Aerosol

Actual project

Numerous finishes or finishing effects are applied by simple dipping or padding processes. A liquor up-take in the range of 100% of the substrates weight has to be expected for this kind of application. This means high amounts of solvent – basically water – and finishing agents are applied. Such an application is necessary in many cases, nevertheless it has certain drawbacks. Due to the high amounts of liquor that is soaked up, high amounts of solvent have to be removed in the following drying process – which is one of the reasons why in textile finishing energy consumption is high. To guarantee homogeneous effects the dipping processes often work with high concentrations of the finishing agents in the liquors, which means in many case the amount applied is higher than necessary to achieve the effect. Furthermore modifications are always both-sided.

Aerosol technique promises interesting potentials for improving finishing processes. Aerosol techniques means the finishing products are applied as a dispersion of tiny drops – comparable to a fog. The technique allows to homogeneously apply very low amounts finishing agents in a continuous process. Recent investigations aim on the possibilities of aerosol-based finishing with conventional finishing products used for achieving e.g. antistatic, hydrophobic, hydrophilic, or soft hand properties. Advantages of aerosol technique are in the reduction of the amounts of finishing agent applied as well as in the saving of process water. Resulting from this the energy demand for the drying processes as well as the amounts of waste water are enormously reduced. Additionally this kind of low add-on allows the realisation of effects that are limited to a single side of the products. To give an example, a textile can be prepared that soaks up water from the one side but is repellent from the other side (photography).

IGF-Project-No. 15920N

contact: Dr. Rainer Benken, Tel.: +49 2151-843-207, benken@dtnw.de