Primary vs. Secondary Conveyor Belt Cleaners: Which One Do You Really Need?

Are you tired of dealing with carryback on your conveyor belts? This frustrating problem causes material buildup, wastes valuable product, and increases your cleanup time and maintenance costs.

The best solution involves using both primary and secondary cleaners together. A primary cleaner removes the bulk material at the head pulley[^1], while a secondary cleaner scrapes off the remaining fine, sticky particles further down the beltline for a comprehensive cleaning system.

Many people I talk to focus heavily on the primary cleaner, thinking it's the most important part of the system. They believe a powerful primary cleaner should solve all their problems. But often, that’s not the whole story. The real key to a truly clean belt and an efficient operation isn't just about choosing one powerful product. It's about understanding how different components work together to create a complete solution. Let's break down how this partnership between primary and secondary cleaners actually works.

What's the Real Job of a Primary Belt Cleaner?

You see material clinging to your belt as it goes over the head pulley. This buildup can cause the belt to wander and can damage both the belt and the pulley.

A primary belt cleaner is your first line of defense. It is installed directly against the head pulley to scrape off the majority of the conveyed material right at the point of discharge. Its main purpose is to handle the heavy lifting before the material has a chance to get back into the system.

Think of the primary cleaner as the workhorse of your cleaning system. Its job is to remove the big stuff—the bulk of the load that sticks to the belt surface. Typically, a good primary cleaner can remove about 60-80% of the initial carryback[^2]. It's positioned on the face of the head pulley, just below the trajectory of the material flow. This placement is critical because it attacks the carryback while it's still loose and before the belt changes direction. The blades are usually made from tough materials like <a href="/tag/polyurethane" target="_blank"><strong>polyurethane</strong></a> or tungsten carbide[^3] to withstand the constant impact and abrasion from the bulk material. It’s an essential first step, but for many applications, it’s not the final one.

Primary Cleaner: Key Characteristics

Why Is a Secondary Cleaner More Than Just a Backup?

You've installed a primary cleaner, but a fine, sticky film of material still coats the belt. This thin layer builds up on rollers and creates a mess along the conveyor line.

A secondary cleaner is a precision tool, not just a backup. It is installed after the head pulley and is designed specifically to remove the fine, tacky residue that the primary cleaner inevitably misses. It ensures a much higher level of cleanliness.

If the primary cleaner is the workhorse, the secondary cleaner is the finisher. Its job is to handle what's left behind. After the belt leaves the head pulley, it passes over the secondary cleaner, which is positioned a bit further down the line. Here, the belt is usually more stable, allowing the secondary cleaner’s blades to apply consistent pressure and shear off the stubborn, sticky film of fine particles or moisture. This is especially important when you're handling materials like wet clay, fine dust, or sticky agricultural products. Without a secondary cleaner, this fine residue would be carried back along the return side of the conveyor[^4], causing buildup on idlers, pulleys, and creating significant cleanup headaches. It’s the key to moving from a "mostly clean" belt to a "truly clean" belt.

When is a Secondary Cleaner Essential?

How Do You Combine Them for the Best Results?

You've invested in a cleaning system, but you're still not getting the results you want. You're frustrated and wondering if you made the wrong choice or if your material is just too difficult.

The most effective solution is a multi-stage cleaning system. By using a primary cleaner for bulk removal and a secondary cleaner for fine-tuning[^7], you create a synergy where each cleaner performs the job it was designed for, leading to a cleaner belt and a more efficient operation.

You shouldn't think of it as choosing one or the other. The best strategy is to use them together. I saw this firsthand with a client in Portugal. He designs drying equipment for olive by-products[^8], and he had recommended a primary cleaner for one of his customers. The problem was, a lot of fine, oily residue was still sticking to the belt after it passed the primary cleaner. He found us through Google, and we talked about his situation. Based on our advice, he ordered a few of our secondary cleaners to try. The result was fantastic. The secondary cleaner scraped off that stubborn film perfectly[^9]. He was very satisfied because the belts were finally running clean, which improved the efficiency of the whole drying process. His story is a perfect example of why a system approach is so important.

Simple Selection Guide

Conclusion

Don't view it as a choice between primary or secondary cleaners. The best investment for belt life, safety, and efficiency is a system that uses both working in tandem.

