초록 ▼

A method for making parallelepiped or brick-shaped containers of greater mechanical strength and better appearance, avoiding any mismatching of the printed patterns due to displaced joints in the middle of the side of the container walls. A longitudinal seal is positioned at the corners rather than

A method for making parallelepiped or brick-shaped containers of greater mechanical strength and better appearance, avoiding any mismatching of the printed patterns due to displaced joints in the middle of the side of the container walls. A longitudinal seal is positioned at the corners rather than on the face of the side walls, thus leaving the side walls without joints or splices. A packaging material web taped coated with thermoplastic material and provided with folding lines is twisted when passing through two bending rollers and one slack-absorbing roller and is converted into a cylindrical shaped and then sealed at the overlapping side edges. The cylindrical container is then filled with a liquid through a filler pipe and sealed at predetermined intervals.

대표청구항 ▼

A method of manufacturing a parallelepiped packaging container comprising the sequential steps of: forming preliminary creased tape-shaped packaging material coated with thermoplastic resin into tubular configuration; thermally fusing lengthwise edge portions of said web; charging contents thereinto

A method of manufacturing a parallelepiped packaging container comprising the sequential steps of: forming preliminary creased tape-shaped packaging material coated with thermoplastic resin into tubular configuration; thermally fusing lengthwise edge portions of said web; charging contents thereinto; sealing said web at specific lengthwise intervals; separating thus sealed objects into individual units; and inwardly folding the upper and lower portions before eventually forming a complete parallelepiped packaging container; wherein a manufacturing apparatus for said method is provided with a plurality of functional rollers including an upper bending roller which is installed to a specific position above said manufacturing apparatus and provided with horizontally disposed axially line for turning the movement of said packaging material web in a downward direction, lower bending roller which is installed below said upper bending roller, said lower bending roller being provided with an axial line at a specific angle against said axial line of said upper bending roller; and a slack absorbing roller which is installed between said upper and lower bending rollers for absorbing slack from said packaging material web while it is being moved between said upper and lower bending rollers so that the slack caused by distortion of said web can be eliminated; wherein said manufacturing apparatus executes operations for manufacturing packaging containers comprising the sequential steps of: allowing a surface of said web to incline against the direction of said axial line of said upper bending roller while said packaging material is fed in the downward direction; forming said packaging material web into a tubular configuration by applying tube-forming elements which are installed below said lower bending roller; charging the contents therein after thermal fusion is applied to lengthwise edges of said circular web so that a vertically sealed portion is positioned at a corner of side walls of a packaging container blank when said circular web is sealed into a square configuration in cross section at specific intervals by a sealing device which opens and closes in the direction of the lateral movement of said packaging material web.