JP6428159B2 - Liquid paper container - Google Patents

Description

  The present invention relates to a liquid paper container.

  Liquid paper containers used for liquid contents of foods and non-foods are widely used for liquid drinks such as fruit juice drinks, juices, teas, coffees, milk drinks, soups, and alcoholic beverages such as sake and shochu. This liquid paper container is made of a laminated material in which a sealant layer made of a thermoplastic resin is provided on the inner surface of the paper layer. Between the paper layer and the sealant layer, an aluminum foil, an aluminum vapor-deposited film, or an inorganic oxide vapor-deposited film is used. There is one provided with a layer having a barrier property (for example, Patent Document 1).

  In recent years, separation of empty containers after use and volume reduction of waste have been performed due to environmental conservation problems, and empty containers have been dismantled at the time of disposal. In addition, there is a gable roof-shaped roof plate with a plug, but the plug is firmly welded. To separate this plug for disposal, open the top seal. However, it was difficult to separate it by cutting around the plug with scissors.

  However, since the above-described conventional liquid paper container is firmly sealed by heat-sealing the top seal portion, when disassembling the empty container after use, the top seal portion is opened by hand and the container is disassembled. It was difficult to do.

  This is because the top seal portion of the liquid paper container seals in a state where the folded laminate is in contact with it, so that a gap is likely to occur. Therefore, the sealant layer on the back surface of the liquid paper container has a good fluidity when melted. Resin is used and sealed at high temperature and strong pressure to fill the gap and complete sealing.

  This is because the sealing strength is increased. If the sealing temperature is lowered or the pressure is weakened in order to weaken the sealing strength, there is a risk that sealing will be incomplete and liquid leakage will occur.

  Therefore, it is recommended not to open the top seal part, but to cut the empty container by cutting with a scissor from the opening of the plug, but it is extremely difficult to cut a hard plug with scissors. Yes, not in the general situation.

  As an improvement, there is a liquid paper container that can be easily disassembled by cutting through the side plate of the body portion.

  For example, both ends of a composite sheet provided with a synthetic resin layer on the front and back of the paper layer are overlapped with each other, and a pull tab is provided at the end of the composite sheet on the outer surface side where the sealed body part is overlapped. In addition, there is a liquid paper container in which the pull tab is provided so as to be peelable through a peelable layer made of an easily peelable tape-like film (Patent Document 2).

  The tape-like film is continuously provided along the inner surfaces of the four side plates, and cut lines, half-cuts, sewing machines are formed in the paper layer of the composite sheet along both widthwise edges of the tape-like film. Cut lines such as eyes are engraved.

  Known documents are shown below.

JP 2003-335362 A JP-A-9-290822

  However, in the liquid paper container of Patent Document 2, an easily peelable tape-like film is required, and there is a possibility that the seal at the body part bonding portion may become unstable due to the easily peelable tape-like film. Further improvements are desired.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a liquid paper container that can be easily disassembled, has a stable sealing property, and is not easily broken.

The present invention has been made to solve the above problems, and the invention of claim 1 of the present invention includes a thermoplastic resin layer, a paper substrate, an adhesive resin layer, a barrier layer, from the outer layer side toward the inner layer side. The sealant layer is composed of a laminated body sequentially laminated, and is a liquid paper container composed of a cylindrical body portion, a top portion that closes an upper end of the body portion, and a bottom portion that closes a lower end of the body portion,
Scratch processing A is applied to the paper base material or from the thermoplastic resin layer to the paper base material, and scratch processing B is applied from the barrier layer to the sealant layer. Is provided at substantially the same position as the position of the laminate provided with the scratch processing A,
In addition, both the scratch processing A and the scratch processing B are liquid paper containers characterized by not penetrating the adhesive resin layer .

The invention according to claim 2 of the present invention is the liquid paper container according to claim 1, wherein the scratch processing A is performed so as to make one round of the trunk portion or the top portion .

  The liquid paper container of the present invention is subjected to scratch processing A on the paper base material or from the thermoplastic resin layer to the paper base material, and scratch processing B is applied to the base film of the barrier layer. Since the processing B is provided at substantially the same position as the position of the laminate on which the scratch processing A is provided, the processing B can be easily broken and disassembled from the scratch processing A portion, and the sealing performance is also stable. And hard to break.

