Packaging bag and method for manufacturing packaging bag

Abstract

To provide a packaging bag capable of suppressing deterioration of easy-openability even when a processing error occurs.SOLUTION: The packaging bag 1 includes a storage portion 2 capable of storing a predetermined content, and a pouring portion 5 capable of pouring the content when the packaging bag is opened. The spout portion 5 includes a spout 51 through which the content is poured out, a tab portion 52 that can be gripped by the user when opening the spout portion, a notch 56 provided in the tab portion 52, and a half-cut line 57 that defines the opening of the spout. The notch 56 includes a first side D1 extending obliquely with respect to the direction h1 and having a height direction h2 of a predetermined ratio or more with respect to the height 56a of the knob portion 52, and a second side D2 extending in a direction intersecting the direction 56b. The half-cut line 57 is provided above a point 56a where the first side 56b and the second side P1 intersect with each other such that one end 57a thereof is located on the first side 56a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a packaging bag and a method for manufacturing the packaging bag. [Background technology]

[0002] Packaging bags are known that include a storage section that can store a predetermined content and a spout section that can spout the content when the bag is opened (see, for example, Patent Documents 1 to 3). For example, Patent Document 1 describes a refill bag that includes a bag body and a nozzle-shaped spout-forming section that is provided on the upper edge of the bag body. This refill bag has a tearable line that crosses the spout-forming section. One or both ends of the tear line have a notch and a half-cut line to make it easier to start cutting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-69930 [Patent Document 2] Patent No. 4642600 [Patent Document 3] Patent No. 5365259 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described packaging bag, a configuration may be adopted in which a notch is provided in alignment with the half-cut line to improve ease of opening. For example, the half-cut line is provided by laser processing, and the notch is provided by punching. In this case, the half-cut line and the notch are provided in separate processes, and processing errors in each process may cause misalignment between the half-cut line and the notch in the height direction. If such misalignment occurs, the spout forming portion cannot be properly opened, and ease of opening may be reduced. However, since processing errors when providing the half-cut line and the notch are difficult to eliminate, a packaging bag and a method for manufacturing the packaging bag are desired that can prevent misalignment between the half-cut line and the notch and suppress a decrease in ease of opening, even when processing errors occur.

[0005] An object of the present invention is to provide a packaging bag and a method for manufacturing the packaging bag that can suppress a decrease in easy-open properties even when processing errors occur. [Means for solving the problem]

[0006] [1] One aspect of the present invention relates to a packaging bag. The packaging bag includes a storage section capable of storing a predetermined content and a spout section from which the content can be dispensed when the bag is opened. The spout section includes a spout outlet through which the content is dispensed, a grip section that a user can grip when opening the spout section, a notch in the grip section, and a half-cut line that defines the opening of the spout. The notch extends at an angle relative to the height direction and includes a first side having a height component that is equal to or greater than a predetermined percentage of the height of the grip section, and a second side extending in a direction intersecting the extension of the first side. The half-cut line is positioned above the point where the first side and the second side intersect, with one end of the half-cut line positioned on the first side.

[0007] In this packaging bag, the notch extends at an angle relative to the height direction and includes a first side having a height component that is equal to or greater than a predetermined percentage of the height of the tab portion. Because the first side of the notch has a height component that is equal to or greater than a predetermined percentage of the height of the tab portion, a sufficient tolerance for heightwise misalignment can be ensured. Furthermore, in this packaging bag, the half-cut line is provided above the intersection of the first side and the second side, with one end of the line positioned on the first side. Because the half-cut line is provided as described above on the first side, which ensures a sufficient tolerance for heightwise misalignment, even if a processing error occurs in the process of providing the half-cut line or notch, the processing error is absorbed by the height component of the first side. In other words, this packaging bag is less likely to be misaligned between the half-cut line and the notch. As a result, even if a processing error occurs, a decrease in easy-openability can be suppressed.

[0008] [2] In the packaging bag of [1] above, the angle between the first side and the second side may be 45° or more and 80° or less. In this case, the ease of opening can be improved.

[0009] [3] In the packaging bag of [1] or [2] above, the half-cut line may be provided 2.0 mm or more above the point where the first side and the second side intersect, with one end located on the first side. In this case, misalignment between the half-cut line and the notch is even less likely to occur. As a result, even if processing errors occur, deterioration of easy-openability can be further suppressed.

[0010] [4] The packaging bag of any one of [1] to [3] above may be formed by sealing a first laminate film including a substrate and a sealant layer made of the same material with a second laminate film including a substrate and a sealant layer made of the same material. In this case, a mono-material packaging bag can be achieved while suppressing a decrease in easy-openability.

[0011] [5] In the packaging bag of [4] above, the first laminate film and the second laminate film may contain recycled materials. In this case, even in a packaging bag formed of the first laminate film and the second laminate film containing recycled materials, deterioration in easy-openability can be suppressed.

[0012] [6] In another aspect, the present invention relates to a method for manufacturing a packaging bag. This manufacturing method includes the steps of: preparing a packaging bag including a storage section capable of storing a predetermined content and a spout section from which the content can be poured when the bag is opened, the spout section including a spout outlet through which the content is poured and a tab portion that a user can grip when opening the spout; providing a half-cut line that defines an opening of the spout; and providing a notch in the tab portion, the half-cut line including a first side that extends at an angle relative to the height direction and has a height component that is equal to or greater than a predetermined percentage of the height of the tab portion, and a second side that extends in a direction intersecting the first side. In the notch providing step, the notch is provided above the point where the first side and the second side intersect, so that one end of the half-cut line is positioned on the first side.

