Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying

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dc.contributor.advisor Byrne, Edmond P.
dc.contributor.author Pathare, Pankaj B.
dc.date.accessioned 2011-08-31T11:34:00Z
dc.date.available 2011-08-31T11:34:00Z
dc.date.issued 2010-07
dc.date.submitted 2010-10-07
dc.identifier.citation Pathare, P.B., 2010. Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying. PhD Thesis, University College Cork. en
dc.identifier.uri http://hdl.handle.net/10468/397
dc.description.abstract This study has considered the optimisation of granola breakfast cereal manufacturing processes by wet granulation and pneumatic conveying. Granola is an aggregated food product used as a breakfast cereal and in cereal bars. Processing of granola involves mixing the dry ingredients (typically oats, nuts, etc.) followed by the addition of a binder which can contain honey, water and/or oil. In this work, the design and operation of two parallel wet granulation processes to produce aggregate granola products were incorporated: a) a high shear mixing granulation process followed by drying/toasting in an oven. b) a continuous fluidised bed followed by drying/toasting in an oven. In high shear granulation the influence of process parameters on key granule aggregate quality attributes such as granule size distribution and textural properties of granola were investigated. The experimental results show that the impeller rotational speed is the single most important process parameter which influences granola physical and textural properties. After that binder addition rate and wet massing time also show significant impacts on granule properties. Increasing the impeller speed and wet massing time increases the median granule size while also presenting a positive correlation with density. The combination of high impeller speed and low binder addition rate resulted in granules with the highest levels of hardness and crispness. In the fluidised bed granulation process the effect of nozzle air pressure and binder spray rate on key aggregate quality attributes were studied. The experimental results show that a decrease in nozzle air pressure leads to larger in mean granule size. The combination of lowest nozzle air pressure and lowest binder spray rate results in granules with the highest levels of hardness and crispness. Overall, the high shear granulation process led to larger, denser, less porous and stronger (less likely to break) aggregates than the fluidised bed process. The study also examined the particle breakage of granola during pneumatic conveying produced by both the high shear granulation and the fluidised bed granulation process. Products were pneumatically conveyed in a purpose built conveying rig designed to mimic product conveying and packaging. Three different conveying rig configurations were employed; a straight pipe, a rig consisting two 45° bends and one with 90° bend. Particle breakage increases with applied pressure drop, and a 90° bend pipe results in more attrition for all conveying velocities relative to other pipe geometry. Additionally for the granules produced in the high shear granulator; those produced at the highest impeller speed, while being the largest also have the lowest levels of proportional breakage while smaller granules produced at the lowest impeller speed have the highest levels of breakage. This effect clearly shows the importance of shear history (during granule production) on breakage during subsequent processing. In terms of the fluidised bed granulation, there was no single operating parameter that was deemed to have a significant effect on breakage during subsequent conveying. Finally, a simple power law breakage model based on process input parameters was developed for both manufacturing processes. It was found suitable for predicting the breakage of granola breakfast cereal at various applied air velocities using a number of pipe configurations, taking into account shear histories. en
dc.description.sponsorship Department of Agriculture, Fisheries and Food, Ireland (FIRM) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.relation.uri http://library.ucc.ie/record=b2027070~S0
dc.rights © 2010, Pankaj B. Pathare en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Granola breakfast cereal en
dc.subject High shear granulation en
dc.subject Fluidised bed granulation en
dc.subject Texture properties en
dc.subject Pneumatic conveying en
dc.subject.lcsh Cereal products en
dc.subject.lcsh Granulation en
dc.subject.lcsh Food texture en
dc.subject.lcsh Food processing machinery en
dc.subject.lcsh Pneumatic-tube transportation en
dc.title Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Process & Chemical Engineering) en
dc.internal.availability Full text available en
dc.description.version Accepted Version en
dc.contributor.funder Department of Agriculture, Fisheries and Food, Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Process and Chemical Engineering en


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© 2010, Pankaj B. Pathare Except where otherwise noted, this item's license is described as © 2010, Pankaj B. Pathare
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