Browse Prior Art Database

WAVE SOLDER PARTS SHIELD FOR NITROGEN BLANKETED SYSTEMS

IP.com Disclosure Number: IPCOM000007001D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-15
Document File: 1 page(s) / 61K

Publishing Venue

Motorola

Related People

Hank F. Liebman: AUTHOR [+3]

Abstract

Wave solder systems without nitrogen blanket- ing do not have "curtains:' thus parts "knock over" problems associated with curtains will not exist for these systems. When nitrogen retrofits were intro- duced into wave solder applications, curtains were absolutely required to entrap the nitrogen gas over the wave, as < 10 PPM levels were required to accom- plish our goal ofvirtually no solder dross.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 61% of the total text.

Page 1 of 1

0 M MO-LA

INC. Technical Developments Volume 20 October 1993

WAVE SOLDER PARTS SHIELD FOR NITROGEN BLANKETED SYSTEMS

by Hank F. Liebman, Jose M. Fornander and Richard E. Watson

  Wave solder systems without nitrogen blanket- ing do not have "curtains:' thus parts "knock over" problems associated with curtains will not exist for these systems. When nitrogen retrofits were intro- duced into wave solder applications, curtains were absolutely required to entrap the nitrogen gas over the wave, as < 10 PPM levels were required to accom- plish our goal ofvirtually no solder dross.

  Nitrogen blanketing for these "exposed" wave solder systems, typically Hollis and Electrovert prod- uct lines, is still a new and growing technology. They contain curtains. There are wave solder machines that are totally enclosed to accomplish blanketing, and have been available for some time. Totally enclosed machines do not need curtains, but their cost is high, and their size is very large, making these systems a very costly and space consuming choice if you want to go to nitrogen, thus the retro- fit. There was a significant problem defining what the curtain technique should be. Various hard cur- tains were tried, but they allowed the nitrogen to escape when the product entered the wave, and were demonstrated to be not acceptable for blanketing.

With curtains quality levels were as good, but no better than non blanketing, due to some parts being knocked over by the curtains. The new nitrogen...