The actual definition of pipe may change
in context of the application for which they are used. Some of the
industries using extruded pipes include plumbing, mining, gas transmission
lines, beverages etc. However a popular definition of extruded pipes can be
given as a rigid, hollow, long and having large diameter as compared to
tubes. A basic difference between pipes and tubes lies in the fact that in
case of Tubings, they are flexible and has relatively small diameter. Pipes
can be extruded using plastics, along with metals like aluminium and rubber.
They are discussed in detail here.
- Extruded Aluminium Pipe
Extruded aluminium pipes are used in various critical applications.
With state-of-the-art hydroforming operation there is a distinct
possibility to shape it three-dimensionally in just a single operation.
These pipes are extremely popular for their use in the automobile
industry. The following image describes an extruded aluminium profile.
Take note of the changes in cross sections throughout the entire length
of the pipe.

The principle behind this unique shape is described here. The profile
is first positioned in a die. The die has an inner geometry that exactly
replicates the shape of the profile to be extruded into finished
component. As the die is locked very securely in a perfect position,
then hydrostatic pressure is set up in the pipe (profile). The profile
takes the shape of the die when the profile gets pressed against the
die.
- Extruded Pipes of Plastic
A very popular material for extruding Pipes is the thermoplastic
material. A very popular equipment to extrude pipes is the Single screw
extruder. In case of PVC twin screw extruders are applied. Dies in use
are the same basic type that is used in the wire coating. A Good
extrusion line for producing pipes must aim at reducing material cost
and give tight tolerances. Plastic material are first fed into the
hopper and then to a rotating screw. It is here they are heated up and
subsequently softened. Consequently the pipe that is now softened up is
forcibly passed through a die in continuous stream to form a pipe. Then
they are passed through a cooling chamber and cut according to the
required length. A simple extrusion line is shown in the image.
Materials used in the Extruded Plastic Pipes
Some of the popular plastic materials used includes:
- PVC
The following image show clear extruded PVC pipes.

- Polyethylene
Irrigation sector is one of the major user of PE pipes contributing to
around 60% of the total PE market demand.
- HDPE
- Polypropylene