The Control and Distribution of Temperature in Lehrs

JSGT 1928 V12 T146-T161

The demand for a more careful annealing of glassware grows more insistent every year. There is no doubt that in the past, taking the industry as a whole, much ware has been turned out with a distinct amount of strain in it. Such particularly applies to bottles and other containers, the useful lives of which were usually short and the requirements for which were not very stringent. Providing, therefore, that the degree of strain was not so great as to cause unfavourable reports from the consumers, there was no particular need of a fine degree of annealing. During recent years more stringent demands are now being made on the manufacturer in all directions. Several factors have contributed to the change, such, for instance, as the growing keenness of competition, the higher cost of fuel, the employment of technical aid by certain firms, and last, but not least, the increasing use of bottles as containers of foodstuffs needing to be processed or pasteurised. Such factors have resulted in a general tightening up in the manufacturing processes, and annealing has been one of the subjects of keen study. The subject of annealing has already been dealt with in several papers delivered before this Society, but there are some practical aspects of the problem which we think worthy of a detailed study.

A. Cousen, H. W. Howes & F. Winks