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ZHEJIANG BORETECH ENVIRONMENTAL ENGINEERING CO., LTD.

The recycling process is essential for deodorizing recycled plastics




PCR (Post Consumer Recycled Material) is generally a material that is pre-processed, disassembled, sorted, crushed, cleaned, melted, and re-pelletized from plastic products that are recycled after consumption. PCR recycled plastics have many advantages in the environment, and follow the global trend of carbon neutrality, environmental requirements for carbon reduction, and environmental awareness, but they may have some odor issues, because recycled waste plastic may contain dirt, chemical residue, or other odors, such as PET bottles that have been left unused for a long time, PP lunch boxes that have contained dishes, HDPE milk bottles, etc. Driven by global brand’ s announcement, the proportion of recycled plastics used has steadily increased in demand. To pursue quantity while ensure quality, It’s urgently to improve high-quality, high-performance, and sufficient PCR recycled plastics that meet the requirements of end brands. But it is because these recycled plastic products may have odor issues that it not only affects their reuse value, but also may cause discomfort to users. This poses challenges for many brands to implement carbon reduction and increase the proportion of recycled plastics.





The total solution of plastic recycling from BoReTech ensures that the recycled plastic is pre-sorted well and customized design according to the different plastic characteristics. Through self-developed plastic washing process, pre-heating, devolatilization technology, extrusion, and solid-state polycondensation (SSP) , deodorization processes for pellets, multiple processes are carried out to address the issue of odor, and appropriate methods and technologies are selected to gradually remove the odor in the plastic, thus reducing the impact of odor on the quality of recycled plastics.


Deodorizing during the hot washing and rinsing 

Thorough washing and rinsing of PCR recycled plastics is crucial. A key aspect of post-consumer plastic recycling is the removal of impurities that are mixed during the process from the production factory to the recycling factory. Based on over 30 years of production experience in plastic recycling industry, BoReTech has gained an understanding of the core characteristics of different impurities among plastics. During plastic washing process, mainly pollutants are removed from recycled plastics. Each process design concept aims to create the best environment to separate impurities:

By using processes such as bottle pre-washing, automatic sorting, crushing, floatation, hot washing, and rinsing, combined with a corresponding washing detergent, the plastic or PET flakes can better remove pollutants and odorous substances attached to the surface of the plastic flakes by soaking, friction washing;

Control the appropriate washing temperature through heating in bottle pre-washing and hot washing process to help remove some volatile odors;

The cleanliness of the recycling water affects the plastic flakes quality. BoReTech is equipped with an optional inline water circulation system in each washing process. Reusing the filtered water to flush and rinse the plastic flakes, washing and odor removal efficiency can be improved.



Deodorization during extrusion and pelletizing

Pre-treatment of recycling plastic such as drying before extrusion: heating or hot air can be used to promote the volatilization of volatile odors, or a highly efficient vacuum system can be introduced into the drying equipment to promote the volatilization of odors and accelerate the removal of odors through pressure reduction;

Vacuum devolatilization: During the plastic extrusion process, control the appropriate temperature to ensure the melting state of the plastic and promote the volatilization of odorous and VOCs. Through vacuum pumping operation, volatile odorous substances can be volatilized from the plastic, reducing the residual odor;

Use deodorants or adsorbents: Add appropriate adsorbents or deodorants, such as activated carbon, zeolite, etc., to contact, adsorb, and neutralize odorous substances;


Recycled plastic pellets deodorization

Normally to use hot air to promote the volatilization of volatile odors, and for rPET chips, they can also be decontaminated and deodorized through solid state polymerization process.


With years of industry cultivation and accumulation, BoReTech integrates global advantageous resources from various processes such as recycling classification, sorting, washing, extrusion and pelletizing, SSP, etc. Through scientific research and innovation, it focuses on solving the quality, performance, impurities, production capacity, color, odor, and many other pain points of recycled PCR plastic. It provides customers with a total solution covering the entire process from plastics washing, pelletizing, SSP, and supplies economical, efficient, energy-saving, high-quality PET bottle recycling lines. It has realized the best choice of path and equipment for small and medium-sized enterprises to achieve closed-loop peer recycling and participate in the green and low Carbon cycle, and has also contributed to enabling carbon emission reduction in various industries and fields and the goal of global carbon neutrality.





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