**1. Introduction**

Plastics are inexpensive, easy to mold, and lightweight. These and many other advantages make them very popular candidates for commercial applications. In many areas, they have suppressed traditional materials. However, the problem on recycling still is a major challenge [1, 2]. There are both technological and economic issues that restrain progress in this field. Different types on recycling, primary, secondary, chemical, and biological recycling are discussed with related issues [3, 4].

Global introduction of waste utilization techniques to polymer market is currently not fully developed, but has an enormous potential [5]. Before reintegration of used material into a new product, it normally requires grinding, that is shredding, crushing, or milling. These processes make the material more homogeneous and easier to blend with additives. In traditional grinders like jaw crushers, roller mills, vibration and ball mills the generated stresses in material to be grinded are equal to or less than strength of material. If by traditional methods, the stresses generated are compressive + shift, so by milling based on collision are tension + shift.

Due to the high stress-material strength ratio at collision, it is possible to crush not only brittle materials but also ductile materials.

In current study the mechanical recycling of following groups of polymer materials were studied:

