JPS60137627A - Foamed cylindrical formed object with skin and process thereof - Google Patents

Abstract

PURPOSE:To obtain a cylindrical formed body that is made up from rubber or synthetic resin foamed body, semicircular or semieliptical in the section, is covered with skin on the curved surface and filled with adhesive agent from the middle of the flat surface to the middle of the top. CONSTITUTION:A foamed sheet 5 with skin is carried by a conveyor roll 10 with its skin side downward and adhesive agent is applied to its upper surface (adhesion of adhesive sheet 13b or application of adhesive agent, etc.), and then folded by a guide roll 7 into two. Then its upper end section is cut by a cut knife 11 to form a flat plane. Thereafter, if necessary, an adhesive tape 13 is stuck to the flat surface section. In this way, the cylindrical formed body obtained is semicircular or semieliptical in the section, the curved surface of the internal foamed body 2 is covered with the skin 1, and adhesive agent 4 is contained from the middle of the flat surface to the middle to the top of the curved surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a skinned foamed columnar molded article made of rubber or synthetic resin foam having a semicircular or semicircular arcuate portion, and a method for producing the same.

Conventionally, semicircular to key-circular columnar foamed bodies made of rubber or synthetic resin have been manufactured using a mode mold. In the case of rubber foam, it is thermoformed in a mold, and in the case of polyurethane foam, liquid raw materials are injected into the mold and cast molding is performed.

However, since molding using these metals requires individual molds, it is not only expensive as it requires a large number of molds for mass production, but also continuous production is impossible and inefficient. Moreover, in the case of polyurethane products, there is a drawback that the skin may peel off, especially due to small changes in mold temperature.

The present invention aims to overcome the drawbacks of these conventional methods, and its purpose is to provide a skin with an arcuate part that does not require a mold, can be manufactured continuously, and has less damage to the skin. There is K, which provides a semicircular to semicircular columnar molded article of a foamed article and a manufacturing method thereof. Another object of the present invention is to provide a columnar foam having a semicircular or semicircular arcuate portion that has an excellent sealing effect.

In order to achieve the above object, the present inventors conducted research and found that a rubber or synthetic resin skinned foam sheet was continuously folded into a semicircular or semicircular shape with the skin facing outward; By bonding the inner surface with adhesive, the arcuate part of the foam is covered with a skin, and it has excellent sealing properties with an adhesive layer that extends along the columnar shape, almost perpendicular to the center of the bottom surface, and does not reach the top. It was found that the molded body can be easily manufactured and obtained. The present invention was completed based on this knowledge.

The skinned foamed columnar molded article of the present invention and its manufacturing method will be explained based on the drawings. FIG. 1 is a side view of the skinned foamed columnar molded article of the present invention, FIGS. 2, 3, and 4 are: All are drawings showing embodiments of the molded body manufacturing apparatus of the present invention.

In FIG. 1, 1 is a skin, 2 is a rubber or synthetic resin foam (hereinafter simply referred to as foam), 3 is a bottom surface, and 4 is an adhesive layer. The shape of the foam 2 may be not only a semicircle but also a semicircular shape or a shape in which a cylindrical portion is connected to the shape, or an open-celled or closed-celled shape. The foams include natural rubber, synthetic rubber foam, and polyethylene.

When intended for use as a gel olefin foam such as polypropylene, polyethylene/propylene, or urethane, or as a sealant, it is preferable to use a hydrophobic polyol as a raw material, or a urethane such as polybutadiene polyurethane or dimer acid polyurethane. . The skin 1 may be made of the same material as the foam, or may be made of a different material.

K, which produces a skin of the same substance, can be obtained by making a foam sheet on top of polyvinyl chloride, polyurethane, etc., using a release paper or the like, and then peeling it off.

In addition, to generate a heterogeneous skin, for example, make a foam in the form of a block, cut it into sheets, and laminate a soft film such as urethane, polyvinyl chloride, polybutadiene, etc. on the surface of the sheet. obtained by doing. The adhesive layer 4 may be formed by applying a general-purpose adhesive or a hot melt adhesive to the folded inner surface of the sheet, or by interposing an adhesive tape such as a double-sided adhesive tape.

Next, an embodiment of an apparatus for manufacturing a skinned foam columnar molded article of the present invention will be described.

FIG. 2A is a plan view of the device, and FIG. 2B is a side view thereof. In the figure, reference numeral 5 denotes a foam sheet with a skin, the skin is placed on the bottom surface, and an adhesive tape 13 with a release paper 13a applied to the adhesive layer 13b is supplied from an adhesive tape roll 12 onto the top surface of the foam sheet to create a sticky layer.
The f layer 13b is applied and the release paper 13a is peeled off. The skinned foam 5 on which the adhesive layer has been applied is conveyed through a conveyor port 10, bent inward by forming rolls 6 and 6', and formed into a semicircular or semicircular shape by side rolls 7. , the product 8 is obtained by being compressed and bonded by a compression roll 9. A cutting knife may be used to flatten the bottom surface if necessary.