[0013] In this method for manufacturing a packaging bag, the notch is provided so that the first side has a height component that is equal to or greater than a predetermined percentage of the height of the tab. Because the first side of the notch has a height component that is equal to or greater than a predetermined percentage of the height of the tab, a sufficient tolerance for heightwise misalignment can be ensured. Furthermore, in this method for manufacturing a packaging bag, the notch is provided above the point where the first side and the second side intersect, so that one end of the half-cut line is positioned on the first side. By providing a notch including a first side that has a sufficient tolerance for heightwise misalignment, as described above, even if a processing error occurs in the step of providing the half-cut line or the notch, the processing error is absorbed by the height component of the first side. In other words, in this method for manufacturing a packaging bag, misalignment between the half-cut line and the notch is unlikely to occur. As a result, even if a processing error occurs, a decrease in easy-openability can be suppressed. [Effects of the Invention]

[0014] According to the present invention, even if processing errors occur, it is possible to suppress a decrease in the easy-open property. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a front view showing a packaging bag according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a cross section of a laminated film forming the packaging bag shown in FIG. [Figure 3] 3 is an enlarged front view showing the vicinity of the spout of the packaging bag shown in FIG. [Figure 4] FIG. 4 is a diagram showing a process for producing the packaging bag shown in FIG. [Figure 5] FIG. 5 is an enlarged front view showing the vicinity of the spout of a packaging bag according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a packaging bag and a manufacturing method thereof according to one embodiment of the present invention will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions may be designated by the same reference numerals, and redundant description will be omitted. Note that the present invention is not limited to the following embodiment.

[0017] Fig. 1 is a front view showing a packaging bag according to this embodiment. As shown in Fig. 1, the packaging bag 1 includes a storage section 2 that stores (is capable of storing) a predetermined content, a seal section 3 formed around the storage section 2, an injection section 4 having an injection port for injecting the content into the storage section 2, and a pouring section 5 from which the content can be poured out when the bag is opened. The seal section 3 includes a first seal section 3a provided on one side of the storage section 2 (the left side in the figure), a second seal section 3b provided on the other side of the storage section 2 (the right side in the figure), and a third seal section 3c provided at the bottom of the storage section 2. In addition, the injection section 4 is designed to be heat-sealed and closed after the content has been placed in the storage section 2.

[0018] The packaging bag 1 is formed by sealing a first laminate film 10 and a second laminate film 20 together. In this embodiment, the first laminate film 10 and the second laminate film 20 include a substrate and a sealant layer made of the same material (see FIG. 2). Note that the term "same material" here does not only mean a film made of the exact same material, but also includes a film made of the same main constituent material. Such a first laminate film 10 and a second laminate film 20 including a substrate and a sealant layer made of the same material are also referred to as a first laminate film 10 and a second laminate film 20 having the same mono-material structure. That is, in this embodiment, the packaging bag 1 is formed from a first laminate film 10 and a second laminate film 20 having the same mono-material structure. The first laminate film 10 and the second laminate film 20 are also made of the same material.

[0019] Such a packaging bag 1 is formed by sealing the first laminate film 10 and the second laminate film 20 at predetermined locations with their respective sealant layers facing inward. In forming the packaging bag 1, when sealing the first laminate film 10 and the second laminate film 20, a bottom tape (not shown) is sandwiched between the first laminate film 10 and the second laminate film 20 on the bottom side to perform sealing. In this manner, the first sealed portion 3a, the second sealed portion 3b, and the third sealed portion 3c described above are formed. Note that, like the first laminate film 10 and the second laminate film 20, the bottom tape is also composed of a laminate including a base material and a sealant layer. Formation of the packaging bag by heat sealing can be carried out in the same manner as conventional methods.

[0020] Here, the first laminate film 10 and the second laminate film 20 that form the packaging bag 1 will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view showing a cross section of the laminate film that forms the packaging bag shown in Fig. 1. As shown in Fig. 2, the first laminate film 10 and the second laminate film 20 each include base materials 11, 21 and sealant layers 12, 22. For example, the base materials 11, 21 and the sealant layers 12, 22 are each formed from a polyethylene resin or a polypropylene resin.

[0021] [Base material] The substrates 11 and 21 are made of, for example, polyethylene resin or polypropylene resin, and are preferably made of an unstretched polyethylene resin film. Since the substrates 11 and 21 are unstretched, there is almost no resin orientation, and they are easily stretched but not easily broken by external stresses such as tension or shear. The substrates 11 and 21 may be stretched polyethylene resin films. The thickness of the substrates 11 and 21 is, for example, 5 to 800 μm, and may be 5 to 500 μm or 10 to 50 μm. The substrates 11 and 21 may have a melting point that is 20° C. or more higher than that of the sealant layers 12 and 22, and preferably 25° C. or more higher. The difference in melting points between the substrates 11 and 21 and the sealant layers 12 and 22 can prevent the substrates 11 and 21 from melting during the heat-sealing process. The difference in seal initiation temperature between the substrates 11 and 21 and the sealant layers 12 and 22 is preferably 25° C. or more, more preferably 30° C. or more. The seal initiation temperature refers to the temperature at which seal strength is developed. The melting point of the polyethylene resin can be measured using a differential scanning calorimeter (DSC).

