Die Lip: Gap Range 0.5-20 mm, Temperature Range 150-300°C

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

Parameter	Typical range	Notes & selection driver
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

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 12162, DIN 16774

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.

View Product Details

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

Typical Suppliers & Equivalents

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

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 Die Lip

Manufacturer profiles associated with Die Lip.

Sourcing Die Lip from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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

Related Components

Mold Release Coating

Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

Silicone polymer base is a high-temperature resistant polymer material used as the foundational component in silicone rubber compounds for industrial applications.

Reinforcing Filler

Reinforcing filler is a material added to silicone rubber compounds to enhance mechanical properties, thermal stability, and durability in high-temperature applications.

Processing Aids

Processing aids are specialized additives used to improve the manufacturability and performance of high-temperature silicone rubber compounds during industrial processing.

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.

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.

Die Lip