The generation mechanism and countermeasures of hot press:

①After the SMC material is plasticized by heat, the melt viscosity is large. Before the cross-linking and solidification reaction is completed, there is not enough time, pressure, and volume to fill the mold cavity with the melt.

②) The storage time of the SMC molding material is too long, and the styrene volatilizes too much, resulting in a significant decrease in the flow properties of the SMC molding material.

③The resin paste is not soaked into the fiber. The resin paste cannot drive the fiber to flow during molding, resulting in material shortage. For the shortage of materials caused by the above reasons, the most direct solution is to remove these molded materials when cutting materials.

④Insufficient feeding amount causes material shortage. The solution is to increase the feeding amount appropriately.