Using PLC(Programmable Logic Controllers) and HMI(Human Machine Interface) to aid in the design of modern PET Plastic Recycling Plant which produces plastic pellets as an end product.

1. PLC/HMI AUTOMATION OF PET PLASTIC RECYCLING PLANT THAT PRODUCES PLASTIC PELLETS
Daboner Alfred, Danso Emmanuel, Ofori Isaac
KWAME NKRUMAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF ELECTRICAL/ELECTRONIC ENGINEERING
Background
3D Model of the Recycling Plant
References
Objectives
Flow Chart
This research was supervised by Mr. E.K. Anto with technical advice from Mr. E.O.K. Addo, all of the
Electrical/Electronic Engineering Department, KNUST
Conclusion
• Prepare a literature review of PLC based
industrial processes
• Prepare literature on design considerations
and on hardware and software requirements
for the use of PLC and HMI for automation
of industrial processes
• Design a PLC/HMI automation system for a
typical PET Plastic recycling plant
Results
1. L.A.Bryan_E.A.Bryan: Programmable Controllers, Theory
and Implementation, 2nd Edition
2. KRONES MetaPure: The Bottle-to-Bottle PET Recycling
Plant, Pure Technology
3. Erwin Normanyo, Afua Pokua & Isaac A. Adetunde:
AUTOMATION OF A PROTOMATIC LABELLER OF A
BREWERY USING SIEMENS SIMATIC STEP 7
CONTROL SOFTWARE: A Case Study Of Accra Brewery
Limited (ABL), Ghana , IJRRAS, (Vol 6, Issue 4, March 2011)
4. T.Kalaiselvi, R.Praveena, Aakanksha.R, and Dhanya.S: PLC
BASED AUTOMATIC BOTTLE FILLING AND
CAPPING SYSTEM WITH USER DEFINED LEVEL
SELECTION, International Journal of Emerging
Technology and Advanced Engineering, Website:
www.ijetae.com , (ISSN 2250-2459, Volume 2, Issue 8,
August 2012)
5. COWI A/S,Trine Lund Neidel and Jens Bjørn Jakobsen:
Report on Initial Assessment of Relevant Recycling
Technologies, Plastic ZERO - Public Private Cooperations
for Avoiding Plastic as a Waste, 2013
• The simulation of the automation process was
carried out using the Siemens Simatic together
with the Step 7 Visuo.
• Functional block diagram was used as
programming language.
Industrial Automation has acquired importance
owing to the ever-increasing demand for more
productivity, and optimum utilization of available
resources and manpower. Due to the increasing
usage of plastics such as PET, its recycling has
become very vital to help reduce waste and protect
the scarce resources used in producing new raw
materials.
The Process consist of three stages,
each having several interrelated processes.
• The design makes use of PLC which is used to
monitor the conditions of the whole process as
well as control the switching of devices.
• The project provides a more efficient, and
productive way of implementing a PET
recycling plant with less human intervention,
less power consumption and easy
troubleshooting.
• The design is very flexible, more functionalities
can be added, and there can be easy alteration of
a process by making changes in the
programming codes.
Removal of
Sandy
Particles (by
Vibrator)
Label
Separation
Manual
Sorting
UV
Separation Electrostatic
Separation
Shredding
Process 1
Air Classifier
Process 1
Shredding
Process 2
Air Classifier
Process 2
Float/Sink
Classifier
Process
Pre-Washing
(Hot
Washer1)
Main
Washing (Hot
Washer 2)
Finish
Washing (Hot
Washer 3)
Magnetic
Separation 1
Air Classifier
Process 3
Shredder
Process 3
Drying
Process (by
Hot air
blower)
Magnetic
Separation 2
Production
(and or
Packaging) of
PET Flakes
Extrusion of
flakes
Production of
PET Pellets
Implementation
STAGE 1: Shredding,
Sorting, Washing
STAGE 2: Air Classifying, Magnetic Separation,
Drying
STAGE 3: Packaging