Packaging bag with pouring tool and manufacturing method thereof

Abstract

To provide a packaging bag with a pouring tool and a manufacturing method thereof in which the packaging bag and a pouring tool consist of the same type of resin and are easily reused, and the packaging bag and the pouring tool are well bonded without a gap.SOLUTION: A packaging bag with a pouring tool consists of: a laminate body equipped with at least a sealant layer and a substrate layer; and a pouring tool equipped with an attachment part and a pouring hole. The pouring tool is disposed between the laminate bodies overlapped so that the sealant layers of the laminate body face each other. The attachment part is heat-welded with the sealant layer to be integrated. The sealant layer and the substrate layer, and the pouring tool consist of a propylene-based polymer. A difference (A0-A1) between an absorbance ratio A1 by FT-IR measurement of the substrate layer near both ends of the attachment part, and an absorbance ratio A0 by the FT-IR measurement of the substrate layer in an unsealed portion except near both ends of the attachment part is 0.05 or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a packaging bag with a spout and a manufacturing method thereof, and more particularly to a packaging bag with a spout made of the same material that allows easy reuse of the material, and a manufacturing method thereof. [Background technology]

[0002] A spouting tool is attached to a packaging bag containing liquid or viscous substances in order to facilitate removal of the contents. Such a packaging bag with a spouting tool is not only excellent in terms of spouting ability, but also has a cap, so that the spouting tool can be resealed if the contents are not used up or consumed completely. As an example of such a packaging bag with a pouring device, the following Patent Document 1 describes a spouted pouch which is made by folding a laminate having at least a base material and a sealant layer to form a continuous front, top, and back surface and heat-sealing the peripheral portions, wherein a fold-in portion folded toward the top surface is heat-sealed to the bottom of the front and back surfaces, the vertical length of the top surface is shorter than the length of the fold-in portion, and the length of the folded portion of the top surface and the front or back surface that is not heat-sealed is shorter than the horizontal straight portion of the lower end of the front and back surfaces.

[0003] In the pouch described in Patent Document 1 below, a film made of polyester or nylon is exemplified as the base layer of the laminate constituting the pouch, and it is described that an olefin resin such as polyethylene or polypropylene can be used as the sealant layer. However, if the pouch, including the pouring tool, is made of the same type of material, it can be reused without the need for troublesome separation work, and from the viewpoint of environmental friendliness, etc., monomaterial products are desired. To solve such problems, Patent Document 2 listed below describes a laminate for a packaging bag with a spout, which is characterized in that the laminate includes a substrate and a sealant layer, the substrate and the sealant layer are made of the same material, the substrate has been subjected to at least one of a stretching treatment and an electron beam irradiation treatment, and the same material is polyethylene or polypropylene, and also describes a packaging bag having a storage section and a spout formed from this laminate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-30619 A [Patent Document 2] JP 2020-157517 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the laminate and the spout are molded from the same type of resin and the packaging bag and the spout are fused together by heat sealing, the spout is thicker than the laminate, so if the packaging bag and the spout are heat-sealed at a temperature that can fuse them together, the packaging bag near the spout becomes overheated, and the laminate adheres to the heat seal bar, causing a problem that part of it disappears. On the other hand, even if the heat sealing is performed at a temperature that does not cause overheating, the spout is not heated sufficiently, and the two cannot be reliably joined. In order to solve this problem, if the portion containing the pouring tool is heated with a heat seal bar separately from the portion containing only the laminate, gaps or insufficient bonding may occur at the interface between the packaging bag and the pouring tool, which may result in liquid leakage.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a packaging bag with a spout which is made of the same type of resin, is easily reusable, and in which the packaging bag and the spout are joined well together without any gaps. Another object of the present invention is to provide a method for producing a packaging bag with a spout, which can reliably join a spout and a packaging bag made of the same type of resin by heat sealing. [Means for solving the problem]

[0007] According to the present invention, there is provided a packaging bag with a pouring tool, which comprises a laminate having at least a sealant layer and a base material layer, and a pouring tool having an attachment portion and a pouring hole, the pouring tool being disposed between the laminates which are overlapped so that the sealant layers of the laminates face each other, and the attachment portion is integrated with the sealant layer by heat welding, wherein the sealant layer, base material layer, and pouring tool are made of a propylene-based polymer, and the difference (A0-A1) between the absorbance ratio A1, as determined by FT-IR measurement, of the base material layer in the vicinity of both ends of the attachment portion and the absorbance ratio A0, as determined by FT-IR measurement, of the base material layer in an unsealed portion other than the vicinity of both ends of the attachment portion is 0.05 or more.

