+86-13505809643 Email Us
Parallel twin screw for aluminum-plastic panel production View full size

Parallel twin screw for aluminum-plastic composite

Parallel Twin Screw Barrel for Compounding and Pelletizing

Parallel twin screw barrels are manufactured in common sizes from Φ60 to Φ150 mm, with general L/D ratios from 20 to 30 and reference models including NHY75, NHY90, NHY110, NHY120 and NHY130. Material, surface treatment and alloy options can be reviewed according to the processed material, filler content, wear requirements and working conditions. Custom manufacturing and technical matching are supported based on machine models, drawings, photos, samples or measured dimensions. Final specifications and model performance should be confirmed according to the equipment configuration, material formulation and production requirements.

Quality

Quality Checked

Response

Technical Support

Pricing

Factory Direct

Warranty

Warranty by Order

Inquire on WhatsApp Request a Quote

Product Overview

Parallel twin screw barrels are commonly used in plastic compounding, pelletizing, plastic recycling extrusion, masterbatch production and filled material processing. Compared with general extrusion applications, these working conditions often involve higher mixing demand, material friction, filler content and wear requirements.

Nanhaiya manufactures custom parallel twin screw barrels according to machine model, drawings, samples or measured dimensions. The screw barrel design can be reviewed based on processed material, screw diameter, L/D ratio, output requirement, wear condition, filler content and extrusion application.

Our engineering team can review extruder information, screw barrel photos, drawings, samples or measured dimensions to support quotation and technical evaluation. Whether the application involves plastic compounding, pelletizing, recycling extrusion or filled materials, the final screw and barrel design should be matched to the equipment, material formulation and working conditions.

Full Technical Specifications

Parameter Value
Product Type Parallel twin screw and barrel for plastic extrusion
Screw Diameter Range Φ60–Φ150 mm
General L/D Ratio 20–30
Standard Material 38CrMoAlA
Heat Treatment Hardness HB260–320
Nitriding Hardness HV950–1000
Nitriding Depth 0.50–0.70 mm
Nitriding Brittleness ≤ Grade 2
Surface Roughness Ra0.4
Screw Straightness 0.015 mm
Chrome Plating Hardness ≥950 HV, where applicable
Chrome Plating Thickness 0.05–0.10 mm, where applicable
Bimetallic Layer Depth 1.0–2.0 mm, where applicable
Bimetallic Hardness HRC56–65, where applicable
Optional Hot-Work Tool Steels 1.2344, H13, W360 and SKD61
Optional Cold-Work Tool Steels 1.2379, K340, D2, DC53, SKD11 and W110
Optional High-Speed Steels 1.3343, 1.3243, SKH51 and SKH55
Optional HIP Powder High-Speed Steels CPM9V, SK739, SK726, SK742 and GH113
Optional PTA Alloy Types Cobalt-based, nickel-based or iron-based alloy, selected according to the application
Barrel Alloy Layer Options Cobalt-based, nickel-based or iron-based alloy for the barrel inner bore, where applicable
Machine Matching Confirmed according to machine model, drawings, samples or measured dimensions
Final Specification Note Final specifications should be confirmed according to machine model, processed material, output requirement and working conditions.

Final specifications should be confirmed by Nanhaiya engineering before production.

Common Parallel Twin Screw Models

The following catalog data is provided for common reference models. Final output, motor power and operating parameters should be confirmed according to the processed material, formulation, equipment configuration and working conditions.

Model L/D Ratio PVC Output Rotation Speed Motor Power Screw Diameter
NHY75 26–36 220–350 kg/h 45 rpm 45 kW 75 mm
NHY90 26–36 280–460 kg/h 45 rpm 55 kW 90 mm
NHY110 26–36 350–650 kg/h 45 rpm 75 kW 110 mm
NHY120 26–36 500–800 kg/h 45 rpm 110 kW 120 mm
NHY130 26–36 680–1000 kg/h 45 rpm 132 kW 130 mm

Suitable Applications

This product is commonly used for the following applications, depending on material, machine model and processing conditions. Explore related applications on our Screw Barrel Applications page.

