Method and apparatus for infection molding brushes

Details Method and apparatus for infection molding brushes Method and apparatus for infection molding brushes

1981-09-23

1983-12-27

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

249129, 249160, 264243, 264334, 425444, 425805, B28B 704

Patent

active

044229860

ABSTRACT:
The injection molding of brushes, particularly miniature brushes such as for the application of cosmetics, is carried out in a mold in which each of the cavities defining the bristles is defined by a plain surface of one mold piece and a grooved surface of another mold piece. The mold pieces are clamped together and a brush is formed by injection molding. An ejector rod facilitates removal of the molded brush from the mold, thus making it unnecessary to separate the mold pieces to remove the molded brush. However, the mold pieces may be unclamped and separated to allow the mold to be cleaned of foreign matter or broken bristles.

REFERENCES:
patent: 3357058 (1967-12-01), Kutik

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