[0008] In the packaging bag with a pouring tool of the present invention, (1) The sealant layer is made of an unstretched film, and the base layer is made of a stretched film; (2) the absorbance ratio A1 is in the range of 0.74 to 0.85; (3) The melting point of the propylene-based polymer constituting the sealant layer, the base layer, and the pouring tool is in the range of 155 to 175°C; (4) The base material layer in the vicinity of both ends of the mounting portion is within a range of 50 mm from each end of the mounting portion; (5) The laminate has a barrier layer between the base layer and the sealant layer. (6) The pouring tool is a spout. is preferred.

[0009] The present invention also provides a method for producing a packaging bag with a spout, comprising: overlapping laminates having at least a sealant layer and a base layer made of a propylene-based polymer so that the sealant layers face each other, arranging a spout made of a propylene-based polymer having an attachment portion and a spout hole between the laminates, and then heat-sealing the laminates and the spout, wherein the heat-sealing step comprises a spout welding step of heat-sealing the sealant layer in the vicinity of the attachment portion of the spout and both ends thereof at a temperature range of 20 to 80°C higher than the melting point (Tm) of the laminate, and a periphery welding step of heat-sealing the periphery of the laminate including the attachment portion of the spout at a temperature range of 10°C lower to 10°C higher than the melting point (Tm) of the laminate. Effect of the Invention

[0010] In the packaging bag with a spout of the present invention, since both the packaging bag and the spout are made of a propylene-based polymer, separation of the raw materials is not required when recycling, and this is excellent in environmental friendliness and economy. In addition, according to the manufacturing method of the present invention, by dividing the heat sealing process into two processes with different temperatures, it is possible to attach the pouring tool to the packaging bag securely and without gaps without damaging the laminate that constitutes the packaging bag. Furthermore, in a packaging bag with a pouring tool manufactured by this manufacturing method, the difference (A0-A1) in the absorbance ratio measured by FT-IR between the base material layer near both ends of the attachment position (attachment portion) of the pouring tool and the base material layer in the other unsealed portion (the laminate itself) is 0.05 or more. When this difference in absorbance ratio is 0.05 or more, it is clear from the results of the examples described below that the pouring tool is securely attached without any gaps between the packaging bag and the base material layer. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a front view showing an example of the packaging bag with a spout of the present invention. [Diagram 2] 2 is an enlarged view of the attachment position of the spouting tool in the packaging bag with spouting tool shown in FIG. 1. [Diagram 3] 1A to 1C are diagrams for explaining a method for producing a packaging bag with a spout of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (Packaging bag with pouring tool) An important feature of the packaging bag with pouring device of the present invention is that the sealant layer and base material layer of the laminate constituting the packaging bag, and the pouring device, are made of a propylene-based polymer, and the difference (A0-A1) between the absorbance ratio A1 determined by FT-IR measurement of the base material layer near both ends of the mounting portion and the absorbance ratio A0 determined by FT-IR measurement of the base material layer of the unsealed portion (the laminate itself) other than the ends of the mounting portion is 0.05 or more. The absorbance ratio of the packaging bag with a pouring tool of the present invention clearly indicates the crystal structure and orientation state of the base layer of the packaging bag with a pouring tool. The difference in absorbance ratio (A0-A1) means that the base layer in the heat-sealed portion near both ends of the attachment portion has a crystal structure and orientation different from that of the base layer in the unsealed portion, and a difference in absorbance ratio (A0-A1) of 0.05 or more is an indicator that the pouring tool is securely attached to the packaging bag without any gaps and has excellent sealing performance. Incidentally, it is preferable that the absorbance ratio A1 is in the range of 0.74 to 0.85, which indicates that both ends of the attachment part of the spouting tool are sufficiently heated and the spouting tool is securely attached to the packaging bag. The conditions for FT-IR measurement of the absorbance ratios A0 and A1 in the present invention will be described later.

