J-box

An upright J-shaped vessel for the continuous steaming or wet processing of textiles.
Note: The material enters the top of the long limb of the J, is stored for a time, and is withdrawn through the short limb.

J-Cut

In tufting cut-pile carpet constructions uneven cutting of the loops caused by poor adjustment of knives and hooks or excessive tension.

J-scray

A J-shaped trough or vessel for the processing of textiles from one process to another. The long limb of the J forms an inclined plane on which the material accumulates during the dwell period.

Jack

1. A blade having high and/or low butts used to actuate the movement of latch knitting needles. 2. Part of a dobby head designed to serve as a lever in the operation of the harness of a loom.

Jack (knitting)

A term used to describe an intermediate selecting element on a knitting machine.

Jack (lace machines)

A spring-steel wire part comprising a straight stem containing a loop near the top, to which a string from the jacquard of a lace furnishing machine is attached, with a point at the top at right angles to the stem. The point can enter between the warp and pattern threads so as to restrict their lateral movement.

Jack bar (lace machines)

A bar on a lace furnishing machine to whichjack leads are attached over the lace-making width of the machine. It imparts a motion to the jacks so that their points enter between the warp and pattern threads, above the guide bars, but below the combs, unless restrained by the jacquard. It is shogged as part of the foundation bar.

Jack lead (lace machines)

A number of lace furnishing machinejacks cast to the gauge of the machine in a lead-alloy base.

Jacket

1. A woven or felted tubular sleeve for covering and shrinking on a machine roll. 2. A short coat. 3. In polymer manufacture an external shell around a reaction vessel. For example jacketed vessels are used when heat-transfer medium is circulated around the vessel.

Jaconet

Light-weight, plain-woven cloth of a lawn or muslin type with a smooth and slightly stiff finish.

Jacquard

A system of weaving that utilizes a highly versatile pattern mechanism to permit the production of large intricate designs. The weave pattern is achieved by a series of punched cards. Each card perforation controls the action of one warp thread for the passage of one pick. The machine may carry a large number of cards depending upon the design because there is a separate card for each pick in the pattern. Jacquard weaving is used for tapestry brocade damask brocatelle figured necktie and dress fabrics and some floor coverings. A similar device is used for the production of figured patterns on some knit goods.

Jacquard (mechanism)

A patteming device and mechanism used to select individual warp threads in weaving or warp knitting, individual threads in lace making, and knitting elements in weft knitting.
Note I:Jacquardcontrol maybebypeggedcard, punchedeard, punchedtape etc, orby electronic means.
Note 2.. Named after the inventor, Joseph Marie Jacquard, 1752-1834.

Jacquard card

A punched card used to control a jacquard mechanism. A series of such cards strung together control the production of the required pattern.
Note: ln many applications jacquards are now controlled by endless paper or an electronic store instead of cards.

Jacquard control mechanisms (lace machines)

Mechanical or electromechanical devices that control the movement of a large number of pattering elements by means of punched cards or a punched continuous strip.

Jacquard design (knitting)

A patterned design produced by the individual selection of knitted stitches.
Note: The term may be further qualified, for example, as 'small area rib jacquard'.