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Low-Pressure Metering Systems for Efficient Polyurethane Processing
Low-pressure metering refers to systems designed to meter and mix two-component polyurethane materials at moderate pressures, making them ideal for small to medium production runs, low-pressure foams, elastomers, coatings, and C.A.S.E. polyurethanes (coatings, adhesives, sealants, and elastomers). These machines deliver accurate metering and mixing at lower operating pressures, while handling a broad range of component viscosities and production requirements.
Low-pressure metering is often chosen when gentler dispensing is needed — such as when materials are shear-sensitive, require multiple independent stream processing, or when pump wear must be minimized over extended service life.
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Why Low-Pressure Metering Matters
Low-pressure metering systems are valued because they:
- Handle variable viscosities, including high-viscosity polyurethanes, with ease.
- Deliver repeatable material ratios even as output rates vary.
- Reduce wear on pumps and valves compared with high-pressure systems in certain applications.
- Are well-suited for both batch and continuous processes.
- Support foam, elastomer, and specialty coating applications where gentle metering yields better quality.
Common Industrial Applications
Low-pressure metering systems are used in a variety of polyurethane processing scenarios, including:
- Low-pressure polyurethane foam production, such as flexible or integral skin foams.
- Elastomeric coatings and sealants are dispensed in automotive and appliance markets.
- Laboratory and prototyping environments where flexible ratio control is needed.
- Furniture and building materials, where smooth, low-pressure delivery improves product quality.
Related Industries
How Low-Pressure Metering Works
Low-pressure metering machines typically operate with the following stages:
- Material Feed: Components A and B are supplied from tanks with agitators or conditioning to maintain consistent viscosity.
- Metering: Pumps meter each component independently at precise ratios with controlled flow, but at lower system pressures compared with high-pressure metering.
- Mixing: Metered streams are combined through static or dynamic mixing heads for uniform blended material.
- Dispensing: Mixed material is dispensed into molds, onto surfaces, or into continuous processes with shot or bead control.