Electrostatic application of thermoplastic adhesive

Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board

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118624, 118638, 239 3, 427 27, 427 32, B05D 106

Patent

active

039795292

ABSTRACT:
Apparatus is provided for applying a well-defined strip of thermoplastic adhesive in powder form to a substrate. Powdered adhesive material is received from a hopper supply into compartments arranged around the periphery of a rotatable transporter wheel. The wheel, by rotation, carries the adhesive to a delivery station where, owing to the presence of a strong electrostatic field between the wheel and an electrode, the adhesive is drawn from the wheel compartments and onto the substrate, to which it adheres. The substrate is moved through the apparatus at an appropriate speed, in comparison with that of rotation of the wheel, such that a continuous uniform strip of adhesive is applied to the substrate.

REFERENCES:
patent: 2128907 (1938-09-01), Benner et al.
patent: 3329125 (1967-07-01), Grossteinbeck et al.
patent: 3513810 (1970-05-01), Jackson

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