in FIG. 7, FIG. 9 (2) is the main body trunk 2, and FIG. 9 (3) is the mouth. It is a perspective view of each of the stoppers 7.

  In the embodiment shown in FIGS. 7 to 9, a synthetic resin plug having a cylindrical main body 2 made of the laminate 20 and a heat-sealing portion 7 b for heat-sealing the main body 2. 7 and a cap 8 that fits into the spigot 7, and the main body body 2 includes both end portions 17 a and 17 b of one blank 16 obtained by cutting the laminated body 20 into a rectangular shape, and the end face of the paper is the content The body seal part 11 is formed by folding and heat-sealing so as not to contact the object, and one end of the cylindrical body body part 2 is flattened and heat-sealed to form the bottom seal part 12. The other end of the main body body 2 is heat-sealed to the heat-sealing portion 7b of the plug 7 to form a plug seal portion 14.

  In this embodiment, the top surface portion does not exist, and one end of the main body trunk portion 2 is directly heat sealed to the heat fusion portion 7 b of the plug 7. For this reason, the structure around the plug is simple and gives a clean appearance.

In the embodiment shown in FIGS. 7 to 9, the main body body 2 further has a perforated window hole 6a, and a transparent thermoplastic resin layer is provided on the front and back surfaces of the transparent barrier film from the inside of the window hole 6a. The window member 4 is heat-sealed to form a window portion 6 through which the contents can be visually observed.
Since the position and shape of the window hole 6a are arbitrary, the position and shape of the window part 6 can also be designed arbitrarily. Moreover, since it can provide in the position which avoided the upper end and lower end of the main body trunk | drum 2, in the process of the edge part of the main body trunk | drum 2, there is an advantage that it does not need special consideration and the sealing property is stabilized.

  7-9, after the window hole 6a is drilled in the main body trunk blanks 16, the window member 4 is heat-sealed in the window hole 6a. Next, the body trunk blanks 16 are formed into a cylindrical shape, and the side end portions 17a and 17b are bent and heat-sealed to form the body seal portion 11 to form the cylindrical body barrel 2.

  A plug 7 is inserted into one end of the cylindrical main body 2, and the heat seal 7 b of the plug and the end of the main body are heat-sealed by ultrasonic welding or the like. The plug seal portion 14 is formed. Finally, the other end portion of the main body barrel 2 is flattened and heat-sealed to form the bottom seal portion 12, whereby the liquid paper container 1 is completed.

  The window member 4 may have the same configuration as the connection member 3. This will be described in detail later.

FIG. 10 is a schematic view showing another embodiment of the liquid paper container 1 according to the present invention.
FIG. 11A is a schematic cross-sectional view showing the cross section GG ′ in FIG. 10, and FIG. 11B is a schematic cross-sectional view showing the cross section HH ′ in FIG. 10.

  Since the embodiment shown in FIGS. 10 to 11 has a configuration in which the window portion 6 is removed from the embodiment shown in FIGS. 7 to 9, detailed description thereof is omitted.

  FIG. 12 is an explanatory cross-sectional view showing an example of a cross-sectional configuration of the laminate 20 used in the liquid paper container 1 according to the present invention. FIG. 13 is an explanatory cross-sectional view showing an example of a cross-sectional configuration of the connection member 3 and the window member 4 used in the liquid paper container 1 according to the present invention.

  In the example of FIG. 12, a surface resin layer 22, which is a thermoplastic resin layer, is provided on the entire surface side of the paper layer 21, and an ink layer 23 by printing is provided on the surface of the surface resin layer 22. The ink layer 23 may be the entire surface or a partial surface depending on the pattern. On the back side of the paper layer 21, a barrier layer 25 is provided over the entire surface via an adhesive layer 24. On the back side of the barrier layer 25, a sealant layer, which is a thermoplastic resin layer, is provided via an adhesive layer 26. Similarly, 27 is provided over the entire surface.

The paper layer 21 can be used a basis weight ^{200g / m 2 ~400g / m 2} , a density 0.6g ^/ cm ³ ~1.1g ^/ cm 3 order of cartons such as a base.

  The surface resin layer 22 is formed by extrusion laminating a heat-melted polyethylene resin on the surface of the paper layer 21. In order to improve the adhesion of the ink layer 23 during printing, the surface of the surface resin layer 22 is preferably subjected to corona treatment.

