Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
  • B65D75/52—Details
  • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
  • B65D75/5861—Spouts
  • B65D75/5872—Non-integral spouts
  • B65D75/5883—Non-integral spouts connected to the package at the sealed junction of two package walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D2575/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
  • B65D2575/52—Details
  • B65D2575/58—Opening or contents-removing devices added or incorporated during package manufacture
  • B65D2575/583—Opening or contents-removing devices added or incorporated during package manufacture the non-integral spout having an elongate cross-sectional shape, e.g. canoe or boat shaped

Definitions

• paragraph 0010 of Patent Document 1 describes use of a laminate film in which a sealant such as polyethylene (PE) or polypropylene (PP) is laminated with a stretched film such as polyethylene terephthalate (PET), nylon (Ny), or PP.
• paragraph 0011 describes that the spout has a thermoplastic resin layer that can be welded to the sealant of the packaging bag, and that PE, PP, PET, Ny, or the like can be used.
• Patent Document 1 Japanese Unexamined Patent Application, First Publication No. 2006-7630
• the present invention has been made in view of the above circumstances, and an objective of the present invention is to provide a spout and a packaging container that have excellent weldability even for a mono-material packaging bag formed of a polyethylene-based resin or the like.
• the first aspect of the present invention is a spout to be welded to a packaging bag and including an attachment part welded to the packaging bag, and a pouring part protruding from the attachment part to the outside of the packaging bag, in which an outer peripheral part of the attachment part welded to the packaging bag has four or more ribs, each having a width of 1 mm or more, which are parallel to each other in a direction in which the pouring part protrudes from the attachment part. That is, the ribs are disposed to be aligned at intervals from each other in a direction in which the pouring part protrudes from the attachment part.
• the ribs are preferably parallel to each other, but need not be strictly parallel as long as a gap is provided between them.
• the third aspect is, in the first or second aspect, characterized in that at least the outer peripheral part of the attachment part is formed of a polyethylene-based resin. Thereby, the surface of the rib welded to the packaging bag is formed of a polyethylene-based resin.
• the fourth aspect is, in any one of the first to third aspects, characterized in that the packaging bag is formed of a laminated film having two or more layers of resin films (resin layers), and the two or more layers of resin films (resin layers) are formed only of a polyethylene-based resin.
• the polyethylene-based resins forming the respective resin films (resin layers) may be completely the same or different in composition from each other.
• the fifth aspect is a packaging container having a packaging bag to which a spout according to any one of the aspects 1 to 4 is welded.
• the sixth aspect is, in the fifth aspect, characterized in that the packaging bag is formed of a laminated film having two or more layers of resin films (resin layers), and the two or more layers of resin films (resin layers) are formed only of a polyethylene-based resin.
• the present invention it is possible to provide a spout and a packaging container that have excellent thermal weldability even for a mono-material packaging bag.
• FIG. 1 illustrates a spout 10 according to an embodiment.
• FIG. 2 illustrates a part in which the spout 10 is welded to a packaging bag 20.
• the spout 10 in the illustrated example is welded to the packaging bag 20 to be used in a packaging container having the spout 10 and the packaging bag 20.
• the spout 10 in the illustrated example has an attachment part 12 having an outer peripheral part 13 that is welded to the packaging bag 20 and a pouring part 11 that protrudes from the attachment part 12 to the outside of the packaging bag 20.
• the attachment part 12 is disposed along an end edge part 20a of the packaging bag 20.
• the pouring part 11 is cylindrical and has a flow path therein through which contents of the packaging bag 20 can be poured out.
• the flow path inside the spout 10 is formed to penetrate from a base part 12a of the attachment part 12 to a tip part 11a of the pouring part 11.
• the flow path of the spout 10 opens toward an internal space 20b of the packaging bag 20 at the base part 12a side.
• a shape of the pouring part 11 is not particularly limited, and may be, for example, a cylindrical shape, an elliptical cylindrical shape, a rectangular cylindrical shape, or the like.
• a lid member such as a cap may be attached to the pouring part 11.
• a flange part 17, a male thread part 18, and the like may be formed on an outer circumferential surface of the pouring part 11. If the male thread part 18 is provided on the pouring part 11, a female thread part is provided on the lid member.
