Pneumatic Tube (PU / Nylon) | Roll Forming Machine Air Tubing

Pneumatic Tube (PU / Nylon)

1. Technical Definition

A pneumatic tube, commonly made from polyurethane (PU) or nylon, is a flexible air line used to transport compressed air between components in pneumatic systems.

These tubes connect air supply sources, valves, cylinders, sensors, and control components, allowing compressed air to move through the machine to operate pneumatic actuators.

In roll forming machines, pneumatic tubes are commonly used in systems supporting:

Pneumatic punching units
Automation control valves
Material clamping cylinders
Air-powered actuators
Compressed air distribution systems

They are essential components in industrial pneumatic circuits.

2. Where It Is Located

Pneumatic tubes run throughout the pneumatic system, connecting various air-operated components.

Common installation locations in roll forming machines include:

Air supply distribution lines
Connections between solenoid valves and cylinders
FRL (Filter Regulator Lubricator) output lines
Pneumatic control manifolds
Automation actuator systems

The tubes are typically routed along machine frames using tube clamps or cable guides.

3. Primary Functions

3.1 Transport Compressed Air

Transfers air between pneumatic components.

3.2 Connect Pneumatic Devices

Links valves, actuators, and regulators in the system.

3.3 Support Automation Control

Allows air signals to operate pneumatic actuators.

3.4 Maintain Flexible Routing

Provides flexible air distribution within machine assemblies.

4. How It Works

Pneumatic tubing transports compressed air through sealed connections.

Typical operation process:

Compressed air enters the pneumatic system from the air supply.

The air passes through regulators and filters.

Pneumatic tubes carry the air to control valves.

Valves direct air through tubes to pneumatic cylinders or actuators.

The compressed air activates the cylinder or device.

Exhaust air is released through pneumatic exhaust ports.

This system allows controlled air-powered machine functions.

5. Types of Pneumatic Tubing

Polyurethane (PU) Tube

Flexible tubing commonly used in automation systems.

Nylon Tube

Stronger tubing with higher pressure resistance.

Reinforced Pneumatic Tube

Includes additional reinforcement for high-pressure applications.

Anti-Kink Pneumatic Tube

Designed to resist bending and deformation.

6. Construction & Materials

Pneumatic tubes are manufactured from flexible polymers designed for compressed air transport.

Common materials include:

Polyurethane (PU)
Nylon (PA)
Polyethylene (PE)
Reinforced polymer composites

Important structural characteristics include:

Flexible tubing walls
Pressure-resistant construction
Smooth internal surfaces
Abrasion resistance

These features ensure reliable air flow.

7. Design Considerations

Engineers consider several factors when selecting pneumatic tubing.

Important considerations include:

Operating pressure rating
Tube diameter
Temperature resistance
Flexibility requirements
Chemical resistance

Proper tubing selection ensures reliable pneumatic system operation.

8. Load & Stress Conditions

Pneumatic tubes must withstand:

Compressed air pressure
Repeated bending and movement
Machine vibration
Industrial environmental exposure

Industrial tubing is designed for long service life.

9. High-Speed Production Considerations

High-speed roll forming machines often use pneumatic systems with rapid cycling. Pneumatic tubes must maintain consistent airflow and resist vibration damage.

10. Heavy Gauge Applications

Heavy gauge roll forming machines may use larger pneumatic tubes to support high-flow air systems.

11. Light Gauge Applications

Light gauge roll forming machines typically use smaller diameter pneumatic tubing for compact pneumatic circuits.

12. Common Failure Causes

Pneumatic tubes may fail due to:

Tube abrasion or wear
Kinking or bending damage
Excessive pressure
Improper installation

Routine inspection helps prevent tubing failures.

13. Symptoms of Pneumatic Tube Issues

Technicians may observe:

Air leaks in pneumatic lines
Reduced actuator performance
Hissing sounds from air leaks
Cracked or damaged tubing

These symptoms may indicate tubing failure.

14. Installation Requirements

Proper installation of pneumatic tubing includes:

Cutting tubing to the correct length
Ensuring clean tube ends
Installing tubes into push-fit fittings
Securing tubes with clamps or guides

Correct installation ensures leak-free connections.

15. Maintenance Requirements

Routine maintenance should include:

Inspecting tubing for wear or cracks
Checking pneumatic fittings for leaks
Replacing damaged tubing
Verifying secure tube routing

Regular maintenance ensures reliable air distribution.

16. Typical Replacement Cost

Pneumatic tube costs vary depending on material and size.

Typical price ranges include:

Small pneumatic tubing (per meter)
$1 – $3

Industrial pneumatic tubing (per meter)
$3 – $10

Heavy-duty pneumatic tubing (per meter)
$10 – $25+

Costs depend on tube diameter and material type.

17. Safety Considerations

Damaged pneumatic tubing may lead to:

Compressed air leakage
Reduced pneumatic system performance
Unexpected actuator behavior
Energy inefficiency

Proper tubing maintenance is important for safe machine operation.

18. Role in Roll Forming Machine Assemblies

Pneumatic tubes support pneumatic systems used in roll forming machines including:

Pneumatic punching systems
Air-operated clamping mechanisms
Material positioning systems
Automation control circuits
Compressed air distribution networks

They transport compressed air between pneumatic components.

Engineering Summary

The pneumatic tube (PU / nylon) is a flexible air line used to transport compressed air within pneumatic systems.

It:

Transfers compressed air between components
Connects valves, cylinders, and regulators
Supports pneumatic automation systems
Provides flexible air routing
Ensures reliable air distribution

Pneumatic tubes are essential components used in roll forming machine pneumatic control systems.

Technical FAQ

What is pneumatic tubing?
It is flexible tubing used to transport compressed air in pneumatic systems.

What materials are pneumatic tubes made from?
Common materials include polyurethane and nylon.

Where are pneumatic tubes used?
They connect valves, regulators, and pneumatic cylinders.

Why are PU tubes commonly used?
They provide flexibility and good abrasion resistance.

What happens if a pneumatic tube leaks?
Compressed air may escape and reduce system performance.