Composite fishing line
View Patent ↗Braided or twisted lines made from a) gel spun polyolefin yarns and b) at least one other yarn or monofilament are stretched to increase line tenacity. If desired, stretching conditions can also be chosen to significantly reduce the denier of the line.
1. A composite fishing line with a net negative buoyancy in water, said fishing line comprising:
(a) a first line component consisting essentially of a first yarn of filaments made of ultrahigh molecular weight, high tenacity, polyolefin filaments, and
(b) a second line component comprising a second yarn or a monofilament selected from the group consisting of:
(A) partially-oriented filament yarns comprising partially oriented (i) poly(trimethylene terephthalate) yarn, (ii) poly(trimethylene terephthalate)/poly(alpha-hydroxy acid) biconstituent filaments, (iii) polyethylene terephthalate, (iv) nylon, (v) polyamides and copolymers of polyamides, or (vi) polyvinylidene fluoride;
(B) poly(tetrafluoroethylene); and
(C) expanded poly(tetrafluoroethylene), said second line component exhibiting a specific gravity of greater than 1.0,
wherein said composite fishing line has been re-drawn by stretching said composite fishing line under tension and heat at conditions sufficient to increase tenacity of the resulting fishing line by at least 10% relative to its tenacity before the stretching.
2. A composite fishing line according to claim 1 wherein said first yarn is made with filaments of polyethylene that exhibit a tenacity of at least 15 g/denier and a tensile modulus of at least 500 g/denier.
3. A composite fishing line according to claim 2 wherein said second filamentous line component is made with said second yarn that comprises filaments of expanded poly(tetrafluoroethylene) or poly(tetrafluoroethylene).
4. A composite fishing line according to claim 1 comprising 2-5 first component yarns of said first line component and 2-5 second component yarns of said second line component.
5. A composite fishing line according to claim 4 wherein said first line component and said second component have been braided or twisted together to form said composite fishing line.
6. A composite fishing line according to claim 5 wherein said fishing line has been re-drawn by stretching the composite fishing line under tension and heat at conditions sufficient to increase tenacity of the resulting fishing line by at least about 15% relative to its tenacity before the stretching.
7. A composite fishing line according to claim 6 wherein said fishing line has been re-drawn by stretching the composite fishing line at a temperature within the range of about 110° C. to about 160° C. and at a total draw ratio within the range from about 1% to about 1000%.
8. A composite fishing line according to claim 6 wherein said fishing line has been re-drawn at a temperature within the range of about 135° C. to about 155° C.
9. A process for increasing tenacity in a sinking, composite fishing line comprising: (a) a first line component consisting essentially of a first yarn of filaments made of ultrahigh molecular weight, high tenacity, polyolefin and (b) a second line component comprising a second yarn or a monofilament, said second component exhibiting a specific gravity of greater than 1.0; said process comprising a step of:
stretching the composite fishing line under tension and heat at conditions sufficient to increase tenacity of the resulting fishing line by at least 10% relative to its tenacity before the stretching.
10. A process according to claim 9 wherein the stretching step comprises stretching said composite fishing line at a temperature within the range of about 135° C. to about 155° C.
11. A process according to claim 10 wherein the stretching step comprises stretching said composite fishing line to a total draw ratio within the range from about 1.01 to about 9.0.
12. A process according to claim 9 wherein said first yarn consists essentially of filaments of polyethylene that exhibit a tenacity of at least 15 g/denier and a tensile modulus of at least 500 g/denier.
13. A process according to claim 12 wherein said second line component comprises a second yarn that comprises an oriented or partially oriented polymer.
14. A process according to claim 13 wherein said second yarn comprises filaments of expanded poly(tetrafluoroethylene).
15. A process according to claim 13 wherein the stretching step comprises
stretching said composite fishing line to a total draw ratio within the range from about 1.05 to about 3.0.
16. A process according to claim 13 wherein the stretching step comprises
stretching said composite fishing line to a total draw ratio within the range from about 1.1 to about 2.0.
17. A process according to claim 13 wherein the stretching step comprises
stretching said composite fishing line to a total draw ratio within the range from about 1.25 to about 1.5.
18. A composite fishing line according to claim 1 wherein said second line component comprises a partially-oriented polyethylene terephthalate yarn.