FABRIC Manufacturing TECHNOLOGY www.AssignmentPoint.com

Types of FABRIC Fabrics are mainly two types- Woven Fabric. Knitted fabric. www.AssignmentPoint.com

Comparison of WOVEN FABRIC vs KNITTED FABRIC It is the made by interlacement of yarn It is the interlooping of yarn Different looms are used. Different knitting m/cs are used. No need of needle Needle is needed. Lengthwise & widthwise directions are named as warp & weft respectively. Lengthwise & widthwise directions are named as Wales & course respectively. www.AssignmentPoint.com

WOVEN FABRIC & KNITTED FABRIC www.AssignmentPoint.com

Woven Fabric & Knitted Fabric www.AssignmentPoint.com

Difference between woven and knitted fabrics Construction Woven fabric is at least made up of two separate groups of yarns (warp and weft) and knitted fabric can be made up of one yarn only. Weaving is interlacing of 2 set of yarn to form a fabric. Knitting is a process of converting yarn to fabric by forming a series of loops dependent on each other. www.AssignmentPoint.com

Difference between woven and knitted fabrics Elasticity Elasticity is the ability of the fabric to extend and recover to its original shape and length. Knitted fabric has higher extensibility and instant recovery ability than woven fabric. www.AssignmentPoint.com

Difference between woven and knitted fabrics Fabric Density and Cover In general, woven fabric can be produced in extremely tight and higher coverage when compared with knitted fabric. Range of density variation is much higher than knitted fabric. Knitted fabric in general, is looser in structure. www.AssignmentPoint.com

www.AssignmentPoint.com

Difference between woven and knitted fabrics Thickness and Handle Knitted fabric is much thicker and softer than woven fabric as it has a complicated 3-dimensional structure. Knitted fabric seems to be softer because the knitted loops are more easily compress and extensible than straight yarn (warp and weft in woven fabric) www.AssignmentPoint.com

Difference between woven and knitted fabrics Production Cost Weaving requires expensive preparation processes like warping, sizing, draw-in; while knitting only requires yarn waxing. The production rate of circular knitting is roughly FIVE times faster than modern weaving loom. www.AssignmentPoint.com

Flow Chart For Woven Fabric Input Process Output Yarn → Winding Warping Sizing Drying Weaving Fabric www.AssignmentPoint.com www.AssignmentPoint.com

Flow Chart For Knitted fabric Input Process Output Yarn → Winding Knitting Fabric www.AssignmentPoint.com

WINDING The process of transferring yarn from ring bobbin to suitable packages is called winding. Objects of winding: To transfer yarn from one package to another which is suitable for next process. To clean yarn. To improve the quality of yarn. www.AssignmentPoint.com

Types of Packages A= Flanged bobbin. B= Cone. C= Cheese. D= Pirn. E= Cop. www.AssignmentPoint.com

Types of Winding m/c Flanged bobbin winding m/c. Cone winding m/c. Cheese winding m/c. Pirn winding m/c. Cop winding m/c. www.AssignmentPoint.com

www.AssignmentPoint.com

Common flow diagram A= Input Package. B= Guide. C= Tensioner. D= Cleaner. E= Output Package. www.AssignmentPoint.com

Types of Drive Direct Drive Indirect Drive A= Motor B= Motor pulley. C= M/c pulley. D= Package. Indirect Drive D= Cylinder. E= Package. www.AssignmentPoint.com

Auxiliary functions in winding 1. Creeling: This is the placement of full packages in position ready to be unwound as part of the transfer operation. 2. Piecing: This is the joining of two ends of yarn. It can be done by knotting or adhesion. 3. Doffing: This is the removal of the newly wound package & replace by an empty package. www.AssignmentPoint.com

WARPING The parallel winding of warp ends from many little packages to a common package (warp beam) is called Warping. Object of Warping: To arrange a suitable number of warp yarns of required length so that they can be collected from a single warp beam as a continuous sheet of yarn which can be used in weaving. www.AssignmentPoint.com

Warping & Warp beam www.AssignmentPoint.com

www.AssignmentPoint.com

SIZING Sizing is the process of applying a protective adhesive coating on the surface of yarn. Object of Sizing: To improve weavability of yarn. To maintain good fabric quality by reducing hairiness, weakness, etc. www.AssignmentPoint.com

Size Ingredients 1. Adhesive: Generally starch of maize, potato, etc are used to increase strength. 2. Lubricants: Japan wax, linseed oil, animal fats, etc are used to make the yarn slippery and smooth. 3. Antiseptics/ Anti mildews: Fatty acid, Zinc chloride, phenol, etc are used to prevent mildew formation. www.AssignmentPoint.com

Size Ingredients 4. Hygroscopic agent: Magnesium chloride, calcium chloride, etc are used to prevent excessive drying. 5. Weighting agent: China clay, Sodium phosphate, etc are used to increase the weight of yarn. 6. Antifoaming agent: Pyridine, Benzene, etc are used to prevent foam formation. www.AssignmentPoint.com

