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.
Why do Resins cure quickly in barrels,but slowly after pasting fabric?

Sometimes, such problems happen in the field construction:it is normal for the exothermic of the r……

Effect of Heat Treatment on Service Life of Plastic Injection Moulds

    The heat treatment of the moulds has a great influence on its service life. Most of the Plasti……

Comparison of Applicability for process of Fiberglass Hand Lay Up,RTM and Compression Molding(SMC/BMC)

Comparison Hand Lay Up RTM SMC/BMC Molding Temperature/℃ indoor temperature 40-60℃ or i……

Rough Fingering Orgasm Sacando La Leche Hot Vip Orgy In The Club Asian Babe Gives Deep Blowjob Pov Amateur Teen Close Up Video Casting