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Dd<br />
Decitex (Dtex)<br />
Weight in grams of 10,000 meters of a fiber. It is one-tenth of a tex (see Tex).<br />
Defiberize (defibrate)<br />
A process used to reduce fiber aggregates, such as wood pulp, into individual fibers. This is<br />
done by using hammermills or lickerins.<br />
Defoaming agents<br />
See Antifoaming agents.<br />
Degradation<br />
Deterioration of aesthetic and functional properties of a product – usually after being exposed<br />
for some time to heat, cold, light, or use.<br />
Degree of polymerization<br />
The average number of molecules (see Monomers) in a polymer.<br />
Dehumidify<br />
To remove water vapor from an airstream or from air in a space.<br />
Delamination<br />
Tendency of a fabric to be pulled apart (layer separation) by normal surface forces or shear<br />
tensions.<br />
Delustrant<br />
An additive that is used to dull the luster and to increase the opacity of a fiber or a fabric.<br />
The degree of delustering is termed semidull, dull and extra dull, depending on the amount of<br />
pigment added.<br />
Denier<br />
The measure of a weight per unit length of a fiber. Denier is numerically equal to the weight<br />
in grams of 9,000 meters of the material. Low numbers indicate fine fiber sizes and high<br />
numbers indicate coarse fiber sizes. The tex system is used in countries outside the United<br />
States. A tex is numerically equal to the weight in grams of one kilometer of fiber. It can be<br />
calculated by dividing the denier by nine.<br />
Depth filter<br />
A filter medium which is thick and captures particles within the media.<br />
16 <strong>Nonwovens</strong> <strong>Glossary</strong>
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