The barrier layer 25 is selected according to the required degree of gas barrier properties. When high barrier properties are not required, for example, a polyethylene terephthalate (hereinafter abbreviated as PET) resin film alone may be used. Usually, a gas barrier film such as a PET film subjected to alumina vapor deposition, silica vapor deposition, aluminum vapor deposition, or the like is used. The thickness of a vapor deposition layer is 5-100 nm, and the thickness of PET film is 6-25 micrometers. Deposition surface is sealant layer 2
It may be facing the 7 side or the paper layer 21 side. Moreover, the film which dry-laminated aluminum foil and PET film instead of vapor deposition PET film may be sufficient. In this case, the aluminum foil has a thickness of 5 to 15 μm, and the PET film has a thickness of 6 to 25 μm.

  As the sealant layer 27, a single layer or a multilayer film of a thermoplastic resin is used. As a material for the sealant layer 27, a polyolefin resin is generally used. Specifically, a low density polyethylene, a medium density polyethylene, a linear low density polyethylene, an ethylene / vinyl acetate copolymer, an ethylene / α-olefin are used. Copolymers, ethylene resins such as ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers, propylene / α Polypropylene resins such as olefin copolymers are used.

  As the adhesive layer 24 for bonding the paper layer 21 and the barrier layer 25, an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-acrylic acid-acrylic ester terpolymer, ethylene A ternary copolymer of acrylic acid-methacrylic acid ester, a terpolymer of ethylene-methacrylic acid-acrylic acid ester, a terpolymer of ethylene-methacrylic acid-methacrylic acid ester, or the like can be preferably used. In this case, the thickness of the adhesive layer 24 is 10 to 60 μm, and the surface of the paper layer 21 or the barrier layer 25 may be subjected to corona treatment or ozone treatment in order to improve the adhesive strength.

As the adhesive layer 26 for laminating the barrier layer 25 and the sealant layer 27, a known dry laminating adhesive or non-sol laminating adhesive can be used. The coating amount is about 0.5 to 5.0 g / m ² . It can also be bonded by extrusion laminating with polyolefin resin such as polyethylene resin.

  FIG. 13 is a cross-sectional explanatory view showing an example of a cross-sectional configuration of the connection member 3 and the window member 4. As the connection member 3 and the window member 4, those in which a transparent thermoplastic resin layer 29 is provided on the front and back surfaces of the transparent barrier film 28 can be used. As the transparent barrier film 28, alumina vapor deposition or silica vapor deposition PET used for the barrier layer 25 can be used, as well as polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol copolymer film, gas barrier nylon film, gas barrier property. Gas barrier coatings such as gas barrier films such as polyethylene terephthalate films, polyvinylidene chloride coatings, coatings containing water-soluble resins and inorganic layered compounds, and resin layers consisting of coatings obtained by reacting metal alkoxides or their hydrolysates with isocyanate compounds A layered PET film or the like can be used.

  The transparent thermoplastic resin layer 29 needs to be a material that can be thermally fused to both the sealant layer 27 and the surface resin layer 22 of the laminate 20, and the material used for the sealant layer 27 is similarly used. . Specifically, ethylene resins such as low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, ethylene / α olefin copolymer, ethylene-methacrylic acid resin copolymer, etc. Polypropylene resins such as blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymer, propylene / ethylene block copolymer, propylene / α-olefin copolymer, and the like are used.

  As the adhesive layer 26 used for bonding the transparent barrier film 28 and the transparent thermoplastic resin layer 29, the same dry laminate adhesive or nonsol laminate adhesive as the adhesive layer 26 in the laminate 20 may be used. it can.

The connecting member 3 and the window member 4 are usually used by continuously forming an original laminated sheet formed in a wide width into a tape shape by slit processing, and finally cutting to a predetermined length.
Hereinafter, the paper container according to the present invention will be described more specifically based on examples.

