JP3779967B2 - Manufacturing method of packaging container - Google Patents

Description

  The present invention relates to a method for manufacturing a packaging container, and more particularly to a method for manufacturing a packaging container filled with frozen food or the like and stored in a packaging bag.

FIG. 4 is a perspective view showing a schematic shape of a conventional packaging container.
Referring to the drawing, the packaging container is composed of a packaging tray 61 and paper containers 13a to 13d. The packaging tray 61 is made of a synthetic resin molding process, and the upper surface of the rectangular sheet shape is divided into four sections. Each section is formed with an inverted frustoconical storage portion 63a to storage portion 63d. In addition, the cut line 17 is formed in the boundary position of these divisions, It is comprised so that these divisions can be isolate | separated using the cut line 17. FIG.

  On the other hand, each of the paper container 13a to the paper container 13d is formed by pressing a circular sheet made of paper, and has a shape in which a plurality of ridges are formed on the side wall and the upper side is opened. The size of each of the storage portions 63 formed on the packaging tray 61 is set so that each of the entire paper containers 13 can be stored therein.

  At the time of use, in a state where the paper container 13a to the paper container 13d are respectively stored in the packaging tray 61, the inside thereof is filled with frozen food or the like. In this state, the packaging tray 61 is accommodated in a packaging bag 65 made of a transparent sheet or the like. The opened portion of the packaging bag 65 is transported in a sealed state or sold at a store.

  Thus, since the conventional packaging container is comprised, since each of the paper container 13a-paper container 13d is sealed in the packaging bag 65 in the state accommodated in the storage part 63a-storage part 63d, these are It is difficult to move in the packaging bag 65, and a relatively stable distribution state is ensured.

In the conventional packaging container as described above, the paper container itself filled with food is made of paper, but the packaging tray for storing it is made of synthetic resin. For this reason, when discarding these, it is necessary to classify them, which is troublesome.
Further, when the paper container is taken out from the packaging bag and placed in a microwave oven or the like, the paper container is set together with the packaging tray. When the heating by the microwave oven is completed, the paper container is taken out from the packaging tray. In other words, this packaging tray is useful for storing and distributing paper containers in packaging bags and for heating with a microwave oven, but it increases costs accordingly.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a packaging container that is simple and easy to handle at the time of disposal and is advantageous in terms of cost.

In order to achieve the above object, the invention according to claim 1 is a method for manufacturing a packaging container, wherein a plurality of paper containers whose upper sides are opened are disposed in each of a plurality of recesses of a lower mold. When, of the upper periphery of each of the paper containers disposed in the lower die in proximity to the outside, a step of placement of a sheet of paper sheet extending horizontally, a plurality of paper containers and paper sheet The step of disposing the film sheet above and the upper mold formed with a plurality of projections fitted in each of the plurality of recesses of the lower mold are lowered from above the film sheet, and the plurality of projections are formed on the film sheet. After the lower end of the sheet is brought into contact, a part of the contacted part is pushed down to deform the film sheet along the upper surface of the paper sheet and the inner surfaces of the plurality of paper containers, and the upper die is completely The film sheet that has been lowered and deformed is placed on the upper surface of the paper sheet. By close contact with the inner surface of each of beauty cartons, in which a step of bonding the plurality of paper containers and paper sheet.

If comprised in this way, a film sheet will be pressed so that the inner surface shape of a some paper container and the upper surface of a paper sheet may be followed, and a some paper container and paper sheet will be integrated via a film.

The invention according to claim 2 is the method for manufacturing a packaging container according to claim 1 , wherein an adhesive is applied to the lower surface of the film sheet in the configuration of the invention according to claim 1.

If comprised in this way, a film sheet will be affixed on a some paper container and paper-made sheets with the adhesive force of an adhesive agent .

According to a third aspect of the invention, in the structure of the invention of claim 1 Symbol placement, on a lower surface of the film sheet and adhesive is applied, the film sheet by vacuum pressure molding is to further deformation.

With this configuration, the film sheet is adhered to these modified as further along exactly the inner surface shape and the upper surface of the paper sheet of a plurality of paper container.

Invention of claim 4, wherein, in the configuration of the invention of claim 1 Symbol placement, the film sheet is a multilayer structure that the lower layer side is made of heat-sealable synthetic resin sheet, a step of deforming the film sheet is heated state It is done in

If comprised in this way, a synthetic resin sheet will heat-seal with respect to several paper containers and paper sheets with a deformation | transformation of a film sheet.