Size Box A= Size box. B= Steam pipe. C= Immersion roller. D= Squeezing roller. www.AssignmentPoint.com

Drying Different Drying procedure: Hot Air Drying. Infrared Drying. Cylinder Drying. Combined Drying. (Cylinder+ Infra red/ Hot air) www.AssignmentPoint.com

Drying A= Infra red drying. B = Hot air Drying. C = Cylinder Drying. www.AssignmentPoint.com

Weaving The process of making fabric from yarn by interlacement is called weaving. www.AssignmentPoint.com

Mechanism of Weaving (In short) Weaving is done by different types of loom. It is the interlacement of warp & weft. Warp beam supplies warp yarn. According to the design, warp yarns are uppered and lowered and the weft yarns are forced to pass between them. Then interlacement is occurred. www.AssignmentPoint.com

www.AssignmentPoint.com

www.AssignmentPoint.com

Basics of KNITTING www.AssignmentPoint.com www.AssignmentPoint.com

Knitting Technology www.AssignmentPoint.com www.AssignmentPoint.com

KNITTING Knitting is forming loops through those previously formed. This interlooping and the continuous formation of more loops into each other produces the knitted fabric structure. www.AssignmentPoint.com

www.AssignmentPoint.com

www.AssignmentPoint.com

Some Important Terminology cont.. A single wale A single course Technically Face Technically Back www.AssignmentPoint.com

a Face Face Loop Back Loop Back The upper part of the loop produced by the needle drawing the yarn is called the needle loop. needle loop The lower part of the knitted loop is technically referred as sinker loop www.AssignmentPoint.com sinker loop

www.AssignmentPoint.com

Some Important Terminology cont.. Wale(s) : Wale is predominantly vertical column of needle loops produced by same needle knitting at successive knitting cycle. Course: Course is a predominantly horizontal row of loops produced by adjacent needles during the same knitting cycle. Course Length : In weft knitting, the term ‘course length’ refers to the measurement of a straight length of yarn knitted by all or a fraction of the needles in the production of a particular course. www.AssignmentPoint.com

Some Important Terminology cont.. Gauge/ Machine Gauge : Gauge is the term used to describe the needle spacing. It can be defined as the number of needles per unit inch. The gauge is the major factor in determining the fabric density and appearance. www.AssignmentPoint.com

www.AssignmentPoint.com

Basic Knitting Elements Latch needle The needle consists of six main parts: Stem – Used to hold the course of old loops  Hook – The hook is used to catch a thread and form loops. Rivet – Holds the latch in place and allows it to pivot. Latch – The latch combines the task performed by the presser bar and the beard of the bearded needle. Butt – The butt enables the movement of the needle to be controlled by a cam mechanism.  A track raises and lowers the needle. Tail – Used to provide support to the needle www.AssignmentPoint.com www.AssignmentPoint.com

Basic Knitting Elements cont… CAMS The knitting cams are hardened steels and they are the assembly of different cam plates so that a track for butt can be arranged. Each needle movement is obtained by means of cams acting on the needle butts. www.AssignmentPoint.com

Yarn Feeding to Needle www.AssignmentPoint.com

Knitting cam: Knitting is an element which acts directly on to the butts of needles or other elements to produce individual or serial movement. Knitting cams are attached, either individually or in unit form, to a cam plate and depending upon the machine design, are fixed, exchangeable or adjustable. www.AssignmentPoint.com

Basic Knitting Elements cont… Knitting Cams/Stitches: Based on the arrangements knitting stitches are of three types as well as the cams also. There are three types of cams and as according, three types of Knitted Stitches. Knit Cam (Stitch), Tuck Cam (Stitch), Miss Cam (Stitch). www.AssignmentPoint.com

Basic Knitting Elements cont… Knit Stitch : The knit stitch is the basic stitch. It is also called the plain stitch. Knit stitch is formed when the needle carries out a complete cycle, reaching the maximum height on the looping plane. www.AssignmentPoint.com

Basic Knitting Elements cont… Tuck Stitch : A tuck stitch is formed when a knitting needle holds its old loop and then receives a new yarn. Two loops then collect in the needle hook. The previously formed knitted loop is called the held loop and the loop which joins it is a tuck loop. The tuck loop will always lie at the back of the held loop. www.AssignmentPoint.com

Basic Knitting Elements cont… Miss Stitch : A miss stitch is created when one or more knitting needles are deactivated and do not move into position to accept the yarn. The yarn simply passes by and no stitch is formed. The float will lie freely on the reverse side of the held loop, which is the technical back, and in the case of rib and interlock structures it will be inside the fabric. www.AssignmentPoint.com

Production calculation End of Slide www.AssignmentPoint.com