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Ww<br />
Warp<br />
The yarns that run in the machine direction of a woven fabric.<br />
Warp knitting<br />
See Knitting.<br />
Wash and wear properties<br />
Ability of a fabric to retain its strength and appearance after repeated washings and dryings.<br />
Water repellency<br />
The ability to resist wetting by water.<br />
Weak web<br />
A term generally used in the context of web formation in a carding process. It refers to the<br />
low cohesion of the fibers to one another and thus the web does not have the strength to<br />
transfer from one working component to another in the carding process. This situation can be<br />
caused by a number of factors, such as poor fiber finish or humidity problems.<br />
Wear test<br />
A test that evaluates a fabric’s properties in actual use through laundering, cleaning and other<br />
wearing conditions.<br />
Web<br />
A sheet made by laying down and assembling fibers or by creating holes or cracks in a plastic<br />
film.<br />
Web consolidation<br />
See Bonding.<br />
Weight<br />
The mass of a fabric expressed in grams per square meter or ounces per square yard.<br />
Wet laid definition<br />
To distinguish nonwovens from papers, a wet laid material will be defined a nonwoven if:<br />
More than 50%, by mass, of its fibrous content is made up of fibers (excluding chemically<br />
digested vegetable fibers) with a length to diameter ratio greater than 300:<br />
or<br />
More than 30%, by mass of its fibrous content is made of fibers in “a” above and meet one<br />
or both of the following criteria:<br />
Length to diameter ratio of more than 600.<br />
The density of the fabric is less than 0.4 g/cc.<br />
62 <strong>Nonwovens</strong> <strong>Glossary</strong>
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