It is explanatory drawing which showed the laminated body used for an example of the liquid paper container of this invention typically by the cross section. It is explanatory drawing which showed typically the cross-section of the other example of the laminated body used for an example of the liquid paper container of this invention. (A) It is explanatory drawing which showed typically an example of the liquid paper container of this invention by the perspective view. (B) It is explanatory drawing which showed typically the other example of the liquid paper container of this invention by the perspective view. It is explanatory drawing which showed typically the blank of an example of the liquid paper container of this invention. It is explanatory drawing which showed typically the position of the flaw processing provided in the trunk | drum with the blank of an example of the liquid paper container of this invention. (A) is the position of the scratch processing A performed from the paper base material or the thermoplastic resin layer to the paper base material. (B) is the position of the flaw processing B applied from the barrier layer to the sealant layer. (C) is a position of another example of the scratch B applied from the barrier layer to the sealant layer. It is explanatory drawing which showed typically the position of the flaw processing provided in the top part with the blank of an example of the liquid paper container of this invention. (A) is the position of the scratch processing A performed from the paper base material or the thermoplastic resin layer to the paper base material. (B) is the position of the flaw processing B applied from the barrier layer to the sealant layer. (A)-(e) It is explanatory drawing which illustrated the shape of the flaw processing provided in an example of the liquid paper container of this invention. (A) (b) It is a schematic diagram explaining the method of cutting | disconnection and dismantling when flaw processing is provided in the trunk | drum in an example of the liquid paper container of this invention. (A) (b) It is a schematic diagram explaining the cutting / disassembling method when flaw processing is provided on the top in an example of the liquid paper container of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing a cross section of a laminate used in an example of a liquid paper container of the present invention, and FIG. 2 is a schematic view of another example of a laminate used in an example of a liquid paper container of the present invention. FIG. 3A is an explanatory view schematically showing an example of the liquid paper container of the present invention in a perspective view. (B) is explanatory drawing which showed typically the other example of the liquid paper container of this invention by the perspective view.

  As shown in FIG. 1, the laminate 101a used in the liquid paper container 100 of this example is composed of a thermoplastic resin layer 1, a paper substrate 2, an adhesive resin layer 3, from the outer layer side to the inner layer side of the liquid paper container 100. The barrier layer 4, the adhesive layer 5, and the sealant layer 6 are sequentially laminated. Moreover, you may provide a printing layer in the outer surface of the thermoplastic resin layer 1 as needed.

  Then, the paper substrate 2 is subjected to scratch processing A, and the scratch processing B is performed from the barrier layer 4 to the sealant layer 6, and the scratch processing B is the position of the laminate on which the scratch processing A is provided. They are provided at substantially the same position.

  Further, the scratch processing A may be performed not only on the paper base 2 but also on the thermoplastic resin layer 1 and the paper base 2 as in the laminate 101b of FIG. . The scratch processing A may be provided halfway through the paper base material 2 without completely cutting the paper base material 2. Further, the flaw processing B may be provided up to the middle of the adhesive resin layer 3.

  The resin used for the outer layer side thermoplastic resin layer 1 constituting the laminate 101a and the laminate 101b used in the liquid paper container 100 of the present example is thermoplastic such as low density polyethylene resin or linear low density polyethylene resin. Resins can be preferably used.

  Using this thermoplastic resin, it can be provided on the outer surface of the paper substrate 2 by extrusion lamination. Although not shown, a printing layer can be provided on the outer surface of the thermoplastic resin layer 1. A printing layer is a layer containing a pattern, product information, etc. given by methods, such as gravure printing and offset printing, using well-known ink. It is preferable to perform easy adhesion treatment such as corona treatment to enhance adhesion with the printed layer. An overcoat layer may be provided on the printed layer to improve wear resistance.

As the paper base 2, a paperboard such as milk carton base paper is usually used. The basis weight and density are appropriately selected depending on the capacity and design of the container. Usually, paper having a basis weight of 200 to 500 g / m ² and a density of 0.6 to 1.1 g / cm ³ is preferably used. If the capacity of the liquid paper container is 1 liter or 2 liters, paper having a basis weight of 300 to 400 g / m ² is preferably used.

  The adhesive resin layer 3 is a layer made of a polyolefin resin used for sandwich lamination for bonding the paper substrate 2 and the barrier layer 4. The thickness is usually in the range of 10 μm to 60 μm. If it is less than 10 μm, sufficient adhesive strength cannot be obtained. If it is too thick, the processing speed becomes slow due to the extrusion speed of the extruder, which is not efficient.

  Specifically, ethylene-based resins such as low-density polyethylene and linear low-density polyethylene, polypropylene, and ethylene / α, β-unsaturated carboxylic acids such as ethylene / acrylic acid copolymers and ethylene / methacrylic acid copolymers. Acid copolymers, esterified products of ethylene / α, β unsaturated carboxylic acid copolymers such as ethylene / methyl acrylate, ethylene / ethyl acrylate, ethylene / methyl methacrylate, ethylene / ethyl methacrylate, Ionic cross-linked products of ethylene / α, β unsaturated carboxylic acid copolymer cross-linked with sodium ion or zinc ion, such as ethylene / maleic anhydride graft copolymer or ethylene / ethyl acrylate / maleic anhydride Anhydride-modified polyolefins such as terpolymers, ethylene glycy Epoxy compound-modified polyolefins, such as methacrylate copolymers, single resin selected from ethylene-vinyl acetate copolymer, or provided by such a mixture of two or more selected from these. Moreover, it is good also as the multilayer adhesive resin layer 3 combining these resin.

