Title:
MULTILAYERED BLOW MOLDING
Document Type and Number:
WIPO Patent Application WO/1995/018712
Kind Code:
A1
Abstract:
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.
Inventors:
OHTA AKIRA (JP)
Application Number:
PCT/JP1995/000015
Publication Date:
July 13, 1995
Filing Date:
January 11, 1995
Export Citation:
Assignee:
NIPPON STEEL CHEMICAL CO (JP)
NIPPON STEEL CORP (JP)
OHTA AKIRA (JP)
NIPPON STEEL CORP (JP)
OHTA AKIRA (JP)
International Classes:
B60R19/02; B29C49/00; B29C49/22; B29C49/48; B29C65/66; B32B27/08; B29C45/00; B29C49/04; B29C51/10; B29K105/06; B29L9/00; B29L31/30; (IPC1-7): B29C49/22; B29C49/04
Foreign References:
| JPH06182863A | 1994-07-05 | |||
| JPH06247237A | 1994-09-06 |
Other References:
See also references of EP 0738580A4
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