Screw barrel clearance is a critical factor in extrusion performance. It is the gap between the screw flight and the barrel inner surface. When this clearance becomes too large due to wear, molten plastic can flow backward over the screw flights. The result may be lower output, unstable melt pressure and higher screw RPM. Common warning signs include reduced kg/h, difficulty building pressure and declining product consistency. For replacement projects,

Extruder screw and barrel wear is one of the most common causes of declining performance in plastic extrusion lines. A machine may continue running, but operators gradually notice lower output, unstable pressure, higher screw RPM or inconsistent melt quality. Because this deterioration often develops slowly, the screw and barrel may not immediately be suspected. In many cases, the real problem is increasing clearance between the screw flights and the barrel

A decrease in extruder screw output is a common problem in plastic extrusion. A production line that previously produced 300 kg/h may gradually fall to 250 kg/h or even lower under similar operating conditions. The first reaction is often to replace the screw and barrel. However, low output does not always mean the screw is worn. Before ordering replacement parts, check these seven common causes. 1. Screw and Barrel Clearance

When purchasing a replacement screw and barrel, one common question is: Should I choose a nitrided screw barrel or a bimetallic screw barrel? There is no single answer for every application. The correct choice depends on the polymer, filler content, abrasion, corrosion, production conditions and expected service life. For standard plastics, a nitrided screw and barrel may provide good performance at a reasonable cost. For recycled, highly filled or abrasive

Choosing the right screw barrel for plastic extrusion has a direct impact on output, plasticizing quality, energy consumption, and service life. Many buyers focus only on screw diameter when ordering a replacement screw and barrel. However, diameter is only one part of the specification. At Juyuan, we manufacture screw barrels for different extrusion applications. Based on our experience, the following factors should be checked before manufacturing a replacement set. 1.

Extruder screw compression ratio is one of the most important parameters in plastic extrusion screw design, but it is also one of the most frequently misunderstood. When buyers ask us to manufacture a replacement screw, they sometimes provide only the screw diameter, length and compression ratio. For example: “Diameter 90 mm, L/D 30:1, compression ratio 3:1.” This information is useful, but it is not enough to determine whether the screw