JP2012025470A - Paper-made container, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper-made container that prevents barrier-property losing trouble due to split at a ruled crease line in a flange or break of a formed film, and has partition sheets enabling filling of two or more kinds of contents.SOLUTION: The paper-made container is composed of: an inner paper box made from one sheet of blank, whose bottom, side surfaces, flanges and the partition sheets are connected via ruled crease lines, respectively; an inner surface resin film larger than the inner surface of the inner paper box, which is laminated on the inner surface of the inner paper box; an outer paper box made from one sheet of blank, whose bottom, side surfaces, flanges and the partition sheets are connected via ruled crease lines, respectively; and an outer surface resin film larger than the outer surface of the outer paper box, which is laminated on the outer surface of the outer paper box. Here, the outer surface of the inner paper box is put on the inner surface of the outer paper box and the peripheries of the inner surface resin film, and the outer surface resin film are stuck together in which ruled crease lines are formed from the inner surface side of the inner paper box. The ruled crease lines as boundaries between the side surfaces and the flanges of the outer paper box are formed from the outer surface side of the outer paper box.

Description

  The present invention relates to, for example, a paper container used for the distribution of food, meals, and toiletries, and is excellent in functions such as barrier properties, water resistance, and retort resistance, and is filled with a plurality of types of contents. The present invention relates to a paper container and a manufacturing method thereof.

  In a paper container used as a primary container for foods and toiletries, the contents are directly stored in the paper container, so the contents and the inner surface of the paper container are in direct contact. As such a primary container, a paper container in which a thermoplastic sheet is laminated on the inner surface of a paper box is used (see Patent Document 1).

  However, since this paper container has a thermoplastic sheet laminated only on the inner surface of the paper box, the outer surface of the paper box is not waterproof and the outer surface of the paper box when sterilizing or cooking with hot water. Had the problem of water absorption. When the outer surface of the paper box absorbs water, delamination of the paper occurs, and the paper container is deformed due to a decrease in strength, and when the outer surface of the paper box is a printed layer, the nickname and lack of necessary information due to the peeling of the printed layer Various problems occur.

  Moreover, in a normal paper container, a paper box is manufactured using a blank, and the flange connected to the upper edge of the four side surfaces of the paper box has a structure in which adjacent flanges overlap each other by overlapping flange pieces, and the upper surface of the flange is A level difference of one sheet occurs. It has been pointed out that when a lid member is bonded to the upper surface of a flange having a step, problems such as leakage of contents due to the step and a decrease in the bonding strength of the lid member occur.

  In order to cope with the problem, it has been proposed that resin films are laminated on the inner and outer surfaces of a paper box composed of an inner paper box and an outer paper box to give resistance not only to the inner surface of the paper container but also to the outer surface. According to this, since the inner surface resin film and the outer surface resin film are bonded so as to cover the paper box, water absorption from the end surface of the flange is also prevented, deformation due to a decrease in strength of the paper container due to delamination of the paper, and the paper box Even when there is a printed layer on the outer surface, various problems such as aesthetics due to peeling of the printed layer and loss of necessary information do not occur. Therefore, it is excellent in functions such as barrier properties, water resistance, and retort resistance. Further, when the paper container is heat-sealed with the lid, no sealing failure such as seal leakage occurs, and air does not collect between the paper box and the resin film (see Patent Document 2).

  Also, there is a phenomenon that even if the flange is bent during box making, the film breaks during molding, and when box making, the ruled line breaks in the flange part, breaking the molded film and eliminating the barrier property There was a problem that would occur. In order to solve this, a paper made of an inner paper box in which an inner resin film is laminated on the inner surface and a crease line is provided from the inner surface side, and an outer paper box in which an outer resin film is laminated on the outer surface from the lower outer surface side is provided. A container has been proposed (see Patent Document 3).

  However, since there is no partition plate in the container, a plurality of types of contents cannot be filled. Until now, it was filled in separate containers or small packages, but this led to increased costs.

