JP2013060214A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for a liquid, which maintains shape retainability and good appearance, and has a window through which the amount of remaining contents can be visually checked.SOLUTION: The paper container 50 for a liquid is formed of a laminate including a thermally-fusible outer layer/a base layer (paper)/an intermediate layer having gas barrier property/a sealant layer (an inner layer), and includes a top part, a body part and a bottom part. The body part has a square cylindrical shape formed through four side edge lines 28 of four side plates. A rectangular window 30 is formed in a part where at least one of the side edge lines are formed. A window film 10 is adhered to the window part from the sealant layer side to cover the entire window surface. The window film is arranged inside an elliptical section which is connected by the two edge lines to face each other.

Description

  The present invention relates to a liquid paper container for storing sake, shochu, etc., and in particular, a gas barrier type liquid paper container having a window for checking the remaining amount in which the remaining amount of the stored contents can be accurately recognized. About.

  Conventionally, as a gas barrier type liquid paper container for storing sake, shochu, wine, etc., a gable-top type paper container having a cylindrical body and a roof-type top part, or a flat-top type paper having a flat top part. Container is used.

  The material composition of these paper containers uses paper from the viewpoints of ease of molding, shape retention, light shielding, etc., and uses aluminum foil in consideration of gas barrier properties, for example, the outside of the paper container To polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate film / polyethylene laminate.

  For this reason, in the paper container of the said structure, it was impossible to visually recognize the contents stored from the outside of the paper container, and there was a problem that the remaining amount was not particularly understood.

  In order to solve these problems, there are the following proposals. The blank 70 shown in FIG. 9 has a side plate 24 that forms the body portion 22, and a window portion 30 is formed in the lower portion of the side plate. Moreover, the window pasting film 10 is stuck on the window so as to cover the entire window 30 from the liquid contact side. A paper container 80 shown in FIG. 10 in which the blank 70 is assembled so that the contents contained therein can be visually recognized from the outside has been proposed (Patent Document 1).

  In addition, as in Patent Document 1, there is a proposal in which a window 30 is provided at the lower part of the side plate 24 of the paper container and the remaining amount of the contents can be easily seen (Patent Document 2).

  However, in both Patent Documents 1 and 2, since the window is formed in the lower part of the side plate of the paper container, it can be visually recognized when the remaining amount is low, but there is a problem that it cannot be visually recognized regardless of the remaining amount. Moreover, since it is provided in the lower part of the side plate, there are problems such as deteriorating the cosmetics of the paper container.

Japanese Patent Application Laid-Open No. 11-227752 JP 2005-96777 A

  In view of such background arts, it is an object of the present invention to provide a liquid paper container having a window portion that maintains the shape-retaining properties and cosmetics of the paper container and can be viewed regardless of the remaining amount of contents.

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

The invention according to claim 1 of the present invention is a laminate comprising paper as a base material layer and comprising an outer surface layer having heat-fusibility / base material layer / intermediate layer having gas barrier properties / sealant layer (inner surface layer),
The top portion, the body portion, and the bottom portion, and the body portion is a rectangular cylindrical liquid paper container in which four side plates are formed through four side ridge ruled lines, respectively,
A rectangular window is formed in a portion where at least one side ridge ruled line of the side ridge ruled line is formed,
The window is pasted with a window pasting film that covers the entire surface from the sealant layer side,
The liquid sheet container is characterized in that the window pasting film is provided in an elliptical section connected to each other by two ridge lines.

  The invention according to claim 2 of the present invention is characterized in that the shape of the window portion is such that the width is 10% of the square dimension of the paper container and the height is 90% of the side ridge ruled line. It is a liquid paper container of description.

  The invention according to claim 3 of the present invention is characterized in that the shape of the window pasting film is such that the width is 15% of the square dimension of the paper container and the height is 95% of the side ridge ruled line. The liquid paper container according to 1 or 2.

  In the invention according to claim 4 of the present invention, each of the ridge ruled lines has an elliptical shape in which the height is the same as that of the side ridge ruled line, both ends have a radius of curvature R = 30 mm, and are connected to each other. The liquid paper container according to any one of claims 1 to 3, wherein a lateral width is 20% of an angular dimension of the paper container.

