Patent ID: 7290996

Claim:
A vulcanizing mold for pneumatic tires, comprising a plurality of mold pieces for forming a tread portion of the tire, wherein said mold pieces can be assembled with each other side by side in a circumferential direction of the tire; said mold pieces each comprising a molding surface for forming a tread pattern of the tire tread portion, and end surfaces on both sides of the molding surface as seen in the circumferential direction of the tire, where adjacent mold pieces are in abutment with each other when they are assembled, said end surfaces of the mold piece each including an edge region situated adjacent to the molding surface to extend in a width direction of the tread portion; said mold pieces each comprising (i) a first vent means comprised of a narrow gap formed by continuously removing said edge region over substantially entire width of the tread portion, said first vent means being in communication with atmosphere, and (ii) a second vent means comprised of fine unevenness on the molding surface of the mold piece, said second vent means being in communication with said first vent means, wherein said second vent means is comprised of a plurality of narrow grooves, said narrow grooves including a first set and a second set that each extend at an angle relative to a line extending circumferentially around the mold, the second set extending at a second angle which is at least 90° apart from the first angle, wherein the first set and second set of narrow grooves intersect each other at least at one point on the surface of the mold, and, said narrow grooves being formed in the molding surface of the mold piece in a region corresponding to a land of the tread portion.