Sealing structure and sealing method

Abstract

To secure sealability of a package in which a content is packaged by a paper material.SOLUTION: In a sealing structure of a package 1, an end wall sheet piece protruding from a peripheral surface part 4 in a direction crossing with respect to the direction in which the peripheral surface part 4 is wound around a periphery of contents 2 is folded into a matching packaging shape and is sealed at an end wall part packaged 5 extending in a planar manner along the direction crossing with respect to the direction in which the peripheral surface part 4 extends, at least on one of a surface and a rear surface of one paper material 3 having the peripheral surface part 4 and the end wall part 5, an adhesive layer is provided beforehand, and the contents 2 are packaged by the paper material 3. The sealing structure includes a bonding part 10 in which the adhesive layer is provided beforehand in predetermined regions which are at least part of the regions opposing to each other at the place folded into the matching packaging shape in the paper material 3, and in which the predetermined regions are bonded by the adhesive layer.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sealing structure for a package. [Background technology]

[0002] A known sealing structure for packages is a structure in which the material that wraps the contents is folded in. This type of sealing structure is used in various packaging forms, such as packages wrapped with a lapped wrap (so-called "caramel wrap"), gusset bags, pillow bags, and other packages. For example, in a package using a thermoplastic film as a packaging material, a structure is known in which the thermoplastic film is sealed by welding (so-called heat sealing) a part of a folded portion (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-037453 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a paper material is used for the packaging material that is folded and sealed as described above, sealing by welding like a thermoplastic film is difficult, and there is a risk that the sealability of the package will decrease. Therefore, there is room for improvement in ensuring the sealability of a package in which the contents are wrapped in a paper material.

[0005] One of the objectives of the present invention is to ensure the sealing of a package in which the contents are wrapped in paper material. However, other objectives of the present invention are to achieve actions and effects derived from the configurations shown in the "Description of the Invention" below, which are not obtainable with conventional technology. [Means for solving the problem]

[0006] The sealing structure disclosed here is a sealing structure for a package in which an end wall sheet piece protruding from a peripheral portion in a direction intersecting the direction in which the peripheral portion is wrapped around the contents is folded into a lapped shape at an end wall portion extending in a planar manner along a direction intersecting the extension direction of the peripheral portion and sealed, and an adhesive layer is provided in advance on at least one of the front and back surfaces of a sheet of paper material having the peripheral portion and the end wall portion, and the contents are packaged in the paper material. This sealing structure has an adhesive layer provided in advance in a predetermined area, which is at least a part of the area that faces each other at the point where the paper material is folded into the overlapping wrapping mold, and has a bonding portion in which the predetermined area is bonded together by the adhesive layer. Effect of the Invention

[0007] According to the present invention, the sealability of the package in which the contents are wrapped in paper material can be ensured. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view showing a first example of a package. [Diagram 2] FIG. 11 is a perspective view showing a second example of a package. [Diagram 3] FIG. 13 is a perspective view illustrating a procedure for folding into a folded package. [Figure 4] This is an exploded view (reverse view) showing the main parts of the back side of the paper material. [Diagram 5] This is an exploded view (surface view) showing the main parts of the front side of the paper material. [Figure 6] FIG. 13 is a bottom view showing a modified example of the combined package. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment for carrying out a sealing structure of a package will be described. The sealing structure of the present embodiment is a structure for sealing a package in which contents are packaged with a sheet of paper material (packaging material). In this sealing structure, the package is sealed by bonding together opposing areas of parts of the paper material.

[0010] In the following embodiment, the package is placed on a horizontal surface, and the horizontal direction is broadly divided into the front-rear direction (in the drawings, the front is indicated by "F" and the rear is indicated by "B") and the left-right direction (in the drawings, the left is indicated by "L" and the right is indicated by "R"). In addition, in the vertical direction, the direction in which gravity acts is defined as downward (indicated by "D" in the drawings), and the opposite direction of downward is defined as upward (indicated by "U" in the drawings).

[0011] In addition, for paper materials used in packaging, the "front side" refers to one side of the paper material when it is unfolded (hereinafter referred to as the "unfolded state") and the side that generally faces away from the contents when the contents are packaged (hereinafter referred to as the "packaged state"). Conversely, the other side in the unfolded state and the side that generally faces the contents when packaged is referred to as the "back side." For paper materials in an unfolded state, the mutually perpendicular X and Y directions are used as references. Additionally, unless otherwise specified, any number is defined as "number N1" and any number greater than number N1 is defined as "number N2," and the expression "number N1 to number N2" means a range greater than or equal to number N1 and less than or equal to number N2.

[0012] I. One embodiment In the embodiment described below, a structure will be described in which the paper material is sealed by pasting together the folded portions in a wrapping manner. In this embodiment, the configuration regarding the sealing structure is described in item [1], and the action and effect of the configuration of item [1] is described in item [2].

[0013] [1. Configuration] In this section [1], the packages to which the sealing structure is applied are outlined in subsection [1-1], and the structure that seals this package is described in detail in subsection [1-2]. The package includes contents and a paper material for packaging the contents. The structure for sealing the package may include a structure in which at least the folded portions of the paper material are sealed by bonding together. In other words, the portions of the paper material other than the bonded portions and the contents are not essential to the sealing structure.

[0014] [1-1. Package Overview] As shown in FIGS. 1 and 2, a package 1 has contents 2 wrapped in a paper material 3. Various items can be applied as the contents 2. Examples of contents include household paper products such as toilet rolls, tissue paper, kitchen paper, and hand towels. As in the package 1 illustrated in FIG. 1, the toilet roll of the contents 2 may be packaged in a paper material 3, or as in the package 1 illustrated in FIG. 2, the tissue paper contents 2 may be packaged in a paper material 3.

