JP2017052543A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for liquid which can be easily disassembled and has stable sealability.SOLUTION: A paper container for a liquid is made of a laminate in which a thermoplastic resin layer 1, a paper base material 2, an adhesive resin layer 3, a barrier layer 4, an adhesive layer 5 and a sealant layer 6 are sequentially stacked toward an inner layer side from an outer layer side. The paper container for the liquid includes a cylindrical body, a top part for closing an upper end of the body, and a bottom for closing a lower end of the body. Scratch processing 7 is applied to the paper base material or from the thermoplastic resin layer to the paper base material, and a tear strength of a base material film 4c of the barrier layer 4 is 120 mN or less.SELECTED DRAWING: Figure 1

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, empty containers have been dismantled at the time of disposal by separating and collecting empty containers after use and reducing the volume of waste due to environmental conservation problems. In addition, there is a gable roof-shaped roof plate with a stopper, but since the stopper is firmly welded, the top seal is opened to separate the stopper for disposal. Then, 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 Japanese Patent No. 3844310

  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.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid paper container that can be easily disassembled and has a stable sealing property.

The present invention has been made to solve the above problems, and the invention of claim 1 of the present invention is that the thermoplastic resin layer, the paper substrate, the barrier layer, and the sealant layer are from the outer layer side toward the inner layer side. A liquid paper container composed of a laminated body sequentially laminated, comprising a cylindrical body, a top for closing the upper end of the body, and a bottom for closing the lower end of the body,
The paper substrate is scratched or scratched from the thermoplastic resin layer to the paper substrate, and the tear strength of the barrier layer substrate film is 120 mN or less. This is a liquid paper container.

  The invention according to claim 2 of the present invention is characterized in that the flaw processing is provided in a line shape in the circumferential direction so as to make one round of the body portion or the top portion of the liquid paper container. A liquid paper container according to claim 1.

  The invention according to claim 3 of the present invention is the liquid paper container according to claim 1 or 2, wherein the scratching is provided by punching or half-punching using a blade die.

  The invention of claim 4 of the present invention is characterized in that the barrier layer is a deposited film in which a deposited layer is provided on the substrate film, or a laminated film in which a metal foil is laminated on the substrate film. Item 4. The liquid paper container according to any one of Items 1 to 3.

  The liquid paper container of the present invention is scratched on a paper base material or from the thermoplastic resin layer to the paper base material, and the tear strength of the base film of the barrier layer is 120 mN or less. Therefore, it can be easily broken and disassembled from the scratched part, and the sealing property is stable and difficult to break.

  Since the flaw processing is provided linearly in the circumferential direction so as to go around the body part or the top part of the liquid paper container, the body part or the top part is separated vertically. Can be cut into pieces and easy to dismantle.

  Since the flaw processing is provided by punching or half punching using a blade mold, it can be easily processed.

  Since the barrier layer is a vapor-deposited film in which a vapor-deposited layer is provided on the base film, or a laminated film in which a metal foil is laminated on the base film, the barrier property is extremely high.

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. It is explanatory drawing which showed typically the other example of the laminated body used for an example of the liquid paper container of this invention in the cross section. (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. (A) 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. (B) 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)-(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 method of cutting | disconnection and dismantling when flaw processing is provided in the top part in an example of the liquid paper container of this 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. 3 is an explanatory view schematically showing a cross section of still another example of a laminate used in an example of the liquid paper container of the present invention, and FIG. An explanatory view schematically showing an example of the liquid paper container in perspective, FIG. 7B is an explanatory view schematically showing another example of the liquid paper container of the present invention in perspective.

  As shown in FIG. 1, the laminate 101a used in the liquid paper container 100 of the present example has 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. A barrier layer 4, an adhesive layer 5, and a sealant layer 6 are sequentially laminated, and the barrier layer 4 includes a vapor deposition layer 4a and a base film 4c. Moreover, you may provide a printing layer in the outer surface of the thermoplastic resin layer 1 as needed.

  The paper substrate 2 is subjected to scratch processing 7. The scratch processing 7 may be performed not only on the paper base 2 but also from the thermoplastic resin layer 1 and applied to the thermoplastic resin layer 1 and the paper base 2 as in the laminate 101b of FIG. . Moreover, you may use the laminated | multilayer film which bonded metal foil 4b and the base film 4c as a barrier layer like FIG.

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

  Using this thermoplastic resin, it can be provided on the outer surface of the paper substrate 2 by extrusion lamination. In addition, the printing layer provided in the outer surface of the thermoplastic resin layer 1 is a layer containing a pattern, product information, etc. given by methods, such as gravure printing and offset printing, using a 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.

