Plug, and pouch with plug

Abstract

To prevent any hole from being opened in a film when welding the film to a plug.SOLUTION: A plug 10 used for a pouch comprises a flow path 11, a spout part 12, and a welded part 13. The welded part 13 has such a shape that a length L1 in a second direction D2 is longer than a length L2 in a third direction D3, and thickness in a third direction D3 becomes smaller toward an end part 13b in the second direction D2 from a center portion 13a in the second direction D2. An outer peripheral surface 13c around the flow path 11 of the welded part 13 has a concave curved surface part 13d which extends in a concave curved shape toward the end part 13b in the second direction D2. A ratio of a peripheral length L3 around the flow path 11 of the welded part 13 with respect to the length L1 in the second direction D2 of the welded part 13 is 2.4 or more. Moreover, the ratio of a curvature radius R of the concave curved surface part 13d with respect to the length L1 in the second direction D2 of the welded part 13 is more than 0.4.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a spout used for a pouch and a spouted pouch equipped with the spout. [Background technology]

[0002] Conventionally, spouted pouches, in which a resin spout is welded to a pair of resin films, have been used as containers for holding contents such as liquids. In spouted pouches, a heated seal bar is pressed against the spout from above the film to melt the sealant layer of the film and the spout, thereby welding the film to the spout. Patent Document 1 describes a technology for preventing the pouch container from breaking due to water hammer when dropped, for example, by optimizing the shape of the lower edge of the welded surface of the spout of such a spouted pouch. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7016225 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, efforts have been made to develop mono-material packaging materials to improve recyclability. The inventors of the present invention evaluated the weldability of polyethylene stoppers and polyethylene-based films and found that some stoppers caused holes in the film.

[0005] Therefore, an object of the present invention is to provide a spout that can prevent holes from being formed in the film due to welding between the film and the spout, and a spout-equipped pouch that includes the spout. [Means for solving the problem]

[0006] The present inventors have conducted further intensive research into the above-mentioned problem, and as a result have reached the following findings. Specifically, when a seal bar is pressed against the film from above the film during welding of the film to the plug, the film is stretched to conform to the outer circumferential surface of the welded portion of the plug, causing the film to thin. If this thinning progresses too much, it is thought that holes will form in the film. Based on this, it has been found that by optimizing the shape of the outer circumferential surface of the welded portion, it is possible to prevent holes from forming in the film due to welding of the film to the plug. The present invention has been made based on the above findings.

[0007] [1] The stopper according to the present invention is a stopper for use with a pouch, and comprises a flow path extending in a first direction, a pouring portion extending in the first direction and forming a part of the flow path, and a welded portion extending in the first direction and forming another part of the flow path, wherein the length of the welded portion in a second direction perpendicular to the first direction is longer than the length in a third direction perpendicular to the first and second directions, and the thickness in the third direction decreases from the center in the second direction toward the end in the second direction, the outer peripheral surface around the flow path of the welded portion has a concave curved portion extending in a concave curved shape toward the end in the second direction, and the ratio of the perimeter around the flow path of the welded portion to the length in the second direction of the welded portion is 2.4 or more.

[0008] In this plug, the length of the welded portion in the second direction is longer than the length in the third direction, and the thickness in the third direction decreases from the center in the second direction toward the end in the second direction. The outer peripheral surface of the welded portion around the flow path has a concave curved portion that extends concavely toward the end in the second direction. Therefore, when a seal bar is pressed against the welded portion from above the film to weld the film, the film is stretched to conform to the outer peripheral surface of the welded portion. However, the ratio of the perimeter of the welded portion around the flow path to the length of the welded portion in the second direction is 2.4 or greater. This prevents excessive thinning of the film caused by stretching. This prevents holes from being formed in the film due to welding between the film and the plug.

[0009] [2] In the plug described in [1], the ratio of the radius of curvature of the concavely curved surface portion to the length of the welded portion in the second direction may be greater than 0.4. In this plug, the ratio of the radius of curvature of the concavely curved surface portion to the length of the welded portion in the second direction is greater than 0.4. This further suppresses excessive thinning of the film caused by stretching the film. This further suppresses holes in the film due to welding between the film and the plug.

[0010] [3] The plug according to [1] or [2] may be made of polyethylene. Since the plug is made of polyethylene, it is easy to recycle.

