Spouts and containers

Abstract

To prevent a base material of a pouch from being damaged due to heat seal.SOLUTION: A spout attached to a pouch comprises a cylindrical part having a hollow cylindrical shape, and an attachment part which spreads outward in a radial direction of the cylindrical part from an outer peripheral surface of the cylindrical part and is joined to the pouch. The spout is composed of a polyethylene-based resin composition. The polyethylene-based resin composition contains HDPE and one or more kinds of low density resins selected from a group consisting of LLDPE and LDPE. A content of the HDPE in the polyethylene-based resin composition is 30 mass% or more. A density of the polyethylene-based resin composition is 0.900 g / cm3 or more and 0.947 g / cm3 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a spout attached to a pouch, and to a container comprising a pouch and a spout. [Background technology]

[0002] Pouches are used as containers for storing fluid contents such as liquids and powders. For example, Patent Document 1 discloses a container including a pouch and a spout. The spout has a tubular portion with a through hole that communicates with the inside of the pouch. Attaching the spout to the pouch makes it easier to take out the contents.

[0003] The pouch is composed of a laminate including a substrate and a sealant layer. In recent years, there has been a demand for recycling pouches. From the viewpoint of recycling, it is preferable that the substrate and the sealant layer include the same type of resin material. For example, Patent Document 2 proposes that the substrate and the sealant layer be composed of polyethylene. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-7002 A [Patent Document 2] JP 2020-55156 A Summary of the Invention [Problem to be solved by the invention]

[0005] The spout is attached to the pouch, for example, by heat sealing, a method of joining two members by applying pressure and heat to the two members to melt their surfaces.

[0006] If the substrate of the pouch is constructed from polyethylene, the substrate may be damaged due to the heat sealing that occurs when the spout is attached to the pouch.

[0007] An object of the present invention is to provide a spout and a container that can effectively solve these problems. [Means for solving the problem]

[0008] The present invention provides a spout that is attached to a pouch that contains a flowable content, comprising: A tube portion having a hollow cylindrical shape; An attachment portion that extends outward in a radial direction of the cylindrical portion from an outer peripheral surface of the cylindrical portion and is joined to the pouch, The spout is made of a polyethylene resin composition, The polyethylene resin composition comprises HDPE and one or more low-density resins selected from the group consisting of LLDPE and LDPE, The content of the HDPE in the polyethylene resin composition is 30% by mass or more, The density of the polyethylene resin composition is 0.900 g / cm 3 More than 0.947g / cm 3 Below is the spout.

[0009] In the spout according to the present invention, the polyethylene resin composition has a viscosity of 0.910 g / cm 3 The polyethylene resin composition may include a first LLDPE having a density of less than 20 mass %, and the content of the first LLDPE in the polyethylene resin composition may be 20 mass % or more.

[0010] In the spout according to the present invention, the content of the low-density resin in the polyethylene resin composition may be 30% by mass or more.

[0011] The spout according to the present invention may have a hardness of 30 N or more in a radial direction of the cylindrical portion.

[0012] The present invention relates to a pouch that is composed of a laminate including an outer surface and an inner surface opposite to the outer surface and that contains a content having flowability; a spout attached to the pouch; a cap attached to the spout; The spout comprises a tube portion having a hollow cylindrical shape, and an attachment portion extending outward in a radial direction of the tube portion from an outer circumferential surface of the tube portion and joined to the pouch, The laminate comprises a substrate including a polyethylene film, and a sealant layer located on the inner surface side of the substrate and including a polyethylene film; The spout is made of a polyethylene resin composition, The polyethylene resin composition comprises HDPE and one or more low-density resins selected from the group consisting of LLDPE and LDPE, The content of the HDPE in the polyethylene resin composition is 30% by mass or more, The density of the polyethylene resin composition is 0.900 g / cm 3 More than 0.947g / cm 3 Below is the container. Effect of the Invention

[0013] According to the present invention, damage to the base material caused by heat sealing can be suppressed. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a front view showing an example of a container according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of a spout and a cap. [Diagram 3] FIG. 2 is a cross-sectional view showing an example of a spout. [Figure 4] FIG. 4 is a plan view of the spout of FIG. 3. [Diagram 5] FIG. 4 is a bottom view of the spout of FIG. 3. [Figure 6] FIG. 2 is a cross-sectional view showing an example of a layer structure of a laminate. [Figure 7] FIG. 2 is a cross-sectional view showing an example of a layer structure of a substrate. [Figure 8] FIG. 2 is a cross-sectional view showing an example of a layer structure of a substrate. [Figure 9] FIG. 2 is a cross-sectional view showing an example of a layer structure of a substrate. [Figure 10] The method for measuring the seal strength will now be described. [Figure 11] The method for measuring the seal strength will now be described. [Figure 12] The method for measuring the seal strength will now be described. [Figure 13] This explains how to measure the hardness of a spout. [Figure 14] 1 shows the evaluation results of the spouts of Examples 1 to 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of the present invention will be described below. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of illustration and ease of understanding.

[0016] As used in this specification, terms that specify shapes, geometric conditions, and the extent thereof, such as "parallel," "orthogonal," and "same," as well as values ​​of lengths and angles, are not limited to their strict meanings, but are interpreted to include a range within which similar functions can be expected.

[0017] In this specification, when multiple upper limit candidates and multiple lower limit candidates are given for a certain parameter, the numerical range of the parameter may be formed by combining any one of the upper limit candidates and any one of the lower limit candidates. For example, consider a case where "parameter B may be, for example, A1 or more and may be A2 or more. Parameter B may be, for example, A3 or less and may be A4 or less." In this case, the numerical range of parameter B may be A1 or more and A3 or less, A1 or more and A4 or less, A2 or more and A3 or less, or A2 or more and A4 or less.

[0018] container 1 is a front view showing a container 1 according to the present embodiment. Container 1 is configured to contain fluid contents such as liquids. The contents may be beverages such as juice, fruit juice, jelly drinks, and nutritional drinks, seasonings, and various other foods and beverages.

[0019] The container 1 comprises a pouch 10 and a spout 20. The pouch 10 includes an upper portion 11, a lower portion 12, and a side portion 13. The upper portion 11 and the lower portion 12 may extend in a first direction D1. The side portion 13 may extend in a second direction D2 intersecting the first direction D1. The second direction D2 may be perpendicular to the first direction D1. In this case, the pouch 10 has a generally rectangular outline in a front view.