• a method of attaching the lid member to the pouring part 11 is not limited to the screw connection, and may be fitting, engagement, or the like.
• a protruding direction of the pouring part 11 is a direction in which the pouring part 11 protrudes from the attachment part 12, from the base part 12a of the attachment part 12 toward the tip part 11a.
• the flow path is formed straight from the base part 12a to the tip part 11a, and the protruding direction of the pouring part 11 is a vertical direction in FIGS. 1 and 2 .
• the pouring part 11 stands vertically upright from a center of an upper surface of the base part 12a.
• a boundary part 12b between the pouring part 11 and the attachment part 12 is formed in a stepped shape.
• a cross-sectional shape of the attachment part 12 on a plane orthogonal to the protruding direction of the pouring part 11 is larger than a cross-sectional shape of the pouring part 11.
• the attachment part 12 may have the same cross-sectional shape as the pouring part 11.
• the pouring part 11 and the attachment part 12 may be cylindrical with substantially the same diameter.
• a cross-sectional shape of the attachment part 12 is not particularly limited, and examples of the cross-sectional shape on a plane orthogonal to the protruding direction of the pouring part 11 include, for example, a circular shape, an elliptical shape, a boat shape, and the like.
• the boat shape refers to a shape in which, in a plan view of the attachment part 12, both end parts in a longitudinal direction of the attachment part 12 protrude in a substantially triangular shape toward respective protruding parts 16, and both side surfaces of the attachment part 12 are curved in a substantially arc shape.
• the attachment part 12 is thickest in a minor axis direction at a central part in a major axis direction.
• the major axis direction is a left-right direction in FIG. 1
• the minor axis direction is a left-right direction in FIG. 2 .
• a cross-sectional shape of the flow path inside the spout 10 is not particularly limited, and examples of the cross-sectional shape on a plane orthogonal to the protruding direction of the pouring part 11 include, for example, a circular shape, an elliptical shape, a polygonal shape, and the like.
• An inner surface of the flow path may be concentric with an outer surface of the pouring part 11.
• the inside of the flow path may be a single space, or may be partitioned into a plurality of spaces (flow paths) via a partition wall or the like extending in a longitudinal direction of the pouring part 11.
• a shape of the flow path in the protruding direction of the pouring part 11 is not particularly limited, and may be linear, curved, arcuate, bent, or the like.
• the same flow path may branch into two or more on a distal end side of the pouring part 11.
• a distal end of the flow path of the spout 10 may open toward a lateral side of the pouring part 11 instead of opening at the tip part 11a of the pouring part 11.
• the pouring part 11 may not protrude linearly and vertically from the attachment part 12, the pouring part 11 may protrude at an inclination from an upper surface of the attachment part 12, or the pouring part 11 may be curved in the longitudinal direction thereof. Regardless of whether a central axis of the pouring part 11 is linear or not, a circumferential edge of the boundary part 12b is preferably disposed to be coplanar with the end edge part 20a of the packaging bag 20.
• the spout 10 of the embodiment has a plurality of ribs 14 on the outer peripheral part 13 of the attachment part 12.
• a gap part 15 is disposed between the ribs 14.
• a surface 14a of the rib 14 facing the packaging bag 20 protrudes more than the gap part 15.
• the number of the plurality of ribs 14 that are parallel to each other in the protruding direction of the pouring part 11 is four or more. The number may be any number of four or more, but is preferably four to six, and more preferably four to five.
• the ribs 14 in this example extend in parallel along the boundary part 12b between the pouring part 11 and the attachment part 12. As a result, after the spout 10 is welded to the packaging bag 20, the ribs 14 extend in parallel along the end edge part 20a of the packaging bag 20.
• Each rib 14 preferably extends over the entire length of the side surface of the pouring part 11 between the left and right protruding parts 16. Although the ribs 14 are preferably parallel to each other, they do not need to be strictly parallel as long as a gap is provided between them.
• a width of each rib 14 may be constant in a longitudinal direction of the rib 14, or, instead of being constant, there may be a shape such that, for example, the width varies periodically in the longitudinal direction of the rib 14.
• a welding method of the spout 10 is not particularly limited, and a heating member may be placed on an outer side of the packaging bag 20 to heat an area between the packaging bag 20 and the spout 10 so that a part of a resin thereof melts.
