Multilayer bags and packaged bags

Abstract

In a multi-layered bag after use, this facilitates the separation of the innermost tubular layer that was in contact with the contents from the tubular layers of the other layers. [Solution] The multi-layered bag has a cylindrical body 2 having an opening 2a at one end and a sealing part 3 at the other end. The body 2 is made up of multiple layers of cylindrical bodies overlapping from the inside to the outside. The sealing part 3 includes a sewing part 3A that sews the multiple layers of cylindrical bodies together. Contents 12 that are visible from the outside and whose orientation allows for identification of top and bottom are written on the body 2 such that the top side of the contents 12 is on the side of the sealing part 3 and the bottom side of the contents 12 is on the side of the opening 2a.

Description

Technical Field

[0001] The present invention relates to a multilayer bag and a bagged product using the same.

Background Art

[0002] In paragraph

[0003] ~

[0011] of Patent Document 1 below, there is disclosed a multilayer bag having a cylindrical body portion with an opening at one end and sealed at the other end with a sealing portion, wherein the body portion is composed of a plurality of cylindrical bodies overlapping from the inside to the outside, the inner surfaces of the innermost cylindrical body among the plurality of cylindrical bodies are heat-sealable, and the sealing portion includes a sewing portion for sewing the plurality of cylindrical bodies and a heat-sealing portion where the inner surfaces of the innermost cylindrical body are heat-sealed. In this conventional multilayer bag, in use, a desired content is accommodated inside the innermost cylindrical body through the opening, and the opening is sealed by the heat-sealing portion formed by the inner surfaces of the innermost cylindrical body to form a bagged product.

[0003] In such a conventional multilayer bag, on the body portion, there is described content that can be visually recognized from the outside and can distinguish between top and bottom (for example, letters, illustrations, figures, pictures indicating product names, types / quantities / handling methods of contents, manufacturers, catchphrases, promotions, etc.) by printing or the like. The described content is described on the body portion such that the top side of the described content (for example, the upper side of the letters or the top side of the mountain picture) is on the side of the opening and the bottom side of the described content (for example, the lower side of the letters or the foot of the mountain picture) is on the side of the sealing portion.

[0004] Furthermore, in the conventional bagged product using the conventional multi-layered bag, when the contents were to be removed from the multi-layered bag for use, an opening was made in the body of the bag by cutting the top of the bag with scissors or another bladed tool, and the contents were removed from there. The reason for cutting the top of the bag is that when the contents have been partially used and some of the contents remain inside the multi-layered bag, the side with the opening created by the cut will be placed with the top of the bag facing vertically upwards, and in that case, it is very natural for the top of the bag to be facing vertically upwards. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Utility Model Registration No. 3156541 Gazette [Overview of the project] [Problems that the invention aims to solve]

[0006] However, with the conventional multi-layered bags and the conventional bagged products using them, it was difficult to separate the innermost tubular body that had been in contact with the contents from the tubular bodies of the other layers in the multi-layered bag that remained after the contents had been removed and used. In other words, even in the multi-layered bag after use, the innermost tubular body and the tubular bodies of the other layers remained sewn together at the stitching, and this stitching acted as an obstacle, making it difficult to separate the innermost tubular body that had been in contact with the contents from the tubular bodies of the other layers. For this reason, with the conventional multi-layered bags and the conventional bagged products using them, it was difficult to separate the innermost tubular body from the tubular bodies of the other layers after use, and to recycle the tubular bodies of the layers other than the innermost layer.

[0007] The present invention has been made in view of these circumstances, and aims to provide a multilayer bag, and a bagged product using the same, in which, despite using a machine-stitched portion for sealing one of the body sections, the innermost tubular body that was in contact with the contents and the tubular bodies of the other layers can be easily separated after use. [Means for solving the problem]

[0008] To solve the aforementioned problems, the following embodiments are presented. The first embodiment is a multilayer bag having a cylindrical body having an opening at one end and a sealing portion at the other end, wherein the body is composed of multiple layers of cylindrical bodies overlapping from the inside to the outside, the sealing portion includes a sewing portion for sewing the multiple layers of cylindrical bodies together, and the body is inscribed with information that is visible from the outside and whose orientation allows for identification of top and bottom, such that the top side of the information faces the sealing portion and the bottom side of the information faces the opening.

