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Introduction
Sheet extrusion is a technique for making flat plastic sheets
from a variety
of resins. Extrusion is a manufacturing process where a billet
of material is drawn through a die to create a flat sheet.
The process usually creates long length of the final product
and may be continuous or semi-continuous in nature.
Two types of extrusion processes are used in the ARITA PLASTICS;
1) Single Material Extrusion
2) Co-Extrusion
Monolayer Extrusion,
in this process, a single plastic material is processed on
a single extruder into the desired outcome.
 Co-extrusion
represents newer technology, in a process where two
or more polymers are extruded by two or more extruders into
a common die.
This allows more freedom in designing performance into his
final product. Material selection can be tailored specifically
to the requirements for the outer and inner layers.
For successful CO-extrusion, it is necessary that the polymers
be compatible in material properties
(i.e. melt viscosity, co-efficient of expansion, and lubricity).
The capstock (or top layer) contains the same basic resins
and ingredients as the substrate (or inner layer);
and the two layers remain permanently bonded as function of
die design,
heat and pressure. By custom designing the correct properties
in the capstock and substrate layers, a product superior to
monolayer extrusions is produced.
The Attraction
of Extrusion is the low tooling cost, color matching
and shorter lead times.
Advantages
of Extrusion
• Low cost tooling and short lead times
• Use of multiple materials in a variety of durometers
• Color matching
Market Segment
uses thick sheet for industrial and recreational applications
like truck bed liners, pallets, automotive dunnage, playground
equipment, boats and so on.
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