JPS63104820A - Molding method for composite container - Google Patents

Abstract

PURPOSE:To mold a composite container having superior integrity of a container main body and a piece of paper and superior reinforcing effect by folding the edges of a developing-shaped piece of paper and loading the same into a female mold, and then pushing a foamed sheet, heated and softened, into the female mold by a male mold for molding the same, and simultaneously integrating the piece of paper and the foamed sheet. CONSTITUTION:A sheet-shaped piece of paper 2 is supplied right over a female mold 1 having a molding section 1a, over which a thermoplastic resin foamed sheet 3 such as a foamed polystyrene sheet, heated up to a specific temperature and softened, or the like is supplied. Then, by advancing a suction component 6 from the bottom of the female mold 1 to vacuum suck and draw the piece of paper 2 into the female mold 1 and contacting the piece of paper with the peripheral wall of the molding section 1a of the female mold, a side wall piece 2c can be loaded in while being raised and folded. Further, a plug mold 7 as a male mold for pressurizing means is advanced from the upper side of the foamed sheet 3, and pushes the foamed sheet 3 into the molding section 1a of the female mold 1 to be molded in the form of a basin along the molding section 1a and the piece of paper 2. The piece of paper 2 is coated with an adhesive 4 beforehand.

Description

[Detailed Description of the Invention] Technical Field> The present invention relates to a method for molding a composite container, and more specifically, to 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. Regarding the method.

<Prior art> Conventionally, containers made of foam sheets for storing foods, etc. have been printed with bar codes, etc. that display information such as patterns, trademarks, product names, product types, prices, etc. on the outer periphery of the containers. things are being done.

However, when printing directly on the foam sheet surface, there is a problem in that the 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 above-mentioned method for manufacturing a composite container using paper and a foamed sheet involves forming a container body into a sheet, and then wrapping and bonding a strip of paper around the outer periphery of the container body.

<Problems to be Solved by the Invention> According to the above-described manufacturing method, since the paper is attached after the fact, the paper creates a step on the outer periphery of the container, which lacks a sense of unity and is unfavorable in appearance. There have been reports that it is difficult to bring the paper and the paper into close contact, and sufficient integrity cannot be ensured, 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 join the paper over a wide range including from the top to the bottom.

Purpose of this invention The present invention has been made in view of the above points, and it is a composite material that does not have any steps on the surface of the container, has a good appearance, has excellent integrity between the container body and paper, and has an excellent reinforcing effect. It is an object of the present invention to provide a method for forming a composite container that allows the container to be easily and inexpensively manufactured.

Means for Solving the Problems> The method for forming a composite container of the present invention to achieve the above object includes vacuum-adsorbing paper in a developed shape to a retractable member advanced from the innermost part of a female mold. At the same time, the retracting member is moved back to the inner part of the female mold, the paper is loaded into the female mold while bending the peripheral edge of the paper, and then the heated and softened foam sheet is inserted into the female mold by the male mold. The paper is pressed into a predetermined shape, and at the same time, the paper and foam sheet are joined and integrated.

<Example> Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments.

FIG. 1 is a process diagram showing the method for molding a composite container according to the present invention, illustrating the case of molding a rectangular deep dish-shaped composite container.

First, as shown in FIG. 1A, a sheet of paper (2) is supplied directly above the female mold (1) having the molding part (1a), and a sheet of paper (2), which has been softened by being heated to a predetermined temperature, is placed on top of it. , a foamed sheet (3) of thermoplastic resin such as a foamed polystyrene sheet is supplied. As shown in Fig. 2, the above-mentioned paper] 2) is a semi-punched product with non-cut parts (2a) provided at important points, and the punched outline consists of a bottom piece (2b) and a side wall piece (2). 2c
) has been achieved in the developed shape. Also, paper (2
), which is the upper surface of the foam sheet (3),
A hot melt type adhesive 4) is applied. Note that the paper (2) is held in a removable manner by a clamp (5) provided on its outer circumferential side. On the other hand, the foamed sheet (3) is made of a long belt-like sheet, which is unrolled from the unrolled sheet at predetermined intervals, heated and softened, and then fed in a direction parallel or perpendicular to the feeding direction of the paper (2). Running supply from. Furthermore, there is paper (
A suction member b) that can extend toward the opposite side is arranged flush with the inner inner part.

Next, the suction member (6) is advanced from the bottom of the female mold (1) to vacuum suck the supplied paper (2) (see Figure 1C), and the retraction member (61) is moved back. Then, pull the paper] 2) into the female mold (1). This attraction is
Continue until the retracting member (6) is flush with the bottom of the molding part (la) of the female mold (13).As a result of the above, the paper (2) is
The uncut part (2a) will be cut and loaded into the molding part (1a) of the female mold (1). At this time, the side wall piece (2c) of the paper (2) comes into contact with the peripheral wall of the female molding part (1a), so the paper [2] can be loaded while the side wall piece (2c) is raised and bent. (See Figure 1C). Note that during the above loading, if the paper (2) is vacuum-suctioned through the suction port (lb) of the female mold (1), the paper (2) can be loaded more reliably.

