Heat Resistance

A property of certain fibers or yarns whereby they resist degradation at high temperature. Heat resistance may be an inherent property of the fiber-forming polymer or it may be imparted by additives or treatment during manufacture. (Also see HEAT STABILIZED.)

Heat setting

set in which a structural change takes place that cannot be reversed. More severe setting treatments may cause further irreversible changes of structure.
Note 2: The term is sometimes used in conjunction with a description of the particular characteristic to be stabilized (e.g., crepe setting, crimp setting, flat setting, twist setting) or of the setting medium (e.g., heat setting, steam setting, thermal setting)

Heat Stabilized

A term to describe fiber or yarn heat-treated to reduce the tendency of the fiber to shrink or elongate under load at elevated temperature. (Also see HEAT RESISTANCE.)

Heat Transfer Printing

A method of printing fabric of polyester or other thermoplastic fibers with disperse dyes. The design is transferred from preprinted paper onto the fabric by contact heat which causes the dye to sublime. Having no affinity for paper the dyes are taken up by the fabric. The method is capable of producing well-defined clear prints.

Heat-Setting

The process of conferring dimensional stability and often other desirable properties such as wrinkle resistance and improved heat resistance to manufactured fibers yarns and fabrics by means of either moist of dry heat.

Heather Yarn

A term describing mottled or melange-type yarns. © 2001 Celanese Acetate LLC

Heavy Filling

See COARSE THREAD.

Heavy Pick

See COARSE THREAD.

Heavy Tow

Nonuniform distribution of filaments across towband width.

Heavyend

1. The higher boiling fraction in distillation. 2. See COARSE THREAD.

Heddle

A cord round steel wire or thin flat steel strip with a loop or eye near the center through which one or more warp threads pass on the loom so that the thread movement may be controlled in weaving. The heddles are held at both ends by the harness frame. They control the weave pattern and shed as the harnesses are raised and lowered during weaving.

Held loop (knitting)

A loop which, having been pulled through the loop of the previous course, is retained by the needle during the knitting of one or more additional courses.

Helical selvedge

A set of threads making a half or complete revolution around one another between picks at the edge of a fabric.(sub category of selvedge woven , list, listing)

Helix Angle

1. The angle formed by the path of a ply and the major axis in a yarn or tire cord. 2. The angle between the tangent to a yarn and the minor axis of the package on which it is wound. Also called wind angle.

Hemicelluloses

The principal noncellulosic polysaccharides in wood. Wood contains 28 to 35% hemicelluloses the balance being cellulose and lignin.