As described above, the invention according to claim 1 is characterized in that the quality of the packaging container is improved because the film sheet is stably deformed even on the inner surface of a complicated shape composed of a plurality of paper containers and paper sheets. In addition, since the plurality of paper containers and the paper sheet are integrated, a packaging container having a plurality of paper containers that are easy to handle is obtained.

In addition to the effect of the invention of claim 1 , the invention of claim 2 bonds the film sheet, the plurality of paper containers and the paper sheet with an adhesive , and improves the stability of the adhesive state of the film sheet. Therefore, the quality of the packaging container is improved .

According to a third aspect of the invention, in addition to the effect of the invention of claim 1 Symbol placement, more reliably and stably film sheet is deformed to a plurality of paper container and the inner surface of complex shape made of paper sheet Therefore, the quality of the packaging container is improved.

Invention of claim 4, in addition to the effects of the invention of claim 1 Symbol placement, since the synthetic resin sheet with the deformation of the film sheet is thermally fused to the plurality of paper containers and paper sheet, the adhesive They are bonded and integrated without the need for agents.

  FIG. 1 is a perspective view showing the external shape of a packaging container according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II shown in FIG.

With reference to these drawings, the packaging container 11 is divided into four sections, and a paper container 13a to a paper container 13d are installed in each section. The paper container 13 is formed by pressing a paper circular sheet (weighing: 35 to 500 g / m ² ), and the upper part in which a plurality of ridges are formed on the side wall is an open container. Each of the paper containers 13a to 13d has the same shape in this embodiment, and is arranged at a predetermined interval so that the horizontal levels of the upper peripheral edge portions 18 are substantially the same.

On the other hand, the cardboard sheet 14 has a rectangular sheet shape with rounded corners, and circular openings 16a to 16d are formed at corresponding positions in each section. The size of the opening 16 is set so as to be close to the outside of the upper peripheral edge 18 of the paper container 13, that is, the cardboard sheet (weighing: 300 g / m ² ) 14 is a paper container 13a to a paper container 13d. Each of the upper peripheral edge portions 18 is configured to extend in the horizontal direction in proximity to the outside.

  A film 15 (thickness: about 100 μm) 15 made of a synthetic resin such as transparent polypropylene integrally covers the upper surface of the cardboard sheet 14 from the inner surface side of each of the paper containers 13a to 13d and is in close contact with them. Have been glued to. Thus, each of the paper containers 13a to 13d and the cardboard sheet 14 are integrated to constitute the packaging container 11 as a whole. A cut line 17 is formed for the film 15 and the cardboard sheet 14 at the boundary position of each section of the packaging container 11. By separating each section using the cut line 17, the packaging container 11 can be used as a container having a cardboard sheet 14 and a part of the film 15 around each paper container 13.

  In this embodiment, a transparent polypropylene film is used as the film 15, but the thickness, material, color, etc. may be changed as appropriate. For example, a polyester film colored in an arbitrary color is used. It can be used.

  When in use, each of the paper containers 13a to 13d in the packaging container 11 is filled with frozen food and the like, and in this state, the packaging container 11 is stored in the packaging bag 65 as shown in FIG. Just do it. In the state of being stored in the packaging bag 65, each of the paper container 13a to the paper container 13d is integrated with the cardboard sheet 14, so that they can be kept in a stable storage state with no fear of moving. Become.

  In use, the entire packaging container 11 may be covered with a microwave oven, for example. However, depending on the application, the paper container 13 to be used may be cut out and used for the microwave oven. good. In this separated state, a portion of the cardboard sheet 14 is integrated around the upper peripheral edge 18 of the paper container 13 with the film 15 interposed therebetween. Becomes easier.

  As described above, the packaging container 11 according to this embodiment is entirely made of paper except for the film 15. Therefore, since it is not necessary to separate paper and synthetic resin as in the prior art, the disposal process is simplified.

  FIG. 3 is a diagram showing a schematic process of the packaging container manufacturing method according to the first embodiment of the present invention.

  Referring to the figure, in (1), the lower mold 19 in which the concave portion 20a and the concave portion 20b are formed, and the convex portion 24a and the convex portion 24b are formed above the lower mold 19 and moved downward. A flexible upper mold 23 is prepared. The recesses 20a and 20b are shaped so that the entire paper container 13 shown in FIG. On the other hand, the convex part 24a and the convex part 24b of the upper mold 23 have a shape corresponding to the concave part 20a and the concave part 20b and are slightly smaller.

