Working principle of pad printing machine
1. Fixed oil basin and oil cup Most printing machines, especially large pad printers, generally use fixed oil basin and oil cup. The mechanical structure of this type of printing machine is relatively simple but very strong. The in and out of the printing head is driven by the sliding assembly. Due to the impact generated by the sliding assembly of the printing head, the printing head will inevitably vibrate, thereby limiting the printing speed of the machine body.
2. The movable oil basin and the oil cup The movable oil basin and the oil cup only move up and down, there is no mechanical impact, and the vibration of the print head is also reduced. Oil cup.
The printing machine can be divided into an open oil basin and a sealed oil cup system during the printing process. The operation of the plastic head stroke works the same on both systems.
1. Open oil basin
(1) When the pad printing head moves forward, use the oil stick to fill the patterned printed board with ink.
(2) When the pad head moves backward, the scraper scrapes off the excess ink on the steel plate, leaving only the ink in the pattern etching part.
2. Sealed oil cup system
(1) When the oil cup is pushed forward, the ink in the cup is sent to the etched position on the printed board, and the ink is filled in it.
(2) When the oil cup returns, the ceramic ring of the oil cup will be like a scraper. The principle of transfer printing is similar to gravure printing. Tools include silicone pads, patterned printing plates (steel or fiber) Ink can print all kinds of extremely fine lines, fonts and patterns, and even four-color screen images. No matter whether the surface of the printed matter is concave, convex or irregular, it can still print the desired effect. For example, printing four-color trademarks on golf balls is one of the specialties of pad printing machines.
Scrape away excess ink thoroughly.
The five main elements of pad printing
1. Sealed oil cup: integrates the functions of sealed ink storage and scraping off excess ink.
2. Print head: This is the medium that transfers ink from the printed board to the surface of the product.
3. Printed board: etching printed pattern.
4. Ink: Determine the color according to the requirements of the printed product.
5. Pad printing machine: perform transfer printing.
Sealed oil cups combine the functions of sealed ink storage and ink wiping. The ink is sealed between the surface of the printed board and the blade of the ceramic ring of the oil cup. The ink is sealed in the oil cup, which minimizes the chance of the ink exposed to the air, reduces the amount of ink volatilization, and maintains the stability of the ink concentration, thereby ensuring stable and ideal printing results. In addition, the blade of the oil cup ceramic ring needs to be hard and sharp, so Jianyi Engineering Co., Ltd. uses the hardest material among the ceramics, with 0.25mm thin steel sheet, the oil cup can play its maximum function. The diameter of the sealed oil cup is 60 ~ 195mm, suitable for general printing purposes.
The key to selecting pad printing head and pad printing ink is to get clear and vivid printing effect. When selecting pad printing head, please pay attention to: 1. Try to choose round or conical pad printing head.
2. Try to choose a pad with a larger angle.
3. If the product can withstand the pressure, a harder print head should be used because the harder plastic head has a longer life and can print a clearer pattern.
A variety of pad printing inks are flooding the market. Screen printing inks are also used for pad printing. A good pad printing ink must have the following characteristics:
(1) Strong adhesion to the printed surface.
(2) Good fluidity, some inks are in the form of slurry and cannot flow in the oil cup or oil basin.
(3) When the thinning water evaporates with the ink, it can exert its viscosity.
(4) Subtle pigments will make the gloss more obvious and reduce the transparency. The thickness of normal printing ink is 7μm.
(5) The gloss of the ink cannot be changed by the influence of the printed surface.
(6) It can dry quickly but does not affect its viscosity.
If the ink is too thick, the printing plate will be difficult to clean, causing static problems (hairline); if the ink is too thin, it will increase transparency and it is difficult for the pad to transfer the ink.
Because there are many different inks on the market, it is difficult to prescribe the time and number of times to add thinner or slower water. We can only decide by observing the printing effect. To this end, the company has launched a series of scientific equipment, such as ink density tester, to measure ink density.
Market requirements 1. Special single product market, such as mobile phone lens printing machine, toy car and optical disc industry.
2. The standard machine is equipped with a plastic head cleaning system and a DPS system in order to increase competitiveness.
3. High elasticity machine: used to meet different printing requirements and applications on the market.
4. High-speed printing: servo motor multi-plastic head equipment, such as ALIEN system.
New market direction The market for special single products is expanding rapidly. Careful tailoring of machine design and printing software equipment packages is an inevitable requirement of the market. For special product markets, in-depth research and understanding are required to make corresponding printing machines and related printing Software system, such as DVD / VCD / CDR / CD-CARD, toy car and flashlight display lens, etc.
Shandong Dyehome Intelligent Equipment Co.,Ltd(Company NEEQ STOCK CODE:836635)
Mechanical upender provides an easy and efficient way to upend metal coils, molds, dies and other heavy and bulky loads. Mechanical upenders, sometimes called coil positioners, rotate steel, aluminum & other non-ferrous coils and other loads through 90 degrees. They are used in a variety of production and maintenance applications.
Capacities are available up to 200 tons along with a variety of options.
Mechanical upenders are available in standard configurations or may be custom engineered for your particular application.
Mechanical upenders have a 3/4 round-shaped cradle that is placed on four machined steel rollers. An electric-powered gear motor driving a single or dual chain sprocket provides the ability to rotate.
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