According to Petcore Europe, Polyethylene Terephthalate (PET) was first developed for use in synthetic fibres by British Calico Printers in 1941. Although it was originally produced for this purpose, it was soon after that, in the mid-1960s, that it began to be used for packaging film, after which, in the early 1970s, the biaxially oriented blow-moulding technique for bottles was marketed. One of the main characteristics of this material is its environmental aspect, as it is fully recyclable. It was in 1977 when the first PET bottle was recycled and turned into a glass. Today, the fibre market is still the main consumer of rPET. But what are the different processes this material must go through before being recycled for a new use?
Collection systems
The European Union (EU) directive on packaging and waste (2004/12/EC) stipulates that Member States must set up collection systems to recover used packaging. However, it is up to each Member State to decide the most appropriate collection method. The following collection systems for post-consumer waste are present in different countries:
Classification of plastics
The plastics collected are first sorted by material (PET, HDPE, etc.), then packaged to reduce the volume and ensure the profitability of the transport, and finally, sold to the reclaimers. After sorting, they are compacted into bales.
To ensure the treatment of plastic waste and its recycling, the EU has established a code (Resin Identification Code or RIC, integrated within the European Waste Catalogue) which, by means of a numerical sequence from 1 to 7 and a series of acronyms, identifies the waste according to the type of plastic polymer it is made of:
The waste collected through the deposit system is sorted by the retailers. If it is done through the street collection systems, it is taken to local sorting centres. In both cases, this can be done manually or using machines manufactured for this purpose. Petcore mentions that an investigation carried out by the US Environmental Protection Agency reveals that automated systems result in a reduction of costs of approximately a 25%.
Mechanical recycling
There are two main types of PET recycling: mechanical and chemical. The most widely used is the mechanical recycling, which consists of obtaining clean PET flakes that are used directly or mixed with virgin polymer in the subsequent transformation process to obtain other end products. The degree of purity of the recovered material is truly relevant in this process.
This system is currently used in Spain to recover PET. With this process, flakes of an optimum quality are obtained to manufacture sheets, fibres, or strips with the distribution of rPET on the market for each of these categories being a 65%, 30% and 3% respectively.
Chemical recycling
Chemical recycling is another process used to recover post-consumer waste. It consists of depolymerizing PET using chemical agents, which could release toxic substances and harm the environment. There are different processes that are determined based on the quality of the material to be treated and the demand for intermediate products. These are:
Advantages of the recycling of plastics
Recycling plastic materials has more advantages than disadvantages and that is where the trend is heading. Amongst others, the main benefits are:
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