Patent ID: 7160390

Claim:
A coating die head with a slot for emitting coating liquid to be applied to a substrate, comprising: a lip located on a terminal segment of the coating die head and having a lip surface extending from the slot; and a side located on the terminal segment and having a side surface inclined to the lip surface; wherein the side surface and the lip surface are configured such that a contact angle of the side surface with respect to the coating liquid is greater than a contact angle of the lip surface with respect to the coating liquid; wherein a border line is provided between the lip surface and the side surface and the border line has straightness and parallelness, with respect to the slot, which are less than or equal to 5 μm/m; wherein, around the border line, a contact angle border line is provided between the adjacent surface regions that differ from each other in contact angle with respect to the coating liquid; and wherein a deviation between the contact angle border line and the border line is less than or equal to 5 μm.