丹尼是紡織術語.
丹尼的定義是: 一條9000公尺的纖維的質量(公克).

例如,一條9000公尺的纖維的重70公克,那麼就是70丹尼.

http://en.wikipedia.org/wiki/Denier_%28measure%29

Denier is a unit of measure for the linear mass density of fibers. Denier is defined as the mass in grams per 9000 meters.

One can distinguish between Filament and Total denier. Both are defined as above but the first only relates to a single filament of fiber (also commonly known as Denier per Filament or D.P.F) whereas the second relates to an agglomeration of filaments.

The following relationship applies to straight, uniform filaments:

D.P.F. = TotalDenier / QuantityofUniformFilaments
The denier system of measurement is used on two and single filament fibers. Some common calculations are as follows:

1 denier = 1 gram per 9000 meters
= 0.05 grams per 450 meters (1/20th of above)

This unit of measure is not in the International System of Units: dtex should be used instead.

Examples
A fiber is generally considered a microfiber if it is 1 denier or less.
A 1-denier polyester fiber has a diameter of about 10 micrometres.
Denier is used as the measure of density of weave in tights and pantyhose, which defines their opaqueness.
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