[0022] The melting point of the substrates 11 and 21 is, for example, within a range of 100 to 170°C, preferably 120°C or higher, and more preferably 125°C or higher. Examples of polyethylene constituting the substrates 11 and 21 include high-density polyethylene (HDPE) and medium-density polyethylene (MDPE). Among these, HDPE and MDPE with a density of 0.925 g / cm are preferred from the viewpoint of heat resistance. 3 It is preferable to use a material having a density of 0.93 to 0.98 g / cm or more. 3It is preferable to use high density polyethylene in the range of

[0023] The polyethylene resin constituting the substrates 11 and 21 is not limited to petroleum-derived resins, and may be partially or entirely biologically derived resin materials (for example, biomass polyethylene using biomass-derived ethylene as a raw material). A method for producing biomass-derived polyethylene is disclosed, for example, in JP-A 2010-511634. The substrates 11 and 21 may contain commercially available biomass polyethylene (such as Green PE manufactured by Braskem), or may contain mechanically recycled polyethylene made from used polyethylene products or resin (so-called burrs) generated during the manufacturing process of polyethylene products.

[0024] The substrates 11 and 21 may contain components other than polyethylene resin. Examples of such components include polyamide, polyethylene terephthalate, polypropylene, polyvinyl alcohol, and biodegradable resin materials (e.g., polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, casein, modified starch, etc.). The substrates 11 and 21 may contain additives such as antistatic agents, ultraviolet absorbers, plasticizers, lubricants, and colorants. The amount of components other than polyethylene resin in the substrates 11 and 21 is preferably 15% by mass or less, and more preferably 10% by mass or less, based on the total amount of the substrates 11 and 21.

[0025] [Sealant layer] The sealant layers 12, 22 are made of polyethylene resin or polypropylene resin, just like the base materials 11, 21. That is, the sealant layers 12, 22 are made of the same material as the base materials 11, 21. Note that the term "same material" as used here means that the main resin (e.g., polyethylene resin) is the same, and also includes cases where the components contained other than the main resin are different. The thickness of the sealant layers 12, 22 is, for example, 40 to 150 μm, and may be 20 to 250 μm. The polyethylene resin film constituting the sealant layers 12, 22 is a film that has been given easy tearing properties in the machine direction.

[0026] The polyethylene resin constituting the sealant layers 12, 22 with such easy-tear properties is preferably, for example, C4-LLDPE. C4-LLDPE is a type of LLDPE (linear low-density polyethylene) composed of a copolymer of ethylene and 1-butene, and has a molecular structure in which a 4-carbon side chain derived from 1-butene is attached to the ethylene-derived LLDPE main chain. C4-LLDPE has shorter side chains and a lower melt flow rate (MFR) than C6-LLDPE and C8-LLDPE, and therefore has relatively low tensile impact strength, tensile strength, and tensile modulus. Therefore, using C4-LLDPE as the polyethylene resin constituting the sealant layers 12, 22 makes it possible to easily impart easy-tear properties to the sealant layers 12, 22 in the machine direction.

[0027] The melt flow rate (MFR) of the sealant layers 12, 22 is less than 5 g / 10 min, preferably 0.5 g / 10 min or more but less than 5 g / 10 min, and more preferably 2 g / 10 min or more but less than 5 g / 10 min. A melt flow rate of less than 5 g / 10 min increases the melt tension, which has the effect of making it easier to suppress wrinkles during processing such as by inflation. In other words, the sealant layers 12, 22 are somewhat less likely to flow when heated to melt them, allowing for a smooth, transparent film.

[0028] The melting point of the sealant layers 12, 22 is, for example, in the range of 100 to 170° C., preferably 120° C. or less, and more preferably 95 to 110° C. The sealant layers 12, 22 have a density of 0.925 g / cm 3 Less than (more preferably 0.900 to 0.920 g / cm 3 As an example, the above-mentioned linear low-density polyethylene (LLDPE) can be used, and very low-density polyethylene (VLDPE) or a blend of LLDPE and VLDPE may also be used as long as it can impart easy tearing properties to the sealant layers 12, 22 in the machine direction.

[0029] Biomass polyethylene, which uses biomass-derived ethylene as a raw material, may be used as part or all of the polyethylene constituting the sealant layers 12, 22. Such a sealant film is disclosed, for example, in JP 2013-177531 A. The sealant layers 12, 22 contain mechanically recycled polyethylene made from used polyethylene products or resin (so-called burrs) generated during the manufacturing process of polyethylene products. In other words, the first laminate film 10 and the second laminate film 20 contain recycled materials as raw materials.

[0030] [Other layers] The first laminate film 10 and the second laminate film 20 may have an adhesive layer (not shown) between the substrate 11, 21 and the sealant layer 12, 22. The adhesive forming the adhesive layer can be selected depending on the bonding method, and a urethane adhesive, a polyester adhesive, or the like can be used. By providing such an adhesive layer, the interlayer adhesion between the substrate 11, 21 and the sealant layer 12, 22 is increased, making delamination less likely, and the pressure resistance and impact resistance of the pouch can be maintained.