• Specific examples of the welding method include heat sealing, ultrasonic sealing, high-frequency sealing, impulse sealing, and the like.
• a packaging material 23 forming the packaging bag 20 is welded to the surface 14a of each rib 14, a plurality of seal parts are formed along the end edge part 20a of the packaging bag 20. Thereby, the contents (not illustrated) housed in the internal space 20b of the packaging bag 20 are sealed in a liquid-tight manner without leaking from the welded part between the spout 10 and the packaging bag 20.
• the packaging bag 20 is formed of mono-material materials having a relatively low melting point such as a polyethylene-based resin.
• the packaging bag 20 is formed of the thin packaging material 23 such as a resin film, whereas the spout is formed of a thick molded product. That is, this is thought to be because an outer surface of the spout is less likely to melt, excessive heat is applied to the packaging bag 20 before the welding is completed, and the packaging material 23 tends to melt first.
• the outer peripheral part 13 of the attachment part 12 has a smooth surface without the uneven structure due to the ribs 14 and gap parts 15, heat and pressure during welding are more likely to be applied uniformly over the entire outer peripheral part 13. Therefore, it can be said that the outer peripheral part 13 is less likely to melt, making welding defects more likely to occur.
• the same is considered to apply to a case in which the number of ribs 14 formed on the outer peripheral part 13 is one. If there is only one rib 14 and a width of the rib is large, there is also a problem that sink marks are likely to occur during molding.
• the heat and pressure applied during welding are concentrated on the surfaces 14a of the two ribs 14.
• the heat and pressure applied during welding are distributed across the surfaces 14a of the three ribs 14.
• the surfaces 14a of the ribs 14 may not be aligned on the same plane.
• the heating temperature is high, it is easy to deform a part of the ribs 14 by melting, but there is a likelihood that the packaging bag 20 will melt excessively. If the heating temperature is low, there is a likelihood that the heat and pressure may be unevenly applied to the three ribs 14. Particularly, if welding becomes unstable at the two ribs 14 on the base part 12a side and the boundary part 12b side, there is a likelihood of welding defects unless liquid tightness is ensured solely by the single intermediate rib 14.
• the number of ribs 14 formed on the outer peripheral part 13 is four or more, in addition to the two ribs 14 on the base part 12a side and the boundary part 12b side, two or more ribs 14 are disposed to be aligned between them. Therefore, even if there are factors that hinder uniform welding such as uneven heights of the surfaces 14a of the ribs 14, it is possible to weld at least two ribs 14. The liquid tightness can be ensured with two or more ribs 14.
• a width of each rib 14 in the protruding direction of the pouring part 11 is preferably 1 mm or more. If the width of the rib 14 is too small, the seal part becomes too thin, making it difficult to obtain satisfactory sealing properties.
• An upper limit value of the width of the rib 14 is not particularly limited, and the width of the rib 14 may be 3 mm or less, or 2 mm or less.
• the surface 14a of each rib 14 is preferably flat in a width direction of the rib 14, it may be slightly chamfered at both ends in the width direction of the rib 14, or may be slightly curved in a convex or concave manner in the width direction of the rib 14.
• a width of the gap part 15 is not limited, it is preferably 1 mm or more and 7 mm or less, and may be 2 mm or more and 6 mm or less.
• an area ratio of the gap part 15 to the entire side surface of the attachment part 12 is not limited, it may be 20% or more and 85% or less, and may be 40% or more and 70% or less. When the area ratio falls within these ranges, a temperature of the rib 14 rises quickly during sealing, facilitating welding, and a strength after welding is also satisfactory. After the welding, a distal end of the rib 14 may be melted and fused to the packaging bag 20. After the seal part is formed, a slight gap may be formed between the gap part 15 and an inner surface of the packaging bag 20, or a recess caused by the gap part 15 may be filled with a seal material.
• the surface 14a of the rib 14 facing the packaging bag 20 have a satin finish applied thereto.
• the satin finish is a process in which minute irregularities are formed on the surface 14a, and the surface 14a may be randomly roughened by sanding, blasting, or the like, or irregularities may be transferred by embossing or the like using a mold having an irregular surface complementary to the desired satin finish.
