Acrylic parts demand perfect clarity. Trapped air ruins that fast. Good venting lets gas escape before it burns or leaves streaks.
Acrylic flows thick and hot. It packs hard against mold walls. Any air pocket compresses, heats up, and chars the plastic. You see silver streaks, bubbles, or brown spots. Vents fix this. Place them at flow ends, rib bases, and blind corners where air gets trapped. Standard vents run 0.02–0.04 mm deep for acrylic—deep enough to bleed gas, shallow enough to stop flash.
Options vary. Parting line vents cost nothing extra but need precise machining. Ejector pins double as vents with added clearance. Porous sintered metal inserts vent tough spots without visible parting lines. For high-gloss acrylic, vent placement hides marks on non-show surfaces.
FAQ: How do I know if poor venting causes my defects? Check the pattern. Burn marks at flow fronts or thick sections point to trapped gas. Short shots with splay suggest air blocking fill. Polish vents first before you change process settings.
Need precision molds with proper acrylic venting built in? Contact Yigu Sourcing and we’ll connect you with mold makers who understand optical-grade acrylic demands.
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