[0031] The adhesive layer preferably does not contain chlorine. The absence of chlorine in the adhesive layer can prevent the adhesive or recycled resin from becoming discolored or from generating odors due to heat treatment. From an environmental perspective, it is preferable to use a biomass material for the adhesive layer. Furthermore, biomass polyethylene can be used for the polyethylene. From an environmental perspective, it is preferable that the adhesive does not contain a solvent.

[0032] The first laminate film 10 and the second laminate film 20 may further include a gas barrier layer, for example, from the viewpoint of improving gas barrier properties against water vapor and oxygen. The gas barrier layer may be provided between the substrate 11, 21 and the sealant layer 12, 22, or may be provided on the surface of the substrate 11, 21 opposite to the sealant layer 12, 22. The water vapor permeability of the laminate is, for example, 5 g / m 2 day, 1g / m2 ·day or less or 0.5g / m 2 The oxygen permeability of the first laminate film 10 and the second laminate film 20 may be, for example, 1 cc / m 2 ·atm·day and 0.5g / m 2 ·atm·day or less or 0.2g / m 2 By including a gas barrier layer in the first laminate film 10 and the second laminate film 20, the contents are protected from deterioration due to water vapor and oxygen, making it easier to maintain quality over the long term.

[0033] An example of a gas barrier layer is a vapor-deposited layer of an inorganic oxide. By using a vapor-deposited layer of an inorganic oxide, high barrier properties can be achieved with a very thin layer that does not affect the recyclability of the laminate. Examples of inorganic oxides include aluminum oxide, silicon oxide, magnesium oxide, and tin oxide. From the viewpoint of transparency and barrier properties, the inorganic oxide may be selected from the group consisting of aluminum oxide, silicon oxide, and magnesium oxide. The thickness of the vapor-deposited layer of an inorganic oxide can be, for example, 5 nm to 100 nm, or 10 nm to 50 nm. A thickness of 5 nm or more facilitates the exertion of good barrier properties, while a thickness of 100 nm or less facilitates the maintenance of flexibility of the laminate. The vapor-deposited layer can be formed, for example, by physical vapor deposition, chemical vapor deposition, or the like.

[0034] The first laminate film 10 and the second laminate film 20 may include a metal layer (metal foil) instead of or in addition to the inorganic oxide vapor deposition layer. Various metal foils made of aluminum, stainless steel, etc. can be used as the metal layer. Among these, aluminum foil is preferred from the viewpoints of moisture resistance, processability such as ductility, cost, etc. Ordinary soft aluminum foil can be used as the aluminum foil. Among these, iron-containing aluminum foil is preferred from the viewpoints of pinhole resistance and ductility during molding. When a metal layer is provided, its thickness may be 7 to 50 μm or 9 to 15 μm from the viewpoints of barrier properties, pinhole resistance, processability, etc.

[0035] The first laminate film 10 and the second laminate film 20 may have an anchor coat layer between the substrate 11, 21 and the sealant layer 12, 22. The anchor coat layer may be a very thin layer that does not affect the recyclability of the laminate film, and can be formed using an anchor coat agent. Examples of anchor coat agents include acrylic resins, epoxy resins, acrylic urethane resins, polyester polyurethane resins, polyether polyurethane resins, and polyvinyl alcohol resins. From the viewpoints of heat resistance and interlayer adhesive strength, acrylic urethane resins and polyester polyurethane resins are preferred as anchor coat agents.

[0036] The first laminate film 10 and the second laminate film 20 may further include, for example, a printed layer. The printed layer may be provided between the substrate 11, 21 and the sealant layer 12, 22, or may be provided on the surface of the substrate 11, 21 opposite the sealant layer 12, 22. When a printed layer is provided, it is preferable to use a printing ink that does not contain chlorine, from the viewpoint of preventing the printed layer from becoming discolored or generating an odor when remelted. Furthermore, from the viewpoint of environmental consideration, it is preferable to use a biomass material as the compound contained in the printing ink.

[0037] [Pour section] The configuration of the spout portion 5 of the packaging bag 1 will be described. Fig. 3 is an enlarged front view showing the vicinity of the spout of the packaging bag shown in Fig. 1. As shown in Figs. 1 and 3, the spout portion 5 includes a spout 51, a tab portion 52, a first spout seal portion 53, a second spout seal portion 54, a connecting seal portion 55, a notch 56, and a half-cut line 57.

[0038] The spout 51 is a portion through which the contents contained in the storage section 2 are poured out. For example, after a predetermined content has been placed in the packaging bag 1, the contents are poured out of the packaging bag 1 from the spout 51 by cutting off the tab 52 during refilling or the like. The contents are extracted from the opening 51a of the spout 51. The spout 51 is an area surrounded by the sealant layers 12, 22 that are not welded to each other, and is provided adjacent to the seal portion 4a of the injection section 4.

[0039] Tab 52 is a portion that is grasped (graspable) by the user when opening spout 5. For example, tab 52 is a gripping portion that the user pulls on spout 5 when opening spout 5 to transfer the contents contained in storage section 2. Tab 52 is sealed on three sides except for the side of spout 51. By pulling tab 52 in the direction of arrow A along half-cut line 57, opening 51a of spout 51 opens, and spout 5 is opened. Tab 52 has protruding portion 52a that protrudes toward the outside of packaging bag 1, and tab 52 is designed to be pulled from the outside toward the inside.

