Liquid paper container

Abstract

To provide a liquid paper container that allows dispensing of viscous liquid contents even when only a small amount remains. [Solution] A gable-top type liquid paper container having a main body 2 formed from a laminate of a paper layer 32, a barrier film 36, and a heat-adhesive resin layer 39, and a dispensing member 4 for dispensing contents, wherein the main body 2 has a cylindrical body 5, a bottom portion 6 that closes the bottom of the body 5, and a top portion 7 that closes the top of the body 5. At least a part of the outer edge of a separation portion 50, which has a first separation portion 51 formed on the second side plates 222, 224 of the body 5 and a second separation portion 52 formed on the ceiling side plates 232, 234 of the top portion 7 and connected to the first separation portion 51, is connected to the main body 2 via a planned cutting line 53.

Description

Technical Field

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

Background Art

[0002] Conventional liquid paper containers for containing viscous liquids such as dressings and shampoos are disclosed in Patent Document 1. This liquid paper container is formed in a gable top type by a laminate in which a paper layer, an intermediate layer, and a thermally adhesive resin layer are laminated, and a pouring member is provided on an inclined roof portion disposed above a cylindrical body portion. Notch portions where only the paper layer is cut out are formed at both side ends of one side plate constituting the body portion, and a fold line connecting both notch portions is provided. By holding the body portion with one hand and repeatedly pressing on the fold line with a finger, the content of the viscous liquid can be forcibly discharged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, according to the above conventional liquid paper container, there is a problem that when the content remains small, the content cannot be discharged even by pressing the fold line between the notch portions.

[0005] An object of the present invention is to provide a liquid paper container capable of pouring out the content of a viscous liquid even when the content remains small.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a gable-top type liquid paper container having a main body formed from a laminate of a paper layer, a barrier film, and a heat-adhesive resin layer, and a dispensing member for dispensing the contents. The main body has a cylindrical body having a pair of first side panels and a pair of second side panels arranged opposite to each other, a bottom portion that closes the bottom of the body, a top portion that closes the top of the body and has a pair of inclined plates that are connected to the upper ends of the pair of first side panels, are inclined and opposite to each other and their upper ends are bonded to each other, and a pair of ceiling side panels that are connected to the upper ends of the pair of second side panels and connect the pair of inclined plates. The main body is provided with a separation portion in which the adhesive strength between the paper layer and the barrier film is lower than that of other parts of the main body, and the paper layer is formed to be separable from the barrier film. The separation portion has a first separation portion formed on the second side panel and a second separation portion formed on the ceiling side panel connected to the second side panel and connected to the first separation portion. At least a portion of the outer edge of the separation section is connected to the main body via a planned cutting line. [Effects of the Invention]

[0007] According to the present invention, by removing the separation portion formed across the second side panel and the ceiling side panel, the ridge line between the second side panel and the ceiling side panel is removed. This allows the liquid paper container to be easily folded, and the contents of the remaining viscous liquid can be poured out to the very last drop. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the liquid paper container of the first embodiment, viewed from the front. [Figure 2] Figure 2 is a plan view of the blank plate with the main body of the liquid paper container unfolded. [Figure 3] Figure 3 is a cross-sectional view showing the layer structure of the blank plate. [Figure 4] Figure 4 is an enlarged view of the separation section. [Figure 5] Figure 5 is a side view of the liquid paper container showing the separated section. [Figure 6] Figure 6 is a perspective view of the liquid paper container with the separation section removed, seen from the front. [Figure 7] Figure 7 is a side view of the liquid paper container in its initial folded state with the second side panel pressed down. [Figure 8] Figure 8 is a side view of the liquid paper container in a further folded state. [Figure 9] Figure 9 is a perspective view of a liquid paper container according to the second embodiment. [Figure 10] Figure 10 is a schematic diagram of the separation section of a liquid paper container according to the second embodiment. [Figure 11] Figure 11 is a perspective view of a liquid paper container according to the third embodiment. [Figure 12] Figure 12 is a side view of the liquid paper container in its initial folded state with the second side panel pressed down. [Figure 13] Figure 13 is a side view of the liquid paper container in a further folded state. [Figure 14] Figure 14 is a perspective view of a liquid paper container according to the fourth embodiment. [Modes for carrying out the invention]

[0009] <First Embodiment> Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a perspective view of the liquid paper container 1 of the first embodiment, viewed from the front. Figure 2 is a plan view of the blank plate 20 when the main body 2 of the liquid paper container 1 is unfolded. Figure 3 is a cross-sectional view showing the layer structure of the blank plate 20. The liquid paper container 1 contains viscous liquid contents such as seasonings (dressings, ketchup, mayonnaise, etc.) and hygiene products (shampoo, conditioner, body soap, etc.).

