Houndstooth

A term describing a medium-sized broken-check effect; the check is actually a four pointed star.

Houndstooth check

A small colour-and-weaive effect in a fabric produced by a combination of 2/2 twill weave and 4 and 4 order of colouring in warp and weft. (See also shepherd's-cheek effect.)

HOY

A melt-spun continuous-filament yarn that has been highly oriented either by drawing at a high draw ratio (preferred term, fully drawn yam) or by spinning at a high wind-up speed such that little residual drawability remains (preferred term, highly oriented yarn). (See also draw-twist, draw-wind, spin-drawing and draw-spinning.)
Note: These terms are used in contrast to low orientation yarn and partially oriented yarn.

HT dyeing

Dyeing at high pressure (above atmospheric) in order to dye at a temperature above the normal boiling point.

Huckaback

1. (Weave) A weave used principally for towels and glass-cloths in which a rough-surface effect is produced on a plain-ground texture by short floats, warp on one side and weft on the other.
2. (Fabric) A fabric made in huckaback weave.

Hudson's Bay blanket

A well-milled and raised heavy-weight blanket, made from coarse long-staple wool, first supplied to the Hudson's Bay Company in 1780. Made with a solid ground and coloured end border, or striped all over, or solid colour with darker end border. Near one corner a number of short stripes or 'points' are woven into the edge of the blanket at right-angles to the selvedge. A 'point' stripe is about 1 I cm long, and a 'half-point' about 6cm long. Originally each point indicated a barter-value of one Made-beaver, a prime quality skin from an adult beaver. Today the @point' system is used as an indication of blanket size.

Hudson's Bay Point blanket

A well-milled and raised heavy-weight blanket, made from coarse long-staple wool, first supplied to the Hudson's Bay Company in 1780. Made with a solid ground and coloured end border, or striped all over, or solid colour with darker end border. Near one corner a number of short stripes or 'points' are woven into the edge of the blanket at right-angles to the selvedge. A 'point' stripe is about 1 I cm long, and a 'half-point' about 6cm long. Originally each point indicated a barter-value of one Made-beaver, a prime quality skin from an adult beaver. Today the @point' system is used as an indication of blanket size.

Hue

That attribute of colour whereby it is recognised as being predominantly red, green, blue, yellow, violet, brown, etc.

Humidity

The mass of water vapour present in unit volume of moist air. A typical unit is gram per cubic metre (g.m-3).

Hungback

A light weight warp-backed (or weft-backed) overcoating fabric, usually having a 2/2 twill ground weave, made from woollen yarns, with extra 'hung' threads (cotton, silk, worsted or manufactured fibres) forming checks or stripes on the back of the fabric. The 'hung' threads are finer than the ground threads and in the case of 2x2 twill ground weave will have a 3x 1 (or 1 x2) twill weaive.

Hungry cloth

A cloth with an unsatisfactory cover. It is sometimes said to be grinning and is known also as 'hungry cloth'.

Hybrid Composite

Advanced composite with a combination of different high-strength continuous filaments in the matrix. Also composite in which continuous and staple fibers are used in the same matrix.

Hybrid Fabric

Fabric for composite manufacture in which two or more different yarns are used in the fabric construction. This provides design flexibility to meet performance requirements and controls cost by permitting some lower priced fibers to be used.

Hybrid Yarn

In aerospace textiles a yarn having more than one component. (Also see COMMINGLED YARN.)

Hydraulic Entanglement

See HYDROENTANGLING.