What is the function of cyclopentane series polyurethane high pressure foaming injection machine?

1. Function of the Cyclopentane Series Polyurethane High-Pressure Foaming Injection Machine
The Cyclopentane Series Polyurethane High-Pressure Foaming Injection Machine is designed specifically for the high-pressure foaming process of polyurethane (PU) using cyclopentane as the blowing agent. It is widely used in the production of insulation materials for industries such as refrigerators, freezers, and automotive interiors. Because cyclopentane is flammable and explosive, this type of equipment must meet strict explosion-proof safety standards.

2. Core Functions and Features
High-Pressure Mixing System: Utilizes high-pressure impingement mixing technology (typically in the pressure range of 100-200 bar) to ensure thorough mixing of cyclopentane with polyurethane raw materials (isocyanates, polyols, etc.), forming a uniform foam.
Explosion-Proof Design: The equipment must be certified by international explosion-proof standards such as ATEX or IECEx and equipped with explosion-proof motors, electrical components, and a gas leak monitoring device.
Precise Temperature Control: Cyclopentane's volatility and foaming reaction are temperature-sensitive, requiring the equipment to have a high-precision temperature control system (±1°C). Automation Control: PLC or industrial computer control enables digital parameter adjustment (such as flow, pressure, and ratio), supporting recipe storage and process traceability.

3. Typical Application Areas
Home Appliance Industry: Foam insulation for refrigerators and freezers.
Automotive Industry: Filling materials for seats, dashboards, ceilings, etc.
Building Insulation: Pipe and wall insulation (requires a cyclopentane formulation).

4. Safety Precautions
Environmental Requirements: Production areas must be explosion-proof and ventilated. Open flames and static sparks are prohibited.
Equipment Maintenance: Regularly inspect seals, explosion-proof components, and gas detectors.
Operation Training: Personnel must be familiar with the properties of cyclopentane and emergency response procedures.

5. Common Troubleshooting Issues with Cyclopentane Series Polyurethane High-Pressure Foaming Injection Machines

(1) Mixing and foaming problems
Uneven mixing (coarse foam pores/collapsed foam)
Reason: high-pressure mixing head is clogged, raw material ratio is unbalanced (excessive cyclopentane), temperature fluctuation.
Solution: Clean the mixing head; calibrate the metering pump; check the raw material ratio and temperature control system.

Abnormal foaming speed (too fast or too slow)
Reason: incorrect catalyst ratio, insufficient cyclopentane purity, changes in ambient temperature and humidity.
Solution: Adjust the catalyst dosage; test the cyclopentane quality; control the environmental conditions (recommended 25±3℃, humidity <60%).

(2) Mechanical failure of equipment
Unstable metering pump flow
Reason: pump body seal wear, hydraulic system pressure fluctuation, filter clogged.
Solution: Replace seals; check the hydraulic oil circuit; clean or replace the filter (recommended maintenance every 500 hours).

High-pressure pipeline leakage
Reason: aging of the seal ring (especially the isocyanate pipeline) and loose joints. Solution: Immediately stop the machine and replace the explosion-proof seal (chemically resistant materials such as polytetrafluoroethylene are required).

(3) Safety system alarm
Cyclopentane concentration alarm
Cause: Pipeline leakage, ventilation system failure or sensor false alarm.
Solution: Start emergency exhaust; check the leak point (use soap solution to detect); calibrate or replace the gas detector.

Explosion-proof motor overheating
Cause: Poor heat dissipation, excessive load or bearing damage.
Solution: Clean the cooling fan; check the motor load; lubricate or replace the bearing.

(4) Electrical and control failure
PLC program error
Cause: Signal interference, sensor failure, software logic error.
Solution: Ground and shield the signal line; check the pressure/temperature sensor; restart or reset the PLC program.

Touch screen unresponsive
Cause: Static interference, system freeze or screen damage.
Solution: Power off and restart; check the grounding; replace the touch screen (explosion-proof model required).