Screening and sorting technology

Screening and recycling – where the abrasion resistance of [PUR] really counts

Whether star-disc roller, drum or flat screens, polyurethane means you always have the ideal plastic at your disposal for such applications. Small and larger quantities can be handled with relatively low mould costs.

Careful sorting with elastic materials

For fruit and vegetables in particular, sorting processes need soft materials that handle the goods carefully. Internorm can cast polyurethane with a hardness as low as 20 Shore A for these purposes.

Our screening products are used in composting, for sieving soils, in agriculture, in mining, for wood chips and, of course, for recycling materials.

The durability advantage

As polyurethane is flexible and not as brittle as steel, such screens last considerably longer than those made from other materials. The strong cross-linking of this polymer offers the abrasion resistance necessary for such aggressive working conditions.

The mould cost advantage

The relatively low cost of the mould favours the production of both small and larger batches.

Sifting webs

Sifting webs are used in agricultural machinery, composting and beach cleaning operations. Sifting webs are made from reinforced rubber belts with riveted bars, the spacing and design of which define the sifted products. Internorm works closely with the Ricon company in this area.

www.ricon.de

ENQUIRY

Examples of applications

ASPARAGUS SORTING CHAIN, ASSEMBLED

An asparagus sorting chain with unloader made from mineral-filled thermoplastic approved for contact with foodstuffs. A mechanism moves the pans downwards.

FLAT GRID

Made from a cast polyurethane plate that was split to thinner pieces with a constant thickness after casting. Afterwards, the grid was cut with a water jet.

STAR WHEELS MADE FROM POLYURETHANE

The flexibility and cutting resistance of star wheels produced by Internorm make them ideal for extreme situations. We manufacture star wheels up to 1 m in diameter.

YELLOW FLIGHTS WITH [PUR] FINGERS

The row of fingers is cast onto a steel bar and subsequently riveted to a rubber belt together with other bars. For more information go to www.ricon.de.

CONVEYING, WEED REMOVAL AND CLEANING

The photo shows equipment required for conveying, weed removal and cleaning. From PE1000 scraper blades to [PUR] star wheels, we can supply highly specialised plastics to suit your particular application.

TRANSFER BELT WITH POLYURETHANE GRATING

The grating allows the root crops in potato or sugar beet harvesters to be transferred to a trailer. Soil and stones fall between the bars.

IDLER ROLLERS AND STAR WHEELS

These are used for the sifting webs of potato or sugar beet harvesters. The rollers are injection moulded in a two-component process, then fitted around a hard core and finished with a TPU band.

SPIRAL SEGMENTS FOR CLEANING

Made from a very soft 50 Shore A polyurethane cast with flexible lips that clean the potatoes as they are conveyed through the machine. Soil and stones fall between the spiral segments.