[0009] In this first embodiment of the multi-layered bag, when in use, the desired contents are placed inside the innermost tubular layer of the multiple tubular layers through the opening, and the opening is then sealed to form a bag. At this time, the sealing of the opening is performed by a means that makes it easier to separate the innermost tubular layer from the tubular layers of the other layers than by sewing.

[0010] Furthermore, in the bagged body using the multilayer bag according to the first embodiment, as with the conventional bagged body, when the contents are to be removed from the multilayer bag for use, an opening is made in the body by cutting the top side of the written contents with scissors or other bladed tool, and the contents are removed from there. At this time, in the multilayer bag according to the first embodiment, the top and bottom of the written contents on the body are reversed compared to the conventional multilayer bag, and the top side of the written contents is the side of the machine-stitched portion, so the machine-stitched portion is cut off.

[0011] Therefore, according to the first embodiment, even though a machine-stitched portion is used for sealing one of the body sections, it is possible to provide a multi-layer bag in which the innermost tubular body that was in contact with the contents and the tubular bodies of the other layers can be easily separated after use.

[0012] The second embodiment of the multilayer bag is characterized in that, in the first embodiment, a guide visible from the outside is provided on the side of the sealing portion of the body, indicating a cutting position for cutting off the sealing portion of the body to open the side of the sealing portion of the body.

[0013] According to this second embodiment, the guide is provided and the cutting position is clearly indicated, making it more user-friendly.

[0014] A multilayer bag according to a third embodiment is a multilayer bag having a cylindrical body having an opening at one end and a sealing portion at the other end, wherein the body is composed of multiple layers of cylindrical bodies overlapping from the inside to the outside, the sealing portion includes a sewing portion for sewing the multiple layers of cylindrical bodies together, and a guide visible from the outside, indicating a cutting position for cutting off the sealing portion of the body to open the side of the body where the sealing portion is located, is written on the side of the sealing portion of the body. In this third embodiment, the orientation of the contents written on the body is not particularly limited.

[0015] In this third embodiment of the multi-layered bag, when in use, the desired contents are placed inside the innermost tubular layer of the multiple tubular layers through the opening, and the opening is then sealed to form a bag. At this time, the sealing of the opening is performed by a means that makes it easier to separate the innermost tubular layer from the tubular layers of the other layers than by sewing.

[0016] Furthermore, in the bagged body using the multilayer bag according to the third embodiment, as with the conventional bagged body, when the contents are to be removed from the multilayer bag for use, an opening is made in the body by cutting at the cutting position indicated by the guide with scissors or other bladed tool, and the contents are removed from there. At this time, in the multilayer bag according to the third embodiment, since the guide indicates the cutting position, the machine-stitched portion is cut off.

[0017] Therefore, according to the third embodiment, even though a machine-stitched portion is used for sealing one of the body sections, it is possible to provide a multi-layer bag in which the innermost tubular body that was in contact with the contents and the tubular bodies of the other layers can be easily separated after use.

[0018] In the fourth embodiment, the multilayer bag is such that, in any of the first to third embodiments, the inner surfaces of the innermost tubular bodies among the multiple layers of tubular bodies are heat-sealable, and the sealing portion includes a heat-sealed portion formed by the heat sealing of the innermost tubular bodies. However, in the first to third embodiments, the sealing portion may include, for example, an adhesive portion instead of a heat-sealed portion.

[0019] This fourth embodiment provides an example in which the innermost cylindrical bodies in the sealing portion are joined together by a heat seal portion.

[0020] In the fifth embodiment of the multilayer bag, the sewing portion is positioned on the side of the opening relative to the heat-seal portion, as in the fourth embodiment.

[0021] According to this fifth aspect, since the sewing part of the sewing machine is arranged on the side of the opening with respect to the heat-sealing part, in the bagged body using the multilayer bag according to the fifth aspect, air or the like inside the innermost cylindrical body can be degassed through the stitches of the sewing part of the sewing machine. Therefore, even if a plurality of bagged bodies using the multilayer bag according to the fifth aspect are stacked, the stacking stability can be enhanced, and the expansion of residual air generated in highlands or the like can be avoided. And since a sewing thread is inserted into the stitches of the sewing part of the sewing machine, the possibility of the contents spilling out from there is reduced.

[0022] The multilayer bag according to the sixth aspect is, in the fourth aspect, such that the heat-sealing part is arranged on the side of the opening with respect to the sewing part of the sewing machine.

