Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1996-09-11
2000-07-18
Cole, Elizabeth M.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
4283211, 4283215, 428900, B32B 526
Patent
active
06090478&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a plastic sheet material for sound absorption and insulation and electric wave absorption containing magnetic fluid-enclosing capsules, a sound absorbing and insulating plastic panel useful particularly for sound absorption and insulation in building materials and a plastic panel for electric wave absorption useful for shielding electromagnetic waves in mobile communication or the like.
BACKGROUND ART
Up to now, plastics panels having a sound-proofing property are in wide use, because of their light weight, as external wall materials, interior lining materials and roofing materials for buildings, as sound-proof walls for high ways and railways, and for other like uses. Such plastic panels are commonly used by incorporating into the inside thereof, to be imparted sound-proofing property, porous materials, such as formed plastics and glass wool, or finely partitioned hollow cells.
However, such plastic panels having porous, hollow cell structures are all poor in sound absorbing and insulating effect in the low- and medium-pitched sound range (100-200 Hz), and cannot give a satisfactory sound absorbing and insulating effect for a wide range of pitches of sound.
Further, since they have predominantly continuous pores, they are poor in resistance to a local load and unsatisfactory in mechanical strength.
An example of panels for sound-proofing in the low- and medium-pitched sound range is a sound-proof panel obtained by filling sand particles into the inner space of a sandwich type panel disclosed in JP-A-53-72313.
In this method, however, it is difficult to fill sand particles into the inner space of the panel closely without leaving gaps in order to attain a sufficient sound-proofing characteristic. Moreover, since sand is weighty, it is difficult to obtain panels of light weight.
JP-A-5-279569 discloses a vibration-proofing material comprising a silicone gel having a specific pressure transmission characteristic and hollow microspheres formed of an inorganic material, such as aluminosilicate, incorporated thereinto. However, the material aims at vibration proofing and damping in the range of 100 Hz or less, and nothing is taught of the sound absorption and insulation property of the material in the disclosure.
The object of the present invention is, overcoming the above-mentioned difficulties, to provide a light-weight plastic sheet material having an excellent sound absorbing and insulating effect even in the low- and medium-pitched sound range and a sound absorbing and insulating plastic panel using the sheet material for use in buildings and sound-proof walls.
DISCLOSURE OF THE INVENTION
Thus, the present invention relates to a sound absorbing and insulating plastic sheet material comprising a plastic sheet-formed substance and magnetic fluid-enclosing capsules contained in the sheet-formed substance.
By incorporating the magnetic fluid-enclosing capsules into the inside of the plastic sheet-formed substance, the sound energy transmitted from the outside to the shell of the capsule is converted into vibration energy by the magnetic substance fine particles in the magnetic fluid included in the capsule, and thus an excellent sound absorbing and insulating effect is obtained. Moreover, since the magnetic substance fine particles have a large mass as compared with the capsule shell, the above-mentioned effect is still more enhanced, and a sound absorbing and insulating plastic sheet material, which has an excellent sound absorbing and insulating effect even in the low- and medium-pitched sound range, can be provided.
Furthermore, it is advantageous that the sound absorbing and insulating plastic panel according to the present invention which comprises the above-mentioned sound absorbing and insulating plastic sheet material and a fiber-reinforced plastic sheet bound to at least one side of the sheet material is excellent in mechanical strength and rigidity, and the sound absorbing and insulating plastic panel according to the present invention which com
REFERENCES:
patent: 3460248 (1969-08-01), Tate
patent: 4232084 (1980-11-01), Tate
patent: 5343184 (1994-08-01), Matsui et al.
Nishizaki Akihiko
Shibamoto Toshihiko
Tanaka Koji
Cole Elizabeth M.
Matsumoto Yushi-Seiyaku Co. Ltd.
Nitto Boseki Co. Ltd.
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