Method of inserting a barrier line into a closure

A method of forming a closure for application to a container comprising the steps of:

• (a) providing a closure having a top panel, a skirt depending from the top panel, and an annular sealing fin extending inwardly and downwardly from an interior of the closure and being integrally formed with the top panel, the sealing fin being adapted to engage a rim of a container and be folded into a sealing arrangement with the rim and at least a side of the finish of the container when the closure is secured to the container;
• (b) providing a disc in a position ready for insertion within the closure;
• (c) pressing said disc relatively into said closure such that at least a portion of said disc is positioned at least adjacent the top panel;
• and
• (d) applying a fluid pressure to the disc such that the entire disc is forced into a position at least adjacent the top panel.

An apparatus for positioning a disc in a closure, wherein the closure has a top panel, a skirt depending from the top panel, and an annular sealing fin extending inwardly and downwardly from an interior of the closure and being integrally formed with the top panel, the sealing fin being adapted to engage a rim of a container and be folded into a sealing arrangement with the rim and at least a side of the finish of the container when the closure is secured to the container;

• the apparatus comprising:
• (a) an insertion station for supporting a closure for at least a portion of the disc positioning process;
• and
• (b) a tool movable relative to the insertion station to relatively drive a disc into the closure, the tool comprising a plunger for relatively pressing said disc into said closure such that at least a portion of the disc is adjacent the top panel, and a fluid flow passage through which fluid travels to apply fluid pressure to the disc and force the entire disc past the sealing fin and into a position at least adjacent the top panel.