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Digital printing can replace silk screen printing?

In recent years, the fast development of digital printing, may have a potential of alternative screen printing. What are the differences these two kinds of printing technology, how to understand and choose? The following for your detailed analysis of the interpretation of digital printing and screen printing technology characteristics and development prospects.

Printing is refers to the use of dye or formed by coating on the fabric surface. Since the printing technology development, has formed a silk screen printing, rotary screen printing, roller printing, digital printing, and other form of printing process and coexist with each other. Different application scope of all kinds of printing process, process characteristics vary, the use of printing equipment and consumables are also different. Silk screen printing as a classic traditional printing technology, its application range is very wide, a relatively high proportion in the printing industry, and digital printing is booming in recent years, many people feel that there will be alternative to the trend of the silk screen printing. What are the differences between these two kinds of printing process? In the analysis of the difference between digital printing and screen printing.

Types of substrates

Digital printing, digital printing can be divided into acidic active scattered digital printing, digital printing, thermal transfer printing digital printing five categories and dispersed direct injection. Acid digital printing ink is suitable for the wool, silk protein fiber, nylon fiber fabric, etc. Digital printing reactive ink is mainly suitable for cotton, linen, viscose fiber and silk fabrics digital printing, can be applied to cotton fabric, silk fabrics, wool fabrics and other natural fiber fabrics digital printing. Digital printing ink coatings suitable for cotton fabric, silk, chemical fiber and blended fabric, knitted fabric, sweaters, towel, blanket of digital ink jet pigment printing. Digital printing is suitable for polyester, non-woven fabric, thermal transfer ink ceramic material such as transfer printing. Digital printing ink direct injection dispersion is suitable for polyester fabric, such as decorative cloth digital printing, flags, banners, etc.

Compared to the traditional screen printing on the types of substrates digital printing and there is not much advantage. Is a traditional printing printing format size limitations, large industrial digital inkjet printer ink jet up to a maximum of 3 ~ 4 meters, the width is not continuous printing, unlimited length, they can even form the whole production line; Second, the tradition in some materials, water-based ink printing can't achieve better performance, therefore can only use solvent ink to printing, and digital printing on any material can use water-based ink for inkjet printing, so to avoid the extensive use of flammable and explosive of environment-friendly solvent.

Digital printing color is more bright-coloured

Biggest advantage of digital printing are mainly concentrated in the fine degree of colour and pattern. First of all, from the color, the digital printing ink can be divided into the dye ink and pigment ink, dye the colourful, superior to paint. Digital printing, active acid scattered digital printing, thermal transfer printing and dispersed direct injection is the dye type should be used in digital printing ink. Digital printing is using the pigment as the colorant, but its use is nanoscale pigment paste. Specific ink, as long as be the ICC curve, form a complete set of special colours can reach the limit. Traditional screen printing color, one is based on the four color dot colours, 2 it is to rely on to control before printing ink color, color force than digital printing. In addition, digital printing, ink pigment is a nanoscale pigment paste, dye for water-soluble dye ink and even distributed heat sublimation transfer printing ink, pigment is the nanoscale.

Digital printing fine degree of design related to inkjet print head characteristics, the printing speed. The smaller drops of ink-jet printing head, printing precision is higher, among them with epson micro piezo print head drops to a minimum, industrial although drops is bigger than its head, but also can print 1440 dpi precision image. In addition, the same printer, the printing speed faster, the smaller the printing precision. Silk screen printing to the need for plate making, film of the error in the process of plate making and screen mesh on the degree of detailed design. In theory, screen aperture as small as possible, but ordinary screen printing more use of 100 ~ 150 purpose, four color dot mesh to 200 mesh. The higher the mesh, water-based ink screen blocking probability, the greater the this is a common fault. In addition, scraping the print on the accuracy of the version of the strong impact on the degree of fine printing design, printing machine is relatively better, but it is difficult to control manual printing.

The color and fine graphic is not the advantage of silk screen printing, special printing material, its advantage is, such as gold, silver, pearl color, effect of crack and tipping flocking effect, suede, suede and so on. In addition, screen printing can print 3 d effect, these are the current digital printing is difficult to achieve. In addition, the digital printing to make the white ink is difficult. The main dependence on imported ink, white ink printed on dark fabric, however, there is no white is no good, this is the current domestic popularization of digital printing needed to break through the difficulty.

Digital printing soft silk screen printing color fastness

Printing products main performance includes superficiality, namely feel (soft), viscosity, friction resistance, color fastness, soaping fastness; Environmental protection, that is, whether the formaldehyde, azo, pH, carcinogenic aromatic amine, phthalic acid ester, etc. GB/T 18401-18401 "national textile product basic safety technical specifications" to the above listed part of the project made specific provision.

Traditional screen printing, in addition to the water slurry discharge, and the other type printing coating are strong, this is because the printing ink formulation as a binder resin content is higher, and the ink quantity is relatively large. Basic no coating and digital printing, printing thin, soft, viscous back is better. Even coating of digital printing, due to the formula of resin content, the basic will not affect touch. Acidic digital printing digital printing, reactive, disperse digital printing, thermal transfer printing and dispersed direct injection which is without coating, does not affect the original fabric handle.

