Maya Ellison
Plastic waste has become a significant environmental concern, with its detrimental effects on ecosystems and human health. The recycling process involves a series of stages, including collecting, sorting, shredding, melting, manufacturing, and end-of-life processes. This complex, reverse supply chain begins with users depositing plastic into recycling containers, either at home or in public places. Collection is essential, as it provides the raw material for the entire process. The plastic is then sorted by type, either manually or through techniques like magnetic separation, and sent to Material Recovery Facilities (MRF) and/or Plastic Recovery Facilities (PRF) for further processing. After sorting, the plastic is shredded, washed, and melted into new pellets, which are then used to create a variety of new products. These recycled products contribute to a circular economy, reducing the need for virgin plastic production. Finally, when these recycled products reach the end of their life cycle, they can be further recycled, composted, or undergo energy recovery through incineration.
| Characteristics | Values |
|---|---|
| First Step | Collection of plastic waste from homes, businesses, schools, recycling centres, and drop-off centres |
| Second Step | Sorting plastic from other materials at Material Recovery Facilities (MRF) and further sorting into different types of plastic at Plastic Recovery Facilities (PRF) |
| Third Step | Shredding or cutting plastic into smaller pieces or flakes |
| Fourth Step | Washing plastic flakes in hot water and detergent to remove dirt and adhesives |
| Fifth Step | Separating different types of plastic based on density by floating them in water |
| Sixth Step | Air classification test to identify the thickness of plastic |
| Seventh Step | Melting and extruding plastic into new pellets or moulding into new products |
| Eighth Step | Using recycled plastic pellets in manufacturing new products |
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What You'll Learn
Collection and separation from other materials
The first step in plastic recycling involves collecting discarded plastic materials from homes, businesses, schools, and recycling centres. This is typically done through curbside collection, drop-off centres, or specialised recycling programs. Plastic recyclers place recycling containers in public places, especially in commercial and industrial districts. The collected plastic is then bulked together and transported to recycling facilities.
At the recycling facilities, the process of separating plastic from other materials begins. This is done at Material Recovery Facilities (MRFs), which handle plastic and non-plastic waste, and/or Plastic Recovery Facilities (PRFs), which handle just plastic. The mixed recycling is removed from collection vehicles and mechanically placed on conveyor belts to maintain a constant flow of waste through the facility.
A variety of techniques are used to separate the materials, including manual picking, ballistic separation, and magnetic separation. During manual picking, large items, non-recyclables, and obvious contaminants are removed and sent for further processing or disposal. A ballistic separator, for instance, separates rigid items (such as bottles, containers, or cans) from flexible items (such as paper, card, newspapers, and plastic wrapping). A magnet separator is used to remove any metals present.
After non-recyclables and other materials have been removed, the plastic waste is then sorted into different types of plastic. Sorting is usually done by machine to increase efficiency, but in smaller communities, it may be done manually by volunteers. The plastics are sorted based on various characteristics, such as density, colour, thickness, melting point, and composition. For instance, recyclers may float plastic particles in a basin of water to separate denser plastics from less dense ones. An air classification test is also used to identify the thickness of the plastic by putting small pieces into a wind tunnel. Sorting is vital as different types of plastics require different recycling methods.
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Sorting into different types of plastic
Sorting plastic waste into different types is a critical step in the recycling process. Different types of plastics require different recycling methods, so effective sorting ensures that the correct processes are applied to each type of plastic. Sorting is usually done at Material Recovery Facilities (MRF) or Plastic Recovery Facilities (PRF). MRFs handle plastic and non-plastic materials, while PRFs only handle plastics.
There are several techniques used to sort plastic, including manual picking, ballistic separation, and magnetic separation. Manual picking involves sorting by hand, where large items, non-recyclables, and contaminants are removed. Ballistic separators, on the other hand, use oscillating paddles to separate rigid and flexible items. Rigid items like bottles, containers, or cans are moved to one end, while flexible items like paper, card, or plastic wrapping are moved to the other end. Magnetic separation is used to remove metals from the waste stream.
After the initial sorting and separation from non-plastic materials, the plastics are further sorted into different types. This can be done through density separation, where plastics are floated in a basin of water, with denser plastics sinking and less dense plastics floating. An air classification test may also be performed to identify the thickness of the plastic. Small pieces of plastic are placed in a wind tunnel, with thicker pieces flying higher and bigger particles remaining lower. Sorting equipment, such as sink/float separators, can also be used to separate plastics based on their composition, such as PET (polyethylene terephthalate), HDPE (high-density polyethylene), and PVC (polyvinyl chloride).
The sorted plastics are then processed further, which may include shredding, melting, and extruding the plastic into pellets, which can then be used to create new products. These pellets are sold to manufacturers who incorporate them into various items, such as packaging materials, containers, furniture, and textiles.
