SOUND-ABSORBING AND HEAT-INSULATING DUCT

THERE IS PROVIDED A SOUND-ABSORBING AND A HEAT-INSULATING DUCT COMPRISING A NONWOVEN CLOTH LAYER (1), A REINFORCING CORE (2), A FOAM STRIP LAYER (3), A BONDING RESIN (4) AND RESIN-COATING LAYER (5). THE NONWOVEN CLOTH LAYER (1) IS FORMED BY WOUND SPIRALLY A NONWOVEN CLOTH (10) INTO A TUBE-LIKE SHAPE IN WHICH ADJACENT SIDE EDGES OF THE ADJACENT NONWOVEN CLOTHS (10) ARE BROUGHT IN ABUTMENT AGAINST OR LAPPED WITH EACH OTHER SO AS TO FORM A BONDING PORTION (1A). THE REINFORCING CORE (2) MADE OF HARD SYNTHETIC RESIN MATERIAL IS WOUND SPIRALLY ON THE BONDING PORTION (1A) WHILE A SURFACE OF THE REINFORCING CORE (2) BEING BROUGHT INTO CONTACT WITH THE NONWOVEN CLOTH (10) IS WELDED OR BONDED TO THE NONWOVEN CLOTH (10). THE FOAM STRIP LAYER (3) IS FORMED BY WOUND SPIRALLY A FOAM RESIN STRIP (30) HAVING A WIDTH APPROXIMATELY EQUAL TO A WIDTH OF THE NONWOVEN CLOTH (10). BOTH ADJACENT EDGES (3A, 3B) OF THE FOAM RESIN STRIP ARE DISPOSED ON ADJACENT REINFORCING CORES (2, 2) RESPECTIVELY. THE BONDING RESIN (4) IS APPLIED TO A SIDE SURFACE (30B) OF THE FOAM STRIP (30) AND A PART (2A) OF THE REINFORCING CORE (2). THE RESIN- COATING LAYER (5) IS PROVIDED TO COVER AN OUTER CIRCUMFERENTIAL SURFACE OF THE FOAM STRIP LAYER (3). ACCORDINGLY, IT IS POSSIBLE TO PROVIDE A SOUNDABSORBING AND HEAT-INSULATING FUNCTIONS, WHICH IS SUITABLE FOR USE AS AN AIR-BLOW DUCT, AND WHICH IS SUITABLE FOR CONTINUOUS PRODUCTION SO THAT THE DUCT CAN BE MASS-PRODUCED INEXPENSIVELY.(FIG 3)