Introduction to SMC sheet molding plastic molding process:
Process principle: After a certain amount of SMC molding material is loaded into the mold, the SMC molding material plasticizes, flows, and fills the mold cavity at a certain temperature and pressure
At the same time, the SMB molding material undergoes cross-linking and agglomeration reactions, forming a three-dimensional structure to obtain the expected product. Throughout the entire pressing process, processes such as pressurization, shaping, and insulation rely on the closure of the heated mold.
Under the conditions of heating, pressure, and insulation, the molded material undergoes the following stages of changes.
A, The first stage is the heating and plasticization of SMC molding material, which flows and fills the mold cavity to obtain the required shape of the product.
B, The second stage is the crosslinking reaction between resin and crosslinking monomer, forming a partial network structure. The viscosity of SMC molding material increases, the flowability decreases, and it exhibits a certain degree of elasticity.
C, The third stage is the continuation of crosslinking reaction, where the copolymerization reaction between resin and crosslinking monomer becomes more complete, causing the SMC molding material to lose fluidity and significantly increase hardness.