What should I do before the frame is used?
The printing mesh has received the goods, how to better achieve the optimal use rate of the printing mesh?
First, the sharp edges and corners must be rounded and thinned, otherwise the tensioned mesh will be cut when the mesh is opened.
Second when the adhesive surface of the mesh frame is dirty or scratched, it should be refurbished, so that the adhesive will enhance the adhesion. The old frame should be Remove the sticky residue.
Third, the metal frame must be degreased with a glory before the coarsening, and the cellulose solvent and acetone are the longest used for this purpose.
However, denatured alcohol and greasy petroleum products should not be used. Some mesh aluminum strips themselves have fine grooves for reinforcement.
Fourth, the required tension of the general mesh is as follows:
(single) polyester mesh 8~10kg∕cm2, cloth 7~9kg∕cm2, stainless steel mesh 10~13kg∕cm2,
Note: The high tension mesh can be stretched to 18~15 Newtons, 1N=0.102KP. Unit: Newton
Fifth choose the ideal adhesive to have the following characteristics:
1. Can harden quickly. 2. Not affected by changes in temperature. 3. Water resistant, screen printing ink solvent and cleaning agent. 4. Non-toxic, no acid, no damage to the mesh. 5. Currently used to have Nanbao 105, 104 instant adhesive, Su Min hit hard UV and then wait.
Sixth, oblique mesh
The purpose is to set the angle of the mesh to match the angle of the negative pattern, such as 22.5 degrees for the line draft and the mesh, 45 degrees for the text, and the angle of the mesh to avoid the wrong angle, so that the black negative can be placed straight. On the printing plate, the other purpose is that the oblique web is better for ink permeability, which is related to the direction of the blade.
Seventh, mechanical stretcher
For the screen work with higher precision requirements, the printing plate can control the tension quality of the mesh cloth by using the meshting machine. The currently used meshting machine has pneumatic and mechanical type, and the meshing of the mesh is mostly adopted. Strong adhesive (such as Nanbao 104, 105 two-liquid type or instant agent). 1. Air pressure is the characteristics of the mesh machine: The air pressure type mesh machine is to pull the mesh mesh by the air pressure to open the mesh clamp. When the clamp is stretched, it is placed against the frame and pulled to the four sides. Each mesh clamp of the pneumatic type meshting machine is affected by the air pressure valve, which often causes the disadvantage of uneven tension. After the frame is cut, the frame pressure is just offset from the tensile force. 2. Mechanical machine mesh: Stretching is the wrench joystick to control the tension of the mesh cloth, so the tension of each clamp is the same, the frame is not deformed, and the mesh is stretched. The tension meter can detect the warp and weft tension at any time, but it is not suitable to place the tension meter on the mesh cloth, so as to avoid damage to the tension meter caused by the rupture of the mesh cloth when pulling the mesh cloth. The tensioning machine has a gear type and a spiral to fix the tension. good. 3. Use of air compressor: The air compressor motor should pay attention to its operation, and the R16 engine oil should be added within a limited time, and the wastewater filtered in the air compressor tank accumulator is often excluded.