Effect of deaeration on processability of poorly flowing powders by roller compaction

Wang, Chenguang; Wang, Zijian; Friedrich, Albin; Sun, Changquan Calvin

doi:10.1016/j.ijpharm.2022.121803

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…where Kypc -is the pre-compaction coefficient of the material after leaving the screw feeder, at the entrance to the area of the material seizure by rollers; Kyroll -coefficient of material compaction by the press rollers, which is determined by the geometric parameters of the deformation area in the roller press [34,18]:…”

Section: Methods Of Model-based Design the Parameters Of The Roller P...mentioning

confidence: 99%

“…They can be equipped, subject to technological conditions, with different types of screws -cylindrical, conical, and complex, including as well as screws with a constant and variable pitch. Figure 1 presses is based on the experimental results [6,5,27,34,18,21].…”

Section: Introductionmentioning

confidence: 99%

“…In [34], the influence of vacuum on the process of roller compaction of powders with the extremely poor flow is examined. This influence for materials under consideration is qualitatively correlated with the sensitivity of their bulk densities to the pressure.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Approach to the Screw Feeder Design to Improve the Reliability of Briquetting Process in the Roller Press

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Eksploatacja i Niezawodność – Maintenance and Reliability

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The screw feeder design for the pre-compaction of bulk materials to be briquetted in a roll press is considered to increase the overall reliability. The relationship between the parameters of the screw feeder and its technological characteristics is investigated by the example of two fine-grained materials. A new mathematical model and design algorithm have been developed, which takes into account the properties of materials, the roller press parameters, the shape of the briquettes, and their deformation after compaction. The relationship between the pre-compaction pressure and the material stack height at the inlet is determined. The relations between the torque, the screw pitch, and the material stack height above the inlet, as well as the drive power and the screw pitch on productivity, are investigated. In experiments, using the proposed design, the compaction ratio of the peat increases by 22-27%, and hydrolyzed lignin – by 14-17%. The proposed approach allows for preventing drive overloading and ensures the reliable operation of pre-compaction devices for the roller presses.

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Section: Methods Of Model-based Design the Parameters Of The Roller P...mentioning

confidence: 99%