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Method of Aligning Discontinuous Fibers

IP.com Disclosure Number: IPCOM000091187D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Blumentritt, BF: AUTHOR [+2]

Abstract

Tapes reinforced with discontinuous unidirectionally aligned fibers can be generated using a Fourdrinier type machine. Continuous reinforcing fibers, such as glass, graphite or mullite are cut to a required length as dictated by process and property requirements. The lengths are normally 1/4 to 1 inch. The cut fibers are slurried in a low-viscosity liquid such as methanol, which does not degrade fiber properties, in a ratio of approximately 1/2% fibers by weight. This slurry is fed into a Fourdrinier type head box 10 as used for paper making from which it flows onto continuous screen 12. As the slurry flows from box 10, the fibers are aligned parallel to the direction of flow by a series of vanes 14. The alignment is maintained by belts 16 which move in unison with screen 12.

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Method of Aligning Discontinuous Fibers

Tapes reinforced with discontinuous unidirectionally aligned fibers can be generated using a Fourdrinier type machine. Continuous reinforcing fibers, such as glass, graphite or mullite are cut to a required length as dictated by process and property requirements. The lengths are normally 1/4 to 1 inch. The cut fibers are slurried in a low-viscosity liquid such as methanol, which does not degrade fiber properties, in a ratio of approximately 1/2% fibers by weight. This slurry is fed into a Fourdrinier type head box 10 as used for paper making from which it flows onto continuous screen 12. As the slurry flows from box 10, the fibers are aligned parallel to the direction of flow by a series of vanes 14. The alignment is maintained by belts 16 which move in unison with screen 12. The carrying liquid drains through screen 12 to be filtered and recycled. The aligned fibers are dried by moving the continuous screen over vacuum boxes 18. The fibers are finally sprayed with a solution containing resin and a curing agent. The process can also be carried out by placing all or a portion of the resin in the initial slurry.

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