Extrusion & Post
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Insufficient surface gloss
Fenómeno del problema
Product surface is dull and lusterless.
When this defect appears in extrusion molded products, it is usually closely related to process links such as die design, screw plastication state, cooling and sizing system, or haul-off stability.
Persistence of the defect will lead to out-of-tolerance product dimensions, unqualified appearance, or decreased mechanical properties, increasing scrap rate and rework costs.
Timely diagnosis and troubleshooting from both extrusion process parameters and equipment status are basic requirements for ensuring stable continuous production.
Análisis de la causa
1.
Mold/tooling factors: Die temperature too low causes poor melt-die wall interface.
2.
Mold/tooling factors: Poor surface finish of the sizing section.
3.
Cooling/environmental factors: Cooling water temperature too low causes surface quenching.
4.
Material/formulation factors: Large amounts of filler added to raw material cause microscopic surface roughness.
5.
Material/formulation factors: Formulation lacks brightener or additives improper.
Solución
1.
Process parameter optimization and adjustment: Appropriately increase die temperature.
2.
Mold/tooling improvement and maintenance: Polish the sizing section working surface.
3.
Equipment inspection and system maintenance: Appropriately increase the initial section cooling water temperature to slow quenching.
4.
Material/formulation optimization: Optimize filler particle size and dosage.
5.
Operating specifications and preventive measures: Add brightener or use high-gloss grade resin.
Conclusión clave
This problem is a typical manifestation of insufficient surface gloss in extrusion molding.
The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of the die/sizing system.
It is recommended to start with parameter adjustment and gradually go deeper into the equipment and tooling levels.
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