Multifilament yarn construction
Multifilament yarn constructions include a core part and a sheath part, the core part comprising a plurality of core filaments, and the sheath part comprising a plurality of sheath filaments. Furthermore, members comprising the multifilament yarn construction and uses of the multifilament yarn construction and the members are provided.
1. A multifilament yarn construction comprising a core part and a sheath part, the core part comprising a plurality of core filaments, and the sheath part comprising a plurality of sheath filaments, wherein
the sheath part is between 4 to 40 area- % of a cross section of the multifilament yarn construction,
the sheath part is braided onto the core part,
the width of the multifilament yarn construction is between 0.2 to 5 mm, and
a ratio (a/A) of a cross section area of the multifilament yarn construction (a) to a theoretical cross section area of the multifilament yarn construction (A) is at most 1.5.
2. The multifilament yarn construction according to claim 1 , wherein the ratio a/A is at most 1.3.
3. The multifilament yarn construction according to claim 1 , wherein at least 90 weight- % of the plurality of core filaments and/or at least 90 weight- % of the sheath filaments are filaments with an e-modulus of at least 5 GPa.
4. The multifilament yarn construction according to claim 1 , wherein at least 90 weight- % of the plurality of core filaments and/or at least 90 weight- % of the sheath filaments are selected from the group consisting of high performance polyethylene fibers and high performance aramids fibers.
5. The multifilament yarn construction according to claim 1 , wherein at least 90 weight- % of the plurality of core filaments and/or at least 90 weight- % of the sheath filaments are gel spun ultra high molecular weight polyethylene fibers.
6. The multifilament yarn construction according to claim 1 , wherein the sheath part has a fill factor of at least 7.
7. The multifilament yarn construction according to claim 6 , wherein the fill factor is at least 10.
8. The multifilament yarn construction according to claim 6 , wherein the fill factor is less than 20.
9. The multifilament yarn construction according to claim 1 , wherein the sheath part of the multifilament yarn construction has a braiding angle (α) which is at least 33° and at most 75°.
10. The multifilament yarn construction according to claim 9 , wherein the braiding angle (α) is at least 40°.
11. The multifilament yarn construction according to claim 9 , wherein the braiding angle (α) is at least 45°.
12. The multifilament yarn construction according to claim 9 , wherein the braiding angle (α) is at most 70°.
13. The multifilament yarn construction according to claim 1 , wherein the core part is at least 80 area- % and at most 94 area- % of a cross section of the multifilament yarn construction.
14. The multifilament yarn construction according to claim 1 , wherein the core filaments of the multifilament yarn construction comprise at least 25 filaments.
15. The multifilament yarn construction according to claim 14 ,
wherein the core filaments have an arrangement of either:
i) in parallel;
ii) in parallel with a twist of less than 100 turns per meter;
iii) with the filaments arranged in at least 3 multifilament yarns arranged in a braided, plaited, plied or twisted construction; or
iv) in a combination of at least two of the arrangements i)-iii).
16. The multifilament yarn construction according to claim 1 , having a flexural yield stress, σ 5%,5 , of at least 3 N/mm 2 .
17. The multifilament yarn construction according to claim 16 , wherein the flexural yield stress is at least 5 N/mm 2 and less than 50 N/mm 2 .
18. The multifilament yarn construction according to claim 16 , wherein the flexural yield stress is at least 7 N/mm 2 and less than 30 N/mm 2 .
19. The multifilament yarn construction according to claim 16 , having an exhausted flexural yield stress, σ 5%,5 , of more than 45% of the flexural yield stress, σ 5 %.
20. A member comprising a multifilament yarn construction according to claim 1 .
21. The member according to claim 20 being a rope, a fishing line, a fishing net, a cargo net, an antiballistic article, a kite line, or a medical product.
22. The member according to claim 20 , wherein the member is a medical product selected from the group consisting of a medical implant, a medical repair product, a suture, a cable or a mesh.
23. The member according to claim 20 , further comprising a second multifilament yarn construction that is different from the multifilament yarn construction.
24. The member according to claim 23 , wherein the multifilament yarn construction is arranged near an end of the member.