This book explores the key technological and structural aspects of designing mixing and rolling equipment used to produce composites from thermoplastic waste. It pays special attention to modeling the mixing process within the working gaps—specifically, the deformation zones in the material being processed and the inter-roll clearance. An engineering methodology is presented for calculating the operational and structural parameters of periodic-action mixers, such as rotary and specialized roll-based machines, ensuring the desired quality of the resulting thermoplastic composites. Intended for engineers and technical specialists involved in the design and operation of mixing and rolling equipment for polymer processing, the book also serves as a valuable resource for graduate students, master's candidates, and upper-level university students studying fields related to plastics and elastomer recycling (specializations 151900.68, 261201, 240801, 261700).