Balanced Spiral Woven

Established & trusted design keeps your process on the move.

Wire Belt Company’s Balanced Spiral belt is an extremely popular mesh design, found in almost every manufacturing industry with a wide ranging number of possible applications. Benefits of Balanced Spiral belt include straight-running operation, an excellent strength to weight ratio and an extremely wide variety of mesh specifications to suit each individual application.

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Balanced Spiral mesh features a simple yet effective design, constructed from alternating left and right hand spiral coils. These coils are held in place by interconnecting crimp rods which run through the width of the belt. The edges of the belt can be supplied either welded or with a knuckled selvedge.

Balanced Spiral gains its excellent tracking properties by employing an alternating pattern which prevents the belt from pulling to one side. Lateral movement within the belt is reduced by the use of specially crimped rods which hold each spiral coil in place.

Balanced Spiral is most commonly supplied as friction-drive belt; however certain meshes can be supplied as Positive-Drive, allowing sprockets to engage with the belts mesh. Alternatively, we can supply Balanced Spiral with chain edges for high load applications.

Cross-Flights and Side Plates are available for inclined applications or product separation requirements. Wire Belt Company also supplies Double Balanced Spiral belting, for applications with particularly high load and/or for products which require a narrower aperture than is possible with standard balanced spiral belts.

Other Specialised Belt Style Applications:

  • Lehr Belts for Glass Annealing
  • Swarf Filter Belts
  • Loose link and Ferrule chain edge for Cryogenic Freezers

Typical Applications:

  • Cooking
  • Heating
  • Cooling
  • Coating
  • Drainage
  • Baking
  • Industrial Curtains
  • Annealing
  • Curing
  • Shrink-Wrapping
  • Lifting Slings
  • Elevating
  • Cladding
 

Belt Types

Standard Balanced Spiral (BS)Standard Balanced Spiral (BS)

The assembly consists of alternating left and right hand coils with each coil interconnecting with the next by means of a crimped cross wire.

For measuring and enquiry details click here.  
For method of belt code identification click here.

 

 

Double Balanced SpiralDouble Balanced Spiral (DBS)

The double balanced assembly is similar to standard balanced spiral but uses coil pairs of each handing intermeshing and then link by means of the crimped cross wire with pairs of intermeshing opposite hand coils on a repeat pattern down the length. This style allows for closer pitching of coils across the width for small product handling.

For measuring and enquiry details click here.

 

Improved Balanced Spiral DiagramImproved Balanced Spiral (IBS)

The structure of this belt is similar to “Standard Balanced Spiral” but uses a straight cross wire with single interconnecting coils in a repeat pattern of left hand/right hand down the length. This assembly allows for a closer pitching of single coils across the width for small product handling.
For measuring and enquiry details click here.

For method of belt code identification click here

 

Improved Double Balanced SpiralImproved Double Balanced Spiral (IDBS)

The structure of this belt is similar to “Double Balanced Spiral” but uses a straight cross wire with double intermeshing coils of each handing interconnecting by means of the straight cross wire in a repeat pattern of left hand/right hand coils down the length. This assembly allows for a closer pitching of coils across the width for small product handling.

For measuring and enquiry details click here.

 


Flat Wire alternatives

In general all of the above styles are available with coil wires manufactured using a flattened wire. When identifying the coil wire it is important to confirm the cross section dimensions.

 

Edge Availability

Welded Edge (W) - mesh only

This is the most common and economical edge finish.  With welding together of both the coil and crimp wires there are not cut wire ends.

 

Laddered Edge (LD) - mesh only

Less common than the welded edge the laddered edge is 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 also smooth and allows more belt edge flexibility.  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.  Generally this edge finish is only available for meshes with a relatively large crimp wire pitch down the length.

Hook Edge (U) - mesh only

Also less common than the welded edge type the hook edge is 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 also smooth and allows more belt edge flexibility.  Generally this edge finish is only available for meshes with a relatively large crimp wire pitch down the length.

Chain Edge Driven Mesh

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 through chains at the edges of the mesh.  The types of cross rod finish at the exterior of the side chain are as follows:

With welded washer

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.  The cross rods are finished at the outside chain edges with a welded washer


 

With Cotter Pin & 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.