Figure M3 shows a device for applying adhesive to the inner surface of a foam with a skin; Figure 3A shows a plan view, and Figure 3B shows a side view. The skinned foam sheet 5 is conveyed by a conveyor roll 10, and is bent inward by a forming roll 6°6'. At the end of the opening, an adhesive liquid 14, such as a hot melt adhesive liquid, is supplied from a transport hose 15 to apply the adhesive to the inner surface, and then compressed and bonded by a compression roll 9. If necessary, the bottom surface may be cut with a cutting knife.

FIG. 4 shows an apparatus for applying adhesive tape to the bottom surface of the product 8 after cutting it into a flat shape. After removing the bottom surface of the product 8, an adhesive tape consisting of an adhesive layer 13b and a release paper 13a is applied to the cut surface. 13 is supplied from the adhesive tape roll 12, and is pressed with the pressure roll 17 to attach the adhesive layer 13b of the adhesive tape, to obtain an adhesive tape-attached product 18. When using this, it can be used for adhesion to the other substrate by peeling off the release paper, and also acts to reinforce the adhesive layer. Therefore, it is preferable to use adhesive tape on the bottom of the product, and if convenient, to attach adhesive tape in this way.

The skinned foamed columnar molded article of the present invention consists of a semicircular or key circular columnar body made of rubber or synthetic resin foam, the arcuate part is covered with the skin, and the top part is formed along the columnar shape at almost right angles to the center of the bottom surface. Since it has an adhesive layer that does not reach the top, it does not require a mold and can be manufactured easily and continuously.

From a foam sheet that still has a skin on one side, it is easy to obtain one that has at least a skin on the arc, and even for foam sheets that do not have a skin, it is possible to continuously attach the sheet that will become the skin, so it is easy to manufacture them. It's easy.

Moreover, when the product of the present invention is used as a backing material, the skin is on the outer surface, so the sealing effect is great.
Since the shape is semicircular or semicircular, it can be stably set without falling sideways when it is pressed obliquely from the side to the part to be sealed. Furthermore, since there is an adhesive layer at the center of the bottom of the molded body toward the top, when the molded body is compressed from the top, the adhesive layer acts as a spring and allows the molded body to be brought into closer contact with the molded body, thereby increasing the sealing effect.

In other words, since the product of the present invention has an adhesive layer in the center, it has a great sealing effect, and at the same time, it has rigidity in the direction parallel to the adhesive layer, which increases the adhesion to the surface to be sealed, and at the same time, it has rigidity in the direction parallel to the adhesive layer. It is flexible in the direction of movement, and has great fit around curved parts.

In addition, when foam is used as a continuous cell, it is very flexible, so it can be easily used in corners.
In addition, it is easy to make a close contact, and an excellent effect of improving the sealing performance can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view of the skinned foam columnar molded product of the present invention, Figure 2
Figures 3 and 4 show embodiments of the molded body manufacturing apparatus of the present invention, and each figure in Figures 2 and 3 is a plan view thereof, and each B is a side view thereof. FIG. 4 shows an apparatus in which adhesive tape is provided on the bottom surface. 1: Skin, 2: Foam, 3: Bottom surface, 4: Adhesive layer, 5: Foam sheet with skin, 6.6': Forming roll, 7: Guide roll, 8jIi
Item i, 9: Compression roll, 10: Conveyance roll, 11: Cut knife, 12: Adhesive tape roll, 13: Adhesive tape, 13a: Release paper,
13b: Adhesive layer, 14: Adhesive liquid, 15: Transportation hose, 16: Cut piece, 17: Pressure roll, 18: Product with adhesive tape. Patent applicant: NHK Spring Co., Ltd.

Claims (1)

[Scope of Claims] Consisting of a semicircular or cylindrical body made of rubber or synthetic resin foam, the upper surface with an arc-shaped portion is covered with a skin, and the bottom surface extends along the columnar shape. A foamed columnar molded article with a skin, which has an adhesive layer that faces the top at almost right angles to the center and does not reach the top. 2. A skinned foamed columnar molded article O as set forth in claim 1, comprising an adhesive tape on the bottom. 1. A method for producing a foamed columnar molded article with a skin in a semicircular or semicircular shape, which comprises folding it into a circular or semicircular shape and bonding the folded inner surface with an adhesive. .