Packaging and filling device, paper container and blank

A paper container comprising a cylindrical body having four sidewalls and a substantially square cross-section, a top and a bottom, the paper container formed by a packaging and filling device,

• wherein the paper container is formed of a blank prepared by cutting a band-shaped packaging material including an outermost thermoplastic layer, a paper layer and an outermost thermoplastic layer, and wherein the blank further includes:
• a first bottom panel and a third bottom panel extended from the respective lower sides of a first panel and a third panel, which are one pair of two container sidewalls opposed to each other;
• a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel, which are the other pair of two container sidewalls opposed to each other;
• a plurality of top panels corresponding to the top of the paper container;
• wherein the third bottom panel has a sixth panel partially extended from the center of the lower side of the third bottom panel, and
• wherein the sixth panel has a width which is 15-65% of a total length of the lower side of the third bottom panel, and a height configured to enable bending;
• wherein the bottom of the paper container is formed by:
• bending the sixth panel outward;
• bending the second bottom panel and the fourth panel into triangular flaps with the lower side surfaces of the second and the fourth bottom panels faced outward and bending the second and the fourth bottom panels inward;
• stacking the first bottom panel and the third bottom panel on the outsides of the second bottom panel and the fourth bottom panel with the first bottom panel positioned outside of the third bottom panel, and
• pressing from the inside and the outside, and heat-sealing;
• wherein the packaging and filling device comprises:
• a loading unit configured to take out a selected blank from a bundle of a plurality of vertically sealed and flattened blanks;
• a bottom forming unit configured to form the bottom of the cylindrical blank to form the container having the top opening and the bottom;
• a filling unit configured to fill liquid food through the top opening;
• and
• a top sealing unit configured to heat-seal the top opening;
• wherein the loading unit further includes:
• a taking-out unit which takes out the blank and includes a making bendable unit which bends the sixth panel outward and makes the sixth panel bendable;
• an erecting unit configured to erect the flattened blank into the cylindrical blank;
• and
• an infeeder which inserts a mandrel of the bottom forming unit into the cylindrical blank with the sixth panel made bendable,
• wherein the making bendable unit is a sector piece provided on the shaft of a rotary roller which receives and transfers the blank taken out, and provided at a position corresponding to the sixth panel;
• wherein the infeeder includes:
• a carrier which moves together with the sixth panel of the cylindrical blank, and
• a prior bending block fixed to a position immediately before the mandrel, wherein as the carrier is moved downward, the sixth panel follows the carrier to be bent with the corners of the forward end of the prior bending block;
• wherein the heating station of the bottom forming unit includes:
• a nozzle surface of a heat for heating the container bottom panel, and
• bending claws provided on the nozzle surface for heating the inside surface of the third bottom panel, wherein two pointed claws are erected toward the third bottom panel;
• wherein the bottom forming unit includes a press station configured to press the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface, the press station including a triangular emboss provided on the forward side surface of the mandrel at a position corresponding to the sixth panel and abutting a position where the third bottom panel is exposed on the inside surface of the container, whereby
• the sixth panel bent is laid between the first bottom panel and the third bottom panel, and the side surfaces of the respective bottom panels and the six panel are not exposed on the inside surface of the bottom of the container.

A blank for a paper container comprising a cylindrical body having four sidewalls and a substantially square cross-section, a top and a bottom, the paper container formed by a packaging and filling device,

• wherein the paper container is formed of a blank prepared by cutting a band-shaped packaging material including an outermost thermoplastic layer, a paper layer and an innermost thermoplastic layer, and wherein the blank further includes:
• a first bottom panel and a third bottom panel extended from the respective lower sides of a first panel and a third panel, which are one pair of two container sidewalls opposed to each other;
• a second bottom panel and a fourth bottom panel extended from the respective lower sides of a second panel and a fourth panel, which are the other pair of two container sidewalls opposed to each other;
• and
• a plurality of too panels corresponding to the top of the paper container;
• wherein the third bottom panel has a sixth panel partially extended from the center of the lower side of the third bottom panel, and
• wherein the sixth panel has a width which is 15-65% of a total length of the lower side of the third bottom panel, and a height configured to enable bending;
• wherein the bottom of the paper container is formed by:
• bending the sixth panel outward,
• bending the second bottom panel and the fourth panel into triangular flaps with the lower side surfaces of the second and the fourth bottom panels and bending the flap inward;
• stacking the first bottom panel and the third bottom panel on the outsides of the second bottom panel and the fourth bottom panel with the first bottom panel positioned outside of the third bottom panel, and
• pressing from the inside and the outside, and heat-sealing;
• wherein the packaging and filling device comprises:
• a loading unit configured to take out a selected blank from a bundle of a plurality of vertically sealed and flattened blanks;
• a bottom forming unit configured to form the bottom of the cylindrical blank to form the container having the top opening and the bottom;
• a filling unit configured to fill liquid food through the top opening;
• and
• a top sealing unit configured to heat-seal the top opening;
• wherein the loading unit further includes:
• a taking-out unit which takes out the blank and includes a making bendable unit which bends the sixth panel outward and makes the sixth panel bendable;
• an erecting unit configured to erect the flattened blank into the cylindrical blank;
• and
• an infeeder which inserts a mandrel of the bottom forming unit into the cylindrical blank with the sixth panel made bendable,
• wherein the making bendable unit is a sector piece provided on the shaft of a rotary roller which receives and transfers the blank taken out, and provided at a position corresponding to the sixth panel;
• wherein the infeeder includes:
• a carrier which moves together with the sixth panel of the cylindrical blank, and
• a prior bending block fixed to a position immediately before the mandrel,
• wherein as the carrier is moved downward, the sixth panel follows the carrier to be bent with the corners of the forward end of the prior bending block;
• wherein the heating station of the bottom forming unit includes:
• a nozzle surface of a heat for heating the container bottom panel, and
• bending claws provided on the nozzle surface for heating the inside surface of the third bottom panel, wherein two pointed claws are erected toward the third bottom panel;
• wherein the bottom forming unit includes a press station configured to press the container bottom from the outside and the inside by the forward side surface of the mandrel and a press surface, the press station including a triangular emboss provided on the forward side surface of the mandrel at a position corresponding to the sixth panel and abutting a position where the third bottom panel is exposed on the inside surface of the container,
• wherein the top of the paper container is roof-shaped.