paper container

Abstract

To obtain a paper container which has a gable roof shaped top part, and has openability and sealability in a well-balanced manner.SOLUTION: A first non-adhesive area 21 formed by applying a release agent is provided on an inner surface of an inner top seal panel 17 included in a gable wall forming panel 7 on one side, and second non-adhesive areas 22, 23 formed by applying a release agent overlapping the first non-adhesive area 21 to a portion A on the inner top seal panel 17 side where the first non-adhesive area 21 is provided from a center C in a lateral direction are provided on inner surfaces of outer top seal panels 13, 14 of gable roof forming panels 5, 6 located on both sides, and furthermore a first pseudo-adhesion area 25 formed by applying a release agent to a predetermined length in the lateral direction from end portions 22a, 23a on the central side of the second non-adhesive areas 22, 23 in the lateral direction to a portion B on an inner top seal panel 18 side where the first non-adhesive area 21 is not provided is provided on the inner surface of the outer top seal panel 13.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paper container called a gable top type having a gable roof-shaped top for containing a beverage liquid, which has a good balance between openness and airtightness.

Background Art

[0002] FIG. 5 shows a paper container 1 called a gable top type, FIG. 6 shows an opened state of the paper container 1 shown in FIG. 5, and FIGS. 7 and 8 show explanatory diagrams of the developed main part of the inner surface of the conventional paper container 1 shown in FIG. 5, respectively. For this type of paper container 1, a paperboard material laminated with a thermoplastic resin on both sides is used. Four body panels 2 are each folded from a vertical fold line 3, and the body panels 2 on one side and the other side are joined by a vertical seal panel 4 serving as a pasting margin to form a body part 9 having a square cross-section.

[0003] Also, at each upper end of the opposing body panels 2, a pair of opposing gable roof forming panels 5, 6 and a pair of opposing ridge wall forming panels 7, 8 that are to be folded between these gable roof forming panels 5, 6 are continuously provided via a horizontal fold line 10, respectively. At each upper end of the gable roof forming panels 5, 6, strip-shaped outer top seal panels 13, 14 are provided via horizontal fold lines 11, 12, respectively, and at each upper end of the ridge wall forming panels 7, 8, strip-shaped inner top seal panels 17, 18 are provided via horizontal fold lines 15, 16, respectively. The height dimension of the strip of the inner top seal panels 17, 18 is formed lower than that of the outer top seal panels 13, 14.

[0004] Then, the ridge wall forming panels 7, 8 are folded between the gable roof forming panels 5, 6, and the opposing surfaces of the opposing outer top seal panels 13, 14 and the inner top seal panels 17, 18 are heat-sealed together, and the opposing surfaces of the outer top seal panels 13, 14 and the opposing surfaces of the inner top seal panels 17, 18 are also heat-sealed together to form a gable roof-shaped top part 19.

[0005] To open the paper container 1 formed in this manner, first, the gable roof forming panels 5, 6 and one of the gable wall forming panels 7, which is folded between the gable roof forming panels 5, 6 and sealed on opposite sides, are peeled apart by spreading them to the left and right (primary opening). Next, the inner top seal panel 17 is peeled away from the outer top seal panels 13, 14 by pulling out one of the gable wall forming panels 7 (secondary opening). Finally, one of the gable wall forming panels 7 is pulled out all the way towards the user (tertiary opening), which serves as the spout 20 (see Figure 6).

[0006] 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, by applying a release agent to both ends in the transverse direction, leaving an end seal area of ​​a predetermined width. 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 transverse 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).