[0015] The paper material 3 is a packaging material (wrapping paper) made of paper. As the paper material 3, various materials such as one-sided glossy paper, double-sided glossy paper, and wood-framed paper can be used depending on the packaging purpose. In one-sided glossy paper, the glossy side is smoother than the non-glossy side, and one of the back side 6 (see Figure 4) and front side 7 (see Figure 5) of the paper material 3 is smoother than the other. In double-glossy paper, both the back side 6 and front side 7 are smooth and glossy. One method for producing such glossy paper is to apply a gloss finish to one side of a paper base material in which both the back side 6 and front side 7 are not smooth. One-sided glossy paper can be produced by applying a gloss finish to one side of the paper base material, and double-glossy paper can be produced by applying a gloss finish to both sides of the paper base material. In addition, both the back surface 6 and the front surface 7 of the paper are non-smooth.

[0016] The glossy side has a lower wettability than the non-glossy side, so it tends to be easier to ensure waterproofing with the glossy side, whereas the non-glossy side has a higher wettability than the glossy side, so it tends to be easier to ensure printability with the non-glossy side. For this reason, it is preferable to use one-sided glossy paper or double-sided glossy paper (paper material 3 having a glossy surface) as paper material 3 used for packaging household paper products that require waterproofing. Single-sided glossy paper used for paper material 3 can ensure waterproofing due to the glossy surface on one side. Double-sided glossy paper used for paper material 3 can enhance waterproofing due to the glossy surfaces on both sides.

[0017] Furthermore, it is preferable to use one-sided glossy paper or wood paper (paper material 3 having a non-smooth surface) as the paper material 3 used for packaging to be printed. One-sided glossy paper used for the paper material 3 can ensure printability on one side, which is the non-glossy surface. Wood paper used for the paper material 3 can ensure printability on both sides. Furthermore, it is preferable to use one-sided glossy paper (paper material 3 having both glossy and non-glossy sides) as paper material 3 used for packaging that requires waterproofing and is printed. One-sided glossy paper used for paper material 3 can ensure waterproofing due to the glossy side on one side, while ensuring printability on the non-glossy side. As a specific example, when one-sided glossy paper with a glossy side as back side 6 (back side 6 is the glossy side) and a non-glossy side as front side 7 (front side 7 is the glossy side) is used as paper material, waterproofing is maintained due to the glossy side of back side 6, while front side 7 has excellent printability.

[0018] This paper material 3 is roughly divided into the following two parts depending on its position relative to the contents 2 in the packaged state. - Surrounding part 4: Part that is wrapped around the contents 2 End wall portion 5: A portion that covers the contents 2 except for the portion around which the peripheral portion 4 is wrapped.

[0019] The peripheral portion 4 is a portion that is wrapped around the contents 2 in the horizontal direction on the outside and extends in the vertical direction. End wall portions 5 are connected to the peripheral portion 4 on both the top and bottom. The end wall portion 5 is a portion extending in a planar shape along the horizontal direction (a direction intersecting the extending direction of the peripheral portion 4). The end wall portion 5 is a portion where an end wall sheet piece 5' (see FIG. 3) protruding in the up-down direction (a direction intersecting the wrapping direction of the peripheral portion 4) from the peripheral portion 4 is folded in a wrap-around manner and sealed.

[0020] Next, the folded shape at the end wall portion 5 into a folded shape will be described with reference to Fig. 3. This folded shape is achieved by folding into a folded shape in the following steps A to D. Step A: The end wall sheet pieces 5' are stuck to the top and bottom of the peripheral portion 4 wrapped around the contents 2. Let it out Step B: Fold down the left and right sheet pieces 5A' of the end wall sheet pieces 5' Step C: Fold down either the front or rear sheet piece 5B' of the end wall sheet piece 5'. Step D: Fold down the other sheet piece 5C', either the front or rear, of the end wall sheet pieces 5'.

[0021] In addition, the dimensions of the end wall sheet pieces 5' protruding upward and downward in step A are set to be slightly smaller than the dimensions of the contents 2 in the front-rear direction. Hereinafter, the area of ​​the end wall portion 5 corresponding to the left and right sheet pieces 5A' in step B will be referred to as the "inner sheet portion 5A" (first sheet portion). Also, the area of ​​the end wall portion 5 corresponding to either the front or rear sheet piece 5B' in step C will be referred to as the "middle sheet portion 5B" (second sheet portion), and the area of ​​the end wall portion 5 corresponding to the other of the front or rear sheet pieces 5C' in step D will be referred to as the "outer sheet portion 5C" (third sheet portion).

[0022] Various fold lines are formed in the paper material 3 whose end wall portions 5 are folded into a folded shape as described above. As shown in FIG. 4, the back surface 6 of the paper material 3 has three types of fold lines as shown below. Horizontal fold line F1: A valley fold line extending in the X direction at the boundary between the peripheral surface portion 4 and the end wall portion 5. Vertical fold line F2: A fold line in the Y direction at the boundary between the inner sheet portion 5A and the middle sheet portion 5B or the outer sheet portion 5C. A fold line including a mountain fold line extending in the direction Inclined fold line F3: Horizontal fold line F1 and vertical fold line F2 in the middle sheet portion 5B and the outer sheet portion 5C Angle of 45[°] in both the X and Y directions from the intersection of F2 A valley fold line that slopes at a degree

[0023] The fold lines F1 to F3 extend horizontally in the end wall portion 5. The horizontal fold line F1 extends along the base edge of the end wall sheet piece 5' and surrounds the end wall portion 5. As shown in Fig. 4, the horizontal fold line F1 extends over the entire area of ​​the paper material 3 in the X direction. The vertical fold lines F2 are fold lines extending inward from the left and right ends at the front and rear of the end wall portion 5. The vertical fold lines F2 also include valley fold lines extending in the up-down direction at the peripheral surface portion 4.

