Maintaining Metering Stability in Polyurethane Processing Equipment

Introduction

Polyurethane processing requires more than simply moving material from one machine section to another.

The viscosity of polyurethane resin, adhesive or reactive components may change significantly when the material temperature varies. This directly affects pumping, metering, mixing and dispensing performance.

A heated PU transfer hose maintains material temperature between the supply system, metering pump, mixing unit and application equipment.

The product is suitable for single-component polyurethane machines, two-component PU systems, laminating equipment and other connecting devices.

The Relationship Between Temperature and PU Metering

Polyurethane equipment often depends on accurately controlled material quantities.

If temperature decreases inside the hose, the material may become more difficult to pump. As a result, the system can experience:

• Increased pressure

• Reduced flow rate

• Metering deviation

• Unstable mixing ratio

• Delayed dispensing

• Material accumulation

• Hose blockage

• Longer startup time

• Production inconsistency

Maintaining a more stable temperature supports repeatable process conditions.

Single- and Two-Component Equipment

The hose can be configured for:

Single-Component PU Systems

These systems require continuous and stable transfer of one temperature-sensitive material.

Important selection parameters include:

• Material viscosity

• Processing temperature

• Pump pressure

• Required flow

• Hose length

• Fitting structure

Two-Component PU Systems

Two-component equipment may use separate hoses for component A and component B.

Each line may require different:

• Inner-tube material

• Heating power

• Temperature setting

• Diameter

• Pressure rating

• Cleaning procedure

The two hose assemblies should be selected according to the actual properties of each component.

Uniform Heating Reduces Process Variation

The heating elements are distributed around the hose to reduce temperature differences along the transfer route.

This supports:

• More stable PU viscosity

• Predictable pump response

• Improved metering consistency

• Reduced cold areas

• Lower blockage risk

• More repeatable mixing

• Smoother continuous production

High-efficiency insulation helps reduce thermal loss and limits unnecessary energy consumption.

Equipment Connection and Installation

Polyurethane-processing machines may use non-standard fittings, electrical plugs or sensors.

A complete replacement hose may require confirmation of:

• Machine-side fitting

• Mixing-head fitting

• Sensor resistance

• Voltage

• Heating power

• Electrical connector

• Pin arrangement

• Cable length

• Hose orientation

Matching only the hose diameter is not sufficient.

Standard Temperature Range

This PU equipment hose supports operating temperatures up to:

180°C

The actual setting should be determined according to the polyurethane formulation and equipment process.

Higher-temperature requirements require a separate material and structural evaluation.

Typical Applications

• Single-component polyurethane equipment

• Two-component PU systems

• PU adhesive transfer

• Polyurethane laminating machines

• Composite-material equipment

• Resin metering systems

• Mixing and dispensing units

• Polyurethane coating equipment

• Industrial bonding machinery

• Reactive material-transfer systems

• PU injection equipment

• Replacement hoses for polyurethane machines

Available Configuration

Reference Product Data

*The 5/16-inch burst-pressure values in the source image require verification.

These are catalog reference values. Final operating pressure depends on temperature, PU material, fittings and complete hose construction.

Technical Information Required

Please provide:

• Polyurethane material name

• Component A or component B

• Single- or two-component system

• Required working temperature

• Normal pressure

• Maximum pressure

• Material viscosity

• Required flow rate

• Hose length

• Inner diameter

• Voltage

• Heating power

• Sensor type

• Inlet and outlet fittings

• Electrical connector

• Equipment model

• Original hose sample or drawing