THIN-WALLED COMPOSITE SLEEVE
An expandable, hollow, cylindrical thin-walled composite sleeve for use in flexographic printing applications is provided including an optional polymeric resin base layer, at least one filament wound layer over the base layer, and at least one outer non-woven fibrous layer over the filament wound layer. The filament wound layer may comprise filament wound fibers such as fiberglass which are wound around the base layer or sleeve. The non-woven fibrous layer may be in the form of a fiberglass chopped strand mat. The layers provide desirable surface and reinforcement properties to the sleeve.
1 . An expandable hollow cylindrical thin-walled composite sleeve comprising an optional polymeric resin base layer and further including at least one filament wound layer over said base layer and at least one non-woven fibrous layer over said filament wound layer, said non-woven fibrous layer forming the outermost layer on said sleeve.
2 . The composite sleeve of claim 1 wherein said non-woven fibrous layer comprises chopped or continuous fibers adhered together by a polymeric binder.
3 . The composite sleeve of claim 2 wherein said fibers are selected from fiberglass, aramid fibers, carbon fibers, polyester fibers, polypropylene fibers, and blends thereof.
4 . The composite sleeve of claim 1 wherein said non-woven fibrous layer is in the form of a fiberglass chopped strand mat.
5 . The composite sleeve of claim 1 wherein said non-woven fibrous layer is impregnated with a polymeric resin.
6 . The composite sleeve of claim 5 wherein said polymeric resin is selected from unsaturated polyester resins, phenolic resins, epoxy resins, and polyurethane resins.
7 . The composite sleeve of claim 1 wherein said filament wound layer comprises filament wound fibers selected from fiberglass, aramid fibers, carbon fibers, polyester fibers, polypropylene fibers, and blends thereof.
8 . The composite sleeve of claim 7 wherein said filament wound fibers are impregnated with a polymeric resin.
9 . The composite sleeve of claim 8 wherein said polymeric resin is selected from unsaturated polyester resins, phenolic resins, epoxy resins, and polyurethane resins.
10 . The composite sleeve of claim 1 having a total wall thickness of from about 0.30 mm to about 2.0 mm.
11 . The composite sleeve of claim 10 wherein about one-half of the sleeve wall thickness comprises said filament wound layer and about one-half of the thickness comprises said outer non-woven fibrous layer.
12 . The composite sleeve of claim 1 further including an inner layer of non-woven fibrous material between said filament wound layer and said base layer.
13 . The composite sleeve of claim 12 wherein each of said inner layer of non-woven fibrous material, filament wound fiber layer, and outer non-woven fibrous layer comprise about ⅓ of the total thickness of said sleeve.
14 . A method of making a thin-walled composite sleeve in a single pass comprising:
providing a hollow cylindrical support;
optionally applying a base layer of polymer resin to said support;
winding at least one layer of a filament material around said base layer or support to form a filament wound layer;
applying a layer of non-woven fibrous material over said filament wound layer to form an outer layer on said sleeve;
curing said sleeve; and
removing the cured sleeve from said support.
15 . The method of claim 14 including impregnating said filament material with polymeric resin prior to winding said filament material around said base layer or support.
16 . The method of claim 14 including applying an inner layer of non-woven fibrous material over said base layer or support prior to applying said layer of filament wound fibrous material and said outer layer of non-woven fibrous material.
17 . The method of claim 14 wherein said filament wound layer comprises two or more wound filament layers which have been applied in succession.
18 . The method of claim 14 wherein said filament material is wound at an angle of 80° to 90° from the centerline of said support.
19 . The method of claim 14 wherein said filament material is wound at an angle of 30° to 60° from the centerline of said support.
20 . The method of claim 14 wherein a portion of said filament material is wound at an angle of 80° to 90° from the centerline of said support and another portion is wound at an angle of 30° to 60° from the centerline of said support.
21 . The method of claim 14 wherein said non-woven fibrous material comprises two plies.
22 . The method of claim 14 wherein said non-woven fibrous material comprises four plies.
23 . The method of claim 14 wherein said filament material comprises fiberglass.
24 . The method of claim 14 wherein said non-woven fibrous layer comprises a fiberglass chopped strand mat.
25 . An expandable hollow cylindrical thin-walled composite sleeve comprising at least one filament wound layer and at least one non-woven fibrous layer over said filament wound layer, said non-woven fibrous layer forming the outermost layer on said sleeve; wherein said at least one filament wound layer has been impregnated with a polymeric resin.
26 . An expandable hollow cylindrical thin-walled composite sleeve comprising an inner non-woven fibrous layer, a filament wound layer over said non-woven fibrous layer, and an outer non-woven fibrous layer over said filament wound layer; wherein at least one of said layers has been impregnated with a polymeric resin.