Talk about net tension and frame size

The unit of measurement for tension is Newton/cm; during the stretch of the mesh, the measurement personnel will use the measuring instrument to measure the tension. In summary, the higher the reading on the tension measuring instrument, the better the printing effect achieved by the mesh. Tensioned mesh has the following advantages

Mesh tension

The unit of measurement for tension is Newton/cm; during the stretch of the mesh, the measurement personnel will use the measuring instrument to measure the tension. In summary, the higher the reading on the tension measuring instrument, the better the printing effect achieved by the mesh. Tensioned mesh has the following advantages:

It can reduce the non-contact printing frequency of the mesh when printing, making the registered printing effect of the printing press better.

Compared to a slack web press, the printers with tight webs require less printing pressure. This sounds a little puzzling, because not fully tensioned screens need to be raised to a higher level to make the printing better. In practice, however, the press needs to provide higher roller pressure during screen lift, which greatly increases the chance of printing problems such as folding, blemishes, and stencil breaks.

Moderately tensioned screens have a longer service life than those that are not fully tensioned.

Moderately tensioned screens are easier to get wrapped and recycled, improving the quality of the template exposure.

Hand-tensioned screens can only reach a tension of 1 or 2 N/cm, and the tension on the screen is unevenly distributed. Compared to the 40-ton tension screens, this type of manual tension screen is safe, but they do not achieve a good printing effect. It's like driving a car. No one wants to drive a car with no wheels on the road. Of course, the relatively small size of the repetitive stretched screens may be relatively inexpensive, and the user may choose according to his actual operating conditions.

Flexibility limit

If it is tighter and better, then why not pull the screen to a tension of 50-100 Newtons/cm?

The tension that a wire mesh can withstand is certain. If it exceeds this tension, the wire mesh will break or fall off the frame.

Affected by the tension, the frame is very prone to camber, and the size of the camber changes with the size of the frame. In general, the smaller the mesh frame, the greater the tension that can be tolerated (30 N/cm or more). However, once the actual dimensions of the frame exceed 3 square feet (even a little), the tension must be in the range of 15-25 N/cm. In addition, for those oversized mesh frames, it is necessary to use a bracket or other support structure to prevent it from bending.

For design reasons, some high-tension, low-extension screens are not affected by the first problem described above, and allow the use of screens with higher tension levels. Nevertheless, it is best for users to comply with the manufacturer's requirements regarding screen tension levels.

Frame size

The appropriate frame size is defined by the printed image. The inner side of the roller should be at least 4 inches from the inside of the image frame (measured on the horizontal plane of the image) to meet the printing machine's running and outage requirements. In addition, the margins on either side of the roller should be greater than 3 inches from the inside of the frame. In general, an 11-inch by 15-inch image requires the use of a 17-inch by 23-inch (at least) frame to eliminate printing problems. The larger the space around the print, the easier it is for the printing effect to reach high standards. If the distance between the image and the screen is too narrow, the corresponding printing problems will easily occur during the printing process, including printing stains, missing edges and distortions.