Electronics Forum | Wed Feb 01 10:13:39 EST 2006 | kmorris
I haven't seen a hydrometer used in years. Are > you still foam fluxing? There used to be > automatic units available, but with the advent of > the spray fluxer, they may have dried up. If you > are still foam fluxing with alcohol thinner, >
Electronics Forum | Mon Dec 18 12:06:15 EST 2006 | realchunks
Always check your specific gravity. It directly affects your faoming. Put ping pong balls in your fluxer to reduce your thinner from evaporating.
Industry News | 2001-08-01 16:12:28.0
PCI bus-based Machine Vision Board Provides High Performance
Industry News | 2001-08-01 16:25:13.0
Machine Vision Software Adds Sophisticated Suite of OCR and Bar Code Tools
Technical Library | 2021-06-10 08:08:19.0
test equipment /FPC universal
Technical Library | 2019-09-19 00:28:48.0
The symbiotic relationship between solder masks and selective finishes is not new. The soldermask application is one of the key considerations to ensure a successful application of a selective finish. The selective finish is the final chemical step of the PCB manufacturing process, this is when the panels are at their most valuable and are unfortunately not re-workable. Imperfections are not tolerated, even if they are wholly cosmetic. Quality issues often manifest themselves in the form of a 'ping pong' conversation between the fabricators, the soldermask suppliers and the selective finish suppliers. Without tangible evidence these discussions are difficult to resolve and the selective finish process is usually regarded as responsible. This paper will focus on the chemical characteristics and use them to predict or identify potential issues before they occur rather than specifically name 'critical' soldermasks. It is also the intention of this paper to address the potential of a soldermask to react to common yield hiking practices like UV bumping and oven curing. It is hoped that this awareness will help fabricators to ensure maximum yields by asking the right questions. 'Critical’ soldermasks impact all selective finishes. In this paper, practical experience using immersion tin will be used to highlight the relationship between 'critical' soldermasks and some of the issues seen in the field. The paper will include a novel approach to identify re-deposited volatiles after the reflow.
1st Place Machinery Inc. | http://www.firstplacemachinery.com/firstplace_exatron_laser_etcher.html
. Pickup heads can carry 1 to 16 devices at a time. Ping pong operation can move devices to two tester, each with multiple test sockets
