The process control of dispensing process plays an important role. The following technological defects are easy to appear in the production: the size of the glue dot is not up to standard, the wire drawing, the glue soaking pad, the solidification strength is not good and easily to drop and so on. To solve these problems, we should study the technical parameters as a whole and find out the solution to the problem.
1. Size of dispensing quantity
According to the working experience, the size of the pin-point diameter should be half of the pad spacing, and the diameter of the pin-point after the patch should be 1.5 times of the pin-point diameter. Sufficient glue is available to bind the components and avoid too much glue soaking the pad. The amount of dispensing is determined by the rotation time of the screw pump. In practice, the rotation time of the pump should be selected according to the production conditions.
2. Dispensing pressure
At present, the rubber dispenser uses screw pump to supply the dispensing needle hose with a pressure to ensure enough glue to supply the screw pump. Too much back pressure can lead to glue overflowing and too much glue. If the pressure is too small, there will be intermittent glue dispensing and leakage, which will lead to defects. The pressure should be selected according to the same quality glue and working environment temperature. High ambient temperature will make the viscosity of glue become smaller, the fluidity of the glue will be improved, it reduces the back pressure to ensure the supply of glue.(Custom PCB Assembly)
Our Company is UL,ISO9001,ROHS and GJB9001B certified.
Packing and Shipping:
1. How to Get a quotation?
For PCBs,pls send us the Gerber File.For PCBA,pls send us the Gerber file and BOM(Bill of Materials)
2. What is the MOQ?
No MOQ.1 pcs is ok.
3.What is the lead time?
For PCB orders,the lead time is 2 to 10 days.For PCBA orders,the lead time will be 15 to 30 days.
4.Will the boards be tested before shippment?
Yes,all PCBs will be tested by Flying Probe or E-test.For PCBA,we will have AOI,X-ray,and functional test