Pouch container

Abstract

To provide a flexible pouch container with improved drop resistance.SOLUTION: A flexible pouch container 100 including a container body 10 and a coating body 30 covering the container body, comprising a body-constitution sheet material includes a sealant layer composed of a thermoplastic resin, the sealant layer is formed by laminating and bonding a plurality of layers including an EVOH layer having an ethylene unit content of 20 to 50 mol% and a saponification degree of 90 mol% or more and a LLDPE layer having a density of 0.880 g / cm3 or more and 0.925 g / cm3 or less, further has a piercing strength of 6 N or more, a piercing elongation of 8 mm or more, and a thickness of 200 μm or less, a coating sheet material is composed of a paper layer and has the piercing strength of 6 N or more, the coating body covers the entire axial circumference of a trunk body part 16, and is in contact with the body-constitution sheet material on the outer circumferential surface of the trunk part without being joined, or is partially joined to the body-constitution sheet material on the outer circumferential surface of the trunk part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pouch container. [Background technology]

[0002] Flexible pouch containers made of thermoplastic resins are widely used as containers for packaging and storing detergents, cosmetics, disinfectants, medicines, food, etc. Since these flexible pouch containers can reduce resource usage and waste compared to plastic molded containers, demand for them is increasing against the backdrop of economical efficiency, environmental issues, etc.

[0003] For example, Patent Document 1 discloses a polyethylene film formed from an ethylene polymer that satisfies certain conditions and is characterized in that short chain branches having 1 to 20 carbon atoms and long chain branches having more than 20 carbon atoms are introduced into the polymer main chain, as well as an easily tearable standing pouch formed from this polyethylene film. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-177168 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, such flexible pouch containers made of thermoplastic resins often do not have sufficient resistance to dropping compared to plastic molded containers. Although the standing pouch described in the above-mentioned Patent Document 1 is described as having excellent impact strength, there is room for further improvement in such flexible pouch containers in terms of resistance to tearing when the container is dropped (drop resistance).

[0006] The present invention has been made in consideration of the above problems, and relates to a flexible pouch container with improved drop resistance, and a containerized product. [Means for solving the problem]

[0007] The present invention provides a flexible pouch container comprising a container body having a front surface, a rear surface, and a bottom surface, the container body being formed by bagging a body-constituting sheet material so as to have an internal storage area, and a covering body formed by a covering sheet material and covering the container body, the body-constituting sheet material including a sealant layer made of a thermoplastic resin, the body-constituting sheet materials being bonded together by the sealant layers with the inner surfaces of the body-constituting sheet materials facing each other to form a bag, the sealant layer including an EVOH layer made of an ethylene-vinyl alcohol copolymer having an ethylene unit content of 20 to 50 mol% and a saponification degree of 90 mol% or more, and a density of 0.880 g / cm 3 More than 0.925g / cm 3 the covering sheet material is composed of a paper layer and has a puncture strength of 6N or more, a puncture elongation of 8mm or more, and a thickness of 200μm or less; the covering body covers at least the entire periphery around the axis of the body portion constituting the front and rear surfaces of the container body, and is in contact with the body-constituting sheet material on the outer periphery of the body portion without being joined, or is partially joined to the body-constituting sheet material on the outer periphery of the body portion. Effect of the Invention

[0008] According to the present invention, it is possible to provide a flexible pouch container with improved drop resistance, and a containerized product using this pouch container. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a front view of a pouch container according to an embodiment of the present invention. [Diagram 2]FIG. 2 is a rear view of the pouch container according to the embodiment of the present invention, showing the state before contents are placed inside the pouch container. [Diagram 3] 1 is a plan view of a covering sheet material constituting a covering body of a pouch container according to an embodiment of the present invention. FIG. [Figure 4] FIG. 2 is a plan view of a body-constituting sheet material that constitutes the container body of the pouch container according to the embodiment of the present invention. [Diagram 5] 1 is a rear view of a container body of a pouch container according to an embodiment of the present invention, showing a state before contents are contained therein. [Figure 6] FIG. 2 is a partial cross-sectional view of a covering sheet material and a main body sheet material constituting a pouch container according to an embodiment of the present invention. [Figure 7] 10 is a partial cross-sectional view of a modified example of the covering sheet material and the main body sheet material constituting the pouch container according to the embodiment of the present invention. FIG. [Figure 8] FIG. 1 is a schematic diagram of a puncture test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In all drawings, similar components are given the same reference numerals, and duplicated descriptions are omitted as appropriate. In addition, in some drawings, there are some parts that are not given reference numerals (omitted) for convenience. Furthermore, the dimensional ratios of each component shown in the drawings may differ from the actual dimensional ratios in order to facilitate understanding of the invention.

[0011] [Overall structure] First, the overall configuration of an embodiment of a pouch container and a containerized product according to the present invention will be described with reference to Figs. 1 to 5. The pouch container according to the present invention includes the following embodiments.

[0012] The pouch container 100 according to this embodiment is a flexible pouch container comprising a container body 10 having a front surface, a rear surface, and a bottom surface, formed by bagging the main body sheet material 20 so as to have a storage area 60 inside, and a covering body 30 formed by a covering sheet material 40 and covering the container body 10. The main body sheet material 20 includes a sealant layer 200 made of a thermoplastic resin, and the inner surfaces of the main body sheet materials 20 are opposed to each other to be bonded together to form a bag. The sealant layer 200 is an EVOH layer made of an ethylene-vinyl alcohol copolymer having an ethylene unit content of 20 to 50 mol% and a saponification degree of 90 mol% or more, and a density of 0.880 g / cm 3 More than 0.925g / cm 3 A plurality of layers including an LLDPE layer made of a linear short-chain branched low-density polyethylene having a molecular weight of 100 or less are laminated and bonded together, and the sealant layer 200 has a puncture strength of 6 N or more, a puncture elongation of 8 mm or more, and a thickness of 200 μm or less. The covering sheet material 40 is made of a paper layer 401 and has a puncture strength of 6 N or more. The covering body 30 covers at least the entire periphery around the axis of the body 16 that constitutes the front and rear surfaces of the container body 10, and is in contact with the body-constituting sheet material 20 on the outer periphery of the body 16 without being bonded, or is partially bonded to the body-constituting sheet material 20 on the outer periphery of the body 16.

[0013] In the following, an embodiment of the pouch container 100 in which the covering body 30 is in contact with the sheet material 20 constituting the main body on the outer peripheral surface of the body 16 without being joined is referred to as the "first embodiment", and an embodiment of the pouch container 100 in which the covering body 30 is partially joined to the sheet material 20 constituting the main body on the outer peripheral surface of the body 16 is referred to as the "second embodiment". These embodiments will be described in detail below, but the explanation of the positional relationship (upper / lower relationship, left / right relationship, etc.) of each component of the pouch container 100 is the explanation of the positional relationship in a state where the pouch container 100 is placed on a placement surface with the bottom surface facing down, unless otherwise specified. Therefore, the positional relationship in these explanations does not necessarily match the positional relationship during use or manufacturing of the pouch container 100.

[0014] <First Embodiment> The first embodiment of the pouch container 100 according to this embodiment is a flexible pouch container including a container body 10 and a cover body 30. The container body 10 is formed by folding (bending) the body-constituting sheet material 20 including the sealant layer 200 made of thermoplastic resin so as to form at least the front, rear, and bottom of the container body 10, and by joining the sealant layers 200 of the side edge portions on the opposing inner surfaces of the front surface constituent sheet portion 21 and the rear surface constituent sheet portion 23 of the body-constituting sheet material 20 to each other to form a side seal portion 11, and by providing a bottom gusset portion 13 on the lower side of the bottom surface of the body portion 16 (body portion 16 constituting the front and rear surfaces of the container body 10) formed by the front surface constituent sheet portion 21 and the rear surface constituent sheet portion 23, in which the area including the bottom surface constituent sheet portion 22 of the body-constituting sheet material 20 forms a foldable gusset structure and connects the front surface and the rear surface, and by further joining parts of the other peripheral portions (sealant layers 200) to each other to form a bag, thus forming a bag-like shape having a storage area 60 inside (see Figures 4 and 5). That is, the sealant layer 200 of the sheet material 20 constituting the main body is made into a bag so as to surround the storage area 60, thereby forming the container body 10. The sealant layers 200 of the sheet material 20 constituting the main body can be joined together (such as by forming a sealed portion) by heat sealing, ultrasonic sealing, or a bonding agent (such as an adhesive), but from the viewpoint of improving the recyclability of the container body 10 (ease of recycling and improvement in the quality of the obtained recycled resin), it is preferable that the above-mentioned joining is performed by heat sealing or ultrasonic sealing, and more preferably by heat sealing. When the bag is arranged by heat sealing, the heat sealing conditions can be appropriately set depending on the characteristics of the thermoplastic resin constituting the sealant layer 200, and examples of the conditions include a sealing temperature of 110°C to 230°C, a sealing pressure of 0.1 MPa to 1.0 MPa, and a sealing time of 0.1 seconds to 10 seconds. The bottom gusset portion 13 has a structure that can be folded to reduce the storage area 60 of the pouch container 100 before the contents are stored, and can expand to give thickness to the pouch container 100 when the contents are stored in the storage area 60.

