A.Selection of mesh frame material
General selection of LY12, LF2 and other hard alloy aluminum square pipe profile, size selection of 20mm wide, 20mm thick, four angles with argon arc welding or riveting processing.The metal frame has high precision and stable dimension.
2.Screen material selection
Currently the most used nylon mesh and polyester mesh.Nylon wire mesh heat resistance is poor, heat is easy to produce thermoplastic deformation, so that the tension is not uniform, affecting the quality of screen printing.Bonded wire mesh or screen template production is not suitable for high temperature baking.The polyester mesh has good heat resistance, stable size, and the figure does not change greatly due to the change of temperature and humidity.In order to ensure the graphic precision of mesh printing, the best choice is monofilament polyester mesh.At the same time should choose the silk mesh number is higher, the silk diameter is thinner, the mesh is smaller screen, the color of the screen with yellow or brown yellow color is good, in case of halo.
3.Stretch mesh
It is best to use pneumatic stretch and mesh machine, the quality requirements of stretch and mesh are as follows:
1. The tension of tension net is suitable and uniform
(1) the use of pneumatic tension network when the tension requirements must be left to stand for 3-6 hours before the tension network adhesive;
(2) the stretched net should be placed for at least 24 hours, especially for large cargo or machine printing, to ensure equal stress at all points and prevent deformation.The higher the mesh version of the requirements placed for a longer time, generally 2-3 days.After placing the screen tension is stable, the stress of the name point is equal, in order to ensure that the screen does not deformation, not easy to damage.
2.The warp and weft wire is kept perpendicular
3.Prevent sagging
Four.Screen stencil making process
At present, the most used is the direct method for screen template, in this production process, pay attention to the thickness of the adhesive coating is appropriate, uniform sizing, strict control of drying, exposure, development and other links, in order to get high-quality screen template.