초록 ▼

A compression molding method includes detecting actual internal die pressure of molding material filled into a mold cavity, and regulating the compressive force exerted on the molding material in the mold cavity so as to conform the detected internal die pressure with a predetermined reference inter

A compression molding method includes detecting actual internal die pressure of molding material filled into a mold cavity, and regulating the compressive force exerted on the molding material in the mold cavity so as to conform the detected internal die pressure with a predetermined reference internal die pressure. The compressive force exerted on the molding material is controlled by a mold clamping mechanism or an extruder in accordance with the prescribed reference internal die pressure given in the form of a waveform, thereby to keep the actual internal die pressure of the molding material in the optimum condition. Consequently, molded products of high quality can be produced continuously.

대표청구항 ▼

A compression molding method in which molding material is injected and filled into a mold cavity through a runner and subsequently compressed by a molding material compressive force in the mold cavity separate from the injection pressure, which method comprises the steps: predetermining a desired re

A compression molding method in which molding material is injected and filled into a mold cavity through a runner and subsequently compressed by a molding material compressive force in the mold cavity separate from the injection pressure, which method comprises the steps: predetermining a desired reference internal pressure in the runner leading into the mold cavity, said desired reference internal pressure being in the form of a waveform; continuously detecting the actual internal pressure of the molding material passing through the runner; continuously comparing the actual internal pressure thus detected in the runner with the said predetermined desired reference internal pressure in the runner; continuously regulating the injection pressure so as to conform the detected internal pressure in the runner with said predetermined desired reference internal pressure in the runner; predetermining a desired reference internal die pressure of the molding material filled into the mold cavity, said desired reference internal die pressure being in the form of a waveform; continuously detecting the actual internal die pressure of the molding material filled into the mold cavity; continuously comparing the actual internal die pressure thus detected in the mold cavity with said predetermined desired reference internal die pressure; and continuously regulating the compressive force by which the molding material filled in the mold cavity is compressed so as to conform said detected actual internal die pressure of the molding material filled into the mold cavity with said predetermined desired reference internal die pressure.