Low-Pressure PU Foaming Machine | Self-Skinning Armrests
Low‑pressure PU system for self‑skinning armrests, with one‑step molding, servo precision metering (±0.3%), sealed tanks, and flexible multi‑model production.
Discharge Flow Rate
50～280 g/s
Mix Ratio (A:B)
100 : 50~150
Mixing Head Speed
5,200 rpm (adjustable)
Metering Accuracy
±0.3%
Product Overview
The HF‑LPM‑1A1B‑A is a low‑pressure PU system for self‑skinning armrests, featuring one‑step molding, servo metering (±0.3%), and sealed tanks for stability.
The HF-LPM-1A1B-A is a low-pressure PU foaming system for self-skinning armrests, forming a dense outer skin and soft foam core in a single molding cycle—eliminating secondary fabric or leather wrapping. It serves automotive interiors, office chairs, wheelchairs, medical rehabilitation equipment, and fitness gear. The machine features a 200L tank system, discharge flow of 50–280 g/s, adjustable A:B ratio of 100:50–150, and a mixing head speed of 5,200 rpm. Servo direct-drive metering pumps, with optional Coriolis mass flowmeter for closed-loop control, maintain ±0.3% accuracy by compensating for viscosity-related flow drift. The fully sealed tanks isolate ambient moisture—especially critical for isocyanate—preventing viscosity rise, reduced reactivity, and bubble defects. Finished armrests offer soft, elastic surfaces with strong compression, impact, abrasion, and oil resistance for frequently touched, easily soiled applications.
Production Workflow
Material Loading & Sealed Tank Preparation
Load polyol and isocyanate into fully sealed 200L tanks, protecting isocyanate from ambient moisture to maintain reactivity.
Recipe Selection & Parameter Setting
Choose stored formula on PLC touch screen; set A:B ratio (100:50‑150) and flow rate (50‑280 g/s) per armrest type.
One‑Step Self‑Skinning Pouring
PU material is poured into the mold in a single shot; outer skin densifies while inner core remains soft during reaction—achieving one‑step molding.
Demolding & Finished Product
Open mold; remove finished self‑skinning armrest with dense outer skin and soft core—no secondary covering required.
Technical Specifications
Specifications are based on standard configurations. Customizable component counts (2‑6) and optional Coriolis mass flowmeter for closed‑loop control available.
| Technical Parameter | HF-LPM-1A1B-A |
|---|---|
| Discharge Flow Rate | 50–280 g/s |
| Raw Material Mix Ratio | A:B = 100:50–150 |
| Tank Volume | 200 L |
| Total Motor Power | 11 kW |
| Mixing Head Rotational Speed | 5,200 rpm (adjustable) |
| Metering Accuracy | ±0.3% |
| Core Features | One-step molding, precise ratio control, sealed tanks, multi-model flexible production |
| Warranty Period | 1 year |
| 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 premium self‑skinning armrests with one‑step molding, comfortable hand feel, and flexible multi‑model production.
One‑Step Molding Without Secondary Covering
Self‑skinning process forms dense outer skin and soft core in a single cycle. Skin and core bond naturally, eliminating fabric/leather wrapping—cutting steps, labor, and avoiding blistering/peeling defects.
Comfortable Hand Feel & Balanced Physical Performance
Soft, elastic surfaces with outstanding compression, impact, abrasion, and oil resistance. Hard‑skin & soft‑core structure delivers reliable support and long‑wearing comfort for frequently touched, soiled applications.
Wide Adjustable Parameters for Flexible Multi‑Model Switching
Both flow rate and mixing ratio are adjustable on demand. A single machine produces light soft office armrests and thick supportive wheelchair/automotive armrests—lowering equipment investment and changeover time.
Precision Ratio Control Optimized for Low‑Weight Parts
Servo direct‑drive metering pumps with optional Coriolis mass flowmeter provide ±0.3% accuracy. Real‑time flow monitoring and PLC compensation ensure stable internal mechanical performance despite viscosity fluctuations.
Sealed Tanks for Consistent Raw Material Stability
Fully sealed structure isolates ambient moisture—critical for isocyanates—preventing viscosity rise, reduced reactivity, and bubble defects, maintaining raw material condition during long continuous production.
Versatile for Multiple Industries & Product Types
Produces automotive armrests, office chair armrests, wheelchair armrests, medical rehab handrails, and fitness equipment grips. Also adaptable for other human support/grip components with similar structures.
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