HEAT SEALING DEVICE FOR HEAT SEALING SEAMS ON THERMOPLASTIC OVERWRAPS ON PACKETS

摘要

Improvements in devices for the welding of thermoplastic material wrappers, particularly in cigarette wrappers and the like that intermittently follow one another along a mobile wrapper line at different speed levels, in a plurality of stations, in correspondence of one or more of which one or more of such devices act according to actuation means provided with reciprocating movement, characterized in that a welder consisting of a substantially wedge-shaped body with vertex that constitutes the welding end facing towards the wrapping line and developed so that it is provided in the immediate proximity of said vertex with a heat source and with the terminal of a probe for the measurement and control of temperature, with sheets of thermally insulating material being provided with such a configuration that, at the time of the op eration of welding, come to be found, inserted between said body, up to the proximity of the contact zone of said welding end with the thermoplastic casing. (Machine-translation by Google Translate, not legally binding)