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Home » Extrusion Equipment » Extruder » Plastic Extruder

Plastic Extruder
Plastic extruders are basically screw extruders applied in the plastic industry for melting mixing and preparing the plastic material for extrusion. The profiles that can be made through this plastic extruders has a wide range that includes films, enclosed tubes/ bags in fact any shape in a continuous manner. A schematic of a basic extruder machine is shown here.

Plastic Extruder Machine

In the extruder machine, plastic pellets or beads popularly called as resins are fed from a hopper along the feed screw via a barrel chamber. As the resin makes its way along the barrel, it is subject to many forces in the form of compression, friction and heated zones. This makes the resin to melt. As it further travels the exit end of the screw helps to mix the melt in a homogeneous manner. The melt then enters a chamber that is designed for securing an evenly distributed flow to the die. In some machines, there is a melt pump in place to prevent occurrence of any pressure surges.

For co-extruding sheet products more than two plastic extruders are used. This facilitates multi-layer structures with distinct layers of plastic polymers. Plastic extruders are quite capable of making a vast range of items, these include tubes, sheets, rods, channels, and other custom shapes.

Types of Plastic Extruders
There are two types of extruders that are used for extruding of the plastics. They can be broadly classified as : Twin vs Single Screw Extruder
Twin Screw Extruder
  • Twin screw extruders are classic machines that is used in case of compound production. Which means, when two or more ingredients get mixed and extruded for producing a pellet.
  • Single screw extruders prove useful machines in production process, when pure polymer like HDPE is used.
Twin Screw Extruder
Single Screw Extruder
  • Single screw Extruder produces plastic, wood or other profiles from regrinding chips bereft of the need for pre pelletizing.
  • Twin screw extruders prove useful in case of production of rigid PVC and wood fiber blends.



Single Screw Extruder


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