BANLADESH UNIVERSITY OF TEXTILES92, SHAHID TAJUDDIN AHMED SARANI

TEJGAON INDUSTRIAL AREA, DHAKA-1208

Welcome to our presentationOn Project Work

Project Title:

Comparative analysis between conventional knitting and Relanit knitting machine system

SUPERVISING TEACHER

MD. EMDAD SARKER

Assistant Professor,

Department of Fabric Engineering,

Bangladesh University of Textiles

SUBMITTED BY

SAYEED IBNE REZA (2011-1-081)

MD. FAKHRUL ISLAM (2011-1-086)

YEASIN ARAFAT (2011-1-232)

MONIKA JAHAN (2011-1-250)

Objectives

1. Comparison between conventional knitting machine and high speed

knitting machine

2. Analyzing the recent development of knitting machine

3. Analyzing the way of increasing production rate by changing knitting

parameter without affecting on fabric properties.

4. Analyzing the optimal cost rate of production.

4th century: Era of nalebinding. It is an ancient craft which involves creating fabric done with a needle made of wood or bone.

13th Century: Knitted cushions have been found in tombs dating from the thirteenth century in Spain

14th Century: hand knitting was popular in Europe.

16th Century: In 1589, William Lee, a clergyman, invented the first knitting machine, which knit 8 loops to 1 inch of width . Another after 9 years that could knit 20 loops per inch for silk stocking.

17th and 18th Centuries: the art of knitting was gradually taken over by guildorganized cottage industries

19th Century: power was applied to the knitting machines and subsequently, circularknitting machines appeared on the scene.

20th Century: Seamless stockings were knitted on circular machinesEnglandbecame famous for its stockings later on, knitted pullovers, cardigans, shirts, men's underwear, sportswear, and swimwear also became popular

21st Century: increase in the production speeds of knitting machines and offered a wider choice to pattern the knitted fabricsNow, computer controlled knitting machines have entered the scene, and these are highly versatileToday, knitted garments have evolved as fashionable and functional wear for men, women and kids

Factors related to production rate and fabric properties with different knitting parameter

Cylinder Diameter

Needle Gauge

Number of cam box

Number of feeder

RPM of cylinder

Linear speed of the needle

Relation between production rate and diameter

of cylinder

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20 25 30 35 40

Pro

du

ctio

n r

ate

(K

g/h

ou

r)

Diameter of cylinder (inch)

Relation between production rate with needle

gauge

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20 25 30

Pro

du

ctio

n r

ate

(K

g/h

ou

r)

Needle gauge

Relation of production rate with stitch length

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 0.5 1 1.5 2 2.5 3

Pro

du

ctio

n r

ate

(k

g/h

ou

r)

Stitch length(mm)

Relation between production rate and Number of

feeder

0

1

2

3

4

5

6

7

8

9

0 20 40 60 80 100 120 140 160

Pro

du

ctio

n r

ate

(Kg

/ho

ur)

Number of feeder

Effect on fabric due to changing different knitting

parameter

Knitting Parameter Effect on fabric

Increasing Cylinder diameter Larger Fabric width

Increasing gauge of needle More wales per inch

Increasing Stitch Length Less GSM of the fabric

Increasing Number of feeder Increase negligible spirality

Needle linear speed

Needle linear speed = 𝜋×𝐷×𝑅𝑃𝑀×6036×1.09×1000

km/hour

For a constant RPM,

Needle linear speed ∞ Diameter of cylinder

Relation of Needle linear speed with Diameter of cylinder

0

1

2

3

4

5

6

0 5 10 15 20 25 30 35 40

Nee

dle

spee

d (

km

/hour)

Diameter (inch)

Diameter (inch) RPM Speed Factor

(SF)

Cylinder

Tangential Speed

(m/s)

30 20 600 0.8

30 22.5 675 0.9

30 25 750 1.0

30 27.5 825 1.1

30 30 900 1.2

30 32.5 975 1.3

30 35 1050 1.4

30 37.5 1125 1.5

Cylinder tangential speed for same diameter of cylinder

So, For increasing the production rate without affecting

fabric properties it should be concern into :

Increasing the number of feeder as well as

number of cam box.

