In case you missed it: cleaning."Optimizing Cleaning Energy in Batch and Inline Cleaning Systems: Phase II" [TEXT NOT REPRODUCIBLE IN ASCII ASCII or American Standard Code for Information Interchange, a set of codes used to represent letters, numbers, a few symbols, and control characters. Originally designed for teletype operations, it has found wide application in computers. ] Abstract: In 2004, Stach and Bixenman found that defining an optimized electronics assembly cleaning system requires an understanding of the balance between the static (kinetic) and dynamic (potential) energies to achieve maximized cleaning performance. Attributes or characteristics that influence cleaning performance center around surface energy, surface tension, capillary capillary (kăp`əlĕr'ē), microscopic blood vessel, smallest unit of the circulatory system. Capillaries form a network of tiny tubes throughout the body, connecting arterioles (smallest arteries) and venules (smallest veins). action, spray nozzle A spray nozzle is a device that facilitates the formation of spray. When a liquid is dispersed as a stream of droplets (atomization), it is called a spray. The typical purpose of the spray is to maximize the effect of the liquid by increasing the total surface area for better design, equipment design, time, temperature and cleaning chemistry. Phase II of this research tests the process cleaning rate equation, which equals the static cleaning rate (chemical forces) plus the dynamic cleaning rate (mechanical forces), using inline cleaning equipment. The test vehicle is the SMTA SMTA Surface Mount Technology Association SMTA Standard Material Transfer Agreement SMTA Subordinate Message Transfer Agent SMTA Sewing Machine Trade Association (UK) SMTA Sekolah Menengah Tingkat Atas Safer Board. The baseline establishes the solubility solubility Degree to which a substance dissolves in a solvent to make a solution (usually expressed as grams of solute per litre of solvent). Solubility of one fluid (liquid or gas) in another may be complete (totally miscible; e.g. rate of the cleaning solution, at static conditions, to determine the dissolution rate of flux residue at a pre-determined cleaning chemistry concentration and temperature. Once the cleaning rate is known, how will it be improved by applying physical energy to the board surface? The experiment tests the effect of energy applied to the board surface by varying nozzle configuration, distance from nozzle to board, time in system and mass flow rate. The study hypothesis infers that a known dissolution rate and a known surface energy configuration permits an equation to calculate cleaning time and distance. The response variables are visual topical inspection, ion chromatography Ion-exchange chromatography (or ion chromatography) is a process that allows the separation of ions and polar molecules based on the charge properties of the molecules. analysis and removal of BGAs to look for residue. Independent variables include nozzle types with various attributes. The work is a joint effort between a cleaning equipment manufacturer and cleaning material manufacturer with support from industry users. The study correlates data from the independent variables and their effect on the dependent variable. (SMTA International, September 2005) Authors: Stan Stach and Mike Bixenman; sstach@aat-corp.com. CIRCUITS ASSEMBLY provides abstracts of papers from recent industry conferences and company white papers. With the amount of information increasing, our goal is to provide an added opportunity for readers to keep abreast Verb 1. keep abreast - keep informed; "He kept up on his country's foreign policies" keep up, follow trace, follow - follow, discover, or ascertain the course of development of something; "We must follow closely the economic development is Cuba" ; "trace the of technology and business trends. |
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