[0040] The first pouring seal portion 53 is a seal portion provided on the outer edge side of the packaging bag 1 and extending in the vertical direction, with its upper end connected to the tab portion 52 and its lower end connected to the first seal portion 3a via a connecting seal portion 55. The second pouring seal portion 54 is a seal portion provided more inward than the first pouring seal portion 53 and extending in the vertical direction, with its upper end connected to the tab portion 52 and its lower end connected to the seal portion 4a of the injection portion 4 via a curved portion. The first pouring seal portion 53 and the second pouring seal portion 54 are portions where the sealant layers of the first laminate film 10 and the second laminate film 20 are sealed together, similar to the first seal portion 3a and the second seal portion 3b.

[0041] The notch 56 is the part that serves as the starting point for opening the spouting portion 5, and is a part that guides the user when opening the spouting portion 5. The notch 56 is provided in the knob portion 52. The notch 56 may have the shape of a cut, a notch, a depression, or the like.

[0042] As shown in FIG. 3, the notch 56 includes a first side 56a extending at an angle relative to the height direction and a second side 56b extending in a direction intersecting the direction in which the first side 56a extends. In the following description, the height direction will be referred to as direction D1, the direction in which the first side 56a extends, i.e., the direction inclined relative to the height direction, will be referred to as direction D2, and the direction in which the second side 56b extends, i.e., the direction intersecting the direction in which the first side 56a extends, will be referred to as direction D3. In the example shown in FIG. 3, direction D3 is perpendicular to direction D1. That is, in the example shown in FIG. 3, the second side 56b extends in the left-right direction.

[0043] The first side 56a and the second side 56b intersect at, for example, an acute angle. That is, the angle θ formed by the first side 56a and the second side 56b is, for example, an acute angle. The angle θ is, for example, not less than 45° and not more than 80°, preferably not less than 60° and not more than 80°, and in this embodiment, for example, is 72°.

[0044] In the packaging bag 1, the first side 56a has a height direction component h2 that is equal to or greater than a predetermined ratio of the height h1 of the tab portion 52. The height h1 is determined, for example, by the distance between the height position of one end 56a1 of the first side 56a and the height position of the tip of the tab portion 52. The height direction component h2 is determined, for example, by the distance between one end 56a1 and the other end 56a2 of the first side 56a in the direction D1.

[0045] The predetermined percentage may be, for example, 100% or 50%. In this embodiment, the predetermined percentage is 68%. The height h1 may be, for example, 10 mm or more and 50 mm or less. The height direction component h2 may be, for example, 10 mm or more and 50 mm or less. In this embodiment, the height h1 is 17.0 mm, and the height direction component h2 is 11.5 mm.

[0046] The half-cut line 57 is a linear notch extending from one end 52b of the knob portion 52 to the other end 52c, and defines the opening 51a of the spout 51. The half-cut line 57 is provided such that one end 57a is located on the first side 56a. In this embodiment, the half-cut line 57 is provided such that the one end 57a is located on the first side 56a above point P1 where the first side 56a and the second side 56b intersect. That is, in this embodiment, the height position of the one end 57a is located higher than the height position of point P1.

[0047] The height position of the one end 57a above the height position of point P1 may be set based on, for example, a machining error when forming the half-cut line 57 and the notch 56. For example, if the machining error is ME, the height position of the one end 57a may be higher than the height position of point P1 by 1.2 times or more of the machining error ME, or may be higher than the height position of point P1 by 1.5 times or more of the machining error ME. That is, the difference between the height positions of the one end 57a and point P1 may be equal to or greater than a predetermined threshold value based on the machining error ME. In this embodiment, the height position of the one end 57a is higher than the height position of point P1 by 2.0 mm or more. That is, the half-cut line 57 is formed so that the one end 57a is located on the first side 56a at a position 2.0 mm or more above point P1, where the first side 56a and the second side 56b intersect.

[0048] As described below, the half-cut line 57 is a portion where a laser cut is made partway through the thickness direction (stacking direction) of the first laminate film 10 or the second laminate film 20. Such half-cut line 57 assists in cutting when a user grips the tab portion 52 of the packaging bag 1 and tries to cut it off. The half-cut line 57 may be provided on at least one of the first laminate film 10 and the second laminate film 20, or one may be provided on each of the first laminate film 10 and the second laminate film 20. The number of half-cut lines 57 may be one or two or more. When the packaging bag 1 is formed from the first laminate film 10 and the second laminate film 20 having the same mono-material configuration, the number of half-cut lines 57 is preferably one.

[0049] As described above, in the packaging bag 1 according to this embodiment, the notch 56 extends at an angle with respect to the direction D1 and includes the first side 56a having a height component h2 that is equal to or greater than a predetermined percentage of the height h1 of the tab portion 52. Since the first side 56a has a height component h2 that is equal to or greater than a predetermined percentage of the height h1, a sufficient tolerance for misalignment in the direction D1 can be ensured. Furthermore, in the packaging bag 1 according to this embodiment, the half-cut line 57 is provided above the point P1 where the first side 56a and the second side 56b intersect, with one end 57a positioned on the first side 56a. Thus, since the half-cut line 57 is provided as described above on the first side 56a that has a sufficient tolerance for misalignment in the direction D1, even if a processing error occurs in the process of providing the half-cut line 57 or the notch 56, the processing error can be absorbed by the height component h2 of the first side 56a. That is, in the packaging bag 1 according to this embodiment, misalignment is unlikely to occur between the half-cut line 57 and the notch 56. As a result, even if a processing error occurs, it is possible to prevent a decrease in the easy-open properties.