PVC pipe extrusion
PVC profile extrusion
WPC extrusion
PVC board / sheet extrusion
Plastic granulation
Compounding
Modified plastics / filled compounds

Common Processing Issues

1

High wear from filled materials: Fillers such as calcium carbonate, glass fiber, mineral powder or recycled material impurities may increase screw and barrel wear.

2

Unstable pelletizing output: Output fluctuation may be related to screw barrel wear, feeding condition, material formulation, temperature control or screw design mismatch.

3

Poor mixing or dispersion: Uneven mixing, color dispersion problems or unstable compound quality may require screw barrel and screw element review.

4

Pressure instability: Barrel wear, screw clearance, material condition or machine settings can affect extrusion pressure stability.

5

Specification confirmation: When original drawings are unavailable, machine information, photos, samples and measured dimensions can support specification review and manufacturing confirmation.

Material Options

Nanhaiya manufactures parallel twin screw barrel components from the following materials:

38CrMoAlA Nitrided Steel (Standard)

The commonly used material for parallel twin screw barrels. After heat treatment, the core hardness reaches HB260-320. Nitriding treatment achieves a surface hardness of HV950-1000 with a nitriding depth of 0.50-0.7mm and nitriding brittleness of ≤ grade 2. Suitable for general-purpose extrusion of PVC, PP, PE and ABS, depending on processed material and working conditions.

Hot Processed Steel

Special steel options for screw components requiring high hot hardness: 1.2344, H13, W360 and SKD61. Can be designed for applications involving high processing temperatures, depending on processed material and working conditions.

Cold Processed Steel

Tool steel grades for components requiring high wear resistance: 1.2379, K340, D2, DC53, SKD11 and W110. Can be used for screw elements and barrel components in abrasive processing applications, depending on filler content and working conditions.

High-Speed Steel (HSS)

Grades available: 1.3343, 1.3243, SKH51 and SKH55. Can be designed for demanding wear applications, depending on processed material and screw design.

HIP Powder HSS

Advanced powder metallurgy grades: CPM9V, SK739, SK726, SK742 and GH113. Can be designed for highly abrasive and corrosive applications, depending on filler type, loading and working conditions.

Bimetallic Parallel Twin Screw Barrel (Optional)

For higher wear-resistance requirements, a bimetallic parallel twin screw barrel with alloy layer is available. Bimetal depth is 1.0-2.0mm with bimetal hardness of HRC56-65. The barrel alloy layer can use centrifugal casting alloy inner bore and shrinkage fit technology. Alloy barrel options can be discussed according to processed material, filler content and working conditions.

Final material selection should be confirmed depending on processed material, filler content, screw design, extruder model and working conditions.

Surface Treatment Options

Nitriding Treatment (Standard)

The standard surface treatment for Nanhaiya parallel twin screw barrels. Gas nitriding produces a surface hardness of HV950-1000 with a nitriding depth of 0.50-0.7mm and nitriding brittleness of ≤ grade 2. Surface roughness achieves Ra0.4. Suitable for general-purpose extrusion of PVC, PP, PE and other common thermoplastics.

Hard Chrome Plating

Electroplated chromium layer with a hardness of ≥950HV and thickness of 0.05-0.10mm. Chrome plating provides corrosion resistance and a smooth surface for material flow. Can be used for processing corrosive polymers, depending on processed material and working conditions.

PTA Alloy Welding

The screw flight top can use PTA (Plasma Transferred Arc) alloy welding. Alloy types include cobalt-base, nickel-base and iron-base alloys. PTA alloy welding can be designed for abrasive and corrosive applications, depending on filler type, loading and working conditions.

Stellite Plasma Alloy Welding

Stellite plasma alloy welding can be applied to screw flight surfaces for enhanced wear and corrosion resistance. Cobalt-base Stellite alloy provides high hardness and oxidation resistance. Can be designed for glass-fiber-filled and highly abrasive compounds, depending on processed material and working conditions.

