FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
A SYSTEM FOR SPINNING JUTE FIBRES
WITH COTTON FIBRES;
ARVIND LIMITED., A COMPANY
INCORPORATED UNDER THE COMPANIES
ACT 1956, WHOSE ADDRESS IS NARODA
ROAD, AHMEDABAD - 380025, GUJARAT,
INDIA
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES THE
INVENTION AND THE MANNER IN WHICH
IT IS TO BE PERFORMED.
2
TECHNICAL FIELD OF THE INVENTION:
The present invention relates to a method of producing spinnable jute fibres,
systems for producing jute-cotton yarn, dyeing and weaving fabric for apparels from
the jute cotton yarns.
BACKGROUND 5 OF THE INVENTION:
Jute fibres are used for various purposes including producing fabrics, mats, and
other articles. Conventionally, jute fibres are first processed to reduce friction and
the fibres are subjected to carding and gilling. The resultant fibres are then spun to
form jute yarns of coarser grade. Generally, the fibres are mixed and softened by
10 known methods for fibriliation of the jute and to reduce the friction. However, the
fibres produced by the conventional method are coarser fibres that are hard and
stiff and hence these fibers cannot be used for manufacturing the fabrics used for
apparels as they have itching effect.
Japanese Patent JP 06-341009 discloses a process of jute fiber and processed
15 article of banana fiber where the jute is fermented, decomposed, and bleached with
water. The lignin and tannin is removed from the jute and dehydrated. The
dehydrated fiber is retreated with peroxide, sodium per-carbonate and a caustic
alkali and centrifuged. The filtrate is electrolyzed and bleached with hydrogen
peroxide and CIO2 and dehydrated repeatedly and washed with water. The jute
20 fibres are then treated with lactic acid and then dehydrated, washed with water to
obtain a single fiber. The single fibres are then opened in water by combing and
carding machine.
However, the Japanese patent discloses a jute fiber that is pure white, soft and
tough. The fibers manufactured by this process can be used only for technical
25 textiles such as carpet backing, wall covering, food grain packages, and electric
3
insulation. Further, it does not disclose a process or system for manufacturing of
the clothing.
Further, day-by-day need of the cotton or cotton like fibers are increasing as they
have soft feel and also provides a cooling effect whereas the production of the
cotton is not meeting the requirement. Moreover, it is observed 5 that cotton fibers
take time to dry and also rotten in humid atmosphere. Therefore, life of the cotton
apparels is less. As the jute has natural functional properties like anti microbial,
anti-bacterial, anti-fungal, quick wetting and quick release, there is need of a
method to produce a jute fiber which is soft, spinnable with other fibers such as
10 cotton, synthetic fibers and fabric having cotton like effect and functionality of the
jute from the jute and/or cotton as jute is cheaply available. Further to spin jute
fibers with cotton, there is need of a system for processing an intimate blend of jutecotton
fiber having proportion of the jute fibers more than cotton to produce an
intimate jute-cotton yarn as there exists a substantial linear density difference
15 between the jute and cotton.
SUMMARY OF THE INVENTION:
It is an object of the present invention to provide a soft, flexible and spinnable jute
fibers.
It is another object of the present invention to provide a simple method to produce
20 soft, flexible and spinnable jute fiber.
It is further object of the present invention to provide systems to run intimate blends
of jute and cotton fibers for producing jute-cotton yarn, dyeing and weaving fabric
from the same and apparels of jute-cotton yarn having soft feelings without itching
effect.
25 According to first embodiment of the present invention, a method for manufacturing
jute fibers includes weakening the lignin and other cementing substances by
4
chemical treatment followed by mechanical separation of spinnable fibres. Further,
the method of the present invention includes infusing chemical softeners into the
lignin structure thereby making the fiber body more flexible and soft, resulting in
soft, flexible and spinnable jute fibres.
