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Plastics Extrusion | Plastics Technology Extrusion is a continuous process through which parts of a fixed cross-sectional profile are made Material is fed through a hopper into an extruder, essentially a rotating screw surrounded by a heated barrel, where it is mixed, melted and pumped through a die The die gives the part its shape Types include film extrusion, sheet extrusion, pipe, profile and tubing extrusion
Pipe, Profile and Tubing Extrusion | Plastics Technology Pipe is formed when plastics is extruded through a round shaping die, cooled in a water bath, and either cut and coiled Used in manufacture of medical tubing; PVC pipe; HDPE pipe; siding; plastic decking; plastic fencing; window lineals
Troubleshooting Flow Surging in Single-Screw Extruders During his 39 years at Dow, he has focused on development, design and troubleshooting of polymer processes, especially in single-screw extrusion He co-authored Analyzing and Troubleshooting Single-Screw Extruders with Gregory Campbell
Extrusion: Start Up and Shut Down Properly | Plastics Technology Extrusion: Start Up and Shut Down Properly A key goal during startup and shutdown of the extruder is to prevent degradation of the polymer left in the extruder and downstream components such as screen changers, adapters, and dies
Understanding Grooved Feed | Plastics Technology Understanding Grooved Feed U S processors still have some catching up to do when it comes to getting the most out of grooved-feed extruders But decades of European experience offer lessons on how to use grooved feeds to run even resins like TPU, nylon, and PET
EXTRUSION: Melting 101 | Plastics Technology EXTRUSION: Melting 101 Learn the basics on how polymer melts in a single screw Barrel temperature plays less of a role than you might think
Film Extrusion | Plastics Technology Film extrusion is divided into two subcategories: cast film (flat film) and blown film In cast film extrusion, hot plastic is extruded through a flat, slit die onto a polished chill roll where it is quenched, pulled to a second set of rolls to cool the other side, then wound In blown film extrusion, plastic is extruded into a cylindrical die, then inflated to form a bubble, which is cooled
Extrusion: Head Pressure and Output Stability | Plastics Technology In my June and July columns, I discussed how to use drag-flow and pressure-flow equations to analyze the performance of an extruder Those same equations can be used to analyze certain output stability problems If the output has a rhythmic surge, the cause is almost always a partially filled
Extrusion: Enhanced Deckle Boosts Coating Productivity Extrusion: Enhanced Deckle Boosts Coating Productivity Simplified mechanisms for Nordson EPC die streamline the adjustment of coating width while reducing the size of edge bead