Description
Application
The primary aim is to prevent wear of the pulley shell that may lead to the need for an expensive replacement of the whole pulley. Many mines spend considerable time measuring the thickness of the lagging on the pulleys once in service to keep track of replacement requirements. This normally involves operators using ultrasound techniques on the pulley surface during shutdowns to record the remaining thickness of the lagging. A visual alarm while conveyor is running reduces likelihood of pulley shell wear as well as maintenance hours for lagging control.
Key features and benefits
- Rubber backing developed in conjunction with ARDL (Akron Rubber Development Laboratory) to retain flexibility at low temperature (-50°C).
- High performance abrasion resistant synthetic elastomer.
- Coloured wear indicator layer below abrasion resistant layer.
- Proven bonding system between abrasion resistant synthetic elastomer and CN backing coloured rubber.
- Coloured wear indicator (Blue for SBR and Red for FRAS).
- High quality rubber formulations designed for good bonding, resistance to degradation by outdoor exposure, and good abrasion resistance.
- To be applied though hot vulcanising method to eliminate the chance of lagging debonding from pulley shell and separation on joins.
- Can be supplied in a range of thicknesses (15, 20 and 25mm).
- Suitable for long term service at temperatures from - 40°C to +70°C.
Design
Elastotec Wear Indicator Rubber Lagging has a bottom coloured rubber layer to indicate the need for lagging replacement.
Simple system that provides an easy to recognize visual indicator that the abrasion resistant diamond lagging layer has worn through and should be scheduled for replacement. Provides a margin of safety by identifying wear before contact / damage to the pulley shell occurs.
Coloured logo
Repeating diamond pattern.
Abrasion and tear resistance rubber.
3 cutting location sipe
Edge sipe
Wear indicator CN buffed adhesion layer
Uncured bonding layer
Plastic release liner
Rubber Specifications
| NAT | FRAS | |
|---|---|---|
| Polymer | SBR | Blend |
| Tensile strength (MPa) min ISO37 | 18.0 | 16.0 |
| % Elongation min ISO37 | 550% | 500% |
| Hardness (shore A) ISO868 | 65+/-5 | 65+/-5 |
| Abrasion resistance max vol. loss ISO 4649 method A (non-rotating) | 70mm3 | 150mm3 |
| FRAS - MDG 3608 | N/A | PASS |
| Heat ageing (Property change after 70°C 168hs) | Tensile strength +1% Elongation -15% Hardness 5 points | Tensile strength +5% Elongation -1% Hardness 3 points |
| Continuous operating temperature | -40/+70°C | -40/+70°C |
Elastotec lagging can be applied to pulleys by cold bonding or by hot vulcanisation.
ELASTOTEC COLD BONDING
PULLEY LAGGING
Elastotec Cold Bonding Rubber Lagging has the CN buffed bonding layer packed in plastic to protect and keep it fresh and free from contamination until application to the pulley.
A rubber tear bond is achieved by using Elastotec Metal Primer 2205 and Elastotec Cold Bonding Adhesive to chemically interlock with the CN bonding layer, making a strong interface between the layers.
An Elastotec approved applicator using the Elastotec application procedure will achieve reliable adhesion levels that exceed the 9 N/mm industry standard and are typically at 12 N/mm.
ELASTOTEC HOT VULCANISING PULLEY LAGGING
Elastotec Hot Vulcanising Rubber Lagging has a 1.2mm thick uncured rubber layer applied to the back and sides of the lagging. Hot Vulcanising Lagging is supplied packed in plastic to protect and keep the uncured bonding layer fresh and free from contamination until application to the pulley. Application by a trained Elastotec approved applicator using the Elastotec application procedures will guarantee a 100% rubber tear bond between the lagging and the pulley shell with typical adhesion values exceeding 20 N/mm.Lagging Specifications – Wear Indicator Lagging
HOT VULCANISED - NAT
| PRODUCT | CODE | WIDTH | THICKNESS | LENGTH | WEIGHT/lm |
|---|---|---|---|---|---|
| Wear Indicator Lagging 15mm | ELA-WI-DIA-N-15V | 251mm-255mm | 16mm-17.2mm | 9.7m | 6.50kg |
| Wear Indicator Lagging 20mm | ELA-WI-DIA-N-20V | 251mm-255mm | 16mm-17.2mm | 9.7m | 8.32kg |
| Wear Indicator Lagging 25mm | ELA-WI-DIA-N-25V | 251mm-255mm | 26mm-27.2mm | 9.7m | 10.32kg |
Product code for different lengths: Add 5-digit number indicating length in mm.
Strip length to always be 100mm longer than face width to allow overhang for trimming after application.
Example:
Roll: 25mm 9.7m roll hot vulcanised product code: ELA-WI-DIA-N-20V-09700
Strip: 15mm hot vulcanising 1.2m strip length product code: ELA-WI-DIA-N-15V-01200
Thickness variation (all strips/pulley) +/-0.5mm
Ceramic lagging with thickness > 15mm only recommended for pulleys with diameters over 600mm.
Storage recommendations:
- Stock usage based on a first-in first-out method (FIFO).
- The storage room for lagging must be cool, dry and dust-free.
- Avoid storage places near sources of ozone generating equipment.
- Do not store outside.
- Avoid storage in direct sunlight and strong artificial light as UV light can damage the products and may lead to a premature ageing.
- Under no circumstances should fuels, lubricants, acids, disinfectants, solvents or other chemicals be stored in the same storage area.
- Keep the storage place clean. Protect the material from dust, water etc. with suitable coverings.
- Allow 24 hours before use when lagging is removed from cold storage.
Shelf life:
COLD BONDING LAGGING AND WEAR PANELS
- Stored <25°C 3 years shelf life
- Light buffing of bonding surfaces is recommended if over 4 months from production date
HOT VULCANISED LAGGING AND WEAR PANELS
- <7°C and away from UV and ozone generating equipment 12 months. Products stored for longer than 6 months will need to be re-tested for adhesion before being used, and the recommended shelf life is 12 months.
ADHESIVES AND PRIMERS
- Store in flammable goods cabinet
- Stored <25°C
- Shelf life:
- Primers 2 years
- Cold bonding adhesive 2 years
- Hot vulcanising adhesive 12 months
- Direct bond adhesive 2 years
Products stored under the above conditions for longer periods of time than recommended need to be re-tested for adhesion before being used. If any doubts on storage recommendations, contact Elastotec.
