Belt Cleaners · Primary · Zone 03
Primary scrapers install against the belt at the head-pulley face, below the discharge trajectory, where they take off most of the residual material in a single pass. Blade platform and compound are matched to pulley diameter, belt speed and material.
Mini-Skalper® Primary Scraper
01 / Scraper architecture
The architecture, up close.
A primary scraper is a blade, a mounting, and a tensioner working as one — mounted at a positive angle against the head-pulley face, below the discharge trajectory, where the belt is curved and fully supported.
- 01
High-performance polyurethane blade
Tru-Trac formulates its own urethane compounds for tensile strength and DIN abrasion resistance, with a unique profile that renews its cleaning edge through the life of the blade.
- 02
Blade-wear indicator
Monitor blade wear at a glance, without shutting the system down for inspection.
- 03
Zinc-plated mounting tube and brackets
Corrosion resistance across varied duties, with a quick-change blade that swaps out in minutes without tools.
- 04
E-Z Torque tensioner
A patented self-adjusting spring holds constant tension against the pulley through the entire life of the blade; tensioned and maintained from one side of the conveyor.
- 05
Belt-friendly contact
Positive-angle cleaning at the head-pulley face removes the bulk of the material without damaging the belt.
Architecture · up close
02 / The range
The primary range, by duty.
Names, blade platforms, CEMA classes and envelopes are from the catalogue; final specification is confirmed by Tru-Trac engineering.
Primary scrapers
Mini-Skalper® Primary Scraper
Blade platform: 116 mm · CEMA Class 2
- Max belt speed: 2.5 m/s.
- Pulley diameter: 150–550 mm.
- For small-diameter pulleys under 400 mm (16") or tight installation locations.
- Patented one-piece blade with blade-wear indicator; E-Z Torque tensioning available.
- Applications: aggregate, sand & gravel, redi-mix & asphalt, cement, wood processing, recycling.
Prima® Primary Scraper
Blade platform: 142 mm · CEMA Class 3
- Max belt speed: 3.0 m/s.
- Pulley diameter: 250–500 mm.
- Patented blade maintains an effective cleaning edge through its life; zinc-plated mounting tube and brackets.
- E-Z Torque tensioner (self-adjusting).
- Applications: aggregate, ready-mix, asphalt, recycling, sand & gravel.
Skalper® Primary Scraper
Blade platform: 186 mm · CEMA Class 4
- Max belt speed: 4 m/s.
- Pulley diameter: 300–900 mm.
- Belt width: 450–1200 mm.
- Quick-change blade (no tools); blade-wear indicator; unique renewing edge profile.
- E-Z Torque tensioner with lifetime warranty; maintained from one side of the conveyor.
- Applications: coal-fired power, hard rock mining, steel mills, iron ore, aggregate & mineral (phosphate, potash, salt) mining.
Super-Skalper® Primary Scraper
Blade platform: 256 mm · CEMA Class 5
- Max belt speed: 6.0 m/s.
- Pulley diameter: 800 mm and above.
- For high-speed belts, large head pulleys and high material volumes.
- Patented E-Z Torque torque-spring tensioner (one-time tensioning); blade-wear indicator.
- Applications: underground & hard rock mining, metals (copper/gold), steel mills, iron ore, bulk shipping terminals, coal-fired power, coal preparation.
Primary blade compounds
Skalper IV
Compound: urethane, abrasion-resistant.
- Temperature range: −28 to 82 °C.
- Shore hardness: 85.
- Max belt speed: 4 m/s.
- Use with mechanical fasteners: yes.
Skalper HT
Compound: urethane, high-temperature.
- Temperature range: −28 to 107 °C.
- Shore hardness: 85.
- Max belt speed: 6 m/s.
- Use with mechanical fasteners: yes.
Skalper UHT
Compound: urethane, ultra-high-temperature.
- Temperature range: −28 to 148 °C.
- Shore hardness: 95.
- Max belt speed: 6 m/s.
- Use with mechanical fasteners: no.
Primary tensioners
E-Z Torque Tensioner
- Patented self-adjusting spring; maintains constant tension through blade life.
Prima Tensioner
- 48 mm shaft · mild steel, zinc-plated.
Standard Tensioner
- 60 mm shaft · stainless steel · lifetime guarantee.
HD Tensioner
- 60 mm shaft · stainless steel · heavy-duty spring for more demanding applications · lifetime guarantee.
Note: use a double-tension configuration for blade widths of 1350 mm and above.
