JPH0777899B2 - Blank board for paper container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a paper container that does not deteriorate the quality of the internal filler, that is, a paper container having excellent quality retention characteristics. The present invention relates to a blank plate for a paper container, wherein a sticking portion of a paper container formed by the blank plate can be formed by a flame sealing method, and moreover, a quality retention characteristic for an internal filler and a sticking of the paper container. Provided is a blank plate for a paper container, which can be molded into a paper container having, for example, a Gobel top type, a brick type, or a cylindrical body, which has a property excellent in adhesive strength of a part.

[Prior Art] In a paper container, a sticking portion is formed by the heat-welding ability of a laminated sheet which is a material for molding the paper container. Generally, the inside of the paper container is in contact with the filling material. By the laminated sheet for a paper container whose peripheral layer is a polyolefin resin layer,
The adhesive portion is formed by utilizing the heat welding ability of the polyolefin resin layer in the laminated sheet for paper containers.

[Problems to be Solved by the Invention] By the way, a conventional paper container in which the inner peripheral surface layer of the container is formed of a polyolefin-based resin layer is used when manufacturing a laminated sheet for a paper container which is a molding material for the paper container. When forming the polyolefin resin layer, or in the step of box-making the paper container, the polyolefin resin undergoes thermal decomposition to produce volatile components such as aliphatic hydrocarbons. The sexual component is mixed in the filling material such as orange juice and sake filled in the paper container, which causes the quality of the filling material to deteriorate.

Furthermore, in the conventional paper container in which the container inner peripheral surface layer is formed of a polyolefin resin layer, the polyolefin resin layer forming the inner peripheral surface layer of the paper container is filled in the paper container. Since it has the property of adsorbing and permeating the aroma components contained in orange juice, etc., it is also a factor that further deteriorates the quality of the filling material such as orange juice filled in the paper container. .

On the other hand, the present invention is a paper container that does not deteriorate the quality of the internal filler such as orange juice and sake contained in the paper container, that is, a paper having excellent quality retention characteristics. A blank plate for a paper container to be formed in a container, and further, a portion to be stuck of the blank plate for the paper container has an excellent heat-welding ability, so that the adhesive strength of the sticking portion is excellent. A blank plate for a paper container that can be formed into a paper container having

[Means for Solving the Problems] The above object can be achieved by the blank plate for a paper container of the present invention having the following configuration.

That is, the present invention relates to a surface layer made of a polyolefin resin, an intermediate layer formed by laminating a paper layer and an aluminum foil located on the surface layer side, a stretched polyester resin film layer, a stretched ethylene-vinyl alcohol copolymer. A blank for a paper container comprising a laminated sheet for a paper container, comprising a resin film layer, and a back surface layer formed by any one of the drawn film layers selected from the stretched nylon film layers, the blank for the paper container. A heat-sealing resin layer having heat-sealing characteristics at a lower temperature than that of the resin forming the back surface layer is laminated in a region of the back surface layer related to the sticking portion of the paper container formed by the plate. It consists of a blank plate for a paper container.

The container body part of the paper container by the blank plate for a paper container of the present invention having the above-mentioned configuration, one side part of the blank plate for the paper container is superposed on the other side part, and the obtained superposition is obtained. It is obtained by heating and pressurizing the part to form an envelope pasting part in which the inner peripheral surface layer is composed of the back surface layer of the blank plate.

At this time, in the region of the back surface layer of the blank plate for the paper container related to the sticking part of the paper container, a heat-sealing resin having a heat-sealing property at a low temperature as compared with the resin forming the back surface layer. The layers are stacked.

Therefore, in the paper container using the blank plate for the paper container of the present invention, the portion of the sticking part of the paper container to which the back surface layer of the blank plate is related is at a low temperature laminated on the back surface layer of this portion. It is formed by the heat-welding ability of the heat-sealing resin layer having heat-sealing characteristics.

