Moir'e fabric

A ribbed or corded fabric that has been subjected to heat and heavy pressure by rollers after weaving so as to present a rippled appearance. The effect arises from differences in reflection of the flattened and the unaffected parts. This type of fabric is also correctly described as watered'.

Moiré

A wavy or watered effect on a textile fabric especially a corded fabric of silk rayon or one of the manufactured fibers. Moiré is produced by passing the fabric between engraved cylinders which press the design into the material causing the crushed and uncrushed parts to reflect light differently.

Moire fault

An undesirable shaded effect produced when the weave pattern of one fabric is accidentally impressed on to the face of another fabric, usually under heat and pressure during processing, e.g., beam dyeing.

Moire finish

A watered or rippled appearance on the surface of a fabric. The effect is obtained by passing two layers of a rib or cord fabric between heavy heated rollers or by passing the fabric between suitably engraved calender rollers. Originally developed for silk fabrics, but good results can be obtained on cotton and manufactured fibre fabrics. There are many styles of moire finish.

Moirette

A plain-woven cotton fabric, with a predominance of warp or weft, creating lines across or down the fabric respectively, e.g., 44x25; R20/2xR30/2tex; K=19.7+13.7. Polished cotton weft is used (see polishing). The finish is the same as for moreens.

Moisture and extractable component

The mass of water in any form plus extractable matter in a material, determined using prescribed methods and expressed as a percentage of the mass of the extracted and dried material.

Moisture content

The ratio of the mass of moisture in a material to the total moist mass. The ratio is usually expressed as a percentage and is calculated as follows:Total moist mass - Dry mass * 100/ Total moist mass

Moisture Properties

All fibers when exposed to the atmosphere pick up some moisture; the quantity varies with the fiber type temperature and relative humidity. Measurements are generally made at standard conditions which are fixed at 65% RH and 70°F. Moisture content of a fiber or yarn is usually expressed in terms of percentage regain after partial drying.

Moisture regain

The ratio of the mass of moisture in a material to the oven-dry mass. The ratio is usually expressed as a percentage and is calculated as follows:Total moist mass - Oven dry mass X 100/ Oven - dry mass

Moisture regain in the standard atmosphere

The mass of water in any form which a material contains when, after preconditioning, it comes into equilibrium with the standard atmosphere, determined using prescribed methods and expressed as a percentage of the mass of the dried material.

Moisture-Free Weight

1. The constant weight of a specimen obtained by drying at a temperature of 105°C in a current of desiccated air. 2. The weight of a dry substance calculated from an independent determination of moisture content (e.g. by distillation with an immiscible solvent or by titration with Fischer reagent).

Moitv wool

A term, used mainly in the U.K., for wool containing vegetable matter (straw, hay, twigs, etc.), picked up by sheep during grazing.

Molar mass

The average of the sum of the atomic weights of the atoms present in the chains of individual macromolecules in a polymer. This will in general depend upon the basis on which it is measured or calculated, and this should be stated, e.g., number average, weight average or viscosity average.

Molecular weight (polymer)

The average of the sum of the atomic weights of the atoms present in the chains of individual macromolecules in a polymer. This will in general depend upon the basis on which it is measured or calculated, and this should be stated, e.g., number average, weight average or viscosity average.

Moleskin

A heavy sateen-weave fabric made with heavy soft-spun filling yarns. The fabric is sheared and napped to produce a suede effect.