Packaging container

Abstract

The present invention provides a packaging container capable of improving drop strength even for a packaging bag of a mono-material. More specifically, the present invention is a packaging container 31 comprising: a packaging bag 20 having a top surface 20a on the opposite side of a bottom surface 20b; and a spout 10 sealed to the top surface 20a, The width W of the packaging bag 20 is 80-300 mm, the height H from the bottom surface 20b to the top surface 20a is 130-400 mm, and the outer diameter of the spout 10 is 20 mm or les. The top surface 20a has a top surface film seal part 21 obtained by sealing together films 23 and disposed on both sides, in a width direction of the packaging bag 20, of a spout seal part 22. An interval T between a lower edge 22a of the spout seal part 22 and a lower edge 21a of the top surface film seal part 21 is 4-7 mm. The top surface film seal part 21 has, toward the lower edge 22a of the spout seal part 22, an arc section 21b having a radius R larger than 8 mm and smaller than 25 mm.

Description

packaging container

[0001] The present invention relates to a packaging container.

[0002] As an example of a conventional packaging bag, paragraph 0010 of Patent Document 1 describes the 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 polypropylene (PP) as the bag body of a spout-equipped bag.

[0003] Japanese Patent Application Publication No. 2006-007630

[0004] In recent years, mono-material containers and packaging that use a single or homogeneous resin such as polyethylene have been proposed to facilitate recycling. However, mono-material packaging bags have the problem of being inferior in drop strength compared to conventional packaging bags.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a packaging container that can improve the drop strength even for mono-material packaging bags.

[0006] In order to solve the above problems, the present invention has the following configuration: [1] A packaging container comprising a packaging bag having a top surface on the opposite side to a bottom surface and a spout sealed to the top surface, wherein the width of the packaging bag is 80 mm or more and 300 mm or less, the height from the bottom surface of the packaging bag to the top surface is 130 mm or more and 400 mm or less, the outer diameter of the spout is 20 mm or less, the top surface has a top film seal part that seals the films of the packaging bag together and a spout seal part that seals the spout between the films of the packaging bag, and the top film seal The top film seal portion is disposed on both sides of the spout seal portion in the width direction of the packaging bag, the lower end of the top film seal portion is located lower than the edge of the lower end of the spout seal portion, the distance between the edge of the lower end of the spout seal portion and the lower end of the top film seal portion is 4 mm to 7 mm, and the top film seal portion has an arc portion with a radius of 8 mm to 25 mm toward the edge of the lower end of the spout seal portion, the center of which is higher than the lower end of the top film seal portion. [2] In [1], the distance between the edge of the lower end of the spout seal portion and the corner of the lower end of the spout is 0 mm to 1 mm. [3] In [1] or [2], the film of the packaging bag is made of a laminated film having two or more layers of resin film, and the two or more layers of resin film are formed only from a polyethylene-based resin. [4] In any one of [1] to [3], at least the outer periphery of the spout sealed to the film is formed from a polyethylene-based resin.

[0007] According to the present invention, by providing a predetermined configuration on the top surface of the packaging bag where the spout is sealed, it is possible to improve the drop strength even for mono-material packaging bags.

[0008] 1 is a front view showing an example of a packaging container including a packaging bag and a spout;

[0009] The present invention will be described below based on preferred embodiments.

[0010] As shown in FIG. 1, the packaging container 31 includes a packaging bag 20 having a top surface 20a opposite to a bottom surface 20b, and a spout 10 sealed to the top surface 20a.

[0011] The spout 10 in the illustrated example has an attachment portion 12 that is welded to the packaging bag 20, and a spout portion 11 that protrudes outward from the packaging bag 20 from the attachment portion 12. The attachment portion 12 is arranged along the top surface 20a of the packaging bag 20. The spout portion 11 has a cylindrical flow path 11a therein that can pour out the contents of the packaging bag 20. The flow path 11a is formed from the lower end 12a of the spout 10 at the attachment portion 12 to the tip 11b of the spout portion 11.

[0012] In the illustrated example, the packaging bag 20 has a body member 24 made of a pair of films 23, with a bottom member 26 sandwiched between them. The bottom member 26 is folded in half and placed below the body member 24. Above the bottom member 26, body seals 25 are formed on the left and right sides, joining the front and rear body members 24 together. The bottom member 26 is joined to the body member 24 by a bottom seal 27. When the bottom member 26 is unfolded, the packaging bag 20 can stand on its own.

