Fluid Alignment
Fibre positioning in wet-laid and scanning systems is controlled by the flow characteristics of the suspending liquid. In modern paper and wet-laid nonwoven manufacturing, hydrodynamic orientation uses fluid acceleration to align loose fibres along the direction of the flow. This controlled alignment prevents the fibres from clumping together before they are deposited on the forming wire.
Nozzle Dynamics
An accelerating nozzle forces the fluid mixture through a narrowing channel to increase its speed. During this transition, hydrodynamic orientation occurs as the front end of each fibre is pulled forward faster. This mechanical action straightens the fibres.
Measurement Accuracy
Monitoring systems use high-speed cameras to verify that the fibres are properly aligned before they reach the web-forming zone. When hydrodynamic orientation is maintained, the scanning software can easily measure the length and width of each individual filament. If the fluid flow becomes turbulent, the fibres twist and overlap, which prevents accurate measurements.
Nonwoven Strength
Web strength in the final product is directly affected by the direction of the constituent fibres. By adjusting the degree of hydrodynamic orientation during the wet-laying phase, manufacturers can create fabrics that are strong in one direction or equally balanced in all directions. This adjustability is critical for producing filters, surgical drapes and specialty wipes that must withstand high bursting pressures without tearing or splitting during heavy industrial use.
