Ethan Clarke
Plastic recycling is the process of converting plastic waste into new products. Recycling plastic can help to reduce the need for landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions. However, it is important to note that not all plastics are recyclable, and the recycling process can be complex and costly. Plastic waste is collected from various sources, such as households, businesses, and recycling centres, and sent to Material Recovery Facilities (MRFs) or Plastic Recovery Facilities (PRFs) for sorting and processing. The plastic is then shredded, washed, and melted before being moulded into new products. While recycling is an important part of reducing plastic waste, it is also crucial to focus on prevention, choosing reusable and refillable options, and reducing overall plastic consumption.
| Characteristics | Values |
|---|---|
| Plastic recycling rate | 9% of all plastic waste has been recycled, and only ~1% has been recycled more than once |
| Plastic waste management | Plastic waste is collected from homes, businesses, and recycling centres, then sent to Material Recovery Facilities (MRFs) or Plastic Recovery Facilities (PRFs) |
| Sorting | Sorting is done automatically with manual support to ensure all contaminants have been removed |
| Cleaning | Washing helps remove adhesives, residual waste, food waste, and labels |
| Shredding | Plastic is shredded into smaller pieces or flakes |
| Melting | The shredded plastic is then melted and extruded |
| Moulding | The melted plastic is moulded into new products |
| Symbols | Symbols on plastic packaging indicate the type of plastic and how to recycle it |
| Numbers | Numbers on plastic packaging indicate the type of plastic, with some numbers corresponding to types that are more likely to be recycled |
| Resin Identification Codes (RICs) | RICs are used to identify the type of polymer a plastic product is made from; they are especially important for separating plastic waste in some countries |
| Environmental impact | Recycling plastic can reduce dependence on landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions |
| Challenges | Low demand due to poor/inconsistent properties of recycled plastic, lack of infrastructure, and competition from the oil industry |
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What You'll Learn
Plastic waste collection
Firstly, it is essential to establish efficient waste management systems, especially in areas vulnerable to plastic pollution. This includes providing accessible collection services and infrastructure, such as collection hubs, waste banks, or Material Recovery Facilities (MRFs). These facilities play a vital role in sorting and treating waste before it enters the recycling process.
The success of plastic waste collection relies on the active participation of communities. Households and industries can contribute by separating plastics from other waste before collection, a practice known as source separation. This reduces the complexity of sorting at treatment centres and improves the overall efficiency of the recycling process.
Curbside collection is a common method, where waste is collected directly from the curb in front of residences. This approach is convenient for residents and helps streamline the collection process. Drop-off locations are also available in some areas, where individuals can bring their sorted plastic waste for recycling.
In addition to residential waste, plastic waste collection efforts target post-consumer plastic packaging waste (PPW) from industries. This includes packaging materials such as bags, containers, and plastic film, which are significant contributors to plastic pollution. By collaborating with industries and providing tailored plastic recovery plans, collection organizations can make a significant impact on reducing plastic waste.
Furthermore, it is important to address the challenges faced by lower-income countries and countries with transitioning economies, where waste collection and transportation can account for a large proportion of total disposal costs. Financial constraints and inadequate waste management systems in these regions often result in uncollected waste, leading to environmental and health hazards. Investing in proper waste management programmes and providing financial support can help overcome these challenges.
Lastly, it is worth noting that plastic waste collection is just the first step in the recycling process. After collection, the plastic waste undergoes sorting, cleaning, and further treatment to prepare it for recycling into new products.
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Sorting and cleaning
Sorting plastic waste begins at the household level, where individuals separate plastic waste from regular waste, often using plastic bags. These bags are then collected and transported to sorting installations. At the sorting installations, the bags are torn open, and an extensive sorting process begins. Sorting can be done manually or through automation using infrared technology to differentiate between plastic types. Optical detection systems are also used to separate colours. It is important to separate different types of plastics to ensure that, for example, shampoo bottles are not mixed with drink cartons. Metals are also removed from the plastic during this process.
After sorting, the plastic waste undergoes an extensive washing process to remove any remaining impurities, such as labels, glue, dirt, and food scraps. This step ensures that the plastic is thoroughly cleaned before further processing.
The cleaned and sorted plastic is then often shredded into flakes or ground into finer flakes, which can be further sorted by colour. These plastic flakes are then ready to be processed into new products or recycled into plastic granules.
The entire recycling process requires continuous monitoring and quality inspections to ensure the quality and safety of the final recycled plastic product. Samples of the sorted plastic are regularly tested for homogeneity and quality, allowing for the detection and correction of any deviations, such as colour inconsistencies.
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Shredding and melting
Plastic is one of the most used materials in the world, and it takes hundreds of years to decompose. As a result, recycling is essential to avoid environmental contamination. The recycling process for plastic typically involves shredding and melting.
Shredding is the first step in the sustainable processing of rigid plastics. This process can be done with a plastic crusher or a machine like the WEIMA shredder, which can handle large, voluminous plastic residues that are not recyclable at the curbside, such as plastic toys, sandboxes, kiddie pools, canisters, bowls, and laundry tubs. The plastic is shredded to a homogeneous particle size, producing high-quality recyclate, which is the basis for all products made from recycled plastics.
Another method of shredding is to grind the plastic into small pieces or powder, which can then be processed and mixed with asphalt binder. This method is suitable for plastic wastes with low melting points, such as PS, PP, and LDPE. The plastic waste is ground and then mixed with the asphalt binder at rates of 6-10% (wt.). The addition of plastic increases the melting point of the asphalt binder, resulting in pavement that retains flexibility during winter and has a prolonged service life.