[0050] In the packaging bag 1, the angle θ formed by the first side 56a and the second side 56b is equal to or greater than 45° and equal to or less than 80°. In this case, the ease of opening can be improved.

[0051] In the packaging bag 1, the half-cut line 57 is provided 2.0 mm or more above the point P1 where the first side 56a and the second side 56b intersect, with one end 57a positioned on the first side 56a. In this case, misalignment between the half-cut line 57 and the notch 56 is even less likely to occur. As a result, even if a processing error occurs, deterioration in the easy-openability can be further suppressed.

[0052] The packaging bag 1 is formed by sealing a first laminate film 10 including a substrate and a sealant layer made of the same material with a second laminate film 20 including a substrate and a sealant layer made of the same material. In this case, a mono-material structure can be achieved while suppressing a decrease in ease of opening.

[0053] In the packaging bag 1, the first laminate film 10 and the second laminate film 20 contain recycled materials as materials. In this case, even in a packaging bag formed by the first laminate film 10 and the second laminate film 20 containing recycled materials as materials, it is possible to suppress a decrease in easy-openability.

[0054] Next, a method for manufacturing the packaging bag 1 will be described with reference to Fig. 4. Fig. 4 is a diagram showing steps for manufacturing the packaging bag shown in Fig. 1. In the method for manufacturing the packaging bag 1 according to this embodiment, first, a packaging bag 1 including a storage section 2 and a spout section 5 including a spout 51 and a tab section 52 is prepared (step S1 in Fig. 4). Here, in step S1, the packaging bag 1 prepared does not have a notch 56 or a half-cut line 57. In one example, step S1 includes steps S11 to S14, which will be described later. Hereinafter, the above example of preparing the packaging bag 1 will be described.

[0055] When preparing the packaging bag 1, first, a first laminate film 10 having a substrate 11 and a sealant layer 12 made of the same material (monomaterial), and a second laminate film 20 having a substrate 21 and a sealant layer 22 made of the same material (monomaterial) are prepared (step S11 in FIG. 4). The first laminate film 10 and the second laminate film 20 are also made of the same material. As described above, the substrate 11 and the sealant layer 12 of the first laminate film 10 and the substrate 21 and the sealant layer 22 of the second laminate film 20 are formed from, for example, a polyethylene resin or a polypropylene resin. FIG. 4 shows a roll 100 in which the first laminate film 10 and the second laminate film 20 are wound together.

[0056] Next, once preparation of the first laminate film 10 and the second laminate film 20 (placing the roll 100 in the designated location) is completed, the first laminate film 10 and the second laminate film 20 are each pulled out from the roll 100 and heated (preheated) by the heater 101, as shown in step S12 of Figure 4.

[0057] 4, the first laminate film 10 and the second laminate film 20 are overlapped (laminated) so that the sealant layer 12 of the first laminate film 10 and the sealant layer 22 of the second laminate film 20 face each other. Thereafter, the side portions of the first laminate film 10 and the second laminate film 20 corresponding to the first sealed portion 3a and the second sealed portion 3b of the packaging bag 1 are heat-sealed by a heat sealer 102. Thereafter, the heat-sealed laminate is cooled by a cooling mechanism 103.

[0058] 4, the top and bottom ends of the first laminate film 10 and the second laminate film 20 corresponding to the third seal portion 3c, the seal portion 4a, the first pour-out seal portion 53, the second pour-out seal portion 54, and the connecting seal portion 55 of the packaging bag 1 are heat-sealed by a heat sealer 104. The heat-sealed laminate is then cooled by a cooling mechanism 105. This prepares a packaging bag 1 including the storage portion 2 and the pour-out portion 5 including the pour-out spout 51 and the tab portion 52. The heat-sealing in step S13 and the heat-sealing in step S14 may be performed simultaneously, or step S13 may be performed after step S14.

[0059] Further, as shown in step S2 of FIG. 4, a half-cut line 57 that defines the opening 51a of the spout 51 is formed using a laser 106. For example, the half-cut line 57 is formed in at least one of the heat-sealed first laminate film 10 and second laminate film 20. As described above, the half-cut line 57 is a linear notch that cuts each laminate film partway through the thickness direction, and for example, cuts from the outer surface to the adhesive layer between the base material and the sealant layer of the laminate film. The laser 106 used to form such half-cut line 57 is, for example, a carbon dioxide laser. The scanning speed of the laser 106 when forming the half-cut line 57 may be, for example, 200 mm / sec to 1200 mm / sec, which is slower than the scanning speed of the laser when forming half-cut lines in a multi-layer laminate, which is 3000 mm / sec to 4000 mm / sec. The scanning speed of the laser 106 when forming the half-cut lines 57 may be, for example, 200 mm / sec to 500 mm / sec, or 500 mm / sec to 1000 mm / sec.

