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What is a parallel twin screw barrel?

A parallel twin screw barrel contains two screws whose centerlines remain parallel through the process section. The screw outside diameters and center distance do not taper from the drive end to the discharge end. Parallel systems may be co-rotating or counter-rotating, and their process sections ma......

Twin screw barrel problems: what to inspect before replacing parts

Do not order twin screw parts from a torque alarm or worn-looking photograph alone. Preserve the screw element sequence, measure every barrel section by position, inspect the shaft and drive connection, and compare operating data under the same recipe and settings. Use the machine maker's limits for......

Co-rotating vs counter-rotating twin screws

Co-rotating screws turn in the same direction; counter-rotating screws turn in opposite directions. For a replacement order, rotation is a fixed machine input. Confirm it from the gearbox output, screw hand and original drawings before discussing diameter, material or surface treatment.

Cable Extrusion Screw Barrels: The Compound Decides Everything

In most extrusion, a gel or an unmelted particle is a quality complaint. In a cable extrusion screw barrel, it is a weak point in a dielectric that will sit in a wall or a duct for thirty years. That difference in consequence is what drives the whole specification.

Blow Moulding vs Blown Film Screw Barrels: Which One Are You Buying?

Roughly once a month an inquiry arrives asking for a blow moulding screw barrel, and the photographs attached show a blown film line. The names sit next to each other in every catalogue, including ours. The processes have almost nothing in common.

L/D Ratio and Compression Ratio: What the Numbers Don't Tell You

A customer sends a drawing marked 30:1, compression 3:1, and asks us to copy it. Nine times out of ten we do exactly that. The tenth time, we ask what they feed the machine — and the answer explains the problem they have been living with for two years.

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