1. Plastic extrusions are {produced|generated} by a process known as plastic extrusion.
Plastic extrusion is a {manufacturing|making} process where raw plastic materials are
melted down and then formed into a continuous profile. Plastic extrusion
{produces|generates} all types of different {items|things} and is
{particularly|specifically} useful for manufacturing window frames, tubing, pipes and
{weather|climate|weather conditions} stripping.
To extrude plastic into {various|numerous} forms, raw thermoplastic material
{called|named} resin in the extrusion {industry|business}, and in the form of small
beads, are {loaded|packed} into a gravity fed hopper which is {mounted|fitted} onto the
top of an extrusion barrel. UV inhibitors and {additives|chemicals} {such|this kind of}
as colourants are very often {mixed|blended} into the resin before it is loaded into the
hopper.
The resin {drops|falls} down into a barrel {which|that} {contains|includes} a screw
which can rotate from anything up to 120 rpm. The {screw|bolt} forces the resin or
{plastic|plastic-type} beads along the barrel {which|that} is heated to the
{desired|wanted} {temperature|heat}, and this can range from 200 degrees centigrade
to around 275 degrees centigrade. The barrels temperature is {controlled|managed}
along its {length|duration} so as the {beads|drops} move along it the
{temperature|heat} will increase. This gradual heating of the resin allows it to melt
{gradually|slowly} and more {evenly|equally} as it is forced along {through|by way of}
the barrel and minimises the risk of overheating {which|that} in turn {can|may} cause
the polymer to degrade. {Cooling|Air conditioning} fans may be used to lower the
{temperature|heat} of the {barrel|lens barrel} if too much heat is generated.
The {plastic|plastic-type} leaves the {screw|bolt} at the {front|top} end of the
{barrel|lens barrel} and {passes|goes} through a screen pack to remove any
contaminants which may be present in the melted plastic. The screens are
{strengthened|heightened} by a breaker plate which also helps to create back up
pressure in the {barrel|lens barrel} which is {required|needed} for uniform mixing and
melting of the polymer.
When the molten plastic has {passed|handed} through the breaker plate it enters a die.
The die gives the {product|item} its final shape or profile, and must be
{designed|created} to {allow|enable} the molten plastic to flow evenly from a
cylindrical profile, to the {products|goods} final profile form. A vast {number|range} of
{different|diverse} shapes and {forms|types} can be created using this process, as long
as it is a continuous profile.
The final heated {product|merchandise} is then cooled by being pulled through a water
bath. When compared with some metals, plastic conducts its heat away approximately
two thousand times more slowly, because {plastics|materials} are very efficient
{thermal|arctic} insulators. As soon as the {product|item} is cooled it may be cut into
manageable lengths or spooled for later use.
There are {quite|pretty} a few different types of {material|stuff} used in plastic
extrusions and some of these may include:
o Polystyrene: Polycarbonate: Acrylic: Nylon: Acetal: Acrylonitrile Butadiene Styrene.

2. Different extrusion process can include: Blown film extrusion, sheet/film extrusion,
coextrusion, compound extrusions, and over jacketing extrusions.