[0013] In the illustrated packaging container 31, the spout 10 is adhered facing upward to the center of the top seal portion 28, sealing the inside of the packaging bag 20. The top seal portion 28 has a top film seal portion 21 that seals the films 23 of the packaging bag 20 together, and a spout seal portion 22 that seals the spout 10 between the films 23. The top film seal portions 21 are arranged on both sides of the spout seal portion 22 in the width direction of the packaging bag 20.

[0014] In the packaging container 31 of the embodiment, the width W of the packaging bag 20 is 80 mm or more and 300 mm or less. In the illustrated example, the width W includes the distance from one body seal portion 25 to the other body seal portion 25. The specific width W is not particularly limited, but examples include a numerical range with upper and lower limits set at two points selected from the group consisting of 80 mm, 100 mm, 150 mm, 180 mm, 200 mm, 250 mm, and 300 mm.

[0015] In the packaging container 31 of the embodiment, the height H of the packaging bag 20 is 130 mm or more and 400 mm or less. In the illustrated example, the height H includes the distance from the bottom surface 20b to the top surface 20a. The specific height H is not particularly limited, but may be, for example, a numerical range with upper and lower limits set at two points selected from the group consisting of 130 mm, 150 mm, 180 mm, 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm.

[0016] In the packaging container 31 of this embodiment, the outer diameter S of the spout 10 is 20 mm or less. In the illustrated example, the outer diameter S is the outer diameter at the lower end 12a of the spout 10, and in the case of the illustrated mounting portion 12, it is the minor axis of the mounting portion 12 as shown in Fig. 2. The specific outer diameter S is not particularly limited, but may be, for example, a numerical range with upper and lower limits selected from the group consisting of 5 mm, 10 mm, 15 mm, and 20 mm.

[0017] The lower end 21a of the top film seal portion 21 is located lower than the edge of the lower end 22a of the spout seal portion 22. The top film seal portion 21 has an arc portion 21b toward the edge of the lower end 22a of the spout seal portion 22. The center of the arc portion 21b is higher than the lower end 21a of the top film seal portion 21. The arc portion 21b connects the lower end 21a of the top film seal portion 21 to the edge of the lower end 22a of the spout seal portion 22. It is preferable that the lower end of the arc portion 21b smoothly connects with the lower end 21a of the top film seal portion 21.

[0018] In the packaging container 31 of this embodiment, the distance T between the edge of the lower end 22a of the spout seal portion 22 and the lower end 21a of the top film seal portion 21 is 4 mm or more and 7 mm or less. The distance T represents the width of the step between the lower end 22a of the spout seal portion 22 and the lower end 21a of the top film seal portion 21. Specific examples of the distance T include a numerical range with upper and lower limits set to two points selected from the group consisting of 4 mm, 5 mm, 6 mm, and 7 mm.

[0019] In the packaging container 31 of this embodiment, the radius R of the arc portion 21b is greater than 8 mm and less than 25 mm. Specific examples of the radius R include a range of values ​​with two upper and lower limits selected from the group consisting of 9 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, and 24 mm. Note that if there is no arc portion 21b between the lower end 21a of the top film seal portion 21 and the lower end 22a of the spout seal portion 22, and the arc portion 21b is linear, the radius R is considered to be infinite.

[0020] If the distance T is small or the radius R is large, the bag may tear from the spout seal portion 22 or its periphery. If the radius R is small, the bag may tear from the arc portion 21b or its periphery.

[0021] The spout seal portion 22 is sealed to the film 23 near the lower end 12a of the spout 10, leaving almost no unsealed gap. That is, the gap G between the edge of the lower end 22a of the spout seal portion 22 and the corner of the lower end 12a of the spout 10 is preferably 0 mm or more and 1 mm or less. The gap G is the unsealed width near the corner of the spout. A gap G of 0 mm means that there is no unsealed portion near the lower end 12a of the spout 10.

[0022] Even if film 23 exists below lower end 12a of spout 10, the lower film 23 is not sealed to spout 10, so gap G does not take a negative value. Furthermore, although not specifically shown, if an unsealed portion exists near lower end 12a of spout 10, gap G will be greater than 0 mm depending on the width of that unsealed portion. If gap G is large, the impact from the weight of the contents when dropped will act on the unsealed portion, and there is a risk that the bag will tear from spout seal portion 22 or its surroundings.

