JP2002292742A - Adhesion method for foamed plastic sheet, coating method for the sheet, article to which the sheet is adhered, and article coated with the sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adhere a foamed plastic sheet to a substrate easily and surely in a short time without using an adhesive. SOLUTION: The foamed plastic sheet 3 having closed cells is arranged on the surface of the substrate or between the two substrates, pressed, and heated to soften the surface of the sheet 3 and to expand the closed cells. The softened plastic is made to penetrate into the minute gaps of the surface of the substrate to adhere the sheet 3 to the substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to fabrics, non-woven fabrics, felts, plastic foams, cork, wood, leather,
The present invention relates to a foamed plastic sheet bonding method and a foamed plastic sheet coating method suitable for cotton, synthetic leather, metal foil and the like, and a foamed plastic sheet bonded article and a foamed plastic sheet coated article.

[0002]

2. Description of the Related Art Generally, an adhesive is used to attach a cloth to the surface of a sheet-like member such as urethane foam. That is,
An adhesive is applied between the above-mentioned member and the cloth covering the surface, and the members are bonded.

[0003] Specifically, an adhesive is applied to the surface of a sheet-like member or the like, and a cloth or a sheet-like member is overlapped and pressed against the surface. Thereafter, the adhesive is left to dry and harden.

There is also a method in which a stick-like, film-like, or non-woven fabric-like hot melt adhesive made of EVA, nylon, polyolefin-based resin, or the like is applied to the surface of an object to be bonded while being softened, and bonded.

[0005]

However, the above-described structure requires a work of applying and bonding the adhesive and a step of drying the adhesive after the bonding, which causes a problem that the workability is poor.

[0006] In the case of hot melt, even if it is pressed uniformly on the surface of the object to be bonded, it does not penetrate into minute gaps on the surface of the object. In particular, when a thin film-shaped object is bonded to an adhesive object having unevenness on the surface, the thin film-like object is in contact only with a part of the protrusion, and is bonded almost in point contact. For this reason, there is a problem that it is easily peeled. Further, if the hot melt is applied thickly, the weight increases and the cost increases.

The present invention has been made in view of the above points, and is a lightweight foamed plastic that can be easily and securely bonded in a short time without using a conventional adhesive or a film forming material. It is an object of the present invention to provide an adhesive method and an adhesive article using a sheet, and a film forming method and an article using a foamed plastic sheet.

[0008]

According to a first aspect of the present invention, there is provided a method for bonding a foamed plastic sheet, comprising the steps of:
It is sandwiched between two objects to be bonded and heated by heating to soften the surface of the foamed plastic and expand closed cells, so that the softened plastic penetrates into the minute gaps on the surface of the object to be bonded and is bonded. .

According to the above configuration, when the foamed plastic is heated, the gas in the closed cells is also heated and expands. At this time, since there is no escape route for the gas in the closed bubble, the closed bubble itself expands. As a result, the foamed plastic film expands and is pressed against the surface of the object to be bonded. At this time, the pressure of the foamed plastic film on the surface of the object to be bonded is mainly the pressure at which the individual closed cells expand. Therefore, instead of applying a uniform pressure to the surface of the object to be bonded,
Acts as a set of individual closed cell pressures. In other words, one closed cell expands and expands the surrounding softened foamed plastic film to the surroundings. The foamed plastic film penetrates deeply into a minute gap (including an uneven surface) on the surface of the object to be bonded in a wedge shape. Thus, the two objects to be bonded can be easily and reliably bonded with the foamed plastic in a short time.

In the method of coating a foamed plastic sheet according to a second aspect of the present invention, the foamed plastic mixed with closed cells is pressed against the surface of the object to be coated and heated to soften the foamed plastic surface and expand the closed cells. It is characterized in that the softened plastic penetrates into the minute gaps on the surface of the object to be coated and adheres to form a film.

