Textiles: spinning – twisting – and twining – Apparatus and processes – With wire or strand preforming or shaping
Patent
1998-05-15
2000-11-28
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
With wire or strand preforming or shaping
57284, 57311, 57 1UN, D01H 1326
Patent
active
061518794
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a wire filament, particularly for reinforcing rubber or plastic articles, a method of production thereof as well as to a device for implementing the method.
BACKGROUND OF THE INVENTION
Wire filaments of the for reinforcing rubber or plastic articles are known. These are used in particular to produce steel cords which are employed as inserts in pneumatic tires for motor vehicles to improve their ride, dynamics and stability as well as to extend their useful life.
Prior to wire filaments being combined and further processed into steel cords they are pretreated and preshaped since as drawn filaments, in the absence of suitable preshaping, they have a fatigue strength which is too low and, in addition, tend to wander out of the tires when straight. In preatreatment, care needs to be taken that the wire filaments do not suffer from the treatment. Particularly when being shaped via gearwheels and the like the high-strength wire filaments receive local pressure points which make them unsuitable for cyclic loading, since such local deformities are the starting points for fatigue fracture occuring.
From DE-AS 1 159 818 a method of producing elastic wire ropes is known, according to which for producing elastic wire ropes of low tension and free of twist in production the wires used in configuring the wire rope are twisted into the range of permanent deformation and then return twisted by twice the range of the windings made up to the return limit. The return limit in this sense is a constant maximum number of twists which a given wire is capable of returning after twisting. Twists exceeding this return limit are not returned, but instead are retained as permanent deformations.
From DE 39 14 330 C2 a method of producing a wire bundle or rope is known in which for stranding the wires they are placed and/or twisted about each other and the resulting strands further twisted together in their direction of twist by means of an overtwist means. By further twisting the strand the latter is twisted past its range of elastic deformation into the range of plastic deformation. To reduce the problems associated with the differing residual torsions of strands produced in such a way, the strand receives downstream of the overtwisting device a low constant tensile stress.
SUMMARY OF THE INVENTION
The invention is thus based on the object of defining a wire filament which possesses a good fatigue strength and can be well anchored in rubbers or plastics.
A further object of the invention involves proposing a method of producing such wire filaments which is simply and cost-effectively implementable.
Furthermore, it is the object of the invention to provide a device for implementing such a method which is configured simple and variable and integratable in the production line of a steel cord.
To achieve the object according to the invention a wire filament, particularly for reinforcing rubber or plastics articles, is proposed which is spirally shaped and exhibits no elastic residual torsional stresses. Due to configuring the wire filament according to the invention with a spiral shape, which may be a left-handed or right-handed, it can be anchored particularly well in rubbers or plastics. This proves to be particularly of advantage when the wire filament is employed in reinforcing tires, since a wire filament according to the invention is then under loading unable to more or less simply work itself out of the tire. This advantage also translates to steel cords produced of such wire filaments for reinforcing pneumatic tires. Since the wire filament according to the invention exhibits no residual torsional stresses it permits further processing particularly well and simple, which especially during incorporation in the tire during the vulcanization process is of advantage. Also no forces and torques detrimenting the ride and dynamics of the tire originate from the wire filament worked into the tire.
As regards the further achievement of the object forming the basis of the invention a m
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Drahtcord Saar GmbH & Co. KG
Stryjewski William
LandOfFree
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