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Transformer board

Cylinders are made with precompressed transformer board type B.3.1 A with nominal thickness from 1 to 8 mm. They can be supplied in different types: open, closed multi-layered, sector and not calendered.

The longitudianl joint is made with a chamfer which varies according to the cylinder thickness and which can reach a maximum width of 170 mm. Glueing is performed using polyvinyl alcohol glue which ensures optimum resistance to oils. In the glueing area the cylinder thickness may be approx. 0,5 mm larger than the nominal thickness.

Open cylinders have the same chamfer as closed cylinders.
The main information of the product are:

Standard values of thickness   1,2,3,4,5,6,7,8 mm.
Standard values of chamfers 60,90,100,120,140,150,160,170 mm.
Minimum diameter 150 mm.
Maximum diameter 1300 mm (over 1300 mm with jointed sheets).
Maximum height 2500 mm.
Tolerances on dimensions thickness ± 10%, internal diameter (depending on thickness) ± 1,5 to 3,5 mm, height from – 4 to + 4 mm.
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