A 150 mm screw and barrel is the core plasticising and conveying assembly inside a single-screw extruder. It consists of a helical metal screw shaft and a cylindrical barrel which together melt, mix, and push polymer materials (like PE, PP, PVC, PET, etc.) through a die for forming film, pipe, sheet, etc.
A 150 mm screw and barrel is the core plasticising and conveying assembly inside a single-screw extruder. It consists of a helical metal screw shaft and a cylindrical barrel which together melt, mix, and push polymer materials (like PE, PP, PVC, PET, etc.) through a die for forming film, pipe, sheet, etc.
Typical Product Specifications
Component
Typical Detail
Screw Diameter
150 mm — match to specific extruder frame size (e.g., 150 mm extrusion line)
Screw Type Options
Standard, barrier, mixing, Maddock vent, variable pitch, pin screw, etc. (varies by application)
Barrel Type
Bimetallic liner, chrome-plated, nitrided surface for wear resistance
Length/ Diameter (L/D) Ratio
Common ranges ~30:1 up to 35:1+ for film/pipe applications
Surface Hardness
Barrel surface typically nitrided to ≈ HRC56-65; bimetal alloy liner 2–3 mm depth
Straightness Tolerance
≈ 0.015 mm/m (high precision machining)
Materials
Screw/Barrel: alloy steels like 38CrMoAlA, SKD61; options for tungsten carbide or Ni-based liners for abrasive fillers
Surface Treatments
Nitriding, hard chrome plating, high-frequency heat treatment
Surface Roughness
Ra ≤ 0.4 μm (smooth surface reduces drag & wear)
Application Polymers
PE (LLDPE/HDPE/LDPE), PP, PVC, masterbatch compounds
These parameters can be customised by manufacturer depending on product type — film, pipe, profile, pelletising, or recycling lines.
Materials & Treatments
Base steel: 38CrMoAlA, SKD61, 42CrMo — high strength & toughness.
Bimetallic layer: tungsten or nickel-based for superior wear-resistance.
Surface treatment: nitriding and/or chrome plating for extended life under high temperature and abrasive use.
Typical Performance Context
In a 150 mm single-screw extruder line, this screw + barrel assembly might be part of a machine with these broader extruder specs:
L/D ratio: approx. 33:1 — balancing melt development and output
Motor power: often 250 – 315 kW range on large machines
Output: 300–1200 kg/h (varies with polymer & screw design)
These figures reflect how the screw + barrel relates to overall extruder capacity.
Applications
A 150 mm screw and barrel set like this is commonly used for:
✅ Film extrusion (blown film lines) ✅ Pipe/profile extrusion ✅ Pelletising and recycling machines ✅ Compounding extruders
Different screw geometries (mixing zones, barrier flights) can be chosen for specific materials or products.
Key Product Characteristics
High wear resistance (long service life) High precision and straightness Good heat distribution and melt homogeneity Customisable designs (depending on polymer type & output).
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