Workshop on fabrics manufacturing technology

Workshop on

Fabrics Manufacturing Technology

Engineer Lutfor Rahman ShanzidM.Sc. In Environment (IUB)

B.Sc. In Textile (AUST)Mobile : +88 01718 33 18 [email protected]

Bangladesh

mailto:[email protected]

Wednesday, April 12, 2023 2

Contents

• Definition of different terms of Textile• Weaving sequences• Weaving motions• Weaving calculation• Knitting machines• Knit products• Knitting elements• Knit structures• Knitting calculation


Definition

• Textile• Fabric• Woven• Knit• Common error


FLOW CHART OF WEAVING Yarn (In the form of spinner’s package)

Warp Preparation Weft Preparation Winding (cone, cheese) Winding (Cop, Pirn, Cone, Cheese) Warping (Pre beam/ Warper’s beam/ back beam) Weaving (Fabric)

Sizing (weavers beam)

Drafting, Drawing, Pinning Denting, Looming

Weaving (Fabric)



yarn package

Cone Flange bobbin Cheese


WARPINGa) Direct/ high speed warpingb) Sectional warping



Sectional warping


LOOM MOTION

Primary Motion Secondary Motion Tertiary Motion

Primary motion1 Shedding: ( Tappet

(Dobby.( Jacquard.2 Picking:( Over pick

(Under pick.(Modern pick.

3 Beating:( Single( Multiple( Variable.

Secondary Motion1. Take up a) Positive b) Negative.

2. Let off a) Positive b) Negative.

(5 wheel, 7 wheel)

Tertiary Motion1 Warp stop motion2 Weft stop motion (Centre, side)3 Reed stop motion (Loose, fast)4 Temple motion (Roller, reed)5 Weft replenish


Knitting

warp weft


• Wale: Vertical column of needle loop.• Course: Horizontal row of needle loop.

Stitch Density: Wales per Inch × Course per Inch.Stitch length: Needle loop + Sinker loop

•Extended sinker loopFace loop

• Back loop

Independent Needle

Needle:

United Needle

Knitting M/C: there are three types of knitting M/C –

1. Warp knitting: Gives vertical movement of yarn.2. Weft knitting: Gives horizontal movement of yarn. 3. Other loop forming and combined M/C: Tri-axial.


Needle Carrier: Which carries needle.

Number of Feed System: The number of feeder by course.

Working Diameter: In circular knitting m/c, the distance from one needle exact to the other needle is known as working dia.

Working Width: In flat knitting m/c, the distance from first needle to the last needle is known as working width.

Gauge: Number of needle per inch.

Pitch: The distance the center from one needle to the center of another needle is known as pitch.

There Are Three Types Of Knitted Fabric1. Selvage fabric2. Cut edge fabric3. Tubular fabric


MECHANICAL PRINCIPAL OF KNITTING TECHNOLOGY

Basic Elements of Knitting1. Needle2. Sinker3. Cam

1. NEEDLE: There are various types of needle are available in market which can be divided in the following group.

a. Spring Bearded Needle b. Latch Needle c. Compound Needle




SINKER


FUNCTION OF SINKER

There are three function of sinker.1. Loop formation2. Holding down3. Knocking over

1. Loop Formation: On bearded needle weft knitting machines of straight bar frame and sinker wheel type, the loop forming action is performed. The purpose of a sinker is to kink the newly laid yarn into loop as its forward edge of advance between two adjoining needle.

2. Holding down Sinker: The second function is hold down the old loop a lower level on the needle stem, then the new loop which are being formed and prevent to old loops from being lifted as the needles rise to clear from their hooks.

3. Knocking Over Sinker: The third function of the sinker is to knock over the old loops on the neck of the new loops.


CAM

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.

The knitting cams are divided in to three groups. Such as1. Knit cam2. Tuck cam3. Miss cam


PRIMARY BASIC STRUCTURES

Knitting Fabric Structure1.Plain structure2.Rib structure3.Interlock structure4.Purl structure


Knit calculation• A Single jersey Circular knitting machine, having dia of 30

“, 24 Gauge, 30 RPM, 3 Feeder/inch and yarn count is 26s. Efficiency is 90%. Calculate the production per day in kg?

• • Solution:• Here,• Total no. of Feeder = Feeder per inch × Machine Dia• Total no. of needle= DG𝜋• SL=2.2 mm• So,• =


Thanks to all

Business

Workshop on fabrics manufacturing technology