Bdft ii, types of knitting & knitting machine , tmt, unit-ii
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Transcript of Bdft ii, types of knitting & knitting machine , tmt, unit-ii
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Lecture # 6
knitting fundamentals
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Knitting Fundamentals
Knitting Definition
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Knitting is one of several ways to turn thread or yarn into cloth. Unlike woven fabric, knitted fabric consists entirely of horizontal parallel courses of yarn.
The courses are joined to each other by interlocking loops in which a short loop of one course of yarn is wrapped over the bight of another course.
Knitting can be done either by hand, described below, or by machine. In practice, hand knitting is usually begun (or "cast on") by forming a base series of twisted loops
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Knitting is a process in which one thread is used to make loops and then newly formed loops are passed through previously formed loops and top and bottom loops are joined with the help of head and feet
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Lecture # 7
Knitting Fundamentals
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Knitting Fundamentals
Basic Elements in knitting is
Stitch or Course
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Stitch Details
loop Loop insertion through loop Joining of two loops Knitted fabric flexibility depends upon loop
structure Loops have many shapes and types
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Loop
An extended portion of a regular string Has no end It is part of main string Have balance shape Is made with the help of any tool which is able
to pull the string from a certain point
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Loop Insertion
Loop is inserted through an other previously held loop with the help of needle
Needle should have the ability to hold fresh loop during insertion period
Needle is responsible to make new loops and hold the previous sloop
Loop insertion Animation Knitting Cycle
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Website address for knitting cycle
exeltor.com/.../index. php?ss=3&sss=1&stage=3
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Lecture # 8
Classification of knitting
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Knitting Classification
Based upon Knitting Procedure
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Warp and Weft
Warp Knitting Weft Knitting
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Warp Knitting
In this process yarn sheet is developed (warp sheet) and then with the help of needles stitches are formed by insertion new loop into old loop.
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Warp Knitting Machine
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Warp Knitted Fabric
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Weft Knitting
In weft knitting single yarn is fed to knitting needles. Needle with the help of cams, sinker make a new loop and passed it into previously held loops.
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Types of Weft Knitting
Circular Knitting and Flat Knitting
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Circular Knitting Machines
In circular knitting machines needles are fixed on a cylinder or dial in a circular shape.
There are more than one feeders to feed yarn to needles at different places.
In most of the cases needle bed (cylinder or dial) moves while feeders remain stationary.
Diameter of cylinder and dial is fixed but in case of sock knitting machines it is changeable due to structure of socks
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Circular Knitting Machine
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Flat Knitting Machines
In flat knitting machines needles are fixed on a straight plate. On this machine needle bed remains stationary while yarn feeding system called carriage moves from one end to other end
This machine is used to knit collars, arm bands and sweaters
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Flat Knitting
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Types of Circular Knitting Machines Single Knitting Double Knitting
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Single Knit Machine
In these machines needles are fixed on cylinder and sinker are fixed on sinker ring. Needles knit with the help of sinkers.
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Single Knit Machine
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Double Knit Machine
In double knit machine needles are fixed on dial as well as on cylinders. There is no sinkers on this machine.
This machine is used to knit interlock, rib and double jerseys
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Double Knitting
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Double Knit Fabric
Interlock--- Two sides are fully knitted, highly flexible used for under garments. Front and back wales are exactly at same point
Rib--- two sides are fully knitted. Less flexible but have strong grip, used for neck, cuff opening and waist band. Front and back wales are not at same point
Double Jersey Double side knitted, can have different designs on
both sides
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Interlock Machine
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Double Knit Jacquard Knitting Machine
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Types of Single Knitting Machines Plain knitting Loop knitting
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Single Knit Plain Knitting Machines Mostly called jersey machines. On this
machines, there is a set of needles and sinkers. These machines may be single track of multi track. From one track to six track machines are available.
These machine can knit jersey, pique, honey comb, mini jacquard
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Single Plain Knitting Machines
Single Track Multi Track
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Single Track Single Knit
Track means number of cams vertically fitted In single track machine there is only one track This machine can knit only full knit fabric
(single jersey)
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Multi Track Knitting Machine
In this machine there are 2-6 tracks More number of tracks means that variety of
designs can be produced On these machine many types of fabric can
be produced, like, pique, pique fleece, two thread fleece and mini jacquard
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Loop Knitting Machines
In these machines we can make loop on one or on both sides of fabric.
By introducing loops we can increase the weight and bulkiness of fabric
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Types of Loop Knitting Machines
Terry Fleece
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Terry Fabric
This fabric has loops on the surface, like towel but the length of loops is smaller than towels. Normally used to make shirts of kids or for people working under high temperature to absorb the moisture
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Terry Knitting Machine
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Terry Knitting Machine
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Single Jersey Double Face Fabric
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Three Thread Knitting Machine
This machine is used to produce fleece fabric. This fabric is plain from one side. Mostly front side is of single jersey and on back loop is inserted across various number of wales (normally two to three wales are covered).
Back side is brushed with the help of raising machine to make it more comfortable and bulky as well as warm
Two types of threads are used; fine for the top and course for back ( 30/16, 28/12 etc)
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Three Thread Fleece Machine
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Fleece Fabric
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Striper
In stripe knitting machines we can produce horizontal stripes with the help of scissors which cuts the yarn and a new yarn is fed
There are two types of: Mechanical Electronic Note: in current era there is no fresh
production of mechanical strip machines
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Stripe Knitting Machine
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Jacquard Knitting Machines
These machine are available in single and double knit technology
Normally more than one colored yarns are used.
Different patterns are made Normally 4-6 color machines are available
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All types of machines can be converted into jacquard machines
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Jacquard Machines
Mechanical Jacquard Electronic Jacquard
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Jacquard Fabric
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Flat Knitting
Single bed Double bed
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Full Garment Flat Knitting Machines
These are latest machines and are used to make full length of garment
Quite expensive Not in Pakistan Required in countries where labour is
expensive
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Gloves Knitting Machine
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Gloves Knitting machines
In this machine bed rotates and carriage moves from one side to other
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Lecture # 9
Warp knitting
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Warp Knitting
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Types of Flat Knitting
Raschel, made with latch needles, Tricot, using bearded needles.
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Warp-Knitting When producing warp-knits, a yarn sheet is
linked by stitches in longitudinal direction. Thus, each individual thread in the sheet (warp) forms a wale.
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Warp Knitting
Main products Nets Curtains Technical fabrics Covers Covering sheets
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Working Principle
Warp sheet Loops development with the help of needles Loops insertion with the help of needles Needle movement controls mechanically and
electronically
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Properties of Warp Knitted Fabric
More stable than knitted Big and small holes are possible Many designs are possible Highly course yarn can be used Technical fabric can be produced
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Use of Warp Knitted Fabric
Use to fulfill technical demands, like, filters, seat covers etc
Used as curtains, table covers Used as Chadar in Pakistan Not used for clothing
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Warp Knitting Industry in Pakistan Very small number of mills, mainly in
Gujranwala One or two in Lahore