INJECTION MOLDING METHOD AND MOLD ASSEMBLY USING IT

PROBLEM TO BE SOLVED: To provide an injection molding method constituted so as to enhance the strength of a welded part without requiring the addition of a special device or the like. SOLUTION: A first runner 23A and a second runner 23B are provided between a sprue 21 and a cavity 20 and the first f...

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Bibliographic Details
Main Authors TAKESUE SHINJI, SHIOTANI YUJI, MORIWAKI TAKESHI
Format Patent
LanguageEnglish
Published 03.03.2005
Edition7
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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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Summary:PROBLEM TO BE SOLVED: To provide an injection molding method constituted so as to enhance the strength of a welded part without requiring the addition of a special device or the like. SOLUTION: A first runner 23A and a second runner 23B are provided between a sprue 21 and a cavity 20 and the first flow of a molten material passed through the first runner 23A is allowed to flow in the cavity 20 by selecting only the first runner 23A. Subsequently, by selecting the first and second runners 23A and 23B, the second flow of the molten material passed through the second runner 23B is allowed to flow in the cavity in the vicinity of the confluent part of the first flow so as to be temporally delayed with respect to the first flow. In this injection molding method, the selection only of the first runner 23A and the selection of the first and second runners 23A and 23B are changed over by the advance/retreat of an ejector pin 26 for the sprue. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030206326