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Browse Prior Art Database

MECHANICAL PC BOARD HOLDER WITH SPRAY DIRECTORS FOR USE IN IPA STENCIL CLEANERS

IP.com Disclosure Number: IPCOM000007729D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-17
Document File: 3 page(s) / 92K

Publishing Venue

Motorola

Related People

Michael Zak: AUTHOR [+3]

Abstract

Government restrictions of CFC solvents has pushed the electronics industry towards "no-clean" surface-mount manufacturing. The benefits of "no-clean" processing are being realized in reduced manufacturing costs. The cost of cleaning equipment, chemicals, and labor are eliminated. Problems associated with the use and disposal of environ- mentally hazardous chemicals are also eliminated. This evolution has pushed many manufacturers towards "no-clean" rosin-based solder pastes.

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Technical Developments

MECHANICAL PC BOARD HOLDER WITH SPRAY DIRECTORS FOR USE IN IPA STENCIL CLEANERS

by Michael Zak, Hank Liebman and Steve Knitter

BACKGROUND

  Government restrictions of CFC solvents has pushed the electronics industry towards "no-clean" surface-mount manufacturing. The benefits of "no-clean" processing are being realized in reduced manufacturing costs. The cost of cleaning equipment, chemicals, and labor are eliminated. Problems associated with the use and disposal of environ- mentally hazardous chemicals are also eliminated. This evolution has pushed many manufacturers towards "no-clean" rosin-based solder pastes.

ing smaller, more versatile cleaners. Today's clean- ers use saponitiers, surfactants and terpenes with deionized water rinse baths to clean solder and flux and remove residual cleaning agents. These systems are otten very large, costly and require special chem- ical handling.

  A simple cleaning agent alternative is isopropyl alcohol (IPA). IPA cleaning leaves almost no resi- due on the PC board, requires no deionized water rinse, and is easier to dispose of than terpene or saponified waste. There are only a few IPA cleaners on the market today that,offer the flexibility to clean both PC boards and stencils as delivered.

CURRENT SITUATION

  The use of "no-clean" rosin-based solder pastes has reduced but not completely eliminated the need for cleaning PC boards. Screen printing misprints, mishandled boards and contamination are all rea-...