[0060] Next, as shown in step S3 of FIG. 4, a notch 56 including a first side 56a and a second side 56b having a height direction component h2 is formed in the grip portion 52 by a punching device 107. At this time, the notch 56 is formed above a point P1 where the first side 56a and the second side 56b intersect, so that one end 57a of the half-cut line 57 is positioned on the first side 56a. For example, the notch 56 is formed 2.0 mm or more above the point P1 where the first side 56a and the second side 56b intersect, so that one end 57a is positioned on the first side 56a. The punching device 107 is configured to include a blade such as a Thomson blade.

[0061] Next, as shown in step S4 of Figure 4, the first laminate film 10 and the second laminate film 20, which have been heat-sealed to each other, are punched by a punching device 108 so as to have the outer shape shown in Figure 1. Note that the punching devices 107 and 108 may be the same punching device or may be separate punching devices. The punching process in step S3 and the punching process in step S4 may be performed simultaneously, or step S3 may be performed after step S4. Since the punching process is a conventional method and will be clear to those skilled in the art, a detailed description will be omitted. In this manner, the packaging bag 1 shown in Figure 1 is formed.

[0062] As described above, in the manufacturing method of the packaging bag 1 according to this embodiment, the notch 56 is provided so that the first side 56a has a height component h2 that is equal to or greater than a predetermined percentage of the height h1 of the tab 52. Since the first side 56a of the notch 56 has a height component h2 that is equal to or greater than a predetermined percentage of the height h1 of the tab 52, a sufficient tolerance for misalignment in the direction D1 can be ensured. Furthermore, in the manufacturing method of the packaging bag 1 according to this embodiment, the notch 56 is provided above point P1 where the first side 56a and the second side 56b intersect, such that one end 57a of the half-cut line 57 is positioned on the first side 56a. By providing the notch 56, including the first side 56a that has a sufficient tolerance for misalignment in the direction D1, as described above, even if a processing error occurs in the process of providing the half-cut line 57 or the notch 56, the processing error can be absorbed by the height component h2 of the first side 56a. That is, in the manufacturing method of packaging bag 1 according to this embodiment, misalignment is unlikely to occur between half-cut line 57 and notch 56. As a result, even if processing errors occur, it is possible to prevent a decrease in easy-openability.

[0063] For example, when the packaging bag 1 is formed from the first laminate film 10 and the second laminate film 20 of the same mono-material composition, the materials constituting the first laminate film 10 and the second laminate film 20 may have lower laser absorption than conventional materials. In this case, it is necessary to increase the absorption by, for example, slowing down the laser scanning speed. Therefore, forming multiple half-cut lines 57 significantly increases the formation time, reducing manufacturing efficiency. On the other hand, reducing the number of half-cut lines 57 to shorten the formation time can result in a problem of reduced ease of opening if misalignment occurs between the half-cut lines 57 and the notches 56, as described above. In contrast, with the manufacturing method for the packaging bag 1 according to this embodiment, as described above, misalignment between the half-cut lines 57 and the notches 56 is unlikely to occur. Therefore, even when the number of half-cut lines 57 formed is reduced, the deterioration of ease of opening is suppressed. As a result, it is possible to suppress a deterioration in ease of opening while suppressing a deterioration in manufacturing efficiency.

[0064] Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment.

[0065] In the above embodiment, the spout 51 is provided in a corner portion of the packaging bag 1, but this is not limiting. For example, the spout 51 may be provided in another portion, such as the center of the upper end of the packaging bag 1.

[0066] In the above embodiment, for example, an embossment, which is a convex portion, may be provided in the region of first laminate film 10 and second laminate film 20 corresponding to spout 51. By providing such an embossment, even if sealant layers 12, 22 are adhered to each other on the inner surface due to laser processing when forming half-cut line 57 in spout portion 5, it is possible to prevent spout 51 from closing and ensure the opening function of spout 51. When providing an embossment, for example, in step S12, first laminate film 10 and second laminate film 20 may be heated by heater 101, and then an embossing device may be pressed against each of the heated first laminate film 10 and second laminate film 20, thereby providing the embossment.

[0067] In the above embodiment, the packaging bag 1 is formed of a first laminate film including a substrate and a sealant layer made of the same material, and a second laminate film including a substrate and a sealant layer made of the same material, but this is not limiting. For example, instead of the first laminate film 10 and the second laminate film 20, a multi-material laminate film including a substrate made of a material with high laser absorption, such as PET or nylon, and a sealant layer made of polyolefin, may be used. [Example]

[0068] The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the following examples.

[0069] Example 1 As Example 1, five packaging bags 1 having the configuration shown in FIG. 1 were produced by the manufacturing method shown in FIG. 4. In producing the packaging bag 1, the laser scanning speed when forming the half-cut line 57 was set to 700 mm / sec. The laser used was a carbon dioxide gas laser (ML-Z9510 (30 W), manufactured by Keyence Corporation), and the output was 80% at all scanning speeds (corresponding to 24 W, which is 80% of the output of the device, 30 W). Only one half-cut line 57 was formed. In Example 1, as an example of a case where no misalignment occurred between the half-cut line 57 and the notch 56, the notch 56 was formed 2.0 mm above point P1, with one end 57a positioned on the first side 56a.

[0070] <Example 2> In Example 2, as an example of a case where a misalignment occurs between the half-cut line 57 and the notch 56, five packaging bags 1 having the configuration shown in Figure 1 were produced in the same manner as in Example 1, except that the notch 56 was provided so that there was a misalignment of 3.0 mm from the position of the half-cut line 57.