  Next, as shown in (2) of FIG. 3, the paper container 13a and the paper container 13b which comprise a packaging container are accommodated in the recessed part 20a of the lower mold | type 19, and the recessed part 20b. A cardboard sheet 14 constituting a packaging container is installed on the upper surface of the lower mold 19 so that the opening 16 is positioned above the recesses 20a and 20b. Furthermore, a film sheet 26 that becomes the film 15 of the packaging container 11 is preheated above the lower mold 19 and conveyed in a state of being easily deformed. Note that an adhesive is applied to the entire lower surface of the film sheet 26. Moreover, it can replace with an adhesive agent and can also use it, bonding the resin film (sealant film) etc. which have adhesiveness.

  From this state, as shown in FIG. 3 (3), the upper mold 23 descends. The convex portions 24a and 24b of the upper mold 23 first come into contact with the upper surface of the film sheet 26 and are partially pushed down so as to follow the inner surfaces of the paper container 13a and the paper container 13b accommodated in the lower mold 19. To deform. The convex part 24a and convex part 24b of the upper mold 23 are formed in a shape corresponding to the paper container 13a and paper container 13b of the lower mold 19. Therefore, when the upper mold 23 is completely lowered, the film sheet 26 is preheated as shown in the figure, so that it is easily deformed into the film 15, and the upper surface of the cardboard sheet 14 is integrated from the inner surface side of the paper container 13a and the paper container 13b. Covering them, they are in close contact with them. Since an adhesive is applied to the lower surface of the film 15, the film 15 is bonded to the inner surfaces of the paper container 13 a and the paper container 13 b and the upper surface of the cardboard sheet 14.

  Next, when the upper mold 23 is raised to the original position, the paper container 13a, the paper container 13b, and the cardboard sheet 14 are integrated through the film 15 by the above-described process, and the packaging container according to the first embodiment. 11 will be manufactured.

  In the above-described embodiment, the film sheet 26 is press-molded to adhere to the paper container 13 and the cardboard sheet 14 to integrate them. It is also possible to configure the film sheet 26 to adhere to the paper container 13 and the cardboard sheet 14 by vacuum / pressure air forming instead of the press forming. In this case, the air in the space between the film sheet 26 and the paper container 13 and the cardboard sheet 14 is discharged outward through the lower mold 19. For this reason, it is necessary to make the paper container 13 and the cardboard sheet 14 have air permeability. Further, in the vacuum / pressure forming, the film sheet 26 is surely adhered to the paper container 13 and the cardboard sheet 14, so that the convex portion 24 a and the convex portion 24 b formed on the upper mold 23 are the same as those in the above embodiment. The lower mold 19 may not be elaborate with respect to the recesses 20a and 20b. Even in this vacuum / pressure forming, an adhesive is similarly applied to the lower surface of the film sheet 26 in order to stabilize the adhesive state.

  In the above embodiment, a plurality of paper containers are targeted, but the same effect can be obtained even if the paper container is a single body.

  In the above embodiment, the paper container to be used is formed with a plurality of ridges on the side wall, but it goes without saying that it can be similarly applied to a paper container in which such ridges are not formed. In this case, the present invention can be applied in the same manner even when an edge winding is formed on the upper peripheral edge of the paper container.

  Furthermore, in the above embodiment, a cut line is formed in the cardboard sheet and the film, but this cut line is not always necessary. In the present invention, the cut line refers to easy cutting line processing such as perforation processing and half cut processing, and the number, length, and position thereof may be appropriately changed as necessary. When it is desired to separate only the paper container from the packaging container 11 as will be described later, separation is facilitated by providing a circular cut line on the film 15 at the boundary between the paper container 13 and the cardboard sheet 14. . Further, in this case, if the cut line connecting adjacent circular cut lines is formed so as to cross the cut line 17, the paper container can be separated more easily.

  Further, in the above-described embodiment, all of the plurality of paper containers have the same shape. However, even if they have different shapes and sizes, they can be applied in the same manner and have the same effects.

  FIG. 5 is a perspective view showing the appearance of a packaging container according to the second embodiment of the present invention.

  Referring to the drawing, the basic shape is the same as that of the packaging container according to the first embodiment, except that notches 31a to 31h are provided on the outer peripheral edge of cardboard sheet 14. That is, these notches are formed at two locations (a total of eight locations in the second embodiment) on the outer peripheral edge of the cardboard sheet 14 close to each of the openings 16a to 16d.

  If comprised in this way, the paper containers 13a-13d filled with frozen food etc. will be isolate | separated from the packaging container 11 separately by tearing the cardboard sheet | seat 14 with the film adhere | attached on it using the notch 31 to right and left. It becomes easy to take out. In this case, if the film 15 at the boundary between the paper container 13 and the cardboard sheet 14 is cut, the separation becomes easier.

