Screen printing production of basic knowledge – screen printing screen, screen, screen – screen printing industry, especially web
First, the classification of mesh 1, polyester mesh (polyester) PET1000 (SL / S / T / HD) – head to 120/305 for example, is divided into three size :120-31 (S very thin) PW120- 34 (T standard) PW120-40PW (HD thick)
Features: – Tensile strength (tension) – Wear good, is not sensitive to climate
– Acid (sulfuric acid, hydrochloric acid, nitric acid) the capability of ordinary good performance Solvent
2, nylon mesh PA1000 (S / T)
To 120/305 project as an example: is divided into two specifications :120-30 (S pole) 120-35 (T very standard)
Features: – Very good wear resistance (on the rough surface or curvature of surface wear good)
– Good elasticity of high surface tension
– Good solvent resistance – Good alkali resistance Second, how to choose the screen:
1, mesh structure and mesh Line network Geometry Refers to the screen all the two-dimensional and three-dimensional appearance, the geometric structure of the basic elements of the mesh and the mesh screen wire diameter.
Such :120-34 indicated that within each of 120 cm wire mesh, wire mesh for each calibrated to the diameter of 34um.
** The mesh screen is there for each cm how many threads,
** Diameter of wire mesh that is not woven mesh wire diameter of the calibration value.
** Mesh geometry is divided into: Ping Results screen (1:1) oblique Results screen (2:1,2:2, or 3:3)
Different weave mesh size of the inconsistent methods to determine the transparency of stencil ink (ink through the printing effect is an important factor in the decision)
2, mesh opening decision: (W) ** Screen printing ink in the largest particle size (printing ink, the average particle size of the mesh must be less than 1 / 3).
** Lines and levels of sophistication of the printing dot (hole Loumo too much, not fine line)
** Ink stripping performance (such as ink particles which affect the large lead block network until the next printing ink penetration)
** Printing ink thickness (through the ink hole is too small too small, not thick ink)
General, mesh wire diameter of the hole is larger than the screen mesh than the mesh wire diameter is smaller than the screen can be a higher-resolution copy. (Of course, the ink flow, viscosity and other factors also affect)
3, right Stretching: 1, the standard Stretching steps: Screen in 1-3 minutes, stretched to the desired tension value, but fixed to the screen Network box Before, we must wait 15 minutes or more, and then the desired tension to the final tension value, if this process repeated several times, the tension will reduce future losses.
*** If you stay in the sheets 5 minutes after a good network of sticky net loss of 28% or more tension.
*** Net if the sheets after a good 15 minutes to stay sticky net loss of 15% -20% of tension.
*** If you stay in the sheets 30 minutes after a good network of sticky net loss of 10% tension.
More sticky web tension loss is a good time with just pulling the tension loss, and not sticky after a good network of tension for 24 hours after the loss of value. Overlay the screen generally the minimum requirement lay net longer than 24 hours after the burn out, or it will overprint and deformation status of inaccurate or lines.
Stretching, the printing screen to be fixed to the screen frame, the tension borne by the tensile resistance by the screen (that can withstand the maximum tension) made a decision. The tension is to ensure an accurate screen overlay and determine the appropriate network from an important factor.
In general, the higher the mesh the smaller wire mesh, wire mesh coarser than the fine wire mesh more tightly pull of some.
Correct procedures in accordance with Stretching Stretching the standard screen tension loss of 15 * 20%, PET1000 screen tension loss of 10-12.5%.
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