In India, the phenomenon of uneven ink color is one of the common defects of Yintie. Inhomogeneous ink is characterized by inhomogeneity of the ink on the entire sheet, that is, the deep part is not deep, but the light part is not light, and sometimes it is bar-shaped, sometimes into a sheet, sometimes in a dotted shape. There are many. Between printed sheets, the phenomenon of uneven ink is sometimes regular and sometimes irregular. Ink color unevenness will cause the printed iron products to lose a rich level of graphic surface, which will seriously affect the appearance quality of the printed iron products. In actual production, the failure of the ink stick, the dirty plate and pattern plate, and the inaccurate time of the roller's clutching and pressing will cause the disadvantages of inhomogeneous ink, and even the inconsistent ink density before and after the printing. The occurrence of such ills will give people a feeling of imperfections in their images and images, and it will easily produce a fragmented effect. Let us analyze the factors that produce the uneven ink.
1. Axial cores are not parallel between the rollers and the axial contact pressure is not uniform
Because the ink roller core is not parallel, the pressure is light and heavy, and the distribution of the ink in the transmission is not uniform. The thickness of the ink film transferred to the plate in the axial direction is inconsistent, resulting in uneven axial ink color of the printed sheet. The main reason for this is the wear of the ink roller bearing, and the looseness between the bearing and the shaft sleeve, which results in the instability of the Cui roller. The solution is to replace worn bearings, bushings, etc. so that production can proceed normally. Another reason is that the long axis of the ink roller itself is not straight, so that the pressure at each contact point is inconsistent, resulting in uneven ink.
For the rubber roller, in addition to requiring the shaft to be straight, it is also required that the roller should be parallel and straight to the shaft, otherwise, the pressure at each contact point is inconsistent and the ink color is uneven. The solution is to replace the ink roller with an uneven core. In addition, when pouring the rubber roll, it is required to maintain parallel and parallel to the axis. For the non-parallel or non-straight rubber roller to re-grinding, serious must be re-watering.
2. The center line of the printing roller is not parallel, the axial printing pressure is inconsistent
In the Indian iron group, the three rollers of the impression cylinder, blanket cylinder, and plate cylinder require the center line to be parallel. Non-parallel will cause the axial pressure to be inconsistent. In the imprinting process of the printing iron, the amount of ink transfer will be unequal, resulting in inconsistent print shades. Most of these drawbacks have occurred on iron printing machines that have been used for many years, especially those that have been damaged or repaired poorly, and the central lines are not parallel due to the wear of gear parts. In addition, the unevenness of the cushions of the plate cylinder and the blanket cylinder can also result in the disadvantage of uneven ink. The solution should be targeted. Repair damaged drums to make their curved surfaces clean and smooth. Replace worn gears promptly. Accurately calculate the thickness of the cylinders and blanket cylinders and ensure the same linear speed of the three drums. At the same time, the liners should be kept clean, flat, and damaged in a timely manner.
3. Ink roller parts with low accuracy, roller body oval
The accuracy of the parts of the ink roller mainly refers to whether the bearing parts supporting the Crest roller are precise or not. If the support parts on both sides are not parallel to each other, the pressure at each contact point is different, and the ink color is hardly uniform. The cylinder body is elliptical and out of round and can also cause radial ink film unevenness. Generally, the iron printing plant cannot continue production after the drum of the printing machine is damaged, and immediately contact the printing equipment factory for the processing of the damage and rounding. Due to the differences in the machining levels of the equipment factories, the roundness inspection after drum body processing should be an important part of equipment acceptance. If it is found that the drum is not round and it is impossible to print iron, the equipment processing plant is required to re-process it. For the problem of the accuracy of the ink roller parts, professionals can be asked to re-test until the parallelism meets the requirements.
4. Iron roller poor static balance performance
The inertial force is generated during the rotation and the circumferential pressure of the drum changes. The reason for the poor static balance of the iron drum is excessive wear of the roller bearings, which makes the radial ink of the printing plate uneven in thickness, and the size of the printing iron pressure is different, which affects the normal transfer of the ink volume, and causes the radial density of the ink traces to be different. Device update is the fundamental way to solve the problem. Before the equipment is updated, it can be relieved by reducing the speed.