[0020] Spout 20 is attached to upper portion 11 of pouch 10 by heat sealing. Note that names such as "upper portion," "lower portion," and "side portion," as well as terms such as "above" and "below" merely indicate the relative positions and directions of pouch 10 and its components based on the position of spout 20. The position of pouch 10 during transportation or use is not limited by the names and terms used in this specification.

[0021] 1, spout 20 is attached to the center of upper portion 11 in first direction D1. Although not shown, spout 20 may be attached to pouch 10 at a position other than the center of upper portion 11. For example, spout 20 may be attached to pouch 10 at an end of upper portion 11. The end of upper portion 11 may be inclined with respect to the first direction.

[0022] The container 1 may comprise a cap 30 attached to the spout 20. The cap 30 is attached to the spout 20, for example by means of screws.

[0023] The pouch 10 includes a surface film 14 constituting the surface and a back film 15 constituting the back surface. Both the surface film 14 and the back film 15 are composed of a laminate including a base material and a sealant layer. The terms "surface film" and "back film" merely indicate that each film is divided according to its positional relationship, and the method of providing the laminate when manufacturing the pouch 10 is not limited by the above-mentioned terms. For example, the pouch 10 may be manufactured using one laminate in which the surface film 14 and the back film 15 are continuously provided. For example, the pouch 10 may be manufactured using one laminate constituting the surface film 14 and one laminate constituting the back film 15.

[0024] The pouch 10 includes a storage section 17 and a sealed section 19. The storage section 17 stores the contents. The sealed section 19 is made of a laminate melted by heat sealing or a part of a spout 20. The sealed section 19 includes a first sealed section 19a and a second sealed section 19b. The first sealed section 19a is formed by joining the inner surface of the laminate constituting the front film 14 and the inner surface of the laminate constituting the back film 15. The second sealed section 19b is formed by joining the inner surface of the laminate constituting the front film 14 or the inner surface of the laminate constituting the back film 15 and the spout 20. In plan views such as FIG. 1, the sealed section 19 is hatched.

[0025] 1, the seal portion 19 includes an upper seal portion 11a extending along the upper portion 11, a lower seal portion 12a extending along the lower portion 12, and a side seal portion 13a extending along the side portion 13. The upper seal portion 11a includes a first seal portion 19a and a second seal portion 19b. The lower seal portion 12a and the side seal portion 13a include the first seal portion 19a.

[0026] Although not shown, the pouch 10 may be a gusset-type pouch. For example, the pouch 10 may include an intermediate film that is located between the front film 14 and the back film 15 in the folded state. The intermediate film may be located in the lower portion 12 or in the side portion 13.

[0027] The spout 20 and the cap 30 will now be described. Fig. 2 is a cross-sectional view showing an example of the spout 20 and the cap 30. Fig. 3 is a cross-sectional view showing an example of the spout 20.

[0028] The spout 20 includes a cylindrical portion 21 and an attachment portion 23. The spout 20 may include a flange portion. The spout 20 may include a protrusion 26.

[0029] The tube portion 21 has a hollow cylindrical shape. The tube portion 21 includes a first end 211 and a second end 212 located on the opposite side of the first end 211. The first end 211 is located outside the pouch 10. The second end 212 overlaps the pouch 10. A through hole 21a is formed on the inner side of the tube portion 21 in the radial direction of the tube portion 21, the through hole 21a extending from the first end 211 to the second end 212. The contents contained in the pouch 10 are poured out through the through hole 21a. A screw thread 22 is formed on the outer peripheral surface of the tube portion 21.

[0030] The outer diameter W1 of the cylindrical portion 21 in the radial direction is, for example, 8 mm or more, and may be 10 mm or more. The outer diameter W1 of the cylindrical portion 21 is, for example, 20 mm or less, and may be 15 mm or less.

[0031] The thickness T1 of the cylindrical portion 21 is, for example, 1.0 mm or more, and may be 1.5 mm or more. The thickness T1 of the cylindrical portion 21 is, for example, 3.0 mm or less, and may be 2.0 mm or less.

[0032] Attachment portion 23 includes an attachment surface that is joined to pouch 10. Fig. 5 is a bottom view of spout 20 of Fig. 3. Attachment portion 23 protrudes outward from cylindrical portion 21 in the radial direction of cylindrical portion 21. Spout 20 may include a pair of attachment portions 23 that face each other in first direction D1.

[0033] 5, the symbol W2 indicates the distance between the radially outer ends of the pair of mounting portions 23. The distance W2 is, for example, 15 mm or more, and may be 20 mm or more. The distance W2 is, for example, 30 mm or less, and may be 25 mm or less.

[0034] The mounting surface of the mounting portion 23 includes a first mounting surface 231 joined to the inner surface of the front film 14, and a second mounting surface 232 joined to the inner surface of the back film 15. In Fig. 5, symbol D3 indicates a third direction in which the front film 14 and the back film 15 face each other. A distance W3 between the first mounting surface 231 and the second mounting surface 232 in the third direction D3 may become smaller as the distance from the tube portion 21 increases in the first direction D1. For example, the first mounting surface 231 and the second mounting surface 232 may be curved so as to be convex toward the tube portion 21.

[0035] The flange portion extends outward in the radial direction from the cylindrical portion 21. The flange portion includes, for example, a first flange 24 and a second flange 25. The first flange 24 is connected to the mounting portion 23. The second flange 25 is located between the first end 211 of the cylindrical portion 21 and the first flange 24.

[0036] Fig. 4 is a plan view of spout 20 of Fig. 3. First flange 24 and second flange 25 may extend so as to surround tubular portion 21 over the entire circumference.

[0037] The contours of the first flange 24 and the second flange 25 in a plan view are arbitrary. For example, as shown in FIG. 4, the dimension of the first flange 24 in the first direction D1 may be larger than the dimension of the first flange 24 in the third direction D3. The dimension of the first flange 24 in the first direction D1 may be larger than the above-mentioned interval W2. The contour of the second flange 25 may be a substantially rectangular shape including a side extending in the first direction D1 and a side extending in the third direction D3. As shown in FIG. 4, the contour of the second flange 25 may be located inside the contour of the first flange 24.

