> News

News

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.

Screw Barrel Quality Inspection: What to Check Before You Pay

To verify a screw barrel before you pay, check three things: dimensions, materials and surface. Require an inspection report with the actual measured dimensions of your parts (not the design values), a material certificate with chemistry and heat number, and the surface treatment with its measured d......

Screw Mixers Explained: Maddock vs Pineapple vs Saxton

A mixing element is a section machined into an extruder screw that makes the melt more uniform. The three most common are the Maddock (high-shear, dispersive — breaks down unmelt and agglomerates), the Pineapple (low-shear, distributive — evens out colour and temperature), and the Saxton (distributi......

Single Screw vs Twin Screw Extruder Barrel: Which One Do You Need?

A single screw extruder barrel conveys and melts material with one screw, relying on friction against the barrel wall. It is simpler, more robust and more economical — the right choice for straightforward melting and shaping of most polymers and recycled plastics. A twin screw barrel uses two int......

How to Get an Accurate Screw Barrel Quote

To get an accurate screw barrel quote, send a drawing if you have one. If you don't, send product photos plus the major dimensions — diameter, length and flange information — together with the material you process and the surface treatment you want. With those details clear, EJS can usually make ......

What Steel Is Used for Screw Barrels? 38CrMoAlA, 42CrMo & 31CrMoV9 Explained

Screw barrels are made from alloy steels chosen for strength, hardenability, and how well they take a hardened surface. The most common are 38CrMoAlA (1.8509) and 34CrAlNi7 (1.8550) for nitrided parts, 42CrMo (4140) and 31CrMoV9 (1.8519) for through-hardened work, 40Cr for bimetallic barrels, and SS......

<1 2 3 4 5...19 >