Today we’ll introduce more problems of FRP profiles and measures.
Internal crack
Internal cracks are often associated with cross sections, cracks may occur at the center of the laminate, and may appear on the surface of fiberglass pultruded profiles.
Measure:
To improve the mold entrance temperature so that the resin will be curing early.
Lower the temperature of pultrusion mold end.
Lower the level of the initiator, especially the high temperature initiator. This is the best permanent solution, but some experiments need to assist.
The high temperature initiator is replaced by the low heat release, but the curing effect is better.
Shrinkage
Measure of surface irregularities caused by excessive shrinkage:
Add more glass fiber to reduce the shrinkage of the curing process
Addition of a reducing agent (low shrinkage additive) or increasing filler loading
Low hardness
The hardness test is low
Measure:
Reduce line speed to accelerate the curing of the resin.
Increasing mold temperature in order to improve the curing rate and the curing process of the mold lead to the over – and – plastic mixture.
Other contaminants, such as water, or pigment that can affect the rate of cure.
