• Categories:IR Lamp Technologies & News
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• Time of issue:2024-08-07
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(Summary description)The polyester raw material obtained through polymerization is generally processed into flake-like granules approximately 4x5x2 millimeters in size, commonly known as polyester chips. These chips are primarily used as raw materials in various fields, such as fiber production, containers, packaging materials, films, photographic films, and engineering plastics. During the production of staple fibers and melt-blown nonwoven fabrics using polyester (PET) chips, the chips are cut from injection molding strips and contain a significant amount of moisture. Direct heating can lead to hydrolysis, degrading the macromolecules, and easily causing blockages in the feeding zone of the screw extruder. By employing non-contact infrared radiation drying, the moisture content of the chips can be significantly reduced, ensuring a uniform molecular structure and guaranteeing product quality and stability.

 



 

When infrared rays are absorbed by an object, they generate thermal energy. The principle is that when the molecules of a substance absorb infrared energy of a specific wavelength, resonance occurs, causing vibrations of the molecules and atoms, thereby heating the object. Therefore, the more infrared radiation an object absorbs, the more it heats up. For example, water molecules (H₂O) and polyatomic molecules can effectively absorb infrared rays, especially polymer organic substances, which have very broad absorption bands in the infrared region and exhibit strong infrared absorption and resonance characteristics.

 





Currently, the commonly used chip drying equipment for producing PET staple fibers and PET nonwoven fabrics includes batch vacuum dryers or pulse pre-crystallization tower hot air drying devices. These traditional drying methods are relatively energy-intensive. Due to the continuous rise in electricity prices, in order to reduce production costs and save energy, non-contact high-infrared radiation heating is adopted. When the raw material enters the pre-crystallizer, it is immediately and completely surrounded by hot air, preventing adhesion and avoiding chip fragmentation and powder generation during the drying process. The temperature difference within the pre-crystallizer is almost zero, ensuring uniform crystallinity of the raw material and excellent drying results.

 



 

We use quartz infrared heating lamps for the pre-crystallization and drying of PET chips. The infrared heating equipment not only has high thermal efficiency and significantly reduced drying time but also occupies less space, resulting in remarkable energy-saving effects.

 

Advantages of Infrared Drying Technology

Infrared drying technology offers several advantages over traditional drying methods:


Energy Efficiency: Infrared drying is highly efficient as it directly transfers heat to the material, minimizing energy loss. This leads to substantial energy savings, which is crucial in industrial processes where energy costs are a significant factor.
Uniform Heating: The non-contact nature of infrared drying ensures uniform heat distribution across the material. This uniformity is essential in maintaining the quality and consistency of the final product, especially in sensitive materials like PET.
Speed: Infrared drying significantly reduces drying time compared to conventional methods. This increase in processing speed enhances overall production efficiency, allowing for higher throughput and better utilization of equipment.
Space-Saving: Infrared drying equipment tends to be more compact compared to traditional drying systems. This compactness is beneficial for facilities with limited space, enabling more efficient use of the production floor.
Quality Improvement: By preventing moisture-induced degradation and ensuring uniform molecular structure, infrared drying improves the quality and durability of the final product. This is particularly important in applications requiring high-performance materials, such as engineering plastics and advanced fibers.