INDUSTRY COMPONENT

Spiral Grooves

Spiral grooves are precision-engineered channels in annular dies that distribute polymer melt uniformly for consistent extrusion.

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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
  • 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
Standards
ISO 9001, DIN 16780

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spiral Grooves.

spiral grooves annular die extrusion die polymer flow uniform extrusion die design helical channels extrusion technology Spiral Grooves in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Annular Die

A critical component in plastic film blowing machines that shapes molten plastic into a continuous tubular film.

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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

Interchangeable Parts

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

Buyer Feedback

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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