Molding Undercut with Collapsible Cores
Creating plastic parts having undercuts present distinctive challenges for molding operators. Undercuts represent recessions in a plastic part. These cuts make it difficult for the mold to slide away once the plastic part has been formed. These features prevent direct removal of the core, consequently making it essential to use an additional mold piece. A side core or internal core lifter can be used to form the desired shape. Custom core parts machining may be required for the process to get the core. Use of undercut designs These are used to create threaded parts, such as: Snap-on products like lipstick containers Screw-on bottle caps · And a variety of medical, automotive and consumer grade products Threaded bottle caps have complexities with the undercuts. After the formation of caps, the threads of the part and threads of the core get intermeshed. This intermesh has to be disengaged before pulling out of the core and the c...