Patent ID: 8043537
Filing Date: 2011-10-25
Classification: B29C

Abstract:
1. An injection molding system comprising: an injection molding machine including a mold clamping device for opening and closing a mold and an injection device for injecting a molding material into a cavity of said mold; a heating medium supply device for supplying a heating medium to a heat medium passage formed in said mold for heating said cavity; a cooling medium supply device for supplying a cooling medium to said heat medium passage for cooling said cavity; and a control unit for controlling supply of said heating medium and said cooling medium by said heating medium supply device and said cooling medium supply device, supplying said heating medium to said heat medium passage to heat said cavity when said molding material is injected from said injection device into said cavity, and supplying said cooling medium to said heat medium passage in conjunction with an injection step of said molding material to cool said cavity, wherein said control unit starts the injection of said molding material or stops heating of said cavity during the injection before a temperature of said cavity reaches a predetermined temperature range so that the temperature of said cavity does not exceed the predetermined temperature range during the injection of said molding material due to a delay of heat transfer after the supply of the heating medium is stopped, and then maintains the temperature of said cavity within said predetermined temperature range after the temperature of said cavity reaches said predetermined temperature range and until said cooling medium is supplied to start cooling of said cavity, wherein the temperature of said cavity is maintained within said predetermined temperature range by alternating between natural heat dissipation with the stop of the supply of the heating medium and reheating with the supply of the heating medium.