Effect of finishing on Knit Fabrics

 Finishing process improves the physical properties of fabric like feel, softness, tensile strength, elongation, G.S.M, dia, shrinkage, spirality, twisting, and insulation properties...

Trang 1

Effect of finishing on Knit Fabrics

Effect of finishing on Knit Fabrics 1

Trang 2

 Textile finishing is a term commonly applied to different

processes that the textile materials undergo after pretreatments, dyeing or printing for final embellishments to enhance their attractiveness and sale apparels well as for comfort and usefulness

 Finishing process improves the physical properties of fabric like feel, softness, tensile strength, elongation, G.S.M, dia, shrinkage, spirality, twisting, and insulation properties

Dhaka,15.05.2011 Effect of finishing on Knit Fabrics 2

Trang 3

on the following:

• Nature of the fabric, i.e chemical composition, state, weave,

etc This determines the appearance, i.e transparences, luster, fullness, weight, whiteness, etc

• The physical properties of the fabric, i.e feel, softness,

stiffness, tensile strength, elongation, shrinkage property, insulation etc

• The end-use of the material i.e non-shrinking, non-creasing,

stiffening etc

• Receptivity of the fabric to various finishing operations, i.e

water-proofing, flame-proofing, rot-proofing etc

• Susceptibility to chemical modifications.

Trang 4

Finishing treatments are basically

meant to give the textile material

certain desirable properties like:

Trang 6

Classification of Finishes

•Aesthetic finishes:

•Functional finishes

•Mechanical finishes (Dry finishes)

•Chemical finishes (Wet finishes)

Trang 7

Finishes can also be classified by their degree of

Trang 8

Controling parameter of finishing

• Dia of the fabric

• GSM of the fabric

• Shrinkage of the fabric

• Weight loss or gain

• Tension control

• Temparature of different stage

• Spirality control etc.

• Color fastness of the fabric etc.

Trang 9

Dhaka,15.05.2011 Effect of finishing on Knit Fabrics

.

9

Trang 10

Finishing process

Trang 12

Formula of shrinkage % measurement:

.

Finishing terms

−

= Before Wash Length After Wash Length ×

Length Wise Shrinkage % 100

Before Wash Length

−

= Before Wash Width After Wash Width ×

Width Wise Shrinkage % 100

Before Wash Width

Trang 14

Finishing terms

Color fastness:

The stability of color or its fastness is one of the

customers Colour fastness of dyed goods means the resistance power of dyed goods against any hazards.

The color textiles show different resistance power to different agencies such as light, wash, rubbing, perspiration, water, bleach, acid, alkali etc

.

14

Trang 15

 If water remove from fabric is very much percentage than fabric surface show crease mark, this fault can’t be remove.

 If length wise run the fabric then 20% shrinkage occurs

 If breakdown occur of de-twister than puckering occurs

 If twist problem occur than it effect on knit garments

 If do not take proper ballooning than folding mark occurs

.

15

Trang 16

Effect of Hydro and Dewatering

 If squeeze roller/padder pressure is high than fabric surface show pressure mark

 If over feed dia of delivery side is not perfect than length

wise shrinkage occurs

 If dia increase than become poor shrinkage properties

 Dia increase in this stage because it helps to better work for dryer & slitting

 Dia mark also occurs in this stage

.

16

Trang 17

Effect of slitting

and if dia is greater than basket than GSM problem occurs.

.

17

Trang 18

Effect of Stentering

 Over feed tension is very important for this stage

 If over feed decrease than length increase

 More over feed give in white fabric

 If need light shade of the fabric than increase padder

pressure

 If need dark shade of the fabric than temperature increase 20˚C

 For Lycra heat setting temperature need (190-200) ˚C

 If half feeder Lycra fabric than increase speed and decrease temp

 If full feeder Lycra fabric temp need 200˚C

 Heat setting takes for width fixed of Lycra fabric

.

18

Trang 19

Effect of Compacting

Many textile manufacturers have, and still do, rely on compaction as a means of shrinkage control Compaction is a method whereby the course loops are compressed upon themselves Different machines incorporate a variety of techniques to accomplish this There are basically two classifications of compaction: heated rolls and shoe units or belt shrinking units Both methods rely on speed differential and their patented compaction zones to accomplish the compaction Tubular and open-width systems are available The fabric is steamed to add moisture and then introduced to the compacting zone The compaction mechanism, along with heat and moisture, forces the length stitches (courses) to be compacted

.

19

Trang 20

Results and discussion

.

20

For finding the effect of finishing on knit fabric some experiment are done on different types of knit fabric.

Trang 21

and single jersey lycra fabric

.

GSM

Trang 22

Compare the Variation of GSM for 1×1 rib

fabric and Interlock fabric

Trang 23

fabric and Pique

GSM

Trang 24

Compare the shrinkage % change for Single

jersey and single jersey lycra fabric

Width%

Length%

Trang 25

rib fabric and Interlock fabric

Length%

Width%

Trang 26

Compare the shrinkage % of fleece

fabric and Pique

length%

width%

Trang 27

single jersey lycra fabric

Trang 28

Spirality % change for 1×1 rib fabric

and Interlock fabric

Spirality%

Trang 29

Dyeing Slitting Stentering Compacting

spirality%

Trang 30

Trang 31

• http://www.thesmarttime.com

• Books of Finishing ,By-Petro Bellini,Ferruccio Bonetti

• Lecture sheet of Dr Zulhash Uddin

• Experimental data from Paddma poly cotton knit fabrics

Ltd

Trang 32

Acknowledgement

We would like to express many thanks to our

very good opportunity for presenting ourselves We also thanks our parents who encouraged us every step of our life Lastly thanks all of you who are give kind attention for this presentation ceremony

Trang 33

Thank you ALL for your Attention

Định dạng
Số trang	34
Dung lượng	1,62 MB