Knitting - InfoHouseinfohouse.p2ric.org/ref/12/11485.pdf · Each weft thread is fed at right angles...
Transcript of Knitting - InfoHouseinfohouse.p2ric.org/ref/12/11485.pdf · Each weft thread is fed at right angles...
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Knitting
To form a fabric by the intermeshing of loops of yam.
wale
course
Wen €hitt ing Loops are formed by needles knitting the yam across the width
Each weft thread is fed at right angles to the direction of fabric formation.
.- of the fabric.
9-2 Knrmng Fmdamentals
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Warp Knitting
Loops are formed by needles knitting a series of warp yarns fed parallel to the direction of fabric formation.
Wale
In warp knitting all needles knit simultaneously for all yams, while in weft knitting the needles knit in sequence for each yam.
Knrmngkvrdamentals 9-3
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Figure 9- 1 Weft (Circular) Knitting And Warp Knitting
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Consumer Acceptance
Comfortable
Pliable
High extensibility
Easy care properties
Inexpensive
Apparel, home fashion, industrial
Knmtng Furdamentals 9-5
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Productivity And lead lime
Faster than wovens
Shorter lead time, quick response
0 Smalllots
Body sizes, Full fashion
9-6 KnrmngFundarnentak
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Use Of Fibers And Yarns
Allfibers
Allyarns
Low tensions/stress allow loop formation or entrapment
Knrmngkndamentals 9-7
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Capital Investment
Low initial cost
No expensive yam preparation
Small area of floor space required
Few auxiliary machines needed for operation
9-8 KnrmngFcndamentals
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Figure 9-2 Weft Knitting
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~nrmng Fundamentals 9-9
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Basic Weft Knitting Terminology
0 Wale
0 CourseCount
0 Wale Count
0 Knithop
*- 0 Facehop
0 Backhop
0 Stitch
0 Tuckhop
0 Floathop
e Yield L
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9-10 KnltiingFundamentab
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0 CourseLength
CutorGauge
0 Gaiting
Timing
0 DialHeight
Backhop
Stitch
Tuckhop
Floathop
Yield
Wmng Fmdamentah 9-11
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Figure 9-3 Jersey Knit
9-12 Knitting Fundamentals
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Figure 9-4 1x1 Rib
KnlMng Fundamentals 9-13
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Figure 9-5 The latch Needle
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9-14 KnlmngFundamentab
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Figure 9-6 Needle Cylinder
Wmng Ftndamentds 9-15
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Figure 9-7 latch Needle Activation
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Figure 9-8 Typical Cam System Of Single Jersy
Direction Of Needle Travel b
Needle Motion Required
Clearing
Irr-----l 4 Loop pulling
c Knlttlng Fundamentals 9-17
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Figure 9-9
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9-18 KnlmngFundamentab
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Figure 9- 10
Knltling Fmdamentcrb 9-19
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Figure 9-1 1 latch Needles And Web Holding Sinkers
4 9-20 KnltHngFundomentals
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Figure 9- 12 Movements Of Latch Needles And Web Holding Sinkers
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Figure 9-13 Diagrams of Three Types of loops
Tuck Loop
9-22 KnlmngFundamentab
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Figure 9-14 Technical Face and Rear of Tuck Stitch
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Basic Weft and Warp Knitting Terminology
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Co,urse - the row of loops or stitches running across the width of a fabric corresponding to filling of a woven fabric.
WaIe - in k d t fabrics, a column of loops running lengthwise the fabric.
Course Count.- the number of courses in a knit fabric per unit length measure. For example: courses per inch.
Wale Count - the number of wales in a knit fabric per unit length. For example: wales per inch.
Knit Loop’- a stitch in a fiiYfabric%lieE the yam is formed into a loop shape by the knitting elements. Knitting meshes or interlocks these loops to form a fabric.
Face Loop - a knitted loopformed on- thr. cylinder needles on a knitted machine.
Back Loop - a knitted loop fomied on the dial needles on a knitted machine.
Stitch - in knitting a stitch is the loop geometry of a particular pattem repeat. It may be in the form oi a knitted, a tuck or a float loop.
Tuck Loop,- a knitted stitch when a needle receives a new yam withgut losing its old loop.
Float Loop - a knitted stitch when a needle holds its old loop and does not receive a new yam. It connects two loops on the same course but not in adjacent wales. AIso called’a miss-loop.
Yield - the amount of fabric delivered off a knitting machine in t e m of its I
weight per unit length or area, or the number of linear units delivered per unit weight. For example, ounces per yardi’or ounces per square yard or yards per pound.
