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Causes and countermeasures of poor surface color and gloss of TPU products
- Categories:Industry news
- Author:
- Origin:
- Time of issue:2021-02-01 14:38
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(Summary description)
Causes and countermeasures of poor surface color and gloss of TPU products
(Summary description)
- Categories:Industry news
- Author:
- Origin:
- Time of issue:2021-02-01 14:38
- Views:
Information
The surface color and gloss of TPU products are mainly determined by the type of TPU materials, the quality of colorant and the surface finish of the mold. Defects in the mold gating system and poor processing technology will also cause defects in the surface color and gloss of TPU products. |
Treatment countermeasures |
|
Replace the raw material |
|
The raw material is mixed with impurities |
Replace the raw material |
Insufficient drying of raw materials |
Fully dry raw materials |
The raw material is not sufficiently plasticized |
The raw material is fully plasticized |
The colorant is of poor quality |
Change the colorant |
Replace lubricant |
|
Poor additive quality |
Replacement of additive |
Back to the material too much |
Use less or no return material |
The cold material enters the cavity |
Prevent cold material from entering the cavity |
Cavity surface grinding is not sufficient, poor finish |
Mold polishing |
The surface of the cavity is contaminated with water, grease or rust |
clean |
Poor mold exhaust |
Modify or add vents |
The gating system is defective |
Increase cold stock well, increase flow channel, polishing flow channel and gate |
Material temperature mold temperature is too low |
Increase the material temperature and mold temperature |
Increase injection pressure |
|
Speed up injection |
|
Insufficient injection time |
Increase injection time |
Back pressure is not enough |
Increasing back pressure |
Increase the clamping force |
Treatment countermeasures |
Treatment countermeasures |
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