JPH027824B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a skinned foam columnar article having a semicircular or semielliptic arc portion made of rubber or synthetic resin foam suitable as a sealing material, and a method for producing the same. .

Prior Art Conventionally, semicircular or semielliptic columns of rubber or synthetic resin foam have been manufactured using molds. In the case of rubber foam, it is thermoformed in a mold, and in the case of polyurethane, it is cast-molded by injecting liquid raw materials into the mold. However, since molding using these molds requires individual molds, large numbers of molds are required for mass production, which is not only expensive, but also makes continuous production impossible and inefficient. It is. Moreover, in the case of polyurethane products, there is a drawback in that the skin may peel off due to small changes in mold temperature.

In order to solve this drawback, the inventor of the present invention first bent a foam sheet with a rubber or synthetic resin skin into a semicircular or semielliptic shape with the skin facing outward, and then glued the folded inner surface with an adhesive. We have developed a method for continuously manufacturing semicircular to semielliptic skinned foam columnar molded products without the need for a mold.

However, according to this method, since it is a foam,
It was found that there were problems with workability and product homogeneity due to elongation during molding.

Purpose of the Invention The present invention aims to solve this problem.The purpose of the present invention is to eliminate the need for molds, enable continuous production, minimize elongation during molding, have good workability, and produce a uniform product. An object of the present invention is to provide a foam columnar molded article with a skin that can be used to manufacture products, and a method for manufacturing the same.

Structure of the Invention As a result of research to achieve the above object, the present inventor has
If a foam sheet with a skin of rubber or synthetic resin is continuously bent into a semicircle or semi-ellipse with the skin facing outward, and an anti-stretching material is incorporated into the folded inner surface and the inner surface is adhered, the elongation during molding will be prevented. There is no
The inventors have discovered that it is possible to efficiently produce homogeneous columnar objects, and have completed the present invention based on this knowledge.

The skinned foam 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 foam columnar molded article of the present invention, and FIG. It is a drawing showing an embodiment.

In Fig. 1, 1 is the epidermis, 2 is a rubber or synthetic resin foam (hereinafter simply abbreviated as foam), and 3 is a rubber or synthetic resin foam.
4 indicates the bottom surface, 4 indicates the adhesive layer, and 5 indicates the anti-stretching material. The shape of the foam 2 may be not only a semicircle but also a semiellipse or a cylindrical shape connected thereto, or may be an open cell or a closed cell. The foam may be natural rubber, synthetic rubber foam, polyolefin foam such as polyethylene, polypropylene, polyethylene, propylene, polyurethane, etc., or if the purpose is a sealant, polyurethane made from hydrophobic polyol, e.g. Polybutadiene-based polyurethane and dimer acid-based polyurethane are preferable because they have a large sealing effect.

The skin 1 may be made of the same material as the foam, or may be made of a different material. In order to produce the skin 1 of the same material, it can be obtained by making a foam sheet of polyvinyl chloride, polyurethane, etc. on a material having releasability such as release paper, and then peeling it off. In addition, to generate a heterogeneous skin, for example, a foam is made in the shape of a block, sliced into sheets, and a soft film such as polyurethane, polyvinyl chloride, or polybutadiene film is laminated on the surface of the sheet. You can get it. Adhesive layer 4 is a general-purpose adhesive on the inside surface of the folded sheet.
It may be formed by applying a hot melt adhesive or the like, or by interposing an adhesive tape, such as a double-sided adhesive tape.

The elongation prevention material 5 prevents the columnar object from elongating in the length direction during manufacturing or use.
For example, cotton threads, threads made of synthetic fibers, strings made from these threads, etc. may be used as long as they have an elongation-preventing effect.

The second method for producing a foamed columnar molded article with a skin of the present invention
This will be explained using figures. Reference numeral 20 denotes a foam sheet with a skin, the skin 1 is placed on the bottom surface of the sheet, one side of the double-sided adhesive tape is pasted on the top surface of the foam sheet, and the release paper 8 is peeled off with a release roll 9, and the peeled release paper 8 is It is wound up on a winding roll 7. 10 indicates a back roll. The skinned foam sheet 6 holding the adhesive layer on the upper surface is introduced into a V-shaped pulley 12, and at the time of this introduction, the thread 5 is guided from the thread bobbin 11 to the center of the width of the sheet and adhered onto the adhesive.
By pressing with a pulley 12 to form an adhesive layer 4, a semicircular or semielliptic skinned foam 13 having an anti-elongation material (thread) 5 therein is formed.
Guide the adhesive tape onto the bottom surface 3 of the foam 13 from the double-sided adhesive tape roll 19, removing the release paper 8,
Adhesive tape is pasted using a pressure roll 15 and a back roll 14.

