16713screenprinting

16713screenprinting内容摘要：

imited shelf life(保存期限 ) when pared to indirect materials which are basically unlimited because they are stored in an inactive form. Direct/Indirect ProcessP305 Figure  The direct/indirect process bines the indirect and the direct photographic processes. An unsensitized film material is placed under the stencil side of the screen on a flat stencil emulsion is stored in two parts,a liquid emulsion and a the two are mixed and coated on the screen,they bee light sensitive and coat through the screen to the film the emulsion is dry,the backing sheet of the stencil is removed and normal direct exposure techniques are carried out. 印刷准备 1. Squeegee刮墨板的调整 作用： 刮墨板加压滑动，使油墨从网孔透过，到达承印物 要求： a. 肖氏硬度在 60 ~ 80 b. 有良好的弹性 c. 良好的耐溶剂性和耐磨性 A. 选择刮墨板材质 Chemical Makeup 材质： 天然橡胶、硅橡胶、聚胺酯橡胶 C. 调整刮墨板的角度和刮印速度：影响透墨量 角度小，速度慢：透墨量大，印品墨层厚 角度大，速度快：透墨量小，印品墨层薄 B. 选择刮墨板的形状 Shape 直角形 Square ：平面承印物， 、薄膜 Square edge with rounded corner 圆角形：厚墨 尖角形 Double bevel： 曲面印刷 Single bevel硬质材料 Double bevel,flat point 织物印刷 小面积实地印刷 平面承印物： 20 – 70度 曲面承印物： 30 – 65度 2. 安装丝网版，调节网面和承印物的间隙（ H） 3. 安装回墨板 H 0 离网印刷，可进行较精细的印刷 H = 0 全接。