In order to prepare the input material for subsequent processing, primary shredders are used for first size reduction or pre-chopping.

The capacity of a recycling facility may be increased or bulky material may be made thicker for easy mobility using the primary shredder.

In order to secure the release of various fractions and to get the material ready for sorting, secondary shredders are employed on a variety of materials.

Raspers and powerful machinery are used to reduce the size of materials including rubber, copper and aluminium scrap, plastic, and electronic waste.

The Rasper is often used in the recycling and processing of used tyres. Because it separates the wire from rubber tyres in the purest form possible, these are used as secondary tyre recycling machines to reduce the size of pre-shredded pieces.