[0024] Here, the following four vertical fold lines F2 are given as examples. Each of the vertical fold lines F2 extends over the entire Y-direction of the paper material 3 in the unfolded state. First vertical fold line F21: A vertical fold line F2 extending to the left front of package 1 Second vertical fold line F22: A vertical fold line F2 extending to the left rear of package 1 Third vertical fold line F23: A vertical fold line F2 extending to the right rear of package 1 Fourth vertical fold line F24: A vertical fold line F2 extending to the right front of package 1

[0025] These fold lines F21 to F24 extend over the entire vertical area of ​​the peripheral surface portion 4 at the four corners of the package 1, and extend over a portion of the end wall portion 5 in the horizontal direction. The first vertical fold line F21 and the second vertical fold line F22 extend from the left end to the right in the end wall portion 5, and are provided as a pair of fold lines arranged in the front and rear. The third vertical fold line F23 and the fourth vertical fold line F24 extend from the right end to the left in the end wall portion 5, and are provided as a pair of fold lines arranged in the front and rear.

[0026] The inclined fold line F3 is a fold line that extends from the intersection of the horizontal fold line F1 and each of the four vertical fold lines F2 to the tip edge of the end wall portion 5. Here, the following four inclined fold lines F3 are provided corresponding to the vertical fold lines F21 to F24. First inclined fold line F31: An inclined fold line F3 extending from the left front of package 1 Second inclined fold line F32: An inclined fold line F3 extending from the left rear of package 1 Third inclined fold line F33: An inclined fold line F3 extending from the right rear of package 1 Fourth inclined fold line F34: An inclined fold line F3 extending from the right front of package 1

[0027] 5, the front surface 7 of the paper material 3 has fold lines F1'-F3' corresponding to the fold lines F1-F3 on the back surface 6. That is, the front surface 7 has fold lines F1'-F3' obtained by replacing the valley fold lines on the back surface 6 with mountain fold lines and by replacing the mountain fold lines with valley fold lines. Specifically, a horizontal fold line F1' is provided on the surface opposite to the horizontal fold line F1 on the back surface 6 (that is, the front surface 7).

[0028] In addition, a vertical fold line F2' is provided on the surface opposite to the vertical fold line F2 on the back surface 6, and an inclined fold line F3' is provided on the surface opposite to the inclined fold line F3 on the back surface 6. In detail, a first vertical fold line F21', a second vertical fold line F22', a third vertical fold line F23', and a fourth vertical fold line F24' are provided as the vertical fold line F2', and a first inclined fold line F31', a second inclined fold line F32', a third inclined fold line F33', and a fourth inclined fold line F34' are provided as the inclined fold line F3.

[0029] The end wall portion 5 is folded into a folded shape by mountain folding and valley folding along the above-mentioned fold lines F1 to F3 and F1' to F3'. The end wall portion 5 folded in this manner is roughly divided into the following two regions. - Facing area: Area where part of paper material 3 faces Non-facing area: Area where paper material 3 does not face (area excluding the facing area) The facing area is configured as a pair of areas, one facing area and the other facing area.

[0030] 4, the facing region 8 is partially disposed on the back surface 6 of the end wall portion 5. The facing region 8 is divided into the following two regions. First back area 81: Area where back surface 6 faces front surface 7 (Back area, front facing area) Second back area 82: Area where the back surfaces 6 face each other The second back area 82 is configured as a pair of areas facing each other (at least one of the back area and the back facing area) and the other area facing the first area (at least the other of the back area and the back facing area).

[0031] The first back region 81 is a planar region extending from the tip edge side of the end wall portion 5 toward the horizontal fold line F1 at an intermediate portion between the second vertical fold line F22 and the third vertical fold line F23 in the outer sheet portion 5C. Here, a rectangular region is illustrated as an example of the first back region 81. The second back region 82 is a planar region including a horizontal fold line F1 and a vertical fold line F2 on two sides in each of the middle sheet portion 5B and the outer sheet portion 5C. Here, a square (rectangular) region is illustrated as an example of the second back region 82. The second back region 82 in the outer sheet portion 5C is adjacent to the first back region 81 in the X direction. The non-facing area of ​​the back surface 6 excluding the back areas 81 and 82 forms an inner surface facing the contents 2 .

[0032] 5, the facing region 9 is partially disposed on the front surface 7 of the end wall portion 5. The facing region 9 is further divided into the following two regions. First front area 91: Area where the front surface 7 faces the back surface 6 (Front area, back facing area) Second front area 92: Area where the front surfaces 7 face each other The second front area 92 is configured as a pair of an area facing each other (at least one of the front area and the front-facing area) and another area facing the first area (at least the other of the front area and the front-facing area).

[0033] The first front area 91 is an area facing the first back area 81, and is composed of the following two areas. Region I: In the middle sheet portion 5B, from the first vertical fold line F21′ to the end wall sheet piece 5′ A region spaced apart in the X direction by the Y direction dimension from the tip edge side of the end wall portion 5 A planar area extending from the fold line F1 to the horizontal fold line F2 Region II: In the middle sheet portion 5B, from the fourth vertical fold line F24′ to the end wall sheet piece 5′ A region spaced apart in the X direction by the Y direction dimension from the tip edge side of the end wall portion 5 A planar area extending from the fold line F1′ to the horizontal fold line F1′ These regions I and II are regions that face the first back region 81 in the packaged state, and rectangular regions are shown here as an example.

[0034] The second front area 92 is an area extending on both sides of the vertical fold line F2' in the X direction. More specifically, the second front area 92 is provided in an area having a shape formed by combining right-angled isosceles triangles (FIG. 5 shows the areas facing each other with different dot sizes). The non-facing area of ​​the front surface 7 excluding the front areas 91 and 92 forms an outer surface of the package 1 that is exposed to the outside.

[0035] In addition, the side edges of the paper material 3 in the X direction (shown by diagonal lines in Figs. 4 and 5) are overlapped one on the other and pasted together into a cylindrical shape before step A. For this pasting, an adhesive layer, the details of which will be described later in item [1-2], may be used, or a known adhesive (such as hot melt) applied separately from the adhesive layer may be used.

[0036] [1-2. Details of sealing structure] Next, the sealing structure of the package 1 will be described in detail. In this sealing structure, an adhesive layer is provided in advance on at least one of the back surface 6 and the front surface 7 of the paper material 3, and the package 1 is sealed at the bonding portion formed by bonding the two surfaces together with this adhesive layer. The adhesive layer is provided in advance in a predetermined area, which is at least a part of the area (ie, the facing areas 8, 9) that faces each other at the portion of the paper material 3 that is folded into a folded wrapping shape.

[0037] This adhesive layer is provided in a state where it is exposed on the surface of the paper material (base material) whose main component is pulp in the paper material 3. When an adhesive layer is applied to the surface of the back surface 6 of the paper material 3, an adhesive layer (second adhesive layer) is provided on the back surface 6, and when an adhesive layer is applied to the surface of the front surface 7 of the paper material 3, an adhesive layer (first adhesive layer) is provided on the front surface 7. Note that the "adhesive layer" referred to here is coated (added separately) onto the paper material 3, and therefore can be considered a functional layer that not only imparts adhesive properties to the paper material 3, but also improves various functions such as waterproofness, barrier properties, strength, and abrasion resistance. These various functions tend to be more easily exhibited when an adhesive layer is provided on the paper material 3 by lamination processing. The reasons for this include that lamination is a common method of providing an adhesive layer on the entire surface of the back surface 6 or front surface 7 of the paper material 3, rather than just a portion of it, and that the adhesive layer tends to be thicker than other processes such as coating.

[0038] Examples of areas on the paper material 3 where an adhesive layer is provided include various patterns 1 to 15 shown in Table 1 below. In addition, "entire surface" in Table 1 refers to the planar surface area corresponding to the entire area of ​​the peripheral surface portion 4 and the end wall portion 5. In addition, pattern 0 in Table 1 is a pattern in which no adhesive layer is provided on either the back surface or the front surface of the paper material, and is added for reference.

[0039] [Table 1]

[0040] <Back side> In patterns 0 to 3, no adhesive layer is provided over the entire surface of back surface 6. In patterns 4 to 7, an adhesive layer is provided over the entire surface of back surface 6. In patterns 8 to 15, no adhesive layer is provided on the back surface 6 of the peripheral portion 4. In patterns 8 to 11, an adhesive layer is provided on the entire back surface 6 of the end wall portion 5, and in patterns 12 to 15, an adhesive layer is provided only on a portion of the back surface 6 of the end wall portion 5.

[0041] In patterns 4 to 15, an adhesive layer is provided on at least a predetermined part (a part included in a predetermined region) of the back surface 6. The back portion includes at least a part of the facing region 8 on the back surface 6 of the end wall portion 5. The part of the end wall portion 5 on which the adhesive layer is provided in the patterns 12 to 15 may be a part (one area) of the facing region 8 on the back surface 6, or may be a portion (one area) including the entire facing region 8 (entire area).

[0042] In the patterns 12 to 15, when an adhesive layer is provided in a part of the facing region 8 on the back surface 6, the adhesive layer may be provided only in the first back region 81, or only in the second back region 82, or an adhesive layer may be provided in both of these back regions 81 and 82. In this case, an adhesive layer may be provided in part or all of each of the back regions 81 and 82.

[0043] Furthermore, when an adhesive layer is provided in the second back region 82, the adhesive layer may be provided in at least a part of only one of the regions (back region) facing each other in the second back region 82. On the other hand, when an adhesive layer is provided in the second back region 82, an adhesive layer may be provided in at least a portion of each of one facing region and the other facing region in the second back region 82. In this case, the adhesive layers of one region (back region, back facing region) and the other region (back region, back facing region) may face each other in a packaged state.

[0044] <Front side> In patterns 0, 4, 8, and 12, no adhesive layer is provided over the entire surface of the front surface 7, while in patterns 1, 5, 9, and 13, an adhesive layer is provided over the entire surface of the front surface 7. In patterns 2, 3, 6, 7, 10, 11, 14, and 15, no adhesive layer is provided on the front surface 7 of the peripheral portion 4. In patterns 2, 6, 10, and 14, an adhesive layer is provided on the entire front surface 7 of the end wall portion 5, and in patterns 3, 7, 11, and 15, an adhesive layer is provided only on a portion of the front surface 7 of the end wall portion 5.