A 1-liter tube-shaped liquid paper container having a structure as shown in FIGS.
(Structure of laminate)
Paper layer ··· Resin layer on the surface of a paper pack with a basis weight of 320 g / m ² ··· PE resin, thickness 18 µm
Adhesive layer: EMAA (ethylene methacrylic acid copolymer), thickness 30 μm
Barrier layer ... ・ PET 12μm + silica deposition (thickness 30nm)
Adhesive: Adhesive for dry lamination (urethane), coating amount 3g / m ²
Sealant layer ・ ・ LLDPE, thickness 55μm
(Material of plug) PE resin (Structure of connecting member)
Transparent thermoplastic resin layer: PE resin, thickness 20μm
Adhesives ......... Adhesive barrier layer for dry lamination ......... PET 12μm + silica deposition (thickness 30nm)
Transparent thermoplastic resin layer: PE resin, thickness 20μm
<Comparative example>

A comparative test was conducted using a conventional paper container with the same capacity as a comparative example as a comparative example. The structure of the laminate used is the same as that used in Example 1.
(Evaluation item)
Laminate strength (plug part): Heat-sealing strength between the top part and the plug flange part (N / 15mm)
Laminate strength (connection member): Thermal fusion strength between the body body and the connection member (N / 15 mm)
Drop test: Dropped from a height of 80 cm to check for liquid leakage Transport test: Truck transport test equivalent to 5000 km Ease of holding: Ease of pouring with one hand Ease of pouring with one hand Ease of squeezing : Ease of squeezing the contents

  As shown in Table 1, the paper container according to the present invention is easy to hold, easy to pour, and easy to squeeze, while maintaining the basic performance as a container, as compared with the conventional paperbell type paper container. Etc., and the amount of contents can be confirmed from the window.

DESCRIPTION OF SYMBOLS 1 ... Liquid paper container 2 ... Main body trunk | drum 3 ... Connection member 4 ... Window member 5 ... Top surface part 5a ... Top surface part opening part 5b ... Gutter part 6 ... Window 6a ... Window hole 7 ... Plug 7a ... Flange 7b ... Heat-sealing part 8 ... Cap 11 ... Body seal part 12 ... Bottom seal part 13 ..Shoulder seal part 14 ... plug seal part 16 ... main body trunk blanks 17a, 17b ... main body trunk blank side end 20 ... laminate 21 ... paper layer 22 ... Surface resin layer 23 ... ink layer 24 ... adhesive layer 25 ... barrier layer 26 ... adhesive layer 27 ... sealant layer 28 ... transparent barrier film 29 ... transparent thermoplastic resin layer

Claims (4)

  A tubular paper container made of a paper body, having a barrier layer, and forming a laminated body having at least an outermost layer and a thermoplastic resin layer as an innermost layer, the cylindrical main body cylinder comprising the laminated body A donut-shaped top surface portion made of the laminate, a synthetic resin spigot having a flange portion for heat-sealing with the top surface portion, and a cap fitted to the spigot, The body body is formed by folding the both side ends of one blank obtained by cutting the laminated body into a rectangular shape so that the end surface of the paper does not contact the contents, thereby forming a body seal portion. One end of the cylindrical main body is flattened and heat-sealed to form a bottom seal portion, and the other end of the main body is so that the end face of the paper does not contact the contents. In addition, the outer periphery of the donut-shaped top surface is folded into a bowl-shaped collar and heat-sealed to be shoulder-shouldered. Forms a pole tip, liquid packaging cartons at the opening of the top surface portion, characterized in that the flange portion of the spout is being thermally fused to form a spout seal portion.   A tubular paper container made of a paper body, having a barrier layer, and forming a laminated body having at least an outermost layer and a thermoplastic resin layer as an innermost layer, the cylindrical main body cylinder comprising the laminated body And a synthetic resin spigot having a heat fusion part for heat fusing the main body barrel, and a cap fitted to the spigot. The two side ends of one blank cut into a rectangular shape are folded and heat-sealed so that the end face of the paper is not in contact with the contents to form a body seal portion. One end is flattened and heat-sealed to form a bottom seal portion, and the other end of the main body is heat-sealed to the heat-sealed portion of the plug so that the plug seal portion is A liquid paper container characterized by being formed.   In the main body body, the back surfaces of both end portions of one blank made of the laminate are connected by a single tape-like connecting member in which a transparent thermoplastic resin layer is provided on the front and back surfaces of the transparent barrier film. The liquid paper container according to claim 1, wherein the connecting member forms a window portion through which the contents can be visually observed.   The main body has a perforated window hole, and a window member provided with a transparent thermoplastic resin layer on the front and back surfaces of the transparent barrier film is heat-sealed from the inside of the window hole to visually check the contents. The liquid paper container according to claim 1, wherein a possible window portion is formed.