Yarn spinners already understand the importance of preventing contamination in their products. A total of 3,500 world- wide installations of Jossi fiber cleaning systems – now produced by USTER – is proof of that.
The USTER® JOSSI VISION SHIELD solutions are highly effective at removing even the smallest contaminants, including polypropy- lene. For nonwovens producers, however, the risk of contamina- tion is possibly even greater: in medical and hygiene applications, for example, quality standards are super-critical and zero contami- nation is essential. Contaminated yarn is one of the spinner’s biggest headaches, potentially leading to customer claims and rejects when synthetic particles such
as polypropylene (PP) remain undetected in cotton until the fabric reaches the dyehouse. Today, the range of USTER® JOSSI systems is proven to deal with this problem with unbeatable effectiveness, detecting and removing foreign matter from cotton at the spinning preparation stage.
Uster Technologies acquired Jossi AG in 2013 and now applies the USTER® JOSSI VISION SHIELD 2 and USTER® JOSSI VISION SHIELD T systems, using multiple detection principles to eject all polypropylene particles, however minute. The finest white PP contamination is reliably and efficiently detected with the USTER® JOSSI MAGIC EYE in combination with the USTER® JOSSI VISION SHIELD. Practically all types of foreign matter, including polypropylene and polyethylene, are eliminated by USTER® JOSSI MAGIC EYE, with a minimum of waste.
Special challenges for nonwovens producers
Compared to yarn spinning, nonwovens products and processes bring some special challenges and even more demanding require- ments. Imagine, for example, a scratchy remnant of polypropylene in a make-up removal pad…or any kind of contamination in hospital products such as absorbent cotton, alcohol swabs, or nonwoven gauze. Such problems would be totally unacceptable.
Not surprisingly, markets for medical and hygiene products in the USA, Europe and Asia are extremely quality oriented.
With developments in synthetic fibers, there was a trend about 25 years ago for nonwovens applications to switch from pure cotton to synthetics. Initially, consumers preferred the dry and light texture of synthetic fibers. In the last decade, however, many applications are seeing a return to pure cotton as the favored option, particularly where allergenic issues such as skin reddening and irritation are possible. Manufacturers of nonwovens for these demand- ing end-uses now require an efficient contamination control system, guaranteeing a zero-tolerance standard – for defects bigger than 1 mm – in their products. In nonwovens, fiber cleaning is the only way to control contamination unlike in spinning where yarn clearing can make a final check at the winding stage. Product quality in nonwovens therefore depends absolutely on the efficiency of the fiber cleaning sys- tem, which makes investment in the USTER® JOSSI VISION SHIELD system a logical step.
USTER at Index
The importance of the nonwovens sector for USTER® JOSSI systems is demonstrated by the company’s presence at the forthcoming INDEX 2017 event in Geneva (booth no. 4418), the largest global meeting point for the nonwovens market.
USTER believes that its technology which is already well known and appreciated in cotton spinning will attract wider interest at the exhibition from manufacturers of bleached cotton and other qualitycritical nonwovens products.
“With USTER® JOSSI VISION SHIELD and USTER® JOSSI MAGIC EYE, the whole production is checked, for every category of contaminants including synthetics,” says Baldischwieler. “Nothing can escape the detection power of these systems.”