paper container

Abstract

To provide a paper container configured so that a corner portion at a top of a trunk part can be easily folded toward the inside of the paper container when being opened and motion of folding the corner portion at the top part toward the inside of the paper container and motion of widening a gable wall formation panel laterally can be easily performed as a series of motion.SOLUTION: In a gable roof-type paper container 1, in which a gable wall formation panel 24 to be opened folded back between gable roof formation panels 16 and 17 is pulled out to open a spout port, two auxiliary folding lines 48 and 49 striding over the top part horizontal folding line 26 are positioned on virtual lines L1 and L2 connecting the top 50 of nearly triangular surface part 37 to intersections 51 and 52 between end parts of left and right trunk part vertical folding lines 4 and 5 of the trunk part panel 8 and left and right end parts of a bottom part horizontal folding line 42 and are formed along the virtual lines L1 and L2, in a nearly triangular surface part 37 surrounded by folding lines 34 and 35 for folding back and a top part horizontal folding line 26 in the gable wall formation panel 24 and a trunk part panel 8 to be opened linked to the gable wall formation panel 24.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a paper container for containing a liquid content.

Background Art

[0002] Conventionally, as a paper container for containing liquid contents such as milk and juice, it is made of a paperboard material laminated with a thermoplastic resin on the front and back surfaces, has four body panels, and the edges are joined by a vertical seal panel to form a square cylindrical body. At the upper end of the body panel, there are a pair of gable roof forming panels having an outer top seal panel at the top and facing each other, and a pair of gable wall forming panels having an inner top seal panel at the top and facing each other, with one of them serving as a pouring spout and being opened. The pair of gable wall forming panels are continuously provided between the pair of gable roof forming panels. The pair of gable wall forming panels are folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel are heated and sealed at a predetermined position to form a top, and a gable roof type paper container is widely used.

[0003] Opening of such a gable roof type paper container is performed by inserting a finger into the space that opens between the pair of gable roof forming panels, the body panel, and the gable wall forming panel, placing a finger on the gable wall forming panel, and then spreading it left and right. By peeling off the opposing surfaces that are heat-sealed by the outer top seal panel and the inner top seal panel on the opening side, and pulling out the gable wall forming panel folded between the pair of gable roof forming panels, and folding it outward from the top horizontal fold line at the boundary with the body panel that is continuously provided via the top horizontal fold line to open the pouring spout. However, when the user's hand is large, when the paper container is small, or when the height of the top of the gable roof type is reduced for the purpose of saving space, etc., the space formed between the body panel and the gable wall forming panel is narrow, so it is difficult to place a finger on the gable wall forming panel, and there is a problem that the opening operation cannot be easily performed.

[0004] In recent years, a gable-roof type paper container has been known that solves these problems. This container features a gable-wall forming panel that is pulled out when the paper container is opened, and a body panel connected to the gable-wall forming panel. In this container, an auxiliary fold line is provided near the top horizontal fold line located at the boundary with the gable-wall forming panel, extending downward from one end of the top horizontal fold line to the other end of the body panel as it approaches the center (see, for example, Patent Document 1).

[0005] In a gable-roof type paper container with such auxiliary fold lines, when the top corner of the body formed by the top horizontal fold line is pushed inward into the container, the top corner folds inward along the auxiliary fold line, causing the upper part of the body panel sandwiched between the top horizontal fold line and the opening auxiliary crease to recess inward into the container. This widens the space for inserting fingers when placing them on the gable wall forming panel during opening, making it easier to open the paper container. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2002-234524 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] As described above, when opening the paper container described in Patent Document 1, the top corner of the body formed by the top horizontal fold line is pushed inward into the container, folding the top corner inward. However, the top corner has high bending strength to begin with, and since it is pushed from the convex side to the concave side, it is not easy to fold the top corner inward into the container. In particular, if the width of the body panel is short, it is difficult to push in, requiring a large force to push in the top corner, and there is a problem in that it is difficult to fold the top corner inward into the container.

