The quality of recycled PET bottle flakes directly affects the profit level, so improving the quality of recycled PET bottle flakes is a crucial part of the PET recycling industry. The key to improving the quality of recycled PET bottle flakes lies in optimizing the process of the PET washing line, especially in handling humidity, PVC content, and characteristic viscosity.
Improving PET Bottle Flake Quality With PET Washing Line
Humidity Management
Moisture is one of the most important factors affecting the quality of recycled PET bottle flakes. Excessive moisture content affects product performance and processing. Therefore, the moisture content of PET bottle flakes should be minimized after washing.
For this purpose, it is recommended to use dewatering and drying equipment, such as a PET flakes dryer machine, or, if there are higher requirements, a drying tube or an air sorter, to reduce the moisture content to less than 5 percent.
PVC Content Control
Waste PET bottles have a high PVC content, mainly in the form of label paper. To ensure the quality of recycled PET bottle flakes, the PVC must be completely removed before processing. This can be achieved by a plastic bottle label removing machine, which has a de-labelling rate of over 98%.
Afterward, a sink float plastic separation can separate the residual PVC fragments. In addition, the addition of cleaning powder to the hot washing tank can further reduce the PVC content and ensure the production of higher-quality recycled PET bottle flakes.
Characteristic Viscosity Management
Characteristic viscosity is one of the important indexes of recycled PET bottle flakes, and an excessive cleaning process will lead to a change in physical properties, especially a decrease in viscosity. To avoid this situation, it is necessary to control the amount of caustic soda and the washing time during the washing process to ensure that the characteristic viscosity of bottle flakes is stable. It is usually recommended that the processing time in the hot washing tank should not exceed 45 minutes to maintain the stability and consistency of the product.
Conclusion
In summary, optimizing the PET washing line process is the key to improving the quality of recycled PET bottle flakes. By reasonably managing humidity, and controlling PVC content and characteristic viscosity, we can produce higher quality recycled PET bottle flakes, improve profit level, and at the same time make a positive contribution to environmental protection.