The back surface layer of the laminated sheet for a paper container forming the blank plate for a paper container of the present invention having the above-mentioned structure is a stretched polyester resin film layer, a stretched ethylene-vinyl alcohol-based copolymer resin film layer, and a stretched nylon film layer. It is composed of any one stretched film layer selected from among the above, and usually, in view of the stability of the stretched film layer, impact resistance, and the container forming characteristics of the resulting blank plate for paper containers, the thickness is The stretched film layer has a thickness of about 10 to 50 μm.

When the back surface layer is composed of a stretched ethylene-vinyl alcohol-based copolymer resin film layer having an ethylene content of more than 60 mol%, the back surface layer adsorbs an aromatic component in the filler. It is preferable to use a stretched film of an ethylene-vinyl alcohol copolymer resin having an ethylene content of less than 60 mol% because it tends to have a strong action.

When the back layer is made of a stretched polyester film or a stretched nylon film, a biaxially stretched film is preferable.

The back layer composed of a stretched polyester resin film layer, a stretched ethylene-vinyl alcohol copolymer resin film layer, and a stretched nylon film layer is a paper located on the front surface side. For an intermediate layer formed by laminating a layer and an aluminum foil,
Usually, they are laminated using an adhesive polyolefin resin or an isocyanate adhesive.

The intermediate layer positioned between the back surface layer and the surface layer of the paper container laminated sheet forming the paper container blank plate of the present invention is composed of a laminated structure of a paper layer and an aluminum foil, and the paper layer is the surface layer side. Are laminated so that the aluminum foil is located on the back surface layer side.

Further, the surface layer of the blank plate for the paper container of the present invention, for the paper container formed by the blank plate for the paper container, at the same time to add water resistance from the outside,
Among the back surface layer of the blank plate for a paper container described above, between the heat-sealing resin layer partially laminated in the region related to the sticking part, which also provides excellent heat welding performance, for example, Low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-α / olefin copolymer, further polypropylene, etc. Is formed to have a thickness of about 3 to 150 μm.

Further, in the blank plate for a paper container of the present invention, the heat-sealing resin layer laminated on one part of the back surface layer is heat-sealed at a lower temperature than the resin constituting the back surface layer. A resin having characteristics, for example, a urethane resin,
Polyethylene resin, polypropylene resin, adhesive polyester resin, polyamide resin, acrylic resin, polyvinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, polyvinyl acetate resin, polyvinyl alcohol resin, polyvinyl butyral resin, chlorinated polypropylene resin, Polystyrene resin, epoxy resin, polyurethane resin, cellulose derivative, polyester resin, phenol resin, xylene resin, urea resin, melamine resin, ketone resin, coumarone indene resin, petroleum resin, terpene resin, cyclized rubber, chlorinated rubber, alkyd resin , A natural resin, a natural resin derivative, or the like, having a thickness of about 20 to 100 μ.

The heat-sealing resin layer may be a single resin of the above-mentioned heat-sealing resin or a mixed resin of two or more kinds, for example, aliphatic hydrocarbons, aromatic hydrocarbons, alcohols,
Apply a coating agent obtained by dissolving in a single solvent or a mixed solvent consisting of esters, ketones, glycols, glycol derivatives, etc., to a predetermined part on the back surface layer of the laminated sheet for paper containers, and dry. Or by extruding and laminating the heat-sealing resin to the predetermined portion, and further transferring the heat-sealing resin layer laminated on the surface of the base film made of another material to the predetermined portion. Furthermore, after applying a corona discharge to a predetermined portion of the back surface layer, a ready-made extruded film made of a heat-sealing resin is used as an anchor coat layer, for example, an isocyanate-based, a butadiene-based, a urethane-based, an imine-based, titanium. It can be easily formed by a method such as laminating using an anchor coat layer of a system or the like.

This heat-sealing resin layer is between the polyolefin resin layer which is the surface layer of the blank plate for the paper container of the present invention,
Also, it has such a characteristic that the heat fusion bonding between the heat sealing resin layers can be performed by a flame sealing method.

[Example] Hereinafter, a specific configuration of the blank plate for a paper container of the present invention,
A description will be given based on examples.

