Sink Marks–Technical Problem of Fiberglass Compression Molding

Condition Description Reasons Solution
1 The depressed deformation on the surface,ribs,raised part and/or the back side(shiny or dark). uneven shrinkage during molding. use low or no shrinkage resin in formulation for sheet molding compound(SMC)
2 increase the temperature of Cavity or Core and to bring the temperature difference between Cavity and Core to 5–6℃.
3 increase the pressure and shorten the length of glass fiber.
4 improve the mold design,change the feed position.
5 narrow the gap between core and cavity of fiberglass mold.
Project:
Why normal FRP(Fiber Reinforced Plastic) is with low anti sunshine application?

Ultraviolet light is the main reason to the application of anti sunshine. FRP made of vinyl ester ……

Usual type of mold structure

1.Stack molds(multi cavities): Stack molds are very common in custom plastic injection molding. It……

The Molding Process of directional laying Fiberglass Composite

1.Summarization: Because the fiber is the main carrier in the fiber-reinforced composite, and the ……

TOP