Single screw extruder,Single screw extruder manufactures,Single screw extruder suppliers,exporters

single screw extruder

Introduction

Extrusion Process:

Single screw extruder basically consist of a screw, barrel, drive mechanism, resin feed arrangement and controls. The constantly turning screw moves the resin through the heated barrel where it is heated to proper temperature and blended into a homogeneous melt. A turbulent back pressure is build up which pushes the melt out of the extruder in the shape of the die. The resin sometimes is not completely melted in the basic extrusion screw. The barrier screw in designed to counter this problem. Sometimes, additional flights are attached to the transition section so as to separate molten and solid plastic to different channels. As the solid pellet moves forward it melts due to shear against the wall and thus melts and flows into the liquid channel. Thus the solid channel narrow gradually and the liquid channel widens.

The ability of a screw to manufacture products of good quality with high productivity and low cost is called its performance. At the design stage of an extrusion

Extrusion screw design has been improving over the years, with new innovations and ideas. Nowadays, single screws are available that have a secondary flights that improve speed by enabling faster melting. Single screw extruder is available with different types of accessories like automatic gravimetric feeders, vent vacuum units, heat and pressure controllers, heat exchangers, melt pumps, static and dynamic mixers, microprocessor control systems, as well as with a wide range of screw geometries for different materials and products.