JPH08253237A - Paper container and production thereof - Google Patents

Abstract

PURPOSE: To provide a container reduced in production cost by simplifying a manufacturing process and causing no environmental disruption in disposal treatment after use. CONSTITUTION: A paper blank panel wherein a bottom surface part 1, a side wall part 2 and a flange part 3 are integrated is produced from raw paper such as cup raw paper and put in a vacuum or pressure forming mold to be moded to produce a semi-manufactured product constituting a paper container and an inner protective film 7 composed of a thermoplastic resin is subjected to vacuum molding or pressure forming within the semimanufactured product in a heated state and closely bonded to the entire inner surface thereof to obtain the paper container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container and a method for producing the same, more specifically, prepared foods, natto,
The present invention relates to a paper container useful as a container for lunch boxes and the like and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, various containers such as paper containers and resin containers have been proposed as containers for prepared foods and natto. For example, as a paper product, a cup base paper is laminated with a resin film such as polyethylene on one or both sides of a cup base paper for the purpose of imparting heat sealability or waterproofing, and then a blank plate for a cup or a bottom plate. There has been proposed a paper cup or the like in which a blank plate for forming a cup is manufactured by punching the blanks and the like, and then using these to make a box. As the resin-made material, a foam cup formed by foam-molding a polystyrene resin or the like, or a resin sheet such as polyethylene or polypropylene, which is vacuum- or pressure-molded Produced cups and the like have been proposed.

[0003]

However, in the above paper cup, a resin film is laminated on the base paper for imparting heat-sealing property or waterproofing. In addition, since the liquid etc. leaks from the cut end surface of the blank plate, it is necessary to perform water resistant processing, and therefore, there is a problem that the manufacturing process is complicated and complicated. Further, in the above resin cup, there is a problem in disposal after use as a container, and these containers after use are currently collected and reused, or burned, or as they are. Although it has been disposed of, etc., it is not in a satisfactory state in any case, and its disposal is
It is said to be the cause of environmental destruction. Therefore, an object of the present invention is to simplify the manufacturing process and reduce the cost,
Another object is to provide a container that does not cause environmental damage when it is disposed of after use.

[0004]

As a result of earnest research to solve the above problems, the present inventor has made a paper product having a bottom part, a side wall part and a flange part integrally formed from a base paper such as a cup base paper. A blank plate is manufactured, and it is placed in a mold for vacuum or pressure forming to manufacture a semi-finished product of a paper container, and an internal protective film made of a thermoplastic resin in a heated state is further provided inside the blank plate. When the film is vacuum or pressure-formed and the film is closely adhered to the entire inner surface, the step of laminating the resin film can be omitted, and the container can be manufactured by an extremely simple step, and The manufactured container is a paper container mainly made of paper, and the present invention has been completed by finding a paper container that can be discarded as combustion waste after use.

That is, according to the present invention, the polygonal bottom portion and the side portions of the bottom portion that are connected to each other and stand upright, and at the corners that constitute the container, one side wall end is opposite to the other side wall portion. A plurality of side wall parts adjacent to each other in contact with the end part, and a corner part which is connected to the upper part of the side wall part and constitutes the flange of the container, the end part of one flange part is the end part of the other flange part. A paper container body composed of a plurality of adjacent flange portions in contact with each other or in a superposed state, and a thermoplastic resin which is closely adhered to the inner surface of the paper container body by suction under vacuum or pressure in a heated state. A paper container characterized by comprising an internal protective film.

According to the present invention, a polygonal bottom portion is erected so as to be connected to each side of the bottom portion, and stands up to form a container. A plurality of side wall parts adjacent to each other in contact with the end part are connected to the upper part of the side wall part, and one end part of one flange part is in contact with the end part of the other flange part at a corner part forming a flange of the container. In a state where they are stacked or polymerized, a paper blank plate consisting of a plurality of adjacent flange portions is placed in a mold for vacuum or pressure forming, and a semi-finished product of a paper container is boxed in the mold, and then A paper container characterized in that a semi-finished product of the paper container is internally vacuum-pressed or pressure-molded with an internal protective film made of a thermoplastic resin in a heated state to closely adhere the internal protective film to the entire inner surface thereof. Is a manufacturing method of.

[0007]

According to the present invention described above, a blank plate for producing a container, which is a combination of a bottom surface portion, a side wall portion and a flange portion constituting a container, is manufactured, and the blank plate is put into a molding die for vacuum or pressure molding. A semi-finished product that forms a paper container is manufactured by box-making in a mold, and a bottom surface part, a side wall part, and a flange part that form the semi-finished product are closely adhered with a film made of a thermoplastic resin, which are heated. The paper container is manufactured by fixing the paper container.

