Swell–Technical Problem of Fiberglass Compression Molding

Condition Description Reasons Solution
1 a semicircular swell on the surface of solidified fiberglass compression molding part. Entrapped air between fiberglass sheets. Remove the interlayer air by pre-pressing method and reduce the feeding area to facilitate the discharge of air.
2 The tooling temperature is too high (evaporation of monomer). low tooling temperature.
3 Solidifying period is too short (evaporation of monomer). Extend solidifying period.
4 dry fiber Reduce the viscosity of the resin.Install more work rolls in the impregnation area, and heat the dip rollers.Replace the glass fiber.
5 There are burrs in the cavity of fiberglass compression  tooling. Carefully remove the burrs in cavity of tooling.
6 Fiberglass sheet is too soft. Increase the thickening of fiberglass SMC raw material or increase the content of thickener.
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