Homogeneity Test of Temperature and Pressure of Live Full Layer Press
It is essential to use a live full layer press during the processing of multilayer PCB. The pressure uniformity and temperature uniformity of the press have a considerable impact on the quality of the press. How to regularly test its stability through tests to ensure the quality of the press. There are relevant discussions on this issue in the forum, and the results are summarized as follows:
1. Pressure uniformity test method:
For the pressure uniformity test, there is a special induction paper, which is equivalent to the old high copy paper. The effect is better, but the price is very expensive. In addition, standard lead bars can be arranged in the press for testing. After the test, the residual thickness of each section of lead bars can also be measured to know the uniformity of the press, and the numerical value can be quantified.
In addition, the old-fashioned method is to place carbon paper on a piece of white paper for pressing, and then check the impression left on the white paper after pressing, so that you can know which position of the press platform is not pressed enough and which position is pressed evenly.
2. Temperature uniformity test method:
Use thermocouple thermometers to make more thermocouple lines, and then place them at nine or more points according to the position of the platform. After pressurization, record the temperature data at each position, and then make statistics and charts to easily see the temperature uniformity of the entire pressing platform. At the same time, the variation of temperature reproducibility can be obtained through multiple tests, so as to systematically evaluate the performance of the press.