Ethan Clarke
Plastic recycling is a complex process that involves multiple steps and stakeholders. The recycling journey typically begins when consumers toss plastic items into recycling bins, which are then collected by government or private companies from homes, businesses, and recycling centres. The collected plastic waste is then sent to Material Recovery Facilities (MRFs) for sorting and separation into different types of plastic. This step can be done manually or through automated processes, including optical sorting machines, sink-float separators, and magnets. After sorting, the plastic is washed to remove contaminants such as food residue, labels, and adhesives, followed by shredding or melt processing to form pellets or flakes. Finally, the processed plastic is moulded into new products. While plastic recycling faces challenges, such as contamination and the complexity of the recycling process, there is a growing effort by companies, scientists, and organisations to improve recycling rates, develop more sustainable practices, and address the environmental impact of plastic waste.
| Characteristics | Values |
|---|---|
| Collection | Collectors from the government or private companies gather all post-consumer materials from homes, schools, and other institutions. |
| Sorting | Grouping plastics into their respective types, colour, thickness, and usage. Done manually or by machines at recycling plants. |
| Washing | Removing all the impurities that may impede the following processes, including product labels, adhesives, and food residue. |
| Shredding | Breaking down the sorted and washed plastics into smaller-sized pieces. |
| Melting | Melting the different types of plastic and extruding them at a reprocessor. |
| Moulding | Forming the melted plastic into pellets or flakes before moulding them into new products. |
| Symbols | Symbols on plastic packaging can explain which type of plastic they're made of and how to recycle them. |
| Labels | On-pack recycling labels are an easy way to identify items' recyclability. |
| Codes | Numbers surrounded by three interlocking arrows are codes indicating what type of plastic an item is made from. |
| Compostable plastics | Some types of plastic are compostable in a home composter but should not go in dry recycling collection or garden waste bins. |
| Market demand | Boosting market demand for secondary plastics can increase recycling rates. |
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What You'll Learn
Plastic collection and transportation
Collectors from the government or private companies gather plastic waste from homes, businesses, schools, and other institutions. Symbols and labels on plastic packaging can help users identify which type of plastic it is and how to recycle it. For example, some plastics are compostable in a home composter but should not be placed in a dry recycling collection or garden waste bin. Some local authorities offer collection facilities for plastic bottles, and an increasing number collect mixed plastics packaging, such as pots, tubs, and trays. Larger items, such as electrical goods, may be collected by retailers as part of a take-back scheme.
Once collected, plastic waste is sent to Material Recovery Facilities (MRFs), which handle plastic and non-plastic items, or Plastic Recovery Facilities (PRFs), which handle just plastic. Here, the mixed recycling is removed from the collection vehicles and placed on conveyor belts. The plastic is then sorted by type, colour, size, and thickness, either manually or using machines such as optical sorting machines and sink-float separators.
After sorting, the plastic is shredded into smaller pieces and washed to remove any remaining contaminants, such as food waste, labels, adhesives, and residual waste. This stage is important as contamination can disrupt the recycling process, leading to plastics being sent to landfills instead of being recycled.
Finally, the shredded plastic is transported to be reprocessed. Shipping by rail is an environmentally responsible and cost-effective mode of transportation for recycled plastic, offering economies of scale and a lower carbon footprint than road transport.
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Sorting and cleaning
Once the plastic waste has been sorted by type, it undergoes further cleaning to remove any impurities that may hinder the recycling process. This includes washing to eliminate adhesives, residual waste, food waste, and labels. This step is crucial as contaminants can affect the quality of the final recycled product. Therefore, individuals are encouraged to rinse plastic items before placing them in recycling bins to facilitate the cleaning process and prevent contaminants from drying and sticking to the plastic.
The sorting and cleaning processes aim to ensure that the plastic waste is as pure and clean as possible before it undergoes further processing. This stage is essential to prevent recyclable materials from ending up in landfills due to contamination. Contamination can occur when non-recyclable plastics are mixed with recyclable ones or when plastics contain food residue, chemicals, or adhesives. Proper sorting and cleaning enable the creation of higher-quality recycled plastics and contribute to a more sustainable future by reducing waste and reusing materials.
Additionally, the design of plastic packaging plays a significant role in the ease and effectiveness of the sorting and cleaning processes. Companies are encouraged to consider designing packaging for recyclability from the initial stages. Initiatives like the APR Design® Guide provide tools and criteria to help companies create packaging that is more recyclable. By choosing post-consumer resin (PCR) for packaging, companies can reduce virgin plastic production, leading to decreased natural resource extraction and lower energy consumption.
