| 摘要 |
<p>The invention relates to a tube head (2) made of plastic material formed in a single piece and produced by a molding process, said head comprising a first cylindrical wall (7) including a thread (8) on the outer surface thereof and a second smaller cylindrical wall (9), placed inside the first cylindrical wall (9), the two cylindrical walls (7,9) being coaxial, the inner face of the second cylindrical wall (9) comprising a discontinuous thread (10,11) defined by a series of sectors (10) and interruptions (11). The invention also relates to a device and a method for producing the tube head.</p> |