[^1]: "Design improvements and fabrication of conveyor belt cleaner ...", https://www.academia.edu/145639958/Design_improvements_and_fabrication_of_conveyor_belt_cleaner_and_washing_system_at_Westports_Malaysia. This source explains the role of primary cleaners in conveyor systems, emphasizing their placement and effectiveness in removing bulk material. Evidence role: mechanism; source type: education. Supports: A primary cleaner removes the bulk material at the head pulley.. [^2]: "[PDF] Basic Parameters of Conveyor Belt Cleaning - CDC Stacks", https://stacks.cdc.gov/view/cdc/10327/cdc_10327_DS1.pdf. This source provides statistical data on the efficiency of primary belt cleaners in removing carryback material. Evidence role: statistic; source type: research. Supports: Typically, a good primary cleaner can remove about 60-80% of the initial carryback.. Scope note: The percentage may vary depending on material type and cleaner design. [^3]: "Blow Down Air Knife System", https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1940&context=mesp. This source discusses the materials commonly used for conveyor belt cleaner blades, including their durability and suitability for various applications. Evidence role: general_support; source type: education. Supports: The blades are usually made from tough materials like polyurethane or tungsten carbide.. Scope note: Material choice may depend on specific industry requirements. [^4]: "Design improvements and fabrication of conveyor belt cleaner ...", https://www.academia.edu/145639958/Design_improvements_and_fabrication_of_conveyor_belt_cleaner_and_washing_system_at_Westports_Malaysia. This source explains the consequences of not using secondary cleaners, including residue buildup on conveyor components. Evidence role: mechanism; source type: education. Supports: Without a secondary cleaner, this fine residue would be carried back along the return side of the conveyor.. Scope note: The extent of residue buildup may vary by material type. [^5]: "From one species to another: A review on the interaction ...", https://pmc.ncbi.nlm.nih.gov/articles/PMC6852270/. This source provides a comparison of primary and secondary cleaners, detailing their effectiveness for different material types. Evidence role: expert_consensus; source type: research. Supports: Primary Cleaner Alone?. Scope note: Effectiveness may vary based on specific material properties. [^6]: "High Performance Secondary Belt Cleaners", https://www.martin-eng.com/content/product_subcategory/485/secondary-conveyor-belt-cleaners-products. This source supports the recommendation of secondary cleaners for handling fine, sticky, or wet materials in conveyor systems. Evidence role: expert_consensus; source type: institution. Supports: Secondary Cleaner Recommended?. Scope note: Recommendations may not apply universally to all conveyor setups. [^7]: "Basic Parameters of Conveyor Belt Cleaning", https://stacks.cdc.gov/view/cdc/10327/cdc_10327_DS1.pdf. This source supports the effectiveness of combining primary and secondary cleaners for comprehensive conveyor belt cleaning. Evidence role: expert_consensus; source type: research. Supports: By using a primary cleaner for bulk removal and a secondary cleaner for fine-tuning.. Scope note: Effectiveness may depend on specific system configurations. [^8]: "Olive-oil Milling Leftovers Scrutinized in New ARS Studies - USDA ARS", https://www.ars.usda.gov/news-events/news/research-news/2013/olive-oil-milling-leftovers-scrutinized-in-new-ars-studies/. This source provides context about the use of conveyor belt cleaners in agricultural processing, specifically olive by-products. Evidence role: case_reference; source type: other. Supports: He designs drying equipment for olive by-products.. Scope note: The example is specific to olive by-products and may not generalize to other industries. [^9]: "Safety Evaluation of Conveyor Belt Cleaning Systems", http://stacks.cdc.gov/view/cdc/206680. This source discusses the effectiveness of secondary cleaners in removing fine residues, as demonstrated in specific case studies. Evidence role: case_reference; source type: research. Supports: The secondary cleaner scraped off that stubborn film perfectly.. Scope note: The effectiveness may vary depending on material and cleaner design. [^10]: "Basic Parameters of Conveyor Belt Cleaning", https://stacks.cdc.gov/view/cdc/10327/cdc_10327_DS1.pdf. This source explains how multi-stage cleaning systems reduce carryback, lower maintenance needs, and improve conveyor component longevity. Evidence role: mechanism; source type: education. Supports: Minimizes carryback, reduces cleanup, and extends component life.. Scope note: The benefits may depend on system design and material type.