What is the main process of screen printing? Is its technological process needle?
The main process of screen printing is: making originals, making screen plates, printing, ink drying, etc.
Auxiliary instruments and tools
What is a tensiometer?
Tensiometer is an instrument to measure the mutual traction between the inner part of the wire mesh and the contact body of the fixed wire mesh when the wire mesh is under tension. There are two types of tensiometers, mechanical and electronic. The unit of measuring tension is expressed in Newton / cm. The tension can also be expressed as a relative value. Cm tensiometer is a kind of tension expressed by relative value, which is calculated by the value (mm) of the depth of wire mesh sinking caused by the weight of tensiometer itself. The tension value can be obtained directly from the indicator panel or indirectly from the control panel. There are two kinds of tensiometer: manual operation and mechanical operation. Tensiometer is an important instrument for testing the quality of screen printing plate. In order to ensure the tension required by plate making, tension meter shall be used to measure the tension during or after the “tension screen” process.
What is a mesh ruler? What is its purpose?
Mesh ruler is also called theodolite. Mainly used to measure the mesh number of various kinds of wire mesh. There are two types of mesh ruler: glass plate and plastic plate. The measurement method is: when measuring, first place the screen in a transparent state or on the “viewing platform”, place the “mesh ruler” on the screen, and then move the “mesh ruler” slowly on the screen, so that the vertical line on the mesh ruler is parallel to the longitude or latitude line of the screen. At this time, because the vertical line on the mesh ruler overlaps with the longitude and latitude line of the screen, a prismatic flower is formed on the mesh ruler The corresponding scale number on the mesh ruler indicated by the transverse diagonal of the pattern is the mesh number (‘inch’ or cm) of the measured mesh.
Mesh ruler is a common tool for measuring mesh number. Generally, it is necessary to keep the accuracy of the measuring instrument and the accuracy of the measurement data. It is necessary to keep the mesh ruler clean to prevent scratches and bruises on the mesh ruler. After use, the instrument shall be wiped clean and kept properly.
What is a densitometer? What is its purpose?
Densitometer is a common original measuring instrument in printing factory. It is a photoelectric measuring instrument for measuring the gray value of black and white originals and the value of continuous tone or dot. The density score is divided into two types: transmission densitometer and reflection densitometer. The transmission densitometer is suitable for measuring transparent originals, and the reflection densitometer is suitable for measuring field originals. The measurement range of densitometer is 0-2.5. The larger the number, the higher the blackness. The basic principle of the measurement is to measure the blackness of the sensitive material after exposure and development. In plate making, the silver bromide on the photosensitive material is affected by the light, and after development, it is reduced to metallic silver, forming a certain opacity. The density is high for those with high blackness and low for those with low blackness. The meter with filter can also measure the color density of the original color. The measuring principle is similar to the above basic principle.
What is a colorimeter? What is its use?
Colorimeter is also called colorimetry. It is an instrument for measuring the color characteristics of materials. The colorimeter is mainly used to measure and analyze the color, hue and “color value” of the measured materials. If the colorimeter is connected with a computer, the ability of color analysis and processing can be improved. Users can find out all kinds of data from the computer’s color storage for color matching according to their needs.
What is a durometer? What is its purpose?
Hardness tester is an instrument for measuring the hardness of objects. It can be divided into simple hardness tester and complex hardness tester according to the complexity. Hardness tester is widely used in rubber industry. In the process of screen printing, “hardness tester” is mainly used to test the hardness of scraper materials.