Coffee Roaster

8/12/2019 Coffee Roaster

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User Innovation: building your own coffee roaster


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There are other Vital Grills, eg. from Gourmet Maxx, but they don

tseem to be suitable for roasting coffee.

Any other chicken roasting oven will do it as well if you build a drum byyourself.


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Some industrial coffee roasting companies use the hot air roastingmethod: Hot-air roasters force heated air through a screen orperforated plate under the coffee beans with sufficient force to lift thebeans. Heat is transferred to the beans as they tumble and circulatewithin this fluidized bed.

There are two temperature thresholds called "cracks " that roasterslisten for. At about 205207 C, beans will emit a cracking sound. Thispoint is called "first crack" ! bean doubles in size, becomes a lightbrown color and experiences a weight loss of approximately 5%. Whenthe beans are at about 224227 C, the beans emit a "second crack."This is the dividing point between medium and dark roasts.

The degree of roast can be determined by the colour (Agtron scale),the bean

s inner temperature and the sounds during the process, thesmell and the taste.


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Capacity 20 kg, used for gourmet coffee with pleasantly good results.Problem, not everyone has such a gourmet coffee place around the

corner.


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The roasters shown on the pictures have a capacity of 1200-2000kg/h

http://www.diedrichroasters.comhttp://www.probatburns.com


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Rather freshly roasted coffee is much more aromatic than coffeeroasted 2 months ago

People have their personal gusto, some like it more bitter, some rathersour, roast like you want, create your own blendsPeople can roast portions of the size depending on their consumptionDepending on the intensity of roasting, the coffee tastes rather sour orrather bitter. For light roasting, it

s rather sour, but less bitter. Anintense roast tastes a little sweet but also more bitter.


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The Vital Grill comes with a drum for french fries. Fill the wholes on thesides of the drum so that beans don't fall out.


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You also need to get rid of a security feature : Bypass the overheatprotection function with a bridge. That brings you to the dangerous side. Now the Grill doesn't turn off every time it gets a bit hot. Like thisthe roasting process will not be interrupted.


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The PID serves to control heating in a way to get a stable temperature.PID: proportionalintegralderivative controller


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Italian engines for Italian coffee


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The electronic parts can be bought at stores, eg. Conrad, or at

specialised internet shops.There are endless threads on the topic that can be found in relevantforums

www.kaffee-netz.dewww.coffeeforums.comwww.coffeegeeks.com


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The manufacturers of home roasters can profit from economies ofscope e.g. when they produce other similar home use products like

ovens


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However, some companies advertize their products for dual use An unmodified chicken grill is advertized as a coffee roaster

(Chinese company) An popcorn popper is advertized as a coffee roaster or vice versa


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Chaff collection: Separates coffee bean peels and gases exhausted

during roasting from the beans

www.genecafe.com

Other coffee roasting machines for using at home:

Alpenrst

von Swissmar, not produced anymore since 1999Behmor 1600, www.behmor.comHottop, www.hottopusa.com


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Relation to lecture (educated guess as it

s only our 2 nd lecture)

Drivers:dissatisfaction : strive for better coffee. (Custom needs lead tocustom products).market deficiencies : (market failures might be too strong for ourcase). There

s no or only small market. Small market segment (mightchange), no economies of scale resulting in rather expensive devicesexperimentation at two levels (a) development and(b) application of device: new coffee bean mixtures, roasting flavorsetc.Enablers:exchange media : fostering diffusion of ideas and innovation -technology (digital photography, blogs, forums), collective endeavorCulture: or context in which the innovation takes place. Not only

coffee culture

but also collaboration and competition culture (code ofconduct), exploration/experimentation culture, create a public good etc.Risks:The legal liability as opposed to a manufacturer, who has to complywith security standards and the like.


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Lead user (as seen by Eric Hippel): users ahead of the majority ofusers in their populations in respect to an important market trend, and

they expect to gain relatively high benefits from a solution to the needsthey have encountered there . (see page 4 of democratizing innovation)

Chicken egg problem: roasting process well known as well astechnique/technology. Users don

t innovate the process nor do theychange the underlying technique (technology). Innovation takes placeat the

miniaturization

dimension and the novel usage of existing orincrementally enhanced devices and tools.

Miniaturization: : e.g. downsizing from 300kg roasting capacity to 300g,thus a hardware innovation if using the terms of

P. Faulkner and J.

Runde

(see lecture papers).

Why we argue a line has to be drawn to identify lead user: We assumecoffee has first been consumed in Ethiopia, where it is still nowadaysroasted in pans over open fire.


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Interpretive Flexibility (Wikipedia): The concept belongs to the Socialconstruction of technology , which argues that technology does not

determine human action, but that rather , human action shapestechnology . It also argues that the ways a technology is used cannotbe understood without understanding how that technology isembedded in its social contextInterpretative Flexibility means that each technological artifact hasdifferent meanings and interpretations for various groups. The mostbasic relevant groups are the users and the producers of thetechnological artifact. The groups can be distinguished based on theirshared or diverging interpretations of the technology in question. Justas technologies have different meanings in different social groups,there are always multiple ways of constructing technologies. Thedifferent interpretations often give rise to conflicts between criteria thatare hard to resolve technologically . Different groups in differentsocieties construct different problems, leading to different designs.Interpretive flexibility refers to the way that the same artifact can meandifferent things to different social groups. This flexibility is linked to theway that different social groups frame technology and it hasimplications for its adoption and further development.


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Feuer und Flame fuer/vom Kaffeeroester


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The electronic parts can be bought at stores,

eg. Conrad, or at specialised internet shops.There are endless threads on the topic that canbe found in relevant forums

www.kaffee-netz.dewww.coffeeforums.comwww.coffeegeeks.com


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Coffee Roaster

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