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Shredding or melting
The recycling of plastic is essential to avoid environmental contamination. The first step in the recycling process is the collection of plastic waste from homes, businesses, and recycling centres. The plastic is then sorted into different types and cleaned to remove any contaminants. Once sorted and cleaned, the plastic can be shredded into flakes or melted and processed into pellets before being moulded into new products.
Shredding is the process of breaking down sorted and washed plastics into smaller pieces. This can be done using a variety of equipment, including shredders and mills. The shredded plastic can then be further processed into pellets or flakes, which can be melted and moulded into new products.
Melting is the process of heating the plastic until it becomes a molten liquid. This can be done using a variety of methods, including oven melting and extrusion. The melted plastic is then mixed with other materials, such as asphalt binder, to create new products. The melting point of the plastic will depend on its type, with some plastics having a melting point above 200 °C.
It is important to note that melting plastic can produce toxic fumes that can be harmful if inhaled. Therefore, it is recommended to melt plastic in a well-ventilated area or with an exhaust fan to reduce the risk of inhaling toxic fumes.
Overall, shredding and melting are crucial steps in the plastic recycling process, allowing for the creation of new products from waste materials. These processes help to reduce the environmental impact of plastic waste and contribute to a more sustainable future.
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Moulding into new products
The process of plastic recycling has improved significantly in recent years, with the collection of plastic being key to the system's success. Once collected, the plastic is sorted, shredded, washed, and melted before being moulded into new products.
Moulding is the final stage of the plastic recycling process, where the plastic is given a new form and function. This can be done by injecting, extruding, or compressing the plastic into a mould. Small-scale injection moulding machines are often used by local communities and small businesses to produce new products from shredded plastic waste.
Creating moulds for this process can be difficult and expensive, as they are typically CNC machined from metal blocks. The cost of these moulds can range from £500 to £5000. To make mould-making more accessible, 3D printing can be used to create low-cost and highly accessible injection moulds. These moulds can be made with electroplating to create a metal surface layer, improving the quality of the final product and making it easier to release from the mould.
For those interested in moulding plastic at home, there are a few methods to consider. One way is to use a 3D printer, such as the Filabot, which can recycle plastic objects and create new shapes. Another method is to wash and cut plastic bottles into small chunks, place them in a metal container, and melt them in an oven at 350°F. However, it is important to note that melting plastic produces toxic fumes, so this should only be done in a well-ventilated area or with an exhaust fan. Basic crafts can also be created by heating plastic with a hairdryer and bending it into shape.
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Designing packaging for recyclability
The process of plastic recycling has improved significantly in recent years. However, many people still lack the knowledge to recycle correctly, which can lead to contamination and other issues. To address this problem, companies can play a crucial role by designing their packaging for recyclability, ensuring that it can be easily remanufactured into something useful.
To design packaging that is truly recycling-compatible, companies can refer to guidelines such as the APR Design® Guide, which is widely recognized in North America. This guide provides extensive testing protocols and industry-accepted criteria to assess the recyclability of each individual design feature of a package. By minimizing contamination and improving productivity in the recycling process, companies can also reduce costs and ensure high-quality post-consumer resin (PCR), reducing the need for new plastic.
Curbside recycling is generally preferred over source-separated recycling as it is more accessible to a larger number of households. Additionally, companies should consider the compatibility of different packaging elements, such as caps, labels, and adhesives, with given recycling streams. Symbols on plastic packaging can also help consumers understand what type of plastic it is made of and how to recycle it properly.
By prioritizing designing for recyclability, companies can make a significant positive impact on the environment. This involves not only the design itself but also ensuring consumer access to collection systems and acceptance within those systems. Ultimately, by investing in sustainable packaging solutions, companies can contribute to a cleaner and healthier planet.
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Frequently asked questions
The plastic waste collected from homes, businesses, and recycling centers is sent to Material Recovery Facilities (MRF) to be sorted into different types of plastic. The plastic is then shredded into smaller pieces, washed, and melted down to form pellets before being molded into new products.
Plastic bottles are usually made from two types of plastic that are easy to recycle: PET and HDPE. 99% of UK local authorities offer collection facilities for these plastic bottles, and many now also accept mixed plastics packaging such as pots, tubs, and trays.
Symbols and codes on plastic packaging can indicate the type of plastic and whether it can be recycled. However, it's important to check with your local authority or community recycling guidelines as this can vary depending on your location.
Plastic is not designed to be recycled and becomes more contaminated and less useful with each use. Additionally, the recycling process can be complex and intricate, requiring specialized chemicals and knowledge to sort and process different types of plastic effectively.
