DRAWING & TEXTURISING Prepared By : Mazadul Hasan sheshir ID: 2010000400008 13th Batch (session 2009-2013) Department : Wet Processing Technology Email: mazadulhasan@yahoo.com Blog : www. Textilelab.blogspot.com (visit) Southeast University Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh Prepared By : Total Textile Process at a Glance CONTENTS: 8/11/15 DRAWING & TEXTURISING 4 Introduction What is Drawing? Purpose of Drawing. Principle of Drawing. Drawing process. Errors in Drawing. Texturising. Drawing. What is texturising? Drawing machine. Purpose of texturising. Steps of texturising Texturising methods. Conclusion. 8/11/15DRAWING & TEXTURISING5 Introduction With the exception of silk ,all filaments are manufactured from man-made materials. These materials, however don’t occur in fibrous in nature. They are primarily made from chemicals that must be formed and solidified into fiber form. Synthetic fibers have been developed that posses describable characteristics, such ass a high softening point to allow for ironing, high tensile strength , adequate stiffness, and describable yarn quality. In their origional state, the fiber–forming polymers are normally solids and therefore must be first converted into a liquid form to be suitable for extrusion. After extrusion there are some operation is done for complete this process and to produce a good quality of yarn. From these we will discuss about Drawing ant Texturising. -Drawing is very important process of spinning. -This process is used to increase the orientation of polymer molecules. -It produces filament with desired strength. Fig. Two Stage Drawing Process DRAWING -Drawing process increases tensile strength and hardness of filament. -It orients the polymer molecules along the filament. -Crystallinity increases due to the orientation of polymer molecules. Crystalline and Strength Fig: Change in orientation of polymer molecules  High degree of orientation of polymer molecules that tends to increase fibre stiffness.  Lower moisture absorption.  Unlimited breaking strength.  Transparency and luster.  Changed dyeing properties.  Resistance to penetration by foreign molecules. Properties Introduces by Drawing What is Drawing? 8/11/15DRAWING & TEXTURISING9 Historically , the term Drawing was used in connection with the draw frame in staple spinning. Drafting was used regarding roller drafting system in roving and ring spinning .Polymeric fibre drawing is an important industrial process. The objective behind drawing fibres is to induce molecular orientation in the fibre, thereby increasing their strength in the direction of the stretch. That is, Extension of the filaments to many times their original length. By means of this operation, the more or less randomly oriented chain molecules are aligned in the longitudinal direction and the filaments its defirutive stress-strain characteristics. Purpose of Drawing: 8/11/15DRAWING & TEXTURISING10 The prime purpose of drawing of a yarn is to a desirable quality for the following reasons: The orientation of the polymer molecules can be increased after the spinning process by a subsequent drawing process. To convert relatively week spun fibres to fibres with greater molecular orientation and the resulting greater strength. To produce a filament with a desired strength, accomplished by inducing sufficient orientation of the polymer molecules along the axial direction of the filament. To produce fibres with the specific properties desired. To increase the crystalline zone in fibres. [...]... a flat yarn Steps of texturising: Deform the filament Set the deformation Remove the deformation Texturising method: Real twist Texturising False twist Texturising Draw Texturising Air jet Texturising Knit de knit Stuffer box Gear crimping Edge crimping method Texturising by co-extrusion 1 Real twist Texturising: Hare a batch of package of yarn was then taken from the twister and placed in an autoclave...Principle of drawing: Consider a sample of the input material before and after discontinuous drawing If there were no losses in the process, the mass of the input sample would be the same as it is after drawing Let p be the packing density, a the cross sectional area , l the sample length, piaili be the mass in the input sample, and poaolo be the mass after drawing It follows that; piaili ≈ poaolo And if... orientation during drawing A typical two-stage drawing process: Bechtel at Al gave a model for a two-stage draw process in which most of the draw was provided in the first stage( between 2.2 and 2.7 draw ratio) and a relatively smaller draw (1.1-1.2) in the second stage As the number of stages is increased, it is possible to keep each free span and roller at a different temperature and induce the maximum... can be controlled by passing the yarn through a second heater Draw Texturising: As Texturising speeds rise, they approach the speed used for filament drawing and it becomes possible to contemplate a merger between the two operations There are two forms of draw texturising ; a) Sequential, b)Simultaneous Draw Texturing Machine 4 Air jet Texturising: In this method of texturing, yarns led through the turbulent...  Weight: 2200kg  Motor power: 4.0kw Impact of drawing The degree of alignment of fibre molecules affects the properties of a fibre in several way;  Fibres change in appearance as they are drawn In the undrawn stage , nylon is usually dull and opaque As the filaments are drawn and molecule orientation increase, the filaments acquire the transparency and luster  The more closely the molecules pack... undesirable patterning known as moiré or barrě , which reduces their values What is Texturising? Texturing is a procedure used to increase the volume and the elasticity of a filament fibres The essential properties of textured yarns and the products made from them are softness, fullness, a high degree of elasticity, thermal insulation and moist transporting properties All yarns which can be shaped by heat are... discontinuous drawing However ,in production The process of elongation takes place continuously wit the input and output mass flows nominally constant Thus , the formula can be restated to say that the cross sectional area is inversely proportional to the speed ratio In practice this is modified by changes in the packing density and small losses have to be taken into account , but it forms the basis of all drawing. .. temperature of the yarn was raised above Tg and then allowed to cool The product taken from the autoclave was non-twist lively or dead, but the fibre deformations were set into their newly twisted shapes To develop the bulk, it was necessary to untwist the yarns until the filament were approximately parallel and separated, and then relax them 2 False twist Texturising: Here partially oriented yarn(POY)... the number of stages is increased, it is possible to keep each free span and roller at a different temperature and induce the maximum molecular orientation in the fibre Drawing machine:  Place of Origin: Shandong China (Mainland)  Brand Name: TONGDA  Model Number: FA-316A  Type: Spinning Production Line  Spinning Method: Ring Spinning  Automatic: Yes  Condition: New  Textile machine: draw frame... wheels The resultants yarn is left with the impression of the gear wheel teeth 8.Edge crimping method: In this method of Texturising Thermoplastic filaments in a heated and stretched condition are drawn over a crimping edge and cooled EdgeCrimping machine are make align yarn 9 Texturising by co-extrusion: Co-extrusion is where two or more polymer components are extruded through the same nozzle to . Glance CONTENTS: 8/11/15 DRAWING & TEXTURISING 4 Introduction What is Drawing? Purpose of Drawing. Principle of Drawing. Drawing process. Errors in Drawing. Texturising. Drawing. What is texturising? Drawing. in the packing density and small losses have to be taken into account , but it forms the basis of all drawing. Drawing process: 8/11/1 5DRAWING & TEXTURISING1 2 The drawing process of a fibre. maximum molecular orientation in the fibre. Drawing machine: 8/11/1 5DRAWING & TEXTURISING1 4  Place of Origin: Shandong China (Mainland)  Brand Name: TONGDA  Model Number: FA-316A  Type: