JPH068373A - Rubber veneer laminated sheet - Google Patents

Abstract

PURPOSE:To expand the use of a rubber veneer laminated sheet to a large extent by improving 'brittleness' being the defect of the rubber veneer laminated sheet by together using specific paper and/or a specific nonwoven fabric and imparting toughness to the laminated sheet. CONSTITUTION:A rubber veneer, laminated sheet is constituted by using vulcanized paper or parchment paper and/or a nonwoven fabric with a thickness of 0.1-3mm together with rubber veneer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber veneer laminate, and more particularly to a rubber veneer laminate which is widely used for building interior materials, furniture, civil engineering materials, distribution pallets and packing materials.

[0002]

2. Description of the Related Art Conventionally, single plate laminated plates (plywood, LVL, etc.)
A large amount of South Sea timber, such as rawan, meranti, and kapole, has been used as the material for these trees, but these trees have become depleted and cause global warming. Moreover, the use of rubber trees, which had been disposed of as waste wood, is becoming popular. However, the conventional rubber veneer laminate is inferior in strength performance, especially toughness, to the general veneered veneer laminate.
That is, it is brittle. It is conceivable that this is due to the fact that the oil and fat content is low because the tree from which the rubber sap has been collected is used. Therefore, the use of this plywood is also limited.

[0003]

SUMMARY OF THE INVENTION In order to expand the utilization of earth-friendly rubber trees, the present inventor has greatly improved the strength performance, particularly "brittleness", which was a drawback of conventional rubber veneer laminates. The present invention has been completed with the object of providing an improved rubber single plate laminate. That is, the present invention is
Vulcanized paper, parchment paper and / or rubber veneer
Alternatively, it is intended to provide a rubber veneer laminate having improved strength performance by using a non-woven fabric together.

[0004]

SUMMARY OF THE INVENTION The present invention is a laminated rubber veneer characterized by using a specific paper, that is, vulcanized paper, parchmented paper and / or non-woven fabric, in combination with the rubber veneer. The rubber veneer used in the present invention is made of a rubber tree obtained by collecting the rubber sap as a raw material, which is subjected to antiseptic and antifungal treatment and then 0.2
Any single plate that has been uniformly peeled off to a thickness of about 3 mm may be used. The specific paper and / or non-woven fabric is vulcanized paper, parchment paper and / or non-woven fabric. The thickness is 0.
Those of 1 to 3 mm, preferably 0.15 to 0.5 mm are suitable for use. If it is thinner than 0.1 mm, the desired strength cannot be obtained. If it is thicker than 3 mm, the effect of improving the strength hardly increases, which is irrational. The vulcanized paper is a paper which is hard, excellent in water resistance and toughness, which is obtained by immersing a fiber base paper in a concentrated zinc chloride aqueous solution to gelatinize the surface, and then thoroughly washing with water and drying. What is parchment paper?
Also called sulfuric acid paper, it is a paper made from chemical pulp that is treated with concentrated sulfuric acid, then washed completely with water and dried, and has excellent water resistance and toughness. Nonwoven fabric is a synthetic fiber made into a web and bonded with an adhesive, water resistance,
Excellent strength.

Although any number of vulcanized papers, parchment papers and / or non-woven fabrics can be used in any number of layers, the effect can be obtained, but it is effective to use them in the layer next to the front and back plates of the rubber single-layer laminate. . That is, it is preferable to use one sheet each for the second layer from the surface of the laminated rubber single plate, that is, two sheets in total.

As the adhesive, a general plywood adhesive, that is, a urea resin-based adhesive, a melamine resin-based adhesive, a phenolic resin-based adhesive, and a cocondensation resin thereof can be used. For example, a paste solution in which 100 parts by weight of urea resin for plywood, 20 parts by weight of wheat flour, and 20 parts by weight of water are well kneaded, and 1 part by weight of ammonium chloride powder is added and mixed as a curing agent can be used. Depending on the application, a vinyl acetate resin emulsion adhesive can also be used. In any case, it is not particularly limited. The adhesion may be performed by a known method, and examples thereof include hot pressing, cold pressing, and roll pressing.

[0007]

The properties of the laminated rubber veneer laminate according to the present invention are significantly improved in strength performance, particularly toughness and / or brittleness at the same thickness, and are comparable to general beech plywood as well as ordinary Nanyo plywood. The performance to do can be obtained.

