Patent ID: 8394304

Claim:
A method for compression molding synthetic resin moldings comprising: a metering process for metering a synthetic resin raw material made of thermoplastic elastomers having a viscoelasticity in a melted state or compositions thereof fed from a feeding path in a top force for feeding, wherein said metering process comprises: filling a prescribed amount of said melted synthetic resin raw material into a cavity in a closed mold formed by the feeding path in the top force for feeding and an opening portion of a bottom force; extending said melted synthetic resin raw material contained in said feeding path in an axial direction by lowering said bottom force relative to said top force for feeding, wherein the lowering of said bottom force is made during a process where an outer surface of said synthetic resin raw material contained in said opening portion of said bottom force is solidified and while both an internal portion of said synthetic resin raw material contained in said opening portion of said bottom force and said synthetic resin raw material contained in said feeding path of said top force for feeding are maintained in a melted state, and tearing off the portion extended in the axial direction by further lowering said bottom force to provide a prescribed amount of the resin block for molding such that the resin raw material which substantially equals to the shape molded; and a compression process for compressing said resin block for molding of said synthetic resin raw material that is metered in said metering process by the top force for molding and molding said resin block, wherein said compression process is a separate process from said metering process and uses a top force for molding, said compression process comprising: shifting the torn and metered resin block for molding which has been placed in and remains in said bottom force, together with said bottom force, to a compressing station, and compressing said resin block continuously by the top force for molding and molding said resin block.