Warp knitting is a method of knitting where loops are formed vertically along the length of fabric from warp yarns. There are several types of warp knitting including tricot, raschel, and milanese knits. Tricot knits use compound needles and are used for fabrics like lingerie, loungewear, and uniforms. Raschel knits use latch needles and heavier yarns, producing more textured fabrics for applications like carpets, home textiles, and outerwear. Milanese knits form diagonal patterns and are often made from filament yarns into lightweight fabrics.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
In weft knitting, the loops are formed across width of the fabric Each weft thread is fed , more or less at right angles to the direction in which the fabric is produced.Weft-knit fabrics may also be knit with multiple yarns, usually to produce interesting color patterns.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
In weft knitting, the loops are formed across width of the fabric Each weft thread is fed , more or less at right angles to the direction in which the fabric is produced.Weft-knit fabrics may also be knit with multiple yarns, usually to produce interesting color patterns.
Huckaback weave has a number of warp and weft threads with long float, making the fabric soft and moisture absorbent,and plain weave threads ensuring firmness of structure.
Jacquard shedding system was developed by William Jacquard. In case of cam and dobby shedding systems, large number of yarns passing through a heald is controlled.Thus it precludes the possibility of controlling individual ends independently. Therefore, complicated woven designs cannot be made using cam or dobby shedding systems. With the jacquard shedding system individual ends can be controlled independently and thus large woven figures can be produced in fabrics.
Terry fabric is a knitted fabric with ring yarn or terry covering at one or both sides. It belongs to one of the fancy knitted fabrics. Terry fabric is characterized by soft touch, thick texture, excellent water absorption and heat retention. Terry fabric can be divided into single-sided and double-sided terry loop fabrics. The terry can form pattern effect on the knitting surface distributed according to some certain rules. Terry fabric after shearing or other process can be turned into fleece fabric or velvet fabric.
Loom is machine or device which is used to produce woven fabric. It is the central point of whole process of cloth production. In other word, a loom is a mechanism or tool used for weaving yarn and thread into textiles. Looms vary in a wide assortment of sizes. They come in huge free standing hand looms, tiny hand-held frames, to vast automatic mechanical tools. A loom can as well pertain to an electric line construction like that of a wiring loom. The main task of looms is to clutch the twist threads under pressure to enable the progress of interweaving of the woof strands. The loom's system and exact form can differ to some extent; however it still performs the basic application.
Huckaback weave has a number of warp and weft threads with long float, making the fabric soft and moisture absorbent,and plain weave threads ensuring firmness of structure.
Jacquard shedding system was developed by William Jacquard. In case of cam and dobby shedding systems, large number of yarns passing through a heald is controlled.Thus it precludes the possibility of controlling individual ends independently. Therefore, complicated woven designs cannot be made using cam or dobby shedding systems. With the jacquard shedding system individual ends can be controlled independently and thus large woven figures can be produced in fabrics.
Terry fabric is a knitted fabric with ring yarn or terry covering at one or both sides. It belongs to one of the fancy knitted fabrics. Terry fabric is characterized by soft touch, thick texture, excellent water absorption and heat retention. Terry fabric can be divided into single-sided and double-sided terry loop fabrics. The terry can form pattern effect on the knitting surface distributed according to some certain rules. Terry fabric after shearing or other process can be turned into fleece fabric or velvet fabric.
Loom is machine or device which is used to produce woven fabric. It is the central point of whole process of cloth production. In other word, a loom is a mechanism or tool used for weaving yarn and thread into textiles. Looms vary in a wide assortment of sizes. They come in huge free standing hand looms, tiny hand-held frames, to vast automatic mechanical tools. A loom can as well pertain to an electric line construction like that of a wiring loom. The main task of looms is to clutch the twist threads under pressure to enable the progress of interweaving of the woof strands. The loom's system and exact form can differ to some extent; however it still performs the basic application.
Introduction of knitting, prepared by students of Daffodil International Univ...Matiur Rahman khan Babu
This slide is for the student of Textile Engineering of initial stage of knitting of fabric formation. prepared by Matiur,Mesbah, Amzad, Shakil, Rifat & tuhin
Introduction, Classification,Characteristics, plain weave,Modification of plain weave, warp rip weave, weft rip weave, uses, matt rib weave, Twill weave, Classification of twill weave, right hand and left hand twill herring bone, satin and sateen weave and End uses of satin and sateen weave
The increased availability of biomedical data, particularly in the public domain, offers the opportunity to better understand human health and to develop effective therapeutics for a wide range of unmet medical needs. However, data scientists remain stymied by the fact that data remain hard to find and to productively reuse because data and their metadata i) are wholly inaccessible, ii) are in non-standard or incompatible representations, iii) do not conform to community standards, and iv) have unclear or highly restricted terms and conditions that preclude legitimate reuse. These limitations require a rethink on data can be made machine and AI-ready - the key motivation behind the FAIR Guiding Principles. Concurrently, while recent efforts have explored the use of deep learning to fuse disparate data into predictive models for a wide range of biomedical applications, these models often fail even when the correct answer is already known, and fail to explain individual predictions in terms that data scientists can appreciate. These limitations suggest that new methods to produce practical artificial intelligence are still needed.
