Description

<style>.e_editor{font:14px/24px Roboto,Helvetica,Tahoma,Arial,'Microsoft YaHei','b8bf53';}.e_editor div,e_editor p,e_editor td,e_editor th,e_editor li{font-weight:inherit;font-size:inherit;font-style:inherit;font-family:inherit;}.e_editor ul{margin:-10px 0 20px;}.e_editor li{padding:5px 0;}.e_table{width:96%;border-collapse:collapse;empty-cells:show;}.e_table th,.e_table td{padding:5px;border:2px solid #eee;}.e_img{padding:10px 0;text-align:center;}.e_p{line-height:20px;padding:0 0 20px;text-indent:0em;}</style> <div class="e_editor"> <div class="e_p"> Hot air leveling and FPC </div> <div class="e_p"> Hot air leveling was originally developed for rigid printed circuit board PCB lead-out technology, because this technology is simple and also used in FPC. Hot air leveling refers to the vertical plate in the system directly immersed in the molten tin bath; the excess solder is removed by hot air blowing. As the polyimide film is easy to absorb moisture, foam or even stripping in the cover layer will happen due to rapid heating caused by the absorption of moisture, so before the FPC hot air leveling, must be taken the dry and moisture management. </div> <div class="e_img"> <img src="https://file.allpcb.com/bbs/17/05/08/110435415.jpg" width="300" height="225" /> </div> <div class="e_p"> Is it hard to find problems of FPC? </div> <div class="e_p"> When the FPC is newly plated, its appearance has no problem, but soon after some surface will have stains, dirt, and color and so on. Sometimes, the factory inspection still cannot find any, but the user will find the appearance problem. This is due to insufficient plating rafting and it slowly caused by chemical reactions on the surface after a period of time. In order to prevent this situation, you should not only fully drift, but also conduct a thorough drying. It is possible to confirm whether drifting is sufficient or not by the high temperature thermal aging test. </div> <div class="e_img"> <img src="https://file.allpcb.com/bbs/17/05/08/110351475.jpg" width="300" height="300" /> </div> </div>