JPH0434933B2 - - Google Patents

Description

Detailed Description of the Invention <Technical Field> The present invention relates to a method and apparatus for molding a composite container, and more specifically to a composite container in which paper is laminated on the surface of a container body made of a foamed sheet of thermoplastic resin. The present invention relates to a method and apparatus for molding.

<Prior art> Conventionally, containers made of foam sheets for storing foods, etc. have had barcodes, etc. printed on their outer periphery to display information such as patterns, trademarks, product names, product types, prices, etc. things are being done.

However, when printing directly on the foam sheet surface,
There is a disadvantage that printing ink does not adhere well and clear printing cannot be achieved. In particular, when barcodes are poorly printed, they become difficult to read optically and cannot perform their functions.

For this reason, attempts have been made to laminate paper around the outer periphery of a container body made of foamed sheet and to print on the surface of the paper. The above-mentioned paper lamination is also suitable for reinforcing the container body.

The technique for manufacturing a composite container using paper and a foamed sheet is to form a container body into a sheet, and then wrap a strip of paper around the outer periphery of the container body and join the container body.

<Problems to be Solved by the Invention> According to the above-mentioned manufacturing technology, since the paper is attached after the fact, a step is created on the outer periphery of the container due to the paper, which lacks a sense of unity and is unfavorable in appearance. There are problems in that it is difficult to bring the container body and the paper into close contact, it is not possible to ensure sufficient integrity, and the reinforcing effect is not very effective. Moreover, there is also the problem that the manufacturing process becomes complicated and the manufacturing cost becomes high.

In particular, in the case of containers made of foam sheets that are flat and have a wider bottom area than the side walls, simply wrapping the above strip-shaped paper around the side walls has little reinforcing effect; It is desired to bond to the paper in a wide range including from the bottom to the bottom.

<Purpose> This invention has been made in view of the above points, and provides a container with no steps on its surface, good appearance, excellent integrity between the container body and paper, and excellent reinforcing effect. It is an object of the present invention to provide a method and apparatus for forming a composite container that can easily and inexpensively manufacture the composite container.

<Means for Solving the Problems> In a method for molding a composite container as a first invention to achieve the above object, in one movement stop position of a female mold for molding which is moved intermittently, At the same time, the expanded paper is loaded into the female mold by the pressing action of The method is characterized in that the softened foam sheet is pressed into a predetermined shape by a male mold, and at the same time, the paper in the female mold and the foam sheet are joined and integrated.

Further, a molding device for a composite container according to the second invention includes a female mold having a molding part of a predetermined shape, a female mold conveying means for intermittently moving the female mold along a circular orbit, and a female mold that moves the female mold intermittently along a circular orbit. At the moving stop position of the female die, a paper feeding means supplies the paper to a position opposite to the female die, a pusher pushes the supplied paper into the female die, and at another moving stop position of the female die, the paper is loaded. a foam sheet supplying means for supplying a foam sheet to a position facing the female mold, a heating means for heating and softening the foam sheet during its supply, and a foam sheet facing the female mold,
It is characterized by comprising a male die which is pressed into the female die to mold it into a predetermined shape and at the same time joins and integrates the paper in the female die and the foam sheet.

<Examples> Examples will be described in detail below with reference to the accompanying drawings showing examples.

FIG. 1 is a schematic side view of an apparatus used to carry out the method of molding a composite container of the present invention, illustrating an apparatus for molding a rectangular, deep-dish composite container.

The above-mentioned molding apparatus includes a female mold 1 having a molding part 1a having a predetermined shape, a female mold conveying means 2 for intermittently moving the female mold 1 along a circular orbit, and a paper P facing a predetermined female mold 1. A paper feeding means 3 and the paper P are placed in a female mold 1.
A pusher 4 for pushing the paper P into the mold, a foam sheet supply means 5 for supplying the foam sheet S to a position facing the female die 1 loaded with the paper P, and a heating means 6 for heating and softening the foam sheet S during supply. It is composed of a female mold 7 and the like that push the foam sheet S facing the female mold 1 into the female mold 1.

More specifically, the paper P supplied by the paper feeding means 3 is a strip-shaped paper having a plurality of rows of half-punched parts P1 that are partially pre-cut with non-cutting parts P2 (see Fig. 2). ), the outline shape of the half-punched part P1 is the developed shape of the composite container A (see Fig. 5), and the lower surface of the paper P (the surface to be joined to the foam sheet) is coated with a hot melt type adhesive. has been done.

