Packaging bags

Abstract

To provide a packaging bag that can prevent unintended opening by the user. [Solution] The packaging bag according to the present invention comprises a first sheet material folded over at both ends in the width direction and a second sheet material with a tab formed thereon, the second sheet material having a pair of overlapping portions that overlap with a pair of side edges of the first sheet material or its vicinity along the longitudinal direction, the pair of overlapping portions and the pair of side edges of the first sheet material forming a pair of first sealing regions that are sealed along the longitudinal direction from one end to the other of each sheet material, one or a pair of second sealing regions that are sealed over the entire width direction on at least one end of each sheet material in the longitudinal direction, and the tab is fixed on three sides by the pair of first sealing regions and the one or a pair of second sealing regions.

Description

Technical Field

[0005]

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

Background Art

[0002] Conventionally, a packaging bag composed of two sheet materials is known. The packaging bag is configured by using one sheet material as a bag body part that forms a storage part and has an opening in a part thereof, and using the other sheet material as a lid part that covers the opening. A grip part that serves as a starting point for opening the packaging bag is provided at the periphery of the lid part.

[0003] As such a packaging bag, for example, the packaging bag described in Patent Document 1 includes a first sheet material whose side ends are folded back in the width direction and a second sheet material. The side edge of the first sheet material and the side edge of the second sheet material are overlapped, and a portion where they are overlapped except for one end side in the longitudinal direction of the first sheet material and the second sheet material is sealed. In the packaging bag, a grip part is formed at one end side in the longitudinal direction of the second sheet material because a portion where they are overlapped at one end side in the longitudinal direction of the first sheet material and the second sheet material is not sealed.

[0004] Also, for example, the pillow packaging bag described in Patent Document 2 includes a film formed in a pillow bag shape and a strip-shaped film that covers the opening of the pillow packaging bag. One side edges and the other side edges of the respective films are overlapped, and the inside of the overlapped portion is heat-sealed in a narrow width along the side edges of the respective films. In the pillow packaging bag, with such a configuration, grip parts that protrude outward from the heat-sealed portions are formed at both side edges of the strip-shaped film.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] However, in packaging bags as described in Patent Documents 1 and 2, the tab that serves as the starting point for opening is detached from the bag body. For example, when a product packaged in such a bag is displayed on a shelf, a user (purchaser, employee, etc.) may inadvertently grab the tab or snag it on the shelf when picking up the product, causing the packaging bag to open unintentionally.

[0007] This invention has been made in view of the current situation, and aims to provide a packaging bag that can prevent unintended opening by the user. [Means for solving the problem]

[0008] The packaging bag according to the present invention is formed into a bag shape using a packaging material made of sheet material, The aforementioned sheet material comprises a first sheet material and a second sheet material that overlaps with the first sheet material. The first sheet material is folded back at both ends in the width direction, The second sheet material has a pair of overlapping portions along its longitudinal direction, where one side edge or its vicinity overlaps with one side edge of the first sheet material, and the other side edge or its vicinity overlaps with the other side edge of the first sheet material. A pair of first sealing regions are formed, in which the pair of overlapping portions and the pair of side edges of the first sheet material are sealed along the longitudinal direction from one end to the other of the first sheet material and the second sheet material. At least one end of the first sheet material and the second sheet material in the longitudinal direction, one or a pair of second sealing regions are formed, in which the first sheet material and the second sheet material are sealed over the entire width direction. The second sheet material has a tab formed on it. The knob portion is fixed on three sides by a pair of first sealing regions and one second sealing region, or by one first sealing region and a pair of second sealing regions.

[0009] With this configuration, the tab formed on the second sheet material of the packaging bag is fixed on three sides by the pair of first sealing regions and the one second sealing region, or the one first sealing region and the pair of second sealing regions. Therefore, the tab that serves as the starting point for opening the bag does not become loose before opening. Accordingly, the packaging bag can prevent unintended opening by the user.

[0010] In the packaging bag according to the present invention, the sealing strength between the first sheet material and the second sheet material may be weaker than the sealing strength between the first sheet materials in the second sealing region.

[0011] With this configuration, when the second sheet material is peeled off to open the packaging bag, the overlapping portions of the first sheet material in the second sealing area do not peel apart in the direction of separation, and the second sheet material can be peeled off. Therefore, the packaging bag can be opened while maintaining its shape.

[0012] In the packaging bag according to the present invention, a weak seal layer may be formed on the side of the second sheet material that overlaps with the first sheet material.

