The document discusses linear density, which is a measurement of yarn thickness or fineness. It is not possible to directly measure yarn diameter due to its soft and compressible nature. Instead, linear density systems weigh a known length of yarn to determine fineness. The two main systems are direct, which fixes length and varies weight, and indirect, which fixes weight and varies length. Several linear density designation systems are described, including tex, denier, English count, and their respective calculation methods. Factors like moisture content and different fiber properties are accounted for in linear density measurements.
The compact spinning is a process where fiber strand drawn by drafting system is condensed before twisting it.Following methods are used by machine manufacturers to condense the fiber strand.
1. Aerodynamic condensing.
2. Mechanical condensing.
3. Magnetic condensing.
Compact spinning has a promising future because of the higher production and improved quality of compact yarns
Feature and properties of two guide bar warp knit designs Md Fahimuzzaman
Feature and properties of two guide bar warp knit designs
Features of two guide bar warp knit design:
Good Dimensional stability, reasonable cover
Better loop shape and ladder resistance
Reasonable weight
Better pattern scope
Needle punch is the second-largest market segment in terms of capacity after the spunbond process segment. It is a continuously growing market with new opportunities and growing demands in its core applications like automotive, geotextiles, filtration, and home products.
For more information log on to www.ategroup.com.
Variation in linear density of combed yarn due to dyeing with reactive dye in...eSAT Journals
Abstract Though yarn dyeing is a significant part of wet processing, it still has some major obstacles. It loses its weight as well as strength due to wet treatment. A study on the changes of linear density in combed yarn due to different shade percentages of reactive dye has been conducted and the results are statistically analyzed. Remazol Red RR, Remazol Yellow RR and Remazol Blue RR were used for this experiment. The study reveals that dye shade percentage effects on the linear density negatively. Before 2.5% shade the yarn loss is greater and after 3.5% shade linear density also decreases. 2.5% to 3.5% shade percentage can be taken as the range where loss of linear density is much less than the other percentages. The lowest loss percentage was found for 3% shade for every dyestuff among which Remazol Red RR was the least. Key Words: Combed yarn, Loss percentage, Shade, Linear density.
The compact spinning is a process where fiber strand drawn by drafting system is condensed before twisting it.Following methods are used by machine manufacturers to condense the fiber strand.
1. Aerodynamic condensing.
2. Mechanical condensing.
3. Magnetic condensing.
Compact spinning has a promising future because of the higher production and improved quality of compact yarns
Feature and properties of two guide bar warp knit designs Md Fahimuzzaman
Feature and properties of two guide bar warp knit designs
Features of two guide bar warp knit design:
Good Dimensional stability, reasonable cover
Better loop shape and ladder resistance
Reasonable weight
Better pattern scope
Needle punch is the second-largest market segment in terms of capacity after the spunbond process segment. It is a continuously growing market with new opportunities and growing demands in its core applications like automotive, geotextiles, filtration, and home products.
For more information log on to www.ategroup.com.
Variation in linear density of combed yarn due to dyeing with reactive dye in...eSAT Journals
Abstract Though yarn dyeing is a significant part of wet processing, it still has some major obstacles. It loses its weight as well as strength due to wet treatment. A study on the changes of linear density in combed yarn due to different shade percentages of reactive dye has been conducted and the results are statistically analyzed. Remazol Red RR, Remazol Yellow RR and Remazol Blue RR were used for this experiment. The study reveals that dye shade percentage effects on the linear density negatively. Before 2.5% shade the yarn loss is greater and after 3.5% shade linear density also decreases. 2.5% to 3.5% shade percentage can be taken as the range where loss of linear density is much less than the other percentages. The lowest loss percentage was found for 3% shade for every dyestuff among which Remazol Red RR was the least. Key Words: Combed yarn, Loss percentage, Shade, Linear density.
