Tie Layer: Thickness Range 2-20 microns

Component Specifications

Definition

A tie layer is a specialized adhesive polymer layer used in multi-layer co-extruded barrier film manufacturing to create strong interfacial bonding between dissimilar polymer layers that would otherwise exhibit poor adhesion. This component enables the combination of materials with different properties (such as barrier, mechanical, or thermal characteristics) into a single functional film structure.

Working Principle

The tie layer functions through molecular compatibility and chemical bonding mechanisms. It contains functional groups (such as maleic anhydride, glycidyl methacrylate, or other reactive moieties) that chemically interact with both adjacent polymer layers. During co-extrusion, the tie layer melts and flows between the primary layers, forming covalent bonds, hydrogen bonds, or strong van der Waals forces at both interfaces to create permanent adhesion.

Materials

Typically composed of modified polyolefins (maleic anhydride grafted polyethylene or polypropylene), ethylene vinyl acetate (EVA) copolymers, ionomers, or specialty adhesive polymers. Material selection depends on the specific polymers being bonded and required bond strength.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Density	0.89-0.96 g/cm³
Bond Strength	>200 N/25mm
Melt Flow Index	1-10 g/10min
Thickness Range	2-20 microns
Processing Temperature	180-250°C

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 11357, ISO 527, ASTM D882, ASTM F88

Parent Products

This component is used in the following industrial products

Multi-Layer Co-Extruded Barrier Film

This product is a high-performance plastic film manufactured using co-extrusion technology to combine multiple polymer layers into a single sheet.

View Product Details

Multi-Layer Barrier Vacuum Pouch Seal Strip

Heat-sealable strip for creating hermetic seals on vacuum pouches for meat packaging.

View Product Details

Engineering Analysis

Risks & Mitigation

Insufficient bond strength leading to delamination
Chemical migration in food contact applications
Thermal degradation during processing
Incompatibility with recycling streams

FMEA Triads

Trigger: Incorrect tie layer material selection
Failure: Poor interlayer adhesion and delamination
Mitigation: Conduct compatibility testing and select tie layers with appropriate functional groups for specific polymer combinations

Trigger: Inadequate processing temperature control
Failure: Incomplete melting or thermal degradation of tie layer
Mitigation: Implement precise temperature profiling and real-time monitoring during co-extrusion

Trigger: Contamination at layer interfaces
Failure: Reduced bond strength and film defects
Mitigation: Maintain clean processing environment and implement quality control checks for raw materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% thickness variation, bond strength >200 N/25mm minimum

Test Method

ASTM F88 for seal strength, ISO 11357 for thermal analysis, FDA 21 CFR for food contact compliance

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 Tie Layer

Manufacturer profiles associated with Tie Layer.

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Related Components

Sealant Layer

Sealant layer in multi-layer co-extruded barrier films for hermetic sealing and product protection.

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.

Frequently Asked Questions

What is the primary function of a tie layer in multi-layer films?

The tie layer provides adhesion between incompatible polymer layers that would otherwise separate, enabling the creation of multi-functional barrier films with combined properties.

How do you select the appropriate tie layer material?

Selection depends on the chemical compatibility with adjacent layers, required bond strength, processing conditions, and end-use requirements such as food contact compliance or environmental resistance.

Can tie layers affect the recyclability of multi-layer films?

Yes, some tie layers can complicate recycling by creating incompatible polymer mixtures. Recent developments focus on compatibilizing tie layers that improve recyclability while maintaining performance.

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.

Tie Layer