[0013] With this configuration, the packaging bag has a weak seal layer, and the second sheet material overlaps with the first sheet material on the surface where the weak seal layer is formed. As a result, the seal strength between the first and second sheet materials in the first and second seal regions is weakened. Therefore, the packaging bag can be easily opened because the second sheet material can be peeled off with little force. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a packaging bag that can prevent unintended opening by the user.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 is a perspective view of a packaging bag 1 according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a sectional view taken along the line I-I of FIG. 1. [Figure 3] FIG. 3 is an enlarged view of one end edge 11 of the packaging bag 1 according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a view showing the state of opening the packaging bag 1 according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a perspective view of a packaging bag 1 according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a sectional view taken along the line II-II of FIG. 5. [Figure 7] FIG. 7 is an enlarged view of one end edge 11 of the packaging bag 1 according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a view showing the state of opening the packaging bag 1 according to the second embodiment of the present invention. [Figure 9] FIG. 9 is a sectional view of the packaging bag 1 for explaining one modification example of a pair of side edges 21, 21 of the first sheet 2. [Figure 10] FIG. 10 is a sectional view of the packaging bag 1 for explaining another modification example of a pair of side edges 21, 21 of the first sheet 2.

Modes for Carrying Out the Invention

[0016] Hereinafter, the packaging bag 1 according to the embodiment of the present invention will be described with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

[0017] In this specification, the longitudinal direction means the direction along the long side of the packaging bag, and the width direction means the direction along the short side of the packaging bag and perpendicular to the longitudinal direction.

[0018] In this specification, the inner surface of the sheet material refers to the inner surface of the packaging bag, and the outer surface of the sheet material refers to the outer surface of the packaging bag.

[0019] In this specification, the front of the packaging bag means the side on which the opening is provided, and the back of the packaging bag means the side located opposite to the front of the packaging bag.

[0020] (First Embodiment) The packaging bag 1 according to the first embodiment of the present invention will be described below with reference to Figures 1 to 4.

[0021] Figure 1 is a perspective view of a packaging bag 1 according to the first embodiment of the present invention. As shown in Figure 1, the packaging bag 1 according to this embodiment is formed in a bag shape using a packaging material made of sheet material.

[0022] The aforementioned sheet material comprises a first sheet material 2 and a second sheet material 3.

[0023] As shown in Figures 1 and 2, the length of the second sheet material 3 in the longitudinal direction is the same as the length of the first sheet material 2 in the same direction, and the length of the second sheet material 3 in the width direction is shorter than the length of the packaging bag 1 in the same direction.

[0024] A weak seal layer 30, 30 is formed on the side of the second sheet material 3 that overlaps with the first sheet material 2. Specifically, as shown in Figure 2, the weak seal layers 30, 30 are formed in pairs along both side edges 31, 31 of the second sheet material 3.

[0025] The aforementioned weak seal layers 30, 30 are formed by applying a part coat. In addition to applying a part coat, the weak seal layer 30 may also be formed by, for example, attaching a film or using an easy-peel film as the second sheet material 3.

[0026] As shown in Figure 1, the second sheet material 3 overlaps with the first sheet material 2.

[0027] Figure 2 is a cross-sectional view of Figure 1, part II. Specifically, as shown in Figure 2, the first sheet material 2 is folded back so that both side ends 211, 211 of the first sheet material 2 face each other. At this time, the first sheet material 2 is folded back by making gusset folds between the central part of the first sheet material 2 and both side ends 211, 211 of the first sheet material 2. As a result, a pair of gusset portions 13, 13, which will become the sides of the packaging bag 1 according to this embodiment, are formed on the first sheet material 2.

[0028] As shown in Figures 1 and 2, in the packaging bag 1 according to this embodiment, one side edge 31 of the second sheet 3 and one side edge 21 of the first sheet material 2 overlap along the longitudinal direction, and the other side edge 31 of the second sheet 3 and the other side edge 21 of the first sheet material overlap. Specifically, as shown in Figure 2, the inner surface of the second sheet material 3 (the surface on which the weak seal layer 30 is formed) and the outer surface of the first sheet material 2 overlap, with the side edges of each sheet material overlapping. At this time, as shown in Figure 1, one end edge 32 of the second sheet material 3 overlaps with one end edge 22 of the first sheet material 2, and the other end edge 33 of the second sheet material 3 overlaps with the other end edge 23 of the first sheet material 2. As a result, the second sheet material 3 has a pair of overlapping portions 34, 34 along its longitudinal direction, where one side edge 31 overlaps with one side edge 21 of the first sheet material 2 and the other side edge 31 overlaps with the other side edge 21 of the first sheet material 2.

[0029] As shown in Figure 2, the pair of overlapping portions 34, 34 are arranged along the longitudinal direction on the surface of the weak seal layers 30, 30.

[0030] As shown in Figures 1 and 2, the packaging bag 1 according to this embodiment has a pair of first sealing regions H1, H1 formed by heat sealing along the longitudinal direction from one end to the other of the first sheet material 2 and the second sheet material 3, with the pair of overlapping portions 34, 34 and the pair of side edges 21, 21 of the first sheet material 2.

