All of the screen frame angle must be sanded into a bit circular, all of the screen frame boundary with sandpaper and grinding, no may cause damage to the screen of the rough spots.

• 所有的网框角都务必用砂纸磨不败稍方形，所有的网框边也给用砂纸打磨，包管操纵任何不定差丝网造不败败坏的粗劣不面。