High-tech wine cap

A design for a high-tech closure for wine bottles that would allow the wine to breathe much like traditional bark corks won the $15,000 first prize in the annual Big Bang! Business Plan Competition at the University of California, Davis.

The screw-cap concept could help prevent some $10bn worth of wine from being ruined every year by cork taint.

The high-tech wine cap was developed by MBA student Tim Keller, a UC Davis viticulture and enology alumnus who worked for ten years as a winemaker in Sonoma and Napa counties before enrolling in the Graduate School of Management, and his teammates, Kevin Chartrand and Diana Mejia.

Chartrand, a fellow MBA candidate with an undergraduate degree in materials science, worked as a thin-film expert at IBM. Mejia, a former engineer for Anheuser-Busch, is earning a master's degree in food engineering.

Their team, Advanced Enological Closures, set out to design a better bottle cap because cork taint, a byproduct of a fungus that infects cork and makes wine smell like mouldy mop water, now contaminates the corks of an estimated one in 20 wine bottles on store shelves, ruining billions of dollars of wine annually.

Although synthetic corks have been developed in response to the problem, they allow too much oxygen into the bottle, according to Keller. Overly oxidised wine has a shorter shelf life and can develop a fingernail-polish odour.

Screw caps - another alternative to bark corks - are a viable option for wine white, but do not allow in enough oxygen for fine red wines, Keller said. Without enough oxygen to draw on, red wines start to smell like burned rubber or matchsticks as they age.

The team's design, a 'breathing screw cap,' has small vent holes and is fitted with a liner made of alternating layers of thin metal and a porous polymer. The liner can be customised to allow optimal oxidation for specific varietals, something that is impossible with bark corks. A patent is pending for the design.

'If you open up lots of bottles of the same wine, you'll notice variability from bottle to bottle because of differences in the amount of oxygen that gets in,' Keller said. 'With cork, you just never know. Our product will give a level of control that the wine industry has never had.'

The cap would sell for 20 cents a unit - or 10 to 11 cents per unit less than cork-and-foil closures, and only 5 cents more per unit than ordinary screw caps and synthetic corks, according to the team's projections.

For more information on the competition, visit the Big Bang! Web site at http://bigbang.gsm.ucdavis.edu.