Bead-lock section, drum half and tire building machine

A bead-lock section for use in a first drum half between a crown-up section and a turn-up section, wherein the bead-lock section comprises a plurality of bead-lock members distributed circumferentially about a central axis, a bead-lock support configured for supporting the bead-lock members with respect to a base and a bead-lock drive configured for moving the bead-lock members with respect to the bead-lock support in a radial direction with respect to the central axis between a release position and a bead-lock position, wherein the bead-lock section comprises a bead-lock seal which is configured to extend over and seal the bead-lock member in an air-tight manner, wherein the bead-lock seal comprises a first end that is configured to be mounted in an air-tight manner to the crown-up section and a second end that is arranged to be mounted in an air-tight manner in between the bead-lock member and a mounting body directly adjacent to the bead-lock member, wherein the bead-lock seal is configured to slide along the mounting body when the bead-lock member is moved between the release position and the bead-lock position.