Draining
OIV: Operation consisting of leaving the juice of the crushed, harvested grapes to flow, before pressing.
Objective: To obtain a must including little of the substances contained in the stalks, skins, seeds, etc.
Prescriptions:
There are two distinct draining techniques: static and dynamic:
- The first should be as rapid as possible,
- The second should avoid abrasion which produces musts with a high solids content.
In winemaking, **draining** is a primary solid–liquid separation operation performed immediately after or during maceration. It is a gentle, gravity-based process that allows the free-run fraction of must or wine to separate naturally from grape solids without the application of external pressure. Draining plays a decisive role in shaping wine style, phenolic balance, aromatic purity, and textural finesse, particularly in red and skin-contact white vinification.
Draining (Free Run) is the oenological operation by which the liquid phase of crushed, macerated, or fermenting grapes is separated from the solid phase solely by gravitational flow, without mechanical pressing, yielding **free-run must or free-run wine**.
The drained liquid originates from the interstitial spaces within the grape solids and is characterized by lower turbidity, reduced extraction of phenolic compounds, potassium, and harsh tannins compared to press fractions. Draining is typically performed at the end of maceration, during fermentation (rack-and-return systems), or prior to pressing, and constitutes a distinct fraction that may be vinified separately or blended according to stylistic and quality objectives.
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If you’d like, I can also provide:
* A **formal comparison table**: draining vs pressing vs racking
* A **process-stage classification** for your wine production database
* A **sensory and chemical profile** of free-run vs press fractions
Just tell me how deep you want to go.
Draining
OIV: Operation consisting of leaving the juice of the crushed, harvested grapes to flow, before pressing.
Objective: To obtain a must including little of the substances contained in the stalks, skins, seeds, etc.
Prescriptions:
There are two distinct draining techniques: static and dynamic:
- The first should be as rapid as possible,
- The second should avoid abrasion which produces musts with a high solids content.
In winemaking, **draining** is a primary solid–liquid separation operation performed immediately after or during maceration. It is a gentle, gravity-based process that allows the free-run fraction of must or wine to separate naturally from grape solids without the application of external pressure. Draining plays a decisive role in shaping wine style, phenolic balance, aromatic purity, and textural finesse, particularly in red and skin-contact white vinification.
Draining (Free Run) is the oenological operation by which the liquid phase of crushed, macerated, or fermenting grapes is separated from the solid phase solely by gravitational flow, without mechanical pressing, yielding **free-run must or free-run wine**.
The drained liquid originates from the interstitial spaces within the grape solids and is characterized by lower turbidity, reduced extraction of phenolic compounds, potassium, and harsh tannins compared to press fractions. Draining is typically performed at the end of maceration, during fermentation (rack-and-return systems), or prior to pressing, and constitutes a distinct fraction that may be vinified separately or blended according to stylistic and quality objectives.
---
If you’d like, I can also provide:
* A **formal comparison table**: draining vs pressing vs racking
* A **process-stage classification** for your wine production database
* A **sensory and chemical profile** of free-run vs press fractions
Just tell me how deep you want to go.