  According to a fifth aspect of the present invention, the window pasting film is a composite film comprising at least a polyethylene film and a polyethylene terephthalate film on which aluminum oxide or silicon oxide is deposited. It is a liquid paper container given in any 1 statement of a statement.

  The invention according to claim 6 of the present invention is the liquid paper according to any one of claims 1 to 5, wherein the intermediate layer is a polyethylene terephthalate film on which aluminum oxide or silicon oxide is deposited. It is a container.

  In the liquid paper container of the present invention, a rectangular window portion is formed at a portion where one side ridge ruled line is formed, and a window pasting film is stuck from the sealant layer side so as to cover the window portion. The window pasting film is provided in an elliptical section connected by two ridge lines. This is a liquid paper container in which the shape-retaining property and handling property of the paper container in which the contents are stored are maintained and can be visually recognized regardless of the remaining amount of the contents. Moreover, since the window part is formed in the ridge line part, the sales effect can be maintained without impairing the cosmetic properties of the paper container.

According to claim 1 of the present invention, a laminate comprising paper as a base material layer and comprising an outer surface layer having heat-fusibility / base material layer / intermediate layer having gas barrier properties / sealant layer (inner surface layer),
The top portion, the body portion, and the bottom portion, and the body portion is a rectangular cylindrical liquid paper container in which four side plates are formed through four side ridge ruled lines, respectively,
A rectangular window is formed in a portion where at least one side ridge ruled line of the side ridge ruled line is formed,
The window is pasted with a window pasting film that covers the entire surface from the sealant layer side,
The window pasting film is provided in elliptical sections connected to each other by two ridge ruled lines. In the rectangular cylindrical liquid paper container, a window portion is formed at a portion where one side ridge ruled line is formed among the four side ridge ruled lines forming the trunk portion. Since it forms in the part of a side ridge ruled line, it can visually recognize regardless of the residual amount of the content. Since the window pasting film is stuck on the window portion so as to cover the entire surface from the sealant layer side, there is no leakage of the contents. Further, since the two ridge lines are provided so as to surround the window pasting film, the shape retention and handling properties of the paper container can be maintained. Further, since the window portion is provided at the side ridge ruled portion, it has the cosmetic effect of the paper container and the sales effect at the store.

  According to a second aspect of the present invention, the shape of the window portion is characterized in that the width is 10% of the square dimension of the paper container and the height is 90% of the side ridge ruled line. The square dimension of the paper container refers to the length of one side of the rectangular cylindrical body. That is, the width of the side plate. The height of the ridge ruled line is equivalent to the height of the side plate and the height of the side ridge ruled line. The window portion is a rectangle with 10% of the square size of the paper container and 90% of the height of the side ridge ruled line, and can be visually recognized from a large remaining amount to a small remaining amount regardless of the remaining amount of the contents. When the square size is 10% or more and the ridge ruled line is 90% or more, the window pasting film tends to overlap the ridge ruled line, and the ridge ruled line is insufficient. This will impair the shape retention and handling of the paper container.

  According to claim 3 of the present invention, the window pasting film is characterized in that the width is 15% of the square dimension of the paper container and the height is 95% of the side ridge ruled line. In order to seal the window, the window pasting film is made larger than the size of the window. A seal part for attaching the window pasting film to the window part is required. However, when the square dimension is 15% or more and the height is 95% or more of the side ridge ruled line, the window pasting film tends to overlap with the ridge ruled line, and the ridge ruled line is insufficient. The size of the window pasting film is preferably larger than the size of the window portion and does not overlap the two ridge lines.

  According to claim 4 of the present invention, each of the ridge ruled lines has an elliptical lateral width in which the height is the same as that of the side ridge ruled line, both ends have a radius of curvature R = 30 mm, and are connected in opposition to each other. Is 20% of the square dimension of the paper container. The window portion is provided in an elliptical section connected by two ridge ruled lines. If the width is 20% or more of the square size, the shape retention of the paper container is lowered. Moreover, when it is within 20%, it becomes easy to overlap with the window pasting film. Moreover, since both ends of each ridge ruled line have a radius of curvature R = 30 mm, the process of providing the ridge ruled line is easy.

