Sheet material container

Abstract

To provide sheet material containers excellent in impact resistance.SOLUTION: A sheet material container 1 is formed of a sheet material made by laminating multiple film materials, and a support part 7 is formed by encapsulating a filler material in a non-adhesive region 59 formed between the layers of the multiple film materials. The non-adhesive region 59 is provided along peripheral edges of a front part 3a, a back part 3b, and a bottom part 4. In the sheet material container 1, in a state where the filler material is encapsulated in the non-adhesive region 59 and the sheet material container 1 is filled with content liquid 61, a cross-sectional shape in a direction perpendicular to an axial direction of the support part 7 is circular, with a diameter of 20 mm or more, and a side surface part 3c projects outward from the support part 7 in both the front part 3a and the back part 3b over the entire region in a height direction Z when viewed from the front part 3a, and an outer edge shape of the side surface part when viewed from the front part 3a is non-linear.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] In recent years, from the viewpoint of reducing the environmental load, sheet material containers are required to reduce the amount of synthetic resin used in the containers and to improve recyclability. For example, Patent Document 1 proposes a sheet material container formed using a thin sheet material made of synthetic resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2015-522442 Summary of the Invention [Problem to be solved by the invention]

[0004] It is preferable that a sheet material container made of synthetic resin has excellent impact resistance when dropped. However, for example, if the amount of synthetic resin used in the film material is reduced or the film material is made from a single synthetic resin (monomaterial), the impact resistance when dropped decreases, and the same strength as conventional sheet material containers cannot be obtained, which tends to make them less user-friendly. The sheet material container described in Patent Document 1 also has room for improvement in terms of impact resistance.

[0005] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet material container that is excellent in impact resistance. [Means for solving the problem]

[0006]

[0006] As a result of intensive research conducted by the inventors to solve the above problems, it was discovered that impact resistance can be dramatically improved by forming a sheet material container into a specific shape. The present invention was made based on this discovery and relates to a sheet material container formed of a sheet material in which a plurality of film materials are laminated, the sheet material container having a body portion having a front portion, a back portion facing the front portion, and side portions interposed between the front portion and the back portion, and a bottom portion located at the lower end of the body portion, and a support portion formed by sealing a filler in a non-adhesive region formed between the layers of the plurality of film materials. In one embodiment, the non-adhesive regions are preferably provided along the peripheries of the front portion, the back portion and the bottom portion. In one embodiment, when a filler is sealed in the non-adhesive region and the sheet material container is filled with a liquid content, it is preferable that the cross-sectional shape of the support portion in a direction perpendicular to the axial direction is circular and has a diameter of 20 mm or more, and that the side portion protrudes outward beyond the support portion in the front portion and the back portion over the entire height direction of the body portion when viewed from the front portion side, and that the outer edge shape of the side portion when viewed from the front portion side is non-linear. [Effects of the Invention]

[0007] The present invention relates to providing a sheet material container having excellent impact resistance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view showing the form of a sheet material container formed by joining sheet materials. [Figure 2] FIG. 2 is a schematic front view of the sheet material container shown in FIG. [Figure 3] 3(a) to 3(c) are exploded views for explaining the structure of the sheet material forming the sheet material container shown in FIG. [Figure 4] FIG. 4 is a schematic plan view showing the layer structure of the sheet material forming the sheet material container shown in FIG. [Figure 5]FIG. 5 is a schematic development view illustrating the configuration of the support portion formed on the sheet material. [Figure 6] FIG. 6 is a schematic cross-sectional view showing the state before the non-adhesive region is filled with a filler and before the content liquid is contained in the containing portion. [Figure 7] FIG. 7 is a schematic cross-sectional view taken along line AA in FIG. [Figure 8] FIG. 8 is a schematic cross-sectional view of a sheet material containing a liquid content in a container according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below based on preferred embodiments with reference to the drawings. As shown in Figures 1 and 2, the sheet material container 1 includes a container body 10 that contains a liquid content therein, and a spout portion 18 fixed to an upper portion 2 of the container body 10. The container body 10 has an upper portion 2, a bottom portion 4, and a body portion 3. The body portion 3 has a front portion 3a, a back portion 3b, and a side portion 3c. The front portion 3a and the back portion 3b face each other, and the side portion 3c is interposed between the front portion 3a and the back portion 3b. The sheet material container 1 has a bottom portion 4 at the lower end of the body portion 3, and can stand on its own when the bottom 4 is placed on a placing surface. For ease of explanation, the side on which the opening 55 for introducing the filler into the non-adhesive region 59 is formed is referred to as the back portion 3b. The sheet material container 1 of this embodiment has a front-rear direction Y in which the front portion 3a and the back portion 3b face each other, and a width direction X perpendicular to the front-rear direction Y. It also has a height direction Z perpendicular to the front-rear direction Y and the width direction X. When the bottom portion 4 is placed on a placement surface with the bottom portion 4 in contact with the ground, the height direction Z coincides with the vertical direction. That is, the bottom portion 4 of the container body 10 faces downward, and the opposite side of the bottom 4 in the height direction Z of the sheet material container 1 (for example, the side of the spout portion 18) faces upward. Unless otherwise specified, the following description of the sheet material container 1 of the embodiment shown in Figures 1 to 7 will be a description of the sheet material container 1 in a freestanding state.