[0011] [4] The spout pouch according to the present invention comprises a pouch body having a pair of films, and a spout according to any one of [1] to [3] that is disposed between the pair of films and welded to the pair of films, and each of the pair of films has a sealant layer containing polyethylene on its innermost surface.

[0012] In this spouted pouch, the spout is welded to a pair of films, so that when the spouted pouch is manufactured, a seal bar is pressed against the welded portion from above the films, and even if the film is stretched to fit the outer periphery of the welded portion, excessive thinning of the film is suppressed, thereby preventing holes from being formed in the film. [Effects of the Invention]

[0013] According to the present invention, it is possible to prevent holes from being formed in the film due to welding between the film and the spout. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a spouted pouch according to an embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 1 is a perspective view showing a plug according to an embodiment. [Figure 4] FIG. 2 is a front view showing the plug according to the embodiment. [Figure 5] FIG. 2 is a bottom view showing the plug according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI shown in FIG. [Figure 7] 6 is a cross-sectional view of the welded portion taken along line VI-VI shown in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same or equivalent elements will be designated by the same reference numerals, and redundant description will be omitted.

[0016] (Pouch with spout) FIG. 1 is a front view showing a spouted pouch according to an embodiment. The spouted pouch 1 shown in FIG. 1 is used for refilling contents into containers (not shown) such as refill bottles, as well as for packaging beverages and cosmetics. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the spouted pouch 1 according to the embodiment comprises a pouch body 2 and a spout 3. The spout is also called a spout or the like. The pouch body 2 comprises a pair of resin films, a first body film 4A and a second body film 4B, opposed to each other, and a resin folding film 5 folded between the first body film 4A and the second body film 4B. The pouch body 2 may not comprise the folding film 5, or may further comprise another film.

[0017] The first and second body films 4A and 4B are heat-sealed (welded) to each other at their outer edges so as to form a storage area 6 for storing contents inside the spout-equipped pouch 1, and the first and second body films 4A and 4B are heat-sealed to each other at their outer edges and the fold-out film 5 is also heat-sealed to each other at their outer edges. A spout 3 is disposed between the first and second body films 4A and 4B, and the outer edges of the first and second body films 4A and 4B are heat-sealed to the spout 3. The first and second body films 4A and 4B have the same shape, structure, etc. and are heat-sealed to the spout 3, so hereinafter the first and second body films 4A and 4B will be collectively described as body films 4 unless otherwise specified.

[0018] The trunk film 4 is formed from a laminate sheet in which a base layer 7 and a sealant layer 8 are laminated together. The sealant layer 8 forms the innermost surface of the trunk film 4. In other words, the trunk film 4 has the sealant layer 8 on its innermost surface. The laminate sheet that constitutes the trunk film 4 may also include layers other than the base layer 7 and the sealant layer 8. For example, the laminate sheet that constitutes the trunk film 4 may include a barrier layer disposed between the base layer 7 and the sealant layer 8.

[0019] The base layer 7 provides a predetermined rigidity to the body film 4 and has a barrier property that prevents the passage of gas and liquid. The material of the base layer 7 is not particularly limited, but can be, for example, polyolefin (e.g., polyethylene, very low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, or polypropylene) or polyester (e.g., polyethylene terephthalate). The density of very low density polyethylene is 0.900 g / cm 3 The density of low density polyethylene is less than 0.900 g / cm 3 More than 0.925g / cm 3 The density of linear low density polyethylene is less than 0.900 g / cm 3 More than 0.925g / cm3 The density of medium density polyethylene is less than 0.925 g / cm 3 More than 0.945g / cm 3 The density of high density polyethylene is less than 0.945 g / cm 3 or more, or 0.945 g / cm 3 More than 0.980g / cm 3 The following is the result.

[0020] The sealant layer 8 is a meltable layer for welding to the plug 3. In other words, the sealant layer 8 is a heat-sealable layer. The sealant layer 8 contains polyethylene. The polyethylene contained in the sealant layer 8 is not particularly limited, but may be, for example, ultra-low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, or high density polyethylene. Furthermore, the sealant layer 8 may contain polypropylene, polyester (e.g., polyethylene terephthalate), or the like, in addition to polyethylene.

