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Causes and countermeasures of poor surface color and gloss of TPU products

Causes and countermeasures of poor surface color and gloss of TPU products
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  • 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
Top

(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.

The reasons causingPoor quality of raw materialsPoor lubricant qualityThe injection pressure is too lowThe injection rate is too slowInsufficient clamping force

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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