The method for producing jute fibers includes the steps of scouring 5 raw jutes for
improving absorbency and fibrillation; bleaching scoured jute for improving
fibrillation and whiteness of the fibrillated jute fiber, which is followed by reductive
treatment, neutralization. Then treating the bleached scoured fibrillated jute with the
surface softener for 30 to 60 minutes, hydro extracting and drying of the fibrillated
10 jute; opening the fibers from the fibrillated jute to separate jute fibers. Then water
emulsion of surface and internal softeners are sprayed on the jute fibres; and
steaming the sprayed jute fibres in a steam chamber thereby producing soft,
flexible and spinnable fine jute fibres.
According to the present invention, the raw jutes are caddies i.e. waste jute from
15 the jute spinning mills or jute reeds free from roots and barks.
In second embodiment, the present invention provides a system for processing the
staple jute fibers produced by the first embodiment of the present invention with
cotton fibers to manufacture jute-cotton yarn. The system according to this
embodiment comprises a mixing section for mixing staple jute fibers and cotton
20 fibers in a predetermined proportion wherein jute fibers and cotton fibers are
stacked in alternate layers to form a sandwich stack of the fibers, cut vertically and
tumbled to obtain homogeneous mixture of the jute and cotton fibers; a blowing
section which includes a bale breaker/blender, fiber opener, fiber mixer, fine fiber
opener and optionally lap former for cleaning the mixed jute-cotton fibers; a carding
25 section which retains longer fiber by removing the small fibers from the mixture of
fibers along with fining of the fibers and produces jute-cotton sliver of the mixed
5
fibers; a drawing section which blends, draws and parallelizes the jute-cotton fibers
in the sliver; a drafting section which drafts the sliver to form a roving along with a
twist; a spinning section which further drafts at least one jute-cotton roving forming
a jute-cotton yarn and winds the jute-cotton yarn on a bobbin; and a yarn
conditioning section which conditions the jute-cotton yarns with dry 5 saturated steam
at 90 degree C for 2 hours by allowing soaking of moisture and releasing the
stresses developed in the jute-cotton yarn due to the twist.
In third embodiment, the present invention provides a jute-cotton yarn spun from
the predetermined mixture of the cotton fibers and staple jute fibers produced by
10 the method of the first embodiment of the present invention having a feeling and
flexibility like a cotton yarn, and functionality of the jute fibers.
In forth embodiment the present invention provides a system for dyeing the jutecotton
yarn of the third embodiment manufactured by the spinning system of the
third embodiment of the present invention. The dyeing system comprises a warping
15 section, which warps jute-cotton yarn at a creel tension of 35-45 gm/end of the jutecotton
yarn with a guide distance of 150-300 mm at a linear speed of 250-450
m/min on beams to prepare warped beams; a dyeing section which dyes warp
sheet prepared by combining individual sheet from the predetermined number of
the warped beams by initially reducing tension in the dry jute-cotton yarn sheet to
20 20-30 gm per end of the jute-cotton yarns in the sheet and then increasing tension
to 60-85 gm per end of the jute-cotton yarn in the warp sheet in wet condition as the
warp sheet of the jute-cotton yarns passed through the pretreatment tanks and then
through the dyeing tanks, and then dries the dyed sheet of the jute-cotton yarns;
and a sizing section which includes at least two dips and squeeze nips and has a
25 paste having viscosity of the paste is adapted between 5-6 seconds along with 6-
8% (w/w) solid content for improving penetration of the paste in the jute cotton
6
yarns without stiffening of the jute-cotton yarns in the sheet; and a drying section
followed to the sizing section for drying the dyed and sized jute-cotton yarns having
12-14% residual moisture content before winding on a weaver’s beam.
In fifth embodiment, the present invention provides a weaving system for
manufacturing a fabric from the jute-cotton yarns of the third 5 embodiment of the
present invention produced by the second embodiment of the present invention or
the dyed jute-cotton yarns produced by the system of the forth embodiment of the
invention. The weaving system comprises an air jet loom having a shed height
between 68-75 mm with gradual increase and decrease of shedding tension by
10 staggering of heald frames about 8-10 mm and 0.5 bar air pressure of weft yarn
cutter for interlacing warps and weft of the jute-cotton yarns to form a fabric. The
tension in the warp is maintained between 50-70gm/yarn and the air jet loom is run
at a lower speed such as 500-560 rpm to produce a fabric.