[0021] The contents contained in the storage area 6 of the spouted pouch 1 are not particularly limited, but are preferably liquid. Examples of contents include daily necessities such as liquid detergent, cleaning agent, medicine, cosmetics, shampoo, and conditioner, foods such as liquid seasoning, soup, yogurt, soft drinks, and cooking oil, and industrial products such as lubricating oil and industrial oil. Note that the spouted pouch 1 may also be a pouch with a content inlet stopper in which the contents are contained in the storage area 6.

[0022] The plug 3 is made of polyethylene, preferably high-density polyethylene. "Made of polyethylene" means that the material constituting the plug 3 mainly contains polyethylene, and may contain other polymers, additives, etc. "Made of high-density polyethylene" means that the material constituting the plug 3 mainly contains high-density polyethylene, and may contain other polymers such as medium-density polyethylene and low-density polyethylene, and additives, etc. The weight proportion of high-density polyethylene in the plug 3 is, for example, 80% or more, preferably 90% or more, and more preferably 95% or more.

[0023] The spout 3 has a flow path 31 for circulating the contents accommodated in the pouch body 2, a spout portion 32 disposed on the outside of the pouch body 2 and forming a part of the flow path 31, a welded portion 33 welded to the body film 4 and forming another part of the flow path 31, and a flange portion 34 located between the spout portion 32 and the welded portion 33. Details of the spout 3 will be described later.

[0024] (Seal) Next, a stopper according to an embodiment will be described. Fig. 3 is a perspective view showing the stopper according to the embodiment. Fig. 4 is a front view showing the stopper according to the embodiment. Fig. 5 is a bottom view showing the stopper according to the embodiment. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. As shown in Figs. 3 to 6, the stopper 10 according to the embodiment is a stopper that becomes the stopper 3 of the spouted pouch 1 shown in Figs. 1 and 2. In other words, the stopper 10 shown in Figs. 3 to 6 becomes the stopper 3 of the spouted pouch 1 shown in Figs. 1 and 2 by heat-sealing it to the body film 4. For this reason, the material of the stopper 10, the density of the resin constituting the stopper 10, etc. can be made the same as those of the stopper 3 of the spouted pouch 1.

[0025] The plug 10 includes a flow path 11, a spout portion 12, a welded portion 13, and a flange portion 14.

[0026] The flow path 11 extends in the first direction D1 and penetrates the spout 10 to allow the contents contained in the containing area 6 of the spout-equipped pouch 1 to circulate. In other words, the flow path 11 is a hole formed by the inner circumferential surfaces of the pouring portion 12, the welded portion 13, and the flange portion 14, and is a through-hole that penetrates the spout 10 in the first direction D1.

[0027] The spout 12 is disposed on the outside of the pouch body 2 of the spouted pouch 1, and is a portion for spouting the contents contained in the storage area 6 of the spouted pouch 1. The spout 12 extends in the first direction D1, and forms a part of the flow path 11. The spout 12 is formed in a cylindrical shape. The flow path 11 is formed on the inner circumferential surface of the spout 12, and a threaded portion 12a is formed on the outer circumferential surface of the spout 12 for detachably attaching a cap (not shown). The cap is a member that closes the flow path 11 in an openable and closable manner.

[0028] The welded portion 13 is a portion that is welded to the body film 4. In other words, the welded portion 13 is disposed between the first body film 4A and the second body film 4B and is welded to the first body film 4A and the second body film 4B. The welded portion 13 extends in the first direction D1 and forms another part of the flow path 11.

[0029] The flange portion 14 is a flange-shaped portion located between the pouring portion 12 and the welded portion 13. The flange portion 14 is disposed on the outside of the pouch body 2 of the spout-equipped pouch 1 and extends in a direction perpendicular to the first direction D1. The flange portion 14 is used, for example, to position the welded portion 13 relative to the body film 4. Note that although only one flange portion 14 is provided in this embodiment, multiple flange portions 14 may be provided in the first direction D1.

[0030] Fig. 7 is a cross-sectional view of the welded portion taken along line VI-VI in Fig. 4. As shown in Figs. 3 to 7, the welded portion 13 has a length L1 in a second direction D2 perpendicular to the first direction D1 that is longer than a length L2 in a third direction D3 perpendicular to the first direction D1 and the second direction D2, and has a shape in which the thickness (dimension) in the third direction D3 decreases from a central portion 13a in the second direction D2 toward an end portion 13b in the second direction D2. The outer peripheral surface 13c of the welded portion 13 around the flow path 11 has a concavely curved portion 13d that extends in a concave curved shape toward the end portion 13b in the second direction D2. The outer peripheral surface 13c of the welded portion 13 is also referred to as the outer surface, etc.

