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...

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Bibliographische Detailangaben
Hauptverfasser:	DAVIS, Terry, ROBBINS, James, LORENZO, James, MCCANNA, Jessee
Format:	Patent
Sprache:	eng ; fre ; ger
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.