Will non-woven flame retardants cause uneven color of injection molded PP products?
Will non-woven flame retardants cause uneven color of injection molded PP products? The main reasons and solutions for the uneven color of injection molded products are as follows:
(1) Poor diffusion of the colorant, which often causes patterns near the gate.
(2) The thermal stability of plastics or colorants is poor. To stabilize the color tone of the parts, the production conditions must be strictly fixed, especially the material temperature, material quantity and production cycle.
(3) For crystalline plastics, try to make the cooling rate of each part of the part consistent. For parts with large wall thickness differences, colorants can be used to mask the color difference. For parts with relatively uniform wall thickness, the material temperature and mold temperature should be fixed.