 |
 |
Idlers
Magnetic Separators
Impact Beds
Belt Tensioning Systems
Conveyor Accessories Information
Engineering & Technical Information
Safety, Operation & Maintenance Manuals
Media Room
Premium Return Roll Guard
Eco-Friendly Conveying
Rebuild and Relag Pulleys with Douglas®
Help to protect the environment and your bottom line by recycling old pulleys with Douglas®. Structurally intact pulleys can be cleaned and re-lagged at around roughly 25% the cost of a new pulley. If necessary the pulley can be repaired and new bushings, bearings and shafting can be provided to complete the assembly. The pulley is then ready to return to service or be set aside as a ready spare to help avoid future downtime and provide peace of mind.
 |
 |
Before… headed to the junk yard! |
After… headed back into service! |
Vulcanized Pulley Lagging
Benefits
- As much as 50% increase in coefficient of friction over non lagged pulleys
- Improves Belt Tracking
- Protects pulley face from wear and extends pulley service life
- Herringbone and Diamond Grooves shed water and dirt promoting a self-cleaning effect
Construction
All pulleys are vulcanized in house using state of the art computer controlled autoclaves and our patented bonding process.
If you have an application that requires exact concentricity or T.I.R. we suggest ordering machined lagging with the tolerance specified.
Rubber Lagging Detail Chart
Standard Thicknesses |
Standard Grooving Patterns |
Standard Material |
Standard Durometer |
Special Durometers |
Special Materials |
1/4”, 3/8”, 1/2”, 3/4” |
Plain Wrap Impression*, Herringbone**, Diamond |
SBR |
60-65 Shore A |
40, 80 |
MSHA, Nitrile, Neoprene, EPDM, SCOF, Tan Neoprene |
 |
 |
*+/- 1/8” on rubber thickness & no concentricity tolerance guaranteed, natural variations in material thicknesses are normal. Machined finish lagging is available for specific tolerance requirements. **Specify direction of rotation if Douglas is to install shafting – Groove will normally run with the apex of the pattern leading. |
Diamond Groove |
Herringbone/Chevron Groove |
Ceramic Pulley Lagging
Benefits
- As much as twice the coefficient of friction over non lagged pulleys
- As much as 50% higher coefficient of friction over standard rubber lagging
- Virtually eliminates belt slippage
- Lower belt tension and less take-up weight increases life of components and belt
- Easily sheds water and dirt
- Belt tension in the take-up system is reduced
- The counter-weight mass is reduced
- The use of ceramic lagging will reduce the shaft and bearing sizes required
- Drive pulleys with ceramic lagging will last up to 8 times longer than standard SBR rubber lagged pulleys
- Belt tracking is vastly improved
- On many type 3 and 4 belt conveyors required horsepower can be reduced up to 1.3%
Construction
Unequalled wear performance, durability and load carrying capacities are achieved due to special wear resistant ceramic tiles coupled with our advanced rubber compound and bonding process. Unique cross hatched feature of our square ceramic tiles helps to ensure tile retention and virtually eliminates tile loss during the critical initial break in period of the lagging.
Ceramic Lagging Detail Chart
Tile Stub Height |
Rubber Thickness Beneath Tile |
Tile Length & Width |
# of Stubs per Tile |
Gripping Surface Per Sq Ft |
Rubber Shore A Durometer |
Rubber Tensile Strength |
.050” |
.500” |
1” x 1” |
18 |
29.6 Sq In |
65 |
3,400 PSI |
Replaceable Rim Lagging®
Benefits
- Saves up to 70% on labor costs compared to other styles of replaceable lagging
- RRL® covers the pulley in a protective shell of steel and abrasion resistant rubber
- No layout necessary to fit to existing pulleys
- No cutting necessary: eliminates waste and scrap pieces
- Reduces conveyor downtime and reduces costs associated with pulley installation and removal
- Minimum gap between sections means the highest possible level of belt to pulley contact and results in a higher level of traction
- Order RRL® with any new Douglas® pulley and we will install it for free
- Install RRL® on a new pulley in our plant or install it on an existing pulley in the field.
Construction
All RRL® is vulcanized in house using state of the art computer controlled autoclaves. RRL® is manufactured with 1/2” 60-65 durometer SBR compound suitable for a wide variety of applications and is bonded to a 3/16” solid steel backing plate and ROLLED CROWN FACE standard. Flat face is available. Diamond grooving is standard making the mounting of RRL® fast and easy.
Ceramic RRL® is also available.
Replaceable Rim Lagging Requirement Chart
Diameter |
8 |
10 |
12 |
14 |
16 |
18 |
20 |
24 |
30 |
36 |
42 |
48 |
Weight P.I.L. |
1.47 |
1.74 |
2.09 |
2.44 |
2.8 |
3.48 |
3.63 |
4.18 |
5.23 |
6.28 |
7.33 |
8.37 |
# of Segments Required |
2 |
3 |
3 |
3 |
4 |
4 |
4 |
4 |
4 |
5 |
5 |
5 |
Click here to download a PDF of the Eco-Friendly Lagging Brochure. (5.1MB)
