Overlock seam

Two or more superimposed plies of material, aligned along their edges, are joined together, edge-trimmed and oversewn in one operation, with overedge stitches having two or more threads.(sub category of seam type)

Overlooking

The joining of two or more pieces of fabric by means of a double or treble chain-stitch, which is brought round to join and cover the edges, one or more of which have been cut by knives incorporated in the machine. This operation is performed on overseaming machines.

Overspraying

A term sometimes used to describe the application by spraying of a fiber lubricant to staple fibers during opening and blending.

Overtufting

A patterning technique in which additional yarns are tufted into a pre-made carpet fabric.(sub category of patterning systems tufting machine (carpet))

Oxford

A plain-weave shirring of good-quality yarns that has two warp ends weaving as one. Fancy weave effects can be incorporated, and dyed yarns are used to form stripes. Typical cotton-type construction: 35x20; 20x30tex; K=15.6+10.9.

Oxford Cloth

A soft but stout shirting fabric in a modified basket weave with a large filling yarn having no twist woven under and over two single twisted warp yarns. The fabric is usually made from cotton or polyester/cotton blends and is frequently given a silk like luster finish.

Oxidized oil staining

Staining of textiles caused by oxidation of oil acquired or applied during processing.
Note.. The presence of oxidized oil may cause discoloration and affect the dyeing property of the material. In the manufactore of woollen and woi-sted yarns, this discoloration is sometimes referred to as 'yellowing' or 'bronzing'.

Oxygen index

The minimum concentration of oxygen in a mixture of oxygen and nitrogen that will just support combustion of a material under specified test conditions.

Oxygen index

The minimum concentration of oxygen in a mixture of oxygen and nitrogen that will just support combustion of a material under specified test conditions.

Ozone fading

An irreversible change in hue that occurs when dyed or printed textiles are exposed to ozone. Ozone fading is particularly prevalent under severe conditions of atmospheric pollution.