Process for application of powder particles to filamentary mater

Details Process for application of powder particles to filamentary mater Process for application of powder particles to filamentary mater

1990-05-16

1991-10-15

Beck, Shrive

Coating processes

Solid particles or fibers applied

Fluidized bed utilized

427195, 427375, 118DIG5, 156166, 156283, B05D 124

Patent

active

050573381

ABSTRACT:
This invention is a process for the uniform application of polymer powder particles to a filamentary material in a continuous manner to form a uniform composite prepreg material. A tow of the filamentary material is fed under carefully controlled tension into a spreading unit, where it is spread pneumatically into an even band. The spread filamentary tow is then coated with polymer particles from a fluidized bed, after which the coated filamentary tow is fused before take-up on a package for subsequent utilization. This process produces a composite prepreg uniformly without imposing severe stress on the filamentary material, and without requiring long, high temperature residence times for the polymer.

REFERENCES:
patent: 3742106 (1973-06-01), Price
patent: 3862287 (1975-01-01), Davis
patent: 4243699 (1981-01-01), Gibson
patent: 4614678 (1986-09-01), Ganga
patent: 4799985 (1989-01-01), McMahon et al.

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