唇板

唇板是狭缝式涂布头中的关键精密部件，形成涂布液挤出到基材上的窄缝。它们由上下两块平行板组成，形成一个精确控制的狭缝开口，通常范围为50至500微米。唇板具有精密加工的表面和边缘，决定涂布珠的稳定性、湿膜厚度均匀性和涂布宽度控制。唇板与涂布模体及流道配合，将涂布液均匀分布在整个涂布宽度上。

唇板通过在两平行表面之间形成精确控制的间隙来工作，涂布液通过该间隙挤出。上下板形成一个狭缝，将涂布材料计量到移动的基材上。来自流道的流体压力迫使涂布材料通过狭缝，其中间隙高度决定湿膜厚度。板的边缘几何形状和表面光洁度控制涂布珠的形成和稳定性，而狭缝宽度决定涂布宽度。板之间的精确对齐和平行度确保在整个基材宽度上均匀涂布。

Lip plates operate by creating a precisely controlled gap between two parallel surfaces through which coating fluid is extruded. The upper and lower plates form a slot that meters the coating material onto moving substrates. Fluid pressure from the manifold forces coating material through the slot, where the gap height determines the wet film thickness. The plates' edge geometry and surface finish control the coating bead formation and stability, while the slot width determines the coating application width. Precise alignment and parallelism between the plates ensure uniform coating distribution across the entire substrate width.