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Molding Defects


Record Type flow marks


 

Characteristics

Striped patterns appearing in the area of gates

Cause

  Plastic which has been cooled by sprues and runners is further cooled in the cavity and filling occurs at high viscosity; consequently, plastic in contact with the mold surface is pressurized in a semi-solidified condition and stripes perpendicular to the flow direction are formed on the surface of the molded product.

Countermeasures
  • Lower the setting for injection speed.
  • Raise the injection pressure and hold pressure.
  • Raise the temperature of the plastic and the die.

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 UMG ABS Ltd. accepts no responsibility for the quality or safety of any customer products which use our materials or which have made use of any type of data provided by this company.
 Customers are requested to independently determine the suitability of our materials for their products. We also request that sufficient attention also be paid to laws, regulations, and industrial rights.


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