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Difference between warp knitting and weft knitting Warp Knitting:  warp knitting is the method of knitting where the yarn zigzags along the length of the fabric. Weft Knitting:  In weft knitting, the whole fabric could also be produced from one yarn, by adding stitches to every wale successively, moving across the material as during a raster scan. By contrast, in warp knitting, one yarn is required for each wale.                          Difference between warp knitting and weft knitting  Warp knitting Weft knitting The loops are produced to the length of the fabric Weft knitting  loops are produced to the width of the fabric The threads run in the vertical direction The threads run in the horizontal direction In the horizontal direction each loop made from a different thread   A horizontal row of loops can be made by using on the thread It is elastic to the length It is elastic to t

         1. In the past, a bearded needle was used but now a day’s compound needle used       1. A  latch needle together with a wire or blade is used in Raschel m/c      2.   M/C gauge expressed in needle per inch       2.   M/C gauge expressed in needle per 2 inch      3.   Chain link numbering 0, 1, 2, 3, …. etc.      3. Chain link numbered in even numbers 0, 2, 4, …. etc.      4.  The function  of the sinker is holding down,   knocking, and supporting the fabric      4. Sinker performs the function of holding down the loops whilst the needle rise      5.     in Tricot Warp knitting the fabric is drawn away towards the batching roller almost at right angles to the needle bar      5. The fabric is drawn downwards from the needles almost parallel to the bar at an angle of 120°-160°      6. I n  Tricot Warp knitting     warp beams are accommodated in an inclined towards the back of the

Question- A single jersey circular knitting machine of 30-inch diameter, 24 gauge with 96 feeders is running at 20 rpm. If the yarn count is 24 and the stitch's length is 2.8mm then find out the production in kg per hour. Ans: Given that, Diameter = 30" Gauge = 24 Now needle = M/c dia * M/c gauge* π                    = 30*24*301416                     = 2262 Machine RPM= 20 Yarn count = 24   Stitch length = 2.8 mm We know,                                                                      RPM  x  No. of needle  x No. of feeder x stitch length (mm)                                 Production  =  …………………………………..   .......................................................                                                                                   840 x Yarn Count                                                                             20 x 2262 x 96 x 2.8 x 1.09 x 60                            Production  =  …………………………………..   ......

The different techniques for investigation of fiber structure Introduction: Cotton, silk, and wool which are the fibers commonly utilized in the textile industry have recently found competitors in various synthetic products, viz., rayon, nylon, and therefore the rest. The fiber molecular structure is investigated by a special method. employing a different method to work out the chemical groups, molecular spacing, chemical bonding, crystallinity, orientation, spiral turns, molecular packing, the cross-sectional shape of the fiber. Methods for investigation of fiber structure : X-ray diffraction method Infra-red radiation absorption method Optical microscopic method Electron microscopic method Nuclear magnetic resonance method (NMR) Thermal Analysis Density Measurement Chemical Test Analysis of general physical properties.

Positive dobby : The dobby which can raise and lower the heald frame without the use of an additional reversing motion is called a positive dobby. positive dobby is used For weaving heavy fabrics such as fancy woolen and worsted Negative dobby :  only raises the shafts is done by the Negative dobby. Lowering is carried out by spring under motion.   For  light to low medium weight fabrics, Negative dobbies are used .  Positive dobby Negative dobby 1. The dobby can raise and lower the heald shaft. 1. It can raise the heald shaft and lower is done by other mechanisms. 2. The additional arrangement is not required. 2. Additional arrangement (dead wt. /spring) is required. 3. Normally open shed is produced. 3. Closed/semi-open shed produced. 4. Low speed. 4. High speed. 5. Less stress & strain on the warp. 5. More stress & strain on the warp. 6.

Single lift dobby:  In the dobby shedding mechanism where each hook controls a single heald forming a bottom closed shed and the beat-up is done in a closed shed is called single lift dobby.         Single lift dobby is driven from the crankshaft. It is relatively simple in construction. This is now rarely used in weaving silk and rayon. Slow speed. High power consumption. Heavy wear & tear.  The high strain on the warp. Double lift dobby:  In the dobby shedding mechanism where two hooks control a single heald forming an open shed and the weft is beaten up in a crossed shed is called double lift dobby. Double lift dobby is driven from the bottom shaft of the loom. High speed. Less wear & tear, Single lift dobby Double lift dobby 1. It forms a bottom-closed shed. 1. It forms an open shed. 2. Produce intimates the appearance of handloom fabrics, since the beat up is done on the closed shed. 2. B eat

The Dobby  may be a  shedding device placed on  the highest  of a loom  so as  to supply  figure patterns by  employing a  larger no of healds than the capacity of Tappet. To control the movement of the heald shaft in the loom dobby is attached The no of heald shaft in a dobby is given below:                Tappet- 14                Dobby- Theoretical: 48                Practical (Wool & allied):36                Practical (cotton & allied): Maximum 24                (At least 12 heald shafts are used) In this case, the healds are all operated by jacks and levers and occupy less space as compared to the tappet shedding mechanism. In the dobby shedding mechanism, it is very easy to change the pattern and it gives a good scope for weaving designs repeating a large no of picks and ends. Classification of dobby :         1. According to lift:                                (a) Single lift                                (b) Double lift         2.

In textile production, there is no way to lose extra  time. Here the priority is given to time because in textile main aim is more production. That's why saving time in the textile industry short form is very popular. In this article, I am trying to provide you some but most used term and their full Form. RMG Ready-Made Garment ISO International Organization for Standardization ANSI American National Standards Institute CIF Cost, insurance, and freight CITA Committee for the Implementation of Textile Agreements CM Cut and Make COP Cost of Production EIN Exporter Identification Number ETD Estimated Time of Departure EXW Ex-works EU European Union FDI Foreign Direct Investment FOB Free onBoard FTA Free Trade Agreement GATT General Agreement on Tariffs and Trade