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International Syalons has developed a method of producing sialon ceramic paper dewatering foils that minimises the chance of ‘piano keying’ in paper manufacture.

Sialon ceramic paper dewatering foils are used in paper manufacture during the water removal stage.

This is a demanding wear application and requires the ceramic to possess a unique set of properties including wear resistance and thermal shock resistance.

Sialons are alloys of silicon nitride, and they possess the properties required for this application.

During the manufacture of paper, a section of the process involves removing water from the fibre/water pulp.

To do this, the pulp is spread over a fabric mat, which travels over a series of suction boxes.

These boxes apply a vacuum that draws the water out of the pulp as the fabric travels over them.

The suction boxes consist of a series of rows of foils, which can be many metres long.

The foil can be made of high-density polyethylene (HPDE) or ceramic material.

Ceramics are used in high-speed applications.

The foils are ground to give a mirror finish, which is important for the quality of finish of the paper.

Initially, alumina was the ceramic of choice.

However, as machine speeds have increased, up to 100km/min, so the requirement for greater wear resistance has emerged.

This is where Syalon 101 comes in.

Its wear-resistant properties, as well as thermal shock resistance, make it an ideal choice for modern, high-speed applications.

Traditionally, the foils were made up of ceramic segments 20-40mm wide.

Thus a 10m-long foil would consist of typically 500 pieces.

This can lead to a problem known as ‘piano keying’, in which segments move to ruin the perfectly flat foil surface.

To reduce this problem, International Syalons developed a patented method of producing segments up to 750mm long.

This reduces the number of segments and minimises the chance of ‘piano keying’.

International Syalons produce a range of standard foils in widths of 16mm, 22mm, 44mm, 53mm and 65mm in lengths up to 750mm long.

International Syalons

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