[0013] FIG. 1 is a front view showing an example of a packaging bag with a spout of the present invention. The packaging bag with a spout, generally designated 1, comprises a packaging bag 2 and a spout 3. As shown in FIG. The packaging bag 2 is formed by overlapping two laminates 4a, 4b with the sealant layers facing each other and heat sealing them, and has side seal portions 5a, 5b, a bottom seal portion 5c, and a top seal portion 5d around the periphery, as well as an oblique seal portion 5e with a spout 3 attached to the upper left. The spout 3 is composed of an attachment base 6 and a cylindrical pouring portion 7 extending upward (outside the packaging bag) from the attachment base 6, and the attachment base 6 is disposed between the laminates 4a, 4b of the oblique seal portion 5e of the packaging bag 2 and is welded and fixed to the packaging bag 2. In addition, a cap 8 is attached to the cylindrical pouring portion 7.

[0014] Figure 2 shows an enlarged view of the attachment position of the spout of the packaging bag with spout shown in Figure 1. As shown in Figure 2, the absorbance ratio A1 of the base material layer near both ends 10a, 10b of the attachment base 6 of the spout 3 is smaller by 0.05 or more than the absorbance ratio A0 of the base material layer in the unsealed portion other than these portions. The vicinity of both ends of the attachment part of the pouring tool where the absorbance ratio A1 should be measured is preferably within 50 mm, preferably within 25 mm, more preferably within 10 mm, and particularly preferably within 5 mm from each end of the attachment part (attachment base 6). The above range clearly represents the attachment condition of the pouring tool due to multiple heating by the manufacturing method described later. If the part outside this range is measured, the difference in absorbance ratio may not be reliably measured.

[0015] [Packaging bag] The laminate constituting the packaging bag comprises at least a base layer and a sealant layer, both of which are made of a resin composition containing a propylene-based polymer as a main component. The resin composition must contain 70% by mass or more of a propylene-based polymer, but there are no limitations on other components, such as an ethylene-α-olefin copolymer elastomer containing an α-olefin having 3 to 10 carbon atoms and ethylene, or a polyethylene-based polymer. As the propylene polymer, any of homopolypropylene, propylene block copolymer, and propylene random copolymer can be used. Examples of α-olefins that can be suitably copolymerized with propylene include, but are not limited to, ethylene, butene-1, and 4-methyl-1-pentene. The propylene-based polymer may be an impact polypropylene having an ethylene-propylene copolymer dispersed in a homopolypropylene or a propylene random copolymer. Among these propylene-based polymers, propylene block copolymers and homopolypropylenes can be suitably used in the base layer.

[0016] In addition, a propylene block copolymer can be suitably used in the sealant layer. From the viewpoint of environmental consideration, it is more preferable that the base layer or the sealant layer contains a biomass-derived component (e.g., propylene or ethylene) or that recycled materials are used. In the present invention, it is preferable that the resin composition containing a propylene-based polymer as a main component, which is used for the base layer and the sealant layer, has a melting point in the range of 155 to 175°C. This makes it possible to handle high-temperature retort sterilization in which the package is subjected to high-temperature conditions of 125°C or higher. The film made of a propylene-based polymer used for the base layer is preferably a uniaxially or biaxially stretched film (OPP) from the viewpoint of mechanical strength, and the film made of a propylene-based polymer used for the heat seal layer is preferably an unstretched film (CPP) from the viewpoint of heat sealability.

[0017] The laminate used in the packaging bag of the present invention may include, in addition to the above-mentioned base layer and sealant layer, a barrier layer, a layer made of a functional resin based on a propylene-based polymer, such as an easy-tearable resin layer, and a printed layer. As the barrier layer, a layer made of a gas barrier resin such as a polyvinyl alcohol-based polymer or a polycarboxylic acid-based polymer, or a barrier film coated with a coating agent can be used. However, when a layer made of a gas barrier resin is provided, as described above, it is necessary that the laminate constituting the packaging bag contains 70% by mass or more of a polypropylene-based polymer. In addition to the gas barrier property, a barrier layer having a moisture barrier property for preventing the moisture of the contents from escaping to the outside of the pouch can be used, for example, an inorganic oxygen deposition layer such as a metal oxide deposition layer such as aluminum oxide or a silicon oxide deposition layer, an inorganic deposition film formed with an inorganic deposition layer such as a hydrocarbon deposition layer such as diamond-like carbon, or a barrier film coated with a coating agent made of a compound having a metalloxane bond by a hydrolysis compound such as a metal alkoxide or a metal halide.

