Snapshot

Chemical or resin bonding is a generic term for interlocking fibers by the application of a chemical binder webs by saturating, coating or spraying, printing (as in print bonding) or foaming technics. Saturation chemical bonding involves complete immersion of the nonwoven web in a bath containing binder. Three variations of saturation bonding exist: screen, dip/squeeze, and size-press. Foam bonding is a means to apply binder at low water and high binder-solids concentration levels. This requires less energy in drying, since less water is used. Spraying is when binders are sprayed onto moving webs. These are used for fabric applications which require the maintenance of high loft or bulk, such as Fiberfill and air-laid pulp wipes. Printing method applies binder only in predetermined areas. It is used for fabric applications that require a part of the area of the fabric to be binder-free, such as wipes and cover stocks.

Chemical binders are polymers that are formed by emulsion polymerization. The mostly used binders today are water-borne latexes. Latexes are extensively used as nonwoven binders, because they are economical, versatile, easily applied, and effective adhesives. Most latex binders are made from vinyl materials, such as polyvinylacetate, polyvinylchloride, styrene/butadiene resin, butadiene, and polyacrylic, or their combinations.

The use of chemical binders remains one of the most versatile and useful ways of manufacturing nonwoven webs.  There are many different classes of chemical binders to choose from which allows the manufacturer to tailor make a nonwoven web to meet the desired performance characteristics.  Because of this, chemical bonding is used to make nonwoven webs for a variety of applications. The chemical bonding process is used to develop nonwovens used as Wipes and towels, Medical nonwovens, Roofing products, Apparel interlinings, Filter media, Coating substrates, Automotive trim, Carrier fabrics, Bedding products (high loft), Furniture applications (high loft) and Apparel Pillows (high loft).

 

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