[0023] In the illustrated example, the upper end of the top film seal portion 21 and the upper end of the spout seal portion 22 are both located on the top surface 20a and are at the same height. Therefore, in the illustrated example, the width of the top film seal portion 21 is wider than the width of the spout seal portion 22. Although not specifically shown, the width of the top film seal portion 21 may be approximately the same as the width of the spout seal portion 22. The heights of the upper ends of the top film seal portion 21 and the spout seal portion 22 may be different from each other.

[0024] Next, the packaging container 31 will be described in detail.

[0025] The shape of the spouting portion 11 is not particularly limited, but examples thereof include a cylindrical shape, an elliptical cylindrical shape, and a square cylindrical shape. Although not particularly shown, a lid member such as a cap may be attached to the spouting portion 11. A flange portion, a male thread portion, or the like may be formed on the outer peripheral surface of the spouting portion 11. When a male thread portion is provided on the spouting portion 11, a female thread portion is provided on the lid member. The method of attaching the lid member to the spouting portion 11 is not limited to screw connection, and may be fitting, engagement, or the like.

[0026] The shape of the attachment portion 12 is not particularly limited, and examples of the cross-sectional shape on the plane along the top surface 20a include a circular shape, an elliptical shape, and a boat shape. Here, the boat shape is, for example, a shape in which the major axis 2 along the top surface 20a protrudes in a substantially triangular shape and the minor axis 2 is curved in a substantially arc shape. In the illustrated example, the major axis 2 is the left-right direction in FIGS. 1 and 2, and the minor axis 2 is the direction perpendicular to the paper surface of FIG. 1 and the up-down direction in FIG. 2. The outer diameter S is the outer diameter of the portion where the spout 10 is sealed to the spout seal portion 22, and more specifically, it is the diameter in the front-to-rear direction at the portion where the attachment portion 12 is sealed to the front and rear body members 24.

[0027] The cross-sectional shape of the flow path 11a inside the spout 10 is not particularly limited, and examples of the cross-sectional shape on a plane along the top surface 20a include a circle, an ellipse, a polygon, etc. The inner surface of the flow path 11a may be concentric with the outer surface of the spout 11. The inside of the flow path 11a may be a single space, or may be partitioned into multiple spaces via partition walls or the like.

[0028] The method for welding the spout 10 to the film 23 is not particularly limited, but a heating member may be placed on the outside of the packaging bag 20 to heat the packaging bag 20 so that part of the resin melts between the packaging bag 20 and the spout 10. Specific examples of welding methods include heat sealing, ultrasonic sealing, high-frequency sealing, and impulse sealing.

[0029] The packaging container 31 can be manufactured by inserting the spout 10 into the packaging bag 20 while at least a portion of the top surface 20a of the packaging bag 20 has an unsealed opening, and forming at least the spout seal portion 22. At least a portion of the top film seal portion 21 may be sealed before joining the spout 10 to the packaging bag 20. At least a portion of the top film seal portion 21 may be formed simultaneously with the spout seal portion 22.

[0030] The spout 10 is preferably formed from a polyethylene-based resin. Examples of polyethylene-based resins include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), etc. The method for forming the spout 10 is not particularly limited, but examples include injection molding, extrusion molding, etc.

[0031] Spout 10 may be formed from one type of resin, or may be formed from a blend or laminate of two or more types of resin. At least a portion of the resin used in spout 10 may be recycled from used resin. At least the outer periphery of spout 10 where it is sealed to film 23 is preferably formed from a polyethylene resin.

[0032] Although it is possible to use a two-color molded spout 10, it is preferable to use a single resin to form the spout 10. In the case of a two-color molded spout 10, the inner surfaces of the flow paths 11a arranged in the spout portion 11 and the attachment portion 12 may be formed from an appropriate material different from that of the outer periphery of the attachment portion 12, such as a cyclic olefin resin.

[0033] The film 23 forming the packaging bag 20 may be made of one type of resin, or may be made of a blend or laminate of two or more types of resin. At least one of the resins used in the film 23 is preferably a polyethylene-based resin. At least a portion of the resin used in the packaging bag 20 may be recycled from used resin.

[0034] The film 23 of the packaging bag 20 may include multiple resin films, such as a sealant, a substrate, etc. To form a mono-material packaging bag 20, the resin film is preferably made of only a polyethylene-based resin, and when the laminated film has two or more layers of resin films, each resin film is preferably made of only a polyethylene-based resin.

