What is the tool for measuring the screen printing mesh?
1. Density meter:
Densitometers are the original measuring instruments commonly used in screen printing mesh houses. It is a photoelectric measuring instrument that measures the gray value of a black and white original and measures the continuous tone or dot value. The densitometer is divided into a transmissive densitometer and a reflective densitometer. Transmissive densitometers are suitable for measuring transparent originals, and reflective densitometers are suitable for measuring solid originals. The measurement range of the densitometer is 0-2.5. The larger the number, the higher the blackness. The basic principle of the measurement is to measure the degree of blackening, that is, blackness, after exposure and development of the photosensitive material. At the time of plate making, the silver bromide on the photosensitive material is subjected to light irradiation, and is reduced to metallic silver after development to form a certain opacity. Blackness is high, density is high; blackness is small and density is low. A meter with a filter can also measure the color density of a color original. The measurement principle is similar to the above basic principle.
2. Net ruler
The mesh ruler is also known as the warp and weft density meter. Mainly used to measure the mesh number of various screens. The mesh ruler is available in both glass and plastic. The measurement method is as follows: firstly, the screen is placed in a translucent state or placed on a table, the mesh ruler is placed on the screen, and then the mesh ruler is slowly moved on the screen to make the mesh The vertical line on the ruler is parallel to the warp or weft of the screen. At this time, due to the overlapping effect of the latitude and longitude lines of the screen and the vertical line on the mesh ruler, a prismatic pattern is formed on the mesh ruler, and the lateral diagonal of the pattern refers to The corresponding scale number on the mesh ruler is the number of meshes (inches or centimeters) of the screen being measured.
The mesh ruler is a common tool for measuring the number of mesh screens. Generally, the accuracy of the measuring instrument is maintained. The accuracy of the measured data is to keep the mesh ruler clean and to prevent scratches and bruises on the mesh ruler. Wipe the instrument clean and keep it in a safe place.
3. Tension meter
The tension meter is an instrument for measuring the mutual traction between the inside of the screen and the fixed screen contact body when the screen is subjected to a pulling force. Tension meters are available in both mechanical and electronic versions, and the unit for measuring tension is expressed in Newtons/cm. Tension can also be expressed as a relative value. The centimeter tension meter is a kind of tension expressed by a relative value, which is calculated by the value (mm) of the depth of the screen sinking by the weight of the tension meter. The tension value can be directly obtained from the indicator disc or indirectly from the control panel. get. Tension meters are available in both manual and mechanical operations. Tension meter is an important testing instrument for checking the quality of screen printing plates. In order to ensure the tension required for plate making, the tension meter should be used during the stretching process or after stretching the net.
The colorimeter is also known as a colorimeter. It is an instrument that measures the color characteristics of a material. The main purpose of the colorimeter is to measure and analyze the color, hue and color value of the measured material. If the colorimeter is connected to the computer, the color analysis and processing capabilities can be improved, and the user can find and retrieve various data from the color storage library of the microcomputer as needed.
5. Hardness tester
The hardness tester is an instrument for measuring the hardness of an object, and can be classified into a simple hardness tester and a complex hardness tester according to the degree of complexity. Hardness gauges are widely used in the rubber industry. In the screen printing process, the hardness tester is mainly used to detect the hardness of the scraper material