[0010] The container body 10 is made of a sheet material in which multiple film materials are laminated, and the edges of the sheet material are joined to form a joint 6, thereby forming a storage section 8 capable of storing the liquid content therein. The container body 10 has the joint 6 formed in the center of the side surface 3c in the front-to-rear direction Y. A spout section 18 is attached to the top 2 of the container body 10. A dispenser (not shown) can be attached to the spout section 18 to suck up the liquid content inside the container. A support section 7 is formed inside the sheet material container 1 to ensure its posture when it is standing upright and to increase its rigidity.

[0011] The liquid contents to be contained in the sheet material container 1 include, but are not limited to, liquid hair care products such as shampoo and hair rinse, liquid soaps such as body soap and hand soap, liquid detergents for clothes or dishes, fabric softeners, seasonings, cosmetics such as lotions, beverages, liquid foods, and pharmaceuticals such as disinfectant alcohol.

[0012] 3(a) to 3(c) show the sheet material 5 in an unfolded state, and FIG. 4 shows the layer structure of the sheet material 5. The sheet material 5 is elongated in one direction, and the outer edge of the portion corresponding to the body 3 is rounded. The sheet material 5 is formed by laminating multiple film materials 51, 52, and 53. The film material 51 is the outer sheet of the sheet material container 1, the film material 52 is the middle sheet, and the film material 53 is the inner sheet. The film material 51 forms the outer surface of the sheet material container 1, and the film material 53 forms the inner surface of the sheet material container 1. The sheet material 5 is formed by laminating the film material 52 and the film material 53 in an unfolded state in this order on the film material 51 in an unfolded state. The sheet material 5 has multiple folding points formed in it that are folded in to transform it into a container shape from an unfolded state. The first folding points 56, 56 are formed on one end side of the sheet material 5 in an unfolded state. The sheet material 5 is folded in half at first folds 56, 56 to form the upper portion 2 of the sheet material container 1. The second folds 57, 57 and the third folds 58, 58 are formed facing each other at approximately the center of the longitudinal direction of the sheet material 5. The sheet material 5 is folded in thirds at the second folds 57, 57 and the third folds 58, 58, and the sheet material 5 is joined along the periphery of the sheet material 5 using a known adhesive or thermal welding to form a joint 6, and the bottom portion 4, front portion 3a, back portion 3b, side portions 3c, and upper portion 2 of the sheet material container 1 are formed. The sheet material 5 is not limited to a three-layer structure and may be a two-layer structure in which film material 51 and film material 52 are laminated, or a four-layer or more structure in which another film material is laminated on film material 53. In FIG. 3(a), the region in which a non-adhesive region 59 (described later) is formed is indicated by the reference numeral 59.

[0013] It is preferable that the film materials 51, 52, and 53 are all made of a single resin. Examples of film materials 51, 52, and 53 include, but are not limited to, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and nylon (Ny). However, from the viewpoint of improving recyclability by using a single material, it is preferable to use an olefin-based material such as polyethylene or polypropylene. These may also be biomass materials. In this embodiment, "single resin" means that the raw material of the film is a single resin, that is, a material whose molecular structure has the same (common) molecular skeletons of the main chain and side chains. For example, high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (ULDPE) are all polymers having a repeating skeleton of methylene groups (-CH-), that is, polyethylene, and are all included in the category of single resin. Therefore, "composed of a single resin" means, for example, in the case where polyethylene is used as the single material, that the film is composed of at least one material selected from the group consisting of polyethylene, such as HDPE, LDPE, LLDPE, and ULDPE.

[0014] Film materials 51, 52, and 53 may be a single layer (monolayer), or may be configured with multiple layers laminated together. However, even in the case of a multiple layer laminate, each layer is preferably made of a single material, but each layer may be made of a different material within a single material, such as a laminate of HDPE and LLDPE. Film materials 51, 52, and 53 are preferably configured with a laminated structure by heat sealing (no laminated bonding layer is included), but may also be configured with a laminated structure by dry lamination, extrusion lamination, co-extrusion lamination, or the like.

