Biaxially oriented polyethylene terephthalate film and method of

Details Biaxially oriented polyethylene terephthalate film and method of Biaxially oriented polyethylene terephthalate film and method of

1975-10-20

1977-11-22

Phynes, Lucille M.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

260 75T, B29D 724, B29D 700

Patent

active

040596672

ABSTRACT:
A biaxially oriented polyethylene terephthalate film suitable for making heat-shrinkable bands is provided having machine direction shrinkage, on heating to 100.degree. C. for 5 seconds, of less than 8%; cross-machine direction shrinkage, on heating to 100.degree. C. for 5 seconds, of greater than 40%; and a minimum shrink force at 100.degree. C. of greater than 200 psi.
The film further, and variously, has substantially 0% crystallinity; substantially 0% shrinkage at 78.degree. C.; a maximum gauge deviation of less than 15%; an elongation at break of at least 25% and a tensile strength of at least 6000 psi; haze of less than 8%; and a modulus of at least 200,000 psi.
A method of making such film is provided in which the film is heated, after machine direction stretching and prior to cross-machine direction stretching, to an intermediate temperature (from 100.degree. to 105.degree.) slightly above the temperature at which it is first stretched, to essentially remove machine direction shrinkage.

REFERENCES:
patent: 2784456 (1957-03-01), Grabenstein
patent: 2928132 (1960-03-01), Richards
patent: 3187075 (1965-06-01), Seifried et al.
patent: 3547748 (1970-12-01), D'Onofrio et al.
patent: 3631899 (1972-01-01), Erickson
patent: 3702357 (1972-11-01), Smith
patent: 3873664 (1975-03-01), Curtis et al.
patent: 3903294 (1975-09-01), Abella

Affiliated with

Also associated with

Rating

Biaxially oriented polyethylene terephthalate film and method of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Biaxially oriented polyethylene terephthalate film and method of, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Biaxially oriented polyethylene terephthalate film and method of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2258530