Describe the extrution process, Mechanical Engineering

Assignment Help:

Q. Describe the extrution process?

The extrusion process, in many cases produces material in an intermediate form for subsequent reprocessing to its final component form. The process is the same as for metals, that is, the expulsion of material through a die of the required cross-section. Simplicity in operation and a controlled pressure which can be virtually high as required. If the polymer can be plasticized by pressure, then the ram extruder is advantageous in view of its simplicity. But for plastics which require heat, the separate pre-processing mat be regarding as a draw back. Another major drawback of this type of machine is the reciprocating action of ram which is time wasting since the ram must be withdrawn after its power stroke and a new dolly of material inserted in the container. Also, with many materials, the die office must be cleaned between each working stroke.

Nowadays, the ram machine is mainly used for "wet extrusion" that is for extruding plastics which have been softened by the addition of solvents. Solvent has to be removed.

For extrusion of plastics, single-screw machine has completely replaced the ram type machine. There are two basic types of screw extruders: the melt extruder and the plasticizing extruder. In the formal, the material is delivered to the extruder already melted and thus the function of the extruder is merely to push the material to the die and through the orifice. In the plasticizing extruder the material is in the form of granules or particles and so the extrude has to compress and work it until it melts before delivering it, under pressure, to the die orifice.


Related Discussions:- Describe the extrution process

Kleins construction method , How kleins construction method is different fr...

How kleins construction method is different from other type of graphical method

Equipment for resistance welding, EQUIPMENT FOR RESISTANCE WELDING The ...

EQUIPMENT FOR RESISTANCE WELDING The equipment for resistance welding is different from that for arc welding for the following reasons: Resistance welding machines are complica

Gdfgfgaf, dgdsgsfd sfdsvdsfsdf dsfsdgsgdsfsada sfdsfdsvsdfsd sgghdfgsgfa

dgdsgsfd sfdsvdsfsdf dsfsdgsgdsfsada sfdsfdsvsdfsd sgghdfgsgfa

Air-gas cross-limiting and air-gas ratio control, Q. Air-Gas Cross-Limiting...

Q. Air-Gas Cross-Limiting and Air-Gas Ratio Control? The Steam Generator firing demand signal is directed to two discrete signal selectors. A low signal selector ensures that

Draw the bending moment diagram and shear force diagram, Draw the bending m...

Draw the bending moment diagram and shear force diagram: A cantilever beam of 8 m length is subjected to point loads of 15 kN, 10 kN, 25 kN and 20 kN at distances of 4 m, 2 m,

Boiler, Working, specification construction of Lancashire boiler

Working, specification construction of Lancashire boiler

Axis perpendicular to the vertical plane - square prism, Axis Perpendicular...

Axis Perpendicular to the Vertical Plane - square prism: Here a square prism, side of base 40 millimeter and axis 60 millimeter long is resting on the HP on its base along wit

Direct and bending stresses, Direct and Bending Stresses: defined n...

Direct and Bending Stresses: defined neutral axis, introduced the influence of axial force and bending moment on different sections, attained the core or kernel of di

Idle circuit of motorcycle, Idle Circuit : During Idling while the th...

Idle Circuit : During Idling while the throttle valve is almost closed the vacuum is very high at Venturi area and no air-fuel mixture is drawn through the main circuit, as t

Welding procedure specification (wps)-variables, Variables used in WPS ...

Variables used in WPS Depending on their influence on obtaining a desired weldment, the welding variables are then classified and listed. Some of them are listed as "Essential

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd