65mm Twin Screw Barrel and Screw Element Set for PET Sheet Extrusion

65mm Twin Screw Barrel and Screw Element Set for PET Sheet Extrusion

This 65mm twin screw barrel and screw element set is designed for PET sheet extrusion lines that require matched replacement components rather than purchasing the barrel and screw elements separately.

The configuration is based on a Model 65 twin screw system with a Φ63 mm barrel bore and 52 mm center distance. The original product configuration combines an overall-lined barrel structure with W6Mo5Cr4V2 (6542) screw elements and can include closed, feeding, venting and combination barrel sections.

By evaluating the barrel and screw elements as one working system, the replacement set helps maintain correct geometry, assembly compatibility and screw-to-barrel clearance.

Typical problems it can address include:

• Barrel and screw elements purchased from different sources do not match correctly
• Excessive clearance after replacing only worn screw elements
• New barrel installed with heavily worn existing screws
• Incorrect spline or screw-element dimensions
• Venting barrel dimensions that do not match the existing PET line
• Difficulty reproducing an older extrusion configuration

Key Specifications

The existing product page lists these key Model 65 dimensions and identifies the product as an overall-lined barrel combined with 6542 screw elements.

Why Replace the Barrel and Screw Elements as a Matched Set?

The barrel bore and screw elements work together to create the actual processing clearance inside a twin screw extruder.

During long-term production, both components gradually wear.

If only the screw elements are replaced while the barrel bore is already oversized, the new screws may still operate with excessive clearance.

Likewise, installing a new barrel while continuing to use severely worn screw elements may not restore the original working condition.

For PET sheet extrusion, incorrect working clearance can contribute to:

• Material backflow
• Reduced conveying efficiency
• Unstable pressure
• Changes in filling behavior
• Lower process repeatability

For heavily worn systems, evaluating the barrel and screw elements together provides a better basis for replacement.

Overall-Lined Barrel for Wear Protection

The barrel configuration uses a structural steel body combined with an overall liner.

This construction allows the working bore material to be selected according to the actual process condition while the outer barrel body provides structural support.

The current page also lists multiple liner and barrel-material options for wear, corrosion and combined wear-corrosion conditions.

For PET processing, material selection should consider:

• Recycled PET contamination level
• Fillers or additives
• Processing temperature
• Existing barrel wear pattern
• Required service life
• Cleaning and operating conditions

The liner should therefore be selected according to actual failure conditions rather than only hardness.

W6Mo5Cr4V2 Screw Elements

W6Mo5Cr4V2, commonly referred to as 6542, is used for the screw elements in the current configuration.

Replacement screw elements can be manufactured according to the existing screw arrangement, including:

• Conveying elements
• Kneading elements
• Reverse elements
• Transition elements
• Customized screw profiles

Important dimensions include outside diameter, element length, pitch, internal spline and connection with adjacent screw elements.

For replacement projects, both the external working profile and internal shaft connection must match the existing equipment.

Barrel Sections for PET Sheet Extrusion

PET sheet extrusion may require more than a standard closed barrel.

Depending on the machine configuration, barrel sections can include:

• Feeding barrel
• Closed processing barrel
• Venting barrel
• Vacuum venting section
• Combination barrel
• Customized process section

The existing page specifically identifies venting and combination barrels for PET sheet extrusion.

For PET processing, venting sections are particularly important when the process requires removal of moisture or volatile components.

Replacement venting barrels should therefore match not only the bore and center distance but also the vent opening, mounting interface and surrounding barrel sections.

Accurate Replacement from Drawing or Sample

The barrel and screw element set can be reproduced according to:

• Original technical drawings
• Existing barrel samples
• Existing screw-element samples
• Measured dimensions
• Complete screw configuration

Critical barrel dimensions include:

• Φ63 mm bore
• 52 mm center distance
• Barrel length
• Connection faces
• Bolt-hole positions
• Vent opening
• Heating and cooling interfaces

For screw elements, the spline, pitch, profile and total assembled length should also be confirmed.

When worn components are used as samples, service wear should be separated from the original design dimensions before manufacturing.

Manufacturing and Inspection

Inspection can include:

• Barrel bore dimensions
• Center distance
• Barrel interface dimensions
• Screw-element outside diameter
• Internal spline
• Element length and profile
• Material verification
• Cooling-channel sealing
• Assembly compatibility

Dimensional data can be retained after confirmation to simplify future repeat replacement orders.

Information Required for Evaluation

Please provide:

1. Extruder model
2. Barrel drawing or sample
3. Screw-element drawing or sample
4. Complete screw configuration, if available
5. PET material type
6. Virgin or recycled PET
7. Current wear condition
8. Existing barrel and screw materials
9. Venting configuration
10. Required quantity

FAQ

Can the barrel and screw elements be ordered together?
Yes. This page is specifically positioned as a matched replacement set.

Is the bore diameter 65 mm?
The current Model 65 configuration uses a Φ63 mm bore and 52 mm center distance.

Can only the worn components be replaced?
Yes, but the remaining barrel and screw components should be inspected to ensure the working clearance remains acceptable.

Can the material be upgraded?
Yes. Barrel liner and screw-element materials can be reconsidered according to actual wear, corrosion and PET processing conditions.

Send us your barrel drawing, screw-element samples or existing dimensions. We can evaluate whether the barrel and screws should be replaced together and confirm the critical dimensions before manufacturing.

Send Your PET Extruder Barrel and Screw Data for Technical Review