  In order to increase the adhesive strength with the adhesive resin layer 3, the surface of the paper substrate 2 can be subjected to easy adhesion treatment such as flame treatment, corona treatment, ozone treatment, and anchor coating.

  For the barrier layer 4, a biaxially stretched film of polyethylene terephthalate or nylon, or a laminated film combining these is preferably used. Moreover, the vapor deposition film which provided vapor deposition layers, such as metals, such as aluminum and tin, and metal oxides, such as a silica and an alumina, in the said biaxially stretched film can be used. The thickness of the metal oxide deposition layer is preferably 5 to 100 nm. Moreover, you may use the laminated | multilayer film which laminated | stacked metal foil, such as aluminum foil, on the said biaxially stretched film. The thickness of the metal foil is preferably 5 to 15 μm.

  Alternatively, a biaxially stretched film coated with a resin having a high barrier property such as polyvinylidene chloride may be used. Furthermore, a biaxially stretched film such as ethylene vinyl alcohol copolymer or MXD nylon obtained by polymerizing metaxylylenediamine and adipic acid, which has a high barrier property of the resin itself, can also be used. The thickness of the film used for the barrier layer 4 is preferably 6 to 25 μm.

  In order to increase the adhesive strength, the surface of the barrier layer 4 can be subjected to easy adhesion treatment such as corona treatment, ozone treatment, and anchor coating.

The adhesive layer 5 may be an extruded resin layer or a laminating adhesive. As the resin used for the extruded resin layer, a thermoplastic resin such as a polyethylene resin can be used as in the case of the adhesive resin layer 3. The thickness is usually in the range of 5 μm to 20 μm. In addition, as a laminating adhesive, a urethane two-component curable dry laminating adhesive (including a solvent-free adhesive) can be used. The dry coating amount is preferably 0.5 to 7.0 g / m ³ . Since the adhesive layer 5 is exposed to the inner surface side by the scratch processing B, it is more preferable that the adhesive layer 5 is formed of an extruded resin.

  For the sealant layer 6, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, or the like can be used. There may also be a layer partially containing polybutene. In particular, linear low density polyethylene can be preferably used. Further, in order to facilitate the opening of the seal portion, a blend resin of a polyethylene resin such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene and a thermoplastic elastomer may be used. Cyclic olefin resins may be used for the purpose of low adsorption of contents and low elution of adhesive components.

  As the linear low density polyethylene to be used, those having a density of 0.925 or less and MI of 4 or more are preferably used. The thickness of the sealant layer 6 is preferably 30 to 100 μm, and an unstretched film formed by a T-die method or an inflation method is preferably used.

  As described above, the laminated body 101a and the laminated body 101b used in the liquid paper container 100 of the present example have been described. However, in consideration of the use as the liquid paper container, the purpose of improving the rigidity and durability required as the liquid paper container, etc. Thus, another layer may be interposed in the above layer configuration.

  As shown in FIG. 3A, the liquid paper container 100 of the present example includes a barrel portion 20 that is formed into a cylindrical shape by providing a barrel bonding portion, a top portion 10 that closes the upper end of the barrel portion, and the barrel portion. A liquid paper container having a bottom portion 30 that closes the lower end, and a top portion is a liquid paper container 100 of a govel top type (roof type).

  Further, the liquid paper container of the present invention may be a liquid paper container 200 in which the front part of the top part 10 is an inclined part and the rear part is flat as shown in FIG. Further, although not shown in the drawing, the liquid paper container is a brick type (brick type) with a flat top, or a liquid paper container with a top member or a bottom member provided on the top or bottom and an annular leg or the like. May be. Further, it may be a liquid paper container with a stopper provided with a stopper 15 on the top portion 10.

  Scratch processing A is applied to the paper substrate 2 or from the thermoplastic resin layer 1 to the paper substrate 2, and scratch processing B is applied from the barrier layer 4 to the sealant layer 6. The flaw processing B is provided at a position substantially the same as the position of the laminated body provided with the flaw processing A of the laminated body 101a or the laminated body 101b.

  The flaw processing A applied to the paper base material 2 or from the thermoplastic resin layer 1 to the paper base material 2 is provided by punching or half punching using a blade die. Further, the flaw processing B applied from the barrier layer 4 to the sealant layer 6 is also provided by punching or half punching using a blade die. The scratch processing applied to the thermoplastic resin layer 1 and the sealant layer 6 may be closed by heating after processing.

