Difference Between Injection Molding and Extrusion
Injection Molding vs Extrusion
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In the industrial sector, injection molding
and extrusion are used for making different things with different shapes and
sizes.
Extrusion is a method by which molten
plastic or any other material is pushed through a two-dimensional die opening.
It then passes through a series of shapes or sizes where the molten form gets
the desired shape once it cools here. In the extrusion method, the finished
products have a two-dimensional form which are continuous in length. The
extrusion method produces linear shapes.
Both extrusion and injection molding have
their own advantages. An advantage in the extrusion method over other methods
is that it helps in creating complex cross-sections. Another advantage is that
brittle and hard materials can be formed into any shape using the extrusion
method. Moreover, the finished materials have a smooth surface finish when compared
to other processes including the injection method. In the injection method,
there is only minimal waste as the scrap can be recycled again.
The injection molding process is basically
based on the molten die-casting method. The injection-molding unit consists of
two elements: the injection unit, and the clamping unit. Unlike extrusion,
injection molding forms three-dimensional shapes.
Summary:
1.
Extrusion is a method by which
molten plastic or any other material is pushed through a two-dimensional die opening.
2.
The injection molding process
is basically based on the molten die-casting method.
3.
The extrusion method helps in
creating complex cross-sections.
4.
Brittle and hard materials can
be formed into any shape using the extrusion method. Moreover, the finished
materials have a smooth surface finish when compared to other processes
including the injection method.
5.
In injection molding there is
only minimal waste as the scrap can be recycled again.
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