Low Pressure PU Foam Machine

Yongjia polyurethane low pressure machine has a compact structure and is easy to maintain.

We provide a 5-year warranty and full-process technical support to ensure your production is always efficient and stable.

Overview

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Low pressure PU foam machine

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✓Manufacturer Since 2006✓Exported to 60+ Countries✓Up to 5-Year Warranty✓OEM / ODM & CE✓Turnkey + Training Support

Low Pressure PU Foaming Machine — Overview

A low pressure PU foaming machine meters and mixes two or three liquid polyurethane components (polyol, isocyanate and optional additives) through a mechanical mixing head and dispenses the reacting blend into a mold or cavity. Unlike high-pressure systems, a low pressure polyurethane foaming machine mixes at roughly 2–20 bar using a rotary stirrer, which makes it cost-effective, easy to maintain and well suited to flexible and semi-rigid molded foam.

Because the mixing head recirculates between shots, a low pressure foam dispensing machine handles frequent color and formula changes, making it a flexible choice for varied molded parts. Yongjia builds low pressure PU foaming machines with customizable output, two- or three-component metering, programmable shot weight and tailored mixing heads to match your part size and cycle time.

Typical applications include PU gaskets and filter end-caps, memory foam pillows, automotive and bike seats, insoles, decorative cornices, faux stone and anti-fatigue mats. For higher output rigid foam and panel lines, see our high pressure PU machine; for gasket sealing specifically, see the PU gasket dispensing machine.

Buyers also describe this equipment as a low pressure PU foam injection machine, foam dosing machine or foam dispensing machine — the terms all refer to the same low pressure metering-and-mixing principle. Whether your process pours into an open mould, injects into a closed cavity or doses foam onto a substrate, the machine is configured with the matching mixing head, shot-weight programme and swing arm or fixture.

Machine Structure

Low pressure PU foam machine structure — A-side and B-side heated material tanks, metering pumps, cantilever mixing head and HMI control, with mixing-head, metering-pump and tank cross-sections and the material flow path.

How It Works

A low pressure PU foaming machine meters each component, blends them mechanically in a recirculating stirred mixing head at low pressure (2–20 bar), and pours the mix into your mould or cavity.

Metering — Metering pumps dose polyol, isocyanate and any pigment or filler to the set ratio and shot weight.

Mechanical mixing — A high-speed stirrer blends the components inside the mixing head at low pressure (2–20 bar) — no impingement needed.

Pouring — The swing arm positions the head and pours the reacting mix into the mould, cavity or fixture.

Reaction & rise — The blend reacts and expands into flexible, semi-rigid, rigid or integral-skin foam, then cures to the target density.

Recirculate & flush — Between shots the head recirculates and is solvent-flushed via the cleaning tank, so color and formula changes are quick.

Technical Parameters

Foam Application	Rigid / flexible / integral-skin foam
Mixing Method	Low-pressure mechanical stirring (~2–20 bar)
Model Series	SPU-LS (2-component) / SPU-LR (3-component)
Shot Weight / Output	15–2500 g per shot (model-dependent)
Components	2 to 11 component
Pigment / Filler	Supported
Control System	DELTA / SIEMENS PLC + DELTA HMI touch screen
Customization	OEM/ODM, CE — mixing head, output & automation configurable

Core Components

Mechanical Mixing HeadHigh-speed stirrer blends the components at low pressure; mounted on a swing arm for flexible, repeatable pouring.

Metering PumpsPrecise pumps dose each component to the set ratio and shot weight, driven by dedicated motors.

Heated Material TanksPOLY and ISO day tanks with heaters and a level display keep raw material at stable temperature and viscosity.

FilterIn-line filter protects the metering pumps and mixing head from particles in the raw material.

Cleaning TankSolvent-flush system clears the mixing head between shots, enabling fast color and formula changes.

Control CabinetDELTA / SIEMENS PLC with touch-screen HMI sets shot weight, ratio, timing and pouring sequence.

Low Pressure Machine Types

Choose by how many separate metered streams your formula needs — from a simple two-component build to a multi-component system with up to eleven streams.

Two-Component (2K)SPU-LS seriesMeters polyol and isocyanate in two independent streams — the workhorse build for standard flexible, semi-rigid and rigid molded foam such as pillows, seats, insoles, cornice and faux stone. Simple, reliable and easy to operate, with shot weight from 15 to 2500 g and optional pigment or filler dosing.

Multi-Component (3–11 Component)SPU-LR seriesAdds separate metered streams for color / pigment, filler, catalyst, blowing agent and other additives — from three up to eleven components. Ideal for precise color matching, filled or reinforced foam and complex recipes, letting you adjust the formula on the fly without pre-mixing. Each stream is independently metered and controlled.

Low Pressure vs High Pressure

Low pressure suits flexible and molded foam, integral-skin parts and frequent formula or color changes at small-to-medium output; high pressure suits high-output rigid foam and continuous panel lines. The right choice depends on your part, output, mould count and how often the formula changes.

