Browse Prior Art Database

Cleaning of Boards After the Application of a Solder Mask

IP.com Disclosure Number: IPCOM000042051D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bonafino, EJ: AUTHOR [+3]

Abstract

In the manufacture of printed circuit boards a photosensitive solder mask is applied to the surface of the boards prior to passing the boards through a solder operation. One such commercially available solder mask is VACREL*. Photosensitive solder masks are exposed and developed after they are applied. The areas of the board which are exposed by the developing operation must be cleaned prior to the soldering operation. It has been found that the following sequence of steps results in a high degree of reliability from the solder operation: a. vapor blast b. chemical clean c. repeat vapor blast with board rotated 180 degrees It is noted that the vapor blast operation roughens the surface of the photosensitive dielectric, thereby enhancing and facilitating outgassing from the photosensitive dielectric.

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Cleaning of Boards After the Application of a Solder Mask

In the manufacture of printed circuit boards a photosensitive solder mask is applied to the surface of the boards prior to passing the boards through a solder operation. One such commercially available solder mask is VACREL*. Photosensitive solder masks are exposed and developed after they are applied. The areas of the board which are exposed by the developing operation must be cleaned prior to the soldering operation. It has been found that the following sequence of steps results in a high degree of reliability from the solder operation:
a. vapor blast b. chemical clean c. repeat vapor blast with board rotated 180 degrees It is noted that the vapor blast operation roughens the surface of the photosensitive dielectric, thereby enhancing and facilitating outgassing from the photosensitive dielectric. If this outgassing occurs during the solder operation, it will interfere with effecting a reliable solder process. The vapor blasting insures that the outgassing occurs prior to the solder operation. * Trademark of E. I. du Pont de Nemours & Co.

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