During operation, water introduced into the spinning centrifuge builds up a wall until the wire is completely submerged. A traversing nozzle then sprays stock against the fabric to build up a fibre layer. When the required amount of stock has been deposited, the white water is removed, thus forming a wet paper web on the wire.

Desired physical, optical and printing properties of test sheets can be obtained by varying the grammage, MD/CD fibre orientation and the distribution of fibre and filler in the Z-direction. Test sheet properties can also be affected by the addition of chemicals to the furnish stream.

Provides the means of making large hand sheets of paper and board, which are then used for research into paper properties, grade development and a comprehensive testing of paper quality. The test results permit optimization of the pulp before it is introduced to the full-size production paper machine.