| 摘要 |
Cork head made of plastic material, particularly for a cognac bottle cork, comprising a hollow central spigot (16), a first external cylindrical annular rim (12), a second concentric cylindrical annular rim (14) of smaller diameter, and cross-pieces (34) disposed between these two rims, characterised in that it comprises at least two concentric ribs (24, 26) whose height is less than that of the rims, the cross-sectional area of these ribs being substantially equal to half of the annular area included between the second rim and the central spigot. <IMAGE>
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