[0010] The liquid paper container 1 comprises a main body 2 and a dispensing member 4. The main body 2 is formed into a gable-top shape by folding and fixing (for example, by heat bonding) a blank plate 20 (see Figure 2) having a paper layer 32 and a barrier film 36 (see Figure 3). The main body 2 has a body portion 5, a bottom portion 6, and a top portion 7.

[0011] As shown in FIG. 1, FIG. 5, etc., the bottom surface portion 6 closes the bottom surface of the cylindrical body portion 5. Further, the top surface portion 7 closes the top surface of the cylindrical body portion 5. A separating portion 50, the details of which will be described later, is provided on the body portion 5 and the top surface portion 7.

[0012] The pouring member 4 is, for example, made of a resin molded product and is attached to one inclined plate 233 that forms the top surface portion 7. The pouring member 4 is arranged on the front side of the liquid paper container 1. The pouring member 4 is opened and closed by a cap 41 and forms a pouring outlet for the content accommodated inside the liquid paper container 1.

[0013] As shown in FIG. 2, a folding line 21 shown by a broken line in FIG. 2 is provided at a predetermined position on the blank plate 20. On the blank plate 20, rectangular first side plates 221, 223 that form the body portion 5, second side plates 222, 224, and an adhesive margin piece 25 are provided. On the blank plate 20, the first side plate 221, the second side plate 222, the first side plate 223, the second side plate 224, and the adhesive margin piece 25 are sequentially connected in one direction via the folding line 21. One end of the first side plate 221 on the back side and the first side plate 223 on the front side are connected by the second side plate 222, and the other end is connected by the second side plate 224. The second side plates 222, 224 are adjacent to both sides of the first side plate 221 on the back side and both sides of the first side plate 223 on the front side.

[0014] An inclined plate 231 is continuously provided at the upper end of the first side plate 221 on the back side. Also, a bottom plate 241 is continuously provided at the lower end of the first side plate 221. An upper ceiling side plate 232 is continuously provided at the upper end of the second side plate 222. Also, a bottom plate 242 is continuously provided at the lower end of the second side plate 222. An inclined plate 233 is continuously provided at the upper end of the first side plate 223 on the front side. A bottom plate 243 is continuously provided at the lower end of the first side plate 223. An insertion hole 8 for attaching the pouring member 4 (see FIG. 1) is provided in the inclined plate 233. An upper ceiling side plate 234 is continuously provided at the upper end of the second side plate 224, and a bottom plate 244 is continuously provided at the lower end. The adhesive margin piece 25 is provided adjacent to the second side plate 224, the upper ceiling side plate 234, and the bottom plate 244.

[0015] The blank plate 20 is formed into a cylindrical shape by being bent along the fold line 21 and heat-bonded with the paste margin piece 25. That is, the paste margin piece 25 adjacent to the second side plate 224 at one end is heat-bonded to the first side plate 221 at the other end, thereby forming a cylindrical body portion 5 (see FIG. 1) in a circumferentially closed state.

[0016] Similarly, when the paste margin piece 25 is heat-bonded to the inclined plate 231, the top surface portion 7 (see FIG. 1) is formed in a state where the upper end is open and closed in the circumferential direction. Also, when the paste margin piece 25 is heat-bonded to the bottom plate 241, the bottom surface portion 6 (see FIG. 6) is formed in a state where the lower end is open and closed in the circumferential direction.

[0017] The bottom surface portion 6 is formed by folding each of the bottom plates 241 to 244 along the fold line 21 and fixed in a state of closing the bottom surface of the body portion 5 by heat bonding.

[0018] The pouring member 4 inserted into the insertion hole 8 is heat-bonded around the insertion hole 8 on the inclined plate 233 of the top surface portion 7. After filling the contents, the inclined plate 231, the ceiling side plate 232, the inclined plate 233, and the ceiling side plate 234 are bent along the fold line 21. Then, the upper portions of the ceiling side plates 232 and 234 are folded back onto the inner surfaces of the inclined plates 231 and 233 and heat-bonded. Also, the upper ends of the inclined plates 231 and 233 are heat-bonded. As a result, on the top surface portion 7, an inclined roof portion is formed where a pair of opposing inclined plates 231 and 233 are inclined. The inclined plates 231 and 233 are fixed in a state of closing the top surface of the body portion 5. The top surface portion 7 is formed into a so-called gable top type.

