Patent ID: 11931979
Assignee: THE YOKOHAMA RUBBER CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 12:
13. A method of manufacturing a tire, comprising:
vulcanizing a green tire by using a tire vulcanization mold, comprising:
a tread molding surface comprising a groove molding portion and a land portion molding portion,
a surface roughness Ra in the groove molding portion being smaller than a surface roughness Ra in the land portion molding portion, the groove molding portion comprising a surface treated by a surface treatment configured to decrease the surface roughness Ra of the groove molding portion relative to the surface roughness Ra in the land portion molding portion,
in the groove molding portion, the surface roughness Ra being smallest at 0.12 μm or less in a range comprising at least a main groove molding portion, and
the surface roughness Ra in the land portion molding portion being 3.2 μm or more; wherein

when cleaning the tread molding surface, the tread molding surface is irradiated with a laser beam to remove a contaminant adhering to the tread molding surface, the laser beam is a Yb-YAG (Ytterbium-doped Yttrium Aluminum Garnet) laser beam having a wavelength of 1030 nm or an Nd-YAG (Neodymium-doped Yttrium Aluminum Garnet) laser beam having a wavelength of 1064 nm,
a light source output of the laser beam is 1 W or more and 5 kW or less,
a pulse width of the laser beam is 1 ns or more and 500 ns or less,
a pulse energy of the laser beam is 1 mJ or more and 0.1 J or less,
a pulse frequency of the laser beam is 1 kHz or more and 100 kHz or less,
a fluence of the laser beam is 0.5 J/m2 and 4.0 J/m2 or less, and
a beam diameter of the laser beam is 0.1 mm or more and 3 mm or less.