JPH11229602A - Floor material and damping sheet therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the insulating effect against floor impact sound by mixing together a predetermined wt.% of crushed powder of cast iron turning a predetermined wt.% of process oil and asphalt for the most part of the remaining portion and then forming the mixture to a sheet shape. SOLUTION: 70 to 95 wt.% of crushed powder of cast iron turning 0.5 to 2 wt.% of process oil, and asphalt added with an additive are mixed together. Next, a damping sheet of a predetermined thickness is formed. In succession, this is clamped between a floor board of a predetermined thickness and a particle board, and the damping sheet, floor board and particle board are nailed to form a floor material. Then, vibration energy passing through the inside of this damping sheet is converted into heat energy by the internal friction of asphalt, internal friction by the crushed powder of cast iron turning friction by the asphalt and crushed powder and the internal friction by process oil and the energy is attenuated. In this way, good floor impact sound insulating characteristics can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping sheet for floor materials and a floor material having an excellent effect of blocking floor impact noise.

[0002]

2. Description of the Related Art Conventionally, a glass wool mat made of glass fiber having a density of 8 to 120 kg / cm ³ and a thickness of 10 to 150 mm has been used as a vibration damping sheet for flooring. The floor material is formed by wearing.

[0003]

However, when a floor impact is applied to a floor material in which the conventional vibration damping sheet for floor material and the floor plate are layered, the vibration damping sheet for floor material in the above-mentioned conventional vibration damping sheet for floor material is used. Is not sufficiently absorbed, and a desired floor impact sound blocking effect cannot be achieved. Therefore, the present invention
An object of the present invention is to provide a floor material vibration-damping sheet and a floor material that are excellent in a floor impact sound blocking effect.

[0004]

According to a first aspect of the present invention, there is provided a vibration-damping sheet for flooring, comprising 70 to 95% by weight of a cast iron dulled powder obtained by pulverizing cast iron dulled powder and 0.5 to 2% by weight of process oil. It is characterized in that it is mixed with asphalt, which occupies most of the remainder, to form a sheet. The flooring according to claim 2 is
A floor material damping sheet according to claim 1 and a floor plate are overlaid.

[0005] In the vibration damping sheet for floor material according to the first aspect, the energy of the vibration that is going to pass through the inside of the vibration damping sheet is the internal friction of asphalt, the internal friction of the cast iron dull powder, the asphalt and the cast iron dull powder. It is converted to heat energy and attenuated by friction with the product and internal friction of the process oil. In the floor material according to the second aspect, the vibration of the floor plate is transmitted to the floor material vibration damping sheet and is attenuated by the floor material vibration damping sheet.

The reason why the cast iron crushed powder is used in an amount of 70 to 95% by weight is that if it is less than 70% by weight, the effect of the floor material damping sheet to absorb the floor impact noise is reduced.
If the content is more than 95% by weight, the bulk specific gravity of the flooring damping sheet becomes large, and the flexibility is lost. The reason why the amount of the process oil is set to 0.5 to 2% by weight is that if the amount is less than 0.5% by weight, the flexibility is lowered, and if it is more than 2% by weight, the shape retention is reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The particle size of a pulverized cast iron
Desirably, the mesh size is 0 mesh or less. Most of the remaining part of the vibration-damping sheet for flooring contains asphalt and unavoidable impurities, and may contain a small amount of additives in addition to these. The thickness of the damping sheet for flooring is 2
It is desirable to set it to 12 mm, and it is especially desirable to set it to 3-6 mm. The method of laminating the floor material damping sheet and the floorboard is not particularly limited, and may be in close contact with each other using, for example, an adhesive, a nail, a bolt, or the like.

[0008]

Embodiments of the present invention will be described below. 90% by weight of crushed cast iron Dalai powder with a particle size of 30 mesh or less
And 1% by weight of process oil and 9% by weight of asphalt to which an additive (for example, calcium carbonate or paper combustion ash) is added to form a 6 mm-thick damping sheet. A 12 mm thick floorboard and a 20 mm thick
Of the present invention, and the vibration-damping sheet, the floor plate and the particle board were nailed to form an example floor material. Table 1 shows the results obtained by laying the floor material of the example on concrete having a thickness of 150 mm and measuring the cutoff characteristics of heavy floor impact sound according to JIS 1418 (method of measuring floor impact sound level at a building site).

[0009]

[Table 1]

For comparison, a glass wool mat (density 96 kg / cm ³ , thickness 50 mm) was used instead of the vibration damping sheet.
Was sandwiched between a floor plate having a thickness of 12 mm and a particle board having a thickness of 20 mm, and a comparative floor material was formed by nailing the glass wool mat, the floor plate, and the particle board. Table 1 shows the results of laying on a 150 mm-thick concrete and measuring heavy floor impact sound insulation properties according to JIS 1418 (method of measuring floor impact sound level at building site).

As is clear from Table 1, the floor material of the example has a lower floor impact sound level in all frequency ranges and a greater floor impact sound blocking effect than the floor material of the comparative example.

[0012]

According to the vibration damping sheet for floor material according to the first aspect of the present invention, the cast iron dull powder ground product 70 obtained by pulverizing cast iron dull powder is used.
To 95% by weight, 0.5 to 2% by weight of process oil, and asphalt occupying most of the remainder, and formed into a sheet. Is converted to heat energy by the oil and process oil and asphalt to suppress vibration,
Good floor impact sound insulation is obtained. According to the flooring material of the second aspect, the vibration damping sheet for the flooring material according to the first aspect and the floorboard are overlaid, so that the vibration of the floorboard at the time of floor impact is favorably attenuated, and the room is quiet. can do.

Claims (2)

[Claims] 1. A sheet made by mixing 70 to 95% by weight of a crushed cast iron dulled powder obtained by pulverizing cast iron dulled powder, 0.5 to 2% by weight of process oil and asphalt occupying most of the remainder. A vibration damping sheet for flooring, characterized by the following. 2. A flooring material wherein the flooring damping sheet according to claim 1 and a floorboard are laminated.