JP-7855388-B2 - paper container

Inventors

• 石井 正康
• 大久保 勝行
• 三浦 亮
• 米 浩然

Assignees

• 日本製紙株式会社

Dates

Publication Date

20260508

Application Date

20220330

Claims (3)

1. It is made of a cardboard material with thermoplastic resin laminated on both sides, and has four body panels, the edges are joined by vertical sealing panels to form a cylindrical body with a rectangular cross-section, and at the upper end of the body panels, a pair of gable roof forming panels facing each other and having a strip-shaped outer top sealing panel on the top, and a pair of gable wall forming panels facing each other and having a strip-shaped inner top sealing panel that is lower in height than the outer top sealing panel are connected, the gable wall forming panels are folded between the gable roof forming panels, the opposing surfaces of the opposing outer top sealing panels and the opposing surfaces of the inner top sealing panels are sealed together and the opposing surfaces of the outer top sealing panels and the opposing surfaces of the inner top sealing panels are sealed together to form the top of the gable roof, and the gable roof forming The inner surface of the inner top seal panel of one of the gable wall forming panels that is folded between the panels is provided with a first non-adhesive area formed by applying a release agent to both ends in the transverse direction, leaving an end seal area of a predetermined width. The inner surface of each of the outer top seal panels of a pair of gable roof forming panels located on both sides of the inner top seal panel is provided with a second non-adhesive area formed by applying a release agent that overlaps with the first non-adhesive area to the portion of the outer top seal panel that is on the inner top seal panel side from the center in the transverse direction of the outer top seal panel. The paper container is opened by pulling out the gable wall forming panel on the side of the inner top seal panel where the first non-adhesive area is provided to form a spout. A paper container characterized in that, on the inner surface of the outer top seal panel of one of the pair of gable roof forming panels, a first pseudo-adhesive area is provided, which is formed by applying a release agent of a predetermined length in the lateral direction from the central end in the lateral direction of the second non-adhesive area to the portion on the inner top seal panel side where the first non-adhesive area is not provided.
2. The paper container according to claim 1, characterized in that a second pseudo-adhesive region is provided on the inner surface of the inner top seal panel folded between the pair of gable roof forming panels, or on the inner surface of the outer top seal panel of the pair of gable roof forming panels, formed by applying a release agent along the upper end of the first non-adhesive region or the second non-adhesive region.
3. The paper container according to claim 1 or 2, characterized in that the length of the first pseudo-adhesive region in the lateral direction does not exceed the length of the second non-adhesive region.

Description

This invention relates to a gable-top type paper container for containing beverage liquids, which has a gable roof-shaped top and offers a good balance of openability and airtightness. Figure 5 shows a paper container 1 called a gable-top type, Figure 6 shows the opened state of the paper container 1 shown in Figure 5, and Figures 7 and 8 show explanatory diagrams of the internal main parts of the conventional paper container 1 shown in Figure 5, respectively. This type of paper container 1 uses a cardboard material with thermoplastic resin laminated on both sides. Four body panels 2 are folded along vertical fold lines 3, and the body panels 2 on one side and the other side are joined together by vertical sealing panels 4 that serve as adhesive surfaces to form a cylindrical body 9 with a rectangular cross-section. Furthermore, at the opposing upper ends of the four body panels 2, a pair of opposing gable roof forming panels 5 and 6, and a pair of opposing gable wall forming panels 7 and 8, which are folded between these gable roof forming panels 5 and 6, are connected via horizontal fold lines 10. At the upper ends of the gable roof forming panels 5 and 6, strip-shaped outer top seal panels 13 and 14 are provided via horizontal fold lines 11 and 12, respectively. Similarly, at the upper ends of the gable wall forming panels 7 and 8, strip-shaped inner top seal panels 17 and 18 are provided via horizontal fold lines 15 and 16, respectively. The height dimension of these inner top seal panels 17 and 18 is lower than that of the outer top seal panels 13 and 14. Then, the gable wall forming panels 7 and 8 are folded between the gable roof forming panels 5 and 6, and the opposing surfaces of the outer top seal panels 13 and 14 and the inner top seal panels 17 and 18 are heat-sealed. Simultaneously, the opposing surfaces of the outer top seal panels 13 and 14 and the opposing surfaces of the inner top seal panels 17 and 18 are heat-sealed, thereby forming the gable roof apex 19. To open the paper container 1 formed in this manner, first, the gable roof forming panels 5 and 6 and one of the gable wall forming panels 7, which is folded between the gable roof forming panels 5 and 6 and has its opposing surfaces sealed, are peeled apart by spreading them to the left and right (first opening). Next, the inner top seal panel 17 is peeled away from the outer top seal panels 13 and 14 by pulling out one of the gable wall forming panels 7 (second opening). Finally, one of the gable wall forming panels 7 is pulled out completely towards the user (tertiary opening), revealing the spout 20 (see Figure 6). To facilitate such opening, a first non-adhesive region 21 is provided on the inner surface of the inner top seal panel 17 of one of the gable wall forming panels 7 that is pulled out to open the spout 20. This region is formed by applying a release agent to both ends in the lateral direction, leaving a predetermined width of end seal area. Second non-adhesive regions 22 and 23 are provided on the inner surfaces of the outer top seal panels 13 and 14 of the gable roof forming panels 5 and 6 located on either side of the first non-adhesive region 21, by applying a release agent to the portion A from approximately the center in the lateral direction towards the inner top seal panel 17, overlapping with the first non-adhesive region 21. The inner top seal panel 17 and the outer top seal panels 13 and 14 are then heat-sealed via the first non-adhesive region 21 and the second non-adhesive regions 22 and 23 (for example, Patent Documents 1, 2, and 3). As for the second non-adhesive areas 22 and 23 provided on the outer top seal panels 13 and 14, as shown in Figure 7, the ends 22a and 23a of the second non-adhesive areas 22 and 23 are set to coincide with the center C in the lateral direction of the outer top seal panels 13 and 14. Alternatively, as shown in Figure 8, the ends 22a and 23a of the second non-adhesive areas 22 and 23 are set to extend beyond a predetermined length from the center C of the outer top seal panels 13 and 14 to the portion B on the inner top seal panel 18 side. Japanese Patent Publication No. 2000-79939Patent No. 5943473Japanese Patent Publication No. 2012-236647 This is an exploded view illustrating the main internal structure of a first example of an embodiment of the paper container according to the present invention.Figure 1 is an explanatory diagram of the internal structure of the main part, showing another example of the first pseudo-adhesion region.This is an exploded view illustrating the inner surface of a second embodiment of the paper container according to the present invention.Figure 3 is an explanatory diagram of the internal structure of the main part, showing another example of the second pseudo-adhesion region.This is a perspective view showing a gable-top type paper container.Figure 5 is an explanatory diagram showing the opened state of the paper container.Figure 5 is an exploded vi