JP2016003017A - Paper liquid container with plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper liquid container with a plug, including a trigger to remove the plug from the paper container after use, and easy to remove with a hand.SOLUTION: A paper liquid container with a plug is attached with a plug, and obtained by using paper as a base material layer, box making a blank comprising a laminate sheet obtained by sequentially laminating a heat fusion resin layer/the base material layer/an intermediate layer having gas barrier/a sealant layer, with the sealant layer being the inner surface. The paper liquid container with a plug is such that: the flange part of the plug is sealed to the inner peripheral edge part of a plug fitting hole to form a flange seal part; the flange part 53 comprises a resin composition mixed with polyethylene resin and thermoplastic elastomer; and the shape of the flange seal part 54 is a circular form partially having a projection 60 in the outward direction.

Description

  The present invention relates to a liquid paper container with a stopper used for liquid contents such as fruit juice drinks, alcoholic beverages, seasonings and kitchen detergents. Specifically, the stopper can be easily removed from a used paper container. The present invention relates to a liquid paper container with a stopper.

  Conventionally, liquid paper containers with plugs used for liquid contents of foods and non-foods are widely used in liquid drinks such as fruit juice drinks, tea, coffee, milk drinks, soups, and alcoholic beverages such as sake and shochu. . A gable top shape having a gable roof shape at the top of the paper container is often used. For example, as shown in FIG. 1, the top portion includes a top seal portion 24, a top portion 20, a body portion 30, and a bottom portion 40. What was equipped with the stopper 50 is used.

  Since the liquid paper container is formed by bending a laminated sheet having a paper base layer along a ruled line and heat-sealing it, the outermost layer and the innermost layer of the laminated sheet can be thermally fused. A fusion resin layer is required. As these heat sealing resin layers, polyethylene resins are most commonly used, and among them, low density polyethylene resins and linear low density polyethylene resins are widely used.

  Further, the plug 50 is mainly formed by injection molding of polyethylene resin, and the flange portion of the plug is connected to the innermost layer of the laminated sheet in the plug mounting hole formed at the top of the paper container. Sealed and mounted to form a flange seal. In particular, it is tightly sealed so that the liquid in the contents does not leak.

  In addition, with the enforcement of the Containers and Packaging Recycling Law (formal name: Law Concerning the Collection and Recycling of Containers and Packaging, etc.), recycling of packaging materials and volume reduction during disposal are promoted, and liquid with plugs Paper containers are also being considered.

  The liquid paper container with a spout needs to be disposed of separately because the material of the spout and the paper container is different. At present, in order to remove the spout from the used paper container, when opening and disassembling the paper container, it is made to stab from the opening of the spout, cut, and disassemble along the ruled line. However, it is extremely difficult to cut a hard plug with a pinch, and this method is not suitable for people with weak power. Also, when removing the plug from the paper container, it is difficult to remove the plug because the plug is firmly sealed.

  In order to improve such a problem, there has been proposed a liquid paper container in which the stopper is easily removed from the paper container (Patent Documents 1 and 2).

  Patent Document 1 discloses that an easy peel layer made of a resin composition in which 5 to 50% by weight of a thermoplastic elastomer is blended with polyethylene is used in a liquid paper container with a stopper that is manufactured with the inner layer of the laminated sheet as an inner layer. This is a proposal for a paper container.

  In Patent Document 2, a low crystalline rubber component is blended with a polyolefin resin in either the surface resin layer or the sealant, or in the surface resin layer and the sealant layer, and connected to one end of the hollow tubular portion of the plug. The heat sealing seal part is a liquid paper container with a stopper made of a resin composition in which a low crystalline rubber component is blended with an olefin resin.

However, although the above proposal can make it easier to remove the plug from the paper container, since the flange seal part is formed in a circular shape on the inner peripheral edge of the plug attachment hole, when peeling the flange seal part, There was a problem that the peeling force was dispersed and the flange seal part could not be peeled off smoothly. As shown in FIG. 10, since the flange seal portion 54 is formed in a circular shape, there is a problem that the initial peeling of the flange seal portion cannot be smoothly performed.