[0038] The protrusions 26 are components for suppressing movement of the ring of the cap 30. The protrusions 26 protrude outward in the radial direction from the cylindrical portion 21. The spout 20 may include a pair of protrusions 26 facing each other in the first direction D1.

[0039] In this embodiment, the protrusion 26 is configured to contact a part of the ring of the cap 30 in the circumferential direction of the tubular portion 21. Although not shown, the protrusion 26 may be configured to contact a part of the ring of the cap 30 in the direction in which the tubular portion 21 extends.

[0040] Next, the cap 30 will be described. The cap 30 is a member that covers the tubular portion 21 at the first end 211. As shown in FIG. 2, the cap 30 includes an upper portion 301 and a side portion 302. The upper portion 301 faces the first end 211 of the tubular portion 21. The side portion 302 extends so as to surround the entire circumference of the tubular portion 21 in a plan view. A thread 32 that meshes with the thread 22 of the tubular portion 21 is formed on the inner surface of the side portion 302. The cap 30 may include a protrusion 31 that protrudes from the inner surface of the upper portion 301. The protrusion 31 may be in contact with the inner surface of the tubular portion 21.

[0041] The cap 30 may include a ring 33 connected to an end surface of the side portion 302 via a connecting portion 34. The ring 33 surrounds the entire circumference of the tube portion 21 in a plan view. If the cap 30 is tampered with, the connecting portion 34 breaks. The ring 33 and the connecting portion 34 function as a so-called pilfer-proof band.

[0042] 2, ring 33 includes protrusions 35 that protrude inward from ring 33 in the radial direction. In this embodiment, protrusions 35 are configured to contact protrusions 26 of spout 20 in the circumferential direction of tubular portion 21. In this case, when a consumer rotates cap 30, rotation of ring 33 stops at a position where protrusions 35 contact protrusions 26. When a consumer further rotates cap 30, connection portion 34 breaks.

[0043] Although not shown, protrusion 35 may be configured to contact protrusion 26 of spout 20 in the direction in which tubular portion 21 extends. In this case, when a consumer rotates cap 30 to move cap 30 upward, movement of ring 33 stops at a position where protrusion 35 contacts protrusion 26. When a consumer further rotates cap 30 to move cap 30, connecting portion 34 breaks.

[0044] Next, a description will be given of the layer structure of the laminate 40 that constitutes the front film 14 and the back film 15. FIG.

[0045] The laminate 40 includes an inner surface 40x and an outer surface 40y. The inner surface 40x is the surface that contacts the contents. The outer surface 40y is the surface located opposite the inner surface 40x. The laminate 40 includes at least a substrate 50 and a sealant layer 70. The sealant layer 70 is located on the inner surface 40x side relative to the substrate 50. The laminate 40 may include an adhesive layer 60. The adhesive layer 60 is located between the substrate 50 and the sealant layer 70. The laminate 40 shown in FIG. 6 includes the following components in order from the outer surface side to the inner surface side: Substrate / adhesive layer / sealant layer It can be said that the layer is equipped with the following. Note that " / " indicates the boundary between layers.

[0046] The laminate 40 may further include layers not shown in FIG. 6. For example, the laminate 40 may include a printed layer located between the substrate 50 and the sealant layer 70, for example, between the substrate 50 and the adhesive layer 60. The printed layer is a layer that provides product information and aesthetics to the pouch 10. The printed layer expresses letters, numbers, symbols, shapes, pictures, etc. As a material for forming the printed layer, ink for gravure printing or ink for flexographic printing can be used.

[0047] [Base material] The substrate 50 includes a polyethylene film. The substrate 50 may include a stretched polyethylene film stretched in a predetermined direction. The stretched polyethylene film may be a uniaxially stretched polyethylene film stretched in one predetermined direction. The stretched polyethylene film may be a biaxially stretched polyethylene film stretched in two predetermined directions.

[0048] The stretching ratio in the machine direction (MD) of the stretched polyethylene film is, for example, 2 times or more, and may be 3 times or more. The stretching ratio in the machine direction (MD) is, for example, 10 times or less, and may be 7 times or less. The stretching ratio in the transverse direction (TD) of the stretched polyethylene film is, for example, 2 times or more, and may be 3 times or more. The stretching ratio in the transverse direction (TD) is, for example, 10 times or less, and may be 7 times or less. By using a stretched polyethylene film, the printability and strength of the substrate 50 can be improved. In addition, the transparency of the substrate 50 can be improved.

[0049] In the manufacturing process of the stretched polyethylene film, first, polyethylene as a raw material is molded by melt extrusion molding to produce a polyethylene film. Then, the polyethylene film is stretched. In this way, a stretched polyethylene film is obtained. The melt extrusion molding method is, for example, an inflation molding method, a T-die molding method, etc. The melt flow rate (MFR) of the resin material is, for example, 0.5 g / 10 min or more, and may be 0.8 g / 10 min or more. The MFR is, for example, 20 g / 10 min or less, and may be 5 g / 10 min or less.

[0050] The thickness of the polyethylene film of the substrate 50 is, for example, 10 μm or more, may be 15 μm or more, or may be 20 μm or more. The thickness of the polyethylene film of the substrate 50 is, for example, 50 μm or less, may be 40 μm or less, or may be 30 μm or less. By having a thickness of 10 μm or more, the strength of the substrate 50 can be ensured.

[0051] The polyethylene of the substrate 50 is, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc. The substrate 50 may contain two or more of these polyethylenes. From the viewpoints of printability, strength, heat resistance, and stretchability, high density polyethylene and medium density polyethylene are preferred. From the viewpoint of stretchability, medium density polyethylene is more preferred.

[0052] In this application, HDPE has a hardness of 0.942 g / cm 3 MDPE means polyethylene having a density of 0.930 g / cm or more. 3 More than 0.942g / cm 3 LDPE means polyethylene having a density less than 0.930 g / cm 3 It means polyethylene having a density of less than 1000 mm. The density of polyethylene is measured according to the method specified in Method A of JIS K7112-1980 after annealing as specified in JIS K6760-1995.

[0053] The polyethylene film of the substrate 50 may contain a copolymer of ethylene and another monomer. Examples of the ethylene copolymer include copolymers of ethylene and an α-olefin having 3 to 20 carbon atoms, and examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. The polyethylene film of the substrate 50 may also contain a copolymer with vinyl acetate, acrylic ester, or the like.