Further, the paper feeding means 3 is constituted by a chain conveyor 3a capable of supporting both sides of the paper P, and is intermittently driven by a drive section 3b at predetermined strokes. Then, the paper P is sequentially fed out from the roll P3 by the paper feeding means 3, and is run and fed between the female die 1 located at one movement stop position x1 and the pusher 4 opposed thereto.
Reference numeral 3c denotes a guide member, which is formed to have a U-shaped cross section in order to guide the chain conveyor 3a and the paper P.

The female mold conveying means 2 is constituted by a chain conveyor 2a that rotates endlessly, and the female mold 1 can be moved intermittently by a predetermined stroke by a driving section 2b. The female mold 1 is connected to the chain conveyor 2 mentioned above.
The female die 1 is formed with a number of molding parts 1a corresponding to the half-punched parts P1 of the paper P.

The pusher 4 is configured to be able to advance from below the chain conveyor 3a to the innermost part of the molding part 1a of the female mold 1 by a drive mechanism (not shown) such as a cylinder, and the pusher 4 is configured to be able to advance to the innermost part of the molding part 1a of the female mold 1, and is capable of advancing into the innermost part of the molding part 1a of the paper P. can be separated from the surrounding excess portion and pushed into the molded part 1a. Note that the pushers 4 are provided in the same number as the molding parts 1a of the female mold 1.

The foam sheet supply means 5 includes a pinch roller 5 that feeds out the foam sheet S from the roll S1 and runs intermittently.
a, and feeds the paper P to the movement stop position x2 of the female die 1, which is different from the movement stop position x1. In the case of the figure, the movement stop position x2 is set at a position symmetrical to the movement stop position x1, but it is of course possible to set it to another movement stop position. Note that the foam sheet supplying means 5 can also be configured by a chain conveyor similar to the paper feeding means 3.

The heating means 6 is provided in the middle of supplying the foamed sheet S, and can heat the foamed sheet S supplied by the foamed sheet supplying means 5 to the molding temperature to soften it. The heating means 6 can be configured, for example, by a heating furnace incorporating a heater.

The male mold 7 is provided above the foam sheet S in a state where it faces the female mold 1 at a movement stop position x2 of the female mold 1, and is driven by a drive mechanism (not shown) such as a cylinder to a predetermined stroke. It is now possible to descend. The male mold 7 has the same number of molding parts 7a as the molding parts 1a of the female mold 1.

Note that between one movement stop position x1 of the female mold 1 and another movement stop position x2, the female mold 1
A heater 8 is disposed for preheating the adhesive applied to the paper pieces P6 (see FIG. 3) loaded in the paper sheet P6 (see FIG. 3). Furthermore, the molding part 1a of the female mold 1 has a suction port 1b (see FIG. 3) between one movement stop position x1 and another movement stop position ) through
It is being vacuumed. This vacuum suction can be applied, for example, to the movement stop position x1 and the movement stop position x2.
This can be done by airtightly connecting the suction port 1b to the rotary valve 9 disposed between the two.

In order to carry out the method for molding a composite container of the present invention using the molding apparatus configured as described above, first, the paper P is moved to the movement stop position x of the female mold 1 by the paper feeding means 3.
1, the pusher 4 is advanced toward the female mold 1, and the half-punched portions P1 of the paper P are pushed into the respective molding portions 1a of the female mold 1. As a result of the above, the half-punched part P1 has the uncut part P2 cut off, and is loaded into the molding part 1a of the female mold 1 as a piece of paper P6 (see FIG. 3). At this time, the peripheral portion of the paper piece P6 can be bent along the peripheral wall of the female molded part 1a. After retracting the pusher 4 to its original position, the female conveying means 2 is driven.
Move female mold 1 one pitch. Thereafter, by repeating the above operation, the female mold 1 loaded with the paper piece P6 is
can be sequentially transferred to the movement stop position x2. During the transfer, the heater 8 can preheat the adhesive applied to the paper piece P6. Moreover, by vacuum suction from the suction port 1b of the female mold 1, the piece of paper P6 is pulled into the female mold 1.
It is possible to reliably prevent the paper piece P6 from falling off from the female mold 1 by bringing it into close contact with the molding part 1a.

Meanwhile, in parallel with the loading operation of the paper strip P6 into the female mold 1 described above, the foam sheet S heated and softened by the heating means 6 is sequentially fed to the movement stop position x2 of the female mold 1 by the foam sheet supply means 5. do. Then, the male mold 7 is lowered and the female mold opposing portion of the foam sheet S is pushed into the molding part 1a of the female mold 1,
It is molded into a deep dish shape along the molding part 1a and the paper piece P6 (see FIG. 4). At this time, since adhesive has been applied to the paper piece P6 in advance, the foam sheet S
Simultaneously with the molding, the paper piece P6 of the female mold 1 and the foamed sheet S can be joined and firmly integrated.

