Method for determining quality of dispersion of glass fibers in

Details Method for determining quality of dispersion of glass fibers in Method for determining quality of dispersion of glass fibers in

1992-12-22

1995-07-25

Mancuso, Joseph

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Manufacturing or product inspection

356 36, G06K 900

Patent

active

054369800

ABSTRACT:
A method for determining the quality of dispersion of glass fibers in a thermoplastic resin preform layer compares the mean characteristic length of the glass fiber bundles in the preform layer to a predetermined value indicative of dispersion of the glass fibers. The thermoplastic resin preform layer characterized by this method comprises a plurality of individual glass fibers and some degree of undispersed glass fiber bundles intimately mixed with a plurality of discrete thermoplastic fibers. The glass fibers are introduced to the mixture having a length of about 1 cm. to about 8 cm. After mixing, some of the glass fiber bundles break up, and some residual glass fiber bundles remain. A preform layer which has acceptable dispersion has residual glass fiber bundles having a mean apparent length of less about 1.365 mm.

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Unexamined Japanese Patent Application No. 63-67551, Mar. 26, 1988.

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