| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight duct for an vehicle having excellent low temperature impact property wherein the kind of a mixed material is reduced by the inexpensive material constitution.SOLUTION: A resin A is high density polyethylene having a long-chain branching structure of 0.95-0.96, a melt flow rate (MFR) of 3-7 g/10 min and a melt tension of 100-250 mN. A resin B is high density polyethylene having the melt flow rate (MFR) of 0.3-1.0 g/10 min. A foamable resin wherein a chemical foaming agent of 1-3 pts.wt. is added to a mixed resin of 100 pts.wt. mixing the resin A of 60-30 pts.wt. with the resin B of 40-70 pts.wt. is used in the duct 1 blow molded from a foamed parison extruding a foamable resin. |
