Packaging bags and packaging bodies

Abstract

The present invention aims to provide a packaging bag and packaging body that have excellent strength in the handle portion and suppress unintended opening of the handle hole. [Solution] The present invention relates to a packaging bag made of film, comprising: a main body having a storage space for accommodating an object to be packaged; a handle provided on the upper end side of the main body having a gusseted portion and a non-gusseted portion; and a group of slits provided on the handle, including a plurality of spaced-apart slits and temporary fastening portions formed between the slits, wherein a handle hole is formed by breaking the temporary fastening portions, the group of slits having a pair of slits extending in the left-right direction, the slits having a straight portion and a curved portion, the straight portion and the curved portion being continuous, and the length from the upper end of the handle to the upper end of the group of slits being 65% or more when the vertical length of the handle is taken as 100%.

Description

Technical Field

[0001] The present invention relates to a packaging bag and a package. Specifically, the present invention relates to a film packaging bag for packaging an object to be packaged typified by roll products such as toilet paper and kitchen paper, and a package in which a roll product is accommodated in the packaging bag.

Background Art

[0002] Conventionally, as a packaging bag for toilet rolls and the like, a resin tubular film is symmetrically folded on both left and right sides to form a main body, and the upper part of the main body is folded flat to form a handle part (for example, Patent Documents 1 to 4). It is common to form a slit in the handle part of such a packaging bag to form a handle hole for inserting a finger.

[0003] There are known forms in which two handle holes are provided in the handle part and forms in which one handle hole is provided. In the packaging bag provided with two handle holes, when carrying the toilet roll or the like in a stored state, there was a problem such as finger pain. For this reason, the development of a packaging bag provided with one handle hole has been studied. For example, Patent Documents 3 and 4 disclose a packaging bag in which a slit group including a plurality of slits and a temporary fixing part is formed in the handle part. Here, one handle hole is formed by breaking the temporary fixing part.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

[0005] However, in the packaging bags with slits disclosed in Patent Documents 3 and 4, the strength of the handle portion is insufficient when the weight of the packaged item is heavy, and improvement is needed.

[0006] Furthermore, in the packaging bag having a slit disclosed in Patent Document 1, for example, when the film is transported before packaging during the manufacturing process, there is a possibility that the handle hole may be unintentionally opened. If the handle hole is opened, there is a risk of distortion occurring when cutting the upper part of the handle hole, so it has been desirable to suppress the opening of the handle hole.

[0007] Therefore, in order to solve the problems of the prior art, the inventors of this invention proceeded with research with the aim of providing a packaging bag and packaging body that have excellent strength in the handle portion and suppress the unintended opening of the handle hole. [Means for solving the problem]

[0008] Specifically, the present invention has the following configuration.

[0009] [1] A main body having a storage space for accommodating the items to be packaged, A handle portion is provided on the upper end of the main body, and has a gusseted portion and a non-gusseted portion. It has a group of slits provided in the handle, which includes a plurality of spaced-apart slits and temporary fastening portions formed between the slits, A film packaging bag in which a handle hole is formed by breaking the temporary fastening portion, The slit group has a pair of slits extending in the left-right direction, and the slits have a straight section and a curved section, with the straight section and the curved section being continuous. A packaging bag in which, when the vertical length of the handle is taken as 100%, the length from the top end of the handle to the top end of the slit group is 65% or more. [2] The packaging bag according to [1], wherein the left and right ends of the slit group are arc-shaped. [3] The packaging bag according to [2], wherein the left and right ends of the slit group are facing downward. [4] The packaging bag according to [2] or [3], wherein the arc radius of the left and right ends of the slit group is 5 to 15 mm. [5] A packaging bag as described in any of [1] to [4], wherein the length from the top of the slit group to the top of the handle is 30 mm or more. [6] A packaging bag as described in any of [1] to [5], wherein the vertical length of the slit group is 20% or less when the vertical length of the handle is taken as 100%. [7] A packaging bag according to any one of [1] to [6], wherein the handle portion has a heat-seal portion extending in the left-right direction, and the length from the upper end of the slit group to the upper end of the heat-seal portion is 20 mm or more. [8] The packaging bag according to any one of [1] to [7], wherein the slit group has a roughly V-shaped slit with the apex at the bottom in the vertical direction of the handle. [9] The packaging bag according to any one of [1] to [8], wherein the slit group has vertically extending linear dividing slits or perforations at positions spaced apart vertically downward from the apex of the substantially V-shaped slit.

[10] A packaging bag according to any one of [1] to [9], wherein a group of slits is provided in the non-gusset portion.

[11] A packaging bag as described in any of [1] to

[10] , wherein the handle portion is laminated with a reinforcing film.

[12] A package containing the items to be packaged in a packaging bag as described in any of [1] to

[11] .