[0031] The welded portion 13 has a first side wall portion 16A welded to the first body film 4A and a second side wall portion 16B welded to the second body film 4B. The first side wall portion 16A and the second side wall portion 16B are positioned opposite each other in the third direction D3 and are connected to each other at one end 13b and the other end 13b in the second direction D2 so as to form an acute angle. Note that the first side wall portion 16A and the second side wall portion 16B have the same shape, structure, etc., and therefore, hereinafter, the first side wall portion 16A and the second side wall portion 16B will be collectively referred to as the side wall portion 16 unless otherwise specifically described separately.

[0032] For example, grooves 18 and ribs 19 may be formed in the side wall 16 of the welded portion 13. The grooves 18 are portions recessed from the outer surface of the side wall 16. The ribs 19 are portions protruding from the outer surface of the side wall 16. When grooves 18 are formed in the side wall 16 of the welded portion 13, the number, size, shape, position, etc. of the grooves 18 are not particularly limited. Furthermore, when ribs 19 are formed in the side wall 16 of the welded portion 13, the number, size, shape, position, etc. of the ribs 19 are not particularly limited.

[0033] The ratio (L1 / L3) of the circumferential length L3 of the welded portion 13 around the flow path 11 to the length L1 of the welded portion 13 in the second direction D2 is 2.4 or more, preferably 2.5 or more, and more preferably 2.9 or more. The circumferential length L3 of the welded portion 13 is the length of one circumference around the flow path 11 on the outer circumferential surface 13c of the welded portion 13. The circumferential length L3 of the welded portion 13 is the circumferential length of the welded portion 13 in a cross section perpendicular to the first direction D1 where the outer shape of the welded portion 13 is the largest. When the welded portion 13 has a rib 19, the circumferential length L3 of the welded portion 13 is, for example, the circumferential length of the welded portion 13 in a cross section perpendicular to the first direction D1 that passes through the apex of the rib 19.

[0034] The ratio (R / L1) of the radius of curvature R of the concavely curved surface portion 13d to the length L1 of the welded portion 13 in the second direction D2 exceeds 0.4, preferably 0.45 or more, and more preferably 0.47 or more. The radius of curvature R of the concavely curved surface portion 13d is the radius of curvature of the concavely curved surface portion 13d in a cross section perpendicular to the first direction D1 where the outer shape of the welded portion 13 is the largest. Furthermore, if the radius of curvature of the concavely curved surface portion 13d in that cross section varies depending on the location, the radius of curvature R is the smallest radius of curvature of the concavely curved surface portion 13d in that cross section.

[0035] When manufacturing a spout-equipped pouch 1 using the spout 10 configured in this manner, first, a pouch intermediate (not shown) is prepared in which the first body film 4A and the second body film 4B are not heat-sealed to each other at their upper edge portions in the pouch body 2. Next, a preheating step is performed. In the preheating step, a heated seal bar (not shown) is pressed against the welded portion 13 to preheat the welded portion 13. Next, the welded portion 13 of the spout 10 is positioned between the upper edge portion of the first body film 4A and the upper edge portion of the second body film 4B. Next, a heat-sealing step is performed. In the heat-sealing step, a heated seal bar is pressed against the welded portion 13 from above the first body film 4A and the second body film 4B. This melts the sealant layers 8 of the first body film 4A and the second body film 4B, and also melts the welded portion 13 of the spout 10, so that the sealant layers 8 of the first body film 4A and the second body film 4B are welded to the welded portion 13 of the spout 10. As a result, the first body film 4A and the second body film 4B are welded to the welded portion 13. The heat sealing process can be performed multiple times, for example, twice. The preheating process is not necessarily performed, but is preferably performed from the viewpoint of properly melting the welded portion 13. Next, a cooling process is performed. In the cooling process, the first body film 4A, the second body film 4B, and the welded portion 13 are cooled. As a result, the first body film 4A and the second body film 4B are completely welded to the welded portion 13, and the spout-equipped pouch 1 described above is produced.

