Vacuum plug assist molding

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Process of molding thermoplastic sheet by plug assist vacuum forming

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.