Technical Library | 2019-07-02 23:02:05.0
The introduction of lead-free solders resulted in a selection of different chemistries for solder pastes. The higher melting points of lead-free alloys required thermal heat resistant rosin systems and activators that are active at elevated temperatures. As a result, more frequent maintenance of the filtration systems is required and machine downtime is increased.Last year a different method of cleaning reflow ovens was introduced. Instead of cooling down the process gasses to condensate the residues, a catalyst was used to maintain the clean oven. Catalytic thermal oxidation of residues in the nitrogen atmosphere resulted in cleaner heating zones. The residues were transformed into carbon dioxide. This remaining small amount of char was collected in the catalyst. In air ovens the catalyst was not seen as a beneficial option because the air extracted out of the oven was immediately exhausted into the environment. When a catalyst is used in an air environment there is not only the carbon dioxide residues, but also water. When a catalyst is used in an air reflow oven the question is where the water is going to. Will it condensate in the process part of the oven or is the gas temperature high enough to keep it out of the process area? A major benefit of using a catalyst to clean the air before it is exhausted into the environment is that the air pollution is reduced dramatically. This will make environmental engineers happy and result in less pollution of our nature. Apart from this, the exhaust tubes remain clean which reduces the maintenance of air ovens.This paper will give more detailed information of catalyst systems during development and performance in production lines.
Industry News | 2018-10-18 11:13:35.0
PCB Outline Layer And Keep-out Polygon Clearance
Originally established since 1987, we've been an innovator of efficiency in the garment and textile industry, exporting products to Europe, Russia, North America and the Middle East etc.
Industry Directory | Consultant / Service Provider
PCB assembly services, both US and offshore. We handle basic through-hole to standard surface mount to ultra-fine pitch. Quote and order PCB fabrication and assembly online.
Technical Library | 2013-11-07 00:38:09.0
Today’s customers are more enlightened and aware demanding quality and compact electronics products at competitive prices. Today when a single word spreads out so quickly, no company can afford to put their reputation at stake by manufacturing substandard products.
Industry News | 2019-07-16 19:49:23.0
PVA will exhibit at the SMTA Ohio Expo & Tech Forum, scheduled to take place Thursday, Aug. 8, 2019 at the Holiday Inn Cleveland Strongsville. Company representatives will highlight the SJ100 non-contact jet valve for selectively applying conformal coatings onto substrates with close keep-out tolerances.
Industry News | 2018-07-17 13:56:31.0
Tiny RF chip antennas are no longer relegated to PCB “keep out” area, allowing product designers to further miniaturize wireless biosensors and medical wearables
Left: This part looked ok to the naked eye. Right: A microscopic view shows evidence of this part being previously soldered or reworked. Another part caught and prevented from being a potential problem for our customer. Decapsulation, Pinpri
Career Center | Brookfield, Wisconsin USA | Engineering
MANUFACTURING ENGINEER, SMT ELECTRONICS -- $45,000 to $55,000 + O.T. Company: Well established and very profitable division of a Fortune 500 Company that is manufacturing a wide variety of automotive aftermarket products. They have seen steady gro
Technical Library | 1999-06-23 20:29:21.0
This paper outlines the harmful effects of out-of-control process parameters and describes methods of measuring and tracking them to keep them in control. It addresses all critical variables of wave soldering: flux deposition, preheat application, conveyor speed, solder temperature and solder contact time.