[0023] According to this sixth aspect, since the heat-sealing part is arranged on the side of the opening with respect to the sewing part of the sewing machine, in the bagged body using the multilayer bag according to the fifth aspect, the sealing property inside the innermost cylindrical body can be enhanced, which is suitable for containing contents that dislike ventilation with the outside world, moisture, or contents that emit a bad smell.

[0024] The multilayer bag according to the seventh aspect is, in any one of the first to sixth aspects, such that between the innermost cylindrical body among the plurality of cylindrical bodies and the cylindrical body of the layer adjacent to and overlapping the innermost cylindrical body among the plurality of cylindrical bodies, they are adhesively bonded in a dot pattern with an adhesive at a plurality of locations on the side of the opening.

[0025] According to this seventh aspect, also on the side of the opening, it is possible to fix the space between the innermost layer among the plurality of cylindrical bodies and the cylindrical body of the layer adjacent to and overlapping the innermost cylindrical body among the plurality of cylindrical bodies. Moreover, since the adhesion between them is a dot pattern adhesion, the adhesive force can be made relatively low. Therefore, after use, it is possible to more easily separate the innermost cylindrical body from the cylindrical bodies of the other layers.

[0026] The multilayer bag according to the eighth aspect is, in the seventh aspect, wherein the plurality of layers are three or more layers, and the cylindrical bodies of the layers other than the innermost layer among the plurality of cylindrical bodies of the plurality of layers, the cylindrical bodies of the layers that are adjacent to and overlap each other are adhered with an adhesive at a plurality of locations on the side of the opening.

[0027] According to this eighth aspect, even on the side of the opening, it is possible to fix the cylindrical bodies of the layers other than the innermost layer among the plurality of cylindrical bodies of the plurality of layers, the cylindrical bodies of the layers that are adjacent to and overlap each other. In the first to seventh aspects, the plurality of layers may be two or more layers.

[0028] The multilayer bag according to the ninth aspect is, in the eighth aspect, the strength of the adhesion by the adhesive between the cylindrical body of the innermost layer among the plurality of cylindrical bodies of the plurality of layers and the cylindrical body of the layer that is adjacent to and overlaps the cylindrical body of the innermost layer is lower than the strength of the adhesion by the adhesive between the cylindrical bodies of the layers other than the innermost layer among the plurality of cylindrical bodies of the plurality of layers, the cylindrical bodies of the layers that are adjacent to and overlap each other.

[0029] According to this ninth aspect, after use, it is possible to more easily separate the cylindrical body of the innermost layer and the cylindrical bodies of the other layers.

[0030] The multilayer bag according to the tenth aspect is, in any of the first to ninth aspects, provided with an over-tape adhered so as to straddle the front and back of the sealing portion and sandwich the front and back.

[0031] According to this tenth aspect, since the over-tape is provided, reinforcement is possible. Also, when directly or indirectly citing the fifth aspect in this tenth aspect, if an over-tape having a desired air permeability is used as the over-tape, it is possible to adjust the amount of degassing of air or the like inside the cylindrical body of the innermost layer, and it is possible to further reduce the possibility of the contents spilling out. However, in the first to ninth aspects, the over-tape may not be provided.

[0032] In the eleventh embodiment of the multilayer bag, in any of the first to tenth embodiments, the tubular bodies of the layers other than the innermost layer of the multiple layers are made of kraft paper or other paper.

[0033] This eleventh embodiment provides an example of the material of the tubular body in layers other than the innermost layer. However, in the first to tenth embodiments, the material of the tubular body in layers other than the innermost layer is not limited to paper.

[0034] The multi-layered bags according to the first to eleventh embodiments described above can be used, for example, as so-called heavy bags for containing relatively heavy powders or granules such as pesticides, fertilizers, chemicals, or animal feed.

[0035] The bagged body according to the twelfth embodiment uses a multi-layered bag according to any of the first to eleventh embodiments, the desired contents are contained inside the innermost tubular body, the opening is sealed with a second sealing portion, the second sealing portion does not include a machine-stitched portion.

[0036] In this twelfth embodiment of the bagged body, since a multi-layered bag according to any of the first to eleventh embodiments is used, even though a machine-stitched portion is used for sealing one of the body sections, the innermost tubular body that was in contact with the contents and the tubular bodies of the other layers can be easily separated after use.

