Pressspan
Presspaper & Pressboard

For the electrical insulation of transformers and motors

Pressboard is a tried and tested cellulose-based surface insulation material which we produce in a wide variety of types and qualities: in the form of pressboard, presspaper, kraft paper, corrugated board, pressboard with partial resin coating, mouldings, partial grid and full-surface pressboard mouldings.

Depending on the type of cellulose, fibre preparation and machine settings, Krempel offers various types of presspaper and pressboard with very special qualities. These cellulose products are manufactured on special paper machines; we have one of the world's largest production facilities for continuously manufacturing presspaper as well as state-of-the-art presses for the production of pressboard. The composition and properties of presspaper and pressboard for electrical insulation are standardised according to IEC 60641. However, we also manufacture application-specific special types.

 

PRESSBOARD

During the production of pressboard, the non-woven fabric is wound onto the so-called format roller in several layers and then cauterised. Once the desired number of layers or thickness has been reached, the "wrap" is cut. The resulting raw pressboard is automatically transported into a high-performance press, which ensures good wet compaction and dewatering. Depending on the type of pressboard, it is either dried in a multi-level heating press under pressure (POWERBOARD AK type) or using pressureless drying with subsequent calendering (types PSP 3050, PSP 3051).

 

Our portfolio of pressboards:

Type

IEC designation

Description

POWERBOARD AK Typ B.3.1A
IEC 60641-3-1

Hot-pressed, dimensionally-stable pressboard, natural colour

POWERBOARD AK CG / PHG Typ LB.3.1 A 
IEC 60763-3-1

Glued block chip made from Powerboard AK

PSP 3050 Typ B.2.1B
IEC 60641-3-1

High-density, calendered pressboard, natural colour

PSP 3051 Typ B.4.1
IEC 60641-3-1

Mouldable calendered pressboard, natural colour

PSP 3010 Typ B.6.1A
IEC 60641-3-1

High-density, calendered pressboard, orange-brown

 

Available dimensions for pressboard:

Thickness pressboard:          

0,8 - 8,0 mm

Thickness block chipboard:

9,0 - 120 mm
Format POWERBOARD AK: 2.200 x 4.200 mm

Format of calendered pressboard:

1.000 x 2.000 mm

Other formats and individual solutions on request.

 

 

PRESSPAPER

In the production of presspaper, the prepared cellulose fibres are placed on several circular screens (screen cylinders) arranged one behind the other on our paper machines and cauterised by filtration to form the wet, multi-layer non-woven fabric ("sheet"). Following this sheet formation process, the fibre structure is mechanically dewatered, dried and smoothed and compacted between the rollers of our supercalenders. This gives the presspaper its prescribed thickness and density and thus its good mechanical and electrical properties.

 

Our portfolio of presspaper and DPP:

Type IEC designation

Description

PSP 3055 Typ P.2.1B
IEC 60641-3-2

High density calendered presspaper with high chemical purity, natural colour

PSP 3055 SL Typ P.4.1A
IEC 60641-3-2

Low density calendered presspaper with high chemical purity, natural colour

Nomex®910 -

High-temperature resistant presspaper reinforced with Nomex® aramid fibres

KREMPEL-DPP -

3055 SL presspaper or Nomex®910 with partial resin coating in the B-state

PSP 3020 Typ P.6.1A
IEC 60641-3-2

Calendered presspaper for dry applications, orange-brown

PSP 3040 Typ P.6.1B
IEC 60641-3-2

Calendered presspaper for dry applications, grey-black

 

Available dimensions for presspaper:

Thickness pressboard: 0,075 - 1,0 mm

Thickness DPP:         

0,04 - 1,0 mm
Parent roll width: 2.070 mm
Cut narrow rolls: ≥ 6,0 mm

Other format products and individual solutions on request.

Applications for pressboard

  • Layer insulation, core insulation, winding insulation
  • Insulation cylinders
  • Mouldings, bars and cooling channels
  • Distancers and spacers
  • Printing plates, printing and shielding rings
  • Dielectrics in capacitors
  • Punched and folded parts

 

For applications in liquid-filled transformers we produce a wide variety of presspaper and pressboards, which we also process into presspaper with diamond-shaped resin coating (DPP), corrugated board, block chipboard, pressboard mouldings, partial grid and full-surface mouldings.

 

  • All-round insulation, intermediate insulation
  • Groove linings
  • Stator and rotor end discs
  • Coilformers
  • Punched and moulded parts

For the insulation of motors, coils and other electrical devices where the presspapers and pressboards are not impregnated with a liquid dielectric, we produce a wide range of different types of presspaper and pressboard, some of which have tailor-made properties for special applications.

CutGreen Stanz- und Bohrunterlage

CutGreen punching strips and punching boards are ideal for all types of punching and drilling processes where a stable base pad is needed.

In addition to our standard version, we also offer a special "Extra" variant for higher mechanical load capacity.

All CutGreen punching and drilling pads are made from 100% unbleached sulphate fibres and water, a truly natural product, which is therefore easy to recycle.

 

 

  • Support material for printing processes
  • Packaging
  • Shoe manufacturing
  • Sanding paper
  • Conveyor belts for electronic components

Not only are ourpresspaper and pressboards ideal as an insulation material, but also for many different uses.

Krempel presspaper & pressboard in use

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Presspan
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Pressspan in einem Transformator
Isolator aus Pressspan
Mitterhammer-Rudolf_Key Account Manager_Energy
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Rudolf Mitterhammer
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Global Sales Energy

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