TRANSFER PRINTING
TRANSFER PRINTING
NAME: MOHAMMAD EHSAN SAEEDTEACHER NAME: MISS NAVETA SUBJECT :
TEXTILE PRINTINGDETERMINE THE TRANSFER PRINTINGTransfer Printing in
Textiles involves transferring the design on a paper to a fabric by
vaporization.
There are two main processes for this; the first one is Dry Heat
Transfer Printing ,Melt Transfer printing and Wet Transfer
Printing.
METHODS OF TRANSFER PRINTINGSublimation Transfer.Melt
Transfer.Wet Transfer
Sublimation Transfer.
Sublimation Transfer : Here use volatile dyes. Dye is adsorbed
from the vapour phase. In the first step the paper which the
printing is done needs to be printed first. For that, collect the
paper, make the print paste, print the paper and dried it at low
temperature. In the seceond step, Sublime the paper and diffuse it
with condensation. Diffusion again into the interior of the fiber
of the fabric.
.Melt TransferIn melt transfer design is printed on paper using
a wax link. A hot iron is applied to its reverse face and presses
the paper against the fabric. When the pressure is applied the ink
melts and starts printing.
Wet TransferWater soluble dyes are incorporated into a printing
ink. Transferred to a moistened textile aqueous medium and printing
is done.
Types of Transfer Printing MachineThe machine based on transfer
printing are essentially hot pressing unit in which the temperature
is maintained in the desired range. The machine are of-Flat bed
transfer printing machineContinuous transfer Printing MachineVacuum
Transfer Printing Machine A short description is now describing
here giving the working procedure of each machine.
Flat Bed Transfer Printing Machine
Flat Bed Transfer Printing Machine It is suitable to print the
garmentIt is suitable to print both side of the fabricTime of
printing is settled to the machineThe number of printed garments
per hour is 50-100Heating is carried out by electricity or super
steam
Flat Bed Transfer Printing Machine Working Procedure :Inthis
machine working is carried out in three steps.At first fabric to be
printed is carried out to the endless blanketIn this step fabric
comes to the press bed and per-printed paper is placed on the
fabric in press bed. In this step, temperature keeps 180 to 200
degree centigrade normally and pressing time keeps 30-40 seconds by
a pair of cylinder with air.The press bed or heated plate is then
lifted and this printed fabric is stored by moving through blanket.
In the moment the another cycle is starts.
Continuous Transfer Printing Machine This machine design is
transferred from printing paper to fabric. After printing by this
machine no need of fixation or wet treatment.
Continuous Transfer Printing Machine Working Principle :In this
machine working is carried out as following steps.In this machine,
since preprinted paper and fabric contact to each other passes
through, design is transferred to fabric which is done in a biggest
heated cylinder.Here cylinder is heated at 220 degree centigrade
internally and design is transferred due to the pressure of
cylinder and preprinted paper.A tension device is used for pressure
of printing paper to fabricRequired time for printing is 15-60
sBacking paper is used for uniform pressure fabric and transfer
paper.The speed of machine is 1300 m/hrthe speed of machine varies
between 6-15 m/min depending on the diameter of the heated
cylinderVacuum Transfer Printing:Both continuous and unit transfer
printing machine have been redesigned to provide vacuum assisted
transfer. The drawing of dye in to the fabric from the printing
paper is achieved by means of vacuum produced in a cylinder the
cylinder is manufactured from a finely perforated steel mantle with
surface profile and perforation. Due to this even vacuum the paper
and the fabric are wrapped around the cylinder.Vacuum Transfer
Printing:Working Procedure:The steel mantle of the drum is covered
witha heat resistant padding material. The paper ususally extends
about 1 inch beyond each selvedge of the fabric. The projecting
edge of the paper are sealed off by adjustable perforated Teflon
tapes which reject the dyestuffs and protect the drum edge from
getting soiled. Heating is done by infra-red heating, filled in a
special reflecting chamber.
Advantages of Transfer Printing
The capital cost of the equipment is low.Space required is also
small.A skill printer is not required through careful control of
temperature and pressure.A clear and sharp definition of all
objects is possible.The proportion of sub-standard quantity is as
low as 20%Since the printed fabric does not required any after
treatment, it does not contribute to wter pollution problem.It
gives good prints on well prepared knitted goods.No adverse effect
on fabric's feel and luster.It allows excellent dye penetration
into the fiber ( because transfer takes place at very high
temperature).Steaming, Washing, drying etc are not
necessary.Quicker reaction to changes in fashionsDisadvantages of
Transfer Printing
There is some restriction of the production of deep shadeHigh
temp and pressure is requiredOnce printed cannot be correctedOnly
limited dyestuff can be used for transfer printingLower production
speed due to existing transfer calendarsStorage of large quantities
of paper over prolonged period of time is a risk.
Limitations of Transfer Printing
Not applicable to all fiber specially which cannot stand under
required temperature and pressure.The print paper is not
available.
THE END