In this talk, I will discuss our work in (1) building an integrative knowledge infrastructure to prepare FAIR and "AI-ready" data and services along with (2) neurosymbolic AI methods to improve the quality of predictions and to generate plausible explanations. Attention is given to standards, platforms, and methods to wrangle knowledge into simple, but effective semantic and latent representations, and to make these available into standards-compliant and discoverable interfaces that can be used in model building, validation, and explanation. Our work, and those of others in the field, creates a baseline for building trustworthy and easy to deploy AI models in biomedicine.
Bio
Dr. Michel Dumontier is the Distinguished Professor of Data Science at Maastricht University, founder and executive director of the Institute of Data Science, and co-founder of the FAIR (Findable, Accessible, Interoperable and Reusable) data principles. His research explores socio-technological approaches for responsible discovery science, which includes collaborative multi-modal knowledge graphs, privacy-preserving distributed data mining, and AI methods for drug discovery and personalized medicine. His work is supported through the Dutch National Research Agenda, the Netherlands Organisation for Scientific Research, Horizon Europe, the European Open Science Cloud, the US National Institutes of Health, and a Marie-Curie Innovative Training Network. He is the editor-in-chief for the journal Data Science and is internationally recognized for his contributions in bioinformatics, biomedical informatics, and semantic technologies including ontologies and linked data.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
2. Warp knitting is a method of
fabric formation in which the
loops are made in a vertical way
along the length of the fabric
from each warp yarns.
Thus, there will be a needle for each yarn. The knitted
stitches in warp knit fabrics have a crisscross diagonal
appearance which feels smoother than weft knits.
Warp knitting differs from weft knitting, basically in that
each needle loops its own thread.
3. The needle produce parallel rows of loops
simultaneously that are interlocked in a zigzag
pattern.
The stitches on the face of the fabric appear
vertically, but at a slight angle and the back appear
horizontally as floats at a slight angle.
These floats called laps, or underlaps are called
laps or underlaps are a distinguishing identification
of warp knits.
4. It shows less elasticity than weft knitting.
It becomes favorable over weft in properties like soft and
drapery, higher density, warm to wear.
Through this process many different types of yarn can be
processed like combed, staple, carded and filament which
is not possible with weft knitting.
It may be flat or tubular and can be produced in many
varieties of patterns.
It can yield cloth with a dimensional stability almost
equal to that of woven fabrics.
6. Warp Knitted Fabrics
Tricot
Knits
Bearded /
Compound Needle
Double
Needle
Bar
Gloves,
Lingerie
Single
Needle
Bar
Weft Insertion, Pile
Fabric, Curtain,
Lining
Raschel Knits
Double Needle Bar
Carpet,
Pile
Single Needle Bar
Standard (co
weave knit, weft
inlay)
Multiple
Guide Bars,
(Crochet,
Milanese)
7. The word tricot comes from the
French word “Tricoter” which
means to knit.
Each set of yarns from a warp
beam is fed to a row of needles arranged across the width of
the machine and is controlled by yarn guides set in a
guide bar that is also laid across the machine.
8. Tricot fabrics have many good attributes.
They are porous and permit passage of
water vapor and air for body comfort.
They also offer bulk without undue weight.
Tricot fabrics are soft, wrinkle resistant, and
have good drapability.
9. They have controllable elasticity and they do
not run or fray.
Tricot construction contributes to good
abrasion resistance and high bursting and
tearing strength.
Other factors that contribute to the fabrics
strength are the fiber and yarn structure.
10. Tricot knits are used for a wide variety of
fabric weights and designs.
Typical uses of tricot fabrics are lingerie,
lounge wear, sleep wear, blouses, shirts,
dresses, slacks, uniforms for nurses and
waitresses, bonded fabric material, outer
wear and automobile upholstery. These
fabrics may be identified by type.
11. In tricot warp knitting machine compound
needles are used.
The warp yarns are feed to the needles through
guide bars using shogging and swinging
motion.
Normally tricot warp knitting machine is used
for fashion fabrics, mesh fabrics.
12. Modern tricot machines are constructed with
compound needles, while in the past tricot
machines were equipped with beard needles.
Tricot machines are commonly equipped with
from two to four yarn guide bars and require the
same number of warps to be used.
14. The raschel knit ranks in importance of production with
tricot, but it surpasses it in variety of products, which range
from veilings and laces to power nets for foundation
garments to such pile fabrics as carpets.