JP-A-9-254280 Japanese Patent Application No. 2009-246409 Japanese Patent Application No. 2010-162719

  In order to solve the above-mentioned problems, the present invention provides a folding in the inner paper box so that a plurality of contents can be filled as a partition plate. May cause problems that break through the molded film and lose the barrier properties, and has excellent functions such as barrier properties, water resistance, retort resistance, and heat sealed paper containers with the lid It is an object of the present invention to provide a paper container having a partition plate that can be filled with a plurality of types of contents, and a method of manufacturing the same.

  As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that the bottom portion, the trunk portion, the flange portion, and the partition plate are continuously arranged by a crease line, and an inner paper box consisting of a single blank, An outer paper box and an outer paper box made of a single blank, in which the inner resin film, which is laminated on the inner surface of the inner paper box, is larger than the inner surface of the inner paper box, and the bottom, body, flange, and partition plate are connected by crease lines. An outer surface resin film larger than the outer surface of the outer paper box laminated on the outer surface of the inner paper box, the outer surface of the inner paper box and the inner surface of the outer paper box are overlapped, and the peripheral portion of the inner surface resin film and the outer surface resin film are bonded together. The folded ruled line is formed from the inner surface side of the inner paper box, and the folded ruled line that forms the boundary between the body portion and the flange portion of the outer paper box is formed from the outer surface side of the outer paper box. A paper container according to claim.

  In the invention according to claim 2, the partition plate of the inner paper box has a ruled line from the inner surface side of the inner paper box, folds the mountain when the central portion of the inner paper box is viewed from the inner surface side, and the bottom portion is a valley. The paper container according to claim 1, wherein the paper container is formed by folding.

  The invention according to claim 3 is characterized in that the inner paper box or the outer paper box has a flange, the ruled line is formed from the inner surface side of the inner paper box, and the ruled line of the flange portion is folded in a mountain. 2. A paper container according to 2.

  Further, in the invention according to claim 4, the inner paper box having the flange is formed by boxing a single blank, and the flanges at the upper edge of the four regular surfaces of the paper box have the end portions of adjacent flanges. The paper container according to any one of claims 1 to 3, wherein the paper containers are butted and do not overlap each other.

  The invention according to claim 5 includes a step of laminating an inner surface resin film larger than an inner surface of the inner paper box on an inner surface of the inner paper box, a step of overlapping the outer surface of the outer paper box and the inner surface of the outer paper box, and the inner surface A method for producing a paper container, comprising a step of bonding a resin film and a peripheral portion of an outer resin film.

  In the invention according to claim 6, the step of laminating an inner surface resin film larger than the inner surface of the inner paper box on the inner surface of the inner paper box is performed by forming the inner edge resin film in a mold by a vacuum molding method and / or a pressure forming method. The method for producing a paper container according to claim 5, wherein the method is a step of laminating the inner paper box installed on the paper container.

In the invention according to claim 7, the step of laminating an outer surface resin film larger than the outer surface of the outer paper box on the outer surface of the outer paper box is carried out by placing the outer surface resin film in a mold by a vacuum molding method and / or a pressure molding method. 6. The method for manufacturing a paper container according to claim 5, wherein the method is a step of laminating the installed outer paper box.

  An inner surface resin film 3 larger than the inner surface of the inner paper box 2 is laminated on the inner surface of the inner paper box 2, and a partition plate 17 is provided in the inner paper box from the inner surface side of the inner paper box. When viewed from the top, the bottom portion is folded in a valley, while the outer surface of the outer paper box 5 is laminated with an outer surface resin film 4 larger than the outer surface of the outer paper box 5, and the outer surface of the inner paper box 2 and the inner surface of the outer paper box 5 are By bonding the peripheral portions of the inner surface resin film 3 and the outer surface resin film 4 so as to overlap, water resistance is imparted not only to the inner surface of the paper container 1 but also to the outer surface, and the inner surface resin film 3 and the outer surface resin film. Since 4 is laminated so as to cover the inner paper box 2 and the outer paper box 5, water absorption from the end surface of the paper does not occur, and strength deterioration due to water absorption of the paper does not occur. Is possible.