[0015] Furthermore, the covering body 30 is formed by folding (bending) the covering sheet material 40 composed of the paper layer 401 so as to cover at least the entire circumference around the axis of the body 16 constituting the front and rear surfaces of the container body 10, and covering the container body 10 (see Figs. 1 to 3). For example, this covering body 30 is shown as a sleeve-shaped (bag-shaped or tubular) embodiment in which the covering sheet material 40 is wrapped around the axis of the body 16 of the container body 10 so as to cover the entire circumference, and the peripheral parts (glued part 41, joint part 43 such as a flap, etc.) are joined together. Alternatively, the covering body 30 may be formed in a sleeve-shaped form from the covering sheet material 40 in advance, and the sleeve-shaped covering body 30 may be placed over the container body 10 to cover it. In this embodiment, at least the body 16 and the side seal part 11 of the container body 10 are substantially entirely covered by the covering body 30. Although not limited thereto, the front covering portion 31 of the covering body 30 covering the front surface of the container body 10 is preferably formed in substantially the same shape as the front surface of the container body 10, and similarly, the rear covering portion 32 of the covering body 30 covering the rear surface of the container body 10 is preferably formed in substantially the same shape as the rear surface of the container body 10. In addition, the bottom surface of the container body 10 may be an embodiment in which it is not covered by the covering body 30, but since the effect of the present invention is more easily exhibited, it is more preferable that the bottom surface of the container body 10 is also provided with a bottom covering portion 34 (for example, formed in substantially the same shape as the bottom surface) that covers and closes this area as shown in Figs. 1 to 3. In this case, since drop resistance is more easily improved, it is more preferable that the covering body 30 is configured to be integrally molded as a whole (configuration formed from a single sheet material). For example, a covering body 30 formed from a covering sheet material 40 in which each covering portion has a shape as shown in Figure 3 is integrated, and the front covering portion 31, rear covering portion 32, and bottom covering portion 34 of the covering body 30 each have a continuously connected area, and when the container body 10 is covered, the ends of the front covering portion 31 and the rear covering portion 32, and the ends of the rear covering portion 32 and the bottom covering portion 34 are joined by joints 43 (such as glued portions 41) (see Figures 1 and 2).In the first embodiment, the covering body 30 abuts against the body-constituting sheet material 20 on the outer peripheral surface of the trunk portion 16 of the container body 10 without being joined. However, in this first embodiment, it is sufficient that at least a portion of the covering body 30 and the body-constituting sheet material 20 on the outer peripheral surface of the body 16 are in contact with each other, and they may include a region where they are not in contact (a region having a gap between the covering body 30 and the body 16). Also, as long as the covering body 30 and the container body 10 are not joined in this body 16, there may be a region where the covering body 30 and the container body 10 are joined in a region of the container body 10 other than the body 16. However, since this makes it easier to separate the container body 10 and the covering body 30 during recycling, it is more preferable that the container body 10 and the covering body 30 are not joined as a whole (partially in contact without being joined). Furthermore, in the side seal portion 11 as well, it is preferable that the covering body 30 surrounds the side seal portion 11 so as to be approximately U-shaped (approximately U-shaped when viewed in a plane) when the cross section is viewed in the left-right direction of the pouch container 100 (the width direction of the body portion 16), and that this covering body 30 is not joined to the side seal portion 11 and at least a portion of it abuts against it.

[0016] In the above, an example in which the covering body 30 (covering sheet material 40) is molded as a whole has been described, but in this embodiment, the covering body 30 (covering sheet material 40) may be composed of, for example, a plurality of members each molded separately. In this case, these plurality of members may be attached or joined to the container body 10 individually. Furthermore, from the viewpoint of improving the shape retention of the pouch container 100, it is preferable that the covering body 30 has a configuration in which the contact between the outer circumferential surface of the body 16 of the container body 10 and the front covering part 31 or the rear covering part 32 of the covering body 30 is frictional contact, and the container body 10 is restricted from being displaced relative to the covering body 30 in the axial direction of the body 16. Furthermore, it is also preferable that the covering body 30 has a bottom covering part 34 which is bent convexly at the center between the front side and the rear side toward the opposite side of the bottom (the top surface or the opening 15 side).

[0017] Moreover, the pouch container 100 of the first embodiment is preferably a standing pouch that can stand on its own in a state where contents are stored in at least the storage area 60 and the pouch container 100 is placed on a placement surface with the bottom surface facing down. This is because the pouch container 100 can be displayed in a self-supporting state at a storefront or the like. A specific embodiment of such a self-supporting standing pouch is a pouch container 100 having a skirt portion 18 as shown in Figs. 1 and 2. The skirt portion 18 is disposed on the lower side of the side seal portion 11, and is formed by joining the side edges of a front lower skirt sheet 18b composed of a part of the front surface constituent sheet portion 21 and a part of the bottom surface constituent sheet portion 22 of the main body constituent sheet material 20, and a rear lower skirt sheet 18c composed of a part of the rear surface constituent sheet portion 23 and a part of the bottom surface constituent sheet portion 22, to each other, to form a skirt seal portion 18a, and the front lower skirt sheet 18b and the rear lower skirt sheet 18c are formed as a single unit via the skirt seal portion 18a. Here, in the plan view of Fig. 4, the formation regions of the seal parts, including the side seal parts 11 and the skirt seal part 18a, are indicated by two-dot chain lines. Also, in Figs. 1, 2, and 5, the formation regions of the seal parts and the like (such as the formation regions of the seal parts as viewed from the outside of the covering body 30 in Figs. 1 and 2) are indicated by dotted lines.

[0018] In particular, in the pouch container 100 of the first embodiment, the sealant layers 200 of the side edges (side ends) of the inner faces of the body-constituting sheet material 20 (front surface constituent sheet portion 21) constituting the front surface and the body-constituting sheet material 20 (rear surface constituent sheet portion 23) constituting the rear surface are joined together to form two side seal portions 11, the upper side of the container body 10 has a top surface that is formed by the body-constituting sheet material 20 (top surface constituent sheet portion 24) and connects the front surface and the rear surface, and the lower part of the container body 10 has a top surface that is formed by the body-constituting sheet material 20 (top surface constituent sheet portion 24) and connects the front surface and the rear surface. It is preferable that the pouch container 100 has a bottom surface (e.g., a bottom surface formed in substantially the same shape as the top surface) on the side (opposite the top surface), the top surface is provided with an opening 15 (such as a spout) that can receive and discharge contents and can be sealed, and further, both the top surface and the bottom surface have a foldable gusset structure (a top gusset portion 14 in which the area including the top surface sheet portion 24 of the main body sheet material 20 is a gusset structure, and a bottom gusset portion 13 in which the area including the bottom surface sheet portion 22 is a gusset structure). And, it is also preferable that the top surface is also provided with a top surface covering portion 33 (e.g., formed in substantially the same shape as the top surface) which is a covering body 30 that closes this area like the bottom surface described above (see Figs. 1 to 3). Note that the top surface covering portion 33 that closes this top surface may have an insertion hole 46 in the area of ​​the opening 15 through which the opening 15 such as a spout is inserted. The periphery of the insertion hole 46 may be joined to the body-constituting sheet material 20 on the outer peripheral surface of the top surface. Furthermore, the lower side of the container body 10 may be provided with the skirt portion 18 as described above. In this embodiment, from the viewpoint of covering the container body 10 in a good condition (more reliably exerting effects such as drop resistance), it is preferable that the separation distance between the front covering portion 31 and the rear covering portion 32 of the covering body 30 covering the front and rear surfaces (body portion 16) of the container body 10 is smaller on both sides (side seal portions 11) than at the center in the width direction of the container body 10 in a state in which an item is contained in the containing area 60.In addition, in this case, if the front surface of the container body 10 and the front surface covering portion 31 of the covering body 30 are curved in an arc-shaped convex shape toward the front side, and the rear surface of the container body 10 and the rear surface covering portion 32 of the covering body 30 are curved in an arc-shaped convex shape toward the rear side, the frictional resistance between them can more reliably restrict the relative displacement of the container body 10 relative to the covering body 30 in the axial direction of the trunk portion 16.

[0019] In this embodiment, at least a part of the front constituent sheet part 21 and the rear constituent sheet part 23 on the front and rear sides of the pouch container 100 is sandwiched between the two side seal parts 11 to form the body part 16, and when contents are contained in the storage area 60 of the pouch container 100, this body part 16 is configured to expand in the thickness direction of the main body constituent sheet material 20. In other words, the body part 16, the bottom gusset part 13, and the top gusset part 14 allow the pouch container 100 to be reduced (folded) so as not to be bulky before containing contents, and at least when the contents are contained, the pouch container 100 can stand on its own with the bottom side facing down, and furthermore, the pouch container 100 can be crushed into a small size after the contents are used up, making it easier to transport, store, dispose, and the like.

[0020] However, the first embodiment of the pouch container 100 according to the present embodiment may be configured as described above without the skirt portion 18, that is, without the skirt portion 18. In addition, it may have another member that can stand on its own in a state where the contents are stored in at least the storage area 60 and the bottom surface is placed on the placement surface downward. It is more preferable that this member is made of paper or thermoplastic resin (particularly polyolefin resin, and furthermore polyethylene resin), and more preferably made of a part of the covering sheet material 40 or the main body constituent sheet material 20. In addition, it may be an embodiment that does not have a top surface (top gusset portion 14, etc.) in the configuration described above. In other words, it may be an embodiment in which the peripheries of the upper side (upper side of the container body 10) of the front surface constituent sheet part 21 and the rear surface constituent sheet part 23 are joined to each other. Even in this embodiment having no top surface, it is preferable that the pouch container 100 is provided with a bottom gusset portion 13, and that the pouch container 100 can be reduced in size by the body portion 16 of the pouch container 100 and the bottom gusset portion 13 before the contents are stored, and that the pouch container 100 can be crushed into a small size after the contents are used up. Furthermore, the front covering portion 31 and rear covering portion 32 of the covering body 30 can also adopt the above-mentioned configurations.

