Intermittently stretching thermoplastic with nip rolls

Details Intermittently stretching thermoplastic with nip rolls Intermittently stretching thermoplastic with nip rolls

1985-10-18

1987-03-31

Schmidt, Frederick R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264DIG73, 26 71, 493211, 493225, 493338, 493461, 493928, D02J 106, B31B 2364

Patent

active

046541802

ABSTRACT:
A draw tape for thermoplastic bags is made by feeding tape to a first pair of nip rolls rotating at a relatively slow speed and a second pair rotating at a fast speed. The tape is stretched to form thin and narrow central portions between end portions of unstretched tape. The first nip rolls are increased in speed, or are released to interrupt the stretching. When the rolls are closed, one of them is momentarily retarded or backed up, to produce a rapid transition in the tape between the unstretched end portion and the stretched central portion.

REFERENCES:
patent: 1125363 (1968-08-01), Jortikka
patent: 1878085 (1933-02-01), Dreyfus et al.
patent: 1920824 (1933-08-01), West
patent: 2038722 (1936-04-01), Dreyfus et al.
patent: 2296394 (1942-09-01), Meloon
patent: 2341823 (1944-02-01), Smith
patent: 2545868 (1951-03-01), Bailey
patent: 3029853 (1962-04-01), Piazze
patent: 3084731 (1963-04-01), Kugler
patent: 3539680 (1970-11-01), Fukushima et al.

Affiliated with

Also associated with

Rating

Intermittently stretching thermoplastic with nip rolls does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intermittently stretching thermoplastic with nip rolls, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intermittently stretching thermoplastic with nip rolls will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2211895