JP2007098728A - Multipurpose foam and its method of use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to obtain a foam with a good foaming condition and to enhance the degree of freedom in the case of intending to make the foam a desired shape by foaming and to set the foam after foaming in a desired position. <P>SOLUTION: The foam 1 has a mixture 2 of at least one material of a rubber material and a resin material and a foaming agent, a cover body 3 airtightly covering the whole of the mixture 2 and expanded while resisting to the expansion of the mixture when the mixture 2 is expanded, and a securing means 5 capable of securing the cover body 3 covering the mixture 2 to the desired position of objective matter 4. The objective matter 4 is a pair of metal sheet materials 15, 16 constituting a part of the vehicle body 13 and facing each other forming a space 14. The foam 1 is inserted in the space 14 and secured to the desired positions of the mutual facing faces of both the metal sheet materials 15, 16 by the securing member 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is used for vibration control of parts in automobiles, industrial machines, etc., for filling spaces in cargo boxes such as when transporting luggage, or for heat insulation and sound insulation of building materials for walls, floors, joinery, etc. Multipurpose foam and a method of using the same.

  Conventionally, there is a foam described in Patent Document 1 below. According to this publication, the foam is installed in a hollow portion in the body of an automobile, and the body is damped by the foam.

  When installing the foam in the cavity, first, a granular material is spread on the bottom so as to close a gap or a hole in the bottom of the cavity. Next, a liquid raw material of a foam is injected into the hollow portion and foamed, whereby the foam is installed.

Japanese Patent Laid-Open No. 9-267768

  By the way, the above conventional technique has the following problems.

  That is, first, the hollow portion of the vehicle body communicates with the outside of the vehicle body through gaps and holes in the bottom portion and gaps between the granular materials.

  For this reason, when the raw material of the said foam is made to foam, the gas with which the said cavity part is filled is discharge | released outside the vehicle body through each said clearance gap and hole. Therefore, since it is difficult to increase the pressure in the cavity, there is a possibility that a foam having a good foamed state cannot be obtained.

  Secondly, when the raw material of the foam is foamed, the raw material flows while expanding so as to match the inner surface shape of the cavity, thereby defining the shape of the foam.

  For this reason, it is extremely difficult to try to mold the foam into a desired shape regardless of the shape of the inner surface of the cavity. It is also extremely difficult to install the foam only on the upper part of the cavity, for example. Therefore, there is a problem that each degree of freedom is low when trying to mold the foam into a desired shape or when installing the foam at a desired position.

  The present invention has been made by paying attention to the above-described circumstances, and an object of the present invention is to obtain a foam having a good foamed state and to make the foam into a desired shape by foaming. Or improving the degree of freedom in the case where the foam after foaming is to be placed at a desired position.

  The invention of claim 1 covers at least one of a rubber material and a resin material, a mixture 2 of a foaming agent, and the mixture 2 in a totally airtight manner. When the mixture 2 is foamed, And a covering 3 that is stretched while resisting expansion.

  In addition to the invention of claim 1, the invention of claim 2 is provided with an attachment 5 that enables the covering 3 coated with the mixture 2 to be attached to a desired portion of the target object 4.

The invention of claim 3 is a method of using the foam 1 of claim 2,
The object 4 is a pair of sheet metal members 15 and 16 that constitute a part of the vehicle body 13 and face each other with a space 14 therebetween. The foam 1 is inserted into the space 14 and the both sheet metal members are inserted. The said covering 3 is attached to the desired site | part of the mutually opposing surface of 15 and 16 with the said attachment 5, the said mixture 2 is foamed by the heating in the coating process of the said vehicle body 13, and the foam 1 is made into the said both sheet metal. It is made to press-contact with each opposing surface of the materials 15 and 16, respectively.

  In this section, the reference numerals appended to the above terms are not to be construed as limiting the technical scope of the present invention to the section “Example” described later or the contents of the drawings.

  The effects of the present invention are as follows.

  According to the first aspect of the present invention, there is provided a mixture of at least one of a rubber material and a resin material and a foaming agent, and the mixture is entirely airtightly coated, and resists expansion when the mixture is foamed. While being stretched.

  For this reason, when the mixture is expanded by foaming, the covering body resists an increase in internal pressure accompanying the expansion of the mixture, and the internal pressure of the covering body rises. Foaming of the mixture is allowed to proceed. Therefore, it is possible to obtain a good foam such that the foamed state of the mixture becomes more uniform than the pressure around the mixture is low.

  Moreover, the shape of the foam after foaming can be made into a desired shape by predetermining the shape of the said mixture of foams and a covering. For this reason, the freedom degree in the case of trying to make the said foam into a desired shape by foaming improves.

  According to a second aspect of the present invention, there is provided an attachment that enables the covering body coated with the mixture to be attached to a desired portion of a target object.

  For this reason, if the said foam is attached and foamed to the desired site | part of a target object with the said fixture, the foam after the foaming can be installed in a desired position. That is, the degree of freedom in the case where the foam is to be installed at a desired portion of the object is improved.

The invention of claim 3 is a method of using the foam of claim 2,
The object is a pair of sheet metal members that constitute a part of the vehicle body and face each other with a space between them, and the foam is inserted into the space so that desired portions of the opposing surfaces of the both sheet metal materials are located. The above-mentioned covering is attached to the above-mentioned mounting tool, and the mixture is foamed by heating in the painting process of the vehicle body, and the foam is pressed against the opposing surfaces of the both sheet metal members.

  For this reason, both the sheet metal members are supported by the foam after the foaming, that is, the foam having a buffer function. Therefore, damping of each sheet metal member in the vehicle body is achieved by the foam.

  The multipurpose foam of the present invention and a method for using the same are to obtain a foam having a good foamed state, and to try to make the foam into a desired shape by foaming, or to place the foam after foaming in a desired position. The best mode for carrying out the present invention is as follows in order to realize the purpose of improving the degree of freedom in the case of installation.

  That is, the foam covers a mixture of at least one of a rubber material and a resin material and a foaming agent, and the mixture in an airtight manner, and resists expansion when the mixture is foamed. While being stretched.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a multipurpose foam before foaming. This foam 1 is coated with a mixture 2 of at least one of a rubber material and a resin material, a foaming agent, and a crosslinking agent, and the mixture 2 in an airtight manner. A covering 3 that is stretched while resisting expansion at the time of foaming, and a fixture 5 that can attach the covering 3 coated with the mixture 2 to a desired portion of the target object 4 are provided.

  Examples of the rubber material include SBR natural rubber and EPDM.

  Examples of the resin material include polystyrene (styrene resin), polyethylene, EVA resin, ABS resin, polyurethane, and vinyl chloride resin.

  The foaming agent is a gas such as carbon dioxide as a volatile foaming agent or a volatile liquid such as ethyl ether, and an inorganic compound such as ammonium carbonate or sodium bicarbonate as a decomposable foaming agent.

  Moreover, the said crosslinking agent is sulfur, a peroxide (organic peroxide), etc., when the said mixture 2 has rubber | gum, and a peroxide (organic peroxide) etc., when it has the said resin material. .

  The mixture 2 is a clay-like plastic material and can be easily molded into a desired shape. The mixture 2 may be a thermoplastic solid material and molded into a desired shape in the plastic state.

  The covering 3 is formed by winding a long resin film such as EVAL (registered trademark) around the mixture 2 having a desired volume and a desired shape. The resin film has a multi-layer structure integrally including inner and outer layers 8 and 9 and an intermediate layer 10 interposed between the inner and outer layers 8 and 9. The inner layer 8 is made of polyethylene, the outer layer 9 is made of polyester, and the intermediate layer 10 is made of polyvinyl alcohol. The covering 3 can be stretched not only by its internal pressure but also by heating.