[0018] The film on which the above-mentioned inorganic vapor deposition layer or barrier coating layer is formed is preferably made of a propylene-based polymer from the viewpoint of monomaterial, and in particular, a uniaxially or biaxially stretched film used for the above-mentioned base layer can be preferably used. The barrier film or the like is preferably provided between the substrate layer and the sealant layer, and the coating layer or vapor deposition layer can be formed directly on the surface of the substrate layer on which the sealant layer is located. Furthermore, the printed layer can be formed in the same manner as in a conventionally known laminate having a printed layer, and although not limited thereto, printing may be performed directly on the base layer or sealant layer, or printing may be performed on the surface of the barrier layer that is not coated with an inorganic vapor deposition layer or the like.

[0019] In the laminate used for the packaging bag of the present invention, the substrate layer preferably has a thickness of 6 to 200 μm, more preferably 10 to 90 μm, and the sealant layer preferably has a thickness of 30 to 150 μm, more preferably 50 to 100 μm. When the film forming the inorganic deposition layer or barrier coating layer described above is formed as an intermediate layer, the thickness of the film is preferably 6 to 50 μm, more preferably 10 to 30 μm. The laminate used in the packaging bag of the present invention can be produced by a conventionally known method, and when it has a two-layer structure of a base layer and a sealant layer, it can be produced by co-extrusion, and when it has a barrier intermediate layer, it can be laminated by a dry lamination method, a sandwich lamination method, an extrusion lamination method, etc. From the viewpoint of environmental consideration, a solventless lamination method using a solventless adhesive is more preferable. As the adhesive used for lamination by the dry lamination method or the like, any adhesive that has conventionally been used for laminating films made of propylene-based polymers can be used without any restrictions, and although not limited thereto, urethane-based adhesives and epoxy-based adhesives can be preferably used.

[0020] 1, the packaging bag of the present invention is configured to use a pair of films 4a, 4b and have a sealed periphery, but is not limited to this configuration. For example, the packaging bag may be configured by folding one film and sealing two or three sides, or may be configured by sandwiching a folded film forming a bottom between a pair of films and sealing it, and may be applicable to all types of packaging bags known in the art, such as pillow type, gusset type, standing type, etc.

[0021] The spout used in the packaging bag with spout of the present invention can be any of various types of spouts known in the art, as long as it is made of a propylene-based polymer, and can be molded by injection molding using a homopolypropylene or a propylene block copolymer, although this is not limited thereto. As described above, it is preferable that the sealant layer and the base layer are formed from a propylene-based polymer having a melting point in the range of 155 to 175°C. In the spout shown in Fig. 2, a screw portion for attaching and detaching a cap and a flange portion for improving mechanical strength are formed on the outer surface of the spout tube, but the spout is not limited to this. For example, the spout may be one in which the tip of the spout tube is broken off to form an opening, a straight pipe from the spout tube to the mounting base, or a spout for an infusion container in which a rubber stopper is fitted to the tip of the spout opening.

[0022] (Method of manufacturing packaging bag with spout) The manufacturing method of the packaging bag with a pouring tool of the present invention includes a heat welding step in which laminates having at least a sealant layer and a base layer made of a propylene-based polymer are stacked so that the sealant layers face each other, a pouring tool made of a propylene-based polymer is placed between the laminates, and then the laminates and the pouring tool are integrated. An important feature of the manufacturing method of the present invention is that the heat welding step is performed in at least two stages: a pouring tool welding step in which only the sealant layer in the vicinity of the attachment part of the pouring tool and both ends thereof is heat-welded at a temperature range of 20 to 80°C higher than the melting point (Tm) of the propylene-based polymer constituting the sealant layer of the laminate, and a peripheral welding step in which the peripheral part of the laminate including the attachment part of the pouring tool is heat-welded at a temperature range of 10°C lower to 10°C higher than the melting point (Tm) of the propylene-based polymer constituting the sealant layer of the laminate.

[0023] FIG. 3 is a diagram for explaining a heat welding step for attaching a spout in the manufacturing method of the present invention. Before being subjected to the heat-sealing process, the laminates 4a and 4b are stacked together with the sealant layers facing each other, and the side seals 5a and 5b and the bottom seal 5c are sealed to form the packaging bag 2 with the diagonal seal 5e remaining unsealed. The diagonal seal 5e is then sealed in the process shown in Fig. 3(A) to (D) to be described later, thereby forming the packaging bag 1 with the spout device. The top seal 5d is sealed after the packaging bag 1 with the spout device is filled with the contents. FIG. 3(A) is a diagram showing the process of temporarily fixing the pouring tool. With the mounting base 6 of the pouring tool placed between the laminates 4a, 4b of the diagonal seal portion 5e, which is the unsealed portion of the packaging bag 2, it is desirable to heat the vicinity of both ends 10a, 10b of the mounting base 6 (hatched portions in FIG. 3(A)) from both the top and back sides, and the mounting base 6 of the pouring tool from the top side, at a temperature of -30 to +40°C (the set temperature of the heating device) of the melting point (Tm) of the propylene-based polymer constituting the sealant layer for 0.3 to 3.0 seconds to temporarily fix the pouring tool 3, as shown in FIG.