The sixth embodiment of the present invention provides a fabric woven from the
15 jute cotton fibers manufactured by the system of the fifth embodiment of the present
invention.
The seventh embodiment of the present invention is a garment stitched from the
fabric of the sixth embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
20 The above and other objects and features of the present invention will become
apparent from the following description of the preferred embodiments given in
conjunction with the accompanying drawings, in which:
Fig 1 shows a flow chart of a method for producing spinnable jute fibers from
caddies;
25 Fig 2 shows a flow chart of a method for producing spinnable jute fibers from jute
reeds;
7
Fig 3 shows a schematic view of the spinning system for processing jute-cotton
fibers to produce a jute-cotton yarn;
Fig 4 shows a schematic view of a system for dyeing jute-cotton yarns;
Fig 5 shows a schematic view of a system for manufacturing fabric;
Fig 6 shows a draw frame of the drawing 5 machine in which:
Fig 6A shows a Normal draw frame;
Fig 6B shows a draw frame modified according to the present invention.
DETAILED DESCRIPTION OF THE PRESENT INVENTION:
According to the present invention Fig 1 and 2 show flow charts for a method for
10 manufacturing of the soft, flexible jute fibers and Fig 3-5 show systems for
processing jute fibers and cotton fibers to manufacture jute-cotton fabric of the jutecotton
yarn and Fig 6 shows a cotton carding machine.
Fig 2 depicts a method to produce a jute fiber from the jute reeds, which should be
free from the roots and barks according to the present invention.
15 According to the present invention, as shown in Fig 1 and 2 the method includes
the steps of scouring of raw jutes in a tank, bleaching the scoured jute for whitening
and fibriliation, followed by reductive treatment, neutralization, then treating the
fibrillated jute with surface softeners, hydro-extracting, and drying the fibrillated jute.
The dried bleached fibrillated jute are opened by opening machines and then
20 softened by spraying water emulsion of surface softeners for smoothening and
internal softeners for softening and improving flexibility of the jute fibers and
steamed.
As per the present invention, the scouring of the raw jute is carried out at 120-180
degree C at 2.5 - 4 bar pressure for 2-4 hours with 3 to 6 gm/lit caustic soda. The
25 scouring of the jute depends upon the types of the raw jute. The scouring improves
absorbency and help in the fibrillation of the jute.
8
As per the invention, the bleaching of the jute may be carried out in a way known to
a person skilled in the art such as for example open vat or High Temperature High
Pressure (HTHP) dyeing vessel. Preferably, HTHP dyeing vessel may be
employed for bleaching as vat may be time consuming and requires more
manpower. The bleaching agents employed in the present invention 5 include but
not limited to hydrogen peroxide, 3-4% w/w sodium meta silicate (SMS), tri sodium
phosphate (TSP) and the like. The bleaching process further fibrillates the scoured
jute and improves the whiteness of the fibrillated jute.
In reductive treatment as per the invention, the bleached fibrillated jute is treated
10 with 2.5% sodium sulphide for at least 1 hour at 90 deg C. The reductive treatment
improves flexibility and softness of the jute fibers. According to the present
invention, the scouring treatment to the reductive treatment can be carried out in a
single chamber.
After reductive treatment, the fibrillated jute is washed with hot water at 60 deg C
15 for 20 min followed by cold washing of the fibrillated jutes with acetic acid for
neutralization.
As per the present invention, the hydro extracting is carried out for extracting water
in order to dry the jute fiber fast. Further, the jute fibers may be dried naturally or by
using a dryer at around 95 deg C.
20 As per the present invention, the raw jutes can be caddies i.e. waste from the jute
industries or jute reeds free of roots and barks.
As per the invention, the opener machines as shown in Fig 1 used for the fibrillated
jute of the caddies are the teaser card and cotton card. The fibrillated jute is passed
through the teaser card first and then through the cotton card, which produces
25 staple jute fibers generally having a length of 30mm-140mm.
