Epoxy board is a commonly used material now, and the raw materials
for production include epoxy resin, glass fiber cloth, etc. It is a composite
material that needs to be pressed at high temperatures. In the production
process, there will be problems such as surface flower, board core black,
surface area glue, etc., problems and solutions that are easy to occur in the
process of epoxy board pressing.
1. Flowering on the surface. The reasons for this problem are
uneven resin flow, damp glass cloth, and long preheating time. Resin with
moderate fluidity should be used and the heating time should be well
controlled.
2. The core of the board is black and the surrounding is white.
This is caused by the excessive volatility of the resin, and the problem lies
in the step of dipping.
3. Surface cracks. The thinner the board, the more prone to this
problem. The crack may be caused by thermal stress, or it may be caused by
excessive pressure and untimely pressure. The solution is to adjust the
temperature and pressure.
4. Surface area glue. This is prone to occur in thick plates,
where the thickness of the plate is large and the temperature transfer is slow,
resulting in uneven resin flow.
5. Plate layering. This may be caused by poor resin adhesion or
too old glass cloth. The reason is that the quality is too poor, and it is replaced
by high-quality raw materials.
6. The sheet slides out. Too much glue can cause this problem,
and the ratio of glue is very important.
7. Plate warping. Thermal expansion and cold contraction are
physical laws. If it is hot and cold, the internal stress will be destroyed and
the product will be deformed. During production, the heating and cooling time
should be sufficient.