Furthermore, in the above state, from above the foam sheet (3),
The plug mold (7) as a male mold, which is a pressurizing means, is advanced, and the foam sheet [3] is pushed into the molding part (1a) of the female mold (1), and the foam sheet [3] is pressed into the molding part (la) and the paper]2). Shape it into a deep dish shape (see first diagram). At this time, paper (2)
Since the adhesive (4) is applied to the foam sheet (3) in advance, the paper [a] can be bonded to the foam sheet (3) and firmly integrated at the same time as the foam sheet (3) is formed. Note that during the above molding, the peripheral edge of the foamed sheet 3) is clamped by a clamp member (8) as necessary.

In addition, compressed air such as hot air may be fed from behind the foam sheet (3). In this case, the entire molded part of the foam sheet] 3) can be pressurized, so the paper (2) and the foam The sheet (3) can be brought into close contact with the molded part (la) more reliably.

Then, the opening edge of the foam sheet (3) molded as described above is trimmed while it is attached to the female mold (1) or after the mold is released.
) A composite container (10) can be manufactured in which paper (2) is laminated on the side wall and bottom of a container body (10a) formed of (see FIG. 3).

The composite container (lO) obtained in the above manner is a foam sheet [
Paper (2) is laminated at the same time as forming (3), so paper (2)
The outer surface of the paper (
2) There is no step difference, and a good sense of unity is created, resulting in a beautiful appearance. In addition, the container body (lea) can exhibit good heat insulation and moldability similar to conventional foam sheet containers, and the paper (2) provides good printability that conventional paper containers have. , 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 (10a) and the paper (rito) are integrally molded, the bonding strength is much higher than when the paper (2) is laminated after the fact. It also has excellent durability.Moreover, it is possible to easily manufacture the composite container (1O).

Note that the foam sheet (
3) In addition to the above-mentioned expanded polystyrene sheets, various thermoplastic resins such as copolymers of polystyrene and other resins, high-impact polystyrene, polypropylene, polyethylene, vinyl chloride, MMA, etc. are used in the same way as conventional packaging containers. Foam sheets can be used.

In addition, the outer shape of the container body (10a) may be a rectangular deep dish shape as shown in the figure, or may be polygonal, circular, or other various container shapes. The present invention is particularly suitably applied as a method for forming a composite container (IO) having a relatively flat shape with a bottom area larger than its height.

On the other hand, as the paper (2), various papers such as kraft paper, which are used as ordinary packaging materials, can be used. but,
This is preferable since it can enhance the integrity with the container body (10a). As the above-mentioned adhesive, a thermoadhesive adhesive that exhibits an adhesive effect by the heat during molding is suitable, but in addition, pressure-sensitive adhesives that exhibit an adhesive effect by the pressure applied during molding, and , etc. Other adhesives can also be used. Further, as the paper [2], it is also possible to use paper that is completely punched out without providing the non-cut portion (2a). In addition, paper (
A bending groove such as a concave groove or a perforated groove may be formed in the bent portion of 2), and in this case, the bending can be performed more accurately and easily.

Furthermore, use paper ('2J', which has ventilation parts that allow air to pass through, such as the folded part, and foam paper).
(3) During the molding, the female mold is inserted through the ventilation section]
The foam sheet (3) may be vacuum-suctioned from the suction port (lb) of 1).

The method for forming a composite container of the present invention is not limited to the above-mentioned embodiments. Various changes may be made without changing the gist of the invention, such as using a foam sheet (31) in the form of a veneer cut to a predetermined size, or using the above plug type (a male type other than a sword). be able to.

<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 to each other, resulting in strong joint strength and ease of use. A container with excellent durability over time can be obtained. Furthermore, it is possible to obtain a container that does not have any steps caused by the paper on the outer periphery, exhibits a good sense of unity, and has a suitable appearance. In addition, due to the paper on the surface,
Good printability, tear resistance, heat resistance, etc. can also be ensured.

Furthermore, it is easier to manufacture than the case where paper is laminated after the fact, and various excellent effects such as being able to reduce the manufacturing cost of the composite container can be achieved.

[Brief explanation of the drawing]

Figure 1 is a process chart showing the method for forming a composite container of the present invention, in which A shows the paper and foam sheet supply process, B shows the paper vacuum-adsorbed, and C shows the paper drawn into the female mold. State and D indicate the molding process of the foam sheet, respectively. Figure 2 is a perspective view of the paper, and Figure 3 is a perspective view of the composite container. (1)...Female mold (2)...Paper (3)...
・Foam sheet (4)...Adhesive (6)...Retracting member ]7)...Plug type as male type (10)...
・Composite container (10a)...Container body, patent applicant Sekisui Plastics Co., Ltd. Figure 1-〇Figure 1-D

Claims (1)

[Claims] 1. Container made of thermoplastic resin foam sheet The surface of the container body has a layer of paper on it. A method of forming a container, which is a developed form. A piece of paper was advanced from the inner part of the female mold. In addition to vacuum adsorption to the retractable member, Retract the retracting member deep inside the female mold, Insert the paper into the female mold while folding the periphery of the paper. The foamed silicone is heated and softened after being loaded into the Push the tip into the female mold using the male mold. At the same time as forming into the specified shape, paper and foam are formed. The special feature is that it joins and integrates the sheet. A method for forming a composite container. 2. Pre-apply the bonding surface of the paper to the foam sheet. According to the above patent claim, the adhesive is applied. A method for forming a composite container according to scope 1. 3. When forming the foam sheet, Compressed air is supplied from behind to create a foam sheet. Pressure is applied as described in claim 1 above. A method for forming composite containers.