[0007] 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, or 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. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2000-79939 [Patent Document 2] Patent No. 5943473 [Patent Document 3] Japanese Patent Publication No. 2012-236647 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] As shown in Figure 7, when the ends 22a and 23a of the second non-adhesive regions 22 and 23 provided on the outer top seal panels 13 and 14 are set to coincide with the center C in the lateral direction of the outer top seal panels 13 and 14, the opposing surfaces of the portion B on the inner top seal panel 17 side from the center C of the outer top seal panels 13 and 14 are sealed together. This ensures a secure seal up to the point where the gable wall forming panel 7 folded between the gable roof forming panels 5 and 6 contacts the folded corner portion 24 of the inner top seal panel 17, preventing leakage of beverage liquids through the folded corner portion 24 of the inner top seal panel 17 and providing excellent airtightness. However, on the other hand, it is not easy to separate the folded corner portion 24 of the inner top seal panel 17 from the outer top seal panels 13 and 14, resulting in difficulties in opening.

[0010] Furthermore, as shown in Figure 8, if the approximately central ends 22a and 23a of the second non-adhesive regions 22 and 23 are set to a position 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, the second non-adhesive regions 22 and 23 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 8 side. This allows the folded corner 24 of the inner top seal panel 17 to be easily separated from the outer top seal panels 13 and 14, resulting in excellent openability. However, on the other hand, the opposing surfaces of the portions B on the inner top seal panel 18 side from the center C of the outer top seal panels 13 and 14 are not sealed up to the folded corner 24 of the inner top seal panel 17. As a result, the non-adhesive portion between the sealing end of the outer top seal panels 13 and 14 and the folded corner 24 of the inner top seal panel 17 forms a tunnel, which may cause beverage liquid to leak, resulting in poor airtightness.

[0011] The object of the present invention is to provide a paper container having a gable roof-shaped top that offers a good balance between ease of opening and airtightness. [Means for solving the problem]

[0012] To achieve the above objective, the invention described in claim 1 comprises a cardboard material with thermoplastic resin laminated on both sides, comprising four body panels, the edges of which are joined by vertical sealing panels to form a cylindrical body with a rectangular cross-section, a pair of gable roof forming panels facing each other and having a strip-shaped outer top sealing panel on the upper end of the body panels, 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, the gable wall forming panels are folded between the gable roof forming panels so that the opposing surfaces of the opposing outer top sealing panels and the opposing surfaces of the inner top sealing panels are sealed together, and a gable roof top is formed by sealing the opposing surfaces of the outer top sealing panels and the opposing surfaces of the inner top sealing panels, and a first non-adhesive region is provided on the inner surface of the inner top sealing panel of one of the gable wall forming panels that is folded between the gable roof forming panels, by applying a release agent to both ends in the transverse direction, leaving an end sealing area of ​​a predetermined width. The aforementioned inner top seal panel On the inner surface of each of the outer top seal panels of the pair of gable roof forming panels located on both sides, The aforementioned outer top seal panel A paper container is provided in which a second non-adhesive region is formed by applying a release agent that overlaps with the first non-adhesive region to the portion of the inner top seal panel side where the first non-adhesive region is provided, starting from the center in the lateral direction of the container, and when opened, the gable wall forming panel on the side having the inner top seal panel where the first non-adhesive region is provided is pulled out to form a spout, characterized in that a first pseudo-adhesive region is provided on the inner surface of the outer top seal panel of one of the pair of gable roof forming panels, in the portion of the inner top seal panel side where the first non-adhesive region is not provided, by applying a release agent of a predetermined length in the lateral direction from the central end of the second non-adhesive region in the lateral direction.

[0013] According to the invention described in claim 1, 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 in the portion on the inner top seal panel side where the first non-adhesive area is not provided, 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. Therefore, when the opposing surfaces of the outer top seal panels are sealed together, the portion on the inner top seal panel side where the first non-adhesive area is not provided, that contacts the folded corner of the inner top seal panel where the first non-adhesive area is provided, becomes the first pseudo-adhesive area, and the space between the inner surface of the outer top seal panel and the folded corner of the inner top seal panel is sealed by the first pseudo-adhesive area, thereby preventing beverage liquid from leaking out of the paper container via the folded corner of the inner top seal panel.