[0036] As described above, in the plug 10 according to this embodiment, the length L1 of the welded portion 13 in the second direction D2 is longer than the length L2 in the third direction D3, and the thickness in the third direction D3 decreases from the center 13a in the second direction D2 toward the end 13b in the second direction D2, and the outer peripheral surface 13c around the flow path 11 of the welded portion 13 has a concavely curved portion 13d that extends concavely toward the end 13b in the second direction D2. Therefore, when the seal bar is pressed against the welded portion 13 from above the body film 4 during welding of the body film 4 to the welded portion 13, the body film 4 is stretched to conform to the outer peripheral surface 13c of the welded portion 13. However, the ratio (L3 / L1) of the perimeter L3 around the flow path 11 of the welded portion 13 to the length L1 of the welded portion 13 in the second direction D2 is 2.4 or more, preferably 2.5 or more, and more preferably 2.9 or more. This prevents excessive thinning of the body film 4 caused by stretching the body film 4. This prevents holes from being formed in the body film 4 when the body film 4 is welded to the spout 10.

[0037] Furthermore, in this plug 10, the ratio (R / L1) of the radius of curvature R of the concave curved surface portion 13d to the length L1 in the second direction D2 of the welded portion 13 exceeds 0.4, preferably 0.45 or more, and more preferably 0.47 or more. This further suppresses excessive thinning of the body film 4 caused by stretching the body film 4. This further prevents holes from being formed in the body film 4 when the body film 4 is welded to the plug 10.

[0038] Furthermore, since the plug 10 is made of polyethylene, it is easy to recycle.

[0039] In the spouted pouch 1 according to this embodiment, the spout is welded to the first body film 4A and the second body film 4B, and therefore, during the production of the spouted pouch 1, by pressing a seal bar against the welded portion 13 from above the first body film 4A and the second body film 4B, excessive thinning of the first body film 4A and the second body film 4B is suppressed even if the first body film 4A and the second body film 4B are stretched so as to conform to the outer peripheral surface 13c of the welded portion 13. This makes it possible to prevent holes from being formed in the first body film 4A and the second body film 4B.

[0040] The above describes an embodiment of the present invention, but the present invention is not limited to the above embodiment, and may be modified or applied to other things within the scope that does not change the gist described in each claim. [Example]

[0041] Next, examples of the present invention will be described, but the present invention is not limited to the following examples.

[0042] (Preparation of laminate) The following materials were used to make the laminate: Base layer: Unstretched HDPE film (thickness: 35 μm, density: 0.948 g / cm 3 , melting point: 135℃) Adhesive layer: urethane adhesive First sealing layer: low temperature sealable LLDPE (density: 0.916 g / cm 3 , MFR: 4.0g / 10min, Melting point: 102℃) Second sealing layer: Anti-stick VLDPE (density: 0.913g / cm 3 , MFR: 10.0g / 10min, Melting point: 104℃)

[0043] A first seal layer (thickness: 80 μm) was provided on the surface of the support film. A second seal layer (thickness: 20 μm) was provided on the surface of this first seal layer to obtain a sealant layer with a two-layer structure. This sealant layer and a base layer were bonded together via an adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. After bonding the base layer and sealant layer together, the support film was peeled off.

[0044] (Making a stopper) The stoppers of Examples 1 and 2 and Comparative Examples 1 and 2 were made of high-density polyethylene (HDPE). Each of the stoppers of Examples 1 and 2 and Comparative Examples 1 and 2 had a flow path extending in a first direction, a spout extending in the first direction to form part of the flow path, and a welded portion extending in the first direction to form another part of the flow path, the length of the welded portion in a second direction perpendicular to the first direction being longer than the length in a third direction perpendicular to the first and second directions, and the thickness in the third direction decreasing from the center in the second direction toward the end in the second direction.

[0045] In the plugs of Examples 1 and 2 and Comparative Example 1, the outer surface around the flow path of the welded portion all has a concave curved portion that extends in a concave curved shape toward the end in the second direction, while the plug of Comparative Example 2 does not have such a concave curved portion.

[0046] In the plugs of Examples 1 and 2 and Comparative Examples 1 and 2, the length L1 of the welded portion in the second direction, the circumferential length L3 around the flow path of the welded portion, the radius of curvature R of the concave curved portion, the ratio (L3 / L1) of the circumferential length L3 around the flow path of the welded portion to the length L1 of the welded portion in the second direction, and the ratio (R / L1) of the radius of curvature R of the concave curved portion to the length L1 of the welded portion in the second direction were as shown in Table 1.

