the flanks of plastic parts are usually provided with holes or flutes, under such cases, side-direction forming cores must be employed to form plastic parts. However, such forming cores must be fabricated into active parts so that they can be pulled out prior to the stripping of plastic parts. The mechanism for pulling out and restoring such active forming cores is called core-pulling mechanism,it usually comprises the following types:
1)Manual pulling 2）Hydraulic or Pneumatic Core-pulling 3）Power-driven core-pulling 4）Side core-pulling mechanism drive by spring