December 27 2014
Wikipedia defines Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed or drawn through a die of the desired cross-section. The two main advantages of this process over other manufacturing processes are its ability to create very complex cross-sections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. It also forms parts with an excellent surface finish. Extrusion may be continuous (theoretically producing indefinitely long material) or semi-continuous (producing many pieces). The extrusion process can be done with the material hot or cold.
Commonly extruded materials include metals, polymers, ceramics, concrete, play dough, and foodstuffs. The products of extrusion are generally called "extrudates". Hollow cavities within extruded material cannot be produced using a simple flat extrusion die, because there would be no way to support the center barrier of the die. Instead, the die assumes the shape of a block with depth, beginning first with a shape profile that supports the center section. The die shape then internally changes along its length into the final shape, with the suspended center pieces supported from the back of the die.
Suppliers of used and refurbished extruders
PERRY VIDEX Perry Videx offers a large selection of used extruders and refurbished extrusion machinery and downstream equipment. We sell both single screw extruders and twin screw extruders from 3/4" to 12" in diameter.



Well known brands such as: Davis Standard, Welex, HPM, Milacron, Berstorff, W&P and Leistritz can be found in our inventory.



There are many different types of Used Extruders, and we can help you find the right Extruder to meet your needs. Go here to review PV Inventory  Extruder Inventory


AARON EQUIPMENT




To see AARON'S inventory of extruders including Caleva Gear type extruders; Bepex/Rietz, MIG, Bonnot go to AARON EXTRUDER INVENTORY



Federal Equipment




As per Federal's website :


If you’re in the plastics, metals or composite-forming industries, it’s likely that you’ve come across new and used extrusion equipment. If you’re in the market for this type of equipment, you've probably thought about purchasing new equipment, but have you considered investing in used extruders?
Federal Equipment Company specializes in offering a wide variety of used industrial equipment including used extrusion equipment. Our selection includes:

• Single Screw
• Twin Co-Rotate
• Twin Counter-Rotate
• Dump/Hot Feed
• Rubber Extruders
• Instrument/Lab Extruders
• And more.




The Federal equipment list of extruders can be found at Federal Extruder Equipment List .