challenges faced by digital printing industry.
These can be summarized as: cost, convenience of technology, nozzle, personnel training, head and pigment printing.
Cost the cost of this technology is the main obstacle to the progress of this technology, because compared with digital printing, the technology available in the market is cheaper.
However, the industry offers a lot of appeal, especially for the highendmarket.
The closest comparison is the flat panel printing technology, which can reduce the dye and chemical cost of Rs.
The cost of the reactive dye is about £ 15 per square meter, while the digital printing ink is about Rs. 75 per sq/m.
The cost of funds is also high.
However, in the near future, the cost will drop and the replaceable parts will become more affordable.
This, combined with the speed of the machine, will force the printer to replace the rotating printing machine.
In addition to the cost of ink, the main consumables that affect the cost of this technology are print heads.
Therefore, the development of durable head with long life is a prerequisite for long-term cost reduction.
These technologies have been improved over the past five years, but it has not yet reached a stage beyond the existing conventional technologies in the market. In the single-
Gray and solid spots need to be improved through technology.
New size and hardware technology are required for the head.
Pigment printing needs to be solved in depth, as this will set off a revolution in the field of textile printing, as 85% of traditional printing still uses pigments.
Pigment ink needs to be cycled through an extensive RandD.
It may be the development of block polymers of polyurethane and acrylic ester, or the addition of positive electricity to textiles may improve the adhesion of pigments.
NozzlesThe nozzles need to be modified specifically for pigment printing, because the size of pigment particles is larger than that of dyes, so they can easily plug the nozzles.
It is essential that the size of pigment particles be reduced without compromising aesthetic properties.
For example, the main problem with reducing the particle size to less than 1 micron is the decrease in color yield and shadow brightness.
Success can only be achieved if pigment chemistry and nozzle engineering are treated simultaneously.
The solvent, such as the solvent, may play an important role in the pigment ink in time.
Personnel training on maintenance and maintenance of machines and hardware will play a very important role in promoting this technology.
In the face of these challenges, we must understand the different mechanical devices and parts of the machine.
Digital textile printers were launched in the 1980 s, and in the 1990 s each year, prices became more affordable, attracting traditional textile printing markets for commercial printing.
In addition to the price, there are positive and negative aspects that can be summarized as follows: the level of flexibility varies from direction to direction.
Different varieties of synthetic fibers and their compatibility with various dyes have brought about the problem of ink replacement and also affected the performance of the head.
Behavior of stretched fabric, highly porous and textured surfaces.
The firm performance of printing.
Design needs to be developed for digital format.
Design and color management software, ink, fabric pretreatment, post-processing
Treatment and all surgery are important factors.
Lower energy, water, short-term operation, complete elimination of screens, less space, material consumption and environment are positive points.
In the case of a digital printer, liquid ink of various colors is sprayed onto the textile without the need for actual contact to print out the height
The print head scans the fabric in the horizontal stripe by moving from left to right and back, while the fabric rolls up in vertical steps.
The water droplets that pop up are a child
Micron size much smaller than human hair diameter. One sq.
The printing instrument may contain more than 20 billion droplets;
Positioning must be very precise in order to achieve a resolution of 1400x1400 points per inch (DPI).
The number and results of the head describe the speed of the machine;
This can only be achieved by ink prepared using nanotechnology.
There are two types of head technology in terms of inkjet printers.
CIJ drops continuously on demand for inkjet or mod.
In continuous inkjet, droplets are continuously generated by the charge applied to them.
Spray charged droplets from the nozzle.
Charged droplets are either directed to the textile for printing or directed to the recycling system.
Because droplets are continuously produced, they are directed to textiles only when a point is needed.
Hertz CIJ is the foundation of byStork\'s first commercial digital textile printing system (Now SPGPrints)
In 1991, the print head technology of Osiris was used.
In the Defense Department system, ink will be ejected from the print head only when needed.
In the Ministry of Defense, the head is driven by the piezoelectric system PIJ, where the ink is forced by a piezoelectric actuator from the print head through an extrusion mechanism or a thermal mechanism.
