Process of molding thermoplastic sheet by plug assist vacuum for

Details Process of molding thermoplastic sheet by plug assist vacuum for Process of molding thermoplastic sheet by plug assist vacuum for

1992-09-21

1994-11-22

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264554, 425388, B29C 5110, B29C 5122

Patent

active

053666852

ABSTRACT:
A process of molding a thermoplastic sheet for making blister packaging. The process particularly includes premolding steps of brining the sheet into close contact with the outer cylindrical surface of a molding drum, preheating the sheet and concurrently vacuum sucking the sheet into a cavity defined on the outer cylindrical surface of the drum, to partially form a pocket in the sheet, and a full-molding step of vacuum sucking the sheet and concurrently inserting the sheet into the cavity by means of a plug so that the pocket is conformed to the shape of the plug.

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Philip F. Charles, Vacuum Systems for Thermoforming Plastics World, vol. 21 #4, Apr. 1963 pp. 34-39.

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