[0015] FIG. 5 shows a state of the film material 50 in which film materials 51 and 52 are laminated and bonded. A non-adhesive region 59 constituting the support portion 7 is formed between the layers of film material 51 and film material 52. The non-adhesive region 59 is provided in the sheet material 5 along the periphery of the portions corresponding to the front portion 3a, the back portion 3b, and the bottom portion 4. The non-adhesive region 59 is formed between the layers of film material 51 and film material 52 by bonding the film materials 51 and 52 along the periphery using a known adhesive or thermal welding to define the shape of the non-adhesive region 59. An opening 54 is formed in the portion of the sheet material 5 corresponding to the upper portion 2, through which the mouth of the spout portion 18 protrudes. A mouth 55 is formed in the portion of the sheet material 5 corresponding to the upper portion 2, through which a filler material, for example, air 60, is introduced into the non-adhesive region 59. The non-adhesive region 59 forms the support portion 7 when filled (enclosed) with the filler material, for example, air 60, through the mouth 55.

[0016] The filler may be a fluid (gas or liquid), a solid (e.g., powder, granular material, resin pellets, etc.), or a semi-solid (e.g., foam material, etc.), but from the viewpoint of reducing the weight of the sheet material container 1, it is preferable to use a gas as the filler. Examples of gases used as a filler include air, nitrogen, oxygen, inert gases (argon, helium, etc.), etc. From the viewpoint of cost, etc., it is preferable to use air.

[0017] The film material 50 and the film material 53 are joined at their peripheries by known joining means such as heat fusion or adhesive.

[0018] In this embodiment, when the sheet material 5 is folded to form the bag-shaped sheet material container 1, the support portions 7 are respectively arranged on the peripheries of the front portion 3a and the back portion 3b of the sheet material container 1 and on the top portion 2 and the bottom portion 4. The support portions 7 include standing portions 7A-7D extending in the height direction in the width direction X of the sheet material container 1, a bottom connecting portion 7E connecting the standing portions 7A and 7B on the bottom portion 4 side of the sheet material container 1, a bottom connecting portion 7F connecting the standing portions 7C and 7D on the bottom portion 4 side, and protruding portions 7K-7N protruding from the standing portions 7A-7D. At the connecting points between the bottom connecting portion 7E and the standing portions 7A and 7B, curved portions 11, 11 are formed that curve from the outside of the container toward the inside of the container. That is, the bottom connecting portion 7E is formed between the pair of curved portions 11, 11. At the connection points between the bottom connecting portion 7F and the standing portions 7C and 7D, curved portions 12, 12 are formed that curve from the outside of the container toward the inside of the container. That is, the bottom connecting portion 7F is formed between a pair of curved portions 12, 12. The curved portions 11, 11 and the curved portions 12, 12 form a lower curved portion.

[0019] The support portion 7 includes an upper connecting portion 7G that connects the upright portion 7A and the upright portion 7B on the upper portion 2 side, and an upper connecting portion 7H that connects the upright portion 7C and the upright portion 7D. At the connection points between the upper connecting portion 7G and the upright portion 7A and the upright portion 7B, curved portions 13, 13 that curve from the outside of the container toward the inside of the container are formed. At the connection points between the upper connecting portion 7H and the upright portion 7C and the upright portion 7D, curved portions 14, 14 that curve from the outside of the container toward the inside of the container are formed. The curved portions 13, 13 and the curved portions 14, 14 form the upper curved portion. Furthermore, the curved portions 11, 11 and the curved portions 12, 12 are connected at the bottom portion 4 by bottom connecting portions 7I, 7J, respectively. That is, the sheet material container 1 has a plurality of surfaces such as a top 2 and a bottom 4, and the curved portions 11 to 14 are formed at a plurality of locations on the sheet material container 1. Moreover, the curved portions 11 to 14 are formed across the plurality of surfaces of the sheet material container 1.

[0020] FIG. 6 shows the state before air is filled as a filler in the non-adhesive region 59 and before the content liquid 61 is contained in the containing section 8 (hereinafter also referred to as the "flat state"), and FIG. 7 shows a cross-sectional view taken along line AA in FIG. 1. 7, in the state where the filler is sealed in the non-adhesive region 59 and the storage section 8 of the sheet material container 1 is filled with the content liquid 61 (hereinafter also referred to as the "expanded state"), the support section 7 has a circular cross-sectional shape when viewed in a direction perpendicular to its axial direction. It is preferable that the support section 7 has a circular cross-sectional shape even before the content liquid 61 is filled. The side surface portions 3c are formed so as to protrude outward beyond the support portions 7 in the front surface 3a and the back surface 3b over the entire area in the height direction Z of the body portion 3. In the present embodiment, the distance L3 in the width direction X of the side surface portions 3c of the sheet material container 1 in the inflated state (hereinafter also referred to as "the distance L3 of the side surface portions 3c") is constant over the entire area in the height direction Z of the body portion 3, but may be different.