5. Water Transfer System Adjustment Measures
In general, the water delivery system of the iron printing machine cannot distinguish the amount of water according to the density of the plates, which is determined by the mechanical characteristics of the water delivery system. Therefore, it is difficult to achieve the desired effect of ink-water balance. Under normal circumstances, the ink in the graphic-intensive areas is generally more conspicuous than that in the blank graphics. If you choose a high-precision iron printing machine or use the alcohol dampening system, this situation will be greatly improved. No matter what kind of model or what kind of dampening system, the scientific mastery of water quantity is the key to uniform ink color. For different graphics, different amounts of water should be used. If it is a graphic version with a high field value or dot density value, the ink can be appropriately enlarged. Conversely, the amount of water should be properly controlled. Products printed in this way will have better graphics and effects. In short, under proper pressure, the appropriate amount of water is controlled so as to achieve the balance of ink and ink in the high speed operation of the printing iron.
6. Drum clearance pressure release phenomenon
Due to the existence of the neutral zone between the drums of the printing machine, during the transfer process from the blanket roller to the printed sheet, the gap between the blanket cylinder and the plate cylinder meets and the drum body meets. When the neutral meets, pressure is generated due to the existence of bearing clearance. In the moment of departure, there was an immediate reduction in the pressure of printing iron. Therefore, in the production of printed iron, there are drawbacks that the printed sheets produced after the pressure are released are heavy and light, as shown in Figure 1.
In summary, the inconsistencies in the color of the Indian ink are caused by a number of factors. From the aspect of operation technology, it is necessary to maintain the balance of water and ink and prevent the occurrence of ill-effects such as floral prints and dirty prints caused by inappropriate ink blending, excessive thinning or over-thickening. To prevent the phenomenon of imbalance of ink and ink caused by the misconstruction of the water due to too little water. Before the operation, do a good job in the cleaning and maintenance of the printing equipment to avoid the non-uniformity of the ink caused by careless operation. The more important thing is to work hard on the debugging and verification of the printing equipment to ensure that the drum section of the printing machine, the ink transfer system and the water delivery system are operating normally and the pressure is appropriate. The ink transfer system starts from the ink supply section, to the even ink section and then to the ink printing section. Each link must be inspected carefully. The pressure is required to be even and suitable, and the worn parts should be replaced in time. Water transfer system from the water supply to the part of the water level to the part of the plate, all require appropriate pressure, smooth water delivery. The three rollers are the core parts of the iron printing machine and found that the wear is replaced in time. It is found that the pressure is not adjusted in time to ensure the perfection and color tone of the printed iron products (Wen/Wang Shanyu)
Obsidian Gemstone meaning
With its glassy luster, obsidian is a distinctive stone. Obsidian is formed as lava from volcanic eruptions cools within the earth. The speed at which it cools prevents crystallization and the rock forms as solid volcanic glass.
Although its most common color is black, obsidian can also be found in light brown, brown mottled with black, and black with a beautiful golden or silvery sheen.Snowflake obsidian is dotted with white patches where parts of the rock have begun to crystallize. The most prized obsidian by gemologists is the rainbow obsidian variety with purple, green and gold bands of sheen.
Obsidian was revered by ancient cultures. It was one of the major barter materials, and prized for its ability to be worked to razor-sharp edges for arrows and spears. It has been used since prehistoric times for making tools, masks, weapons, mirrors and jewelry.
Healing properties of Obsidian
Obsidian helps to protect the very sensitive against depression. It is the stone of the soft hearted and gentle people of the world. Use obsidian to help block negativity of any kind. As a black gemstone, it symbolizes self control and resilience. Black stones have protective energies in the sense that black is the absence of light, and therefore, can be used to create invisibility.
Sources of Obsidian
Obsidian can be found anywhere that volcanic activity has occurred. Some of its important sources today are South America, Japan, Mexico, Afghanistan, and parts of the United States. The San Carlos Apache Reservation in Arizona, United States, produces an interesting banded variety of obsidian known as "Apache Tears".
Black Obsidian beads, Black Obsidian jewelry, Black Obsidian bracelet, Black Obsidian necklace, Black Obsidian Pendant
JOYA GIFT CO.,LIMITED , http://www.joyagifts.com