B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/51, 93/60
B31B 1/66 (2006.01) B29C 65/00 (2006.01) B29C 65/08 (2006.01) B31B 3/64 (2006.01) B65B 51/22 (2006.01)
Patent
CA 1046322
ABSTRACT OF THE DISCLOSURE Apparatus for forming a seal between layers of a car- ton of thermoplastic coated paperboard material and the like wherein the thermoplastic material in the area to be sealed serves as the sealant and is activated to flow by frictional heat generated by a vibration welding horn and is then allowed to cool and set under pressure to form the seal between the layers. The carton first moves to an activating station wherein the layers to be sealed are engaged on opposite surfaces by a vibrating horn and a back-up means for a time sufficient to activate the thermoplastic material to flow. The carton is then carried to one or more clamping and sealing stations at a dif- ferent location from the activating station with the thermo- plastic material in the activated state. The layers to be sealed with the activated thermoplastic is then engaged on oppo- site surfaces by a pressure pad and a back-up means for a pre- determined period of time to permit the activated thermoplastic to cool and set and form a seal.
279102
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