Appropriate draft angles, typically 1° to 3°, allow parts to release smoothly from vertical walls. Undercut management through side-actions or collapsible cores eliminates mechanical interference. Ejection pin placement avoids high-stress concentration areas. Surface finishes like polished steel or chrome plating reduce friction. Strategic gate locations minimize material connection points that could hinder part release.
LSR's flexibility aids in releasing from complex geometries, but its tackiness can cause sticking if mold surfaces aren't properly treated. Higher durometer grades may require more ejection force. Post-cure shrinkage can create tight fits in precision molds. Release agents or mold coatings can improve demolding, though they add process steps and potential contamination risks for sensitive applications.
Controlled cooling cycles allow parts to shrink away from mold surfaces before ejection. Synchronized ejection timing with cure completion prevents distortion. Air-blow systems assist in part removal from deep cavities. Vibration-assisted ejection can break adhesion bonds without damaging delicate features. These techniques reduce manual intervention and improve cycle time consistency.
Robotic arms equipped with vacuum cups or grippers remove parts immediately after mold opening. Vision-guided systems identify part orientation and adjust pickup positions dynamically. Automated sorting separates good parts from rejects. Integration with conveyor systems streamlines downstream handling. Automation reduces labor costs, improves safety, and increases throughput in high-volume LSR molding operations.