9
As per the invention, the opening machines as shown in the Fig 2 used for
separation of the jute fibers from the fibrillated jute of the jute reeds comprises card
machines, gilling machines, a cutter machines to produce a staple jute fibers of
required size followed and a cotton card to produce a jute sliver. According to the
present invention, the fibrillated jute is passed through 5 the breaker card,
intermediate card and finisher card for carding. It is suggested by the present
invention that the breaking card having a lower pin density and a finisher card
having a higher pin density may preferably be used for separating the jute reed i.e.
pin density to be increased from the breaker card to finisher card for splitting of the
10 fibers without substantial reduction in the length of the jute fibers. It is also
suggested by the present invention that the finisher card may be fitted with one
drawing head that delivers laps of jute fibers with crimps and the laps are then
gilled. The gilling process may include gilling of the sliver in three steps including
breaker gilling, intermediate gilling and finisher gilling for improving blending and to
15 obtain fine jute fibers. The gilled jute fibers are converted in the staple fibers having
a length of 30mm-140mm and further passed through the cotton card to produce
jute sliver before the next treatment of the fibers.
According to the present invention, the surface softener is sprayed over the staple
jute fibers for smoothening is selected from PNLITM, Sarasoft1371TM, PEG400TM
20 and internal softener is a CERAPAM-MWTM. Then the sprayed staple fibers are
subjected to the wet steam at 95 deg C for 90 min in a steam chamber.
Alternatively, the long jute fibers without cutting can be subjected to steam by
spraying softeners. After steaming the jute fibers are unload from the steam
chamber and packed. The jute fiber obtained using the method of the present
25 invention is soft, flexible and spinnable with finer count. Further, these fibers have
10
properties to be mixed with other fibers like cotton, synthetic fibers for
manufacturing the fabric for apparel.
The present invention further provides systems for processing the jute fibers
produced by the above method with the cotton fibers to manufacture jute cotton
yarn, dyed jute-cotton yarn and fabric from the same. The systems 5 are shown in Fig
3-5.
Fig 3 depicts a system for spinning jute fibers with cotton fibers (100) (herein after
referred to as spinning system) to manufacture a jute-cotton yarn (190). The
spinning system (100) comprises a mixing section (110), a blowing section (120), a
10 carding section (130), a drawing section (140), a roving section (150), a spinning
section (160), a yarn conditioning section (180) and optionally winding section
(170).
In the mixing section as per the present invention, staple jute fibers and cotton
fibers in a predetermined proportion are stacked manually in alternate layers to
15 form a sandwich stack of the jute cotton fibers, then cut vertically and tumbled to
obtain homogeneous mixture of the fibers.
According to the present invention, the blowing section (120) includes a bale
breaker/blender (121), a fiber opener (122), a fiber mixer (123), a fine fiber opener
(124) and optionally lap former (125) to deliver the mixed jute-cotton fibers in lap
20 form (126). For running the blend of the jute-cotton fibers, the speed of the opening
rollers (not shown) is reduced to 400 – 500 rpm along with grid bars (not shown)
are adjusted to minimum opening angle. Generally the lap has 390-400 gm/yard.
Alternatively, the mixed jute-cotton fibers (127) from the blowing section (120) can
be fed directly to the carding section (130) for carding. The blowing section (120)
25 cleans and blends the mixed jute-cotton fibers (127) to obtain uniform mixture of the
jute and cotton fibers.
11
As per the present invention, the carding section (130) includes a cotton carding
machine (135) having an aerodynamic plate (not shown) adapted below the lickerin
(131) and wire points (not shown) provided on at least 4 flats (133) directed
reversed after at least 1 flat having regular wire points direction. The cotton card
(135) produces a sliver (132) of jute –cotton fibres from the lap 5 (126) of the jutecotton
fibers by carding and retaining longer fibers of jute along with cotton fibers in
the jute-cotton sliver (132) and removes mainly small fibers (not shown) of jute and
cotton from the mixture of jute-cotton fibers along with fining of the jute fibers and
delivers the carded jute-cotton sliver (132) in a can (134). Generally, the cotton card
10 machine (400) is set in such a way that it delivers jute-cotton sliver (132) having
count of Ne 0.13-0.15 and the small fibers having length 12 mm are removed at the
carding section for spinning purpose.
