A screw conveyor liner is a protective layer used inside a screw conveyor to prevent wear and tear caused by the movement of materials being conveyed and/or a low friction material for the screw to run on. These liners are typically made from various materials such as plastic, polyurethane, or other abrasion-resistant substances. The primary purpose of a screw conveyor liner is to extend the life of the conveyor by shielding it from the abrasive effects of the materials being transported and/or the screw itself. The liner also helps in reducing friction, minimizing material buildup, and improving the overall efficiency of the conveyor system.
Abrasion Resistance: Polystone 7000 is highly resistant to abrasion, extending the service life of the screw conveyor.
Chemical Resistance: It resists corrosion and is chemically inert, making it ideal for conveying a wide range of substances, including corrosive materials or those with varying pH levels.
Low Friction: Polystone 7000 has a low coefficient of friction, reducing the energy required for material movement and lowering power consumption.
Non-Stick Properties: Materials often don't adhere to Polystone 7000, reducing the likelihood of build-up or blockages along the conveyor, which can hamper efficiency.
Ease of Maintenance: Due to its non-stick properties, it's easier to clean and maintain the conveyor system, reducing downtime for cleaning procedures.
Noise Reduction: The low friction characteristics of Polystone 7000 liners can contribute to quieter operation compared to metal liners.
Lightweight: Polyethylene is lighter than many metals, which can ease installation and reduce the load on the conveyor system.
Dotmar has qualified engineers that can provide direct support with the selection of the correct grade of Polystone for Screw Conveyor Liners.
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Standard Polystone 7000
Low friction and high abrasion resistant liner
Anti-static
Suitable for grain or other product that is susceptible to exploding due to static build up.
Dual Colour Wear Indicator
Designed for easy assessment of wear top help plan maintenance.
Polystone Matrox
Custom formulated for better release characteristics for improved efficiency.
Material selection is a critical consideration when choosing a plastic for screw conveyor liners, as it directly impacts the performance, durability, and maintenance requirements of these liners. Here are some key material selection considerations for plastic screw conveyor liners:
Wear and Abrasion
Abrasive conditions provide unique challenges, and therefore the material selection.
Friction
The co-efficient of friction of materials will significantly influence the efficiency and energy consumption, as well as the resistance to product sticking to the liner. Polystone 7000 has one of the lowest co-efficient of friction of all materials, with Polystone Matrox being specially formulated to further improve the release characteristics, minimising the risk of product sticking to the liner.
Regulatory Requirements
Does the application have regulatory requirements such as food contact, drinking water, anti-static or flame retardant. The food industry may also require materials to be metal detectable, x-ray detectable and/or visually detectable by being coloured blue.
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