CENTRE COUNTY — Typically, a bottle of wine closed with a cork is often looked at as superior to those closed with a screw cap. However, the closure in and of itself is not always an accurate indicator of the quality of the wine in the bottle. Instead, the choice of closure that the winemaker selects can indicate the style of wine within the bottle.
WHY WINEMAKERS USE CORK
Cork stoppers are harvested from the bark of cork oak trees. These closures have been used in winemaking for hundreds of years.
One of the primary benefits of using a cork instead of a screw cap is the cork’s permeability. Using a cork allows tiny amounts of oxygen to enter the bottle over time. This slow oxygen exchange can help certain wines, especially complex reds and some whites, evolve over time in the bottle, developing what are called “tertiary” characteristics — aromas and flavors that come with age, like hints of dried fruit, earthiness, leather or spice — and softening tannins over time.
That said, cork is not a universal sign of quality.
While it’s ideal for wines that are built to age and transform over time, it’s not necessarily the best choice for every wine. Many wines are crafted to be enjoyed within a few years of release, when their fruit-forward freshness is at its peak. For these styles, a cork’s oxygen exchange can actually accelerate aging in an undesirable way.
To help mitigate this, some producers opt for synthetic corks that mimic the structure of natural cork while offering more control over oxygen transfer. Others turn to screw caps, which create a near-perfect seal and keep oxygen out almost entirely.
WHY SCREW CAPS AREN’T A SIGN OF QUALITY
While screw caps were once considered markers of cheap or low-quality wine, in recent years, they have steadily gained respect in the industry. The airtight seal screw caps provide make them particularly effective at preserving the freshness and vibrancy of wines that are intended to be consumed young. By minimizing oxygen exposure, screw caps help lock in fruit-forward aromas, bright acidity and clean, crisp flavors that might otherwise fade prematurely under a cork.
This makes screw caps especially popular among producers of aromatic white wines like sauvignon blanc, riesling and pinot grigio, as well as light reds such as gamay or unoaked pinot noir.
In regions like New Zealand and Australia, screw caps have become the standard, even for premium bottles, because of their ability to offer consistency and reduce spoilage from cork taint — a musty, moldy flaw caused by the compound TCA that can affect natural cork.
Ultimately, screw caps can provide winemakers more stability in their end product by giving them greater control over how their wines evolve in bottle.
MISCONCEPTIONS UNCORKED
There’s still a lingering belief that cork is inherently better, or that screw caps are reserved for cheap, mass-produced wine. In reality, both closures have their place depending on the style of wine and how it’s intended to be enjoyed.
The most important thing to remember is that the closure is just one part of the story. A screw cap doesn’t mean low quality, and a cork doesn’t guarantee excellence.