[0011] With the above configuration, similarly to the first aspect, the surface of the foamed plastic is softened by heating, and the closed cells inside expand, so that the foamed plastic is pressed against the object to be coated. As a result, the foamed plastic having a softened surface penetrates deeply into the minute gaps (including the uneven surface) on the surface of the coating object and functions as a wedge. As a result, the foamed plastic can be easily coated on the object to be coated in a short time.

[0012] The foamed plastic sheet bonding method according to a third aspect of the present invention is a method of bonding foamed plastic in which closed cells are mixed, to a surface of one of the objects to be bonded in advance and heating.
By softening the foamed plastic surface and expanding closed cells, the softened plastic penetrates and adheres to the minute gaps on the surface of the bonded object to form a film, and the other bonded object is superimposed on the foamed plastic at the site. It is characterized in that it is pressed, heated, and adhered to each other.

According to the above configuration, the work can be easily performed by previously bonding the foamed plastic to one of the two objects to be bonded to each other at a factory or the like. Then, the work can be greatly improved by carrying it directly to the site and bonding the other object to be bonded by pressing, heating and bonding at the site.

A foamed plastic sheet adhesive article according to a fourth aspect of the present invention is a foamed plastic sheet containing closed cells, which is sandwiched between two objects to be bonded and pressed and heated.
It is characterized in that the foamed plastic surface is softened and the closed cells are expanded, so that the softened plastic penetrates and adheres to the minute gaps on the surface of the object to be bonded.

According to the above configuration, the foamed plastic can be deeply penetrated into the minute gaps (including the uneven surface) on the surface of the object to be bonded in a wedge-like manner, and the two objects to be bonded can be easily and reliably made in a short time with the foamed plastic. It is adhered to.

In the foamed plastic sheet coated article according to the fifth invention, the foamed plastic mixed with closed cells is pressed against the surface of the object to be coated and heated to soften the foamed plastic surface and expand the closed cells. In addition, the softened plastic is made to penetrate into the minute gaps on the surface of the object to be coated and adhered to form a film.

With the above structure, the foamed plastic having a softened surface penetrates deeply into the minute gaps on the surface of the object to be bonded and functions as a wedge, and easily and reliably adheres the foamed plastic to the object to be coated in a short time. It is made into a film.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment Foamed Plastic Sheet First, a foamed plastic sheet according to the present embodiment will be described.

The foamed plastic sheet is formed by using polyethylene, polypropylene, PVC, EVA or the like as a material to form a foamed sheet. In this foamed plastic sheet, closed cells are mixed.

In addition to the conditions described below, each closed cell has a certain thickness so that it can expand sufficiently without being broken. In addition, the reason why closed cells are used instead of open cells is that, in the case of open cells, even if heated, the gas inside escapes and the bubbles hardly expand. In the case of closed cells, since the gas is confined inside, when heated, the gas expands and the bubbles expand like a balloon. That is, secondary foaming occurs. For this reason, when the film of the foamed plastic sheet is pressed against the surface of the object to be bonded and heated, the melted plastic on the sheet surface is pressed against the surface of the object to be bonded and penetrates into the minute gap. At this time, what causes the foamed plastic sheet to penetrate the bonding object is mainly the pressure at which the individual closed cells expand. For this reason, a uniform pressure is not applied to the surface of the object to be bonded, but acts as a set of pressures of the individual closed cells. In other words, one closed cell expands the surrounding softened foamed plastic film by expanding. In addition, there are countless closed cells, each of which pushes the foamed plastic to the surroundings, so that the foamed plastic penetrates into the minute gaps on the surface of the object to be bonded in a deep wedge shape and in various directions.

The density and thickness of the foamed plastic sheet depend on the strength, texture,
Set appropriately according to the texture and the like.

FIG. 1 shows an example. This figure is an example in which a thick sheet-like urethane foam 1 and a cloth 2 are bonded. When the foamed plastic sheet 3 is sandwiched between the urethane foam 1 and the fabric 2 and pressed and heated, the urethane foam 1 and the foamed plastic sheet 3 and the fabric 2 and the foamed plastic sheet 3 adhere to each other. This state is shown in FIGS.