[0035] Examples of sealants for the film 23 include polyethylene resins. Specific examples include LLDPE and LDPE. The sealant may be a single resin or a blend of two or more resins. The thickness of the sealant is not particularly limited, but may be, for example, about 60 to 180 μm.

[0036] Examples of the substrate of the film 23 include resin, paper, cellophane, and metal foil. The resin film substrate is not particularly limited, but examples include polyolefin resins such as polyethylene resins. Specific examples of resins used for the substrate include LLDPE, LDPE, MDPE, HDPE, and PP. The resin film substrate may be uniaxially or biaxially stretched. The thickness of the substrate is not particularly limited, but examples include a thickness of each layer or total thickness of approximately 10 to 50 μm.

[0037] When the film 23 is a laminated film, the layers may be laminated via an adhesive layer by dry lamination, sandwich lamination, etc. Multiple resin films may be laminated by coextrusion, thermal lamination, extrusion lamination, etc., without using an adhesive layer.

[0038] When the adhesive layer is formed by the dry lamination method, urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, organic titanium compounds such as titanium alkoxides, etc. may be used. When the adhesive layer is formed by extrusion resin, adhesive resins such as polyolefin resins such as polyethylene resins, modified resins, etc. may be used.

[0039] Although not specifically shown, a printed layer, a vapor-deposited layer, or the like may be formed on at least one side of each resin film included in film 23. 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 or ultraviolet-curable ink. The vapor-deposited layer may be formed from a metal such as aluminum, or an inorganic compound such as silica or alumina. Metal foil may be laminated on the resin film. In mono-material packaging, no metal foil is used, and only a thin vapor-deposited layer may be used, or no vapor-deposited layer may be used at all.

[0040] The polyethylene resin used for the spout 10, the packaging bag 20, etc. may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. The proportion of ethylene in the constituent monomers is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. In a homopolymer, the proportion of the specific olefin in the constituent monomers is substantially about 100% by weight. In a copolymer, a monomer other than ethylene is copolymerized in an appropriate proportion.

[0041] Examples of the monomer other than ethylene include one or more of α-olefins such as propylene, 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. Ethylene and other monomers may be derived from fossil resources such as petroleum, or from biomass such as plants. At least a portion of the monomers may be derived from recycled used resins.

[0042] The resin used for the spout 10 and / or the packaging bag 20 may contain other resins and / or additives within an appropriate range. The additives for the resin are not particularly limited, but examples thereof include antioxidants, lubricants, antiblocking agents, flame retardants, ultraviolet absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, etc.

[0043] It is preferable that the total weight of the spout 10 and / or packaging bag 20 is 80% by weight or more and the total weight of materials other than polyethylene-based resins is 20% by weight or less, and it is even more preferable that the total weight of the polyethylene-based resins is 90% by weight or more and the total weight of materials other than polyethylene-based resins is 10% by weight or less.

[0044] Specific examples of the packaging bag 20 include, but are not limited to, various pouches such as three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusseted bags, standing pouches, etc. The dimensions of the packaging bag 20 are not particularly limited, but for example, when used as a refill container, the height in the vertical direction is about 100 to 500 mm, the width in the horizontal direction is about 70 to 300 mm, and the filling amount is about 100 cm ３ ~5000cm ３ The degree of

[0045] The state of the contents of the packaging bag 20 is not particularly limited, but examples thereof include fluids such as liquids, powders, and granules, and solids such as articles. The type of contents of the packaging bag 20 is not particularly limited, but examples thereof include detergents, medicines, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, and fuels.

[0046] The present invention will be specifically described below with reference to examples, but is not limited to these examples.

[0047] As shown in Figure 1, in a packaging container 31 in which a spout 10 is sealed to the top surface 20a of a packaging bag 20, top film seal portions 21 are arranged on both sides of a spout seal portion 22, and these top film seal portions 21 are provided with arc portions 21b that point toward the edge of the lower end 22a of the spout seal portion 22. A laminated film of a polyethylene (PE) resin was used as the film 23. A molded product of a polyethylene (PE) resin was used as the spout 10.

[0048] (Test 1) Table 1 shows the width W and height H of the packaging bag 20, the outer diameter S of the spout 10, the distance T between the edge of the lower end 22a of the spout seal portion 22 and the lower end 21a of the top film seal portion 21, the radius R of the arc portion 21b, and the results of the drop test. When no arc portion 21b was provided, R was taken as a straight line. In Table 1, the units of W, H, S, T, and R are "mm."

