Method for producing a double-walled structure

Details Method for producing a double-walled structure Method for producing a double-walled structure

1997-10-23

1999-06-15

Cuda, I

Metal working

Method of mechanical manufacture

Gas and water specific plumbing component making

29890053, 2989008, B23P 1526

Patent

active

059114576

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 wound 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.

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