Static structures (e.g. – buildings) – With exposed configuration having acoustical function – Absorbing material behind foraminous facing sheet
Patent
1996-11-21
1998-01-20
Friedman, Carl D.
Static structures (e.g., buildings)
With exposed configuration having acoustical function
Absorbing material behind foraminous facing sheet
527941, 5279211, 527921, 524062, 181284, 181293, E04B 182
Patent
active
057090530
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a panel for constituting sound insulating wall used for noise-control measures in locations such as road, railroad, and the industrial facilities, and in more detail relates to a panel for constituting sound insulating wall utilizing a plastic coated with a magnetic material such as a magnetic tape or magnetic sheet, particularly waste material of the same.
DESCRIPTION OF THE PRIOR ART
The amount of production of plastic coated with a magnetic material such as magnetic tape and magnetic sheet has been increasing year by year. The disposal of that type of refuse has in particular become a problem. At the present time, magnetic tape has been dealt with by burying or burning on the scale of several hundred tons per month all over the country.
In the future, if the recovering system of used magnetic tape from general user is built up, the disposal of that type of the huge amount of refuse will become a problem.
On the other hand, as sound absorbing members, there have been known fibrous sound absorbing members such as glass wool and rock wool, metal type sound absorbing members such as aluminum and ceramic type porous sound absorbing members. Also, concrete materials have a sound absorbing performance. Further, also sheet materials such as plywood, gypsum plaster board, and particle board are used as sound absorbing members. Also, for the purpose of improving the sound absorption property of specific frequencies, perforated sheets etc. have been used.
As a panel for constituting sound insulation wall, fibrous sound absorbing members such as glass wool and rock wool attached between front plate and rear plate have been used.
However, the fibrous sound absorbing members such as the aforesaid glass wool and rock wool have a moisture absorption property and water absorption property. As the amount of absorbed moisture and amount of absorbed water increase, the sound absorption performance is reduced. Also, in general, sound absorbing members of ceramics and concretes are heavy and expensive, and therefore are not preferable to be used as a panel for constituting sound insulating wall. Also, simple sheet materials and perforated sheets generally have a low sound absorption performance, and cannot be used as a panel for constituting sound insulating wall.
SUMMARY OF THE INVENTION
The present inventor has been engaged in repeated studies in various areas regarding a panel for constituting sound insulating wall which is excellent in sound absorption performance, excellent also in moisture resistance and waterproofness, and cheap. Consequently he has discovered that a panel for constituting sound insulating wall obtained by shredding or pulverizing (collectively referred to in this specification as "shredding") waste plastic coated with a magnetic material such as magnetic tape or magnetic sheet coated with, for example, a magnetic powder; and shaping the shreds into a sheet or a block in the panel just as it is, or accommodating shreds with appropriately filling them in a bag, exhibits a good sound absorption performance. The excellent sound absorption is due to the appropriate void proportion and the elasticity of the magnetic tape film, and to its large local surface density. This product has also excellent characteristics in its moisture resistance and waterproofness due to a fact that it is a plastic. Thus the present invention has been perfected.
The present invention has been made in consideration with such an actual circumstance and has as an object thereof to obtain a panel for constituting sound insulating wall, which has a good sound absorption characteristic and in addition is excellent in moisture resistance and waterproofness, and also a light weight and cheap by utilizing a plastic coated with a magnetic material, such as magnetic tape or magnetic sheet, particularly utilizing the waste thereof.
To achieve the above-mentioned object, a panel for constituting sound insulating wall related to this invention comprises a front plate, a rear plate, and a so
REFERENCES:
patent: 3540116 (1970-11-01), Drahos et al.
patent: 3668176 (1972-06-01), Childress
patent: 3948347 (1976-04-01), Rutledge
patent: 4241806 (1980-12-01), Meteger
patent: 4706422 (1987-11-01), Ashton
patent: 5285609 (1994-02-01), Goad
patent: 5384999 (1995-01-01), Roche et al.
Friedman Carl D.
Horton-Richardson Yvonne
Zeon Kasei Co., Ltd
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