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The following section mainly introduces the most popular SODA BLAST in Europe, the United States, and Australia, and the FLEXOCLEAN CLEANING that began in Europe.
1. Soda spray method For wide and narrow flexo printing machines, the anilox roller needs to be cleaned in a special fully-closed automatic cleaning machine; for corrugated carton ink printing machines, the anilox roller does not need to be disassembled and can be directly on the machine. Automatic cleaning. It uses specially processed and dried baking soda as a cleaning medium with a certain size. After low-pressure spraying, the cleaning powder particles will continuously hit the cell site, thus clearing the dry ink, coating material and adhesion in the cell hole. Dirt and even metallic particles, such as aluminum, restore the anilox roll to its original mesh volume.
2. Fu Lai Ke Li cleaning method puts the anilox roller into the closed automatic cleaning bin of Fu Lai Ke Li. The anilox roller rotates in the special cleaning fluid of Fu Lai Ke Lie Anilox roller for warming, making it dry in the Ministry of Public Security. Ink and other impurities are softened and then cleaned with high-pressure water to achieve the purpose of cleaning. The entire cleaning process is automatically controlled.
The clogging of the cell site is the focus of attention in flexo printing. How to solve this problem is the key to ensure the quantitative transfer of ink by the wind roller and ensure high quality printing.
Fifth, the application of test wind roller technology The so-called test anilox roller (BANDED ANILOX, English translation is a segment of the anilox roller), is an anilox roller carved on a number of different network lines and the amount of ink transfer pattern, through Different substrates are tested with different types of ink at different machine operating speeds to obtain the best printing results to determine the anilox roller that selects the best number of screens and the amount of ink transferred. This method is particularly suitable for testing lithographic printing.
The test anilox roll must be used in conjunction with the test plate. After being printed on the test roll, the printed matter should be tested with a densitometer, and the best network and density values ​​should be obtained through comparative analysis to obtain the most accurate, Direct information on the best actual printing results to ensure that the most suitable anilox parameters are selected to reduce the stock of anilox rolls.
Sixth, anilox roller scraping system We all know that the role of scraping ink system is to scrape the excess ink on the anilox roller evenly, so that the anilox roller in the transfer of ink to obtain a quantitative function of ink transfer, so the scraping ink system The anilox roller is an integral part of the transmission of ink. It is also an important role.
Flexo printing mainly has the following types of squeegee:
1. The rubber squeegee roller system is used to use the rubber roller to scrape the ink with a slightly smaller linear speed difference than the anilox roller.
2. The single scraper system is used to scrape ink. The single scraper system is divided into positive scraper system and reverse scraper system.
3. The double scraper system is used to scrape ink. It is a combination of the above positive scraper and reverse scraper, and the double scraper system is divided into closed and open type.
First, the curve is used to illustrate the effect of different ink squeegee systems on Wei ink at different printing speeds. As shown in FIG. 2 , the rubber roller scraping and the forward scraping system will change the amount of ink transferred by the spring under the influence of the printing speed; and the ink amount of the reverse scraper system will not change with the influence of the printing speed.
This shows that reverse squeegee squeegee is an ideal squeegee method for flexo printing.
Modern flexo printing requires that the anilox roller can still keep the ink flowing at a high speed and speed, and the double blade system is born. Closed double blade system is especially suitable for high speed flexo presses. In the double squeegee system, the positive squeegee mainly functions as a seal, and the reverse squeegee functions as a squeegee. The lettered anilox roll ink forms a certain pressure in the double doctor blade chamber, and is conveyed cyclically, eliminating the phenomenon of ink ejection during high-speed operation. The solvent in the ink is also not easily volatilized, and the ink can be kept clean. The double-squeegee inking system eliminates the need to adjust the blade angle and position. Once positioned, the wiper system can be quickly installed. Almost all modern flexo printing presses are equipped with this squeegee system.
The actual use of the blade should also pay attention to the installation angle and anilox roller pressure, pay attention to choose the thickness of the blade, the shape of the blade and the material of the blade. The reverse blade installation angle in flexo printing is generally 30-40 degrees of tangent. The angle depends on the number of screen lines and the pressure of the blade. In general, the number of screen lines is higher and the angle is slightly larger, but the pressure between the doctor blade and the anilox roller is correspondingly increased. The matching pressure between the scraper and the anilox roller is related to whether the scraper can scrape the excess ink layer and also directly affects the service life of the anilox roller and the consumption of the scraper. Attention must be paid to the adjustment.
The thickness of the commonly used steel scraper is 0.1mm, 0.15mm, 0.2mm, and the knife edge is divided into a flat blade, a beveled blade, and a thin scraper blade (see Figure 3).
There are also users who use poly plastic scrapers. The thickness of plastic scrapers is generally 0.35mm, 0.5mm. There are also points for flat blades and inclined blades.
In flexo printing, the thickness of the steel scraper is generally 0.15mm. If the ink viscosity circle is large or an anilox roller with a lower number of screen lines (above 400 lpi) is used, a flat blade scraper should be used; an anilox roller with a high mesh number should use a thin blade or a bevel blade scraper. Generally in the full version of adhesive printing, 0.15mm flat blade steel scraper is mostly used. The squeegee is generally used in a closed squeegee system and is mostly used as a positive squeegee having a sealing effect. The plastic scraper wears the anilox roller accordingly, but the surface of the anilox roller is more demanding. In other words, the plastic scraper can only be used when high quality anilox roller is used. It is necessary to choose the material of the scraper. Pay attention to the brand.
Laser engraving of ceramic anilox rollers is very expensive and it is a critical component in flexo printing equipment. Therefore, the selection, application, maintenance, maintenance and inspection of the anilox roller will directly affect the quality and production cost of the printed product.
Flexographic Printing Laser Engraving Ceramic Anilox Roller and Ink Transfer System (Part 2)
Second, periodic cleaning must be done. Periodic cleaning is generally based on the actual use of each class, week or color change.