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Molding Defects

Record Type flow marks



Striped patterns appearing in the area of gates


  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.

  • 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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 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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