In this system, the electric heater inside each nozzle is used to quickly increase the temperature of the ink, resulting in the expansion of the steam bubble and allowing the ink drop injection.
Inkjet Printing Machine Head and its technology the most common inkjet printing machine head used in the current popular digital textile printing machine is as follows: Epson DX5 (
Mimaki JV33, Mimaki JV5). Epson DX7 (
Roland XF Mutoh 1683. 640). Seiko 508 GS (FlexJS-BT-
180, Ichinose 2030). Ricoh Gen. 4 (d.
General Mimaki TX 400 tyrios Grande). Ricoh Gen 5 (Mimaki TX 500). Konica KM512 (
Konica Minolta Nasser VII). Kyocera Kj4B (
Raario MS JP6, rainiani Renault MS). Precision core (MEMS)Technology. Fuji Samba (MEMS). Zaar 5501.
The difference in print head technology comes from the configuration of different print heads, such as: the width of the print head varies from 25mm to 108mm.
A large print head increases the speed of the machine by replacing more fabric on each scan print rack.
In addition, the speed can also be increased by increasing the number of pH values.
Channels and nozzles: the print head has different channel configurations in order to adapt to different inks.
Each channel has a specific nozzle that affects the resolution of the print, because the nozzle density can be as high as 2048/ 43mm PH, as is the case with the Fuji print head deployed by spgpints. Frequency (KHz)
: The number of drops per second directly affects the sprint speed.
Minimum drop size (Picolitre)
: The print head is able to produce variable drop sizes, and small drop sizes provide finer details at the expense of print speed.
The size of a single ink drop directly affects the overall output quality.
In general, small drops can produce good clarity and higher resolution, suitable for textures, while large drops can quickly cover large areas, which is conducive to printing large flat areas.
A lot of people use the binary method because it is faster, so every drop is the same size.
Another way is to change the size of the ink drop, a technique commonly referred to as grayscale printing.
There are a lot of benefits to doing this, such as mixing smaller and smaller drops of water to handle gradients and slight tone changes more easily.
Fuel consumption is also saved in addition to soft tones, as small fonts can provide higher print coverage and reduce jitter.
There are three basic methods.
The first one is actually to determine the different sizes by changing the electricity used to produce the water droplets.
Secondly, one can light up a very heavy drop of ink, and when it flies in the air, the ink sticks out and breaks down into larger, smaller drops of ink.
Third, the latest alternative is called multi-pulse, which includes a quick ignition of two drops of ink and then merging into a single drop of ink, usually flying before they hit the substrate.
Most print heads use a combination method.
To calculate the productivity of the print head, we can apply Ross Allen from HP.
Among them, A = area filling rate. (
Inches per second)N= Nozzles. F= Drop rates. (Hertz)
R = print resolution. (dpi)
However, this suggests solving the problem, if you double the result from 360 to 720 and keep the frequency and number of sounds unchanged, the productivity will be reduced by 4 times.
The mechanism of printing depends on two principles.
Pass or scan and singlepass Scanning.
Multiple passes: multiple
When the slide frame passes through the width of the fabric, the pass or scan fabric is fixed, and once it returns to the starting position, the fabric moves one step forward.
One way: in one way, the print head is mounted on the entire width of the fabric, one stacked print headline per color, under which the manufacturer moves at a constant speed.
The image is built on a vertical line.
Is Lario MS a business example of this system?
2015 also appears in Pakistanimarket.
EFI aki, EFI, duster?
Reggiani is also sharing.
Kornit shows their latest version in Fespa 2018.
The range of digital printers is very promising, because the cost of head sand ink may be significantly reduced, and the technology will attract printer adoption as soon as possible.
The Pakistani market is a bit slow to adopt this technology because they are mainly printed on cheap print-offs, and the only local market is the cost of support.
Market trends suggest that the printing market will be flooded sooner or later. ReferencesDR.
John Frost, spgprs INTs, MS Lario, duster and Visse cahels.