How to Prevent TPU Multi-Lumen Medical Tubing from Becoming Sticky | Medical Extrusion Solutions

How to Solve Stickiness in TPU Multi-Lumen Medical Tubing

Thermoplastic Polyurethane (TPU) has become one of the most widely used materials in the medical device industry due to its excellent flexibility, biocompatibility, abrasion resistance, and durability. TPU multi-lumen medical tubing is commonly used in interventional catheters, infusion systems, drainage devices, and minimally invasive surgical instruments.

However, manufacturers often encounter a common challenge during production and storage:

TPU multi-lumen tubing becomes sticky or tacky on the surface.

Surface stickiness can negatively affect:

• Product appearance

• Automated assembly processes

• Packaging efficiency

• Catheter insertion performance

• Product shelf life

• Customer acceptance

In this article, we will explore the root causes of TPU tubing stickiness and provide proven solutions to improve product quality and manufacturing consistency.

What Is TPU Multi-Lumen Medical Tubing?

TPU Multi-Lumen Tubing refers to medical tubing with two or more internal channels designed to perform multiple functions simultaneously, such as:

• Fluid delivery

• Drug infusion

• Guidewire passage

• Pressure monitoring

• Sensor integration

• Balloon inflation

Advantages of TPU Medical Tubing

TPU offers several advantages for medical applications:

• Excellent flexibility

• Superior kink resistance

• High tear strength

• Good biocompatibility

• Sterilization compatibility

• Long-term durability

These properties make TPU an ideal material for:

• Cardiovascular catheters

• Neurovascular catheters

• Urinary catheters

• Infusion tubing

• Diagnostic devices

• Minimally invasive surgical instruments

Why Does TPU Medical Tubing Become Sticky?

Understanding the causes of surface tackiness is the first step toward solving the problem.

1. High Surface Energy of TPU Materials

TPU is an elastomeric material with naturally high surface energy.

Particularly in lower-durometer TPU grades, molecular chains remain relatively mobile, causing:

• Increased surface adhesion

• Higher friction coefficients

• Sticky or tacky surface feel

This phenomenon becomes more noticeable in warm and humid environments.

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2. Excessive Moisture Content in TPU Resin

TPU is highly hygroscopic and absorbs moisture from the surrounding environment.

If drying is insufficient before extrusion:

• Hydrolysis may occur

• Molecular weight decreases

• Surface quality deteriorates

• Sticky residue may develop

Recommended Drying Parameters

Proper resin drying is essential for producing high-quality medical tubing.

3. Excessive Extrusion Temperature

Improper processing temperatures can lead to TPU degradation.

When melt temperatures exceed recommended levels:

• Polymer chains break down

• Low-molecular-weight compounds migrate to the surface

• Tubing becomes softer and stickier

Recommended Processing Range

• Barrel Temperature: 170–210°C

• Die Temperature: 180–220°C

• Stable melt temperature monitoring

Careful temperature control helps maintain optimal tubing performance.

4. Additive Migration

Some TPU formulations contain additives such as:

• Plasticizers

• Lubricants

• Anti-static agents

• Processing aids

If incompatible additives are used, migration to the tubing surface may occur, resulting in:

• Oily appearance

• Surface tackiness

• Dust attraction

• Product contamination

Medical-grade TPU formulations with low extractables are recommended.

5. Improper Storage and Packaging Conditions

Many manufacturers observe that tubing appears normal immediately after production but becomes sticky after weeks or months in storage.

Common causes include:

• High ambient temperatures

• High humidity levels

• Excessive compression during packaging

• Poor ventilation

These issues are especially common in tropical climates and high-humidity regions.

Effective Solutions for TPU Multi-Lumen Tubing Stickiness

1. Select Medical-Grade Low-Tack TPU Materials

The most effective solution begins with material selection.

Choose TPU grades specifically designed for:

• Medical tubing extrusion

• Catheter manufacturing

• Low surface tack

• Long-term stability

Benefits include:

• Lower friction coefficient

• Improved handling

• Reduced tubing adhesion

• Better packaging performance

2. Optimize Medical Tubing Extrusion Parameters

Precision extrusion plays a critical role in surface quality.

Key Process Controls

Screw Speed Optimization

Avoid excessive shear stress that can degrade TPU.

Stable Vacuum Sizing

Maintain dimensional consistency and smooth surface finish.

Controlled Cooling Systems

Use multi-stage cooling to reduce residual stress and improve surface characteristics.

Melt Pressure Monitoring

Ensure consistent material flow throughout production.

3. Apply Surface Treatment Technologies

Surface modification can significantly reduce stickiness.

Plasma Treatment

Benefits include:

• Improved surface stability

• Enhanced coating adhesion

• Reduced tackiness

UV Surface Treatment

Can help stabilize surface properties and improve long-term performance.

Hydrophilic Coating Technology

Widely used in:

• Interventional catheters

• Neurovascular devices

• Urinary catheters

Advantages include:

• Ultra-low friction

• Reduced insertion force

• Anti-sticking properties

4. Improve Packaging and Storage Management

Proper post-processing is equally important.

Recommended Practices

Individual Coil Packaging

Prevents tubing-to-tubing contact.

Protective Separator Films

Use:

• PET separator films

• Medical-grade liners

• Sterile barrier materials

Controlled Warehouse Conditions

Recommended storage environment:

Custom Medical Tubing Extrusion Capabilities from Kunshan Bova Plastic Co., Ltd.

As a specialized manufacturer of precision medical tubing, Kunshan Bova Plastic Co., Ltd. provides customized extrusion solutions for global medical device manufacturers.

Our Medical Tubing Capabilities

Multi-Lumen Medical Tubing

• Dual-lumen tubing

• Triple-lumen tubing

• Four-lumen tubing

• Customized multi-lumen profiles

• Complex lumen geometries

Advanced Medical Extrusion

• Single-layer tubing

• Multi-layer co-extrusion tubing

• Two-layer tubing

• Three-layer tubing

• Five-layer tubing

Material Processing Expertise

We support a wide range of medical-grade materials, including:

• TPU

• Pebax®

• PEEK

• PE

• PP

• PA (Nylon)

• FEP

• PTFE

• Custom polymer blends

Precision Manufacturing

• Micro-extrusion technology

• Thin-wall tubing

• Tight tolerance control

• Small-diameter catheter tubing

• Custom dimensional specifications

Specialty Medical Tubing Solutions

• Radiopaque tubing

• Reinforced braided tubing

• Balloon catheter tubing

• Retrieval catheter tubing

• Hydrophilic coating substrates

• High-pressure tubing systems

Medical Device Applications

Our tubing solutions are widely used in:

• Cardiovascular intervention

• Neurovascular intervention

• Electrophysiology devices

• Urology products

• Infusion systems

• Endoscopic instruments

• Minimally invasive surgical devices

From concept development and material selection to prototyping and mass production, we help medical device manufacturers accelerate innovation while maintaining the highest quality standards.

Conclusion

TPU multi-lumen medical tubing stickiness is a common but manageable challenge in catheter and medical tubing manufacturing.

By focusing on:

• Low-tack medical-grade TPU materials

• Proper resin drying

• Optimized extrusion parameters

• Surface treatment technologies

• Controlled packaging and storage conditions

manufacturers can significantly improve tubing quality, reduce production issues, and enhance product performance.

For advanced medical tubing applications, partnering with an experienced precision extrusion manufacturer is essential to achieving consistent, reliable, and regulatory-compliant results.