[0045] In patterns 1 to 3, 5 to 7, 9 to 11, and 13 to 15, an adhesive layer is provided on at least a predetermined portion, that is, a front portion (a portion included in a predetermined region), of the front surface 7. This front portion includes at least a portion of the facing region 9 on the front surface 7 of the end wall portion 5. The part of the end wall portion 5 on which the adhesive layer is provided in the patterns 3, 7, 11, and 15 may be a part (one area) of the facing region 9 on the front surface 7, or may be a portion (one area) including the entire facing region 9 (all areas).

[0046] In the case of patterns 3, 7, 11, and 15, when an adhesive layer is provided in a part of the facing region 9 on the front surface 7, the adhesive layer may be provided only in the first front region 91, the adhesive layer may be provided only in the second front region 92, or the adhesive layer may be provided in both of these front regions 91 and 92. In this case, the adhesive layer may be provided in part or in the whole of each of the front regions 91 and 92.

[0047] Furthermore, when an adhesive layer is provided in the second front region 92, the adhesive layer may be provided in at least a part of only one of the regions (front region) facing each other in the second front region 92. On the other hand, when an adhesive layer is provided in the second front region 92, an adhesive layer may be provided in at least a portion of each of one region and the other region facing each other in the second front region 92. In this case, the adhesive layers of one region (front region, front facing region) and the other region (front region, front facing region) may face each other in a packaged state.

[0048] <Pattern example> For example, in pattern 4, an adhesive layer is provided over the entire surface of the back surface 6, and no adhesive layer is provided on the front surface 7. In pattern 5, an adhesive layer is provided over the entire surface of both the back surface 6 and the front surface 7. In patterns 6 and 7, an adhesive layer is provided over the entire surface of the back surface 6, and an adhesive layer is provided on at least a portion of the end wall portion 5 of the front surface 7. In patterns 10, 11, 14, and 15, an adhesive layer is provided only on at least a portion of the end wall portion 5 of both the back surface 6 and the front surface 7.

[0049] As shown in patterns 1 to 15, the adhesive layer can be disposed on either the back surface 6 or the front surface 7. However, it is preferable that the adhesive layer be disposed on the front surface 7 as in patterns 1 to 3, 5 to 7, 9 to 11, and 13 to 15, and it is more preferable that the adhesive layer be disposed only on the front surface 7 as in patterns 1 to 3. When an adhesive layer is disposed on the front surface 7 as the outermost layer of the package 1, the waterproofing function of this adhesive layer can ensure the waterproofing of the package 1. In this case, if printing is applied to the outside of the paper material 3 and then an adhesive layer is provided on the outside of that by, for example, lamination processing, the protection of the printing can also be ensured. When an adhesive layer is provided only on the front surface 7, it is possible to prevent the adhesive layer from adhering to the contents 2. Furthermore, it is particularly preferable that an adhesive layer is provided only on the front surface 7, and that an adhesive layer is provided on a part of the front surface 7 by heat seal coating (pattern printing). In this case, it is also possible to reduce the environmental load by increasing the ratio of paper material in the package 1.

[0050] <Laminating section> The adhesive layers provided in the various patterns 1 to 15 as described above perform an adhesive function for sealing the package 1 at the end wall portion 5. In the patterns 4 to 15 in which an adhesive layer is provided on the back surface 6, the package 1 is sealed by a back bonding portion (bonding portion) in which the facing region 8 of the back surface 6 in the end wall portion 5 is bonded with the adhesive layer provided on the back surface 6.

[0051] In patterns 1-3, 5-7, 9-11, and 13-15 in which an adhesive layer is provided on front surface 7, package 1 is sealed by a front bonding portion (bonding portion) in which facing area 9 of front surface 7 in end wall portion 5 is bonded to front surface 7 with an adhesive layer. 1 and 2 show an example of a back-side bonding portion 11 (bonding portion 10) bonded by adhesive layers of patterns 12 to 15, and an example of a front-side bonding portion 12 (bonding portion 10) bonded by adhesive layers of patterns 3, 7, 11, and 15.

[0052] <Other> The adhesive layer used for bonding in the above-mentioned sealing structure may be made of various known materials including thermoplastic materials. Various known methods can be used to provide an adhesive layer on the paper material 3. An example of a method for providing an adhesive layer on the entire back surface 6 or front surface 7 is lamination, and an example of a method for providing an adhesive layer on a portion of the back surface 6 or front surface 7 is heat seal coating (heat seal printing). Other examples of parameters related to the package 1 of this embodiment are listed below. Basis weight of paper material 3: 20-60 [g / m 2 ] Coating weight of the adhesive layer laminated on paper material 3: 5 to 40 [g / m 2 ] Coating weight of heat-sealed adhesive layer on paper material 3: 1 to 40 [g / m 2 ] -Tear strength of paper material 3: 150 [mN] or more

[0053] [2. Actions and Effects] Since the sealing structure of the present embodiment is configured as described above, it is possible to obtain the following actions and effects. (1) At least a part of the facing regions 8, 9 of the paper material 3 that is folded into a folded package is bonded to the bonding unit 10 by an adhesive layer provided in the part. In this way, at least a part of the facing regions 8, 9 are bonded to the folded part of the end wall portion 5. This ensures the sealability of the package 1.

[0054] When a thermoplastic material is used for the adhesive layer, heat is not applied to the end wall portion 5 until the above-mentioned step D is completed to prevent the adhesive function from being exerted, which contributes to smooth folding of the sheet portions 5A to 5C of the end wall portion 5. In this case, by applying heat to the end wall portion 5 after the above-mentioned step D is completed to melt the adhesive layer (i.e., "welding"), the facing regions 8 and 9 can be bonded without using any adhesive means such as adhesive or adhesive tape separately from the paper material 3. This is suitable for efficiently bonding predetermined regions continuously on a manufacturing line for the package 1, and is suitable for use in an automatic packaging machine that automatically packages the contents 2 with the paper material 3 to manufacture the package 1.

