JPH0453939Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of a composite cork material used for various building equipment materials and structural materials, including flooring materials, wall materials, etc.

[Prior Art] Conventional composite cork materials include a top layer of cork material,
It is a two-layer structure consisting of a lower layer of urethane chips (Utility Model Application No. 155125/1983). The composite cork material is
The product is characterized by the use of a lower layer of urethane chips to reduce costs by reducing the amount of cork used, while minimizing the loss of the properties of the cork material. That is, the lower layer of urethane chips has practical value in that it compensates for the reduced properties inherent in cork material and also improves elasticity and sound insulation, which were still insufficient in cork material itself.

[Problem that the invention aims to solve] However, with this type of composite cork material,
We discovered that it has the disadvantage of expanding and contracting in the plane direction when it is exposed to humidity in the rainy season, dryness in winter, or an environment with a large drying cycle. Such expansion/contraction action is undesirable as it may cause a shift in the construction position. This is also a problem because it affects the lower layer of the urethane chip.

The purpose of this invention is to solve these drawbacks.

[Means for solving the problem] This invention provides a composite cork material having an upper layer of cork material and a lower layer of urethane chips.
It is characterized in that an anti-expansion layer is provided on the middle layer and/or the bottom layer.

The anti-expansion layer is preferably provided as an intermediate layer adjacent to the top layer of cork material from the standpoint of directly ensuring prevention of expansion and contraction. The bottom layer can be used as long as the material does not cause problems on the surface.

As the anti-expansion layer, any material can be used as long as it can prevent the expansion/contraction action of the upper layer of cork material. However, it is preferable to use a material that does not reduce the compensating effect, elasticity, and sound insulation properties of the urethane chip layer as much as possible, so after careful consideration, we found that glass cloth or glass nonwoven fabric is suitable for the middle layer, and glass cloth is suitable for the bottom layer. I found out that
In particular, it is preferable to arrange a glass cloth on the bottom layer because it ensures very good peel-up properties. Since cheesecloth also has a slight anti-stretching effect and has good peel-up properties, it can be used if a structure in which a glass cloth or the like is placed in the middle layer is adopted. When using cheesecloth, in order to ensure sufficient peel-up properties, it is particularly preferable to use a single yarn with a warp of 10 to 30 and a coarse yarn with a warp of 50 or less.

Therefore, the combination of the anti-stretch layers is as follows:
Glass cloth or glass non-woven fabric for the middle layer, glass cloth for the bottom layer, glass cloth or glass non-woven fabric for the middle layer, cheesecloth for the bottom layer, glass cloth or glass non-woven fabric for the middle layer, no bottom layer, no middle layer, glass bottom layer Cross can be used.

In order to increase the commercial value, it is desirable to apply a nonwoven fabric to the back side of this composite cork material.

The lower layer of urethane chips as used in the present invention is the same as that disclosed in Utility Model Application Publication No. 61-155125, and may be a single urethane chip made by tearing and crushing polyurethane foam, or an increased amount of fiber waste, wood chips, etc. This is a molded product made by blending a polyurethane binder into a mixture of materials and solidifying it into one piece. Therefore, depending on the properties of the anti-expansion agent used, the degree of compression during molding and the amount of filler added are adjusted to ensure the anti-expansion effect while also ensuring optimal effects on other properties such as elasticity. can be done.

There are no particular restrictions on the bonding of the layers, but a polyurethane-based binder is preferred.

[Function] According to this invention, an anti-expansion layer is placed on the middle layer and/or the bottom layer of the composite cork material, so even if it is exposed to humidity during the rainy season, dry time in winter, or an environment with a large drying cycle. Even in this case, expansion and contraction in the plane direction is prevented by the expansion and contraction prevention layer. Therefore, the construction position will not shift, and the compensating effect of the urethane chip layer on the cork material, as well as the improvements in elasticity and sound insulation properties, will be maintained at all times.

[Example] The drawing is a sectional view showing an example of a composite cork material according to this invention. In the figure, 1 is an upper layer of cork material, 2 is a lower layer of urethane chips, and an intermediate layer 3 and a bottom layer 4 are provided with anti-expansion layers. The anti-expansion layer of the middle layer 3 is made of a glass non-woven fabric which is particularly effective in preventing cork material from expanding and contracting, and the bottom layer 4 is provided with glass cloth to have both peel-up properties and anti-expansion functions.

Note that 5 is a urethane chip, 6 is an extender, and 7 is a nonwoven fabric.

Therefore, the upper surface layer 1 gives the appearance of cork material and exhibits the heat insulation, elasticity, sound insulation properties, etc. unique to cork material, and the urethane chip layer of the lower surface layer 2 makes it possible to reduce the amount of cork material used. It exhibits a compensating effect due to its characteristics. Furthermore, in this composite cork material, the expansion and contraction prevention layer of the intermediate layer 3 prevents the expansion and contraction of the top layer made of cork material, and the glass cloth of the bottom layer 4 supplements the excellent expansion and contraction prevention effect. It has peel-up properties.

[Effects of the invention] As described above, this invention has been able to provide a composite cork material that maintains the favorable effects of a cork material, reduces costs, and has an anti-expansion effect at the same time.

[Brief explanation of drawings]

The drawing is a sectional view showing one embodiment of the composite cork material according to the invention. 1...Top layer, 2...Bottom layer, 3...Middle layer,
4...Bottom layer.

Claims (1)

[Claims for Utility Model Registration] (1) A composite cork material having an upper layer of cork material and a lower layer of urethane chips, characterized in that an anti-expansion layer is arranged in the middle layer and/or the bottom layer. Cork wood. (2) The composite cork material according to claim 1, wherein the intermediate layer is glass cloth or glass nonwoven fabric, and the bottom layer is glass cloth or cheesecloth.