[13] The packaging described in

[12] , wherein the weight of the contents to be packaged is 1.2 kg or more. [Effects of the Invention]

[0010] According to the present invention, it is possible to obtain a packaging bag and packaging body that have excellent strength in the handle portion and suppress unintended opening of the handle hole. [Brief explanation of the drawing]

[0011] [Figure 1]FIG. 1 is a perspective view showing an example of a packaging bag containing a toilet roll. [Figure 2] FIG. 2 is a plan view showing a state where the object to be packaged is not contained in the packaging bag. [Figure 3] FIG. 3 is a cross-sectional view of the packaging bag. [Figure 4] FIG. 4 is a perspective view showing an example of a packaging bag containing a toilet roll. [Figure 5] FIG. 5 is a plan view showing a state where the object to be packaged is not contained in the packaging bag. [Figure 6] FIG. 6 is a cross-sectional view of the packaging bag. [Figure 7] FIG. 7 is a schematic view of a slit group formed in the handle portion of the packaging bag. [Figure 8] FIG. 8 is a schematic view of a slit group formed in the handle portion of the packaging bag. [Figure 9] FIG. 9 is a schematic view of a slit group formed in the handle portion of the packaging bag of the comparative example. [Figure 10] FIG. 10 is a schematic view of a slit group formed in the handle portion of the packaging bag of the comparative example. [Figure 11] FIG. 11 is a schematic view of a slit group formed in the handle portion of the packaging bag of the comparative example. [Figure 12] FIG. 12 is a schematic view of a slit group formed in the handle portion of the packaging bag of the comparative example. [Figure 13] FIG. 13 is a plan view showing a state where the object to be packaged is not contained in the packaging bag and a cross-sectional view of the packaging bag.

MODE FOR CARRYING OUT THE INVENTION

[0012] The present invention will be described in detail below. The following descriptions of constituent elements may be based on representative embodiments or specific examples, but the present invention is not limited to such embodiments. Furthermore, in order to illustrate the content of the present invention, embodiments of the present invention may be described with reference to the drawings, but the present invention is not limited to the embodiments shown in the drawings and includes modifications and improvements that will be obvious to those skilled in the art based on the matters described herein.

[0013] (packaging bag) The present invention relates to a packaging bag for containing an object to be packaged. The packaging bag of the present invention is a film packaging bag having a main body having a storage space for containing an object to be packaged, a handle portion provided on the upper end side of the main body having a gusset portion and a non-gusset portion, and a group of slits provided on the handle portion, including a plurality of spaced-apart slits and temporary fastening portions formed between the slits, wherein a handle hole is formed by breaking the temporary fastening portions. In the packaging bag of the present invention, the group of slits has a pair of slits extending in the left-right direction, and the slits have a straight portion and a curved portion, and the straight portion and the curved portion are continuous. Furthermore, in the packaging bag of the present invention, if the vertical length of the handle portion is taken as 100%, the length from the upper end of the handle portion to the upper end of the group of slits is 65% or more.

[0014] Conventionally, the handle portion was formed from a soft material. In this case, when the temporary fastening portion was broken and fingers were inserted to hold the bag, if the packaged product was heavy, it could tear starting from the temporary fastening portion, making it difficult to prevent the handle hole from opening and to increase the strength of the handle portion. On the other hand, the packaging bag of the present invention has the above-mentioned structure, so the strength of the handle portion is excellent and the unintended opening of the handle hole is suppressed. Thus, the packaging bag of the present invention has excellent strength in the handle portion and the unintended opening of the handle hole during manufacturing is suppressed, so distortion of the handle portion is suppressed, and as a result, even when the packaged product is heavy, the stretching of the handle hole or the tearing of the handle portion is suppressed. For this reason, the packaging bag of the present invention can be preferably used for packaging products such as 18 rolls (6 rolls x 3 layers) or long rolls of 12 rolls (3 rolls x 3 layers).

[0015] Figures 1 and 4 show a packaging bag 100 according to the present invention containing multiple rolls of toilet paper (toilet rolls). As shown in Figures 1 and 4, the packaging bag 100 has a main body portion 10 having a storage space for the items to be packaged, a handle portion 20 provided on the upper end side of the main body portion 10 and having a gusset portion and a non-gusset portion, and a group of slits 30 provided on the handle portion, including a pair of slits that are spaced apart from each other and extend in the left-right direction, and a temporary fastening portion formed between the slits. In the packaging bag 100, a handle hole 40 is formed by breaking the temporary fastening portion.

[0016] In the example shown in Figure 1, the packaging bag 100 contains a total of 12 toilet rolls, arranged in a planar fashion with 4 rolls placed side by side and 3 stacked vertically. However, the number of toilet rolls that can be contained in the packaging bag 100 is not limited to this, and could be, for example, 4, 6, 8, 16, or 18. In this embodiment, as shown in Figure 4, the packaging bag 100 may contain a total of 18 toilet rolls, arranged in a planar fashion with 6 rolls placed side by side and 3 stacked vertically. In addition to toilet rolls, the packaging bag 100 can also contain products such as rolls of kitchen paper (kitchen rolls) and disposable diapers. In this specification, articles that can be contained in the packaging bag 100 are referred to as "packaged items".

[0017] Figure 2 is a plan view of the packaging bag 100 in the configuration of Figure 1, showing the state in which the packaging bag does not contain any items to be packaged. Similarly, Figure 5 is a plan view of the packaging bag 100 in the configuration of Figure 4, showing the state in which the packaging bag does not contain any items to be packaged. Here, in this specification, "vertical direction" means the vertical direction when the handle is at the top. Also, "horizontal direction" means the direction perpendicular to the vertical direction in a planar manner when the packaging bag is folded flat, as shown in Figures 2 and 5. In Figures 2 and 5, the "vertical direction" is shown on the Y axis and the "horizontal direction" is shown on the X axis.