  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.

  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.

  In order to increase the adhesive strength, the surface of the paper substrate 2 or the barrier layer 4 can be subjected to easy adhesion treatment such as corona treatment, ozone treatment, and anchor coating.

  The barrier layer 4 may be a deposited film in which a deposited layer 4a is provided by depositing a metal such as aluminum or tin, or a metal oxide such as silica or alumina on the base film 4c. The thickness of the vapor deposition layer 4a is preferably 5 to 100 nm.

  Moreover, the laminated film which laminated | stacked the base film 4c on metal foil 4b, such as aluminum, as the barrier layer 4 can be used. Lamination can be performed by dry lamination or the like. The thickness of the metal foil 4b is preferably 5 to 15 μm.

  A resin film such as polyethylene terephthalate, nylon, or polypropylene is used for the base film 4c used for these. In particular, these biaxially stretched films are preferably used because they have less expansion and contraction during vapor deposition and bonding. A thickness of 6 to 25 μm is preferably used. The vapor deposition layer 4a and the metal foil 4b of the barrier layer 4 may be on the paper base material 2 side or the sealant layer 6 side from the base material film 4c.

  Since the base film 4c must be torn when the laminate of the liquid paper container 100 is torn at the scratched portion 7 provided on the paper base material 2, the base film 4c must also be easy to tear. Don't be.

  If the tear strength is 120 mN or less, the base film 4c can also be torn when it is torn at the portion of the wound processing 7. The tear strength can be measured by JIS K 7128-2 Plastics-Test method for tear strength of films and sheets-Part 2: Elmendorf tear method. Furthermore, in order to improve tearability, the base film 4c may be provided with a partial scratch processing.

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 .

  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. Moreover, it is good also as blend resin of polyethylene resins, such as a low density polyethylene, a linear low density polyethylene, a medium density polyethylene, a high density polyethylene, and a thermoplastic elastomer in order to make opening of a sealing part easy. 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, the laminated body 101b, and the laminated body 101c used in the liquid paper container 100 of the present example have been described. However, considering the use as the liquid paper container, the rigidity and durability required for the liquid paper container are described. For the purpose of improvement, a configuration in which another layer is further interposed in the above layer configuration may be employed.

  As shown in FIG. 4A, the liquid paper container 100 of the present example includes a body portion 20 that is formed into a cylindrical shape by providing a body portion bonding portion, a top portion 10 that closes the upper end of the body portion 20, and the body portion 20. A liquid paper container having a bottom portion 30 that closes the lower end, and the top portion 10 is a liquid paper container 100 of a gobel 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.

  The scratch processing 7 is applied to the paper base 2 or from the thermoplastic resin layer 1 to the paper base 2. The flaw processing 7 is provided by punching or half punching using a blade die.

  FIG. 5 is an explanatory view schematically showing a blank of an example of the liquid paper container of the present invention, and FIG. 6A is a position of scratch processing provided on the body portion of the blank of the example of the liquid paper container of the present invention. FIG. 7B is an explanatory diagram schematically showing the position of scratch processing provided on the top portion of the blank of an example of the liquid paper container of the present invention, and FIG. ) Is an explanatory view illustrating the shape of flaw processing provided in an example of the liquid paper container of the present invention.

  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, the laminated body 101b, and the laminated body 101c is provided by pressing a crease indicated by an alternate long and short dash line, A blank 102 for the liquid paper container 100 of this example as shown in FIG. 5 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. 5, the blank 102 of the liquid paper container 100 is sequentially provided with four rectangular face plates including a left side plate 21, a front plate 22, a right side plate 23, and a back plate 24 that form the body 20. A sticking plate 25 is provided on the left edge of the left side plate 21. Adhesive plate 25 is top 1
Each extends from 0 to the bottom 30.

  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.

  And when the flaw processing 7 is provided in the trunk | drum 20, as shown to Fig.6 (a), the flaw processing 7 is horizontally provided in the trunk | drum 20 in the vicinity of the top part 10, and the liquid paper container 100 has two. It is applied to the paper base 2 so as to make one round of the body 20 when the box is made.

  The flaw processing 7 can be provided on the top portion 10 instead of the trunk portion 20. When the top 10 is provided with the scratch 7, for example, as shown in FIG. 6B, the scratch 7 is horizontally formed on the top 10 in the vicinity of the body 20 and boxed in the liquid paper container 100. 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.

  The scratch processing 7 of the paper base material 2 can be provided like the laminated body 101b of FIG. 2 by pasting the laminated bodies and performing half-punching using a blade mold. Further, before laminating the thermoplastic resin layer 1 on the outer layer side, it is provided by half-punching using a blade mold, and then the thermoplastic resin layer 1 is provided by extrusion lamination, and the laminate 101a in FIG. It can also be as shown by 101c in FIG.