  The invention according to claim 5 of the present invention is characterized in that the window pasting film is a composite film composed of at least a polyethylene film and a polyethylene terephthalate film deposited with aluminum oxide or silicon oxide. For contents requiring gas barrier properties such as sake, shochu, wine, etc., the gas barrier properties are also required for the window pasting film. In addition, transparency is necessary to visually recognize the remaining amount of contents. Therefore, an inorganic compound vapor-deposited polyethylene terephthalate film is used. As the inorganic compound, aluminum oxide or silicon oxide can be used with excellent transparency and gas barrier properties. One polyethylene film is used for heat-sealing with the sealant layer of the paper container.

  The invention according to claim 6 of the present invention is characterized in that the intermediate layer is a polyethylene terephthalate film on which aluminum oxide or silicon oxide is deposited. A polyethylene terephthalate film on which aluminum oxide or silicon oxide having excellent gas barrier properties is vapor-deposited is used as an intermediate layer in order to maintain gas barrier properties as a paper container. When discarded after use, liquid paper containers such as sake, shochu, and wine can be discarded as recycled resource waste.

It is explanatory drawing which shows an example of the blank (the inner surface is shown) of the paper container of this invention. It is explanatory drawing which shows an example of the blank (The window part was stuck with the window sticking film) of FIG. It is explanatory drawing which assembles the blank of FIG. 2 and shows an example of a gable top type paper container. It is explanatory drawing which shows an example of the window part in an elliptical division. It is a section explanatory view showing an example of composition of a layered product of the present invention. It is a section explanatory view showing an example of composition of a window pasting film of the present invention. It is sectional explanatory drawing which shows an example of a structure of the window part of this invention. It is explanatory drawing which shows an example of the flat top type paper container of this invention. It is explanatory drawing which shows an example of the blank (The window part was stuck with the window sticking film) of the conventional paper container. It is explanatory drawing which assembles the blank of FIG. 9 and shows an example of a gable top type paper container.

  Hereinafter, modes for carrying out the present invention will be described. A blank for producing a gable top type paper container will be described as an example.

  FIG. 1 is an explanatory view showing an example of a blank (showing the inner surface) of the paper container of the present invention. The blank 20 has a barrel portion 22 having four side plates 24 and an adhesive margin piece 25 connected to one of the side plates, and a folding piece 26 is formed at one open end of the barrel portion. The top part 21 and the bottom part 23 in which the bottom piece 27 is formed in the other opening end part of the trunk | drum 22 are comprised. In particular, the body 22 has four side plates 24 connected to each other via side ridge lines 28. In the side ridge ruled line 28, a window portion 30 is formed at a portion where one side ridge ruled line is formed. It is preferable that the window portion is provided so as to avoid the portion of the side ridge ruled line in contact with the adhesive margin piece 25. You may provide in the site | part of any side ridge ruled line of the other three side ridge ruled lines.

  This window 30 is for visually recognizing the remaining amount of contents in the assembled liquid paper container. The window 30 is formed in a vertically long rectangle so that it can be seen regardless of the remaining amount of the contents. Further, two ridge ruled lines 29 are partitioned into an elliptical shape 33 so as to surround the window portion 30. The two ridge ruled lines 29 and the other side ridge ruled lines 28 can maintain the shape retention and handling of the paper container.

  FIG. 2 is an explanatory view showing an example of the blank of FIG. 1 (the window portion is stuck with a window pasting film). The window pasting film 10 is stuck on the window portion 30 so as to cover the entire surface from the sealant layer side. The window pasting film 10 needs to be arranged so as not to overlap the two ridge ruled lines 29. If they overlap, repulsion occurs when the ridge ruled lines are folded and assembled, and the shape retention of the paper container is impaired.

  FIG. 3 is an explanatory view showing an example of a gable top type liquid paper container by assembling the blank of FIG. 2 and the side plate 24 connected to the blank margin piece 25 are heat-sealed to form a sleeve (not shown), and then the bottom 23 is folded and heat-sealed. A cap 40 is heat-sealed into the hole 39 and filled with the contents, and then the top 21 is folded to form the gable-top liquid paper container 50. The window part 30 exists in the site | part of a side ridge ruled line, and can be visually recognized irrespective of the residual amount of the content. In addition, the shape retention of the paper container is maintained, and the cosmetic appearance by printing is not impaired.