Coursc Length - the amount of yam used in forming all the knitdoops in one course of a knitted fabric. Also called run-in.
Cut or Gauge - the number of needles per inch in the circumference of the cylinder or dial of a knitting machine. - Gaiting - the spacing of the needles in the dial and the cylinder in relation to each other on rib and interlock machines. In rib knitting, the needles of the cylinder are between the needles of the dial. In interlock gaiting, the needles of the cylinder are directly opposed to the needles in the dial (opposed to each other).
Timing - the order the needles in the dial and cylinder go through the kn*itthg cycle in relationship to one another. The cylinder needles that correspond to dial needles may go through the knitting cycle before or after the dial needles.
Dial Height -.the distance between the bottom edge of the dial section on a hitting machine at its perimeter from ‘the corresponding upper edge of the cylinder at its perimeter.
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Tricot - a type of warp knitting in which spring beard'd needles are normally used to make fine fabrics with usually one to three warps are used.
Raschel - a type of warp knitting in which plain and jaquhrd fabrics can be made. Raschel fabrics are normally coarser than other types of warp knits, but a wide range of fabrics can be made. Raschel machines may have one or two sets of needles and up to thirty guide bars. ".. .."" . .... ". .-.
Gauge - the number of needles per linear inch of the needle bar. For most warp knits that refers to a one linear inch, but can be for two.
Guide Bar - a mechanism on a warp knitting machine .(;hkh directs warp yarns to the knitting needles, and their movement is controlled so that patterns can be knit.
Needle Bar - a flat metal plate with slots (tricks) cut into it at regular intervab into which needles slide during the knitting process.
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Runner Length - in warp knitting the number of inches of yam needed to knit one rack o i fabiic.
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Rack - a warp knitting measure of 480 courses. Tricot fabric quality is judged by the number of inches per rack.
Inch Quality - a measure of quality of warp knit fabric, the number of inches of fabric per rack.
Full Set - a term that indicates that all guide eyes in a guide bar each have a yam- from d.
the warp. . -. . . . , . . . , . . .. . . . .
Part Set - a term that indicates that all guide eyes in a guide bar do not have a yam from the warp.
Positive Feed - when the yam is metered off the warp beam by a metering device.
Negative feed - when the yam is pulled off the warp beam by the knitting action of the needles during the loop forming step.
Pattern Wheel - a cylinder or wheel upon which a pattem chain is placed which has links of different heights so as to move the guide bars throughout its pattem.
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Figure 9-15 Tuck Stitch Formation
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Figure 9- 16 Float Stitch Formation
Float Stitch Formation
Wmng Fmdamentals 9-25
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Effects Of Tucks And Floats On Knitted Fabrics
Tuck LOOD Makes the fabric wider
Makes the fabric thicker
Makes the fabric slightly less extensible
Float LOOD Makes the fabric narrower
Makes the fabric thinner
Makes the fabric much less extensible
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Figure 9- 17 Cylinder and Dial
Wmng Fmdamentds 9-27
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Figure 9-18 1 x 1 Rib
Face Back Wale W e
9-28 Knltthgfbndamentab
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Figure 9- 19 Rib Gaiting
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Weft Knitting Notation
Verbal 1 x 1 Rib - Fabric made with face loops and back loops alternating in same course but not same wale. Made on dial and cylinder machine with rib gaiting.
Svmbolic 1 X l R b m
Graphic
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Diaerammatb
F d 1
C "446 1 X l R b
D & C
S L
9-30 KrJttingFundamentab
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2 x 2 Rib
Machine Reauirements A rib machine. Only one came race and one type of needle for the cylinder dial. Rib gaiting
Needle Setout Needles not knitting must be removed from the machine
Needle Selection All at every feed
Fabric Pronedies A one feed repeat. Same appearance on both sides. Good crosswise extensibility.
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Knitting Fundamentals 9-31
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Figure 9-20 Interlock
9-32 Knlmng Fundamentals
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Knlmng Fundamentals 9-33
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Figure 9-22 Interlock Gaiting
9-34 KnltHngFundamentab
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Interlock
Machine Reauirements An interlock or eightlock machine. Long and short needles in both the cylinder and dial. Interlock gaiting and usually delayed timing.
Needle Setout Needles alternately arranged long and short in the cylinder and dial.
Needle Selection Dial Needles Cvlinder Needles Knit short Knit short Knit long Knit long
Fabric ProDerties A two feed repeat. Same appearance on both sides. Tight and stable construction. Does not curl.
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Ponte Di Roma
Machine Reauirements An eightlock machine. Long and short needles in both the cylinder and dial. Interlock gaiting (Rib gaiting can also be used) and usually delayed timing.