[0037] The bagged body according to the 13th embodiment, in the 12th embodiment (however, limited to those that directly or indirectly refer to the 4th embodiment), the second sealing portion includes a heat-sealed portion formed by the inner surfaces of the innermost cylindrical body.

[0038] According to this 13th embodiment, the airtightness inside the innermost cylindrical body can be improved, making it suitable for storing contents that are sensitive to outside air and moisture, or contents that emit foul odors.

[0039] The fourteenth embodiment of the bagged body is provided with an overtape that is adhered across the front and back of the second sealing portion, sandwiching and covering both sides, as in the twelfth or thirteenth embodiment.

[0040] According to this 14th embodiment, reinforcement is possible because the overtape is provided. However, in the 12th embodiment, the overtape does not need to be provided. [Effects of the Invention]

[0041] According to the present invention, even though a machine-stitched portion is used for sealing one of the body sections, it is possible to provide a multi-layered bag in which the innermost tubular body that was in contact with the contents and the tubular bodies of the other layers can be easily separated after use, as well as a bagged product using the same. [Brief explanation of the drawing]

[0042] [Figure 1] This is a schematic front view illustrating the flattened state of a multilayer bag according to the first embodiment of the present invention. [Figure 2] Figure 1 is a schematic perspective view showing the multi-layered bag with its opening opened. [Figure 3] This is a schematic cross-sectional view along the line A-A' in Figure 2. [Figure 4] This is a schematic cross-sectional view along the line B-B' in Figure 2. [Figure 5] Figure 1 is a schematic front view showing a bagged product using a multi-layered bag. [Figure 6] This is a schematic cross-sectional view along the line C-C' in Figure 5. [Figure 7] Figure 5 is a schematic front view showing the bagged body with the sewing machine stitching side facing upwards in the vertical direction. [Figure 8] This is a schematic front view illustrating a bagged product shown in Figure 7, after it has been cut according to the guide indicating the cutting position, removing one of the seals, and the contents have been removed. [Figure 9] This is a schematic cross-sectional view along the line D-D' in Figure 8. [Figure 10] This is a schematic cross-sectional view illustrating the process of separating the innermost cylindrical body from the cylindrical bodies of the other layers, starting from the state shown in Figure 9. [Figure 11] This is a schematic front view illustrating the flattened state of a multilayer bag according to the second embodiment of the present invention. [Modes for carrying out the invention]

[0043] The multilayer bag and the bagged body using the present invention will be described below with reference to the drawings.

[0044] [First Embodiment]

[0045] Figure 1 is a schematic front view showing the flattened state of the multilayer bag 1 according to the first embodiment of the present invention. Figure 2 is a schematic perspective view showing the multilayer bag 1 shown in Figure 1 with the opening 2a opened. Figure 3 is a schematic cross-sectional view along the line A-A' in Figure 2. Figure 4 is a schematic cross-sectional view along the line B-B' in Figure 2.

[0046] For the sake of explanation, we define the X, Y, and Z axes as mutually orthogonal, as shown in Figures 1 to 4. Within the X-axis direction, the direction indicated by the arrow is sometimes called the +X direction or +X side, and the opposite direction is called the -X direction or -X side. The same applies to the Y and Z axes. These points also apply to the figures described later.

[0047] The multi-layered bag 1 according to this embodiment can be used as a so-called heavy-duty bag for storing contents such as pesticides, fertilizers, or relatively heavy powders or granules.

[0048] The multilayer bag 1 according to this embodiment has a cylindrical body 2 having an opening 2a at one end (the +Y side end) and the other end (the -Y side end) sealed with a sealing portion 3. The body 2 is composed of multiple layers (three layers in this embodiment, but two or more layers are acceptable in the present invention) of cylindrical bodies 2A, 2B, and 2C, which are stacked in that order from the inside to the outside.

[0049] The sealing section 3 includes a sewing section 3A for sewing together multiple layers of tubular bodies 2A, 2B, and 2C. In this embodiment, the inner surfaces of the innermost tubular body 2A among the multiple layers of tubular bodies 2A, 2B, and 2C are heat-sealable, and the sealing section 3 also includes a heat-sealed section 3B where the inner surfaces of the innermost tubular body 2A are heat-sealed together. In this embodiment, the sewing section 3A is positioned on the side of the opening 2a (+Y side) relative to the heat-sealed section 3B.