Rolls 18 and 17 provide a nip action, and the product 21 is pulled out by these rolls.
As a result, a skinned foam columnar molded product having an adhesive layer on the bottom surface is obtained. When no adhesive layer is provided on the bottom surface, no adhesive tape is supplied from the double-sided adhesive tape roll.

In the above method, a hot melt adhesive can be used instead of a double-sided adhesive tape to produce the same result. Further, after forming a semicircular or semielliptic skinned foam columnar body, it may be cut using a cutting knife in order to make the bottom surface smooth.

The skinned foamed columnar molded article of the present invention is composed of a semicircular or semi-elliptic columnar body made of rubber or synthetic resin foam, the arcuate part of which is covered with the skin, and the top part of which extends along the columnar shape at approximately 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.
Furthermore, from a foam sheet that has a skin on one side, it is easy to obtain one that has at least a skin on the arcuate part, and even for foam sheets with little skin, the sheets that serve as the skin can be attached continuously, making it easy to manufacture them. It is.

In addition, in particular, since the adhesive layer contains an anti-elongation material, it is possible to prevent the foam from elongating during transportation during manufacturing, and it is possible to eliminate the drawbacks that occur when it is difficult to obtain a homogeneous product due to this elongation. Furthermore, the lengthwise elongation of the obtained product can be suppressed, and it can be easily set to a constant length when used as a sealant. For example, it is effective when used in air conditioner blowers and cleaning units.

Moreover, when the product of the present invention is used as a packing material, the skin is on the outer surface, so the sealing effect is great, and since the product is semicircular or semi-elliptical, it can be pressed diagonally from the side to the part to be sealed. , it can be set stably without falling sideways. Furthermore, since there is an adhesive layer at the center of the bottom surface of the molded body toward the top, when it is compressed from the top surface, the adhesive layer moves like a spring, allowing the molded body to be brought closer together, 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.

Furthermore, when the foam is made into open cells, it is very flexible, so it can be easily bent even at corners, and it can be brought into close contact easily, improving sealing performance, and other excellent effects can be achieved. .

[Brief explanation of drawings]

FIG. 1 is a side view of a foamed columnar molded article with a skin of the present invention, and FIG. 2 is a side view of an embodiment of an apparatus for producing a foamed columnar molded article with a skin of the present invention. 1: Epidermis, 2: Rubber or synthetic resin foam,
3: Bottom surface, 4: Adhesive layer, 5: Elongation prevention material (thread),
6: Foam sheet with a skin that holds an adhesive layer on the surface,
7: Winding roll, 8: Release paper, 9: Release roll, 10: Back roll, 11: Elongation prevention material (thread) bobbin, 12: V-shaped pulley, 13: Foam with skin containing thread, 14: Back roll, 15: Press roll, 16: Double-sided adhesive tape,
17: Nippro roll, 18: V-shaped pulley and Nippro roll, 19: Double-sided adhesive tape wrapped roll, 2
0: Foam sheet with skin, 21: Foam columnar molded product with adhesive tape.

Claims (1)

[Scope of Claims] 1. Consisting of a semicircular or semi-elliptical columnar body made of rubber or synthetic resin foam, the upper surface portion with an arcuate portion is covered with a skin, and the columnar body is approximately perpendicular to the center portion of the bottom surface along the columnar shape. A foam columnar molded article with a skin, which has an adhesive layer that faces toward the top and does not reach the top, and has an anti-elongation material embedded in the adhesive layer. 2. A foamed columnar molded article with a skin according to claim 1, which is provided with an adhesive tape on the bottom. 3 A skinned foam sheet made of rubber or synthetic resin is bent into a semicircle or semi-ellipse with the skin facing outward, an anti-stretching material is inserted into the inner surface, and the folded inner surface is bonded with an adhesive. A method for producing a foam columnar molded body.