[0008] The object of the present invention is to provide a paper container in which, when opened, the top corner of the body formed by the top horizontal fold line can be pushed inward with relatively little force, allowing the top corner to be easily folded inward into the paper container, and furthermore, the action of folding the top corner inward into the paper container and the action of spreading the end wall forming panels to the left and right can be easily performed in a series of actions. [Means for solving the problem]

[0009] To achieve the above objective, the invention described in claim 1 is made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, and comprises four body panels, the edges of which are joined by vertical seal panels to form a square body, and at the upper end of the body panels, a pair of gable roof forming panels facing each other and having an outer top seal panel on top, and a pair of gable wall forming panels facing each other and having an inner top seal panel on top, with one of them being an opening that serves as a spout, are connected via a top horizontal fold line, the pair of gable wall forming panels are folded between the pair of gable roof forming panels by valley folding along a folding line, and the outer top seal panel and the inner top seal panel are heated at a predetermined position In a gable-roof type paper container in which the top is formed by sealing and sealing, and a bottom-forming panel and an inner panel are connected to the lower end of the body panel via a bottom horizontal fold line, and the bottom is formed by folding the inner panel inside the bottom-forming panel, two auxiliary fold lines that straddle the top horizontal fold line are located on an imaginary line connecting the vertex of the roughly triangular surface of the gable-forming panel, the ends of the left and right body vertical fold lines of the body panel, and the left and right ends of the bottom horizontal fold line, and are formed along this imaginary line.

[0010] According to the invention described in claim 1, since the substantially triangular surface portion enclosed by the folding line and the top horizontal fold line in the gable wall forming panel on the opening side, and the body panel on the opening side connected to the gable wall forming panel, have two auxiliary fold lines that straddle the top horizontal fold line, the force when the top corner of the body formed by the top horizontal fold line is pressed is equally distributed at the intersection of the top horizontal fold line that forms the top corner formed by the top horizontal fold line and the two auxiliary fold lines that straddle the top horizontal fold line, thus reducing the bending strength of the top corner. Furthermore, the two auxiliary fold lines are located on a virtual line connecting the vertex of the roughly triangular face of the gable wall forming panel, the ends of the left and right vertical fold lines of the body panel, and the left and right ends of the bottom horizontal fold line, and are formed along this virtual line. Therefore, when the top corner is pressed in, the roughly triangular face and the body panel easily fold along the two auxiliary fold lines, inducing the top corner to fold inward into the paper container. Thus, the top corner can be folded inward into the paper container with relatively little force.

[0011] Furthermore, the two auxiliary fold lines are located on a virtual line connecting the vertex of the roughly triangular face of the gable wall forming panel, the ends of the left and right vertical fold lines of the body panel, and the left and right ends of the bottom horizontal fold line, and are formed along this virtual line. Therefore, when opening the package, if you simultaneously insert the fingers of both hands into the space that opens between the gable roof forming panel, the body panel, and the gable wall forming panel, the insides of your fingers will press against the top horizontal fold line, causing the top corner to fold inward into the paper container and widening the space. Continuing to insert your fingers in this manner will allow you to hook your fingers onto the left and right outer surfaces of the roughly triangular shape of the gable wall forming panel, enabling you to perform the folding of the top corner and the widening of the gable wall forming panel in a single, continuous motion.

[0012] At this time, the two auxiliary fold lines are located on a virtual line connecting the vertex of the substantially triangular face of the end wall forming panel and the intersection points of the left and right vertical fold lines of the body panel and the left and right ends of the bottom horizontal fold line. Therefore, when the fingers of both hands are placed in the space, the fingers rest on the two auxiliary fold lines, allowing the substantially triangular face and the body panel to easily valley fold from the two auxiliary fold lines, and the top corners to be easily folded inward into the paper container.

[0013] The invention described in claim 2 is characterized in that, as described in claim 1, the position in the height direction of the upper end of the substantially triangular face portion of the gable wall forming panel is at a height of 3 / 5 or more of the height from the top horizontal fold line that vertically connects the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line, and the position in the height direction of the lower end of the auxiliary fold line on the body panel is at a height range of 1 / 4 to 1 / 2 of the height from the top horizontal fold line that vertically connects the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line.

