> News > Industry News

Industry News

Extrusion screw compression ratio: calculation, selection and troubleshooting

Extrusion screw compression ratio describes the reduction in channel volume from the feed section to the metering section. On a conventional screw with comparable pitch and channel geometry, feed channel depth divided by metering channel depth gives a useful approximation. Choose a replacement from ......

How long does an extruder screw barrel last? Measuring wear and planning replacement

An extruder screw barrel lasts as long as its condition lets the line meet the required output and product quality within an acceptable process window. Resin, fillers, contamination, geometry and operating load change that service life, so a calendar-age estimate needs those conditions attached. For......

Extruder screw and barrel materials: steel grades, alloys and selection

Choose screw and barrel materials by matching the structural steel, working surface and manufacturing process to the actual formulation and failure mechanism. A higher hardness number alone cannot tell you whether a replacement will resist filler abrasion, chemical attack or metal contact; specify t......

Twin screw shaft splines: define the interface before ordering elements

Define the shaft and element bore as a matched interface. Start with the controlled machine or part drawing. Record the spline designation when known, tooth count, major and minor geometry, tooth or space definition, engagement length, lead-in, shoulder, axial retention and orientation from a declar......

Twin screw extruder shutdown: preserve the evidence before teardown

Treat the teardown as a controlled data-capture job. Before stopping, save the stable operating condition and the reason for opening the machine. Before removal, mark feed direction, viewing direction, left and right shafts, barrel-section order and every connection. Photograph deposits before clean......

Twin screw barrel clearance: measure the system, not one diameter

Measure the barrel and both screws at matching axial stations. Record the datum, feed direction, left and right side, angular orientation, temperature and tool used. Keep barrel bore diameter, screw outside diameter, screw-to-barrel clearance, screw-to-screw clearance and shaft center distance as se......

<...7 8 9 10 11...17 >