Double-walled structure and method and arrangement for producing

Details Double-walled structure and method and arrangement for producing Double-walled structure and method and arrangement for producing

1997-01-27

1998-09-01

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181252, E04F 1702

Patent

active

058013423

ABSTRACT:
In a method of producing a double-walled structure, such as a silencer for use in a ventilation duct system, use is made of an arrangement having a forming head for forming helically-wound lock-seam tubing. In the forming head, a perforated metal strip is helically would together with an air-permeable cloth strip such that the tubing fed out of the forming head has an outer cover of said cloth. The tube assembly consisting of the perforated tube and the cloth cover is provided with an outer tubular layer of insulating material and then inserted in a casing which makes the silencer complete.

REFERENCES:
patent: 1643008 (1927-09-01), Fentress
patent: 2937436 (1960-05-01), Butler et al.
patent: 3487537 (1970-01-01), Lombardi
patent: 3903928 (1975-09-01), Sykes et al.
patent: 3981378 (1976-09-01), Potter
patent: 5162622 (1992-11-01), Malmsten
patent: 5670756 (1997-09-01), Ohtaka et al.
Brochure, "LindabSilencer," Lindab Ltd., 1988.

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