Polypropylene endless loop and the method therefor

Details Polypropylene endless loop and the method therefor Polypropylene endless loop and the method therefor

1979-09-25

1981-09-01

Dixon, Jr., William R.

Textiles: spinning, twisting, and twining

Strand structure

Endless bands

57 21, 24 16PB, 24 17B, 24 17AP, 24 305P, 474239, 150 11, 150 12, 229 63, 264103, 264295, 264564, 428 36, D02G 336, B65D 6300, D02G 120

Patent

active

042864291

ABSTRACT:
A method is disclosed for preparing polypropylene endless loop by blow-moulding polypropylene raw materials into tubular sheet, drawing the same transversely to an extent to provide a draw ratio of at least 4, and before or after the drawing step, cutting the tubular sheet to form individual endless loops, then twisting the cut and drawer loops to provide a twisted endless loop. The preferred polypropylene endless loop product is also disclosed.

REFERENCES:
patent: 2061392 (1936-11-01), Wheeler
patent: 2496047 (1950-01-01), Goddard
patent: 2802513 (1957-08-01), Stoeckel et al.
patent: 2851787 (1958-09-01), Gordon
patent: 2950152 (1960-08-01), Garceau
patent: 3889872 (1975-06-01), Lin
patent: 3995506 (1976-12-01), Poe
patent: 3997943 (1976-12-01), Jones et al.
patent: 4158250 (1979-06-01), Ringwald

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