Method for reducing thermally induced fracture in cathode ray tube bulbs

摘要

Method for reducing the likelihood of cathode ray tube glass bulb and bulb component fracture which are caused by temperature cycling in the cathode ray tube manufacturing process and which are associated with defects in the glass. Temperature gradients between glass exterior surfaces and glass interior, arising during cooling, are locally reduced. In a preferred embodiment, a thermal insulator is applied prior to or during cooling, over a defect and its vicinity in order to locally reduce the rate of surface cooling and thus locally reduce the cooling-induced surface tensile forces. An improved component-in-process is depicted which has a reduced susceptibility to thermally induced fracture.