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Analysis: printing ink transfer performance of the core roller - roller, transfer ink - Printing Industry by big tree
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Analysis: printing ink transfer performance of the core roller - roller, transfer ink - Printing Industry by BIG TREE
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| Article Posted: 06/20/2010 |
| Article Views: 30 |
| Articles Written: 1033 - MORE ARTICLES FROM THIS AUTHOR |
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Analysis: printing ink transfer performance of the core roller - roller, transfer ink - Printing Industry |
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Business,Business News,Business Opportunities
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Anilox roller Is Flexible Print Machine for the ink system quantitatively major components, has been hailed as flexographic printing press of the "heart" of a direct impact on the quality of roller printing quality and effectiveness.
Mass roller ink performance is its acceptance, transfer ink capacity and uniformity. Mass ink roller performance and network points of the shape, arrangement point of view, capacity, and the roller of the lines, production materials and other factors. These factors are discussed below roller ink transfer performance.
One network point of view the shape and arrangement of Watch the opening hole
overlooking the shape of diamond, hexagonal, hexagonal hole of the opening degree of a larger network, thus dwell, ink transfer performance better than the diamond. Net hole cross-section is generally hemispherical shape, the shape of network points of this network wall smooth transfer of beneficial Ink. Net general and promising point of the array angle (as shown in Figure l): 30 °, 45 °, 60 °.
30 ° hexagonal mesh points better ink release, but the roller surface of the mesh wall of the knife and caused excessive wear and tear between roller and web wall will destroy the ink flow uniformity . Therefore, 30 ° are difficult to produce hexagonal mesh points uniform ink film.
45 ° diamond mesh point performance is better, but its network of walls is generally 15-20 m wide, making net more points gap, transfer the ink is not uniform. 45 ° diamond mesh points and the communication pipe shape has been a tendency to deep, too deep will reduce the release of ink is not conducive to the transfer of ink, printing ink increase dwell hole in the bottom of the embolization, thereby increasing the cleaning difficult.
For 60 ° hexagonal mesh point, due to its effective geometry, so that it can make maximum use of space, and the 60 ° arrangement makes the network point compact, and that is in the same area of the roller surface can be sculpture network of more equal size hole, transfer more ink. Through mathematical calculations indicate that, in the same region within the hexagonal network of the space occupied by point diamond mesh points more than l5%, which means that the hexagonal network of points can reduce the hole deep rather than l5% affect the original capacity. Therefore, 60 ° hexagonal mesh points in the same ink transfer case, light can be carved more conducive to transfer ink.
45 ° and 30 ° arrangement of the roller is generally used for coating, film and ~ more special printing, flexo printing in general has been vacant. The most widely used in production is the hexagonal network of 60 points. Roller arranged.
Second, the capacity of network points
Network capacity point is the roller under normal conditions, the ink per unit area can accommodate the amount of units BCMin2 (1010 m3/in2). Network capacity and depth of hole and mouth opening, and when a certain volume of network points, the mesh point is inversely proportional to the depth and opening. Generally speaking, the depth of the opening net points to 23% ~ 33% (ie net points of the opening for the 100 m, then its depth in the 23-33 m), the ideal is 28%.
Net hole the size of the printing capacity of the network increases have a great impact. Large capacity mesh points, then transfer the ink on the more easy to increase the network; network capacity of a small hole, only a very small printing process the ink is delivered to the substrates and prevent fly ink dot gain and to ensure printing quality. Therefore, the net hole transfer ink capacity to meet the requirements of the case as small as possible. This also confirms the 60 ° arrangement of hexagonal roller best, this arrangement makes more per unit area can be arranged in such volume of network points, the same amount of ink transfer case, the network can do a small hole more.
III line roller number Line roller along the roller axis is the number of units of length the number of access points, which determines the uniformity of ink transfer roller and transfer ink. The higher the number the line roller, roller ink on the closer "continuous" state. In addition, the roller of the lines has a direct relationship with its capacity, so its very important to transfer the amount of ink. When the roller lines increases, the dwell hole opening area is reduced, the capacity becomes smaller, so ink transfer is also smaller. Thus, the higher the roller lines, the less ink transfer.
In addition, the roller of the lines determines the scope of its own. In general, large areas of the field in the printing blocks of color or image when asked not to be too high, considering the number of low line roller: The semi-tone or color printing, the required number of high line roller, dwell openings to ensure the area is less than the printed version of the smallest dot area, thus reducing the network's increased. Net roller lines must match the number of print wires and their ratio is about 5:1, for individual refined products, this percentage still higher. But the roller of the lines is not as high as possible, lines very difficult to make after dwell dwell hole interpretation of ink to the plate, resulting in inadequate for the ink, not the blur field density. Therefore, the roller of choice not only require a high roller lines, must also consider the density of printing. Practical work, to be printed according to different grades to choose a reasonable number of lines. I am a professional editor from China Product, and my work is to promote a free online trade platform. http://www.himfr.com/ contain a great deal of information about binocular digital camera , nikon d2hs welcome to visit!
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