JPH0517100B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a synthetic resin container having a display portion such as a pattern and a method for manufacturing the same, and more specifically, to a synthetic resin container having a pattern or other display portion on the upper surface side of the synthetic resin container. The present invention relates to a container to which a synthetic resin film or sheet having a display portion is bonded, and a method for manufacturing the same.

<Prior art and problems to be solved by the invention> Conventionally, three-dimensional molded containers using thermoplastic synthetic resin sheets such as foamed or non-foamed polystyrene sheets have been used for various products by taking advantage of the ease of molding. It is particularly popular as a suitable container for storing foodstuffs. In particular, in order to enhance the appearance of this type of container, displays such as patterns and trademarks have been printed, etc., but relatively thick synthetic resin sheets, especially foamed resin sheets, have been used as the container resin sheets. In some cases, direct display is likely to be insufficient. For this purpose, the current practice is to laminate a synthetic resin film or sheet with a pattern or other markings on the synthetic resin sheet that will become the container side, and then three-dimensionally mold this laminated sheet into the shape of the container. .

However, in the case of a display such as an allover pattern or a dotted pattern that does not require so-called fixed positioning, in which the above-mentioned display such as a pattern is placed in a predetermined position planned by the shape of the container, the current technology described above cannot be applied. However, in order to create a display on the container that requires fixed positioning, such as a design with clear pattern boundaries,
There is a problem with molding from the above-mentioned monolithic sheet.
Because of the difference in the material and thickness of the synthetic resin sheet on the container side and the synthetic resin film or sheet on the laminated side, and the difference in moldability due to the difference in elongation during molding, it is necessary to mold the pattern in place. It is very difficult to do this, and if the position shifts during molding, the container may lose its commercial value. For example, if a container has a periphery on the outside of its opening and you want to display a pattern across the entire periphery, the display position may be shifted and the pattern may be unevenly shifted toward the inner surface of the container. When it is desired to make a display such as a pattern appear at a fixed position on the inner surface of a container, there can be enumerated cases where the appearance position is extremely different for each container that is molded in large numbers.

Therefore, in this invention, as described above,
It is an object of the present invention to provide a container having a structure that can eliminate instability in the positioning of displays such as patterns due to molding, and a method for easily and reliably manufacturing the container.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a container made of a synthetic resin sheet in which small holes for vacuum suction are formed in advance, and a container made of a synthetic resin sheet that is joined to the upper surface side and displays a pattern or the like. The film or sheet is bonded to the peripheral edge of the container by heat fusion, and is bonded to the inner surface of the container by vacuum forming, It is characterized in that the display portion is placed in a fixed position on the container by vacuum forming through the small hole of the container.

Next, regarding a manufacturing method for easily and reliably providing a container having the above structure, a small hole for vacuum suction is formed in a container made of a synthetic resin sheet, and a synthetic resin sheet having a display part such as a pattern on the upper surface side of the container is described. A resin film or sheet is placed on the container, and the film or sheet is first bonded to the periphery of the container by heat-sealing so that the display area such as a pattern on the film or sheet is in a fixed position on the container. The film or sheet is bonded along the inner surface of the container by vacuum forming using vacuum suction from the lower surface of the container through small holes for vacuum suction.

<Function> According to the synthetic resin container having the above-described structure, the synthetic foam resin sheet container has small holes for vacuum suction, so a synthetic resin film or sheet having a display part such as a pattern can be inserted into the container. The structure allows vacuum forming without impairing the positioning of the display, resulting in a container that can be molded in position very accurately. Moreover, the small holes of the container are closed on the upper surface side with a synthetic resin film or sheet bonded from the upper surface side, so there is no problem in using the container as a container.

In addition, the film or sheet is bonded to the periphery of the container by heat fusion, and is bonded to the inner surface of the container by vacuum forming, so the film or sheet is firmly bonded. There is no risk of the container being peeled off during use, and the film or sheet can be easily molded in position.

Next, according to the manufacturing method having the above configuration, after molding the container made of synthetic resin sheet, molding is performed on a synthetic resin film or sheet having a display part such as a pattern. This eliminates problems during molding caused by differences in the display area, and eliminates the risk of misalignment of the display area.

In other words, for the display part, it is sufficient to perform vacuum forming according to the shape of the container made of synthetic resin sheet, taking into consideration the stretchability and formability of the synthetic resin film or sheet alone, and it is easy to predict the position of the display part. This allows molding with improved positioning of the display part.

In addition, the synthetic resin film or sheet can be bonded to the peripheral edge of the synthetic resin container in advance before vacuum forming, and after bonding, vacuum forming can be performed to match the inner shape of the container. , a display portion such as a pattern on the film or sheet can be bonded to a fixed position on the container.