[0018] Figure 3 is a cross-sectional view of the packaging bag 100 in the embodiment shown in Figure 1. Figure 3 is a cross-sectional view of the packaging bag 100 along line A-A' in Figure 2. Figure 6 is a cross-sectional view of the packaging bag 100 in the embodiment shown in Figure 4. Figure 6 is a cross-sectional view of the packaging bag 100 along line B-B' in Figure 5. As shown in Figures 3 and 6, the packaging bag 100 is basically composed of a tubular main film 15. In the examples shown in Figures 3 and 6, both sides of the tubular main film 15 are folded inward in the left-right direction to form a symmetrical gusset. The gusset is a structure in which the film is folded such that a mountain fold portion 11, a valley fold portion 12, and another mountain fold portion 11 are formed in this order in the thickness direction of the packaging bag 100. The valley fold portions 12 of the gussets on both the left and right sides are arranged to abut each other near the left-right center of the packaging bag 100 at a certain distance apart. In Figures 3 and 6, the gusseted portion is denoted as G and the non-gusseted portion as nG, and the length of the handle portion in the left-right direction can also be expressed as the length of G + the length of nG + the length of G. As shown in Figure 6, in the present invention, it is also a preferred embodiment that a group of slits 30 is formed in the non-gusseted portion (nG).

[0019] As shown in Figures 2 and 5, a heat-sealed section 60 is formed above the main film 15 that constitutes the packaging bag 100, by heat-sealing multiple overlapping film layers. In other words, the top of the main film 15 is sealed by the heat-sealed section 60. After sealing the top of the main film 15 with the heat-sealed section 60, the items to be packaged are placed inside the packaging bag 100, and then the bottom of the film is sealed with adhesive or by heat-sealing, thereby housing the items inside the packaging bag 100.

[0020] As shown in Figures 2 and 5, the packaging bag 100 has a main body 10 with a storage space for the items to be packaged, and a handle 20 provided at the upper end of the main body 10. In other words, the handle 20 is a part where the film layers, which are laminated in the thickness direction, are joined flat by forming a heat-sealed portion 60 on a cylindrical film. This handle 20 is grasped by hand when transporting the packaging bag 100 containing the items to be packaged. In contrast, the main body 10 basically does not have a heat-sealed portion 60 formed thereon, and it is possible to pack the items to be packaged into its internal space from the open lower part opposite the handle 20.

[0021] Furthermore, as shown in Figures 2 and 5, a reinforcing film 50 may be laminated onto the handle portion 20. The reinforcing film 50 is further laminated onto the multiple film layers that make up the handle portion 20, reinforcing the handle portion 20 and more effectively preventing damage or tearing of the handle portion 20 during transport.

[0022] The reinforcing film 50 has a length in the left-right direction that is shorter than the length of the handle portion 20 in the left-right direction. For example, the length of the reinforcing film 50 in the left-right direction is preferably 30% to 70% of the length of the handle portion 20 in the left-right direction. The reinforcing film 50 is bonded to the center of the handle portion 20 in the left-right direction. Therefore, there are areas on both the left and right sides of the handle portion 20 where the reinforcing film 50 does not overlap. Furthermore, the length of the reinforcing film 50 in the upper-upper direction is preferably 50% to 95% of the length of the handle portion 20 in the vertical direction. Therefore, there are areas on the upper and lower ends of the handle portion 20 where the reinforcing film 50 does not overlap.

[0023] The reinforcing film 50 may be bonded to either the front or back side, or both, of the handle portion 20, and it is preferable that it is bonded to either the front or back side. A portion of the reinforcing film 50 is fusion-bonded to the handle portion 20 and heat-sealed at the heat-seal portion 60. The reinforcing film 50 is selected from a material that has heat-meltable properties, similar to the main body film 15 that constitutes the handle portion 20, but it may be the same type as the film that constitutes the handle portion 20, etc., or it may be a different type.

[0024] As shown in Figures 3 and 6, for example, if one reinforcing film 50 is attached to the back of the handle portion 20, then in the gusseted portion G where the gusset is formed, there will be five layers of film including the reinforcing film 50, and in the non-gusseted portion nG between the valley folds 12 of the left and right gussets G, there will be three layers of film including the reinforcing film 50. Furthermore, in the gusseted portions G on both the left and right sides where the reinforcing film 50 is not present, there will be four layers of film.

[0025] Figures 2 and 5 show an example of a heat-sealed portion 60 formed by heat-sealing a film. In this embodiment, the heat-sealed portion 60 includes a plurality of linear vertical seal lines 61 extending along the vertical direction (Y-axis direction) and a plurality of linear horizontal seal lines 62 extending along the horizontal direction (X-axis direction). Each of the plurality of vertical seal lines 61 and the plurality of horizontal seal lines 62 heat-seals the laminated main body film 15 and the reinforcing film 50 that form the handle portion 20. The width of each seal line 61 and 62 is not particularly limited, but can be, for example, 2 mm or more and 5 mm or less.

[0026] The multiple transverse seal lines 62 include a first transverse seal line 62a and a second transverse seal line 62b that extend from the left end to the right end over almost the entire left-right area of ​​the handle portion 20. The first and second transverse seal lines 62a and 62b are formed so as to straddle the reinforcing film 50 and pass near the upper and lower edges of the reinforcing film 50. Preferably, the first and second transverse seal lines 62a and 62b have intermittent sections 63 in the left and right regions where the reinforcing film 50 does not overlap, in which the main body film 15 is not partially heat-sealed. The intermittent section 63 of the first transverse seal line 62a and the intermittent section 63 of the second transverse seal line 62b are located almost in a straight line when viewed in the vertical direction. Furthermore, in the left and right regions where the reinforcing film 50 does not overlap, there are no vertical seal lines connecting the first transverse seal line 62a and the second transverse seal line 62b, nor any other heat-sealed areas. Therefore, the areas where these intermittent sections 63 are provided function as air holes that allow outside air to pass into the main body 10 of the packaging bag 100. By providing air holes in the handle portion 20 in this way, air inside the main body 10 can be released to the outside. Therefore, even if pressure is applied to the main body 10, it is possible to prevent the internal air pressure from increasing and to avoid the main body 10 or other parts from bursting.

