Screen printing has two ways: one is fixed screen, moving substrates;The other is a fixed substrates, screen mobile, also calls the run printing, used for fabric printing.In printing, the printing substrates under the block;The latter at the time of printing, screen USES the dowel locating.
1.Blocking rules.The first section in this chapter introduces the silk-screen printing machine printing substrates support device, has introduced some substrates positioning method.Mainly introduces how to install below block gauge and some special substrates positioning method.
Substrates location, as shown in figure 3-34, can be used in plate making of the correct manuscript on the top of the printing machine, make the original image exactly the same as that of plate image location, so as to achieve the goal of positioning.If the manuscript is very scattered, according to the original position with transparent tape collage respectively the manuscript in the correct position of the substrates, its methods and pain version to the main point is the same.
Substrates on printing platform, as shown in figure 3-34, on either side of the substrates (given the substrates is a rectangle, it is in two parts of the long side and short side of a place), stick with substrates of the same thickness of small pieces (metals, plastics, paper, etc.) as a gauge, thickness of rules also is a little thin substrates.But block gauge can't thick Yu Chengyin content, if the small piece of thicker than the substrates, printing will damage the screen and scraper, resulting in a printing quality.Semi-automatic, automatic screen printing machine, generally equipped with positioning device, such as automatic give assumed that a device, blocking rules (rules) device (e.g., telescopic, stationary and stick a piece of type gauge block), pin system, mold (nest) positioning device, etc.Semi-automatic, automatic screen printing press rules and manual printing method is basically the same.In matching color printing for version can turn adjusting screw to move when screen printing machine, make the print table placed blank (Yang) cross line and silk screen printing on the rules of graticule collocated, achieve the goal of positioning substrates.When adjustment, will make a cross rules first line Yang figure blank location on the print table according to the requirement, and then fixed on the framework of net mesh plate on printing on stage, then the fixed screw loosening, with the adjustment screw to adjust the printing machine in the horizontal and vertical position (X, y direction), until the screen plate with the cross on the blank lines coincide, fixed screw can be printed, as shown in figure 3-67.
Figure 3-67 semi-automatic screen printing press set rules
L - printing table 2 - chuck table 3-4-5 - adjustment screw fixed screw gauge block
FIG. 3-68 adjustable gauge block
