Opening of containers
AssigneeTetra Pak International AB
InventorLars C. Carlsson
Life of this patent
Estimating the term…
Abstract
Containers made of flexible material often have opening arrangements in the form of a tear strip for opening an outlet aperture. The tear strip constitutes a part of the container wall and is limited by a weakening line. To facilitate initiation of the tear-open operation a short length of the weakened line has the form of a cut or cuts extending fully through the material. Two or more cuts may form a lug or projection, and if located at a fold line of the container blank the lug or projection may be arranged to automatically extend outwards from the finished container.
Claims7
A container having first and second adjacent walls, said first wall including an opening arrangement comprising a line of perforations defining a tear strip which may be lifted to provide an opening in said first wall, a masking seal sheet attached to the inside of said first wall fully covering said opening, said sheet being bonded to the inside of a smaller area of the tear strip to tear an aperture corresponding to said area upon lifting said tear strip, said first and second walls cooperating to form a lug which lies adjacent said second wall and is connected to said first wall by a first fold line and to said second wall by a second fold line and is further defined by additional intersecting fold lines, said tear strip extending across said first fold line, said lug, and one of said intersecting fold lines, the portion of said tear strip which extends across said one intersecting fold line being bounded by a continuous cut extending from said one intersecting fold line in a loop to form a projection which extends outwardly from said one intersecting fold line, whereby said projection assists in the lifting of said tear strip to form the aperture for removing the contents from said container.
Dependencies are inferred from the claim text.