Differential bottom feed

A type of drop feed with two feed dogs arranged in tandem to move differentially. One feed dog is in front of the needle and the other is behind. Material may be gathered or stretched by adjusting the stroke of the front feed dog so that it is longer or shorter respectively than the stroke of the rear feed dog.(sub Category of feed mechanisms(sewing))

Differential drop feed

A type of drop feed with two feed dogs arranged in tandem to move differentially. One feed dog is in front of the needle and the other is behind. Material may be gathered or stretched by adjusting the stroke of the front feed dog so that it is longer or shorter respectively than the stroke of the rear feed dog.(sub Category of feed mechanisms(sewing))

Differential drop feed

A type of drop feed with two feed dogs arranged in tandem to move differentially. One feed dog is in front of the needle and the other is behind. Material may be gathered or stretched by adjusting the stroke of the front feed dog so that it is longer or shorter respectively than the stroke of the rear feed dog.

Differential dyeing

Usually descriptive of fibres of the same generic class, which have potential dyeing properties different from those of the standard fibre. (See also deep dyeing.)

Differential Thermal Analysis

A method of determining the temperature at which thermal events occur in a material undergoing continuous heating.

Diffusion

The movement of substances owing to the existence of a concentration gradient.

Dimensional Restorability

The ability of a fabric to be returned to its original dimensions after laundering or dry cleaning expressed in percent. For example 2 dimensional restorability means that although a fabric may shrink more than this in washing it can be restored to within 2% of its original dimensions by ordinary home pressing methods.

Dimensional stability

1. The ability of a fabric or floorcovering to retain its dimensions when exposed to use and/or an ageing process, to water, washing, steaming, drying or other process.
2. Changes in length and/or width of a textile when subjected to specified conditions.
Note 1: The changes may be positive or negative.
Note 2: The changes may be reversible or irreversible.

Dimensional Weaves

plain twill and satin. All other weaves are derived from one or more of these types. (Also see PLAIN WEAVE TWILL WEAVE and SATIN WEAVE.)

Dimethyl Terephthalate

[p-C6H4(COOCH3)2] An intermediate used in the production of polyethylene terephthalate the polymer from which polyester fibers and resins are made.

Dimity

A fabric, usually of cotton, that is checked or striped by corded effects, made by weaving two or more threads as one.

Dip

1. An immersion of relatively short duration of a textile in a liquid.
2. The depth of liquid in the inner cylinder of a rotary washing machine.
3. A laboratory dyeing, usually to develop a dye formula.

Dip Coating

The process of passing a fabric through a solution of resin or elastomer then through squeeze rolls to remove excess and leave a thin surface layer on the base fabric. In this process both sides can be coated in one pass. (Also see DIP TREATING). © 2001 Celanese Acetate LLC

Dip Dyeing

See DYEING.

Dip Penetration

The degree of saturation through a tire cord after impregnation with an adhesive.