Electronics Forum | Wed Apr 10 22:35:59 EDT 2002 | davef
How do you assure you "have squeegee pressure and speed controlled"? Search the fine SMTnet Archives for background on measuring paste thickness.
Electronics Forum | Fri Nov 08 17:49:04 EST 2002 | davef
Questions are: * So, what is your thinking on this "insufficient contact causing intermitten failures"? * How do you print the paste? * Where do you place your therocouples when measuring reflow temperature? * What kind of solderability protection is
Used SMT Equipment | SPI / Solder Paste Inspection
Solder paste thickness detector Measurement software: MC-110-2.5D video observation, image storage, thickness measurement, data recording, background light, laser brightness control, area (square Shape, irregular polygon, circle) / volume / spacin
Used SMT Equipment | SPI / Solder Paste Inspection
KOH YONG/SPI KY8030 2XL MACHINE KY8030-2XL MC-110-2.5D video observation, image storage, thickness measurement, data recording, background light, laser brightness control, area (square, irregular polygon, circle)/volume/spacing (X, Y axis)/angle
Industry News | 2022-04-28 14:30:28.0
Koh Young Technology, the industry leader in True 3D measurement-based inspection solutions, will highlight an array of award-winning inspection and measurement solutions at SMTconnnect in booth 4.A-233 on the NürnbergMesse event grounds during 10-12 May 2022. The following is just a glimpse into what Koh Young will have in store for our visitors at the tradeshow:
Industry News | 2021-08-09 09:34:59.0
Atlanta, Georgia – In support of the SMTA and its local chapters, Koh Young America will be supporting the Ohio Valley Expo & Tech Forum Wednesday, August 25th at the Holiday Inn in Strongsville, Ohio. Based on its award-winning portfolio of inspection and smart factory solutions, Koh Young will highlight its solder paste inspection (SPI) and automated optical inspection (AOI) processes.
Technical Library | 2017-07-06 15:50:17.0
Head-in-pillow (HiP) is a BGA defect which happens when solder balls and paste can't contact well during reflow soldering. Package warpage was one of the major reasons for HiP formation. In this paper, package warpage was measured and simulated. It was found that the package warpage was sensitive to the thickness of inside chips. A FEM method considering viscoelastic property of mold compound was introduced to simulate package warpage. The CTE mismatch was found contributes to more than 90% of the package warpage value when reflowing at the peak temperature. A method was introduced to measure the warpage threshold, which is the smallest warpage value that may lead to HiP. The results in different atmospheres showed that the warpage threshold was 50μm larger in N2 than that in air, suggesting that under N2 atmosphere the process window for HiP defects was larger than that under air, which agreed with the experiments.
Technical Library | 2023-08-04 15:27:30.0
A designed experiment evaluated the influence of several variables on appearance and strength of Pb-free solder joints. Components, with leads finished with nickel-palladium-gold (NiPdAu), were used from Texas Instruments (TI) and two other integrated circuit suppliers. Pb-free solder paste used was tin-silver-copper (SnAgCu) alloy. Variables were printed wiring board (PWB) pad size/stencil aperture (the pad finish was consistent; electrolysis Ni/immersion Au), reflow atmosphere, reflow temperature, Pd thickness in the NiPdAu finish, and thermal aging. Height of solder wetting to component lead sides was measured for both ceramic plate and PWB soldering. A third response was solder joint strength; a "lead pull" test determined the maximum force needed to pull the component lead from the PWB. This paper presents a statistical analysis of the designed experiment. Reflow atmosphere and pad size/stencil aperture have the greatest contribution to the height of lead side wetting. Reflow temperature, palladium thickness, and preconditioning had very little impact on side-wetting height. For lead pull, variance in the data was relatively small and the factors tested had little impact.
Effects of reflow profile and thermal conditioning on intermetallic compound thickness for SnAgCu soldered joints. Effects of reflow profile and thermal conditioning on intermetallic compound thickness for SnAgCu soldered joints. The purpose
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/when-should-a-pad-use-windowpane-paste-mask_topic2600_post10599.html
. Let's say you use a 0.125 mm (5 mil) stencil thickness. If you have a thermal pad that has 100% paste mask coverage, there is no where for the solder to flow and the package ends up sitting on top of
KingFei SMT Tech | https://www.smtspare-parts.com/quality-11936650-220v-50-60hz-solder-paste-inspection-table-top-3d-spi-7500-vision-ce
scan type which is able to measure and analyze the small-sized object image and the print image of Solder Paste as well. In particular, it is a on-board type one suitable for controlling the screen print process optimally by measuring and analyzing the solder cream coated after screen print in 3D and is also optimal of
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