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Pressboard : -
Pressboard is a proven
insulating material with a cellulose base used for insulation class A.
Depending on the type of cellulose, fibre preparation and machine
setting, various types of pressboard can be manufactured, with very
special properties.
Standard types of Pressboard reels and Sheets :
Designation
|
Type of per DIN |
Colour
|
Applications
|
Reels
|
Sheets
|
Machine pressboard
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Pap 3020
|
Psp 3010
|
brown
|
Stamped and shaped components, coil formers, stator and rotor end plates, stamped shims.
|
High-grade pressboard
|
Psp 3040
|
Psp 3030
|
greyish black
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Slot linings, circumferential insulation, interleaving insulation for electrical machines, stamped components.
|
Transformer
pressboard
|
Psp 3055
|
Psp 3050
|
natural colours
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Insulating components in oil-filled transformers, layer insulation, core insulation.
|
Capacitor pressboard
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Psp 3065
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Psp 3060
|
natural colours
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Insulating components in oil-filled capacitors, layer insulation.
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Special pressboard
NUTOFLEX
|
Special quality
with high expansion
|
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Violet |
Circumferential insulation, slot lining,
stamped and shaped components.
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The
structure and material properties of pressboard are defined in DIN 7733
and IEC 641. A part from the high dielectric strength and the high
impregnating capacity with transformer oil (mixed dielectric
oil-cellulose), it is quite remarkable that pressboard has no melting
point. For this reason it is capable of with standing short duration
thermal stresses (e.g. a few seconds at 350 oC) without any significant deterioration in its properties. Pressboard can be stamped out, folded, cut and partially shaped.
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