[0021] Furthermore, the first embodiment of the pouch container 100 according to this embodiment is not limited to a form that can stand on its own when placed on a placement surface with the bottom surface facing down, and may be, for example, a pouch container that is not self-supporting but is intended to be placed lying down. The same applies to the second embodiment described later.

[0022] The opening 15, which can contain and discharge the contents and can be sealed, may have a structure having a repeatedly openable and closable plug structure (such as a plug structure having a cylindrical portion and a flange portion) typified by a spout, as shown in Figures 1 to 5. This plug structure may have a screw thread that can be sealed with a removable cap 50 (including a cap with a pump, etc.). From the viewpoint of improving the recyclability of the pouch container 100, etc., it is preferable that the opening 15 is made of a polyolefin resin (particularly a polyethylene resin) that is the same type of material as the above-mentioned EVOH and LLDPE contained in the sealant layer 200 of the main body sheet material 20, or that it is easily separable from the main body sheet material 20, etc.

[0023] However, the pouch container 100 according to this embodiment is not particularly limited to a stopper structure as long as the opening 15 is configured to be able to contain and discharge the contents. For example, the opening 15 may be a non-bonded portion of the main body sheet material 20 (the sealant layers 200 on the inner side of the main body sheet material 20) in the storage area 60, the contents are contained through this non-bonded portion, and this non-bonded portion is bonded and sealed by heat sealing or the like, and when the contents are discharged, a part of the sealed opening 15 is cut off. Appropriate selection can be made depending on the shape of the pouch container 100. From the viewpoint of further improving drop resistance, in the case of an embodiment in which the opening 15 is a plug structure such as a spout that can be repeatedly opened and closed, it is preferable that substantially the entire container body 10 except for this opening 15 is covered by the covering body 30 (the covering body 30 is combined with the container body 10), and in the case of an embodiment in which the opening 15 is a non-jointed portion or a joined portion (a portion that is cut off when the contained item is used) of the body-constituting sheet material 20 in the storage area 60 as described above, it is preferable that substantially the entire container body 10 including this opening 15 is covered by the covering body 30.

[0024] <Second embodiment> The second embodiment of the pouch container 100 according to this embodiment is a flexible pouch container including the container body 10 and the covering body 30 similar to the first embodiment described above. The covering body 30 may be a covering sheet material 40 formed in a sleeve shape or the like, similar to the first embodiment. In this second embodiment, the covering body 30 is partially joined to the body-constituting sheet material 20 on the outer peripheral surface of the body 16 in the container body 10. That is, in this second embodiment, it is sufficient that a part of the covering body 30 and a part of the body-constituting sheet material 20 on the outer peripheral surface of the body 16 are joined to each other, and further, this embodiment includes an area on the outer peripheral surface of the body 16 where they are not joined. The covering body 30 may also be joined to an area of ​​the container body 10 other than the body 16. In addition, in areas where the covering body 30 and the body 16 of the container body 10 are not joined, the covering body 30 and the container body 10 may be in contact with each other, or there may be a gap between them, but from the standpoint of improving shape retention, etc., an embodiment in which at least a portion of them is in contact with each other is preferred. The pouch container 100 according to this embodiment, including the first embodiment and the second embodiment, includes an area where the predetermined covering body 30 and the body-constituting sheet material 20 on the outer peripheral surface of the body 16 of the container body 10 are not joined. This makes it difficult for the impact of the container being dropped to be transmitted to the container body 10 (particularly the body 16), and the configuration of the sealant layer 200 of the body-constituting sheet material 20 and this configuration make it difficult for the container body 10 to break when dropped. In other words, the drop resistance is improved. Furthermore, the pouch container 100 according to this embodiment includes an area where the covering body 30 and the body-constituting sheet material 20 on the outer peripheral surface of the body 16 of the container body 10 are not joined, making it difficult for the container body 10 to break when pierced from the outside of the container, that is, the piercing resistance is also easily improved.

[0025] The covering body 30 and the container body 10 may be joined by heat sealing, ultrasonic sealing, a bonding agent (adhesive, etc.), or the like. In addition, since the container body 10 and the covering body 30 can be easily separated during recycling, etc., it is preferable that the peel strength of the joint between the covering body 30 and the container body 10 (the strength required to peel them off) is smaller than the peel strength of the joint between the sealant layers 200 of the body-constituting sheet material 20 in the container body 10 (the strength required to peel them off). In this configuration, when the covering body 30 is separated from the container body 10, an embodiment in which a small part of the covering body 30 remains on the container body 10 (the amount of the covering body 30 remaining on the container body 10 is, for example, less than 10% by mass, or even less than 5% by mass of the total mass of the covering body 30) may be included, but it is more preferable that the covering body 30 can be separated so that it does not substantially remain on the container body 10 (the amount of the covering body 30 remaining on the container body 10 is less than 1% by mass).

[0026] Also in the second embodiment, it is preferable that the pouch is a standing pouch that can stand on its own when the contents are contained in at least the containing area 60 and placed on a placement surface with the bottom surface facing down, by members such as the skirt portion 18 described above. It is also preferable that the pouch is an embodiment of a standing pouch that includes the two side seal portions 11, the bottom gusset portion 13, the top gusset portion 14, the opening 15, etc., as described above. Furthermore, as long as the covering body 30 is partially joined to the trunk portion 16 of the container body 10, the same configuration as in the first embodiment described above can be adopted in the second embodiment.

[0027] By using the pouch container 100 according to the present embodiment including the first and second embodiments, a containerized product in which contents are stored in the storage area 60 can be obtained. In the first embodiment described above, even when the contents are stored, at least a portion of the covering body 30 abuts against the main body-constituting sheet material 20 on the outer circumferential surface of the body 16. When using the contents stored in this containerized product, the contents are discharged from the opening 15 or the like by a squeezing operation or the like and used. The type of contents stored in the pouch container 100 is not particularly limited, and examples thereof include shampoo, rinse, conditioner, body soap, facial cleanser, detergent, bleach, fabric softener, beverage, food, engine oil, and the like. Furthermore, the contents may be liquid (including paste-like) or solid (for example, granular (including granular) or powder-like). If the pouch container 100 of this embodiment is a liquid-storage pouch container for storing liquid contents, this is highly preferable since it is less likely to cause leakage of the contents (liquid) due to breakage of the bag caused by dropping it. If the contained content is a liquid, its viscosity at 30°C is preferably 1 mPa·s or more, and preferably 120,000 mPa·s or less, and more preferably 60,000 mPa·s or less (both measured with a B-type viscometer (e.g., Toki Sangyo Co., Ltd. Viscometer TV-10 or Viscometer TVB-10)).

[0028] [Layer structure of main body sheet material and covering sheet material] Next, the layer structure of the body-constituting sheet material 20 and the covering sheet material 40 forming the pouch container 100 (container body 10 and covering body 30) according to this embodiment will be described in detail with reference to Fig. 6 to Fig. 8. For convenience, the covering sheet material 40 (covering body 30) and the body-constituting sheet material 20 (container body 10) are shown separated in Fig. 6 and Fig. 7.

[0029] First, the main body constituting sheet material 20 forming the container body 10 of the pouch container 100 according to this embodiment is a resin sheet material including a sealant layer 200 made of a thermoplastic resin. The inner surfaces of the main body constituting sheet materials 20 are opposed to each other and bonded to each other by the sealant layers 200 to form a bag, thereby forming the container body 10. Therefore, the main body constituting sheet material 20 is composed of the sealant layer 200, or the sealant layer 200 is disposed on the innermost side (the container inner side) of the main body constituting sheet material 20. Note that this sealant layer 200 may be an embodiment including a printed layer (such as a layer formed by offset printing, screen printing, gravure printing, flexographic printing, etc.) on its surface (for example, the surface on the outer surface side) or between layers, a protective layer (such as a medium printed layer, a coating layer coated with varnish or cellulose nanofiber (CNF), etc., a UV absorbing layer, etc.), an inorganic layer (such as aluminum foil), etc. However, from the viewpoint of improving the recyclability of the container body 10, it is more preferable that the sealant layer 200 does not include a printed layer, a protective layer, and an inorganic layer. Even in this embodiment, the sealant layer 200 may include a vapor-deposited film layer in which an inorganic oxide (silica, alumina, etc.) or a metal (aluminum, etc.) is vapor-deposited on the surface of the resin film layer.

