Determination, principle and process of the perfor

2022-07-27
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Determination, principle and process of silk screen printing ink performance

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core tip: the components of silk screen printing ink are mainly composed of pigment particles, resin, solvent and modifier. Although the main function of pigment particles is only to display color, the size and dispersion of particles will have a certain impact on the rheological properties of ink. The main function of modifier is to improve some rheological properties of ink

[China Packaging News] silk screen printing ink is mainly composed of pigment particles, resin, solvent and modifier. Although the main function of pigment particles is only to display color, the size and dispersion of particles will have a certain impact on the rheological properties of ink. The main function of modifier is to improve some rheological properties of ink

principle and process of silk screen printing

when in use, the silk screen printing ink passes through a layer of nylon with patterns (holes) by extrusion. Before use, the tensile testing machine must be put on and run to ensure that there is no fault before loading the cloth. The ink passes through the holes on the cloth and prints on the object to form an image. The number of holes per square inch determines the printing quality and also affects the rheological properties of the ink. Before printing, the ink is laid flat on the silk and cannot drop through the hole. This requires the ink to have a high viscosity under the action of low shear force and not flow under the action of gravity. When in use, when the roller presses the cloth, the ink is squeezed and passes through the hole. In this way, the ink must be sheared and thinned under the action of external force. Under the action of canceling the external force, it can quickly restore the original structure and high viscosity, so that the ink will drop through the eyes. When the roller passes through the cloth and presses the cloth onto the printed matter, the ink will be distributed to the object in the form of ink dots according to the distribution of holes in the cloth. At this time, the ink structure recovery time is very critical, too short, will lead to a shortage of up to 12% Dot. If it is too long, it will cause scatter. Both of these situations will reduce the image definition and provide more efficient services

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