importance of fibre finess,influences of fibre finess ,effect on stiffness , effect on torsional rigidity, reflection of light , dye absoprtion, method of measurement ,gravimetric method, micronaire
Effect of count and stitch length on spirality of single jersey knit fabriceSAT Journals
Abstract
The following paper focuses on change in spirality due to stitch length and count variation .This work was carried out with 12 samples of single jersey knit fabrics which were scoured and bleached with NaOH and H2O2 (35% strength), dyed with reactive dye (Remazol Yellow RR reactive class) and were finished as standard procedure . After finishing the samples were tested for spirality and compared between different stitch length and count. The result obtained in this research indicated that spirality increases strongly due to increase of stitch length when count of yarn is fixed and on fixed stitch length spirality increases with the increment of count.
Keywords: Spirality, Count, Stitch length.
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Palestine last event orientationfvgnh .pptxRaedMohamed3
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1. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
1/7
LINEAR DENSITY:
The thickness or diameter of a yarn is one of its most fundamental properties.
However, it is not possible to measure the diameter of a yarn in any meaningful way.
This is because the diameter of a yarn changes quite markedly as it is compressed.
Yarn is a soft assembly of fibres
There are voids spaces between the fibres within yarn
(Most methods of measuring the diameter of yarn involve compressing the yarn and
hence the measured diameter changes with the pressure used. So mechanical means, devices
can’t be used for measuring the diameter of the yarn.)
yarn is thinner at twisted places and thicker where twist is less
Yarn appears vivid because of the hairiness; it has protruding fibres upon its
surface and also sometimes loops of fibers (kinks).
(Due to undefined boundaries, optical methods e.g. microscope can’t be used to measure
yarn diameter)
Also there are lots of differences in the structure and cross section of different
fibres
Wool has nearly round cross-section
Silk has a triangular cross-section
Cotton is like flattened tube
Man-made fibres are often made with trilobal (nylon), star or hollow
cross-section for particular purposes.
Due to these problems, there are no such devices to measure the diameter of a
yarn. Instead, systems of denoting the fineness of a yarn by weighing a known length
have evolved. This is known as the linear density. Simply it the yarn thickness or
coarseness. There are two systems:
1) Direct system
2) Indirect system
1: Direct System: w/l
In this system of counting, length unit is fixed and weight unit is variable. It is
defined as weight per unit length. When count increases, fineness decreases (count↑
fineness↓). It is further classified as:
a) Tex system
b) Denier system
c) Grex system
a) Tex System (Tt): It is defined as no of grams per 1000 meters length.
Multiples are based on weight unit and are as under
Milli-tex (mTex): no of mg per 1000 meters length. It is used for yarn and roving.
Deci-tex (dTex): no of decigrams per 1000 meters length. It is used for sliver.
Kilo-tex (KTex): no of kilograms per 1000 meters length. It is used for laps.
Tex is universal system either for spun or filament yarn.
b) Denier System (Td):
It is defined as no of grams per 9000 meters length.
texengr05@yahoo.com
2. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
2/7
c) Grex System (Tg):
No of grams per 10000 meters length
2: Indirect System: l/w
In indirect count system weight unit is fixed and length is variable on which basis
measurement is done. When count increases, fineness increases. (count↑ fineness↑)
This includes:
a) English Count (Ne):
In this system, the weight unit is in lbs and length unit is hanks; No of hanks per
pound. Hank length varies for different fibers or yarns.
Cotton = 840yards
Wool = 256yards
Spun Silk = 840yards
Bast fibers (linen) = 300yards
Worsted = 560yards
b) Metric Count (Nm):
It is defined as no of 1000 meters length/Kg. It is commonly used for heavy yarns.