[0021] When measuring the shape and dimensions of each part of a sheet material container 1 that is actually used as a packaging container for a product, such as the cross-sectional shape and diameter of the support part 7 filled with a filler material, and the distance L3 of the side part, the measurements are taken in the state of various products in which the sheet material container 1 is filled with the filler material and the content liquid. It should be noted that the cross-sectional shape of the support portion 7 is not limited to a strict circle, but also includes an ellipse that approximates a circle. For example, an ellipse that approximates a circle has a ratio of its major axis to its minor axis that is preferably 2.0 or less, more preferably 1.5 or less, and even more preferably 1.1 or less. The diameter of the ellipse is the equivalent diameter converted into the diameter of a perfect circle with the same cross-sectional area.

[0022] From the viewpoint of improving the self-standing ability and impact resistance of the sheet material container 1, the diameter L1 of the support portion 7 in the inflated sheet material container 1 is preferably 20 mm or more, more preferably 25 mm or more. Also, from the viewpoint of improving the appearance as a product, the diameter L1 of the support portion 7 in the inflated sheet material container 1 is preferably 40 mm or less, more preferably 30 mm or less. Taking the above viewpoints into consideration, the diameter L1 of the support portion 7 in the inflated sheet material container 1 is preferably 20 mm or more and 40 mm or less, more preferably 25 mm or more and 30 mm or less. From the viewpoint of improving the impact resistance of the sheet material container 1, the distance L3 of the side surface portion 3c in the inflated sheet material container 1 is preferably 3 mm or more, more preferably 5 mm or more. Also, from the viewpoint of improving the appearance of the product, the distance L3 of the side surface portion 3c in the inflated sheet material container 1 is preferably 20 mm or less, more preferably 10 mm or less. Taking the above viewpoints into consideration, the distance L3 of the side surface portion 3c in the inflated sheet material container 1 is preferably 3 mm or more and 20 mm or less, more preferably 5 mm or more and 10 mm or less.

[0023] In the inflated state, the outer edge shape of the side surface portion 3c of the sheet material container 1 is non-linear when viewed from the front surface portion 3a (see FIGS. 1 and 2). That is, in the inflated state, the outer edge shape of the upper side surface portion 3c of the sheet material container 1 of this embodiment is substantially arc-shaped, and the outer edge shape of the lower side surface portion 3c is linear when viewed from the front surface portion 3a. More specifically, in the upper region of the sheet material container 1 in the inflated state, which is bisected in the height direction Z, the sheet material container 1 has gently curved bulging portions 20 on both sides in the width direction X, with the joints 6 protruding outward in the width direction X. The bulging portions 20 have a lower narrowing portion 22 in which the length in the width direction X of the sheet material container 1 gradually decreases from the maximum width portion 21 toward the bottom 4, and an upper narrowing portion 23 in which the length in the width direction X of the sheet material container 1 gradually decreases from the maximum width portion 21 toward the top 2. In the sheet material container 1, the portion where the tip of the bulging portion 20 is located in the height direction Z is the widest portion 21 where the length of the sheet material container 1 in the width direction X is the maximum (see FIG. 2). The sheet material container 1 in the inflated state may have a non-linear outer edge shape of the side surface portion 3c when viewed from the front surface portion 3a, for example, a generally arcuate shape with a gentle curvature.

[0024] As a result of various investigations, the present inventors have found that the impact resistance of the side surface portion 3c has a particularly large effect on the impact resistance of a sheet material container. The sheet material container of the present invention has superior impact resistance of the side portions 3c compared to conventional sheet material containers. In other words, conventional sheet material containers have support portions 7 formed to protrude outward from the body 3 when inflated. Therefore, when the sheet material container is dropped onto the floor with the side portions 3c facing downward, the support portions 7 come into contact with the floor first, making the support portions susceptible to breakage. In contrast, according to the sheet material container of the present invention, the side portions 3c of the sheet material container 1 in an inflated state are formed to protrude outward beyond the support portions 7 on the front portion 3a and rear portion 3b over the entire height direction Z when viewed from the front portion 3a side. As a result, when the inflated sheet material container 1 is dropped with the side portions 3c facing downward, the side portions 3c come into contact with the surface first, and the side portions 3c act as cushions to prevent breakage of the support portions 7, resulting in superior impact resistance of the side portions 3c. Furthermore, since the outer edge shape of the side portion 3c of the sheet material container 1 of the present invention when viewed from the front portion 3a side is non-linear, it is possible to disperse the force of the impact of a drop from the side, thereby further improving the impact resistance of the side portion 3c. Thus, the sheet material container 1 of the present invention has excellent impact resistance when dropped onto the floor with the side surface 3c facing downward. That is, the sheet material container 1 of the present invention has excellent impact resistance even when the film material is made of a single synthetic resin, for example.

