Process and apparatus for heat setting biaxially oriented...

Details Process and apparatus for heat setting biaxially oriented... Process and apparatus for heat setting biaxially oriented...

B - Operations, Transporting

29

C

18/527

B29C 71/02 (2006.01) B29C 55/28 (2006.01)

Patent

CA 1064210

PROCESS AND APPARATUS FOR HEAT SETTING BIAXIALLY ORIENTED TUBULAR POLYETHYLENE TEREPHTHALATE FILMS Abstract of the Disclosure A process for continuously heat setting a tubular film of biaxially oriented polyethylene terephthalate in a state expanded with a gaseous material and taking the heat set film up on a winder which comprises carrying out the heat setting in a heat setting chamber wherein the temperature is controlled so as to be initially in the range of about 220°C.-240°C. in the first zone of heat setting and thereafter declines to about 195°C.-215°C. in the final zone while the length of the film is increased about 2% - 7% and the diameter of the film is reduced about 5 - 15% from the corresponding dimensions of the film before heat setting, the film then being taken up by a rotary winder. An apparatus for carrying out the described process is also provided which comprises a heating chamber having heat- ing means dividing the chamber into zones so as to supply a hot blast in each zone of a different temperature from the other zones and rotatable means for controlling the stretch and shrink- age of the tubular film in the heating chamber and handling the film after it leaves the chamber comprising adjustable pinch rolls, film collapsing means and a winder, all mounted in fixed relation to one another.

237232

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