Process and apparatus for heat setting biaxially oriented tubula

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

1975-10-06

1977-12-06

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264210R, 264290R, 264342R, 264342RE, 425445, B29C 2500

Patent

active

040617076

ABSTRACT:
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.degree. C.-240.degree. C. in the first zone of heat setting and thereafter declines to about 195.degree. C.-215.degree. 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 heating 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 shrinkage 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.

REFERENCES:
patent: 2916764 (1959-12-01), Gerber
patent: 3257489 (1966-06-01), Heffelfinger
patent: 3296352 (1967-01-01), Riggs
patent: 3548042 (1970-12-01), Hinrichs
patent: 3595836 (1971-07-01), Korneli et al.
patent: 3788503 (1974-01-01), Hirose et al.
patent: 3814785 (1974-06-01), Reade

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