[0055] (2) According to patterns 1-3, 5-7, 9-11, and 13-15 in which an adhesive layer is provided on the front surface 7, it is possible to bond the front surface 7, compared to patterns (0,) 4, 8, and 12 in which an adhesive layer is provided only on the back surface 6, which helps to ensure the sealing ability of the package 1. (3) If an adhesive layer is provided in the second front region 92 where the front surfaces 7 of the patterns 1-3, 5-7, 9-11, and 13-15 face each other, the adhesive layer can seal the areas that cannot be bonded with the adhesive layer provided on the back surface 6. This also ensures the sealability of the package 1.

[0056] (4) According to patterns 4 to 15 in which an adhesive layer is provided on the back surface 6, compared to patterns 1 to 3 in which an adhesive layer is provided only on the front surface 7, it is possible to bond the back surface 6, which helps to ensure the sealing ability of the package 1. (5) In the patterns 4 to 15 having an adhesive layer on their back surfaces 6, if an adhesive layer is provided in the second back area 82 where the back surfaces 6 face each other, it is possible to seal the areas that cannot be bonded with the adhesive layer provided on the front surface 7. From this point of view, the sealability of the package 1 can be ensured.

[0057] (6) According to patterns 2, 3, 6, 7, 10, 11, 14, and 15 in which an adhesive layer is provided on a portion of the front surface 7, no adhesive layer is provided on the front surface 7 in the peripheral portion 4, so that the material for the adhesive layer can be reduced. Furthermore, according to patterns 3, 7, 11, and 15 in which the adhesive layer on the front surface 7 is provided only on a portion of the end wall portion 5, the amount of adhesive layer used on the end wall portion 5 can be reduced more than in patterns 2, 6, 10, and 14. Thus, the material for the adhesive layer can be further reduced.

[0058] Similarly, according to patterns 8 to 15 in which an adhesive layer is provided on a portion of the back surface 6, the adhesive layer material can be reduced because no adhesive layer is provided on the back surface 6 in the peripheral surface portion 4. Furthermore, according to patterns 12 to 15 in which the adhesive layer on the back surface 6 is provided only on a portion of the end wall portion 5, the amount of adhesive layer used on the end wall portion 5 can be reduced more than in patterns 8 to 11. Therefore, the adhesive layer material can be reduced even further. According to these patterns 2, 3, 6, 7, and 8 to 15, the material cost of the package 1 can be reduced, which in turn contributes to reducing the environmental load caused by the disposal of the adhesive layer material.

[0059] (7) In the patterns 1 to 15 provided with an adhesive layer, if an adhesive layer is provided in the first back region 81 or the first front region 91 where the back surface 6 and the front surface 7 face each other, the back surface 6 and the front surface 7 can be bonded together. Since the first back region 81 and the first front region 91 are generally bonded together in a laminated packaging form, it is also possible to ensure the versatility of the sealing structure. Furthermore, if an adhesive layer is provided in both the first back region 81 and the first front region 91, these regions 81, 91 can be reliably bonded together by the two adhesive layers. This also ensures the sealability of the package 1.

[0060] (8) According to patterns 4 to 7 in which an adhesive layer is provided over the entire back surface 6 and patterns 1, 5, 9, and 13 in which an adhesive layer is provided over the entire front surface 7, the device and setting for providing the adhesive layer only partially can be suppressed or omitted, which contributes to simplifying the manufacturing equipment and manufacturing process. When an adhesive layer is provided over the entire back surface 6 or front surface 7 in this way, it is also possible to use existing wrapping paper in which an adhesive layer is applied over the entire area of ​​one side as the paper material 3.

[0061] (9) In addition, according to patterns 1, 4 to 7, 9, and 13 in which an adhesive layer is provided entirely on at least one of the back surface 6 and the front surface 7, various functions such as waterproofness, barrier properties, strength, and abrasion resistance are enhanced throughout the package 1 by the adhesive layer. In particular, when an adhesive layer is provided on the paper material 3 by lamination processing, various functions can be improved. For example, it is possible to prevent the contents 2 from getting wet by improving waterproofness, to prevent the paper material 3 from breaking by improving strength and abrasion resistance, and ultimately to ensure the appearance of the package 1 by preventing damage due to wetness or abrasion.

[0062] [II. Modifications] The above-described embodiment is merely an example, and is not intended to exclude various modifications and application of techniques not explicitly stated in the embodiment. Each configuration of the present embodiment can be modified in various ways without departing from the spirit of the embodiment. In addition, the configurations can be selected as necessary, and can be combined appropriately.

[0063] For example, when one-sided glossy paper with the glossy side as the back side and the non-glossy side as the front side is used as the paper material, and an adhesive layer is provided on both the back side and the front side as in the above-mentioned patterns 5 to 7, 9 to 11, and 13 to 15, it is preferable to set the coating amount of the adhesive layer on the back side and the adhesive layer on the front side to be greater or less. In paper materials with such settings, the non-glossy side has higher wettability than the glossy side, so the adhesive that constitutes the adhesive layer on the non-glossy front side tends to penetrate the paper material more easily than the adhesive that constitutes the adhesive layer on the glossy back side. In paper materials with such a tendency, it is preferable to set the coating amount of the adhesive that constitutes the adhesive layer on the non-glossy side (front side) to be greater than that on the glossy side (back side), taking into account the degree of penetration of the adhesive on each of the front and back sides.