[0031] As shown in Figure 1, in the packaging bag 1 according to this embodiment, a second seal area H2 is formed at one end in the longitudinal direction of the first sheet material 2 and the second sheet material 3, with the first sheet material 2 and the second sheet material 3 heat-sealed over the entire width direction.

[0032] Figure 3 is an enlarged view of one end edge 11 of the packaging bag 1 according to the first embodiment of the present invention. Specifically, as shown in Figure 3, the one second seal region H2 is composed of a pair of first overlapping regions H21, H21 formed by the overlapping and welding of a pair of gusset portions 13, 13 at both ends in the width direction, a second double overlapping region H22 formed by the overlapping and welding of the central part of the second sheet material 3 and the central part of the first sheet material 2 in the width direction, and a pair of third overlapping regions H23, H23 formed by the overlapping and welding of a pair of overlapping portions 34, 34 of the second sheet material 3, a pair of side edges 21, 21 of the first sheet material 2 and a pair of gusset portions 13, 13 between the first overlapping regions H21, H21 and the second double overlapping region 22.

[0033] Furthermore, the pair of third overlapping regions H23, H23 intersect with the pair of first sealing regions H1, H1.

[0034] As described above, in the packaging bag 1 according to this embodiment, since the pair of first sealing regions H1, H1 are formed along the pair of overlapping portions 34, 34 arranged on the surface of the weak sealing layers 30, 30, in one of the second sealing regions H2, the sealing strength between the first sheet material 2 and the second sheet material 3 (specifically, the sealing strength of the pair of first overlapping regions H21, H21 and the sealing strength of the overlapping portion of the first sheet material 2 and the second sheet material 3 in the pair of third overlapping regions H23, H23) is weaker than the sealing strength between the first sheet material 2 and the first sheet material 2 (specifically, the sealing strength of the pair of first overlapping regions H21, H21 and the sealing strength of the overlapping portion of the first sheet material 2 and the second sheet material 3 in the pair of third overlapping regions H23, H23).

[0035] As shown in Figure 1, a tab 4 is formed on one longitudinal end of the second sheet material 2, which serves as the starting point for opening the packaging bag 1 according to this embodiment. Specifically, as shown in Figures 1 and 3, the tab 4 is formed when one end edge 22 of the second sheet material 2 is surrounded by the pair of first sealing regions H1, H1 and the second sealing region H2.

[0036] Figure 4 shows how to open the packaging bag 1 according to the first embodiment of the present invention. In this embodiment, since the tab portion 4 is formed in the longitudinal direction of the packaging bag 1, as shown in Figure 4, the second sheet material 3 can be easily peeled off along the pair of first sealing regions H1, H1. This makes it possible to neatly open the packaging bag 1 while maintaining a constant width of the opening 14, which will be described later.

[0037] As shown in Figures 1 and 3, the three sides of the tab portion 4 are fixed by the pair of first sealing regions H1, H1 and the one second sealing region H2. As a result, in the packaging bag 1 according to this embodiment, the tab portion 4 does not become detached at one end edge 11 of the packaging bag 1. For example, when a product packaged in the packaging bag 1 is displayed on a shelf, it is possible to prevent the packaging bag 1 from being opened by accidentally pinching the tab portion 4 or catching the tab portion 4 on the shelf when the user (purchaser, employee, etc.) picks up the product, thereby preventing unintended opening by the user.

[0038] The knob 4 is coated with ink or the like, although this is not shown in the figure. This improves the visibility of the knob 4, allowing the user to locate it.

[0039] Although not shown in the illustration, the corner of one end of the knob 4 in the longitudinal direction is colored with ink or the like along the edge. This allows the user to identify the position of the knob 4.

[0040] Furthermore, as shown in Figure 1, a pair of guide indicators 5, 5 are provided at the corner of one end of the handle 4 in the longitudinal direction. This allows the user to identify the location of the handle 4 and to be guided to the starting point for opening. The pair of guide indicators 5, 5 can be formed by printing on the handle 4 using ink or the like. In the packaging bag 1 according to this embodiment, as shown in Figures 1 and 3, the shape of the pair of guide indicators 5, 5 is triangular, indicating the corner of one end of the handle 4 in the longitudinal direction, but the shape is not particularly limited as long as it is visible to the user.

[0041] As shown in Figures 1 and 2, the packaging bag 1 according to this embodiment has an opening 14 on its front surface. The opening 14 is formed by being surrounded by a pair of side edges 21, 21 of the first sheet 2, one end edge 11 of the packaging bag 1, and the other end edge 12 of the packaging bag 1, which will be described later. As shown in Figures 1 and 2, the opening 14 is located in the center of the packaging bag 1 and is covered by the second sheet 3. The position of the opening 14 is not particularly limited and, for example, may be shifted towards the side edge of the packaging bag 1 from the center in the width direction. Furthermore, the position of the opening 14 can be appropriately changed according to the size and type of food X, user convenience, etc.

