| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-molded article which is lightweight and excellent in rigidity while having uneven product thickness and enables molding defect in molding to be reduced. SOLUTION: The blow-molded article 1 made of a thermoplastic resin and having a double wall structure with a hollow part, includes: a first wall part 10a; a second wall part 10b, wherein the second wall part 10b is opposed to the first wall part 10a at an interval so as to define the hollow part and has a region 11 where the interval is relatively short and a region 12 where the interval is relatively long; and a plurality of lib lines 20 provided in the hollow part and arranged to be substantially parallel to each other. Each lib line 20 is configured by a plurality of libs 21 arranged in a line, and a main ventilation passage 22 through which air for blow molding flows is provided between the adjacent libs 21 in each lib line 20. The main ventilation passages 22 in the adjacent lib lines 20 are arranged so as not to be overlapped each other in the view from a direction intersecting the lib line direction, and an auxiliary ventilation passage 23 through which the air for blow molding is circulated is opened in the lib 21. COPYRIGHT: (C)2011,JPO&INPIT
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