[0027] Furthermore, as shown in Figures 2 and 5, in the region where the reinforcing film 50 overlaps, a first vertical seal line 61a and a second vertical seal line 61b extending in the vertical direction are formed between the first and second horizontal seal lines 62a and 62b. By providing seal lines, the main film 15 and the reinforcing film 50 are joined by heat fusion, thereby increasing their strength. As a result, when a handle hole is formed during use, it is possible to suppress the handle hole from unintentionally stretching or tearing. The first and second vertical seal lines 61a and 61b are formed near the left and right edges of the reinforcing film 50. Since the first and second vertical seal lines 61a and 61b intersect with the first and second horizontal seal lines 62a and 62, these four seal lines define a substantially rectangular region. The slit group 30 is then formed within this substantially rectangular region. In other words, in the present invention, the heat-sealed portion has two or more vertical seal lines 61 extending in the vertical direction of the handle portion and two or more horizontal seal lines 62 extending in the left-right direction of the handle portion, and the slit group 30 is located in the area surrounded by the vertical seal lines 61 and the horizontal seal lines 62. By providing the slit group 30 in the area surrounded by the vertical seal lines 61 and the horizontal seal lines 62 in this way, it is possible to suppress damage to the handle portion 20 even if a certain degree of strong tensile force or twisting is applied to the handle portion 20 when forming the handle hole 40.

[0028] Furthermore, in the region where the reinforcing film 50 overlaps, a third transverse seal line 62c and a fourth transverse seal line 62d extending in the left-right direction may be formed between the first and second longitudinal seal lines 61a and 61b. In this case, the third and fourth transverse seal lines 62c and 62d are biased towards the upper part (towards the first transverse seal line 62a) of the substantially rectangular region formed by the first and second longitudinal seal lines 61a and 61b and the first and second transverse seal lines 62a and 62b. Therefore, a substantially rectangular region with a relatively small area is defined by the four seal lines: the first and second longitudinal seal lines 61a and 61b and the second and fourth transverse seal lines 62b and 62d. In the packaging bag 100 of the present invention, it is preferable that the slit group 30 is formed within the rectangular region defined by these four seal lines 61a, 61b, 62b, and 62d.

[0029] In this embodiment, fifth and sixth lateral seal lines (not shown) may be provided as needed. In this case, the fifth and sixth lateral seal lines are provided below the fourth lateral seal line 62d.

[0030] In this embodiment, the length of the lateral seal line 62 extending along the left-right direction (X-axis direction), from the upper end of the lateral seal line 62a formed at the uppermost part of the handle portion 20 to the upper end of the slit group described later, is preferably 25 mm or more, more preferably 30 mm or more, and even more preferably 35 mm or more. By setting the length from the upper end of the lateral seal line 62a to the upper end of the slit group described later within the above range, the strength of the handle portion 20 can be increased, and as a result, even when the weight of the packaged object is heavy, it is possible to suppress the stretching and enlargement of the handle hole 40 or the breakage of the handle portion 20.

[0031] The slit group 30 includes a plurality of spaced-apart slits 31 for forming handle holes 40 in the handle portion 20 of the packaging bag 100, and temporary fastening portions 32 located between each slit 31 that are broken when forming the handle holes 40. Each slit 31 penetrates the handle portion 20 in the thickness direction. Furthermore, if a reinforcing film 50 is laminated, it is preferable that each slit 31 penetrates the handle portion 20 and the reinforcing film 50 in the thickness direction.

[0032] In this embodiment, when the temporary fastening portion 32 is broken, the film portion surrounded by the slit 31 unfolds in a flap shape to form a handle hole 40, and this film portion remains connected to the handle portion 20.

[0033] The slit group 30 has a pair of slits extending in the left-right direction, and each slit has a straight section and a curved section, with the straight section and curved section being continuous. Here, the straight section consists of a straight slit 31b extending parallel to the left-right direction, and the curved section consists of an arc-shaped slit 31a at the ends in the left-right direction. In this embodiment, the starting point (end) of the arc that constitutes the arc shape becomes the boundary point between the straight section and the curved section, and the temporary fastening section 32 is not formed in this boundary region. As a result, the straight section and curved section are continuous.

[0034] A gap is provided between the pair of slits extending in the left-right direction that constitute the slit group 30, and this gap functions as a temporary fastening portion 32. In this embodiment, it is preferable that the temporary fastening portion 32 is provided in the center in the left-right direction, and that the pair of slits are symmetrical with respect to the temporary fastening portion 32. This forms a handle hole 40 with a symmetrical shape. If the handle hole is unintentionally opened when manufacturing the packaging, the width of the temporary fastening portion 32 can be increased. If widening the temporary fastening portion 32 makes it difficult to form the handle hole, the temporary fastening portion can be made into a dashed line to maintain ease of opening.