  FIG. 4 is an explanatory diagram schematically showing a blank of an example of the liquid paper container of the present invention, and FIG. 5 is a schematic view of the position of scratch processing provided on the body portion of the blank of an example of the liquid paper container of the present invention. (A) is the position of the scratch processing A applied from the paper base material or the thermoplastic resin layer to the paper base material, and (b) is from the barrier layer to the sealant layer. (C) is a position of another example of the scratching B applied from the barrier layer to the sealant layer, and FIG. 6 is a blank of an example of the liquid paper container of the present invention. (A) is the position of the scratch processing A applied across the paper base material or the thermoplastic resin layer from the paper base material. (B) is the position of the scratched B applied from the barrier layer to the sealant layer, and FIGS. 7 (a) to (e) are the liquids of the present invention. Is an explanatory view illustrating the shape of the wound process provided in one example of the paper vessels.

  In the liquid paper container 100 of this example, a laminated body used in the liquid paper container of the present invention such as the laminated body 101a or the laminated body 101b is punched at the same time as pressing a crease indicated by a one-dot chain line, and is punched as shown in FIG. In addition, a blank 102 for the liquid paper container 100 of this example is created. The blank paper 102 is bent along a crease, assembled, and necessary portions are heated and fused, whereby the liquid paper container 100 of this example is manufactured.

  As shown in FIG. 4, the blank 102 of the liquid paper container 100 is provided with four rectangular face plates, which are a left side plate 21, a front plate 22, a right side plate 23, and a back plate 24, which form the body portion 20. A sticking plate 25 is provided on the left edge of the left side plate 21. The sticking plate 25 extends to the top 10 and the bottom 30 respectively.

  A rectangular roof plate 11, 11 is connected to the top portion 10 above the trunk portion 20 above the front plate 22 and the back plate 24, respectively. A plug hole 16 is provided in communication with the plug 15 for pouring out the contents.

  Above the left side plate 21 and the right side plate 23, triangular folding pieces 12, 12 are connected in series. The length from the left side plate 21 and the right side plate 23 to the triangle apex of the folded pieces 12 and 12 is longer than half of the width of the front plate 22 and the back plate 24, and the roof plates 11 and 11 are flat when folded. Instead, it is formed to be an inclined gable roof.

  Folding pieces 13, 13, 13, 13 are connected to two sides on the triangular folding pieces 12, 12, and the folding pieces 13, 13, 13, 13 are respectively attached to the roof plates 11, 11. To connect to. Further, a top seal portion 14 is provided above the roof plates 11, 11 and the folded pieces 13, 13, 13, 13.

  The height of the top seal portion 14 above the roof plates 11 and 11 is formed higher than the height of the top seal portion 14 above the folded pieces 13, 13, 13 and 13, and the higher portion when the box is made. Then, the top seal portions 14 above the roof plates 11 and 11 are directly sealed.

  The bottom portion 30 below the trunk portion 20 has a shape similar to that of the top portion 10, and bottom plates 31 and 31 are provided below the front plate 22 and the back plate 24, respectively, and the left side plate 21 and the right side plate 23. The triangular bottom folding pieces 32 and 32 are connected to each other downward with the apex of the triangle facing downward.

  The length from the left side plate 21 and the right side plate 23 to the apex of the inverted triangles of the bottom folded pieces 32 and 32 is substantially equal to half of the width of the front plate 22 and the back plate 24, and the bottom plates 31 and 31 when folded. Is formed to be substantially flat.

  Bottom folding pieces 33, 33, 33, 33 are connected to two lower sides of the triangular bottom folding pieces 32, 32, and the bottom folding pieces 33, 33, 33, 33 are respectively connected to the bottom plate 31. 31 or the sticking plate 25. Further, a bottom seal portion 34 is provided below the bottom plates 31, 31 and the bottom folded pieces 33, 33, 33, 33.

If the barrel 20 is provided with scratches A, for example, as shown in FIG. 5A, two scratches A are horizontally formed on the barrel 20 near the top 10 and the liquid paper container 100. It is applied to the paper base 2 or from the thermoplastic resin layer 1 to the paper base 2 so as to make one round of the body 20 when the box is made. Further, as shown in FIG. 5B, two scratches B are horizontally applied to the body 20 near the top 10 and from the barrier layer 4 to the sealant layer 6. Are provided at substantially the same position of the laminate.

  Further, the scratch processing B does not necessarily have to be provided so as to make one round of the body portion 20 like the scratch processing A. As shown in FIG. 5 (c), it may be simply provided on the back plate 24, which is a face plate that is stuck to the outside of the sticking plate 25 when the box is made and the side end portion is exposed outward. When the cutting is started for dismantling, the scratch processing B only needs to be at the same position as the scratch processing A, and it is only necessary to suppress the resistance when starting the cutting. Although not shown, the scratch processing B may be provided so as to overlap the position of the scratch processing A in a planar shape instead of a linear shape.