  An inner surface resin film 3 larger than the inner surface of the inner paper box 2 is laminated on the inner surface of the inner paper box 2, and an outer surface resin film 4 larger than the outer surface of the outer paper box 5 is laminated on the outer surface of the outer paper box 5. And the inner surface of the outer paper box 5 are overlapped, and the peripheral portions of the inner resin film 3 and the outer resin film 4 are bonded to each other, so that air does not collect between the paper box and the resin film. No tearing will occur.

  Further, an inner surface resin film 3 larger than the inner surface of the inner paper box 2 is laminated on the inner surface of the inner paper box 2, and the inner surface resin film 3 is laminated on the inner paper box 2 installed in the molding die 12 by a vacuum forming method and / or a pressure forming method. Since the inner surface resin film 3 is brought into close contact with the inner paper box 3 by the vacuum forming method and / or the pressure forming method, the inner surface resin film 3 is accurately laminated so as to follow the shape of the inner paper box 2. be able to.

  Further, an outer surface resin film 4 larger than the outer surface of the outer paper box 5 is laminated on the outer surface of the outer paper box 5, and the outer surface resin film 4 is laminated on the outer paper box 5 installed in the molding die 12 by a vacuum forming method and / or a pressure forming method. Since the outer surface resin film 4 is brought into close contact with the outer paper box 5 by the vacuum forming method and / or the pressure forming method, the outer surface resin film 4 is accurately laminated so as to follow the shape of the outer paper box 5. be able to.

  The inner paper box 2 is provided with a crease line 10 from the inner surface side, whereby the upper part of the partition plate 17 and the ruled part of the flange part 7 are fold-folded, and the shape of the folded upper part of the partition board 17 and the flange part 7 is easily maintained. On the other hand, the lower part of the partition plate 17 and the body part 15 of the inner paper box 2 are valley-folded by inserting the crease line 10 from the inner surface side, and the lower part of the cut plate 17 and the body part 15 are likely to return to the original shape. Since the outer paper box 4 is provided with the crease lines 10 from the outer surface side, the shape of the folded body part 15 is easily maintained, and the outer paper box 5 suppresses the force that the inner paper box 2 spreads, so that the formability is improved.

  When the folded ruled line 10 is formed from the outside of the inner paper box blank 18 having the partition plate, the original shape is easily restored even when the lower portion of the partition plate 17 and the flange portion 7 are folded. Therefore, in the box making process, the partition plate 17 and the flange portion 7 are damaged, and there are problems such as pinholes opening in the film. In the present invention, since the inner paper box 2 has a folded ruled line 10 from the inside, when returning to the original, the flange portion 7 of the outer paper box 4 is pressed against the flange portion 7 of the inner paper box 2, so the bottom of the inner paper box 2 is bent. Even if the partition plate 17 is formed, it is possible to fill a plurality of types of contents while maintaining the moldability and solving the problems such as pinholes opening in the film.

According to the present invention, it is possible to reduce waste waste, which is a problem in a paper composite container having a barrier function, heating in a microwave oven, use as a container, and there is no risk of cracking etc. The moldability is improved by suppressing the return of the flange while holding the film, preventing the loss of the barrier property due to the tearing of the molded film due to the ruled line cracking in the flange part in the box making process. A paper container having a partition plate that can be filled can be provided.

1 is a perspective view of a paper container 1 according to an embodiment of the present invention. Sectional drawing in the AA 'line of the paper container 1 shown in FIG. The top view which shows an example of the inner paper box blank with a partition plate used by this invention The top view which shows an example of the outer paper box blank used by this invention Sectional drawing of the shaping | molding die explaining the manufacturing method of the paper container 1 which concerns on embodiment of this invention Explanatory drawing of the manufacturing process of the paper container 1 which concerns on embodiment of this invention. Sectional drawing which showed the state of the partition plate which put the ruled from the inner surface side of the inner paper box of this invention, and a flange part Sectional drawing which showed the state of the flange part which ruled from the outer surface side of the outer paper box of this invention Sectional drawing which put the ruled from the inner surface side of the inner paper box of this invention, and showed the state of the trunk Sectional drawing which showed the state of the trunk | drum which put a rule from the outer surface side of the outer paper box of this invention Sectional drawing which showed the swell of the ruled line part of each inner paper box and outer paper box which gave the ruled line of this invention

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a paper container 1 having a partition plate according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA ′ of the paper container 1 shown in FIG.

