DESIGN METHOD FOR OPTIMUM BLOW MOLDING TEMPERATURE BY BLOW MOLDING ANALYSIS

摘要

PURPOSE: To reduce a period of development of products by rnaking analyses while giving a parison, a bottle shape and a blow pressure load with reference to a plurality of blow molding temperatures, finding the functions of molding temperatures to display them on a graph with reference to a maximum thickness or a minimum thickness and evaluating and designing a range of proper molding temperatures before making a mold. ;CONSTITUTION: Surface temperatures of a preform are varied to five levels of 80, 90, 100, 110 and 120°C, fixed input conditions are applied thereto, the analysis and arithmetic operation of blow molding are successively executed, a maximum value and a minimum value for the wall thickness of the preform are obtained and data on each blow molding temperature are graphed. The characteristic curves of the graph are represented by θmax=fmax (T) and θmin=fmin (T). That is, a maximum line and a minimum line of a minimum wall thickness and a maximum wall thickness are set and, in the case where the surface temperatures of the preform are on the axis of abscissa, the surface temperatures of the preform become unsuitable if they exceed or are less than these ranges. Further, the range of an optimum wall thickness is set on the basis of experiences and actual results, and it can be judged that the surface temperatures are in a range of 91 to 108°C.;COPYRIGHT: (C)1995,JPO