A further advantage of the hydrocyclone separation step is the high amount of water present in the water circuit, ensuring together with the revolving forces arising due to the hydrocyclone, a very good washing result of the films.
Deposits of organic substances, a frequent feature of film from household waste, are easily removed by washing. In contrast, films from supermarkets often have a high percentage of paper in the form of affixed labels. It is a real challenge to separate this paper from the film since these LLDPE films from supermarkets are ideal as feeding material for recyclate used for the production of new film.
The most important question is the one concerning the required quality of the end product. From this question the necessary recycling steps will depend. Economically speaking, only certain wastes can be used for recycling.
Operators increasingly turn to materials that are available on the market for a very reasonable price. That is one of the reasons why plant manufacturer and operator should work hand in hand. The more precise the specification of the input material is, the more cost-efficient the design of the plant can be since unnecessary process steps or room for misinterpretation can be avoided.
The operator of a washing plant will also have to find a solution for the collection of film waste. An existing collection and separation system is the ideal starting point. Without such a system, a recycler of plastics waste can only use material flows that have been imported from countries where these materials are collected and recycled accordingly.
Obviously, it is also possible to collect mixed post-consumer waste and to separate preliminarily as much organic matter as possible in order to obtain a plastic fraction.