Various other styles of chain edge finish include:-

  • Cross rod welded flush to the hollow pin of the side chain.  This is not a preferred standard but may be necessary where width between conveyor side frames and other structural parts create a limitation where "welded washer" or "washer & cotter pin" cannot be used.
  • Cross rod welded flush through drilled hole on inner plates of roller conveyor chain.
In general the chain edge driven belts as shown above are available with 2 styles of edge chain:

Transmission Chain

Transmission chain has a small roller.  The chain edge can be supported either on the chain side plates or by means of a profiled rail to go between the side plates and support on the roller or alternatively without support where the mesh is supported close to the edge.


 

Conveyor Roller Chain

Conveyor Roller Chain has a large roller.  The chain edge can then be supported on a flat angle edge wear strip with the chain roller rotating freely along the conveyor length.






Click here to access the 'Balanced Spiral Mesh' only enquiry form

Click here to access the 'Transmission Chain Edge with Balanced Spiral Mesh' enquiry form

Click here to access the 'Conveyor Roller Chain Edge with Balanced Spiral Mesh' enquiry form

If you are proposing a 'new conveyor application' then click here to access the enquiry form.

Methods of drive

Friction Driven

The most common form of drive is the plain steel parallel 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

Positive Drive (PD)

The use of specially manufactured sprockets which engage in the mesh of the belt ensures that the belt can be positively driven with the minimum of belt tension and stop belt “Track Off”.  This range of belts is only available in the standard format of “Balanced Spiral” beltings. Click here for the full range of mesh specifications suitable for positive mesh drive



Chain Edge Drive

With this assembly of belt the cross 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 for Belt Installation Guidelines

Click here for Belt Tracking Information

Positive Drive Belt Specifications

Mesh Type Specification Coding Nominal Belt Thickness
(mm)
Lateral
Pitch of Coil wire(mm)
Coil Wire Dia. (mm) Crimped Cross Wire Pitch down length (mm) Crimped Cross Wire Dia (mm)
BSW-PD 18-16-16-16 7.7 16.94 1.63 19.05 1.63
BSW-PD 18-14-16-14 8.9 16.94 2.03 19.05 2.03
BSW-PD 30-17-24-17 7.3 10.16 1.42 12.7 1.42
BSW-PD 30-16-24-16 6.7 10.16 1.63 12.7 1.63
BSW-PD 42-18-36-18 6.0 7.26 1.22 8.47 1.22
BSW-PD 42-17-36-17 6.0 7.26 1.42 8.47 1.42
BSW-PD 42-16-36-16 6.4 7.26 1.63 8.47 1.63
BSW-PD 48-17-48-17 6.1 6.35 1.42 6.35 1.42
BSW-PD 48-16-48-16 6.4 6.35 1.63 6.35 1.63
BSW-PD 60-20-48-18 4.0 5.08 0.91 6.35 1.22
BSW-PD 60-18-48-18 5.2 5.08 1.22 6.35 1.22
BSW-PD 60-18-60-18 5.6 5.08 1.22 5.08 1.22
Specifications are also available using a flattened coil wire.  Please consult with our Technical Sales Engineers for the range and availability.

For Drive & Idle Shaft Set-up details click here.

All specifications are supplied with welded edge only.
 

Other Specialised Belt Style Applications:

  • Lehr Belts for Glass Annealing
  • Swarf Filter Belts
  • Loose link and Ferrule chain edge for Cryogenic Freezers
 

Standard Material Availability (Mesh Only)
 

Material Maximum Wire Operating Temperature °C
Carbon Steel  (40/45) 550
Galvanised Mild Steel 400
Chrome Molybdenum (3% Chrome) 700
304 Stainless Steel (1.4301) 750
321 Stainless Steel (1.4541) 750
316 Stainless Steel (1.4401) 800
316L Stainless Steel (1.4404) 800
314 Stainless Steel (1.4841) 1120 (Avoid use at 800-900°C)
37/18 Nickel Chrome (1.4864) 1120
80/20 Nickel Chrome (2.4869) 1150
Inconel 600 (2.4816) 1150
Inconel 601 (2.4851) 1150
NB: Before making a selection for high temperature applications consult with Technical Sales for the most suitable wire grade for the application as wire strength reduces at elevated temperatures.
 

Tracking of Friction Driven Mesh Belts

Belt track off is one of the major causes of belt failure. Incorrect tracking will lead to edge damage and early failure of the belt.
 
The recognised principle is that a friction driven belt will always track perpendicular to the roller over which it passes.  This principle holds good for all rollers in the system.
 