FIG. 2 is an enlarged sectional view of a main part showing a state of adhesion between the urethane foam 1 and the foamed plastic sheet 3. FIG. 3 is an enlarged cross-sectional view of a main part showing a bonding state between the cloth 2 and the foamed plastic sheet 3.

In the case of bonding between the urethane foam 1 and the foamed plastic sheet 3, as can be seen from FIG. 2, the foamed plastic enters the gaps between the cells of the urethane foam 1. In addition, the bubbles penetrate deeply into the gaps between the bubbles in a wedge shape. As a result, they are securely bonded.

In the case of bonding between the fabric 2 and the foamed plastic sheet 3, as can be seen from FIG. 3, the foamed plastic penetrates into fine gaps between the fibers of the fabric, bites into a wedge shape and becomes entangled with the fibers.

FIG. 4 shows another example. This figure is an example in which the urethane foam 5 and the foamed plastic sheet 3 are bonded. In this case, the foamed plastic sheet 3 is used not for bonding the two sheet materials but as a coating for protecting the surface of the urethane foam 5.

In this case, on one side of the foamed plastic sheet 3, the foamed plastic penetrates deeply into the gap between the cells of the urethane foam 1 in a wedge-like manner as in FIG.

On the other side of the foamed plastic sheet 3,
The bubbles are crushed to some extent, and a foamed plastic layer having a constant thickness is formed on the entire surface. Thereby, the strength of the surface of the foamed plastic sheet 3 is increased, and the function as a coating is improved.

[Method of bonding foamed plastic sheet] Next, a method of bonding the foamed plastic sheet will be described.

In the method of bonding a foamed plastic sheet of the present embodiment, the foamed plastic sheet is pressed against the surface of the object to be bonded or the surface of the object to be coated and heated to melt the surface of the sheet and to expand closed cells. The melted foamed plastic is allowed to penetrate into the minute gaps on the surface of the object to be bonded and is bonded. Specifically, the foamed plastic sheet 3 is covered on the object to be bonded and hot pressed. The press surface is subjected to a surface treatment such as Teflon (registered trademark) processing, or a release film, a release plate or the like is used to improve the releasability of the foamed plastic sheet.

The temperature for heating the foamed plastic sheet 3 is set at 130 to 200 ° C. This is a temperature at which the surface of the heated foamed plastic sheet can be appropriately softened and the inside closed cells can be expanded to some extent. It is set according to conditions such as the thickness of the foamed plastic sheet 3.

The time for pressing the foamed plastic sheet 3 onto the surface of the object to be bonded is set to 15 seconds to 2 minutes. this is,
The time is such that the surface of the foamed plastic sheet 3 is appropriately melted and the inside closed cells are expanded to some extent so that the foamed plastic can penetrate into the minute gaps on the surface of the object to be bonded. This time is appropriately set according to conditions such as the thickness of the foamed plastic sheet 3 and the thermal conductivity.

The force for pressing the foamed plastic sheet 3 onto the object to be bonded is appropriately set according to the thickness and hardness of the object to be bonded and the foamed plastic sheet 3, the material of the sheet to be bonded, and the like. As described above, the pressure for supporting the permeation phenomenon of the foamed plastic due to the expansion of the closed cells works more than the pressure for directly bonding the object to be bonded and the foamed plastic sheet 3 as described above.
For this reason, when the object to be bonded is a soft urethane foam or the like, the pressure when the foamed plastic sheet 3 is pressure-bonded becomes very small. In addition, as shown in FIG.
In the case of full-surface bonding, air vent holes are provided in the cloth 2 and the foamed plastic sheet 3 to facilitate the restoration of the urethane foam 1 or the like that has shrunk by pressing. Further, the air vent hole may be provided after the urethane foam 1 or the like is compressed and compressed. An air vent such as a needle hole may be provided as needed. Further, a spacer (not shown) is provided so that the urethane foam 1 and the like are not crushed at the time of pressing.

