VGB-450 Daheng Under vacuum potting system By potting under vacuum, components can be optimally protected from external influences. Before the potting process, air and moisture are removed from the components by vacuum. Components with geometries th
New Equipment | Cleaning Equipment
STENCIL / MISPRINT / PCB DE-FLUXING All IN 1 SYSTEM The X-Series system is designed around counter-rotating spray bars featuring fan jet sprays. The added pressure allows the system to successfully clean small pitch stencils, low stand-off compone
Electronics Forum | Thu Jun 07 05:11:42 EDT 2012 | cp38260
Hi, I have pcbs (Duroid/RT 5880) with raw copper, soldered in vapour-phase chamber at 230 degrees Celsius. During soldering, copper gets tarnished. Cleaning with Vigon A250 removes the tarnished layer. Indeed, in the VigonA250 techn. datasheet it is
Electronics Forum | Mon Jul 26 14:14:51 EDT 1999 | Steve Gregory
| | | We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. | | | The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is th
Used SMT Equipment | Pick and Place/Feeders
FUJI SMT machine AIMEX IIIC-Flexible High-Mix Production Freeing up more floor space with its compact design and reduced lengthThis is an all-in-on machine with scalability and the ultimate level of versatility necessary for increasing productivity f
Used SMT Equipment | Pick and Place/Feeders
FUJI SMT machine AIMEX IIIC-Flexible High-Mix Production Freeing up more floor space with its compact design and reduced lengthThis is an all-in-on machine with scalability and the ultimate level of versatility necessary for increasing productivity f
Industry News | 2003-04-30 08:51:08.0
Electrolube played the role of environmental champion in Australia recently.
Industry News | 2021-05-25 12:56:56.0
The SMTA Officer team is excited to provide our members with a free technical webinar on "The Relationship Between Cleanliness and Reliability/Durability" by Debbie Carboni, Global Product Manager at KYZEN Corporation. The presentation will take place on June 10th at 11:00am EST and include:
Parts & Supplies | Pick and Place/Feeders
SMT basic process components include: silk screen (or dispensing), placement (curing), reflow soldering, cleaning, testing, repair 1, silk screen: its role is to paste or patch solder paste printed on the PCB pad, the components f
Parts & Supplies | Pick and Place/Feeders
The definition of SMT SMT is the surface assembly technology,surface mount technology(surface mount technology)(Surface Mounted Technology abbreviation),is currently the most popular electronic assembly industry,a technology and technology. What a
Technical Library | 2013-04-11 15:43:17.0
With the explosion of growth in handheld electronics devices, manufacturers have been forced to look for ways to reinforce their assemblies against the inevitable bumps and drops that their products experience in the field. One method of reinforcement has been the utilization of underfills to "glue" certain SMDs to the PCB. Bumped SMDs attached to the PCB with a no-clean soldering process offer the unavoidable scenario of the underfill coming in contact with a flux residue. This may or may not create a reliability issue... First published in the 2012 IPC APEX EXPO technical conference proceedings
Technical Library | 2020-08-27 01:22:45.0
Initially adopted internal specifications for acceptance of printed circuit boards (PCBs) used for wire bonding was that there were no nodules or scratches allowed on the wirebond pads when inspected under 20X magnification. The nodules and scratches were not defined by measurable dimensions and were considered to be unacceptable if there was any sign of a visual blemish on wire-bondable features. Analysis of the yield at a PCB manufacturer monitored monthly for over two years indicated that the target yield could not be achieved, and the main reasons for yield loss were due to nodules and scratches on the wirebonding pads. The PCB manufacturer attempted to eliminate nodules and scratches. First, a light-scrubbing step was added after electroless copper plating to remove any co-deposited fine particles that acted as a seed for nodules at the time of copper plating. Then, the electrolytic copper plating tank was emptied, fully cleaned, and filtered to eliminate the possibility of co-deposited particles in the electroplating process. Both actions greatly reduced the density of the nodules but did not fully eliminate them. Even though there was only one nodule on any wire-bonding pad, the board was still considered a reject. To reduce scratches on wirebonding pads, the PCB manufacturer utilized foam trays after routing the boards so that they did not make direct contact with other boards. This action significantly reduced the scratches on wire-bonding pads, even though some isolated scratches still appeared from time to time, which caused the boards to be rejected. Even with these significant improvements, the target yield remained unachievable. Another approach was then taken to consider if wire bonding could be successfully performed over nodules and scratches and if there was a dimensional threshold where wire bonding could be successful. A gold ball bonding process called either stand-off-stitch bonding (SSB) or ball-stitch-on-ball bonding (BSOB) was used to determine the effects of nodules and scratches on wire bonds. The dimension of nodules, including height, and the size of scratches, including width, were measured before wire bonding. Wire bonding was then performed directly on various sizes of nodules and scratches on the bonding pad, and the evaluation of wire bonds was conducted using wire pull tests before and after reliability testing. Based on the results of the wire-bonding evaluation, the internal specification for nodules and scratches for wirebondable PCBs was modified to allow nodules and scratches with a certain height and a width limitation compared to initially adopted internal specifications of no nodules and no scratches. Such an approach resulted in improved yield at the PCB manufacturer.
Flux spray coating on a PCB with uniformal thickness down to 5 microns, with clear edge definition and minimal overspray. Can coat large or shoot dots with the same jet.
https://www.ascen.ltd/Products/conformal_coating_equipment//579.html PCB conformal coating machine selective coating process for PCBA, PCB coating machine protective coating,to protect the sensitive components: from external environmental factors,vib
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---> SMT Express, Volume 3, Issue No. 6 - from SMTnet.com Volume 3, Issue No. 6 Friday, June 15, 2001 Featured Article Return to Front Page PCB Assembly Techniques by Harvey Twyman , University of Kent at Canterbury "I'm sure you
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residue is completely water soluble! Share 0 Share on Facebook Tweet Tweet on Twitter Pin it 0 Pin on Pinterest Fancy Add to Fancy +1 +1 on Google Plus Latest News Introducing our New Model RW-SV2000A BGA Rework Station Precision PCB Services, Inc
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