The conveyor should be set up to run with all rollers parallel and level to each other. 
  • As a general rule if the end rollers are not parallel the belt will track off to the short side.
  • Make sure all support beds are level and symmetrical about the centre line of the conveyor.
  • Ensure that the conveyor framework runs straight between the idle infeed and the discharge (drive) roller.
  • Ensure belt support surfaces are free from obstructions (e.g. protruding framework)
  • Do not use crowned rollers to support or drive the belt at any position in the circuit.

Caution: Incorrect installation may result in permanent damage to your belt.

Before installing the belt it is important that the conveyor structure is set up as per the above instructions in a proper aligned and level condition.
 
For belt installation please refer to the “Installation Guidelines”.  Once the belt is installed and set to run in the slow speed mode careful attention should be paid to ensure straight tracking of the belt.  If the belt tracks off to one edge then the following procedure for true tracking should be used which generally means adjusting horizontally the position of the belt support rollers.

During the procedure of belt tracking DO NOT alter the end roller positions once they have been checked and set according to the instructions above.  It is important that they run parallel and level.
 
The following are guidelines for the proper tracking of woven steel beltings: 
  1. To check for proper tracking first mark the belt at several positions down the length at an equal position in from the edge of the belt.  The edge of the belt can also be used if free and clear of any covers or guards. 
  2. The belt should now be run for several complete revolutions at slow speed to allow for settling out of the belt to its running position.  Once the belt has settled to position then measure any track off by means of the belt mark or belt edge relative to a point on the conveyor frame at the infeed end.  This will then indicate the direction and amount of belt track off. 
  3. To adjust the belt tracking please refer to the sketch below and adjust the return support rollers as per indicated in the instructions. 
  4. As a general guideline the roller closest to the infeed should be set at approximately 1¾ times the belt width away from the idle infeed roller.   Adjusting this roller may be sufficient however if you need additional tracking then adjust each roller in turn working away from the infeed.  TIP:  For large amounts of belt tracking correction it is more effective to move many rollers a small amount rather than say one or two rollers a large amount.  If the conveyor has a full wrap snub roller in the return way then adjustment of that roller may be more effective as the full wrap of belt on this roller will produce more lateral belt movement for any given amount of adjustment.
  5. At each stage of adjustment check the lateral belt movement against the previously set reference point at the infeed.  Once the belt lateral movement is stable the belt is then tracked and the rollers should be firmly secured in position.
  6. As final check move to the discharge and check for any lateral belt movement.  If there is movement of the belt at this point then adjust any carry way rollers in a similar fashion to previously.  Adjusting rollers closest to the discharge first and then moving back down the conveyor if further adjustment is required.  In general however if the belt is supported on a symmetrical chevron pattern of wear strips then the belt should self-track at the discharge.
Various other methods of belt tracking can be used under limited circumstances:-
  • Steel angle edge plates, which may be faced with low friction plastic contact surfaces. 
  • Vertical edge rollers.  These have only a single point of contact with the belt and should be used in multiples to help alleviate high pressure contact on the belt edge.
  • Hyperbolic edge rollers which offer a straight line of contact with the belt edge over the length of the roller when set at the designed angle of operation.
 
 
Any of the above can be used as a temporary measure until the belt can be re-tracked as described in the main text above.  They can also be used where the normal method of tracking is not possible or the conveyor is short with light loading, low tension and low speed.
 
There are 6 golden rules when tracking the belt:
  1. Always operate the belt with minimum of belt tension to ensure slip free drive.
  2. Always operate the belt with the minimum belt speed.
  3. Do NOT push the belt edges with excessive force to guide the belt. 
  4. Any type of belt tracking should start at the point of least belt tension.  Normally at the infeed end return way.
  5. Under no circumstances should flanged or crowned rollers be used in an attempt to track the belt.  Both will permanently damage the belt.
  6. The starting point for any edge guides should be no closer than 2 x the belt width from either the drive or infeed idle roller or any other roller where the belt contact is in excess of 30°.
Note:  For Rolled Baking Bands edge roller or guides are NOT recommended.  Only safety trip rollers or photo-electric cells can be used to stop the conveyor should excessive belt wander be encountered.  These should be set at least 10mm from the normal belt edge running position.
 