[0014] According to the invention described in claim 2, the auxiliary fold line is such that the position of the upper end of the substantially triangular face portion of the gable wall forming panel in the height direction is at least 3 / 5 of the height of the vertical line connecting the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line, so that when the top corner is pressed, the substantially triangular face portion and the body panel fold more easily from the two auxiliary fold lines, effectively inducing the top corner to fold inward into the paper container, and the top corner can be folded inward into the paper container with less force.

[0015] Furthermore, since the position in the height direction of the lower end of the auxiliary fold line on the body panel is located in a range of 1 / 4 to 1 / 2 of the height from the top horizontal fold line to the point where the vertex of the substantially triangular face of the gable wall forming panel is connected to the top horizontal fold line, if the position in the height direction of the lower end of the auxiliary fold line is at a position of 1 / 4 or more of the height from the top horizontal fold line to the point where the vertex of the substantially triangular face of the gable wall forming panel is connected to the top horizontal fold line, the space opening between the pair of gable roof forming panels, the body panel and the gable wall forming panel can be made large enough to insert a finger.

[0016] Furthermore, when the gable wall forming panel, which is folded between the pair of gable roof forming panels, is pulled out, the substantially triangular surface portion of the gable wall forming panel and the body panel fold in a mountain fold along the two auxiliary fold lines, and at the same time, the body panel buckles and folds in a valley fold along the imaginary line connecting the lower ends of the two auxiliary fold lines. As a result, the spout formed by pulling out the gable wall forming panel protrudes to the outside of the paper container, making it easy to pour out the liquid contents from the spout.

[0017] Furthermore, if the height of the lower end of the auxiliary fold line is at a height of 1 / 2 or less of the height between the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line, when the gable wall forming panel folded between the pair of gable roof forming panels is pulled out, the body panel, due to the portion of the body panel that is folded in the valley direction from the imaginary line connecting the lower ends of the two auxiliary fold lines, effectively suppresses the return of the substantially triangular face portion that protrudes from the auxiliary fold line and the body panel in the valley-fold direction, thus maintaining the shape of the open spout. [Effects of the Invention]

[0018] As described above, according to the paper container of the present invention, when opening, the top corner of the barrel part formed by the top horizontal fold line can be pushed into the inside of the container with a relatively small force, and the top corner can be easily bent inward of the paper container. Furthermore, the operation of bending the top corner inward of the paper container and the operation of spreading the wife wall forming panel to the left and right can be easily performed in a series of operations.

Brief Description of the Drawings

[0019] [Figure 1] It is a side view on the opening side showing an example of an embodiment of the paper container according to the present invention. [Figure 2] It is a plan view showing the carton blanks of the paper container shown in FIG. 1. [Figure 3] It is a partially enlarged explanatory view of FIG. 2. [Figure 4] It is an enlarged side explanatory view showing the state where the top corner of the paper container shown in FIG. 1 is pushed in. [Figure 5] It is an enlarged side explanatory view on the opening side showing the state where the wife wall forming panel of the paper container shown in FIG. 1 is pulled out in the direction away from the gable roof forming panel and the pouring spout is opened.

Embodiments for Carrying out the Invention

[0020] Hereinafter, embodiments for carrying out the paper container according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show an example of an embodiment of the paper container according to the present invention. FIG. 1 is a side view on the opening side of the paper container of this example, FIG. 2 is a plan view showing the carton blanks of the paper container shown in FIG. 1, FIG. 3 is a partially enlarged explanatory view of FIG. 2, FIG. 4 is an enlarged side explanatory view showing the state where the top corner of the paper container shown in FIG. 1 is pushed in, and FIG. 5 is an enlarged side explanatory view on the opening side showing the state where the wife wall forming panel of the paper container shown in FIG. 1 is pulled out in the direction away from the gable roof forming panel and the pouring spout is opened.

[0021] The paper container 1 in this example is formed from a carton blank 2 which is a paperboard material with a thermoplastic resin laminated on the front and back surfaces shown in Fig. 2. The carton blank has four body panels 6, 7, 8, 9 which are connected in series via body longitudinal fold lines 3, 4, 5. When forming the paper container 1, the four body panels 6, 7, 8, 9 are joined such that the longitudinal seal panel 11 which is connected to the body panel 9 via the body longitudinal fold line 10 and the edge 12 of the body panel 6 form the rectangular tubular body 13 of the paper container.

