Addressing Surface Dullness and Uneven Gloss in TPE/TPR Injection Molded Products
Time of issue:2024-08-23
Summary of Causes and Solutions for Surface Dullness and Uneven Gloss in TPE/TPR Injection Molded Products:
(1) Excessive Injection Speed and Prolonged Material Residence Time
Cause: Rapid injection speed and extended material residence can lead to decreased surface gloss.
Solution: Reduce the injection speed and minimize material residence time.
(2) Poor Thermal Stability of TPE/TPR Material
Cause: Thermal decomposition due to poor thermal stability.
Solution: Select TPE/TPR materials with good thermal stability and gloss, or add thermal stabilizers to the material.
(3) Low Barrel and Nozzle Temperatures
Cause: Low temperatures result in decreased surface gloss.
Solution: Increase the nozzle temperature and melt temperature.
(4) Poor Mold Surface Finish
Cause: Dull mold surface leads to dull product surface.
Solution: Use carbon tool steel and carefully polish the mold surface to improve its finish.
(5) Insufficient Back Pressure During Plasticization
Cause: Inefficient mixing of TPE material and colorants due to low back pressure.
Solution: Increase the back pressure appropriately.
(6) Impurities and Inadequate Drying of TPE/TPR Material
Cause: Contaminants and moisture reduce surface gloss.
Solution: Remove impurities, thoroughly dry the material, and consider installing a hopper dryer if necessary.
(7) Small Runner and Gate Sizes, Poor Ventilation
Cause: Insufficient flow and ventilation cause poor surface gloss.
Solution: Enlarge the runner and gate sizes, and add venting channels.
TEL: +86-0752-6768128 FAX: +86-0752-6768088 MAIL: sales@tpe-sp.com WEB: en.tpe-sp.com
ADD: Huangxi Industrial Park, Shiwan Town, Boluo County, Huizhou City, Guangdong Province，China