[0030] In order to form the container body 10 and combine it with the covering body 30 to obtain a pouch container 100 having improved drop resistance while the main body-constituting sheet material 20 is relatively thin, the sealant layer 200 of the main body-constituting sheet material 20 is made of an EVOH layer made of an ethylene-vinyl alcohol copolymer having an ethylene unit content of 20 to 50 mol% and a saponification degree of 90 mol% or more, and a density of 0.880 g / cm 3 More than 0.925g / cm 3The sealant layer 200 includes an LLDPE layer made of the linear short-chain branched low-density polyethylene described below, and has the specified puncture strength, puncture elongation, and thickness described below. In other words, the sealant layer 200 is a multilayer structure (laminate structure) in which a plurality of layers including the above-mentioned EVOH layer and LLDPE layer are laminated and joined. Therefore, as long as it includes the EVOH layer and the LLDPE layer and has the specified puncture strength, puncture elongation, and thickness described below, it can be a layer made of another thermoplastic resin, for example a layer having a density of 0.940 g / cm. 3 High density polyethylene (e.g., medium-low pressure high density polyethylene, the density of which is, for example, 0.940 g / cm 3 More than 0.970g / cm 3 HDPE layer made of 0.940g / cm 3The laminate may further include an LDPE layer made of low-density polyethylene (e.g., high-pressure low-density polyethylene) having a density of less than 100 nm. Also, the laminate may further include an adhesive layer made of a resin material capable of bonding at least layers selected from the above. Examples of adhesive resin materials include modified olefin polymers containing carboxyl groups obtained by chemically bonding unsaturated carboxylic acid or its anhydride to an olefin polymer by addition reaction, graft reaction, or the like, and among these, maleic anhydride grafted modified polyethylene is preferred. Furthermore, the laminate may include two or more layers of the above-mentioned EVOH layer or LLDPE layer (e.g., two or more layers sandwiching a layer made of another thermoplastic resin). In addition, for example, a layer composed of a polyester-based resin such as polyethylene terephthalate (PET), amorphous polyethylene terephthalate (amorphous PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), or a polyamide-based resin such as stretched nylon (ONy), unstretched nylon (CNy), nylon 6, nylon 66, nylon 11, nylon 12, or MXD6 may be further included, but from the viewpoint of improving the recyclability of the container body 10, it is more preferable that the sealant layer 200 is composed of a polyolefin-based resin, and even more preferable that it is composed of a polyethylene-based resin. In other words, it is more preferable that the embodiment does not include a layer composed of a thermoplastic resin other than a polyolefin-based resin, and even more preferable that the embodiment does not include a layer composed of a thermoplastic resin other than a polyethylene-based resin. Furthermore, the sealant layer 200 may be an embodiment that does not substantially include materials other than polyolefin-based resins, or an embodiment that does not substantially include materials other than polyethylene-based resins. Here, "substantially free" means that the mass percentage is less than 1%, preferably less than 0.5%, and most preferably less than 0.1%, and the same applies to other matters.

[0031] Representative examples of polyolefin resins include polyethylene resins and polypropylene resins. Polyethylene resins include not only the above-mentioned ethylene-vinyl alcohol copolymer (EVOH), linear short-chain branched low-density polyethylene (LLDPE), high-density polyethylene (HDPE), and low-density polyethylene (LDPE), but also polypropylene resins with a density of 0.925 g / cm3 or less. 3 Super 0.940g / cm 3 Examples of such a resin include linear short-chain branched low-density polyethylene having a molecular weight of less than 1000, uniaxially oriented polyethylene (OPE) and biaxially oriented polyethylene (BOPE) obtained by stretching any of these, biopolyethylene (BioPE) obtained by dehydrating and polymerizing bioethanol produced from sugarcane molasses, and modified polyethylene (modified PE, for example, the maleic anhydride graft-modified polyethylene described above) modified (denatured) by graft polymerization using maleic acid or the like. Note that an embodiment made of a polyolefin-based resin may be, for example, an embodiment in which the outermost layer 201 of the sealant layer 200 is a layer made of a polypropylene-based resin and the other layers are made of a polyethylene-based resin.

[0032] The linear short-chain branched low-density polyethylene of a given density constituting the LLDPE layer is produced by copolymerizing ethylene with an α-olefin. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, and 4-methyl-1-pentene. An α-olefin having 4 or more carbon atoms is preferred, an α-olefin having 6 or more carbon atoms is more preferred, and an α-olefin having 8 or more carbon atoms is even more preferred. When the α-olefin copolymerized with ethylene has a relatively large carbon number, various mechanical strengths such as puncture strength and tensile strength may be particularly improved.

[0033] The density of the linear short-chain branched low-density polyethylene constituting the LLDPE layer is 0.880 g / cm3 as described above. 3 More than 0.925g / cm 3When the density is within the above range, the resulting sealant layer 200 is flexible and has excellent handleability, and various mechanical strengths such as puncture strength and tensile strength are improved. The lower limit of this density is 0.885 g / cm 3 is preferred, and 0.890 g / cm 3 More preferably, 0.895 g / cm 3 More preferably, the upper limit is 0.920 g / cm 3 is preferred, and 0.915 g / cm 3 More preferably, 0.910 g / cm 3 is more preferred.

[0034] The LLDPE layer is preferably an mLLDPE layer made of a metallocene-catalyzed linear short-chain branched low-density polyethylene. Here, the term "metallocene-catalyzed linear short-chain branched low-density polyethylene" refers to a linear short-chain branched low-density polyethylene produced by copolymerizing ethylene and an α-olefin using a metallocene as a catalyst. The linear short-chain branched low-density polyethylene polymerized using a metallocene catalyst is produced by copolymerizing ethylene and an α-olefin in the presence of a catalyst formed from a compound of a transition metal of Group 4 of the periodic table, preferably zirconium, having at least one or more ligands having a cyclopentadienyl skeleton, an organoaluminum oxy compound, and various components added as necessary. This metallocene-catalyzed linear short-chain branched low-density polyethylene has excellent melt moldability, and the resulting sealant layer 200 has an excellent balance between flexibility and mechanical strength.

[0035] This LLDPE layer may contain an antiblocking agent or a slip agent from the viewpoint of improving productivity (particularly, improving the openability of the non-jointed portion when the main body-constituting sheet material 20 is made into a bag). In particular, when the density of the linear short-chain branched low-density polyethylene constituting the LLDPE layer is 0.910 g / cm 3When the average particle diameter is less than 100 μm, it is preferable to contain an antiblocking agent or a slip agent. Examples of antiblocking agents include inorganic particles such as silica and zeolite, and the average particle diameter (volume-based average particle diameter (D) measured by a laser diffraction / scattering type particle size distribution measuring device) is 100 μm. 50 )) is preferably 1 to 30 μm and is nearly spherical. Examples of slip agents include fatty acid amides, and higher fatty acid monoamides such as stearic acid amide are preferred. At least one of these is preferably contained in an amount of, for example, 500 ppm or more, and more preferably 600 ppm or more, relative to the resin component of the LLDPE layer. The thickness of this LLDPE layer may be 20 μm or more and 150 μm or less. When the sealant layer 200 includes two or more LLDPE layers, this thickness is the total thickness of the layers.

[0036] Moreover, the EVOH layer contained together with the LLDPE layer more preferably has an ethylene unit content of 25 to 40 mol % and a degree of saponification of 95 mol % or more. Furthermore, in addition to the above effects, the EVOH layer can impart gas barrier properties to the main body constituting sheet material 20. In other words, it can prevent the aroma components (volatile components) of the contents contained in the containing area 60 surrounded by the main body constituting sheet material 20 from escaping to the outside of the container. The gas barrier properties are not limited, but are preferably at least 100 mL / m at 20°C and 65% RH. 2 ·day·atm or less (measured using a MOCON OX-TRAN2 / 21ML in accordance with a method conforming to JIS K7126), and 2 ·day·atm or less is preferable, and 10mL / m 2 ·day·atm or less is more preferable, and 5mL / m 2 It is even more preferable that the temperature is 100°C or less. The thickness of this EVOH layer may be 5 μm or more and 20 μm or less. When the sealant layer 200 includes two or more EVOH layers, this thickness is the total thickness of the layers.

[0037] Furthermore, as described above, the sealant layer 200 of the main body constituting sheet material 20 has a puncture strength of 6N or more, a puncture elongation of 8mm or more, and a thickness (the total thickness of the sealant layer 200 including the deposition layer and adhesive layer formed on the surface and between layers, for example, D in Figs. 6 and 7) of 200μm or less. The pouch container 100 according to this embodiment including the container body 10 formed by the main body constituting sheet material 20 including such a sealant layer 200 has improved drop resistance while having the container body 10 formed by a relatively thin sheet material due to the synergistic effect of the sealant layer 200 of the container body 10 having both high puncture strength and puncture elongation and the covering body 30 described later. Furthermore, the puncture resistance of the pouch container 100 is likely to be improved. The puncture strength and puncture elongation are both measured by a puncture test conforming to JIS Z 1707: 2019. Specifically, as shown in Fig. 8, a metal needle (puncture rod 600) with a tip of φ1 mm and a corner R of 0.5 mm is pierced into the sealant layer 200 (sheet material sample 602) at a puncture speed of 50 mm / min, and the maximum load when the puncture rod 600 penetrates the sheet material sample 602 is the puncture strength (N), and the elongation of the sealant layer 200 when the puncture strength is measured (when the maximum load is applied) (the linear distance that the part of the sheet material sample 602 that the metal needle 600 contacts extends from the position before the metal needle 600 contacts until it penetrates, L in Fig. 8) is the puncture elongation (mm).

[0038] The puncture strength of the sealant layer 200 of the main body constituting sheet material 20 is more preferably 7N or more, and even more preferably 8N or more. The puncture elongation is more preferably 9mm or more, more preferably 10mm or more, and even more preferably 11mm or more. This is because a pouch container 100 with improved drop resistance can be obtained in any of these cases. Furthermore, from the viewpoint of reducing the amount of plastic material used, the thickness D is more preferably 180μm or less, more preferably 150μm or less, and even more preferably 120μm or less. Even if the sealant layer 200 of the main body constituting sheet material 20 forming the container body 10 is such a thin wall, the drop resistance of the obtained pouch container 100 is maintained at a high level due to the synergistic effect with the covering body 30 described later. In addition, the puncture resistance is also easily maintained at a high level. The lower limit of this thickness may be 40μm or more, 60μm or more, or 80μm or more.

