COMPRESSION MOLDING OF COMPOSITE PARTS ON HOT MOLD SURFACES WITH A SHORT CYCLE TIME

A molding system is provided comprising a cold mold with a large thermal mass and contoured thin mold inserts (15,17) with a low thermal mass. A composite sheet blank (11) of glass fibers in a thermoplastic matrix resin is placed between the inserts, heated and then transported to the cold mold. The...

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Bibliographic Details
Main Author KIM, BANG MO
Format Patent
LanguageEnglish
Published 11.07.1990
Edition4
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
PERFORMING OPERATIONS
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
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Summary:A molding system is provided comprising a cold mold with a large thermal mass and contoured thin mold inserts (15,17) with a low thermal mass. A composite sheet blank (11) of glass fibers in a thermoplastic matrix resin is placed between the inserts, heated and then transported to the cold mold. The composite sheet is pressed in the cold mold between the mold inserts to flow form and then cool the part. The mold inserts keep the surfaces of the composite sheet hot during the forming process, thereby enabling the matrix resin to flow and form smooth surfaces.
Bibliography:Application Number: EP19890102918