Production

Our insulation material is manufactured by our highly qualified staff on state-of-the-art production facilities and for applications in electric motors and transmissions as well as in transformers.

Raw material
PUCARO presspaper is produced mainly from woodpulp or cellulose of Scandinavian origin. Slow growing spruce wood warrants high-grade cellulose. To produce the cellulose, the coniferous wood is mechanically chopped and boiled in huge pressure boiler with chemicals added. This process removes the resins. The fibres are washed, dried and pressed to pulp boards. The cellulose reaches the PUCARO plant in this condition.

Stock preparation
The raw product chemical pulp is dissolved in water into individual fibres in the pulper. Subsequently the water-pulp mixture is beaten, levigated and cleaned in the refiners. Any necessary interim storage in stacking chests, the pulp suspension produced in this way is conveyed to the paper machines via pipelines.

The cardboard machine for producing presspan in rolls
The water-pulp mixture is separated with the aid of six formers and cylinder moulds. A felt takes up the originated fleece and conveys it to the press section for further drainage. After this the web passes through a floating film dryer providing the presspan with its high elongation properties. In the follow-up drying cylinders the web achieves the desired dry solid content and is then wound onto the winder.

The rolls now need a few days so that the remaining moisture is distributed evenly.

Cutting and laminating
Flexible insulation materials (presspan, polyester and polyimide films, polyester fabric, aramide papers and Nomex®) are laminated to high-grade insulating substances or coated with resins for various applications ultra-modern laminating and coating plant.

The paper machine for pressboard production
The pulp-fibre suspension is applied to a former on this machine. The formed wet web is then wound in several layers onto a former roller. After reaching the required number of layers for a certain material thickness, a knife separates the lap. Separated by cloths, the presspan boards comprising various layers of wet fabric are stacked on pallets.
The stacks are mechanically drained in a press and then automatically freed from the cloths. Then further processing is effected, depending on the targeted final product.

Pressing and drying
One portion of the presspan boards passes the calendering train after drying, where the boards are compacted to the required thickness.
The other portion is dried in the heating press under high pressure subsequent to removing the cloths.

Preformed components
In preformed components production, presspan is processed to strips, press rings, press plates, cylinders and many other products. For this operation, the presspan boards are sawn to size, milled, embossed, rolled or otherwise brought into the desired shape by other manual or mechanical means.

A portion of the boards consisting of presspan wet substance is forwarded to preformed component production where skilled specialists form various small and large preformed components, e.g. angle rings, caps and high-voltage branches acc. to customer drawings. After drying and finishing all parts are tested and then conveyed to dispatch.