Knitted wire carrier with locking stitch for weather seal backing
This provides a knitted wire carrier that incorporates a locking stitch that passes through the warp threads adjacent to the wire weft. In one embodiment, the locking stitch constructed from a “heat-activated yarn” consisting of an underlying material having exhibiting minimal shrinkage under application of heat and an outer heat-activated adhesive coating that fuses to the warp and wire weft when heated. In another embodiment, the locking stitch is constructed from a composite yarn having at least one meltable thread and a plurality of shrink-resistant threads braided together so as to avoid distorting shrinkage upon heating to melt and fuse the meltable thread.
1. A knitted wire carrier comprising:
a wire bent into a zigzag orientation of segments joined by bends so as to define a length of extension and a width;
a warp knitted along the length around the segments; and
a heat-activated yarn, the heat-activated yarn comprising a bundle of filaments covered in a meltable adhesive, the heat-activated yarn passing through the warp in engagement with the wire and being adhesively joined to each of the segments and warp by the melted adhesive, the adhesive adapted to melt by a predetermined heat and the filaments and warp each adapted to remain substantially unmelted by the predetermined heat.
2. The knitted wire carrier as set forth in claim 1 wherein the heat-activated yarn comprises a bundle of polyester filaments covered with the meltable adhesive.
3. The knitted wire carrier as set forth in claim 2 wherein the warp comprises a plurality of polyester-filament yarns provided in a cluster along predetermined portions of the width of the wire.
4. The knitted wire carrier as set forth in claim 3 wherein the predetermined portions include each of opposing widthwise ends of the wire.
5. The knitted wire carrier as set forth in claim 4 wherein the predetermined portions further include a central portion of the wire between opposing widthwise ends.
6. The knitted wire carrier as set forth in claim 4 wherein the wire defines a propeller blade shape.
7. The knitted wire carrier as set forth in claim 4 wherein the segments are approximately parallel to each other and are joined by approximately 180 degree bends therebetween.
8. A knitted wire carrier comprising:
a wire bent into a zigzag orientation of segments joined by bends so as to define a length of extension and a width;
a warp knitted along the length around the segments; and
a composite yarn having at least some fusible/meltable/shrinkable filaments at a predetermined temperature and some substantially non-fusible/meltable/shrinkable filaments at the predetermined temperature passing through the warp in engagement with the wire and being adhesively joined to each of the segments and warp.
9. The knitted wire carrier as set forth in claim 8 wherein the composite comprises a bundle of polyester filaments and a bundle of polypropylene filaments.
10. The knitted wire carrier as set forth in claim 9 wherein the warp comprises a plurality of polyester-filament yarns provided in a cluster along predetermined portions of the width of the wire.
11. The knitted wire carrier as set forth in claim 10 wherein the predetermined portions include each of opposing widthwise ends of the wire.
12. The knitted wire carrier as set forth in claim 11 wherein the predetermined portions further include a central portion of the wire between opposing widthwise ends.
13. The knitted wire carrier as set forth in claim 12 wherein the wire defines a propeller blade shape.
14. The knitted wire carrier as set forth in claim 12 wherein the segments are approximately parallel to each other and are joined by approximately 180 degree bends therebetween.
15. A method for forming a knitted wire carrier having a wire bent into a zigzag orientation of segments joined by bends so as to define a length of extension and a width, and a warp knitted along the length around the segments, comprising the steps of:
inserting a locking stitch composed of a heat-activated yarn, with a bundle of filaments and an adhesive coating covering the filaments, through the warp in engagement with the wire; and
applying a predetermined heat to cause the adhesive coating in the heat-activated yarn to melt and fuse to each of the warp and the wire while the bundle of filaments and the warp remains substantially unmelted at the predetermined heat.
16. A method for forming a weather seal with a wire carrier having a wire bent into a zigzag orientation of segments joined by bends so as to define a length of extension and a width, and a warp knitted along the length around the segments, comprising the steps of:
inserting a locking stitch composed of a composite yarn having at least some fusible/meltable/shrinkable filaments at a predetermined temperature and some substantially non-fusible/meltable/shrinkable filaments at the predetermined temperature through the warp in engagement with the wire; and
applying a heat in conjunction with application of a weather seal material to the wire carrier to cause the fusible/meltable/shrinkable filaments to fuse, melt and shrink with respect to the warp and the wire.
17. The method as set forth in claim 16 further comprising the step of, before the step of applying, initially heating the composite yarn to cause the fusible/meltable/shrinkable filaments to fuse, melt and shrink with respect to the warp and the wire and thereafter allowing the fusible/meltable/shrinkable filaments to cool.