3. 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)
4. 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.
5. 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.
6. 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 machinesEngland
became 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
7. 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
8. 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
Productionrate(Kg/hour)
Diameter of cylinder (inch)
9. 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
Productionrate(Kg/hour)
Needle gauge
10. 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
Productionrate(kg/hour)
Stitch length(mm)
11. 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
Productionrate(Kg/hour)
Number of feeder
12. 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
13. Needle linear speed
Needle linear speed =
𝜋×𝐷×𝑅𝑃𝑀×60
36×1.09×1000
km/hour
For a constant RPM,
Needle linear speed ∞ Diameter of cylinder
14. 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
Needlespeed(km/hour)
Diameter (inch)
16. 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
17. 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
18. 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
19. 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
20. 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
23. 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
26. 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
27. 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
28. Conventional and high speed knitting machine needle
Longer latch height (5mm) Shorter latch height(3mm)
29. Relanit Technology
Technology 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
