Spiral Grooves: Groove Width 1.0-5.0 mm, Number of Grooves 4-12

Component Specifications

Definition

Spiral grooves are helical channels machined into the mandrel or body of an annular die, designed to evenly distribute molten polymer around the circumference before it exits through the die gap. They ensure uniform flow, pressure, and temperature distribution, critical for producing consistent cross-sectional profiles in extruded products like pipes, tubes, and films.

Working Principle

The spiral grooves utilize a helical flow path to split and recombine the polymer melt multiple times, balancing pressure and eliminating flow irregularities. As the melt travels through the grooves, it undergoes shear thinning and thermal homogenization, resulting in a uniform annular flow at the die exit.

Materials

Typically made from high-grade tool steels (e.g., H13, D2) or carbide alloys, hardened to 48-52 HRC for wear resistance. Coatings like chromium nitride (CrN) or titanium nitride (TiN) may be applied to reduce friction and corrosion.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Helix Angle	30-60 degrees
Groove Depth	0.5-3.0 mm
Groove Width	1.0-5.0 mm
Surface Finish	Ra 0.2-0.4 μm
Number Of Grooves	4-12

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, DIN 16780

Engineering Analysis

Risks & Mitigation

Groove clogging due to polymer degradation
Uneven wear leading to flow imbalance
Thermal stress cracking in high-temperature operations

FMEA Triads

Trigger: Insufficient cleaning or material contamination
Failure: Partial or complete blockage of grooves
Mitigation: Implement regular maintenance schedules and use purging compounds between material changes.

Trigger: Abrasive polymer compounds or filler materials
Failure: Accelerated wear and loss of groove geometry
Mitigation: Use wear-resistant materials or coatings and monitor extrusion parameters for signs of wear.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm on groove dimensions, concentricity within 0.01 mm

Test Method

Coordinate measuring machine (CMM) inspection, flow simulation software analysis

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Spiral Grooves

Manufacturer profiles associated with Spiral Grooves.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of spiral grooves in an annular die?

The primary function is to distribute molten polymer evenly around the die circumference, ensuring uniform wall thickness and consistent product quality in extruded items like pipes.

How do spiral grooves affect extrusion pressure?

They help balance and reduce pressure variations by creating multiple flow paths, which minimizes defects such as weld lines and improves processing stability.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Spiral Grooves