JP, 2014-31187, A JP 2012-86857 A

  In view of the problems of the background art as described above, it is an object of the present invention to provide a liquid paper container with a stopper that is provided with a trigger for removing a stopper from a used paper container and can be easily removed by hand. .

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies and completed the present invention.

The invention according to claim 1 of the present invention is a blank comprising a laminated sheet in which paper is a base layer, and a heat-sealing resin layer / base layer / an intermediate layer having a gas barrier property / sealant layer is sequentially laminated. In the liquid paper container with a stopper, which is boxed with the sealant layer as an inner surface and is equipped with a stopper,
The flange portion of the plug is a liquid paper container with a plug in which the flange seal portion is formed by sealing the inner peripheral edge of the plug mounting hole,
The flange portion is made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended,
The flange-sealed liquid paper container is characterized in that the shape of the flange seal portion is a circular shape having a protruding portion in a part of the flange seal portion.

  In the invention according to claim 2 of the present invention, the sealant layer is composed of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated. The liquid paper container with a cap according to claim 1.

The invention according to claim 3 of the present invention is a blank comprising a laminated sheet in which paper is used as a base material layer, and a heat fusion resin layer / a base material layer / an intermediate layer having a gas barrier property / a sealant layer are sequentially laminated. In the liquid paper container with a stopper, which is boxed with the sealant layer as an inner surface and is equipped with a stopper,
The flange portion of the plug is a liquid paper container with a plug in which the flange seal portion is formed by sealing the inner peripheral edge of the plug mounting hole,
The sealant layer is composed of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated,
The flange portion is made of polyethylene resin,
The flange-sealed liquid paper container is characterized in that the shape of the flange seal portion is a circular shape having a protruding portion in a part of the flange seal portion.

The invention according to claim 4 of the present invention is characterized in that a knob is connected to the outer peripheral edge of the flange portion extended from the tip of the projection, and the liquid paper with a stopper according to claim 1 or 3 is provided. It is a container.

  The invention according to claim 5 of the present invention is the liquid paper container with a stopper according to claim 2 or 3, wherein the multilayer film is formed by coextrusion.

  The invention according to claim 6 of the present invention is the liquid paper container with a stopper according to any one of claims 1 to 5, wherein the intermediate layer is a film on which an inorganic oxide is deposited. is there.

  The liquid paper container with a stopper of the present invention can be easily removed from the paper container by hand in the used paper container. Paper containers and spouts can be separated and discarded.

  Further, the flange portion of the plug is made of a resin composition in which polyethylene resin and thermoplastic elastomer are blended, and the shape of the flange seal portion is a circular shape having a protruding portion in a partly outward direction. When the plug is removed, the protrusion becomes a trigger, and the removal force can be removed without being dispersed. The force to peel off at the tip of the protrusion is concentrated, and the flange seal portion can be smoothly peeled off and the plug can be removed.

  According to a second aspect of the present invention, the sealant layer is formed of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated, and The stopper can be easily removed from the paper container, and the used paper container can be opened and disassembled.

  According to a third aspect of the present invention, the sealant layer is made of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated, and the flange portion is made of polyethylene. A flange seal portion is formed by being made of resin and sealed at a peripheral edge portion of the plug attachment hole, and the shape of the flange seal portion is a circular shape having a protruding portion in a part of the outer side. When removing, the protrusion is a trigger, and can be removed without dispersing the peeling force. Even if the flange portion of the plug is made of polyethylene resin, it can be removed. Moreover, the used paper container can be opened and disassembled.

  In addition, since the knob is connected to the outer peripheral edge of the flange extending from the protrusion, the flange can be picked and peeled off smoothly from the tip of the protrusion, and the plug can be removed from the paper container. .

  In addition, since the multilayer film is formed by coextrusion, stable film formation is possible and a sealant layer having easy peel properties can be obtained.

