Double roller press granulators, as core equipment in fertilizer production lines, are widely used due to their high efficiency and energy saving. However, roller sticking has always been a problem for enterprises, not only reducing production efficiency and wasting raw materials, but also accelerating equipment wear and increasing maintenance costs. In-depth analysis of the causes of roller sticking and taking targeted solutions are key to ensuring stable equipment operation and improving product quality.
The core cause of roller sticking is an imbalance in three major factors: materials, equipment, and processes. Regarding materials, uncontrolled moisture content is the primary cause. The ideal moisture content for most materials is 8%-15%. Too high a moisture content will cause a surge in material viscosity, leading to adhesion to the roller surface and the formation of a film. Too low a moisture content will easily cause fine powder to accumulate and stick to the rollers. At the same time, a high proportion of fine powder, excessive fiber content, or pH imbalance in the material will also exacerbate the roller sticking problem. At the equipment level, improper roller surface roughness, severe wear, or unreasonable roller spacing can lead to uneven material force and difficulty in smooth material removal. In terms of process, fluctuations in extrusion pressure and mismatches between feed and rotation speed can lead to excessive material compression or accumulation, creating a vicious cycle of "the stickier, the more accumulated."
Solving the roller sticking problem requires adhering to the principles of "source control, hardware optimization, and meticulous operation," implementing rectification step by step. First, optimize material pretreatment to reduce stickiness at the source. Use an online moisture meter to control the moisture content in real time; if too high, add inert fillers such as fly ash or talc to dilute; if too low, spray humidification. Screen materials to ensure the proportion of fine powder does not exceed 30%, and fibrous materials require pretreatment; if necessary, add an appropriate amount of starch-based anti-sticking agent to reduce the risk of adhesion.
Second, strengthen equipment maintenance and optimization to solidify the anti-sticking foundation. Regularly polish and repair the rollers to control surface roughness within a reasonable range; further reduce adhesion by spraying a polytetrafluoroethylene (PTFE) anti-sticking coating. Precisely adjust the roller spacing, finely adjusting according to the target particle size to avoid excessive compression or poor feeding. Install flexible scrapers to clean the roller surface in real time, and clean with a special cleaning agent after each day's production to prevent material residue from solidifying.
Finally, precise control of process parameters ensures stable operation. A variable frequency control system stabilizes the extrusion pressure, preventing excessive fluctuations; the feed rate is synchronized with the roller speed to avoid sudden increases or decreases in feed rate; and when ambient humidity is high, the roller surface heating system is activated to control the temperature at around 50℃, reducing material adhesion.
Furthermore, a routine maintenance mechanism is established, including regular inspection of the roller surface morphology and cleaning of the equipment interior. Customized process parameters are developed for different materials, effectively preventing the recurrence of roller sticking problems. By accurately controlling the three core aspects of materials, equipment, and process, the roller sticking problem can be completely solved, allowing the double roller press granulator to achieve optimal performance and providing a guarantee for enterprises to reduce costs and increase production capacity.
