Problem Statement

Waste plastic is increasing rapidly, while many plastics are difficult to recycle effectively. Mixed or contaminated plastics can also affect the quality and strength of 3D-printing filament and may damage the processing equipment. Therefore, there is a need for an automated system that identifies the selected plastic, detects unwanted/contaminated plastic using sensors, automatically stops the machine when contamination is detected, and converts suitable waste plastic into reusable 3D-printing filament.

Solution

Sensor-based plastic identification, automatic contamination detection, and shutdown system for converting suitable waste plastic into 3D-printing filament.

In Detail

The proposed system converts suitable waste plastic into 3D-printing filament while preventing contaminated or unwanted plastic from entering the extrusion process. 1.) Plastic collection & sorting – Collect waste plastic and select the required plastic type. Plastic identification – A NIR sensor identifies the type of plastics. 3.) Automatic control – An Arduino receives the sensor signal and makes the decision. 4.)Automatic shutdown – If contamination is detected, the Arduino activates a relay to stop the motor/heater and gives a buzzer alert. 5.)Shredding – Approved plastic is shredded into small flakes. 6.)Drying – Moisture is removed before processing. 7.)Extrusion – The plastic is heated and pushed through a nozzle to form a continuous filament. 8.)Cooling & spooling – The filament is cooled, its diameter can be monitored, and it is wound onto a spool. Final product – The recycled filament can be used for suitable 3D-printing applications. Flowchart Text START ↓ Collect Waste Plastic ↓ Initial Sorting ↓ Washing ↓ Plastic Identification (NIR Sensor) ↓ Is Plastic Suitable? NO → Stop System + Buzzer → END YES → Process Suitable Plastic ↓ Shredding ↓ Drying ↓ Heating ↓ Extrusion ↓ Filament Cooling ↓ Spooling ↓ Quality Checking ↓ 3D Printing Filament ↓ END