[0050] In this embodiment, the innermost tubular body 2A is constructed by joining a rectangular sheet having heat-sealable properties on one side with a strip-shaped heat-seal portion 2Aa extending in the Y-axis direction, as shown in Figure 4. However, the present invention is not limited to this, and the tubular body 2A may also be constructed in a tubular shape by, for example, sealing the sheet with adhesive, or, if the sheet is a resin sheet such as polyethylene film, it may be constructed in a tubular shape by inflation molding.

[0051] As the sheets constituting the cylindrical body 2A, for example, a four-layer sheet made of polyethylene / aluminum / polyethylene / unbleached kraft paper laminated in order from one side, or a two-layer sheet made of polyethylene / unbleached kraft paper laminated in order from one side, can be used. However, in the present invention, the material of the cylindrical body 2A is not limited to the examples described above and can be changed as appropriate depending on the contents. For example, the material of the cylindrical body 2A may be a laminate of multiple materials, a single material, or may be paper, petrochemical-derived film, biomass film, biodegradable film, aluminum foil, etc.

[0052] In this embodiment, the tubular bodies 2B and 2C of the layers other than the innermost layer are constructed by sealing each rectangular sheet with adhesive (including starch paste, chemical paste, hot melt adhesive, etc.) 4 and 5 in a strip-shaped region extending in the Y-axis direction, as shown in Figure 4. For example, kraft paper or other types of paper can be used as the sheets constituting the tubular bodies 2B and 2C. However, in this invention, the material of the tubular bodies 2B and 2C is not limited to this example.

[0053] In this embodiment, an overtape 7 is provided, which is attached with an adhesive (including starch paste, chemical paste, or hot melt adhesive) 6 so as to span across the front and back of the sealing portion 3 and cover both sides. Kraft paper is used as the overtape 7, but it is not limited to this. Also, in this invention, the overtape 7 may not be provided.

[0054] Furthermore, in this embodiment, the innermost cylindrical body 2A of the multiple layers of cylindrical bodies 2A, 2B, 2C and the cylindrical body 2B of the layer of cylindrical bodies 2A, 2B, 2C that overlaps adjacent to the innermost cylindrical body 2A are bonded in a dotted manner with adhesive (including starch paste, chemical paste, hot melt adhesive, etc.) 8 at multiple locations on the side of the opening 2a (+Y side).

[0055] Furthermore, in this embodiment, the cylindrical bodies 2B and 2C of the multiple layers of cylindrical bodies 2A, 2B, and 2C, excluding the innermost layer, that are adjacent to each other and overlap, are bonded in a dotted manner with adhesive (including starch paste, chemical paste, hot melt adhesive, etc.) 9 at multiple locations on the side of the opening 2a (+Y side). Bonding with adhesive 8 is preferably done in a dotted manner, but bonding with adhesive 9 may be done in a linear manner or the like.

[0056] Furthermore, in this embodiment, the adhesive strength of the adhesive 8 between the innermost cylindrical body 2A of the multiple layers of cylindrical bodies 2A, 2B, 2C and the cylindrical body 2B of the layer adjacent to and overlapping with the innermost cylindrical body 2A of the multiple layers of cylindrical bodies 2A, 2B, 2C is lower than the adhesive strength of the adhesive 9 between the cylindrical bodies 2B, 2C of the layers other than the innermost layer of the multiple layers of cylindrical bodies 2A, 2B, 2C that are adjacent to and overlapping with each other. In this embodiment, this difference in adhesive strength is achieved by making the bonding area of ​​adhesive 8 smaller than the bonding area of ​​adhesive 9. However, for example, this difference in adhesive strength may also be achieved by making the bonding areas of both the adhesive and adhesive 8 and adhesive 9 different in type and properties.

[0057] Furthermore, in this embodiment, the cylindrical bodies 2A and 2B are bonded together at multiple points on the -Y side with adhesive (including starch paste, chemical paste, hot melt adhesive, etc.) 10 in a dotted manner, and the cylindrical bodies 2B and 2C are bonded together at multiple points on the -Y side with adhesive (including starch paste, chemical paste, hot melt adhesive, etc.) 11 in a dotted manner.

[0058] Furthermore, the only adhesive points between the cylindrical bodies 2A and 2B are those where adhesives 8 and 10 were used, as described above.

