Article on Weft Knitting

Report
Presentation on
Weft Knitting Machine
(Single Jersey, Rib &
Interlock)
Presented by
▪ Name with ID:
–
–
–
–
Shawan Roy (023)
Ahmmed Sharjin Sharif (024)
Pankaj Roy (025)
Kohinur (027)
▪ Textile 5th Intake
▪ Section 1
▪ Bangladesh University of Business
& Technology
What is fabric?
▪ Manufactured assembly of
interlacing or interloping fibers,
filaments, and/or yarns having
substantial surface (planar) area in
relation to its thickness, and
adequate mechanical strength to
give it a cohesive structure.
▪ Most fabrics are knitted or woven,
but some are produced by nonwoven processes such as braiding,
felting, and twisting.
▪ We are generally using weaving
and knitting to make fabric.
What is knitting and knit fabric?
▪
Knitting is a method by which thread or yarn is
used to create a cloth.
▪
Knitted fabric consists of a number of consecutive
rows of loops, called stitches.
▪
As each row progresses, a new loop is pulled
through an existing loop.
▪
The active stitches are held on a needle until
another loop can be passed through them.
▪
This process eventually results in a fabric, often
used for blankets or garments.
▪
Fabrics made from only one set of yarns, all
running in the same direction. Some knits have
their yarns running along the length of the fabric,
while others have their yarns running across the
width of the fabric.
▪
Knit fabrics are held together by looping the yarns
around each other.
Types of knitting
▪ There are two types of knitting
– Weft knitting
– Warp knitting
▪ Weft knitting: Weft knitting is a
method of fabric forming in which
loops are formed in a horizontal way
from a single yarn & intermeshing of
loops takes place in a circular & flat
from on across wise basis.
▪ Warp knitting: Warp knitting is a
method of fabric forming in which the
loops are formed in a vertical way
along the length of fabric from each
warp yarn & intermeshing of loops
takes place in a flat from of length
wise basis.
Classification of weft knitting machine
▪ According to the frame design
& needle bed arrangement.
– Circular knitting machine
– Flat knitting machine
Classification of weft knitting machine
▪ According to the no. of needle
bed.
– Single jersey circular knitting
machine
– Double jersey circular knitting
machine
Classification of weft knitting machine
▪ According to the end product
of the weft knitting machine.
– Fabric machine
– Garments length machine
Classification of weft knitting machine
▪ According to the basic
structure of the weft knitting
– Plan or single jersey circular
knitting machine
– Rib flat or circular knitting
machine
– Interlock flat or circular knitting
machine
– Purl or link-link flat or circular
knitting machine
Classification of weft knitting machine
▪ According to the type of needle
use.
– Knitting machine equipped with
latch needle
▪ Circular knitting machine
– One needle bed (Single jersey knitting
machine)
– Two needle bed (Rib or interlock knitting
machine)
– Double (Purl knitting machine)
▪ Flatbed knitting machine
– One needle bed
– Two needle bed (V-bed flat knitting
machine)
– Knitting machine equipped with
spring breaded needle
▪ Circular knitting machine
▪ Straight bar frame
Feature of single jersey circular
knitting machine
▪
Single jersey circular knitting machine has
normally rotating (clockwise) cylindrical one set of
needle bed.
▪
Generally latch needles are used.
▪
Generally machine needles gauge is 24. It can be
various from 10 to 36 for producing finer or coarser
fabric.
▪
For Single Jersey machine, holding down sinker
are used, one between every needle space.
▪
Latch needle cylinder & sinker ring revolve
through the stationary knitting cam.
▪
For single jersey machine, sinker trick ring is
simply & directly attached to the outside top of
needle cylinder.
▪
Stationary yarn feeders are situated at regular
intervals around the circumference of the rotating
cylinder.
Feature of rib circular knitting machine
▪ In rib circular knitting machine,
there are two needle bed. One set
of needles are mounted on a
vertical cylinder & other set of
needles are mounted on
horizontal dial.
▪ The cylinder and dial needles are
rib of gaiting (the dial needles are
midway between the cylinder
needles).
▪ Both cylinder & dial needle bed
should have two types of needle
(short & long needles).
▪ Generally needle gauge is 18.
Feature of interlock circular knitting
machine
▪ In interlock circular knitting
machine, there are two needle
bed. One set of needles are
mounted on a vertical cylinder &
other set of needles are mounted
on horizontal dial.
