Correlation of Roll Mill Variables

Maus, L.D.; Walker, William C.; Zettlemoyer, A. C.

doi:10.1021/ie50544a019

Cited by 6 publications

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“…In the present case of the roll mill, the deviation in the exponent may be caused by the complicated behavior of the free surfaces existing at the bank and the film splitting region as shown in Figure 2. Maus et al (1955) proposed the empirical equation of the power in a two-roll mill. The end plates were not used in their experiment for the apron nip and their equation for the apron nip can be compared with the present data.…”

Section: Resultsmentioning

confidence: 99%

“…The power consumption in a roll mill has only been previously measured by Maus et al (1955). Their experimental result was rewritten by Patton (1964) to a simpler form.…”

mentioning

confidence: 99%

“…The symmetric flow of the fully immersed roller pair in a viscous fluid was studied by Banks and Mill (1954) and other workers. But the flow in a roll mill and roll coater has a nonsymmetric pressure profile as pointed out by Myers andHoffman (1961) andSchneider (1962), and the fully immersed condition cannot be used for actual flow. Recently, Greener and Middleman (1979) thickness in an equal roll speed system by applying the simple model of the film splitting region.…”

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confidence: 99%

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Power consumption in a two-roll mill

Murakámi¹,

Hirose²,

Chung³

et al. 1985

Ind. Eng. Chem. Proc. Des. Dev.

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A solution to the power consumption in a two-roll mill rotating at unequal speeds was derived based on the lubrication model analysis coupled with the boundary condition of the nonsymmetric pressure and compared with the measurement for Newtonian fluids. The experiment was carried out with the three pairs of rolls of diameter D = 8.8, 11.3, and 16.4 cm in the range of the minimum nip clearance H , = 40-610 pm, roll speed ratio Nr = 1-7.6, and fluid viscosity p = 2-1 1 Pa s. The theoretical dependence of the power on the bank width agrees well with the experimental dependence. The experimental resuits for the total power consumption and the contribution of the individual roll to it are well correlated by the dimensionless variables derived from the analysis. However, the value of the exponent of the Reynolds number is 10% smaller than the value of -1 which is expected in the theory.Roll mills are widely used in industrial dispersing processes of highly viscous suspensions, such as paints, printing inks, cosmetics, and metal pastes for microcircuits. The suspension is forced to pass through the very close clearance formed by a pair of rolls rotating at different speeds, where the shear rate in the nip amounts to an order of 103-105 s-l. Due to high shear stresses exerted on the suspension, good dispersion of the highly viscous suspension can be expected to the extent which cannot be obtained in other conventional mixers. Examples of a three-roll mill and a two-roll mill which are usually used in the dispersing industry are shown in Figure 1.The power requirement is an important variable in the design and operation of a roll mill, but it is difficult to determine exactly since the power is consumed not only by fluid motion in the nips but also at the end plates and the scraper. In order to determine the net power consumed by fluid motion in the nips, it should be accurately separated from a gross power measured in a roll mill system.

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Section: Resultsmentioning

confidence: 99%

“…The power consumption in a roll mill has only been previously measured by Maus et al (1955). Their experimental result was rewritten by Patton (1964) to a simpler form.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Power consumption in a two-roll mill

Murakámi¹,

Hirose²,

Chung³

et al. 1985

Ind. Eng. Chem. Proc. Des. Dev.

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“…THE first paper (2) published here a method of correlation for roll mills was presented, and in the second (3) an improved and simplified three roll mill-the floating roll mill-was described.…”

Section: Inmentioning

confidence: 99%

“…Furthermore, the training of new laboratory personnel in the proper operation of a mill is no longer a major problem. Floating roll mills have been used in this laboratory for over 2 years, and a four-point mill would no longer be considered.…”

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confidence: 99%

Correlation of Floating Roll Mill Variables

Zettlemoyer¹,

Taylor²,

Maus³

1955

Ind. Eng. Chem.

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Die Feinzerkleinerung von Schokolademasse

Ruisinger

Heiss

Sybel

1961

Chemie Ingenieur Technik

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Schokolademassen werden während des Fabrikationsprozesses hauptsächlich in Walzwerken zerkleinert. Zur theoretischen Untersuchung des Walzproblems wurden ein hydrodynamischer und ein statischer Ansatz für die Vorgänge im Walzenspalt herangezogen. Auf einem Versuchswalzenstuhl wurden Durchsatz und Zerkleinerungsfortschritt unter den verschiedensten Bedingungen gemessen. Es ergab sich, daß sich der Vorgang beim Walzen von Schokolademasse nicht eindeutig mit den theoretisch abgeleiteten Gleichungen beschreiben läßt. Es wurde daher versucht, bestehende Zusammenhänge durch Kenngrößengleichungen anzugeben, die mit Hilfe der im Versuchswalzenstuhl erarbeiteten Ergebnisse aufgestellt werden konnten. Diese Gesetzmäßigkeiten ermöglichen eine Abschätzung der Auswirkung von Änderungen der Betriebsbedingungen und der geometrischen Abmessungen auf die interessierenden Größen des Durchsatzes und des Zerkleinerungsfortschrittes.

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Correlation of Roll Mill Variables

Cited by 6 publications

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Power consumption in a two-roll mill

Power consumption in a two-roll mill

Correlation of Floating Roll Mill Variables

Die Feinzerkleinerung von Schokolademasse

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