Abstract: A tire vulcanization mold in which a surface roughness in the groove molding portion of the tread molding surface is made smaller than a surface roughness in the land portion molding portion, in which a surface roughness in the groove molding portion is minimized to 0.12 ?m or less in a range including at least a main groove molding portion, and in which a surface roughness in the land portion molding portion is made to be 3.2 ?m or more, is used to manufacture a tire, and when cleaning the tread molding surface, the tread molding surface is irradiated with a laser beam to remove contaminant adhered to the tread molding surface.

Abstract: A prepreg tape is firstly prepared by bonding prepreg layer to a backing paper and then the prepreg tape is cut to a depth enough to cut the prepreg tape but not the backing paper. A unnecessary portion of the prepreg tape is removed from the backing paper to obtain a cut prepreg tape. A laminating attachment is moved in a predetermined direction while urging the prepreg tape against the surface of an operating table. The cut prepreg tape is peeled off from the backing paper and the peeled off prepreg tape is bonded to the operating table. The cut prepreg tapes are successively oriented in a predetermined direction and juxtaposed to form a laminated sheet. When the sheet is mounted on a mold of a predetermined shape. When the impregnated thermosetting resin is perfectly cured under heat and pressure a product useful for assembling various vehicles can be obtained.

Abstract: A prepreg tape is firstly prepared by bonding prepreg layer to a backing paper and then the prepreg tape is cut to a depth enough to cut the prepreg tape but not the backing paper. An unnecessary portion of the prepreg tape is removed from the backing paper to obtain a cut prepreg tape. A laminating attachment is moved in a predetermined direction while urging the prepreg tape against the surface of an operating table. The cut prepreg tape is peeled off from the backing paper and the peeled off prepreg tape is bonded to the operating table. The cut prepreg tapes are successively oriented in a predetermined direction and juxtaposed to form a laminated sheet. The sheet is that mounted on a mold of a predetermined shape. When the impregnated thermosetting resin is perfectly cured under heat and pressure, a product useful for assembling various vehicles can be obtained.

Abstract: A pot lid adaptable to a cookpot for boiling down foods such as fish, meat and the like. The pot lid has a plate having a contour adaptable to the cookpot, and a cover detachably installed on an upper surface of the plate. The plate has a threaded hole at its center, openings for releasing steam and grooves which extend to the circumferential end of the plate. The cover has a diameter large enough to close the openings and a rod projecting downwardly. The rod has a threaded groove at its end portion with an ungrooved portion being left above the threaded groove. The threaded groove is engageable with the threaded hole of the plate. When in use, the ungrooved portion of the rod is slidably held within the threaded hole of the plate to permit a heated broth of the boiled foods to discharge from at least the openings.