[0025] From the viewpoint of improving the impact resistance of the sheet material container 1, the ratio (L8 / L7) of the distance L8 from the top 2 to the widthmost part 21 to the height L7 of the container body 10 is preferably 0.1 or more and 0.5 or less, more preferably 0.2 or more and 0.3 or less. This makes it possible to disperse the force of the impact of a drop from the side, thereby further improving the impact resistance of the sheet material container 1.

[0026] From the viewpoint of improving impact resistance, it is preferable that when the side surface portion 3c is grounded with a filler material sealed in the non-adhesive region 59, a gap extending along the support portion 7 is formed between the side surface portion 3c and the ground surface. More specifically, it is preferable that when the side surface portion 3c is grounded with a filler material sealed in the non-adhesive region 59, a gap extending along the height direction Z is formed in the side surface portion 3c between the side surface portion 3c and the ground surface. This makes it possible to disperse the force of the impact when dropped from the side.

[0027] As shown in Figure 7, from the viewpoint of improving impact resistance, the width L5 of the side portion 3c of the sheet material container 1 in an inflated state, i.e., the distance L5 of the side portion 3c in the front-to-rear direction Y (hereinafter also referred to as "distance L5 of the side portion 3c"), is preferably at least 10 mm or more, more preferably at least 15 mm or more. In addition, from the viewpoint of improving the appearance of the product, the distance L5 of the side surface portion 3c of the sheet material container 1 in the inflated state is preferably 30 mm or less, and more preferably 25 mm or less. Taking the above points into consideration, the distance L5 of the side surface portion 3c of the sheet material container 1 in the inflated state is preferably 10 mm or more and 30 mm or less, and more preferably 15 mm or more and 25 mm or less. In addition, it is preferable that the sheet material container 1 satisfies the preferred numerical range of the distance L5 of the side portion 3c at the widest portion 21, it is more preferable that the preferred numerical range of the distance L5 of the side portion 3c is satisfied in the upper region divided into two equal parts in the height direction Z of the container body 10, and it is even more preferable that the preferred numerical range of the distance L5 of the side portion 3c is satisfied throughout the entire height direction of the container body 10. Furthermore, the distance L5 of the side surface portion 3c does not have to be constant throughout the height direction Z of the container body 10. For example, from the viewpoint of self-supporting property, the distance L5 of the side surface portion 3c may be wide near the bottom 4 and narrow as it approaches the top 2.

[0028] In the sheet material container 1, the distance L6 in the width direction X of the joint 6 (hereinafter also referred to as "distance L6 of the joint 6") is preferably at least 1 mm or more, more preferably at least 3 mm or more, from the viewpoint of improving impact resistance. From the viewpoint of improving the gripping ability (side gripping) of the container, the distance L6 of the joint 6 in the sheet material container 1 is preferably 10 mm or less, and more preferably 5 mm or less. Taking the above points into consideration, in the sheet material container 1, the distance L6 of the joint portion 6 is preferably 1 mm or more and 10 mm or less, and more preferably 3 mm or more and 5 mm or less.

[0029] In the sheet material container 1, it is preferable that the internal pressure of the support portion 7 is 40 KPa or more when the filler is filled in the non-adhesive region 59. This can improve the self-supporting ability of the sheet material container and the shape stability of the container. From the viewpoint of improving the self-standing ability and shape retention of the container, the internal pressure of the support part 7 is preferably 40 KPa or more, and more preferably 60 KPa or more. From the viewpoint of durability of the support part 7, the internal pressure of the support part 7 is preferably 100 KPa or less, and more preferably 80 KPa or less. Taking the above points into consideration, the internal pressure of the support part 7 is preferably 40 KPa or more and 100 KPa or less, and more preferably 60 KPa or more and 80 KPa or less.

[0030] Next, preferred configurations and the like of each of the above-mentioned embodiments will be described in detail. Note that it is preferable that the sheet material container 1 satisfies the following ratio at the maximum width portion 21, more preferably at an upper region divided into two equal parts in the height direction Z of the container body 10, and even more preferably at the entire height direction of the container body 10. From the viewpoint of improving impact resistance, in an inflated sheet material container 1, the ratio (L4 / L1) of the diameter L1 of the distance L4 between the film materials 51 to the diameter L1 of the support portion 7 is preferably 2 or more and 8 or less, more preferably 2 or more and 4 or less.

