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
Electronics Forum | Tue May 02 13:07:55 EDT 2006 | Jbrower
Howdy all. The question that I have is on wave solder pallets. I'm getting quite a bit of flux trapped on the pcb where it contacts the wave solder pallet. I have an appropriate profile for my assemblies, The flux that i use is Kester 920-CXF No Cl
Industry News | 2012-11-02 09:04:14.0
IPC and SMTA jointly announce the agenda for Session 5 of the High-Reliability Cleaning and Coating Conference, scheduled to take place November 13-15, 2012 at the Crowne Plaza Hotel – O’Hare in Chicago, IL.
Industry News | 2013-10-02 23:40:56.0
Ascentech LLC will exhibit the Gensonic UltraSonic Stencil Cleaner and the new Solder Saver at the upcoming SMTA International 2013. The Gensonic is a manually-operated, ultrasonic transducer unit for cleaning stencils used in printing solder pastes and adhesives. It can be used either directly on the printer or at a separate cleaning station.
Technical Library | 2019-08-14 22:20:55.0
Cleanliness is a product of design, including component density, standoff height and the cleaning equipment’s ability to deliver the cleaning agent to the source of residue. The presence of manufacturing process soil, such as flux residue, incompletely activated flux, incompletely cured solder masks, debris from handling and processing fixtures, and incomplete removal of cleaning fluids can hinder the functional lifetime of the product. Contaminates trapped under a component are more problematic to failure. Advanced test methods are needed to obtain "objective evidence" for removing flux residues under leadless components.Cleaning process performance is a function of cleaning capacity and defined cleanliness. Cleaning performance can be influenced by the PCB design, cleaning material, cleaning machine, reflow conditions and a wide range of process parameters.This research project is designed to study visual flux residues trapped under the bottom termination of leadless components. This paper will research a non-destructive visual method that can be used to study the cleanability of solder pastes, cleaning material effectiveness for the soil, cleaning machine effectiveness and process parameters needed to render a clean part.
Technical Library | 2022-12-19 18:59:51.0
Material and Process Characterization studies can be used to quantify the harmful effects that might arise from solder flux and other process residues left on external surfaces after soldering. Residues present on an electronic assembly can cause unwanted electrochemical reactions leading to intermittent performance and total failure. Components with terminations that extend underneath the package can trap flux residue. These bottom terminated components are flush with the bottom of the device and can have small solderable terminations located along the perimeter sides of the package. The clearance between power and ground render high electrical forces, which can propagate electrochemical interactions when exposed to atmospheric moisture (harsh environments). The purpose of this research is to predict and understand the functional performance of residues present under single row QFN component packages. The objective of the research study is to develop and collect a set of guidelines for understanding the relationship between ionic contamination and electrical performance of a BTC component when exposed to atmospheric moisture and the trade-offs between electrical, ionic contamination levels, and cleanliness. Utilizing the knowledge gained from undertaking the testing of QFN components and associated DOE, the team will establish a reference Test Suite and Test Spec for cleanliness.
EMST Stallion PLC TT-JW is a new table top wave soldering machine from EMS Technologies, the soldering specialists. After the world wide success of the previous table top model, EMST Stallion, it is upgraded from manual controls to PLC based control
SMTnet Express, July 20, 2017, Subscribers: 30,612, Companies: 10,637, Users: 23,528 Reactivity Of No-Clean Flux Residues Trapped Under Bottom Terminated Components Bruno Tolla, Ph.D., Jennifer Allen, Kyle Loomis - Kester Corporation , Mike
SMTnet Express, August 15, 2019, Subscribers: 32,226, Companies: 10,855, Users: 25,017 Cleaning Flux Residue under Leadless Components using Objective Evidence to Determine Cleaning Performance Credits: KYZEN Corporation Cleanliness is a product
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