[0071] <Comparative Example 1> As Comparative Example 1, five packaging bags 1A having the configuration shown in FIG. 5 were produced. The packaging bag 1A differs from the packaging bag 1 described above in the configuration of the spout portion 5. The packaging bag 1A includes a spout portion 5A instead of the spout portion 5. Specifically, the spout portion 5A includes a notch 56A instead of the notch 56, and the notch 56A includes a side 56Aa extending at an angle with respect to the direction D1. Note that in the packaging bag 1A, the notch 56A does not include a side corresponding to the second side 56b. In Comparative Example 1, the packaging bag 1A was produced so that the side 56Aa had a height direction component h3 that was smaller than a predetermined ratio with respect to the height h1 of the tab portion 52. In the packaging bag 1A, the height direction component h3 was determined, for example, by the distance between one end 56Aa1 and the other end 56Aa2 of the side 56Aa in the direction D1.

[0072] In producing the packaging bag 1A, the laser scanning speed when forming the half-cut line 57 was set to 700 mm / sec. The laser used was a carbon dioxide gas laser (ML-Z9510 (30 W), manufactured by Keyence Corporation), and the output was 80% at all scanning speeds (corresponding to 24 W, which is 30 W x 80% of the output of the device). Only one half-cut line 57 was formed. In Comparative Example 1, as an example of a case where no misalignment occurred between the half-cut line 57 and the notch 56, the half-cut line 57 was formed so that one end 57a was positioned on one end 56Aa1 of the first side 56a.

[0073] <Comparative Example 2> In Comparative Example 2, as an example of a case where a misalignment occurs between the half-cut line 57 and the notch 56, five packaging bags 1A having the configuration shown in Figure 5 were produced in the same manner as in Comparative Example 1, except that the notch 56 was provided so that there was a misalignment of 3.0 mm from the position of the half-cut line 57.

[0074] A sensory evaluation was carried out by five people regarding the ease of opening of the packaging bags 1 produced in Examples 1 and 2 and the ease of opening of the packaging bags 1A produced in Comparative Examples 1 and 2. The evaluation results of the sensory evaluation are shown in Table 1 below.

[0075] [Table 1]

[0076] In Table 1, a rating of "A (good)" means that the spout 5 could be easily opened. A rating of "B (fair)" means that more force was required to open the spout 5 than for rating "A", but it was possible to open it. A rating of "C (poor)" means that the spout 5 could not be opened.

[0077] As shown in Table 1, it can be seen that with the packaging bag 1, even when misalignment occurred between the half-cut line 57 and the notch 56 (Example 2), all five people were able to open the spouting portion 5. On the other hand, with the packaging bag 1A, when misalignment occurred between the half-cut line 57 and the notch 56 (Comparative Example 2), three out of the five people were unable to open the spouting portion 5. From these results, it was confirmed that the notch 56 includes the first side 56a having the height direction component h2, and the half-cut line 57 is provided above point P1 so that one end 57a is located on the first side 56a, thereby suppressing a decrease in ease of opening. [Explanation of symbols]

[0078] 1...packaging bag, 2...storage section, 5...pouring section, 10...first laminated film, 11, 21...base material, 12, 22...sealant layer, 20...second laminated film, 51...pouring outlet, 52...grip section, 57a...one end, 56a...first side, 56b...second side, 56...notch, 57...half-cut line, D1, D2, D3...direction, h1...height, h2...height direction component, P1...point.

Claims

1. a storage section capable of storing a predetermined item; a pouring portion that can pour out the contents when the container is opened, The pouring portion is A pouring outlet through which the contents are poured; a knob portion that can be grasped by a user when opening the pouring portion; a notch provided in the knob portion; a half-cut line that defines the opening of the spout; The notch is a first side that extends at an angle with respect to the height direction and has a height direction component that is equal to or greater than a predetermined ratio with respect to the height of the knob portion; a second side extending in a direction intersecting the direction in which the first side extends, The half-cut line is provided above the point where the first side and the second side intersect, with one end of the half-cut line positioned on the first side.

2. The packaging bag according to claim 1 , wherein the angle formed between the first side and the second side is equal to or greater than 45° and equal to or less than 80°.

3. The packaging bag according to claim 1 or 2, wherein the half-cut line is provided at least 2.0 mm above the point where the first side and the second side intersect, with the one end positioned on the first side.

4. The packaging bag according to claim 1 or 2, wherein the packaging bag is formed by sealing a first laminate film including a substrate and a sealant layer made of the same material and a second laminate film including a substrate and a sealant layer made of the same material.

5. The packaging bag according to claim 4 , wherein the first laminate film and the second laminate film contain recycled materials as materials.

6. A process of preparing a packaging bag including a storage section capable of storing a predetermined content and a spout section from which the content can be poured when the bag is opened, the spout section including a spout through which the content is poured and a grip section that can be grasped by a user when opening the spout; providing a half-cut line that defines the opening of the spout; providing a notch in the tab portion, the notch including a first side that extends at an angle with respect to the height direction and has a height component with respect to the height of the tab portion that is equal to or greater than a predetermined ratio, and a second side that extends in a direction intersecting the direction in which the first side extends, In the step of forming the notch, the notch is formed above the point where the first side and the second side intersect so that one end of the half-cut line is positioned on the first side.

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