The Effect of Composition on the Manufacture of Glassware by Pressing

JSGT 1954 V38 T017-T033

The influence of article design, moulding equipment, press details, speed of pressing, temperature of glass and glass composition on the pressing of glass articles is briefly discussed: Details of the conditions found to be necessary in order to enable a pint can to be pressed by hand in three very different glasses using the same moulding equipment and press are given. Consideration of these conditions indicates that some physical properties of the glass due to its composition have considerable effect on the pressing process. The rate of loss of temperature of the surface glass, both before contact with the mould and after, and the rate of transfer of heat from the centre of the glass to the surface, presumed to be mainly dependent on thermal conductivity and thermal diffusivity, appear to be particularly important.

H. S. Y. Gill