  Further, since the intermediate layer is a film on which an inorganic oxide is deposited, excellent gas barrier properties can be obtained, and foreign matter inspection can be performed using a metal detector.

  The liquid paper container with a stopper of the present invention can be easily removed from the used paper container. In addition, the dismantled paper container and the stopper can be disposed of separately to contribute to recycling.

It is explanatory drawing which shows an example of the liquid paper container with a stopper. It is explanatory drawing which shows an example of the state with which the plug was mounted | worn with the plug mounting hole. It is explanatory drawing which shows an example of the flange part of the stopper seen from the inner side of the paper container. It is explanatory drawing which shows an example of the laminated constitution of a lamination sheet. It is explanatory drawing which shows an example of a layer structure of a sealant layer. An example of the cross section of an easy peel layer is shown. It is explanatory drawing which shows an example of the blank which forms a liquid paper container. It is explanatory drawing which shows an example of the method of opening the paper container after use. It is explanatory drawing which shows an example of the method of removing a stopper from the opened paper container. It is explanatory drawing which shows an example of the flange part of the stopper seen from the inner side of the conventional paper container.

  Hereinafter, an embodiment of the present invention will be described in detail.

  FIG. 1 is an explanatory view showing an example of a liquid paper container with a stopper. FIG. 1 shows a gable top type liquid paper container 80. A quadrangular cylindrical trunk 30 composed of a left side plate, a front plate 32, a right side plate 33, and a back plate, a roof-shaped top portion 20 formed above the trunk portion 30 with an inclined upper surface, and a lower portion of the trunk portion 30 The bottom part 40 is formed. The top 20 is a paper container 80 fitted with a cap 50.

  FIG. 2 is an explanatory diagram illustrating an example of a state where the plug is mounted in the plug mounting hole. In the plug 50, the flange portion 53 and the inner surface of the laminated sheet 1 are sealed on the inner surface of the plug mounting hole 25 by ultrasonic fusion, leaving an unsealed portion on the outer periphery of the flange portion to form a flange seal portion 54. It is installed. The spigot 50 has a pedestal 52 extending from the flange portion 53, and a pedestal barrel portion 51 erected on the inner peripheral upper portion of the pedestal. A cap 59 having a sealing plate portion 57 with a handle 56 that is torn open is screwed to the outer periphery of the extraction barrel portion via a screw portion 58.

  FIG. 3 is an explanatory view showing an example of the flange portion of the spigot as seen from the inside of the paper container. The flange portion 53 and the sealant layer of the paper container are sealed by ultrasonic fusion to form a flange seal portion 54. The inside of the flange seal part is a pedestal 52 and an extraction hole. The shape of the flange seal portion 54 is usually circular because it is sealed at the peripheral edge of the plug mounting hole. The shape of the flange seal portion 54 of the present invention is a circle having a protruding portion 60 in a part of the outer direction. In FIG. 3A, the protrusion 60 shows an example of a triangle. When removing the plug from the paper container, the protrusion 60 becomes a trigger, and the flange sealing portion can be peeled and removed without the peeling force being dispersed. The peeling force can be easily removed by being concentrated on the protrusion 60. FIG. 3-2 shows an example in which a knob 62 is continuously provided on the outer peripheral edge of the flange 53 extending from the protrusion 60. The knob 62 can be picked and peeled off smoothly from the tip of the protrusion, and the plug can be removed from the paper container.

  FIG. 4 is an explanatory diagram illustrating an example of a layer configuration of a laminated sheet. As shown in FIG. 4A, the laminated sheet 1 forming the paper container has paper as a base layer, and in order from the surface, the heat-sealing resin layer 3 / the base layer 4 / the adhesive layer 5 / the intermediate layer. 6 / adhesive layer 7 / sealant layer 8 FIG. 4B illustrates a layer configuration in which the printing layer 2 is formed on the surface of the heat-sealing resin layer 3 as necessary.