Needle Setout Needles alternately arranged long and short in the cylinder and dial.
Needle Selection Dial Needles Cvlinder Needles Knit short Knit short Knit long Knit long Miss all Knit all Knit all Miss all
Fabric ProDertieg A four feed repeat. Same appearance on both sides. Tight and stable construction. Does not curl.
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Feed 1
Feed2
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Figure 9-23
-Bed-
Knitting Fundament& 9-37
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Figure 9-24 'V Bed Rib'
9-38 KnlltingFundamentals
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Properties Of Weft Knits
Stretch and recovery
Wrinkle Recovery
Thickness
0 Air Permeability
0 Shrinkage
Snagging
Pilling
Curling
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Figure 9-25 Warp Knitting
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Figure 9-26 Diagram Of A Typical Tricot Machine: The Front Is At Right
WtthgFundamentals 9-41
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Warp Knitting
It Basic W a n Terminolom A
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Tricot
Rachel
Guage
Guide Bar
Needle Bar
Runner Length
Rack
Inch Quality
Full Set
Part Set
Positive Feed
Negative Feed
M. Pattern Wheel
I& Basic Warm ff i i t Actions
k Spring Beard Needle
B. LatchNeedle
- - C. CompoundNeedle
9-42 KnlMngFmdamentalp
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1 I
I A D e s i m Variables t
k Yam Characteristics
B. Threading
C. Underlap Length and Position
D. Number of Bars
E. Fabric Enhancement
Fabric Classifications
A OneBar
B. TwoBar
C. ThreeBar
D. MultipleBar
- V. Warm Knitted Fabric Notatioe
k Verbal
B. Graphic
C. Numerical
D. Diagrammatic
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KnrmngFmdamenMs 9-43
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Figure 9-27 The Bearded Needle
Eye Or Gmve
Stem
_-
Butt
9-44 WttingFundanentab
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Figure 9-28 Compound Needle
. . . . : : : : : ‘ a :
: ’ 1 :
: : * : : : : : : : : ; * :
i :
. . I :
U
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Comparison Of latch Needle and Spring Beard Needle
Latch Needle SDrine Beard Needle Latched Not latched
Self-closing To be closed
Formsloop .
Expensive Cheaper
Coarser Finer
b w needles per inch
Requires help to form loop
More needles per inch
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Figure 9-29 Lapping Movements
. . * . $?to 0 . . 0 . . . 0 . . e .
3.58a 3.- 3.58c 3.586
3.-
. . 0 .
0 0 . .
3.m
‘5 0 . -
.
36th 3 . m
Knlttlng FU7damentals 9-47
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- -
Figure 9-30 Tricot Machine Knitting Action
9-48 KnlmngFundamentalp
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I
0
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I A
4
9-50 KnltHngFundamentak
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b WMng Fmdamentals 9-51
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Figure 9-31 Half Tricot Structure
. . *
1-0 $ . 1-2
2 1 0 1 - 2 A - O
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Figure 9-32 Two Bar Fabrics
B.G.B. F.G.B.
4.T
B.G.B. F.G.B.
KnlttlngFundamentals 9-53
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Tricot Jersey (Full Tricot)
Front Bar Back Bar
Locknit Front Bar Back Bar
Reverse Locknit Front Bar Back Bar
LOOD Raised Front Bar Back Bar
Sharkskin Front Bar Back Bar
Satin Front Bar Back Bar
OR Front Bar Back Bar
Bueenscord Front Bar Back Bar
OR Front Bar Back Bar
Standard Two Bar Fabrics
1-2/1-0/ 1-0/1-2/
2-3/ 1-O/ 1-0/1-2/
1-2/1-0/ 1-0/2-3/
1-0/3-4/ 1-0/2-3/
1-0/1-2/ 3-4/1-0/
34/1-01 1-0/1-2/
4-5/1-0/ 1-0/1-2/
l-O/O-l/ 341-01
l-O/O-l/ 4-5/1-01
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P v)
Knltthgkndam
entab 9-55
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Wm
ng Fmdam
entals 9-57
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Figure 9-33 Diagram Of A Knitted Net
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Figure 9-34 Diagram Showing Laying In Yarn to Form Designs: Some guide bars are left empty.
Knlmng Fundamentab 9-59
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Characteristics Of Warp Knit Fabrics
Extremely versatile in pattern effects with yarn
Rigid to elastic
Cannot be raveled
Good air and water permeability
Good crease resistance
Good drapability
Good dimensional stability
Goodstrength 'L
9-60 Wttlnghmdamentab
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