Count Conversion Table:
Ne=
Nm=
Tex=
Grex=
Denier=
Ne
1 xNe
1.693xNe
590.5 /Ne
5905 /Ne
5315 /Ne
Simplified calculations:
Calculations for Tex:
1000 m 1 g (1 Tex)
1m
1 mg (1 Tex)
100 cm 1 mg (1 Tex)
50 cm 0.5 mg (1 Tex)
Calculations for Denier:
9000 m 1g
(1 denier)
9m
1 mg (1 denier)
900 cm 1 mg (1 denier)
9 cm
0.01 mg (1 denier)
Nm
0.5905 xNm
1 xNm
1000 /Nm
10,000 /Nm
9000 /Nm
Tex
590.5 /Tex
1000 /Tex
1 xTex
10 xTex
9 xTex
Grex
5905 /Grex
10,000/Grex
0.1 xGrex
1 xGrex
0.9 xGrex
Denier
5315 /Den
9000 /Den
0.111 xDen
1.111 xDen
1 xDen
Calculations for Grex:
10,000 m 1g (1 Grex)
10 m 1mg (1 Grex)
1m
0.1mg (1 Grex)
50 cm
0.05mg (1 Grex)
Calculations for Ne:
840 yd 1lb (1 Ne)
840 yd 453.6g (1 Ne)
1.85 yd
1g (1 Ne)
66.67in
1g (1 Ne)
33.33in
0.5g (1 Ne)
Calculations for Nm:
1000 m * X(count) 1kg (X Nm)
1000 m * 1
1000g (1 Nm)
1m
1g (1 Nm)
50 cm
0.5g (1 Nm)
texengr05@yahoo.com
3. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
3/7
Effect of linear density on Hairiness:
Yarn linear density is statistically significant when evaluating both yarn counts
together with SPSS. We found a direct relationship between yarn linear density and
hairiness; the hairiness increases when the yarn linear density increases. In other
words, coarse yarns have more hairs than fine yarns for all the observed hair lengths.
This can be explained by the increase of fibres in the cross-section of yarn.
Designation/Nomenclature of Yarn:
Single Yarn: (spun or cotton)
It is identified through one group of three symbols:
24/S/15
Where 24-count, S-direction of twist, 15-twist level or TPI
Single Yarn: (filament yarn):
100(15)/S/80
Where 100-denier count, (15)-no of monofilaments in filament yarn,
S-direction of twist, 80-level of twist i.e TPM
Plied Yarn:
It is identified through two groups of three symbols:
24/S/15, 2/Z/12
Where 24-Ne (cotton count), S-direction of twist, 15-TPI, 2-no of plies,
Z-direction of twist of "yarns", 12-TPI
Cabled yarn:
It is identified by three groups of three symbols:
20/Z/10, 2/S/8, 2/Z/6
Where 20-Ne, Z-direction of twist in individual yarn, 10-TPI, 2-no of plies of single yarn, Sdirection of twist, 8-TPI, 2-no of plies of plied yarns, Z-direction of twist, 6-TPI
Measuring Linear Density:
Sampling:
For lots that contain five cases or less, the sample should consist of all the cases.
Ten packages are selected at random but in approximately equal number from each
case. For lots that consist of more than five cases, five cases should be selected at
random from each of these cases. In all cases, sampling ends up with ten cases.
Effect of Moisture Content:
Yarns contain a varying amount of moisture depending on the constituent
fibres and the moisture content of the atmosphere where they have been stored. The
additional moisture can make an appreciable difference to weight and hence the linear
density of yarn. So there are three conventional methods of expressing linear density.
Each of which has a different way of dealing with moisture content.
texengr05@yahoo.com
4. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
4/7
a) Linear density as received:
In this method no allowance is made for the moisture content, the linear density
measured on the yarn as it is. Numbers of skeins are wound on a wrap reel which has
a circumference of a convenient length e.g., 1 meter. Then linear density is calculated
from the total length and total weight.
When measuring the length of a piece of yarn or when reeling a given length of
yarn it is important that the operation is carried out using a standard tension. On
wrap reel while reeling a hank of yarn, tension is set by introducing the correct
amount of friction into the yarn path.