[0035] The number of temporary fastening portions 32 in the slit group 30 is not particularly limited, but it is preferable to have 5 or fewer, and it is even more preferable that one temporary fastening portion 32 is provided in the left-right central part of the handle portion 20. In this specification, the left-right central part of the handle portion 20 refers to the area that extends 10% to the left and right from the left-right center line of the handle portion 20. The above value (%) represents the ratio of the length of the area to the total length of the handle portion 20 in the left-right direction. The temporary fastening portion is preferably located in an area within 25% to the left and right from the left-right center line of the slit group 30, more preferably within 20% to the left and right, and particularly preferably within 15% to the left and right. Here, the above area indicates the position relative to the length of the slit (length A in Figure 11) in the left-right direction (X-axis direction) from the center line CL. For example, in the case of Figure 11, the length of the slit is 40 mm, and the length to the temporary fastening portion (length B in Figure 11) is 35 mm. Therefore, the temporary fastening portion is located in the 75% area from the center line. By forming the temporary fastening portion within this range, it is positioned inside the handle hole, which reduces the load on the film and thus minimizes its impact.

[0036] In this embodiment, the temporary fastening portion 32 may be provided in other regions in addition to the central region described above. For example, the temporary fastening portion 32 may be provided so as to divide the arc-shaped slit 31a. In this case, it is preferable that the temporary fastening portion 32 is provided in the lower half of the arc-shaped slit 31a in the vertical direction. However, it is preferable that the arc-shaped slit 31a and the straight slit 31b are continuous, and that the temporary fastening portion 32 does not exist between the arc-shaped slit 31a and the straight slit 31b. When the temporary fastening portion 32 is formed in the above range, it will be formed below the straight portion of the slit, so the distance from the upper end of the handle portion will be large, making it less likely to cause breakage when transporting using the handle portion, and forming it in the lower half of the arc-shaped slit makes it easier to further suppress breakage.

[0037] When the vertical length of the handle portion 20 is taken as 100%, the length from the upper end of the handle portion 20 to the upper end of the slit group 30 should be 65% or more, preferably 68% or more, and more preferably 70% or more. Furthermore, in order to secure the area for forming the handle hole 40, the length from the upper end of the handle portion 20 to the upper end of the slit group 30 should be 85% or less, and more preferably 80% or less. By making the length from the upper end of the handle portion 20 to the upper end of the slit group 30 equal to or greater than the above lower limit, the strength of the handle portion 20 can be increased, and as a result, even when the weight of the packaged object is heavy, it is possible to suppress the stretching and enlargement of the handle hole 40 or the breakage of the handle portion 20.

[0038] Specifically, the length from the upper end of the handle portion 20 to the upper end of the slit group 30 is preferably 35 mm or more, more preferably 40 mm or more, and particularly preferably 45 mm or more. Furthermore, in order to secure the area for forming the handle hole 40, the length from the lower end of the handle portion 20 to the upper end of the slit group 30 is preferably 30 mm or less, more preferably 25 mm or less, and even more preferably 20 mm or less. By making the length from the upper end of the handle portion 20 to the upper end of the slit group 30 equal to or greater than the above lower limit, the strength of the handle portion 20 can be increased, and as a result, even when the weight of the packaged object is heavy, it is possible to suppress the handle hole 40 from stretching and expanding excessively or the handle portion 20 from breaking.

[0039] A pair of slits extending in the left-right direction have a straight section 31b and a curved section 31a, with the straight section 31b and the curved section 31a being continuous. That is, the left-right ends of the slit group are curved sections, preferably in the shape of an arc. Furthermore, it is preferable that the ends of this arc face downwards. In other words, it is preferable that the left and right ends (open ends) of a pair of slits extending in the left-right direction face downwards.

[0040] When the left and right ends of a pair of slits are arc-shaped, the shape of the arc is particularly preferably a sector with a central angle of 60 to 100°. Furthermore, the radius of the arc (sector) is preferably 3 mm or more, and more preferably 5 mm or more. By setting the radius of the arc (sector) to be above the lower limit mentioned above, it is possible to suppress the concentration of force at the intersection of the curved and straight sections, thereby preventing it from triggering a break. In particular, by setting the radius to 5 mm or more, the force is applied gradually from the intersection of the curved and straight sections, distributing to the curved section, making it less likely to trigger a break at the intersection. Furthermore, the radius of the arc (sector) is preferably 25 mm or less, more preferably 20 mm or less, and even more preferably 15 mm or less.

[0041] When the vertical length of the handle portion 20 is set to 100%, the vertical length of the slit group 30 is preferably 20% or less, and more preferably 15% or less. Furthermore, from the viewpoint of ensuring the size of the handle hole 40, the vertical length of the slit group 30 is preferably 5% or more. By keeping the vertical length of the slit group 30 within the above range, the strength of the handle portion 20 can be increased, and as a result, even when the weight of the packaged object is heavy, it is possible to suppress the stretching and enlargement of the handle hole 40 or the breakage of the handle portion 20.

[0042] In this embodiment, the slit group 30 may have a substantially V-shaped slit 31c whose apex is located below the handle portion 20 in the vertical direction. Here, "substantially V-shaped slit" means a slit in which the two linear slits constituting it are connected or separated at the apex of the V shape. In the example shown in Figure 7, the two linear slits that make up the substantially V-shaped slit 31c are separated at the part corresponding to the apex of the V shape. Note that the two linear slits that make up the substantially V-shaped slit 31c may be connected.

