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1 March 2026
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Screw
Caps for Wine Bottles
Major news within the wine industry concerns the
ambitious efforts of 27 New Zealand wine producers to
introduce the latest version of Stelvin or Supervin,
aluminium-alloy screw-capped bottle closures in place of
traditional cork. Some international observers might be
surprised that highly reputed names like Lawson's Dry Hills,
Giesen Wine Estate and Kumeu River Wines are amongst the
participants. However the degree of commitment to using
screw caps varies within the group. Some producers, like
Lawson's Dry Hills, have resolved to place screw-cap
closures on all their 2001 production, whilst others have
selected certain countries for experimentation. The move
follows the introduction, in the 2000 vintage, of similar
closures by 15 Australian producers who limited its use to
the Riesling varietal.
American wine and food expert, Chef Piero Biondi, asked on
his US nationwide Cable Radio Network show for his reaction,
pooh-poohed the potential. 'You cannot tell me that at that
beautiful candlelit supper someone is going to get out the
screw-cap, people are just not going to do it. Come on,
consumers are going to take a lot of convincing about this
one.'
Several years of problems with TCA, best explained as a cork
infection which imparts an unpleasant taste to wine, have
seen wineries undertaking various experiments. A number of
Napa and Sonoma wineries in California are alleged to be
suing a major French cork producer, after purchasing
millions of artificial corks which have reportedly resulted
in badly tainted wines.
Yet the South African wine Kumala has achieved its
widespread international success with artificial corks,
though it was reported to have changed brands on one
occasion. Also Saint Francis from Sonoma, a pioneer of
artificial corks, has gathered a string of plaudits and
awards for its wines during the last couple of years.
Perhaps most consumers still remember the cheap, ill-fitting
screw caps of a generation ago which were so leaky that the
wines concerned had to be pasteurised to prevent oxidation.
The subsequent results could be politely described as being
of limited quality. The new generation of screw caps claims
to be air-tight and besides, many producers are protecting
the surface of the wine with a whiff of nitrogen. Also we
mustn't forget that some artificial corks have found great
favor with wineries, both humble and great. Supreme Corq
and Nomacorc are two names which have found a popular
following - but even they do not please everyone.
Be certain there are a lot of laboratories burning midnight
oil in the rush, (or rather slow painful haul), to find the
answer. If only we could spy on them
Excerpt from Wine
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