After the plastic material cools inside the mold, the molded part must be released through an ejection system. One of its components is the ejector pin, which pushes the part out of the mold cavity. Pin placement needs to consider the product's geometry and visible surfaces. Poor positioning may leave push marks or cause deformation when the part is released.

Ejection system design should consider the number of contact points, contact area, and the characteristics of the surfaces receiving pressure. Avient's mold design guidance explains that ejector pins should be positioned where they will not affect product appearance, with suitable pin dimensions to minimize visible marks. This shows that product surface quality depends not only on cavity design but also on the ejection system.

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