METHOD AND APPARATUS FOR MANUFACTURING PLASTIC MOLDING FROM FLOWABLE REACTION MIXTURE

• Main Authors: RAFFEL REINER, DUSCHANEK HELMUT, SULZBACH HANS-MICHAEL
• Format: Patent
• Language: English
• Published: 28.05.2002
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a method for manufacturing a molding plastic product for preventing occurrence of foam at an initial time of a shot. SOLUTION: The method for manufacturing the molding plastic product manufactures a polyurethane product molded from a flowable polyol polyisocyanate reaction mixture existing in a mixing chamber. The method comprises a step (a) of introducing the flowable reaction mixture to a mold so that the mixing chamber substantially becomes vacant, and a step (b) of removing a peripheral gas existing in the chamber before repeating the step (a) though the step (a) is finished.