JPS59158852A - Sound absorbing panel for building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to sound-absorbing boards for construction, ceiling boards, camphor trees, floor base boards, and housings for audio equipment, which are made by using cement as a binder and wood wool as a binder. This can be applied to a commercial board.

[Background - Techniques]

Traditionally, class wool has been used as this type of sound absorbing board.

Rock wool, soft fiberboard, perforated board, wood wool cement board, etc. have been put to practical use, but all of them increase the sound absorption coefficient depending on the frequency, and are excellent in terms of absorption characteristics over all frequencies. It wasn't. For example, to explain the frequency and sound absorption coefficient in the graph shown above, the ratio ff10.02.
For class wool with a thickness of 25 mm, as shown by the curve 1, as the frequency increases, the suction cancer tends to increase, but the latter rate is small in the low frequency range, with a specific gravity of 0.5 and a thickness of 25 m.
As shown in the curve 2 for wooden wool cement 1-board, the latter ratio shows a higher value as the frequency increases, and also shows a tendency for the sound absorption coefficient to increase by 1q at higher frequencies, both of which are higher than in the turbostratic wavenumber region. Poor sound absorption properties in the low frequency range.

[Purpose of the invention]

The present invention is based on the above-mentioned facts and provides a sound absorbing board for construction which has good sound absorbing properties particularly from the low frequency region to the high frequency region Z.

[Disclosure of the invention]

This invention uses cement as a binder, and this cement C has a t-suffix, B, an m-shaped cut iron piece, and a 'Tochiyume M'Ll''f.
：” ”””□It is characterized by 1]. Go, a medicinal sound-absorbing board made of haiku wood 1. So.

be. ″″
□Hereinafter, the length direction of a piece of wood 1 cut in the fiber direction is 20 cm or more.

This wood wool and fibrous cut iron pieces are mixed well with cement, and the cement becomes a good paste, which allows wood wool and fibers to be cut.
II iron piece, and the force was evenly coated. It is then compression molded. The cement used is typical Portland cement. Appropriate blending ratios are 40 to 50% by weight of wood wool, 40 to 50% by weight of introduction, and about 10% by weight of fibrous cut iron pieces. .

It is presumed that the fibrous cut iron piece exhibits the vibration-proofing effect due to the fibrous square in the low frequency range, whereas the sound absorbing properties of wood wool are exhibited in the high frequency range7. Here, the length of the fibrous cut iron piece used is about the same as that of wood wool.

The sound absorption characteristics of the architectural sound absorption board according to the present invention shown in the figure are shown by a curved line, which shows a well-balanced sound absorption characteristic number that does not shift over the low to high frequency range. The architectural sound-absorbing board whose sound-absorbing properties were measured was composed of 45% by weight of ceramic mate, 1% by weight of fibrous cut iron pieces, and 45% by weight of wood wool. It has been adjusted.

As described above, this invention is characterized in that it has a remarkable effect on sound absorption properties, especially in the low frequency range, and that it was achieved for the first time by using a fibrous cut iron piece in combination.

Note that when a glass wool layer is attached to this architectural sound absorbing board, the sound absorbing properties of glass wool are added, and the sound absorbing properties in the high frequency range are improved. □4. Brief explanation of the drawing □The figure shows □Changes in sound absorption coefficient with respect to frequency of a conventional sound absorbing plate: Invention 12 Wirui
6 Sound absorption coefficient for frequency of Tsukichi sound absorption gate 6. Change, Revenge 5
77A6゜Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] (11. A sound absorbing board for construction using cement as a binder, and using this cement to bind wood wool and m@f-shaped cut iron pieces. A building sound absorbing board according to claim 1 J!A on which a class wool layer is formed. Wood wool or 40 to 50 layers;
%, cement or 40-501%.