	Low Pressure	High Pressure
Mixing method	Mechanical / dynamic stirring	High-pressure impingement (self-cleaning head)
Solvent flush	Yes — cleaning tank	Not required
Output	Shot 15–2500 g, small to medium	High, 90–450 kg/min
Best for	Flexible / molded / integral-skin foam, frequent changes	High output, stable formula, rigid & panels
Components	2 to 11 component	Two to three component
Investment	Lower	Higher

See our high pressure PU machine or the guide High vs Low Pressure: which is better?

How to Choose the Right Configuration

Tell us your product and target shot weight and our engineers size the machine. As a quick guide:

Your product / requirement	Recommended configuration
Memory-foam pillow	Two-component low-pressure machine + pillow mould / carousel
Car or bike seat, cushion	Molded-foam build with matching mixing head and mould line
Shoe sole / insole	Low-pressure machine sized to shot weight + sole mould line
Gaskets & filter end-caps	FIPFG / dispensing configuration — see the gasket dispensing machine
Frequent color or formula changes	Recirculating head + cleaning tank; 3-to-5-component for additives
Integral-skin parts (armrest, steering)	Skin-foam build with temperature control
High-output rigid foam / panels	Compare our high pressure PU machine

Configuration & Options

Every machine is built to your product, shot weight and mould. A typical build:

Standard Configuration

Two-component low-pressure metering
Mechanical mixing head on a swing arm
Heated, agitated POLY / ISO day tanks
Precise metering pumps with dedicated motors
DELTA PLC + touch-screen HMI
Solvent-flush cleaning tank

Optional / Custom

Three- to five-component metering
Pigment / color and filler dosing
SIEMENS PLC upgrade
Carousel, conveyor or rail mould line
Drying / curing oven line integration
Custom output, voltage and tank volume
Moulds & fixtures, installation, operator & formula training, OEM/ODM, CE and a five-year warranty

Applications & Advantages

Yongjia’s low pressure PU foaming machines are used across furniture and bedding, automotive seating, footwear, sealing and decorative products. The recirculating mixing head and solvent-flush cleaning tank make color and formula changes fast, while 2-to-5-component metering supports pigment, filler and additive systems — a flexible, cost-effective choice from a China manufacturer since 2006, exported to 60+ countries with OEM/CE support.

The same mechanical mixing platform also meters and pours two-component EV battery pack potting compound — a low-viscosity PU (or PU/epoxy) encapsulant dispensed around cells and busbars for thermal management, dielectric insulation and vibration damping. Precise ratio control and programmable shot weight keep the pour consistent across pack sizes and formats.

Furniture & Bedding

Memory Foam Pillow Mattress Sofa / Cushion Anti-Fatigue Mat

Automotive & Seating

Car Seat Motorcycle / Bike Seat Headrest Integral Skin EV Battery Pack Potting

Footwear & Sports

Shoe Sole Insole Shoulder Pad Knee Pad Stress Ball

Sealing & Filtration

PU Gasket (FIPFG)Filter End-Cap Air Filter Cooling Gel Pad

Decorative & Molded

Faux Stone Decorative Cornice Mirror Frame Toy Ball

Request a Quote for Your Application →

Frequently Asked Questions

Is a low pressure foam machine the same as a PU foam injection or dosing machine?

Yes — low pressure PU foaming machine, foam injection machine, foam dosing machine and foam dispensing machine are different names for the same equipment class: components are metered, mechanically mixed at low pressure and delivered into a mould, cavity or onto a part. The configuration (mixing head, fixture, shot programme) is matched to whether you pour, inject or dose.

What is a low pressure PU foaming machine?

It is a polyurethane dosing system that meters polyol and isocyanate (plus optional color or additives), mixes them mechanically in a recirculating mixing head at low pressure (about 2–20 bar), and pours the mixture into a mold to form flexible or semi-rigid PU foam.

What is the difference between low pressure and high pressure PU foaming machines?

A low pressure machine mixes mechanically and requires solvent flushing, but costs less and is ideal for flexible molded foam, frequent formula changes and small-to-medium output. A high pressure PU machine uses impingement mixing (100–200 bar), needs no solvent flush, and suits high-volume rigid foam such as insulation panels and refrigerators.

What can a low pressure PU foaming machine produce?

Common products include memory foam pillows, car and bike seats, PU soles and insoles, gaskets, filter end-caps, decorative cornice, faux stone and anti-fatigue mats.

How many components and what output can the machine handle?

We offer two- and three-component low pressure PU foaming machines. Output (g/s), tank capacity, number of mixing heads and shot weight are all configured to your application—tell us your part weight and target cycle time and we will size the system.

Can the machine be customized, and what is the MOQ and lead time?

Yes. Mixing head, output, automation level and pouring layout are customizable. As a China manufacturer we support OEM/ODM and CE certification. Contact us with your part specification for an exact configuration, price and lead time.

Get a Price Quote

Tell us your output, mold and automation requirements — our engineers reply within 24 hours with an exact price, configuration and lead time. OEM/ODM & CE supported.

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