Example 1 In FIG. 1, a low density polyethylene resin “Mirason 16sp” layer (surface layer) 3 having a thickness of 30 μ was formed on the surface of an acid resistant paper 2 having a basis weight of 400 g / m ² by an extrusion coating method, and On the back side, an adhesive layer 4 consisting of an ionomer resin “Mitsui DuPont Chemical Co., Ltd .: High Milan 1652” having a thickness of 30 μ was used, and an aluminum foil 5 having a thickness of 9 μ was used.
To the aluminum foil 5 side, and a thickness of 12μ
Biaxially stretched polyester film "Toyobo Co., Ltd .: Espet" layer (back surface layer) 6 is laminated using an isocyanate-based adhesive to obtain a laminated sheet used in the present invention as an example product. A laminated sheet 1 for a barrel paper container was obtained.

The stretched polyester film is composed of a stretched film using a polyester mixed resin to which an adhesive resin is added as a raw material for forming a film, and the surface thereof is subjected to corona discharge treatment. In FIG. 1, a portion indicated by reference numeral 7 is a laminated sheet 1 for a paper container.
Is an intermediate layer made of a base material for a packaging material.

Next, with respect to the back surface layer of the laminated sheet for a paper container, sticking of the paper container obtained when the laminated sheet is punched into a blank plate for a paper container of 380 x 370 mm and made into a Gobel-top type paper container Polyethyleneimine-based anchor coating agent "Nippon Shokubai Kagaku Co., Ltd .: Epomin p-"
1000 "polyethylene film having a thickness of 60μ coated on the back side is overlaid so that the anchor coating agent surface of the film and the corona discharge treated surface of the stretched polyester film in the above-mentioned laminated sheet for paper containers are in contact with each other. After they are combined, heating and pressurization at 240 ° C. are performed to form the heat-sealing resin layer 8 made of polyethylene film, and the pressing line for bending is formed at the portion indicated by the symbol m in FIG. Was formed.

Further, after cutting the laminated sheet 1 for a paper container into sheets, it is punched into a rectangular shape of 380 × 370 mm to obtain a paper container which is an embodiment of the present invention having the contour shape shown in FIG. A blank plate "i" was obtained.

In FIG. 2, the hatched portion is the area of the heat-sealing resin layer 8 laminated on the back surface layer 6 of the laminated sheet.

Example 2 A low-density polyethylene resin “Mirason 16sp” layer (surface layer) having a thickness of 30 μ was formed on the surface of acid-resistant paper having a basis weight of 400 g / m ² by an extrusion coating method. Using an adhesive layer consisting of a 30μ ionomer resin “Mitsui DuPont Chemical Co., Ltd .: Himilan 1652”, an aluminum foil having a thickness of 9μ is adhered, and further, a drawn ethylene having a thickness of 15μ is attached to the aluminum foil surface. A vinyl alcohol copolymer resin film "Kuraray Co., Ltd .: Eval XL" layer (back surface layer) is laminated by using an isocyanate-based adhesive to produce a laminated sheet according to one embodiment of the present invention. To obtain a laminated sheet for a paper container.

Then, with respect to the back layer (stretched ethylene-vinyl alcohol copolymer resin film layer) side of the laminated sheet for a paper container, the laminated sheet was punched out into a blank plate for a paper container of 380 x 370 mm to obtain a Gobel top type paper. A coating agent (a) having the following composition is applied and dried on a region which will be a sticking portion of a paper container obtained when the product is formed into a container, thereby forming a heat-sealing resin layer having a thickness of 60 μm. At the same time, a pressing line for folding which was used during box making was formed.

Coating agent (a) (1) Ethylene-vinyl acetate copolymer (vinyl acetate content 30%): 10 parts by weight (2) Microsilica: 1 part by weight (3) Toluene: ..... ... 89 parts by weight After that, the laminated sheet for a paper container is cut into sheets,
Furthermore, by punching into a rectangular shape of 380 × 370 mm,
Blank plate "ii" for a paper container, which is one embodiment of the present invention
Got

Preparation of paper container 1 In FIGS. 3 to 4, one side of the blank plate 10 for the two kinds of blank plates 10 for paper containers obtained in Examples 1 to 2 is used. After performing a scraping process on the side part 11 so that the surface layer 12 on the side part and a part of the paper layer on the intermediate layer 13 are omitted, the paper layer surface exposed by the scraping process is coated with a polyolefin adhesive. Further, the one side portion 11 is inverted to the surface layer 12 side of the blank plate 10, that is, the polyolefin adhesive surfaces are inverted so that they contact each other, and the contact portions of the inverted portion are adhered to each other. The skive hemming process was performed by pressure.

