B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
154/29
B65B 51/22 (2006.01) B29C 65/00 (2006.01) B29C 65/08 (2006.01) B29C 65/48 (2006.01)
Patent
CA 1071082
ABSTRACT OF THE DISCLOSURE A method and apparatus for forming a seal between layers of thermoplastic coated paperboard or the like wherein there are different numbers of layers and varying thicknesses at different locations within the area to be sealed. The appa- ratus includes an anvil having a work surface for engaging one outer surface of the layers and a horn that vibrates at a pre- determined frequency when energized. The horn has a work sur- face that opposes the work surface of said anvil. The anvil and horn are mounted for movement relative to each other be- tween a retracted inactive position and an extended sealing position in which the opposed work surfaces engage the layers of thermoplastic coated paperboard to be sealed in a clamping relationship. A control circuit is operable for sequentially; (1) pre-triggering said horn, to energize it and cause it to vibrate; (2) moving said anvil and energized horn into the sealing position to clamp the paperboard layers therebetween and maintaining the clamping pressure over the entire area of the layers within predetermined limits, (3) holding the ener- gized horn in the sealing position with respect to the anvil for a predetermined period of time to cause the thermoplastic coating of the paperboard layers between the work surfaces to be activated to flow, (4) deenergizing the horn to terminate the vibration thereof, (5) holding the anvil and deenergized horn in the sealing position with the paperboard layers clamped between the work surfaces thereof for a predetermined period of time to permit the activated thermoplastic coating to set, and (6) retracting the horn and anvil with respect to each other to unclamp the sealed paperboard layers.
270554
Bosche Eugene R.
Walke Earl W. (jr.)
Ex-Cell-O Corporation
Na
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