Polyurethane Heated Hose for Stable Connections Between PU Processing Modules

Polyurethane processing equipment often consists of several separate functional sections.

A typical machine may include:

Material Tank → Pump → Metering Unit → Heated Hose → Mixing or Application Head

Each section may control the polyurethane material correctly on its own.

However, the flexible connection between those sections can become the weakest thermal point in the complete system.

If PU material leaves a heated tank at the correct condition but loses temperature while passing through the hose, the downstream metering or mixing unit may receive material with different flow characteristics.

The polyurethane heated hose shown is designed for polyurethane equipment, including single-component and two-component PU systems, where maintaining a stable material condition between machine modules is important.

The standard product is specified for temperatures up to approximately 180°C.

Flexible Connections Are Important in Modular PU Equipment

Many polyurethane machines are modular rather than built as one fixed block.

The material unit, metering system and application head may be installed at different positions.

A flexible hose allows these modules to be connected without requiring complicated rigid piping.

This can provide practical advantages when:

• The machine layout changes

• A metering unit is upgraded

• A new application head is installed

• The equipment is serviced

• Production modules are repositioned

For OEM machine manufacturers, a customized heated hose can make the entire PU system easier to design and maintain.

Connector Areas Can Become Thermal Weak Points

When engineers think about heating performance, they often focus on the middle of the hose.

But the areas near the fittings are equally important.

The transition between:

• Heated tank and hose

• Hose and metering block

• Hose and mixing head

can create local heat loss.

If polyurethane begins to cool near these interfaces, the material may become more viscous before reaching the next component.

A properly designed heated hose should therefore consider the complete assembly rather than only the central hose body.

Single-Component PU Systems Need Stable Transfer Conditions

A single-component polyurethane system may appear simpler than a two-component machine.

However, the material can still be sensitive to temperature changes.

If the material becomes colder during transfer, the equipment may experience:

• Higher flow resistance

• Slower pump response

• Greater pressure variation

• More difficult startup

Maintaining a controlled hose temperature helps keep the PU material closer to its intended processing condition.

Two-Component PU Equipment Has Additional Requirements

Two-component systems typically keep Component A and Component B separate until the mixing stage.

This means both material lines may need controlled thermal conditions.

If one component is transferred through a significantly colder hose than the other, their viscosities may differ before mixing.

This can affect the behavior of the metering system.

For this reason, two-component hose assemblies should be selected according to:

• Material A properties

• Material B properties

• Temperature requirements

• Required flow

• Pump configuration

The two hoses do not necessarily need identical settings if the two materials have different process requirements.

Standby Conditions Can Be More Demanding Than Continuous Production

During normal production, material continues to move through the hose.

During standby, polyurethane remains stationary.

The hose continues to lose heat to the surrounding environment, while the material inside is no longer constantly replaced by freshly conditioned material.

This can make standby conditions particularly important.

A temperature-controlled hose can help reduce excessive cooling during:

• Production pauses

• Machine adjustment

• Short maintenance stops

• Shift changes

This supports more predictable restart conditions.

Why Hose Length Matters

A long hose gives the machine designer more installation freedom.

However, longer hoses also create:

• Greater heat-loss surface

• More internal material volume

• More pressure drop

• Longer material residence time

For polyurethane equipment, hose length should therefore be selected carefully.

The best hose is not automatically the longest hose.

The correct design should provide enough flexibility for machine installation while avoiding unnecessary length.

Up to Approximately 180°C

The catalog specifies a maximum heat-resistant temperature of approximately:

180°C

The actual working temperature should be selected according to the polyurethane material.

Important factors include:

• PU formulation

• Material viscosity

• Processing temperature

• Hose length

• Ambient environment

• Flow rate

The objective is stable processing, not maximum heating.

Pressure Capability Varies by Diameter

The catalog provides several sizes from approximately 1/4 inch to 1 inch.

Working pressure decreases as hose diameter increases.

This means the correct hose size should be selected according to:

• Required flow

• Working pressure

• Material viscosity

• Hose length

• Minimum bending radius

Choosing the largest available diameter is not always the best solution.

Suitable Applications

Potential applications include:

• Single-component polyurethane machines

• Two-component PU equipment

• PU laminating systems

• Polyurethane adhesive machinery

• PU metering units

• Mixing equipment

• Dispensing systems

• Composite-material processing

• Industrial bonding equipment

• Customized OEM machinery

Customization Options

Jingcheng can customize:

• Hose length

• Inner diameter

• Working temperature

• Voltage

• Heating power

• Temperature sensor

• End fittings

• Electrical connector

• Cable length

• Connection orientation

This allows the hose to match the actual PU equipment instead of forcing the machine to use a generic hose.

What Information Should Be Provided?

Please provide:

• Polyurethane type

• Single- or two-component system

• Component A / B information

• Working temperature

• Working pressure

• Maximum pressure

• Material viscosity

• Required flow

• Hose length

• Inner diameter

• Voltage

• Heating power

• Temperature sensor

• End fittings

• Equipment model

Conclusion

A polyurethane heated hose is most useful when it creates a stable thermal connection between separate machine modules.

In single- and two-component PU systems, the hose can influence material viscosity, pressure response and restart behavior before the material reaches the metering or mixing section.

For OEM manufacturers and replacement projects, the correct hose should therefore be selected according to the material, machine layout, temperature, pressure, hose length and electrical interface as one complete system.