Ceramic Pulley Lagging

LAGGING RECOMMENDATIONS FOR
LONGEST SERVICE LIFE

GENERAL CONDITIONS

Recommendations are for engineered pulleys operating in a temperature range from -45 c to +60 c in dry and wet conditions.
Operation in contact with chemicals such as oil,bitumin etc requires specialist analysis – contact Elastotec.

BONDING SYSTEM

PULLEY ELASTOTEC RECOMMENDATION REASON WARRANTY
New pulleys Hot Vulcanised Bonding
  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
Elastotec warranty in place
Refurbished pulleys Hot Vulcanised Bonding
  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
Elastotec warranty in place
Pulley lagging repair on the conveyor Cold Vulcanised Bonding Only bonding system suitable for on site lagging application
– emergency repairs only where pulley cannot be removed from the conveyor.
Not Applicable

LAGGING SELECTION

PULLEY ELASTOTEC RECOMMENDATION REASON WARRANTY
DRIVE PULLEYS
Hot Vulcanised Ceramic Lagging

(Thickness to be determined by Lagging Analyst analysis.)

  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
  • No tile debonding
  • Kind to conveyor belt (compared to Direct Bond Ceramic Lagging)
  •  3-5 times longer service life than rubber lagging
  • Co-efficient of friction remains constant at 1.0 regardless of operating temperature, wet, dry or icy operating conditions i.e. no slippage or loss of drive.
Elastotec warranty in place
NON-DRIVE PULLEYS

Non-drive pulleys requiring maximum lagging service life.

Conditions:
• No Carry back exists.
• For High Tension (>1,000 kN/m) contact belt surface must be uniform.

1)

Hot Vulcanised Ceramic Lagging
  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
  • No tile debonding
  • 3-5 times longer service life than rubber lagging
Elastotec warranty in place
Non-drive pulleys where there are concerns about buildup from carryback i.e. pulleys in contact with carry side of the belt. 2)

Hot Vulcanised Polyurethane (PU) Lagging
  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
  • No PU debonding
  • 3-5 times longer service life than rubber lagging
  • Kind to conveyor belt (compared to ceramic lagging)
  • Resists build-up
Elastotec warranty in place
High tension non drive pulleys and pulleys in contact with an uneven belt surface. 3)

Hot Vulcanised highly abrasion resistant Rubber Lagging with hardness 60+/-5 shore A
  • Eliminates three of the most common causes of lagging failure:
    – debonding from the pulley shell
    – edge lifting
    – separation, lifting and corrosion at the joints between lagging strips.
  • Longer service life than standard rubber lagging
  • Kind to conveyor belt (compared to ceramic lagging)
  • Resists build-up
  • Suited to high tension (>1,000 kN/m) non-drive pulleys particularly where the pulley contacts the carry (dirty) side of the belt and/or the belt surface is not uniform
Elastotec warranty in place

IMPORTANT NOTES:

  1. Hot Vulcanised Bonding should be used when ever the pulley has been removed from the conveyor.
  2. Be cautious using Hot Vulcanised Ceramic or PU Lagging from suppliers that purchase Cold Vulcanised Lagging and then apply this to the pulley using their own Hot Vulcanising Techniques. Elastotec Hot Vulcanised Lagging uses rubber and PU compounds and tile bonding systems that are designed to handle autoclave curing with no degradation.
  3. Cold Vulcanised Bonding should only be used for emergency lagging repairs for pulleys on conveyors.
  4. Direct Bond Ceramic Lagging can be used for both Drive and Non-drive pulleys but requires detailed engineering analysis to ensure that there is no damage to the belt bottom cover and no debonding of the lagging due to flexing of the pulley shell. Contact Elastotec for specific design assistance.
  5. High tension pulleys require detailed evaluation of the operating conditions, belt condition, likelyhood of carry back etc. as any uneven tension across the pulley surface may accelerate lagging failure.