[0042] Examples of food items X contained in the packaging bag 1 according to this embodiment include hot dogs, sandwiches, bread, rice balls, and the like.

[0043] The first sheet material 2 is a single-layer biaxially oriented polypropylene (OPP) sheet. The first sheet material 2 may also be, for example, a polyethylene (PE) sheet, an unoriented polypropylene (CPP) sheet, a polyethylene terephthalate (PET) sheet, a nylon (NY) sheet, etc. In this specification, the term "polypropylene sheet" includes not only 100% pure polypropylene sheets, but also sheets that primarily consist of polypropylene and contain other components (such as polyethylene or other resin components).

[0044] The second sheet material 3 consists of a single layer of polyethylene terephthalate (PET) sheet. The second sheet material 3 may also be made of materials other than polyethylene terephthalate (PET), such as polyethylene (PE) sheet, unoriented polypropylene (CPP) sheet, biaxially oriented polypropylene (OPP) sheet, or nylon (NY) sheet. Furthermore, the second sheet material 3 may be made of an easy-peel film for easier opening.

[0045] The second sheet material 3 may be made of the same material as the first sheet material 2, or it may be made of a different material.

[0046] The packaging bag 1 according to this embodiment is manufactured as follows. Specifically, first, the pair of side edges 21, 21 of the first sheet 2, which has gussets formed on both ends in the width direction, and the pair of overlapping portions 34, 34 of the second sheet material 3 are overlapped, and the first sealing regions H1, H1 are formed by heat sealing along the longitudinal direction from one end to the other of the overlapped portion. Next, the first sealing region H2 is formed by heat sealing along the width direction at one end of the first sheet material 2 and the second sheet material 3 in the longitudinal direction so that the entire overlapping portion is welded together. As a result, the one end edge 32 of the second sheet material 3 is surrounded by the pair of first sealing regions H1, H1 and the one second sealing region H2, forming a tab portion 4, and a bag-shaped packaging material is formed with the other end of the first sheet material 2 and the second sheet material 3 in the longitudinal direction open. Then, the food X is placed inside the sheet through the opening of the bag-shaped packaging material, the opening is closed and folded over in the longitudinal direction, and a label or other seal is attached to the folded part to form the other end edge 12 of the bag, thereby manufacturing the packaging bag 1 according to this embodiment, which is a horizontal gusset bag shape with a tab 4 at one end edge 11 of the packaging bag 1.

[0047] (Second Embodiment) Hereinafter, the differences between the packaging bag 1 according to the second embodiment of the present invention and the packaging bag 1 according to the first embodiment of the present invention will be described with reference to Figures 5 to 8.

[0048] Figure 5 is a perspective view of a packaging bag 1 according to a second embodiment of the present invention. The packaging bag 1 according to the second embodiment of the present invention differs from the packaging bag 1 according to the first embodiment of the present invention in that, as shown in Figure 5, it is a pillow bag type having gusset portions 13, 13 on both sides in the width direction and a back sealing portion 15 on the back.

[0049] Figure 6 is a cross-sectional view taken along line II-II of Figure 5. As shown in Figures 5 and 6, the packaging bag 1 according to this embodiment is composed of a first sheet material 2 having a pair of first sheet pieces 20, 20 and a second sheet material 3.

[0050] Specifically, as shown in Figure 6, the first sheet material 2 is formed by overlapping the inner surfaces of one side edge 201A, 201A of the first sheet pieces 20, 20 and heat sealing them to form the back-bonded portion 15. Also, as shown in Figure 6, the first sheet material 2 is folded back at both ends in the width direction so that the other side edges 201B1, 201B1 of the first sheet pieces 20, 20 face each other.

[0051] As shown in Figure 6, on the side of the second sheet material 3 that overlaps with the first sheet material 2, a pair of weak seal layers 30, 30 are formed along the longitudinal direction near both side edges 31, 31 of the second sheet material 3.

[0052] In this embodiment, as shown in Figures 5 and 6, the packaging bag 1 has the following characteristics along its longitudinal direction: the vicinity of one side edge 31 of the second sheet 3 overlaps with one of the other side edges 201B, 201B of the first sheet pieces 20, 20, and the vicinity of the other side edge 31 of the second sheet 3 overlaps with the other side edge 201B, 201B of the first sheet pieces 20, 20. Specifically, as shown in Figure 6, the inner surface of the second sheet material 3 (the surface on which the pair of weak seal layers 30, 30 are formed) overlaps with the outer surface of the first sheet pieces 20, 20, and the pair of weak seal layers 30, 30 and the other side edges 201B, 201B of the first sheet pieces 20, 20 overlap. At this time, as shown in Figure 5, one end edge 32 of the second sheet material 3 overlaps with one end edge 202, 202 of the first sheet pieces 20, 20, and the other end edge 33 of the second sheet material 3 overlaps with the other end edges 203, 203 of the first sheet pieces 20, 20. As a result, the second sheet material 3 has a pair of overlapping portions 34, 34 along its longitudinal direction, where the vicinity of one side edge 31 overlaps with one of the other side edges 201B, 201B of the first sheet pieces 20, 20, and the vicinity of the other side edge 31 of the second sheet material 3 overlaps with the other side edge 201B, 201B of the first sheet pieces 20, 20.

