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In pad printing technology, the accurate restoration of color plays an important role in printing quality. In color matching, the color matching problem related to color measuring equipment is an objective scientific problem, which can be expressed by data; However, the color matching problem which has nothing to do with the equipment is subjective and is limited by the artistic cultivation and observation level. In order to meet the needs of customers, printing is not always clear water. Therefore, it is necessary to consider not only the impact of objective data, but also to achieve the required artistic effect. Observation target, observation light source or light and observer (human vision or a certain color measuring device) are three essential elements for forming a specific color. All of them are indispensable. The ability of the observer to express emotion about color is limited by many factors. Almost all variables are included in the three elements of observation color. These variables affect the color matching ability, The change of any one of these variables will have an effect on the color of the transferred image. The influence of these variables will be described below

influence of printing materials

a certain color required by customers usually comes from a color matching (color matching) system such as Pantone or a certain scale color sample. For the influence of substrate, the following four aspects are mainly considered:

(1) the substrate color of substrate material or medium and the influence of surface characteristics

(2) the printing method required to achieve a certain hiding power

(3) ink additives The influence of diluent and catalyst

(4) produce a printing method (offset printing, silk screen printing or pad printing) suitable for a certain color standard

substrate color and surface characteristics

the surface color of the substrate is an important factor affecting the color restoration of the image obtained by pad printing technology. When observing the printing color, the color seen is formed by the light reflected from the surface of the substrate and the overprint layer of the printing ink. Because the ink layer accumulated on the substrate in pad printing is thick, the light usually passes through the ink layer to the substrate, and then passes through the ink layer again after being reflected on the surface of the substrate, and is reflected to people's eyes. The amount of light reflected on the substrate of the printing material is related to the color of the material itself, especially the color of the substrate itself is darker, and the effect is more significant when observing the lighter tone printed on it

the surface characteristics of printing materials, such as smoothness or flatness and porosity, also play an important role in the color reproduction effect. Observing the unified color printed on two media with the same color but different flatness, the visual effect is different: the color printed on a smooth substrate looks brighter and higher; The same colors printed on porous rough surfaces such as fabrics appear dim. This is because the two hostages reflect different light. When the light shines on a smooth and flat medium surface, most of the light is reflected at the same angle, so most of the reflected light enters the human eye; On the contrary, rough, porous surface light is reflected from different angles, and much less light enters the human eye

therefore, the closer the color matching between the printing and the substrate, the better the pad printing effect will be obtained: a certain color can be reproduced on the coated or non coated colored paper medium, but it is very poor on the darker plastic medium. In addition, under the premise of a specific printing method, one or more layers of white ink should be preprinted as the base color, otherwise a better matching effect will not be obtained. For example, for transparent bright pigments, in order to avoid losing characteristics, a layer of white ink is preprinted before printing any color

printing times

as mentioned above, we can also see the color of the substrate itself while observing the color of the print. In order to reduce the impact of the substrate, the selected ink should be as opaque as possible. In pad printing, the thickness of printing ink layer after drying is about 20% of the plate erosion depth. If the etching depth is 0.001 inch, the film thickness after drying is between 0.0002 inch and 0.00025 inch, which is much thinner than silk screen printing. Therefore, too thin film is enough to cover up the influence of substrate color. One of the solutions is to reduce the etching depth. However, when the depth exceeds 0.0015 inch, the effective transmission of the ink is greatly reduced, and the image becomes blurred. Therefore, another method can only be taken, that is, to increase the number of times after changing the experimental radius. In pad printing, this process is called double printing or multiple printing

the use of multiple printing will undoubtedly prolong the production time. Therefore, before the use of multiple printing, it is necessary to determine whether the required production rate can be obtained. Even if a single printing does not achieve the ideal color matching, it is not necessary to use multiple printing at the cost of production time. It can be achieved by reducing the number of diluents in the ink or saving pigments. In addition, before multiple printing, it should also be determined whether the image still has good detail clarity and will not be deformed or bent during the printing process when the printing times are increased

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