SEALING MACHINE HAVING GAP CONTROL BETWEEN HEAT SEAL COMPONENTS

摘要

A heat sealing machine for sealing layers of a plastic film to each other. The machine includes a pair of flexible, endless opposed heat transfer bands each fronting each other and having a gap therebetween wherein layers of plastic film travel for sealing. Heat sealing components such as heat sealing bars in communication with the heat transfer bands and disposed behind the heat transfer bands are provided with constraints for limiting the inwardlylateral movement thereof to thereby restrict movement thereof such that a bar does not travel beyond the longitudinal mid-line of the gap. In this manner, varying thicknesses of layers of plastic to be sealed can be accommodated without misalignment and jamming.