Breakage parameters of some materials in smooth roll crushers

Austin, L.G.; Orden, D. van; McWilliams, Brandon; Perez, J.W.; Shoji, K.

doi:10.1016/0032-5910(81)87050-7

Cited by 24 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several studies on roller milling have demonstrated the effect of roll gap on the particle size of the milled grains and various breakage functions or models [44][45][46][47][48] have been developed for the prediction of the particle size distribution of milled gains. Generally the reduction of the roll gap has as a result the production of smaller particle sizes in the output stream.…”

Section: Effect Of Roll Gap On Starch Hydrolysismentioning

confidence: 99%

The effect of milling parameters on starch hydrolysis of milled malt in the brewing process

Mousia¹,

Balkin²,

Pandiella³

et al. 2004

Process Biochemistry

View full text Add to dashboard Cite

Section: Effect Of Roll Gap On Starch Hydrolysismentioning

confidence: 99%

The effect of milling parameters on starch hydrolysis of milled malt in the brewing process

Mousia¹,

Balkin²,

Pandiella³

et al. 2004

Process Biochemistry

View full text Add to dashboard Cite

“…Milling Using Smooth Rolls Previous work (Austin et al 1980(Austin et al , 1981Haque 1991) studied the situation of a particle being drawn into the nip of smooth rolls counter-rotating at the same speed. In these studies, the particle was assumed to be spherical, as shown in Fig.…”

Section: Stress and Strain Analysis Of A Wheat Kernel Between Two Rollsmentioning

confidence: 99%

Stress‐Strain Analysis and Visual Observation of Wheat Kernel Breakage During Roller Milling Using Fluted Rolls

Chen¹,

Campbell

2002

Cereal Chem

View full text Add to dashboard Cite

The endosperm and bran of a wheat grain have different mechanical properties and break differently under the same stresses. Stress‐strain analysis was used to model the factors affecting wheat kernel breakage during milling using fluted rolls. The planes of principal compressive and tensile stress and the maximum shear stresses, along which the kernel is most likely to be broken, were calculated for a sharp‐to‐sharp roll disposition. With the occurrence of compressive stress in the horizontal direction and shear stress in the vertical direction, a kernel tends to break along a principal tensile stress plane because the tensile strength of the endosperm is much smaller than its compressive strength. The model presented quantifies the mathematical relationship of three design and operational factors affecting the principal stresses and the maximum shear stresses: roll gap, differential, and roll diameter. High‐speed video was used to observe wheat breakage events during milling; the results show consistency with the theoretical analysis.

show abstract

On Predicting Roller Milling Performance IV: Effect of Roll Disposition on the Particle Size Distribution from First Break Milling of Wheat

Chen¹,

Campbell²

2003

Journal of Cereal Science

View full text Add to dashboard Cite

The breakage equation for roller milling allows prediction of the output particle size distribution from the feed particle size distribution in terms of a breakage function. Breakage functions were determined for First Break milling of hard and soft wheats under four roll dispositions: Sharp-to-Sharp (S-S), Sharp-to-Dull (S-D), Dull-to-Sharp (D-S) and Dull-to-Dull (D-D). The breakage functions were then used to predict the particle size distribution resulting from milling whole wheat samples at different roll gaps, for comparison with experimental results. First Break milling of both hard and soft wheat samples under a S-S disposition gave an even distribution of particle sizes over the range 250±2000 mm, which could be described by linear breakage functions. The effect of changing roll gap was to change the slope of the line i.e. to change the balance between small and large particles, with larger roll gaps giving a greater proportion of large panicles. Milling under S-D, D-S and D-D dispositions gave progressively more`Ushaped' distributions; these were described by quadratic functions that indicated large quantities of small and large particles, but fewer in the middle size range. Again, increasing roll gap changed the balance towards more large particles, but had little effect on the quantity of particles in the middle size range. Predictions of output cumulative particle size distributions using the breakage equation gave excellent agreement with independently derived experimental results, with R 2 in excess of 0Á99 in all cases. The trend in wheat quality testing is to measure distributions of single kernel parameters. The breakage equation approach allows the link to be made between distributions of single kernel parameters and milling performance.

show abstract

Breakage parameters of some materials in smooth roll crushers

Cited by 24 publications

References 4 publications

The effect of milling parameters on starch hydrolysis of milled malt in the brewing process

The effect of milling parameters on starch hydrolysis of milled malt in the brewing process

Stress‐Strain Analysis and Visual Observation of Wheat Kernel Breakage During Roller Milling Using Fluted Rolls

On Predicting Roller Milling Performance IV: Effect of Roll Disposition on the Particle Size Distribution from First Break Milling of Wheat

Contact Info

Product

Resources

About