Process parameter optimization of screen printing device for vacuum glazing pillar arrays

Among the key factors that comprise vacuum glazing panels, pillars are an essential element deposited to maintain the internal vacuum gap against external forces. Deposited pillars may cause cone cracks in glass according to the contact area with glass so pillars have a shape to prevent such crack. Method of depositing pillars include the screen printing method, which is widely used in forming high precision micro-patterns in fields of flat display such as LCD, PDP and organic EL. In this paper, we presented a trapezoidal cross section pillar manufacturing model that can prevent cone crack in screen printing. This paper actually examined relations between screen printing process conditions and cross section shape using the Taguchi method and analysis of variance(ANOVA), and presented process conditions through which trapezoidal cross section shape can be manufactured. Also, We finally obtained formula about the relationships based on process parameters to prevent cone crack on contact area glass and pillar, and found the optimal value of the parameters.