Characteristics and Research of Electrostatic Printing (I)

The principle of electrostatic printing of textiles is to design and store customer's design requirements; computer-processed graphic images are developed by electrostatic latent images, and the color toners suitable for fabrics are transferred to the printed fabrics; Fix the color to get the desired pattern. Inkjet printing is controlled by a computer according to design requirements. The ink containing the pigment is controlled to be sprayed onto the printed substrate (fabric) through a nozzle under the pressure to form a pattern; according to the performance of the ink system, the fabric is properly treated to make the fabric With a certain degree of fastness and brightness.

1. Common points of electrostatic printing and ink jet printing

(1) Combining digital printing with computer CAD system, theoretical design is not limited by the number of colors or screen overlay error. Its image resolution is generally 360dpi (rotary screen printing routine 100dpi, maximum 255dpi), and some even up to 1 440 dpi, fineness accuracy is less than 0.1 mm, can print 16.7 million colors of 256 color levels Make the pattern have a good level of expression. The design and modification of the pattern is extremely convenient. Customers can see the final pattern effect from the computer through the network, and can be modified to truly achieve "WYSIWYG".

(2) In electrostatic printing and ink jet printing, the printing head does not directly contact the fabric, so there is no limit to the type of fabric.

(3) The printing process is simple, eliminating the need for complicated screen plate making and color mixing. From the client's submission of patterns to proofing production, only 2-3 days, greatly improving the printing and dyeing enterprises' rapid response to changes in market demand.

(4) The size and position of the graphics can be freely adjusted, allowing mass customization, and the unit production cost has little to do with the output. Therefore, it is theoretically possible to process printed products of any size and in batches, which can reduce the cost of small batches.

(5) No need for color paste preparation, screen cleaning and screen replacement, clean working environment. In addition, the pattern data can be stored on discs and disks, and it is not necessary to save venues such as net frames and floral cones. Compared with large machines such as printing machines, inkjet printing and electrostatic printing use small equipment, and the process is shortened, manpower is saved, and operation is simple.

(6) Due to the reduced amount of dye and the absence of dye, the colored wastewater is reduced.

2, the advantages of electrostatic printing

(1) Increased printing speed Ordinary rotary screen printing speed is 40m/min or more, and inkjet printing speed is generally 0.1-0.33m/min. From the current paper copy or laser print speed estimation, fabric static printing speed can reach at least 10-15 m/min.

(2) The process is simple. The ink jet printing ink is liquid. In order to prevent ink from bleeding during printing, the fabric must be sizing treatment. After the printing, the paste must be washed out. Electrostatic printing uses solid toner, so there is no osmotic phenomenon, so it can be directly printed on the fabric without pretreatment, and the printed fabric is easy to clean and save water.

(3) Reduce costs

1 Reduced cost of printing materials Some people compared the four-color electrostatic printing machines in Japan with inkjet printers. The speed of electrostatic printing is about 50 times that of ink-jet printing, and the price of printing materials required per square meter is about inkjet. One hundred and one hundred percent of the printing shows that the price of materials for electrostatic printing is much lower than the price of ink-jet printing.

2 Reduce the cost of printing machine accessories The design requirements of inkjet printing machines are high and the cost is high. In particular, the problem of nozzle life is urgently needed to be solved. At present, the cost of the ink is high, the type is small, and the adaptability is poor. The ink easily clogs the nozzle and affects the product's genuine rate. The electrostatic printing uses the toner with a particle size of 5 to 10 μm to print without the need of a nozzle, thereby reducing the loss of equipment and equipment.