Wrinkle Gate in Injection Molding — What It Really Means (Cashew / Banana Gate Explained) A “Wrinkle Gate” is not a molding defect but another name for a cashew or banana gate — a curved submarine gate widely used in automotive injection molding. Its purpose is to hide the gate on parts with strict cosmetic requirements, such as wheel arches, exterior trims, pillar trims and door handles. The curved tunnel allows clean degating and prevents visible marks on the A-surface. However, cashew gates are challenging to machine and often fail if the radius, steel choice or cooling is incorrect, leading to gate breakage or unstable production. This article explains how wrinkle/cashew gates work, why automotive parts rely on them, and what design factors ensure stable long-term performance.
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