The raschel knit is made with latched needles rather than
the bearded type used for tricot, Milanese and simplex.
15. The raschel fabrics can usually be
distinguished from tricot fabrics
in that raschel constructions are made
with heavy yarns and usually have an
intricate, lacelike pattern, whereas tricot constructions are
made with fine yarns and are either flat or have a simple
geometric pattern.
Raschel
16. Raschel machines are extremely versatile.
They can knit every type of yarn made of any
kind of fiber, including metallic and glass,
and in any form, whether staple or filament,
standard or novelty.
Knits can be lacy, highly patterned and even
piled.
17. It includes a fabric which can be dense or compact,
open or lofty, stable or stretchy, single faced or
reversible.
It can be identified by their intricate designs.
The use can be in almost any garment due to high
customization of the raschel machine from
lightweight lace to heavy chenille.
The machines can produce both flat and tubular
warp knit fabrics.
18. Made from heavier yarns, Raschel knits are used for
manufacturing versatile and flexible fabrics.
These are more textured and can be used for a wide range
of technical textile applications.
Such as- automotive textiles, home textiles, lingerie,
mosquito nets, lightweight coating substrates,
sportswear/swimwear, lining fabrics, outerwear, etc.
Different types of single and double needle bar Raschel
machines are built today for the production of a wide variety
of products ranging from sacks to artificial blood vessels.
19. Such as- automotive textiles, home textiles, lingerie,
mosquito nets, lightweight coating substrates,
sportswear/swimwear, lining fabrics, outerwear, etc.
Different types of single and double needle bar Raschel
machines are built today for the production of a wide variety
of products ranging from sacks to artificial blood vessels.
Seamless tubular fabrics, pile fabrics and many other special
fabrics can easily be produced in double needle bar machine
by using 4 to 6 guide bars.
20. But by using more number of guide bars (16 and
above), production of branching tubular fabrics such as
artificial blood vessels, patterned panty-hose etc. and
shaped innerwear is no more a problem.
Warp knitted spacer fabric (WKSF) is a three-
dimensional textile which is also made by a double-
needle bar Raschel machine.
21. Raschel warp knitting machine may be made
with either single needle bar or double needle
bar.
In Raschel, yarns coming from the beam as
parallel sheet are converted into fabric by loop
formation before being wound in open width
form on the cloth roller.
22. Nowadays Raschel machines are available with
weft insertion facility.
Raschel Warp Knitting Machine is used for
lace fabric and trimming.
It is also used to produce in outdoors and
military fabrics for products such as backpacks.
24. Milanese knit is made of two sets of yarns knitted
diagonally.
The face side has fine vertical rib and the reverse has a
diagonal structure.
The Milanese stitch, though accomplished by a different
technique, produces a fabric very similar in appearance
to tricot.
It can be identified by the fine rib on the face and a
diagonal pattern on the back.
25. Milanese is knitted on the
flat bed machine with spring
beard needles and on the
circular machine with latch needles.
It is usually knitted from filament yarn into fine light
weight fabrics.
Milanese
26. It is lightweight, drapery, smooth and is
mostly used for gloves.
Milanese fabric are superior to tricot in
smoothness, elasticity, regularity of
structure and split and tear resistance.
27.
28. Tricot Knit Raschel Knit
In the past, bearded needle was used
but now a days compound needle used
Rachel m/c used latch needle together
with a wire or blade
M/C gauge expressed in needle per
inch
M/C gauge expressed in needle/inch
Chain link numbering 0, 1, 2, 3, ….etc
Chain link numbered in even numbers
0, 2, 4, ….etc
Three links per course 2 links per course
Function of sinker is holding down,
knocking and supporting the fabric
Sinker performs the function of holding
down the loops whilst the needle rise
The sinker are joined to each other at
the front and back
The sinker are not joined together by a
lead across their ends nearest to the
needle bar
29. Tricot Knit Raschel Knit
The sinker never move clear of needles
They can move clear of the needles
towards the back of the m/c for the rest
of the knitting cycle
The fabric is drawn away towards the
batching roller almost at right angles to
the needle bar
The fabric is drawn downwards from
the needles almost parallel to the bar at
an angle of 120°-160°
The warp beams are accommodated in
an inclined arc towards the back of the
m/c there the top
The warp beams are arranged above
the needle bar centered over the rocker
shaft
The warp sheets pass over the top of
the guide bar rocker shaft to their
tension
The warp sheets pass down the guide
bar
30. Tricot Knit Raschel Knit
Mechanical attention is carried out at
the front of the m/c
Mechanical attention is carried out at
the back of the m/c
The guide bars are numbered from the
back towards the front of the m/c
The guide bars are numbered from
front of the m/c
High speed production Low speed production