Question:
Here in Oz they’re often called heading-down boards, and have been in use for over a hundred years, and were probably copied from the French. You still need to pump over, and you can’t punch down (the mesh gets in the way!), but what it does do is to ensure all the cap is submerged, and that the top doesn’t dry out and go acetic. They can be a bit of a pain in the neck, as they limit options for breaking up the cap, but they are there all the time, thus maximising contact. Best used for Shiraz and other rich wines which get plenty of natural tannin extraction, as opposed to lighter varieties where a more vigorous extraction may be desired. Cheers, Andrew _______ This message is to be read as an attempt to provide information. Where possible I have attempted to indicate where this information came from. Any errors etc are mine, but I will ignore nitpicking and outbursts of LIVID ANTAGONISM in a similar manner to Gloria!
Interesting point (skin contact). This past fall I had my skin cap start to spill over the sides of my fermenter (on one batch) and it made me wonder if anyone has tried using something like a stainless steel mesh to hold the cap down in the liquid during fermentation. Seems to me that it would greatly assist in extraction. Anyone??? Richard
– Hide quoted text — Show quoted text – Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
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The other consideration is the circulation within the tank. Fermentation is hardly static. With the CO2 being liberated there is a lot of movement within the vessel. On a large scale it does make a difference. I suspect that at the 5 gallon scale it is less important. Much research has been done on the beer side of fermentation regarding this question, check out the MBAA journal. Sounds like there has been at least some on the wine side too. -J – Hide quoted text — Show quoted text – Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
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Interesting point (skin contact). This past fall I had my skin cap start to spill over the sides of my fermenter (on one batch) and it made me wonder if anyone has tried using something like a stainless steel mesh to hold the cap down in the liquid during fermentation. Seems to me that it would greatly assist in extraction. Anyone??? Richard – Hide quoted text — Show quoted text – Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
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Paul — Any idea what the mechanism would be for a short wide container wielding better extraction? I don’t see how that would increase juice contact. Maybe something else that didn’t come to mind.
Don’t really know. I just quoted an article I read. I guess it would have something to do with spreading the same surface of the skins over a larger surface area of the liquid beneath. I have not really thought it through thoroughly for myself to see if it makes sense. As far as a screen to hold the skins down, I had though of using a cutting down a plastic bucket lid and drilling a lot of 1/2 in. holes then weighting it down some way to hold the skins down. It would be easy to take it out and stir and put it back. I only plane on trying it if I get a larger primary. I don’t want to play with it for the 6 primaries all at once I was using this year.
At the commercial winery where I work part time, we suck the seeds off the bottom of the primary with a pump after the fermentation is well on its way and pass the juice (wine) over a screen and and over the skins. The seeds are then discarded. I have not figured out a way to do this on a home wine making scale as yet. – Hide quoted text — Show quoted text – Ray Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
Response:
Paul — Any idea what the mechanism would be for a short wide container wielding better extraction? I don’t see how that would increase juice contact. Maybe something else that didn’t come to mind. As far as a screen to hold the skins down, I had though of using a cutting down a plastic bucket lid and drilling a lot of 1/2 in. holes then weighting it down some way to hold the skins down. It would be easy to take it out and stir and put it back. I only plane on trying it if I get a larger primary. I don’t want to play with it for the 6 primaries all at once I was using this year. Ray
– Hide quoted text — Show quoted text – Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
Response:
Interesting point (skin contact). This past fall I had my skin cap start to spill over the sides of my fermenter (on one batch) and it made me wonder if anyone has tried using something like a stainless steel mesh to hold the cap down in the liquid during fermentation. Seems to me that it would greatly assist in extraction. Anyone??? Richard
Contact is one thing, but extraction also occurs through the "action" of punching down or pumping over, in that the skins are stirred and broken up a bit helping to release their goodies. Also, punching down or pumping over provides the much needed oxygen for red fermentations. There are a handful of systems becoming available for large scale red fermentation. The newest style has a cone-like device midway up the tank that traps some CO2 as it’s produced. Periodically a large bubble of CO2 gets released and that action stirs the cap. I cannot see any advantage in these or a screen as you’ve described, for smaller batches. I personally rather enjoy punching down my reds, so options like yours seem a bit bass ackwards to me. clyde
Response:
Interesting point (skin contact). This past fall I had my skin cap start to spill over the sides of my fermenter (on one batch) and it made me wonder if anyone has tried using something like a stainless steel mesh to hold the cap down in the liquid during fermentation. Seems to me that it would greatly assist in extraction. Anyone??? Richard
That seems to make a lot of sense to me and I have wondered how to design such a mesh.
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Has anyone tried to experiment with different shapes of fermentation vessels? Say that you use something very wide but short, or very narrow but tall vs. the traditional cyclindrical shape? Also, what about the angle? Would this have any affect on the fermentation time/taste?
Response:
Has anyone tried to experiment with different shapes of fermentation vessels? Say that you use something very wide but short, or very narrow but tall vs. the traditional cyclindrical shape? Also, what about the angle? Would this have any affect on the fermentation time/taste?
I’ve often wondered the same thing. For instance would a open top container that is roughly 3′x2′ ferment 5 gallons different than a regular bucket? Would the additional surface area of the wine make the must ferment faster, or would it allow the c02 to dissipate more quickly and cause oxidation when Thanks for bringing this up. Nick
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Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left behind when racking. So a plumbob shaped container like the V shaped container mentioned in recent threads would be best. But that means slopping sides and you will have to shake it slightly and frequently to get the lees to go to the bottom instead of clinging to the sloping sides. That brings us back to a cylinder with straight sides but one that is tall with a small bottom. Should be best. So you can go out and find one or hire a glass blower to make one for you. Then again you can use regular glass carboys which is cheaper and readily available. :O) Ray
– Hide quoted text — Show quoted text – Has anyone tried to experiment with different shapes of fermentation vessels? Say that you use something very wide but short, or very narrow but tall vs. the traditional cyclindrical shape? Also, what about the angle? Would this have any affect on the fermentation time/taste? I’ve often wondered the same thing. For instance would a open top container that is roughly 3′x2′ ferment 5 gallons different than a regular bucket? Would the additional surface area of the wine make the must ferment faster, or would it allow the c02 to dissipate more quickly and cause oxidation when Thanks for bringing this up. Nick
Response:
Once the fermentation slows down and you are trying to protect it from air, it only stands to reason that a large surface area at the top will be at greater risk. However I consider the shape more important in terms of lees The larger the area of the lees compared to the volume, the more that will have to be left
From Wine Business Monthly, September 2002, page 28: "Fermentation Vessels Fermentation vessel size can greatly afect the rate of extraction. A shorter wider tank can increase the amount of skins that are incontact with the juice and be more efficient at extracting tannins and flavor. Gavin Berry at Plantagenet in Western Australia prefers a short squat vessel for most of his reds. Traditional laares in Portugal’s Douro Valley were always low in order to extract lots of color and fruit. ……"
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