Single Screw Extrusion – Plastics Technology

Single screw extrusion is one of the core operations in polymer processing and is also a key component in many other processing operations. The foremost goal of a single screw extrusion process is to build pressure in a polymer melt so that it can be extruded through a die or injected into a mold. Most machines are plasticating: they bring in solids in pellet or powder form and melt them as well as building pressure.

A single-screw extruder is a press which pushes material through its barrel under conditions of high pressure and temperature. It can produce objects of different length with a cross-section corresponding to the outlet opening.

Applications

The extrusion process melts the raw material and then hardens it once shaped. It can be applied to ceramics, rubber, thermoplastic polymers, pasta and other food products.

Technologies

These machines have a single screw turning within a cylinder, which is usually smooth. Raw material is fed into the barrel through a hopper and extruded into a die, which gives the material its final shape.

The barrel consists of three main zones: feed, compression and metering. The pressure increase within the extruder and movement of the material through the barrel are a function of screw geometry and the friction of the material against the screw and the barrel walls.

More Details:http://ptfe-machinery.com/single-screw-extruder/

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s