Method of joining plastic preforms to encapsulate an article

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article

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264249, 427375, B29C 6500

Patent

active

061207195

ABSTRACT:
A method and apparatus are presented for encapsulating an article comprising, for example, a substantially circular turntable (12) having first and second opposed major surfaces (16 & 18), each major surface sharing an outer peripheral sidewall (20). First and second thermoplastic pre-forms (28 & 30) are fitted to sandwich the article and are sealed to encapsulate by rotating a thermoplastic band (32) onto and around the exposed seam (48) while applying pressure (70) and heat (74) to obtain a fused bonded reliable encapsulating joint (72). The method and apparatus presented are particularly well suited for encapsulating metal platens, holders, and internal parts of process equipment used in the semiconductor manufacturing industry to avoid contamination from the encapsulated metal. The method could be used to encapsulate any article having a rotatable outer seam of adjacent polymeric pre-forms residing on a relatively narrow peripheral sidewall surface of the article, which is substantially parallel to the axis of rotation.

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