Selected Properties and Shrinkage Compensating Effect by Injection Moulding of Origin and Recycled Thermoplastic Composites with Polypropylene (PP) Matrix, Talcum and Glass Fiber

This article explains and demonstrates how to first and second injection moulding influence to shrinkage effect of polypropylene composites with talcum and cutting glass fiber. Results show that the longitudinal and transverse shrinkage changed by differend parameters of injection moulding. It was observed shrinkage compensating effect occurring at composite molded parts with a high glass fiber content. Recycling process has reduced the shrinkage and tensile strength. Caused an increase in elongation, but it has not noticed any major changes in the hardness of injection molded parts.