In both the traditional water-based printing ink and pigment printing ink, resin as binder, used to increase the coating and adhesive fastness of fabric on the one hand, make its not easy to crack and fall off after washing; Resin can package pigment particles on the other hand, the friction not easy discoloration. Traditional water-based printing ink and resin content in the pulp is 20% ~ 90%, usually is 70% ~ 80%, and digital printing ink pigment printing ink resin is only 10% contained. It is obvious that the theoretical analysis, digital printing fastness to rubbing, soaping fastness than traditional printing. Digital printing, in fact, without a certain amount of post-processing, its friction fastness is very poor, especially in the wet rubbing fastness. Although digital printing fastness to soaping according to GB/T 3921-3921 textile products testing the fastness to soaping fastness, through tests can sometimes, but compared with the traditional printing washing fastness, there are still some distance. At present, the fastness to rubbing and soaping fastness in digital printing still need further exploration and breakthrough.

Digital printing equipment cost is high

Digital printing used by the printer there are mainly three kinds of types. A tablet is EPSON desktop machine modification, such as EPSON t-50 modified tablet, this kind of machine is mainly used to make minor surface coatings ink of digital printing production, the type of purchase cost is much cheaper than other models. 2 it is loading EPSON DX4 / DX5 / DX6 / DX7 series printer ink-jet printing head, of which the most common, and DX5 DX7 as MIMAKI JV3-160, 1604, 1624, 7080, EPSONF MUTOH MUTOH EPSON S30680 etc., these models each printer costs about 100000 yuan to buy. At present, DX4 print head the market price is RMB 4000 each, DX5 print head the market price is 7000 yuan, each DX7 print head the market price is 12000 yuan each. Three is industrial inkjet printing machine, which represent machine have Kyocera Kyocera industrial digital printing machine nozzle, seiko SPT nozzle digital printing machine, konica digital printing machine industry nozzle digital printing machine, SPECTRA nozzle, etc., the printer buy generally high cost. Each brand of the print head a single market price is in 10000 yuan of above, and a print head spray print only one color. That is to say, if you want to spray printing four color, a machine will have to install four print head, so cost is very high.

Therefore, the digital printing equipment cost is extremely high, inkjet print head as the main digital inkjet printer consumables, is extremely expensive. Digital printing ink market price is much higher than traditional printing materials, but the output of 1 kg of ink printing area with 1 kg ink printing area is incomparable. So, in this aspect of the cost comparison, still have to look at the way is to use the type of ink, the specific requirements and printing technology and other factors.

In the traditional screen printing, manual printing screen and glue for consumable, then the human cost is more significant. Traditional printing machinery, import of octopus printing machine and elliptical machines more expensive than domestically produced, has become more and more mature, but domestic models can meet the production demand. If it and inkjet printing machine as a contrast, the purchase cost and maintenance cost is much lower.

Silk screen printing need to promote environmental protection

Environmental protection, environmental pollution, compared to traditional screen printing mainly embodied in the following aspects: in the process of production of quite a large amount of wastewater and waste ink; In printing process also need to use more or less some bad solvent, even plasticizer (thermosetting ink may add not environmental protection plasticizer), such as printing water, decontamination oil, white oil, etc.; Printing workers in practice will inevitably come into contact with the chemical solvent, glue, crosslinking agent (catalyst), containing toxic chemical dust and so on, the impact on workers health.

Digital printing process will only be in the process of pre and after processing sizing water produces a certain amount of liquid waste, seldom produce waste in the whole process of inkjet printing ink. The pollution source less than traditional printing, small impact on the environment and the contact with healthy body.

All in all, digital printing substrate is widespread, printing products, colour is gorgeous, design is fine, feel is good, environmental protection sex is strong, it is its typical characteristics. Inkjet printing machine is expensive, however, consumables and maintenance costs is high, this is a flaw in it. Digital printing products on the washing fastness and rubbing fastness is difficult to ascend; It is difficult to develop stable white ink, resulting in cannot be better on black and dark cloth printing; Due to the restriction of ink-jet printing head, it is difficult to develop can be printed out the special effect of ink; Printing sometimes must carry on the pretreatment and post-treatment, the traditional printing is complex, these are the disadvantages existing in the current digital printing.

Traditional screen printing to develop steadily in the printing industry today, must grasp the following points: improve printing ink of environmental protection, control environmental pollution in printing production; To perfect the existing special printing printing effect, and develop new printing special effects, leading printing trend; Follow the 3 d boom, developed a variety of 3 d printing effect; In keeping the printing product water and at the same time, the friction fastness properties in conventional printing development without handle, thin in imitation of a digital printing effect; Develop wide printing solutions, and constantly improve the efficiency of printing capacity, it is best to develop printing line platform; Simplify the printing equipment, reduce material for people, improve printing input-output ratio, enhance competitive advantage to the digital printing.