We’re all familiar with the feeling of grabbing a fresh bottle of milk from the fridge—whether it’s for your morning coffee, cereal, or cooking. But have you ever wondered what happens to that plastic bottle after the milk is gone? Or what its journey was before it even arrived at your local supermarket? The answer to both of these questions is surprisingly connected, thanks to a recycling process known as “closed-loop recycling.”
What is a plastic bottle made of?
Plastic milk bottles are made from HDPE (high-density polyethylene), a strong and lightweight material perfect for carrying liquids such as milk. You can easily identify it by the number “2” inside the recycling triangle symbol. HDPE is commonly used because it’s durable, food-safe, and can withstand the wear and tear of transportation. Its flexibility allows for the inclusion of easy-to-grip handles, making it user-friendly for all ages and abilities.
Manufacturing and filling
The journey of a plastic milk bottle begins at a manufacturing facility. Recycled HDPE, or rHDPE, is mixed with virgin plastic to create new bottles. This blend is heated and shaped into bottles using a process that resembles blowing up a balloon, in which the heated plastic is blown into a mould that instantly cools and sets the shape of the bottle.
Once formed, these bottles are transported to dairies and filled with milk. A single cow can produce up to 30 litres of milk every day, which is enough to fill around 60 one-pint bottles. After filling, the bottles are labelled and sent to supermarkets for purchase and consumption.
What happens after the milk is gone?
Once the milk is finished, it’s time for the recycling process to begin. By properly cleaning out your empty milk bottle, you not only keep your bin smelling fresh but also prevent contamination of other recyclables, such as paper or cardboard. Contrary to popular belief, there’s no need to remove the cap or label—these will be handled during the recycling process.
From kerbside to a recycling facility
After you place your empty bottle in the recycling bin, waste collection vehicles take it to a Materials Recycling Facility (MRF). Here, the bottles are sorted, and prepared for recycling. Any non-recyclable materials are filtered out, and the plastic is baled for onward recycling.
The baled plastic then heads to a polymer re-processor and is cleaned and shredded into small pellets, which can then be used to create new bottles. This closed-loop process means that the milk bottle you recycle today could very well be part of the next bottle you buy.
Closed-loop recycling is key to reducing the environmental impact of plastic waste. Instead of ending up in landfills or oceans, your recycled milk bottle is repurposed into new, usable products, reducing the need for virgin plastic production and conserving natural resources.
Try Coastal Recycling
At Coastal Recycling, we support sustainable practices like closed-loop recycling to help create a cleaner, greener future. Next time you finish a bottle of milk, remember that its journey doesn’t end at your recycling bin—it’s just beginning! By recycling, you’re not only helping the environment but also contributing to the creation of new products. Together, we can make a difference. Contact us today.
Plastic milk bottles are made from HDPE (high-density polyethylene).