[0059] In this embodiment, the contents 12, which are visible from the outside and whose orientation allows for identification of top and bottom, are printed or otherwise inscribed on the body 2 such that the top side of the contents 12 is the side of the sealing portion 3 (-Y side) and the bottom side of the contents 12 is the side of the opening 2a (+Y side). Specifically, in this embodiment, the contents 12 consist of the characters "Iroha" 12A and a mountain illustration 12B. As shown in Figures 1 and 2, the upper side of the characters 12A and the mountaintop side of the illustration 12B are the top side of the contents 12 and are the -Y side, while the lower side of the characters 12A and the foot of the mountain side of the illustration 12B are the bottom side of the contents 12 and are the +Y side. In practice, the contents 12 may be, for example, characters, illustrations, figures, or pictures indicating the product name, type, quantity, and handling instructions of the contents, manufacturer, catchphrase, or promotional information.

[0060] Furthermore, in this embodiment, a guide 13 visible from the outside, which indicates a cutting position for cutting off the sealing portion 3 of the body portion 2 to open the side of the body portion 2 with the sealing portion 3 (-Y side), is printed or otherwise indicated on the side of the body portion 2 with the sealing portion 3 (-Y side). Specifically, in this embodiment, the guide 13 consists of a dashed line 13A indicating the cutting position and an illustration of scissors 13B indicating that the dashed line 13A indicates the cutting position, and is printed or otherwise indicated on the cylindrical body 2C of the body portion 2.

[0061] Figure 5 is a schematic front view showing a bagged body 101 using the multi-layered bag 1 shown in Figure 1. Figure 6 is a schematic cross-sectional view along the line C-C' in Figure 5.

[0062] In the multilayer bag 1 according to this embodiment, the +Y side is oriented upward in the vertical direction, and the opening 2a is opened as shown in Figures 2 and 3. After any contents (powder, granules, other solids, etc.) 102 are placed inside the innermost cylindrical body 2A of the body 2 through the opening 2, the opening 2a is sealed with the second sealing portion 14, and an overtape 16 is provided, which is bonded with adhesive (including starch paste, chemical paste, or hot melt adhesive) 15 so as to straddle and cover the front and back of the second sealing portion 14. As a result, a bagged body 101 using the multilayer bag 1 is obtained, as shown in Figures 5 and 6. In this embodiment, the second sealing portion 14 does not include a sewing portion, but is composed of a heat-sealed portion 14A where the inner surfaces of the innermost cylindrical body 2A are heat-sealed together. Note that in this invention, the overtape 16 may not be provided.

[0063] Figure 7 is a schematic front view of the bagged body 101 shown in Figure 5, with the sewing machine stitching section 3A side (-Y side) facing upward in the vertical direction. In Figure 7, the upper side is considered to be the upper side in the vertical direction.

[0064] When removing the contents 102 from the bagged body 101 for use, as shown in Figure 7, the bagged body 101 is oriented so that the side with the machine-sewn portion 3A (-Y side) is on the upper vertical side, and as shown in Figures 8 and 9, an opening 2b is made in the body 2 by cutting it with scissors or other bladed tools at the cutting position indicated by the guide 13, and the contents 102 are removed from there. In this case, in the multi-layered bag 1 according to this embodiment, the guide 13 indicates a cutting position to cut off the sealing portion 3 of the body 2 and open the side with the sealing portion 3 (-Y side) of the body 2, so as shown in Figures 8 and 9, the machine-sewn portion 3 is cut off.

[0065] Figure 8 is a schematic front view showing the bagged body 101 shown in Figure 7 after it has been cut according to the guide 13 indicating the cutting position to remove the seal portion 3 and the contents 102 have been removed. Figure 9 is a schematic cross-sectional view along the line D-D' in Figure 8.

