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:
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