Injection Molding Screw Barrel
Screw barrels for injection molding machines including general purpose screws, barrier screws and mixing screws.
Plastic Processing Screw Barrel Technology
Screw Barrel Solutions for Plastic Processing Industry
High Performance Screw and Barrel Systems for Injection Molding, Extrusion, Blow Molding and Recycling Applications
Engineered plasticizing components manufactured to international standards, supported by full metallurgical documentation and technical evaluation for every application.
- 20+
- Years Engineering
- Ø15–300 mm
- Diameter Range
- HV 900–1000
- Nitrided Hardness
- 60+
- Countries Served
Applications
Screw Barrel Solutions By Machine Type
Application-specific plasticizing systems
Extrusion Screw Barrel
Single screw and twin screw solutions for pipes, profiles, sheets and films.
Blow Molding Screw Barrel
Plasticizing solutions for extrusion blow molding applications.
Recycling Screw Barrel
Wear-resistant screw barrel systems for plastic recycling.
Product Range
Screw Barrel Types
Geometry selected against polymer, output and process window
Single Screw Barrel
The standard plasticizing unit for injection molding and single screw extrusion lines.
Twin Screw Barrel
Parallel and conical twin systems for PVC compounding, profiles and high-output lines.
Barrier Screw
Separated solid and melt channels for higher output with lower melt temperature.
Mixing Screw
Maddock, pineapple and pin mixing sections for colour and additive homogeneity.
Special Application Screw
Vented, foaming, PET and custom geometries engineered to drawing.
Metallurgy
Screw Barrel Materials & Surface Treatment
Material selection determines wear resistance, service life and corrosion resistance
Every screw barrel is specified with a defined base material and surface treatment matched to the polymer, filler content and processing temperature. The correct combination extends service life by several times compared with a generic specification.
38CrMoAlA Nitrided Steel
Deep nitrided layer of 0.5-0.8 mm with surface hardness HV 900-1000. The reference standard for unfilled thermoplastics.
Bimetallic Alloy
Centrifugally cast Ni/Fe base alloy liner with tungsten and chromium carbides for glass fibre filled and abrasive compounds.
Tungsten Carbide
HVOF and overlay carbide coatings for extreme abrasion, high filler loading and long-run recycling duty.
Corrosion Resistant Materials
Nickel-based and duplex alloys for PVC, fluoropolymers and flame-retardant systems generating aggressive gases.
Engineering Knowledge
Engineering Knowledge Center
Screw barrel design fundamentals explained by our engineering team
Screw Diameter Selection
Matching shot weight, output and residence time to the correct screw diameter.
L/D Ratio Explained
How length to diameter ratio governs melting capacity and thermal homogeneity.
Compression Ratio
Calculating compression ratio and matching it to polymer bulk density.
Feeding Zone
Solids conveying, groove design and feed throat temperature control.
Compression Zone
Melting mechanism, solid bed breakup and channel depth transition.
Metering Zone
Pressure generation, output stability and melt temperature control.
Screw Wear Analysis
Diagnosing adhesive, abrasive and corrosive wear from measurement data.
By Polymer
Plastic Material Solutions
Screw barrel specification by polymer
PP Screw Barrel
Barrier geometry with moderate compression for polypropylene homopolymer and copolymer.
PE Screw Barrel
Deep flighted designs for HDPE, LDPE and LLDPE film and pipe extrusion.
PVC Screw Barrel
Low shear geometry with corrosion resistant surfaces for rigid and flexible PVC.
PET Screw Barrel
Low compression, high L/D designs limiting hydrolytic and thermal degradation.
ABS Screw Barrel
Balanced shear input for ABS and PC/ABS blends with high surface quality demands.
PA Screw Barrel
Sharp melting transition designs for polyamide and glass fibre reinforced grades.
Manufacturing
Manufacturing Process
Full in-house process control from bar stock to final inspection
- 01
Raw Material
Certified 38CrMoAlA, 42CrMo and alloy steel bar with mill test certificates.
- 02
Machining
CNC turning and whirling of flight geometry to drawing tolerance.
- 03
Heat Treatment
Quenching and tempering to achieve core strength and dimensional stability.
- 04
Nitriding
Gas nitriding to 0.5-0.8 mm depth, HV 900-1000 surface hardness.
- 05
Bimetallic Processing
Centrifugal casting of alloy liners for abrasion and corrosion duty.
- 06
Grinding
Precision OD and bore grinding with straightness correction.
- 07
Inspection
Hardness, layer depth, straightness and dimensional report for every unit.
Case Studies
Engineering Case Studies
Measured results from production line interventions
Low Output Improvement
- Industry
- Automotive Components
- Machine Type
- 180T Injection Molding Machine
- Previous Problem
- Plasticizing time of 14 s limited cycle time and created unmelts in glass filled PP.
- Solution
- Replaced general purpose screw with a barrier screw plus Maddock mixing section, L/D increased from 18 to 22.
Result
Plasticizing time reduced to 8.5 s, cycle time down 18 percent, unmelts eliminated.
Screw Wear Reduction
- Industry
- Plastic Pipe Extrusion
- Machine Type
- Single Screw Extruder SJ90
- Previous Problem
- Nitrided screw lost 0.9 mm of flight diameter within 9 months on 30 percent CaCO3 filled compound.
- Solution
- Converted to bimetallic barrel liner with tungsten carbide overlay on the flight lands.
Result
Measured wear after 24 months below 0.15 mm, service life extended more than three times.
Plasticizing Stability Improvement
- Industry
- PET Preform Production
- Machine Type
- Preform Injection System
- Previous Problem
- Melt temperature drift of 12 C and visible AA level variation between shots.
- Solution
- Low compression PET geometry with extended metering zone and revised barrel heating profile.
Result
Melt temperature deviation held within 3 C, shot weight variation reduced to 0.4 percent.
Knowledge Base
FAQ Knowledge Base
Common technical questions answered by our engineers
A screw barrel is the plasticizing unit of a plastic processing machine. The rotating screw conveys polymer granules forward inside a heated barrel, where shear and conduction melt the material before it is metered into the mold or die. Its geometry and metallurgy determine melt quality, output and energy consumption.
Need A Custom Screw Barrel Solution?
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