Patent ID: 6179009
Filing Date: 2001-01-30
Classification: B29C,B29K,F16L

Abstract:
A heat insulating and noise reducing duct comprising:a reinforcing core (1) made of hard polyolefin resin material and wound spirally at predetermined intervals;a felt layer (2) wound spirally so that adjacent side edge portions of said felt layer (2) are lapped over or brought into contact with each other, while the shape of said felt layer is retained by said reinforcing core (1);a foam strip layer (3) made of polyolefin resin material and wound spirally on an outer circumferential surface of said felt layer (2) so that adjacent side edge portions of said foam strip layer (3) are in abutment against or in tight contact with each other; anda resin-coating layer (4) provided to cover an outer circumferential surface of said foam strip layer (3).