[0053] As shown in Figures 5 and 6, the packaging bag 1 according to this embodiment has a pair of first sealing regions H1, H1 formed by heat sealing the pair of overlapping portions 34, 34 and the other side edges 201B, 201B of the first sheet pieces 20, 20 along the longitudinal direction from one end to the other of the pair of first sheet pieces 20, 20 and the second sheet material 3.

[0054] Furthermore, as shown in Figure 5, the packaging bag 1 according to this embodiment has a pair of second sealing regions H2, H2 formed at both ends of the first sheet pieces 20, 20 and the second sheet material 3, where the first sheet pieces 20, 20 and the second sheet material 3 are heat-sealed over the entire width direction. That is, the pair of second sealing regions H2, H2 are formed at both ends in the longitudinal direction of the first sheet material 2 (the pair of first sheet pieces 20, 20) and the second sheet material 3.

[0055] Figure 7 is an enlarged view of one end edge 11 of the packaging bag 1 according to the second embodiment of the present invention. As shown in Figure 7, the second seal region H2 on the end edge 11 side of the pair of second seal regions H2, H2 consists of a pair of fourth overlapping regions H24, H24 formed by overlapping and welding a pair of folded and overlapping first sheet pieces 20, 20 and the second sheet material 3 at both ends in the width direction, and a fifth overlapping region H25 formed by overlapping and welding the central part of the second sheet material 3 and the vicinity of one side edge 201A, 201A of the pair of first sheet pieces 20, 20 (i.e., the vicinity of the back sealing portion 15 of the first sheet material) at the center in the width direction.

[0056] As described above, in the packaging bag 1 according to this embodiment, since the pair of first sealing regions H1, H1 are formed along the pair of overlapping portions 34, 34 arranged on the surface of the weak sealing layers 30, 30, the sealing strength between the first sheet material 2 and the second sheet material 3 (specifically, the sealing strength of the fifth overlapping region H25) is weaker than the sealing strength between the first sheet materials 2 (specifically, the sealing strength of the overlapping portion between the pair of first sheet pieces 20, 20 in the pair of fourth overlapping regions H24, H24).

[0057] Furthermore, of the pair of second seal regions H2, H2, the second seal region H2 on the other end edge 12 side has the same configuration as the second seal region H2 on the one end edge 11 side.

[0058] As shown in Figure 5, tabs 4,4 are formed on the side edges 21,21 of the second sheet material 2, which serve as the starting point for opening the packaging bag 1 according to this embodiment. Specifically, as shown in Figures 5 and 7, the tabs 4,4 are formed when the side edges 21,21 of the second sheet material 2 are surrounded by one of the pair of first seal regions H1,H1 and the pair of second seal regions H2,H2.

[0059] Figure 8 shows how to open a packaging bag 1 according to the second embodiment of the present invention. In this embodiment, since the tabs 4, 4 are formed in the width direction of the packaging bag 1, when opening the packaging bag 1, as shown in Figure 8, first the second sheet material 3 is peeled off in one of the pair of second seal regions H2, H2, and then the second sheet material 3 is peeled off along the pair of first seal regions H1, H1. In this way, the opening of the packaging bag 1 is performed in two stages, which prevents the packaging bag 1 from being opened forcefully, and thus prevents the food X from spilling out when opened.

[0060] As shown in Figures 5 and 7, the three sides of the tabs 4, 4 are fixed by the one first sealing region H1 and the pair of second sealing regions H2, H2. As a result, in this embodiment, the tabs 4, 4 do not become loose at the side edges of the packaging bag 1.

[0061] Although not shown in the illustration, the side edge of one of the knobs 4, 4 is colored with ink or the like along its edge. This allows the user to identify the location of the one knob 4.

[0062] Furthermore, as shown in Figures 5 and 7, a plurality of guide indicators 5 are provided near the side edge of one of the handles 4, 4. This allows the user to identify the location of the handle 4 and to be guided to the starting point for opening. The plurality of guide indicators 5 can be formed by printing on the handle 4 using ink or the like. In the packaging bag 1 according to this embodiment, as shown in Figures 5 and 7, the shape of the plurality of guide indicators 5 is triangular, indicating the corner on the side end of the handle 4, but the shape is not particularly limited as long as it is visible to the user.