[0066] As described above, in the multilayer bag 1 after use, the sealing portion 3 is removed. Therefore, as shown in Figure 10, by pulling the innermost cylindrical body 2A relative to the cylindrical bodies 2B and 2C of the other layers in the direction of arrow W (-Y direction) in the figure, the adhesive 8 between the cylindrical bodies 2A and 2B can be easily peeled off, and the innermost cylindrical body 2A can be easily separated from the cylindrical bodies 2B and 2C of the other layers. In other words, according to the multilayer bag 1 of this embodiment, even though a machine-stitched portion is used for one of the sealing portions 3 of the body 2, after use, the innermost cylindrical body 2A that was in contact with the contents 102 can be easily separated from the cylindrical bodies 2B and 2C of the other layers. Therefore, according to this embodiment of the multi-layer bag 1, even though a machine-sewn portion 3A is used for the sealing portion 3 of one of the body portions 2, the sorting process after use of the innermost tubular body 2A and the tubular bodies 2B and 2C of the other layers, the recycling of the tubular bodies 2B and 2C of the layers other than the innermost layer that have not come into contact with the contents 102, and the recycling of the innermost tubular body A become easier. Depending on the material of the innermost tubular body A (for example, single-layer polyethylene) and the type of contents 102, even the innermost tubular body A that has come into contact with the contents 102 can be recycled.

[0067] Figure 10 is a schematic cross-sectional view illustrating the process of separating the innermost cylindrical body 2A from the cylindrical bodies 2B and 2C of the other layers, starting from the state shown in Figure 9.

[0068] Furthermore, in the multi-layered bag 1 according to this embodiment, the sewing portion 3A is positioned on the side of the opening 2a (+Y side) relative to the heat-sealed portion 3B, and since the overtape 7 does not have complete airtightness, air inside the innermost cylindrical body 2A can be released from the perforations of the sewing portion 3A in the bagged body 101 using the multi-layered bag 1. Therefore, even if multiple bagged bodies 101 using the multi-layered bag 1 according to this embodiment are stacked, the stacking stability can be increased, and the expansion of residual air that occurs at high altitudes can be avoided. In addition, since sewing thread is inserted into the perforations of the sewing portion 3A, the possibility of the contents 102 spilling out from there is reduced.

[0069] [Second Embodiment]

[0070] Figure 11 is a schematic front view illustrating the flattened state of the multilayer bag 1' according to the second embodiment of the present invention, and corresponds to Figure 1. In Figure 11, elements that are the same as or corresponding to elements in Figure 1 are denoted by the same reference numerals, and redundant explanations are omitted.

[0071] The only difference between the multilayer bag 1' according to this embodiment and the multilayer bag 1 according to the second embodiment is that the positions of the heat-seal portion 3B and the sewing portion 3A are swapped. In the multilayer bag 1, the sewing portion 3A is located on the side of the opening 2a (+Y side) relative to the heat-seal portion 3B, whereas in the multilayer bag 1', the heat-seal portion 3B is located on the side of the opening 2a (+Y side) relative to the sewing portion 3A.

[0072] In the multi-layered bag 1' according to this embodiment, the heat-sealed portion 3B is positioned on the side of the opening 2a (+Y side) relative to the machine-sewn portion 3A. Therefore, in a bagged body using the multi-layered bag 1' according to this embodiment, the airtightness inside the innermost cylindrical body 2A can be improved, making it suitable for storing contents that are sensitive to outside airflow and moisture, or contents that emit unpleasant odors.

[0073] Aside from this point, the multilayer bag 1' according to this embodiment offers the same advantages as the multilayer bag 1 according to the first embodiment.

[0074] Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

[0075] For example, in the present invention, in the first and second embodiments, the guide 13 does not need to be written on the body 2. Even if the guide 13 is not written, in a bagged body using the multilayer bag, when the contents are removed from the multilayer bag for use, an opening is made in the body by cutting the top side of the written contents 12 with scissors or other blades, and the contents are removed from there. The reason for this is that when the contents 102 are partially used and some of the contents 102 remain inside the multilayer bag, the side with the opening created by the cut will be placed on the upper side in the vertical direction, and in that case, it is very natural for the top side of the written contents 12 to be on the upper side in the vertical direction.

[0076] However, it is preferable to include the guide 13 on the body 2, as in the first and second embodiments described above, as this makes it more user-friendly.

[0077] Furthermore, in the present invention, in the first and second embodiments described above, the orientation of the written content 12 may be reversed, so that the top side of the written content 12 faces the opening 2a (+Y side) and the bottom side of the written content 12 faces the sealing portion 3 (-Y side) when written on the body 2. Even in this case, the guide 13 clearly indicates the cutting position when removing the contents 102. However, in this case the orientation of the written content 12 is somewhat unnatural, so it is preferable to determine the orientation of the written content 12 as in the first and second embodiments described above, as this is more user-friendly.

