Screen printing ink performance determination
2024-04-21 12:08:42
The components of screen printing ink are mainly composed of pigment particles, resin, solvent and modifier. Although the main function of the pigment particles is to display color, the size and dispersion of the particles will have a certain effect on the rheological properties of the ink. The main function of the modifier is to improve certain rheological properties of the ink.
The principle and process of screen printing are used. The screen printing ink is squeezed through a layer of nylon cloth with graphics (holes). The ink is printed on the object through the small holes in the cloth to form an image. The number of holes per square inch determines the quality of the print and also affects the rheological properties of the ink.
Before printing, the ink is laid flat on the screen and cannot be dropped through the mesh. This requires that the ink has a higher viscosity under the action of low shear force and does not flow under the action of gravity. In use, when the roller is pressed over the mesh, the ink is squeezed and passes through the mesh.
In this way, the ink must be sheared and thinned under the action of external force. Under the action of external force, the original structure can be quickly restored, and the viscosity is high, and the ink will drip through the mesh without being placed. When the roller passes through the mesh cloth and presses the mesh cloth onto the printed matter, the ink will be distributed to the object in the form of ink dots according to the distribution of the holes on the mesh cloth. At this time, the length of time that the ink structure recovers is critical. If it is too short, it will cause shortcomings. If it is too long, it will cause scattered points. Both of these situations will cause a reduction in image clarity.
Rheological performance analysis
The principle and process of screen printing are used. The screen printing ink is squeezed through a layer of nylon cloth with graphics (holes). The ink is printed on the object through the small holes in the cloth to form an image. The number of holes per square inch determines the quality of the print and also affects the rheological properties of the ink.
Before printing, the ink is laid flat on the screen and cannot be dropped through the mesh. This requires that the ink has a higher viscosity under the action of low shear force and does not flow under the action of gravity. In use, when the roller is pressed over the mesh, the ink is squeezed and passes through the mesh.
In this way, the ink must be sheared and thinned under the action of external force. Under the action of external force, the original structure can be quickly restored, and the viscosity is high, and the ink will drip through the mesh without being placed. When the roller passes through the mesh cloth and presses the mesh cloth onto the printed matter, the ink will be distributed to the object in the form of ink dots according to the distribution of the holes on the mesh cloth. At this time, the length of time that the ink structure recovers is critical. If it is too short, it will cause shortcomings. If it is too long, it will cause scattered points. Both of these situations will cause a reduction in image clarity.
Rheological performance analysis
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