USTER JOSSI VISION SHIELD removes contamination and minimises wastes for spunlace nonwovens
When textile products are intended for critical end-uses, there can be no compromises on quality. Nonwovens manufacturers, for example, must deliver the highest levels of quality when supplying fabrics for medical, personal care and hygiene applications.So, any contamination in these fabrics is a potentially disastrous quality risk, leading to claims and returned rejects. Zero tolerance levels for defect larger than 1mm are standard. Tiny fragments of foreign matter in the fibre could remain visible as unsightly blemishes, as well as scratching or abrading the user’s skin.
The USTER JOSSI VISION SHIELD fibre cleaning system from Uster Technologies Ltd. (Uster, Switzerland) is reported to be a good solution for this challenge. It provides maximum detection of contaminants with minimal waste. Located in the ideal position, after fine opening in the blowroom, the system uses latest-technology spectroscopes to pinpoint even the smallest particles of foreign matter in the cotton or man-made fibre raw material.
Covering a much wider wavelength than conventional camera systems, USTER JOSSI VISION SHIELD has the power to identify and remove fragments as fine as a single human hair. At this stage in the fibre preparation routine, detection is enhanced, since the fibre tufts have the optimum opening to prevent any small contaminants being hidden inside them.Once identified, the foreign matter pieces are automatically ejected by the system, preventing contamination of the spunlaced fabric. Some waste here is inevitable, but USTER’s innovation controls this by continuously measuring the speed at which the fibre tufts pass through. It then uses precision valves to time each ejection perfectly, so that only the unwanted contaminant is removed, with an absolute minimum of good fibre being lost. The cost savings for the producer can be significant.