SOUND ABSORBER AND ITS INSTALLATION METHOD

PURPOSE:To provide a sound absorber which has an excellent sound absorbing effect, is applicable with small space volume particularly for preventing noises of low frequencies and is excellent in cost effectiveness by forming the sound absorber consisting of a porous molding of resin foamed particles...

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Bibliographische Detailangaben
Hauptverfasser:	FUJIE AKIRA, TAKAISHI SHOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING BLASTING BUILDING CEILINGS FIXED CONSTRUCTIONS FLOORS GENERAL BUILDING CONSTRUCTIONS HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS INSULATION OR OTHER PROTECTION OF BUILDINGS LIGHTING MECHANICAL ENGINEERING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PERFORMING OPERATIONS PHYSICS RANGES ROOFS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SOUND-PRODUCING DEVICES TRANSPORTING VENTILATING WALLS, e.g. PARTITIONS WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a sound absorber which has an excellent sound absorbing effect, is applicable with small space volume particularly for preventing noises of low frequencies and is excellent in cost effectiveness by forming the sound absorber consisting of a porous molding of resin foamed particles having a peak frequency of a specific range. CONSTITUTION:This sound absorber is the porous molding of the resin foamed particles 1 having the peak frequency of sound absorptivity of >=30% in a region of 100 to 3000Hz. The sound absorption characteristic of low-frequency tones degrades and such sound absorber is unsuitable if the peak frequency exceeds 3000Hz. The sound absorber having the peak frequency below 100Hz is hardly obtainable. The porous molding of the resin foamed particles 1 is integrally molded with many pieces of the resin foamed particles 1 by surface-to-surface joining in part of the adjacent particle surfaces and gap parts 2 are formed among these particles. These gap parts 2 do not have a fixed shape in the thickness direction of the molding and exhibit an attenuation effect by multiple reflections and interference at the time the incident sound waves pass the sound ways. Then, the sound absorbing performance of the low-frequency region is enhanced, by which the space size necessary for soundproof installation including rear air layers is reduced.