[0019] As shown in FIG. 2, a separation portion 50 separable from the liquid paper container 1 is provided at a predetermined position of the blank plate 20, specifically, at a position connecting the central portion in the width direction at the upper ends of the second side plates 222 and 224 and the central portion in the width direction at the lower ends of the ceiling side plates 232 and 234. The separation portion 50 is separated from the main body portion 2 when the liquid paper container 1 is folded as will be described later.

[0020] As shown in Figure 3, the blank plate 20 is formed by laminating the following layers in order from the outer surface: a heat-adhesive resin layer 31, a paper layer 32, an intermediate resin layer 33, an adhesive layer 34, a peel-off coat layer 35, a barrier film 36, an adhesive layer 38, and a heat-adhesive resin layer 39.

[0021] The paper layer 32 has a basis weight of, for example, 130-450 g / m². 2 It is formed from cardboard. The strength of the blank board 20 is mainly maintained by the paper layer 32. The heat-adhesive resin layer 31 is formed from a thermoplastic resin and is placed on the outer surface of the paper layer 32. The heat-adhesive resin layer 31 is formed from, for example, low-density polyethylene (LDPE), polyethylene (PE), etc., with a thickness of 15 to 35 μm. The outer surface of the heat-adhesive resin layer 31 is corona treated, and a printed layer (not shown) is formed at a predetermined position by gravure printing or offset printing.

[0022] The intermediate resin layer 33 is formed from, for example, low-density polyethylene (LDPE), polyethylene (PE), etc., with a thickness of 15 to 35 μm, and is coated onto the paper layer 32. The intermediate resin layer 33 allows water vapor generated from the paper layer 32 during heat bonding when assembling the liquid paper container 1 to escape, preventing foaming due to water vapor. Coated paper is formed by resin coating on both sides of the paper layer 32 using the heat-adhesive resin layer 31 and the intermediate resin layer 33. If foaming is within an acceptable range, the intermediate resin layer 33 may be omitted, and coated paper may be made by resin coating only one side of the paper layer 32.

[0023] The adhesive layer 34 is made of a thermoplastic resin, for example, an ethylene-acrylic acid resin (EAA), an ethylene-methacrylic acid copolymer resin (EMAA), etc., with a thickness of 15 to 35 μm. The adhesive layer 34 adheres the coated paper to the laminated film on the inner side. The adhesive layer 34 may be formed of a dry laminating adhesive, a wet laminating adhesive, etc.

[0024] The barrier film 36 comprises a gas barrier layer 361 and a barrier substrate layer 362. The gas barrier layer 361 is, for example, a vapor-deposited film deposited on one surface of the barrier substrate layer 362. The barrier substrate layer 362 is formed from, for example, a polyethylene terephthalate (PET) film, a nylon film, or the like with a thickness of 9 to 25 μm.

[0025] The gas barrier layer 361 is formed from a metal vapor-deposited film (such as an aluminum vapor-deposited film) or an inorganic oxide vapor-deposited film (such as a silica vapor-deposited film or an alumina vapor-deposited film). The gas barrier layer 361 has gas barrier properties and prevents oxygen, water vapor, etc. from entering the liquid paper container 1.

[0026] The gas barrier layer 361 is positioned on the outer side of the barrier substrate layer 362 and is adjacent to the adhesive layer 34. Ethylene-acrylic acid resin and ethylene-methacrylic acid copolymer resin have excellent adhesion to metals and oxides. Therefore, the adhesive layer 34 can reliably bond the coated paper and the barrier film 36.

[0027] The adhesive layer 38 is formed from low-density polyethylene (LDPE) or the like with a thickness of 15 to 35 μm and adheres the film forming the heat-adhesive resin layer 39 to the barrier film 36. The heat-adhesive resin layer 39 is made of a thermoplastic resin and is formed from a film such as linear low-density polyethylene (LLDPE) or ethylene-α-olefin copolymer with a thickness of 15 to 60 μm.

[0028] Furthermore, the separation section 50 is composed of a heat-adhesive resin layer 31, a paper layer 32, and an intermediate resin layer 33, and is configured to be separable from the barrier film 36. A peel-off coat layer 35 is placed between the separation section 50 and the barrier film 36.

[0029] The peel-off coat layer 35 is formed from, for example, silicon with a thickness of 0.1 μm to 3 μm. The adhesive strength between the intermediate resin layer 33 and the barrier film 36 due to the peel-off coat layer 35 is weaker than the adhesive strength due to the adhesive layer 34.

[0030] As a result, by pulling the separation section 50 to the outside of the liquid paper container 1, only the separation section 50 is separated from the liquid paper container 1, leaving the rest of the container intact, and the removal hole 29 is formed (see Figures 5 and 6). The outer edge of the peel-off coat layer 35 is formed to be outside the planned cutting line 53 of the separation section 50, which will be described later.