[0008]

DETAILED DESCRIPTION OF THE INVENTION First, a method for manufacturing a paper container according to the present invention will be described. FIG. 1 is a schematic plan view showing an example of a paper blank plate in a method for manufacturing a paper container according to the present invention, and FIG. 2 is shown in a molding die for vacuum or pressure forming the above paper blank plate. It is sectional drawing which shows the outline of the shaping | molding die in the state which puts and manufactures the semi-finished product which comprises a paper-made container in this type | mold, and FIG. 3 shows the outline of the semi-finished product of the paper-made container produced above. FIG. 4 is a perspective view, and FIG. 4 is a cross-sectional view showing an outline of a molding die in a state where an internal protective film made of a thermoplastic resin is closely adhered to the inside of the above semi-finished product.

In the present invention, as an example thereof is shown in FIG. 1, a polygonal bottom surface portion 1, a plurality of side wall portions 2 which are connected to each side a of the bottom surface portion 1 and stand upright, and the respective side walls. A paper blank plate X including a plurality of flange portions 3 connected to the upper portion of the portion 2 is manufactured. In the above description, the shape of the bottom surface portion 1 may be any polygonal shape, for example, a triangle,
Any shape such as a pentagon, a hexagon, and an octagon may be used.

Next, in the present invention, as shown in FIG. 2, the paper blank plate X manufactured as described above is placed in a forming die 4 for vacuum or pressure forming, and is boxed in the forming die 4. ,
A semi-finished product Y that constitutes a paper container is manufactured. In the figure, 5 is a molding machine bed, 6 is a vacuum hole for suction, 7 is an internal protective film made of a thermoplastic resin, and 8 is a clamp for clipping it.

The semi-finished product Y manufactured above is shown in FIG.
As shown in FIG.
Stands up from each side a, and at the corners that make up the container,
The end portion 21 of each side wall portion 2 and the end portion 21 of the other side wall portion 2 are adjacent to each other while being in contact with each other. Further, each flange portion 3 is
At the corners forming the flange portion of the container, the end portion 31 of the one flange portion 3 and the end portion 31 of the other flange portion 3 are adjacent in a superposed state. In the above, the flange portions 3 are adjacent to each other in a superposed state.
This is because in the blank plate X illustrated above, the end portion 31 of the flange portion 3 also protrudes from the side wall portion 2 in the lateral width. Thus, although not shown in the present invention, when forming the flange portion, in the pair of opposed side wall portions, the flange portion is extended with the same width as the side wall portion, and the other opposed side wall portion is formed. In, in the case where the flange portion is provided so as to protrude from the side wall portion in the lateral width, in this case, each flange portion is provided at the corner portion forming the flange portion of the container with the end portion of one flange portion and the other end portion. The flange portion and the end portion of the flange portion are in contact with each other and are adjacent to each other.

Next, in the present invention, as shown in FIG. 4, while the air is sucked from the vacuum hole 6 of the molding machine bed 5, the inside made of a thermoplastic resin in a heated state, which is clipped by the clamp 8. The protective film 7 is brought into contact with the mold 6 by lowering the clamp 8, and while continuing suction, the internal protective film 7 made of a thermoplastic resin in a heated state is closely adhered inside the semi-finished product Y. After the close adhesion is completed as described above, the suction is released, and the film 7 is further cut to manufacture the paper container Z according to the present invention.

FIG. 5 is a perspective view showing an outline of the paper container manufactured as described above. As shown in FIG. 5, a paper container Z according to the present invention has a polygonal bottom surface portion 1 and a side portion a of the bottom surface portion 1 which is connected to each other and stands up, and one of the corners forming the container is A plurality of side wall portions 2 adjacent to each other in a state where the end portion of the side wall portion 2 is in contact with the end portion of the other side wall portion 2, and the side wall portion 2
A plurality of flange portions 3 which are adjacent to each other in a state where one end portion of one flange portion 3 is in contact with the other end portion of the other flange portion 3 or overlaps with each other at a corner portion which is connected to the upper portion of the container and constitutes a flange of the container. And the inner protective film 7 made of a thermoplastic resin is closely adhered to the inner surface of the paper container body. That is, the paper container Z according to the present invention includes a bottom surface portion 1 and a side wall portion 2.
And a flange portion 3 are integrally formed into a paper blank plate, and the bottom portion 1, each side wall portion 2 and each flange portion 3 are fixed by an internal protective film 7 made of a thermoplastic resin to form a container. To do.

In the present invention described above, the paper material constituting the paper blank plate is, for example, a basis weight of 150 to 6.
Various types of paperboard, processed paper, cup base paper and the like having a weight of about 00 g / m ² can be used.