[0014] Furthermore, when opening the container, if force is applied in the pulling direction to the end wall forming panel on the side having the inner top seal panel, the first pseudo-adhesive area that is pseudo-adhering to the outer top seal panel will peel off with little force, creating a space between the inner surface of the outer top seal panel and the folded corner of the inner top seal panel. By placing a finger in this space, the end wall forming panel can be easily pulled out and the spout can be opened.

[0015] The invention described in claim 2 is 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 as described in claim 1, or on the inner surface of the outer top seal panel having the pair of gable roof forming panels, by applying a release agent along the upper end of the first non-adhesive region or the second non-adhesive region.

[0016] According to the invention described in claim 2, 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, by applying a release agent along the upper end of the first non-adhesive region or the second non-adhesive region. Therefore, when the inner surface of the inner top seal panel where the first non-adhesive region is provided and the inner surface of the opposing outer top seal panel of the gable roof forming panel where the second non-adhesive region is provided are sealed, the upper ends of the overlapping first non-adhesive region and the second non-adhesive region between the inner surface of the outer top seal panel and the inner surface of the inner top seal panel become the second pseudo-adhesive region. This prevents liquid beverages from seeping out from between the upper end of the first non-adhesive region and the upper end of the second non-adhesive region, thereby further improving airtightness.

[0017] Furthermore, when opening the package, the second pseudo-adhesive region between the inner surface of the outer top seal panel and the inner surface of the inner top seal panel peels off with little force, so it does not make it difficult to pull out the end wall forming panel.

[0018] The invention described in claim 3 is characterized in that, as described in claim 1 or 2, the length in the lateral direction of the first pseudo-adhesive region does not exceed the length of the vertical width of the second non-adhesive region.

[0019] According to the invention described in claim 3, the length of the first pseudo-adhesive region in the lateral direction does not exceed the length of the second non-adhesive region. Therefore, the presence of the first pseudo-adhesive region has little effect on the adhesion between the opposing surfaces of the opposing outer top seal panels, and sufficient adhesive strength can be obtained. [Effects of the Invention]

[0020] As described above, according to the paper container of the present invention, on the inner surface of the outer top seal panel of one of the pair of gable roof forming panels, a first pseudo-adhesive region is provided which is formed by applying a release agent having a predetermined length in the horizontal length direction from the central side end portion in the horizontal length direction of the second non-adhesive region to a portion on the inner top seal panel side where the first non-adhesive region is not provided. Therefore, a paper container having a good balance between openability and airtightness can be obtained.

Brief Description of the Drawings

[0021] [Figure 1] It is an exploded explanatory view of a main part of the inner surface showing a first example of an embodiment of a paper container according to the present invention. [Figure 2] It is an exploded explanatory view of a main part of the inner surface showing another example of the first pseudo-adhesive region shown in FIG. 1. [Figure 3] It is an exploded explanatory view of a main part of the inner surface showing a second example of an embodiment of a paper container according to the present invention. [Figure 4] It is an exploded explanatory view of a main part of the inner surface showing another example of the second pseudo-adhesive region shown in FIG. 3. [Figure 5] It is a perspective view showing a gambrel top type paper container. [Figure 6] It is an explanatory view showing the opened state of the paper container shown in FIG. 5. [Figure 7] It is an exploded explanatory view showing an example of a main part of the inner surface of the paper container shown in FIG. 5. [Figure 8] It is an exploded explanatory view showing another example of a main part of the inner surface of the paper container shown in FIG. 5.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, an example of an embodiment of a paper container according to the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a first example of an embodiment of a paper container according to the present invention. FIG. 1 is an exploded explanatory view of a main part of the inner surface of the paper container of the first example, and FIG. 2 is an exploded explanatory view of a main part of the inner surface showing another example of the first pseudo-adhesive region shown in FIG. 1. In addition, parts corresponding to the conventional examples shown in Figures 5 to 8 will be denoted by the same reference numerals and explained accordingly.