[0039] The sealant layer 200 of the main body sheet material 20 is preferably an embodiment in which the melting point of the thermoplastic resin constituting the outermost layer 201 (the layer that is arranged most externally of the container among the layers composed of thermoplastic resin at the time of bag making, see FIG. 6) arranged on the outermost side of the sealant layer 200, as measured by a differential scanning calorimeter (DSC), is higher by 10° C. or more, more preferably 15° C. or more, and even more preferably 20° C. or more than the melting point of the thermoplastic resin constituting the innermost layer 205 (the layer that is arranged most internally of the container among the layers composed of thermoplastic resin at the time of bag making, see FIG. 6) arranged on the innermost side of the sealant layer 200, as measured by a differential scanning calorimeter (DSC). This is because when the main body sheet material 20 is made into a bag to form the container body 10, the bag making workability by heat sealing is further improved. For example, when the above-mentioned mLLDPE layer (having a melting point of about 95°C or more and 105°C or less as measured by a differential scanning calorimeter (DSC)) is arranged as the innermost layer 205, the outermost layer 201 may be an HDPE layer (having a melting point of about 125°C or more and 135°C or less as measured by a differential scanning calorimeter (DSC)) or a polymerized layer having a density of 0.880 g / cm3 other than that of a metallocene catalyst. 3 More than 0.925g / cm3 It is preferable to dispose an LLDPE layer (having a melting point of about 110°C or more and 120°C or less as measured by a differential scanning calorimeter (DSC)) constituted by linear short-chain branched low-density polyethylene as described below. The heat sealing conditions when forming a bag by heat sealing can be appropriately set depending on the properties of the thermoplastic resin constituting the sealant layer 200 of the main body constituting sheet material 20, and examples thereof include the same conditions as those described above.

[0040] Furthermore, in an embodiment in which the sealant layer 200 of the main body-constituting sheet material 20 further includes the above-mentioned HDPE layer in addition to the above-mentioned EVOH layer and LLDPE layer, the puncture strength is likely to be increased and the moisture barrier properties are also likely to be increased, which is preferable.

[0041] Furthermore, in an embodiment in which the sealant layer 200 of the main body-constituting sheet material 20 further includes the above-mentioned HDPE layer in addition to the above-mentioned EVOH layer and LLDPE layer, if this HDPE layer is the outermost layer 201 arranged on the outermost side of the sealant layer 200, that is, if an HDPE layer is arranged in the outermost layer 201 of the sealant layer 200 (the outermost layer 201 is an HDPE layer), not only is the puncture strength and moisture barrier properties likely to be increased, but the melting point difference with the thermoplastic resin constituting the innermost layer 205 arranged on the innermost side of the sealant layer 200 is likely to be 10°C or more, which is more preferable. 3 More than 0.925g / cm 3 Even when an LLDPE layer made of linear short-chain branched low density polyethylene having a melting point difference of 10° C. or more with respect to the thermoplastic resin constituting the innermost layer 205 is arranged, this is preferable because it is easy to make the melting point difference between the LLDPE layer and the thermoplastic resin constituting the innermost layer 205 10° C. or more.

[0042] In addition, since the sealant layer 200 of the main body-constituting sheet material 20 is more likely to have increased puncture strength and puncture elongation, it is more preferable that the innermost layer 205 arranged on the innermost side of the sealant layer 200 is the above-mentioned LLDPE layer, that is, that an LLDPE layer is arranged in the innermost layer 205. In particular, it is more preferable that the innermost layer 205 is the above-mentioned mLLDPE layer, and when an mLLDPE layer is arranged in the innermost layer 205, the melting point difference is easily made 10° C. or more by arranging an LLDPE layer other than the above-mentioned HDPE layer or mLLDPE layer as the outermost layer 201.

[0043] Furthermore, in the sealant layer 200 of the main body-constituting sheet material 20, an embodiment in which the above-mentioned EVOH layer is sandwiched between layers made of polyethylene is preferable because molding (lamination, etc.) of the sealant layer 200 is easy. Examples of polyethylene constituting the two layers sandwiching the EVOH layer include the above-mentioned LLDPE (including mLLDPE), HDPE, LDPE, OPE, BOPE, BioPE, modified PE, etc. In other words, an embodiment in which the EVOH layer is sandwiched between two layers made of at least one selected from the group consisting of these is preferable, and for example, an embodiment in which the EVOH layer is sandwiched between an HDPE layer and an mLLDPE layer, or an EVOH layer polymerized by a catalyst other than a metallocene catalyst and having a density of 0.880 g / cm 3 More than 0.925g / cm 3 The following embodiments may be used: an EVOH layer sandwiched between an LLDPE layer and an mLLDPE layer made of linear short-chain branched low-density polyethylene; an EVOH layer sandwiched between two mLLDPE layers; etc. In particular, from the viewpoints of drop resistance and gas barrier properties, an EVOH layer sandwiched between two mLLDPE layers is more preferable.

[0044] As long as the main body constituting sheet material 20 includes the sealant layer 200 as described above, it may further include a layer serving as a base material made of a thermoplastic resin on the outer side of the sealant layer 200. For example, as shown in FIG. 7, the main body constituting sheet material 20 may further include a base material layer 210 made of a thermoplastic resin and arranged and bonded on the outer side of the sealant layer 200 (the outer side of the main body constituting sheet material 20, the position that is on the outer side of the container than the sealant layer 200 when the main body constituting sheet material 20 is used to form the pouch container 100). The base material layer 210 is a layer (surface base material layer) that serves as a base material arranged and bonded on the outer side of the sealant layer 200, and this base material layer 210 can further increase the puncture strength and moisture barrier properties of the entire main body constituting sheet material 20 (container body 10). In addition, it is possible to further increase the self-supporting property and gripping property of the pouch container 100, and further increase the heat sealability of the main body constituting sheet material 20 during bag making. In this embodiment, the sealant layer 200 is disposed on the inner side of the base layer 210 in the main body-constituting sheet material 20 surrounding the storage area, so that the effect of improving drop resistance by the sealant layer 200 is fully exhibited. The base layer 210 is not limited, but is more preferably a layer stretched at least in a uniaxial direction or a layer stretched in a biaxial direction, since both the puncture strength and moisture barrier property described above are further increased, and is more preferably a uniaxially stretched HDPE layer or a biaxially stretched HDPE layer made of high-density polyethylene, and is particularly preferably a biaxially stretched HDPE layer. The stretch ratio of the uniaxial stretching is not limited, but is preferably 3 times or more and less than 12 times in a uniaxial direction (e.g., MD direction), and the stretch ratio of the biaxial stretching is preferably 3 times or more and less than 12 times in each of the biaxial directions (e.g., MD direction and TD direction). In addition, when these are HDPE layers, it is preferable that the main component is high-density polyethylene whose melting point measured by a differential scanning calorimeter (DSC) is 128°C or more. Here, "major component" means more than 50% by mass.The HDPE layer preferably contains 70% by mass or more of high-density polyethylene having the above melting point, more preferably 90% by mass or more, and even more preferably 95% by mass or more, and may be made of high-density polyethylene having the above melting point. With this configuration, the piercing strength of the entire body-constituting sheet material 20 can be 8N or more, further 9N or more, or 10N or more. The piercing strength is measured by the same method as described above, except that the entire body-constituting sheet material 20 including the base layer 210 and the sealant layer 200 is used as the sheet material sample 602 to be measured, rather than the sealant layer 200 alone. In an embodiment in which the body-constituting sheet material 20 includes the base layer 210, the above effect is sufficiently exhibited even if not only the thickness D of the sealant layer 200 but also the entire body-constituting sheet material 20 is 200 μm or less, so in an embodiment including the base layer 210, the thickness of the entire body-constituting sheet material 20 may be 200 μm or less, further 180 μm or less, or further 150 μm or less. Here, from the viewpoint of recyclability, it is preferable that the main body constituting sheet material 20 is made of a thermoplastic resin as a whole, and therefore the layer serving as a base material arranged on the outer surface side of the sealant layer 200, such as the above-mentioned base material layer 210, is also preferably made of a thermoplastic resin. In addition, since the sealant layer 200 is also a layer that can serve as a base material, an embodiment in which the main body constituting sheet material 20 is made of the sealant layer 200 (not including any layer serving as a base material other than the sealant layer 200) is also possible, and with such a configuration, the effects of drop resistance and puncture resistance provided by the sealant layer 200 are likely to be further improved.

[0045] Furthermore, in an embodiment in which the main body-constituting sheet material 20 includes the above-mentioned base layer 210, it is more preferable that the peel strength between the base layer 210 and the sealant layer 200 (the peel strength between the bonded base layer 210 and the outermost layer of the sealant layer 200) is smaller than the peel strength between the layers included in the sealant layer 200 (the peel strength between the layers including the laminated and bonded EVOH layer and LLDPE layer). When the pouch container 100 is dropped, the bond between the base layer 210 and the sealant layer 200 is more likely to peel off due to the impact than the laminated and bonded sealant layer 200, so that the effect of the sealant layer 200 is more likely to be exhibited when dropped, and the drop resistance of the pouch container 100 is more likely to be increased.

[0046] Such a configuration is exemplified by, but not limited to, an embodiment in which the sealant layer 200 of the main body constituting sheet material 20 is a coextrusion laminated film layer in which a plurality of layers are coextruded and laminated and bonded, and the base material layer 210 of the main body constituting sheet material 20 and the sealant layer 200 are bonded by a dry laminate adhesive layer 301 (a dry laminate film layer). In particular, since not only the drop resistance of the pouch container 100 but also the moisture barrier properties, puncture resistance, and heat sealability are more preferable, an embodiment in which the base material layer 210 is a uniaxially oriented HDPE layer or a biaxially oriented HDPE layer, and this uniaxially oriented HDPE layer or biaxially oriented HDPE layer is bonded to the sealant layer 200, which is a coextrusion laminated film layer, by a dry laminate adhesive layer 301 is more preferable. Here, the term "coextruded laminated film layer" refers to a multilayer film layer in which each resin or resin mixture used for each layer is heated and melted in a separate extruder, and then coextruded into a film shape while using an anchor layer (adhesive layer) with a thickness of less than 10 μm between the layers as necessary, and laminated and bonded. The term "dry laminate film layer" refers to a multilayer film layer in which at least one of the surfaces of the layers to be bonded is coated with an adhesive (dry laminate adhesive) diluted with a solvent, and then dried to volatilize the solvent to form a dry laminate adhesive layer 301, which is then laminated, and heated or pressed as necessary, to bond the layers with the dry laminate adhesive layer 301. As the dry laminate adhesive, a two-liquid reactive polyurethane adhesive is preferably used.

