Standing Pouch

Abstract

To provide a standing pouch capable of achieving improvement in a self-standing property.SOLUTION: A standing pouch is constituted by: two pieces of side films 1, 2 opposing to each other; and a bottom film 3 folded between the side films. The left and right sides of the side films 1, 2 are welded by a provided side seal. The side seal comprises: upper parts 22, 23 in which the side films 1, 2 are welded via an inflection point X; and lower parts 26, 27, 27, 28 in which the side film 1 and one half surface of the bottom film 3 folded and arranged are welded, and in which the side film 2 and the other half surface of the bottom film 3 are welded. Furthermore, the standing pouch includes: first oblique seals 31, 33 extended obliquely upward from the side seal; and second oblique seals 36, 37, 37, 38 extended obliquely downward from the side seal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stand-up pouch formed from a resin film, and more particularly to a stand-up pouch filled with a liquid or fluid such as a beverage or medicine. [Background technology]

[0002] Figure 10 is an image diagram of a typical standing pouch. A standing pouch can stand on its own by placing two opposing resin films as side films, inserting a folded bottom film between the side films, and sealing the edges (see, for example, Patent Document 1). When filled with a liquid or fluid such as a beverage or medicine, a spout is provided at the top as an appropriate pouring outlet.

[0003] Because of their ability to stand up, producers can efficiently package products in cardboard boxes and transport them efficiently. Retailers can display products in stores in an attractive manner. Consumers can easily organize and store them at home. Furthermore, they can be rolled up after use to reduce their volume. Compared to other containers such as cans and bottles, production costs are low. These features have led to the widespread use of stand-up pouches.

[0004] Incidentally, stand-up pouches currently available on the market are often used to package jelly foods and refill detergents, and since they are often intended for general consumers, they have a relatively small capacity. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-065624 Summary of the Invention [Problem to be solved by the invention]

[0006] Stand-up pouches are finding wider applications due to their convenience. They are not only targeted at general consumers but may also be used for commercial purposes. Large capacity may be required for commercial use. The capacity of standing pouches currently available on the market is 1 to 2 liters, even for those considered large capacity, but they may also exceed 2 liters. In this application, a standing pouch equivalent to 5 liters is envisioned as a prototype example. Of course, a pouch exceeding 5 liters may also be considered.

[0007] However, as the capacity increases, the container tends to become unstable, especially when filled with liquids or fluids such as beverages or medicines.

[0008] The present invention is intended to solve the above-mentioned problems, and has an object to provide a standing pouch that can be made to stand upright. [Means for solving the problem]

[0009] To achieve the above object, the stand-up pouch of the present invention comprises two opposing side films, a bottom film folded and disposed between the side films, and side seals provided on the left and right of the side films, the side seals consisting of an upper section where the two side films are welded together via an inflection point, and a lower section where one side film is welded to one half of the folded bottom film and the other side film is welded to the other half of the bottom film, and further comprises a first oblique seal extending diagonally upward from the side seals, and a second oblique seal extending diagonally downward from the side seals.

[0010] When filling the contents, the contents deform along the first diagonal seal, lowering the center of gravity of the contents, improving the container's ability to stand upright.

[0011] In the above invention, preferably, the first oblique seal extends obliquely upward through the inflection point, and the second oblique seal extends obliquely downward through the inflection point or through a position above the inflection point.

[0012] This effectively reinforces and seals the inflection point, improving drop resistance.

[0013] In the above invention, preferably, the second oblique seal passes above the inflection point by a distance equal to or less than the width of the second oblique seal and extends obliquely downward.

[0014] This effectively reinforces and seals the inflection point, improving drop resistance.

[0015] In the above invention, preferably, the first oblique seal passes through the inflection point or a position above the inflection point and extends obliquely upward, and the second oblique seal passes through the inflection point and extends obliquely downward.

[0016] This effectively reinforces and seals the inflection point, improving drop resistance.

[0017] In the above invention, preferably, the first oblique seal passes above the inflection point by a distance equal to or less than the width of the first oblique seal and extends obliquely downward.

[0018] This effectively reinforces and seals the inflection point, improving drop resistance.

[0019] In the above invention, preferably, the intersection of the inside of the first oblique seal and the inside of the second oblique seal is above the inflection point.

[0020] This effectively reinforces and seals the inflection point, improving drop resistance. [Effects of the Invention]

[0021] The standing pouch of the present invention can improve the self-standing property, particularly when a large volume is assumed.

