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Extrusion of Double Screw Characteristics .pdf

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Extrusion of Double Screw: Characteristics
The reconstruction of the screws and rebase of barrels are more than services of cost
saving. They often offer better wear resistance than when the components are
new. Save money and bring your screw or barrel back to the new or better condition,
with barrel and screw remanufacturing services.
How Does Extrusion Work?
The objective of extrusion processing is the continuous physical-chemical
transformation of viscous polymers and the production of high quality structured
products, thanks to the precise control of the processing conditions.

The double screw extruders are composed of two screwed assemblies, coupled and corotating, mounted on fluted shafts located inside a closed barrel. Due to the wide range
of screw and barrel designs, various screw profiles and process functions can be
adapted taking into account the requirements of each process. Thus, the double screw
extruders can carry out the following processes: transport, compression, mixing,

cooking, shearing, heating, cooling, pumping, molding, etc. with high levels of
flexibility. The main advantage of the extruders of double screw reticulated and corotary is its remarkable mixing capacity, which confers exceptional characteristics to
the extruded products and gives a significant value to the processing units.
In the processes by extrusion of double screw, the raw materials can be solid (powders,
granulates, flours), liquids, suspensions, and possibly gases. The final products are
plastic composite, chemically customized polymers, textured foods and food products,
fibre pulps, etc

Different advantages of double screw extrusion
Over time, double screw extrusion has become the main standard for many industries,
because it offers innumerable advantages compared to the extrusion of a single screw:
Greater consistency in production, and control of product quality

Increase in productivity thanks to continuous processing, fast start-up and
detention between phases of product transformation, fast conversion and
advanced automation
Greater flexibility , with capacity to produce a wide range of raw materials
Optimized ecological impact , because the lines offer integral processing
From simple and easy maintenance
They allow to save energy and water
For easy cleaning thanks to the design CIP (cleaning in place)

Source Link - https://omegabarrelscrew.wordpress.com/2018/03/14/extrusion-of-doublescrew-characteristics/

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