TWO SHOT INJECTION MOLDING PROCESS FOR THERMOPLASTIC PARTS

TWO SHOT INJECTION MOLDING PROCESS FOR THERMOPLASTIC PARTS

Two shot injection molding processes are disclosed for making thermoplastic parts of two different compositions, the second shot composition having a higher thermal conductivity than the first, and the mold cavity surface temperature is greater than 70° C., preferably 70-100° C. In embodiments, the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: DAVIS, Terry, ROBBINS, James, LORENZO, James, MCCANNA, Jessee
Format: Patent
Sprache:eng
Schlagworte:
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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Beschreibung
Zusammenfassung:Two shot injection molding processes are disclosed for making thermoplastic parts of two different compositions, the second shot composition having a higher thermal conductivity than the first, and the mold cavity surface temperature is greater than 70° C., preferably 70-100° C. In embodiments, the cavity surface temperature is within 20° C. of the Vicat temperature for the composition being injected, the cavity pressure is between 20 and 150 MPa, and the melt temperature of the second shot material is 200-400° C., or 250-340° C. The resulting molded part provides for improved thermal conductivity between the two molded compositions.