[0022] Furthermore, it is possible to improve drop resistance while maintaining high self-standing ability, particularly when large capacity is assumed. [Brief explanation of the drawings]

[0023] [Figure 1] Basic configuration diagram of this embodiment [Figure 2] Basic configuration diagram of this embodiment [Figure 3] Illustrative diagram of the effect of this embodiment (improved independence) [Figure 4] Operational explanation diagram of this embodiment [Figure 5] Detailed configuration diagram of this embodiment [Figure 6] Second diagonal seal position study data [Figure 7] Second diagonal seal position study data [Figure 8] Illustrative diagram of the effect of this embodiment (improved drop resistance) [Figure 9] Detailed configuration diagram of a modified example [Figure 10] Image of a typical standing pouch DETAILED DESCRIPTION OF THE INVENTION

[0024] ~Basic configuration~ The basic configuration of an embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a side view of the overall configuration of a container. Figure 2 is an exploded perspective view and a partial cross-sectional view of the overall configuration of the container.

[0025] The standing pouch is composed of two opposing side films 1 and 2 and a bottom film 3 that is folded and placed between the side films 1 and 2. A spout 41 is appropriately provided at the top as a pouring outlet.

[0026] The side films 1, 2 have edges 11 to 14 on the four sides of the rectangle. The bottom film 3 is folded in two to form a fold line 6, and has side edges 16, 16, 17, 17 and bottom edges 18, 18.

[0027] The side films 1 and 2 and the bottom film 3 are welded together by seals 21 to 29 and 36 to 39.

[0028] The top seal 21 welds the ends 11, 11 of the side films 1, 2. However, a portion is not welded to ensure the pouring function of the spout 41. The side seal upper part 22 welds the ends 12, 12 of the side films 1, 2. The side seal upper part 23 welds the ends 13, 13 of the side films 1, 2.

[0029] The lower side seal 26 welds the end 12 of the side film 1 to the end 16 of the bottom film 3. The lower side seal 27 welds the end 12 of the side film 2 to the end 16 of the bottom film 3. The lower side seal 28 welds the end 13 of the side film 1 to the end 17 of the bottom film 3. The lower side seal 29 welds the end 13 of the side film 2 to the end 17 of the bottom film 3.

[0030] The side seal upper part 22 and the side seal lower parts 26, 27 form one side seal with the inflection point X. The side seal upper part 23 and the side seal lower parts 28, 29 form the opposite side seal with the inflection point X between them.

[0031] The bottom seal 24 welds the end 14 of the side film 1 to the end 18 of the bottom film 3. The bottom seal 25 welds the end 14 of the side film 2 to the end 18 of the bottom film 3.

[0032] The melting point of the outer surface of the bottom film 3 is lower than the melting point of the inner surface of the bottom film 3. Therefore, the bottom film 3 and the side films 1 and 2 are welded together, but the ends 16, 16, the ends 17, 17, and the ends 18, 18 of the bottom film 3 are not welded together. Therefore, in principle, the lower side seal parts 26, 27 are not welded together, and the lower side seal parts 28, 29 are not welded together.

[0033] Two corresponding semicircular holes are provided at the ends 16, 16 of the bottom film 3. Two corresponding semicircular holes are provided at the ends 17, 17 of the bottom film 3. Through these semicircular holes, the point seal 40 welds the ends 12, 12 and the ends 13, 13 of the side films 1, 2 also at the bottom of the side seal.

[0034] That is, contrary to the above principle, the side seal lower parts 26 and 27 are welded via the point seal 40, and the side seal lower parts 28 and 29 are welded via the point seal 40.

[0035] Diagonal seal 36 welds side film 1 to bottom film 3. Diagonal seal 37 welds side film 2 to bottom film 3. Diagonal seals 36, 37 correspond to each other on the front and back. Diagonal seal 38 welds side film 1 to bottom film 3. Diagonal seal 39 welds side film 2 to bottom film 3. Diagonal seals 38, 39 correspond to each other on the front and back.

[0036] The bottom surface of the standing pouch is formed in the area surrounded by the diagonal seals 36 and 37, the bottom seal 25, the diagonal seals 39 and 38, and the bottom seal 24.

[0037] The oblique seals 36, 37, 38, 39 have their upper ends near the side seal inflection point X (detailed position will be described later), extend obliquely downward, and are continuous with the bottom seals 24, 25. The angle formed between the oblique seals 36, 37, 38, 39 and the bottom seals 24, 25 is preferably about 45 degrees.

[0038] When a liquid or fluid is filled into the stand-up pouch, the bottom film 3 unfolds and a gusset is formed. At this time, the side seal lower parts 26, 27 and 28, 29 are generally independent of each other and do not interfere with the formation of the bottom. As a result, a larger bottom is formed and the pouch is able to stand upright. Meanwhile, the point seal 40 maintains the integrity of the side seal lower parts 26, 27 and 28, 29. As a result, the pouch is able to stand upright.

[0039] ~Characteristic composition and its effects~ The characteristic configuration of the embodiment of the present invention will be described below. The side films 1 and 2 are further welded together by diagonal seals 31 and 33.

[0040] The diagonal seal 31 extends diagonally upward from the side seal, passing near the side seal inflection point X (detailed position described later), and is continuous with the upper seal 21. At this time, care is taken not to impede the pouring function of the spout 41. The lower end of the seal 31 is continuous with the lower side seal parts 26, 27. The diagonal seal 33 extends diagonally upward from the side seal, passing near the side seal inflection point X (detailed position described later), and is continuous with the seal 34 (described later). The lower end of the seal 33 is continuous with the lower side seal parts 28, 29.

[0041] Figure 3 is an explanatory diagram of the effect of this embodiment. The upper side of the figure is a comparative example without diagonal seals 31, 33, and the lower side is an example with diagonal seals 31, 33. Consider the position of the center of gravity of the contents when a liquid or fluid is filled into a standing pouch. An auxiliary line is shown at the position connecting the top ends of the left and right bottom gussets.

[0042] Although the upper side seal portions 22 and 23 are parallel to each other, when a bottom gusset is formed by filling the contents, the upper side seal portions 22 and 23 are positioned so that they open upward in the comparative example. The contents conform to the shape of the container, forming an inverted trapezoid in side view. The center of gravity of the contents is located above the auxiliary line. As a result, the container becomes unstable and loses its ability to stand upright.

[0043] In contrast, in this embodiment, the container has an inverted trapezoidal shape in side view below the auxiliary line, but above the auxiliary line, the contents deform along the diagonal seals 31 and 33, forming a trapezoidal shape in side view. The center of gravity of the contents is located closer to the auxiliary line. As a result, the container is stable and self-standing is improved.

[0044] The formation of the diagonal seals 31 and 33 is carried out in the same manner as the formation of other seals, i.e., no special process or special equipment is required.

[0045] Comparing the above-described embodiment and comparative example, the capacity is slightly reduced by the diagonal seals 31 and 33. However, the present application is intended for a capacity exceeding 1 to 2 liters (e.g., equivalent to 5 liters), which is generally considered to be a large capacity, and a slight reduction in volume does not have an effect.

[0046] Another characteristic configuration will now be described. In this embodiment, the side films 1, 2 are further welded to the handle auxiliary seal 34. One end of the auxiliary seal 34 branches off from the side seal upper portion 23, extends parallel to the top seal 21, bends midway, and connects with the top seal 21 at a position that does not interfere with the pouring function of the spout 41.

[0047] Four holes corresponding to four fingers are provided in the area surrounded by top seal 21, handle auxiliary seal 34, and upper side seal 23, and a seal is formed surrounding handle 42, while the area around the holes is not sealed. Incidentally, this application is intended for a capacity exceeding 1 to 2 liters, which is generally considered large (e.g., equivalent to 5 liters), and when the weight of the contents acts, the resin film around the holes stretches appropriately to fit the fingers, and the seal around handle 42 prevents excessive deformation.

[0048] ~New challenges and how to deal with them~ The upper side seal 22 welds the two side films 1 and 2 together, while the lower side seal 26 welds the side film 1 to the bottom film 3, and the lower side seal 27 welds the side film 2 to the bottom film 3. Similarly, the upper side seal 23 welds the two side films 1 and 2 together, while the lower side seal 28 welds the side film 1 to the bottom film 3, and the lower side seal 29 welds the side film 2 to the bottom film 3. In other words, the lower side seal is twice as thick as the upper side seal. Even if the same amount of heat is supplied, the lower side seal is likely to be insufficient. As a result, when a bag is dropped and impacted, there is a risk of the bag tearing at inflection point X between the upper and lower side seals. According to the inventor's experiments, the strength at inflection point X was approximately 30% lower than the other areas.

[0049] 4 is an explanatory diagram of the operation of this embodiment. This embodiment is characterized by lowering the center of gravity of the contents by using diagonal seals 31 and 33. As a result, when a drop impact occurs, the load may act near the inflection point.