  FIG. 4 is an explanatory diagram illustrating an example of the window portion 30 in the section of the elliptical shape 33 formed by the two ridge ruled lines 29. The window 30 has a width 31 and a height 35. The window pasting film 10 has a width 13 and a height 14. An elliptical shape 33 formed by two ridge ruled lines 29 has a horizontal width 34 and a height 35. The height 35 of the oval shape is equivalent to the height 38 of the ridge ruled line and the side ridge ruled line 28. Further, the square dimension 37 of the paper container is equal to the lateral width of the side plate 24. The window portion 30 has a width 31 of 10% of the square dimension 37 of the paper container and a height 32 of 90% of the height of the side ridge ruled line. The window 30 is provided at the center position in the section of the elliptical shape 33.

Further, the window pasting film 10 is formed so that the width 13 is 15% of the square dimension 37 of the paper container and the height 14 is 95% of the side ridge ruled line. Further, a partition is formed so as to surround the window portion 30 and the window pasting film 10 by two ridge ruled lines 29. The elliptical shape 33 formed by the two ridge ruled lines 29 has a width 34 that is 20% of the square dimension 37 of the paper container. Each ridge ruled line 29 is formed so that the curved line 36 at both ends has a radius of curvature R = 30 mm and the height 35 is equal to the side ridge ruled line 28. The shape shown in the figure.

  FIG. 5 is a cross-sectional explanatory view showing an example of the configuration of the laminate 1 of the present invention. It is comprised from the outer surface of the laminated body 1 in order from the polyethylene layer 2 / base material layer 3 / polyethylene layer 4 / intermediate layer 5 having a gas barrier property / polyethylene layer 7 / sealant layer 8.

  FIG. 6 is a cross-sectional explanatory view showing an example of the window pasting film 10 of the present invention. It is necessary to have a protection function almost the same as the contents protection function of the paper container. In particular, in terms of light shielding properties, it is ensured by making the window part a predetermined shape, but in terms of gas barrier properties, it is necessary to suppress the transmission of gas from the window part, particularly oxygen gas and water vapor. Therefore, for the window pasting film, a film substrate having excellent gas barrier properties, such as a film of polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, or polyethylene terephthalate, polyamide, polyvinyl alcohol, ethylene-vinyl acetate copolymer A film obtained by coating polyvinylidene chloride on a saponified material, a film obtained by vapor-depositing an inorganic compound such as silicon oxide or aluminum oxide, or a combination of one or more of these substrates can be used. In addition, in order to thermally bond the sealant layer to one side of the film substrate, a polyethylene film of a heat-fusible resin is formed and heat-sealed to form a window portion where the contents do not leak. Among the film base materials, a polyethylene terephthalate film in which aluminum oxide or silicon oxide is vapor-deposited as an inorganic compound is preferable from the viewpoint of processability. The window pasting film 10 is a composite film in which a sealant layer, a polyethylene film 11 to be heat-sealed, and a polyethylene terephthalate film 12 on which an inorganic compound is deposited are combined via an adhesive layer 4. Further, if it is necessary to further improve the strength of the composite film, a polyamide film may be further combined.

  FIG. 7 is a cross-sectional explanatory view showing an example of the configuration of the window portion of the present invention. The window pasting film 10 is stuck to the window portion 30 of the paper container from the sealant layer 8 side. The sealant layer 8 and the polyethylene film 11 are attached. The window pasting film 10 is pasted with a size that is 5% of the square size and 5% of the height of the ridge ruled line, and a large size as compared with the size of the window portion. The contents will not leak out.

  FIG. 8 is an explanatory view showing an example of the flat top type paper container of the present invention. It is the flat top type paper container 60 which has the window part 30 in the site | part of the side ridge ruled line of this invention. This is possible by folding the top portion 21 of the blank 20 into a flat top mold. The window part 30 is formed in the section of the elliptical shape 33.