In the above-mentioned present invention, the internal protective film made of a thermoplastic resin may be a film made of a thermoplastic resin, for example, various polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate. , Ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid copolymer, polyamide, polyvinylidene chloride, polystyrene, saponified ethylene-vinyl acetate copolymer, polycarbonate, polybutene, polyvinyl alcohol , And various other thermoplastic resin films can be used alone or as a laminate. In the present invention, when the inner protective film made of a thermoplastic resin is closely adhered to the inner surface of the semi-finished product constituting the paper container, the film itself may be adhered in a heated state, or on the surface of the blank plate in advance. An adhesive or the like may be provided, and this may be heated and melted, and the film and the film may be closely adhered.

[0016]

EXAMPLES The present invention will be described in more detail with reference to specific examples. Example 1. Using a paperboard with a basis weight of 270 g / m ² ,
The paper blank plate shown in FIG. This was put in a forming die of a vacuum forming machine as shown in FIG. 2, and the blank plate was box-formed in the die to obtain a semi-finished product constituting a paper container. Next, as shown in FIG. 2, a clamp of a vacuum forming machine was clipped with a low-density polyethylene having a thickness of 60 μm and heated to 90 to 100 ° C. Then, the clamp that clips the polyethylene film is brought close to the mold of the vacuum forming machine and brought into contact with the upper part of the semi-finished product,
A polyethylene film in a heated state was put into the inside of the semi-finished product while sucking through a vacuum hole in the molding die, and the film was closely adhered to the entire inner surface thereof. After the film was tightly adhered, the suction was released, and the film was further cut to obtain the paper container of the present invention. The paper container obtained above was filled with natto and the lid was sealed to produce a package. This one was no better than the conventional one. Also,
After use, it could be disposed of as combustion waste.

[0017]

As is apparent from the above description, according to the present invention, a blank plate for manufacturing a container is manufactured which has a bottom portion, a side wall portion and a flange portion constituting the container, which are integrated with each other. A semi-finished product that forms a paper container is manufactured by placing it in a molding die for molding, and a bottom surface portion, a side wall portion, and a flange portion that constitute the semi-finished product are in a heated thermoplastic resin. A paper container is manufactured by tightly adhering films made of the above and fixing them. Therefore, the present invention, when producing a cup made of paper as in the conventional case, is laminated with a resin film on the cup base paper, or water-resistant processing is performed because liquid or the like leaks from the cut end face of the blank plate. The problem that it has to be applied is improved, and the manufacturing process is remarkably simplified.
That is, a blank plate is produced as it is from a cup base paper, and this is box-molded in a mold for vacuum or pressure-molding the film, and then vacuum or pressure suction is applied to the entire inner surface to closely bond the resin film. Therefore, the film laminating process, the blank plate end face treatment, etc. are not necessary at all. Further, since the paper container of the present invention is a container mainly made of paper, it can be discarded as combustion dust as it is after being used as a container, which does not cause environmental damage. INDUSTRIAL APPLICABILITY The paper container according to the present invention is extremely useful as a container for packaging prepared foods or natto.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of a paper blank plate.

FIG. 2 is a cross-sectional view showing an outline of a molding die in a state where a semi-finished product which constitutes a paper container is made from a paper blank plate.

FIG. 3 is a perspective view showing an outline of a semi-finished product which constitutes a paper container.

FIG. 4 is a cross-sectional view schematically showing a molding die in a state where an internal protective film made of a thermoplastic resin is closely adhered to the inside of a semi-finished product forming a paper container.

FIG. 5 is a perspective view showing an outline of a paper container according to the present invention.

[Explanation of symbols]

 1 Bottom part 2 Side wall part 3 Flange part 7 Internal protective film made of thermoplastic resin

Claims (2)

[Claims] 1. A polygonal bottom portion and an upright portion which is connected to each side of the bottom portion and stands up, and at a corner portion forming a container, one end portion of one side wall portion is in contact with the end portion of the other side wall portion. A plurality of side walls adjacent to each other in a state of being connected to the upper portion of the side walls, and at the corners that form the flange of the container, the end of one flange is in contact with the end of the other flange, or A paper container main body composed of a plurality of adjacent flange portions in a polymerized state, and an internal protective film made of a thermoplastic resin that is closely adhered to the inner surface of the paper container main body by suction in vacuum or compressed air in a heated state A paper container characterized by comprising: 2. A polygonal bottom portion and standing up by connecting to each side of the bottom portion and forming a container, an end portion of one side wall portion is in contact with an end portion of the other side wall portion. A plurality of side walls adjacent to each other in a state of being connected to the upper portion of the side walls, and at the corners that form the flange of the container, the end of one flange is in contact with the end of the other flange, or A blank paper plate consisting of a plurality of adjacent flange parts in a superposed state is placed in a forming mold for vacuum or pressure forming to form a semi-finished product of a paper container in the forming mold, and then the paper product is made. A method of manufacturing a paper container, characterized in that an inner protective film made of a thermoplastic resin in a heated state is vacuum or pressure-formed inside the semi-finished product of the container to closely adhere the inner protective film to the entire inner surface thereof. .