[0022] At the upper ends of the body panels 7, 9, there is a pair of gable roof forming panels 16, 17 which have outer top seal panels 14, 15 at the upper part and face each other, and are connected in series via top transverse fold lines 18, 19. Also, at the upper ends of the body panels 6, 8, there is a pair of gable wall forming panels 23, 24 which have inner top seal panels 20, 21 at the upper part and face each other, and one of them serves as the pouring outlet 22 and is opened, and are connected in series via top transverse fold lines 25, 26. In the first example, the gable wall forming panel 24 is the gable wall forming panel on the opening side.

[0023] On the gable roof forming panels 16, 17, guide fold lines 27, 28 for guiding the folding of the gable roof forming panels 16, 17 during opening are formed on the side of the gable wall forming panel 24 on the opening side. Also, on the gable roof forming panel 16, there is a straw pouring outlet 31 which is composed of a first half cut 29 which becomes a straw insertion port formed from the back surface side and a second half cut 30 formed from the front surface side so as to surround the first half cut 29.

[0024] On the gable wall forming panels 23, 24, folding fold lines 32, 33, 34, 35 for folding the gable wall forming panels 23, 24 are formed. Also, substantially triangular faces 36, 37 surrounded by the folding fold lines 32, 33, 34, 35 and the top transverse fold lines 25, 26 are formed.

[0025] During the formation of the paper container 1, the gable wall forming panels 23 and 24 are folded between the gable roof forming panels 16 and 17, and the outer top seal panels 14 and 15 and the inner top seal panels 20 and 21 are heated and sealed in predetermined positions to form a gable-shaped top 38 on the paper container 1.

[0026] Furthermore, bottom-forming panels 39 and 40 are connected to the lower ends of the body panels 6 and 8 via bottom horizontal fold lines 41 and 42, and inner panels 43 and 44 are connected to the lower ends of the body panels 7 and 9 via bottom horizontal fold lines 45 and 46, with the inner panels 43 and 44 folded inside the bottom-forming panels 39 and 40 to form the bottom 47.

[0027] Furthermore, in the gable wall forming panel 24 on the opening side, there is a roughly triangular surface area 37 enclosed by the folding lines 34, 35 and the top horizontal fold line 26, and in the body panel 8 on the opening side that is connected to the gable wall forming panel 24, there are two auxiliary fold lines 48, 49 that straddle the top horizontal fold line 26. These are located on imaginary lines L1, L2, which connect the vertex 50 of the roughly triangular surface area 37 of the gable wall forming panel 24 and the intersection points 51, 52 of the left and right body vertical fold lines 4, 5 and the left and right ends of the bottom horizontal fold line 42 of the body panel 8, and are formed along these imaginary lines L1, L2.

[0028] In this example, the auxiliary fold lines 48 and 49 are positioned such that the upper ends 53 and 54 of the roughly triangular face portion 37 are at a height of 3 / 5 or more of the height H that connects the vertex 50 of the roughly triangular face portion 37 and the vertex fold line 26 from the top horizontal fold line 26. Also, the lower ends 55 and 56 of the auxiliary fold lines 48 and 49 on the body panel 8 are positioned in a height range of 1 / 4 to 1 / 2 of the height H that connects the vertex 50 of the roughly triangular face portion 37 and the vertex fold line 26 from the top horizontal fold line 26 (see Figure 3).

[0029] As described above, with the paper container 1, two auxiliary fold lines 48 and 49 are formed on the roughly triangular surface portion 37 and the body panel 8, straddling the top horizontal fold line 26. Therefore, when the top corner portion 57 of the body portion 13 formed by the top horizontal fold line 26 is pressed, the force is equally distributed at the intersection of the top horizontal fold line 26 that forms the top corner portion 57 and the auxiliary fold lines 48 and 49 that straddle the top horizontal fold line 26, resulting in a lower bending strength of the top corner portion 57.

