Wire Belt Company’s Flat Spiral belting is often found in baking and washing applications where small apertures are required alongside a flat conveying surface. Flat Spiral is also a preferred choice for end-users who have previously experienced tracking problems with other spiral woven meshes, as the alternating coil pattern helps reduce any tendency for the belt to veer to one side.
Flat Spiral is constructed from alternating left and right hand spiral coils, which are woven together and joined by interconnecting cross rods.
Flat Spiral’s alternating mesh design helps reduce tracking problems caused by the belt veering to one side. The small apertures present in the belt’s construction provides end-users with a flat conveying surface suitable for products prone to slipping through more open mesh designs.
The belt can be supplied with a welded, laddered or hook edge and is used in a friction driven conveyor layouts. Flat Spiral can also be supplied with chain edges when a positive drive configuration is required. Flat Spiral is most commonly supplied in Grade 304 Stainless Steel, however, other materials are available on request.
The assembly consists of alternating left and right hand coils with each coil interconnecting with the next by means of a straight cross wire. For measuring and enquiry details click here.
In general the standard style above is available with coil wires manufactured using a flattened wire. These styles are most useful to gain more surface area when handling small base area products. When identifying the coil wire it is important to confirm the cross section dimensions.
Laddered cross wire is the standard edge finish for Flat Spiral belts. The belt edge is smooth and allows more belt edge flexibility. It is often used where welds are not desirable for the application. It is also more efficient in high temperature applications as the laddered edge is not under operational strain in use and therefore less prone to fracture.
Less common than the laddered edge type the hook edge is also often used where welds are not desirable for the application. It is also an option in applications where welding facilities are not available. The belt edge is smooth and allows belt edge flexibility.
This arrangement is less common than either the ladder or hook edge as there is reduced flexibility between the coil and cross wire at the edges. With the welding together of both the coil and cross wires there are no cut wire ends.
Along with the above mesh edge finishes these meshes can be driven by side chains using cross rods which are located through the mesh coils and then though chains at the edges of the mesh. The types of cross rod finish at the exterior of the side chain are as follows:
This is the most common and economical style of finish to a chain edge belt and comprises of a central mesh carried through the system by means of edge chains with carrier cross rods through both mesh and edge chains. Depending upon the mesh cross wire pitch the cross rods may take the place of the through cross wire of the basic mesh. The cross rods are finished at the outside chain edges with a welded washer.
Although less economical this type of assembly allows the customer or service personnel the ability to replace the edge drive chains when the mesh and rods are still serviceable. The assembly comprises of a central mesh carried through the system by means of edge chains with carrier cross rods through both mesh and edge chains. The cross rods are finished at the outside with a drilled hole to allow the fitment of a washer & cotter pin. It also allows the repair replacement of sections of belt without the need to grind off rod heads and weld back together.
NB: For greater width stability of rods to chain it is the norm, where possible, to supply the cross rods turned down to go through the edge chains.
In general the chain edge driven belts are available with 2 styles of edge chain:-
The chain edge side plate can be supported either on an angle side frame, or by means of a profiled rail to go between the side plates and support on the roller. Alternatively it can run without chain support where the mesh is supported close to the chain edge.
This chain edge can be supported on a flat angle edge wear strip with the chain roller rotating freely along the conveyor length. The roller action of the chain reduces chain wear and also reduces the operational friction at this point.
The most common form of drive is the plain steel parallel driven roller system. This system depends on the frictional contact between the belt and roller to ensure drive of the belt.
Variations of this drive type include the lagging of the roller with such materials as rubber, friction brake lining (for high temperature), etc. The use of such friction lagging materials allow for the operational drive tension in the belt to be reduced, thus increasing the useful life of the belt.
For more ‘Friction Driven Conveyor Circuit Design Guidelines’ click here
Chain Edge Driven
With this assembly of belt the cross wire pitch of the belt mesh is manufactured to ensure that the chain edge is the driving medium with the belt mesh being pulled through the circuit by the chains.
Click here to access the Belt Tracking information data.
Standard Material Availability (Mesh Only):-
Before making a selection for high temperature applications consult with our Technical Sales Engineers for the most suitable wire grade for the application as wire strength reduces at elevated temperatures.
If you have an enquiry for MESH ONLY – Transmission Chain Edge click here
If you have an enquiry for MESH ONLY – Conveyor Roller Chain Edge click here
If you are proposing a ‘new conveyor application’ then click here to access the enquiry form