Surface Roughness of Structural Thermoplastic Mouldings

摘要

The influence of the injection molding conditions and the roughness of the mold cavity on the roughness of moldings was tested. Results show that the greatest influence on the surface roughness of moldings is exerted by roughness of the mold cavity and the injection temperature. The influence of the injection pressure is less important. An increase in the roughness of the mold cavity causes an increase in the roughness of the molding surface, while an increase in the injection temperature and pressure causes a decrease in it. It is shown that it is possible to write the relationship between the surface roughness of moldings and the injection temperature and pressure as mathematical formulas constituting the result of tests performed according to the statistical multifactorial method of planning of experiments.