Sandler AG » Our Company » Technologies
“Nonwovens are diversity. A permutation of raw materials, web forming and bonding processes creates a plethora of possibilities. The properties of the end product can be specifically adapted to the requirements of the respective market, either through choice of fibre, bonding method or by creating a composite with other materials. Offering this diversity from a single facility makes Sandler a competence centre for the production of nonwoven roll-goods. Continuous investment in state-of-the-art manufacturing technology, online monitoring systems in production, comprehensive testing in our in-house laboratory and cooperation with external institutes are the cornerstones of our high quality standards. They also promote us as a technology leader for innovative nonwoven solutions on which we work closely with our customers from initiation to completion.”
High-pressure water jets are fired at a fibrous web to create the nonwoven. Since 2003, we have been operating this technology to produce nonwovens that are being used on a daily basis as skin-friendly facial tissues or highly absorbent cleaning wipes to facilitate ease of household chores. Product differentiation can be introduced by embossing with individual designs. Using state-of-the-art production lines, Sandler also exploits various technical applications for spunlace nonwovens.
During the through air bonding process, fibres with different melting points are fused together using hot air dryers. In the thermal bonding process, fibres are fused by means of heat and pressure between heated calendar rollers. The results are soft, homogeneous nonwovens that are ideal for direct contact with the skin but are also suitable for technical applications and bulky upholstery materials. We have been utilising these technologies since 1973 and through continuous optimisation, we repeatedly exploit new applications.
Whether nonwovens are combined with other nonwovens or simply with other materials to create a composite, they render an outstanding performance particularly when used in a multi-layer format. And they do so in every application from filters to diapers. The individual layers are often manufactured using different techniques and joined at a later stage. Since 1978 we have been banking on this “teamwork of materials”— by means of ultrasonic welding, hot-melt or thermal lamination, embossing or moulding.
In this process, the fibres of the web are interlaced using needles. The resultant nonwoven has a high tensile strength in both the machine and cross machine directions. This technology has been in our portfolio since 1968. First used primarily for the production of cleaning cloths, the needle-punched nonwovens of today, bulky or of a dense construction, are utilised as sound and heat insulation media in construction, industry and the automobile, but also still in home textiles.
Since 1999, meltblown media have been a part of our product range. Compared with other bonding technologies operated by Sandler, it uses granules as the basic raw materials rather than fibres. In this process, the raw resin is melted and then spun out into extremely fine fibres using pressure and hot air. After cooling and depositing on a conveyor belt, these so-called filaments form nonwovens with extremely small fibre diameters, rendering them ideal for filter media demanding durability and high performance.