[0063] The packaging bag 1 according to this embodiment is manufactured as follows. Specifically, first, the other side edges 201B, 201B of the first sheet pieces 20, 20 and the pair of overlapping portions 34, 34 of the second sheet material 3 are overlapped, and the overlapped portion is heat-sealed along the longitudinal direction from one end to the other to form the first sealing region H1, H1, thereby forming a sheet-like packaging material with the second sheet material in the center. Next, the food X is placed in the center of the sheet-like packaging material, both sides of the sheet-like packaging material are folded back to form gusset portions 13, 13 at both ends, the inner surfaces of the side edges of the sheet-like packaging material (one side edge 201A, 201A of the pair of first sheet pieces 20, 20) are overlapped, and the overlapped portion is heat-sealed to form a back sealing portion 15, thereby forming the sheet-like packaging material into a cylindrical shape so as to wrap the food X. Then, one end and the other end of the tubular sheet-like packaging material are heat-sealed to form the pair of second sealing regions H2, H2. As a result, each of the two side edges 31, 31 of the second sheet material 3 is surrounded by one first sealing region H1 and the pair of second sealing regions H2, H2, thereby forming the tabs 4, 4. Thus, a pillow bag-shaped packaging bag 1 according to this embodiment, having tabs 4, 4 on its side edges, is manufactured.

[0064] The packaging bag 1 according to the first and second embodiments of the present invention is formed in a bag shape using a packaging material made of sheet material, The aforementioned sheet material comprises a first sheet material 2 and a second sheet material 3 that overlaps with the first sheet material 2. The first sheet material 2 is folded back at both ends in the width direction, The second sheet material 3 has a pair of overlapping portions 34, 34 along its longitudinal direction, where one side edge 31 or its vicinity overlaps with one side edge 21 of the first sheet material 2, and the other side edge 31 or its vicinity overlaps with the other side edge 21 of the first sheet material 2. A pair of first sealing regions H1, H1 are formed, in which the pair of overlapping portions 34, 34 and the pair of side edges 21, 21 of the first sheet material 2 are sealed along the longitudinal direction from one end to the other of the first sheet material and the second sheet material. At least one end of the first sheet material 2 and the second sheet material 3 in the longitudinal direction, one or a pair of second sealing regions H2 are formed, in which the first sheet material 2 and the second sheet material 3 are sealed over the entire width direction. The second sheet material 3 has a tab portion 4 formed therein. The knob portion 4 is fixed on three sides by a pair of first sealing regions H1, H1 and a second sealing region H2, or by a single first sealing region H1 and a pair of second sealing regions H2, H2.

[0065] With this configuration, the tab 4 formed on the second sheet material 3 of the packaging bag 1 is fixed on three sides by the pair of first sealing regions H1, H1 and the one second sealing region H2, or the one first sealing region H1 and the pair of second sealing regions H2, H2. Therefore, before opening, it does not form any loose pieces that could serve as an opening point. Accordingly, the packaging bag 1 can prevent unintended opening by the user.

[0066] In the packaging bag 1 according to the first and second embodiments of the present invention, in the second seal region H2, the seal strength between the first sheet material 2 and the second sheet material 3 is weaker than the seal strength between the first sheet material 2 itself. Therefore, when the packaging bag 1 is opened by peeling off the second sheet material 3, the overlapping portion of the first sheet material 2 in the second seal region H2 does not peel off in the direction of separation, and the second sheet material 3 can be peeled off without separating, thus allowing the bag to be opened while maintaining its shape.

[0067] In the packaging bag 1 according to the first and second embodiments of the present invention, a weak seal layer 30 is formed on the surface of the second sheet material 3 that faces the first sheet material 2. As a result, the second sheet material 3 overlaps with the first sheet material on the surface where the weak seal layer 30 is formed, thus weakening the seal strength between the first sheet material 2 and the second sheet material 3 in the first seal region H1 and the second seal region H2. Therefore, the packaging bag 1 can be easily opened because the second sheet material 3 can be peeled off with little force.

[0068] Although the first and second embodiments of the present invention have been described above, the present invention can be modified in various ways without being limited to the above embodiments.

[0069] For example, in the packaging bag 1 according to the above embodiment, the first sheet material 3 was described as a single-layer sheet. However, the present invention is not limited thereto, and for example, the first sheet material 3 may be a laminated sheet consisting of at least two or more layers. The laminated sheet may be, for example, a form in which a plurality of plastic sheets are laminated, or a form in which a plastic sheet is laminated on at least one surface of a base material made of paper, nonwoven fabric, etc.

[0070] For example, in the packaging bag 1 according to the above embodiment, the second sheet material 3 was described as a single-layer sheet. However, the present invention is not limited thereto, and for example, the second sheet material 3 may be a laminated sheet consisting of at least two or more layers. The laminated sheet may be in the form of multiple plastic sheets laminated together, or it may be in the form of a plastic sheet laminated on at least one surface of a base material layer made of paper, nonwoven fabric, etc.