[0031] From the viewpoint of improving impact resistance, in an inflated sheet material container 1, the ratio (L2 / L4) of the distance L2 between the support portions 7 to the distance L4 between the film materials 51 is preferably 0.3 or more and 0.9 or less, more preferably 0.5 or more and 0.8 or less. From the viewpoint of improving impact resistance, in an inflated sheet material container 1, the ratio (L3 / L9) of the distance L3 of the side portion 3c to the distance L9 in the width direction X of the sheet material container 1 is preferably 0.1 or more and 0.5 or less, more preferably 0.2 or more and 0.3 or less. From the viewpoint of improving impact resistance, the distance L4 between the film materials 51 relative to the distance L9 in the width direction X of the sheet material container 1 (L4 / L9) is preferably 0.2 to 0.7, more preferably 0.3 to 0.6.

[0032] The sheet material container 1 having the above-described configuration is carried into, for example, a product manufacturing factory before the filler is sealed in the support portion 7. This allows the sheet material container 1 to be efficiently carried in while reducing the transport volume. At the product manufacturing factory, the product can be easily manufactured by a manufacturing method including a step of storing the content liquid in the storage portion 8 of the sheet material container 1 and a step of sealing the filler in the non-adhesive region to form the support portion 7.

[0033] The sheet material container of the present invention is not limited to the embodiment shown in Figures 1 to 7 described above. Another embodiment of the sheet material container according to the present invention will be described below. In the following, the components of the other embodiment that are different from the embodiment shown in Figures 1 to 7 will be mainly described, and similar components will be given the same reference numerals and will not be described again. For components that are not particularly described, the description of the embodiment shown in Figures 1 to 7 will be applied as appropriate.

[0034] Although the sheet material container 1 described above has a three-layer structure, the present invention is not limited to this structure. For example, it may be made of two layers of film material, as in the sheet material container shown in Fig. 8. In this sheet material container, when inflated, the side surface portions 3c protrude outward beyond the support portions in the front surface portion 3a and the rear surface portion 3b over the entire height direction, and the outer edge shape of the side surface portions 3c when viewed from the front surface portion 3a side is non-linear, so that the sheet material container has excellent impact resistance.

[0035] The present invention is not limited to the above-described embodiments and can be modified as appropriate. The above-described embodiments may also be combined. For example, in each of the above embodiments, printing (printing) may be performed on the outer surface of the sheet material container 1. The printed surface may be the back side or the front side of the sheet material container 1. The printed image may display, for example, letters, figures, symbols, colors, or a combination thereof, and the number of colors is not limited. In addition, the film materials 51, 52, and 53 may contain one or more of fillers, release agents, flame retardants, conductive agents, antistatic agents, pigments, antioxidants, impact modifiers, stabilizers, wetting agents, dyes, etc., either alone or in combination.

[0036] Furthermore, the thickness of the film materials 51, 52, and 53 is not particularly limited, and can be adjusted according to the properties required for the sheet material container 1, such as rigidity, pinhole resistance, and impact resistance.

[0037] Furthermore, the layers of film material constituting the sheet material 5 do not necessarily need to be bonded together by a lamination method using a laminating adhesive, but may be bonded together by other known methods. For example, bonding methods using other adhesives such as UV-curable adhesives and instant adhesives can also be used. [Example]

[0038] The present invention will be described in more detail below using examples, but the scope of the present invention is not limited to these examples.

[0039] Example 1 A sheet material container 1 was manufactured having the same structure as the embodiment shown in Fig. 1. First, film materials 51, 52 and 53 were prepared. The sheet material container 1 was manufactured by laminating the unfolded film material 51 with the unfolded film material 52 and film material 53 in this order, folding the film materials 51, 52, and 53, and heat-sealing the peripheries of each of the film materials 51, 52, and 53. The content liquid was then contained in the storage section 8, and a filler material was sealed in the non-adhesive region 59 to form the support section 7. A co-extruded film (PET / Ny) was used as the film material 51, a PE film as the film material 52, and a co-extruded film (PET / Ny) as the film material 53. Air was used as the filler, and water was used as the content liquid. The thickness of the film material 51 was 80 μm, the thickness of the film material 52 was 40 μm, and the thickness of the film material 53 was 120 μm. In the sheet material container of Example 1, the internal pressure of the support portion 7 was 20 KPa and the internal pressure of the storage portion 8 was 60 KPa in the inflated state. The diameter L1 (mm) of the support portion, the distance L2 (mm) between the support portions, the distance L3 (mm) of the side portions 3c, the distance L4 (mm) between the film materials 51, the distance L5 (mm) of the side portions 3c, the distance L6 (mm) of the joint portion 6, the height L7 (mm) of the container body 10, the distance L8 (mm) from the top 2 to the widest portion 21, and the internal pressure (KPa) of the support portion are as shown in Table 1. In addition, in the sheet material container of Example 1, the side portion 3c protrudes outward beyond the support portion throughout the entire height direction Z, and the outer edge shape of the side portion 3c when viewed from the front portion 3a side is non-linear (approximately arc-shaped with a gentle curvature).