  FIG. 5 is an explanatory diagram showing an example of the layer structure of the sealant layer. The sealant layer 8 shown in FIG. 5A is composed of a multilayer film in which a polyethylene resin layer 9 and an easy peel layer 10 made of a resin composition in which a polyethylene resin 10a and a thermoplastic elastomer 10b are blended are laminated. . An example of a two-layer configuration is shown. The sealant layer 8 shown in FIG. 5B is a multilayer film in which a polyethylene resin layer 9, an easy peel layer 10, and an easy peel layer 10 are laminated. An example of a three-layer configuration is shown.

  FIG. 6 shows an example of a cross section of the easy peel layer. The easy peel layer 10 is made of a resin composition in which a polyethylene resin 10a and a thermoplastic elastomer 10b are blended. A thermoplastic elastomer 10b is uniformly blended in the polyethylene resin 10a to develop an easy peel property. By using resins that are not compatible with each other, a sea-island structure is created and easy peel properties are exhibited.

  Next, an example of the manufacturing method of the liquid paper container of this invention is demonstrated.

  FIG. 7 shows an example of a blank for forming the liquid paper container of the present invention. The blank 50 is provided with four rectangular face plates, which are a left side plate 31, a front plate 32, a right side plate 33, and a back plate 34, which form the body portion 30, and are attached to the left edge of the left side plate. 35 are connected.

  Roof plates 21 and 21 are connected to the top portion 20 above the front plate 32 and the back plate 34, respectively. Folded pieces 22 and 22 are formed from the left side plate 31 and the right side plate 33. The length of the folded pieces 22, 22 to the top of the triangle is longer than half of the lateral width of the front plate 32 and the back plate 34, so that when folded, the roof plate does not become flat but has an inclined gable roof shape. Is formed.

  Folding pieces 23, 23, 23, 23 are connected to the two sides of the folding pieces 22, 22, respectively, and the folded pieces 23, 23, 23, 23 are connected to the roof plates 21, 21, respectively. . Further, a top seal portion 24 is formed above the roof plates 21, 21 and the folded pieces 23, 23, 23, 23.

  Further, a plug mounting hole 25 for mounting a plug is formed in the roof plate 21 above the front plate 32.

  The bottom portion 40 below the trunk portion 30 is provided with bottom plates 41 and 41 provided below the front plate 32 and the back plate 34, respectively, and below the left side plate 31 and the right side plate 33, a triangular bottom folding piece 42, 42 are connected to each other.

  The length from the left side plate 31 and the right side plate 33 to the apex of the inverted triangles of the bottom folded pieces 42 and 42 is substantially equal to half of the width of the front plate 32 and the back plate 34, and when the bottom plates 31 and 31 are folded, It is formed so as to be substantially flat.

  Bottom folding pieces 43, 43, 43, 43 are connected to two sides of the bottom folding pieces 42, 42, respectively, and the bottom folding pieces 43, 43, 43, 43 are respectively attached to the bottom plates 41, 41, and affixed. It is connected to the landing plate 35. Further, a bottom seal portion 44 is formed below the bottom plates 41, 41 and the bottom folded pieces 43, 43, 43, 43.

  Next, a method for making a liquid paper container using this blank will be described.

  The front side of the sticking plate 35 is sealed to the back side of the back plate 34 and the top 20 and the bottom 40 positioned above and below the back plate to form a square cylindrical sleeve.

  Next, the bottom is molded. The bottom folded pieces 42, 42 are folded, the bottom folded pieces 43, 43, 43, 43 are folded outward at the boundaries with the bottom folded pieces 42, 42, respectively, and the bottom plate 41, 41 is folded to the bottom folded pieces 43, 43, 43, 43. The bottom surface 41 is opposed to and contacted with the bottom surface of the bottom plates 41 and 41, respectively, and the bottom seal portion 44 is sealed to form the bottom portion 40.

