Method for manufacturing pneumatic tire
A method for manufacturing a pneumatic tire includes: using a first cover material and a second cover material in a belt cover material and spirally winding the first cover material from a second side to a shoulder region on a first side; spirally winding the second cover material from the first side to a shoulder region on the second side; spirally winding the first cover material from the shoulder region on the first side to a tire equatorial plane; and spirally winding the second cover material from the shoulder region on the second side to the tire equatorial plane, the first cover material and the second cover material being layered in a region between a portion of the first cover material that is located on the second side and a portion of the second cover material that is located on the first side, thereby forming an overlapping portion.
1. A method for manufacturing a pneumatic tire that disposes a belt cover layer on an outer side of a belt layer in a tire radial direction by winding a band-like belt cover material into a spiral shape around a tire rotation axis, the belt cover material comprising a first cover material and a second cover material, the method comprising:
a step of spirally winding the first cover material from a position between a shoulder region on a second side and a tire equatorial plane to a shoulder region on a first side, one side in a tire width direction with respect to the tire equatorial plane being defined as the first side and an other side in the tire width direction with respect to the tire equatorial plane being defined as the second side;
a step of spirally winding the second cover material from a position between the shoulder region on the first side and the tire equatorial plane to the shoulder region on the second side;
a step of spirally winding the first cover material from the shoulder region on the first side to the tire equatorial plane; and
a step of spirally winding the second cover material from the shoulder region on the second side to the tire equatorial plane,
the first cover material and the second cover material being layered in multiple layers in the tire radial direction, in a region between a portion of the first cover material that is located on the second side and a portion of the second cover material that is located on the first side, thereby forming an overlapping portion,
the shoulder region being defined as a region between a position of 85% of a width of the belt layer in the tire width direction and an end portion of the belt layer in the tire width direction,
a winding start end of the first cover material being located between the shoulder region of the second side and the tire equatorial plane, and
a winding start end of the second cover material being located between the shoulder region of the first side and the tire equatorial plane.
2. The method for manufacturing a pneumatic tire according to claim 1 , wherein winding of the first cover material and winding of the second cover material are started simultaneously.
3. The method for manufacturing a pneumatic tire according to claim 1 , wherein the overlapping portion has a width in the tire width direction within a range of 5 mm or more and 40 mm or less.
4. The method for manufacturing a pneumatic tire according to claim 2 , wherein the overlapping portion has a width in the tire width direction within a range of 5 mm or more and 40 mm or less.