| 摘要 |
A HEAT INSULATING NOISE REDUCING DUCT INCLUDES: AN INTERNAL LAYER (10) FORMED BY HELICALLY WINDING A FLAT FIBROUS BAND (1) AND INTEGRALLY BONDING OUTER CIRCUMFERENTIAL FACES OF ADJACENT JOINT PARTS OF THE BAND BY RESIN REINFORCING BANDS (12) TO THEREBY FORM A SUBSTANTIALLY SMOOTH CYLINDRICAL SHAPE; ONE OR MORE RESIN LINEAR BODIES (13) HELICALLY WOUND BETWEEN THESE ADJOINING RESIN REINFORCING BANDS (12) AND BONDED TO THE FIBROUS BAND (1); AND OPEN-CELL FOAM (20) LAYER FORMED BY HELICALLY WINDING AN OPEN-CELL FOAM RESIN BAND (2) ONTO AN OUTER CIRCUMFERENTIAL FACE OF THE INNER LAYER (10) WHILE MAKING ITS PAIRED SIDE EDGES ABUT EACH OTHER; AN INTERMEDIATE SHEET LAYER (30) FORMED BY HELICALLY WINDING A THIN RESIN SHEET-LIKE (3) BAND ONTO AN OUTER CIRCUMFERENTIAL FACE OF THE OPEN-CELL FOAM BAND (2) WHILE PARTIALLY OVERLAPPING THE RESIN SHEET-LIKE BAND (3), AND BY INTEGRALLY BONDING THE OVERLAPPED PARTS; A CLOSED-CELL FOAM LAYER (40) FORMED BY HELICALLY WINDING A CLOSED-CELL FOAM RESIN BAND (4) ONTO AN OUTER CIRCUMFERENTIAL FACE OF THE SHEET LAYER WHILE MAKING ITS PAIRED SIDE EDGES ABUT EACH OTHER; AND AN EXTERNAL LAYER (50) FORMED BY HELICALLY WINDING A THIN RESIN SHEET-LIKE BAND (5) ONTO AN OUTER CIRCUMFERENTIAL FACE OF THE CLOSED-CELL FOAM LAYER (40) WHILE PARTIALLY OVERLAPPING THE RESIN SHEET-LIKE BAND (5) AND BY INTEGRALLY BONDING THE OVERLAPPED PARTS. THE FIBROUS BAND (1), THE RESIN REINFORCING BAND (12), THE RESIN LINEAR BODY (13), THE OPEN-CELL FOAM RESIN BAND (2), THE RESIN BAND (3) FORMING THE INTERMEDIATE SHEET LAYER (30), THE CLOSED-CELL FOAM RESIN BAND (4), AND THE RESIN BAND (5) FORMING THE EXTERNAL LAYER (50) ARE WOUND AT AN IDENTICAL HELICAL PITCH.(FIG. 1) |
