Process and apparatus for the coating of boards

H - Electricity – 05 – K

Patent

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Details

H05K 3/00 (2006.01) B05C 5/00 (2006.01) G03F 7/16 (2006.01)

Patent

CA 2275629

In a process for the coating of boards (4) with a poured material (L), especially for the coating of printed circuit boards with, for example, solder resist, the boards (4) to be coated are transported through and beneath a curtain of poured material descending transversely to the transport direction and the poured material descending in the form of a pouring curtain (LV) thus falls onto the boards (4). The descending pouring curtain (LV) falls onto a planar deflector surface (20) before falling onto the board (4), with an acute angle (.alpha.) being formed between the deflector surface (20) and the plane of the pouring curtain (LV), which deflector surface (20) has a cut-off edge (21) at its lower end. After falling onto the deflector surface (20), the poured material runs along that deflector surface (20) downwards towards the cut-off edge (21) and then descends onto the board (4).

Dans un procédé de revêtement de plaques (4) au moyen d'un matériau coulé (L), en particulier pour le revêtement de plaquettes de circuits imprimés au moyen, par exemple, d'un agent de réserve, les plaques (4) destinées à être revêtues sont transportées à travers et sous un rideau de matériau coulé tombant transversalement par rapport à la direction de transport, si bien que le matériau versé tombant sous forme d'un rideau de coulage (LV) tombe sur les plaques (4). Avant de tomber sur la plaque (4), le rideau de coulage descendant (LV) tombe sur une surface déflectrice plane (20), un angle aigu (.alpha.) étant formé entre la surface déflectrice (20) et le plan du rideau descendant (LV), ladite surface présentant une arête tranchante (21) au niveau de son extrémité inférieure. Après être tombé sur la surface déflectrice (20), le matériau coulé se répand sur la surface déflectrice (20), vers le bas, en direction de l'arête tranchante (21) pour tomber ensuite sur la plaque (4).

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