Types of We Ft Knitting Machines Presentation 1

8/9/2019 Types of We Ft Knitting Machines Presentation 1

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Lecture 13

Single Knit Machines (plain)


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Main Products

Single Jersey

Pique

Locast

Honey comb Pique fleece

Two thread fleece

Feed stripes


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Single Knit Machine Working

Single bed of needle

Only cylinders

Needles and sinkers

High speed Wider width

Most common

Easy to handle


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Double Knit Machines

Cylinder and Dial

Two bed of needles

No sinker

Double side knitting


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Sub types

Interlock

Rib

Double jersey (interchangeable)


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Interlock

Highly flexible fabric

Can adopt any body shape

Used for under garments

Soft hand feel


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Rib

More strength

For grip purposes

Used at neck, arm opening, waist band

Always heavier than main fabric


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Stripes

Feed stripes

Engineered stripes


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Terry

To have towel effect

Velour fabric


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Loop Knitting

Fleece

Two thread fleece

Three thread fleece


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Jacquard

Mostly double knit machines

Electronic

Mechanical


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Lecture 14

Single Knitting Machines

Single jersey

Fleece

Terry

Stripes


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Jersey Knitting

Jersey Fabric

The consistent interlooping of yarns in the jerseystitch to produces a fabric with a smooth, flat face,and a more textured, but uniform back. Jerseyfabrics may be produced on either circular or flat

weft knitting machines.

Jersey Stitch A basic stitch used in weft knitting, in which each

loop formed in the knit is identical. The jerseystitch is also called the plain, felt, or stockinetstitch.


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Single Jersey 30"/E22

Yarn: Cotton 34/1 Nm

Fabric weight: 150 g/m2

Efficiency: 85%

Speed: up to 50 rpm

Production: 204 m/h - 63.6 kg/h


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Lecture 15

Fleece Fabric

A fabric made by sheep wool, soft warm

A fabric soft , warm bulky

Generally used to:

Protection from cold Sweat absorption (sweat shirt)

Baby clothes


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Fleece ---

A fabric knitted with two types of yarn. Fine

yarn is on front side and course yarn on backside. In most of cases fine yarn is 100%

cotton while course yarn is P/C 50:50

Normal combination and fiber ratio:

30/16, 20/10, 26/12 etc

PC/C, C/PC


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Types of Fleece

Two thread fleece

Three Thread Fleece


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Two thread Fleece

Very rare

Was popular when three thread fleece werenot common

Generally not liked due to impassion of

course yarn on front side

Low quality product


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Made on single jersey machines

Maximum medium weight, since very courseyarn difficult to use

Long loop is difficult


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Cam Arrangement

On Fleece fabric.doc three needle track

machine:


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CHARACTERISTICS OF TWO

THEAD FLEECE Light to medium weight

Double impact on front side, particularly incase of different fibers

No good brushing possible due to short

length of loop


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Three Thread Fleece

Made on fleece machines

High grammage is possible( 500 GSM)

High brushing due to long loop on back side

Maximum course yarn is possible ( up to 10 count)on back side

Very common in use

Fleece machine guage is 16 or 18


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Yarn

C/PC

PC/C

30/16, 22/12/ 20/10


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Fiber Percentage

Calculation Method

Example:

Front yarn 30s

100% cotton Back yarn 16 s 50:50 P/C

Consumption ratio Front Two kgs

Back one kg


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Total consumption three kgs

Calculation: front yarn 2 kgs 100 % cotton

Back yarn 1 kg ( ½ Kg polyester and ½ kg cotton

Total Cotton consumed 2 + 0.5 =2.5 Kgs Total polyester consumed ½ kg

Ratio: cotton= 2.5/3*100= 83.33%

Polyester= 0.53*100=16.66%

Such ratio is normally called 80:20 Fleece


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Main characteristics of Three

Highly absorbent

High weight is possible

Can use entirely different yarn on both sides(

even dyed yarn)

Pattern is possible ( diagonal stripes etc)

Very common in use


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Fleece problems and their remedies

Uneven loop – control yarn supply

Loop stretch– control cam tension

Needle line on front side

Wales thickness variation on front side due tofluff contamination between the needles,

needs regular cleaning, more cleaning is

required due to course yarn


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Poor brushing–due to high TPI yarn– use low

TPI Dyeing variation due to different percentage

of yarn calculate exact % by using Skelton

test Steak problem after dyeing due to heavy

weight fabric--- use anti creasing agents in

dyeing


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High shrinkage --- use compactor or tumble

dryers


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Other types of fleece

Sherpa fleece --- brushed and washed to get

balls Polar fleece ---- loops on both sides also

brushed on both side


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Double Face loop Knitting


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Loop knits

Terry fabric to knitted terry towel

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Types of We Ft Knitting Machines Presentation 1