[0023] In this example, the paper container 1 has a first non-adhesive region 21 formed by applying a release agent to the inner surface of the inner top seal panel 17 of one end wall forming panel 7 that is pulled out to open the spout 20, leaving an end seal area of ​​a predetermined width at both ends in the lateral direction. Furthermore, on the inner surfaces of the outer top seal panels 13 and 14 of the pair of gable roof forming panels 5 and 6 located on both sides of the inner top seal panel 17, a second non-adhesive region 22 and 23 is provided, formed by applying a release agent that overlaps with the first non-adhesive region 21 provided on the inner top seal panel 17 to the portion A of the outer top seal panels 13 and 14 that is on the side of the inner top seal panel 17, from the center C in the lateral direction of the outer top seal panels 13 and 14 (the surface that faces the inner top seal panel 17 when the gable wall forming panel 7 is folded between the gable roof forming panels 5 and 6).

[0024] In this example, on only one of the gable roof forming panels 5 and 6, the inner surface of the outer top seal panel 13 of the gable roof forming panel 5 has a first pseudo-adhesive area 25 formed by applying a release agent of a predetermined length in the lateral direction from the central end 22a of the second non-adhesive area 22 to the inner surface of the inner top seal panel 18 side where the first non-adhesive area 21 is not provided. This is done by applying a release agent of a predetermined length in the lateral direction from the central end 22a of the second non-adhesive area 22.

[0025] In this context, a pseudo-adhesive area refers to a region where, after applying a release agent to only one of two opposing adhesive surfaces and then heat-sealing, the area where the release agent was applied becomes easily peelable.

[0026] In this example, the length L1 of the first pseudo-adhesive region 25, which is provided in the transverse direction from the end 22a of the second non-adhesive region 22, is in the range of 5% to 30%, preferably 10% to 20%, of L2, where L2 is half the transverse length of the outer top seal panel 13.

[0027] Furthermore, the shape of the first pseudo-adhesive region 25 is a rectangle in this example, with its upper and lower sides being the same as the upper and lower sides of the second non-adhesive region 22 (see Figure 1). However, it may also be a triangle with the upper end of the edge 22a of the second non-adhesive region 22 as its vertex (see Figure 2).

[0028] In the paper container 1 of this example configured as described above, in this example, only one of the gable roof forming panels 5 and 6 has a first pseudo-adhesive area 25 formed by applying a release agent of a predetermined length in the lateral direction from the central end 22a of the second non-adhesive area 22 to the inner top seal panel 18 side portion B on the inner top seal panel 18 side where the first non-adhesive area 21 is not provided on the inner surface of the outer top seal panel 13 of the gable roof forming panel 5, so that a gable wall is formed between the gable roof forming panels 5 and 6. When panels 7 and 8 are folded in and the opposing surfaces of the outer top seal panels 13 and 14 are sealed together, in the portion B on the inner top seal panel 17 side where the first non-adhesive region 21 is not provided, the portion that comes into contact with the folded corner 24 of the inner top seal panel 17 where the first non-adhesive region 21 is provided, which is folded between the gable roof forming panels 5 and 6, becomes the first pseudo-adhesive region 25, and the space between the inner surfaces of the outer top seal panels 13 and 14 and the folded corner 24 of the inner top seal panel 17 is sealed by the first pseudo-adhesive region 25.

[0029] This prevents beverage liquid from leaking out of the paper container 1 by traveling along the folded corner 24 of the inner top seal panel 17.

[0030] Furthermore, when opening the container, if force is applied in the pulling direction to the end wall forming panel 7 on the side with the inner top seal panel 17, the first pseudo-adhesive area 25, which is pseudo-adhered to the outer top seal panels 13 and 14, will peel off with little force, creating a space between the inner surface of the outer top seal panels 13 and 14 and the folded corner portion 24 of the inner top seal panel 17. By placing a finger in this space, the end wall forming panel 7 can be easily pulled out and the spout 20 can be opened.

