The general recycling is the oldest form of recycling. In the plastic industry it started pretty late compared to the much longer existing scrap metal and paper and card board collectors and recyclers. Also the achieved recycling rate at around 25% is much lower than in the 2 longer existing areas. This on the other hand makes the field very interesting as there’s a lot of growth potential especially with raising oil prices. One thing which makes plastic recycling more and more difficult is the vast amount of different plastics and their blend with at least the same amount of possible additives and fillers.
This industry is traditionally divided into to two groups:
Common products to be processed in both fields are usually rejected parts, runners, lumps and purgings. The input materials can be very different in their physical properties as well as in their dimension and shapes. This makes it very important to choose the right machine for each application not just to match the required throughputs but also to be able to handle the parts given.
As the latest way of recycling the post consumer recycling is also one of the fastest growing markets, caused by shortage of resources and soaring energy costs.
On one side new products are made from daily waste we produce, best example here the recycling of PET bottles into yarns and fibres for the textile industry and on the other side refused products with good caloric values are turned into fuels for boilers, cement kilns, power plants and so on.
In the case of turning waste into new raw materials the plastic stream is usually pre-sorted by either the consumer himself, through waste sorting plants or through independent waste collectors as it is often the case in developing countries. As the the source of such materials is usually spread all over a country there are normally lots of small and medium sized collection centres to guide the waste stream into the final processing facilities. To reduce transport cost it arrives there mostly baled or sometimes pre-shred. Only then it is when the final, mostly manual, sorting is done; different kinds and grades of materials, different colours etc. From this point onwards the recycling is then more or less automated and big varieties of input materials as the already mentioned PET-bottles, PE-films and bottles, PVC window frames, PP from toys and household ware, ABS computer and TV housings and lots of more, are turned into re-usable granules, powders, flakes and compounds. Depending on the grade of purity they are turned then into high valuable products like new bottles, yarns or less valuable things like flower pots and garbage bags.
When waste is turned into energy then it is usually not only the plastic fraction but all other things with caloric value as well, wood, biomass, tires etc. In this case the purpose of shredding the input material is to get a homogeneous mix, which is easier to handle, to store and to feed into the next step. For this kind of operation it is necessary that shredding is as efficient as possible so that the energy balance is right and the operation is economical. Because of that a shredder should always run on the biggest screen possible to get maximum output at rated current.
The biggest problem in such an energetic recycling is the high level of contaminants as the boilers usually don’t care about mineral and metallic particle. But for the lifetime of the cutting tools and the wear and tear of the shredder itself a clean as possible input material is necessary.
For both cases Zerma is able to provide just the right equipment to make your operation as profitable as possible. Our shredders are tough built and with a large range of machines and drive options we can achieve output capacities just as you require. And if you wish all in wear resistant executions.