<Example> Next, examples of the present invention will be illustrated below with reference to the drawings.

1 and 2 show a partially cutaway perspective view and a sectional view of an example of a container according to the present invention, in which 10 is a container made of a foamed resin sheet such as foamed polystyrene, and 20 is the container 10. It shows a non-foamed resin film or sheet such as a high-impact polystyrene film or sheet joined along the shape, and various display parts such as patterns 2
1.

The container 10 is composed of a bottom surface 11 and a side surface 12 constituting an inner surface side, and a peripheral edge 13, and the peripheral edge 13 has a substantially horizontal constant width. Furthermore, the bottom surface 11 has a small hole 1 for vacuum suction near the boundary with the side surface 12.
4 are formed in large numbers, and small holes 14 may be formed in other parts of the bottom surface 11. This non-foamed resin film or sheet 20 is formed by vacuum forming through the small holes 14 of the container 10 and joined along the inner shape of the container. Further, the display portion 21 is joined to the container 10 in a fixed position. In the figure, the display portion 21 is joined to the peripheral edge 13 so as to remain therein.

The small hole 14 formed at the boundary between the bottom surface 11 and the side surface 12 of the container 10 serves as a passage for air when the container 10 made of a foamed resin sheet is formed by vacuum suction. Therefore, from the viewpoint of vacuum suction efficiency, it is preferable that the small holes 14 be large, but in terms of appearance, the smaller the holes 14, the less noticeable they are. Therefore, in practice, it is preferable to form as many small holes 14 as possible.

The reason why the small hole 14 is formed at the boundary between the bottom surface 11 and the side surface 12 is because air tends to remain at the boundary during vacuum suction, making it difficult to follow the container.

FIG. 3 also shows a modified embodiment of the invention. This embodiment is characterized in that a partition 30 made of the same sheet as the container 10 made of the foamed resin sheet or a different sheet is added. The partition 30 is joined to the container 10 made of a foamed resin sheet using an adhesive, heat fusion, or the like.

And a non-foamed resin film or sheet 20
As shown in FIG. 4, a container 10 made of a foamed resin sheet and a partition 30 are laminated from above.

Therefore, even if the partition 30 is bonded to the container 10 using an adhesive or the like, when food, etc. is stored in this synthetic resin sheet, the non-foamed resin film or sheet 20 is laminated and covered. There is no risk of adhesive etc. adhering to the stored items.

Therefore, in this embodiment, the container 30 can be added with a good sense of unity, and the difficulty in molding due to the shape can be solved, and it is suitable as a container for foods, etc. from the viewpoint of hygiene and the like. Note that the present invention is not limited to the above-mentioned embodiments, and may include containers with patterns on the bottom surface 11 and side surfaces 12 of the inner surface of the container, and containers with patterns on the periphery 1.
Various design changes such as one without 3 are possible.

As the foamed sheet forming the container 10 made of foamed resin sheet, foamed polystyrene, foamed polyethylene, foamed polypropylene, etc. are suitable, and as the non-foamed resin film or sheet,
Films or sheets made of thermoplastic synthetic resins such as polystyrene, high-impact polystyrene, and polyethylene are suitable.

Incidentally, in practice, the synthetic resin sheet for forming the container is not a foamed resin, and the same method as in the case of the foamed resin sheet can be applied to a container made of a non-foamed resin sheet.

Next, an example of a method for manufacturing a synthetic resin container is shown in FIG. 5, and will be described in order below.

The foamed resin sheet 10' is unwound from the unwinding section 40, fed into a press mold 60 through a preheating section 50, and press-molded into a container 10 made of a foamed resin sheet.

In addition, during the molding process using the press mold 60, a perforation 51 is formed in the lower mold of the press mold 60 at a portion where the small hole 14 is desired to be formed, and at the same time as the container 10 is press-molded, the perforation is The portion 51 penetrates the foamed resin sheet and forms a small hole 14 at a predetermined position.

On the other hand, a non-foamed resin film or sheet 20
is unwound from the unwinding part 100 and placed on the upper surface side of the container 10. This non-foamed resin film or sheet 20 has a display area 21 with a pattern etc.
(See Figure 1) is formed, and the heat-sealing mold 70
First, it is joined to the peripheral edge 13 of the container by heat fusion. Further, the non-foamed resin film or sheet 20 together with the foamed resin sheet container 10 are preheated in a preheating section 80 and then delivered to a vacuum forming section 90 .
In this vacuum forming section 90, a non-foamed resin film or sheet 20 is vacuum formed to be bonded to the inner surface of the container from the lower surface side of the container through small vacuum suction holes 14 formed in the bottom surface 11 etc. of the container 10. After vacuum forming, the containers are trimmed (not shown) to separate each container, similar to known forming methods.

