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    • 1. 发明申请
    • MULTILAYERED BLOW MOLDING
    • 多层吹塑
    • WO1995018712A1
    • 1995-07-13
    • PCT/JP1995000015
    • 1995-01-11
    • NIPPON STEEL CHEMICAL CO., LTD.NIPPON STEEL CORPORATIONOHTA, Akira
    • NIPPON STEEL CHEMICAL CO., LTD.NIPPON STEEL CORPORATION
    • B29C49/22
    • B29C49/4802B29C45/00B29C49/0073B29C49/04B29C49/22B29C51/10B29C65/665B29C66/545B29C66/71B29C66/723B29C66/8322B29C2049/4805B29C2049/4807B29C2049/4812B29L2009/001B29L2031/3044Y10T428/1328Y10T428/1352Y10T428/24942B29K2021/00B29K2023/12B29K2055/02B29K2077/00
    • A multilayered blow molding formed of thermoplastic resin layers of a plurality of kinds, and a technical issue of the invention is to obtain a multilayered blow molding adapted to be firmly solidified in normal use thereof without separation and can be readily separated when recycled and reused for respective layers formed of different resins and/or respective areas in a peripheral direction. The multilayered blow molding is constituted such that in a convexly curved portion where a multilayered area of a peripheral wall composed of multiple layers projects substantially convexly from inside to outside, an outer layer is formed of a resin having a greater mold shrinkage rate than that of a resin which forms an inner layer, and in a concavely curved portion where the multilayered area of the peripheral wall sinks substantially concavely from outside to inside, an outer layer is formed of a resin having a smaller mold shrinkage rate than that of a resin which forms an inner layer whereby the respective layers in the entire molding are secured to one another in a fitted condition by clamp forces produced due to differences in mold shrinkage rate among resins which form the respective layers and/or respective areas in a peripheral direction in the multilayered area of the peripheral wall. As a main use, the invention is widely applicable to a field of large-sized industrial products such as bumpers for automobiles.
    • 由多种热塑性树脂层形成的多层吹塑成形体和本发明的技术问题是获得一种适合于在正常使用时被分离而牢固固化的多层吹塑成型体,并且在再循环和再利用时可容易地分离 各层由周向不同的树脂和/或相应的区域形成。 多层吹塑成型体的结构使得在由多层构成的周壁的多层面从内向外突出地突出的凸部中,外层由具有比模内收缩率大的模具收缩率大的树脂形成 形成内层的树脂,并且在周壁的多层区域从外部向内部大致凹陷的凹入弯曲部分中,外层由具有比树脂小的树脂的模具收缩率较小的树脂形成, 形成内层,由此通过由于在形成各层的树脂和/或周边方向上的各个区域之间的模具收缩率的差异而产生的夹紧力,在整个模制品中的各层彼此固定 周边墙的多层面积。 作为主要用途,本发明广泛适用于汽车用缓冲器等大型工业产品领域。