Aluminium core size

Figure 12. Pore/core size distribution curve for aluminium oxide 150T 1 - benzene, 2 (points) - pore size distribution derived from nitrogen adsorption data.

Core size Fuel elements from an annulus 15.24 cm wide and 76.2 cm mean diameter in cylindrical aluminium tank... 

The main can format for the European soft drinks market is the 330 ml size, made either from aluminium or steel a 250 ml size is also used. In US markets, the 12 and 16 oz sizes dominate. The core diameter is 206 for both soft drinks and beers, but in the last couple of years the market has progressively changed to the 202 diameter. (The designation 206 means a diameter of 2 " and 202 means a diameter of 2 ".) The core diameter is not the can body diameter but the neck plug diameter (see Figure 9.4 for an explanation of the terms used for can dimensions). These diameters have been metricated to a nominal 57 and 52 mm for 206 and 202, respectively. The purpose of reducing the neck diameter was to reduce the size of the can s end, thereby saving around 17-20% on the amount of metal... 

A fraction of the heat flow is, in fact, transferred from the hot to the cold panel surface by the aluminium foil through the panel flanges, rather than through the core material (so called edge effect ). As a result, the average insulation value of the panel is less than the expected value based on the actual insulating properties of the core material (centre of the panel thermal conductivity), this difference being more remarkable the smaller the panel size. 

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