Skein gauge:
The skein gauge shown in the fig checks the length of a 50 wrap skein under a
standard tension. The test hank is passed round the lower fixed peg and the upper peg
which forms one arm of a balance. The load on the other end of the balance is set at
50g x the nominal tex of the yarn. If the length of the hank is correct the pointer will be
opposite the zero mark. Any deviation from the correct length is shown directly as a
plus or minus percentage. The length of the skein should be within 0.25% of the actual
girth of the reel, the reeling tension of the wrap reel being adjusted to achieve this.
Because the yarn on a package may be under
Jaw
tension it is correct practice first to wind a hank from
the package of sufficient length for all the tests which
Hank
Load
are to be carried out. This is then allowed to relax
without any tension for 4h before winding the actual
test skeins from it.
Jaw
b) Linear density at standard testing atmosphere:
In this method the skeins of yarn are preconditioned for 4h by drying in an
oven at 50º C. They are then conditioned in the standard atmosphere (20±2 º C, 65±4%
RH) for 24 h. The reason for preconditioning the yarn is so that the equilibrium
moisture content is approached from the same side each time, thus avoiding the
effects of hysteresis. The reeling of the hanks and calculation of the linear density are
then carried out as above.
c) Linear density at correct condition:
This method is more accurate than the previous one as the amount of moisture
contained by the fibres in equilibrium with the standard atmosphere can vary. In the
method, the hanks are reeled as above and then dried to oven dry weight (105C-two
consecutive weighing the same) and weighed. The dry weight then has the
appropriate standard regain allowance added to it and the linear density is then
calculated from this weight.
Weight at correct condition
= dry weight x (100 + standard regain)/100
texengr05@yahoo.com
5. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
5/7
Linear density from a fabric sample:
When the linear density of a yarn has to be determined from a sample of fabric,
a strip of the fabric is first cut to a known size.
A number of threads are then removed from it and their uncrimped length is
determined under a standard tension in a crimp tester.
All the threads are weighed together on a sensitive balance and from their total
length and total weight; the linear density can be calculated.
Yarn from a finished fabric may have had a resin or other
type of finish applied to it so that its weight is greater
than that of the original yarn. Alternatively it may have
lost fibres during the finishing process so that its weight
may be lower than that of the original yarn. For these
reasons the linear densities of yarn from finished fabrics
can only represent an estimate of the linear density of the
yarn used to construct.
When yarn is removed from a fabric it is no longer straight but it is set into the
path that it took in the fabric as shown in fig. This distortion is known as crimp and
before the linear density of the yarn can be determined, the crimp must be removed
and the extended length measured.
Shirley crimp tester:
The crimp tester is a device for measuring the crimpfree length of a piece of yarn removed from a fabric. The length of the yarn is
measured when it is under a standard tension whose value is given in Table. The
instrument is shown diagrammatically in Fig. and consists of two clamps, one of
which can be slide along a scale and the other which is pivoted so as to apply tension
to the yarn. The sample of yarn removed fro the fabric is placed in the clamps with
each end a set distance into the clamp; this is because the length of yarn in the clamps
has to be allowed for in the measurement. The right hand clamp can be moved along
the scale and it has an engraved line on it at which point the extended yarn length can
be read. The left hand clamp is balanced on a pivot with a pointer arm attached. On
the pointer arm is a weight which can be moved along the arm to change the yarn
tension, the set tension being
indicated on a scale behind it.
At zero tension the left hand
clamp assembly is balanced
and the pointer arm lines up
against a fixed mark. As the
weight is moved along the
arm the clamp tries to rotate
around the pivot, so applying
a tension to the yarn.
When a measurement is
being made the movable
texengr05@yahoo.com
6. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
6/7
clamp is slid along the scale until the pointer is brought opposite the fixed mark. At
this point the tension in the yarn is then the value which was set on the scale. The
length of the yarn can then be read off against the engraved line.