As per the invention, the drawing section (140) further blends one or more carded
jute-cotton slivers (132), draws and parallelizes the jute-cotton fibers (not shown) in
15 the jute-cotton sliver (142) and delivers in a can (144). For best result, the present
invention for smooth running of the drawing machine in drawing section (140)
suggests a closest possible distance between the rollers of front drafting zone (A)
of 36-38 mm, back drafting zone (B) of 40-44 mm along with lower break draft of
1.36-1.40. Further, speed of the drawing machine (145) is reduced to 150-175
20 meter/min, as the jute-cotton web is weak as compare to the cotton fibers web.
Further, a passage of the drawing machine from drawing rollers (147) to the
trumpet (148) as shown in Fig 6B at the delivery side is kept empty by removing
components such as condenser (141) and transport tube (143) of normal draw
frame of the drawing machine as shown in Fig 6A for supplying drafted jute-cotton
25 fibers directly to trumpet of the drawing machine (145) to form a jute-cotton sliver
(142).
12
As per the present invention, the roving section (150) further drafts the jute-cotton
sliver (142) inducing a twist in the sliver to form a roving (152) and winds the jute –
cotton roving (152) on a bobbin (154). Here the present invention for smooth
drafting of the jute-cotton sliver (142) over a roving machine (155) suggests 45-
47mm distance between rollers of the front drafting zone (X), 5 50-52 mm distance
between the rollers of the back drafting zone (Y) along with a lower break draft of
1.05-1.1. Further, the present invention suggests higher level of twist multiplier of
2.0-2.5 for a roving hank of 0.8-1.2. Further, lower spindle speed of the drafting
machine is kept between 600-800 rpm, as the jute-cotton roving is weak as
10 compare to the cotton roving.
As per the present invention, the spinning section (160) comprises a ring-spinning
machine (165), which further drafts at least one jute-cotton roving (152) and
induces twist in the jute-cotton roving (152) forming a jute-cotton yarn (190) and
wound the jute-cotton yarn (190) on a bobbin (164). The ring-spinning machine
15 (165) for running the jute-cotton roving (152) comprises only main drafting zone (Z)
with an apron (166) adapted on the rollers (168) of the drafting zone (Z). For better
yarn uniformity and strength of the yarn, the present invention suggests smaller
spacer size (not shown) along with higher twist multiplier of 5.8-7.4 depending upon
yarn count and application like weaving or knitting. Preferably, two roving are
20 blended together and drafted to improve the yarn evenness. The lower spindle
speed (not shown) of ring spinning machine is reduced to 6000-8000 rpm for
smooth running of the jute-cotton roving (152) along with faster ring rail speed of 3-
4.5 m of yarn/ stroke. The jute-cotton yarn (190) has count Ne 5.3/1 – 20/1.
In the winding section (170) as per the present invention, the jute-cotton yarns
25 (190) from bobbins (164) are transferred to packages (174). The winding helps to
remove the unwanted faults such as short, thick, long thick, long thin bad yarn
13
joints, fault clusters, off counts etc. in the jute-cotton yarns (190) and joins the ends
of the yarns to transfer into package (174). For better uniformity in the jute-cotton
yarn (190), the winding speed is reduced and maintained between 750-900 m/min
along with 25-50 gm tension in the jute-cotton yarn (190) while winding. Further,
yarn path is kept as free as possible to avoid surface damage 5 of the jute-cotton
yarn (190).
As per the present invention, for a yarn conditioning section (180), the bobbins
(164) of the jute-cotton yarn (190) or packages (174) of the jute cotton yarn (190)
are place in a steam chamber and steamed at 90 degree C for 2 hours with dry
10 saturated steam for allowing soaking of moisture and releasing stresses imparted
due to the twist in the jute-cotton yarn (190).