[0049]

[0050] The drop test was conducted five times in the vertical direction (vertical drop so that the top seal 28 struck the surface) and five times in the horizontal direction (horizontal drop so that the flat, unsealed surface of the film 23 struck the surface). The drop height, temperature, and content amount were set as follows depending on the size: (1) For a W85mm, H160mm container, the drop height was 1m, the temperature was 5°C, and the content was 160g. (2) For a W180mm, H245mm container, the drop height was 1m, the temperature was 5°C, and the content was 900g. (3) For a W220mm, H340mm container, the drop height was 0.8m, the temperature was 5°C, and the content was 2000g.

[0051] The results of the drop test were expressed as "number of broken bags / number of samples." Bag breakage at the edge of the lower end 22a of the spout seal portion 22 was designated "edge breakage," and bag breakage at the edge of the arc portion 21b was designated "R-breakage." The evaluation was as follows: zero broken bags were considered pass (◯), and one or more broken bags were considered fail (×).

[0052] (Test 2) Table 2 shows the results of the drop test for the width W and height H of the packaging bag 20, the outer diameter S of the spout 10, the distance T between the edge of the lower end 22a of the spout seal portion 22 and the lower end 21a of the top film seal portion 21, the radius R of the arc portion 21b, and the distance G between the edge of the lower end 22a of the spout seal portion 22 and the corner of the lower end 12a of the spout 10. The drop test was conducted in the same manner as in Test 1. In Table 2, the units for W, H, S, T, R, and G are "mm."

[0053]

[0054] The results of the drop test were expressed as "number of broken bags / number of samples." Bag breakage at the bottom end 22a of the spout seal portion 22 was designated "edge breakage," bag breakage at the edge of the arc portion 21b was designated "R-breakage," and bag breakage at the corner of the bottom end 12a of the spout 10 was designated "corner breakage." The evaluation was for zero broken bags as pass (◯), and for one or more broken bags as fail (×). The overall evaluation was a combination of the evaluations for edge and R-breakage and the evaluation for corner breakage.

[0055] According to the packaging container of the embodiment, the drop strength could be improved even for mono-material packaging bags.

[0056] G...distance between the edge of the lower end of the spout seal portion and the corner of the lower end of the spout, H...height of the packaging bag, R...radius of the arc portion, S...outer diameter of the spout, T...distance between the edge of the lower end of the spout seal portion and the lower end of the top film seal portion, W...width of the packaging bag, 10...spout, 11...pouring portion, 11a...flow path, 11b...tip of the pouring portion, 12...mounting portion, 12a...lower end of the spout, 20...packaging bag, 20a...top surface, 20b...bottom surface, 21...top film seal portion, 21a...lower end of the top film seal portion, 21b...arc portion, 22...spout seal portion, 22a...lower end of the spout seal portion, 23...film, 24...body member, 25...body seal portion, 26...bottom member, 27...bottom seal portion, 28...top seal portion, 31...packaging container

Claims

A packaging container comprising a packaging bag having a top surface on the opposite side of a bottom surface and a spout sealed to the top surface, The width of the packaging bag is 80 mm or more and 300 mm or less, The height from the bottom surface to the top surface of the packaging bag is 130 mm or more and 400 mm or less, The outer diameter of the spout is 20 mm or less, The top surface has a top surface film seal portion that seals the films of the packaging bag together, and a spout seal portion that seals the spout between the films of the packaging bag, and the top surface film seal portion is arranged on both sides of the spout seal portion in the width direction of the packaging bag, The lower end of the top film seal portion is located lower than the edge of the lower end of the spout seal portion, and the distance between the edge of the lower end of the spout seal portion and the lower end of the top film seal portion is 4 mm or more and 7 mm or less, The top film seal portion has an arc portion with a radius greater than 8 mm and less than 25 mm, the arc portion being centered above the lower end of the top film seal portion toward the edge of the lower end of the spout seal portion.

2. The packaging container according to claim 1, wherein the distance between the edge of the lower end of the spout seal portion and the corner of the lower end of the spout is 0 mm or more and 1 mm or less.

3. The packaging container according to claim 1, wherein the film of the packaging bag is a laminated film having two or more layers of resin film, and the two or more layers of resin film are formed only from polyethylene-based resin.

4. The packaging container according to claim 1, wherein at least the outer periphery of the spout, which is sealed to the film, is made of a polyethylene resin.

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