How are corks produced?

The Cork Stopper: An Essential Element of Wine Culture

The cork stopper plays a fundamental role in wine preservation. It protects bottled wine fromoxidation, while allowing it to age gently. But how are these natural corks produced? Discover the fascinating process of their manufacture.

1. Cork harvesting

It all starts with the harvesting of cork, which is the bark of the cork oak(Quercus suber). This harvest takes place mainly in summer, every nine years, when the bark has reached a sufficient thickness to be extracted without damaging the tree.

Specialized harvesters, known as "tiradores", use special axes to gently strip the bark into panels. This work requires great expertise, as it is essential not to damage the tree, which will continue to produce cork for many decades to come.

2. Boiling the cork

After harvesting, the bark panels are transported to processing plants. Here, they are boiled in large vats to remove impurities, dirt and tannin residues. This step also softens the material and improves its quality.

3. Transforming cork into corks

Once boiled, the cork sheets are cut into small disks for use as corks. Cutting is optimized to limit waste and maximize material utilization.

These disks are then machined to the perfect size and shape for the different wine bottles. This precision work guarantees optimal sealing and excellent wine preservation.

4. Quality control

Before being used, corks undergo rigorous quality control. Each cork is meticulously inspected for imperfections such as cracks, holes or contamination.

Only corks meeting the highest standards are selected for use on wine bottles, ensuring a reliable, long-lasting closure.

5. Cork grading

Once tested, corks are graded by quality. The best corks, used for grands crus and fine wines, are made from defect-free cork discs. Those with slight irregularities are intended for everyday wines.

6. Personalized corks

Some corks are personalized to reflect the identity of the producer or winery. This personalization is carried out using machines that engrave the producer's name or the vineyard's logo on the surface of the cork.

This step adds a touch ofelegance and authenticity to the bottles, reinforcing their identity and exclusivity.

7. Packaging and shipping

Once finalized, the corks are carefully packed in special bags or boxes to preserve their cleanliness and protect them from external contamination.

They are then shipped worldwide to wineries and wine cellars, where they are used to ensure the preservation of the finest wines.

Conclusion

The cork stopper is much more than a simple accessory. It is the fruit of craftsmanship and a profound respect for nature. From the harvesting of the cork to its transformation into a stopper, each stage is carried out with precision to guarantee optimum quality.

Its role is essential: not only does it protect the wine from oxidation, it also provides the ideal conditions for ageing. That's why, even today, it remains the preferred choice of wine lovers and producers the world over.