HIGH ADHESIVE PROPERTY EASY RELEASABLE MULTILAYER BLOW MOLDING AND MOLDING METHOD THEREFOR

摘要

PURPOSE: To hold high adhesive properties between layers when using as a product and to easily and clearly release the respective layers if it is intended to mechanically release by applying an internal pressure to a molding in a mold by foaming expansion, and specifying the dimensional shrinkage factor of the molding after mold releasing. ;CONSTITUTION: A multilayer parson formed with thermoplastic resin A as the part of an outer layer side and thermoplastic resin B as an inner layer side by using the two types of the resins A, B in which the resins A, B are not chemically stuck to each other and the magnification relationship of the molding shrinkage factor (a) of the former and that (b) of the latter is ab is mold clamped by a split mold split into a plurality to be shaped by blow molding. The inner pressure is applied to a molding in the mold, and the dimensional shrinkage factor (p) of the molding after mold releasing is suppressed to a numeric value (a). As one example of the molding, the entirety of a substantially recessed surface outer layer 2 and inner layer 3 indicates the part bearing a role as the structural member of a bumper.;COPYRIGHT: (C)1996,JPO