  The scratch processing A can also be provided on the top portion 10 instead of the trunk portion 20. When the top 10 is provided with scratches A, for example, as shown in FIG. 6A, the scratches A are boxed in the liquid paper container 100, one horizontally on the top 10 near the body 20. It is applied to the paper base material 2 or from the thermoplastic resin layer 1 to the paper base material 2 so as to sometimes make a round of the top portion 10. Then, as shown in FIG. 6 (b), scratch processing B is applied to the top portion 10 in the vicinity of the body portion 20 horizontally, from the barrier layer 4 to the sealant layer 6. Are provided at substantially the same position of the laminate.

  Further, as described above, the scratch processing B is not necessarily provided so as to make one round of the body portion 20. When the cutting is started for dismantling, the scratch processing B only needs to be at the same position as the scratch processing A, and it is only necessary to suppress the resistance when starting the cutting.

  Scratch processing A is provided on the paper substrate 2 by half-punching using a blade mold before laminating the thermoplastic resin layer 1 on the outer layer side, and thereafter, the thermoplastic resin layer 1 is provided by extrusion lamination. A stacked body 101a in FIG. 1 may be used. Moreover, after bonding the thermoplastic resin layer 1 to the paper base material 2, it can provide like the laminated body 101b of FIG. 2 by the half punching process using the blade type from the thermoplastic resin layer 1 side.

  In the case of the laminated body 101a, scratch processing A applied to the paper substrate 2 is not exposed on the outer surface, and water or dirt from the outside does not enter the scratch processing A of the paper substrate 2, which is preferable. . In this method, in order to match the registration of scratch processing A and printing, printing is performed on the paper base 2 in advance, or one color, a guideline, and a registration mark are provided at the time of scratch processing. Then, printing is performed on the outer surface of the thermoplastic resin layer 1.

  In the case of the laminated body 101b, since the flaw processing A can be performed in accordance with printing after performing bonding and printing, the process is simple and the processing is easy.

  In the scratch processing B applied from the barrier layer 4 to the sealant layer 6, at least the barrier layer 4 to the sealant layer 6 are bonded together, and then a blade is inserted from the inner sealant layer 6 toward the barrier layer 4. It can be provided by punching. After laminating from the thermoplastic resin layer 1 to the sealant layer 6, the scratch processing B may be performed.

  The shape of the flaw processing A and the flaw processing B is shown in FIG. As for the shape of the scratches A and B, two straight scratches may be provided as shown in FIG. 7A, or a broken line as shown in FIG. Further, the straight tip as shown in (c) may be formed into a polygonal line that is bent obliquely in the direction between two flaws.

  Further, as shown in (d), two short line segments may be inclined obliquely so that the tip end side is closed, and this may form two flaws in two rows. Furthermore, as shown in (e), short horizontal line segments may be arranged with their horizontal positions alternately shifted up and down to form two flaws in two rows. Further, the shapes of the scratch processing A and the scratch processing B are not limited to these shapes.

  In order to form the liquid paper container 100 using the blank 102, the crease between the left side plate 21 and the front plate 22 and the crease between the right side plate 23 and the back plate 24 are folded in a mountain. At this time, the creases at the top 10 and the bottom 30 on the extension of the creases are also folded at the same time.

  Then, the front side of the sticking plate 25 is sealed to the back side of the back plate 24 and the top 10 and the bottom 30 positioned above and below the back plate 24. In addition, it is desirable to protect the end face of the sticking plate 25 in advance so that the paper substrate 2 does not touch the contents.

  The method of protecting the end face is a skive hemming method in which the inner layer sealant layer 6 is left and the outer layer side is scraped off from the paper substrate 2 and the remaining inner sealant layer 6 side is folded back to the outer layer side, or edge pro tape is used. Any method such as a method of sticking so that the end face is covered may be used.

  After the sticking plate 25 is sealed, the crease between the front plate 22 and the right side plate 23 and its extended linear fold are folded in a mountain, and the sticking plate 25 and the left side plate attached to the back plate 24. The crease between 21 and the extended linear crease are fold-folded to form a square cylindrical body 20 composed of four face plates of a left side plate 21, a front plate 22, a right side plate 23, and a back plate 24. To do.

  Next, the bottom 30 is formed. First, the bottom folded pieces 32, 32 are folded inward by folding between the left side plate 21 and the right side plate 23, and the bottom folded pieces 33, 33, 33, 33 are folded with the bottom folded pieces 32, 32. The bottom plates 31 and 31 are folded back with a crease between the front plate 22 and the back plate 24, and the back surfaces of the bottom folded pieces 33, 33, 33, and 33 are respectively connected to the back surfaces of the bottom plates 31 and 31. The bottom seal portion 34 is sealed so as to face each other and the bottom portion 30 is formed.