[0043] The roughly V-shaped slit 31c is preferably located in the center of the handle portion 20 in the left-right direction. Therefore, when attempting to grip the handle portion 20, the middle and index fingers of the user's hand are easily inserted into the roughly V-shaped slit 31c. By providing the roughly V-shaped slit 31c approximately in the center of the handle portion 20 in this way, it becomes easier to insert fingers into the group of slits 30. Furthermore, when fingertips are inserted into the group of slits 30, the roughly V-shaped slit 31c opens first, and then the temporary fastening portion 32 surrounding it breaks. As a result, the handle hole 40 can be easily formed even with one hand.

[0044] The roughly V-shaped slit 31c may be connected to a pair of slits extending in the left-right direction, or it may be formed at a position 1 mm to 8 mm away from these slits.

[0045] Furthermore, as shown in Figure 7, a straight dividing slit 31d extending in the vertical direction may be formed at a position spaced downward in the vertical direction from the apex of the roughly V-shaped slit 31c. This dividing slit 31d can also be replaced with a perforation. In this way, the dividing slit 31d has the function of opening the main body 10 by dividing the film portion between the pair of slits into left and right halves after the temporary fastening portion 32 between it and the roughly V-shaped slit 31c breaks, and further extending the dividing line to the main body 10. This makes it easy to remove the packaged items contained in the main body 10. Thus, the dividing slit 31d functions as an opening line for the main body.

[0046] As shown in Figures 2 and 5, the roughly V-shaped slit 31c and the dividing slit 31d are located in the center of the handle portion 20 in the left-right direction. Therefore, at least the roughly V-shaped slit 31c and the dividing slit 31d are formed in the non-gusset portion where the number of film layers is reduced. By forming the roughly V-shaped slit 31c and the dividing slit 31d in the non-gusset portion where the number of film layers is reduced in the center of the handle portion 20 in this way, it becomes easier to insert fingers into the roughly V-shaped slit 31c. In addition, the dividing slit 31d can be easily broken, and the opening line extending from the dividing slit 31d can easily reach the main body portion 10. As a result, the formation of the handle hole 40 becomes easier, and furthermore, the insertion of fingers into the roughly V-shaped slit 31c makes it easier to break the dividing slit 31d, making it easier to open the main body portion 10.

[0047] As the main film 15 constituting the packaging bag 100, a known film with heat meltability can be used. Examples include polyethylene films such as HDPE (high-density polyethylene) film, LDPE (low-density polyethylene) film, and LLDPE (linear low-density polyethylene) film, polystyrene film, polypropylene film, or laminated films thereof. A similar known film can also be used as the reinforcing film 50. In particular, the main film 15 is preferably a polyethylene film such as HDPE (high-density polyethylene) film, LDPE (low-density polyethylene) film, and LLDPE (linear low-density polyethylene) film, or a polypropylene film such as CPP (unoriented polypropylene), and more preferably an LDPE (low-density polyethylene) film. Similarly, the reinforcing film 50 is preferably a polyethylene film such as HDPE (high-density polyethylene) film, LDPE (low-density polyethylene) film, and more preferably an LLDPE (linear low-density polyethylene) film. Furthermore, the main film 15 may contain biomass raw materials, for example, a polyolefin film formed from biomass raw materials.

[0048] The thickness of the main film 15 is preferably 20 μm or more, more preferably 22 μm or more, and even more preferably 25 μm or more. Furthermore, the thickness of the main film 15 is preferably 70 μm or less, and more preferably 65 μm or less. By setting the thickness of the main film 15 to be above the lower limit, the strength of the handle portion 20 can be effectively increased. Furthermore, by setting the thickness of the main film 15 to be below the upper limit, the stiffness of the packaging film can be softened.

[0049] The thickness of the reinforcing film 50 is not particularly limited, but is preferably 50 to 120 μm and can be appropriately selected according to the weight of the product. If the strength of the main film 15 is insufficient, it is preferable to place the reinforcing film 50, and it is preferable to select a thickness that compensates for the strength of the main film 15.

[0050] The packaging bag of the present invention has excellent strength in the handle portion and suppresses unintended opening of the handle hole, so even when the weight of the packaged item is heavy, the handle hole will not stretch and the handle portion will not break. For this reason, the packaging bag of the present invention can be preferably used for packaging products such as 18 rolls (6 rolls x 3 layers) or 12 rolls (3 rolls x 3 layers) of long rolls. When the packaging bag of the present invention is used for packaging a product containing 18 rolls (6 rolls x 3 layers), the arrangement of rolls within the packaging is such that the width direction > depth direction, so the length of the handle portion in the left-right direction becomes larger than the gusset portion (G+G), and the width of the non-gusset portion (nG) in the handle portion becomes larger in the left-right direction. In such an embodiment, the slit group will be formed in the non-gusset portion.

