Poly(ethylene terephthalate) fibrillated tape sewing thread

Details Poly(ethylene terephthalate) fibrillated tape sewing thread Poly(ethylene terephthalate) fibrillated tape sewing thread

1975-11-20

1977-07-19

Queisser, Richard C.

Textiles: spinning, twisting, and twining

Apparatus and processes

Elements

28258, D02G 306, D02G 346

Patent

active

040360032

ABSTRACT:
A low denier, high tenacity poly(ethylene terephthalate) fibrillated tape yarn particularly suited for conversion into a sewing thread which exhibits excellent sewing performance is produced by intimately mixing poly(ethylene terephthalate) polymer with from about 0.1 to 20 percent polypropylene based on the weight of poly(ethylene terephthalate), extruding the polymer mixture in the form of a tape through a slit die having a modified entry port wherein the depth of the slit is greater at both ends than at the middle, at a melt draw down of from about 26:1 to about 75:1, quenching said tape, hot drawing said tape in two stages wherein said tape is initially hot drawn to a draw ratio of from about 3.3 to about 4.2 while being subjected to a temperature of from about 80.degree. to about 140.degree. C, thereafter hot drawing to a total draw ratio of about 5.0 while heated to a temperature about 160 degrees and thereafter subjecting the tape to fibrillation. A slit die with a modified entry port which allows extrusion of a low denier tape at high draw down ratios is also disclosed.

REFERENCES:
patent: 3382663 (1968-05-01), Frielingsdorf
patent: 3402548 (1968-09-01), Wininger, Jr. et al.
patent: 3470685 (1969-10-01), Hall et al.
patent: 3549467 (1970-12-01), Keerchel et al.
patent: 3680303 (1972-08-01), Kim
patent: 3724198 (1973-04-01), Kim
patent: 3884030 (1975-05-01), Baxter et al.

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