  Next, the stopper 50 is attached to the stopper attachment hole 25 of the rectangular tube-shaped paper container in which the bottom portion 40 is formed, and then the contents are filled, and then the folded pieces 22 and 22 are folded back inwardly. 23, 23, 23, 23 is folded outward, the back surfaces of the folded pieces 23, 23, 23, 23 are brought into contact with the back surfaces of the roof plates 21, 21, respectively, and the top seal portion 24 is sealed, A gable roof-shaped liquid paper container with a cap as shown in FIG. 1 filled with the contents is formed.

  FIG. 8 is an explanatory diagram showing an example of a method for opening a used paper container. The left and right folded pieces 23, 23 above the left side plate 31 or the right side plate 33 of the top seal portion 24 are opened, the surfaces of the laminated sheets are peeled off, and the top seal portion above the left and right folded pieces 23, 23 is further removed. 24 and the upper part of the top seal part 24 above the roof plates 21 and 21 are peeled off. Subsequently, the folded pieces 23 and 23 above the remaining left side plate 31 or right side plate 33 are opened. As a result, as shown in FIG. 8B, the top seal portion opens in an X shape. This state is referred to as primary opening.

  Next, hold it with one hand across the roof plate 21 above the back plate 34 and the upper folded piece 23 above the left side plate 31 corresponding to the upper left of the X shape in FIG. 8-2, and with the other hand the X shape right Holding the roof plate 21 above the lower front plate 32 and the upper turn-up 23 of the right side plate 33, and pulling them to the opposite sides, as shown in FIG. The seal part toward the lower left peels off.

  Further, the upper side of the back plate 34 which is held by one hand with the roof plate 21 above the front plate 32 hitting the lower left of the X shape and the folded piece 23 above the left side plate 31 being held by the other hand, and hitting the upper right of the X shape with the other hand. If the roof plate 21 and the folded piece 23 above the right side plate 33 are sandwiched and pulled, the X-shaped seal portion of the top seal portion 24 from the upper left to the lower right peels as shown in FIG. This state is referred to as secondary opening. Since the secondary opening can be smoothly performed from the primary opening, the top seal portion can be easily opened.

  The paper container with the top seal part opened can be cut open and flattened along the boundary between the face plate and the face plate that form the body part by using the clip. At this time, the stopper can be separated from the paper container by hand.

  FIG. 9 is an explanatory view showing an example of a method for removing a cap (without a cap and a sealing plate) from an opened paper container. In order to remove the spout 50 from the paper container, as shown in FIG. 9A, the thumb 63 is applied to the pouring hole 62, and the tip of the protrusion 60 of the flange seal portion 54 is moved with the index finger 64 from the outside of the flange portion 53. By peeling, the flange seal part 54 can be peeled smoothly. This is a trigger for the protrusion 60 to peel off. FIG. 9-2 shows a state in which the plug 50 is removed from the laminated sheet 1. The stopper and the paper container can be separated.

  The present invention will be described in more detail.

As the substrate layer, paper is used, and the basis weight of the paper is 200 to 500 g / m ² and the density is 0.6 to 1.1 g / cm ³ . A heat-sealing resin layer can be provided on the surface of the base material layer. For example, a polyethylene resin can be extruded and laminated with an extruder. Moreover, you may form a printing layer (picture ink layer) on the surface of a hot-melt resin layer as needed.

In addition, as the intermediate layer having gas barrier properties, an aluminum vapor deposition layer, a film on which an inorganic oxide is vapor deposited, or a film on which an aluminum foil is bonded can be used. Especially, the film which vapor-deposited the inorganic oxide which can perform a foreign material inspection using a metal detector is preferable. Examples of the inorganic oxide include silicon oxide, aluminum oxide, and magnesium oxide. Moreover, as a film, a polyester film can be used from heat resistance, machine appropriateness, a cost aspect, etc. The thickness of the vapor deposition layer is preferably 5 to 100 nm, and the thickness of the polyester film is preferably 6 to 25 μm.

