Cap and Label Removal Techniques in PET Bottle Recycling
9 patents in this list
Updated:
PET bottle recycling faces a critical challenge in component separation: caps are typically made from PP or HDPE, labels use diverse materials including PVC and paper, and adhesives can contaminate the PET stream. Current recycling lines process 50,000 to 200,000 bottles per hour, yet incomplete separation of these components can reduce the quality of recycled PET by up to 40% and increase processing costs significantly.
The fundamental challenge lies in developing automated separation methods that can handle high throughput while achieving the material purity needed for food-grade recycled PET.
This page brings together solutions from recent research—including robotic cap removal systems, label separation through targeted heating and mechanical action, and integrated sorting technologies that detect and separate different polymer types. These and other approaches aim to improve recycling efficiency while maintaining the quality standards required for bottle-to-bottle recycling.
1. Hot Melt Recycling Device with Integrated Cleaning and Cap Removal for PET Bottles
JIANGSU XIAOMAYI ENVIRONMENTAL PROT MACHINERY CO LTD, JIANGSU XIAOMAYI ENVIRONMENTAL PROTECTION MACHINERY CO LTD, 2023
A hot melt recycling device for PET injection molded plastic bottles that allows efficient recycling of whole bottles without removing caps. The device has a cleaning unit to remove caps and impurities from the bottles, followed by a hot melt unit to process the cleaned bottles. The cleaning unit uses water spray, baffles, and pneumatic assistance to remove caps and impurities. The hot melt unit crushes the bottles and melts the fragments. The device aims to improve recycling efficiency and quality by cleaning the bottles thoroughly before melting to prevent impurities from affecting the hot melt process.
2. Plastic Bottle Recycling System with Pre-Crushing Label and Cap Removal Mechanism
ZHEJIANG WOOSIYUAN COMMUNICATION TECH CO LTD, ZHEJIANG WOOSIYUAN COMMUNICATION TECHNOLOGY CO LTD, 2023
A plastic bottle recycling system and method to improve efficiency of recycling PET bottles by separating the label and cap before crushing. The system has a sorting device to feed bottles, a positioning device to align them, and a crushing device. The method involves feeding bottles, sorting them to align directions, removing labels and caps, and crushing the separated bodies. This separates different plastic types and prevents contamination during recycling.
3. PET Bottle Recycling Machine with Arc-Shaped Slot and Telescopic Rod for Automated Label Removal
FUJIAN YUANTONG MACHINERY IND AND TRADE CO LTD, FUJIAN YUANTONG MACHINERY INDUSTRY AND TRADE CO LTD, 2023
A PET bottle recycling machine that automates removing labels from PET bottles to make recycling more efficient. The machine has a feeding plate at the top, followed by a limiting structure with an arc-shaped slot. As bottles enter vertically, they slide down the inner ring plate into the arc-shaped slot. The arc guides the bottles to prevent them from tilting. A hydraulic pump extends a telescopic rod to push the bottles downward. At the bottom, a fitting plate squeezes the bottle bodies to lower them. A cutter head removes the labels as the bottles move. A triangular block collects the labels. The arc-shaped drawer slides out to collect the cut labels. A rotating cover prevents labels from escaping when the drawer is pulled out.
4. Automated Plastic Bottle Recycling Machine with Transmission-Driven Twisting and Cutting Mechanisms for Component Separation
WANLVDA RENEWABLE RESOURCES UTILIZATION CO LTD, WANLVDA TIANJIN RENEWABLE RESOURCES UTILIZATION CO LTD, 2023
Automated plastic bottle recycling machine that separates bottle caps, bodies, and labels without manual intervention. The machine has a twisting mechanism driven by a transmission that separates the bottle parts. It clamps the bottle, twists it to separate the label, then cuts it off. This automates the separation process compared to manual labor. The transmission mechanism drives the twisting mechanisms to twist the bottle body in opposite directions to separate the label. A cutting mechanism removes the label once it's separated.
5. Automated PET Bottle Component Separation Machine with Sensor-Based Material and Color Verification
YEDITEPE UENIVERSITESI, YEDİTEPE ÜNİVERSİTESİ, 2022
Automated recycling machine that separates components from PET bottles and makes them ready for recycling. The machine uses sensors, cameras, and processors to check if bottles are PET and the right color. If not, it drops them back for return. The machine then cuts the neck to separate the bottle from cap and ring. It softens labels to remove them. The separated components go to containers. The machine can also dissolve label adhesive. It has a touchscreen, RFID reader, lighting, and wheels for user interaction, deposit loading, and mobility.
6. Automated PET Bottle Pre-Processing Device with Robotic Cap Removal, Label Separation, and Compression Mechanisms
华中科技大学, HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, 2022
PET bottle recycling device that automates the pre-processing steps of removing caps and labels from PET bottles for recycling. The device uses robotic mechanisms to clamp the bottle, separate the cap, remove the label, and compress the bottle body. It has a clamping claw, screw cap remover, de-labeling mechanism, and compression mechanism. The robotic actions are coordinated using motors, gears, and sensors to efficiently and reliably prepare PET bottles for recycling.
7. Recycling Device with Conveyor, Cap Stripping, Lid Opening, and Water Dumping Mechanisms for Plastic Bottles
扬州金霞塑胶有限公司, YANGZHOU JINXIA PLASTIC CO LTD, 2021
Recycling device for efficiently emptying and processing waste plastic bottles like mineral water bottles to enable automated recycling of plastic bottles with remaining water. The device has features like a conveyor belt to move bottles, a stripping mechanism to remove caps, a lid opening mechanism to access the bottle contents, and a water dumping section to empty the bottles. This allows automated processing of wet bottles without manual draining. The device also has a collection box for the emptied water and a separate box for the raw materials.
8. Automated Contaminated Plastic Bottle Recycling System with Integrated Cutting, Cleaning, and Separation Mechanisms
XIAMEN LEISI TRADE CO LTD, 2021
A waste plastic bottle recycling system that efficiently processes contaminated plastic bottles for recycling. The system has a machine with a feeding slot, a conveyor, cutting mechanism, and cleaning components. When a bottle is inserted, sensors trigger the machine to clamp, cut, and clean the bottle. The conveyor moves the bottle through stages to separate cap, cut body, and extract impurities. It uses motors, gears, slides, and electromagnets to automate the process. The system can efficiently recycle plastic bottles with impurities by cutting, cleaning, and separating caps.
9. PET Bottle Recycling System with Rotating Blade Label Separator, Cap Peeling Mechanism, and Hot Air Bottle Shrinker
GUANGXI WUZHOU GUOLONG REGENERATION RESOURCE DEV CO LTD, GUANGXI WUZHOU GUOLONG REGENERATION RESOURCE DEVELOPMENT CO LTD, 2021
Recycling process for PET plastic bottles that reduces damage to the bottles during recycling. The process involves separating the label paper from the bottle, peeling off the cap, and shrinking the bottle size. A device inside the recycling machine separates the label paper using a rotating blade. Another device clamps the cap and peels it off. A hot air blower inside the machine shrinks the bottle size. This allows the bottles to be compacted and discharged without getting caught in the machinery.