[0071] For example, in the packaging bag 1 according to the above embodiment, it has been explained that weak seal layers 30, 30 are formed along both side edges of the second sheet material 3. However, the present invention is not limited thereto, and for example, the weak seal layer 30 may be formed over the entire surface of one side of the second sheet material 3. In this case, the weak seal layer 30 may be formed, for example, by applying a part coat or the like over the entire surface, or by laminating an easy-peel film or the like over the entire surface of one side of the second sheet material 3. Furthermore, the present invention does not require that the weak seal layer 30 be formed on the second sheet material 3. Furthermore, the present invention may also require that the weak seal layer 30 be formed on the first sheet material 2.

[0072] For example, in the packaging bag 1 according to the above embodiment, the first seal area H1 was described as being formed by heat sealing. However, the present invention is not limited thereto, and for example, the first seal area H1 may be formed by cold sealing, adhesive, or the like.

[0073] For example, in the packaging bag 1 according to the above embodiment, the second seal area H2 was described as being formed by heat sealing. However, the present invention is not limited thereto, and for example, the second seal area H2 may be formed by cold sealing, adhesive, or the like.

[0074] For example, in the packaging bag 1 according to the above embodiment, it was explained that in the second sealing region H2, the sealing strength between the first sheet material 2 and the second sheet material 3 is weaker than the sealing strength between the first sheet material 2 and the first sheet material 3. However, the present invention is not limited thereto, and for example, in the second sealing region H2, the sealing strength between the first sheet material 2 and the first sheet material 2 may be about the same as the sealing strength between the first sheet material 2 and the second sheet material 3.

[0075] For example, in the packaging bag 1 according to the above embodiment, it has been explained that a guide display section 5 is provided on the tab 4. However, the present invention is not limited thereto, and for example, the guide display section 5 may not be provided on the tab 4.

[0076] For example, in the packaging bag 1 according to the first embodiment of the present invention, it has been described that one second seal region H2 is formed at one end in the longitudinal direction of the first sheet material 2 and the second sheet material 3. However, the present invention is not limited thereto, and for example, a pair of second seal regions H2 may be formed at both ends in the longitudinal direction of the first sheet material 2 and the second sheet material 3.

[0077] For example, in the packaging bag 1 according to the first embodiment of the present invention, it was described that the tab portion 4 is coated with ink or the like. However, the present invention is not limited thereto, and for example, the tab portion 4 does not have to be coated with ink or the like.

[0078] For example, in the packaging bag 1 according to the first embodiment of the present invention, it was described that the corner on one end of the tab portion 4 in the longitudinal direction is colored along the edge with ink or the like. However, the present invention is not limited thereto, and for example, the corner on one end of the tab portion 4 in the longitudinal direction does not have to be colored along the edge with ink or the like.

[0079] For example, in the packaging bag 1 according to the second embodiment of the present invention, it has been explained that the side edge of one of the tabs 4, 4 is colored along the edge with ink or the like. However, the present invention is not limited thereto, and for example, both side edges of the tabs 4, 4 may be colored along the edge with ink or the like, or the side edges of the tabs 4, 4 may not be colored along the edge with ink or the like.

[0080] For example, the packaging bag 1 according to the first embodiment of the present invention has been described as being in the shape of a gusseted bag. However, the present invention is not limited thereto, and for example, the form of the packaging bag 1 may be a pillow bag, a three-sided bag, a satchel bag, or the like.

[0081] For example, the packaging bag 1 according to the second embodiment of the present invention has been described as being pillow-shaped with gusset portions 13, 13 on both sides in the width direction. However, the present invention is not limited thereto, and for example, the form of the packaging bag 1 may be a three-sided bag or the like.

[0082] Furthermore, it has been explained that the packaging bag 1 according to the first and second embodiments of the present invention has gusset portions 13, 13 on both ends in the width direction. However, the present invention is not limited thereto, and for example, in any form of the packaging bag 1, the gusset portion 13 may be located on only one of the two ends in the width direction, or the gusset portions 13, 13 may not be located on either end in the width direction.

[0083] For example, in the packaging bag 1 according to the first embodiment of the present invention, the length of the second sheet material 3 in the longitudinal direction is the same as the length of the first sheet material 2 in the same direction, and the length of the second sheet material 3 in the width direction is shorter than the length of the packaging bag 1. However, the present invention is not limited thereto, and for example, the length of the second sheet material 3 in the longitudinal direction may be the same as the length of the first sheet material 2 in the same direction, and the length of the second sheet material 3 in the width direction may be the same as the length of the packaging bag 1 in the same direction.

[0084] For example, in the packaging bag 1 according to the second embodiment of the present invention, it has been explained that the length of the second sheet material 3 in the longitudinal direction is the same as the length of the first sheet material 2 in the same direction, and the length of the second sheet material 3 in the width direction is the same as the length of the packaging bag 1 in the same direction. However, the present invention is not limited thereto, and for example, the length of the second sheet material 3 in the longitudinal direction may be the same as the length of the first sheet material 2 in the same direction, and the length of the second sheet material 3 in the width direction may be shorter than the length of the packaging bag 1 in the same direction.