  The base material layer and the intermediate layer can be bonded together via an adhesive layer made of an adhesive resin. For example, from low density polypolyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer (EAA), ionomer, polypropylene, etc. Can be used. These resins can be extruded by an extruder and subjected to sand-poly processing. The thickness of the film is preferably 10 to 60 μm. Moreover, in order to improve adhesive strength, you may perform a corona treatment, ozone treatment, anchor coat application | coating, etc. to the surface of a base material layer. Moreover, either side may be sufficient as the bonding surface of an intermediate | middle layer.

  The sealant layer is a coextruded multilayer film of a polyethylene resin layer and an easy peel layer. The easy peel layer is formed by forming a resin composition in which a thermoplastic elastomer is blended in a polyethylene resin.

As the polyethylene resin layer, resins such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene are used, and among these, linear polyethylene resin is preferable. The linear polyethylene resin preferably has a density of 0.925 g / cm ³ or less and a melt index (MI) (JIS K 7210) of 2 or more. Moreover, the polyethylene resin used for an easy peel layer can be used similarly.

  Examples of the thermoplastic elastomer include polyolefin-based thermoplastic elastomers such as modified ethylene / α-olefin copolymer, polybutene-1, polymethyl-1 pentene, polyhexene 1, polyoctene 1, styrene / isobrene copolymer, styrene.・ Polystyrene thermoplastic elastomers such as isobrene copolymers and hydrogenated products thereof, polyester thermoplastic elastomers, polyurethane thermoplastic elastomers, polyamide thermoplastic elastomers, chlorinated polymer thermoplastic elastomers, fluorine thermoplastic elastomers, Cyclic olefin copolymer (COC), cyclic olefin polymer (COP), etc. can be used. Among these, a modified ethylene / α-olefin copolymer and polybutene 1 are preferable from the viewpoints of film forming properties, seal strength, easy peel properties, and the like.

  Moreover, it is preferable that the mixture ratio of a thermoplastic elastomer is 5 to 50 weight% with respect to a resin composition. If it exceeds 50% by weight, the cohesive force becomes weak and the sealing strength tends to be lowered, which is not preferable. On the other hand, if it is less than 5% by weight, the sealing strength becomes high, a stringing phenomenon occurs at the time of peeling, and stable easy peel properties cannot be obtained. Since the cohesive force varies depending on the blending ratio of the thermoplastic elastomer, and the stability of the easy peel property varies accordingly, the blending ratio is preferably 5 to 50% by weight. If it is this range, it has seal strength and moderate easy peel property, and can be used practically.

  The thickness of the sealant layer is preferably 30 to 100 μm. In order to form the sealant layer, the sealant layer is formed by coextrusion by a T-die method or an inflation method.

The intermediate layer and the sealant layer can be bonded together by, for example, a dry laminating method using a urethane two-component reactive adhesive. The adhesive is preferably applied in an amount of 0.5 to 5.0 g / cm ² . What is necessary is just to confirm and determine adhesive strength suitably. Moreover, it can bond together by sand poly process through polyolefin resin, such as a polyethylene resin. The thickness of the polyethylene film is preferably 15 μm or more.

  As the plug, for example, a polyethylene resin, a polypropylene resin, a polystyrene resin, and other thermoplastic molding resins can be used. A resin composition in which a thermoplastic elastomer is blended with a polyethylene-based resin can also be used. In particular, a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended can be used only in the flange portion. The manufacturing method can be manufactured using an injection molding method, an extrusion molding method, or the like. Moreover, when using the resin composition which mix | blended polyethylene resin and the thermoplastic elastomer in the flange part and shape | molding using a polyethylene resin except a flange part, it is possible by the 2 color molding method, for example.

