BMCの射出成形における予熱の効果

概要

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Unsaturated polyester molding compounds as BMC (bulk molding compound) are generally molded without preheating i.e. under the room temperature. However, the injection molding with preheating can be expected to have such advantages that the curing time is shorter and that the injection pressure is lower. Moreover, in regard to the breakage of glass fiber during flow of BMC into cavity, it is desirable that the viscosity of BMC is low. Such effects can be expected by preheating. Then in this paper, nozzle injection pressure, cavity pressure and injection plunger displacement have been measured in case of preheating BMC. Besides, the flexural strength of injection molded parts of preheating BMC has been investigated. The main results obtained are as follows : 1) The injection molding of preheating BMC made possible to mold in reasonably lower injection set pressure than that of non-preheating. In case of preheating BMC, the maximum pressure in cavity became lower, the curing time became shorter and the locational difference of pressure in cavity was reduced. 2) Preheating BMC made the flexural strength of injection molded parts higher.
日本複合材料学会の論文