JPH0553910B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a base material for reducing as much as possible the sound generated by impact on lightweight floors.

[Prior art]

Conventionally, foam sheets such as foamed polyethylene, foamed polyurethane, and foamed rubber have been used as base materials for lightweight floors to reduce the sound generated by impact.

[Problem that the invention seeks to solve]

However, when these foam sheets alone are thick enough to prevent impact noise, they not only cause large local dents but also give people a shaking sensation.
There were aspects that harmed livability.

[Means for Solving the Problems] Therefore, as a result of extensive research, the inventors of the present invention have created a structure in which a support layer 2 is provided on an elastic layer 1 made of palm wood using rubber as a binder, and the surface hardness (Shor D) is 20-50,
Soft or foamed synthetic resin sheet 3 with a thickness of 0.5 to 3 mm
By using a base material made of sequentially laminated layers, we succeeded in solving all the problems of the conventional method at once.

The elastic layer is made of palm wood usually using rubber latex, and has a thickness of about 4 to 12 mm and a weight of about 600 to 1500.
Use one finished to g/m ² .

In particular, preferred results can be obtained by using palm lock, which is commercially available as a cushion material made by crimping and hardening the fibers of combs and spraying them with an elastic adhesive, and impregnating them with rubber latex to strengthen their elasticity. By combining the palm wood with rubber as a binder and the other two layers, it provides just the right amount of elasticity, absorbs shock, and provides a stable livability.

The support layer is made of plywood, hardboard, fiberboard (especially medium density fiberboard (d = 0.5 to 0.8))
Fibreboard is preferable], inorganic plates, metal plates, etc. can be used, and those having a thickness of about 2.0 to 5.5 mm are usually used.

As a soft or foamed synthetic resin sheet, one with a surface hardness (Shore D hardness) of 20 to 50, especially 30 to 40, and a thickness of 0.5 to 3 mm, especially 1.0 to 2.0, is used, but even if these are a single layer, , it may have multiple layers, and the back side may be lined with a fiber layer.
In any case, it is necessary to select a sheet with a value of 20 to 50 when the surface hardness (Shorer D hardness) of the entire sheet is measured. If this is too small, it may cause local dents or deteriorate livability.
Moreover, if it is too large, it will not function as a sound generation prevention layer. Regarding the thickness, if the thickness is less than 0.5 mm, the sound insulation or sound absorption effect to reduce the sound generated by impact will be insufficient, while if it is 3 mm or more, the sound insulation or sound absorption effect will be satisfactory, but the thickness of the entire floor will be insufficient. Not only does this increase the walking sensation, but it also causes problems such as fixtures and the like becoming more likely to sink or tilt.

Surface finishing materials to be applied on the base material of the present invention include synthetic resin tiles such as polyvinyl chloride;
Lightweight floor finishing materials such as cushion floors, linoleum sheets, synthetic resin sheets such as polyvinyl chloride, cork, and wood boards.

〔Example〕

A palm material 1 with a thickness of 5 mm obtained by molding palm fiber into a plate shape using natural rubber latex so that the ratio of palm fiber and rubber is 6:4 is formed using a rubber-based adhesive to create a thickness of 5 mm. A base material was obtained by laminating a 3 mm plywood board 2 and a fiber-reinforced soft polyvinyl chloride sheet 3 with a surface hardness of 40 and a thickness of 1.5 mm on top of the plywood board 2 using a urethane adhesive.

This base material was constructed on a 150 mm thick concrete slab floor base 4, and a 3.5 mm thick natural wood decorative plywood board 5 was used to finish the floor.

The floor impact sound level of this floor was measured according to JIS-A-1418, and an excellent result of L-55 was achieved.

〔Effect of the invention〕

By laminating three specific layers, the base material of the present invention has the following properties:
Despite its relatively thin structure, it achieved a soundproofing effect of an astonishing level of L-55, and was also successful in providing excellent livability with no local dents or rocking sensations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the layer structure of the base material of the present invention, and FIG. 2 is a sectional view showing an example of the case where the base material of the present invention is applied. 1...Elastic layer, 2...Support layer, 3...Sound prevention layer, 4...Floor base, 5...Natural wood decorative plywood.

Claims (1)

[Claims] 1 Elastic layer made of palm wood with rubber as a binder, support layer and surface hardness (Shorer D hardness) 20
~50, a base material for impact improvement characterized by sequentially laminating soft or foamed synthetic resin sheets having a thickness of 0.5 to 3 mm.