After that, the sticking part of the container body by flame sealing method,
The blank plate 10 is formed by superimposing the other side portion 14 on the one side portion 11 subjected to the above-mentioned skive hemming and heat-sealing, and the inner peripheral surface layer is the back surface layer 15 of the blank plate. A configured rectangular tube was obtained.

In addition, in FIGS. 3 to 4, a portion indicated by reference numeral 16 is a heat-sealing resin layer in the paper container blank plate 10.

The heat-sealing conditions of the body of the paper container by the flame sealing method are as follows: a first burner for pretreatment with a gas flow rate of 40 mmAq and a mixed gas amount of 300 mmAq, and a second burner with a gas flow rate of 50 mmAq and a mixed gas amount of 320 mmAq.
Using a burner, the conveyor speed was 130 m / min., And the flame treatment surface heating temperature was 240 ° C.

Further, the sticking portion of the container body by the flame sealing method is formed by superposing and pressurizing the flame-treated surfaces after the flame treatment. If the time lag between the pressure treatment and the pressure treatment is too large, the temperature of the joint surface at the time of pressurization is lowered, and the obtained seal strength is reduced. Therefore, it is preferable to set the time lag within 0.5 seconds.

Further subsequently, by a predetermined box-making process, by using the pressing line for bending in the blank plate 10, the part corresponding to the bottom of the container is bent, and the blank plate 10 is heat-welded in the overlapping parts of the containers, The bottom was molded.

After that, 1800 ml was placed in the rectangular tube whose bottom was blocked.
The inside of the container is filled with the orange juice of No. 1 and further, by using the pressing line m for bending in the blank plate, bending the portion corresponding to the top of the container and heat welding the overlapping portion of the blank plates. A paper container in which the peripheral surface layer is constituted by the back surface layer of the blank plate for a paper container, that is, the width of 8, which is indicated by symbol A in FIG.
A Gobel-top type rectangular parallelepiped paper container having a size of 5 cm, a depth of 8.5 cm and a height of 30 cm was obtained.

When each of the obtained paper containers was subjected to a drop test in which the paper container was dropped from 1.2 m above the floor, liquid leakage did not occur at all in the heat-bonded portion of the paper container.

However, from among the blank plates for each paper container of Examples 1 to 2 described above, a blank plate for a paper container for comparison having a configuration in which the configuration of each heat-sealing resin layer is omitted is used, In the case of the paper container obtained by adhering the container body by the flame sealing method which is exactly the same as the method for forming the paper container, liquid leakage occurred at the sticking part of the container body.

Example 3 In FIG. 6, with respect to the back surface of the laminated sheet for a paper container having the same configuration as the laminated sheet for a paper container 1 used in obtaining the blank plate “i” for a paper container in the above Example 1, The polyethyleneimine-based anchor coating agent "Nippon Catalysis Chemical Co., Ltd." was applied to the part of the adhesive sticking part of the paper container obtained by punching it into a 380 x 370 mm blank plate for paper containers and making it into a Goebeltop type paper container. ): Epomin p-1000 ”is applied to the back surface of a polyethylene film having a thickness of 60 μ, and the anchor coat agent surface of the film and the corona discharge treated surface of the stretched polyester film in the above-mentioned laminated sheet for paper containers are treated. After superposing so that they are in contact with each other, heating and pressurization at 240 ° C. are performed to form a heat-sealing resin layer of the polyethylene film, and The pressing line n for folding used when forming the box was formed.

Furthermore, after cutting this laminated sheet for paper containers into sheets, it is punched into a rectangular shape of 380 × 370 mm to obtain a sixth sheet.
A blank plate "iii" for a paper container, which is one example product of the present invention having the contour shape shown in the drawing, was obtained.