[0051] In the central region of the handle portion 20, the bag cross-sectional area above the upper end of the slit group 30 is 4.5 mm². 2 Preferably, the above is true. Also, in the central region of the handle portion 20, the bag cross-sectional area above the upper end of the slit group 30 is 7.5 mm². 2The following is preferable. Here, the bag cross-sectional area above the upper end of the slit group is the sum of the cross-sectional area other than the reinforcing film above the upper end of the slit (hereinafter also referred to as cross-sectional area A) and the cross-sectional area of ​​the reinforcing film above the upper end of the slit (hereinafter also referred to as cross-sectional area B). More specifically, it is calculated as film thickness (mm) × length from the upper end of the slit group to the upper end of the handle × number of layers + reinforcing film thickness (mm) × length from the upper end of the slit group to the upper end of the reinforcing film. Note that if the width of the non-gusseted portion in the handle is large in the left-right direction, the bag cross-sectional area (cross-sectional area A + B) near the central region of the handle 20 will be the cross-sectional area of ​​two film layers and the reinforcing film. If the width of the non-gusseted portion in the handle is small in the left-right direction, the bag cross-sectional area (cross-sectional area A + B) near the central region of the handle 20 will be the cross-sectional area of ​​four film layers and the reinforcing film. By keeping the bag cross-sectional area (cross-sectional area A+B) above the upper end of the slit group 30 within the above range, the strength of the handle portion 20 can be increased. As a result, even when the weight of the packaged item is heavy, it is possible to prevent the handle holes 40 from stretching and expanding, or the handle portion 20 from breaking.

[0052] Here, in Figure 13(a), the upper end of the slit group 30 is indicated by P. Figure 13(b) is a cross-sectional view of the handle portion 20 along the line C-C' in Figure 13(a). The cross-sectional area of ​​the slit group 30 above the upper end P corresponds to the sum of the cross-sectional area of ​​the part above the upper end P of the slits other than the reinforcing film (cross-sectional area A) and the cross-sectional area of ​​the reinforcing film above the upper end P of the slits (cross-sectional area B).

[0053] (packaging) The present invention may also relate to a package in which an object to be packaged is contained in a packaging bag. Examples of objects to be packaged include toilet paper, rolls of kitchen paper (kitchen rolls), and disposable diapers. In particular, the packaging bag of the present invention has excellent strength in the handle portion and suppresses unintended opening of the handle hole, so even if the weight of the object to be packaged is heavy, the handle hole will not stretch or the handle portion will not break. For this reason, the weight of the object to be packaged may be 0.5 kg or more, 1.0 kg or more, 1.2 kg or more, 1.5 kg or more, or 2.0 kg or more. Furthermore, there is no particular upper limit to the weight of the object to be packaged, but for example, it may be set to an upper limit of about 6.0 kg. Because the present invention has the above configuration, even when an object to be packaged weighing about 6.0 kg is contained, it is possible to suppress the stretching of the handle hole or the breakage of the handle portion when carrying it.

[0054] In particular, the packaging of the present invention is preferably a packaging that contains, for example, a roll-shaped product containing 18 rolls (6 rolls x 3 layers) or a roll-shaped product containing 12 long rolls (3 rolls x 3 layers), and is especially preferably a roll-shaped product containing 18 rolls (6 rolls x 3 layers).

[0055] In this embodiment, the judgment value calculated by the following formula is preferably 15 or higher, more preferably 17 or higher, and even more preferably 19 or higher. Furthermore, the judgment value calculated by the following formula is preferably 30 or lower from the viewpoint of suppressing over-quality and cost increases. Formula: Judgment value = Cross-sectional area 2 / weight 1 / 2 However, the cross-sectional area is the cross-sectional area in the thickness direction 30% inward from the left and right ends of the handle (i.e., the cross-sectional area of ​​the bag above the top of the slit group), and is calculated as film thickness (mm) × length from the top of the slit group to the top of the handle × number of layers + reinforcing film thickness (mm) × length from the top of the slit group to the top of the reinforcing film, and the weight is calculated as roll weight (including core) × number of rolls.

[0056] By keeping the above judgment values ​​within a predetermined range, it becomes possible to select a film with appropriate handle strength and thickness depending on the item being packaged, and to manufacture packaging bags with strong handles at a lower cost. Furthermore, by appropriately controlling the thickness of the packaging bags, the environmental impact can also be reduced. [Examples]

[0057] The features of the present invention will be further described below with reference to examples and comparative examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be interpreted as being limited by the following specific examples.

[0058] (Example 1) A cylindrical main body film with a thickness of 25 μm and a printed inner surface (a mixed resin film of LDPE (low-density polyethylene) and LLDPE (linear low-density polyethylene) with a circumference of 800 mm) had gussets symmetrically folded into both the left and right sides. At this time, the bag width (length in the left-right direction of the handle) was 206 mm, and the width of each gusset was 97 mm. Next, a group of slits 30 was formed to achieve the shape shown in Figure 7.

[0059] (Examples 2-5) Packaging bags were manufactured in the same manner as in Example 1, except that each condition was changed to match the conditions listed in Table 1. The shape of the slit groups was the same as in Example 1.

[0060] (Example 6) A cylindrical main body film with a thickness of 35 μm and a printed inner surface (a mixed resin film of LDPE (low-density polyethylene) and LLDPE (linear low-density polyethylene) with a circumference of 1000 mm) had gussets symmetrically folded into both the left and right sides. In this process, the bag width was 306 mm, and the width of each gusset was 97 mm.

[0061] (Examples 7-12) Packaging bags were manufactured in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1. The shape of the slit groups was the same as in Example 6.

[0062] (Example 13) A packaging bag was manufactured in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1, and the shape of the slit was changed to match that shown in Figure 8.

[0063] (Comparative Example 1) Packaging bags were prepared in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1. The shape of the slit groups was the same as in Example 1.

[0064] (Comparative Example 2) Packaging bags were manufactured in the same manner as in Example 1, except that each condition was changed to match the conditions listed in Table 1. The shape of the slit groups was the same as in Example 1.

