Patent ID: 6256969
Filing Date: 2001-07-10
Classification: B29C,B65B

Abstract:
A heat sealing apparatus fusing adjacent wall portions of a synthetic resin film sleeve together and forming a seam for a heat sealed, fitted synthetic film wrapping of a package in a wrapping machine comprising:opposing sealing apparatus to seal said film wall portions together, each of said apparatus comprising:a heating element for heating the synthetic resin film;a heat sealing member for transferring heat from the heating element to portions of the film at the location of forming the seam;the heat sealing member being formed of a heat conductive material of a length corresponding to the seam to be formed;the heat sealing member having a film contact strip extending along its length for contacting the synthetic resin film and heating it;the film contact strip of the heat sealing member comprising an arcuate surface extending between the tapering side walls and contacting one of the adjacent wall portions of the film sleeve and engaging the other of the adjacent wall portions of the sleeve and its associated heat sealing member film contact strip arcuate surface and transferring heat from the heating element to the film to fuse the adjacent wall portions of the sleeve together and form the seam;the heat sealing member having an internal channel formed in it for receiving the heating element;a mounting plate for mounting the heat sealing member to the wrapping machine;the heat sealing member having a base surface for mounting with the mounting plate;the heat sealing member including two inwardly tapering side walls extending from the base surface to the film contact strip;the mounting plate having a mounting surface co-extensive with the heating sealing member base surface; andthe mounting plate being formed of a heat insulative material to confine the flow of heat from the heating element into the heat sealing member.