1. A manufactured article comprising a body formed of a fiberresin composite material having a powder coating thereon wherein the powder coating includes at least 40 volume-% of chopped reinforcing fiber.
2. The manufactured article as in claim 1 wherein the chopped reinforcing fiber has a maximum dimension of 100 \u03bcm in the direction of elongation.
3. The manufactured article as in claim 1 wherein the average particle size of the powder coating is about 5 \u03bcm to about 200 \u03bcm.
4. The manufactured article as in claim 1 wherein the average particle size is about 45 \u03bcm and the maximum dimension of the chopped reinforcing fiber in the direction of elongation is 20 \u03bcm.
5. The manufactured article as in claim 1 wherein the fiberresin composite material is a composite comprising an epoxy resin and fibers having a length of 10 mm or more and selected from the group consisting of glass, carbon, aramid or ultrahigh molecular weight polyolefin fibers and mixtures thereof.
6. The manufactured article as in claim 1 wherein in normal use of the device the article is an elongated structure subject to substantial bending stresses applied transverse of the direction of elongation.
7. The manufactured article as in 1 wherein the article is a member of the group consisting of archery bow components, composite springs, boat hulls, paddles, oars, sailing masts, rackets, fishing rods, and various components of bicycles, automobiles, motorcycles and aircraft that are subjected to high flexural loads.
8. The manufactured article as in claim 1 wherein the article is an archery bow limb.
9. The manufactured article as in claim 1 wherein the article includes a surface coated by said powder coating which, before application of the powder coating, had exposed fiber ends of said composite material.
10. The manufactured article as in claim 9 wherein said exposed fiber ends were produced by machining the composite material.
11. The manufactured article as in claim 1 wherein the chopped fibers in the powder coating are selected from the group consisting of carbon, aramid or ultrahigh molecular weight polyolefins.
12. The manufactured article as in claim 1 wherein the chopped fibers have a minor dimension which is the maximum dimension in the direction perpendicular to the direction of elongation which is in the range of about 0.7-15 nm.
13. An epoxy resin powder paint formulation wherein the formulation comprises at least 40% by volume of a chopped reinforcing fiber.
14. The epoxy resin powder paint formulation as in claim 19 wherein the chopped fibers in the powder coating are selected from the group consisting of carbon, aramid or ultrahigh molecular weight polyolefins.
15. A fiber reinforced composite article, wherein said article is a archery bow limb having a side under compression when the limb is in use, and at least a machined surface portion of the compression side where material of the composite had been removed to expose fiber ends, and a powder coating on at least said machined surface portion, wherein the powder coating comprises a powder coating resin and at least 40% by weight of chopped fibers having a length in the direction of elongation less than the size of the applied powder coating particles.
16. The article as in claim 15 wherein the chopped fibers have a minor dimension which is the maximum dimension in the direction perpendicular to the direction of elongation which is in the range of about 0.7 to 15 nm.
17. A method comprising:
preparing a fiber reinforced thermoset composite article;
machining surfaces on the article so as to expose ends of the reinforcement fiber;
coating at least the machined surfaces with a powder coating comprising reinforcing fibers and a curable resin, and;
subjecting the powder coating to conditions to effect curing of the powder coating curable resin.
18. The method as in claim 17 wherein the article is a member of the group consisting of archery bow components, composite springs, boat hulls, paddles, oars, sailing masts, rackets, fishing rods, and various components of bicycles, automobiles, motorcycles and aircraft that are subjected to high flexural loads.
19. The method as in claim 18 wherein the article is an archery bow limb and the curable resin in the powder coating is a thermosetting epoxy.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method for determining a dither matrix comprising:
(a) transposing multiple pairs of pixels of a parent dither pattern to form at least one candidate pattern;
(b) determining a cost function value for each of the at least one candidate patterns;
(c) selecting at least one low cost pattern corresponding to at least one low cost function value;
(d) reducing the multiple pairs of pixels to transpose;
(e) transposing the reduced multiple pairs of pixels in the selected at least one low cost pattern;
(f) determining a subsequent cost function value for each of the at least one transposed low cost patterns;
(g) selecting at least one subsequent low cost pattern corresponding to at least one subsequent low cost value;
(h) repeating steps (d-g) until a determined cost value threshold is met.
2. The method as set forth in claim 1, wherein the multiple pairs of pixels are multiples of two.
3. The method as set forth in claim 1, wherein selecting selects five low cost patterns corresponding to the five lowest cost function values.
4. The method as set forth in claim 2, wherein reducing reduces the number of pairs of pixels to transpose by a factor of 2.