[0065] (Comparative Example 3) A packaging bag was manufactured in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1, and the shape of the slit was changed to match that shown in Figure 9.

[0066] (Comparative Example 4) A packaging bag was manufactured in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1, and the shape of the slit was changed to match that shown in Figure 10.

[0067] (Comparative Example 5) A packaging bag was manufactured in the same manner as in Example 6, except that each condition was changed to match the conditions listed in Table 1, and the shape of the slit was changed to match that shown in Figure 11.

[0068] (Comparative Example 6) A packaging bag was manufactured in the same manner as in Example 7, except that each condition was changed to match the conditions listed in Table 1, and the shape of the slit was changed to match that shown in Figure 12.

[0069] (Measurement and evaluation) <Strength> (1) Hold the handle and swing it back and forth. (2) The swing angle was set to 45°. (3) The number of swings until the handle broke was counted. ◎: Even after being shaken more than 10 times, the handle does not break and the handle hole does not stretch. ○: Even after shaking it more than 10 times, the handle does not break, but there is significant stretching in the handle hole. △: The handle will break if shaken 5 to 9 times. ×: The handle will break if shaken between 1 and 4 times.

[0070] <Prevention of handle hole opening> Regarding the prevention of the handle opening, those with a temporary fastening part were marked with "◎" and those without were marked with "×".

[0071] <Hardness> Thirty subjects were asked to rate the stiffness of the packaging film of the target product on a 5-point scale, with 35μm film being considered the standard. The evaluation was conducted according to the following criteria, and the average of the 5-point scale was calculated. 5: Soft, 4: Normal, 3: Slightly hard, 2: Hard, 1: Uncomfortably hard ◎: 4.5 or higher ○: 3.0 or higher, less than 4.5 △: 1.5 or higher and less than 3.0 ×: Less than 1.5

[0072] <Ease of opening> Thirty participants were asked to actually open the target product (packaging) and rate it on a 5-point scale using the following criteria: 1 to 5. 5: Easy to open 4: Relatively easy to open 3: Neither 2: Somewhat difficult to open 1: Difficult to open The average of the 5-point scale ratings from 30 subjects was calculated. A score of 4.5 or higher was marked "◎", a score between 3.0 and 4.5 was marked "〇", a score between 1.5 and 3.0 was marked "△", and a score below 1.5 was marked "×".

[0073] [Table 1]

[0074] [Table 2]

[0075] Compared to the comparative example, the embodiment exhibits greater strength in the handle portion and suppresses unintended opening of the handle hole. Furthermore, the embodiment has a softer handle portion, reducing the burden on the hand when carrying it. In addition, the embodiment offers greater ease of opening the packaging bag when removing the toilet roll from the packaging. [Explanation of Symbols]

[0076] 10...Main body 11…Yamaoribe 12…Tanioribe 15…Main unit film 20...Handle part 30... Slit group 31... Slit 31a... Arc-shaped slit 31b...Straight slit 31c... roughly V-shaped slit 31d... Slit for dividing 32... Temporary fastening part 40...Handle hole 50…Reinforcement film 60... Heat seal section 61…Vertical seal line 62... Horizontal seal line 63... Intermittent 100...Packaging bag

Claims

1. A main body having a storage space for accommodating the items to be packaged, A handle portion is provided on the upper end side of the main body portion, having a gusset portion and a non-gusset portion, The handle portion is provided with a group of slits including a plurality of spaced-apart slits and temporary fastening portions formed between the slits, A film packaging bag in which a handle hole is formed by breaking the aforementioned temporary fastening portion, The slit group has a pair of slits extending in the left-right direction, the slits have a straight portion and a curved portion, and the straight portion and the curved portion are continuous. A packaging bag in which, when the vertical length of the handle portion is taken as 100%, the length from the upper end of the handle portion to the upper end of the slit group is 65% or more.

2. The packaging bag according to claim 1, wherein the left and right ends of the group of slits are arc-shaped.

3. The packaging bag according to claim 2, wherein the left and right ends of the slit group are facing downward.

4. The packaging bag according to claim 2, wherein the arc radius of the left and right ends of the slit group is 5 to 15 mm.

5. The packaging bag according to claim 1, wherein the length from the upper end of the slit group to the upper end of the handle portion is 30 mm or more.

6. The packaging bag according to claim 1, wherein, when the vertical length of the handle portion is taken as 100%, the vertical length of the slit group is 20% or less.

7. The packaging bag according to claim 1, wherein the handle portion has a heat-seal portion extending in the left-right direction, and the length from the upper end of the slit group to the upper end of the heat-seal portion is 20 mm or more.

8. The packaging bag according to claim 1, wherein the group of slits has a substantially V-shaped slit with the apex located at the bottom in the vertical direction of the handle portion.

9. The packaging bag according to claim 1, wherein the group of slits has a linear dividing slit or perforation extending in the vertical direction at a position spaced apart downward in the vertical direction from the apex of the substantially V-shaped slit.

10. The packaging bag according to claim 1, wherein the slit group is provided in the non-gusset portion.

11. The packaging bag according to claim 1, wherein a reinforcing film is laminated on the handle portion.

12. A package comprising an object to be packaged contained in a packaging bag according to any one of claims 1 to 11.

13. The packaging according to claim 12, wherein the weight of the object to be packaged is 1.2 kg or more.

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