[0031] By forming the peel-off coat layer 35 larger than the area where the separation section 50 is formed, the entire separation section 50 can be brought into contact with the peel-off coat layer 35 even if the planned cutting line 53 deviates from its designated position. This allows the separation section 50 to be easily separated from the liquid paper container 1.

[0032] Furthermore, the entire separation section 50 may not be bonded to the barrier film 36 via the adhesive layer 34. In this case, the portion where the adhesive layer 34 is not formed may be configured in the area overlapping with the separation section 50, and the peel-off coat layer 35 may be omitted. The portion where the adhesive layer 34 is not formed may be larger than the portion overlapping with the separation section 50. In this way, even if the separation section 50 shifts or the adhesive layer 34 protrudes, it is possible to prevent the separation section 50 from being bonded to the barrier film 36 by the adhesive layer 34. As a result, the separation section 50 can be easily separated from the main body 2.

[0033] Furthermore, the peel-off coat layer 35 may be formed such that only the peripheral edge of the separation section 50 adheres to the barrier film 36 via the peel-off coat layer 35. In this case, the peel-off coat layer 35 can be annular in shape with a constant width along the planned cutting line 53 of the separation section. With this configuration, the peripheral edge of the separation section 50 is held in contact with the peel-off coat layer 35, making it difficult for the separation section 50 to peel off. This makes it easier to maintain the rigidity of the liquid paper container 1 and also enhances its design.

[0034] The blank plate 20 with the above configuration is folded along the fold line 21, and opposing heat-adhesive resin layers 39, opposing heat-adhesive resin layers 31, and opposing heat-adhesive resin layers 39 and heat-adhesive resin layer 31 are heat-bonded to each other at predetermined locations, thereby forming the liquid paper container 1.

[0035] In the liquid paper container 1, the body 5 is cylindrical with a square cross-section. All four sides of the lower end of the body 5 are connected to the bottom surface 6, and all four sides of the upper end are connected to the top surface 7. This increases the rigidity of the body 5. In other words, the body 5 is less prone to deformation. That is, when the separation section 50 is not separated, the rigidity of the second side panels 222 and 224 is maintained by the ridge section 28 formed by bending the ceiling side panels 232 and 234 inward.

[0036] As a result, the rigidity of the liquid paper container 1 can be maintained, preventing deformation due to insufficient rigidity when filling with contents, and enabling stable filling of contents. Furthermore, deformation due to insufficient rigidity can also be suppressed when transporting the liquid paper container 1 filled with contents, eliminating the need for special tools or operations for transporting the liquid paper container 1 and improving convenience for workers.

[0037] <Separation section 50> Figure 4 is an enlarged view of the separation section 50. As shown in Figures 1 and 2, the liquid paper container 1 has a pair of separation sections 50 formed in the main body 2. The separation sections 50 can be separated from the main body 2 by the user as needed (see Figure 5).

[0038] As shown in Figures 1, 2, and 4, the separation section 50 has a first separation section 51 and a second separation section 52. The first separation section 51 is positioned at the upper end of the second side plates 222 and 224. The first separation section 51 has a shape that widens laterally as it goes upward, and its lower end is curved (in this case, an arc).

[0039] A gripping portion 511 is provided at the lower end of the first separation portion 51. The gripping portion 511 is not adhered to the barrier film 36, while the portion of the first separation portion 51 other than the gripping portion 511 is adhered to the barrier film 36 via the peel-off coat layer 35. As described above, in the case where the peel-off coat layer 35 is omitted, the entire first separation portion 51 is not adhered to the barrier film 36. Furthermore, even in the case where only the outer edge of the separation portion 50 is adhered via the peel-off coat layer 35, the outer edge of the gripping portion 511 may be configured so as not to come into contact with the peel-off coat layer 35. With this configuration, the gripping portion 511 can be easily lifted from the second side plates 222 and 224, making it easier to separate the separation portion 50 from the liquid paper container 1.

[0040] The second separation section 52 is positioned on the ceiling side panels 232 and 234. The second separation section 52 is approximately semicircular in shape. In the blank plate 20, the first separation section 51 and the second separation section 52 are connected via the first fold line 211. When the blank plate 20 is folded to form the liquid paper container 1, a ridge line 28 is formed when it is folded along the first fold line 211. In other words, in the liquid paper container 1, the first separation section 51 and the second separation section 52 are connected via the ridge line 28. The second separation section 52, like the first separation section 51, is bonded to the barrier film 36 via the peel-off coat layer 35. As described above, it is also possible to configure the second separation section 52 so that only the outer edge is bonded via the peel-off coat layer 35.