When the foamed plastic sheet 3 is pressed and heated at the above-mentioned set temperature and set pressure for a set time, the surface of the foamed plastic sheet 3 begins to melt, and the closed cells inside expand thermally. Is pressed against the object to be bonded. As a result, the melted foamed plastic is pressed in accordance with conditions such as roughness and unevenness of the surface of the object to be bonded. That is, the foamed plastic pressed by the above point pressure penetrates into irregularities on the surface. further,
When the irregularities are large, closed cells also exist in the infiltrated foamed plastic, and the closed cells expand to push the foamed plastic that has penetrated to some extent further to the back to permeate it. As a result, the foamed plastic wraps around and penetrates to the back side of bubbles, skeletons, particles, and the like on the surface of the object to be bonded, like the surface of the urethane foam 1 in FIG.

That is, the foamed plastic whose surface is melted penetrates deeply into the minute gaps on the surface of the object to be bonded, and the foamed plastic sheet and the object to be bonded are securely bonded.

When the pressure heating is stopped after the lapse of the set time, the foamed plastic cools and hardens in a short time, and is completely adhered.

The foamed plastic sheet 3 may be bonded as a coating for protecting the surface of the bonding object or the like, or may be bonded to bond the two bonding objects.

In the case of a coating, a foamed plastic sheet 3
Of these, the contact surface with the object to be bonded is securely bonded as described above. On the other hand, the opposite surface of the foamed plastic sheet 3 is heated and melted, so that closed cells on the surface are crushed to some extent. Thereby, the foamed plastic sheet 3
A layer of only plastic with no closed cells is formed on the surface. This layer has some strength and performs the function of a coating.

When two objects to be bonded are bonded,
The foamed plastic sheet 3 is sandwiched between two objects to be bonded, pressed and heated. Here, the force of pressing the two objects to be bonded from both sides supports the penetration of the molten foamed plastic on the surface deeply into the minute gaps on the surface of the object to be bonded by closed cells as in the case described above. What is needed is pressure. When the two objects to be bonded are soft, they are supported with a small pressure. When the object to be bonded is rigid, it is supported with relatively large pressure.

[Effects] As described above, the foamed plastic sheet 3 and the urethane foams 1, 5 and the cloth 2 to be bonded can be easily and reliably bonded in a short time without using an adhesive. it can.

[Modifications] (1) In the above embodiment, when two objects to be bonded are bonded together, the foamed plastic sheet 3 is simultaneously bonded to the two objects to be bonded. Good. Usually, in a factory or the like, two objects to be bonded are stuck together by sandwiching the foamed plastic sheet 3 between the two objects to be bonded and heating by pressing. The sheet 3 may be attached, and the other object to be adhered and the foamed plastic sheet 3 may be attached on site. For example, when applied to the soundproofing material of the road side wall, the soundproofing material and the foamed plastic sheet 3 are bonded in a factory or the like, and
It may be inserted into a bag-shaped skin material attached to the side wall of the road, and may be heated by pressure.

As described above, in some cases, it is more efficient to divide the bonding work into a factory or the like and the work site, so that the bonding procedure is appropriately adjusted.

(2) In each of the above embodiments, the urethane foam 1 and the nonwoven fabric 2 are described as examples of the bonding object, but other than these, the fabric, nonwoven fabric, felt,
Plastic foam, leather, cork, wood, synthetic leather,
It can be applied to thick and thin sheet members such as cotton and metal foil. In these cases, the same operation and effect as the above embodiment can be obtained.

(3) The method for bonding a foamed plastic sheet of the present invention can also be used for bonding a urethane pad and a cloth. For example, a foamed plastic sheet is preliminarily bonded to a urethane pad formed as a shoulder pad or a chest pad of the clothes, and the surface of the foamed plastic sheet is fitted with the cloth and heated by pressing with an iron. Thereby, the urethane pad can be easily and reliably attached to the clothing material.