[0054] As a raw material for obtaining polyethylene, biomass-derived ethylene may be used instead of ethylene obtained from fossil fuels. Such biomass-derived polyethylene is a carbon-neutral material. Therefore, the environmental impact of the pouch 10 can be further reduced. Such biomass-derived polyethylene can be produced, for example, by a method such as that described in JP 2013-177531 A. Also, commercially available biomass-derived polyethylene (for example, Green PE commercially available from Braskem) may be used.

[0055] The polyethylene content in the polyethylene film of the substrate 50 is, for example, 50% by mass or more, and may be 70% by mass or more.

[0056] The polyethylene film of the substrate 50 may be composed of a single layer containing polyethylene, or may have multiple layers containing polyethylene. A polyethylene film containing multiple layers can be produced by molding multiple types of polyethylene resins by a coextrusion method.

[0057] FIG. 7 is a cross-section showing an example of the substrate 50. The substrate 50 includes a first surface 51 and a second surface 52. The first surface 51 is a surface of the substrate 50 located on the outer surface 40y side, and the second surface 52 is a surface of the substrate 50 located on the inner surface 40x side. As shown in FIG. 7, the substrate 50 may include a first layer 501 and a second layer 502 arranged from the first surface 51 toward the second surface 52. In the example shown in FIG. 7, the first layer 501 and the second layer 502 are made of, for example, HDPE and MDPE.

[0058] For example, as shown in FIG. 8, the substrate 50 may include a first layer 501, a second layer 502, and a third layer 503 arranged from the first surface 51 to the second surface 52. In the example shown in FIG. 8, the first layer 501, the second layer 502, and the third layer 503 are made of, for example, HDPE, MDPE, and HDPE. The first layer 501 and the third layer 503 may be thinner than the second layer 502. The ratio of the thickness of the first layer 501 and the third layer 503 to the thickness of the second layer 502 may be, for example, less than 1.0 and may be 1 / 2 or less. This can improve the stretchability of the polyethylene film. The ratio of the thickness of the first layer 501 and the third layer 503 to the thickness of the second layer 502 may be, for example, 1 / 10 or more and may be 1 / 5 or more. This can improve the strength and heat resistance of the substrate 50.

[0059] For example, as shown in Fig. 9, the substrate 50 may include a first layer 501, a second layer 502, a third layer 503, a fourth layer 504, and a fifth layer 505 arranged from the first surface 51 to the second surface 52. In the example shown in Fig. 9, the first layer 501, the second layer 502, the third layer 503, the fourth layer 504, and the fifth layer 505 are made of, for example, HDPE, MDPE, LDPE, MDPE, and HDPE. The density of the LDPE of the third layer 503 is 0.900 g / cm 3 It may be less than.

[0060] The first layer 501 and the fifth layer 505 may be thinner than the second layer 502 and the fourth layer 504. The ratio of the thickness of the first layer 501 and the fifth layer 505 to the thickness of the second layer 502 and the fourth layer 504 may be, for example, less than 1.0, or 1 / 2 or less. This can improve the stretchability of the polyethylene film. The ratio of the thickness of the first layer 501 and the fifth layer 505 to the thickness of the second layer 502 and the fourth layer 504 may be, for example, 1 / 10 or more, or 1 / 5 or more. This can improve the strength and heat resistance of the substrate 50.

[0061] The third layer 503 may be thinner than the second layer 502 and the fourth layer 504. The ratio of the thickness of the third layer 503 to the thickness of the second layer 502 and the thickness of the fourth layer 504 may be, for example, less than 1.0 and may be 1 / 2 or less.

[0062] By forming the first surface 51 and the second surface 52 of the substrate 50 from HDPE, the heat resistance and dimensional stability of the substrate 50 can be improved. By reducing the thickness of the HDPE layer, the stretchability of the polyethylene film can be improved. By including multiple layers with different densities in the polyethylene film, the density difference between two adjacent layers can be reduced. This can improve the adhesion between the layers.

[0063] [Sealant Layer] The sealant layer 70 includes a polyethylene film. The polyethylene film of the sealant layer 70 is preferably an unstretched film. The term "unstretched" refers not only to a film that is not stretched at all, but also to a film that is slightly stretched due to tension applied during film formation.

[0064] The thickness of the polyethylene film of the sealant layer 70 is, for example, 50 μm or more, may be 60 μm or more, or may be 80 μm or more. The thickness of the polyethylene film of the sealant layer 70 is, for example, 200 μm or less, may be 150 μm or less, or may be 120 μm or less.

[0065] The polyethylene of the sealant layer 70 is, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc. The sealant layer 70 may contain two or more of these polyethylenes. The sealant layer 70 may contain a copolymer of ethylene and other monomers. From the viewpoint of heat sealability, it is preferable that the sealant layer 70 contains LDPE and LLDPE. From the viewpoint of impact resistance, it is preferable that the sealant layer 70 contains LLDPE. When the sealant layer 70 contains LDPE and LLDPE, the content (mass %) of LLDPE may be larger than the content (mass %) of LDPE. From the viewpoint of environmental load, it is preferable that these polyethylenes are derived from biomass.

[0066] The polyethylene content in the polyethylene film of the sealant layer 70 is, for example, 50% by mass or more, and may be 70% by mass or more. The polyethylene film of the sealant layer 70 may contain additives. Examples of the additives include crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and modifying resins.

[0067] [Adhesive layer] The adhesive layer 60 is a layer that adheres the film including the substrate 50 and the film including the sealant layer 70 by a dry lamination method. Examples of the adhesive include a polyvinyl acetate adhesive, a polyacrylic acid ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyether adhesive, a polyamide adhesive, a polyimide adhesive, an amino resin adhesive, a phenol resin adhesive, an epoxy adhesive, a urethane adhesive, a rubber adhesive, and a silicone adhesive.

[0068] The laminate 40 may be produced by extruding the resin material that constitutes the sealant layer 70 onto a film that includes the substrate 50. In this case, the adhesive layer 60 does not need to be provided.

[0069] In the present embodiment, both the substrate 50 and the sealant layer 70 of the laminate 40 contain polyethylene films. This increases the proportion of polyethylene in the laminate 40. This increases the recyclability of the laminate 40 and the pouch 10.