5. The method as set forth in claim 1, wherein pixels of each pair of pixels are separated by spacing selected from the group consisting of subdivisions of the pattern and a minimal radial offset.
6. The method as set forth in claim 5, wherein step (d) further comprises reducing the minimal radial offset each time step (d) is repeated.
7. The method as set forth in claim 1, wherein the determined cost value threshold comprises determining whether a lowest cost function value of one repetition is below a predetermined percentage of a prior repetition.
8. The method as set forth in claim 1, wherein the subsequent low cost pattern is used for patterns selected from the group consisting of gray scale dither patterns, three color dither patterns and four color dither patterns.
9. The method as set forth in claim 1, further comprising increasing the size of the dither patterns to have better invariance to tiling operations.
10. The method as set forth in claim 1, further comprising selecting said parent dither pattern to include selecting randomly half of the parent dither pattern to be black.
11. The method as set forth in claim 5, wherein subdivisions are quadrants of the pattern.
12. A system comprising:
a parent dither pattern comprising pixels;
a processor coupled to receive the parent dither pattern, said processor transposing multiple pairs of pixels of a parent dither pattern to form at least one candidate pattern; determining a cost function value for each of the at least one candidate patterns; selecting at least one low cost pattern corresponding to at least one low cost function value; reducing the multiple pairs of pixels to transpose; transposing the reduced multiple pairs of pixels in the selected at least one low cost pattern; determining a subsequent cost function value for each of the at least one transposed low cost patterns; selecting at least one subsequent low cost pattern corresponding to at least one subsequent low cost value, and performing iterations of reducing, transposing determining and selecting until a determined cost value threshold is met.
13. The system as set forth in claim 12, wherein the multiple pairs of pixels are multiples of two.
14. The system as set forth in claim 12, wherein selecting selects five low cost patterns corresponding to the five lowest cost function values.
15. The system as set forth in claim 13, wherein reducing reduces the number of pairs of pixels to transpose by a factor of 2.
16. The system as set forth in claim 12, wherein pixels of each pair of pixels are separated by spacing selected from the group consisting of subdivisions of the pattern and a minimal radial offset.
17. The system as set forth in claim 16, wherein reducing further comprises reducing the minimal radial offset for each iteration.
18. The system as set forth in claim 12, wherein the determined cost value threshold comprises a lowest cost function value of one repetition which is below a predetermined percentage of a prior repetition.
19. The system as set forth in claim 12, wherein the subsequent low cost pattern is used for patterns selected from the group consisting of gray scale dither patterns, three color dither patterns and four color dither patterns.
20. A computer readable medium comprising instructions, which when executed by a processing system perform the method comprising:
(a) transposing multiple pairs of pixels of a parent dither pattern to form at least one candidate pattern;
(b) determining a cost function value for each of the at least one candidate patterns;
(c) selecting at least one low cost pattern corresponding to at least one low cost function value;
(d) reducing the multiple pairs of pixels to transpose;
(e) transposing the reduced multiple pairs of pixels in the selected at least one low cost pattern;
(f) determining a subsequent cost function value for each of the at least one transposed low cost patterns;
(g) selecting at least one subsequent low cost pattern corresponding to at least one subsequent low cost value;
(h) repeating steps (d-g) until a determined cost value threshold is met.
21. The computer readable medium as set forth in claim 20, wherein the multiple pairs of pixels are multiples of two.
22. The computer readable medium as set forth in claim 20, wherein selecting selects five low cost patterns corresponding to the five lowest cost function values.
23. The computer readable medium as set forth in claim 21, wherein reducng reduces the number of pairs of pixels to transpose by a factor of 2.
24. The computer readable medium as set forth in claim 20, wherein pixels of each pair of pixels are separated by spacing selected from the group consisting of subdivisions of the pattern and a minimal radial offset.
25. The computer readable medium as set forth in claim 24, wherein step (d) further comprises reducing the minimal radial offset each time step (d) is repeated.
26. The computer readable medium as set forth in claim 20, wherein the determined cost value threshold comprises determining whether a lowest cost function value of one repetition is below a predetermined percentage of a prior repetition.
27. The computer readable medium as set forth in claim 20, wherein the subsequent low cost pattern is used for patterns selected from the group consisting of gray scale dither patterns, three color dither patterns and four color dither patterns.
28. The computer readable medium as set forth in claim 20, further comprising increasing the size of the dither patterns to have better invariance to tiling operations.
29. The computer readable medium as set forth in claim 20, further comprising selecting said parent dither pattern to include selecting randomly half of the parent dither pattern to be black.
30. The computer readable medium as set forth in claim 24, wherein subdivisions are quadrants of the pattern.