[0047] The body-constituting sheet material 20 thus configured is relatively thin, yet has improved drop resistance when the container body 10 is formed and combined with the covering body 30. The body-constituting sheet material 20 can be formed by a known laminated film manufacturing method, but from the viewpoint of improving productivity, it is more preferable that the body-constituting sheet material 20 is a film formed by inflation molding or T-die casting (for example, a stretched laminated film, a non-stretched co-extruded laminated film, a lamination film, or a combination of two or more selected from these). Here, "inflation molding" refers to a molding method in which molten resin is extruded from a round die (mold) into a film shape and air is blown in at the same time to form a bag shape. "T-die casting" refers to a molding method in which molten resin is extruded from a T-shaped die (mold) into a film shape. "Stretched laminate film" refers to a laminated resin film in which each resin film layer or resin mixture used in the sheet material is stretched (for example, uniaxially or biaxially stretched) and laminated, "unstretched coextruded laminate film" refers to a laminated resin film in which the resins constituting each resin film layer used in the sheet material are separately heated and melted, and are coextruded into a film shape while using an anchor layer (adhesive layer) with a layer thickness of less than 10 μm as necessary, and laminated without stretching, and "lamination film" refers to a laminated resin film in which each resin film layer used in the sheet material is laminated by heat sealing, adhesive layer, etc.

[0048] On the other hand, the covering sheet material 40 forming the covering body 30 of the pouch container 100 according to this embodiment is a paper sheet material composed of a paper layer 401. The covering sheet material 40 composed of this paper layer 401 may also include a printed layer, a protective layer (for example, a coating layer such as varnish), or the like on the surface or between layers.

[0049] The covering sheet material 40 formed by this paper layer 401 has a puncture strength of 6N or more. The puncture strength is preferably 8N or more, more preferably 9N or more, and even more preferably 10N or more. Here, the puncture strength is measured by the same method as described above, except that the covering sheet material 40 is used as the sheet material sample 602 to be measured. In addition, when the paper layer 401 has a multi-layer structure in which a plurality of paper layers are continuously laminated, it is sufficient that the puncture strength of the entire multi-layer structure (the entire covering sheet material 40) is 6N or more.

[0050] Furthermore, the basis weight of the paper layer 401 is not limited, but is set to 300 g / m from the viewpoint of cost and the like. 2 Preferably, it is 280 g / m or less.2 More preferably, it is 250 g / m or less. 2 More preferably, the lower limit is 50 g / m 2 It may be 70 g / m or more. 2 The thickness of the paper layer 401 is also not limited, but from the viewpoint of the container volume, it is preferably 2 mm or less, more preferably 1.5 mm or less, and even more preferably 1 mm or less. The lower limit may be 0.1 mm or more, or 0.3 mm or more. However, in this embodiment, the basis weight is 300 g / m 2 The paper layer 401 may be thicker than 2 mm (for example, a paper layer containing many voids).

[0051] Examples of the paper material constituting the paper layer 401 that can satisfy the above puncture strength include stretched paper (crepe paper, etc.) and Kent paper. The raw materials thereof include wood pulp such as pulp derived from softwoods, such as softwood bleached kraft pulp (NBKP) or softwood unbleached kraft pulp (NUKP), and pulp derived from hardwoods, such as hardwood bleached kraft pulp (LBKP), non-wood pulp such as cotton pulp and hemp pulp, and regenerated cellulose fibers such as cupra and rayon. From the viewpoint of durability, the paper layer 401 is preferably made of a paper material using NBKP or NUKP as a raw material, and more preferably made of a paper material using a relatively long fiber length (e.g., NBKP or NUKP with a fiber length of 0.5 mm or more) as a raw material.

[0052] The covering sheet material 40 made of such a paper layer 401 is used to form the covering body 30 that covers the container body 10 formed by the above-mentioned body-constituting sheet material 20, and by configuring it as described above, the resulting pouch container 100 (the pouch container 100 made of the container body 10 and the covering body 30) has improved drop resistance. Also, it is likely to have improved puncture resistance. The covering sheet material 40 can be obtained by a known paper sheet material manufacturing method, but from the viewpoint of improving productivity, it is more preferable that the paper layer 401 of the covering sheet material 40 is made of a paper material continuously formed by a papermaking machine. Furthermore, from the viewpoint of improving the productivity of not only the covering sheet material 40 but also the pouch container 100 of this embodiment, it is highly preferable that the main body-constituting sheet material 20 is a film formed by the above-mentioned inflation molding or T-die casting molding, and that the paper layer 401 of this covering sheet material 40 is composed of a paper material continuously formed by a papermaking machine.

[0053] Here, specific examples of the layers constituting the main body sheet material 20 and the covering sheet material 40 of the pouch container 100 according to this embodiment will be described in more detail with reference to Figs.

[0054] The main body constituting sheet material 20 and the covering sheet material 40 of the pouch container 100 according to this embodiment can be modified in various ways according to the characteristics required when the container body 10 and the covering body 30 are formed, the type of contents, etc., within the range satisfying the above-mentioned configuration. For example, the main body constituting sheet material 20 may be composed of a sealant layer 200 having a five-layer structure as shown in FIG. 6. In the embodiment of FIG. 6, the outermost layer 201 (layer 1) arranged on the outermost side and the central layer 203 (layer 3) arranged in the center are joined by an adhesive layer 202 (layer 2) made of an adhesive thermoplastic resin, and further, the central layer 203 (layer 3) and the innermost layer 205 (layer 5) arranged on the innermost side are joined by an adhesive layer 204 (layer 4) made of an adhesive thermoplastic resin. It is preferable to arrange an mLLDPE layer as the innermost layer 205, and it is preferable to arrange an EVOH layer as the central layer 203. Further, the outermost layer 201 is a mLLDPE layer, a HDPE layer, or a layer polymerized by a catalyst other than a metallocene catalyst and having a density of 0.880 g / cm 3 More than 0.925g / cm 3 It is preferable to arrange any one of the following LLDPE layers made of linear short-chain branched low-density polyethylene. In particular, it is more preferable that the innermost layer 205 is an mLLDPE layer and the outermost layer 201 is an HDPE layer. In addition, as the adhesive layers 202 and 204, a layer made of modified polyethylene (modified PE, for example, maleic anhydride grafted modified polyethylene) modified (modified) by graft polymerization using maleic acid or the like is shown as a preferred example. In particular, an adhesive layer made of maleic anhydride grafted modified polyethylene is very suitable for bonding an EVOH layer and an LLDPE layer (including an mLLDPE layer).

[0055] As in the embodiment of Fig. 6, an embodiment in which the EVOH layer is sandwiched between two layers selected from LLDPE layers or HDPE layers is more preferable, and an embodiment in which the EVOH layer is sandwiched between mLLDPE layers is particularly preferable. Here, "sandwiched between two layers" means that the EVOH layer is laminated and disposed between two specific thermoplastic resin layers, and another thermoplastic resin layer (such as an adhesive layer) may be included between these two thermoplastic resin layers. The same applies to other embodiments. In the embodiment of FIG. 6, for example, a protective layer or the like may be further formed on the surface of the outermost layer 201 of the sealant layer 200.

[0056] The main body sheet material 20 may be, for example, an embodiment as shown in FIG. 7. In the embodiment of FIG. 7, a sealant layer 200 having the same configuration as that of FIG. 6 is disposed on the inner surface side (the side of the storage area when forming the container body 10), and a base layer 210 is laminated on the outer surface side and joined to the sealant layer 200 (the outermost layer 201) by a dry laminate adhesive layer 301. That is, the main body sheet material 20 includes the sealant layer 200 and the base layer 210. In this embodiment, each layer of the sealant layer 200 is preferably the same as that of the embodiment of FIG. 6. As described above, the base layer 210 is preferably a layer stretched at least in a uniaxial direction or a layer stretched in a biaxial direction, more preferably a uniaxially stretched HDPE layer or a biaxially stretched HDPE layer, and particularly preferably a biaxially stretched HDPE layer. In addition, an embodiment in which a protective layer or the like is further formed on the surface of the base layer 210 may be used.

[0057] Furthermore, the covering sheet material 40 may be a single-layer structure of a paper layer as shown in Figures 6 and 7, or may be a multi-layer structure in which multiple paper layers made of the same or different types of paper materials are continuously laminated as long as the puncture strength is greater than or equal to a predetermined value. The sealant layer 200 of the main body sheet material 20 described above is not limited to the five-layer structure shown in Figures 6 and 7, but may be a four-layer structure, six-layer structure, seven-layer structure, etc., as long as it includes the above-mentioned EVOH layer and LLDPE layer, has a predetermined puncture strength and puncture elongation, and is less than a predetermined thickness. The base material layer 210 of the main body sheet material 20 is also not limited to the single-layer structure shown in Figure 7. In the embodiment of FIG. 6 and FIG. 7, a protective layer or the like may be further formed on the surface of the covering sheet material 40.

