Optimizing Time/Pressure Dispensing of Adhesives by Chrys Shea Over the past decade, depositing adhesives for SMT components on the solder side of a circuit board has seen more dramatic changes than any other production process. It's gone from pin transfer, to screening, to time/pressure dispensing, to positive displacement pumps. These changes have not been in the vein of typical process evolutions where experience and experiments give way to refinements and improvements. This process evolution has encountered complete conceptual changes in the approach to get a repeatable, reliable glue dot.
Everyone in the industry will agree that time/pressure systems are not the best way to form adhesive deposits. Some organizations can justify the capital expense of positive displacement pump equipment, while others have returned to screening adhesives with a more refined process than in years past. But many assemblers have time/pressure systems on their shop floor, and no choice but to use them to the best of their capability. Understanding the mechanics of the process can help the effort to optimize this less-than-perfect process, however.
Faster Server Introduced June 1, 1999 The rapid growth of our site traffic demanded a faster server. Response time has improved.
Updated PCBCE Mart The PCB Capital Equipment Mart will now feature a shopping cart for buying "For Sale" listings. Listings may be purchased individually or as an unlimited 3-month pass. All members will continue to post for free to the "Blue Book" and "Wanted" sections. New members will receive one free listing in the "For Sale" section upon completing registration. In addition, 3-month pass holders will be featured in a special section of the Mart.
Forum Thread Archives Did you ever wonder what happens to an old thread in the SMT Forum when someone posts a new follow-up to it? How can you know about it without searching through all of the Forum Archives? Well, we have provided a solution. There is a new sorting option in the Forum called "List Thread by Update Date". This sorts the entire Forum history by most recently active thread. You can find it in the drop-down menu at the top of the SMT Forum.
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