Dual sectional mould

Abstract

An improved two-piece segmented mold includes a plurality of tread mold segments mounted to a frustoconical seat in a mold back by a T-shaped guide bar inserted in a guide slot formed in the seat. The segments are biased to a normally closed position in abutment with adjacent segments and in abutment with a mold side plate.

Description

technical field [0001] The present invention relates to tire molds, in particular to an improved two-piece segmented mold. Background technique [0002] The two piece segmented mold includes an upper half and a lower half which meet near the axial center parting line. Each half has a frustoconical backseat that widens toward the parting line with multiple tread mold segments. The tread mold segments are mounted on the backseat of each upper and lower section, sliding on guide pins or other guides. The upper and lower segments meet at the narrow end of the seatback in a closed mold to form a tread mold ring. When the mold is opened after the curing step, the mold segments slide axially inwards, i.e. towards the parting line, and radially outwards away from the axis on the frustoconical backseat, the movement of the segments is relative to the A tire tread that releases the molded tread from the mold segments. [0003] In conventional two-piece segmented molds, the mold se...

AI Technical Summary

Problems solved by technology

A problem in conventional designs is that the uncured tire sidewall is soft and deformable, and when the mold is closed, it can get caught in the gap between the moving tread segment and the sidewall panel, where Flashing occurs on the tire sidewall, which is unsightly and undesirable on cured tire sidewalls, and removal of this flashing requires secondary processing, which requires additional time, cost and handling

Images