Fractionation Instrument
Laboratory fractionation devices separate fiber suspensions to analyze the quantity of unpulped flakes and debris in recycled pulp. The haindl screen employs a vibrating slotted plate to isolate non-fibrous elements and poorly disintegrated paper flakes from usable pulp fibers. This equipment evaluates the effectiveness of packaging disintegration and the recyclability of coated boards.
Measuring the dry weight of the retained material allows technicians to classify the repulpability of different stock designs.
Sorting Mechanism
Water-assisted filtration through calibrated slots separates the usable fibers from the rigid reject particles. Within the haindl screen, a water spray wash keeps the pulp suspension moving over a plate containing slots that are usually one hundred and fifty micrometres wide. Usable, flexible fibers easily pass through these slots along with water, while rigid plastic fragments, hot melts, and unpulped paper flakes are held back.
A continuous vibration prevents the slots from blinding, which ensures that the separation is clean and reproducible across trials. The collected reject fraction is dried and analyzed to determine the industrial processing effort required.
Process Evaluation
Recycled paper mills use this laboratory instrument to predict how stock will run in their screening systems. A low reject rate on this screen suggests that the material will process smoothly without causing blockages.
