Plastic sheet reinforcement
View Patent ↗A strip-form touch fastener component includes a resin base having a front surface from which an array of molded plastic fastener elements project, and a reinforcing knit fabric directly laminated to a side of the resin base opposite the fastener elements, the fabric having float filament sections extending generally along an outer surface of a back side of the fastener component. The float sections are connected to the back side of the fastener component only at their ends, and otherwise lie against the back side of the fastener component to reinforce the resin base against tearing.
1. A strip-form touch fastener component comprising
a resin base having a front surface from which an array of fastener elements project, each fastener element having
a stem extending contiguously from the front surface of the base and formed of resin forming at least a portion of the base; and
a head disposed on the stem above the base and forming an overhang for releasably engaging fibrous loops; and
a reinforcing fabric on a side of the resin base opposite the fastener elements, the fabric comprising two distinct layers of yarns, including
an anchor layer facing the resin base and comprising filaments embedded within resin of the base to anchor the fabric to the base; and
an outer layer comprising float filament sections extending generally along an outer surface of a back side of the fastener component, such sections connected to the back side of the fastener component only at their ends, and otherwise lying against the back side of the fastener component.
2. The touch fastener component of claim 1 wherein the float filament sections extend generally straight between their connected ends.
3. The touch fastener component of claim 2 wherein the float filament sections are substantially free of resin of the base between their ends.
4. The touch fastener component of claim 1 wherein the float filament sections extend no more than about 0.3 millimeter from a back surface of the resin base.
5. The touch fastener component of claim 4 wherein the float filament sections at least about 0.03 millimeter from the back surface of the resin base.
6. The touch fastener component of claim 4 wherein the float filament sections extend about 0.15 millimeter from the back surface of the resin base.
7. The touch fastener component of claim 1 wherein the float filament sections have an average float length of at least about two millimeters.
8. The touch fastener component of claim 7 wherein the average float length is between about 2 and 10 millimeters.
9. The touch fastener component of claim 1 wherein an average float length of the float filament sections is more than about 10 times as long as a nominal distance the float filament sections extend from a back surface of the resin base.
10. The touch fastener component of claim 1 wherein the float filament sections are arranged in a pattern of at least about 150 float filament sections per square centimeter of the back side of the fastener component.
11. The touch fastener component of claim 1 wherein the float filament sections are sections of filaments of multifilament yarns of the reinforcing fabric.
12. The touch fastener component of claim 1 wherein the float filament sections extend in a direction generally across the strip-form fastener component.
13. The touch fastener component of claim 1 wherein the yarns are multifilament yarns.
14. The touch fastener component of claim 13 wherein each yarn contains from 10 to 13 discrete filaments.
15. The touch fastener component of claim 13 wherein the yarns are between about 20 and 170 denier.
16. The touch fastener component of claim 13 wherein each yarn filament is between about 2 and 40 denier.
17. The touch fastener component of claim 1 wherein the reinforcing fabric is a knit fabric, knit to define a technical face and a technical back.
18. The touch fastener component of claim 17 wherein the technical face faces the resin base, with the technical back providing the float filament sections.
19. The touch fastener component of claim 18 wherein the technical back is in an unnapped condition.
20. The touch fastener component of claim 17 wherein the float filament sections extend no more than about 0.3 millimeter from a back surface of the resin base.
21. The touch fastener component of claim 20 wherein the float filament sections at least about 0.03 millimeter from the back surface of the resin base.
22. The touch fastener component of claim 17 wherein an average float length of the float filament sections is more than about 10 times as long as a nominal distance the float filament sections extend from a back surface of the resin base.
23. The touch fastener component of claim 17 wherein an average float length of the float filament sections is between about 2 and 10 millimeters.
24. The touch fastener component of claim 17 wherein the reinforcing fabric is a warp knit fabric.
25. The touch fastener component of claim 24 wherein the fabric comprises between about 20 and 60 courses per inch.
26. The touch fastener component of claim 25 wherein the fabric comprises between about 47 and 55 courses per inch.
27. The touch fastener component of claim 24 wherein the fabric comprises between about 15 and 60 wales per inch.
28. The touch fastener component of claim 27 wherein the fabric comprises between about 32 and 38 wales per inch.
29. The touch fastener component of claim 17 wherein the fabric is stabilized in a post-knit, cross-wale stretch condition.
30. The touch fastener component of claim 1 having a Stitch Hole Tear Strength of at least 2.0 pounds.
31. A strip-form touch fastener component comprising
a resin base having a front surface from which an array of fastener elements project, each fastener element having
a stem extending contiguously from the front surface of the base and formed of resin forming at least a portion of the base; and
a head disposed on the stem above the base and forming an overhang for releasably engaging fibrous loops; and
a reinforcing fabric directly laminated to a side of the resin base opposite the fastener elements, the fabric comprising a knit material with float filament sections extending generally along an outer surface of a back side of the fastener component, such sections connected to the back side of the fastener component only at their ends, and otherwise lying against the back side of the fastener component.
32. The touch fastener component of claim 31 wherein the float filament sections extend generally straight between their connected ends.
33. The touch fastener component of claim 32 wherein the float filament sections are substantially free of resin of the base between their ends.
34. The touch fastener component of claim 31 wherein the float filament sections extend no more than about 0.3 millimeter from a back surface of the resin base.
35. The touch fastener component of claim 34 wherein the float filament sections at least about 0.03 millimeter from the back surface of the resin base.
36. The touch fastener component of claim 34 wherein the float filament sections extend about 0.15 millimeter from the back surface of the resin base.
37. The touch fastener component of claim 31 wherein the float filament sections have an average float length of at least about two millimeters.
38. The touch fastener component of claim 37 wherein the average float length is between about 2 and 10 millimeters.
39. The touch fastener component of claim 31 wherein an average float length of the float filament sections is more than about 10 times as long as a nominal distance the float filament sections extend from a back surface of the resin base.
40. The touch fastener component of claim 31 wherein the float filament sections are arranged in a pattern of at least about 150 filament sections per square centimeter of the back side of the fastener component.
41. The touch fastener component of claim 31 wherein the float filament sections are sections of filaments of multifilament yarns of the reinforcing fabric.
42. The touch fastener component of claim 31 wherein the float filament sections extend in a direction generally across the strip-form fastener component.
43. The touch fastener component of claim 31 wherein the yarns are multifilament yarns.
44. The touch fastener component of claim 43 wherein each yarn contains from 10 to 13 discrete filaments.
45. The touch fastener component of claim 43 wherein the yarns are between about 20 and 170 denier.
46. The touch fastener component of claim 45 wherein the yarns are about 40 denier.
47. The touch fastener component of claim 43 wherein each yarn filament is between about 2 and 40 denier.
48. The touch fastener component of claim 47 wherein each yarn filament is between about 3 and 5 denier.
49. The touch fastener component of claim 31 wherein the reinforcing fabric is knit to define a technical face and a technical back, the technical face facing the resin base and the technical back providing the float filament sections.
50. The touch fastener component of claim 31 wherein the reinforcing fabric is in an unnapped condition.
51. The touch fastener component of claim 31 wherein the reinforcing fabric is a warp knit fabric.
52. The touch fastener component of claim 51 wherein the fabric comprises between about 20 and 60 courses per inch.
53. The touch fastener component of claim 51 wherein the fabric comprises between about 15 and 60 wales per inch.
54. The touch fastener component of claim 31 wherein the fabric is stabilized in a post-knit, cross-wale stretch condition.
55. The touch fastener component of claim 31 having a Stitch Hole Tear Strength of at least 2.0 pounds.