The Sterling Press Series

The Rosedowns Sterling series draws on the strengths of our previous designs and integrates them with new and innovative ideas. This has resulted in improvements to both  the performance and the ease of maintenance of our presses.

Across this series of presses there is a common format, a common design philosophy and a common objective to be the best press available for:

Value,
Performance,
Reliability,
Ease of Maintenance

The Sterling series of presses has been designed to cover the needs of both the vegetable oil and rendering industries.

The Sterling series design is modular and based around a number of drive and cage configurations. Across the series our proven multi-stage low compression worm assemblies are used. These give the best extraction rates but without the heat generation, wear and power demands of conventional worm assembly designs.

From the outset, features such as the ease of maintenance and the lifting and handling of heavy components have been considered.

Sterling Series Specifications

	Pre-Press	Full-Press	Rendering
100 Series Cage Diameter: Working Length: Nominal Power:	100 TPD* 200 mm 1500 mm 75 kW	15 TPD* 200 mm 1500mm 55 kW	1 - 2 TPH (Cake)* 200 mm 1500mm 75 kW
200 Series Cage Diameter: Working Length: Nominal Power:	200 TPD* 250 mm 1800 mm 150 kW	30 TPD* 250 mm 1800 mm 90 kW	3 - 3.5 TPH (Cake)* 250 mm 1800 mm 132 kW
400 Series Cage Diameter: Working Length: Nominal Power:	350 TPD* 300 mm 2100 mm 250 kW	55 TPD* 300 mm 2100 mm 150 kW	4 - 5 TPH (Cake)* 300 mm 2100 mm 200 kW
600 Series Cage Diameter: Working Length: Nominal Power:	600 TPD* 350 mm 2500 mm 500 kW	90 TPD* 350 mm 2500 mm 250 kW	7 - 8 TPH (Cake)* 350 mm 2500 mm 350 kW
800 Series Cage Diameter: Working Length: Nominal Power:	800 TPD* 400 mm 3200 mm 700 kW	120 TPD* 400 mm 3200 mm 300 kW	9 – 11 TPH (Cake)* 400 mm 3200 mm 500 kW

* Actual tonnages are dependant upon the feed material being processed.



Sterling Series Design Features

FEEDER
The feeder of a Rosedowns press is usually comprised of two sections – a horizontal feed section and a vertical feed section.

The horizontal feeder is a screw feeder with  a  variable speed drive to control the flow of feed into the press.

The vertical feeder is a fixed speed screw feeder that prevents the feed material from bridging in the cage inlet and feed spout. It also ensures an even feed rate to the main press cage.  Although it may help with some de-airing of the feed, in a modern press the vertical feeder is not normal designed to be a "force feeder”.

Direct drives are used for reliability and low maintenance.



PRESS CAGE.
A Sterling press has a single cage made from a heavy duty casting for reliability and durability. The cage is split on the vertical centre line and lowers within the press to the horizontal position for ease of maintenance. Appropriate cage lifting equipment is supplied with each press.

The cage is lined with fields of bars lining bars Each field of bars is separately clamped so that it can be changed without disturbing the other fields. The bars are designed to reduce the amount of ‘foots’ produced with the expelled oil.



WORM ASSEMBLY
The Worm Assembly is the part of the press that does the actual work on the feed material and as such its design is critical to the successful operation of the press.

Rosedowns have developed dedicated computer programs to design worm assemblies that give the maximum throughput and oil yields for the power input to the press.  The programs can also be used to design worm assemblies for other makes of press to give improved press performance.



FEED END DRIVE
Rosedowns’ presses are designed with the main motor and gearbox at the feed end of the press which is a cleaner and cooler environment than the discharge end of the press. The feed end of the press is a lower pressure environment than the discharge end and these factors allow for simpler sealing arrangements between the drive components and the working areas of the cage.

A feed end drive also allows for easier access to the discharge end components which are subject to higher pressures and wear

A helical gearbox is used for efficiency, reliability and ease of maintenance.



THRUST BEARING
The thrust bearing on a Rosedowns press is located outside of the main press frame and because the press is feed end driven it is also at the cleaner, cooler feed end of the press.











GEARBOX
The main gearbox for the press is always bought in from a specialist gearbox manufacturer. The economies of scale and the design expertise that a specialist can deliver mean a much more cost effective and more reliable press for you. 

We always use a world class manufacturer, typically David Brown Textron, although other manufactures gearboxes can be fitted.  We always use a helical gearbox, on the Sterling Series, they are highly efficient, reliable and simple to maintain. 

The feed end drive layout of the press helps by giving good access to the gearbox for maintenance.



DISCHARGE END BEARING
Rosedowns’ presses are designed with a discharge end bearing to support the shaft when the press is running empty or under light loads and this prevents the worms from rubbing against the cage linings and damaging both the lining and the worms.

The bearing is mounted outside of the main press body to keep it away from the hot, steamy atmosphere within the press.







WEARING PARTS
All parts of the press that come into contact with the process material are replaceable.  Cage linings and worm assembly parts are made in specialist materials to withstand the wear forces that they will encounter in operation. In suitable applications our Goldstar material will give a wear life several times that of conventional hard-facings.  All wearing parts are typically bolted in or clamped into the press.

The worm assembly parts can be fitted with an 'O' Ring or stainless steal ring sealing system. The parts are then tightened using a hydraulic shaft tensioning system. The high pressure achieved improves sealing between the components, prevents ingress of material onto the shaft and therefore makes removal of shaft pieces easier.