Raw material: The basic raw material of
Ultrasonic treatment: The fibrous raw material is being exposed to an ultrasonic field in a watery medium for a time period between 10 and 120, usually 30 seconds. During this continuous procedure and subsequent washing the fibrous is being cleaned and extensively freed of attendants like dust, soluble organic components, micro organisms, colour and scent stuffs. The level of cleaning can be determined by adjusting the process-parameters.
Post-processing: As a rule immediately after treatment the fibre is being dried, opened and cleaned again. Shives and other coarse materials still attached as well as short fibres are being removed. The waste mixture mainly made of short fibres and shives can be regarded as a by-product.
Refinement: Following refining and finishing procedures are applicable on the cleaned ultrasound fibre material: cutting, grinding, fibrillating, and coating, which are being used alternatively or in a row. Cutting and grinding will shorten the fibres, fibrillation will amplify the specific surface. Coating can be useful to improve the binding attitudes of a fibre within a matrix (for example plastics). Additional possible refinement steps are bleaching, dyeing and mixing.