Process of uniformly expanding polymer film

Details Process of uniformly expanding polymer film Process of uniformly expanding polymer film

1994-05-25

1996-04-30

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

264291, B29C 5500, B29C 5520

Patent

active

055122299

ABSTRACT:
An apparatus and process for expanding polymer films such as PTFE films includes gripping the unexpanded film about its periphery with a number of symmetrically disposed gripping members each equidistant from the center of the film. The gripping members are simultaneously rotated through an arc away from the center of the film, as by pivotally securing each gripping member to the end of an associated expansion arm and rotating the end of each expansion arm away from the center of the film while maintaining the gripping members equidistant from the center of the film. The expansion arms are uniformly rotated by a geared shaft powered by a drive mechanism that extends through the wall of an oven for coupling to an external motor. Also disclosed is an expanded PTFE film made in accordance with such process.

REFERENCES:
patent: 2759217 (1956-08-01), Peterson
patent: 2873474 (1959-02-01), Shields et al.
patent: 2912716 (1959-11-01), Frownfelter
patent: 2933759 (1960-04-01), Startzell
patent: 3426118 (1969-02-01), Chapman et al.
patent: 4085175 (1978-04-01), Kenchel
patent: 4187390 (1980-02-01), Gore
patent: 4201351 (1980-05-01), Tolliver
patent: 4304010 (1981-12-01), Mano
patent: 4331624 (1982-05-01), Yazawa et al.
patent: 4374690 (1983-02-01), Canterino et al.
patent: 4614011 (1986-09-01), Nicholas et al.
patent: 4625372 (1986-12-01), Hufnagel et al.
patent: 4647416 (1987-03-01), Seiler, Jr. et al.
patent: 4684424 (1987-08-01), Augason
patent: 4685230 (1987-08-01), Mason, III
patent: 4830061 (1989-05-01), Yamamoto et al.
patent: 4877661 (1989-10-01), House et al.
patent: 4944668 (1990-07-01), Asano et al.
patent: 4963209 (1990-10-01), Chernega et al.
patent: 4966807 (1990-10-01), Harvey et al.
patent: 5036417 (1991-07-01), Aruga et al.
patent: 5084949 (1992-02-01), Rutz et al.
"Film Stretcher" T.M. Long Co., Inc., undated product catalog of Laboratory Instruments, pp. 1-36.

Affiliated with

Also associated with

Rating

Process of uniformly expanding polymer film does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process of uniformly expanding polymer film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of uniformly expanding polymer film will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-626226