There are three kinds of inkjet printers, Piezoelectric inkjet technology, pressure valve inkjet technology and thermal foam inkjet technology, each of which has different working principles. DOD;Dod Printer,Dod Inkjet Printer,Handheld Dod Inkjet Printer,Handheld Dod Printer GUANGZHOU INCODE MARKING TECHNOLOGY CO., LTD. , https://www.gzincode.com
1) Piezoelectric inkjet technology: Piezoelectric Inkjet Printer is also called high resolution printer or high resolution image printer. On the integrated nozzle, 128 or more piezoelectric crystals are used to control multiple nozzle holes on the nozzle plate respectively. After processing by CPU, a series of electrical signals are output to each piezoelectric crystal through the driving plate. The volume is deformed so that the ink is ejected from the nozzle and falls on the surface of the moving object to form a dot matrix, thus forming text, figures or graphics. Then, the piezoelectric crystal is restored to its original state. Because of the surface tension of the ink, the new ink enters the nozzle. Because the ink dot density per square centimeter is very high, the application of piezoelectric technology can print high-quality text, complex logo and bar code information.
2) Solenoid Valve Type Printer (Large Character Printer): The nozzle is composed of 7 or 16 groups of high precision intelligent micro-valves. When printing, the characters or graphics to be printed are processed by the computer motherboard, and a series of electrical signals are output to the intelligent micro-solenoid valve through the output board. The valve opens and closes quickly, and the ink depends on the internal constant. Pressure dots are ejected, and the dots form characters or graphics on the moving surface of the printed matter.
Comparison of different digestion methods for determination of heavy metals in soil
Three methods were used to pre-treat the soil slope to be measured, including digestion by emblem wave, digestion by sealed container and digestion by electric heating plate, and then determine the pot, zinc, lead, fu, nickel and chromium by atomic absorption spectrophotometry. The results show that: Huibo digestion can completely digest soil slope samples, and it is simple and fast, which is superior to the other two methods. At the same time, through experiments, the optimal conditions for microwave digestion are further selected