Further, when manufacturing a container having a finish 30 inside as shown in FIG. 3, after the container 10 is molded from a foamed resin sheet, the partition 30 is joined to a predetermined position on the inner surface of the container.

In this case, the small hole 14 formed in the container 10 is the third
As shown in the figure, a large number of holes are formed not only at the boundary between the bottom surface 11 and the side surface 12, but also at the boundary between the partition 30 and the bottom surface 11. This is because air remains at the boundary between the partition 30 and the bottom surface 11 during vacuum suction, which tends to cause parts where the foamed resin sheet container 10 and the non-foamed resin film or sheet 20 do not bond.

It should be noted that the invention of the method for manufacturing a synthetic resin container is not limited to the above embodiments. For example, in order to improve the integrity of the foamed resin sheet container 10 and the non-foamed resin film or sheet 20,
A hot-melt adhesive may be applied to the inner surface of the container 10 made of foamed resin sheet to assist in thermal fusion, or
It is also possible to form the small holes 14 in a separate process from the molding of the container 10 from the foamed resin sheet.

Furthermore, instead of a container made of a foamed resin sheet, a similar manufacturing method can be adopted for a container made of a non-foamed resin sheet.

<Effects of the Invention> According to the synthetic resin container having the above structure, the above-described effects are achieved, and by forming small holes for vacuum suction in the synthetic resin sheet container in advance, the synthetic resin film or sheet This makes it easier to align the container inward from the top surface of the container, and it becomes possible to perform joint molding in which the display part, such as a pattern, is in a fixed position on the container. Therefore,
The container and the products stored in the container look good. This has the unique effect of increasing consumers' purchasing intentions.

In addition, the film or sheet is bonded to the periphery of the container by heat fusion, and is bonded to the inner surface of the container by vacuum forming, so the film or sheet is firmly bonded. There is no risk of peeling off when the container is used, and the film or sheet can be easily molded in position.

Further, according to the method for manufacturing a synthetic resin container of the present invention, a container made of a synthetic resin sheet is molded, and then only a synthetic resin film or sheet is molded by vacuum forming through small holes for vacuum suction provided in the container. Since the moldability problems due to differences in thickness and materials are bonded to each other, problems with moldability due to differences in thickness and materials are resolved, and display parts such as patterns do not shift from their fixed positions, making it easy and reliable to create composites with fixed position indicators. A unique effect is produced in that resin containers can be manufactured.

In addition, the synthetic resin film or sheet can be bonded to the peripheral edge of the synthetic resin container in advance before vacuum forming, and after bonding, vacuum forming can be performed to match the inner shape of the container. , a display portion such as a pattern on the film or sheet can be bonded to a fixed position on the container.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, Fig. 2 is a cross-sectional view of the embodiment shown in the previous figure, Fig. 3 is a perspective view of a modification of the embodiment, and Fig. 4 is a perspective view of the embodiment shown in the previous figure. FIG. 5 is a cross-sectional view showing an example of the manufacturing process of the synthetic resin container of the present invention. 10... Container, 11... Bottom, 12... Side,
14...Small hole, 20...Film or sheet on the bonding side, 21...Display portion of pattern etc., 60...
Press mold, 90...vacuum forming section.

Claims (1)

[Scope of Claims] 1. A container made of a synthetic resin sheet in which small holes for vacuum suction are formed in advance, and a synthetic resin film or sheet bonded to the upper surface side and having a display part such as a pattern, Alternatively, the sheet is bonded to the peripheral edge of the container by heat fusion, and is bonded to the inner surface of the container by vacuum forming, and the display portion is formed by vacuum forming through the small hole of the container. A container made of synthetic resin having a display part such as a pattern, which is arranged in a fixed position on the container. 2. A small hole for vacuum suction is formed in a container made of a synthetic resin sheet, and a synthetic resin film or sheet having a display area such as a pattern is placed on the top side of the container, and the pattern or pattern of the film or sheet is displayed. First, a film or sheet is bonded to the periphery of the container by heat fusion so that the part is in the fixed position of the container, and then vacuum forming is performed by vacuum suction from the bottom side of the container through a small vacuum suction hole in the container. A method for manufacturing a synthetic resin container having a display portion such as a pattern, characterized in that the above-mentioned film or sheet is bonded along the inner surface of the container.