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Most of the polymers used in the spun-melt process create fibers that do not wet and are inherently water-repellent or hydrophobic. Many nonwovens are used in diapers, wipes, and other hygiene-related products. For these products, liquid transfer and absorbency are essential to how they function. One of the most important finishing coatings is the addition of a rewetting compound, which converts the sheet into a hydrophilic material, which is one that wets and allows water to pass through.
This is typically done by passing the bondage sheet over a roll wetted with the rewetting compound, or a surfactant. After the application, the sheet must be dried before being wound on the parent roll. Other coatings used include antistatic compounds, softeners, and additives to enhance product performance and customer satisfaction.