Balanced Spiral Woven—Positive Drive Belt

Sprockets & Shaft Set-up Information

As a general guide, the number of sprockets for the drive shaft can be calculated using:-
 
Belt Specification Minimum Number of Sprockets =
(round up)
Maximum Number of Sprockets =
(round down)
BS-W-PD 18-16-16-16
BS-W-PD 18-14-16-14
Belt Width (mm) x 0.006 Belt Width (mm) x 0.014
BS-W-PD 30-17-24-17
BS-W-PD 30-16-24-16
Belt Width (mm) x 0.009 Belt Width (mm) x 0.020
BS-W-PD 42-18-36-18
BS-W-PD 42-17-36-17
BS-W-PD 42-16-36-16
Belt Width (mm) x 0.009 Belt Width (mm) x 0.027
BS-W-PD 48-17-48-17
BS-W-PD 48-16-48-16
Belt Width (mm) x 0.009 Belt Width (mm) x 0.022
BS-W-PD 60-20-48-18
BS-W-PD 60-18-48-18
Belt Width (mm) x 0.010 Belt Width (mm) x 0.032
BS-W-PD 60-18-60-18 Belt Width (mm) x 0.010 Belt Width (mm) x 0.024
 

When choosing the number of sprockets, to use, consideration needs to be given to the length of the conveyor, the loading on the belt and the circuit design. 
If using the minimum number of sprockets (or near to) then, it is recommended that belt support rollers should be included between the sprockets.

Standard Sprocket Sizes:-
 
Belt Specification Code No of Teeth Tooth Rows Overall Diameter Root/Roller Diameter Face Width
BS-W-PD 18-16-16-16
BS-W-PD 18-14-16-14
18-8 4 3 50.5 mm 38.4 mm 50.8 mm
18-12 6 3 75.7 mm 63.5 mm 50.8 mm      
18-14 7 3 87.9 mm 74.9 mm 50.8 mm
18-18 9 3 112.5 mm 100.3 mm 50.8 mm
BS-W-PD 30-17-24-17
BS-W-PD 30-16-24-16
30-8 4 3 34.8 mm 23.8 mm 30.5 mm
30-12 6 3 51.6 mm 40.6 mm 30.5 mm
30-14 7 4* 59.7 mm 48.5 mm 38.1 mm
30-16 8 3 67.8 mm 56.6 mm 30.5 mm
30-18 9 3 76.5 mm 65.5 mm 30.5 mm
30-20 10 3 84.6 mm 73.4 mm 30.5 mm
30-24 12 3 100.8 mm 89.4 mm 30.5 mm
30-26 13 3 108.9 mm 97.5 mm 30.5 mm
BS-W-PD 42-18-36-18
BS-W-PD 42-17-36-17
BS-W-PD 42-16-36-16
42-12 6 4 35.0 mm 25.7 mm 29.0 mm
42-20 10 4 56.4 mm 47.7 mm 29.0 mm
42-24 12 4 67.7 mm 58.4 mm 29.0 mm
42-30 15 4 83.8 mm 74.4 mm 29.0 mm
42-32 16 4 89.3 mm 79.9 mm 29.0 mm
42-40 20 4 110.9 mm 101.6 mm 29.0 mm
42-56 28 4 153.9 mm 144.7 mm 29.0 mm
BS-W-PD 48-17-48-17
BS-W-PD 48-16-48-16
48-20 10 6 43.4 mm 34.0 mm 38.1 mm
48-24 12 6 51.6 mm 42.2 mm 38.1 mm
48-32 16 6 67.6 mm 58.7 mm 38.1 mm
BS-W-PD 60-20-48-18
BS-W-PD 60-18-48-18
60-8 4 5 17.3 mm 11 mm 25.4 mm
60-12 6 5 25.9 mm 19.6 mm 25.4 mm
60-24 12 5 50.8 mm 44.2 mm 25.4 mm
60-42 21 5 86.9 mm 80.3 mm 25.4 mm
60-54 27 5 111.8 mm 103.9 mm 25.4 mm
60-82 41 5 168.4 mm 160.5 mm 25.4 mm
BS-W-PD 60-18-60-18 6060-28 14 5 47.8 mm 39.9 mm 25.4 mm
6060-40 20 6 67.3 mm 59.4 mm 35.6 mm
6060-92 46 6 151.9 mm 143.3 mm 35.6 mm

Typical Drive Shaft Arrangement:-


Suggested Tracking Shaft (Transfer or Idle Shaft) Optional Arrangements:-


Belt circuit should be arranged such that there is sufficient wrap around the sprocket to ensure that the teeth remain engaged with the mesh.

Conveyor Circuit Design Guidelines – Friction Driven

When designing your conveyor it is imperative that you work within the capabilities of the belt selected.

Friction drive belt systems are various and generally depend upon the application in question.  They can vary across temperature range applications from low temperature cryogenic up to 1150°C.  The limitations in general are based upon the product, process and available space.  Click here to download the Conveyor Circuit Design Guidelines.

