What are the problems of pressing 3240 epoxy glass fiber board under high temperature?
1. Flowering on the surface. The reasons for this problem are uneven resin flow, damp glass cloth, and too long preheating time. Use moderate fluidity resin and control the heating time.
2, surface cracks. The thinner the board, the more likely this problem will occur. The crack may be caused by thermal stress, or it may be caused by excessive pressure and untimely pressurization. The solution is to adjust the temperature and pressure.
3. Surface area glue. This is easy to occur in thick plates, where the thickness of the plate is large, and the temperature transfer is slow, resulting in uneven resin flow.
4. The board core is black and the surroundings are white. This is caused by the excessive volatility of the resin, and the problem lies in the dipping step.
5. Layering of plates. This may be caused by poor resin adhesion or too old glass cloth. In summary, the reason is that the quality is too poor, due to the replacement of high-quality raw materials.
6. The sheet slides out. Excessive glue content can cause this problem, and the ratio of glue solution is very important.
7. Sheet warping. Thermal expansion and contraction are the laws of physics. If the heat and cold occur suddenly, the internal stress will be destroyed and the product will be deformed. During production, the heating and cooling time should be sufficient.
