1. Peeling: When the cured resin particles on the surface of the part come out of the mold, this phenomenon is called peeling or shedding.
Solution: increase the temperature of the inlet feeding end of the early mold of the cured resin; reduce the line speed to make the resin cure earlier; stop the line for cleaning; increase the concentration of the low-temperature initiator.
2. Foaming: Foaming occurs on the surface of the part.
Solution: Increase the temperature of the inlet end mold to make the resin cure faster; reduce the line speed; increase the strengthening level. Blistering is often caused by voids caused by low glass fiber content.
3. Surface cracks: Surface cracks are caused by excessive shrinkage.
Solution: Increase the mold temperature to speed up the curing speed; reduce the line speed; increase the loading or glass fiber content of the filling, increase the strength and toughness of the resin-rich surface, thereby reducing shrinkage, pressure and cracks; add surface liners to the parts Or veil; increase the content of low-temperature initiator or use an initiator lower than the current temperature.
4. Internal cracks: Internal cracks are usually related to the thickness of the cross section. The cracks may appear in the center of the laminate or on the surface.
Solution: Increase the temperature of the feeding end to make the resin cure earlier; reduce the mold temperature at the end of the mold to use it as a radiator to reduce the exothermic peak; if the mold temperature cannot be changed, increase the linear speed to reduce The temperature and exothermic peak of the external contour of the part can reduce any thermal stress; reduce the level of initiators, especially high temperature initiators; replace high temperature initiators with initiators with low exotherm but better curing effect.
5. Chromatic aberration: Hot spots will cause uneven shrinkage, resulting in chromatic aberration.
Solution: Check the heater to ensure that it is in the proper position so that there will be no uneven temperature on the mold; check the resin mixture to ensure that the filler or pigment does not settle or separate.
6. Low hardness of the bus: The reading of the Barcol hardness tester is low due to incomplete curing.
Solution: Reduce the line speed to accelerate the curing of the resin; increase the mold temperature to increase the curing rate and degree of curing in the mold; check the mixture formula that causes over plasticization; check other contaminants, such as water or pigments that can affect the curing rate.
Note: Barcol hardness readings can only be used to compare the curing effects of the same resin. They cannot be used to compare the curing effects of different resins, because different resins will be produced with their own specific ethylene glycol, and their crosslinking depth will be different.
7. Bubbles or pores: bubbles or pores will appear on the surface.
Solution: Check whether the excess water vapor and solvent are caused by the mixing process or due to incorrect heating. Water and solvent will boil and evaporate during the exothermic process, causing bubbles or pores on the surface; reduce the line speed or increase the mold temperature to better overcome this problem by increasing the surface resin hardness; use a surface cover or surface felt. This will strengthen the surface resin and help eliminate air bubbles or pores; add surface pads or veils to the part.