Warp Knitting Basics of Knitting PDF

28 / KNITTING VIEWS / JANUARY-FEBRUARY 2012 A nother interesting segment of the knitting industry is the warp knitting. Warp knitting is defined as a loop forming from weft-knit and their machinery. In warp...

28 / KNITTING VIEWS / JANUARY-FEBRUARY 2012 A nother interesting segment of the knitting industry is the warp knitting. Warp knitting is defined as a loop forming from weft-knit and their machinery. In warp knitting, each needle loops have its own thread, means there is one warp for one stitches on the face of the fabric appear vertically, but at a slight angle; and the stitches on the back appear horizontally process in which the yarn is fed into wale, and it also differs in the way in which as floats at a slight angle. knitting zone, parallel to the fabric the yarn is fed to the needles. Further, the These floats called laps, or under laps, is a selvedge. Warp knitted fabrics are a source of yarn on a warp-knitting machine distinguishing identification of warp knits. product of a technology process carried is a warp beam containing a very large Warp knitting may be flat or tubular and out on warp knitting machines. number of parallel yarns, similar to a warp can be produced in many varieties of The history of warp knitting is closely beam on a loom. Sometimes, more than one patterns. It can yield cloth with a associated with two names, William Lee warp is needed, depending upon the dimensional stability almost equal to that and Karl Mayer. In 1589 William Lee fabric design. of woven fabric. Yet, a modern 28-gauge applied for patent of his first machine for machine can produce a cloth 168 inches making knitted articles, in that way he laid wide at a rate of 1,000 courses per minute the foundations for mechanical that is 4,700,000 stitches per minute. manufacturing and making the technical base to develop warp knitting technology. In 1947, the insightful entrepreneur and mechanic, Karl Mayer showed off first warp knitting loom. The machine was compiled two guide bars, and with bearded needles, attained a speed of 200 rpm. It 13.2: Basic weft knit (a) and warp knit marked the starting of technical era in (b) loop pioneering leaps in the field of warp knitting. 13.4: Warp knit fabric (face) The subsequent The subsequent loops formed loops formed from from one thread one thread are are placed in the placed in the same course subsequent courses 13.3: Weft and warp knitted structure 13.5: Warp knit fabric (back) In weft knitting, a single yarn end may be fed to all the needles and knitting Advantages of warp knit fabric progresses around, or across the machine Dimensional stability Fig 13.1: Warp knitted fabric to produce the weft knitted fabrics for any In general, warp knitted fabric are more number of courses and wales. Warp and weft knitting are similar fabric stable than weft knitted fabric. By manufacturing processes as both utilise In warp knitting, however, each needle is modifying its structure (by weft needles to form and intermesh loops. As supplied with a yarn (or yarns) and all the insertion), the warp knitted can be as the name implies, the loop formation is needles knit at the same time producing a good as woven fabric warp wise, i.e., vertically upward. Unlike, complete course at once so the total Fabric tightness number of individual yarns is equal to the weft knitting, most of the warp knitting The warp knitted fabrics are thinner than machine is open width/flat knitting. total stitches in a row. The needles produce double knitted fabrics and the loops are Generally, warp knitting is done by parallel rows of loops simultaneously that smaller than double knitted fabric machine, whereas weft knitting is done by are interlocked in a zigzag pattern, as shown in fig 13.5. In this way, the warp Fabric appearance both hand and machine. knitted fabric is formed by knitting the warp Most regular warp knitted fabrics give Formation of warp knit fabrics yarns on the adjacent needles course by a nice, clean and balanced loop on Warp-knit fabrics and the machinery used course and intermesh the loops with the surface. Normally the technical face and to produce them are substantially different neighbouring yarns to form fabric. The back for warp knitted are different