  Hereinafter, embodiments for carrying out the present invention will be described in more detail.

The laminate 1 constituting the blank 20 has a paper basis weight of 200 to 500 g / m ² and a density of 0.6 to 1.1 g / cm ³ as the base material layer ³ , and the base material layer has heat-fusibility. The polyethylene film 2 which is the polyethylene layer 2 is bonded to the polyethylene layer 2 having a thickness of 15 to 30 μm as the outer surface layer having the outer surface layer by extruding and laminating a polyethylene resin with an extruder.

  The vapor deposition surface of the inorganic compound vapor deposition polyethylene terephthalate film which is the intermediate | middle layer 5 which has gas-barrier property is bonded together to the back surface of the base material layer 3 through the polyethylene layer 4 as an adhesive layer. Next, a sealant layer 8 is laminated on the polyethylene terephthalate film surface through a polyethylene layer 7 as an adhesive layer. As the polyethylene film of the sealant layer 8, a film having a thickness of 30 to 100 μm can be used.

  Laminate 1 is polyethylene layer 2 / base material layer 3 / polyethylene layer 4 / inorganic compound vapor deposition layer polyethylene terephthalate film 5 / polyethylene layer 7 / sealant layer 8 in order from the outer surface. This laminated body 1 is made into a roll shape or a sheet shape.

  As an example, the laminate 1 is matched with the shape of a gable top paper container, and a blank 20 is created. A fold line, outline removal, etc. can be processed by a generally known method. At this time, the window is also formed at the same time.

  The window pasting film 10 bonds the polyethylene film 11 to the surface of the inorganic compound vapor deposition layer of the inorganic compound vapor deposition layer polyethylene terephthalate film 12 through the adhesive layer 4. The polyethylene film 11 can be extruded and laminated with an extruder. Alternatively, the polyethylene film 11 prepared in advance can be bonded by dry lamination using a two-component reactive adhesive.

  This roll-shaped window pasting film is cut into a predetermined size. The sheet | seat of the cut window sticking film 10 is stuck so that the window part 30 may be covered (thermal fusion) from the sealant layer side of the said blank.

  The side ridge ruled line 28 and the ridge ruled line 29 are bent from this blank, and the side plate 24 connected to the adhesive margin piece 25 is heat-sealed to form a square cylindrical sleeve.

  In the filling machine, the bottom sleeve 23 is molded and closed, and then the plug 40 is heat-sealed to the plug mounting hole 39 to fill the contents, and the top 21 is molded and closed. To form a paper container. For example, if the top portion 21 is formed into a gable roof shape which is commonly called, a gobeltop paper container 50 can be formed.

  A pattern and characters are printed on the surface of the polyethylene layer 2 of the laminate 1. As a printing method, a normal method such as gravure printing, offset printing, inkjet printing, flexographic printing, or the like can be used. The surface can be subjected to corona treatment or the like to improve adhesion with the printing ink.

  Further, the present invention will be described in detail.

  The polyethylene layer 4 used for bonding the base material layer 3 and the inorganic compound vapor-deposited layer polyethylene terephthalate film is low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density. Polyolefin resin layers such as polyethylene (HDPE), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. The thickness may be in the range of 10 to 30 μm.

  The intermediate layer 5 can be made of a base material such as a polyethylene terephthalate film, a stretched polypropylene film, or an unstretched polypropylene film, or an aluminum compound deposited on a base material. As the inorganic compound, silicon oxide, aluminum oxide, magnesium oxide, or the like can be used. The thickness of the substrate is preferably 6 to 25 μm, the aluminum foil is 5 to 15 μm, and the thickness of the inorganic compound deposition layer is preferably 5 to 100 nm. The direction of the vapor deposition surface may be either the base material layer side or the sealant layer side. From the viewpoint of disposal after use, it is preferable to use an intermediate layer on which an inorganic compound is deposited. After use, it can be recycled waste.

The sealant layer 8 is composed of low density polyethylene (LDPE), linear low density polyethylene (L
LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE) and the like can be used, and may be a single layer or multiple layers. Linear low density polyethylene (LLDPE) is preferable. The thickness is preferably in the range of 30 to 100 μm.