[0040] Example 2 A sheet material container was produced in the same manner as in Example 1, except that the internal pressure of the support part 7 was set as shown in Table 1. In the sheet material container of Example 2, the side portion 3c protrudes outward beyond the support portion throughout the height direction Z, and the outer edge shape of the side portion 3c when viewed from the front portion 3a side is non-linear (the upper portion is approximately arc-shaped and the lower portion is linear) as shown in Figure 1.

[0041] Example 3 A sheet material container was produced in the same manner as in Example 1, except that the diameter L1 of the support portion 7 was set as shown in Table 1. In the sheet material container of Example 3, the side portion 3c protruded outward beyond the support portion throughout the entire height direction Z, and the outer edge shape of the side portion 3c when viewed from the front portion 3a side was non-linear (approximately arc-shaped with a gentle curvature).

[0042] Example 4 A sheet material container was produced in the same manner as in Example 1, except that the internal pressure of the support part 7 was set as shown in Table 1. In the sheet material container of Example 4, the side portion 3c protruded outward beyond the support portion throughout the height direction Z, and the outer edge shape of the side portion 3c when viewed from the front portion 3a side was non-linear (approximately arc-shaped with a gentle curvature).

[0043] Comparative Examples 1 and 2 Comparative Examples 1 and 2 were manufactured in the same manner as Example 1, except that the side portions 3c protruded outward beyond the support portions throughout the height direction Z of the sheet material container, the outer edge shape of the side portions 3c when viewed from the front portion 3a side was linear, and the diameter L1 (mm) of the support portions, the distance L2 (mm) between the support portions, the distance L3 (mm) of the side portions 3c, the distance L4 (mm) between the film materials 51, the distance L5 (mm) of the side portions 3c, the distance L6 (mm) of the joint portion 6, the height L7 (mm) of the container body 10, the distance L8 (mm) from the top 2 to the widest portion 21, and the internal pressure (KPa) of the support portions were set to the values shown in Table 1.

[0044] Comparative Example 3 Comparative Example 3 was manufactured in the same manner as Example 1, except that the side portions 3c protrude outward beyond the support portions throughout the height direction Z of the sheet material container, the outer edge shape of the side portions 3c when viewed from the front portion 3a side is non-linear (approximately arc-shaped with a gentle curvature), and the diameter L1 (mm) of the support portions, the distance L2 (mm) between the support portions, the distance L3 (mm) of the side portions 3c, the distance L4 (mm) between the film materials 51, the distance L5 (mm) of the side portions 3c, the distance L6 (mm) of the joint portion 6, the height L7 (mm) of the container body 10, the distance L8 (mm) from the top 2 to the widest portion 21, and the internal pressure (KPa) of the support portions were set to the values shown in Table 1.

[0045] [Sample 1] Sample 1 was manufactured in the same manner as Example 1, except that the side portions 3c protrude outward beyond the support portions throughout the height direction Z of the sheet material container, the outer edge shape of the side portions 3c when viewed from the front portion 3a side is linear, and the diameter L1 (mm) of the support portions, the distance L2 (mm) between the support portions, the distance L3 (mm) of the side portions 3c, the distance L4 (mm) between the film materials 51, the distance L5 (mm) of the side portions 3c, the distance L6 (mm) of the joint portion 6, the height L7 (mm) of the container body 10, the distance L8 (mm) from the top 2 to the widest portion 21, and the internal pressure (KPa) of the support portions were set to the values shown in Table 1.

[0046] [Table 1]

[0047] The sheet material containers obtained in Examples, Comparative Examples, and Sample 1 were subjected to measurement of drop impact value and evaluation of drop strength by the following methods. The results are shown in Tables 2 and 3. In Tables 1, 2, and 3, "-" indicates that no measurement or evaluation was performed.

