| 摘要 |
<p>An applicator (2) has an applicator surface with at least one aperture (61) and a one-way closure (62b) to allow the prod. to be dispensed without letting in the ambient air. The closure comprises a valve which opens under the pressure of the prod. as it is being dispensed and closes once the pressure stops. The valve is situated adjacent to the outlet aperture and is made in one piece with the applicator tip, pressing elastically against a seat. The tip is made from a material selected from elastomers including polyethylene, polyurethane, polyester, polyether block amides, polyvinyls, ethylene terpolymers, polypropylene and diene, styrene-butadiene sequence polymers, silicones, nitrile rubbers and latex.</p> |