The jute-cotton yarn (190) produced by the above spinning system (100) has a
feeling, flexibility like a cotton yarn and functionality of the jute i.e. anti microbial,
anti-bacterial, anti-fungal, quick wetting and quick release.
15 The present invention further provides a system for dyeing jute cotton yarns (200)
(herein after referred to as dyeing system) as shown in Fig 4. The system for
dyeing jute-cotton yarns (200) comprises a warping section (210), a dyeing section
(220), a sizing section (230) and a drying section (240).
As per the present invention, a warping section (210) warps conditioned jute-cotton
20 yarns (190) on packages (174) at a creel tension 35-45 gm with a guide distance of
150-300 mm at a linear speed of 250-450 m/min on a warper beam (212).
A dyeing section (220) of the dyeing system (200) dyes warp sheet (224) prepared
by combining individual sheet (222) from the predetermined number of the warper
beams (212) and is passed through the pretreatment tanks (225), dyes tanks (226)
25 and washing tanks (227). Initially i.e. before wetting of the jute-cotton yarn sheet in
pretreatment tank (225), the tension in each jute-cotton yarn (190) of the warp
14
sheet (224) is reduced to 20-30 gm per end of the jute-cotton yarns (190) in the
warp sheet (224) and then increasing the tension in each jute-cotton yarn of the
warp sheet (224) to 60-85 gm per end of the jute-cotton yarns (190) in the warp
sheet (224) in wet condition as the sheet of the jute-cotton yarns passed through
the pretreatment tanks (225) and dyeing tanks (226). After dyeing, 5 the dyed warp
sheet (224) of the jute-cotton yarns (190) is dried to a level of 20-25% of moisture
content. The dye used for dyeing is indigo dye or sulphur colors.
A sizing section (230) of the dyeing system (200) includes at least two dips (232)
and squeeze nips (234) for twice dipping of the dyed warp sheet (224) of the jute10
cotton yarns (190) in the tank containing a paste of starch (Anisole – e/50), flexible
binder (arcoester) and lubricating agents. The paste in the sizing tank (235) has a
viscosity of 5-6 seconds along with 6-8% (w/w) solid content for improving
penetration of the paste in the jute-cotton yarns (190) without stiffening of the jutecotton
yarns (190) in the warp sheet (224).
15 The sizing section (220) is followed by a drying section (230) of the dyeing system
(200) for drying the sized and dyed warp sheet (224) of the jute-cotton yarns (190)
to 12-14% moisture content before winding of the jute-cotton yarn (190) on a
weaver’s beam (232).
The present invention further provides a system for manufacturing a fabric from the
20 weaver’s beam (232) (herein after referred to as a fabric manufacturing system) of
the dyed jute-cotton yarn (190) as shown in Fig 6. The fabric manufacturing system
(300) comprises a weaving section (310) and a finishing section (320).
The weaving section (310) of the fabric manufacturing system (300) interlaces the
dyed jute-cotton yarns (190) on warp weaver beams with jute cotton yarns (190)
25 from weft packages by employing an air jet loom (315) having a shed height
between 68-75 mm allowing gradual increase and decrease of shedding tension by
15
staggering of heald frames (not shown) about 8-10 mm to produce a jute-cotton
fabric (312) by keeping warp tension between 50-70gm/yarn. During weaving
process, the dyed jute-cotton yarns (190) are in warp direction is required to be
knotted. In the present invention, the jute-cotton yarn (190) are knotted by
application of oil and drying for at least 30 min before starting the 5 weaving process
again. Further, the pressures of auxiliary, main and sub nozzles (not shown) of the
air jet loom (315) is reduced and maintained from 0.6 to 0.8, 1.8 to 2.3 and 2.8-3.2
respectively in order to carry out weaving process smoothly. The weft yarn cutter
(not shown) has supplied with reduced air pressure 0. 5 bar for cutting the jute10
cotton yarn (312).
