Self-wrapping, braided textile sleeve with self-sustaining expanded and contracted states and method of construction thereof
A self-wrapping protective textile sleeve and method of construction is provided. The sleeve includes a braided, tubular wall having opposite free edges extending lengthwise between opposite ends. The wall has a first state with a decreased length, increased cross-sectional area and a second state with an increased length, decreased cross-sectional area, as viewed in cross-section taken generally transversely to a central longitudinal axis. The wall further includes braided, heat-set yarns imparting a bias on the wall, wherein the bias causes the wall to self-wrap into a tubular configuration and to remain substantially in the first and second states absent some externally applied force.
1. A self-wrapping protective textile sleeve, comprising:
a braided, tubular wall having opposite free edges extending lengthwise between opposite ends; and
said wall having a first state with a decreased length, increased cross-sectional area, as viewed in cross-section taken generally transversely to a central longitudinal axis extending between said opposite ends, and a second state with an increased length, decreased cross-sectional area, as viewed in cross-section taken generally transversely to said central longitudinal axis, and further including braided, heat-set yarns imparting a bias on said wall, said bias causing said wall to remain in said first and second states absent some externally applied force and bringing said opposite free edges into overlapped relation with one another.
2. The self-wrapping protective sleeve of claim 1 wherein at least some of said heat-set yarns are braided in bundles, said bundles including a plurality of yarns twisted with one another.
3. The self-wrapping protective sleeve of claim 2 wherein at least some said bundles have loops interlinked with loops of another bundle.
4. The self-wrapping protective sleeve of claim 3 wherein at least some of said bundles are formed entirely of said heat-set yarns.
5. The self-wrapping protective sleeve of claim 3 wherein said wall includes non-heat-settable yarns.
6. The self-wrapping protective sleeve of claim 5 wherein at least some of said non-heat-settable yarns extend through at least some of said loops.
7. The self-wrapping protective sleeve of claim 6 wherein at least some of said non-heat-settable yarns extend co-helically between a pair of said bundles.
8. The self-wrapping protective sleeve of claim 3 wherein at least some of said bundles include non-heat-settable yarn.
9. The self-wrapping protective sleeve of claim 1 wherein said wall includes non-heat-settable yarns.
10. The self-wrapping protective sleeve of claim 2 wherein said bundles extend solely in one of a S or Z helical direction.
11. The self-wrapping protective sleeve of claim 2 wherein said bundles extend in opposite S and Z helical directions.
12. The self-wrapping protective sleeve of claim 1 wherein said wall has a non-circular outer periphery.
13. A method of constructing a self-wrapping textile sleeve, comprising:
braiding a plurality of yarns with one another to form a wall extending lengthwise along a central longitudinal axis between opposite ends with at least some of said yarns being provided as heat-settable yarns, said wall being moveable between a decreased length, increased cross-sectional area first state and an increased length, decreased cross-sectional area second state;
forming said wall having opposite free edges extending lengthwise between said opposite ends; and
wrapping said opposite free edges toward one another and heat-setting said heat-settable yarns with said wall being in one of said first state and second state to form heat-set yarns that impart a bias on said wall, said bias causing said wall to self-wrap about the central longitudinal axis into a tubular configuration and causing said wall to remain in each of said first and second states absent an externally applied axial force causing said wall to be moved to the other of said first or second states.
14. The method of claim 13 further including braiding said wall with a lace-braiding machine.
15. The method of claim 13 further including braiding said wall as a seamless, circumferentially continuous wall and then cutting said wall lengthwise to form said opposite free edges.
16. The method of claim 15 further including performing the heat-setting step prior to performing the cutting.
17. The method of claim 15 further including performing the heat-setting step after performing the cutting.
18. The method of claim 13 further including braiding said wall as a flat layer having said opposite free edges.
19. The method of claim 18 further including wrapping said wall about a mandrel and then performing the heat-setting.
20. The method of claim 13 further including forming the wall including non-heat-settable yarn.
21. The method of claim 13 further including forming at least some of the yarns as bundles of yarn twisted with one another.
22. The method of claim 21 further including forming at least some of the bundles entirely with heat-settable yarn.
23. The method of claim 21 further including forming at least some of the bundles including non-heat-settable yarn.
24. The method of claim 21 further including interlinking loops of one bundle with loops of another bundle to interlock the bundles with one another.