Special Pumps For TDI

Precision-matched gears mesh within the pump chamber; driven by a servo motor or a variable-frequency drive (VFD), the pump delivers a fixed volume of medium per revolution. Operating on the principle of positive-displacement metering, it ensures a stable flow rate and is synchronized with the polyol pump to deliver components in the correct ratio to the mixing head. As a positive-displacement pump, its flow rate is directly proportional to its rotational speed, and it exhibits minimal pressure pulsation.

Parameters
1. Metering accuracy: ±0.5% to ±1% (under stable operating conditions)-a critical factor for ensuring consistent foaming ratios and preventing defects.
2. Displacement per revolution: 0.79–32 cc/rev; the micro-displacement capability is ideal for precision, low-volume spraying.
3. Continuous operating pressure: Up to 16–20 MPa (160–200 bar), suitable for back-pressure conditions at the mixing head.
4. Viscosity range: 1–8000 cSt (accommodates materials ranging from low-viscosity TDI to high-viscosity polymeric MDI at room temperature).

Typical Applications

- High-pressure PU foaming lines for refrigerators, cold storage units, and insulation panels
- Spray-applied polyurethane (for roofing and tank insulation)
- Elastomer casting, PU adhesives, sealants, and composite panels
- Furan resins, isocyanate prepolymers, and composite material impregnation
- Automotive interior foaming and imitation-wood casting

FAQ:

Q1: Under what conditions is the measurement accuracy of ±0.5% achieved?

A1: It requires stable temperature, constant rotational speed, a stable pressure differential between the inlet and outlet, and a clean, non-crystallizing medium. Significant fluctuations in the pressure differential or crystallization of the medium will increase the margin of error.

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