The crimp, which is the difference between the extended length and the length
of the yarn in the fabric, is defined as:
Percentage crimp: (Li + Lo)/Lo x 100
Lo = distance between ends of the yarn as it lies in the fabric
Li = straightened length of yarn
Yarn tensions for the crimp tester:
Yarn type
Woolen & worsted
Cotton
Man made continuous
filament yarn
Linear density
15 to 60 tex
61 to 300 tex
7 tex or finer
Coarser than 7 tex
All
Tension (cN)
(0.2 x tex) + 4
(0.07 x tex) + 12
0.75 x tex
(0.2 x tex) + 4
0.5 x tex
Applications of Linear density:
1) Total length on a yarn package:
1) Package wt: 2.5 lb & Ne 20:
Cotton:
840 x count = 1 lb
840 x 20 = 1 lb
16800 = 1 lb i.e 16800 yards length
weighs 1 lb
Then 2.5 lb cone length: 16800 x 2.5
= 42000 yards
Worsted:
560 x count = 1 lb
560 x 20 = 1 lb
11200 = 1 lb i.e. 11200 yards length
weighs 1 lb
Then 2.5 lb cone length: 11200 x 2.5
= 28000 yards
Woolen:
256 x count = 1 lb
256 x 20 = 1 lb
5120 = 1 lb i.e. 5120 yards length
weighs 1 lb
Then 2.5 lb cone length: 5120 x 2.5
= 12800 yards
2) Package wt: 2 lb, 80 spun polyester:
(Spun polyester means that it is cut
into small fibres like cotton)
840 x count = 1 lb
840 x 80 = 1 lb
67200 = 1 lb i.e. 67200 yards length
weighs 1 lb
Then 2 lb package length: 2 x 67200
= 134400 yards
3) Package wt: 2 kg, 100/2 denier
Nylon filament
(For filament yarn, 100/2=200,
50/2=100)
9000 m = 200 g
Then 2 kg cone length: (9000 x 2)/0.2
= 90,000 m
(30/2 viscose spun=15, 20/2=10)
4) Package wt: 3 kg, 100 denier
Polyester:
9000 m = 100 g
9000 m = 0.1 g
Then package weighing 3 kg have
length: (9000 x 3)/0.1
= 270,000 m
5) Package wt: 2 lb, Tex count = 20
1000 m = 20 g
1000 m = 0.0441 lb
2 lb package will have length:
texengr05@yahoo.com
7. Abu Bakkar Marwat-Textile Engineer
LINEAR DENSITY
7/7
(1000 x 2)/0.041 = 45351 m
2) Fabric cost:
Fabric construction:
20 x 16/ 128 x 60 60”
3/1 S twill Leno
Warp crimp = 6%
Weft crimp = 8%
Total length = 36000 yards
Warp weight = (total ends x tape length)/(840 x warp count) {lbs} ----- (1)
Now for total ends, we have = (ends/in x width of fabric)+selvage ends + extra ends
= (128 x 63) + (2*24) + 10
= 8064 + 48 + 10
= 8122
For tape length:
Ly = Lf (1 + C) = 36000 (1+6%) = 36000(1.06) = 38160 yards
Putting values in equ. 1:
= (8122 x 38160)/(840 x 20) = 18448.54 lbs
Total bags = 18448.54/100 = 184.48
(one bag=100lbs)
Total cones = 184.48*40 = 7379 cones
(one cone=2.5lb & one bag = 40 cones)
Warp cost: price of cone x No of cones = 240*7379 = 1770960 rupees
Weft weight = (total picks x reeded width)/(840 x weft count)
----- (2)
Now for total picks, we have = picks/inch x fabric length + Extra picks
= (60*36) x 36000 + 10
= 77760010
For reeded width:
Ly = Lf (1 + C) = 63 (1+8%) = 63 (1.08) = 68.04” = 68.04/36 = 1.89 yd
Putting values in equ 2:
= (77760010 x 1.89)/(840 x 16) = 10935 lbs
Total bags = 10935/100 = 109.35 bags
Total cones = 109.35*40 = 4374 cones
Weft cost: price of cone x No of cones = 225*4374 = 984150 rupees
Total cost = 77760010 + 984150 = 2755110 rupees
texengr05@yahoo.com