  A stopper 15 is welded to the stopper hole 16 of the liquid paper container 100 in which the body portion 20 and the bottom portion 30 are formed, and the contents are filled. Subsequently, the folded pieces 12 and 12 are folded inward by a crease between the left side plate 21 and the right side plate 23, and the folded pieces 13, 13, 13 and 13 are creased between the folded pieces 12 and 12. Folded outwards, the roof plates 11 and 11 are folded in a crease between the front plate 22 and the back plate 24, and the back surfaces of the folded pieces 13, 13, 13, and 13 are made the back surfaces of the roof plates 11 and 11, respectively. In this example, the top 10 is a gable roof type, as shown in FIG. 3A, in which the top seal portion 14 is sealed by forming the top portion 10 so as to face each other and filled with the contents. The liquid paper container 100 is completed.

  FIGS. 8A and 8B are schematic diagrams for explaining a cutting / disassembling method when flaw processing is provided on the body portion in an example of the liquid paper container of the present invention, and FIGS. It is a schematic diagram explaining the cutting / disassembling method when flaw processing is provided on the top in an example of the liquid paper container of the present invention.

  In order to dispose of the liquid paper container 100 after using the contents, two scratches are processed from the side edges of the back plate 24 and the roof plate 11 that are stuck on the sticking plate 25. Pull between A and cut into strips.

  As shown in FIG. 5A, in the case where the flaw processing A is provided in the body portion 20, if the space between the flaw processing A is cut into a strip shape, a portion above the flaw processing A is formed as shown in FIG. The lower part can be separated. Then, the upper part of the separated liquid paper container 100 can be cut from the bottom, and the part to which the plug 15 is attached can be cut out as shown in FIG. 8B. A U-shaped flaw processing may be provided on the peripheral edge portion of the plug so as to be connected to the flaw processing provided on the trunk portion, and the plug may be cut off without using a scissors.

  And since the upper end is opened at the lower part of the flaw processing A, it is possible to cut and flatten it by putting a wrinkle from the upper end, to reduce the volume, and to discard it. In addition, the upper and lower parts of the body are scratched, and the bottom of the body is scratched so as to make one round of the body, and it is opened and flattened without using scissors, and the volume is reduced and discarded. You can also. When no metal foil is used for the barrier layer 4, it can be recycled as a paper pack.

  Moreover, as shown to Fig.6 (a), when the flaw process A is provided in the top part 10, it can cut out after folding a top part. If it cuts out, the upper part and the lower part of the flaw process A can be isolate | separated like Fig.9 (a). Then, the upper part of the separated liquid paper container 100 can be cut from the bottom, and the part to which the plug 15 is attached can be cut out as shown in FIG. 9B. A U-shaped flaw processing may be provided on the peripheral edge portion of the plug so as to be connected to the flaw processing provided on the trunk portion, and the plug may be cut off without using a scissors.

  And the part below the scratching A can be similarly cut with a wrinkle from the upper end, cut open, flattened, reduced in volume and discarded. In addition, it is possible to scratch the body part in the vertical direction and to scratch the body part around the bottom part, to open and flatten without using a heel, to reduce the volume, and to discard it can. When no metal foil is used for the barrier layer 4, it can be recycled as a paper pack or the like.

  Although not shown, even when the scratch processing A is provided above the top plug 15, the upper portion and the lower portion of the scratch processing A can be separated by cutting from the scratch processing A. And since the spigot 15 is attached to the lower part of the separated liquid paper container 100, it is possible to cut out the part to which the spigot 15 is attached by putting a bag from above. By providing a U-shaped scratch on the peripheral edge of the plug so as to be connected to the scratch on the top, the plug may be cut off without using a flaw. Similarly, the volume can be reduced and discarded, or it can be recycled.

  Specific examples of the present invention will be described below.

<Example 1>
A 12 μm thick silica-deposited polyethylene terephthalate film for the barrier layer 4 and a 60 μm linear low density polyethylene film for the sealant layer 6 are laminated by dry lamination via a urethane-based two-part curable adhesive for dry lamination of the adhesive layer 5. An interior film was created.

Separately, a paperboard (basis weight 400 g / m ² ) was prepared as the paper base material 2, and scratch processing A was provided by half-punching using a roll provided with a blade shape. Extrude the ethylene / methacrylic acid copolymer resin of the adhesive resin layer 3 from the T-die to a thickness of 20 μm on one side of the paper substrate 2 provided with the scratch processing A, and adhere the surface on the barrier layer 4 side of the interior film. A liquid paper container is prepared by pressing and laminating the molten resin surface of the resin layer 3 on the opposite side of the paper substrate 2 and extruding the low-density polyethylene of the thermoplastic resin layer 1 from the T-die to a thickness of 10 μm. The laminated sheet used for was manufactured.

