Drawing and texturising

-Drawing is very important process of spinning.-This process is used to increase the orientation of polymer molecules..  High degree of orientation of polymer molecules that tends to

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 Banglade sh

Prepared By :

Total Textile Process at a Glance

Errors in Drawing.

Texturising.

Drawing

What is texturising?Drawing machine

Purpose of texturising.Steps of texturising

Texturising methods

Conclusion

-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

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

To produce fibres with the specific properties desired.

To increase the crystalline zone in fibres

in the input sample, and poaolo be the mass after drawing It follows that;

piaili ≈ poaoloAnd if the packing density is constant

pili ≈ poloFor the purely theoretical case, the change in cross sectional area is inversely proportional to the change in length This is 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

Molecular orientation during drawing

A typical two-stage drawing process:

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:

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 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

 Draw frame: high speed draw frame

 Delivery number: 2 holes

 Maxmium output speed: 600m/min

 Total drafting mutiple: 5-14 times

 Drafting style: 5 over 4 with pressure bar

 Feeding sliver number: 6-8 pcs

 Mainframe OAD: 2790*950*1645mm

 Weight: 2200kg

 Motor power: 4.0kw

 The more closely the molecules pack together, the greater is the ultimate strength, or breaking strength, of the fibre.

 This increase in ultimate strength is accompanied by a decrease in the amount of elongation that the fibre can sustain before reaching its breaking point

 Because the closely packed molecules no longer have great freedom of movement , a high degree of orientation also tend to increase fibre stiffness and rigidity

 Increased resistance to penetration by foreign molecules also improves the general chemical stability of a fibre, since highly oriented fibres are more resistant to chemical attack

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 suitable for texturing The prime purpose of texturing filament yarn is to create a bulky structure

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The process of introducing crimp, loop, coils to continuous filament yarn is called Texturizing It

stabilizes the POY through heating and drawing

Two types of manmade POY can be textured-

 Nylon (Used in manufacturing of ladies

hosiery)

 Polyester (Used in apparel & home furnishing)

TEXTURIZING

Some Texturizing Process

- Introduce mechanically by passing the filament

between gear like rollers.

- Produced chemically by controlling coagulation of a filament in order to create asymmetric cross-section

in the fibre.

-The twist geometry is set by cooling the yarn

in a

highly twisted state.

-This process is applied with drawing process -False-twist is applied for Nylon and Polyester.

False-twisting

Crimping

- Introduced crimp are like as the shape of knitted loop

- Yarn is knitted into tubular fabric

- Then unraveled to produced textured yarn

-This method is used with a single type of yarn or with

a blend of filament yarns

-It is carried out by feeding a wet yarn or a dry yarn

Plus a small amount of water into a high-speed jet of

air.

-Yarns textured in such a process contain a large

number of very fine filaments

Air jet Knit-deknitting

The disorganized (or less organized) surface of the yarn gives dispersed light reflections, which, in turn, give a desirable matte appearance.

The sponge like structure feels softer than a lean twisted flat yarn The crimped or coiled filament structure gives a lower effective modulus of elasticity to the structure when compare with that of a flat yarn

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Steps of texturising:

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Deform the filament.

Set the deformation.

Remove the deformation.

Knit de knit Air jet Texturising

Stuffer box Gear crimping Edge crimping method Texturising by co-extrusion

1 Real twist Texturising:

2 False twist Texturising:

a) Sequential,

b)Simultaneous.

Draw Texturing Machine

4 Air jet Texturising:

is the taslam process;

Air jet textured yarn.

8.Edge crimping method:

to curl or otherwise texture in the manner

of a bi-component yarn The second is to make the stripes have little or no bonding, in which case the filament can

be decomposed into a series of finer ones

Schematic longitudinal view of textured yarns

Among the various properties, generally assessed with methods similar to those used for other types of yarn, there is a method of particular importance and for specific use, termed crimp contraction (or crimp elasticity).This property is essentially assessed on false-twist yarns and is defined as “the contraction of a textured yarn due to crimp development, expressed as percentage rate of the stretched out (not crimped) yarn length”

Properties of textured yarns:

Difference between texturising methods:

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What type of yarns can be textured:

Nylon and polypropylene

Polyester yarns are normally in the range between 50 and 300 den, with the emphasis on 75 and 150 den

Nylon yarns are in the range from 15-110 den,

The majority of fine hosiery yarns being 20 den and coarser yarns being

70 den

Textured effect:

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1 Yarn Manufacturing Technology

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