what is slider and lifter

explain about slider and lifter where will use and when will use that and why we r using slider and lifter

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In plastic injection molding, core separates from cavity and is drawn in tooling direction. Sometimes there are some features on B Side of surface and they create interference in mold separation (features like snaps, dog house etc), they are in internal undercut region. So a lifter needs to be employed in those areas. At the time of mold separation, lifter comes out of the undercut and then core gets separated

 
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