[0047] [Table 1]

[0048] (Sample preparation) A pair of laminates was welded to each stopper to obtain samples of Examples 1 and 2 and Comparative Examples 1 and 2. In this heat sealing, the temperature of the pair of laminates was changed in 5°C increments from 140°C to 175°C, and the pair of laminates was welded to the stopper under conditions of a time of 0.9 seconds and a pressure of 0.6 MPa. After that, the pair was cooled at room temperature for 1.5 seconds.

[0049] (Weldability evaluation) The samples of Examples 1 and 2 and Comparative Examples 1 and 2 were subjected to an evaluation of weldability.

[0050] In the weldability evaluation, if no holes were observed in the laminate, no pinholes were formed in the laminate in the pressure test, and the laminate broke in the tensile test, the weld between the plug and the pair of laminates was good and the product was given an A rating. If the welding between the stopper and the pair of laminates was weak, no holes were observed in the laminates and no pinholes appeared in the laminates during the pressure test, but if the laminates peeled off face-to-face during the tensile test, the welding between the stopper and the pair of laminates was weak and the product was rated B. If holes were observed in the laminates, or if no holes were observed in the laminates but pinholes appeared in the laminates during the pressure test, the product was rated C. The evaluation results are shown in Table 1.

[0051] In the pressure resistance test, each sample was filled with 100 ml of tap water at 25°C and sealed, and when pressure was applied to each sample, a visual evaluation was made to see whether pinholes opened and the tap water leaked out. Pressurization was performed by placing each sample horizontally between a support stand and a pressure plate, and applying a load of 40 kgf from above the pressure plate for 3 minutes.

[0052] For the tensile test, a pair of laminates was cut from each sample into a 15 mm wide strip so as to include the stopper, to obtain a cut sample. Next, using a Tensilon universal material testing machine (product name "Tensilon RTC-1250", manufactured by Orientec Co., Ltd.), the pair of laminates of the cut sample were pulled in opposite directions to each other, and it was observed whether at least one of the pair of laminates broke or peeled at the end of the welded part of the stopper.

[0053] (Consideration) As shown in Table 1, Comparative Example 1 was rated C at all welding temperatures, and Comparative Example 2 was rated C at welding temperatures of 140°C to 160°C. In contrast, Examples 1 and 2, in which the ratio (L3 / L1) of the perimeter L3 around the flow path of the welded portion to the length L1 of the welded portion in the second direction was 2.4 or greater, were both rated A at all welding temperatures. From these results, it is inferred that by having a ratio (L3 / L1) of the perimeter L3 around the flow path of the welded portion to the length L1 of the welded portion in the second direction of 2.4 or greater, it is possible to prevent holes from being formed in the laminate and to obtain good weldability. [Explanation of symbols]

[0054] 1...pouch with spout, 2...pouch body, 3...spout, 4...body film, 4A...first body film, 4B...second body film, 5...folded film, 6...storage area, 7...base material layer, 8...sealant layer, 10...spout, 11...flow path, 12...pouring portion, 12a...screw portion, 13...welded portion, 13a...central portion, 13b...end portion, 13c...outer periphery, 13d...concave curved portion, 14...flange portion, 16...side wall portion, 16A...first side wall portion, 16B...second side wall portion, 18...groove, 19...rib, 31...flow path, 32...pouring portion, 33...welded portion, 34...flange portion.

Claims

1. A spout for use in a pouch, a flow path extending in a first direction; a spout portion extending in the first direction and forming a part of the flow path; a welded portion extending in the first direction and forming another part of the flow path, the welded portion has a length in a second direction perpendicular to the first direction that is longer than a length in a third direction perpendicular to the first direction and the second direction, and a thickness in the third direction that decreases from a center portion in the second direction toward an end portion in the second direction, an outer peripheral surface of the welded portion around the flow path has a concave curved surface portion extending in a concave curved shape toward the end portion in the second direction, a ratio of a circumferential length of the welded portion around the flow path to a length of the welded portion in the second direction is 2.4 or more; Mouth plug.

2. a ratio of the radius of curvature of the concave curved surface portion to the length of the welded portion in the second direction is greater than 0.4; The plug according to claim 1.

3. It is made of polyethylene, The plug according to claim 1.

4. a pouch body having a pair of films; and the plug according to any one of claims 1 to 3, which is disposed between a pair of films and welded to the pair of films, Each of the pair of films has a sealant layer containing polyethylene on its innermost surface. Pouch with spout.

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