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RECIRCULATING SQUEEGEE FOR THE AUTOMATED SOLDER PRINTING PROCESS

IP.com Disclosure Number: IPCOM000006531D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2002-Jan-11
Document File: 1 page(s) / 48K

Publishing Venue

Motorola

Related People

Jonathon Greenwood: AUTHOR [+2]

Abstract

The art of solder printing is continually being ret&d. paste being discarded. The recirculating action associated In an effort to reduce solder paste tack loss, excessive with the squeegees also keeps the paste at a uniform paste consumption and simplify the clean-up, the viscosity for printing. Figure 1 shows the recirculating Recirculating Squeegee was developed. squeegee assembly.

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MOTOROLA INC. Technical Developments Volume 16 August 1662

RECIRCULATING SQUEEGEE FOR THE AUTOMATED SOLDER PRINTING PROCESS

by Jonathon Greenwood and John Cheraso

  The art of solder printing is continually being ret&d. paste being discarded. The recirculating action associated In an effort to reduce solder paste tack loss, excessive with the squeegees also keeps the paste at a uniform paste consumption and simplify the clean-up, the viscosity for printing. Figure 1 shows the recirculating Recirculating Squeegee was developed. squeegee assembly.

  With the elimination of freon throughout Motorola Figure 2 shows the assembly with paste on a sten- more factories are switching to the no clean process. cil. As the blade traverses across the stencil the paste at One drawback associated with the nq clean process is the outer edges ofblade is folded in towards the center. the decreased tack life of the paste. This device elimi-
nates the solder dam rails on the stencil by keeping the The recirculator can be fabricated from sheet metal paste on the stencil confined to the width of the metal and combined with an existing metal blade. The blade. Keeping the paste cotimed to the printing path recirculator and blade are attached directly to.the squee- reduces the need for excessive amounts of paste on the gee clamp of the printer.
stencil, mean time between assist and the amount of

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0 Motorola, 1°C. 1992 75

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