Abstract
Novolac resins are used to prepare high-performance flame-retardant fibers, which are also supplied under the brand name Kynol fibers. In the current study, Kynol fiber materials are treated with a laser beam to introduce dark coloration at distinct areas on the textile surface. By this, imaging and writing on the textile surface is possible. For investigation, two different types of Kynol fiber materials are used - a non-woven fiber felt and a woven fabric. It is shown that a laser treatment of medium intensity can introduce a change to dark coloration with good rubbing fastness. The writing of letters and symbols onto fabrics is possible. However, treatments with strong laser intensity lead to significant fiber damages and low rubbing fastness. Nevertheless, the presented method is a promising tool to apply images onto flame retardant fabrics from high performance fibers, which are difficult to dye using conventional techniques of dyeing and printing.
Highlights
High performance fibers are fibers containing at least one outstanding property, which conventional fibers do not have
The amount of energy applied by the laser onto the fiber is determined by the speed of the laser driven over the fabric surface
Kynol fiber materials are investigated as an example for a flame-retardant high-performance fiber
Summary
High performance fibers are fibers containing at least one outstanding property, which conventional fibers do not have. These outstanding properties can be e.g. high strength, high chemical stability, high thermal stability or flame-retardant properties [1]. One very prominent example for a flame-retardant high-performance fiber is Kevlar made from paraaramid. Flame-retardant fibers based on other polymer materials are developed [1, 2]. One innovative approach to realize flame retardant fibers is the use of polymer resins as fiber forming materials. Fibers based on novolac resins are offered under the brand name Kynol fibers [3]. Novolac fibers contain originally a strong orange coloration, which is related to a low reflection of UV light and blue light (Figure 2)
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