INDUSTRY COMPONENT

Die Lip

Die lip is the final shaping component in annular extrusion dies that controls polymer flow and determines product dimensions.

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Component Specifications

Definition
The die lip is a precisely machined component located at the exit of an annular extrusion die, forming the final gap through which molten polymer flows to create tubular products like pipes, hoses, or blown film. It consists of inner and outer lips that define the annular gap geometry, with adjustable mechanisms for controlling wall thickness uniformity and product dimensions.
Working Principle
The die lip controls polymer melt flow by creating a defined annular gap between inner and outer surfaces. As molten polymer passes through this gap, the lip geometry determines the final product dimensions, wall thickness, and surface finish. Adjustable die lips allow operators to fine-tune gap dimensions during operation to maintain consistent product specifications.
Materials
Tool steel (D2, H13), stainless steel (420, 440C), or hardened alloys with chrome plating or nitriding for wear resistance and corrosion protection.
Technical Parameters
  • Hardness 50-60 HRC
  • Gap Range 0.5-20 mm
  • Surface Finish Ra 0.2-0.8 μm
  • Temperature Range 150-300°C
  • Concentricity Tolerance ±0.05 mm
Standards
ISO 12162, DIN 16774

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Die Lip.

extrusion die lip annular die component polymer processing equipment pipe manufacturing tooling blown film die plastic extrusion parts Die Lip Die Lip in Rubber and Plastic Product 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
  • Material buildup causing flow restrictions
  • Thermal expansion affecting gap dimensions
  • Wear leading to dimensional inaccuracies
  • Corrosion from aggressive polymers
FMEA Triads
Trigger: Insufficient hardness or improper material selection
Failure: Premature wear and dimensional drift
Mitigation: Use hardened tool steels with appropriate surface treatments and implement regular dimensional inspections
Trigger: Thermal cycling without proper compensation
Failure: Gap dimension variations during operation
Mitigation: Implement temperature control systems and use materials with low thermal expansion coefficients

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.02 mm for gap dimensions, ±0.05 mm for concentricity
Test Method
Coordinate measuring machine (CMM) inspection, optical comparators, go/no-go gauges

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the purpose of adjustable die lips?

Adjustable die lips allow operators to fine-tune the annular gap during operation to compensate for material variations, maintain consistent wall thickness, and correct dimensional deviations without stopping production.

How does die lip wear affect product quality?

Worn die lips cause inconsistent gap dimensions, leading to variations in wall thickness, surface defects, and dimensional inaccuracies in the final product, requiring regular inspection and maintenance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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