Next, after separating the male mold 7 from the female mold 1, the chain conveyor 2a is driven in synchronization with the completion time of the loading operation of the paper piece P6 at the movement stop position x1, and the paper piece P6 obtained as described above is driven.
The integrally molded product B consisting of the foamed sheet S and the foamed sheet S is moved one pitch at a time while being loaded into the female mold 1. and,
At the front end of the chain conveyor 2a, the female mold 1
The molded product B is released from the female mold 1 by utilizing the rotary movement along a circular orbit, and the molded product B is removed by a cutter 10 provided at a predetermined portion on the feeding front side. By cutting it at predetermined intervals, collecting it, and then trimming it, it is possible to obtain a composite container A in which the paper pieces P6 are laminated on the side wall and bottom of the container body A1 formed of the foam sheet S. (See Figure 5). By repeating the above operations, the composite container A can be manufactured continuously and efficiently. Note that the above trimming can of course be performed on the chain conveyor 2a.

In the composite container A obtained as described above, the paper pieces P6 are laminated at the same time as the foam sheet S is formed.
The outer surface of the paper piece P6 is flush with the surface of the container main body A1, and there is no step caused by the paper piece P6, giving a good sense of unity and providing a good appearance. In addition, the container body A1 can exhibit good heat insulation, moldability, etc. similar to conventional foam sheet containers, and the paper strip P6 can provide good printability, which is the same as that of conventional paper containers. , breakage resistance, heat resistance, etc., and can exhibit excellent usage effects not found in conventional foam sheet containers and paper containers.

In addition, since the container body A1 and the paper strip P6 are integrally molded and are completely adhered to each other, the joint strength is much higher than when paper is laminated after the fact, and the durability during use is also excellent. Become something. Furthermore, the composite container A can be manufactured easily.

FIG. 6 is a schematic side view showing another embodiment, in which the molding is performed using a veneer-shaped paper P cut in advance to a predetermined size. On the above paper P,
A plurality of pre-cut semi-punched parts P1 are formed in a plurality of rows with partially provided non-cutting parts P2, and the paper feeding means 3 for this paper P is a suction cup that vacuum-chucks the papers P one by one. 3d, a drive mechanism such as a cylinder 3e that moves the paper P attracted to the suction cup 3d to a stop position x1 of the female die 1, and a clamp 3f that holds the moved paper P at a position opposite the female die 1. It is made up of. Further, the female mold conveying means 2 is constituted by a polygonal index table 2c that rotates by a predetermined angle.
A female mold 1 is attached to each side of the . In addition, in the paper feeding means 3, at least the suction cup 3
The number d corresponding to the number of papers P is provided. In this respect, the pusher 4 and the molding part 7 of the male mold 7
The same applies to a.

Also, in the above-described forming apparatus, it is possible to efficiently form a composite container A in which paper pieces P6 are laminated on the side wall and bottom of a container body A1 formed of a foamed sheet S, in the same manner as in the above embodiment. can. That is, the female die 1 is moved intermittently by the index table 2c, the paper P is fed one by one to the movement stop position x1 of the female die 1 by the paper feeding means 3, and the paper P is moved by the pushing action of the pusher 4. is punched out, a piece of paper P6 is loaded into the female die 1, and at another movement stop position x2 of the female die 1, a heated and softened foam sheet S is inserted into the female die 1 loaded with the above-mentioned piece of paper P6. At the same time, the paper piece P6 in the female mold 1 and the foam sheet S are joined and integrated by pressing into the mold 7 to form a predetermined shape,
After releasing the molded product B, the composite container A can be obtained by trimming the molded product B.

The foam sheet S as the material of the container body A1 is
In addition to foamed polystyrene sheets, foamed sheets of various thermoplastic resins such as copolymers of polystyrene and other resins, high-impact polystyrene, polypropylene, polyethylene, vinyl chloride, MMA, etc., can be used in the same way as conventional packaging containers.

In addition, the outer shape of the container body A1 can be various shapes such as a hexagonal shape in addition to the rectangular deep dish shape shown in the figure. The present invention is particularly suitable as a molding device for a composite container A having a relatively flat shape with a large bottom area.

Furthermore, as the paper P, various papers such as kraft paper, which are used for ordinary packaging materials, can be used. This is preferable since it can enhance the integration with A1. As the above-mentioned adhesive, it is preferable to use a thermally adhesive adhesive that exhibits an adhesive effect using the heat during molding.
Pressure-sensitive adhesives and other adhesives that exhibit adhesive action can also be used. Also, paper P
A bending groove such as a concave groove or a perforated groove may be formed in the bent portion, and in this case, the bending can be performed more accurately and easily. Further, as the paper P supplied by the paper feeding means 3, a piece of paper P6 punched in advance into a developed shape may be used.

