addition to the high dielectric strenght, another particular
feature is the fact that pressboard has no melting point and
is able to withstand severe short duration thermal stresses
- e.g. a few seconds at 350°C
- without any significant deterioration in its properties.
KREMPEL pressboard is therefore used up to approx. 190°C
in appropriate cases in machines which operate for short periods
instead of films or plastic papers. Another special feature
of pressboard is its extremely good impregnating capacity
with transformer oil (ideal dielectric mix of oil-cellulose).
After drying, KREMPEL pressboard can be full impregnated with
insulating oil as the cellulose fibre capilaries create a
high pore volume. Our pressboard can be cut, stamped out,
folded and partially shaped. This means no problems with subsequent
pressboard is a proven insulating material with a cellulose
base used for insulation class A (105°C).
Its structure and material properties are defined in
DIN 7733 and IEC 641.
insulating material with a cellulose base
high dielectric strength
no melting point
extremely good impregnating capacity
available in reel or sheet form
Pressboard is a paper-like product consisting of pure
cellulose fibres. Contrary to what its name suggests,
pressboard is not manufactured in a pressing process
with the help of bonding agents but is instead made
into insulating paper of the maximum purity in a layer-forming
process. We use specially developed paper or board machines
to manufacture thin pressboards as "presspaper reels"
or thick pressboards as "pressboard sheets". We also
producde pressboard in corrugated form - co-called "corrugated
board" - for specific applications.
Flexible multi-layer insulation materials:
all insulation classes.
Progress in electrical engineering demands
insulating materials with optimum mechanical, electrical and
chemical properties for increasingly higher insulation classes.
KREMPEL meets this requirement with its flexible multi-layer
insulation materials. The composition and material properties
of flexible multi-layer insulation materials - also called
laminated sheets - are set out in KIN 7739, VDE 0316, DIN
EN 60626 or IEC 626.