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擠出PET有光改性料低濕高結(jié)晶設(shè)備
- **Heating and Humidity Control Systems**
- **Heating System**: As mentioned above, it includes electric heating, heat transfer oil heating, and steam heating methods. The heating system needs to accurately control the temperature of the hot air to ensure that the PET particles are heated evenly and reach the required crystallization and drying temperatures. For example, electric heating can achieve a temperature control accuracy of ±1°C, which is suitable for small-scale equipment; heat transfer oil heating is suitable for large-scale equipment due to its stable heat output and energy-saving characteristics; steam heating has a lower cost but is limited by the upper temperature limit (usually ≤ 180°C).
- **Humidity Control System**: Mainly through dehumidification equipment such as molecular sieve dehumidifiers to obtain low-dew-point hot air. The dew point of the hot air is an important parameter. A lower dew point (such as ≤ - 60°C) can accelerate the drying rate of the materials and reduce the equilibrium moisture content of the materials. In actual production, the dew point value is adjusted according to the type of materials and process requirements. For example, for extrusion molding, a dew point value of less than - 40°C can usually meet the requirement that the moisture content of the dried raw materials is less than 200 ppm.
- **Air Circulation and Dust Removal Systems**
- **Air Circulation System**: Ensures the continuous circulation of hot air in the pre-crystallization and drying units to maintain stable process conditions. In the fluidized bed and drying tower, appropriate air velocities need to be maintained (such as 5 - 10 m/s in the fluidized bed) to ensure that the particles are in a good suspension state or fully contact with the hot air, but at the same time, the problem of excessive dust generation caused by too high a wind speed needs to be considered.
- **Dust Removal System**: During the processing of PET particles, especially in the fluidized bed and drying processes, there may be situations such as particle friction and fragmentation, resulting in the generation of dust. The dust removal system, such as a cyclone separator or a bag filter, is used to remove dust from the hot air or the particle flow to prevent dust from affecting the quality of the products and the normal operation of the equipment, and at the same time, it is also beneficial to environmental protection and equipment maintenance.
### Types of Equipment
