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How to Choose Bimetallic Twin Screw Barrels for ZSK Extruders?

2025-07-08

In ZSK co-rotating twin screw extruders, bimetallic barrels are one of the most critical wear parts. Choosing the right barrel improves dispersion, shear performance, and overall extrusion efficiency, while significantly extending service life.

1. Identify Your Application

Material type defines the barrel lining material:

Plastic compounding / masterbatch: Cr26 or WR13 linings for high filler wear resistance.
Biodegradable materials (PLA, PBAT, PBS): Nickel-based or SAM26 for anti-acid corrosion.
Food or medical grade: 316L or pollution-free linings to meet safety regulations.
Engineering plastics: Heat- and corrosion-resistant bimetallic barrels are ideal.

2. Confirm Key Specifications

Center Distance: ZSK typically uses 58.5 mm; precision match is essential.
Barrel Type: Closed, venting, side feeder, or combi-barrel must suit process needs.
With or Without Liner: Most ZSK barrels use liners to enhance durability.

3. Recommended Material Selection

Application Type	Recommended Lining	Key Features
High-wear filler	Cr26, WR13	High hardness, abrasion resistant
Corrosive materials	SAM26, Nickel alloy, 316L	Acid-resistant, durable
General engineering plastics	Cr12MoV, 38CrMoAla	Good heat treatment, impact resistance
Food-grade extrusion	316L, lead-free alloy	Safe, FDA compliant

4. FAQ

Q1: Can it replace original ZSK barrels?
A: Yes. With matching center distance and hole diameter, it can fully replace ZSK70, ZSK92, etc.

Q2: What’s the typical service life?
A: Depending on material, up to 1–2 years for high-wear-resistant barrels.

Q3: Are screw elements also available?
A: Yes, ZHITIAN offers full spare parts including screws, shafts, and gearboxes for ZSK machines.

Nanjing Zhitian Mechanical And Electrical Co., Ltd.

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How to Choose Bimetallic Twin Screw Barrels for ZSK Extruders?

In ZSK co-rotating twin screw extruders, bimetallic barrels are one of the most critical wear parts. Choosing the right barrel improves dispersion, shear performance, and overall extrusion efficiency, while significantly extending service life.

1. Identify Your Application

Material type defines the barrel lining material:

Plastic compounding / masterbatch: Cr26 or WR13 linings for high filler wear resistance.

Biodegradable materials (PLA, PBAT, PBS): Nickel-based or SAM26 for anti-acid corrosion.

Food or medical grade: 316L or pollution-free linings to meet safety regulations.

Engineering plastics: Heat- and corrosion-resistant bimetallic barrels are ideal.

2. Confirm Key Specifications

Center Distance: ZSK typically uses 58.5 mm; precision match is essential.

Barrel Type: Closed, venting, side feeder, or combi-barrel must suit process needs.

With or Without Liner: Most ZSK barrels use liners to enhance durability.

3. Recommended Material Selection

Application Type

Recommended Lining

Key Features

High-wear filler

Cr26, WR13

High hardness, abrasion resistant

Corrosive materials

SAM26, Nickel alloy, 316L

Acid-resistant, durable

General engineering plastics

Cr12MoV, 38CrMoAla

Good heat treatment, impact resistance

Food-grade extrusion

316L, lead-free alloy

Safe, FDA compliant