[0058] Then, the container body 10 can be produced, for example, by using the above-mentioned body-constituting sheet material 20, by the following method: First, the body-constituting sheet material 20 is folded into the shape of the container body 10 in a region including the front surface-constituting sheet part 21, the rear surface-constituting sheet part 23, and the bottom surface-constituting sheet part 22, with the outermost layer 201 being disposed outside (on the outside of the container) relative to the innermost layer 205, and at least a part of the sealant layers 200 on the periphery is joined together by heat sealing or the like to form the side seal parts 11, etc., while the body-constituting sheet material 20 is bagged and cut so that it surrounds the storage area 60. Then, a front lower skirt sheet 18b and a rear lower skirt sheet 18c of the configuration described above are formed on the lower side of the side seal portion 11, and the side edges of the front lower skirt sheet 18b and the rear lower skirt sheet 18c are joined together by heat sealing or the like to form the skirt seal portion 18a, thereby forming the skirt portion 18 of the configuration described above.Furthermore, if necessary, an opening 15 such as a spout is provided, and unnecessary portions are cut away to form the container body 10 (see Figures 4 and 5).

[0059] On the other hand, the pouch container 100 of this embodiment can be produced by producing the covering body 30 using the covering sheet material 40 as described above, for example, by the following method. First, the covering sheet material 40 is cut into a predetermined shape (a shape including at least the front covering portion 31 and the rear covering portion 32), and if necessary, an insertion hole 46 for inserting the opening 15 and a glued portion 41 are formed, and the covering body 30 is formed by wrapping the covering sheet material 40 around the container body 10 and gluing, etc., and if necessary, the container body 10 and the covering body 30 are partially bonded to form the pouch container 100 of this embodiment (see Figs. 1 to 3). In the region where the covering body 30 and the container body 10 are combined (the region where the covering sheet material 40 and the main body sheet material 20 overlap, such as the trunk portion 16), the puncture strength can be set to 10 N or more, further 12.5 N or more, and further 14 N or more. As described above, the drop resistance of this pouch container 100 is improved. Here, this puncture strength is measured by the same method as described above, except that a composite sheet material in which the covering sheet material 40 and the main body sheet material 20 overlap is used as the sheet material sample 602 to be measured.

[0060] [Recycling pouch containers] Next, recycling of the pouch container 100 according to this embodiment will be described in detail.

[0061] The pouch container 100 according to this embodiment, in which the contained contents have been used up, is crushed and collected as necessary. Then, before or after the collection, the covering body 30 is separated from the container body 10. In the case of the pouch container 100 having the spout described above, the spout may also be separated from the container body 10. Then, the container body 10 thus obtained is subjected to cleaning of the containing area 60, etc., as necessary.

[0062] Next, recycled resin (resin pellets, etc.) which is a recycled material is formed using the obtained container body 10. For example, the container body 10 or its shredded material (cleaned shredded material, etc.) can be melted and extruded, pressed, etc. to form resin pellets (recycled resin pellets).

[0063] In addition, new resin raw material (virgin resin raw material) may be used as the main raw material and mixed with a melt of the aforementioned container body 10 or its shredded material to form a recycled resin. However, for example, if the sealant layer 200 of the body-constituting sheet material 20 that forms the container body 10 is made of a polyethylene-based resin, it is very preferable to use the container body 10 as the main raw material, as this makes it possible to obtain a high-quality recycled material. Here, "main raw material" means that its proportion in the recycled resin-forming raw materials is more than 50% by mass, and may be 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 100% by mass.

[0064] The recycled resin thus obtained can be used to form a part of the main body sheet material 20 forming the container body 10 of the pouch container 100 according to the present embodiment. When using this recycled resin, it is preferable to form a layer of the main body sheet material 20 that does not directly contact the contents (for example, the outermost layer 201 of the sealant layer 200 in the embodiment of FIG. 7, the base layer 210, or a resin layer disposed on the outer side of the base layer 210). The container body 10 formed from the main body sheet material 20 including the recycled film layer thus obtained is preferable because the contents do not directly contact this recycled film layer, and even if a small amount of impurities are contained in the recycled film layer, the impurities are unlikely to migrate to the contents. In addition, the above-mentioned recycled resin can be used to form at least a part of a pouch container other than the pouch container 100 according to the present embodiment, and can also be used to form at least a part of another resin product.

[0065] Furthermore, the paper layer 401 constituting the covering body 30 (covering sheet material 40) may also be recycled into recycled paper. In that case, for example, the covering body 30 including the separated paper layer 401 is mixed with warm water and chemicals, roughly dissolved, and held for a certain period of time, and in a subsequent process, materials other than the paper material are removed using a screen separator or the like, and if necessary, printing materials (dyes, pigments, etc.) are removed from the liquid pulp raw material by a deinking process using air bubbles or chemicals, and further sterilization and bleaching are performed, and recycled paper is manufactured using the obtained pulp.

[0066] Hereinafter, examples of the present invention will be described, however, the present invention is not limited to the following examples, and various modifications are possible within the technical concept of the present invention. EXAMPLES

[0067] The covering sheet material shown in the top row of Table 1 below was combined with the main body sheet material shown in the middle row of Table 1 below to produce samples of a composite sheet material (a composite sheet material in which a covering sheet material and a main body sheet material are laminated) and a pouch container (a pouch container in which the entire surface of the container body formed by the main body sheet material, excluding the opening, is covered by a sleeve-shaped covering body formed by the covering sheet material, the container body and the covering body are not joined as a whole, and part of the covering body is in contact with the body) (Table 1 below). Note that in Table 1 below, metallocene-catalyzed linear short-chain branched low-density polyethylene is referred to as mLLDPE, and linear short-chain branched low-density polyethylene polymerized with a catalyst other than metallocene is simply referred to as LLDPE.

[0068] The covering sheet materials used for each sample were all composed of the paper layer shown in the upper part of Table 1 below, and the basis weight and puncture strength in the upper part of Table 1 below are data relating to the covering sheet material composed of this paper layer.

[0069] The main body sheet material used for each sample is, for Sample 1-1 and Samples 2-11, a sealant layer which is a coextruded laminated film layer in which Layers 1-5 made of polyethylene resin are laminated as shown in the middle of Table 1 below and bonded by coextrusion as shown in FIG. 6. For Sample 1-2 and Sample 1-3, a sealant layer which is a coextruded laminated film layer in which Layers 1-5 made of polyethylene resin are laminated and bonded by coextrusion as shown in FIG. 7, and a base material layer made of medium-low pressure high density polyethylene shown in the middle of Table 1 below (Sample 1-2 is Hibron P25 (uniaxially oriented HDPE, melting point measured by differential scanning calorimeter (DSC) is 132°C: manufactured by Tokyo Ink Co., Ltd.), and Sample 1-3 is 25HD200 (biaxially oriented HDPE, melting point measured by differential scanning calorimeter (DSC) is 130°C: manufactured by Jindal Poly Films Ltd.)) which are laminated as shown in FIG. 7 and bonded by dry lamination. In addition, layer 3 of the sealant layer in all samples was an EVOH layer composed of an ethylene-vinyl alcohol copolymer (EVAL (registered trademark) F171B: manufactured by Kuraray Co., Ltd., ethylene unit content 32 mol %, saponification degree 99.9 mol % or more), and layers 2 and 4 in all samples were adhesive layers (Admer (registered trademark) NF518: manufactured by Mitsui Chemicals Co., Ltd.) composed of adhesive polyethylene, maleic anhydride grafted modified polyethylene (referred to as maleic anhydride modified PE in Table 1 below). Furthermore, layer 5 of the sealant layer is an mLLDPE layer made of metallocene-catalyzed linear short-chain branched low-density polyethylene in Samples 1-1 to 1-3, Samples 2 to 3, Samples 5 to 8, and Sample 11. Specifically, the mLLDPE layer of layer 5 in Samples 1-1 to 1-3, Samples 5 to 8, and Sample 11 is made of Evolue (registered trademark) SP0510 (a copolymer of ethylene and 1-hexene, having a melting point of 98°C and a density of 0.903 g / cm3 as measured by a differential scanning calorimeter (DSC)). 3The mLLDPE layer of layer 5 of sample 2 was Elite® AT6101 (a copolymer of ethylene and 1-octene, with a melting point of 101° C. and a density of 0.905 g / cm 3 as measured by differential scanning calorimetry (DSC)). 3 The mLLDPE layer of layer 5 of sample 3 was Evolue® SP1510 (a copolymer of ethylene and 1-hexene, with a melting point of 118°C and a density of 0.915 g / cm3 as measured by differential scanning calorimetry (DSC)). 3 The layer 5 of Samples 4 and 9 is an LLDPE layer made of medium-low pressure linear short-chain branched low-density polyethylene. Specifically, the LLDPE layer of Layer 5 of Sample 4 is Novatec (registered trademark) LL UF240 (a copolymer of ethylene and 1-butene, having a melting point of 123°C and a density of 0.920 g / cm3 as measured by a differential scanning calorimeter (DSC)). 3 The LLDPE layer of layer 5 of sample 9 was Novatec® LL UF943 (a copolymer of ethylene and 1-butene, with a melting point of 127°C and a density of 0.938 g / cm3 as measured by differential scanning calorimetry (DSC)). 3 The layer 5 of the sample 10 is an LDPE layer made of a high-pressure low-density polyethylene, specifically, Novatec (registered trademark) LD LJ400 (having a melting point of 108°C and a density of 0.921 g / cm3 as measured by a differential scanning calorimeter (DSC)). 3 (Manufactured by Japan Polyethylene Corporation). In addition, except for Samples 2 to 4 and Samples 9 to 10, stearic acid amide was added as a slip agent to layer 5 of the sealant layer in an amount of 800 ppm relative to the resin component. Layer 1 of the sealant layer had the same structure as Layer 5 except for Samples 5 and 6. Layer 1 of Sample 5 was an LLDPE layer made of medium-low pressure linear short-chain branched low-density polyethylene (ULT-ZEX (registered trademark) 1520L (a copolymer of ethylene and 1-hexene, having a melting point of 115°C and a density of 0.914 g / cm3 as measured by a differential scanning calorimeter (DSC)). 3Layer 1 of sample 6 is an HDPE layer made of medium-low pressure high density polyethylene (HI-ZEX (registered trademark) 5000SR (melting point measured by differential scanning calorimetry (DSC) is 131 °C, density is 0.954 g / cm 3 ): manufactured by Prime Polymer.