[0048] [Measurement of drop impact value] An experiment was conducted at room temperature by sealing 60 g of liquid in the sheet material container obtained in Sample 1. Next, a strain gauge (product name: GFLAB-3LJC-F, manufactured by Tokyo Measuring Instruments Co., Ltd.) was attached to the lower end of the side surface portion 3c of the sheet material container using a known joining means, for example, an adhesive, and the lead wires of the strain gauge were connected to a strain amplifier (product name: NR-ST04, manufactured by Keyence Corporation) which was connected to a data logger (product name: NR-600, manufactured by Keyence Corporation). Then, the sheet material container with the attached strain gauge was dropped from a height of 1 m onto a steel plate with the top portion 2, front surface portion 3a or rear surface portion 3b, side surface portion 3c, bottom surface 4, and the end portions of the bottom surface 4 in the width direction X facing downward, and the drop impact value (MPa) and application time (mmSec) were measured. Three containers were prepared for each evaluation, and the drop was performed three times. The arithmetic mean of the maximum drop impact values obtained was calculated and used as the drop impact value (MPa) for the top 2, the front part 3a or the back part 3b, the side part 3c, the bottom 4, and the end part in the width direction X of the bottom 4. In Table 1, "drop position" refers to the part that first comes into contact with the steel plate when the sheet material container is dropped.

[0049] [Evaluation of drop strength] Each of the sheet material containers of Examples 1 to 4 and Comparative Examples 1 and 2 was filled with 60 g of liquid and stored in an environment at 20°C for 24 hours. After that, the container was dropped three times onto a steel plate in a horizontal position so that the side surface 3c touched the floor. The appearance of the sheet material container was visually inspected and the drop strength was evaluated according to the following criteria. Five containers were prepared for each type of evaluation. Example 1 and Comparative Example 1 were dropped from a height of 1 m. Examples 2 to 4 and Comparative Example 2 were dropped from heights of 1 m and 1.2 m. ⊚: All containers were free of damage and had good appearance. ○: No damage, but deterioration of the seal was observed on the container. △: No damage, but some containers were found to have peeling of the seal. ×: Damaged or nearly damaged containers were found.

[0050] [Table 2]

[0051] [Table 3]

[0052] As is clear from the results shown in Table 2, in the measurement of the drop impact value of Sample 1, the drop impact value was highest when the side portion 3c was dropped facing downwards, which shows that the side portion 3c is the part that particularly affects the impact resistance of the sheet material container. Furthermore, as is clear from the results shown in Table 3, the sheet material containers obtained in Examples 1 to 4 have excellent impact resistance because the diameter of the support portion 7 is 20 mm or more and the outer edge shape of the side portion 3c is non-linear.

[0053] Furthermore, the same effect was obtained when PE films were used as the film materials 51, 52, and 53. Therefore, when a film material made of a single synthetic resin is used, it is possible to improve recyclability and impact resistance. [Explanation of symbols]

[0054] 1 Sheet material container 2. Top 3. Torso 3a Front section 3b Back part 3c Side part 4 Bottom 5 Sheet material 6 Joint 7 Support part 7A,7B,7C,7D Standing section 7E,7F,7I,7J Bottom connection part 7G,7H Upper connection part 8 Storage section 11, 12, 13, 14 Curved section 18 Spout 20 Bulge 21 Maximum width part 22 Lower width reduction part 23 Upper width reduction part 50, 51, 52, 53 Film material X Width direction Y Front-to-rear direction

Claims

1. The container is formed of a sheet material in which a plurality of film materials are laminated, and has a body portion having a front portion, a back portion facing the front portion, and a side portion interposed between the front portion and the back portion, and a bottom portion located at the lower end of the body portion, A sheet material container in which a support portion is formed by sealing a filler in a non-adhesive region formed between the plurality of film material layers, the non-adhesive regions are provided along the peripheries of the front portion, the back portion, and the bottom portion; When a filler material is sealed in the non-adhesive region and the sheet material container is filled with a liquid content, the support portion has a circular cross-sectional shape in a direction perpendicular to its axial direction and a diameter of 20 mm or more, and over the entire height direction of the body, the side portion protrudes outward beyond the support portion in the front and back portions when viewed from the front portion side, and the outer edge shape of the side portion when viewed from the front portion side is non-linear.

2. 2. The sheet material container according to claim 1, wherein when the side portion is grounded with a filler material sealed in the non-adhesive region, a gap extending along the support portion is formed between the side portion and the ground surface.

3. 2. The sheet material container according to claim 1, wherein the width of the side surface along the front-rear direction is at least 15 mm when the non-adhesive region is filled with a filler and the sheet material container is filled with a liquid.

4. The side surface portion has a joining portion formed thereon for joining the film materials together, 2. The sheet material container according to claim 1, wherein the width of the joint is at least 3 mm or more.

5. 2. The sheet material container according to claim 1, wherein the internal pressure of the support portion is 40 KPa or more.

6. 6. The sheet material container according to claim 1, wherein the plurality of film materials are all made of a single synthetic resin.

Images