  In the case of the laminates 101a and 101c, the scratch 7 applied to the paper base 2 is not exposed to the outer surface, and water or dirt from the outside may enter the scratch 7 of the paper base 2. Not preferred. In this method, in order to accurately align the scratch processing 7 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. Accordingly, printing can be performed on the outer surface of the thermoplastic resin layer 1.

  In the case of the laminated body 101b, since the flaw processing 7 can be performed in accordance with the printing after the bonding and printing, the process is simple and the processing is easy.

  The shape of the flaw processing 7 is shown in FIG. The shape of the flaw processing 7 may be two straight flaw processing as shown in (a) of FIG. 7 or may be provided in a broken line shape as shown in (b). 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. Moreover, it is not limited to these shapes. Furthermore, it is preferable to provide two scratches as shown in the drawing so that the scratches 7 can be cut into a strip shape, but the present invention is not limited to this, and one or three or more scratches may be provided.

  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 protape 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 views 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. 9A and 9B. These are the schematic diagrams 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 discard the liquid paper container 100 after using the contents, the scratch processing 7 is cut from the side edges of the back plate 24 and the roof plate 11 that are stuck on the sticking plate 25. And cut it out. If it is difficult to cut, scissors or the like may be used to create the trigger part.

  As shown in FIG. 6A, in the case where the flaw processing 7 is provided in the body portion 20, if the space between the two flaw processing 7 is cut into a band shape, the top of the flaw processing 7 is obtained as shown in FIG. And 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. By providing a U-shaped scratch on the peripheral edge of the plug so as to be connected to the scratch provided on the trunk, the plug may be cut off without using a scissors.

  And since the upper part is opened at the lower part of the flaw processing 7, it can cut | disconnect by making a wrinkle from the upper end, cut open and flattened, can reduce and discard. Also, the body can be scratched up and down, and the body can be scratched around the bottom in the vicinity of the bottom, and can be opened and flattened without using scissors, and reduced in volume and discarded. . When no metal foil is used for the barrier layer 4, it can be recycled as a paper pack.

  In addition, as shown in FIG. 6B, when one flaw processing 7 is provided on the top portion 10, it is easy to cut off by folding the top portion 10 and pulling the top and bottom of the flaw processing 7. When cut off, as shown in FIG. 9A, the upper portion and the lower portion of the scratch processing 7 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. 9B. 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 lower part of the scratching 7 can be scraped and flattened from the upper end, flattened, reduced in volume and discarded. Further, the body 20 in the vicinity of the bottom 30 can also be scratched so as to make one round, and can be cut open and flattened without using a scissors, and reduced in volume and discarded. When no metal foil is used for the barrier layer 4, it can be recycled as a paper pack.

  Although not shown, even when the wound processing 7 is provided above the plug 15 of the top portion 10, the upper portion and the lower portion of the wound processing 7 can be separated by tearing from the scratch processing 7. 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>
The barrier layer 4 is an alumina-deposited polyethylene terephthalate film 12 μm-deposited layer 4a surface and the sealant layer 6 are laminated by dry lamination via a dry laminate urethane-based two-component curable adhesive to form an interior film. did. The sealant layer 6 was a 60 μm unstretched film of linear low density polyethylene.

  JIS K 7128-2 plastic film of polyethylene terephthalate film of 12 μm of base film 4c used for 12 μm of alumina-deposited polyethylene terephthalate film of barrier layer 4-Test method for tear strength of film and sheet-Part 2: Measured by Elmendorf tear method The tear strength was 100 mN.

A paperboard (basis weight 400 g / m ² ) is prepared as the paper base material 2, and the ethylene / methacrylic acid copolymer resin of the adhesive resin layer 3 is extruded from a T-die on one side of the paper base material 2 to a thickness of 30 μm. The surface of the polyethylene terephthalate film of the base film layer 4c of the barrier layer 4 of the interior film was pressed and laminated to the molten resin surface of the adhesive resin layer 3.

  From the outer surface side of this laminate, scratch processing 7 was provided on the paper base material 2 by half punching using a roll provided with a blade die as shown in FIG. Scratch processing 7 is a portion where the box 20 in the vicinity of the top portion 10 is bent obliquely with the shape of FIG. The cuts having a length of 2 mm were continuously arranged in the horizontal direction, and the width of the upper and lower two scratches 7 was set to 15 mm.

