FOAM BLOW MOLDING METHOD

PROBLEM TO BE SOLVED: To provide a method of manufacturing a blow molded plastic material with a high expansion ratio.SOLUTION: Plastic contains a pyrogenic foaming agent. After clamping molds, air in a cavity 4 between a parison 1 and molds 2, 3 is sucked for depressurization as a first step, and a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KINOSHITA MAMORU, FUKUHARA NAONARI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS 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
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method of manufacturing a blow molded plastic material with a high expansion ratio.SOLUTION: Plastic contains a pyrogenic foaming agent. After clamping molds, air in a cavity 4 between a parison 1 and molds 2, 3 is sucked for depressurization as a first step, and at the same time, air is sucked from a blow pin 7 that communicates with an atmosphere into the parison 1, and the parison 1 is expanded to be brought into tight contact with inner surfaces of the molds 2, 3. While continuing depressurization of the inside of the cavity 4, the air in the parison 1 is sucked from the blow pin 7 to depressurize the inside of the parison 1 as a second step. While maintaining depressurized states in the cavity 4 and parison 1, the parison 1 is cooled. The depressurized states are released and the molds are opened to take out a product.