[0070] The thickness, puncture strength, and puncture elongation in the middle of Table 1 below are data for these main body sheet material samples (samples 1-2 and 1-3 include a base layer). Therefore, since the sealant layers of samples 1-2 and 1-3 have the same structure as those of samples 1-1, 7, 8, and 11, the thickness, puncture strength, and puncture elongation of these sealant layers can be said to be the same as those of samples 1-1, 7, 8, and 11.

[0071] These covering sheet materials were laminated on the side of the main body sheet material on which Layer 1 was disposed in the combinations shown in Table 1 below to form a composite sheet material, and the puncture strength of this composite sheet material was measured. A container body was formed using the body-constituting sheet materials in the combination shown in Table 1 below, with layer 5 being disposed on the inside of the container (the storage area side), and a sleeve-shaped cover was formed using a covering sheet material to cover the container body, forming a pouch container. Water was then placed inside (the storage area) and sealed, and a drop test was performed.

[0072] The piercing strengths were measured by a piercing test conforming to JIS Z 1707:2019, with the piercing direction being from the layer 1 side for the main body constituent sheet material and from the covering sheet material side for the composite sheet material. The piercing direction for the covering sheet material alone was also from the same side as when measuring the composite sheet material. Specifically, as shown in FIG. 8, a jig with a piercing rod (reference number 600 in FIG. 8) was first installed on the installation board on the top of the measuring device, and each sheet material sample (reference number 602 in FIG. 8) was fixed to the lifting platform. Then, the position was adjusted so that the approximate center of the exposed surface of each sheet material sample would hit the tip of the piercing rod. The piercing rod was a metal needle with a tip of φ1 mm and a corner R0.5 mm, and the lifting speed (piercing speed) of the lifting platform was 50 mm / min. Then, the lifting platform was raised to measure the piercing strength (N), which is the maximum load until the piercing rod penetrates each sheet material sample (N in FIG. 8). The puncture elongation of the sheet material constituting the main body is the elongation (mm) of the sheet material constituting the main body when the puncture strength is measured (when the maximum load is applied), and more specifically, it is the linear distance that the part of the sheet material constituting the main body that comes into contact with the metal needle extends from the position before the metal needle comes into contact to the point where it penetrates (L in Figure 8).

[0073] Furthermore, to evaluate drop resistance, five of each pouch container, each of which was sealed with water inside (the storage area), were prepared and dropped from a height of 1 m (N=5). Those that did not break even once were marked as ◯, those that broke once or twice were marked as △, and those that broke three or more times were marked as ×.

[0074] The puncture strength of each composite sheet material and the drop resistance evaluation of each pouch container are also shown in the lower part of Table 1 below. From these results, it was found that the covering sheet material was made of a paper layer and had a puncture strength of 6N or more, an EVOH layer having an ethylene unit content of 32 mol% and a saponification degree of 99.9 mol% or more, a puncture strength of 6N or more and a puncture elongation of 8 mm or more, and a density of 0.880 g / cm 3 More than 0.925g / cm 3The composite sheet material and pouch container (Samples 1-1 to 1-3, Samples 2 to 8) that combine the main body sheet material containing a sealant layer having a thickness of 100 μm or less including an LLDPE layer having a thickness of 100 μm or less showed improved drop resistance of the pouch container, and the puncture strength of the composite sheet material was also high at over 11 N. Samples 1-2 and 1-3, which use the main body sheet material containing the base layer of the above-mentioned configuration, show a slightly reduced puncture elongation as the main body sheet material, but the drop resistance is maintained due to the configuration of the sealant layer, and in particular, the drop resistance of Sample 1-3, which contains the biaxially oriented HDPE layer as the base layer, was maintained at a higher level. In other words, it was shown that if the sealant layer of the main body sheet material has the above-mentioned configuration, a flexible pouch container with improved drop resistance can be obtained by combining it with a specified covering body. On the other hand, the density of the sealant layer of the sheet material constituting the main body is 0.880 g / cm 3 More than 0.925g / cm 3 In the following Samples 9 and 10, which did not contain an LLDPE layer, the drop resistance of the formed pouch containers was low, and in Sample 11, in which the covering sheet material had a puncture strength of less than 6 N, the resulting composite sheet material had a low puncture strength of less than 10 N.

[0075] [Table 1] [Explanation of symbols]

[0076] 10 Container body 11 Side seal 13 Bottom gusset 14 Top gusset 15 Opening 16 Torso 18 Skirt Club 18a Skirt seal part 18b Front lower skirt sheet 18c Rear lower skirt sheet 20 Body construction sheet material 21 Front component sheet part 22 Bottom construction sheet part 23 Rear component seat section 24 Top surface sheet section 26 Skirt sheet composition area 30 Covering 31 Front cover part 32 Rear cover part 33 Top cover 34 Bottom covering part 40 Covering sheet material 41 Gluing section 43 Joint 46 Insertion hole 50 Cap 60 Containment Area 100 pouch container 200 Sealant Layer 201 Outermost layer (layer 1) 202 Adhesive layer (layer 2) 203 Central layer (layer 3) 204 Adhesive layer (layer 4) 205 Innermost layer (layer 5) 210 Base material layer 301 Dry laminate adhesive layer 401 Paper layer of covering sheet material 600 piercing rod (metal needle) 602 Sheet material sample

Claims

1. A flexible pouch container comprising: a container body having a front surface, a rear surface, and a bottom surface, the container body being formed by bagging a body-constituting sheet material so as to have a storage area inside; and a covering body covering the container body, the covering body being formed by a covering sheet material, The sheet material constituting the main body includes a sealant layer made of a thermoplastic resin, and the inner surfaces of the sheet materials constituting the main body are opposed to each other and joined together by the sealant layers to form a bag, The sealant layer comprises an EVOH layer made of an ethylene-vinyl alcohol copolymer having an ethylene unit content of 20 to 50 mol% and a saponification degree of 90 mol% or more, and a polyethylene terephthalate layer having a density of 0.880 g / cm 3 0.925g / cm or more 3 a plurality of layers including an LLDPE layer made of a linear short-chain branched low-density polyethylene having a puncture strength of 6 N or more, a puncture elongation of 8 mm or more, and a thickness of 200 μm or less; The covering sheet material is made of a paper layer and has a puncture strength of 6N or more, A pouch container, wherein the covering body covers at least the entire axial circumference of the body portion that constitutes the front and rear surfaces of the container body, and is in unbonded contact with the body-constituting sheet material on the outer peripheral surface of the body portion, or is partially bonded to the body-constituting sheet material on the outer peripheral surface of the body portion.

2. 2. The pouch container according to claim 1, wherein the LLDPE layer is a mLLDPE layer composed of metallocene-catalyzed linear short-chain branched low-density polyethylene.

3. 3. The pouch container according to claim 1, wherein the main body-constituting sheet material includes a base layer made of a thermoplastic resin and disposed on an outer surface side of the sealant layer and bonded thereto.

4. The pouch container according to claim 3, wherein the substrate layer is a layer stretched in at least one direction.

5. The pouch container according to claim 3, wherein the substrate layers are biaxially stretched layers.

6. 4. The pouch container according to claim 3, wherein the base layer is a layer containing, as a main component, high-density polyethylene having a melting point of 128°C or higher as measured by a differential scanning calorimeter (DSC).

7. The pouch container according to claim 3 , wherein the peel strength between the base layer and the sealant layer is lower than the peel strength between layers contained in the sealant layer.

8. 4. The pouch container according to claim 3, wherein the sealant layer is a coextruded laminated film layer that is coextruded, laminated, and bonded, and the base material layer and the sealant layer are bonded together by a dry lamination adhesive layer.

9. 3. The pouch container according to claim 1, wherein the melting point of the thermoplastic resin constituting the outermost layer of the sealant layer of the main body-constituting sheet material, as measured by a differential scanning calorimeter (DSC), is 10°C or more higher than the melting point of the thermoplastic resin constituting the innermost layer of the sealant layer, as measured by a differential scanning calorimeter (DSC).

10. 3. The pouch container according to claim 1, wherein the sealant layer of the main body-constituting sheet material has an innermost layer that is the LLDPE layer.

11. 3. The pouch container according to claim 1, wherein the sealant layer of the main body-constituting sheet material is disposed such that the EVOH layer is sandwiched between the LLDPE layers.

12. The sealant layer of the main body-constituting sheet material further comprises an outermost layer arranged on the outermost side of the sealant layer, the outermost layer having a density of 0.940 g / cm 3 The pouch container according to claim 1 or 2, comprising an HDPE layer made of the above high-density polyethylene.

13. 3. The pouch container according to claim 1, which is a standing pouch that can stand on its own when placed on a placing surface with the bottom surface facing downwards and with an item accommodated in at least the accommodation region.

14. The container body has a side seal portion formed by joining the sealant layers of the body-constituting sheet material constituting the front surface and the body-constituting sheet material constituting the rear surface at side edge portions on opposing inner surfaces, an upper side of the container body has a top surface formed from the body-constituting sheet material and connecting the front surface and the rear surface, the top surface having an opening that can accommodate and discharge the contents and can be sealed; The pouch container according to claim 13, wherein both the top surface and the bottom surface have a foldable gusset structure.

15. A containerized product comprising the pouch container according to claim 1 or 2 and an item contained in the containing area of ​​the pouch container.

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