[0030] Furthermore, the auxiliary fold lines 48 and 49 are located on imaginary lines L1 and L2, which connect the vertex 50 of the roughly triangular face portion 37 and the intersection points 51 and 52 of the left and right vertical fold lines 4 and 5 of the body panel 8 and the left and right ends of the horizontal fold line 42 at the bottom. Since they are formed along these imaginary lines l and L2, when the top corner portion 57 is pressed in, the roughly triangular face portion 37 and the body panel 8 easily fold along the auxiliary fold lines 48 and 49, inducing the top corner portion 57 to fold inward into the paper container 1. Thus, the top corner portion 57 can be folded inward into the paper container 1 with relatively little force.

[0031] When the top corner 57 of the body panel 8 is folded, it buckles and forms a mountain fold along imaginary lines L3 connecting the lower ends 55 and 56 of the auxiliary fold lines 48 and 49, imaginary line L4 connecting the lower end 55 of the auxiliary fold line 48 and the intersection 58 between the end of the body vertical fold line 4 of the body panel 8 and the end of the top horizontal fold line 26, and imaginary line L5 connecting the lower end 56 of the auxiliary fold line 49 and the intersection 59 between the end of the body vertical fold line 5 of the body panel 8 and the end of the top horizontal fold line 26. This makes it easy to indent the roughly triangular surface 37 and the upper part of the body panel 8.

[0032] In this example, the height positions of the lower ends 55 and 56 of the auxiliary fold lines 48 and 49 on the body panel 8 are within a range of 1 / 4 to 1 / 2 of the height H that connects the vertex 50 of the roughly triangular face portion 37 and the top horizontal fold line 26 from the top horizontal fold line 26. Therefore, if the height positions of the lower ends 55 and 56 of the auxiliary fold lines 48 and 49 are at a position of 1 / 4 or more of the height H that connects the vertex 50 of the roughly triangular face portion 37 and the top horizontal fold line 26 from the top horizontal fold line 26, the top corner portion 57 can be folded to create a recess in the roughly triangular face portion 37 and the upper part of the body panel 8, thereby creating a space 58 that opens between the gable roof forming panels 16 and 17, the body panel 8 and the gable wall forming panel 24 that is large enough to insert a finger (see Figure 4).

[0033] Furthermore, when the gable wall forming panel 24, which is folded between the gable roof forming panels 16 and 17, is pulled out, the roughly triangular face portion 37 and the body panel 8 are folded in a mountain fold along the auxiliary fold lines 48 and 49. At the same time, the body panel buckles and folds in a valley fold along the imaginary line L3 connecting the lower ends 55 and 56 of the auxiliary fold lines 48 and 49, the imaginary line L4 connecting the lower end 55 of the auxiliary fold line 48 and the intersection 58 between the end of the body vertical fold line 4 and the end of the top horizontal fold line 26 of the body panel 8, and the imaginary line L5 connecting the lower end 56 of the auxiliary fold line 49 and the intersection 59 between the end of the body vertical fold line 5 and the end of the top horizontal fold line 26 of the body panel 8. As a result, the spout 22 formed by pulling out the gable wall forming panel 24 protrudes to the outside of the paper container 1, making it easy to pour out the liquid contents from the spout 22 (see Figure 5).

[0034] Furthermore, if the height of the lower ends of the auxiliary fold lines 48 and 49 is at a height of 1 / 2 or less of the height H of the vertical line connecting the vertex 50 of the approximately triangular face portion 37 and the top horizontal fold line 26 from the top horizontal fold line 26, when the gable wall forming panel 24 folded between the gable roof forming panels 16 and 17 is pulled out, the body panel 8 is effectively prevented from returning in the direction of the valley fold by the portion of the body panel 8 that is folded in the valley direction from the imaginary line L3 connecting the lower ends of the auxiliary fold lines 48 and 49, thereby maintaining the shape of the open spout.

