Method for injection-molding a fan

A method for injection-molding a plastics propeller fan by using a fixed-side mold section (12) and movable-side mold section (13), comprises the steps of providing a movable core (14) at an area corresponding to a thicker portion (31b) of a blade section (31a) of the propeller fan; after a predeter...

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Main Authors TODA, NAOKI, SUZUKI, ATSUSHI, KONDOH, FUMIO, NOMURA, MANABU, INOUE, MASASHI, SAKUMA, MATSUO, GOUDA, HIROFUMI
Format Patent
LanguageEnglish
French
German
Published 24.07.2002
Edition7
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES
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:A method for injection-molding a plastics propeller fan by using a fixed-side mold section (12) and movable-side mold section (13), comprises the steps of providing a movable core (14) at an area corresponding to a thicker portion (31b) of a blade section (31a) of the propeller fan; after a predetermined amount of plastics material has been injected into a blade space of a mold cavity (15) defined by the fixed-side mold section (12), movable-side metal section (13) and movable core (14) and conforming to the propeller fan, pushing out the movable core (14) into the mold cavity and, after this step, bringing the movable core (14) back to a normal position conforming to a mold shape defining the blade space and forming a proper fan.
Bibliography:Application Number: EP20010100973