Method of making agglomerate of whiskers or short fibers

Details Method of making agglomerate of whiskers or short fibers Method of making agglomerate of whiskers or short fibers

1992-10-29

1993-12-14

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Agitating to form larger particles

23313R, 23313P, B29B 908

Patent

active

052699935

ABSTRACT:
Whiskers having a diameter of 0.1-10 .mu.m and a length of 5-200 .mu.m are pelletized and granulated into agglomerates which have a size of 0.1-10 mm and a bulk density of 0.2-1.0 kg/liter.
To pelletize, powders of whiskers are moistened with water while mixing to form primary aggregates. Then, the powders and the primary aggregates are subjected to a rolling movement to cause the primary aggregates to grow into secondary aggregates having desired size distribution. Finally, the secondary aggregates are dried to obtain pelletized or granulated agglomerates of whiskers.
Handling of whiskers is facilitated because the agglomerates are less bulky and less likely to fly up in the air. When blended into molding materials for fiber reinforcement, however, the agglomerates are readily disintegrated back into separated individual fibers to provide homogeneous dispersion.

REFERENCES:
patent: 3228115 (1968-01-01), Swanson et al.
patent: 3264069 (1966-08-01), Getty
patent: 3832434 (1974-08-01), Flood et al.
patent: 3904726 (1975-09-01), Jacquelin et al.
patent: 4157371 (1979-06-01), Paulson et al.
patent: 4670181 (1987-06-01), Mollinger et al.

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