Designing a PET plastic recycling device includes a thorough review of polymer materials with a special emphasis on PET (polyethylene terephthalate) which is widely used in the production of packagin especially plastic bottles. PET plastic, as a thermoplastic polymer has significant potential for recycling due to its properties that enable reprocessing and shaping. In this paper, the processes and technologies that enable efficient recycling of PET are analyzed in detail, thereby reducing the amount of waste and harmful effects on the environment. Plastic recycling devices are elaborated through the description of key parts and functions. The external and internal parts of the device such as the crusher, the washing system, the extruder and the cooling system which play a key role in turning plastic waste into material suitable for reuse are specifically mentioned. The basic parts of the equipment needed to carry out the recycling process include systems for sorting and cleaning waste, shredding, heat treatment chambers and units for forming new products from recycled plastic. The advantages and disadvantages of PET recycling devices were also analyzed with an emphasis on parameters, costs and environmental sustainability. The PET plastic recycling process is described from the collection and sorting of the material, through mechanical processing that includes shredding and heat treatment to the final process of forming filaments or new products.