Screens & Feeders

Poly ripple screens cement their place in the industry

Polyurethane reinforced ripple screens are not new to the quarry industry. Australian quarries have been utilising them for more than 25 years.
Although some would like to infer they are a new innovation, Locker Group has been supplying and working with poly ripple screens in the marketplace for decades.
Over this time the company has built up an understanding of how they work, which applications they are suited to and how they need to be manufactured.
Unfortunately, in recent years poly ripple screens have started to lose their efficiency, in many cases through ?design by request?, with end users opting for the use of heavier wires in the screen construction, in an attempt to prolong the screen?s attributes. This returns the ripple screen to a more rigid weave style of mesh at the cost of efficiency.
Ripple screens, whether poly ripple or straight wire ripple, when manufactured correctly are very efficient across a wide range of apertures, hence they are universally accepted in the industry.
Poly ripple screens can be manufactured with apertures between 2.5mm and 32mm and are very efficient across this range. Ripples can be manufactured with a larger aperture where necessary but their efficiency strength lies within this range. In contrast, other screening media formats have much narrower bands of efficiency. 
Straight rubber or polyurethane screening types are often only efficient within a far narrower band of apertures in heavy impact areas or are only suited to particular screening conditions, wet or dry. This means if conditions change, the site may be required to change screens to continue producing efficiently.
Poly ripple screens were originally designed to take the self-cleaning properties of the standard wire ripple screen, developing it into a longer lasting screen while delivering a more precise cut point, so it is in wet conditions that they truly come into their own. 
The secondary vibratory movement within the ripple screen allows even wet, sticky product to move through the system, with less likelihood of the screen being blocked up compared with the standard square weave mesh.
As winter descends upon the country, it is worth considering switching your ripple screens to stainless steel instead of high tensile steel (HTS).
In the finer end of screening profiles, 1.25mm to 3.15mm diameter wires and 2.5mm to 12mm apertures, stainless steel can provide extended efficiency compared with traditional materials. 
In wet weather, stainless steel is likely to further reduce the risk of blinding, allowing the product to slip through rather than sticking to the wires. Stainless steel material can provide increased efficiency, better throughput and extended life, ultimately offering a more cost-effective screening method. 
Although the replacement cost of stainless steel screens is higher than the high tensile equivalent, the benefit is in the reduction of labour costs associated with cleaning and replacing screens. 
In wet conditions many screens need to be cleared every few hours or at least every night to avoid blinding. Stainless steel can prevent this extra intervention and is much cheaper over the life of the screen, once the costs of increased shutdowns are taken into account.
There are no penalties or requirements for changing from a traditional woven wire hooked screen or HTS poly ripple screen to 
a stainless steel equivalent. It is simply a case of replacing like for like dimensions and apertures.
Locker Group understands that shutdowns and changeovers need to be kept to a minimum and the importance of fast turnaround.
The group will retain a customer?s usual specifications, so it can provide a screen tailored to its site without delay.
In addition, given the local nature of Locker Group?s product supply, if the customer?s conditions change and it needs to make an alteration to its screens? size, aperture or wire diameter, Locker Group can incorporate these changes and still deliver within a suitable time frame. The group is not reliant on overseas suppliers.
Locker Group has been manufacturing poly ripple screens at its Queensland facility for many years. It continues to invest in Australian production facilities, including extra capacity and quality improvements expected to hit the market in the third quarter of 2014.
The company?s in-house production and engineering teams assess everything from the shape and layout of the wires to the consistency of the polyurethane and how it is poured, to ensure the end result is a durable, efficient screening method.
Locker Group has experienced personnel in each state servicing the extractive industry. They are supported by four dedicated plants producing quality screening media. Locker Group produces rubber tension mats, poly and wire ripples, poly modular, rubber modular and traditional woven wire screens in high tensile, stainless steel or copper.
In addition, the group can offer any screening media and accessories available in the market. 
Source: The Locker Group

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