C. Schmidt Henkel (Germany)
Abstract: The application of hot melt adhesives in textile lamination has become increasingly popular. When deciding on a new engineering investment, because of its many advantages compared with traditional technology, manufacturers have gradually tended to use hot melt adhesives to replace traditional technology. Henkel, one of the leading manufacturers of industrial adhesives, exhibited a range of textile laminates with new product solutions at the 2010 Frankfurt Industrial Textiles Fair.
Keywords: hot melt adhesive, textile laminate, latex dispersant system Hot melt adhesives play an increasingly important role in textile lamination applications. Compared with the traditional method, the hot melt technology has many advantages in process configuration, which can reduce the product cost and play a positive role in environmental protection. As a result, almost all well-known coating equipment manufacturers are producing textile laminators for a variety of coating methods. The hot melt adhesive is present in solid form, melted between 90 and 180 ° C, and then applied as a liquid to the two mating substrates, and the two immediately bond. The type of adhesive required depends on the coating method used, the material of the coating, and the criteria for bonding.
Relying on the two brands of Liotex and PUR-Fect, Henkel has introduced a wide range of products that combine exceptionally high performance materials with high performance textile composites. Modern application examples include carpet linings and foam coated fabrics. Henkel has developed a wide range of high performance hot melt adhesives to meet the specific application needs of each area.
In the production of carpets, floor coverings and artificial turf, latex dispersants have so far been regarded as the leading technology for protecting fibers in linings or base fabrics. But in the development of new equipment, carpet manufacturers are increasingly keen on hot-melt adhesives because hot melt technology has more advantages than latex coating systems.
The hot-melt adhesive consists entirely of solid materials. It differs from the latex dispersant system in that there is no waste of water in the process of melting the binder. The applied latex dispersant is half volatilized during the subsequent drying process. However, the use of hot melt adhesives can completely reduce the drying process required, resulting in significant savings in energy costs. Intuitive comparisons measured by Henkel show that hot melt adhesives can reduce costs by nearly 70%, even when the energy consumed to melt the binder is taken into account. Yet another advantage is that the Liotex adhesive has a shorter cure time. The rapid cooling of the melt used can provide a number of benefits, such as further processing of the carpet product without consuming a significant amount of time. In order to enhance the shape of the product, the second layer of material can also be laminated while hot-melting, which significantly simplifies the production process, which is not possible with latex dispersant technology.
Modern hot melt technology is also being used in the field of foam coated textiles due to its good environmental compatibility. Whether it's automotive interior materials or the production of women's bras, polyurethane-based reactive hot melts have become a popular technology, replacing flame-melting lamination techniques that produce composites by flame-forming the top layer of the foam. A major advantage of hot melt adhesives compared to flame fusion lamination is that the coating process does not emit CO2 at all. Therefore, the application of this new technology reduces the additional investment in costly safety equipment such as activated carbon filters.
Considering the loss of material through the foam flame, the cost of the two technologies is very close. In addition to the environmental compatibility advantages mentioned above, Henkel's brands Liotex and PUR-Fect hot melt adhesives offer greater market flexibility in the choice of laminates. For example, in the production of high quality soldering furnaces, the use of aliphatic polyurethane foams continues to increase, and the foam does not turn yellow over time, and does not yellow even when exposed to ultraviolet light. However, like other materials, the foam is also not suitable for flame fusion lamination. Therefore, no matter what direct comparison, hot melt technology provides a powerful and convincing basis for the wide application of textile lamination. Wang Peng translated Li Lanling School
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