• the mold surface configured to form the ribs 14 may be subjected to a satin finish. With such a satin finish, an anchor effect on the seal material after welding can be enhanced, thereby improving a welding strength.
• the spout 10 is preferably formed of a polyolefin-based resin such as a polyethylene-based resin or a polypropylene-based resin.
• a method for forming the spout 10 is not particularly limited, and examples thereof include injection molding, extrusion molding, and the like.
• a molding resin for the spout 10 is not particularly limited, and examples of the polyethylene-based resins include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and the like, and examples of the polypropylene-based resins include propylene homopolymer, block copolymer, random copolymer, and the like.
• HDPE high-density polyethylene
• MDPE medium-density polyethylene
• LDPE low-density polyethylene
• LLDPE linear low-density polyethylene
• examples of the polypropylene-based resins include propylene homopolymer, block copolymer, random copolymer, and the like.
• the spout 10 may be formed of a single type of resin, or may be formed by blending or laminating two or more types of resins. At least a part of the resin used for the spout 10 may be a recycled resin obtained from a used resin. At least the outer peripheral part 13 of the attachment part 12 is preferably formed of a polyethylene-based resin or a polypropylene-based resin.
• an inner surface of the flow path disposed in the pouring part 11 and the attachment part 12 may be formed of an appropriate material different from the outer peripheral part 13 of the attachment part 12 such as a cyclic olefin-based resin.
• the packaging material 23 forming the packaging bag 20 may be formed of a single type of resin, or may be formed by blending or laminating two or more types of resins. At least one of the resins used in the packaging material 23 is preferably a polyolefin-based resin. At least a part of the resin used for the packaging bag 20 may be a recycled resin obtained from a used resin.
• the packaging material 23 may include a plurality of resin films such as, for example, a sealant 21 and a base material 22.
• a resin film contained in the packaging material 23 is preferably formed of only a polyolefin-based resin, and more preferably formed of only a polypropylene-based resin or a polyethylene-based resin.
• the resin film contained in the packaging material 23 may be formed of only a polyethylene-based resin.
• Examples of materials for the sealant 21 include a polyolefin-based resin such as a polyethylene-based resin and a polypropylene-based resin.
• a polyolefin-based resin such as a polyethylene-based resin and a polypropylene-based resin.
• specific examples include LLDPE, LDPE, and the like.
• a material forming the sealant 21 may be a single type of resin or a blend of two or more types of resins.
• a thickness of the sealant 21 is not particularly limited, and may be, for example, about 60 to 180 ⁇ m.
• a material of the base material 22 is not particularly limited, and examples thereof include a resin, paper, cellophane, a metal foil, and the like.
• a resin of the base material 22 is not particularly limited, and examples thereof include a polyolefin-based resin such as a polyethylene-based resin and a polypropylene-based resin, a polyester-based resin such as PET, a polyamide resin such as Ny, and the like.
• a polyolefin-based resin such as a polyethylene-based resin or a polypropylene-based resin for the base material 22.
• a resin film such as, for example, LLDPE, LDPE, MDPE, HDPE, and PP.
• a thickness of the base material 22 is not particularly limited, and may be, for example, about 10 to 50 ⁇ m in terms of a thickness of each layer or a total thickness.
• the base material 22 may include a stretched resin film.
• a stretched resin film for example, as illustrated in FIG. 3 , when a laminated film 40 serving as the packaging material 23 includes a sealant resin film 41, an intermediate resin film 42, and an outer resin film 43, it is preferable to use a stretched resin film for the intermediate resin film 42 adjacent to the sealant resin film 41.
• the intermediate resin film 42 is preferably a uniaxially or biaxially stretched polyethylene-based resin film.
• a stretching direction, a stretching ratio, and the like of the stretched resin film are not particularly limited, and the film may be stretched in a machine direction (MD) or a transverse direction (TD).
• the stretching ratio is preferably within a range of two to ten in both the MD direction and the TD direction.
• the stretching ratio in the MD direction and the stretching ratio in the TD direction may be equal to or different from each other.
• a biaxially stretched polyethylene-based resin film may be used for the intermediate resin film 42, and a uniaxially stretched polyethylene-based resin film may be used for the outer resin film 43.
• the sealant resin film 41 may be an unstretched polyethylene-based resin film.
