Process for preparing dimensionally stabilized biaxially stretch

Details Process for preparing dimensionally stabilized biaxially stretch Process for preparing dimensionally stabilized biaxially stretch

1997-06-24

1999-03-23

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

2642358, 264342RE, B29C 5516

Patent

active

058855017

ABSTRACT:
An improved process for preparing a biaxially stretched thermoplastic film, such as polyethylene naphthalate (PEN) or polyethylene terephthalate (PET) film, having low thermal shrinkages by simultaneous biaxial stretching of the film in a tenter frame using linear electrical motors to drive the tenter clips. The film is relaxed in the machine direction (MD) and the transverse direction (TD) by converging the paths of the tenter clips and decelerating the tenter clips during heat-setting to provide film having tailored levels of MD and TD shrinkages.

REFERENCES:
patent: 3150433 (1964-09-01), Kampf
patent: 4985537 (1991-01-01), Utsumi et al.
patent: 5051225 (1991-09-01), Hommes et al.
patent: 5429785 (1995-07-01), Jolliffe

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