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In the extrusion process, the biota is the part which lies in the bucket.

The core is the most exposed to heat, rubbing and therefore abrasion in the extrusion process.

The corrosion resistance of the core material must be in the desired level of resistance to deformation. Various special materials can be used as well as hot work tool steels such as 1.2344 and 1.2367.

In order to extend the core life and to prevent possible extrusion errors, maintenance of the core at six months intervals should be carried out if necessary.

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