K. Vakhrusheva A. Maksyakova A. Adykaeva O. Karabeleyeva Extruding K. Vakhrusheva A. Maksyakova A. Adykaeva O. Karabeleyeva

plan Definition of extrusion Types of extrusion The product to be extruded Extrusion’s equipment Main problems Solution of problems Conclusion

Definition of extrusion Extrusion is a process used to create objects of a fixed cross-sectional profile

Types of extrusion

Classification by the product to be extruded

Extrusion’s equipment

The main problems of extrusion modification to the rheological properties of the mass; any change to the profiles; modification to the screw or cylinder surfaces which courses the increased proportion in the flow-back; increase in the flow rate combined with increased strand velocity; vacuum errors through leakage.

Rheological properties Advantages are: Very complicated cross-sections are possible, Relatively small amounts of liquid are added to the solid, Binders and rheology modifiers can positively affect product properties, The technology is capable of shaping very hard and abrasive powders, A uniform density of distribution is achieved, The capital costs are low, The running costs are low

Modification to the Nozzle

Modification to the screw or cylinder surfaces

Modification to Flow Rate Extend the cylinder and screw Reduce the flow resistance of the nozzle or the nozzle consumer Increase the pressure-forming capacity of the screw Modification to the pressure increase angle through modification to the mass

Solutions of vacuum problem

Conclusion economically environmen-tal diversified