Optimizing Washing Processes in PET Bottle Recycling
9 patents in this list
Updated:
In PET bottle recycling, contamination levels can reach 2-5% by weight, including adhesives, labels, organic residues, and other materials that affect recyclate quality. Traditional washing processes consume 3-7 cubic meters of water per ton of material while achieving varying degrees of cleanliness—particularly challenging are label adhesives that remain after initial sorting stages.
The fundamental challenge lies in balancing cleaning effectiveness against water consumption, energy usage, and processing throughput in a continuous industrial operation.
This page brings together solutions from recent research—including multi-stage washing systems with ultrasonic cleaning, bubble-based agitation methods, specialized mechanical removal techniques, and water recycling architectures. These and other approaches aim to achieve food-grade recyclate quality while minimizing resource consumption in high-throughput operations.
1. PET Flake Recycling and Cleaning Apparatus with Water Recirculation System
LIUYANG LONGXIANG PLASTIC PRODUCTS CO LTD, 2024
A PET recycling and cleaning device that efficiently cleans and recycles PET bottle flakes while conserving water resources. The device has an overflow tank, a conveyor, a cleaning device, and a draining device. The conveyor transports PET flakes into the cleaning tank. The cleaning device cleans the flakes. Water drains from the flakes into the overflow tank. Excess water is pumped back into the cleaning tank to complete the cycle. This prevents flakes from floating during cleaning and reduces water usage compared to traditional methods.
2. Recycled PET Bottle Cleaning Equipment with Immersion and Ultrasonic Assembly
兴宁市拓展盈辉资源有限公司, XINGNING TUOZHAN YINGHUI RESOURCES CO LTD, 2023
A food-grade recycled PET bottle processing equipment that effectively cleans PET bottles to improve the quality of recycled PET flakes. The equipment uses a specialized assembly inside a housing to clean the bottles. It has a feeding port, bottom filter, cleaning nozzles, and a working extension plate. The assembly allows immersing the bottles in cleaning liquid and ultrasonic cleaning inside the housing to thoroughly remove labels and adhesives. This avoids the issues of incomplete label removal during sorting. The bottles are then conveyed out and picked up for further processing.
3. Device for Cutting and Rotational Brush Cleaning of Waste Plastic Bottles
GUANGZHOU VALUDA GROUP CO LTD, 2023
A recycling and cleaning device for waste plastic bottles that fully cleans the bottles instead of just flushing them. The device cuts the bottles, then cleans the inside and outside using a rotating brush and wash fluid. The cutter feeds bottles into a cleaning chamber where they're rotated and sprayed. The cleaned bottles are collected at the end while waste water exits via a valve.
4. PET Bottle Washing Device with Inversion and Air-Filled Particle Dislodgement Mechanism
ANT SYSTEM CO LTD, 2022
High-speed PET bottle washing device for removing foreign substances from PET bottles to improve hygiene and prevent contamination. The device aligns, inverts, and fills the bottles with air to dislodge any particles inside. Multiple bottles are processed simultaneously by gripping them with pads and rotating them upside down. This allows washing a large batch of bottles quickly to reduce the risk of foreign matter being introduced compared to washing individual bottles.
5. Automated Multi-Stage Washing System for Crushed PET Bottles with Ultrasonic and Bubble Cleaning
LKP CO LTD, 2022
Automated system for washing crushed PET bottles to improve recycling efficiency. The system uses multiple washing stages with ultrasonic cleaning and bubble washing. The stages are: 1) Bubble washing: Crushed bottles are rinsed with a solution containing micro-nano bubbles generated by a bubble generator. 2) Ultrasonic cleaning: The bottles are immersed in a cleaning solution and ultrasonically vibrated to clean. 3) Hot air drying: The washed bottles are blown with hot air to dry. This multi-stage washing process removes contaminants from crushed PET bottles more effectively than conventional methods.
6. Bottle Washing Machine with Vibrating Tank, Rotating Discs, Auxiliary Brush Assembly, and Gas Blowing System
ZHEJIANG TONGHENG EP TECH CO LTD, ZHEJIANG TONGHENG EP TECHNOLOGY CO LTD, 2021
A whole bottle washing machine for producing green and environmentally friendly PET bottle flakes with improved cleaning efficiency. The machine has a vibrating tank, rotating cleaning discs, and an auxiliary brush assembly. It also has a gas blowing system that generates bubbles in the cleaning liquid to enhance mixing and contact between the flakes and cleaning solution.
7. Whole Bottle Cleaning Device with Rotating Agitation and Squeezing Mechanism for PET Bottle Processing
HENGYANG ZHONGHAO PLASTIC PRODUCTS CO LTD, 2020
A whole bottle cleaning device for PET bottle manufacturing that overcomes the issue of efficiently cleaning PET bottles before recycling to improve recycling yield. The device uses a rotating mechanism to agitate and squeeze the bottles in a cleaning tank. A feeding mechanism lifts the bottles into the tank, and a circulation mechanism recirculates the cleaning liquid. This allows thorough cleaning of the bottles without them floating in the liquid. After cleaning, the bottles are conveyed out.
8. Circular Tank System with Integrated Shaking and Rotating Mechanisms for Dual-Sided Cleaning of PET Bottles
WANG SHASHA, 2020
A system for cleaning PET plastic bottles for recycling that effectively cleans both the inside and outside of the bottles. The system uses a circular tank with a driving mechanism, support column, and first water gun to clean the outside of the bottles. The upper end of the tank has a ring cover with a cleaning mechanism inside. The cleaning mechanism has a shaking mechanism, telescopic column, spring top plate, limit rod, rotating branch chain, and angle adjustment branch chain. This allows the upper end of the bottle to be restricted while the first water gun cleans the inside. The shaking mechanism limits and shakes the upper end to prevent bouncing. The rotating branch chain rotates the bottle for full cleaning. The angle adjustment branch chain adjusts the limit rod to move the upper end position. This ensures effective cleaning of both the inside and outside of the bottles.
9. Continuous Water Washing System with Multi-Chamber Wipers and Conveyor Spray Nozzles for PET Bottle Flakes
ZHEJIANG TONGHENG ENVIRONMENTAL PROTECTION TECH CO LTD, ZHEJIANG TONGHENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD, 2020
Green and environmentally friendly continuous water washing system for cleaning PET bottle flakes. The system has two-stage washing with recycling of cleaning water. The first stage involves multiple chambers with moving wipers to clean the flakes. The second stage has conveyors and spray nozzles to further wash the flakes. The washing water is recovered and reused between stages. This improves cleaning compared to single stage washing.