On the other hand, in the forming apparatus, the heater 8 that preheats the adhesive applied to the paper P is provided depending on the type of adhesive applied to the female mold 1, and uses a thermal adhesive. Even in this case, the heater 8 is not necessary if the adhesiveness can be exhibited only by the heat of the heated and softened foam sheet S.

In addition, in the forming apparatus shown in FIG.
In addition, as the paper feeding means 3, a pusher type device that pushes out and feeds the paper P one sheet at a time may be adopted.

Furthermore, the sheet feeding means 3 may be configured with a roller conveyor, the male die 7 may be provided with an air injection port so as to use air pressure forming together when forming the foam sheet S, the male die 7 may be configured with a flat plate, etc. Various changes can be made without changing the gist of the invention.

<Effects of the Invention> As described above, according to the method for forming a composite container of the present invention, since paper is laminated at the same time as forming the container body, the two are completely adhered, resulting in strong joint strength and ease of use. It is possible to mold containers with excellent durability over time. Moreover, the container has no steps due to the paper on the outer periphery, exhibits a good sense of unity, and is suitable for appearance, and also has good printability, tear resistance, heat resistance, etc. due to the paper on the surface. can be obtained.

Furthermore, manufacturing is easier than when paper is laminated after the fact, and the manufacturing cost of the composite container can be reduced.

On the other hand, the molding device used to carry out the above molding method is one that moves the female mold intermittently along the orbit, and simultaneously feeds paper and molds the foam sheet at the position where the female mold stops moving. Therefore, less idle time is required, and composite containers can be efficiently molded. Therefore, a unique effect is achieved in that it can further contribute to reducing the manufacturing cost of the composite container.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing a forming device for a composite container, Fig. 2 is a partially cutaway plan view, Fig. 3 is a sectional view of the main part showing a state in which paper is loaded, and Fig. 4 shows the forming process. 5 is a perspective view of the composite container, FIG. 6 is a schematic side view showing another embodiment of the molding device, and FIG. 7 is a partially cutaway plan view. DESCRIPTION OF SYMBOLS 1... Female mold, 1a... Molding part, 2... Female mold conveyance means, 2a... Chain conveyor, 2c... Index table, 3... Paper feeding means, 4... Pusher, 5... Foam sheet Supply means, 6...Heating means, 7...Male die, P...Paper, P1...Half punched part, P2...Uncut part, S...Foam sheet, A
...Composite container, A1...Container body, x1, x2...
...Female type stop position.

Claims (1)

[Claims] 1. A method for molding a composite container in which paper is laminated on the surface of a container body made of a foamed sheet of thermoplastic resin, the method comprising: a female mold for molding that is moved intermittently; At the movement stop position, the unfolded paper is loaded into the female mold by the pressing action of the pusher, and at the same time, the peripheral side of the paper is bent, and at the other movement stop position of the female mold, the paper is loaded. Molding of a composite container characterized by pressing a heat-softened foam sheet into a female mold using a male mold to form a predetermined shape, and at the same time joining and integrating the paper in the female mold and the foam sheet. Method. 2. The method of forming a composite container according to claim 1, wherein the paper is coated with an adhesive on the surface to be bonded to the foam sheet. 3 An apparatus for molding a composite container in which paper is laminated on the surface of a container body made of a foamed sheet of thermoplastic resin, which comprises a female mold having a molding part of a predetermined shape, and a female mold along an orbit. A female mold conveying means for intermittently moving the female mold, a paper feeding means for supplying paper to a position facing the female mold at one movement stop position of the female mold, and a pusher for pushing the supplied paper into the female mold. , at another position where the female mold stops moving, at a position opposite the female mold loaded with the paper,
A foam sheet supplying means for supplying a foam sheet, a heating means for heating and softening the foam sheet during its supply, and a foam sheet facing the female mold is pushed into the female mold and simultaneously formed into a predetermined shape. 1. A molding device for a composite container, comprising: a male die that joins and integrates the paper and foam sheet in the female die; 4. The composite container forming apparatus according to claim 3, wherein the female die conveying means is an endlessly rotating conveyor. 5. The composite container forming apparatus according to claim 3, wherein the female die conveying means is an index table. 6. The composite container forming apparatus according to claim 3, wherein the paper feeding means feeds a single piece of paper formed into an expanded shape. 7. The composite container forming apparatus according to claim 3, wherein the paper feeding means supplies paper having a half-punched portion that is pre-cut into a developed shape with a non-cut portion.