The finishing section (320) of the fabric manufacturing system (300) is carried out
by singing, de-sizing, mercerizing, calendaring and sanforizing of the jute-cotton
fabric (312) to remove hairs, lower grade cellulose, stiff standing jute hairs and limit
shrinkage of the jute-cotton fibers in the jute-cotton fabric (312) less than 4% in
15 warp direction and 1.5 % in weft direction thereby producing a jute cotton fabric
(312) having cotton like filling and functionality of the jute.
As per the present invention, fabric manufacturing system (300) manufactures a
jute-cotton fabric having width of 56-60 inch due to the higher swelling of the jute
yarn (312) in the dyeing process and for optimization of the weft pressure during
20 weaving.
According to the present invention the garment stitched from the jute-cotton fabric
requires to be washed with pumice stones and enzyme from both side for
spreading of tip of the jute fibers protruding out on the surface of the jute-cotton
fabric.
16
The present invention allows producing a jute fabric that can be used for stitching
apparels having proportion of jute fibers more than cotton fibers. Further garment or
apparels have cotton like feel and functionality of the jute without itching effect.
While the present invention has been described with respect to certain preferred
embodiments, it will be apparent to those skilled in the art that various 5 changes and
modification may be made without departing from the scope of the invention as
defined in the following claims.
17
WE CLAIM:
1. A system for spinning jute fibres with cotton fibres for manufacturing a jute-cotton yarn,
said spinning system comprising:
a mixing section for mixing staple jute fibres and cotton fibres 5 in a predetermined
proportion wherein jute fibres and cotton fibres are stacked in alternate layers to form
a sandwich stack of the fibres, cut vertically and tumbled to obtain homogeneous
mixture of the fibres;
a blowing section which includes a bale breaker/blender, fibre opener, fibre mixer,
10 fine fibre opener and optionally lap former for cleaning the mixed fibres;
a carding section which retains longer fibre by removing the small fibres from the
mixture of fibres along with fining of the fibres and produces sliver of the mixed
fibres;
a drawing section which blends, draws and parallelizes the jute-cotton fibres in the
15 sliver;
a roving section which draft the sliver to form a roving along with a twist;
a spinning section which further drafts at least one jute-cotton roving of the mixture
of the jute and cotton fibres forming a jute-cotton yarn and wound the yarn on a
bobbin; and
20 a yarn conditioning section which conditions the yarns with dry saturated steam by
allowing soaking of moisture and relaxing stress imparted due to the twist in the jutecotton
yarn at 90 degree C for 2 hours;
wherein the jute-cotton yarn has a feeling, flexibility like a cotton yarn and
functionality of the jute.
25 2. The system as claimed in claim 1, comprises a winding section, which transfers the
yarns from bobbins to packages removing the faults in the yarns.
3. The system as claimed in claim 1, wherein speed of the fibre opening rollers of the
blowing section is maintained between 400-500 rpm along with grid bars are adjusted to
minimum opening angle for running the blend of the jute cotton fibres on the opening
30 machine.
4. The system as claimed in claim 1, wherein the length of the small fibres removed at
the carding section is less than 12 mm.
5. The system as claimed in claim 1, wherein a passage of the drawing machine at the
delivery side is kept empty by removing components such as condenser and transport tube
18
for supplying drafted mixed jute-cotton fibres directly to trumpet of the drawing machine to
form a sliver of the jute-cotton fibres.
6. The system as claimed in claim 1, wherein distance between the rollers of front
drafting zone of 36-38 mm, back drafting zone of 40-44 mm along with lower break draft
5 of 1.36-1.40.
7. The system as claimed in claim 1, wherein ring-spinning machine is used in the
spinning section with only main drafting zone with aprons.
8. The system as claimed in claim 7, wherein smaller spacer size along with higher twist
multiplier is adapted in the spinning machine depending upon the yarn count and
10 application of the yarn for improving uniformity and strength of the yarn.
9. The system as claimed in claims 1-8, wherein two roving are blended together to
improve yarn evenness.
10. The system as claimed in any of the preceeding claims 1-9, as and when applied to
make jute-cotton yarn having a yarn count between Ne 5.3/1-Ne 20/1 along with having a
15 feel like a cotton yarn and functionality of the jute and to produce fabrics and garments
from the said jute cotton yarn.