[0024] Fig. 3(B) is a diagram showing the spout welding process, and as shown in Fig. 3(B), only the vicinity 10a, 10b of both ends of the attachment base 6 of the spout (hatched portion in Fig. 3(B)) and the attachment base 6 of the spout are heated from both sides at a temperature (set temperature of the heating device) of the melting point of the propylene-based polymer constituting the sealant layer +10 to +80°C, particularly +20 to +70°C, while being pressed with a pressure of 0.1 to 0.9 MPa, to fuse the attachment base of the spout to the packaging bag. The heating time varies depending on the heating temperature and pressure and cannot be generally specified, but is preferably in the range of 0.3 to 3.0 seconds. Next, Figure 3(C) is a diagram showing the peripheral welding process. As shown in Figure 3(C), the entire diagonal seal portion 5e including the mounting base 6 of the spout (the hatched portion in Figure 3C) is heated for 0.3 to 3.0 seconds while being pressed with a pressure of 0.1 to 0.9 MPa in a temperature range from 10°C lower to 10°C higher than the melting point (Tm) of the propylene-based polymer that constitutes the sealant layer. Thereafter, as shown in FIG. 3(D), the diagonal seal portion 5e (hatched portion in FIG. 3(D)), which is the attachment portion of the spout, is cooled while being fixed in a mold at room temperature to prevent warping of the film, and a packaging bag with a spout is produced.

[0025] The packaging bag with the spout obtained through the above process can be reliably attached without gaps at both ends of the spout, since both side ends 10a, 10b of the attachment base 6 of the spout have been subjected to two welding processes with different heating temperatures. In addition, by dividing such reliable welding into a high-temperature heat welding process of the spout and a low-temperature heat welding process of the periphery based on the melting point of the propylene-based polymer constituting the sealant layer, it is possible to reduce damage caused by overheating the laminate, particularly the base layer, and to effectively suppress damage to the packaging bag. As a result, since both ends of the attachment base of the spout have been subjected to two heat histories, the crystallinity and orientation are reduced, and as described above, the absorbance ratio A1 by FT-IR measurement is in the range of 0.74 to 0.85, which is 0.05 or more lower than the absorbance ratio A0 by FT-IR measurement of the unsealed portion (the laminate itself).

[0026] In the manufacturing method of the present invention, the spouting tool is temporarily fixed before the heat welding process, but the temporary fixing process is not necessarily required as long as the spouting tool is sandwiched between the laminates without moving. Furthermore, the peripheral portion is heat-sealed after the spouting tool is heat-sealed, but the peripheral portion may be heat-sealed first. Furthermore, in the present invention, as long as the spout and the part of the packaging bag to which it is attached (the spout and its surrounding area) have the characteristics described above, the shape of the packaging bag, the attachment position of the spout, and the filling method are not limited to those specifically described in this specification. EXAMPLES

[0027] The laminate (laminate material) used for the packaging bag was a 20 μm stretched PP film / 20 μm stretched PP film / 70 μm unstretched PP film, and a PP spout was used as the pouring tool. The melting points and melting end temperatures (DSC melting peak end temperatures) of these are shown in Table 1 below. Using the above laminate material and spout, a spout attachment test was carried out using a continuous spout attachment tester. The testing machine consists of a packaging bag conveying device, a spout conveying device, a primary sealing section (spout welding process), a secondary sealing section (periphery welding process), and a cooling section. The packaging bag conveying device is a device that fixes the packaging bag and intermittently moves each sealing section and the cooling section. The spout conveying device is a device that inserts the spout mounting section into an open packaging bag. The primary sealing section is a section that opens the packaging bag, temporarily fastens the spout mounting section inserted by the spout conveying device to the packaging bag, and heat seals it. The secondary sealing section is a section that heat seals the edges that sandwich the spout mounting section. The cooling section is a section that cools and seals the film edge including the spout with a room temperature heat seal bar.

