Online printing is in high-speed development period, how to replicate a realistic fine print, based on the industry is the target of every enterprise.Now many of the small and medium-sized enterprises also carry on visual, hand thumb measurement and testing method of manual mill, it will hinder the improvement of the quality of screen printing.How to realize the digital network printing, standardization is a problem faced by every enterprise.The application of common tools screen printing is the key to solve this problem.The following will introduce several kinds of commonly used in screen printing testing tools.
1, the mesh test piece
Mesh test piece is screen printing workers standing of one of the test tool.It can accurately measure the selected screen mesh.Usage is to put the test piece close to on the screen mesh, look to the light, rotating mesh test piece, this is can see the test piece to produce diamond mesh interference fringes, diamond and Angle reading notes is silk screen mesh.Application of test pieces for correct choose and buy silk screen mesh has an important role.At the same time it can accurately measure the plus net printing of finished product and line number.
2, exposure test piece
Exposure test piece is one of the screen printing workers commonly used testing tools.It can accurately test the different type photosensitive glue, different sources, different colors of silk screen and photographic film thickness conditions should be chosen by the correct exposure time.Exposure test piece generally there are five ash density test, coefficient of each segment has a exposure, general to 1, 0.7, 0.5, 0.35, 0.25.After plate burning, observe five gray gradient of lines on the screen resolution, with the most clear a coefficient multiplied by the actual exposure time, exposure can calculate the best exposure time.For example, plate burning time for 10 min, plate burning after 0.7 bench line is the most clear, the box 10 minx0. 7 of the proceeds of the 7 min is the best exposure time of the screen.At the same time general exposure test pieces with different from 1% - 1% order of the node test article.Exposure test piece for improving plate yield has an important supporting role.
3, resolution of the test piece
Resolution of the test piece is one of the testing tools of plate-making process.It can accurately test the resolution of the photosensitive glue used.Listed on the test piece from 0.025 0.375 mm 15 gradient lines and 8 gradient from 0.5 -- 4 mm figure of Yin and Yang of the network.Observation on the correct time of the screen line and network, to analyze what you use the resolution of the photosensitive glue.At the same time it also can reflect the different angles of lines on the screen generated sawtooth situation is good or bad.
4, Angle and network test piece
And network point of the test piece is and network test and network perspective in the process of printing special tools.It can measure the monochromatic and network and four color and medium yellow network, quality, green and black four negatives or monochrome and network of the printed products and network perspective.Use method is to test against on the negatives or monochrome printing, rotary test piece, then to be able to see the test piece to produce a circular or diamond interference fringes, interference fringe center's Angle is and the perspective of network.
5, tension meter
Tension meter is a commonly used tool in the process of stretch mesh screen printing.At present domestic commonly used tension scoring for Newton tension meter (N/cm) and mm tension meter.They all are measured using gravity pressure screen tension.Newton tension meter can be read directly tension values.Can according to the requirements of different calendar when stretched net tension control generally between 8-25 n/cm.And mm tension meter header is a dial indicator, when use should be the first benchmark tension meter on glass on the clock to zero, and then on the tension of wire mesh, whose hands counterclockwise, big small dial clockwise, read the readings can be concluded that stretch mesh tension.Stretch mesh tension of screen printing in the printing quality of the alignment and resistance rate directly influence.
6, film thickness gauge
Film thickness gauge is used in the process of plate making test equipment.It can accurately measure the coating thickness of photosensitive glue on the screen.It is mainly used for printed circuit board, glass decoration, decoration ceramics, porcelain with transfer printing paper and special printing industry, such as net printed version.
7, the surface roughness meter
The surface roughness meter is a special instrument CeLiangWang version of surface roughness.Roughness on the surface of the screen to print out high quality screen printing quality plays an important role.If photosensitive plastic coated the thin surface of the screen, printing the finished product is easy to produce burr and sawtooth, affect the quality of printing quality.Screen surface roughness Rz value is commonly used in old said.Rz value should be under 10 microns, if more than 25 microns printing quality will be affected.
(Gold Printing Group) |
