The arranging of yarn threads in long parallel lengths of equal tension, onto a beam in preparation for weaving.During the warping process cones of yarn are placed onto a rack called a creel. From this creel yarn passes through tension and spacing devices and through a leasing reed which separates the yarn threads and keeps them in the correct order before being wound onto a warping balloon.Selvedge means the edge of a fabric that is woven so that it will not ravel or fray.
Wavy twills are also known as pointed twills. In these classes of twill weaves the twill progresses in one direction for half of the repeat and then is reversed for the next half of the repeat. The reversal of the twill may be done in a regular or irregular manner primarily considering the series of threads that predominate the face of the fabric. Thus warp way reversal is where the warp predominates over the weft and weft way reversal where the weft predominates over the warp.
These twills are obtained by arrangement of a continuous twill either warp way or weft way. There arrangement is normally done in a particular order or sequence. Rearranged twills are of two types Satin/sateen weaves and Corkscrew weaves.
Sizing is a complementary operation which is carried out on warps formed by spun yarns with insufficient tenacity or by continuous filament yarns with zero twist. It is done with an aim of improving yarn smoothness and tenacity during the subsequent weaving stage. The sizing methods change depending on the type of weaving machine used, on the yarn type and count, on the technician's experience and skill, on the kind of material in progress.
To obtain satisfactory weaving performance, it is essential to have not only a correct yarn preparation, but also an efficient organization which permits to have warps available at the right moment, thus avoiding any dead time with style or beam change.
Combination twills find extensive use in the worsted industry in the production of garment fabrics, as these weaves are capable of producing compact textures. These twills are constructed by two methods 1. End and end combination 2.Pick and pick combination. In the first method the twill weaves are combined end way and in the second method twill weaves are combined in pick way. In combination with twill weaves two different types of continuous twills are combined together alternately.
Weaving is the process of making fabrics by interlacing the threads lengthwise and width wise commonly known as warp and weft in a regular order. The operation is performed in a machine called a loom. Two sets of yarns are interlaced, almost always at right angles to each other. One, called the warp, runs lengthwise in the loom; the other, called the filling, weft or woof, runs crosswise. The raising and lowering sequence of warp threads in various sequences gives many possible weave structures.
A broken twill weave composed of vertical sections which are alternately right hand and left hand in direction. In Broken Twills, twills are constructed by breaking the continuity of any continuous twill weave. They are formed by reversing the pattern part way through the repeat. The Break can be achieved in different ways.