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Utveckling av mjukglassomrörare: En studie för ökad luftinblandning
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2010 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Development of Beater for Soft Ice Cream : A Study for Increased Air Ratio (English)
Abstract [sv]

Den här rapporten är ämnad som underlag till ett fortsatt utvecklingsarbete av en omrörare för mjukglassmaskiner. I en mjukglassmaskin kyls glassen under kontinuerlig omrörning, på så vis blandas luft in och ger glassen fluffighet. Omrörarens huvudfunktioner är luftinblandning, avskrapning av iskristaller längs innerhöljet av kylcylindern samt utmatning av mjukglass mot öppningsdörr. Med en ny utformning ska omröraren bidra till en mer kostnadseffektiv mjukglass-maskin samt ge en godare glass, eftersom en luftigare konsistens med mindre iskristaller generellt smakar bättre. Oceanpower Co Ltd tillverkar mjukglassmaskiner, och den omrörare vilken de idag använder sig av har tjänat som utgångspunkt. Omröraren består av en stålaxel med ett skruvliknande hölje i plast. Genom intervjuer, litteraturstudier och övrig efterforskning har arbetet lett fram till en modell som bygger på principen Kenics static mixer. Eftersom det förmodas vara laminär strömning i kylcylindern, i vilken omröraren roterar, borde luft kunna vikas in i glassmassan likt degknådning. Den modell som framkommit ur det här förarbetet består av samma stålaxel som föregångaren men höljet har istället vridna blad ställda vinkelrätt varandra. Vid varje övergång till nästa blad, särdelas massan och det medför en naturlig blandning samt en ökad lufthalt i glassen. Eftersom den föreslagna modellen är likartad den befintliga omröraren, kan samma tillverkningsmetod användas. Det framgick dock att, beroende på lasterna vid omrörning, kan det vara möjligt att minska tillverkningskostnaden genom att byta material på omröraren. Vid eventuell vidareutveckling av konceptet, bör datorsimuleringar och fysiska tester göras. Med en avsaknad av tester, baserades det framlagda förslaget på teoretiska metoder.

Abstract [en]

This report is aimed as a preparatory study to a continued development of a beater for soft serve ice cream machines. In a soft serve ice cream machine the ice cream is cooled while continuously stirred. The interference of air into the ice cream batter is being made during this procedure, making it fluffier. The main purpose of the beater is to mix in air bubbles, to scrape off ice crystals from the inner casing of the cooling cylinder and to press out the soft ice cream against the opening door. A new design of the beater shall contribute to a more cost efficient soft serve ice cream machine. It shall also generate a better tasting ice cream, due to a lighter consistency with smaller ice crystals. Oceanpower Co Ltd manufactures soft serve ice cream machines. Their original beater which the new version is developed from is made of a steel shaft with a plastic cover, designed like a screw. Through interviews, literature studies and other research, the analysis has resulted in a model which is based on the principle of Kenics static mixer. Since it is believed to be a laminar flow in the cooling cylinder where the beater is placed, it should be possible to fold in air into the cream like when working dough in baking. The model that this preparatory research has resulted in is composed of the same steel shaft as the precursor. The plastic casing has twisted blades perpendicular to each other. With every transition to the next blade, the ice cream is cut in half which cause a natural mixing. Since the proposed model is fundamentally equivalent to the forerunner, the same manufacturing process can be used. However, it appeared that depending on the loads of agitation, it may enable a reduction in manufacturing costs by changing the materials of the beater. In a further development of the concept, computer aided simulations and tests should be made. With an absence of testing, the presented proposal is based on theoretical methods.

Place, publisher, year, edition, pages
2010.
Series
MMKB 2010:03 IDEB 023
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172077OAI: oai:DiVA.org:kth-172077DiVA: diva2:845591
Available from: 2015-10-19 Created: 2015-08-12 Last updated: 2015-10-19Bibliographically approved

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