Parting lines are an integral part of injection molded products because they separate two halves of a mold. They appear as a line around the perimeter of the part. It simply runs down the middle for most parts, but its location varies in complex parts.

Parting lines: How do they arise?

Parting line injection molding process rather than an error causes parting lines to form. Molding machinists generally divide injection molded parts into two halves (fixed and moving).

The structure of the mold can be parted repeatedly from different directions by machinists. This is called multi-step parting.

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What are the types of parting lines?

Parting line injection molding can be vertical, stepped, or comprehensive. However, it is dependent on the function and structure of the plastic part.

  • Vertical Parting Line

A vertical parting line is the most famous parting line in plastic design. Machinists from the vertical parting line from the mold opening direction in a perpendicular direction.

  • Stepped Parting Line

Machinists make a stepped plastic parting line with a large force on one side of the cavity for this type of parting line, which causes a relative possibility of sliding between the two halves of the mold as they move.

  • Comprehensive Parting Line

A carefully made parting line is one of the most meticulous processes in plastic design.

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