(4) The foamed plastic sheet bonding method and foamed plastic sheet coating method, and the foamed plastic sheet bonded article and the foamed plastic sheet coated article described above can be used for heat insulating materials, building materials, cushioning materials, packing materials, and the like. . When used for these, the same operation and effect as the above embodiment can be obtained.

(5) In the above embodiment, the pressure bonding and the heating are performed at the atmospheric pressure. However, the pressure bonding and the heating may be performed in a reduced pressure space by a hot press machine having a decompression chamber. In this case, by reducing the pressure, the internal pressure of the closed cells becomes relatively higher than the external pressure, and the closed cells easily expand. Therefore, the foamed plastic sheet can be adhered to the cloth or the like at a low temperature. As a result, it is possible to reduce or prevent the damage of the object to be bonded, especially the cloth.

[0048]

As described above, according to the foamed plastic sheet bonding method and the foamed plastic sheet coating method, and the foamed plastic sheet bonded article and the foamed plastic sheet coated article according to the present invention, the foamed plastic sheet and the object to be bonded are formed. Thus, it is possible to easily and reliably adhere in a short time without using an adhesive.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a urethane foam 1 and a cloth 2 are bonded with a foamed plastic sheet 3 according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part showing a bonded portion between the foamed plastic sheet 3 and the urethane foam 1 of FIG.

FIG. 3 is an enlarged view of a main part showing an adhesive portion between a foamed plastic sheet 3 and a cloth 2 in FIG.

FIG. 4 is a cross-sectional view showing a state where urethane foam 5 and foamed plastic sheet 3 are bonded.

[Explanation of symbols]

1: urethane foam, 2: fabric, 3: foamed plastic sheet, 5: urethane foam.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hitoshi Yagi 591 Higashi Noda, Oyama, Tochigi Prefecture F-term (reference) 4F100 AK01A AK51C AT00B AT00C BA02 BA03 BA05 BA06 BA07 BA10B BA10C BA13 DG11B DG15B DJ01 DJ01C DJ02A EC03A EC032 EH012 EJ172 EJ42A EJ422 GB07 GB15 GB72 JA02A JL02 JL11 JL11A 4F211 AC03 AD05 AD17 AG01 TA01 TA13 TC02 TD11 TN02 TN48 TN54 TQ01

Claims (5)

[Claims] 1. A foamed plastic mixed with closed cells is sandwiched between two objects to be bonded and pressed and heated to soften the surface of the foamed plastic and expand the closed cells to bond the softened plastic. A method of bonding a foamed plastic sheet, wherein the foamed plastic sheet is bonded by penetrating into a minute gap on a surface of an object. 2. A foamed plastic mixed with closed cells is pressed against the surface of the object to be coated and heated to soften the foamed plastic surface and expand closed cells.
A method for coating a foamed plastic sheet, wherein the softened plastic is penetrated into minute gaps on the surface of a coating target object and adhered to form a film. 3. A foamed plastic in which closed cells are mixed is preliminarily pressed against the surface of one of the objects to be bonded and heated to soften the surface of the foamed plastic and expand the closed cells to bond the softened plastic to the object to be bonded. A method of bonding a foamed plastic sheet, wherein the foamed plastic sheet is adhered by penetrating into a minute gap on the surface of the object, bonding another object to be bonded on the foamed plastic at the site, pressing and heating, and adhering to each other. 4. A foamed plastic mixed with closed cells is sandwiched between two objects to be bonded and pressed and heated to soften the foamed plastic surface and expand the closed cells to bond the softened plastic. A foamed plastic sheet-adhered article characterized in that it permeates and adheres to minute gaps on the surface of an object. 5. A foamed plastic mixed with closed cells is pressed against the surface of the object to be coated and heated to soften the foamed plastic surface and expand closed cells.
A foamed plastic sheet coated article, characterized in that softened plastic penetrates into minute gaps on the surface of a coating target and is adhered to form a film.