The shaded portion in FIG. 6 is the area of the heat-sealing resin layer formed on the back surface layer of the blank plate “iii” for the paper container.

Example 4 The back surface layer (stretched ethylene-vinyl alcohol copolymer resin) of the laminated sheet for a paper container having the same structure as the laminated sheet for a paper container used for obtaining the blank sheet “ii” for a paper container in the above-mentioned Example 2. Film layer) surface, the laminated sheet is punched into a blank 380 × 370 mm paper container for paper containers and a part to be a sticking part in the paper container obtained when the product is boxed into a Gobel-top type paper container, A coating agent having the same composition components as the coating agent (a) used in Example 2 is applied and dried to form a heat-seal resin layer having a thickness of 60 μ, and is used for folding at the time of box making. Of pressure line.

Furthermore, after cutting the laminated sheet for a paper container into sheets,
A blank plate “iv” for a paper container, which is an example of the present invention, was obtained by punching into a rectangular shape of 380 × 370 mm.

Manufacture of paper container 2 In FIG. 7, 2 obtained in Examples 3 to 4 was used.
For each type of blank plate 20 for a paper container, one side 21 of the blank plate 20 has a laminated sealing tape a shown in FIG. 8, that is, an aluminum foil having a thickness of 20 μm. 20 μm thick polyolefin resin “Mirason 16p: manufactured by Mitsui Petrochemical Co., Ltd.” on the front and back surfaces of the core layer b made of a laminated sheet of a biaxially stretched polyethylene terephthalate resin film having a thickness of 12 μm 91 μ in thickness and width obtained by laminating the front surface layer c and the back surface layer d according to
A 24 mm sealing tape a was adhered to obtain a blank plate for a paper container in which one side portion 21 was end-face treated with the sealing tape a.

It should be noted that the end surface treatment of the one side portion 21 with the sealing tape a is performed by applying the sealing tape a to the one side portion 21 and one side portion of the sealing tape a to the surface layer c side. So that the back surface layer d in the reversal portion having a width of about 5 mm and the back surface layer 25 in the one side portion 21 of the blank plate 20 for a paper container come into contact with each other. The front surface layer 22, the rear surface layer 25, and the end surface 27 on one side 21
After being wound so as to be covered with the sealing tape a, the contact portions of the wound sealing tape a and the one side portion 21 are placed above and below the contact portion.
It was carried out by heating the heated surface to 300 ° C. while applying a pressure of ² kg / cm ² while applying a 320 ° C. heat bar.

Further subsequently, the sealing tape a surface adhered to the surface layer 22 side of the one side portion 21 of the blank plate 20 for a paper container whose end surface is treated with the sealing tape a, and the other side edge After the back surface layer 25 of the portion 24 is subjected to the flame treatment, respectively, the other side portion 24 is superposed on the one side portion 21, and the superposed portion is pressed, as shown in FIG. 9. An envelope pasting portion was formed, and a rectangular tubular body having an inner peripheral surface layer composed of a back surface layer 25 was obtained.

In FIG. 9, the portion indicated by the reference numeral 26 is the area of the heat-sealing resin layer in the paper container blank plate.

The heat-sealing conditions for the above-mentioned flame-sealing method for the body of the paper container are as follows: the first burner for pretreatment with a gas flow rate of 40 mmAq and a mixed air amount of 300 mmAq, a gas flow rate of 50 mmAq, and a mixed air amount of 320 mmAq.
Conveyor speed 130m / mi with the second burner of q
The heating temperature of the flame treated surface is 240 ° C.

Further subsequently, by a predetermined box making process, by using the pressing line for bending in the blank plate 20, the part corresponding to the bottom of the container is bent, and the blank plate 20 is heat-welded at the overlapping parts of the containers, The bottom was molded.

After that, in the rectangular cylinder whose bottom is closed,
The inside of the container is filled with 1800 ml of sake by using the pressing line m for folding the blank plate and bending the part corresponding to the top of the container and heat-sealing the overlapping parts of the blank plates. The lateral width of the peripheral layer is composed of the back layer in the blank plate for the paper container 8.5 cm,
A Gobel-top type rectangular parallelepiped paper container having a depth of 8.5 cm and a height of 30 cm was obtained.

