Heat-sealing apparatus

Abstract

Abstract This apparatus for heat-sealing and cutting plastic wrapping film comprises a moveable, L-shaped upper jaw containing a plurality of lava stone blocks having lower faces, which are V-shaped in cross section. Embedded in and projecting from registering slots formed in the undersides of the blocks at their vertices is a thin metal ribbon. A thermocouple embedded in one block controls a circuit which applies a first or preheat voltage to the ribbon to heat the surrounding blocks, so that when the upper jaw is lowered against layers of film superposed on the lower jaw, its heated undersurfaces seal the layers together without distorting the film. Then an impulse of higher voltage is applied to the ribbon to sever the film. A lubricant is fed to the ribbon, and "Teflon" is used on the lower jaw to prevent fused film from adhering to these parts.

Inventors

• 👤 Mervil C Wheeler

Bibliographic Details