Application of primer coating

Abstract

A system for applying a uniform band of liquid primer material to the marginal edge surfaces of glazing units upon which a plastic frame or gasket member is to be molded in place. A family of interchangeable applicator tips is provided for use with a dispensing device adapted to provide an on-demand supply of primer material to the tip in use. The different applicator tips of the family have configurations particularly adapted to applying bands of primer material along selected peripheral margins of a sheet member. Each is of a composite construction including a relatively rigid base member covered by a soft absorbent body for contacting and transferring to the sheet surface the layer of primer material. The tips are readily attachable to and removable from the primer material dispensing device. The dispensing device may comprise one or more applicator guns incorporated in a modular work station, including a closed storage and supply container for the primer material and a solvent flush system for cleaning hoses and flow guns of the reactive priming resins. The flow guns may be mounted upon an oscillating carriage whereby, in one position of the carriage, spent applicator tips are removed and replaced by new tips by a suitably programmed robot, and in another position the marginal edges of sheet members are moved along and through the applicator tips by a suitably programmed robot arm for application of a band of the primer material.