If you are unsure as to the details enclosed then please call the Technical Sales Team at Wire Belt Company +44 (0) 1795 421771
 

Balanced Spiral Belt Identification

The Wire Belt Company woven wire mesh conveyor belt product code is made up as follows:-

XXX  AA-BB-CC-DD

XXX = Type of belt / Weave (e.g  BSW , CLRW)
AA = The number of coil pitches (spirals) per 305mm (12”) of belt width
BB = The gauge (diameter) of the wire used for the coil wires (spirals)*
CC = The number of connectors (connecting crimp/pins) per 305mm (12”) of belt length
DD = The gauge (diameter) of the wire used for the connecting crimp wires/pins

*If the coil is of flat wire section then this will be expressed as width x depth or the gauge 'F' (i.e. 16F)



The above example indicates a lateral coil pitch count of 48 (8 pitches/2” = 48 pitches/12”of width)
With a longitudinal crimp wire pitch count of 24 (4 pitches/2” = 24 pitches/12” of length)
 
Other suppliers may express the code in the following format:-

XXX   AA-CC/BB-DD
 

Improved Balanced Spiral Belt Identification Codes

The Wire Belt Company woven wire mesh conveyor belt product code is made up as follows:-

IBS  AA-BB-CC-DD

IBS= Type of belt / Weave
AA = The number of coil pitches (spirals) per 305mm (12”) of belt width
BB = The gauge (diameter) of the wire used for the coil wires (spirals)*
CC= The number of straight cross wire connector pins per 305mm (12”) of belt length
DD= The gauge (diameter) of the wire used for the connecting pins

* If the coil is of flat wire section then this will be expressed as width x depth or the gauge ‘F’ (i.e. 16F)



The above example indicates a lateral coil pitch count of 42 (7 pitches/2” = 48 pitches/12”of width)

With a longitudinal crimp wire pitch count of 24 (4 pitches/2” = 24 pitches/12” of length)
 
 

Balanced Spiral Woven Belting Installation Guidelines

Friction and Positive Driven

Preparation

 Before installing a new belt, always check the conveyor structure;
  • Shafts to be at 90̊ to direction of travel, and horizontal.
  • Rollers to be free to rotate.
  • Positive Drive Belts - Sprockets to be correctly positioned, and aligned.
  • Belt supporting surfaces are smooth and level with adequate belt edge clearance. Check that there are no parts of the structure that can catch the belt.
  • If a take-up mechanism is fitted, ensure that it is functioning correctly.

Caution!

It is a characteristic of spiral mesh belts, that coils can twist and so tighten the mesh pitch. This can happen in packing/transit, and in the process of feeding the belt on to the conveyor. Whilst the belt is first being installed, it should be relatively easy to shake out these twisted coils (or scrape them flat). If this is not done, the twisted coils will lock in place as tension is applied. If the conveyor is then run, with twisted coils, belt damaged can occur.




Installation Procedure

Tools you will need:
  • Safety glasses
  • Flat end pliers
  • Needle nose pliers
  • Side cutting pliers
  • Cable ties/soft wire/rope (optional)
  • Pulling rope (optional – for long new conveyor installations)
  • Necessary tools for conveyor belt take up adjuster
  • Welding set to complete the belt edge at the join strand
  1. First ensure that the electrical supply to the conveyor is turned off and the power supply locked out.
  2. Release any conveyor belt tension take up mechanism to allow maximum adjustment during use.
  3. There is no top or bottom side to the belt – either side can be up
  4. Direction of travel – the spiral leads the crimp connector to which it is welded.
  5. The belting should be pulled through the conveyor circuit until the two ends meet.  There are 2 approaches to this:
a)Where the belt is being replaced for a belt in situ on the conveyor. In this instance the existing belt would be cut at the non-drive (normally idle infeed end) and then temporarily attach the lead of the new belt roll to the lagging end of the existing belt.  By means of supporting the new belt roll (whether on a roll or layered on a pallet) you will be able to carefully drive the belt (operate at slow speed) into the conveyor using the existing belt – always maintain suitable belt tension to ensure there is no belt slip on the drive roll.  Whilst the belt is being driven in the old belt should be collected and layered carefully onto a pallet or such like for disposal.  Then continue the process from step 6.
         
b)If fitting the belt to a conveyor where there is no existing belt (such as a new installation) then the belt will have to be fed through the conveyor circuit by hand.  For long conveyors you will need to attach a steel bar to the leading edge of the belt with cable ties or suchlike (see below). To this bar then attach a pulling rope which is first fed through the conveyor to the discharge.  From here the belt can be pulled through the carry way part of the circuit.  Once the lead edge of the belt is at the discharge end the rope should then be fed back through the return way of the belt circuit to the infeed end.  It can then be pulled (maybe with slow speed drive assistance) to the infeed end.  Then continue on from step 6.