[0031] In this example, the length L1 of the first pseudo-adhesive region 25, which is provided in the transverse direction from the end 22a of the second non-adhesive region 22, is in the range of 5% to 30%, preferably 10% to 20%, of L2, which is half the transverse length of the outer top seal panel 13. Therefore, the presence of the first pseudo-adhesive region 25 has little effect on the adhesion between the opposing surfaces of the opposing outer top seal panels 13 and 14, and sufficient adhesive strength can be obtained.

[0032] Figures 3 and 4 show a second example of an embodiment of the paper container according to the present invention. Figure 3 is an unfolded diagram illustrating the main inner surface of the second example paper container, and Figure 4 is an unfolded diagram illustrating another example of the main inner surface of the second pseudo-adhesive region shown in Figure 3. The paper container 1 in the second example is identical in basic structure to the paper container 1 in the first example, and the same components as in the first example are denoted by the same reference numerals.

[0033] In the second example, the paper container 1 is provided with a second pseudo-adhesive region 26 formed by applying a release agent along the upper end 21a of the first non-adhesive region 21 or the upper ends 22b, 23b of the second non-adhesive regions 22, 23 to the inner surface of the inner top seal panel 17 that is folded between the gable roof forming panels 5, 6, or to the inner surface of the outer top seal panels 13, 14 that the gable roof forming panels 5, 6 have, or along the upper ends 22b, 23b of the second non-adhesive regions 22, 23.

[0034] Figure 3 shows an example in which a second pseudo-adhesive region 26 is provided on the inner surface of the outer top seal panels 13 and 14 of the gable roof forming panels 5 and 6 by applying a release agent along the upper ends 22b and 23b of the second non-adhesive regions 22 and 23. Figure 4 shows an example in which a second pseudo-adhesive region 26 is provided on the inner surface of the inner top seal panel 17 that is folded between the gable roof forming panels 5 and 6 by applying a release agent along the upper end 21a of the first non-adhesive region 21. The rest of the configuration is the same as in the first example, so we will refer to the explanation in the first example.

[0035] According to the paper container 2 of this example configured as described above, when the inner surface of the inner top seal panel 17, where the first non-adhesive region 21 is provided, is sealed to the inner surface of the opposing outer top seal panels 13 and 14 of the gable roof forming panels 5 and 6, where the second non-adhesive region 22 is provided, Between the inner surfaces of the outer top seal panels 13 and 14 and the inner surface of the inner top seal panel 17, the upper end 21a of the first non-adhesive region 21 and the upper ends 22b and 23b of the second non-adhesive regions 22 and 23 form a second pseudo-adhesive region 26. This prevents liquid from seeping out from between the upper end 21a of the first non-adhesive region 21 and the upper ends 22b and 23b of the second non-adhesive region 22, thereby further improving airtightness.

[0036] Furthermore, when opening the package, the second pseudo-adhesive region 26 between the inner surfaces of the outer top seal panels 13 and 14 and the inner surface of the inner top seal panel 17 peels off with little force, so it does not make it difficult to pull out the end wall forming panel 17. [Explanation of symbols]

[0037] 1 paper container 2. Torso Panel 3. Vertical fold line 4 Vertical sticker panel 5, 6 Gable roof forming panels 7, 8 End wall forming panel 10, 11, 12 Horizontal fold lines 13, 14 Outer top seal panel 15, 16 Horizontal fold lines 17, 18 Inner top seal panel 19. Top of a gable roof 20 spout 21 1st non-adhesive area 21a top end 22,23 2nd non-adhesive area 22a,23a end 22b,23b top end 24 Folded corner 25 1st pseudo-adhesion area 26 Second pseudo-adhesion area

Claims

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 gable roof top is formed, 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. When opened, the gable wall forming panel on the side of the inner top seal panel where the first non-adhesive area is provided is pulled out 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, 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.

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