High-Flow PU Foam Machine for Box Foam Blocks 1
Low Pressure Polyurethane Machine
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Low-Pressure Box Foaming Machine | Foam Blocks

Low-pressure polyurethane metering and dynamic mechanical mixing for batch Box Foaming. The reactive mixture is poured into a box mold for free rise, then the foam block is cured and conditioned before slicing. Configure the machine to the formulation, block dimensions and required production capacity.

Output Flow Range

1～15 kg/min (customizable)

Metering Accuracy

±0.3%

Mixing Ratio Range

A:B = 1:3 ~ 3:1

Mixing Head Speed

2000～6000 rpm (VFD adjustable)

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Availability on Request Delivery Schedule on Quotation 1-Year Warranty
High-Flow PU Foaming Machine for Large Box Foam Blocks

Product Overview

The HF‑LPM‑1A1B‑LO is a high‑flow PU foaming machine with dual vacuum degassing and servo metering, ensuring near‑zero bubble and consistent foam quality for large box blocks.

The HF-LPM-1A1B-LO is a high-flow PU foaming machine for producing large box foam blocks. It features a dual vacuum auxiliary degassing system (tank vacuum + pouring head terminal vacuum) that reduces bubble rate by over 70%, combined with a high-shear dynamic mixing head (2,000–6,000 rpm) for fine, uniform cell structure. The servo closed-loop metering system monitors and compensates flow errors in real time, eliminating ratio drift and ensuring absolute A/B proportion stability. With adjustable output flow of 1–15 kg/min (customizable) and a mixing ratio of 1:3–3:1, it handles high-resilience foam, memory foam, rigid insulation, and custom industrial/military PU blanks. PLC control stores multiple recipes with one-click switching, plus automatic cleaning and fault self-diagnosis. The synchronous beat linkage design coordinates with automated conveying lines, entering buffer mode when upstream stations pause. A single pour produces several cubic meters of foam, dramatically improving mass production efficiency.

Product Overview

Configured

To Your Production Brief

Production Workflow

Raw Material Degassing

Load polyol and isocyanate into tanks (250‑1000L for A, 200‑800L for B); activate tank vacuum degassing to remove dissolved air and moisture.

Recipe Selection & Ratio Setting

Choose stored formula on touch screen; set A:B ratio (1:3 ~ 3:1) and target output flow (1‑15 kg/min) per foam type.

High‑Shear Mixing & Pouring

Servo pumps deliver precise amounts to dynamic mixing head (2000‑6000 rpm); terminal vacuum further degasses; pour into large box mold with synchronized conveyor motion.

Curing, Demolding & Cleaning

After foam rises and cures, demold the block; automatic cleaning cycle flushes mixing head to prepare for next pour.

Precision parameters for consistent large‑block foaming

Technical Specifications

Specifications are based on standard configurations at ambient conditions. Customizable output, tank sizes, and component counts (2‑6) are available upon request.

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Technical ParameterHF-LPM-1A1B-LO
Output Flow1kg/min / 5kg/min / 10kg/min / 15kg/min, non-standard customization supported
Mixing Ratio RangeA:B = 1:3 ~ 3:1, adjustable freely
Raw Material Tank CapacityTank A: 250L / 500L / 1000L; Tank B: 200L / 450L / 800L, customized volume available
Installed PowerConfigured according to discharge flow & temperature control demands
Mixing Head Speed2000~6000rpm, frequency conversion adjustable
Metering Accuracy±0.3%
Total Machine Weight2200kg (excluding supporting auxiliary equipment)
Warranty1-year full machine warranty
CertificationsConfirm applicable documents for the quoted configuration
BrandHaifeng
Why Choose Our High‑Flow Box Foam Machine

Key Advantages

Five engineering innovations that eliminate bubble defects, ratio drift, and production downtime, ensuring stable output and high equipment OEE (＞85%).

Dual Vacuum Auxiliary Degassing

Tank vacuum degassing plus pouring head terminal vacuum reduce bubble rate by over 70%, producing fine, uniform foam cells with no shrinkage or cracking.

Servo Closed‑Loop Metering

Real‑time flow error monitoring and compensation completely eliminate ratio drift, ensuring consistent foam softness and cutting raw material waste.

Stable Long‑Term Continuous Production

Automated high‑precision metering minimizes manual adjustments and downtime; supports 24/7 operation with consistent quality and reliable delivery cycles.

Intelligent PLC Control with OEE ＞85%

Touch screen stores multiple formulas with one‑click switching; full batch data traceability (ratio, pressure, temperature); built‑in auto‑cleaning and fault self‑check alarm.

Synchronous Beat Linkage Design

Encoder and sensor full linkage enables “mold chasing the mixing head”; upstream stall triggers automatic buffer mode to avoid wasted material and downtime.

Comprehensive After‑Sales Support

1‑year warranty, overseas engineer on‑site installation/commissioning/training, lifetime remote technical guidance, and timely global spare parts supply.

COMPLETE SOLUTION

Complete Your Production Line

Integrate the product with our full range of auxiliary equipment for a turnkey polyurethane processing system.

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Frequently Asked Questions

What is Box Foaming?
Box Foaming is a batch process in which a polyurethane mixture is poured into a box mold and allowed to rise freely. After curing and conditioning, the foam block is demolded and cut or sliced for the intended application.
Does this machine use low-pressure or high-pressure mixing?
This machine belongs to the low-pressure polyurethane machine range. Components are metered and mixed mechanically in a dynamic mixing head before box pouring; this configuration does not use high-pressure impingement mixing.
How does Box Foaming differ from Continuous Slabstock Foaming?
Box Foaming produces individual foam blocks in separate pouring cycles. Continuous Slabstock Foaming feeds the reacting mixture onto a moving forming conveyor to produce a continuous foam bun. The two routes require different production-line arrangements.
Which formulations and block sizes can be processed?
Selection depends on the polyurethane formulation, component ratio, required pour weight, block dimensions and foam rise behavior. Send the material data and production targets so Haifeng can confirm the metering, mixing and box configuration.
When can the foam block be demolded and sliced?
Demolding, curing and conditioning times depend on the formulation and block dimensions. Confirm them through formulation trials before production; machine pouring time is separate from foam curing and downstream slicing time.
What equipment and support are needed for a complete production setup?
The setup may include material conditioning, metering and dynamic mixing, box molds, suitable ventilation, curing space and downstream cutting or slicing equipment. Haifeng can discuss installation, commissioning, operator training and the supply scope for the project.