  Examples of the thermoplastic elastomer include polyolefin-based thermoplastic elastomers such as modified ethylene / α-olefin copolymer, polybutene-1, polymethyl-1 pentene, polyhexene 1, polyoctene 1, styrene / isobrene copolymer, styrene.・ Polystyrene thermoplastic elastomers such as isobrene copolymers and hydrogenated products thereof, polyester thermoplastic elastomers, polyurethane thermoplastic elastomers, polyamide thermoplastic elastomers, chlorinated polymer thermoplastic elastomers, fluorine thermoplastic elastomers, Cyclic olefin copolymer (COC), cyclic olefin polymer (COP), etc. can be used. Among these, polybutene 1 is preferable from the viewpoints of moldability, adhesiveness, easy peel property and the like. Moreover, it is preferable that the mixture ratio of a thermoplastic elastomer is 50 weight% or less with respect to a resin composition.

  Hereinafter, specific examples of the present invention will be described.

A low density polyethylene film 18 μm was extruded and laminated on the surface of a paperboard having a basis weight of 380 g / m ² . Next, a printing layer was formed on the surface of the low density polyethylene film by gravure printing. A paper base sheet was prepared.

  As an intermediate layer, 12 μm of a polyester film on which aluminum oxide was deposited was used. The thickness of the aluminum oxide vapor deposition layer was 30 nm.

As a sealant layer, a linear low density polyethylene resin (MI, 14, density, 0.911 g / cm ³ ) was extruded to form an extruded film of 60 μm.

  Next, the polyester film surface of the intermediate layer and the sealant layer were dry laminated using a two-component curable urethane adhesive to form a laminated film.

  Next, the back surface of the paper base sheet and the vapor deposition surface of the laminated film were bonded to each other by sand poly processing through a low density polyethylene film to prepare a laminated sheet. The thickness of the low density polyethylene film was 30 μm.

  Next, in order to form an 85 square 2000 ml liquid paper container using the above laminated sheet, a blank as shown in FIG. 7 was created, and then a sleeve was assembled, a bottom part was molded, and a plug was attached. Filled with sake and sealed the top seal part to create a liquid paper container with a cap. In addition, the flange part of the stopper is a resin composition in which a polyethylene resin and a polybutene-1 resin are blended so that the polybutene-1 resin is 30% by weight with respect to the resin composition. Then, two-color molding was performed to form a circle. As shown in FIG. 3-1, a flange seal portion is formed by ultrasonically welding the flange portion of the plug to the inner peripheral edge of the plug attachment hole, and the shape of the flange seal portion is partially outward. Triangular protrusions were provided and created.

As a sealant layer, a linear low density polyethylene resin (MI, 14, density, 0.911 g / cm ³ ) as an outer layer, and a linear low density polyethylene resin (MI, 14, density, 0) as an easy peel layer. .911 g / cm ³ ) 70% by weight and a resin composition comprising 30% by weight of polybutene 1 resin were coextruded to form a two-layer film. A layer structure of outer layer 30 μm / easy peel layer (wetted layer) was formed. Other than that was carried out similarly to Example 1, and created the liquid paper container with a stopper.

  A liquid paper container with a stopper was prepared in the same manner as in Example 2 except that the flange portion of the stopper was made of polyethylene resin.

  As shown in FIG. 3-2, the shape of the flange portion of the spigot is the same as that of Example 2 except that a knob portion is continuously formed on the outer peripheral edge of the flange portion extended from the protruding portion. A liquid paper container was created.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A liquid paper container with a stopper was prepared in the same manner as in Example 1 except that the shape of the flange seal portion was circular.

<Comparative Example 2>
A liquid paper container with a stopper was prepared in the same manner as in Example 2 except that the shape of the flange seal portion was circular.

<Comparative Example 3>
A liquid paper container with a stopper was prepared in the same manner as in Example 1 except that the flange portion was made of polyethylene resin.

<Evaluation method>
The prepared liquid paper container with a stopper was evaluated by the following method.

<Removability>
When peeling the flange seal part, it was marked with ○ for easy removal, Δ for difficult to remove, and x for non-removable.

<Adhesive strength>
Adhesive strength {N / 15 mm} was measured with a tensile tester (tensile speed 300 mm / min).

<Evaluation of peeling surface>
Evaluation of peeled surface after opening strength evaluation.

