Omar Khalid
Plastic is one of the most popular and useful materials of modern times, and recycling is the best way to reduce the amount of plastic in our environment. The plastic recycling process involves the sorting and shredding of photochemical materials to create useful and functional products. The process of recycling plastic begins with collection, where the more plastic collected, the more material there will be for the recycling process. The plastic is then sorted by type, colour, or how it was made, and washed to remove impurities. The sorted and cleaned plastic is then shredded into flakes or melt-processed to form pellets before being moulded into new products.
| Characteristics | Values |
|---|---|
| Purpose | To protect the environment and reduce waste, dependence on landfills, and natural resource extraction |
| Plastic types | PET, HDPE, PP, PVC, PS |
| Plastic uses | Containers, bottles, caps, bags, pipes, flooring, signage, furniture, surgical tools, clothing |
| Recycling process | Sorting, washing, shredding/grinding, melting/reforming, decontamination, filtration |
| Sorting methods | Manual, optical sorting machines, sink-float separators, magnets, NIR sensors |
| Washing methods | Friction washers, rotary washers, hot water and detergent |
| Shredding/grinding | Hammer Mills, pulverization |
| Melting/reforming temperature | 150–320 °C (300–610 °F) |
| Recycling rate | 9% of plastic waste has been recycled, 1% more than once |
| Recycling challenges | Contamination, cost, technical barriers, environmental dumping, microplastic release |
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What You'll Learn
- Sorting plastics by type, colour, thickness, and usage
- Washing to remove impurities like labels, adhesives, and food residue
- Shredding or grinding to break down plastics into smaller pieces
- Melting and reforming plastic into new items
- Reducing landfill waste, conserving resources, and protecting the environment
Sorting plastics by type, colour, thickness, and usage
Sorting plastic is the first step in the recycling process. Sorting entails grouping plastics into their respective types, colours, thickness, and usage. Sorting can be done manually or by machines at recycling plants.
Infrared technology is used to separate the different types of plastic from each other. Sorting by type is important for ensuring the quality and safety of the new recycled plastic. For example, shampoo bottles should not be mixed with drink cartons. Optical detection systems allow colours to be separated. Sorting by colour is important for maintaining the quality of the final product. For instance, consumers prefer pearly white packaging, but this can be changed to murkier colours like greys, greens, and browns.
Light plastics like polyethylene (PE) and polypropylene (PP) films are filtered off in an airstream, while heavier and rigid plastics continue in a 3D stream. Sorting by thickness is done by segregating plastics based on density, with testing done by floatation on water. Sorting by usage refers to the different applications of the plastic, such as shampoo bottles or drink cartons.
After sorting, the plastics are washed to remove impurities like glues, inks, and food scraps. They are then shredded into small flakes, which might be further sorted by colour. The pure plastic is then ready to be processed into new products.
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Washing to remove impurities like labels, adhesives, and food residue
The process of recycling plastic involves several steps, one of which is washing the plastic to eliminate impurities. This step is crucial to ensure the final product is of good quality. The washing process helps remove various impurities, including product labels, adhesives used to attach labels, and food residue or waste.
Washing is an essential step in plastic recycling, as it ensures that the material is thoroughly cleaned before further processing. This step not only removes visible contaminants but also helps dissolve adhesives and oils and remove any residual waste left in containers. The washing process can vary depending on the level of contamination and the specific requirements of the recycling facility. One common method is the use of friction washers, which are popular due to their low operational cost and effectiveness. These washers employ heat, kinetic energy, and pressure to effectively clean the plastic of impurities.
Another type of washer used in the process is the rotary washer. Rotary washers utilize a heated caustic solution to address more challenging contaminants, such as oils and food residue. The use of heat and detergents ensures that any stubborn residues are dissolved or loosened, making it easier to achieve a thorough clean. This step is especially important for plastics intended for food-contact packaging, as they must undergo a rigorous decontamination process to meet food safety standards.
The washing process also helps prepare the plastic for the next steps in the recycling journey. After washing, the plastic is typically shredded or ground into smaller flakes, which can then be processed further. This step, known as shredding, is crucial in breaking down the plastic into a usable form for creating new products. The washing process, therefore, plays a pivotal role in ensuring the recycled plastic is free from impurities and ready for the subsequent stages of the recycling process.
It is worth noting that individuals play a significant role in this process. By simply rinsing plastic containers before placing them in the recycling bin, people can help remove food residue and other impurities. This small action can make a big difference in the overall quality of the recycled material and ensure that the plastic is properly prepared for the recycling process.
