News

A parallel twin screw extruder has two constant-diameter intermeshing screws built from modular elements. Most are co-rotating, running at high speed for intensive mixing — which makes them the standard machine for compounding, masterbatch, WPC and pelletizing. Unlike a conical machine, the screw profile can be rebuilt for each new formulation.

A single screw barrel is one screw rotating inside a heated cylindrical barrel, conveying, melting and pumping plastic through a die. Performance is set mainly by three things: L/D ratio, compression ratio and screw type (standard, barrier or mixing). It is the most economical choice for high-output extrusion of uniform material — film blowing, pipe from pellets, sheet and granulation.

A twin screw extruder uses two intermeshing screws inside a twin-bore barrel to feed, melt, mix and pump plastic through a die. The two main families are conical (tapered screws, best for direct PVC pipe, profile and board extrusion) and parallel (constant-diameter, segmented screws, best for compounding, granulation and high-filler mixing).

A parallel twin screw barrel has two intermeshing screws of constant diameter running side by side in a matching twin-bore barrel. Unlike a conical barrel, the screws stay the same size end to end, and the barrel is usually built from segments. Co-rotating parallel screws suit compounding, granulation and masterbatch; counter-rotating parallel screws suit PVC and high-filler work.

PVC pipe, board and sheet all run on a conical twin screw barrel, but the right one differs in screw profile, output and — most of all — wear protection. Pipe favours steady output and pressure; foam board and sheet run higher filler and need stronger abrasion resistance. Get the size to match your extruder, then choose nitrided or bimetallic based on how much filler your formula carries.

A conical twin screw extruder is a PVC-focused extrusion machine with two tapered, intermeshing screws — wide at the feed end, narrow at the die end. The conical geometry gives high torque and strong compression in a compact length, making it the standard machine for PVC pipe, profile, board and WPC production.