When each of the obtained paper containers was subjected to a drop test in which the paper container was dropped from 1.2 m above the floor, no liquid leakage occurred at the heat-bonded portion of the paper container.

However, from among the blank plates for each paper container of Examples 3 to 4, a blank plate for a paper container for comparison, which has a configuration in which the configuration of each heat-sealing resin layer is omitted, is used. In the case of a paper container obtained by adhering the body of the container by the flame sealing method exactly the same as the method for forming a paper container of No. 3, liquid leakage occurred at the sticking part of the body of the container.

Example 5 In FIG. 10, the back surface (biaxially stretched polyester) of a laminated sheet for a paper container having the same structure as the laminated sheet 1 for a paper container used in obtaining the blank plate “i” for a paper container in Example 1 Corona discharge treated surface of the film), the part which becomes the sticking part of the paper container obtained when the laminated sheet is punched into a blank plate for a paper container of 380 x 370 mm and made into a Gobel top type paper container In addition, polyisocyanate-based anchor coating agent "Sumitomo Chemical Co., Ltd .: Sumidule L-"
75, 10 parts by weight, Sanyo Chemical Co., Ltd .: Yunoflex E, 10
Parts by weight, and 200 parts by weight of ethyl acetate "is applied to the back surface of a polyethylene film having a thickness of 60μ, and the anchor coat agent surface of the film and the corona discharge treatment in the stretched polyester film in the above-mentioned laminated sheet for paper containers. After superposing them so that they are in contact with the surface, heating and pressurizing at 240 ° C. form a heat-sealing resin layer by the polyethylene film, and a pressing line for bending that is used during box making. Was formed.

Furthermore, after cutting this laminated sheet for paper containers into sheets,
By punching into a rectangular shape of 380 x 370 mm, a blank plate "v" for a paper container, which is one embodiment of the present invention to be boxed in a paper container for filling sake, was obtained.

In addition, the hatched portion in FIG. 10 is the area of the heat-sealing resin layer formed on the back surface layer of the blank plate “v” of the paper container, and the width with respect to the right side portion. L1 ...... 20 mm part, and the width L2 ...... 10 mm part to the left side part, and further the planned adhesion part for forming the bottom part and the planned adhesion part for forming the Gobel type top part,
A heat-sealing resin layer is formed on each.

Example 6 In FIG. 11, the back surface (biaxially stretched) of a laminated sheet for a paper container having the same configuration as the laminated sheet 1 for a paper container used in obtaining the blank plate “i” for a paper container in the above Example 1 For the corona discharge treated surface of the polyester film), the laminated sheet is punched into a blank 380 × 370 mm paper container blank to form an adhesive part of the paper container obtained when the product is made into a Gobel-top type paper container. A polyester resin "Unitika Co., Ltd .: XA-4026" is extrusion-coated on the part to form a heat-sealing resin layer with a thickness of 60μ, and at the same time, a pressing line for bending that is used during box making is used. Formed.

Furthermore, after cutting the laminated sheet for a paper container into sheets,
A blank plate “vi” for a paper container, which is an example of the present invention, was obtained by punching into a rectangular shape of 380 × 370 mm.

The shaded portion in FIG. 11 is the area of the heat-sealing resin layer formed on the back surface layer of the blank plate “vi” for the paper container, with respect to the right side portion, Width L3 ...... 20 mm part, to the left side part, width L4 ...... 10 mm part, and further the planned adhesion part for forming the bottom part and the adhesion planned part for forming the Gobel type top part,
A heat-sealing resin layer is formed on each.

[Operations and Effects of the Invention] A blank plate for a paper container of the present invention comprises a surface layer made of a polyolefin resin, an intermediate layer formed by laminating a paper layer positioned on the surface layer side and an aluminum foil, and a stretched polyester. Paper comprising a laminated sheet for a paper container having a resin film layer, a stretched ethylene-vinyl alcohol-based copolymer resin film layer, and a back surface layer of any one stretched film layer selected from a stretched nylon film layer. In a blank plate for a container, in the region of the back surface layer related to the sticking part of the paper container molded by the blank plate for a paper container, heat sealing at a lower temperature than that of the resin forming the back surface layer is performed. The heat-sealing resin layer having characteristics is laminated.

