Cap for a container and a package comprising such a cap

A system for fabrication of a container, the system comprising:

• a preform comprising a neck opening into a mouth at one extremity, the preform further comprising a shoulder located about the neck proximate to the mouth;
• and
• a cap comprising a disc-shaped top section having a perimeter, the cap further comprising an annular side section projecting from the perimeter of the disc-shaped top section, the cap further comprising a locking flange disposed on the annular side section and configured to be engaged with the shoulder, the cap further comprising a locking flap extending from at least a portion of the annular side section, the locking flap movable between (a) a locked first position wherein a portion of the locking flange contiguous with the locking flap extends inwardly from an interior face of the annular side section and (b) an unlocked second position wherein the portion of the locking flange is at least partially recessed relative to the interior face of the annular side section, the cap further comprising a frangible tab by which the locking flap is immobilized in the locked first position,
• wherein the locking flap has at least one configuration selected from the group consisting of (i) the locking flap is bistably movable between the locked first position and unlocked second position, (ii) the locking flap extends from the annular side section along the entire perimeter of the annular side section, (iii) the locking flap extends from the annular side section along a portion of the perimeter of the annular side section, the locking flange is divided into an immobile first portion and a mobile second portion contiguous with the locking flap, and the immobile first portion of the locking flange extends from a segment of the annular side section comprising between 20° and 80°, inclusive, of the perimeter of the annular side section, (iv) the locking flap extends from the annular side section along a portion of the perimeter of the annular side section, the locking flange is divided into an immobile first portion and a mobile second portion contiguous with the locking flap, and the immobile first portion and the mobile second portion of the locking flange are disposed substantially symmetrically about the annular side section, and (v) the locking flap is a segment of a hollow conic frustum.

A package comprising:

• a container;
• and
• a cap disposed on the container, the cap comprising a disc-shaped top section having a perimeter, an annular side section projecting from the perimeter of the disc-shaped top section, a locking flange disposed on the annular side section and configured to be engaged with the shoulder, and a locking flap extending from at least a portion of the annular side section, the locking flap movable between (a) a locked first position wherein a portion of the locking flange contiguous with the locking flap extends inwardly from an interior face of the annular side section and (b) an unlocked second position wherein the portion of the locking flange is at least partially recessed relative to the interior face of the annular side section, the cap further comprising a frangible tab by which the locking flap is immobilized in the locked first position,
• wherein the locking flap has at least one configuration selected from the group consisting of (i) the locking flap is bistably movable between the locked first position and unlocked second position, (ii) the locking flap extends from the annular side section along the entire perimeter of the annular side section, (iii) the locking flap extends from the annular side section along a portion of the perimeter of the annular side section, the locking flange is divided into an immobile first portion and a mobile second portion contiguous with the locking flap, and the immobile first portion of the locking flange extends from a segment of the annular side section comprising between 20° and 80°, inclusive, of the perimeter of the annular side section, (iv) the locking flap extends from the annular side section along a portion of the perimeter of the annular side section, the locking flange is divided into an immobile first portion and a mobile second portion contiguous with the locking flap, and the immobile first portion and the mobile second portion of the locking flange are disposed substantially symmetrically about the annular side section, and (v) the locking flap is a segment of a hollow conic frustum.