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What is Extrusion? and why do we need an extruder screen?

Importance of extruder screen: Extrusion is a process in
which melted material like polymer, plastic, rubber etc.  is forcefully pass through a die with the
help of screw.

In 90% extrusion techniques use a melt-through woven
wire mesh screens that helps to filter out any pollutants before passing
through to main dia. The wire mesh screens are fitted with the breaker plates
which have holes. The breaker plates placed between screw or extruder and dia.

Woven wire mesh screens play an important role to
improve mixing and protect gear pumps from being damaged by hard particles. To
pump fine material, you need fine mesh shield.

Usually, the screen sets will install the supporting
screen near breaker and main filter screen mesh or finest screen mesh towards
the screw. This selection helps to save the screen from damage or blowing
contamination via breaker plate holes and being torn or twisted from the
rotating motion of the melt. 

There is possible combination that a mesh screen pack has
two screens for same woven wire mesh
count at either end. Like: a mesh screen pack has following combination:  18 mesh * 120 mesh * 80 mesh *60mesh *20
mesh. This type of combination screen pack is same look wise from both ends,
but we must ensure that the screen pack placed in right direction.

Some producers curious that the main filter screen
(fine mesh) can stuck or stop larger particles during the extrusion flow. The
supporters advise that it will helps to increase melt circulation and decrease
the degradation.

Sometimes
producers are worrying that wire mesh
screen can propose new variables to the procedure which can increase the
back pressure & melt temperature. Also, sometimes it affects the output as
well.  It requires more equilibrium which
effect the final material cost. 

YKM has full service for manufacturer and supplier of Wire Mesh Products.

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