Filament coating process
AssigneePolyplus, Inc.
InventorsDonald G. Needham, William Kinzie, James H. Harris
Life of this patent
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Abstract
The present invention provides a novel filament coating process. Useful filaments include high strength, reinforcing fiber such as fiberglass. By the process, a filament bundle is transversely spread and individual filaments are coated. In a particular application, pultruded rod may be advantageously made from the coated filament.
Claims20
A filament coating process comprising applying a mass of molten coating material to a nip formed by a first coating roll and a second coating roll comprising a relief area of a selected depth, passing a bundle of filaments into said nip, and as said filaments pass through said nip in an area defined by said relief area, transversely spreading said bundle of filaments by force exerted upon said filaments and applying said coating material to said filaments.
A filament coating process comprising applying a mass of molten coating material to a nip formed by a first coating roll and a second coating roll, passing a bundle of filaments into said nip, and as said filaments pass through said nip, transversely spreading said bundle of filaments and applying said coating material to said filaments, and thereafter passing said coated filaments and an excess of said coating material from said nip, and by a second mass of said coating material thereby originating from said mass of coating material, said second mass having collected below and feeding a second coating nip formed by said second coating roll and a third coating roll, further coating said coated filaments as said filaments pass through said second coating nip.
A filament coating process comprising applying a mass of molten coating material to a nip formed by a first coating roll and an idler roll adjustably mounted for the nip engagement with said first coating roll, passing a bundle of filaments into said nip, and as said filaments pass through said nip, transversely spreading said bundle of filaments and applying said coating material to said filaments, and thereafter passing said coated filaments from said nip through a second coating nip formed by said idler roll and a third roll, said idler roll being eccentrically mounted between said first coating roll and said third roll and being able to bear upon said first coating roll and said third roll.
A filament coating process comprising applying a mass of molten coating material to a nip formed by a first coating roll and a second coating roll, passing a plurality of bundles of filaments into said nip, and as said filaments pass through said nip, transversely spreading said bundles of filaments by force exerted upon said filaments and applying said coating material to said filaments, and thereafter applying a fabric to the transversely spread and coated filaments.
A process for making formed composite, said process comprising applying a mass of molten coating material to a nip formed by a first coating roll and a second coating roll, passing a bundle of filaments into said nip, and as said filaments pass through said nip, transversely spreading said bundle of filaments and applying said coating material to said filaments;
- thereafter preheating a plurality of filament strands thereby coated;
- thereafter passing said plurality of preheated strands into a pultrusion die which is at a defined temperature near but not more than the melt temperature of said coating material, downstream of an entrance to said die;
- and thereafter pulling formed composite comprising said plurality of filament strands, from said pultrusion die.
Dependencies are inferred from the claim text.