  As shown in FIGS. 1 and 2, the paper container 1 of the present invention has an inner resin film 3 laminated on the inner surface of an inner paper box 2 with a partition plate 17 and a flange portion 7. The outer surface resin film 5 is laminated on the outer surface, the outer surface of the partition plate 17 and the inner paper box 2 with the flange portion 7 and the inner surface of the outer paper box 4 with the flange portion 7 are overlapped, and the peripheral portions of the inner surface resin film 3 and the outer surface resin film 5 are overlapped. It is fused and integrated.

  The partition plate 17 and the inner paper box 2 with the flange portion 7 and the outer paper box 4 with the flange portion 7 are formed by bonding cardboard and paperboard, and bonding them with a resin film layer, a metal layer, or the like, or a box shape. However, it is not limited to these. Moreover, although the paper container 1 shown in FIG. 1 is a square tray structure with a shallow bottom, the structure is suitably changed according to the purpose and conditions to be used.

  FIG. 3 shows an example of the blank 18 of the inner paper box 2 having the partition plate 17 and FIG. 4 shows an example of the blank 6 of the outer paper box 5. Inner paper box 2 and outer paper box 5 are formed from blank 18 and blank 6, and sufficient strength and shape stability are imparted by laminating inner resin film 3 and outer resin film 4 on both the inner and outer surfaces of the paper box. can do. At this time, it is possible to receive a plurality of partition plates 17 instead of one.

  FIG. 5 shows a method of manufacturing the paper container 1. The inner paper box 2 and the inner surface resin film 3 are laminated on the mold 12 and integrated by the heater 11. At this time, the film is preferably laminated by a deep drawing method, particularly a vacuum forming method and / or a pressure forming method.

When the above-described paperboard is used as a material constituting the inner paper box 2 and the outer paper box 4, for example, when a blank made of paperboard is box-shaped, it is necessary to fasten the overlapping pieces 16 using an adhesive member. . Adhesive members here include vinyl acetate water-based adhesives, hot melt, ethylene / vinyl acetate copolymer resin (EVA), vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer resin ( EAA), modified olefin heat seal varnish, and the like can be used.

Examples of the inner resin film 3 and the outer resin film 5 include polyethylene such as low density polyethylene (LDPE), medium density polyethylene, linear low density polyethylene (LLDPE), or a copolymer resin (EAA) of ethylene and acrylic acid, The modified resin, polypropylene (PP) such as homopolypropylene, random polypropylene copolymer, block polypropylene copolymer, nylon such as 6 nylon, 66 nylon, MXD-6 nylon, and ethylene vinyl alcohol (EVOH) ) Resins and resins such as polyvinylidene chloride (PVDC) can be used.
These can be used in a single layer or a combination of multiple layers. The film thickness of each resin film after being laminated on the paper container 1 is preferably 30 μm or more and 500 μm or less. When the film thickness is thicker than 500 μm, the film thickness may be non-uniform during lamination, which is not preferable. Moreover, if it is less than 30 μm, there is a high risk of pinholes occurring in the resin film.

  The paper container 1 according to the present invention is manufactured as follows. First, a blank 18 as shown in FIG. 3 is assembled in the inner paper box 2. The blank 18 includes a bottom surface 8, a side surface 9, a partition plate 17, and a flange 7 connected to the upper end edge of the side surface. The inner paper box 2 is assumed.

