Preview
Improving production technologies for needlefelt nonwovens
For DiloGroup, Techtextil is an opportunity to inform customers and interested parties about new developments aimed at improving production technologies with a focus on needlefelts. With the increased push for sustainability, industrial sectors are requested to achieve savings in material and energy usage. DiloGroup plays an important role by offering solutions for fibre pulp recycling and reduction of energy, water and ancillaries. The company says it has made efforts to meet these challenges together with a circle of partner companies. In this regard focal points of the development work are: 1. Intense needling Needling per se is a mechanical production method with a high energy efficiency. For this reason, the development efforts of DiloGroup aim at producing nonwovens by intense needling instead of water entangling, even for light nonwovens made of fine fibres for the medical and hygiene sector with an area weight of 30-100 g/sqm, the company says. This would result in a reduction of the environmentally relevant production costs; per annum to about 1/3 to 1/5 of current. Despite the prospective advantages of the mechanically intense needling method over the hydrodynamical, water entanglement is currently the most important production method for low area weights and highest production capacity and is also offered by the DiloGroup as general contractor in cooperation with partner companies.
2. Fibre pulp recycling Fibrous material in nonwovens and particularly used clothes can be successfully recycled, if staple length can be conserved in the tearing process. In the classical tearing process, staple lengths are dramatically reduced and therefore these fibres can only be used as base material for inferior uses in thermal or acoustic insulation or in protective textiles, transportation or protective covers etc. When recycling textile waste in the context of the collection of used clothes, the so called “filament-saving” tearing using special tearing machines and methods must be used to produce fibres with longer staple lengths which can be fed to a nonwoven installation. Hence product characteristics can be better specified and controlled. 3. Additive nonwoven production The additive production method of the 3D-Lofter is especially suited for automotive parts with differently distributed masses; but there may also be potential for increasing uses in the sector of apparel and shoe production, says DiloGroup. 4. IsoFeed card feeding In the field of card feeding, the IsoFeed method offers great potential for a more homogeneous card feeding. At the same time it reduces the variation in cross-machine fibre mass distribution and thus the fibre consumption while conserving the end product quality. To discuss further, visit Booth B95 in Hall 12.
Controlling contamination In medical, hygienic and cosmetic
of control over contamination in the carded fleece – and consequently the end product. The risk of contamination, such as small pieces of plastic, reaching the card is that it will be shredded into minute particles and then be incorporated into the material at web bonding. This kind of contamination would be disastrous in a hygiene or cosmetic application which comes into contact with sensitive human skin. With Uster Jossi Vision Shield N integrated in their fibre processing line, nonwovens producers can avoid that risk, says the company. Uster Jossi Vision Shield N uses imaging spectroscope technology to identify contamination in a fraction of a second, instantly removing it from the
mass of good fibre material, the company adds. Detection works across a much greater wavelength than conventional camera systems, so that contamination as small as a single hair and in the lightest colours is pinpointed. Proven contamination control for bleached cotton For best results in contamination detection, Uster Jossi Vision Shield N is integrated right after the opener in the blowroom. At this stage in fibre preparation, detection is enhanced, since the fibre tufts are open, preventing any small contaminants being hidden inside them, Uster says. Once identified, the contaminations are automatically ejected by the system,
applications flawless end-products are essential. And that means contamination in the fibre raw material is not allowed. Technology company Uster says its Uster Jossi Vision Shield N is the solution. It works right at the start, within the process line, eliminating even the tiniest unwanted particles and protecting nonwovens manufacturers from damaging claims, the company says. Optimisation in fibre processes Raw fibres from bales are opened and blended in the blowroom before carding and this stage can significantly influence the quality of the end-product in drylaid nonwovens. Installing an Uster fibre cleaner in the line ensures highest level
8
Powered by FlippingBook