[0078] Furthermore, in this invention, the second sealing portion 14 that seals the opening 2a when forming the bagged body 101 is composed of a heat-seal portion 14A, but the second sealing portion 14 may also be composed of an adhesive portion. In this case, the inner surfaces of the innermost cylindrical body 2A do not need to be heat-sealable. [Explanation of Symbols]

[0079] 1,1' Multilayer bag 2 Torso 2a opening 2A, 2B, 2C Cylindrical bodies 3,14 Sealing section 3A Sewing machine stitching section 3B, 14A Heat seal section 7.16 Overtape 12. Contents 13 Guide 101 Bagged items 102 Containment

Claims

1. A multilayer bag having a cylindrical body with an opening at one end and the other end sealed with a sealing portion, The aforementioned body is composed of multiple layers of cylindrical bodies overlapping from the inside to the outside. The sealing portion includes a sewing machine section for sewing together the multiple layers of tubular bodies. Content visible from the outside and identifiable as top or bottom in terms of orientation is inscribed on the body such that the top side of the content faces the sealing portion and the bottom side faces the opening. A multi-layered bag characterized by the following features.

2. The multilayer bag according to claim 1, characterized in that a guide visible from the outside, indicating a cutting position for cutting off the sealing portion of the body to open the side of the body where the sealing portion is located, is indicated on the side of the body where the sealing portion is located.

3. A multilayer bag having a cylindrical body with an opening at one end and the other end sealed with a sealing portion, The aforementioned body is composed of multiple layers of cylindrical bodies overlapping from the inside to the outside. The sealing portion includes a sewing machine section for sewing together the multiple layers of tubular bodies. A guide visible from the outside, indicating a cutting position for cutting off the sealing portion of the body and opening the side of the body where the sealing portion is located, is indicated on the side of the body where the sealing portion is located. A multi-layered bag characterized by the following features.

4. The innermost cylindrical layers of the aforementioned multiple layers of cylindrical bodies can be heat-sealed together. The sealing portion includes a heat-sealed portion in which the innermost cylindrical bodies are heat-sealed together. A multi-layered bag according to any one of the features 1 to 3.

5. The multilayer bag according to claim 4, characterized in that the sewing portion is positioned on the side of the opening relative to the heat-seal portion.

6. The multilayer bag according to claim 4, characterized in that the heat-seal portion is positioned on the side of the opening relative to the machine-sewn portion.

7. The multilayer bag according to any one of claims 1 to 3, characterized in that the innermost tubular body of the multiple layers of tubular bodies and the tubular body of the layer adjacent to and overlapping with the innermost tubular body of the multiple layers of tubular bodies are bonded in a dotted manner with adhesive at multiple locations on the side of the opening.

8. The aforementioned multiple layers consist of three or more layers. The multilayer bag according to claim 7, characterized in that the cylindrical bodies of the layers other than the innermost layer among the multiple layers of cylindrical bodies, which are adjacent to each other and overlap, are bonded together with adhesive at multiple locations on the side of the opening.

9. The multilayer bag according to claim 8, characterized in that the strength of the adhesive between the innermost layer of the multilayer tubular body and the tubular body of the layer adjacent to and overlapping with the innermost layer of the multilayer tubular body is lower than the strength of the adhesive between the tubular bodies of the layers other than the innermost layer of the multilayer tubular body that are adjacent to and overlapping with each other.

10. A multilayer bag according to any one of claims 1 to 3, characterized in that it is provided with an overtape that is adhered across the front and back of the sealing portion, sandwiching and covering the front and back.

11. A bagged body characterized in that the multilayer bag according to claim 4 is used, the desired contents are contained inside the innermost tubular body, the opening is sealed with a second sealing portion, the second sealing portion includes a heat-sealed portion formed by the inner surfaces of the innermost tubular body, and the second sealing portion does not include a machine-sewn portion.

12. A bagged body characterized in that the multilayer bag according to claim 5 is used, a desired contents are contained inside the innermost tubular body, the opening is sealed with a second sealing portion, the second sealing portion includes a heat-sealed portion formed by the inner surfaces of the innermost tubular body, and the second sealing portion does not include a machine-stitched portion.

13. A bagged body characterized in that the multilayer bag according to claim 6 is used, the desired contents are contained inside the innermost tubular body, the opening is sealed with a second sealing portion, the second sealing portion includes a heat-sealed portion formed by the inner surfaces of the innermost tubular body, and the second sealing portion does not include a machine-sewn portion.

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