Low-Pressure PU Foaming Machine | Shoe Insoles
Low-pressure PU foaming system for insoles & midsoles, with 3-5 min fast color switching, anti-blocking needle-valve head, ±0.3% accuracy, and PLC control.
Discharge Flow Rate
30～85 g/s (adjustable)
Mix Ratio (A:B)
1:1～1:4 (adjustable)
Mixing Head Speed
4,000‑10,000 rpm
Metering Accuracy
±0.3%
Product Overview
The HF-LPM-2A1B-F is a low-pressure PU foaming system for insoles/midsoles, featuring fast color switching (3-5 min), anti-blocking needle-valve head, and ±0.3% accuracy.
The HF-LPM-2A1B-F is a low-pressure PU foaming machine for single and dual-color insoles—memory, rebound, antibacterial, midsoles, arch supports, and orthotic insoles—supporting MDI/TDI systems and rigid or soft formulations. Mixed PU is poured into open or semi-closed molds, then cured, demolded, and trimmed. The machine features a 120L tank, discharge flow of 30–85 g/s, adjustable A:B ratio of 1:1–1:4, and a mixing head speed of 4,000–10,000 rpm. The low-residence mixing head and fast-cleaning valve group enable color/material switching within 3–5 minutes, cutting cleaning time and waste by 30%–50%. The self-cleaning needle-valve head scrapes residual material after each shot, preventing blockage, while closed-loop micro-flow control keeps ±0.3% accuracy at small discharge volumes. PLC + touch screen stores recipes for one-click switching and integrates with automatic production lines. Compact, energy-saving 8 kW design lowers investment for insole OEMs and startups.
Production Workflow
Material Preparation & Recipe Selection
Load polyol and isocyanate into 120L tanks; select desired recipe on PLC touch screen and set ratio (1:1‑1:4) and flow (30‑85 g/s).
Fast Color/Material Switching (if needed)
Activate fast‑cleaning valve group and low‑residence mixing head for color/material changeover; completes within 3‑5 minutes.
Precision Pouring into Molds
Mixed PU material is poured into open/semi‑closed molds via self‑cleaning needle‑valve injection head; residual material automatically scraped clean after each shot.
Curing, Demolding & Automatic Cleaning
Allow insole to cure; demold finished part; self‑cleaning mechanism and low‑residence channels prepare the head for the next cycle, preventing blockages.
Technical Specifications
Specifications are based on standard configurations. Customizable component counts (2‑6) and optional automated production line integration available.
| Technical Parameter | HF-LPM-2A1B-F |
|---|---|
| Discharge Flow Rate | 30–85 g/s (adjustable) |
| Raw Material Mix Ratio | A:B = 1:1–1:4 (adjustable) |
| Raw Material Tank Volume | 120 L per tank |
| Total Motor Power | 8 kW |
| Mixing Head Rotational Speed | 4,000–10,000 rpm (adjustable) |
| Metering Accuracy | ±0.3% |
| Overall Machine Weight | 1,000 kg |
| Warranty Period | 1 year |
| Compliance Certifications | Confirm applicable documents for the quoted configuration |
Key Advantages
Six engineering and production benefits designed specifically for multi‑variety, small‑batch insole manufacturing with fast changeover and low operating costs.
Fast Color & Material Switching System
Low‑residence‑volume mixing head and fast‑cleaning valve group enable color/material changeover within 3‑5 minutes, reducing cleaning time and material waste by 30%‑50% compared to general‑purpose machines.
Anti‑Blocking Dedicated Design
Self‑cleaning needle‑valve injection head with low‑residence flow channels automatically scrapes residual materials after each shot, preventing blockages during frequent start‑stop cycles typical of insole production.
Closed‑Loop Micro‑Flow Control
Ensures accurate mixing ratio (±0.3%) even under small discharge volumes (as low as 30 g/s), effectively reducing reject rates from nozzle blockage and ratio drift.
High Automation Compatibility
Integrates with circular/banana‑type production lines, pneumatic automatic mold opening/closing systems, and robotic casting arms for highly automated continuous production, greatly reducing labor costs.
Energy‑Saving, Low Consumption & Easy Maintenance
Compact layout with only 8 kW rated power for low operating energy costs. Modular pipeline design allows users to clean and replace sealing parts independently, with significantly lower maintenance costs than high‑pressure machines.
Wide Material & Product Compatibility
Supports MDI and TDI systems, rigid and soft foaming formulations. Produces PU memory insoles, high‑rebound insoles, medical orthotic insoles, arch supports, midsoles, and more for the full footwear market.
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Integrate the product with our full range of auxiliary equipment for a turnkey polyurethane processing system.
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