[0085] For example, as shown in Figures 9 and 10, the first sheet material 2 may have at least one of its pair of side edges 21, 21 folded over to the outside of the packaging bag 1 after the first sheet material 2 has been folded over at both ends in the width direction. Figure 9 is a cross-sectional view of the packaging bag 1 illustrating one variation of the pair of side edges 21, 21 of the first sheet 2. As shown in Figure 9, as one variation, both of the pair of side edges 21, 21 of the first sheet material 2 may be folded over to the outside of the packaging bag 1. Figure 10 is a cross-sectional view of the packaging bag 1 illustrating another variation of the pair of side edges 21, 21 of the first sheet 2. As shown in Figure 10, as another variation, one of the pair of side edges 21, 21 may be folded over to the outside of the packaging bag 1.

[0086] The present invention includes the following embodiments. [1] A bag-shaped packaging material made of sheet material, The aforementioned sheet material comprises a first sheet material and a second sheet material that overlaps with the first sheet material. The first sheet material is folded back at both ends in the width direction, The second sheet material has a pair of overlapping portions along its longitudinal direction, where one side edge overlaps with one side edge of the first sheet material and the other side edge overlaps with the other side edge of the first sheet material. A pair of first sealing regions are formed, in which the pair of overlapping portions and the pair of side edges of the first sheet material are sealed along the longitudinal direction from one end to the other of the first sheet material and the second sheet material. At least one end of the first sheet material and the second sheet material in the longitudinal direction, one or a pair of second sealing regions are formed, in which the first sheet material and the second sheet material are sealed over the entire width direction. The second sheet material has a tab formed on it. A packaging bag in which the tab portion is fixed on three sides by a pair of first sealing regions and one second sealing region, or by one first sealing region and a pair of second sealing regions. [2] The packaging bag according to [1], wherein in the second sealing region, the sealing strength between the first sheet material and the second sheet material is weaker than the sealing strength between the first sheet materials themselves. [3] The packaging bag according to [1] or [2], wherein a weak seal layer is formed on the side of the second sheet material that overlaps with the first sheet material.

[0087] It should be noted that the packaging bag according to the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. Furthermore, the packaging bag according to the present invention is not limited by the effects of the embodiments described above. That is, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims, not by the above description. Moreover, the scope of the present invention is intended to include all modifications in the sense and scope equivalent to the claims. [Explanation of Symbols]

[0088] 1 packaging bag 11 One edge of the packaging bag 12. The other edge of the packaging bag 13. The Gazette 14 Opening 15 Back panel 2. First sheet material 20 First sheet piece 201A One side edge of the first sheet piece 201B Other side edge of the first sheet piece 201B1 Other end of the first sheet piece 202 One edge of the first sheet piece 203 Other edge of the first sheet piece 21 Side edge of the first sheet material 211 Side edge of the first sheet material 22 One end of the first sheet material 23 Other edge of the first sheet material 3. Second sheet material 30 layers of seal 31 Side edge of the second sheet material 32 One end of the second sheet material 33 Other edge of the second sheet material 34 Polymerization section 4. The pinch 5. Information display section H1 First seal area H2 Second Seal Area H21 First Overlap Region H22 Second Dual Region H23 Third Overlap Region H24 Fourth Overlap Region H25 Fifth Overlap Region X Food

Claims

1. It is formed into a bag shape using a packaging material made of sheet material, The aforementioned sheet material comprises a first sheet material and a second sheet material that overlaps with the first sheet material. The first sheet material is folded back at both ends in the width direction, The second sheet material has a pair of overlapping portions along its longitudinal direction, where one side edge or its vicinity overlaps with one side edge of the first sheet material, and the other side edge or its vicinity overlaps with the other side edge of the first sheet material. A pair of first sealing regions are formed, in which the pair of overlapping portions and the pair of side edges of the first sheet material are sealed along the longitudinal direction from one end to the other of the first sheet material and the second sheet material. At least one end of the first sheet material and the second sheet material in the longitudinal direction, one or a pair of second sealing regions are formed, in which the first sheet material and the second sheet material are sealed over the entire width direction. The second sheet material has a tab formed on it. A packaging bag in which the tab portion is fixed on three sides by a pair of first sealing regions and one second sealing region, or by one first sealing region and a pair of second sealing regions.

2. The packaging bag according to claim 1, wherein in the second sealing region, the sealing strength between the first sheet material and the second sheet material is weaker than the sealing strength between the first sheet materials themselves.

3. The packaging bag according to claim 1 or 2, wherein a weak seal layer is formed on the side of the second sheet material that overlaps with the first sheet material.

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