Therefore, the sticking portion of the portion directly involved with the back surface layer of the blank plate can be formed by utilizing an extremely efficient flame sealing method, and the obtained paper container has an inner peripheral surface layer thereof, Since it is composed of any one stretched film layer selected from a stretched polyester resin film layer, a stretched ethylene-vinyl alcohol-based copolymer resin film layer, and a stretched nylon film layer,
The resin layer forming the inner surface of the container does not adsorb or permeate the fragrance component contained in the paper container, and the low molecular weight component from the resin layer forming the inner surface of the container into the inner filling. Since it does not elute, the paper container has a long-term quality retention characteristic without losing the aroma component contained in the paper container.

In particular, a blank plate for a paper container having a heat-sealing resin layer indicated by a symbol h1 in FIG. 12 and a symbol in FIG.
A blank plate for a paper container having a heat-sealing resin layer indicated by h2, that is, a blank plate for a paper container in which the heat-sealing resin layer is formed to extend with respect to the planned bonding portion, is obtained. The positions of the end faces of the heat seal layers of the sticking part of the paper container are displaced from each other, and the position of the end face of the sticking part between the heat sealing layer of the sticking part and the back surface layer of the blank plate is different from each other. Therefore, when the peeling action is applied, the action is dispersed, so that the paper container has a sticking portion having a strong resistance to the peeling action.

[Brief description of drawings]

FIG. 1 is a model cross-sectional view of one embodiment of a blank plate for a paper container of the present invention, and FIG. 2 is a plan view of a portion punched into one embodiment of a blank plate of a paper container of the present invention. FIG. 3 is a model cross-sectional view showing a state of an end surface treatment of one side portion of the blank plate when the blank part of the paper container is obtained by the blank plate for the paper container, and FIG. 4 is a blank for the paper container. A model cross-sectional view showing an embodiment of an envelope pasting part formed by a plate,
FIG. 5 is a perspective view showing one embodiment of a paper container formed by a blank plate for a paper container, and FIG. 6 is a part of a blank plate for a paper container of the present invention which is punched into one embodiment. A plan view and FIG. 7 are model cross-sectional views showing a state of end face treatment of one side portion of a blank plate when a blank part for a paper container is obtained by a blank plate for a paper container, and FIG. 9 is a model cross-sectional view showing an embodiment of a sealing tape used for end face treatment of one side portion of the blank plate of FIG. 9, and FIG. 9 is an envelope in a paper container body in which the sealing tape is interposed. FIG. 10 is a plan view of a portion of the pasted part, which is a blank plate for a paper container of the present invention, which is punched into an embodiment, and FIG. 11 is a blank plate for a paper container of the present invention. Fig. 12 is a plan view of the punched part of the product of Fig. And model cross-sectional view showing another embodiment of the envelope bonded portion is, FIG. 13 is a model sectional view of another embodiment product of the envelope bonded portion in the paper container body that is interposed a sealing tape. 1: laminated sheet for paper container, 3: front surface layer made of polyolefin resin, 6: back surface layer, 7: intermediate layer, 8: heat sealing resin layer made of resin having heat sealing property at low temperature, i: paper container Blank board for.

Claims (1)

[Claims] 1. A surface layer made of a polyolefin resin, an intermediate layer formed by laminating a paper layer located on the surface layer side and an aluminum foil, a stretched polyester resin film layer, and a stretched ethylene-vinyl alcohol copolymer. A blank for a paper container comprising a laminated sheet for a paper container, comprising a resin film layer, and a back surface layer formed by any one of the drawn film layers selected from the stretched nylon film layers, the blank for the paper container. A heat-sealing resin layer having heat-sealing characteristics at a lower temperature than that of the resin forming the back surface layer is laminated in a region of the back surface layer related to the sticking portion of the paper container formed by the plate. A blank plate for a paper container, which is characterized in that