  Further, when the thermoplastic resin layer 1 was laminated, a corona treatment was performed on the outer surface of the thermoplastic resin layer 1 immediately after the lamination. And the printing layer used as a pattern was provided in the corona treatment surface of the thermoplastic resin layer 1 with the printing machine.

  From this inner side of the sealant layer 6 side of the laminated sheet, scratch processing B was provided by half-punching using a roll provided with a blade mold, and a laminated body such as the laminated body 101a of FIG. 1 was created.

  Scratch processing A has the shape shown in FIG. 7C, the horizontal straight line portion is 7 mm, and the length of the diagonally bent portion is 2 mm. The width A was set to 15 mm.

  Scratch processing B was a linear shape as shown in FIG. 7A, and the upper and lower two scratch processing B were provided to have a width of 15 mm. Then, it was made into a blank as shown in FIG. 4, boxed, attached with a stopper, and a liquid paper container having a capacity of 2000 ml was prepared, and the liquid paper container of Example 1 was obtained.

<Example 2>
A biaxially stretched nylon film 15 μm of the barrier layer 4 and a linear low density polyethylene film 40 μm of the sealant layer 6 were laminated via a low density polyethylene film 20 μm of the adhesive layer 5 by sandwich lamination to obtain an interior film. .

Separately, a paperboard (basis weight 350 g / m ² ) is prepared as the paper base 2, and the low density polyethylene of the adhesive resin layer 3 is extruded from the T die by sandwich lamination on the surface of the paper base 2 to a thickness of 20 μm. The nylon film surface of the interior film is pressure-bonded to the molten resin surface of the adhesive resin layer 3 and laminated, and the low-density polyethylene of the thermoplastic resin layer 1 is extruded from the T-die onto the opposite surface of the paper substrate 2 to obtain a thickness. A laminated sheet having a thickness of 10 μm and used for a liquid paper container was manufactured.

  From the thermoplastic resin layer 1 on the outer side of the laminated sheet to the middle of the paper substrate 2, scratch processing A was provided by half punching using a roll provided with a blade die. Further, a scratch B was provided so that the blade could reach from the inner sealant layer 6 through the nylon film of the barrier layer 4 to the low density polyethylene of the adhesive resin layer 3.

  In the shape shown in FIG. 7 (d), two line segments in which the both ends of the line segment having a length of 5 mm are inclined by 2 mm above and below are lined up and down in the direction in which the front end side is closed and the wound processing A is horizontally arranged. This was made continuous in the direction, and was further provided 15 mm apart in two rows above and below to provide scratch processing A. Except for this, a liquid paper container of Example 2 was prepared in the same manner as Example 1.

<Example 3>
A linear low-density polyethylene film 60 μm of the sealant layer 6 is laminated on one side of an alumina-deposited polyethylene terephthalate film 12 μm of the barrier layer 4 by dry lamination via a urethane-based two-component curable adhesive for dry lamination of the adhesive layer 5. Then, a low-density polyethylene film 30 μm was laminated on the opposite surface by dry lamination via a urethane-based two-component curable adhesive for dry lamination to produce an interior film.

  From the linear low-density polyethylene film side of the sealant layer 6 of this interior film, half-cutting is performed using a roll provided with a blade, and the barrier layer 4 penetrates through the alumina-deposited polyethylene terephthalate film, and the opposite surface is low. A blade was inserted so that it reached the density polyethylene film but was not cut, and scratch processing B was performed.

Separately, a paperboard (basis weight 400 g / m ² ) was prepared as the paper base material 2, and scratch processing A was provided by half-punching using a roll provided with a blade shape. The low-density polyethylene of the adhesive resin layer 3 is extruded from a T-die to a thickness of 20 μm on one side of the paper substrate 2 provided with the scratch processing A, and the low-density polyethylene film surface of the interior film is melted by the adhesive resin layer 3. A laminated sheet used for a liquid paper container is formed by pressing and laminating the resin surface and then laminating the low-density polyethylene of the thermoplastic resin layer 1 from the T-die on the opposite surface of the paper substrate 2 with a thickness of 20 μm. Manufactured. Except for this, a liquid paper container of Example 3 was produced in the same manner as Example 1.

<Example 4>
A silica-deposited polyethylene terephthalate film 12 μm of the barrier layer 4 and a linear low-density polyethylene film 40 μm of the sealant layer 6 were laminated via a low-density polyethylene film 20 μm of the adhesive layer 5 by sandwich lamination to obtain an interior film. .