  Such a notch can be similarly applied to a packaging container having a single paper container, and has the same effect.

  Further, in place of such a notch, the same effect can be obtained by forming a cut line similar to the cut line 17 at a corresponding location.

  Furthermore, in the second embodiment described above, the number of notches, the formation location, and the like are specified, but it goes without saying that these may be appropriately changed according to the use situation of the packaging container.

  FIG. 6 is a perspective view showing the external shape of a packaging container according to the third embodiment of the present invention.

  Referring to the drawing, the basic shape is the same as that of the packaging container according to the first embodiment, but the shapes of the openings 16a to 16d formed in the cardboard sheet 14 are different. That is, the opening of the packaging container according to this embodiment is not a mere circle, but has a shape including protrusions 33a to 33h that project outward in a substantially semicircular shape at locations facing the circular portion. .

  If comprised in this way, the paper containers 13a- filled with the frozen food etc. will be carried out by pinching each paper container through a finger so that the film 15 currently formed on it may be broken using the protrusion part which opposes. 13d can be easily separated from the packaging container 11 and taken out. In this case as well, as described above, if the film 15 at the boundary between the paper container 13 and the cardboard sheet 14 is cut, the separation is further facilitated.

  Such a notch can be similarly applied to a packaging container having a single paper container, and has the same effect.

  Moreover, in said 3rd Embodiment, although the number of a protrusion part, a formation location, etc. are specified, these are 1 to 1 paper container, for example according to the form and use condition of a packaging container. Needless to say, the number of protrusions may be appropriately changed to about 4 protrusions.

  Further, in each of the above embodiments, a single film sheet is used, but a film having a multilayer structure of two or more layers may be used. In this case, polyethylene having a thickness of about 60 μm is used for the lower layer film on the paper container and the cardboard sheet side, and a polypropylene or polyester film having a thickness of about 20 to 40 μm is used for the upper layer film. It is more effective to use a film sheet integrated by coextrusion. That is, when the film sheet is pressed in a press molding or vacuum / pressure forming, and the film sheet is pressed in a heated state, the lower polyethylene layer is heat-sealed to form a lower paper container or cardboard sheet. This is because the adhesive is not required to be applied unlike the previous embodiments.

It is the perspective view which showed the external appearance shape of the packaging container by 1st Embodiment of this invention. It is sectional drawing of the II-II line shown in FIG. It is a schematic process drawing which shows the manufacturing method of the packaging container shown in FIG. It is the perspective view which showed schematic shape of the conventional packaging container. It is the perspective view which showed the external appearance shape of the packaging container by 2nd Embodiment of this invention. It is the perspective view which showed the external appearance shape of the packaging container by 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Packaging container 13 ... Paper container 14 ... Cardboard sheet 15 ... Film 17 ... Cut line 18 ... Upper peripheral part 26 ... Film sheet In addition, the same code | symbol in each figure shows the same or an equivalent part.

Claims (4)

A method of manufacturing a packaging container,
Disposing a plurality of paper containers open at the top in each of a plurality of recesses in the lower mold; and
In proximity to the outside of the upper periphery of each of the paper container which is arranged in the lower mold, a step of placement of a sheet of paper sheet extending in the horizontal direction,
Disposing a film sheet above the plurality of paper containers and the paper sheet;
The upper mold formed with a plurality of convex portions fitted in each of the plurality of concave portions of the lower mold is lowered from above the film sheet, and the lower ends of the plurality of convex portions are brought into contact with the film sheet. And then partially pressing down the contacted portion to deform the film sheet along the upper surface of the paper sheet and the inner surfaces of the plurality of paper containers;
The upper mold is completely lowered, and the deformed film sheet is brought into close contact with the upper surface of the paper sheet and the inner surface of each of the paper containers, and adhered to the plurality of paper containers and the paper sheet. A method for producing a packaging container, comprising: a step. The manufacturing method of the packaging container of Claim 1 with which the adhesive agent is apply | coated to the lower surface of the said film sheet. The manufacturing method of the packaging container according to claim 1, wherein an adhesive is applied to the lower surface of the film sheet, and the film sheet is further deformed by vacuum pressure forming. The film sheet has a multilayer structure composed of a synthetic resin sheet whose lower layer side can be heat-sealed,
The method of manufacturing a packaging container according to claim 1, wherein the step of deforming the film sheet is performed in a heated state.

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