[0070] Next, the material constituting the spout 20 will be described. Conventionally, a spout 20 made of HDPE has been known. On the other hand, in the present embodiment, the base material 50 of the pouch 10 includes polyethylene. Polyethylene has a lower melting point than polypropylene. For this reason, when the spout 20 is made of HDPE, it is considered that the base material 50 may be damaged due to heat sealing when the spout 20 is attached to the pouch 10.

[0071] In order to prevent damage to the base material 50, it is possible to lower the heat sealing temperature. However, in this case, there is a possibility that the spout 20 cannot be melted properly. This may result in a decrease in the seal strength of the second seal portion 19b between the pouch 10 and the spout 20. If the seal strength of the second seal portion 19b is low, a problem may occur in which the contents penetrate into the second seal portion 19b.

[0072] In consideration of such problems, in the present embodiment, it is proposed to use LLDPE or LDPE in addition to HDPE to form the spout 20. The polyethylene resin composition that forms the spout 20 will be described in detail below.

[0073] The polyethylene resin composition includes HDPE and one or more low-density resins selected from the group consisting of LLDPE and LDPE. The polyethylene resin composition is configured so that its density is equal to or lower than a certain value. For example, the content of HDPE in the polyethylene resin composition is limited. This makes the melting point of the spout 20 lower than when the spout 20 is composed only of HDPE. This allows the heat sealing temperature to be lowered, thereby preventing damage to the substrate 50 caused by the heat sealing. In addition, the seal strength of the second seal portion 19b between the pouch 10 and the spout 20 can be ensured.

[0074] As mentioned above, HDPE has a density of 0.942 g / cm 3 LDPE means polyethylene having a density of 0.930 g / cm or more. 3 By "polyethylene" is meant polyethylene having a density less than 1000 MPa.

[0075] Let us explain about LLDPE. Linear low-density polyethylene is a copolymer of ethylene and α-olefins polymerized using a multi-site catalyst such as a Ziegler-Natta catalyst or a single-site catalyst such as a metallocene catalyst, and has a density of 0.930 g / cm. 3 It refers to those having less than 100% by mass. Therefore, it is a high-pressure ethylene homopolymer, and is distinguished from high-pressure low-density polyethylene (LDPE) that can be obtained by the conventionally known high-pressure radical polymerization method. The α-olefins that are monomers of linear low-density polyethylene have 3 or more carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-nonene, 4-methylpentene, 3,3-dimethylbutene, and mixtures thereof.

[0076] The single-site catalyst is a catalyst capable of forming a uniform active species, and is usually prepared by contacting a metallocene transition metal compound or a nonmetallocene transition metal compound with an activation cocatalyst. Compared with a multi-site catalyst, a single-site catalyst is preferable because it has a uniform active site structure and can polymerize a polymer having a high molecular weight and a highly uniform structure. As the single-site catalyst, it is particularly preferable to use a metallocene catalyst. The metallocene catalyst is a catalyst containing a transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, a cocatalyst, and if necessary, an organometallic compound and each catalyst component of a carrier.

[0077] In the above-mentioned transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, the cyclopentadienyl skeleton is a cyclopentadienyl group, a substituted cyclopentadienyl group, etc. The substituted cyclopentadienyl group has at least one substituent selected from a hydrocarbon group having 1 to 30 carbon atoms, a silyl group, a silyl-substituted alkyl group, a silyl-substituted aryl group, a cyano group, a cyanoalkyl group, a cyanoaryl group, a halogen group, a haloalkyl group, a halosilyl group, etc. The substituted cyclopentadienyl group may have two or more substituents, and the substituents may be bonded to each other to form a ring, such as an indenyl ring, a fluorenyl ring, an azulenyl ring, or a hydrogenated product thereof. The rings formed by bonding the substituents to each other may further have substituents.

[0078] In the transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, the transition metal may be zirconium, titanium, hafnium, etc., and zirconium and hafnium are particularly preferred. The transition metal compound usually has two ligands having a cyclopentadienyl skeleton, and it is preferred that the ligands having each cyclopentadienyl skeleton are bonded to each other by a bridging group. The bridging group may be an alkylene group having 1 to 4 carbon atoms, a silylene group, a substituted silylene group such as a dialkylsilylene group or a diarylsilylene group, or a substituted germylene group such as a dialkylgermylene group or a diarylgermylene group. The substituted silylene group is preferred.

[0079] In the transition metal compound of Group IV of the periodic table, representative ligands other than those having a cyclopentadienyl skeleton include hydrogen, hydrocarbon groups having 1 to 20 carbon atoms (such as alkyl groups, alkenyl groups, aryl groups, alkylaryl groups, aralkyl groups, and polyenyl groups), halogens, metaalkyl groups, and metaaryl groups.

[0080] The above-mentioned compounds of transition metals of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton can be used as the catalyst component either alone or in the form of a mixture of two or more kinds.

[0081] The co-catalyst refers to a catalyst that can effectively use the above-mentioned transition metal compound of Group IV of the periodic table as a polymerization catalyst or balance the ionic charge in a catalytically activated state. Examples of the co-catalyst include benzene-soluble aluminoxanes of organoaluminum oxy compounds and benzene-insoluble organoaluminum oxy compounds, ion-exchangeable layered silicates, boron compounds, ionic compounds consisting of cations containing or not containing active hydrogen groups and non-coordinating anions, lanthanoid salts such as lanthanum oxide, tin oxide, and phenoxy compounds containing a fluoro group.

[0082] The transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton may be used by being supported on a carrier of an inorganic or organic compound. The carrier is preferably a porous oxide of an inorganic or organic compound, specifically, an ion-exchangeable layered silicate such as montmorillonite, SiO 2 , Al 2 O 3 , MgO, ZrO 2 , TiO 2 , B 2 O 3 , CaO, ZnO, BaO, ThO 2 etc. or mixtures thereof.

[0083] Furthermore, examples of organometallic compounds that may be used as necessary include organoaluminum compounds, organomagnesium compounds, organozinc compounds, etc. Of these, organoaluminum compounds are preferably used.

[0084] The density of the polyethylene resin composition is, for example, 0.947 g / cm 3 Less than or equal to 0.942 g / cm 3 or less, 0.940 g / cm 3 or less, 0.938 g / cm 3 It may be the following.

