Apparatus in a tube filling and sealing machine for heating portion of the inside of a plastics packaging tube

摘要

The invention relates to an apparatus in a tube filling and sealing machine for heating a portion of the interior surface (2) of a plastics packaging tube (1) which is open at one end. Means are provided for directing a spot type light from at least one light source (S1, S3) to a predetermined level on the interior surface (2) around the internal perimeter of the tube while the tube is rotated, so as to generate heat build-up at said surface in order to soften the plastics material to activation temperature. Said at least one light source will typically be a laser source. A heat sink means (20) is arranged in a position for circumferentially enclosing the tube end at level where said spot type light is swept, said heat sink means being in rotational sliding contact with the tube for improving the transfer of any excess of heat energy.