• the layers in the packaging material 23 such as the laminated film 40 may be laminated via adhesive layers 44 and 45 by dry lamination, sandwich lamination, or the like.
• a plurality of resin films may be laminated by co-extrusion, thermal lamination, extrusion lamination, or the like while omitting the adhesive layers 44 and 45. It is also possible for the same laminated film 40 to use both a lamination with the adhesive layers 44 and 45 interposed between the layers and a lamination without the adhesive layers 44 and 45 interposed between the layers.
• urethane-based compounds epoxy-based compounds, isocyanate-based compounds, polyethyleneimine, organic titanium compounds such as titanium alkoxides, and the like may be used.
• the adhesive layers 44 and 45 are formed using an extruded resin, for example, a polyolefin-based resin such as a polyethylene-based resin and a polypropylene-based resin, or an adhesive resin such as a modified resin may be used.
• a polyolefin-based resin such as a polyethylene-based resin and a polypropylene-based resin
• an adhesive resin such as a modified resin
• a printed layer, a vapor deposition layer, or the like may be formed on at least one surface of each resin film.
• the printed layer may be formed using a solvent-based ink, or may be formed without a solvent using a curable ink such as an electron beam-curable ink or ultraviolet-curable ink.
• the vapor deposition layer may be formed of a metal such as aluminum, or an inorganic compound such as silica or alumina.
• a metal foil may be laminated onto a resin film. In mono-material packaging, only a thin vapor deposition layer may be used without using a metal foil, or the vapor deposition layer may also be omitted.
• the sealant 21 and the base material 22, particularly the sealant resin film 41 and the intermediate resin film 42, may be laminated only via the adhesive layers 44 and 45 without forming a printed layer or a barrier layer.
• a printed layer or a barrier layer may be laminated inside the base material 22, for example, between the intermediate resin film 42 and the outer resin film 43.
• a polyolefin-based resin used for the spout 10, the packaging material 23, the laminated film 40, and the like may be a homopolymer of a specific olefin, or a copolymer mainly composed of a specific olefin.
• ethylene serves as the specific olefin
• propylene serves as the specific olefin.
• a propart of the specific olefin in constituent monomers is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. In homopolymers, a propart of the specific olefin in constituent monomers is substantially about 100% by weight. In copolymers, monomers other than the specific olefin are copolymerized in an appropriate propart.
• Examples of monomers used in the polyolefin-based polymers include one or more of ⁇ -olefins such as ethylene, propylene, 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl-based monomers such as vinyl acetate, vinyl chloride, and acrylic acid.
• ⁇ -olefins such as ethylene, propylene, 1-butene, 1-hexene, and 1-octene
• cyclic olefins such as norbornene
• vinyl-based monomers such as vinyl acetate, vinyl chloride, and acrylic acid.
• These monomers may be derived from fossil resources such as petroleum or may be derived from biomass such as plants. At least a part of the monomers may be monomers obtained by recycling used resins.
• the resin used for the spout 10 and/or the packaging bag 20 may contain other resins and/or additives within an appropriate range.
• Additives for the resin are not particularly limited, and examples thereof include antioxidants, lubricants, anti-blocking agents, flame retardants, ultraviolet absorbers, light stabilizers, antistatic agents, colorants, cross-linking agents, and the like.
• a molded product (the spout 10 or resin film) mainly composed of a polyolefin-based resin may contain a resin other than the polyolefin-based resin in an appropriate propart.
• a molded product (the spout 10 or resin film) mainly composed of a polyethylene-based resin may contain a resin other than the polyethylene-based resin in an appropriate propart.
• the packaging material 23 such as the laminated film 40 be also mainly composed of the polyethylene-based resin.
• a propart of the polyethylene-based resin contained in the spout 10 and/or the packaging bag 20 is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight.
• the packaging bag 20 is formed of the packaging material 23 such as the laminated film 40 having two or more layers of resin films
• the two or more layers of resin films may be formed of only a polyethylene-based resin.
• a total amount of the specific resin be 80% by weight or more and a total amount of materials other than the specific resin be 20% by weight or less with respect to the total weight of these, and it is more preferable that a total amount of the specific resin be 90% by weight or more and a total amount of materials other than the specific resin be 10% by weight or less.
