Getting To The Point – Plastics

All About Plastic Extruder Machines With engineering skills and the right technical knowledge, plastic resin can be molded to any desired shape. Plastic comes in different shapes, colors and designs, and its application is widespread in homes and different industries. Plastic extruder machines have unique features that are largely used by industries for shaping products. Plastic extrusion is a manufacturing process handling large volume of raw plastic which is melted and shaped into a continuous profile, producing plastic films, pipe or tubing, deck railings, weather-stripping, fencing, plastic sheeting, wire insulation, thermoplastic coatings and many more. The process of plastic extrusion starts by feeding plastic materials such as plastic powders, pellets, granules or flakes from a hopper into the plastic extruder machine’s barrel. It is gradually melted using mechanical energy that is generated by heaters arranged across the barrel and turning screws, and the molten polymer is forced into the die, that shapes the polymer into pipes hardening during cooling. A plastic extruder machine has a feed screw, temperature controller and barrel, and the features and design depend on the type of material to be extruded and the product design. Various types of polymers have different screw designs and most screws have a feed, melting, metering, decompression and second metering zones. The feed zone is also known as the solids conveying zone has the same channel depth all throughout the zone, where the resin or material is fed into the plastic extruder machine. The zone with progressively smaller channel depth where the plastic polymer is melted is called the melting, transition or compression zone. The metering or melt conveying zone of an extruder machine has a constant channel depth and it is the zone melting the last particles, mixed to a uniform composition and temperature. The channel in decompression zone of an extruder machine gets deeper suddenly, relieving pressure and allowing trapped gases to be drawn out by vacuum is called the decompression zone. Second metering zone has greater channel depth than first metering zone but are similar and it serves to repressurize the molten polymer to get it through the screen and die resistance. There are different types of dies such as blown film extrusion, sheet film extrusion, tubing extrusion, overjacketing extrusion, coextrusion and extrusion coating. Blown film uses annular, spider and spiral plastic extrusion processes, and are used in manufacturing plastic films like shopping bags. Sheet or film extrusion involves extruding plastics that are too thick to be blown using either T-shaped or coat hanger. For manufacturing PVC pipes, tubing extrusion is used, involving the use of pin for applying positive pressure, and a vacuum sizer outside the diameter for application of negative pressure to make sure the final dimensions are correct. For more information check out our website.The Path To Finding Better Resources

Getting Down To Basics with Plastics