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Checking mesh tension
In order to check the screen tension, the following methode is recommended by ESMA as a standard.
Normally, the print image is positioned in the center of a screen
In order to check the mesh tension, the measuring instrument is placed in position of 5 points within the stencil area
Independent from the mesh angle, the measuring results are taken in the direction of the sqeegee stroke
A first check is carried out in the center of the screen
The 4 other check points are at the intersection of imaginary lines drawn lengthwise and across the screen to divide it into 9 sections. The attached drawing illustrates the procedure
The tension measuring results at the 5 points should not deviate more than +/- 1 - 2 N/cm. A set of screens for multicolour printing must also be within the same tolerance.