Louring (hat manufacture)

The improvement in the lustre of felt hoods or bodies by the application of fat using a hot pad.

Lousiness

All inherent fault in silk only apparent after degumming or dyeing. It is characterized by fine fibrils or fibrillae that become separated from the filament, so giving a speckled, dishevelled appearance.

Low add-on finish

A finish based on a low wet pick-up process which enables a lower solids add-on to he used to attain the required properties.

Low orientation yarn

A yarn of low molecular orientation suitable for orientation by drawing at a high draw ratio.
Note: This term is used in contrast to fully drawn yarn, partially oriented yarn and fully oriented yarn.

Low Rows

A carpet defect characterized by rows of unusually low pile height across the width of the goods.

Low wet pick-up finish

Application of a chemical finish either by a topical technique (see topical finishing), e.g., lick roller, spray or foam applicator, or by an impregnation-removal method, e.g., vacuum extraction or use of porous bowls, to give a reduced wet pick-up significantly lower than by conventionalpadding.

LOY

A yarn of low molecular orientation suitable for orientation by drawing at a high draw ratio.
Note: This term is used in contrast to fully drawn yarn, partially oriented yarn and fully oriented yarn.

LR

The ratio of the weight of liquor employed in any treatment to the weight of material treated.
Note..'Short' and 'long' are often used to describe low and high liquor: goods ratio, respectively.

Luana

A fabric characterized by a crosswise rib effect usually made with a filament yarn warp and a spun yarn filling.

Lubricant

An oil or emulsion finish applied to fibers to prevent damage during textile processing or to knitting yarns to make them more pliable.

Lucet

A lyre-shaped hand tool of ancient origin, some 70cm to 150cm long, made from thin rigid material such as wood, horn, ivory, etc. It was used for making square knitted cords with low stretch and good strength characteristics, and was widely used until the advent of the industrial revolution when the manufacture of cords and laces became a machine operation.

Lucetted cord

Square knitted cord produced with the aid of a lucet.

Luminance

For a coloured object, luminance is a measure of the apparent overall reflectance. For a light source, luminance is a measure of the apparent brightness of the light.

Luminescence

Emission of light not caused by incandescence but rather by physiological processes chemical action friction or electrical action. (See both FLUORESCENCE and PHOSPHORESCENCE.) © 2001 Celanese Acetate LLC

Lump

A length of unfinished fabric, usually longer than the customary piece length.
Note: This term seems to originate in its literal meaning as applied to the appearance of woven cloth when removed by hand from the loom.