Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1990-05-01
1991-09-03
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428108, 428192, B32B 512
Patent
active
050453769
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a reinforced polymeric article and in particular, although not exclusively, to tyre tread breaker reinforcement material, generally known as breaker fabric.
The rubber tread of a pneumatic tyre is subjected to repeated deformation due to compression and expansion of the rubber at the point of contact with the road surface. This deformation is the major cause of tread wear and it is now known that the wear can be considerably reduced by introducing an inextensible but flexible band or belt between the tread and the ply carcass, in the area occupied by conventional breakers.
The present invention seeks to provide a reinforced polymeric article, such as a breaker fabric for a pneumatic tyre, which exhibits good resistance to extension at least in one direction, which is flexible and which also facilitates attaining good adhesion to an adjacent component.
In accordance with one of its aspects the present invention provides a flexible reinforced polymeric article comprising at least one layer of flexible polymeric material and at least two flexible reinforcement elements secured to said polymeric material, one flexible element which extends successively to and fro across the polymeric material from a first edge region toward a second edge region and back to the first edge region, a second flexible element which extends successively to and fro across the polymeric material from the second edge region toward the first edge region and back to the second edge region and successive portions of said second flexible element being arranged to lie in spaces between successive portions of the first flexible element extending to and from said first edge region whereby successive portions of each element lie interdigitated with successive portions of the other element in a manner free of cross-over of the elements.
The to and fro disposition of the two reinforcement elements may result, in effect, in a zig-zag lay of the elements.
Each flexible reinforcement element may extend across an elongate layer of flexible polymeric material either at right angles or obliquely, typically at an oblique angle in the range 18 to 90 degrees relative to the length of the layer. Preferably all portions of the reinforcement elements are substantially parallel with one another in a central region between said edge regions.
It is further preferred that each element has at least one intermediate portion which interconnects portions of the element in the central region and extends in a direction substantially parallel with the direction of the length of the layer. That intermediate portion preferably is of a length greater than the spacing of the interconnected central region portions of the element as considered in said direction of the length of the layer.
The successive intermediate portions of an element at a respective edge region and also intermediate portions of that element remote from said edge region may extend parallel with the direction of the layer.
Alternatively only one of the series of successive intermediate portions at said edge region or remote from said edge region may extend substantially parallel with the direction of the length of the layer. In this case it is preferred that it is the series of successive intermediate portions at a respective edge region, rather than the series remote thereform, which extends substantially parallel with the direction of the length of the layer. Thus in the resulting construction each element provides one outer edge reinforcement lying at a bias angle of the order of 0 degrees and substantially adjacent a remote intermediate portion of the other element where that other element extends across substantially the entire width to said one outer edge.
The flexible reinforced polymeric article preferably comprises two of said layers of flexible polymeric material arranged in superimposed relationship with the flexible reinforcement elements therebetween. The elements may be sandwiched between two layers one of which is wider than the other, edge portions of the wider l
REFERENCES:
patent: 4161559 (1979-07-01), Bosse
patent: 4325999 (1982-04-01), Campman et al.
Holroyd Eric
Perkins David J. B.
Bell James J.
Bridgestone/Firestone Inc.
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