[0008]

EXAMPLES The present invention will now be described in more detail by way of examples, which should not be construed as limiting the invention thereto. In the examples, parts and% are parts by weight and% by weight. Example 1 Three rubber single plates (water content: 8%) having a thickness of 1.50 mm, a width of 30 cm, and a length of 30 cm are combined so that the wood grain is orthogonal. Vulcanized paper (trade name: fiber board, manufactured by Toyo Fiber Co., Ltd.) having a thickness of 0.2 mm and the same size as the rubber veneer is inserted between the rubber veneers. A total of 5 ply plywood was obtained, with a structural thickness of 4.90 mm. Melamine urea resin (trade name: S-resin SA-3 as an adhesive
0, Matsuei Chemical Industry Co., Ltd. 100 parts, wheat flour (trade name: Akabotani, Nippon Flour Milling Co., Ltd.) 15 parts, water 5 parts, ammonium chloride powder 0.5 parts Was prepared. The coating was carried out with a brush at a rate of 100 g / m ² on each surface of the rubber veneer to be adhered. After this was clamped for 30 minutes at a pressure of 10 kg / cm ² by using a cold press, a hot press, pressure 10 kg / cm ^2, at a temperature 120 ° C. 4
Partially clamped to obtain a rubber plywood. The thickness, air-dry specific gravity, bending fracture load, bending strength, bending Young's modulus, maximum deflection, and JAS2 immersion peel test of this plywood were measured, and the results are shown in Table 1.

[Table 1]

The test method was as follows. The thickness was measured at four points with a micrometer, and the average value was shown. The air-dry specific gravity was calculated from the volume of the test body and its weight. Bending load is 4 width without changing the thickness of the specimen.
The span length was 24 times the actual thickness. The bending direction was 0 degree. The measurement was performed using an autograph, the load was 100 kg, the load speed was 10 mm / min, and the maximum load at the time of breaking was defined as the bending breaking load. The bending strength was calculated from the maximum breaking load by a standard method. The bending Young's modulus was calculated from the chart paper whose bending strength was measured by a conventional method. Similarly, the maximum deflection was calculated from the chart paper whose bending strength was measured in the same manner. The JAS type 2 immersion peel test is conducted by immersing a test piece of size 75 mm x 75 mm in warm water at 70 ° C for 2 hours and then drying it in a dryer at 60 ° C for 3 hours. If 10% or less of the entire length of the adhesive layer, the degree of adhesion is judged to be acceptable.

EXAMPLE 2 Three rubber veneers each having a thickness of 1.45 mm and a width and a length of 30 cm are combined so that the wood grain is orthogonal, and a parchment having a thickness of 0.17 mm and the same size as the rubber veneer. Paper (trade name: DEEP W, basis weight 50.4 g / m ² , manufactured by Honshu Paper Co., Ltd.) is inserted between each rubber veneer. It had a total of 5 plies and had a structural thickness of 4.69 mm. The adhesive and the bonding operation were performed in the same manner as in Example 1, and the performance test was also performed in Example 1.
It carried out similarly to. The results are shown in Table 1.

Example 3 Three rubber veneers each having a thickness of 1.47 mm and a width and a length of 30 cm were combined so that the wood grain was orthogonal to each other, and a 0.19 mm-thick non-woven fabric of the same size as the rubber veneer. (Product name:
H-8010, basis weight 100 g / m ² , made of polyester,
Insert Japan Vilene Co., Ltd. between each rubber veneer. The total was 5 plies, and the structural thickness was 4.79 mm. The adhesive and the bonding operation were performed in the same manner as in Example 1, and the performance test was performed in the same manner as in Example 1. The results are shown in Table 1.

COMPARATIVE EXAMPLE 1 Three rubber veneers each having a thickness of 1.57 mm and a width and a length of 30 cm are combined so that the wood grains are orthogonal to each other. Total 3
It was a ply and had a structural thickness of 4.71 mm. The adhesive and the bonding operation were performed in the same manner as in Example 1, and the performance test was performed in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 2 Three rubber veneers each having a thickness of 1.55 mm and a width and a length of 30 cm were combined so that the wood grains were orthogonal to each other, and a liner having a thickness of 0.2 mm and the same size as the rubber veneer. Paper (Product name: K liner, basis weight 220 g / m ² , Honshu Paper Co., Ltd.)
Product) is inserted between each rubber veneer. The total was 5 plies, and the thickness was 5.05 mm. The adhesive and the bonding operation were performed in the same manner as in Example 1, and the performance test was performed in the same manner as in Example 1. The results are shown in Table 1.

COMPARATIVE EXAMPLE 3 Three domestic beech veneers each having a thickness of 1.52 mm and a width and a length of 30 cm are combined so that the wood grain is orthogonal.
The total thickness was 3 plies, and the thickness was 4.56 mm. The adhesive and the bonding operation were performed in the same manner as in Example 1, and the performance test was performed in the same manner as in Example 1. The results are shown in Table 1.

[0015]

The advantage of the present invention is that, as is clear from Table 1, by inserting a specific paper, that is, vulcanized paper, parchment paper and / or non-woven fabric into a rubber veneer,
The toughness or “brittleness” that was a drawback of laminated rubber veneer
Can be significantly improved, and a laminated plate that is as strong as a beech veneer laminated plate can be obtained.

Claims (1)

[Claims] 1. A laminated rubber veneer sheet comprising a combination of vulcanized paper, parchment paper and / or non-woven fabric having a thickness of 0.1 to 3 mm.