Patent ID: 8746165
Filing Date: 2014-06-10
Classification: B05C,H01B

Abstract:
1. A coating die for applying an insulation varnish around a wire conductor, comprising: a die body; and a die hole formed through the die body, the wire conductor being passed through the die hole, the die hole including: an entry portion having an opening size monotonically decreasing along a conductor insertion direction; and a coating portion comprising a sub-portion having a constant opening size, wherein: on an inner surface only within the coating portion are provided at least four protrusions equally spaced in a circumferential direction of the inner surface, the protrusions projecting toward a center axis of the die hole; and each of the protrusions runs parallel to the conductor insertion direction and includes a portion with a height gradually increasing along the conductor insertion direction from a boundary between the entry portion and the coating portion, wherein each of the protrusions does not extend till the end on a conductor outlet side of the coating portion thereby forming a gap between an end of each protrusion and the end of the conductor outlet side of the coating portion.