The Shape and Position of Parting Line

For setting out plastic injection parts,material and putting insert, mold cavity consist of at least two or more parts, remove the product or material separation of part of the contact surface is called a parting line(PL). Parting line position, shape, and quantity depend on the plastic structure, applications and selection of gate type and other factors. From the perspective of simplified structure and guarantee the quality of products, the parting surface is perpendicular to the closing direction, inclined to clamp or parallel to the direction of movement and direction.

Parting surface can be classified as flat, angled, stepped, profiled parting surfaces as Fig 1. The flat parting surface is most commonly used. In order to meet the ejection, mold structure or application, angled, stepped and profiled parting surfaces may be used. But it may make the structure of mold more complex and mold processing more trouble. So the parting line position choice is important, which will affect the mould structure, plastic quality, mould manufacturing and maintenance operations.

The determination of parting surface position need to consider knockouting the workpiece off the mold, coaxial requirement, appearance requirement and mold parts manufactory as Fig 2,3,4,5.

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