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Further cleaning and refining
The quality of the fibres coming from the previous separation step is already suitable for paper making. However, further cleaning is needed if the fibres are intended for composites and textiles. To this end, several additional refining and cleaning steps are available (Figure below). Depending on the settings of the processing line and the input quality of the straw, different output quality can be obtained. The finest and longest fibres are suitable for textiles. Within the range of fibres suitable for textiles, there are again different qualities (Chapter 7).
For textile applications, the fibres go through a scanner which – based on colour – detects and removes undesired parts such as knots from twines which were used for baling.
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