Material Drying
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Rough surface / matte surface
Fenómeno do problema
The product surface shows dense dot-like or network-like rough areas.
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.
Análise das causas
1.
Comprehensive factors: Poor melt plastication, low plastication temperature.
2.
Equipment factors: Insufficient screw mixing capability.
3.
Material/formulation factors: High moisture content in the raw material.
4.
Mold/tooling factors: Rough or worn inner wall of the die.
5.
Mold/tooling factors: Die temperature too low.
Solução
1.
Process parameter optimization and adjustment: Increase barrel temperature or increase the length of the plastication section.
2.
Mold/tooling improvement and maintenance: Check the wear of screw mixing elements.
3.
Equipment inspection and system maintenance: Fully dry the raw material.
4.
Material/formulation optimization: Polish or replace the die.
5.
Operating specifications and preventive measures: Appropriately increase the die temperature.
Conclusão principal
This problem is a typical manifestation of rough surface / matte surface 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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