[0050] This application is intended for a capacity exceeding 1 to 2 liters (for example, equivalent to 5 liters), which is generally considered to be a large capacity, and the weight of the contents itself is greater, making the problem of drop resistance more pronounced.

[0051] In response to this new problem, in this embodiment, the positional relationship between the inflection point X and the diagonal seals 31, 33 and 36, 37, 38, 39, and the inflection point X is considered, thereby effectively reinforcing the seal around the inflection point X.

[0052] ~Seal position consideration~ 5 is a detailed configuration diagram of the periphery of the inflection point X. Since the side seal upper part 22 and the side seal lower part 26 have width, the inflection point X is at the inner end (on the content side).

[0053] First, the diagonal seal 31 is positioned so that its center passes through the inflection point X. Some deviation is allowed. Next, we consider the cases where the center of the diagonal seal 36 passes through the inflection point X, and where it is shifted upward by L1, and where it is shifted downward by L1.

[0054] A prototype container measuring 330 mm wide, 180 mm wide at the bottom, and 350 mm high was sealed at 210°C under 0.5 MPa for 3.0 seconds. Seals 22 and 26 were 10 mm wide, and seals 31 and 36 were 6 mm wide. The container was filled with tap water and refrigerated at 5°C overnight. Five test bags were prepared for each test.

[0055] The bag was dropped vertically from a height of 100cm five times and then given one horizontal impact. If the bag did not break, it was dropped vertically five more times. If the bag still did not break, the vertical height was changed to 120cm, 140cm, and 160cm.

[0056] Four seal positions were compared: L1 = +10 mm, +5 mm, ±0 (overlap), and -5 mm (downward displacement).

[0057] Figure 6 shows the results of the study when the material was PET (polyethylene terephthalate). ○ indicates no bag breakage, × indicates bag breakage. When L1 = 0 (the center intersection overlaps with inflection point X), none of the bags broke. When L1 = +5 mm, sample 1 broke after a single drop, but this is presumed to be an initial defect. Sample 3 did not break when dropped from 100 cm, but did break after being dropped from 120 cm. All samples 2, 4, and 5 did not break.

[0058] When L1 = +10 mm, Sample 1 broke after 5 drops. Sample 2 broke after 7 drops. Sample 3 broke after being dropped from 120 cm. Sample 4 broke after 5 drops. Sample 5 broke after 9 drops. When L1 = -5 mm, Samples 1 to 4 broke after 1 drop. Sample 5 broke after 2 drops.

[0059] In other words, the most preferable case was L1 = 0 (the center intersection overlaps with the inflection point X), and when L1 = +5 mm, the results were similar to those of L1 = 0, but when L1 = +10 mm, the results were extremely unsuitable. When L1 = -5 mm, no reinforcement effect could be expected at all.

[0060] From the above, it is optimal for the seal center intersection to overlap with inflection point X, but it is acceptable if it is shifted upward by about the width of the seal. If it is shifted too far upward, the reinforcing effect cannot be expected. Also, if it is shifted downward, the reinforcing effect cannot be expected.

[0061] Figure 7 shows the results of the study when the material was Ny (nylon). ○ indicates no bag breakage, × indicates bag breakage. When L1 = 0 (the center intersection overlaps with inflection point X), sample 1 broke after seven drops. Sample 2 broke after ten drops. Samples 3 and 5 broke after horizontal impact. Sample 4 broke after two drops. When L1 = +5 mm, sample 1 broke after three drops. Sample 3 broke after horizontal impact. Samples 2, 4, and 5 broke after one drop.

[0062] When L1 = +10 mm, sample 1 broke after two drops. Samples 2, 3, 4, and 5 broke after one drop. When L1 = -5 mm, all of the bags broke after one drop.

[0063] The soft material nylon did not produce the best results compared to the hard material PET. However, a similar trend was observed. That is, it is optimal for the seal center intersection to coincide with inflection point X, but an upward shift of approximately the seal width is acceptable.

[0064] 8 is a diagram illustrating the above-mentioned study results from another perspective. The upper side of the figure is a comparative example in which the seal 36 is shifted downward, and the lower side of the figure is an embodiment in which the seal center intersection coincides with the inflection point X.

[0065] In the comparative example, the intersection Y between the inside of seal 31 and the inside of seal 36 coincides with inflection point X. In this state, the load of the drop impact acts directly on inflection point X. In other words, if seal 36 shifts downward, the bag becomes more likely to tear.

