Process and apparatus for the manufacture reinforcing metallic c

Details Process and apparatus for the manufacture reinforcing metallic c Process and apparatus for the manufacture reinforcing metallic c

1998-05-28

2000-02-08

Stryjewski, William

Textiles: spinning, twisting, and twining

Apparatus and processes

With wire or strand preforming or shaping

57 5852, 57 5883, 57352, 57902, D01H 1326

Patent

active

060216336

ABSTRACT:
A cord comprising at least a first pair and a second pair of wires (2a, 2b) of different diameter randomly disposed in transverse cross section thereof, is obtained by arranging in a nacelle (7) of a double-twisting laying machine, a twister (16) operating upstream of a preformer (15). The twister (16), rotating in a direction opposite to that of the impeller (5) and at a speed which is twice that of the impeller, neutralizes the internal torsional stresses induced in the wires (2a, 2b) by effect of the double twisting carried out upon the action of the impeller itself. Thus, a better control of the preforming operation executed on the wires (2a, 2b) disposed parallel in respectively coplanar axes is enabled. The obtained cord (1), within each laying pitch and only under a traction condition involving a load not exceeding 5 kg, has at least one right cross section in which at least one wire (2a, 2b) is spaced apart from at least one of the adjacent wires so as to facilitate the rubberizing step, by enabling access of the blend to the cross section and penetration thereof along the cord axis. The cord is preferably used as a reinforcing element for the belt structure.

REFERENCES:
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patent: 4335571 (1982-06-01), Tarantola
patent: 4399853 (1983-08-01), Morimoto et al.
patent: 4599853 (1986-07-01), Varga-Papp
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patent: 5338620 (1994-08-01), Van Ooij et al.
patent: 5370168 (1994-12-01), Boiocchi et al.
patent: 5408819 (1995-04-01), Nishimura et al.
patent: 5564268 (1996-10-01), Thompson
Research Disclosure, Dec. 1982, No. 22404, "Bi-Diameter construction of steel tire cord".

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