Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. The most important stage reflux Shenzhen circuit board technology, when all of the individual particles melt the solder, combined together to form a liquid tin, then the surface tension of the solder feet began to form surface of the circuit board process characteristics, the gap if the component lead and PCB pad more than 4mil (1 mil = thousandths of an inch), then most likely due to the surface tension so that the pins and pads separately, that cause open solder joints. Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. Also called slope for the PCB temperature from ambient temperature to be raised to the activation temperature. In this area, the heat capacity of the circuit boards and components are different, they actually raise the temperature of the different rates. Temperature circuit boards and components should not exceed 2 ~ 5 ℃ per second speed of the continuous rise in circuit board technology advantage, if excessive conductive circuit board technology, will produce thermal shock, circuit boards and components that are likely to damage, such as ceramics tiny cracks capacitance. The temperature rise is too slow, the paste will be excessive temperature, solvent evaporation is insufficient, affecting the quality of welding. Oven preheat zone usually accounts for 15 to 25% yield of the entire circuit board technology heating zone length, Shenzhen circuit board technology, Newell record provided by the Department of Shenzhen-Electronic Technology Co., Ltd. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) strong, credible, a printed wiring board in Shenzhen, Guangdong and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Newell invasive and you hand into the brilliant, for a better future!