[0066] In contrast, in the embodiment, the intersection Y between the inside of seal 31 and the inside of seal 36 is located L2 (for example, 2 mm) above inflection point X. The load of the drop impact acts on intersection Y. On the other hand, the seal around inflection point X is reinforced, which suggests that bag breakage is suppressed.

[0067] That is, the diagonal seals 31 and 33 for improving self-standing property also contribute to improving drop resistance by considering the position where a reinforcing effect can be obtained.

[0068] In Figure 5, the position of the diagonal seal 36 was considered under the assumption that the center of the diagonal seal 31 passes through the inflection point X. However, as a modified example, the position of the diagonal seal 31 was considered under the assumption that the center of the diagonal seal 36 passes through the inflection point X, and similar trends were obtained.

[0069] Figure 9 is a detailed diagram of the area around inflection point X in the modified example. In the modified example, it is optimal for the seal center intersection to coincide with inflection point X, but it is acceptable for diagonal seal 31 to be shifted upward, with L1 being approximately the seal width. In this case, intersection point Y between the inside of seal 31 and the inside of seal 36 is located L2 (for example, 2 mm) above inflection point X. Bag breakage is also prevented in the modified example.

[0070] In FIG. 5, it is assumed that the center of the diagonal seal 31 passes through the inflection point X, and in FIG. 8, it is assumed that the center of the diagonal seal 36 passes through the inflection point X, but the seals 31 and 36 may be slightly misaligned as long as the inflection point X can be appropriately reinforced and sealed.

[0071] ~Other configurations~ The intersections of seal 31 and seal 21, seal 31 and seal 22, seal 33 and seal 34, seal 33 and seal 23, seal 36 (37) and seal 26 (27), seal 36 (37) and seal 24 (25), seal 38 (39) and seal 28 (29), seal 38 (39) and seal 24 (25), seal 31 and seal 36 (37), and seal 33 and seal 38 (39) are rounded. This allows the load to be dispersed even when a drop impact is applied to the seal. This also improves drop resistance.

[0072] Furthermore, even when a load of impact from a drop acts on the four point seals 40, the integrity of the side seal lower parts 26, 27 and 28, 29 is maintained, which also improves drop resistance. [Explanation of symbols]

[0073] 1 Side film 2 Side film 3 Bottom film 6. Folding line 11~14 Film edge 16~18 Film edge 21 Upper seal 22, 23, 26-29 Side seal 24,25 Lower seal 31,33 Diagonal seal 34 Handle support sticker 36~39 Diagonal sticker 40 point stickers 41 Spout 42 Handle

Claims

1. The bag comprises two opposing side films, a bottom film folded and disposed between the side films, and side seals provided on the left and right sides of the side films, The side seal is composed of an upper portion and a lower portion that is continuous with the upper portion via an inflection point at the inner end of the side seal, and two side films are welded to the upper portion, and one side film is welded to one half of the folded bottom film at the lower portion, and the other side film is welded to the other half of the bottom film. In stand-up pouches, a first oblique seal extending obliquely upward from the side seal; a second oblique seal extending obliquely downward from the side seal; Equipped with The center of the first oblique seal extends obliquely upward through the inflection point, The center of the second oblique seal passes through the inflection point or a position above the inflection point and extends obliquely downward. A standing pouch characterized by the above.

2. The center of the second oblique seal passes above the inflection point by a distance equal to or less than the width of the second oblique seal and extends obliquely downward.

2. The standing pouch according to claim 1, wherein the pouch is a stand-up pouch.

3. The bag comprises two opposing side films, a bottom film folded and disposed between the side films, and side seals provided on the left and right sides of the side films, The side seal is composed of an upper portion and a lower portion that is continuous with the upper portion via an inflection point at the inner end of the side seal, and two side films are welded to the upper portion, and one side film is welded to one half of the folded bottom film at the lower portion, and the other side film is welded to the other half of the bottom film. In stand-up pouches, a first oblique seal extending obliquely upward from the side seal; a second oblique seal extending obliquely downward from the side seal; Equipped with The center of the first oblique seal passes through the inflection point or a position above the inflection point and extends obliquely upward, The center of the second oblique seal passes through the inflection point and extends obliquely downward. A standing pouch characterized by the above.

4. The center of the first oblique seal passes above the inflection point by a distance equal to or less than the width of the first oblique seal and extends obliquely downward.

4. The standing pouch according to claim 3.

5. The intersection of the inside of the first diagonal seal and the inside of the second diagonal seal is above the inflection point.

5. The standing pouch according to claim 1, wherein the pouch is a stand-up pouch.

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