  Next, a low-density polyethylene of the thermoplastic resin layer 1 was extruded from a T-die on the surface of the paper substrate 2 and provided with a thickness of 18 μm to produce a laminate used for a liquid paper container. 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.

  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>
The liquid of Example 2 was used in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 110mN. A paper container was created.

<Example 3>
The liquid of Example 3 was used in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 120mN. A paper container was created.

<Example 4>
Liquid paper of Example 4 in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 90mN. A container was created.

<Example 5>
The liquid of Example 5 was used in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 80mN. A paper container was created.

<Example 6>
The liquid of Example 6 was used in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 70mN. A paper container was created.

<Example 7>
The liquid of Example 7 was the same as Example 1, except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 60mN. A paper container was created.

<Example 8>
The liquid of Example 8 was used in the same manner as in Example 1, except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 50mN. A paper container was created.

<Example 9>
Example 9 is the same as Example 1 except that 15 μm of alumina-deposited nylon film is used for the barrier layer 4, and the nylon film 15 μm of the base film 4 c used is that having a tear strength of 100 mN. A liquid paper container was created.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
The liquid of Comparative Example 1 is the same as Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 is the same as in Example 1 except that a film having a tear strength of 130mN is used. A paper container was created.

<Comparative example 2>
The liquid of Comparative Example 2 was obtained in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was a tear strength of 140mN. A paper container was created.

<Comparative Example 3>
The liquid of Comparative Example 3 was obtained in the same manner as in Example 1 except that the polyethylene terephthalate film 12c of the base film 4c used for the alumina-deposited polyethylene terephthalate film 12m of the barrier layer 4 was used with a tear strength of 150mN. A paper container was created.

<Comparative example 4>
Comparative Example 4 was the same as Example 1 except that 15 μm of alumina-deposited nylon film was used for the barrier layer 4, and 15 μm of the nylon film of the base film 4 c used was that having a tear strength of 130 mN. A liquid paper container was created.

<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 whether it was easy to open or not was evaluated by sensuality. It was performed by placing a finger while the two scratches 7 on the laminated body that were outside the body bonded portion were lined up and down.

The evaluation was performed for 30 adult males and 30 adult females. The evaluation was evaluated as “◯” when 80% or more of the persons were easily disassembled, and “×” when the disassembly was less than 80%. The results are summarized in Table 1.

  Below, the comparison result of an Example and a comparative example is demonstrated.

<Comparison result>
In any of the liquid paper containers of Examples 1 to 9, the two scratches 7 provided in the dismantling evaluation could be easily cut into a strip shape, and the dismantling property was good.

  On the other hand, in the disassembling evaluation, the liquid paper containers of Comparative Examples 1 to 4 are cut even if an attempt is made to cut them by placing a finger between two wound processing portions 7 at the bonding portion of the body portion. Could not be dismantled.

DESCRIPTION OF SYMBOLS 100 ... Liquid paper container 101a, 101b, 101c ... Laminated body 102 ... Blank 1 ... Thermoplastic resin layer 2 ... Paper base material 3 ... Adhesive resin layer 4 ... Barrier layer 4a ... deposition layer 4b ... metal foil 4c ... base film 5 ... adhesive layer 6 ... sealant layer 7 ... scratch processing 10 ... top 11 ... roof 12 ... ·· Folding piece 13 ··· Folding piece 14 ··· Top seal portion 15 ··· Plug 16 ··· Plug hole 20 · · · Body portion 21 ··· Left side plate 22 · · · Front plate 23 .. right side plate 24 ... back plate 25 ... sticking plate 30 ... bottom 31 ... bottom plate 32 ... bottom folded piece 33 ... bottom folded piece 34 ... bottom seal part

Claims (4)

A thermoplastic body layer, a paper base material, a barrier layer, and a sealant layer are sequentially laminated from the outer layer side toward the inner layer side, and are formed of a laminated body, and a cylindrical body portion and a top portion that closes the upper end of the body portion And a liquid paper container consisting of a bottom portion closing the lower end of the body portion,
The paper substrate is scratched or scratched from the thermoplastic resin layer to the paper substrate, and the tear strength of the barrier layer substrate film is 120 mN or less. Characteristic liquid paper container.   2. The liquid paper container according to claim 1, wherein the flaw processing is provided in a line shape in a circumferential direction so as to make one round of the body part or the top part of the liquid paper container.   3. The liquid paper container according to claim 1, wherein the scratch processing is provided by punching or half punching using a blade die.   The barrier layer is a vapor deposition film in which a vapor deposition layer is provided on the base film, or a laminated film in which a metal foil is laminated on the base film, according to any one of claims 1 to 3. The liquid paper container as described.