Plastic parts shape design of internal and external surface of easy molding, namely take part as easy as possible, so the plastic parts should avoid as far as possible side concave convex part, because the mold structure of side core pulling and petals will not only improve the mold design, manufacturing cost, reduce the efficiency of production, but also left in the parting line flash, increased after processing workload. Sometimes in order to meet the requirements of the use of plastic parts under the premise, only changing the structure of plastic parts, can greatly simplify the mould structure to.
  Inner and outer side bump plastic shallow and allow with rounded corners, can adopt an integral convex die forced demoulding out plastic parts, then, plastic should have enough flexibility in the mold temperature, such as polyethylene, polypropylene, poly formaldehyde plastic. In most cases, side bump plastic can not be forced demoulding, you should use side parting and core pulling.