Increasing the cylinder RPM

Brand name: Terrot

Latch height of needle: 3.0 mm

Distance between pivot of latch &

vertex of needle: 3.5 mm

Cam width=25 mm

Cam profile width=5 mm

Knit cam clearing height = 13 mm

Tuck height = 9 mm

Brand name: Jiahas(Basushuo)

Latch height of needle = 3.5 mm

Distance between pivot of latch & vertex of needle = 4.00 mm

Cam width = 25 mm

Cam profile width = 6 mm

Knit cam clearing height = 13 mm

Tuck height = 9 mm

Brand name: Orizio

Latch height of needle = 4.00 mm

Distance between pivot of latch & vertex of needle = 4.40 mm

Cam width = 25 mm

Cam profile width = 6 mm

Knit cam clearing height = 14 mm

Tuck height = 10 mm

Brand name: Lisky

Latch height of needle = 3.00 mm

Distance between pivot of latch & vertex of needle = 4.00 mm

Cam width = 25 mm

Cam profile width = 6 mm

Knit cam clearing height = 13 mm

Analysis of Normal knit cam structure

Cam height and width

Problems occur when the cam width is decreased

after a certain height

Larger Cam angle

Needle butt gets strike on the point of cam

descends after ascending

Need more vertical movement of needle causes

more friction

Ultimate cam design for increasing production

Cam designed for higher RPM

Modified high speed knit cam

Number of cam box in a 30 diameter cylinder machine

When Cam width 26 mm,

Circumference of cylinder

= 2393.89 mm

Number of cam box can be

held = 2393.89/26 = 92.07≅92

When Cam width 20 mm,

Circumference of cylinder

= 2393.89 mm

Number of cam box can be

held = 2393.89/20 = 119. 𝟔𝟗𝟒 ≅ 119

Limitations of this cam

Less clearing height

Needle latch height should be less

Tuck height is so less that tuck loop

formation is quite difficult

More heat generation due to higher RPM

Conventional and high speed knitting machine needle

Longer latch height (5mm) Shorter latch height(3mm)

Relanit TechnologyTechnology of using vertical sinker in circular knitting machine is called Relanit technology. It is a modern innovation of MAYER & Cie.

Relanit Versions:

Relanit 1.6R

Relanit 1.6ER

Relanit 2 SE

Relanit 3.2 ii

Relanit 4.0

Diameter of cylinder = Number of feeder / Relanit model

Relanit 4.0 (High speed machine)Higher number of feeder ,Special types needle & cam ,Vertical sinker

Needle Cam Vertical Sinker

Brand Origin Diameter Gauge Number of

feeder

Number of

needle

Mayer & Cie Germany 30 24 96 2260

Pai-lung Taiwan 30 24 90 2262

Orizio Italy 30 24 96 2220

Jiunn Long Taiwan 30 24 90 2256

Fukuhara Japan 30 24 98 2268

Keum yong Korea 30 24 90 2256

Pai-lung Taiwan 34 24 102 2564

Keum yong Korea 34 24 102 2564

Jiunn Long Taiwan 34 24 102 2544

Fukuhara Japan 34 24 102 2564

Jiunn Long Taiwan 36 24 108 2712

Jiunn Long Taiwan 36 24 120 2715

Pai-lung Taiwan 36 24 108 2715

Fukuhara Japan 36 24 118 2712

Mayer & Cie Germany 36 24 114 2712

Mayer & Cie

(Relanit 4)

Germany 36 24 144 2724

Number of needle and cam boxes for the certain diameter of the cylinder

References

(1) https://en.wikipedia.org/wiki/history_of_knitting

(2) Knitting department, Padma poly cotton Ltd. Tejgaon industrial

area, Dhaka-1208

(3) Knitting section,Square fashions Ltd. Valuka, Mymensingh.(4) Mayer & Cie: www.mayerandcie.com

(5) Groz-beckert: www.grozbeckert.com/cms/products_services/knitting

(6) Garments tech: www.garmentstech.com

(7) Unitex: www.unitex.com.sg/single_knit_striper.html

Thank You