▪ The cylinder and dial needles are
interlock of gaiting (the dial
needles are face to face between
the cylinder needles).
▪ Both cylinder & dial needle bed
should have two types of needle
(short & long needles).
▪ Generally needle gauge is 20.
Brand & origin for circular knitting
machine
Brand
Origin
Orizio
Fukahama
Terrot
Teinyang
Well Knit
Fukahara
Mayer & cie
Hanma
Hupter
Jiunn long
Masa
Dong ho
Jinhar
Pailung
Lisky
Tayo
Zentex
Italy
Taiwan
Germany
Taiwan
Taiwan
Japan
Germany
China
Taiwan
Taiwan
Taiwan
Taiwan
Taiwan
Taiwan
Taiwan
Taiwan
Singapore
Main parts of knitting machine &
function
▪ Needle
– Needle is a tiny hocked elements
used for loop formation.
– Needle used for knitting are three
types
▪ Latch needle
▪ Spring bearded needle
▪ Compound needle
– Function:
▪ To feed yarn.
▪ Loop formation.
▪ To hold the old loop.
Main parts of knitting machine &
function
▪ Cam (knit, tuck, miss)
– Cam converts the rotary machine
drive into suitable reciprocating
action for the needles or other
elements
– Each needle action is obtained by
means of cams acting on the
needle bed
– Three types of cam. (knit, tuck,
miss)
– Help to produce knit, tuck & miss
loop.
Main parts of knitting machine &
function
▪ Sinker
– Sinker is a thin metal plate which is
placed at right angle between the
adjoining needles.
– Sinker are tree types
▪ Holding down
▪ Loop-pulling
▪ Knock-over
– Sinker is used in single jersey circular
knitting machine.
– Function:
▪ Loop formation.
▪ Holding down.
▪ Knock over the surface. Where its
upper surface or belly supports the old
loop as the new loop is down through
it.
Main parts of knitting machine &
function
▪ Dial
– Dial is a upper steel needle bed
used in double knit machine.
– In the groves of dial the needles
are mounted horizontally & are
also to move radially in & out by
their dial cam sinker used here.
– Dial is used in double jersey (rib or
interlock) circular knitting machine
Main parts of knitting machine &
function
▪ Creel
– To hold the cone holder.
▪ Cone holder
– To hold the package.
▪ Plastic tube
– To pass the yarn.
▪ Positive feeder
– To storage the yarn.
– To pass the specific amount of yarn
by driving unit.
▪ Storage unit
– To storage the yarn in storing unit.
Main parts of knitting machine &
function
▪ Indicator light
– To indicate any problem of machine.
▪ Magnetic type tensioner
– To create tension in feed yarn
▪ Cylinder
– To hold the needle.
▪ Feeder
– To feed the yarn to needle
▪ Cam box
– To hold the cam.
Main parts of knitting machine &
function
▪ Sinker ring
– To hold the sinker.
▪ Fabric spreader
– To change the circular to flat shape of
fabric.
▪ Fabric take down roller
– To take down the fabric.
▪ Sensor
– To identify the breakage of yarn.
▪ Dust removing fan
– To remove the dust.
▪ Needle detector
– To identify the needle breakage.
Main parts of knitting machine &
function
▪ VDQ (Variable diameter for quality)
pulley
– To control the GSM.
– It gives motion to the positive feeder
– Diameter of VDQ ↑ ↔ Speed of Tooth
belt ↑ ↔ Speed of yarn feeder ↑ ↔
Loop Length ↑ ↔ GSM ↓
– Diameter of VDQ ↓ ↔ Speed of Tooth
belt ↓ ↔ Speed of yarn feeder ↓ ↔
Loop Length ↓ ↔ GSM ↑
▪ QAP (Quality Adjustable pulley)
pulley
– To adjust tooth belt tension.
– To adjust the quality of fabric.
Main parts of knitting machine &
function
▪ Toothed belt
– To transfer the motion from VDQ
pulley to positive feeder
▪ Motor
– To produce the motion the
machine.
▪ Lubricating system
– To pass the lubricating oil in the
machine.
Main parts of knitting machine &
function
▪ Sensor
– To identify the breakage of yarn.
▪ Cam for sinker
– To more the sinker is machine.
▪ Yarn guide
– To guide the yarn.

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