What are the causes and troubleshooting methods of poor demoulding of injection molding machines? injection molding machine Poor demoulding, also known as die sticking runner, is due to the poor contact surface between the injection port and the nozzle arc, the gate material is not demoulded together with the product, and abnormal packing; Generally speaking, the diameter of the main flow path is large enough that the gate material has not been fully solidified when manufacturing demoulding.

The product is attached to the cavity regardless of the mold flow path. Poor demoulding is an important killer of plastic injection. The reason for poor demoulding may be different parts of the injection equipment or incomplete injection process. Although there is no burr, lack of mold lift angle, mold lift angle and other reasons caused by errors in molded product design and mold design, molded products sometimes have poor demoulding. If forced extrusion, the molded products often warp, turn white or crack after extrusion; In particular, the molded parts are stuck on one side of the static mold and sometimes cannot be ejected.

If the cavity and flow channel of the mold have such appearance defects as cut marks, cut marks, scars, pits, etc., the molded products will simply attach to the mold, making it difficult to demould. Therefore, the surface finish of the cavity and runner should be improved as much as possible, and the surface of the cavity should be chrome plated as much as possible. When grinding, the action direction of the abrasive must be the same as the filling direction of the melt.

If the melt has burrs in the damaged part of the mold and the gap between the inserts, sometimes it will cause difficulty in demoulding. In this regard, the damaged part should be repaired and the gap between inserts should be reduced.

If the mold cannot be opened at the beginning of injection, it indicates that due to lack of rigidity Large injection molding machine Deformation occurs under the action of injection pressure. If the strain exceeds a certain degree, the mold cannot be restored and can not be used any more. Even if the deformation does not exceed the elasticity of the mold to a certain extent, the melt will be cooled and solidified under the high conditions in the mold cavity, so as to eliminate the injection pressure. After the mold recovers the deformation, the molded products will also be trapped by the rebound effect.