Centrifugal Casting Alloy Barrel

For barrel inner surfaces, a centrifugal casting alloy inner bore with shrinkage fit technology can be applied. This produces a bimetallic barrel with alloy depth of 1.0-2.0mm and hardness of HRC56-65. The centrifugal casting process ensures uniform alloy distribution. Alloy barrel options can be discussed according to processed material, filler content and working conditions.

Final surface treatment selection should be confirmed depending on processed material, filler content, screw design, extruder model and working conditions. For more details, see our alloy spray welding service page.

Customization Options

Nanhaiya offers customization for parallel twin screw barrel to match your specific equipment and production requirements. Each custom twin screw barrel can be designed according to processed material, application, output requirement and extruder model.

What Can Be Customized

  • Screw diameter and L/D ratio — Within the Φ60-Φ150mm and 1:20-30 range, depending on extruder model and output requirement.
  • Material selection — 38CrMoAlA standard, or special steel options including hot processed, cold processed, HSS and HIP powder HSS grades, depending on processed material and working conditions.
  • Surface and alloy treatment — Nitriding, chrome plating, PTA alloy welding, Stellite plasma alloy welding or centrifugal casting alloy barrel, depending on filler content and wear requirements.
  • Screw flight alloy welding — Screw flight top can use PTA alloy welding or Stellite plasma alloy welding with cobalt-base, nickel-base or iron-base alloys.
  • Barrel alloy layer — Centrifugal casting alloy inner bore with shrinkage fit technology for bimetallic barrel configurations.

Custom Manufacturing and Machine Matching

Custom manufacturing can be reviewed based on machine models, drawings, photos, samples or measured dimensions. If original drawings are unavailable, our engineering team can evaluate the available equipment information and physical references to confirm manufacturing feasibility and technical details.

Final specifications should be confirmed depending on processed material, filler content, screw design, extruder model and working conditions. For custom twin screw barrel design inquiries, contact our engineering team or visit our custom screw design service page.

What Information Do We Need for Quotation?

To provide an accurate quotation for parallel twin screws, please share the following information:

  • Extruder type and machine model
  • Screw diameter, barrel dimensions and L/D ratio if available
  • Processed material, such as PP, PE, ABS, recycled plastic, masterbatch or filled compound
  • Application, such as compounding, pelletizing, recycling extrusion or masterbatch production
  • Current production issue, wear condition or required specification
  • Drawings, samples, measured dimensions or screw barrel photos

Our team will review the information and follow up with pricing, manufacturing feasibility and technical support.

Parallel Twin Screw Barrel FAQ

What is a parallel twin screw barrel used for?
A parallel twin screw barrel is commonly used in plastic compounding, pelletizing, recycling extrusion, masterbatch production, filled material processing and related twin screw extrusion applications.
Can you manufacture a parallel twin screw barrel according to an existing machine or sample?
Yes. Nanhaiya can manufacture parallel twin screw barrels according to machine models, drawings, samples, photos or measured dimensions.
What information is needed for a parallel twin screw barrel quotation?
Please provide the extruder model, screw diameter, barrel dimensions, processed material, application, wear condition and any available drawings, photos, samples or measured dimensions.
Can the screw barrel be customized for filled or abrasive materials?
Yes. The screw barrel design, material selection and surface treatment can be reviewed according to the processed material, filler content, wear condition, output requirement and working conditions.
Do you provide parallel twin screw barrels for compounding and pelletizing?
Yes. Parallel twin screw barrels can be produced for compounding, pelletizing, recycling extrusion, masterbatch production and related twin screw extrusion equipment based on machine and application requirements.
More technical FAQs (1)
Can you support projects without original drawings?
Yes. If original drawings are unavailable, machine information, photos, samples and measured dimensions can help our engineering team review the required specification and confirm manufacturing feasibility.

Request a Parallel Twin Screw Barrel Quote

Send your machine model, processed material, application, drawings, photos or measured dimensions. Nanhaiya can review your parallel twin screw barrel requirements and support custom manufacturing, engineering evaluation and quotation.

Chat on WhatsApp Send Inquiry

Or email us directly at info@nhyscrew.com