[0064] In detail, in the area of ​​the paper material where the front and back surfaces face each other, it is preferable that the coating amount per unit area of ​​the adhesive constituting the adhesive layer on the front surface (non-glossy surface) (the first adhesive layer pre-applied on the front surface facing the back surface) is set to be greater than the coating amount per unit area of ​​the adhesive constituting the adhesive layer on the back surface (glossy surface) (the second adhesive layer pre-applied on the back surface facing the front surface). By using a one-sided glossy paper material in which the amount of adhesive applied has been adjusted as described above, the amount of adhesive applied that constitutes the adhesive layer on the back side (glossy side) can be reduced, while ensuring the adhesive function of both the adhesive layer on the back side and the adhesive layer on the front side without waste, and the areas of the front and back sides that face each other can be reliably sealed.

[0065] In addition to the adhesive layer, a functional layer may be added to the paper material of the package. Specific examples of the functional layer include a functional layer having abrasion resistance (such as a varnish coating layer), a functional layer having water resistance, and a functional layer having barrier properties. The functional layer having abrasion resistance can increase the abrasion resistance of the package, and when provided outside a visible printed area on the package, can also improve the protection of the print. The functional layer having water resistance can prevent the contents from being stained or damaged even if the package gets wet. The functional layer having barrier properties can prevent the transfer of odors from the outside of the package to the contents, and can prevent the leakage of the scent of the contents to which a fragrance has been added.

[0066] Incidentally, since the paper material used in the packaging material of this package generally has a higher specific heat than the thermoplastic film of the packaging material, when a thermoplastic material is used in the adhesive layer, the thermal energy for melting the adhesive layer should be set higher than the thermal energy for welding the thermoplastic film. For example, it is necessary to set the temperature for melting the adhesive layer higher than the welding temperature of the thermoplastic film, or to set the time for applying the temperature to the adhesive layer longer than the welding time of the thermoplastic film. Application of such thermal energy may result in adhesion of the contents by the molten adhesive layer.

[0067] Therefore, it is also preferable not to provide an adhesive layer on the non-facing area (i.e., the "inner surface") of the back side of the paper material. Specifically, it is also preferable that no adhesive layer is provided in the following three types of non-facing areas. First non-facing area (first inner surface): The entire area of ​​the inner sheet Second non-facing area (second inner surface): Area other than the second back facing area in the middle sheet part Third non-facing region (third inner surface): First back region and second back region in the outer sheet part Areas other than the region

[0068] As for the third non-facing region, it is also preferable that no adhesive layer is provided in the entire region extending along the horizontal fold line between the horizontal fold line and the first back region. It is also preferable that the region without the adhesive layer is provided symmetrically with respect to the horizontal fold line. That is, it is preferable that no adhesive layer is provided on either side of the horizontal fold line in the Y direction. For example, when there is some variation in the height position of the upper end edge surrounding the upper surface of the contents, it is preferable not to provide an adhesive layer in the region according to the height dimension that may vary. As a specific example, when the height position of the upper end edge of the contents varies by about ±10 [mm], it is preferable to set an additional 0 to 10 [mm] as a margin for this ±10 [mm], and the Y direction dimension of the region including the horizontal fold line and without the adhesive layer is 10 to 20 [mm]. Since no adhesive layer is provided on the inner surface facing the contents as described above, it is possible to avoid adhesion of the adhesive layer on the inner surface to the contents.

[0069] The adhesive layer may not be provided on the entire peripheral portion of the back surface of the paper material as in the above-mentioned patterns 1 to 3 and 9 to 15, and may be provided only on a part of the peripheral portion. When the adhesive layer is provided only on a part of the peripheral portion of the back surface of the paper material, it is preferable that the adhesive layer is provided on a part of the area spaced from the horizontal fold line in the Y direction (up and down direction), and that the adhesive layer is not provided in the area close to the horizontal fold line (for example, the area with no adhesive layer having a Y direction dimension of 10 to 20 mm as described above). By providing an adhesive layer only on a portion of the peripheral surface, the material cost of the adhesive layer can be reduced compared to a package in which an adhesive layer is provided on the entire peripheral surface.

[0070] Alternatively, the adhesive layer on the back surface may have a lower adhesive strength than the adhesive layer on the front surface. In other words, the adhesive layer on the front surface may be provided so that the adhesive layer on the front surface mainly performs the adhesive function, while the adhesive layer on the back surface performs the auxiliary adhesive function. Specifically, a design may be adopted in which the amount of adhesive layer applied per unit area is smaller for the adhesive layer on the back surface than for the adhesive layer on the front surface (amount applied on the back surface < amount applied on the front surface). In this way, by setting the amount of coating depending on the location of the adhesive layer, it is possible to prevent the adhesive layer from adhering to the contents, and it is also possible to ensure that the adhesive layer on the front surface adheres to the contents using the adhesive layer on the back surface.

[0071] With regard to the side edges for pasting the paper material into a cylindrical shape, it is preferable not to provide an adhesive layer or adhesive in a specified margin area from the end of the paper material in the X direction (the leftmost or rightmost end in Figures 4 and 5), but to provide an adhesive layer or adhesive inward in the X direction from this margin area. In this way, by not providing an adhesive layer or adhesive in the margin area, it is possible to prevent unnecessary adhesion due to an adhesive layer or adhesive that may protrude from the side edge of the paper material in the X direction. For example, in an automatic packaging machine that automatically packages contents with paper material to manufacture packages, it is possible to prevent the occurrence of problems such as unnecessary adhesion of paper material, peeling of the side edge due to this adhesion, and soiling of the paper material 3.

