Composite upper for shoe with selectively disposed bonding agent
Footwear fabrication methods are disclosed, having reduced material consumption and/or waste requirements, compared to conventional methods, as well as the footwear articles made by such methods. The fabrication methods and articles are characterized by the selective use of a bonding agent, in the form of a powder or tackified (e.g., preheated) powder, to bond various material panels, such substrate, mesh, and/or skin panels in the formation of a composite panel (e.g., a bonded mesh composite panel), which may in turn be used to provide a footwear upper and ultimately an article of footwear. The bonding agent is particularly applicable to fabrication processes utilizing a combination of heat and pressure for bonding or fusing material panels, each having a suitable composition, size, shape, and thickness, into the particular configuration of the footwear upper.
1. A layered material structure comprising a bonded composite comprising:
(a) a substrate layer and
(b) at least one additional layer,
wherein a bonding agent is selectively deposited, as a powder or a tackified powder, over only a subset of an area of overlap between the substrate layer and the at least one additional layer.
2. The layered material structure of claim 1 , wherein the layered material structure is an apparel item or a component thereof or a sporting goods item or a component thereof.
3. The layered material structure of claim 2 , wherein the apparel item is a glove, a sock, a hat, a helmet, a jacket, or an item of skiwear, and wherein the sporting goods item is a football, a basketball, a baseball, a volleyball, or a golf ball.
4. The layered material structure of claim 1 , wherein the subset of the area of overlap is a perimeter region of the area of overlap.
5. The layered material structure of claim 1 , wherein the subset of the area of overlap is a region defined by an overlay in the area of overlap.
6. The layered material structure of claim 5 , wherein the overlay is a screen, a template, or a stencil.
7. The layered material structure of claim 1 , wherein the subset of the area of overlap is a region forming a pattern, shape, image, or design.
8. The layered material structure of claim 1 , wherein the subset of the area of overlap includes regions of different thicknesses or different colors of the powder or tackified powder.
9. The layered material structure of claim 1 , wherein the powder or tackified powder comprises a thermoplastic polymer.
10. The layered material structure of claim 9 , wherein the thermoplastic polymer has a melting temperature from about 80° C. to about 120° C.
11. The layered material structure of claim 9 , wherein the thermoplastic polymer is a thermoplastic polyurethane.
12. The layered material structure of claim 9 , wherein the thermoplastic polymer is selected from the group consisting of a polyester, a polyamide, a vinyl acetate polymer, a polyether, and blends thereof.
13. The layered material structure of claim 1 , wherein, in the powder or tackified powder, the bonding agent has an average particle size of less than about 500 microns (μm).
14. The layered material structure of claim 13 , wherein the average particle size is from about 100 μm to about 400 μm.
15. The layered material structure of claim 1 , wherein the bonding agent is selectively deposited over from about 10% to about 90% of the area of overlap.
16. The layered material structure of claim 15 , wherein the bonding agent is selectively deposited over from about 30% to about 80% of the area of overlap.
17. The layered material structure of claim 1 , wherein the tackified powder is obtained by heating or combination with a paste forming agent.
18. The layered material structure of claim 17 , wherein the paste forming agent is a weak aqueous-based adhesive or a weak organic-based adhesive.
19. The layered material structure of claim 1 , wherein the tackified powder has a particle size from about 1 μm to about 100 μm.