[0085] The content of HDPE in the polyethylene resin composition is, for example, 80% by mass or less, may be 70% by mass or less, or may be 60% by mass or less.

[0086] The melting point of the spout 20 is, for example, 45° C. or more, and may be 55° C. or more. The melting point of the spout 20 is, for example, 200° C. or less, and may be 140° C. or less.

[0087] On the other hand, if the HDPE content in the spout 20 is too low, the hardness of the spout 20 decreases, and the spout 20 becomes more susceptible to deformation. In this case, defects such as overrun are more likely to occur. Overrun is a phenomenon in which the thread 32 of the cap 30 goes over the thread 22 of the cylindrical portion 21 when the cap 30 is further tightened after the first end 211 of the cylindrical portion 21 is in contact with the upper portion 301 of the cap 30.

[0088] In consideration of such problems, it is preferable that the content of HDPE in the polyethylene resin composition is equal to or greater than a certain value. The content of HDPE in the polyethylene resin composition is, for example, equal to or greater than 30% by mass, may be equal to or greater than 40% by mass, or may be equal to or greater than 50% by mass.

[0089] The polyethylene resin composition preferably has a density of at least a certain value. The density of the polyethylene resin composition is, for example, 0.900 / cm 3 More than 0.903g / cm 3 or more, 0.910 g / cm 3 or more, and may be 0.919 g / cm 3 It may be more than that.

[0090] Next, the low density resin will be described. In this application, the low density resin is LLDPE or LDPE.

[0091] LLDPE is 0.910g / cm 3 It may have a density of less than 0.910 g / cm 3 In the present application, the density of the sintered body may be 0.910 g / cm or more. 3 LLDPE having a density of less than 0.910 g / cm is also called first LLDPE. 3 LLDPE having a density equal to or greater than this is also referred to as the second LLDPE.

[0092] When the polyethylene resin composition contains the first LLDPE, even if the content of the first LLDPE is small, the density of the polyethylene resin composition is efficiently reduced. Therefore, when the polyethylene resin composition contains the first LLDPE, the lower limit of the content of the low-density resin in the polyethylene resin composition can be lowered. The content of the first LLDPE in the polyethylene resin composition is, for example, 20% by mass or more, and may be 30% by mass or more. The content of the first LLDPE in the polyethylene resin composition is, for example, 70% by mass or less, and may be 50% by mass or less.

[0093] When the polyethylene resin composition does not contain the first LLDPE, the content of the low-density resin in the polyethylene resin composition is, for example, 30% by mass or more, and may be 40% by mass or more. When the polyethylene resin composition does not contain the first LLDPE, the content of the low-density resin in the polyethylene resin composition is, for example, 70% by mass or less, and may be 50% by mass or less.

[0094] As a measuring instrument for measuring the density of the polyethylene resin composition, for example, an automatic specific gravity meter DSG-1 manufactured by Toyo Seiki Seisakusho can be used. As a measuring instrument for measuring the content of components such as HDPE, LDPE, and LLDPE in the polyethylene resin composition, for example, Crystallization Elution Fractionation (CEF) manufactured by Polymer Char can be used.

[0095] The material of the cap 30 may be the same as or different from the material of the spout 20. For example, the material of the cap 30 may contain, like the spout 20, 30% by mass or more of HDPE and 20% by mass or more of the first LLDPE or 30% by mass or more of the low-density resin.

[0096] Container manufacturing method Next, a method for manufacturing the container 1 will be described.

[0097] 〔Manufacturing method of spout〕 First, an example of a method for manufacturing the spout 20 will be described.

[0098] First, a polyethylene resin composition constituting the spout 20 is prepared. For example, HDPE pellets and low-density resin pellets are mixed in a predetermined ratio. Next, the mixed pellets are melted, and the molten resin is injected into the inside of a mold. The mold is then cooled to solidify the resin. In this manner, the spout 20 can be produced.

[0099] [Method for producing laminate] Next, an example of a method for manufacturing the laminate 40 will be described.

[0100] A polyethylene resin is prepared as the raw material of the substrate 50. When the polyethylene film includes multiple layers, multiple types of polyethylene resins are prepared. Next, a polyethylene film is produced by melt extrusion molding. Next, the polyethylene film is subjected to a stretching process. As a result, the stretched polyethylene film of the substrate 50 is obtained.

[0101] Next, the sealant layer 70 is produced. First, a polyethylene resin is prepared as the raw material of the sealant layer 70. Then, a polyethylene film is produced by melt extrusion molding. In this way, an unstretched polyethylene film of the sealant layer 70 is obtained.

[0102] Next, the substrate 50 and the sealant layer 70 are laminated via the adhesive layer 60 by a dry lamination method, thereby obtaining the laminate 40.

[0103] In the dry lamination method, an adhesive composition is first applied to one of the two films to be laminated. The applied adhesive composition is then dried to volatilize the solvent. The two films are then laminated via the dried adhesive composition. The two laminated films are then wound up and aged, for example, for 24 hours or more in an environment of 20°C or higher.

[0104] [Method of manufacturing pouch] The laminate 40 is cut into two pieces. This results in a front film 14 and a back film 15. Next, heat sealing is performed with the attachment portion 23 of the spout 20 disposed between the front film 14 and the back film 15. This forms the seal portions 19, including the upper seal portion 11a, the lower seal portion 12a, and the side seal portion 13a. The films joined together by heat sealing are then cut into an appropriate shape. This results in a pouch 10 with the spout 20 attached.

[0105] Next, the contents are filled into the storage section 17 of the pouch 10 through the spout 20. After that, the cap 30 is attached to the spout 20. In this manner, the container 1 in which the contents are stored and sealed is obtained.

[0106] In the present embodiment, the substrate 50 and sealant layer 70 of the laminate 40 of the pouch 10, and the spout 20 all contain polyethylene films. This allows the polyethylene content ratio in the container 1 to be increased, and therefore the recyclability of the container 1 can be improved.

[0107] Since the spout 20 contains a low-density resin in addition to HDPE, the melting point of the spout 20 is lower than when the spout 20 is composed of only HDPE. This makes it possible to suppress damage to the base material 50 caused by heat sealing. In addition, the seal strength of the second seal portion 19b between the pouch 10 and the spout 20 can be ensured.

