Coated fabrics for soft luggage & protective garments

Coated fabrics for soft luggage & protective garments

What is coating?

Coating is carried out to impart certain desired characteristics and functionalities to woven, knitted or non-woven materials. One or two sided application of coating compounds is done on foam films to woven fabric, knit goods, non woven fabrics and such application of coating compounds is imparted by means of roller system, knife coating, hot-melt and transfer coating methods.

Coated fabrics have wide applications in fields such as medical substrates, protective clothing, flexible membranes for civil structures, soft luggage, geo textiles, industrial fabrics, defense, transportation, healthcare, architecture, space, sports, environmental pollution control, and may other diverse end-product uses. Extensive research is being done on a global basis, and many new products, such as breathable fabrics, thermo chromic fabrics, and charcoal fabrics, are entering the market.

Besides the classic knife application methods, there are also numerous other methods:

Impregnation or dipping method: The carrier material is led through an immersion trough which holds the liquid coating compound.

Slop-padding process, roll coating: The carrier material takes on the coating compound from a roller that turns through a bath (direct roll coating). This can also take place via roller systems. Dosing is by wiping off the slop-pad roller or the coated goods. If the paste reservoir is located in the angle between two rollers, this is termed as the roll coating method (reverse roll coater).

Hot melt method: With this method, granules and powders are melted between two rollers or prepared viscous plastic compounds are used, which are plasticized by the heat of the rollers. Between the calendar rollers, which can be arranged in various ways, films form which can be transferred to the goods via the rollers. Hot melt adhesives are thermoplastic, based on the polymers that become liquid between temperatures of 800 C - 2200 C and solidify again by cooling down. Ethylene vinyl acetate, polyamide, polyurethane reactive are generally used on hot melt additives for hot melt coatings. It is important to handle the system carefully. The coating head is positioned near to the substrate to avoid any temperature changes of the hot melt due to cold air flow.

Powder application method: Here, powdered thermoplastic synthetic polymers are scattered and formed into adhesive melts. This coating technique can be subdivided into two groups: the dry method and the wet method, which are used particularly for interlining fabrics for clothes. Generally, machines available for application of dot coating from 3 to 40 g/m2 while multi-roller application systems can deliver full and open cover structure lamination/coating from 5 to 150 g/m2.

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