In screen printing, screen mesh, wire diameter and
screen textile pattern and the selected material directly affect the tension and
the network of tension, the tension and the network, is on the basis of these
parameters on the screen tension measurement, measurement of tension, detected
tension point from the inner edge of the frame should be 10 cm, otherwise the
measured tension is not accurate. SEFEN PET 1000 each mesh can achieve maximum
Zhang Guo values shown in the table below. In the table refers to the maximum
tension value is the given mesh strength display, namely, all kinds of mesh,
different wire diameter can bear and resilience of maximum force value, more
than if the table given in tension value, mesh will lose elasticity, become the
plastic deformation, which in the tension and the network should pay attention
to in the. Tension unit: n / cm ( N / CM ), available Newtonian tonometry
measurements. The tensiometer can detect the warp and weft tension. The
so-called mesh warp tension, is the entire volume mesh winding direction of
tension, namely edge typing direction on the tension of weft tension; the screen
is the screen, the width direction of tension. The tension can be seen, the same
material to create a different wire diameter, different mesh screen, its tension
is different, is the same mesh screen, its tension is different, which is the
same number of mesh, mesh of different diameters, the tension is different,
because the tensile Zhang Du and wire diameter is proportional relationship. For
example: B A is the wire radius 2 times, A wire tensile strength is 4 times of B
wire. Table in the tension value of side length of about 1 meters below the high
strength frame network effective, when the edge length of 2 meters of net frame,
then the tension value should be reduced 15%-20%, if the net frame length of 3
meters, the tension and the network, according to the table given tension
reduction of 20-25%. In order to ensure that the processing and printing, silk
screen without being torn risk, so the tension and the network, tensile stress
than the table of the low tension point is necessary.
Two, tension requirements
1, different uses of the web templates tension is
different. For example: color printing outlets, in order to ensure the tone
value accurately and reductive, required tension 20-30N / CM. The fine print,
dial scale, tension for 12-18N / CM. General graphic printing, tension for 8-12N
/ CM. Manual printing, rough printed products, or to the size precision, no
requirement, tension > 6N / CM, notably color color overprinter, in order to
make the printing position accurately, requires not only the screen tension
should be greater than 10N / CM, and set several stencil must reach a consistent
tension, for printing outlets more important, otherwise it will cause a moire
and hue deviation.
In 2, printing
outlets why higher tension net template? This is because the A, high tension
network templates can get lower network distance, when the network distance is
doubled when, will make the printing graphic deformation increases three times,
therefore, when the screen stencil tension is low, ink is not uniform and dot
enlargement and distortion, effects of hue. B, the lower the net margin, silk
screen can use a smaller pressure, so that the net template reduced wear and
prolong the service life of net template. C, smaller scraping pressure, helps to
avoid ink dot perimeter, deformation, improve the network edge sharpness, ensure
the printing effect.