  The gas barrier film 5 as an intermediate layer and the sealant layer 8 can be bonded together by a dry laminate through an adhesive in addition to the polyethylene layer 7 as an adhesive layer. As the adhesive, a two-component reaction type adhesive such as a polyurethane adhesive can be generally used. An intermediate layer of a gas barrier film and a sealant layer that have been dry-laminated in advance may be laminated by subjecting the base layer 3 to sand poly processing using the above polyethylene.

  Since the window pasting film 10 needs transparency, a film obtained by depositing the inorganic compound 6 on a base material such as a polyethylene terephthalate film, a stretched polypropylene film, or an unstretched polypropylene film can be used as the gas barrier film. As the inorganic compound 6, silicon oxide, aluminum oxide, magnesium oxide, or the like can be used. The thickness of the film substrate is preferably 6 to 25 μm, and the thickness of the inorganic compound deposition layer is preferably 5 to 100 nm. This gas barrier film is combined with a polyethylene film for heat-sealing with a sealant layer of a paper container. The polyethylene layer can be extruded and laminated by an extruder, or a polyethylene film prepared in advance can be bonded by dry lamination.

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

Polyethylene was extruded by 20 μm and laminated on the surface of a paperboard having a basis weight of 350 g / m ² . Next, as an intermediate layer having gas barrier properties, a polyethylene terephthalate film on which silicon oxide was deposited was used. The thickness of the vapor deposition layer of silicon oxide is 30 nm, and the thickness of the polyethylene terephthalate film is 12 μm. The back surface of the polyethylene terephthalate film and a linear low density polyethylene 60 μm as a sealant layer were bonded together by a dry lamination method using a polyurethane two-component adhesive to form a laminated film. The sealant layer was formed in advance by an extrusion method.

  Next, the back surface of the paperboard and the silicon oxide vapor deposition surface of the laminated film were laminated by sand-poly processing at a thickness of 30 μm using an ethylene-methacrylic acid copolymer (EMAA). A laminate was created.

  A blank for forming a 70-square gable top type paper container was prepared for 1 L of the prepared laminate. At the same time, the window portion was formed with a width of 10% of the width of 70 squares and a height of 90% of the side ridge ruled line at the site where a side ridge ruled line was formed at the same time as removing the outer shape. Further, a blank was formed so that the window portion was in an elliptical section equivalent to the ridge ruled line of 20% of the width and 70% of the width with two ridged ruled lines. In addition, the curvature radius R = 30mm was made into the both ends of each ridge ruled line.

  In this blank window part, a window pasting film is formed with a width of 15% with a 70-square width and a height of 95% of a side ridge ruled line so that the window does not overlap the two ridged ruled lines on the inner surface of the blank. A blank with a window pasting film was formed by heat sealing.

<Comparative Example 1>
A window pasted film was attached to form a blank with a window pasted film by adhering the window pasted film to a width of 70% of 30% and a height equivalent to the side ridge ruled line.

<Comparative example 2>
A blank having a window portion was formed as in Example 1. In this blank, the window portion is not partitioned by two ridge ruled lines. A window pasting film was formed on this window part to 30% of 70 square dimensions and the height to 95% of the side ridge ruled line, and was heat-sealed to the blank sealant surface. Thereafter, as in Example 1, the ridge ruled line was processed so that the window portion entered the compartment with two ridge ruled lines to form a blanket with a window pasting film.

  A sleeve is formed using the blank with a window pasting film formed in Example 1, Comparative Example 1, and Comparative Example 2, and a mineral water is filled with a filling machine to create a gable top type paper container having a content volume of 1 L and a 70 angle. did.

<Comparison result>
Each paper container was used to confirm the remaining amount of the contents, the shape of the paper container, and the handleability. Evaluation: ○: no problem, x: problem. Table 1 shows.

