Liners provide material flow assistance or protection for your trough surface.
The most common types are:
Hard wearing steels such as Bisalloy or Hardox are common liner materials in abrasive applications on vibrating screens and vibrating feeders.
The plates are quench and tempered and provide much higher tensile strength than regular mild steel. For example a Bisalloy 400 plate has a tensile strength of 1320Mpa compared to mild steel with 250Mpa. Shore hardness is also generally 4 – 5 times larger than regular mild steel.
Like all metallic liners, hard wearing steels have a high friction coefficient which may allow some material to stick to the surface. Bisalloy liners are generally used in dry and abrasive conditions.
Engineering plastics such as polyurethane or polyethylene based liners provide a strong and non-stick surface for difficult to move materials.
The price of plastic liners is generally higher than steel but with a similar wear resistance to mild steel these liners can offer a long and reliable service life.
These materials are typically used in applications with sticky materials or where material flow is critical to successful operation.
Also due to their light weight they are very easy to replace for maintenance personnel.
Stainless Steel Liners
In most applications, stainless steel is used as a trough build material rather than a liner. There are applications where a trough is built from mild steel and then lined with stainless to improve material flow or corrosion resistance. Stainless steel is also slightly harder wearing than mild steel and is readily available so it is a good general liner material option.
Ceramic tiles are a high end lining system commonly used on vibrating screens and vibrating feeders in the mining industry. They offer very high wear and corrosion resistance as well as good material flow capabilities.
They are usually bonded to a mild steel backing plate which has studs and is bolted in place. For lighter applications the ceramic liners can be bonded directly to the surface of the trough.
The downsides are the high capital cost and low impact resistance.
Mild Steel Liners
Mild steel liners are a cheap method of extending the life of a trough in low abrasion applications. It also provides a good impact resistance which may help preserve the life of the unit.
In applications where sound deadening is required, a mild steel liner can be used on top of a rubber sheet to reduce the sound of material travel on the trough surface.
Occasionally, mild steel liners can be welded onto impact areas to extend the life of a vibrating feeder.
Rubber liners are common in the mining industry for use in wet processes. They are usually bonded to the trough to avoid having bolt holes in the troughs for water to leak out of.
A rubber sheet can also be bolted at the sides of the trough to allow for movement during operation. This is called a ‘live rubber liner’.
Special high wear resistant rubber is the type that is used. As long as material does not cut then the life of the liner is very good.