|Draft and wall thickness are
two of the most critical and overlooked fundamentals
when manufacturing injection molded parts.
Draft is a design feature that involves tapering the side walls of a part to allow it to be released from the mold when the mold opens. Drafting walls in the direction of the mold helps to prevent sticking and dragging as the part ejects.
The recommended draft angle for parts is 0.5 to 1 full degree of draft on all surfaces. If your part includes textured walls, you will
|need to increase the amount of draft to ensure clean ejection. We suggest that
1.5 – 2 degrees of draft be used per 0.001” of texture depth. This rule is for sidewalls of the tool that will shrink away from the cavity. Areas in the part that
will shrink toward the core of the tool will require more draft. The amount of draft needed for these walls will vary based on part design.
Wall thickness is another critical component of design that can affect the success