Patent ID: 6616872
Filing Date: 2003-09-09
Classification: B29C

Abstract:
A method of determining a separating force of a molded product from a mold in an injection molding machine, comprising the steps of:driving an ejector mechanism in a molding operation without injection of resin and obtaining and storing a load exerted on the ejector mechanism at predetermined periods or predetermined positions in driving the ejector mechanism; driving an ejector mechanism in a molding operation with injection of resin to produce a molded product in the mold, and obtaining a load exerted on the ejector mechanism at the predetermined periods or predetermined positions in driving the ejector mechanism; and obtaining a difference between the load obtained and stored in driving the ejector mechanism without the molded product and the load obtained in driving the ejector mechanism with the molded product in the mold as a separating force of the molded product at the predetermined periods or predetermined positions of the ejector mechanism.