Importance

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Abstract

An injection molding method with stamping compression obtains an optical lens or other molded article from thermoplastic resin. A cavity is heated to a temperature at which resin can be maintained in a molten state under normal temperature. Measured and molten resin is injected into the heated cavity through a sprue part, a runner part and a gate part. After the injection, the sprue part is sealed. The injected resin is maintained in the molten state at this time. The injected resin is then hardened in the heated cavity by applying a pressure which can provide a dynamic modulus of elasticity of the resin at the normal temperature and normal pressure. The resin hardened by the pressurization is then cooled to a removal temperature while reducing the pressure so as to maintain the dynamic modulus of elasticity of the resin at the dynamic modulus of elasticity of the resin at normal temperature and normal pressure.

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First Claim