International Standard Electric Corporation

Camiel D Cleemput

Hedwig L Coussement

A process for providing through plated holes in a substrate by screen printing provides uniformly thick plating of the holes. One side of the substrate is screen plated while being subjected to an underpressure between 10 and 200 gr/cm.sup.2 from a chamber fed by a large volume vacuum vat. When treating the other side of the substrate, vacuum may be increased up to 2.5 times the first underpressure.

Screen printing process and apparatus and electrical printed circuits

A screen printing device including a work table having a printing position with a holder to retain a substrate in the printing position, a holder for a screen provided with a mask, the mask having referenced portions, a microscope, an adjuster for positioning the table, screen holder and microscope, and further includes a template with reference portions corresponding to the reference portions of the mask, the work table having at least one hole with associated illumination means to simultaneously illuminate the corresponding reference portions of the mask and of the template held in the printing position by the holder in order to be able to adjust, with the help of the adjuster, the relative position of the reference portions of the template and the reference portions of the mask when viewed through the microscope.

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Wondelgem - Gent, Belgium

Camiel D Cleemput