  A blank 6 as shown in FIG. 4 is assembled in the outer paper box 5. The blank 6 includes a bottom surface 8, a side surface 9, and a flange 7 connected to the upper edge of the side surface. The blank 6 is formed by punching out a blank 6 made of paper. To do.

  Here, in the present invention, it is preferable that the flanges 7 connected to the upper edge of the four side surfaces of the paper box are abutted at the ends of the adjacent flanges 7 when assembled, and do not overlap each other. Sufficient strength and shape stability can be imparted by laminating resin films on both the inner and outer surfaces of the paper box.

  Next, the inner surface resin film 3 is laminated on the inner surface of the inner paper box 2. In order to laminate the inner surface resin film 3 on the inner paper box 2, it is preferred that the inner resin film 3 is laminated by a deep drawing method, in particular, a vacuum forming method and / or a pressure forming method.

  As shown in FIG. 5, the assembled inner paper box 2 is set in a mold 12, and the inner surface resin film 3 is placed on the inner paper box 2. The flange portion 7 of the inner paper box 2 with the flange portion 7 and the inner surface resin film 3 are adhered by a method such as heat sealing (pre-sealing), and at the same time, the inner surface resin film 3 is heated and softened using the heater 11 (pre-heating up). The heat bonding conditions, hot air temperature, and the like are appropriately changed depending on the material, thickness, and the like of the inner surface resin film 3 to be used.

Next, as shown in FIG. 6, the inner paper box 2 having the partition plate 17 on which the inner surface resin film 3 is laminated and the outer paper box 5 on which the outer surface resin film 4 is laminated so that the inner paper box 2 and the outer paper box 5 are in contact with each other. To overlay.
Thereafter, when air is sucked from the lower part of the mold 12 through a suction tube and a suction hole 13 from a vacuum source such as a vacuum pump, the air in the mold is between the side surfaces of the inner paper box 2 with the flange portion 7 or a breathable paper layer. The inner resin film 3 that has been heated and softened is bent by pressure and is closely formed on the inner surface of the partition plate 17 and the inner paper box 2 with the flange portion 7. It is formed integrally with the inner paper box 2 with the flange portion 7 (vacuum forming method).

FIG. 7 shows a state of the partition plate 17 and the flange portion 7 in which the folded ruled line 10 is inserted from the inner surface side of the inner paper box 2, and the partition plate 17 is mountain-folded by viewing the central portion of the inner paper box 2 from the inner surface side. The part that becomes is folded and formed. The flange portion 7 is folded in a mountain, the opposite side where the folded ruled line 10 is formed swells, and the shape of the bent flange portion 7 is easily maintained. The flange portion 7 of the inner paper box 2 which is valley-folded requires that the crease portion bulge 14 of the crease ruled line 10 comes to the outside of the paper box. FIG. 8 shows a state of the flange portion 7 with a ruled line from the outer surface side of the outer paper box 5. The flange portion 7 is valley-folded, the opposite side where the folded ruled line 10 is formed swells, and the bent flange portion 7 has the original shape. Easy to return to.

  FIG. 9 shows a state of the bottom of the partition plate 17 and the body portion 15 where the folded ruled line 10 is inserted from the inner surface side of the inner paper box 2, which is folded at the valley, and the opposite side where the folded ruled line 10 is formed is swollen and bent. The bottom part of the partition plate 17 and the body part 15 are easy to return to the original shape. FIG. 10 shows a state of the body portion 15 with a ruled line from the outer surface side of the outer paper box 5, which is folded in a mountain, the reverse side on which the folded ruled line 10 is formed is the ruled line portion bulge 14, and the folded body portion 15 is Easy to maintain.

  FIG. 11 shows the formation of the folded ruled line 10 in the embodiment of the present invention. The inner paper box 2 includes the folded ruled line 10 from the inner surface side, and the ruled line bulge 14 is formed outside the paper box. On the other hand, the crease line 10 of the outer paper box 5 is formed from the outer surface side. The partition plate 17 and the flange portion 7 of the inner paper box 2 are mountain-folded when the folding ruled line 10 is placed inside, and the shape is easily maintained, but the bottom of the partition plate 17 and the body portion 15 are conversely valley-folded. It is better to give it. On the other hand, the body portion 15 of the outer paper box 5 is easily held when the crease line 10 is on the outer surface side, and the flange portion 6 is reversely folded, so it is better to have a ruled line inside.