6. Excess mesh should be cut off whilst maintaining the correct right/left hand repeat pattern of the coil mesh.  A     left hand coil at one end of the belt needs to meet a right hand coil at the other end.
7. Temporarily, the two ends can be tied together; this may make assembly easier
8. The mesh is joined by inserting a crimp wire through the intermeshing coils at each end of the belt.
9. The crimp wire should then be cut to length and welded to the corresponding coil wire, at the edges,         maintaining the continuous pattern of the belting.

10. Re-tension the belt enough to maintain adequate drive without over tensioning the belt.
11. Check there are no belt parts or tools left on, or in the conveyor.
12. Remove power lock off and then start the conveyor and test run under slow running conditions before running      at normal operating speed.
 
  • Longer belts may be supplied in sections and therefore multiple belt joins will be necessary.
  • If the belt drive shaft is fitted with mesh engaging positive drive sprockets then you will have to disengage the geared motor drive from the drive shaft or operate the conveyor in a slow speed mode to allow the return way belt section to be pulled back whilst being driven.  Always ensure that the new belt section locates correctly into sprocket teeth.
  • If the belt is fitted with side chains and cross rods then it will also be necessary to maintain the side chain pattern when joining the belt.  Side chain driven belts are supplied with two sets of chain connecting links.

Operating Notes!

Sometimes a belt can show signs of surging, hunting or jerking. What could be happening may be an effect sometimes referred to as “slip-stick” which can afflict some longer slow running conveyors using many belt styles. The belt can act something like a spring. The idle end of the belt can remain stationary until belt tension increases to the point that static friction is overcome; the belt can then surge ahead and the resulting drop in tension may then allow the belt to slow, or even stop. The cycle of surging can then become repetitive; if this problem persists then consult the designer or manufacturer of the conveyor.
This effect is normally a function of the following:-
  • Low belt speed.
  • Belt tension.
  • Nature of belt support (coefficient of friction)
To help alleviate some of this effect it may be necessary to change any of the above or a combination of all.
 

Balanced Spiral – Positive Drive Belt Specifications

Mesh Type Specification Coding Nominal Belt Thickness
(mm)
Lateral
Pitch  of Coil wire(mm)
Coil Wire Dia. (mm) Crimped Cross Wire Pitch down length (mm) Crimped Cross Wire Dia (mm)
BSW-PD 18-16-16-16 7.7 16.94 1.63 19.05 1.63
BSW-PD 18-14-16-14 8.9 16.94 2.03 19.05 2.03
BSW-PD 30-17-24-17 7.3 10.16 1.42 12.7 1.42
BSW-PD 30-16-24-16 6.7 10.16 1.63 12.7 1.63
BSW-PD 42-18-36-18 6.0 7.26 1.22 8.47 1.22
BSW-PD 42-17-36-17 6.0 7.26 1.42 8.47 1.42
BSW-PD 42-16-36-16 6.4 7.26 1.63 8.47 1.63
BSW-PD 48-17-48-17 6.1 6.35 1.42 6.35 1.42
BSW-PD 48-16-48-16 6.4 6.35 1.63 6.35 1.63
BSW-PD 60-20-48-18 4.0 5.08 0.91 6.35 1.22
BSW-PD 60-18-48-18 5.2 5.08 1.22 6.35 1.22
BSW-PD 60-18-60-18 5.6 5.08 1.22 5.08 1.22
 
Specifications are also available using a flattened coil wire.  Please consult with our Technical Sales Engineers for the range and availability.

All specifications are supplied with welded edge only.

A range of sprockets in UHMW Polyethylene, POM or Stainless Steel is available to suit each mesh specification.


Typical Standard Bi-Directional Positive Drive Sprocket
(Drives at every 2nd longitudinal crimp wire pitch)
 
Note:  Non-standard moulded versions available for uni-directional drive available to special order.  If sprockets are required for exact replacement then forward picture of existing sprockets to confirm.


Typical Drive Shaft Set-up with Balanced Spiral Flat Wire Belting and Bi-Directional Sprockets.