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Infrared heating technology to dry polyester chips
- Categories:IR Lamp Technologies & News
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- Time of issue:2024-05-27
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(Summary description)When producing short fibers and meltblown nonwovens using polyester (PET) chips, drying the chips is crucial. The chips are amorphous polymers with a low softening point and contain a significant amount of water before drying.
Infrared heating technology to dry polyester chips
Infrared heating technology to dry polyester chips
Infrared heating technology to dry polyester chips
(Summary description)When producing short fibers and meltblown nonwovens using polyester (PET) chips, drying the chips is crucial. The chips are amorphous polymers with a low softening point and contain a significant amount of water before drying.
- Categories:IR Lamp Technologies & News
- Author:
- Origin:
- Time of issue:2024-05-27
- Views:0
When producing short fibers and meltblown nonwovens using polyester (PET) chips, drying the chips is crucial. The chips are amorphous polymers with a low softening point and contain a significant amount of water before drying. By drying, the moisture content of the chips can be reduced, making the molecular structure uniform, thereby ensuring product quality and production stability. Currently, domestic PET chip drying equipment primarily uses vacuum drying or hot air drying as the main heating methods. For small fiber manufacturers, energy consumption is higher. The challenge is to reduce energy consumption while adopting more efficient and cleaner heating methods. Quartz infrared radiators can match the wavelength absorption of moisture, precisely control the heating temperature, and save energy.
Infrared heating drying involves the infrared rays emitted by infrared radiation elements being absorbed by the heated object and directly converted into thermal energy to achieve heating and drying.
Infrared rays are electromagnetic waves between visible light and microwaves, with a wavelength range of 0.76 to 1000 μm. Infrared rays can be absorbed by objects and generate thermal energy. The principle is that material molecules absorb infrared energy of a certain wavelength, resonate, and cause vibration of molecular atoms, thus heating the object. Therefore, the more infrared rays an object absorbs, the easier it is to heat. For example, water molecules (H2O) and polyatomic molecules can effectively absorb infrared rays, especially polymer organic substances, which have broad absorption bands in the infrared region. They have a strong ability to absorb infrared rays and produce strong resonance phenomena. Based on this principle, the heating process of the original polymer material of PET chips is shortened from tens of minutes to a few minutes.
The heating distance between the quartz infrared radiator and the material plate affects the moisture content of the dried chips. By installing the infrared radiator above the material plate, different power infrared heating is arranged for the feeding area, drying area, and discharging area, with zoned heating and temperature control. During the drying process, uneven feeding can cause adhesion between chips. By adjusting the distance between the material plate and the heater, generally, the larger the distance, the lower the temperature of the material plate, and the higher the moisture content of the chips. Therefore, when adjusting the distance between the infrared radiator and the material plate, the inlet and outlet speeds should be correspondingly controlled to adjust the drying time to ensure the drying effect.
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