[0108] The seal strength of the second seal portion 19b is, for example, 10 N or more, or may be 15 N or more, or 20 N or more, or may be 25 N or more. The seal strength of the second seal portion 19b is, for example, 42 N or less, or may be 40 N or less, or may be 35 N or less.

[0109] By including 30% by mass or more of HDPE in the spout 20, it is possible to ensure the hardness of the spout 20. This makes it possible to suppress the occurrence of overrun, for example.

[0110] The hardness of the spout 20 is, for example, 30 N or more, may be 40 N or more, may be 50 N or more, or may be 60 N or more. The hardness of the spout 20 is, for example, 70 N or less.

[0111] 10 to 12 are diagrams for explaining a method for measuring the seal strength of the second seal portion 19b. A Tensilon STA-1150 manufactured by A&D Corporation is used as the measuring device.

[0112] First, a part of the container 1 is cut out to prepare a test piece. FIG. 10 shows a test piece 80 for measuring the seal strength of the second seal portion 19b. The test piece 80 includes a pair of long sides 81 and short sides 82. The long side 81 extends along the direction in which the tubular portion 21 extends. The short side 82 extends in a direction perpendicular to the long side 81. The pair of long sides 81 face each other across the tubular portion 21 of the spout 20. The long side 81 includes a portion that overlaps the second seal portion 19b and a portion that overlaps the storage portion 17. The short side 82 overlaps the storage portion 17. The long side 81 and the short side 82 are formed by cutting the front film 14. The portion of the test piece 80 that overlaps the second seal portion 19b is joined to the spout 20. The back film 15 also has the same long side 81 and short side 82 formed thereon.

[0113] The length L1 of the long side 81 is determined so that the interval S, which will be described later, can be set to 50 mm. The length L2 of the test piece 80 overlapping the second seal portion 19b is 10 mm or more. The length L3 of the short side 82 is 15 mm.

[0114] FIG. 11 is a diagram for explaining a method for measuring the seal strength of the second seal portion 19b using a test piece 80. First, a short side 82 of the test piece 80 on the front film 14 is held by a first gripping tool 83. Also, a short side 82 of the test piece 80 on the back film 15 is held by a second gripping tool 84. Next, the gripping tools 83 and 84 are pulled in opposite directions at a speed of 300 mm / min, and the maximum value of the tensile force F1 (see FIG. 12) is measured. During the measurement, the posture of the tube portion 21 is maintained so that the direction in which the tube portion 21 extends is perpendicular to the direction of the tensile force F1. The symbol S represents the distance between the first gripping tool 83 and the second gripping tool 84 in the direction of the tensile force F1. FIG. 12 shows the change in the tensile force F1 with respect to the distance S. The distance S between the gripping tools 83 and 84 when pulling is started is 50 mm. When the tension is terminated, the distance S between the grippers 83, 84 is 70 mm.

[0115] The maximum value of the tensile force F1 is measured for the ten test pieces 80. The average of the maximum values ​​is calculated as the seal strength of the second seal portion 19b. The measurement is performed in an environment of a temperature of 25° C. and a relative humidity of 50%.

[0116] 13 is a diagram for explaining a method for measuring the hardness of the spout 20. As a measuring device, a Tensilon TRC-1225A manufactured by A&D Corporation is used.

[0117] First, a part of the tubular portion 21 of the spout 20 is cut out to prepare a test piece 85. As shown in FIG. 13, the test piece 85 may include a screw thread 22. Next, as shown in FIG. 13, the tubular portion 21 is placed on a stand 87. The extension direction of the tubular portion 21 is parallel to the surface direction of the stand 87. Next, the head 86 compresses the test piece in the radial direction of the tubular portion 21. The compression speed is 10 mm / min, and the compression amount is 2 mm.

[0118] The maximum value of the compressive force is measured for the 10 test pieces 85. The average value of the maximum values ​​is calculated as the hardness of the tubular portion 21. The measurement is performed in an environment where the temperature is 25° C. and the relative humidity is 50%. EXAMPLES

[0119] Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the description of the following examples as long as it does not depart from the gist of the present invention.

[0120] The spouts 20 of Examples 1 to 16 were produced using HDPE, LDPE, the second LLDPE, the first LLDPE, or a mixed resin thereof. The compositions and densities of the spouts 20 of Examples 1 to 16 are shown in FIG. 14. The spouts 20 of Examples 1 to 10 all contain 30% by mass or more of HDPE and 20% by mass or more of the first LLDPE or 30% by mass or more of a low-density resin. In addition, the cap 30 was produced using HDPE.

[0121] The HDPE used was HJ490 manufactured by Japan Polyethylene. The density and melt flow rate of HJ490 are 0.958 g / cm 3 and 20g / 10min. The LDPE used was LJ802 manufactured by Japan Polyethylene. The density and melt flow rate of LJ802 are 0.918 g / cm 3 and 22g / 10min. The second LLDPE used was UJ370 manufactured by Japan Polyethylene. The density and melt flow rate of UJ370 are 0.921 g / cm 3 and 16g / 10min. The first LLDPE was KJ640T manufactured by Japan Polyethylene. The density and melt flow rate of KJ640T are 0.880 g / cm 3 and 30g / 10min.

[0122] The outer diameter W1 of the cylindrical portion 21 of the spout 20 was 11 mm. The thickness T1 of the cylindrical portion 21 was 2 mm. The distance W2 between the outer ends of the pair of mounting portions 23 in the radial direction was 22 mm.

[0123] Also, a laminate 40 was produced, which was provided with a substrate 50, a printed layer, an adhesive layer 60, and a sealant layer 70 in this order.

[0124] Specifically, a polyethylene film was produced by melt extrusion molding. Then, the polyethylene film was subjected to a stretching process. As a result, a stretched polyethylene film constituting the substrate 50 was obtained. MDPE was used as the material for the substrate 50. The density and melt flow rate of MDPE were 0.941 g / cm 3 and 1.3 g / 10 min. The thickness of the substrate 50 was 25 μm. Next, a print layer was formed on the surface of the substrate 50 by gravure printing. In addition, an unstretched polyethylene film constituting the sealant layer 70 was produced by melt extrusion molding. LLDPE was used as the material for the sealant layer 70. The density and melt flow rate of LLDPE were 0.929 g / cm 3 and 1.1 g / 10 min. The thickness of the sealant layer 70 is 140 μm. Next, the substrate 50 on which the print layer was formed was laminated with the sealant layer 70 via the adhesive layer 60 by dry lamination. In this way, the laminate 40 was obtained.

