Method for screen printing of paste

Details Method for screen printing of paste Method for screen printing of paste

1993-07-26

1994-05-10

Burr, Edgar S.

Printing

Cleaning attachments

101129, B41F 3500

Patent

active

053098374

ABSTRACT:
A method for printing solder paste onto a surface of a printed circuit board through the medium of a screen having openings. The method includes feeding the paste into a chamber of a dispenser, dispensing the paste contained in the chamber onto a first side of the screen and onto the surface of the board from the dispenser through a slit-like aperture, removing paste residue from the first side of the screen by a blade extending from a first cleaning apparatus, removing paste residue from a second side of the screen by another blade extending from a second cleaning apparatus, and sucking and transporting the paste residue adhered to inner peripheral surfaces of openings in the screen as well as the paste residue being removed from the second side of the screen by a vacuum device connected to the second cleaning apparatus. The slit-like aperture of the dispenser is formed by a fixed front wall and a moveable rear wall selectively moving toward and away from the fixed front wall.

REFERENCES:
patent: 762165 (1904-06-01), Hainey
patent: 2027102 (1936-01-01), Hommel et al.
patent: 3986450 (1976-10-01), Zimmer
patent: 4433623 (1984-02-01), Beckim
patent: 5070782 (1991-12-01), Sakai et al.

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