[0041] Cutting lines 53 are provided around the first separation section 51 and the second separation section 52. The cutting lines 53 constitute the edges of the removal holes 29 formed in the main body section 2 after the separation section 50 is removed from the liquid paper container 1. The cutting lines 53 are configured such as perforations or half-cut lines so that the separation section 50 can be cut from the second side panels 222, 224 and the top side panels 232, 234 by pulling the gripping section 511.

[0042] In this embodiment, the planned cutting line 53 of the separation section 50 is formed by perforations. The planned cutting line 53 has a shape in which cuts 531 are formed in a row. Guide lines 532 are provided at the end of the cuts 531 on the gripping section 511 side. The guide lines 532 adjacent to the first separation section 51 are inclined inward towards the separation section 50. The guide lines 532 adjacent to the second separation section 52 are inclined outward towards the separation section 50.

[0043] The separating section 50 pulls up the gripping section 511, which is provided at the lower end, relative to the second side plates 222 and 224, thereby forming a crack in the notch 531 that reaches the guide line 532 from the end opposite the gripping section 511. As a result, the notches 531 of the planned cutting line 53 are connected by the crack, and the notches 531 are linked together. In this way, the separating section 50 is accurately cut along the planned cutting line 53.

[0044] Furthermore, if the spacing between the cuts 531 is narrow and the crack propagates straight toward the next cut 531, the guide line 532 may be omitted. In addition, in the state before separating the separation section 50, it is preferable that the portion between the cuts 531 has a certain length or longer in order to ensure the strength of the second side panels 222, 224 and the ceiling side panels 232, 234. Also, if the planned cutting line 53 is formed by a half-cut line, the entire planned cutting line 53 is made of a half-cut line and the guide line is omitted.

[0045] <Folding of liquid paper container 1> The folding of the liquid paper container 1 will be described below with reference to the drawings. Figure 5 is a side view of the liquid paper container 1 showing the separation section 50 separated. Figure 6 is a perspective view of the liquid paper container 1 with the separation section 50 separated, viewed from the front. Figure 7 is a side view of the liquid paper container 1 in its initial folding state with the second side plates 222 and 224 pressed down. Figure 8 is a side view of the liquid paper container 1 in a further folded state.

[0046] In the liquid paper container 1, the contents of the viscous liquid can be dispensed by removing the cap 41 of the dispensing member 4 and tilting the liquid paper container 1 so that the dispensing member 4 is below the top surface of the contents. Because the contents are a viscous liquid, as the amount of contents decreases, it becomes difficult to dispense the contents even when the liquid paper container 1 is tilted. Therefore, for example, one could consider folding the liquid paper container 1 to squeeze out the contents of the viscous liquid.

[0047] In the liquid paper container 1, the ridge portion 28 provided at the upper ends of the second side plates 222 and 224 increases the rigidity of the body portion 5, making it difficult to indent the central part of the second side plates 222 and 224 in the width direction. Therefore, in the liquid paper container 1 of this embodiment, as shown in Figure 5, the separation portion 50 is removed when folded. As described above, the separation portion 50 is separated from the liquid paper container 1 by gripping the grip portion 511 and pulling it outwards along the planned cutting line 53.

[0048] When the separation section 50 is removed, a removal hole 29 is formed that spans the second side panels 222, 224 and the top side panels 232, 234 of the liquid paper container 1. As a result, the middle portion of the ridge section 28 that maintained the rigidity of the upper ends of the second side panels 222, 224 is removed (see Figures 5 and 6), and the rigidity of the upper ends of the second side panels 222, 224 is reduced. When the separation section 50 is separated, it is preferable, but not limited to, that about half of the total length of the ridge section 28 is removed. It is sufficient that the rigidity is reduced so that the central part in the width direction of the second side panels 222, 224 can be recessed inward when the ridge section 28 is removed.

[0049] In this state, when the center of the second side panels 222 and 224 in the width direction is pressed, the center of the second side panels 222 and 224 in the width direction is recessed inward. Furthermore, as the second side panels 222 and 224 are recessed, the ceiling side panels 232 and 234 are also recessed. As a result, the first side panels 221 and 223 and the inclined panels 231 and 233 move closer together (see Figure 7).

[0050] Furthermore, when the liquid paper container 1 is compressed in the front-to-back direction, the lower parts of the second side plates 222 and 224 are deformed so that they overlap the bottom surface 6. Subsequently, by pressing the rear side of the bottom surface 6 upward, the rear first side plate 221 is folded upward. The first side plate 221 is curved, but is not limited to this. As a result, the first side plates 221 and 223 and the inclined plates 231 and 233 move closer together, and the liquid paper container 1 is folded (see Figure 8). Therefore, the liquid paper container 1 can be easily folded. This allows the contents of the viscous liquid to be pushed towards the dispensing member 4 and dispensed to the very last drop, even when only a small amount remains.

[0051] Furthermore, after all the contents have been poured out, the liquid paper container 1 can be folded even smaller by pressing it back and forth. This reduces the volume of the liquid paper container 1 when it is to be disposed of.

[0052] As described above, in the liquid paper container 1 of this embodiment, the rigidity of the main body 2 of the liquid paper container 1 is increased by the presence of ridge portions 28 between the second side plate 222 and the top side plate 232, and between the second side plate 224 and the top side plate 234. As a result, the rigidity of the liquid paper container 1 can be maintained even when there is a large amount of viscous liquid inside, and the liquid paper container 1 is less likely to collapse. In addition, when tilting the liquid paper container 1 to take out the contents, the shape of the main body 2 is less likely to deform, making it easier to tilt.

[0053] Furthermore, when the liquid paper container 1 is folded, the separation part 50 is separated from the liquid paper container 1, and the removal hole 29 is formed. In this state, the middle portions of the second side plates 222 and 224 in the width direction are pressed, causing the second side plates 222 and 224 to bend inward. As a result, the liquid paper container 1 can be easily folded with a simple operation such as pressing the second side plates 222 and 224 inward.

[0054] Furthermore, since the separation section 50 has a paper layer 32, it is printable. Therefore, when a design is formed on the outer surface of the main body 2, it is also printed on the separation section 50. This makes it possible to enhance the design of the liquid paper container 1. In addition, the separation section 50 may be printed with a notation, for example, informing the user to separate the separation section 50 when the liquid paper container 1 is folded due to a decrease in contents.

[0055] <Second Embodiment> Figure 9 is a perspective view of the liquid paper container 1A according to the second embodiment. Figure 10 is a schematic diagram of the separation section of the liquid paper container 1A according to the second embodiment. The liquid paper container 1A shown in Figures 9 and 10 differs from the liquid paper container 1 of the first embodiment in that the second side plates 222 and 224 have holes 9 and the shape of the separation section 50A is different. In all other respects, the liquid paper container 1A has substantially the same configuration as the liquid paper container 1. Therefore, the same reference numerals are used for parts of the liquid paper container 1A that are substantially the same as those of the liquid paper container 1, and detailed descriptions of these parts are omitted.

[0056] As shown in Figure 9, holes 9 are provided in the upper parts of the second side plates 222 and 224. In addition, the lower end of the first separation section 51A is omitted from the separation section 50A, and a straight gripping line 54 is formed. The gripping line 54 is positioned adjacent to the holes 9. The portion of the separation section 50A that is close to the gripping line 54 of the first separation section 51A is the gripping section 511A. In other words, in the separation section 50, the gripping section 511A of the first separation section 51A is adjacent to the holes 9.

[0057] Furthermore, in the separation section 50A, the adhesive layer 34 and the peel-off coat layer 35 are formed so that they do not come into contact with the gripping line 54 and its vicinity. This allows the user to insert their fingers through the hole 9 between the gripping section 511A and the barrier film 36 to grasp the gripping section 511A. Thus, the provision of the hole 9 makes it easier to lift the gripping section 511A, and makes it easier to separate the separation section 50A from the liquid paper container 1A. In other words, using the liquid paper container 1A makes it easier to fold the liquid paper container 1A.

[0058] <Third Embodiment> Figure 11 is a perspective view of the liquid paper container 1B according to the fourth embodiment. Figure 12 is a side view of the liquid paper container 1B in its initial folded state with the second side plates 222 and 224 pressed. Figure 13 is a side view of the liquid paper container 1B in a further folded state. The liquid paper container 1B shown in Figure 11 etc. differs from the liquid paper container 1 of the first embodiment in that the second side plates 222 and 224 have a second fold line 212, a third fold line 213, and a fourth fold line 214. In all other respects, the liquid paper container 1B has substantially the same configuration as the liquid paper container 1. Therefore, the same reference numerals are used for parts of the liquid paper container 1B that are substantially the same as those of the liquid paper container 1, and detailed descriptions of these parts are omitted.

[0059] In the liquid paper container 1B shown in Figure 11, a second fold line 212, a third fold line 213, and a fourth fold line 214 are formed at predetermined positions on the second side panels 222 and 224. The second fold line 212 is a linear shape extending vertically through the widthwise center of a pair of opposing second side panels 222 and 224. The third fold line 213 is positioned below the second fold line 212 and is V-shaped, spreading downwards. The lower ends of both side edges of the second side panels 222 and 224 are positioned on the extension of the V-shaped third fold line 213. The angle of the V-shape of the third fold line 213 is preferably about 90° (approximately 90° ± 10°) to facilitate folding. The second notch 12 is formed continuously with the lower end of the first notch 11, but a vertical gap may be provided between the lower end of the first notch 11 and the upper end of the second notch 12.

[0060] The fourth fold line 214 is formed extending from the upper end of the third fold line 213 in the width direction of the second side panels 222 and 224. In this embodiment, the fourth fold line 214 extends from the upper end of the third fold line 213 toward the back, but it may also extend toward the front.

[0061] In the liquid paper container 1B configured in this way, after the separation section 50 is separated, the central portions in the width direction of the second side panels 222 and 224 are pressed inward. As a result, the second side panels 222 and 224 fold inward along the second fold line 212 and become concave. Furthermore, as the second side panels 222 and 224 become concave, the top side panels 232 and 234 also become concave. As a result, the first side panels 221 and 223 and the inclined panels 231 and 233 move closer together (see Figure 12).

[0062] Furthermore, by compressing the liquid paper container 1 in the front-to-back direction, it folds inward along the third fold line 213 and indents, deforming so that the lower parts of the second side plates 222 and 224 overlap the bottom surface 6. Subsequently, by pressing the rear side of the bottom surface 6 upward, the rear side of the bottom surface 6 is folded upward. In addition, since a fourth fold line 214 is provided extending in the width direction of the second side plates 222 and 224 from the upper end of the third fold line 213, the first side plate 221 adjacent to the second side plates 222 and 224 in the direction in which the fourth fold line 214 extends can be easily folded back (see Figure 13). Therefore, the liquid paper container 1 can be folded even more easily. As a result, even when the contents of the viscous liquid are running low, the contents can be pushed towards the dispensing member 4 and dispensed to the very last drop.

[0063] Furthermore, at least one of the second fold line 212, third fold line 213, and fourth fold line 214 may be formed as a fold line on the first side panels 222 and 224.

[0064] <Fourth Embodiment> Figure 14 is a perspective view of the liquid paper container 1C according to the fourth embodiment. The liquid paper container 1C shown in Figure 15 differs from the liquid paper container 1B of the third embodiment in that the second side plates 222 and 224 have notches 10 instead of the second fold line 212, the third fold line 213, and the fourth fold line 214. In all other respects, the liquid paper container 1C has substantially the same configuration as the liquid paper container 1B. Therefore, the same reference numerals are used for parts of the liquid paper container 1C that are substantially the same as those of the liquid paper container 1B, and detailed descriptions of these parts are omitted.

[0065] In the liquid paper container 1C shown in Figure 14, notches 10 are provided at predetermined positions on the second side panels 222 and 224, where the heat-adhesive resin layer 31, paper layer 32, and intermediate resin layer 33 are cut out.

[0066] The notch 10 has a first notch 11, a second notch 12, a third notch 13, and a fourth notch 14. The first notch 11 is formed as a linear extension in the vertical direction in the widthwise center of a pair of opposing second side plates 222 and 224. The second side plates 222 and 224 are easily bent and indented along the first notch 11. This makes it easy to fold the liquid paper container 1.

[0067] The second notch 12 is located below the first notch 11 and is formed in a V-shape that widens downwards. The lower ends of both side edges of the second side plates 222 and 224 are located on the extension of the V-shaped second notch 12. The angle of the V-shape of the second notch 12 is preferably about 90° (approximately 90° ± 10°) to facilitate folding. The second notch 12 is formed continuously with the lower end of the first notch 11, but a vertical gap may be provided between the lower end of the first notch 11 and the upper end of the second notch 12.

[0068] Since the second notch 12 is continuous with the lower end of the first notch 11, the lower parts of the second side plates 222 and 224 can be easily folded so that they overlap the bottom surface 6. This makes it even easier to fold the liquid paper container 1.

[0069] The third notch 13 is formed extending from the upper end of the second notch 12 in the width direction of the side plates 22b and 22d. In this embodiment, the third notch 13 extends from the upper end of the second notch 12 toward the rear side, but it may also extend toward the front side.

[0070] Furthermore, since a third notch 13 is provided extending in the width direction of the second side plates 222 and 224 from the upper end of the second notch 12, the first side plate 221 adjacent to the second side plates 222 and 224 in the direction of extension of the third notch 13 can be easily folded back. Therefore, the liquid paper container 1 can be folded even more easily. In this embodiment, the third notch 13 is configured to extend toward the first side plate 221, but it may also be configured to extend toward the first side plate 223. In this case, the direction in which the bottom portion 6 folds will be reversed, but the same effect can be obtained.