Melting is another critical step in plastic recycling. Most plastic waste is made of thermosoftening polymers, which can be remelted. The melting point of PET and PVC plastics is above 200 °C, so they are unsuitable for asphalt modification by wet process technology. However, other materials can be added to PVC to improve its dispersion in asphalt. Melting is usually done at temperatures of 45.5 °C, but when plastic is mixed, it remains stable even at 55 °C. The melted plastic is then mixed with asphalt binder in a particular ratio.
Overall, shredding and melting are essential steps in the plastic recycling process, allowing for the production of high-quality recyclate and the creation of new products from recycled plastics.
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Moulding into new products
Injection moulding is a popular manufacturing process used to produce a wide range of products, from small medical devices to large car parts. It involves injecting molten plastic into premade moulds to form a finished plastic item. The process can be used with recycled plastics, reducing the environmental impact of manufacturing by minimising waste and decreasing the demand for virgin plastic materials.
The two most common forms of recycled plastics used in injection moulding are plastic pellets and plastic regrinds. Plastic pellets are produced by specialised recycling machines that melt and reshape the plastic into uniform sizes and shapes. This uniformity makes plastic pellets superior to plastic regrinds, which come in various shapes and sizes and can cause problems in the injection moulding process. Recycled plastic pellets also have better melting and mixing features than regrinds, improving the final product quality and decreasing the defect rate.
Using recycled plastic pellets for injection moulding offers several benefits to businesses and the environment. It helps reduce waste, conserve resources, save material costs, and improve sustainability. By reusing plastic, businesses can minimise their greenhouse gas emissions and reduce their carbon footprint, contributing to the fight against climate change. Additionally, recycling plastic during the manufacturing process eliminates waste that would otherwise end up in landfills and oceans, further reducing environmental pollution.
When designing products with recycled plastic injection moulding, there are a few considerations to keep in mind. Firstly, it can be challenging to obtain 100% recycled plastics in bright, vibrant colours due to the risk of contamination. Designing products without a specific colourway restriction can provide more options for using recycled materials. Secondly, recycled plastic is more brittle than virgin plastic, so products requiring structural integrity need to be designed with this in mind. By incorporating features like ribs, it is possible to design strong products using 100% recycled materials.
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Reducing plastic consumption
Recycling plastic is a complex process that involves sorting, cleaning, and melting down plastic waste to create new products. While recycling is an important part of reducing plastic waste, it is just one piece of the puzzle. To truly make a significant impact on plastic pollution, it is essential to focus on reducing plastic consumption in the first place.
- Reusable Water Bottles and Coffee Cups: Single-use plastic water bottles and coffee cups are a huge source of plastic waste. Invest in a durable, reusable water bottle made from stainless steel or glass. For coffee lovers, carry a reusable coffee mug with you. Many coffee shops even offer a small discount if you bring your own mug!
- Plastic Bags: Decline plastic bags whenever possible. Get into the habit of keeping a foldable, reusable shopping bag with you whenever you go out. These bags are often made from recycled materials and can be used thousands of times. If you forget your reusable bag, some stores offer paper bags, which are more easily recyclable, or you can ask for a cardboard box, which is reusable and recyclable.
- Food Storage: Instead of using plastic wrap or zip-lock bags, opt for reusable containers made from glass or metal. Beeswax wraps are also a great eco-friendly alternative for wrapping food items and can be easily cleaned and reused. Silicone bags are another good option, as they are durable and can be used in the freezer, oven, and microwave.
- Personal Care Products: Many personal care products, such as toothbrushes, razors, and shampoo bottles, are made from plastic. Look for alternatives with bamboo handles or metal razors that use replaceable blades. You can also find shampoo and conditioner bars that come without plastic packaging, and some stores even offer refill stations where you can refill your own containers with soap, shampoo, and other liquid products.
- Clothing: Plastic is often used in synthetic fabrics, and these microplastics can end up in our oceans when we wash our clothes. Choose natural fibers like cotton, linen, or wool, and be mindful of the environmental impact of the fashion industry by buying second-hand clothes or supporting sustainable fashion brands.
By following these instructions and being mindful of your plastic consumption habits, you can significantly reduce your plastic footprint and contribute to a healthier planet. Remember, refusing and reducing plastic use is the first and most important step, followed by reusing, recycling, and only as a last resort, disposing of plastic responsibly.
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Frequently asked questions
Plastic bottles can be recycled at your local Recycling Centre or through household recycling collections. Some local authorities also collect mixed plastics packaging such as pots, tubs, and trays.
The plastic is sent to a Material Recovery Facility (MRF) or a Plastic Recovery Facility (PRF). The plastic is then sorted, washed, shredded, and sorted again before being melted and moulded into new products.
The most common types of plastic are LDPE, used for bags, containers, and food packaging film, HDPE, used for milk and shampoo bottles, and PET, used for water and drinks bottles.
Plastic recycling can help reduce dependence on landfills, conserve resources, and protect the environment from plastic pollution and greenhouse gas emissions. However, it is important to note that not all plastics are recyclable, and some may only be downcycled, resulting in lower-quality plastic products.
You can increase your plastic recycling rate by ensuring that your plastic waste is properly cleaned and sorted before collection. Additionally, you can advocate for better recycling infrastructure and support businesses that use refillable and reusable packaging.
