Plastic Wine Corks
In order to alleviate the problem of cork
taint, synthetic cork closures were adopted by some bottlers. The new
"plastic" corks are still used by some vintners, but they are not the
perfect solution. In fact, they are so sticky, removal from the bottle is
difficult and removal from standard corkscrews almost impossible. Wine spoilage
is also a problem with plastic corks because they lose elasticity over time,
and let in too much air. This causes oxidation of the wine, and often results
in formation of acetic acid as described above. In general, the plastic corks
decrease the shelf life and may spoil wines that are meant to age longer. The
plastic alternative has been a disappointment.
Changing Tradition: Wineries Go to Screw
Tops
A 30-month study conducted by Hogue
Cellars, a winery in the Columbia Valley region of Washington State, compared
synthetic cork, natural cork and a type of screw top called a
"Stelvin" cap. Their findings suggest that the screw caps are
superior closures to either of the alternatives. Granted, Hogue Cellars is
fanatical about the merits of screw caps.