Top forming part crease applying mechanism for paper container top forming device

A top forming part creasing mechanism in a device for forming a top portion of a paper container,

• the paper container being formed of a carton blank, which is formed into a quadrangular tubular shape, including:
• a body front panel;
• a body right side panel;
• a body left side panel;
• a body back panel;
• a top upper surface panel, which is continuously provided on an upper edge of the body back panel through a first horizontal folding line;
• a top upper surface auxiliary panel, which is continuously provided on an upper edge of the body front panel through a second horizontal folding line, and is folded on a lower side of the top upper surface panel to overlap with the top upper surface panel;
• and
• a right side panel and a left side panel, which are continuously provided on upper edges of the body right side panel and the body left side panel through third horizontal folding lines, respectively, and are folded outwardly along with overlapping of the top upper surface panel and the top upper surface auxiliary panel,
• the top upper surface panel having a suction port formed in a center thereof, the top upper surface auxiliary panel having a vertical length that prevents the top upper surface auxiliary panel from reaching the suction port formed in the top upper surface panel, the top upper surface auxiliary panel having a sealing panel continuously provided on an edge thereof through a fourth horizontal folding line,
• the top forming part creasing mechanism being configured to:
• valley-fold, along the fourth horizontal folding line, the sealing panel continuously provided on the top upper surface auxiliary panel in a state in which the carton blank is fitted onto a mandrel such that a top forming part, which includes the top upper surface panel, the top upper surface auxiliary panel, the right side panel and the left side panel of the carton blank, protrudes from a tip of the mandrel;
• bond an inner surface of the sealing panel and an inner surface of the top upper surface panel to each other to seal the carton blank;
• and
• bond the right side panel and the left side panel having been folded at respective overlapping surfaces to seal the carton blank, thereby forming a top portion,
• the top forming part creasing mechanism comprising:
• first creasing means that valley-folds, along the third horizontal folding lines, the right side panel and the left side panel of the carton blank fitted onto the mandrel so as to spread out the right side panel and the left side panel from a center toward respective outer sides of the carton blank;
• second creasing means that makes creases by inwardly mountain-folding the top upper surface panel and the top upper surface auxiliary panel along the first and second horizontal folding lines, respectively;
• and
• third creasing means that makes a crease by outwardly valley-folding the sealing panel, which is provided on the edge of the top upper surface auxiliary panel along the fourth horizontal folding line.