US Patent 9493278 Penetrable plastics material seal for sealing containers

Plastics material seal (1) for containers (10), comprising a receiving region, for receiving an opening portion (10a) of a plastics material container, and comprising a puncturing region (2), which is suitable for being and intended to be penetrated by a piercing means in a predetermined piercing direction (L), this puncturing region (2) being arranged on a lid surface (1a) of the plastics material seal. According to the invention, the plastics material seal (1) comprises a reinforcing means (20), which is arranged offset from the puncturing region (2) in the piercing direction and which is suitable for increasing a force which counteracts the piercing means through the puncturing region (2) during the piercing process, the plastics material seal (1) advantageously being formed in a single part.