• the specific resin for example, any one of a polyethylene-based resin, a polypropylene-based resin, and a polyolefin-based resin may be selected.
• FIGS. 4 and 5 illustrate specific examples of packaging containers 31 and 32 using the packaging bag 20 in a form of a standing pouch. In these figures, illustration of the ribs 14 of the attachment part 12 is omitted.
• the packaging bag 20 used for the packaging containers 31 and 32 is formed by sandwiching a bottom member 26 between a pair of packaging materials 23 that form a body member 24.
• the bottom member 26 is folded in half and disposed at a lower part of the body member 24.
• body seal parts 25 are formed on the left and right sides to join the front and rear body members 24 together.
• the bottom member 26 is joined to the body member 24 by a bottom seal part 27.
• the spout 10 is adhered upward at a center part of an upper seal part 28, and the inside of the packaging bag 20 is sealed.
• an opening 29 is formed at an upper part of the body member 24, adjacent to one of the body seal parts 25.
• a part of the upper seal part 28 is formed obliquely, and the spout 10 is adhered obliquely.
• An attachment orientation of the spout 10 with respect to the vertical direction of the packaging bag 20 is not particularly limited, and can be selected from any suitable orientation such as upward, obliquely upward, horizontal, or downward. Two or more spouts 10 may be attached to the same packaging bag 20.
• a height in the vertical direction may be about 100 to 500 mm
• a width in the left-right direction may be about 70 to 300 mm
• a filling volume may be about 100 cm 3 to 5000 cm 3 .
• a state of the contents housed in the packaging bag 20 is not particularly limited, and examples thereof include fluids such as liquids, powders, and granules, or solids such as articles.
• Types of the contents are not particularly limited, and examples thereof include detergents, medicines, cosmetics, pharmaceutical products, beverages, seasonings, inks, paints, fuels, and the like.
• a method of recycling the spout 10 or the packaging bag 20 of the embodiment after use is not particularly limited, and can be appropriately selected according to a state or the like at the time of collection. According to the embodiment, since a propart of the polyolefin-based resin can be increased, both chemical recycling and mechanical recycling are possible. Through recycling, it can also be recycled into products of the same type such as the spout 10 or the packaging bag 20. Materials obtained by recycling may be utilized in products such as paints, molded products, and hydrocarbon oils.
• spouts of comparative examples 1 to 4 and examples 1 and 2 were produced as shown in Table 1 by varying the number of ribs, widths of the ribs, and presence or absence of a satin finish.
• Table 1 a sum of a width of one rib and a width of one gap part was 2.8 mm when a width of the rib was 0.7 mm, 3.0 mm when a width of the rib was 1.0 mm, and 3.3 mm when a width of the rib was 1.4 mm.
• a sum of a width of one rib and a width of one gap part was 4.3 mm (width of the rib:1.4 mm).
• a shape of the attachment part was a boat shape in a plan view, a dimension of the attachment part in the longitudinal direction was 35 mm, a maximum thickness in a width direction of the attachment part in a plan view was 18 mm, and a height of the side surface of the attachment part was 10 mm.
• an outer circumferential surface of the attachment part to be sealed with the packaging bag was inspected for a presence of sink marks. Formability of the spout was evaluated as good ( ⁇ ) when there was no sink marks, and as poor ( ⁇ ) when sink marks were present.
• a laminated film having a three-layer structure of 25 ⁇ m uniaxially stretched polyethylene/25 ⁇ m biaxially stretched polyethylene/150 ⁇ m sealant polyethylene laminated by dry lamination was used as the packaging material used for producing the packaging bag.
• the laminated film was overlapped on the outer circumferential surface of the spout and sealed for 0.5 seconds using a mold at a predetermined temperature (135°C or 140°C), after which an appearance of the seal part was inspected and a seal strength was measured.
• the appearance of the seal part was evaluated as good ( ⁇ ) when there were no holes in the laminated film at the seal part, and as poor ( ⁇ ) when holes were ascertained.
• the seal strength was evaluated as good ( ⁇ ) if the laminated film did not peel off at an interface with the spout and did not break between a seal part and an unsealed part even when a tensile force within a practical range was applied, and as poor ( ⁇ ) if the strength was insufficient due to peeling or breaking.
• the spouts of examples 1 and 2 were excellent in both formability and sealing properties.

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