実施例１は、内容物の残量の視認性、紙容器の保形性、取り扱い性には問題がなく良好であった。しかし、比較例１は、窓貼りフィルムの貼着時に稜罫線部に浮きが生じた。また比較例２では、窓貼りフィルムを貼合わせ後の稜罫線加工において、バラツキが生じた。比較例１、２ともに紙容器の保形性、取り扱い性が良くなかった。よって窓貼りフィルムを、稜罫線に重ならないように配置することで、組み立て成形ができる。また紙容器として内容物の残量を問わず視認可能で、紙容器の保形性、取り扱い性に優れた液体用紙容器であった。

In Example 1, there was no problem in the visibility of the remaining amount of the contents, the shape retention of the paper container, and the handleability, and it was good. However, in Comparative Example 1, floating occurred in the ridge ruled line portion when the window pasting film was stuck. Moreover, in the comparative example 2, the variation produced in the ridge ruled line processing after bonding a window sticking film. In both Comparative Examples 1 and 2, the shape retention and handling properties of the paper container were not good. Therefore, assembly molding can be performed by arranging the window pasting film so as not to overlap the ridge ruled line. Further, it was a liquid paper container that was visible as a paper container regardless of the remaining amount of the contents, and was excellent in the shape retention and handling of the paper container.

  The liquid paper container of the present invention can be used for juices, soups, dairy beverages (soy milk, coffee milk, etc.), dairy products (whipped cream, etc.), alcoholic beverages (sake, shochu, plum wine, wine, etc.), beverages such as coffee, and foods. Can be used. It can also be used as a non-food product in perm liquids, detergents, softeners, building material waxes, and the like.

1 Laminate 2 Polyethylene layer (outer surface)
3 Base material layer 4 Polyethylene layer (adhesive layer)
5 Intermediate layer with gas barrier properties (inorganic compound-deposited polyethylene terephthalate film)
6 Inorganic compounds 7 Polyethylene layer (adhesive layer)
8 Sealant Layer 10 Window Pasting Film 11 Polyethylene Film 12 Inorganic Compound Deposition Polyethylene Terephthalate Film 13 Width of Window Pasting Film 14 Window Pasting Film Height 20 Blank 21 Top 22 Body 23 Bottom 24 Side Plate 25 Adhesive Strip 26 Folding Piece 27 Bottom piece 28 Side ridge ruled line 29 Ridge ruled line 30 Window part 31 Window part width 32 Window part height 33 Ellipse shape 34 Ellipse width 35 Ellipse height 36 Curve 37 Square dimension 38 Edge ruled line height 39 Mouth plug attachment hole 40 plug 50 liquid paper container of the present invention (gable top type)
60 Liquid paper container of the present invention (flat top type)
70 Blank with Conventional Window 80 Liquid Paper Container with Conventional Window (Gable Top Type)

Claims (6)

A laminate comprising paper as a base material layer and comprising an outer surface layer having heat-fusibility / base material layer / an intermediate layer having gas barrier properties / sealant layer (inner surface layer),
The top portion, the body portion, and the bottom portion, and the body portion is a rectangular cylindrical liquid paper container in which four side plates are formed through four side ridge ruled lines, respectively,
A rectangular window is formed in a portion where at least one side ridge ruled line of the side ridge ruled line is formed,
The window is pasted with a window pasting film that covers the entire surface from the sealant layer side,
A liquid paper container, wherein the window pasting film is provided in an elliptical section connected to each other by two ridge lines.   2. The liquid paper container according to claim 1, wherein the window portion has a width of 10% of the square dimension of the paper container and a height of 90% of the side ridge ruled line.   3. The liquid paper container according to claim 1, wherein the window pasting film has a width of 15% of a square dimension of the paper container and a height of 95% of the side ridge ruled line.   Each shape of the ridge ruled line is equal in height to the side ridge ruled line, both ends have a radius of curvature R = 30 mm, and the width of the elliptical shape connected opposite to each other is 20 mm, which is the square dimension of the paper container. The liquid paper container according to claim 1, wherein the liquid paper container is a percentage.   5. The liquid paper according to claim 1, wherein the window pasting film is a composite film including at least a polyethylene film and a polyethylene terephthalate film on which aluminum oxide or silicon oxide is deposited. container.   The liquid paper container according to claim 1, wherein the intermediate layer is a polyethylene terephthalate film on which aluminum oxide or silicon oxide is deposited.

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