PU Low Pressure Foam Machine for PU Shoe Soles
Low‑pressure PU foaming system for single/dual‑color shoe soles, with casting/spraying modes, ±0.3% accuracy, vacuum defoaming, and intelligent touchscreen control.
Discharge Flow Rate
26～120 g/s
Mix Ratio (A:B)
1:1～1:4 (stepless)
Mixing Head Speed (Casting)
4,000‑10,000 rpm
Metering Accuracy
±0.3%
Product Overview
The HF‑LPM‑2A1B‑F is a low‑pressure PU foaming machine for single/dual‑color shoe soles, with casting/spraying modes, ±0.3% accuracy, and vacuum defoaming.
This low‑pressure polyurethane foaming machine is specially developed for molding single‑color and dual‑color liquid reaction PU shoe soles, including polyester‑based soles, outsoles, midsoles, and insoles for mid‑to‑high‑end leather shoes, casual shoes, walking shoes, and sports footwear. The machine features a 120L dual A/B tank system with optional expandability to 2‑6 components, a low‑pressure mixing head operating at 4,000‑10,000 rpm (casting) or 2,000‑8,000 rpm (spraying with optional spray gun), and a total motor power of 10 kW. The intelligent PLC + touch screen control system enables one‑click formula storage and recall, precise regulation of temperature, pouring volume, and injection duration, with multi‑recipe storage for fast production switching. The machine supports two working modes: Casting Mode (core mass production)—mixed reactive PU materials are poured directly into open or semi‑closed molds, foaming and curing to form dense or microcellular structures with fully bubble‑free finished soles; and Spraying Mode (auxiliary coating)—with optional spray gun, homogenized PU mixture is evenly sprayed onto mold cavities or upper surfaces to form a bonded cushion layer or protective coating. The built‑in vacuum defoaming units in all raw material tanks remove dissolved gas in advance, ensuring cast soles feature compact, pore‑free cross‑sections with uniform internal texture. The mixing head includes automatic self‑cleaning and anti‑solidification functions, reducing manual maintenance and solvent use. The low‑pressure design offers lower initial investment, extended mold life, reduced raw material waste (splash‑free, flashless pouring), and lower long‑term electricity consumption.
Production Workflow
Material Preparation & Vacuum Defoaming
Load polyol and isocyanate into 120L tanks; activate built‑in vacuum defoaming units to remove dissolved gas from raw materials.
Recipe Selection & Parameter Setting
Choose stored recipe on PLC touch screen; set A:B ratio (1:1‑1:4) and discharge flow (26‑120 g/s) per sole type.
Pouring/Spraying & Curing
For casting: pour mixed PU into open/semi‑closed molds, filling from bottom to top to discharge trapped air; for spraying: atomize and apply onto mold or upper surface. Allow to foam and cure.
Demolding, Trimming & Self‑Cleaning
Demold finished sole; automatic mixing head self‑cleaning and anti‑solidification cycle prepares the system for the next production run.
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Contact UsTechnical Specifications
Specifications are based on standard configurations. Customizable component counts (2‑6), optional spray gun assembly, and multi‑component material supply modules available.
| Technical Parameter | HF-LPM-2A1B-F (Customizable; standard 2-component A&B system, expandable to 2~6 material components upon request) |
|---|---|
| Discharge Flow Rate | 26–120 g/s |
| Raw Material Mix Ratio | A:B = 1:1–1:4 (stepless adjustable) |
| Tank Volume | 120 L per tank (standard dual A&B tanks; extra tanks available for multi-component customization) |
| Total Motor Power | 10 kW (aggregate power for metering pumps, mixing head, tank stirring & vacuum defoaming system) |
| Mixing Head Rotational Speed | Casting mode: 4,000–10,000 rpm (adjustable)Spraying mode: 2,000–8,000 rpm (adjustable, with optional dedicated spray gun assembly) |
| Metering Accuracy | ±0.3% |
| Core Features | Rapid color & raw material switching system; bubble-free casting finish; excellent scratch & abrasion resistance; anti-fatigue cracking performance; energy-saving low-power design; precise proportional metering; intelligent touchscreen control; time & labor saving; high automation expandability |
| Warranty Period | 1 year whole machine warranty |
| Net Weight | 1,000 kg |
| Certifications | CE certification, EN 60204-1 electrical safety standard, ISO 9001 Quality Management System Certification |
| Brand Name | Haifeng |
Key Advantages
Six engineering and production benefits that deliver bubble‑free, wear‑resistant, and cost‑effective PU shoe sole manufacturing with exceptional flexibility.
Flexible Production & Fast Style Switching
Color replacement and internal cleaning completed within minutes. Supports dual‑color, striped, and gradient‑color soles with dual‑density modules for multi‑hardness zones on a single sole—covering sports midsoles, outdoor outsoles, and casual soles.
Optimized System for Bubble‑Free Cast Soles
Stable laminar flow fills molds from bottom to top, discharging trapped air. Built‑in vacuum defoaming in all tanks removes dissolved gas, delivering compact, pore‑free cross‑sections with uniform internal texture.
Outstanding Wear Resistance & Anti‑Cracking Performance
PU material abrasion resistance 3‑5× higher than rubber; scratch resistance far exceeds coated soles. Maintains flexible elasticity without cracking at toe flex points—ideal for sports shoes and labor protection footwear.
Intelligent Touchscreen Control, Low Labor Dependency
One‑click formula storage and recall. General operators can complete full production without senior technicians. Automatic self‑cleaning and anti‑solidification functions reduce manual disassembly and solvent washing.
Low Investment & Lower Long‑Term Operating Cost
Purchase cost much lower than high‑pressure equipment. Molds experience lower internal pressure, extending service life. Splash‑free, flashless pouring minimizes raw material waste, and low power consumption cuts electricity costs.
Strong Compatibility with Automated Production Lines
Integrates with circular/banana conveyor lines, pneumatic automatic mold frames, and robotic pouring arms for fully unmanned continuous mass production, drastically reducing labor costs.
Start Your Premium PU Sole Production Today
Haifeng supplies full‑series PU foaming equipment, professional sole molds, and turnkey production line solutions—covering process evaluation, equipment selection, installation, operator training, and full‑lifecycle after‑sales support.
Industries & Applications
The HF‑LPM‑2A1B‑F is specially developed for molding single‑color and dual‑color PU shoe soles, including polyester‑based PU soles, outsoles, midsoles, and insoles for mid‑to‑high‑end leather shoes, casual shoes, walking shoes, and sports footwear. It supports small‑batch sampling with low‑cost standard metal or resin molds, as well as mass automated production when matched with circular production lines and automatic cycling molds.
Download the Full Technical Brochure & PU Sole Production Guide
Request Specs & PricingComplete Your Production Line
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