Why Exactly Does a Cam Rotor Pump Solve the Problem of Frequent Pump Blockage and Solidification During High-Viscosity Resin Discharge? Overview

On fine chemical production lines, the discharge station is often the node most prone to trouble across the entire line. With high-viscosity resin in particular, material flowability at room temperature is extremely poor; once the unit sits idle for any length of time, the material inside the pump chamber gradually solidifies and cakes, and on restart the resistance spikes at best and the pump seizes completely at worst. A certain new-materials manufacturer was long plagued by this exact problem until it switched to a properly matched conveying solution, at which point the situation was fundamentally turned around.

-Bonve Pump Cam-type Twin Rotor Pump-

Original Working Conditions and On-site Pain Points

This manufacturer specializes in polyurethane and resin products; finished-product discharge originally relied on conventional pump types. Resin materials exhibit several prominent characteristics: extremely high room-temperature viscosity, with the viscosity range swinging from several hundred centipoise all the way to ten thousand, and marked differences between batches; once the material dwells in the pump chamber for any extended period after shutdown, it begins to crystallize and solidify; and during transfer, if local shear is excessive, the material temperature rises and premature pre-polymerization occurs, directly degrading finished-product quality.

On site, three problems recurred endlessly:

First, solidification and blockage forced frequent disassembly and cleaning. Whenever the interval between batch runs stretched a little longer, resin would solidify and cake inside the pump body; on restart, the pump shaft seized, and manual teardown and cleaning was extraordinarily time-consuming, frequently delaying the feed schedule of the next batch.

Second, viscosity swings exceeded the operating envelope of conventional pumps. Across a span from several hundred to ten thousand centipoise, ordinary pump types struggled to maintain stable delivery over the full range; compounded by structurally induced shear that locally heated the material, a small fraction of resin polymerized prematurely, and finished-product specifications began to fluctuate.

Third, seal-face abrasion by particles triggered leakage. Fine particles in the resin continuously adhered to the sealing faces, accelerating wear; the replacement frequency of sealing elements stayed stubbornly high, and operation-and-maintenance costs kept climbing.

Selection Approach and Solution Matching

After multiple rounds of technical comparison and on-site testing, the manufacturer ultimately selected the Bonve cam-type twin rotor pump as the dedicated conveying equipment for polyurethane and resin materials, with the supporting configuration specified as a sanitary-grade rotor pump equipped with a mechanical seal and an added front-flush port. The core selection logic revolved around three points:

First, a low-shear conveying structure safeguards material quality. As the cam rotor pump runs, material is pushed gently and evenly through the pump chamber, flow velocity is uniform, and temperature rise is held to an extremely low level; resin pre-polymerization triggered by localized shear overheating is avoided, and all finished-product indicators remain stable.

Second, a simple pump-chamber design enables easy online cleaning. Unlike the complex, narrow flow channels of long screw pumps, the cam rotor pump has spacious internal flow paths with no dead-end residue zones; once production ends, simply circulating cleaning solution through completes CIP online flushing. Resin residue drops sharply, cutting off the material basis for shutdown solidification at the source.

Third, three-lobe rotors paired with a flushed mechanical seal. For high-viscosity media, large-displacement three-lobe rotors were selected; sufficient flow is achieved at low rotational speed, and the wear rate between rotors and chamber walls drops markedly. The mechanical seal was fitted with a front-flush port, so flush fluid continuously blocks resin particles from reaching the seal faces, fundamentally resolving particle-adhesion wear.

Post-Retrofit Operating Performance

After the equipment went into service, on-site performance validated the selection. Disassembly-and-overhaul labor hours dropped sharply; routine batch switches now require only an online flush, with no need to tear down the pump body each time to clear solidified resin. With the material temperature-rise problem eliminated, all test indicators of the finished resin stayed stable, and the previously occasional localized pre-polymerization defects disappeared. Seal service life lengthened noticeably, spare-parts procurement frequency fell, and operation-and-maintenance spending was compressed accordingly. Equipment start-stop cycles were smooth, pump-seizure faults were essentially eliminated, and the line's continuous-running capability improved.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

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Official Website: www.bvpumps.com  

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We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.