Low-Pressure PU Foaming Machine | 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.
The HF-LPM-2A1B-F is a low-pressure PU foaming machine for molding single and dual-color shoe soles—polyester-based soles, outsoles, midsoles, and insoles for mid-to-high-end leather, casual, walking, and sports footwear. It features a 120L dual A/B tank system, expandable to 2–6 components, a low-pressure mixing head running at 4,000–10,000 rpm (casting) or 2,000–8,000 rpm (spraying), and 10 kW total power. PLC + touch screen enables one-click formula storage and recall with precise control of temperature, pouring volume, and injection duration. It supports Casting Mode—pouring mixed PU into open or semi-closed molds for dense or microcellular, bubble-free soles—and Spraying Mode for coating mold cavities or upper surfaces with an optional spray gun. Built-in vacuum defoaming units remove dissolved gas in advance, ensuring compact, pore-free cross-sections. The self-cleaning, anti-solidification mixing head reduces manual maintenance and solvent use. Low-pressure design offers lower investment, longer mold life, and reduced waste and energy 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.
Technical 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 |
|---|---|
| Discharge Flow Rate | 26–120 g/s |
| Raw Material Mix Ratio | A:B = 1:1–1:4 |
| Tank Volume | 120 L per tank |
| Total Motor Power | 10 kW |
| 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 | Bubble-free casting finish, fast color switching, precise metering, anti-cracking, energy-saving |
| Warranty Period | 1 year whole machine warranty |
| Net Weight | 1,000 kg |
| Certifications | Confirm applicable documents for the quoted configuration |
| 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.
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