When screen printing, one of the crucial steps to ensure high quality result is the screen printing stretching. And the angle of screen printing stretching is the most important.
The angle of Stretching the net is the angle between the warp of the screen, the weft line and the edge of the net frame. There are two forms of the Stretching net, one is a normal Stretching net, the other is a skew Stretching net. The following two methods of the Stretching are described respectively.The positive Stretching net is the four sides of the wire mesh meridian, the weft line parallel and perpendicular to the net frame. That is, the meridian, the weft line and the net frame are 90 degrees.
The skew Stretching net refers to a certain angle on the four sides of the wire mesh, the weft line and the net frame. It is convenient to use the normal Stretching net form, and it is convenient to operate. Because of the ability to make full use of silk screen, it can save the corner material of silk screen and reduce the waste of silk screen. But, in the sleeve
When using this form of screen printing plate prone to moire, so color printing is generally not used is stretching. The use of oblique cross Stretching net is beneficial to improve the printing quality, and it also has some effect on increasing the amount of ink leakage. The shortage is that the silk screen is wasteful. In high precision printing and color printing, stretching angle has a direct influence on the printing quality, stretching angle is not suitable, there will be a moire. So, general copy printing, often with stretching angle is 20 degrees to 35 degrees, in the printed circuit board with high resolution, due to the use of the screen mesh is higher, so the stretching angle 45 degrees more appropriate. In the actual Stretching network, in order to reduce the waste of silk screen, the general copy of print is usually used as a normal Stretching.
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