[0125] Next, the inner surfaces of the laminate 40 were joined together by heat sealing. Also, the spout 20 was joined to the laminate 40 by heat sealing. Next, the laminate 40 was cut into the shape of the pouch 10. In this way, the pouch 10 and the pouch 10 including the spout 20 were obtained.

[0126] An apparatus manufactured by Shibuya Packaging was used as the apparatus for heat-sealing the spout 20 to the laminate 40. The heat-sealing conditions were as follows. Sealing temperature: 130℃ Sealing time: 0.9 seconds Air pressure: 0.6MPa Number of seals: 1 ·Cooling time: 0.9 seconds

[0127] The spouts 20 of Examples 1 to 16 and the containers 1 equipped with the spouts 20 were subjected to the following evaluations.

[0128] [Measurement of seal strength] The seal strength of the second seal portion 19b between the spout 20 and the pouch 10 was measured by the method shown in Figures 10 to 12. The results are shown in Figure 14. In Examples 1 to 10, 12, and 13, the seal strength was 10 N or more. In particular, in Examples 1, 2, 5, 8 to 10, 12, and 13, the seal strength was 20 N or more. On the other hand, in Examples 11 and 14 to 16, the seal strength was less than 10 N.

[0129] [Penetration evaluation] A check liquid was filled into the pouch 10 through the spout 20. Ageless Seal Check Liquid manufactured by Mitsubishi Gas Chemical Company was used as the check liquid. After filling with the check liquid and sealing the spout 20 with the cap 30, the container 1 was placed in an environment of a temperature of 23°C and a relative humidity of 50% RH for 24 hours. Thereafter, it was confirmed whether the check liquid had penetrated into the second seal portion 19b between the spout 20 and the pouch 10. The results are shown in FIG. 14.

[0130] In the "Penetration Evaluation" column of 14, "great" means that the penetration distance of the check liquid in the second seal portion 19b was 0.1 mm or less. "good" means that the penetration distance of the check liquid in the second seal portion 19b was 2.0 mm or less. "Not good" means that the penetration distance of the check liquid in the second seal portion 19b exceeded 2.0 mm. In Examples 1 to 10, 12, and 13, the penetration distance was 2.0 mm or less. In particular, in Examples 1, 2, 5, 8 to 10, 12, and 13, the penetration distance was 0.1 mm or less. On the other hand, in Examples 11 and 14 to 16, the penetration distance exceeded 2.0 mm.

[0131] [Measurement of hardness] The hardness of spout 20 was measured by the method shown in Fig. 13. The results are shown in Fig. 14. In Examples 1 to 11 and 14 to 16, the hardness was 30 N or more. In particular, in Examples 1 to 4, 6, 7, 11, and 14 to 16, the hardness was 50 N or more. On the other hand, in Examples 12 and 13, the hardness was less than 30 N.

[0132] [Overrun evaluation] With spout 20 held using a torque measuring device, cap 30 was rotated relative to spout 20 until overrun occurred. The torque at which overrun occurred was measured. The results are shown in Figure 14. The torque measuring device used was a TNJ-5 manufactured by Nidec-Shimpo Corporation.

[0133] The torque was 70 Ncm or more in Examples 1 to 11 and 14 to 16. In particular, the torque was 85 Ncm or more in Examples 1 to 4, 6, 7, 11 and 14 to 16. On the other hand, the torque was less than 70 Ncm in Examples 12 and 13. The smaller the torque, the more likely overrun occurs. [Explanation of symbols]

[0134] 1 container 10 pouches 11 Top 12 Lower 12a Lower seal part 13 Side 13a Side seal 14 Surface film 15 Back film 17 Storage unit 19 Seal part 20 Spout 21 Cylinder part 211 1st end 212 2nd end 22 threads 23 Mounting part 231 Mounting surface 24 First flange 25 Second flange 26 Protrusion 30 Cap 301 Top 302 Side 31 Protrusion 32 threads 33 Ring 34 Connection 35 Protrusion 40 Laminate 40x inner surface 40y external surface 50 Base material 51 Page 1 52 2nd page 60 Adhesive layer 70 Sealant Layer

Claims

1. A spout to be attached to a pouch containing a flowable content, A tube portion having a hollow cylindrical shape; An attachment portion that extends outward in a radial direction of the cylindrical portion from an outer peripheral surface of the cylindrical portion and is joined to the pouch, The mounting portion includes a first mounting surface joined to an inner surface of a front film of the pouch, and a second mounting surface joined to an inner surface of a back film of the pouch, The spout is made of a polyethylene resin composition, The polyethylene resin composition comprises a mixture of HDPE and one or more low density resins selected from the group consisting of LLDPE and LDPE, The content of the HDPE in the polyethylene resin composition is 30% by mass or more, The density of the polyethylene resin composition is 0.900 g / cm ３ 0.947g / cm or more ３ is as follows: A spout, in which when the spout is held using a torque measuring device TNJ-5 manufactured by Nidec-Shimpo Corporation and a cap is rotated relative to the spout until an overrun occurs, the torque at which an overrun occurs is 70 Ncm or more and 103.4 Ncm or less.

2. The polyethylene resin composition has a viscosity of 0.910 g / cm ３ a first LLDPE which is an LLDPE having a density less than The spout according to claim 1, wherein the content of the first LLDPE in the polyethylene resin composition is 20% by mass or more.

3. The spout according to claim 1 or 2, wherein the content of the low-density resin in the polyethylene resin composition is 30% by mass or more.

4. The cylindrical portion has a hardness of 30 N or more in a radial direction, The spout according to any one of claims 1 to 3, wherein the hardness is a compression force when the head of a Tensilon TRC-1225A manufactured by A&D Corporation compresses the test piece in the radial direction of the cylindrical portion at a compression speed of 10 mm / min and a compression amount of 2 mm in a state where the cylindrical portion is placed on a table such that the extension direction of the test piece in the cylindrical portion is parallel to the surface direction of the table of the Tensilon TRC-1225A manufactured by A&D Corporation in an environment of a temperature of 25°C and a relative humidity of 50%.

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