extrusion - meaning and definition. What is extrusion
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What (who) is extrusion - definition

PROCESS USED TO CREATE OBJECTS OF A FIXED CROSS-SECTIONAL PROFILE
Extruder; Extrude; Extruding; Screw extruder; Extrusion molding; Hydrostatic extrusion; Extruded; Hydrostatic Extrusion; Single screw extruder; Extrusion press; Reactive extrusion; Aluminium extrusion; Hot melt extrusion; Extrudate; Extruded aluminum
  • Sectional view of how a caterpillar haul-off provides line tension
  • HDPE pipe during extrusion. The HDPE material is coming from the heater, into the die, then into the cooling tank. This Acu-Power conduit pipe is co-extruded - black inside with a thin orange jacket, to designate power cables.
  • Elbow [[macaroni]] is an extruded hollow pasta.
  • Clay body being extruded from a de-airing pug

extrusion         
n.
Expulsion, ejection.
extrusion         
(extrusions)
Extrusion is the act or process of extruding something. (TECHNICAL)
N-VAR
Extrusion         
·noun The act of thrusting or pushing out; a driving out; expulsion.

Wikipedia

Extrusion

Extrusion is a process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section. Its two main advantages over other manufacturing processes are its ability to create very complex cross-sections; and to work materials that are brittle, because the material encounters only compressive and shear stresses. It also creates excellent surface finish and gives considerable freedom of form in the design process.

Drawing is a similar process, using the tensile strength of the material to pull it through the die. It limits the amount of change that can be performed in one step, so it is limited to simpler shapes, and multiple stages are usually needed. Drawing is the main way to produce wire. Metal bars and tubes are also often drawn.

Extrusion may be continuous (theoretically producing indefinitely long material) or semi-continuous (producing many pieces). It can be done with hot or cold material. Commonly extruded materials include metals, polymers, ceramics, concrete, modelling clay, and foodstuffs. Products of extrusion are generally called extrudates.

Also referred to as "hole flanging", hollow cavities within extruded material cannot be produced using a simple flat extrusion die, because there would be no way to support the centre barrier of the die. Instead, the die assumes the shape of a block with depth, beginning first with a shape profile that supports the center section. The die shape then internally changes along its length into the final shape, with the suspended center pieces supported from the back of the die. The material flows around the supports and fuses to create the desired closed shape.

The extrusion of metals can also increase their strength.

Examples of use of extrusion
1. You expectantly scan your seeds for any small extrusion of root or shoot.
2. Since October 2005, the extrusion rate has slowed to less than 1.3 cubic yards per second, Gardner said.
3. Due to the expansion in the construction sector, several extrusion plants have been set up all over GCC states.
4. There are 22 major extrusion plants in the region with a total production capacity of 300,000 TPA, and the overall capacity utilization exceeds 88 percent.
5. Gulf Extrusions Co, one of the largest aluminium extrusion plants in the Gulf region, has expressed concern about the results of the tests carried out on eight profiles.