[0071] The fourth notch 14 is provided on the ridge line formed by the second side plates 222, 224 and the first side plate 223 on the front side. This makes the first side plate 223 on the front side more likely to be recessed inward. Therefore, by holding the body 5 with one hand and pressing on the first side plate 223 with the fingers, the contents of the viscous liquid can be forcibly dispensed. In addition, the second side plates 222, 224 also become more likely to be recessed inward at their vertical center. As a result, even if the separation section 50A has not been removed, the contents of the viscous liquid can be forcibly dispensed by pressing on the second side plates 222, 224 with the fingers.

[0072] Furthermore, since the interior can be seen through the notch 10, the remaining amount of contents can be easily determined. In this embodiment, the notch 10 may be configured to have one of the first notch 11, second notch 12, third notch 13, and fourth notch 14. Even with such a configuration, the effects of each of the notches described above can be obtained. [Industrial applicability]

[0073] According to the present invention, it can be used in liquid paper containers that hold viscous liquids such as salad dressing, ketchup, mayonnaise, shampoo, conditioner, and body soap. [Explanation of symbols]

[0074] 1, 1A, 1B, 1C Liquid paper containers 2 Main body 4 Dispensing Member 5 Torso 6 Bottom part 7 Top section 8 Through hole 9 Hole 10 Notches 11. First notch 12. Second notch 13. Third notch 14. Fourth notch 20 blank plates 21 Fold lines 211 First fold line 212 Second fold line 213 Third fold line 214 Fourth fold line 221, 223 1st side plate 222, 224 2nd side plate 231, 233 inclined plate 232, 234 Ceiling side panels 241~244 Bottom plate 25 Glue allowance piece 28 Ridge section 29 Removal hole 31 Heat adhesive resin layer 32 Paper layer 33 Intermediate resin layer 34 Adhesive layer 35. Peeling Coat Layer 36 Barrier Film 361 Gas barrier layer 362 Barrier substrate layer 38 Adhesive layer 39 Heat adhesive resin layer 41 caps 50, 50A separation section 51, 51A 1st separation section 511, 511A grip part 52 2nd separation section 53 Planned cutting line 531 cut 532 Guide lines 54 Gripping wire

Claims

1. The main body is formed by a laminate consisting of a paper layer, a barrier film, and a heat-adhesive resin layer, A gable-top type liquid paper container having a dispensing member for dispensing the contents, The main body is, A cylindrical body having a pair of first side panels and a pair of second side panels arranged opposite to each other, The bottom portion that closes the bottom surface of the body, The body has a top section which includes a pair of inclined plates that close the top surface of the body and are connected to the upper ends of a pair of first side plates, are inclined and facing each other, and have their upper ends bonded to each other, and a pair of ceiling side plates that are connected to the upper ends of a pair of second side plates and connect the pair of inclined plates, The main body includes, The adhesive strength between the paper layer and the barrier film is lower than that of other parts of the main body, and a separation portion is provided that allows the paper layer to be separated from the barrier film. The aforementioned separation unit is The first separation portion formed on the second side plate, It has a second separation portion formed on the ceiling side panel which is connected to the second side panel and is connected to the first separation portion, A liquid paper container in which at least a portion of the outer edge of the separation portion is connected to the main body portion via a planned cutting line.

2. The liquid paper container according to claim 1, wherein the aforementioned cut line is formed by perforations.

3. The liquid paper container according to claim 1, wherein at least the body portion is provided with a notch in which the paper layer is cut out.

4. The liquid paper container according to claim 1, having at least one fold line formed within the second side panel.

5. The liquid paper container according to any one of claims 1 to 4, wherein the separation portion is not adhered to the barrier film.

6. The second side panel has a hole from which the paper layer has been removed, The liquid paper container according to claim 5, wherein a part of the first separation portion is adjacent to the hole portion.

7. A peel-off coat layer is formed between the paper layer and the barrier film at least at the edge of the separation portion. The liquid paper container according to any one of claims 1 to 4, wherein the adhesive strength between the peel-off coating layer and the paper layer is lower than the adhesive strength between the paper layer and the barrier film in the portion of the main body other than the separation portion.

8. The liquid paper container according to claim 7, wherein the first separation portion of the separation portion has a gripping portion that is not adhered to the barrier film.

9. The second side panel has a hole from which the paper layer has been removed. The liquid paper container according to claim 8, wherein at least the gripping portion of the first separation portion is adjacent to the hole portion.

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