<Drop strength>
Drop the plug from the height of 80 cm facing down.

  Table 1 shows the evaluation results.

フランジ部にポリエチレン樹脂と熱可塑性エラストマーとが配合された樹脂組成物を用いる、またはシーラント層にイージーピール層を積層した多層フィルムを用いる、かつフランジシール部の形状が、一部に外方向に三角形の突起部を有した円形であることにより、紙容器から口栓を容易に取り外せることが判った。紙容器と口栓を容易に分別することができる。

Use a resin composition in which polyethylene resin and thermoplastic elastomer are blended in the flange part, or use a multilayer film in which an easy peel layer is laminated on the sealant layer, and the flange seal part is partially triangular outward It was found that the spout can be easily removed from the paper container by the circular shape having the protrusions. Paper containers and plugs can be easily separated.

  The liquid paper container with a stopper of the present invention can be easily removed from the used paper container. It can be used in liquid paper containers with stoppers that store liquid contents such as sake, wine, shochu, plum wine and other liquors, fruit juice drinks, sauces, and kitchen detergent.

1: Laminated sheet 2: Printed layer 3: Heat-sealed resin layer (polyethylene layer)
4: Base material layer (paperboard)
5: Adhesive layer (polyethylene layer)
6: Intermediate layer (gas barrier layer)
7: Adhesive layer 8: Sealant layer 9: Polyethylene resin layer 10: Easy peel layer 10a: Polyethylene resin 10b: Thermoplastic elastomer 20: Top part 21: Roof plate 22: Folding piece 23: Folding piece 24: Top seal part 25: Mouthpiece mounting hole 30: trunk 31: left side plate 32: front plate 33: right side plate 34: back plate 35: sticking plate 40: bottom 41: bottom plate 42: bottom folded piece 43: bottom folded piece 44: bottom seal portion 50: Plug 51: Pouring barrel 52: Base 53: Flange 54: Flange seal 55: Score 56: Handle 57: Sealing plate 58: Screw 59: Cap 60: Projection 61: Knob 62 : Outlet 63: Thumb 64: Index finger 70: Blank 80: Liquid paper container with plug

Claims (6)

A blank made of a laminated sheet in which paper is used as a base material layer, and a heat-sealing resin layer / base material layer / intermediate layer having a gas barrier property / sealant layer is sequentially laminated, with the sealant layer as an inner surface. In a liquid paper container with a spigot equipped with a spigot,
The flange portion of the plug is a liquid paper container with a plug in which the flange seal portion is formed by sealing the inner peripheral edge of the plug mounting hole,
The flange portion is made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended,
A liquid paper container with a cap, characterized in that the flange seal portion is circular in shape with a protruding portion in part in the outward direction.   2. The mouth according to claim 1, wherein the sealant layer is composed of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated. Liquid paper container with stopper. A blank made of a laminated sheet in which paper is used as a base material layer, and a heat-sealing resin layer / base material layer / intermediate layer having a gas barrier property / sealant layer is sequentially laminated, with the sealant layer as an inner surface. In a liquid paper container with a spigot equipped with a spigot,
The flange portion of the plug is a liquid paper container with a plug in which the flange seal portion is formed by sealing the inner peripheral edge of the plug mounting hole,
The sealant layer is composed of a multilayer film in which a polyethylene resin layer and an easy peel layer made of a resin composition in which a polyethylene resin and a thermoplastic elastomer are blended are laminated,
The flange portion is made of polyethylene resin,
A liquid paper container with a cap, characterized in that the flange seal portion is circular in shape with a protruding portion in part in the outward direction.   The liquid paper container with a cap according to claim 1 or 3, wherein a knob is connected to the outer peripheral edge of the flange extending from the tip of the protrusion.   4. The liquid paper container with a cap according to claim 2, wherein the multilayer film is formed by coextrusion.   The said intermediate | middle layer is a film which vapor-deposited the inorganic oxide, The liquid paper container with a stopper of any one of Claims 1-5 characterized by the above-mentioned.

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