SnO₂コーティングによる リターナブルガラスびんの軽量化

抄録

A technology for SnO₂ coating, which keep surface hardness and does not peel with repeated alkaline washing was developed to provide lightweight returnable glass bottles. This advanced coating method enables us to produce lightweight returnable bottles with about 20% weight reduction, which have nearly the same strength as conventional ones. It was realized by controlling the surface temperature of the bottle immediately after forming and using a chamber devised to get a uniform film thickness. The coating is formed by hydrolysis reaction of SnCl₄. Coating conditions with high durability are as follows. (1) The temperature on an outer surface of the bottle ranges from 500 to 700^oC. (2) The coating thickness of SnO₂ films is in the range of 40 to 100 nm.