Extrusion & Post
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Poor surface gloss of ABS products
Fenómeno do problema
The product surface is foggy and dark, failing to reach the brightness of the mold cavity; gloss fluctuates greatly between batches; appearance is unqualified.
Análise das causas
Two main causes: first, the polishing precision of the mold cavity is insufficient, with scratches and stains, and the defects are copied to the product surface; second, the melt cools too early during filling, the molecular chains have no time to stretch and conform to the mold, a mirror effect cannot be formed, and fog and flow marks may also occur, indirectly lowering the gloss.
Solução
①Increase the barrel and nozzle temperature to improve plasticization and mold conformance; ②increase the mold temperature to 60~80℃ (take the upper limit for high-gloss parts) to avoid premature cooling of the melt; ③increase injection pressure and speed and extend holding to let the melt quickly and fully conform to the cavity; ④re-polish the cavity and clean it regularly; ⑤prevent ABS from degrading and darkening.
Conclusão principal
ABS gloss='mold polishing + melt mold conformance': the mold determines the upper limit, temperature and pressure determine the replication; mold temperature has a great influence on gloss, the mold temperature for high-gloss parts must be given generously, and at the same time don't let degradation drag the gloss dark.
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