[0072] The form in which the present package is folded into a lapped shape is not limited to the form in which the edge of the paper material on the peripheral portion is positioned in the left-right center and is provided in the middle sheet portion as illustrated in Figures 1 to 3. For example, as shown in Figure 6, the edge E" of the paper material 3" on the peripheral portion may be positioned offset from the left-right center (offset to the right in Figure 6) and the edge E" of the paper material on the peripheral portion may be provided in the outer sheet portion 5C". According to such a lapped shape folded shape, the paper material can be folded more smoothly and the appearance of the folded crease can be improved compared to a form in which the edge of the paper material on the peripheral portion is folded in the middle sheet portion.

[0073] Alternatively, the side edge for pasting the paper material into a cylindrical shape is not limited to being disposed in the middle sheet portion, but may be disposed in the outer sheet portion. In this case, the first back region is provided in the outer sheet portion including the side edge of the paper material, and the first front region is provided in the middle sheet portion not including the side edge of the paper material. In addition, in order to ensure that the package is easy to open, opening aids such as perforations or cutting tape may be added to the paper material. The directions explained in the above embodiment may be interpreted as the directions of Orientations 1 to 5 shown in Table 2 below.

[0074] [Table 2] [Explanation of symbols]

[0075] 1 package 2 Contents 3 Paper materials 4 Peripheral part 5 End wall 5A Inner sheet part (first sheet part) 5B Middle sheet part (second sheet part) 5C Outer sheet part (third sheet part) 5′ End wall sheet piece 5A' Left and right sheet pieces 5B' Either the front or rear sheet piece 5C' The other outer sheet piece, either the front or rear 6 Back side 7 Front side 8 (back side 6) facing area 81 First Back Area 82 Second Back Area 9 (Front side 7) Facing area 91 First Front Area 92 Second Front Area 10. Lamination section 11 Back bonding part 12 Front lamination section F1, F1′ horizontal fold line F2, F2' vertical fold line F21, F21' first vertical fold line F22, F22' second vertical fold line F23, F23' third vertical fold line F24, F24' fourth vertical fold line F3, F3' inclined fold line F31, F31' first inclined fold line F32, F32' second inclined fold line F33, F33' third inclined fold line F34, F34' fourth inclined fold line

Claims

1. A sealing structure for a package in which an end wall sheet piece protruding from a peripheral portion in a direction intersecting a direction in which the peripheral portion is wrapped around a content is folded and sealed in a lapped shape at an end wall portion extending in a planar manner along a direction intersecting the extending direction of the peripheral portion, and an adhesive layer is provided in advance on at least one of a front surface and a back surface of a sheet of paper material having the peripheral portion and the end wall portion, and the content is packaged in the paper material, The adhesive layer is provided in advance in a predetermined area that is at least a part of the area of ​​the paper material that faces each other at the folded portion into the folded wrapping shape, and a bonding portion is provided in which the predetermined areas are bonded together by the adhesive layer, The bonding portion is a front portion that is at least a predetermined portion of the front surface of the paper material, the front portion including at least a portion of the front portion that faces the paper material in the end wall portion, a first adhesive layer being provided on the front portion in advance, and a front bonding portion in which the front portion is bonded to a front facing area that faces the front portion by the first adhesive layer; the predetermined region includes a back portion that is at least a predetermined part of the back surface, the back portion includes at least a part of the back portion of the end wall portion where the back portion faces the paper material, a second adhesive layer is provided on the back portion in advance, and a back bonding portion is provided in which the back portion is bonded to a back facing region facing the back portion by the second adhesive layer, The back portion of the back bonding portion includes the back area facing the front surface, The paper material is a one-sided glossy paper having a glossy back surface and a non-glossy front surface, the rear region is bonded to the rear facing region of the front surface facing the rear region by the first adhesive layer and the second adhesive layer; The coating amount per unit area of ​​the adhesive constituting the first adhesive layer is set to be greater than the coating amount per unit area of ​​the adhesive constituting the second adhesive layer. A sealing structure characterized by:

2. The front portion of the front bonding portion includes the front area where the front surfaces face each other. The sealing structure according to claim 1 .

3. The front portion of the front bonding portion includes the front region facing the back surface.

3. The sealing structure according to claim 1 or 2.

4. The first adhesive layer is provided in advance on the entire surface of the front surface of the end wall portion. The sealing structure according to any one of claims 1 to 3.

5. The first adhesive layer is provided in advance on a part of the front surface of the end wall portion. The sealing structure according to any one of claims 1 to 3.

6. The first adhesive layer is provided in advance on the entire surface of the front surface of the peripheral portion. The sealing structure according to any one of claims 1 to 5.

7. The first adhesive layer is not provided on the front surface of the peripheral portion. The sealing structure according to any one of claims 1 to 5.

8. The back portion of the back bonding portion includes the back region where the back surfaces face each other. The sealing structure according to any one of claims 1 to 7.

9. The second adhesive layer is provided in advance on the entire surface of the back surface of the end wall portion. The sealing structure according to any one of claims 1 to 8.

10. The second adhesive layer is provided in advance on a part of the back surface of the end wall portion. The sealing structure according to any one of claims 1 to 8.

11. The second adhesive layer is provided in advance on the entire surface of the back surface of the peripheral surface portion. The sealing structure according to any one of claims 1 to 10.

12. The second adhesive layer is not provided on the back surface of the peripheral portion. The sealing structure according to any one of claims 1 to 10.

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