  However, if the crease lines 10 are provided on the front and back, the process is doubled. In the case of the flange portion 7, the flange portion 7 of the outer paper box 5 is pressed back by the flange portion 7 of the inner paper box 2, so that the fold ruled line 10 of the flange portion 7 of the outer paper box 5 needs to be provided on the inner side. Absent. Similarly, the partition plate 17 formed from the inner side of the inner paper box 2 and the crease line 10 of the body portion 15 also generate a repulsive force to open the inner paper box 2 to the outer side and easily return to the original shape, but the outer paper box 5 The folded body 15 is easy to maintain its shape, the molded film covers the entire surface of the tray, and the return of the body 15 of the inner paper box 2 is suppressed, so that the formability is improved and the line is cracked in the box making process. It is possible to prevent the loss of barrier properties due to film tearing.

DESCRIPTION OF SYMBOLS 1 ... Paper container 2 ... Inner paper box 3 ... Inner surface resin film 4 ... Outer surface resin film 5 ... Outer paper box 6 ... Blank (for outer paper box)
7 ... Flange 8 ... Bottom 9 ... Side 10 ... Folded crease line 11 ... Heater 12 ... Mold 13 ... Suction port 14 ... Ruled line bulge 15 ... Body Section 16 ... Stack piece 17 ... Partition plate 18 ... Blank for inner paper box with partition plate

Claims (7)

  The bottom part, the body part, the flange part, and the partition plate are each connected by a folded ruled line, and an inner paper box made of a single blank, and an inner surface resin film and a bottom part laminated on the inner surface of the inner paper box and larger than the inner surface of the inner paper box The body part, the flange part, and the partition plate are each connected by a folded ruled line, and consist of an outer paper box made of one blank and an outer surface resin film larger than the outer surface of the outer paper box laminated on the outer surface of the outer paper box, The folded ruled line in which the outer surface of the inner paper box and the inner surface of the outer paper box are overlapped, and the inner resin film and the outer peripheral resin film are bonded together is a ruled line formed from the inner surface side of the inner paper box. A paper container characterized in that a folded ruled line that forms a boundary between a body part and a flange part of an outer paper box is formed by forming a ruled line from the outer surface side of the outer paper box.   The partition plate of the inner paper box is formed by putting a ruled line from the inner surface side of the inner paper box, folding the mountain as viewed from the inner surface side of the inner paper box, and valley-folding the bottom portion. The paper container according to claim 1.   The paper container according to claim 1 or 2, wherein the inner paper box or the outer paper box has a flange, a ruled line is formed from the inner surface side of the inner paper box, and the ruled line of the flange part is folded in a mountain.   The inner paper box having the flange is made of a single blank, and the flanges at the upper edge of the four surfaces of the paper box are in contact with each other at the end of adjacent flanges and do not overlap each other. The paper container according to any one of claims 1 to 3, wherein:   The step of laminating an inner surface resin film larger than the inner surface of the inner paper box on the inner surface of the inner paper box, the step of overlapping the outer surface of the outer paper box and the inner surface of the outer paper box, and the peripheral edge of the inner surface resin film and the outer surface resin film are bonded together And a process for producing a paper container.   The step of laminating an inner surface resin film larger than the inner surface of the inner paper box on the inner surface of the inner paper box is a step of laminating the inner edge resin film on the inner paper box installed in the molding die by vacuum forming method and / or pressure forming method. The method for producing a paper container according to claim 5, wherein   The step of laminating an outer surface resin film larger than the outer surface of the outer paper box on the outer surface of the outer paper box is a step of laminating the outer surface resin film on the outer paper box installed in the mold by a vacuum molding method and / or a pressure forming method. The method for producing a paper container according to claim 5, wherein

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