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Thread: Isomac Zaffiro Preinfusion

  1. #1
    Member
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    Sep 2005
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    Isomac Zaffiro Preinfusion

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Can someone help me out with preinfusion.. nothing in the book (yes I read the instructions) to indicate what its used for.. forgive my ignorance..

    Cheers,
    paulie338

  2. #2
    Caffeine Junky
    Join Date
    May 2009
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    Re: Isomac Zaffiro Preinfusion

    Pre-infusion is simply a wetting of the coffee grounds before extraction begins. *Others will probably be able to give a better explanation as to how this improves the end result.

    This is one of the features of the E61 group.

  3. #3
    Mal Dimal's Avatar
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    Warwick, QLD
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    Re: Isomac Zaffiro Preinfusion

    Basically,

    Pre-infusion is a process that introduces brew water under low(er) pressure (about 4-5 BAR) for a few seconds, to ensure that the coffee puck is properly saturated and allowed to expand up against the shower-screen before full brew water pressure is applied.

    The object of doing this is to try and create a homogeneous cake of coffee that presents an even overall resistance to the water flow when under brew pressure, so as to reduce as much as is practical, the tendency for channelling or fracturing of the coffee cake to occur.

    Manual E-61 Groups achieve this via a set of valves controlled by spring compression contained within the Brew Head. Other designs achieve a similar end result by a combination of switching valves via electronic means, in and out of circuit with preset Pressure Bypass Valves. No matter which method is used, the aim is the same.... Prevent channelling and fracturing of the coffee puck.... 8-)

    Mal.

  4. #4
    Member
    Join Date
    Sep 2005
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    Re: Isomac Zaffiro Preinfusion

    Thanks Caffeine Junky and Mal.. perfect explanation. Will experiment with it..

    ;D



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