Separately, a paperboard (basis weight 350 g / m ² ) is prepared as the paper base 2, and the low density polyethylene of the adhesive resin layer 3 is extruded from the T die by sandwich lamination on the surface of the paper base 2 to a thickness of 20 μm. The inner surface of the laminated film is pressure-bonded to the molten resin surface of the adhesive resin layer 3 and the low-density polyethylene of the thermoplastic resin layer 1 is extruded from the T die onto the opposite surface of the paper substrate 2. A laminated sheet having a thickness of 10 μm and used for a liquid paper container was manufactured.

  From the thermoplastic resin layer 1 on the outer side of the laminated sheet to the middle of the paper substrate 2, scratch processing A was provided by half punching using a roll provided with a blade die. Further, a scratch B was provided so that the blade could reach from the inner sealant layer 6 through the nylon film of the barrier layer 4 to the low density polyethylene of the adhesive resin layer 3.

  In the shape shown in FIG. 7 (d), two line segments in which the both ends of the line segment having a length of 5 mm are inclined by 2 mm above and below are lined up and down in the direction in which the front end side is closed and the wound processing A is horizontally arranged. This was made continuous in the direction, and was further provided 15 mm apart in two rows above and below to provide scratch processing A. Except for this, a liquid paper container of Example 4 was produced in the same manner as Example 1.

<Example 5>
A liquid paper container of Example 5 was produced in the same manner as Example 2 except that the scratching B was provided only on the sticking plate 25.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A liquid paper container of Comparative Example 1 was prepared in the same manner as in Example 1 except that the scratching A was provided and the scratching B was not provided.

<Comparative Example 2>
A liquid paper container of Comparative Example 2 was prepared in the same manner as in Example 1 except that the scratching B was provided and the scratching A was not provided.

<Test method>
About the Example and the comparative example, it tested by the following method and compared and evaluated.

<Disassembly evaluation>
It was dismantled by hand, and it was evaluated by sensuality whether it was easy to open. Examples 1 to 3 and Comparative Example 1 were performed by placing a finger on the scratched A portion at the body or top bonded portion. About the comparative example 2, it applied in the same way, putting a finger on the bonding part of a trunk | drum.

  The evaluation was performed by 30 adult males and 30 adult females, and 80% or more of those who could be easily disassembled were rated as ○, and less than 80% were evaluated as ×. The results are summarized in Table 1.

<Drop impact test>
The liquid paper containers of Examples and Comparative Examples filled with water were dropped from a height of 80 cm onto a concrete floor surface in an upright state, and the liquid leakage state was confirmed.

  The dropping was performed 5 times each, and after dropping, the leakage was checked with the penetrant. In particular, in the liquid paper container of the example, the scratched portion was observed in detail. Ten pieces of each were tested, and no one leaked was marked as ◯. The case where even one leak was evaluated as x. The results are summarized in Table 1.

<Comparison result>
Below, the comparison result of an Example and a comparative example is demonstrated.
The liquid paper containers of Examples 1 to 5 were all good because they could be easily disassembled by disassembling evaluation, and no liquid leakage occurred in the drop test.

  On the other hand, the liquid paper containers of Comparative Examples 1 and 2 did not leak in the drop impact test.

DESCRIPTION OF SYMBOLS 100 ... Liquid paper container 101a, 101b ... Laminated body 102 ... Blank 1 ... Thermoplastic resin layer 2 ... Paper base material 3 ... Adhesive resin layer 4 ... Barrier layer 5 .... Adhesive layer 6 ... Sealant layer A, B ... Scratch processing 10 ... Top part 11, 11 ... Roof plate 12, 12 ... Folding pieces 13, 13, 13, 13 ... Folding Piece 14 ... Top seal 15 ... Plug 16 ... Plug hole 20 ... Body 21 ... Left side plate 22 ... Front plate 23 ... Right side plate 24 ... Back Face plate 25... Adhesion plate 30... Bottom portion 31, 31... Bottom plate 32, 32... Bottom folding piece 33, 33, 33, 33.

Claims (2)

A thermoplastic resin layer, a paper base material, an adhesive resin layer, a barrier layer, and a sealant layer are sequentially laminated from the outer layer side toward the inner layer side. A liquid paper container comprising a top portion for closing an upper end and a bottom portion for closing a lower end of the body portion,
Scratch processing A is applied to the paper base material or from the thermoplastic resin layer to the paper base material, and scratch processing B is applied from the barrier layer to the sealant layer. Is provided at substantially the same position as the position of the laminate provided with the scratch processing A,
In addition, the scratch processing A and the scratch processing B do not penetrate through the adhesive resin layer . The liquid paper container according to claim 1, wherein the scratch processing A is performed so as to make one round of the trunk portion or the top portion .