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Shredding into smaller pieces
Shredding is a critical stage in the plastic recycling process. After plastic waste has been collected from homes, businesses, and recycling centres, it is sent to Material Recovery Facilities (MRF) and/or Plastic Recovery Facilities (PRF) to be sorted. Once sorted, the plastic is then shredded into smaller pieces.
The sorted plastic is sent through shredding machines, where it is ground into smaller pieces, also known as flakes. This process can be done in a variety of ways, depending on the type of shredder. For example, Hammer Mills pulverize plastics in a rotary drum using swivelling hammers, while Shear Shredders use rotary cutters and guillotines to cut plastics to industry size requirements.
The shredding process is important because it prepares the plastic for the next stage of processing. After being shredded, the plastic is washed in hot water and detergent to remove surface dirt and dissolve any adhesives or labels. This step ensures that the plastic is clean and free of contaminants before it is processed further.
Additionally, shredding plastic into smaller pieces makes it easier to sort and separate the different types of plastic. This can be done manually or through mechanical means, such as using a sink/float separator or a ballistic separator. The size of the plastic pieces also makes it easier to transport and process the material, as it can be easily conveyed through the various stages of the recycling process.
Overall, shredding plastic into smaller pieces is a crucial step in the recycling process as it facilitates the cleaning, sorting, and transportation of the material, bringing us one step closer to giving plastic a new life.
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Melting and moulding into new products
Once the plastic has been collected and sorted, it is shredded into small flakes. It is then washed in hot water and detergent to remove dirt and any adhesives used to attach labels. The flakes are then melted and processed into pellets. These pellets are then moulded into new products.
The melting process involves placing the plastic flakes into a large tank of water, where different types of plastic are separated based on density. Less dense particles float, while more dense ones sink. This process helps identify the different types of plastic, as they have distinct densities. For example, caps of a soda bottle, often made of HDPE plastic, float to the top, while the bottle, made of PET, sinks to the bottom.
After the identification process, the plastic is ready for further processing. It is transformed into usable products through compounding, which is the final step in the plastic recycling process. Compounding involves melting and moulding the shredded or resized plastics into usable products for manufacturers.
The recycled plastic pellets are then incorporated into various new products, such as packaging materials, containers, furniture, and textiles. By using recycled plastic, companies can reduce their dependence on virgin plastic and contribute to a circular economy. It is important to promote the use of recycled plastic products to create market demand and encourage the adoption of sustainable practices.
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End-of-life processes, including further recycling
End-of-life processes are an important part of the plastic recycling journey. These processes ensure that recycled plastic waste is not wasted but is utilised in the most environmentally friendly manner. Eventually, recycled plastic products reach the end of their life cycle. At this stage, various end-of-life options exist, including further recycling, composting, or energy recovery through incineration.
The first step in the recycling process is collecting the plastic material that is to be recycled. This step is entirely reliant on businesses, restaurants, and the public to dispose of their plastic waste in the correct place. Local collection points for plastic should be easily accessible to the public. Making it convenient for people to correctly dispose of plastic waste is paramount in promoting recycling.
Once collected, the plastic waste undergoes a sorting process. Sorting is vital as it identifies the waste materials and the correct processes to recycle the different types of plastics. Sorting can be done manually or with advanced sorting machines that use infrared, x-ray, or other cutting-edge sensors to recognise a polymer's unique signature and, in some cases, colour. After sorting, the plastic is washed to remove any labels, adhesives, or food residue. This step ensures that impurities and non-plastic waste are removed, as these can affect the quality of the final recycled product.
Next, the plastic is resized or shredded into smaller particles or flakes. This step increases the surface area of the plastic, making it easier to process, reshape, and transport. The plastic particles are then tested to determine their quality and class, with high-density plastics sinking and low-density plastics floating in a large tank of water.
After testing, the plastic is dried, melted, and formed into pellets, which can be used for manufacturing new products. These recycled plastic pellets can be sold to companies to create various products, including artificial fleece, engineered wood products, and furniture.
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Frequently asked questions
The first step in recycling plastic is collection. Plastic is deposited by users into a recycling container, which can be placed in public spaces, at the curbside, in drop-off centres, or as part of a specialised recycling program.
The second step is sorting. The plastic is sorted from other materials and then sorted again into different types of plastic. Sorting is usually done by machine, but in smaller communities, it may be done by hand.
The third step is reprocessing. The plastic is washed, shredded into flakes, melted, and extruded into new pellets.
The fourth step is compounding, which involves transforming the recycled plastic into usable products. The recycled plastic pellets are used in the production of new plastic products, such as packaging materials, containers, furniture, and textiles.
