Apparatus for the application of colorant to polymeric surface

Details Apparatus for the application of colorant to polymeric surface Apparatus for the application of colorant to polymeric surface

1976-03-29

1977-07-19

Jaudon, Henry S.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Electrostatic and/or electromagnetic attraction or...

118657, B05C 502

Patent

active

040361748

ABSTRACT:
The apparatus for applying a stripe of colorant to a polymeric surface includes a spring biased, rotatably mounted circular magnet having a predetermined width. Non-magnetic walls extend radially outwardly from the magnet and are biased against the polymeric material. A retainer for holding a mixture of a ferro-magnetic carrier and a non-magnetic colorant is located within the magnetic field of the circular magnet. A rotatably supported roller on the side of the polymeric surface opposite the magnet supports the polymeric surface as it moves.
The process of applying a stripe of polymeric colorant to an embossed electrically uncharged polymeric surface including rotating a wheel-shaped magnet, attracting a mixture of ferro-magnetic material acting as a carrier for a polymeric colorant to the magnet and pressing the magnet with the mixture against the polymeric surface. The mixture is placed on the polymeric surface with sufficient pressure so that it is initially held on the polymeric surface by triboelectricity. The process also includes means of outlining the edges of the stripe comprising non-magnetic walls disposed on both sides of the rotating magnet. A protective coating is subsequently applied over the polymeric surface, the colorant.

REFERENCES:
patent: 2786440 (1957-03-01), Giaimo
patent: 3812780 (1974-05-01), Borelli
patent: 3872826 (1975-03-01), Hanson

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