Used Extruder equipment

Extruders
Extruders are machines that are designed to push or draw product through a die to create a desired shape. These machines are commonly used for plastic, metal, and foods. Special Projects International offers a variety of used extruders from well-known manufacturers like Buss, NRM, and Welding Engineers Inc. The different types of used extruders we offer are listed and described below.

Chemical Extruder
Chemical extruders are machines that are designed to process raw solids like powders, granules, or flours, liquids, slurries, and sometimes gases. These machines consist of two intermeshing, co-rotating screws within a closed barrel. They are designed to ensure transporting, compressing, mixing, cooking, shearing, heating, cooling, pumping, etc. of the feed material with a high level of flexibility.

Extruder Kneader
Extruder kneaders are machines that combine the efficiency of a double arm mixer with the convenience of extrusion screws for improved mixing and discharge of heavy viscous materials. This machine consists of a set of contra-rotating kneading blades and one or more extrusion screws. The blades are mounted on a horizontal axis in a W-shaped trough. Below the blades in a separate cavity are the extrusion screws. During the mixing cycle the blades rotate towards each other while the mixing screws rotate in a reverse direction, constantly feeding new materials into the mixing blades. After the mixing/kneading cycle is complete, the screws are reversed and they extrude and transport the mixed materials out of the mix zone.

Plastic Extruder
Plastic extruders are machines that are designed to melt, process, and/or re-melt beads of thermoplastic resins. These machines consist of an auger that is powered by a gearbox. As the auger turns, the beads move forward and are melted by heat to be moved into the area that meters plastic in preparation for the next process phase.