[0035] Furthermore, auxiliary fold lines 48 and 49 are located on imaginary lines L1 and L2, which connect the vertices 50 of the roughly triangular face portion 37 and the intersection points 51 and 52 of the left and right vertical fold lines 4 and 5 of the body panel 8 and the left and right ends of the horizontal fold line 42 at the bottom. Since the auxiliary fold lines 48 and 49 are formed along these imaginary lines L1 and L2, when opening the container, inserting the fingers of both hands simultaneously into the space 58 that opens between the gable roof forming panels 16 and 17, the body panel 8, and the gable wall forming panel 24 will cause the insides of the fingers of both hands to press against the top horizontal fold line 26, causing the top corner 57 to fold inward into the paper container 1 and widening the space 58. By continuing to insert the fingers in this manner, it becomes possible to hook the fingers onto the left and right outer surfaces of the roughly triangular 37 in the gable wall forming panel 24, allowing the folding of the top corner 57 and the widening of the gable wall forming panel 24 to be performed in a single, continuous motion.

[0036] At this time, the auxiliary fold lines 48 and 49 are located on imaginary lines L1 and L2 that connect the vertex 5 of the roughly triangular face portion 37 and the intersection points 51 and 52 of the left and right vertical fold lines 4 and 5 of the body panel 8 and the left and right ends of the horizontal fold line 42 at the bottom. Therefore, when the fingers of both hands are placed in the space 58, the fingers rest on the auxiliary fold lines 48 and 49, so the roughly triangular face portion 37 and the body panel 8 can be easily folded from the auxiliary fold lines 48 and 49, and the top corner portion 57 can be easily folded inward into the paper container 1. [Explanation of symbols]

[0037] 1 paper container 2 carton blanks 3,4,5 Vertical fold lines on the torso 6,7,8,9 Body panels 10. Vertical fold lines on the torso 11 Vertical sealing panel 12 Edge 13 Torso 14,15 Outer top seal panel 16,17 Gable roof forming panels 18,19 Top horizontal fold line 20,21 Inner top seal panel 22 spout 23,24 End wall forming panel 25,26 Top horizontal fold line 27,28 Guide lines 29 First half cut 30 Second Half Cut 31. Spout for straw 32, 33, 34, 35 Folding lines 36,37 Almost triangular surface part 38 Top 39,40 Bottom forming panel 41,42 Bottom transverse fold line 43,44 Inner panel 45,46 Bottom transverse fold line 47 Bottom 48,49 Auxiliary fold line 50 vertices 51,52 intersection 53,54 Upper end 55,56 Lower end 57 Top corner 58 Space L1, L2, L3, L4, L5 virtual lines H Height

Claims

1. In a gable-roof type paper container, the container is made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, and comprises four body panels, the edges of which are joined by vertical sealing panels to form a square body, and at the upper end of the body panels, a pair of gable roof forming panels facing each other and having an outer top sealing panel on top, and a pair of gable wall forming panels facing each other and having an inner top sealing panel on top, with one of them serving as a spout for opening, are connected via a top horizontal fold line, the pair of gable wall forming panels are folded between the pair of gable roof forming panels by valley folding along a folding line, the top is formed when the outer top sealing panel and the inner top sealing panel are heated and sealed at a predetermined position, and at the lower end of the body panels, a bottom forming panel and an inner panel are connected via a bottom horizontal fold line, and the bottom is formed when the inner panel is folded inside the bottom forming panel. A paper container characterized in that, in the gable-forming panel on the opening side, there is a substantially triangular surface enclosed by the folding line and the top horizontal fold line, and in the body panel on the opening side connected to the gable-forming panel, there are two auxiliary fold lines that straddle the top horizontal fold line, located on an imaginary line connecting the vertex of the substantially triangular surface of the gable-forming panel, the ends of the left and right body vertical fold lines of the body panel, and the left and right ends of the bottom horizontal fold line, and formed along this imaginary line.

2. The paper container according to claim 1, characterized in that the position of the upper end of the substantially triangular face portion of the gable wall forming panel in the height direction is at least 3 / 5 of the height from the top horizontal fold line that connects the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line perpendicularly, and the position of the lower end of the auxiliary fold line in the body panel in the height direction is in a range of at least 1 / 4 and at least 1 / 2 of the height from the top horizontal fold line that connects the vertex of the substantially triangular face portion of the gable wall forming panel and the top horizontal fold line perpendicularly.

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