[0028] The heat sealing conditions are shown in the following Table 2. However, the heat seal bar used in these regions was covered with PTFE tape from the viewpoint of protecting the mold.

[0029] FT-IR measurement conditions Two film sample pieces were obtained by cutting out the center of the pouch of the spout-equipped packaging bag and the edge (heat-sealed part) that sandwiched the spout mounting part and cutting off the mounting base of the spout. The substrate layer, which is the outermost surface of the film, was measured by total reflection measurement (ATR) using a Fourier transform infrared spectrometer (FT-IR: JASCO FT-IR 6700) at two locations: a position about 3 mm away from the end of the mounting base (film part with heat history of the first and second seals: sealed part near the mounting base) and the unsealed part in the center of the pouch (unsealed part) to obtain an infrared absorption spectrum. The measurement conditions are as follows. IRE: Diamond Reflection count: 1 Incident angle: 45° Resolution: 4cm-1 Number of times: 32 Measurement wave number range: 1600cm -1 ~700cm -1 Based on the infrared absorption spectrum obtained, -1 ~995cm -1 Maximum peak height (maximum absorbance) (α) in the range of 975 cm -1 ~970cm -1 The ratio (α / β) for the maximum peak height (maximum absorbance) (β) within the range was calculated, and the absorbance ratios were determined as A0 (absorbance ratio of the base material layer in the unsealed portion other than the vicinity of the mounting base) and A1 (absorbance ratio of the base material layer in the sealed portion near the mounting base). The results are shown in Table 3 below.

[0030] [Table 1]

[0031] [Table 2]

[0032] [Table 3] [Explanation of symbols]

[0033] 1 Packaging bag with spout, 2 Packaging bag, 3 Spout, 4 Laminated body, 5 Sealing portion, 6 Mounting base, 7 Spout tube portion, 10 Both side ends of mounting base.

Claims

1. A packaging bag with a pouring tool, comprising a laminate having at least a sealant layer and a base layer, and a pouring tool having an attachment part and a pouring hole, the pouring tool being disposed between the laminates which are stacked so that the sealant layers of the laminates face each other, and the attachment part being heat-sealed and integrated with the sealant layer, The sealant layer, the base layer, and the spout are made of a propylene-based polymer; The packaging bag with a pouring device is characterized in that the difference (A0-A1) between the absorbance ratio A1 of the base material layer in the vicinity of both ends of the attachment portion as determined by FT-IR measurement and the absorbance ratio A0 of the base material layer in an unsealed portion other than the vicinity of both ends of the attachment portion as determined by FT-IR measurement is 0.05 or more.

2. 2. The packaging bag with a spout according to claim 1, wherein the sealant layer is made of an unstretched film, and the base layer is made of a stretched film.

3. The packaging bag with a pouring device according to claim 2, wherein the absorbance ratio A1 is in the range of 0.74 to 0.

85.

4. 2. The packaging bag with a pouring tool according to claim 1, wherein the melting point of the propylene-based polymer constituting the sealant layer, the base layer and the pouring tool is in the range of 155 to 175°C.

5. 3. The packaging bag with a pouring tool according to claim 1, wherein the base material layer in the vicinity of both ends of the attachment portion is within a range of 50 mm from each end of the attachment portion.

6. 3. The packaging bag with a spout according to claim 1, wherein the laminate has a barrier layer between the base layer and the sealant layer.

7. 3. The packaging bag with a spout according to claim 1, wherein the spout is a spout.

8. A method for producing a packaging bag with a pouring tool, comprising: stacking laminates each having at least a sealant layer and a base layer made of a propylene-based polymer so that the sealant layers face each other; arranging a pouring tool made of a propylene-based polymer and having an attachment part and a pouring hole between the laminates; and then heat-sealing the laminates and the pouring tool to be integrated together, The method for manufacturing a packaging bag with a pouring tool is characterized in that the heat welding process includes a pouring tool welding process in which the sealant layer at the attachment portion of the pouring tool and near both ends thereof is heat-sealed at a temperature range of 10 to 80°C higher than the melting point (Tm) of the laminate, and a peripheral welding process in which the peripheral portion of the laminate, including the attachment portion of the pouring tool, is heat-sealed at a temperature range of 10°C lower to 10°C higher than the melting point (Tm) of the laminate.

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