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Shredding or grinding to break down plastics into smaller pieces
Shredding or grinding plastic into smaller pieces is a critical stage in recycling plastic. This process involves breaking down sorted and washed plastics into smaller-sized pieces, which can then be used as additives within asphalt or sold as a raw material. Shredding also allows for the removal of impurities such as metals, food residue, labels, adhesives, and dirt. It is worth noting that shredded plastic can be sold to manufacturers to be melted and reused in many products, such as new plastic bottles or other suitable items.
The shredding process can vary depending on the type of plastic and the equipment used. For example, Hammer Mills are used to pulverize plastics in a rotary drum using swivelling hammers. On the other hand, Shear Shredders employ rotary cutters and guillotines to cut plastics to industry size requirements. The size of the shredded plastic is determined by the screen size used, typically ranging from 40 to 80 mm for hard plastics.
The complex process of shredding rigid plastics involves specialised equipment such as the WEIMA single-shaft shredder. This machine can handle large volumes of plastic waste, ensuring efficient and uniform shredding. The shredded plastic is then transported to the next stage of processing, typically washing, drying, or extrusion.
Overall, shredding or grinding plays a vital role in the recycling process by reducing plastic waste into smaller pieces that can be further processed and reused in various applications. This step is essential for maintaining the quality of recycled plastic and ensuring the removal of any remaining impurities.
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Melting and reforming plastic into new items
Plastic recycling is the process of converting plastic waste into other products. Recycling can help reduce the need for landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions. The majority of plastic waste is made of thermosoftening polymers, which can be re-melted and reformed into new items through mechanical recycling.
To melt plastic at home, one can use direct heat or chemicals. When using an oven, it is crucial to place the plastic in a heat-proof container to avoid spillage. Preheating the oven to around 300°F (149°C) is recommended, and it is important to monitor the plastic as it melts to prevent burning. Once melted, the plastic should be removed from the oven before it smokes or burns.
The melted plastic can then be poured into a mould to create a desired shape. Pre-made heat-resistant moulds are available, or one can create a custom mould from materials like wood. If a specific shape is desired, it is advisable to make a custom mould. Additionally, the cooled and hardened plastic can be cut and sanded to achieve the desired shape.
It is important to determine if the plastic can be safely melted by considering its number or characteristics. Some plastics, such as ABS plastic and Styrofoam, can be effectively melted using acetone, a solvent found in hardware and beauty supply stores. However, caution must be exercised when handling acetone due to its skin and eye irritation potential, as well as its extreme flammability.
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Reducing landfill waste, conserving resources, and protecting the environment
Plastic is one of the most popular and useful materials of modern times, with over 9200 million metric tonnes produced to date. However, only a small fraction of this is recycled, with the rest ending up in landfills, incinerated, or littered. Recycling plastic is essential for reducing landfill waste, conserving resources, and protecting the environment.
Reducing landfill waste
Landfills are highly engineered systems where waste is deposited, compressed, and covered with dirt to prevent odours and wind-swept litter. Plastics that end up in landfills do not decompose like food or paper but remain for hundreds or even thousands of years, contributing no economic or environmental benefit. Instead, they retain their embedded energy and can leach toxic chemicals into the surrounding environment, posing risks to both ecological and human health.
Conserving resources
Recycling plastic can help conserve resources by reducing the need to create new plastic. Plastic is derived from fossil fuels, and recycling can decrease the demand for these finite natural resources. Additionally, recycling can help curb plastic leakage into the environment, reducing the impact of plastic pollution on the ecosystem.
Protecting the environment
Recycling plastic is crucial for protecting the environment due to the adverse effects of plastic waste on ecological and human health. Plastic waste can accumulate in landfills or disperse within the environment, leading to toxic chemical releases and adverse health impacts. By recycling plastic, we can reduce the amount of plastic waste that ends up in nature, minimising the potential harm it can cause.
While recycling is an essential solution, it is not the only answer to the plastic waste problem. It is also important to focus on sustainability and end-of-life considerations when designing plastic products. Refusing single-use plastics and opting for reusable alternatives can significantly reduce the amount of plastic waste generated, lessening the burden on recycling systems.
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Frequently asked questions
Collection is the first step in the plastic recycling process. The more plastic is collected, the more material there will be for recycling.
The collected plastic is then taken to a recycling facility for sorting. The machines sort the plastic into different areas depending on its properties and what final product is being produced. Sorting is important because each type of plastic has to be processed differently.
Optical sorting machines use infrared measurements to identify plastic types. Optical machines feature sensors that measure the absorbencies of plastic.
The sorted plastic is then washed to remove impurities, such as labels and adhesives. This enhances the quality of the finished product.
The plastic is then shredded into small pellets, thus increasing its surface area. The small plastic particles are then tested to determine their quality and class.