  The covering 3 may be made of rubber and have elasticity. Moreover, the said covering 3 may be shape | molded previously by the bag shape, and the said mixture 2 may be liquefied in this case. Moreover, the said covering 3 may be made into a desired shape beforehand, or it may become a desired shape when it is extended, and you may make it the foam 1 after foaming become a desired shape.

  The object 4 is a door that is a part of the vehicle body 13 of the automobile. The object 4 includes a pair of sheet metal members 15 and 16 facing each other with a vertically long space 14 extending flat. The attachment 5 is a double-sided tape. The attachment 5 may be a hook-and-loop fastener, an adhesive, a hook, or the like.

  The foam 1 is inserted into the upper portion of the space 14 from the outside of the vehicle body 13 and attached to any desired portion of the opposing surfaces of the sheet metal members 15 and 16.

  And in the coating process of the said vehicle body 13, the mixture 2 of the said foam 1 is made to foam by the heating in the heating furnace which heat-hardens a paint and drains and dries. At this time, the mixture 2 expands, but the covering 3 resists the increase in internal pressure accompanying the expansion of the mixture 2, and the internal pressure of the covering 3 rises. Foaming of the mixture 2 is allowed to proceed. Therefore, it is possible to obtain a good foam 1 such that the foamed state of the mixture 2 becomes more uniform than the pressure around the mixture 2 is low.

  Moreover, the shape of the foam 1 after foaming can be made into a desired shape by predetermining the shapes of the mixture 2 and the covering 3 of the foam 1. For this reason, the freedom degree in the case of trying to make the said foam 1 into a desired shape by foaming improves.

  Further, as described above, the attachment 5 is provided that enables the covering 3 that covers the mixture 2 to be attached to a desired portion of the target object 4.

  For this reason, if the said foam 1 is attached to the desired site | part of the target object 4 with the said attachment tool 5 and it is made to foam, the foam 1 after the foaming can be installed in a desired position. That is, the degree of freedom in the case where the foam 1 is to be placed at a desired site of the object 4 is improved.

  Moreover, since the said covering 3 is also extended by the expansion | swelling accompanying foaming of the said mixture 2, the foam 1 expands entirely. And this foam 1 is each press-contacted to each opposing surface of the said sheet-metal materials 15 and 16 (two-dot chain line in FIG. 1).

  For this reason, both the sheet metal members 15 and 16 are supported by the foam 1 after foaming, that is, the foam 1 having a buffer function. Therefore, vibration suppression of the sheet metal members 15 and 16 in the vehicle body 13 is achieved by the foam 1.

  In addition, although the above is based on the example of illustration, when the mixture 2 expands by foaming, the said covering 3 may be fractured | ruptured finally or burst | ruptured, or may lose | disappear with heat. Further, the object 4 may be a pillar of the vehicle body 13 or a building material.

  Moreover, the said foam 1 may be heated and made to foam independently without attaching this to the target object 4, and this may be used for some filling. For example, the foam 1 after foaming may be filled in a space in a cargo box such as when transporting a load so as to reduce the impact force applied to the load.

It is a longitudinal cross-sectional view of a foam and the target object using this.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foam 2 Mixture 3 Cover 4 Object 5 Attachment 13 Car body 14 Space 15 Sheet metal material 16 Sheet metal material

Claims (3)

  A mixture of at least one of a rubber material and a resin material, and a foaming agent; and a covering that covers the mixture in a totally airtight manner and is stretched while resisting expansion during foaming of the mixture; A multi-purpose foam characterized by comprising.   The multipurpose foam according to claim 1, further comprising an attachment that allows the covering covering the mixture to be attached to a desired portion of a target object. A method of using the foam of claim 2, comprising:
The object is a pair of sheet metal members that constitute a part of the vehicle body and face each other with a space between them, and the foam is inserted into the space so that desired portions of the opposing surfaces of the both sheet metal materials are located. The covering body is attached to the attachment tool, and the mixture is foamed by heating in the painting process of the vehicle body, and the foam body is brought into pressure contact with the opposing surfaces of the both sheet metal members. To use multipurpose foam.

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