Packaging materials, packaging rolls and packaging bags

Abstract

To provide a packaging material capable of increasing a width of an opening formed by tearing, while suppressing reduction in strength.SOLUTION: A packaging material comprises: a sheet body 10; a notch group 20 including a plurality of notches 21 arranged in an opening start area 11 of the sheet body 10; a protective sheet 30 arranged by covering the notch group 20; and first and second cut tapes 41, 42 extending in an opening direction. The cut tapes 41, 42 are at least partially separated from each other in an opening intersection direction. The notch group 20 includes the plurality of notches 21 arranged in the opening intersection direction, and further includes at least a first end side notch 21A1 crossing the first cut tape 41, and a second end side notch 21A2 crossing the second cut tape 42. A pair of notches 21 adjacent to each other in the opening intersection direction among the plurality of notches 21 are separated in the opening direction, and each have overlapping parts 23 overlapped with each other as viewed in the opening direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging material, a packaging material roll, and a packaging bag. [Background technology]

[0002] Conventionally, film-like packaging materials that enable block foods such as rice balls, sandwiches, and cooked bread to be eaten hygienically by hand have been known. For example, Patent Document 1 discloses a packaging material that can be opened by pinching and tearing a tear strip provided on the packaging material, forming a strip-shaped opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-341715 Summary of the Invention [Problem to be solved by the invention]

[0004] In the packaging material described in Patent Document 1, a strip of cutting tape attached to the packaging material so as to be continuous with the tear strip is torn along with the packaging material, forming an opening corresponding to the width of the cutting tape. Because the width of the opening is typically small compared to the size of the food, it can be difficult to expose the food for consumption or removal through the opening. Therefore, it is possible to widen the opening by increasing the width of the tear strip. However, in this case, the notch around the tear strip becomes longer, reducing the strength of the packaging material. A reduction in the strength of the packaging material can lead to problems such as stress concentration around the notch when tension is applied to the raw roll during manufacturing, which can cause the packaging material to break. Another problem is that the tear strip tends to roll up, making the packaging material more susceptible to accidental tearing.

[0005] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a packaging material that can increase the width of the opening formed by tearing while suppressing a decrease in strength. [Means for solving the problem]

[0006] (1) The packaging material of the present invention comprises a sheet body capable of enclosing a packaged item and having an inner surface facing the packaged item and an outer surface opposite the inner surface; a notch group arranged in an opening start area set in the sheet body and including a plurality of notches that do not open to the edge of the sheet body; a protective sheet arranged on the sheet body to cover the notch group; and a first cutting tape and a second cutting tape extending from at least the opening start area in an opening direction, wherein at least a portion of the first cutting tape and the second cutting tape are spaced apart from each other in an opening cross direction perpendicular to the opening direction, and the notch group includes a plurality of the notches arranged in the opening cross direction, and includes at least a first end side notch that intersects the first cutting tape and a second end side notch that intersects the second cutting tape, and further, among the plurality of notches, a pair of notches adjacent in the opening cross direction are arranged apart in the opening direction and each have an overlap portion that overlaps with each other when viewed in the opening direction.

[0007] (2) In (1), it is preferable that the notch group has three or more notches including the first end side notch and the second end side notch, and that the first end side notch and the second end side notch are positioned at the same position in the opening direction.

[0008] (3) In (1) or (2), the notch group preferably includes an upstream notch group including at least one of the notches and a downstream notch group including at least one of the notches located downstream of the upstream notch group in the opening direction, and at least one of the upstream notch group and the downstream notch group is a parallel notch group including a plurality of the notches arranged in parallel along the opening cross direction.

[0009] (4) In (3), the number of notches in the upstream notch group may be different from the number of notches in the downstream notch group.

[0010] (5) In (3), the number of the notches in the upstream notch group and the number of the notches in the downstream notch group may be the same.

[0011] (6) In (4), the upstream notch group includes three of the notches, and the downstream notch group includes two of the notches.

[0012] (7) In any of (1) to (6), it is preferable that the notch has a length extending in the direction crossing the opening direction, and that both ends of the length are located downstream of the center of the length in the opening direction.

[0013] In (8) and (7), the notch preferably has a shape that is convex on the upstream side in the unsealing direction and has any one of an arc shape, an inverted V shape, and a trapezoid shape.

[0014] (9) In any one of (1) to (8), the first cutting tape and the second cutting tape may have a portion where they intersect with each other.

[0015] (10) In any one of (1) to (9), the protective sheet is preferably disposed on the outer surface of the sheet body.

[0016] (11) In any of (1) to (10), it is preferable that a pair of strip-shaped sheet portions extending in the opening direction are arranged on at least one of the inner and outer surfaces of the sheet body outside each of the first cutting tape and the second cutting tape.

[0017] (12) The packaging bag of the present invention includes a bag body in which the sheet body of the packaging material of any one of (1) to (11) is formed into a bag shape, and an item to be packaged is contained inside the bag body.

[0018] (13) In (12), the sheet body may be folded to form the bag body into a cubic shape.

[0019] (14) The packaging material roll of the present invention is a packaging material roll wound into a roll, in which the packaging material of (11) is integrated so as to be continuous in the direction in which the strip-shaped sheet portion extends. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a packaging material that can increase the width of the opening formed by tearing while suppressing a decrease in strength. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is a plan view showing a packaging material according to the embodiment. [Figure 2] FIG. 1 is a perspective view of a packaging material according to an embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the packaging material according to the embodiment. [Figure 4A] 1 is an enlarged plan view showing an opening start area and its surroundings set in a packaging material according to an embodiment. FIG. [Figure 4B] FIG. 4 is an enlarged plan view showing a group of notches according to the embodiment. [Figure 4C] FIG. 10 is an enlarged plan view showing another example of a notch group according to the embodiment. [Figure 5] 1 is a perspective view showing a state in which food is packaged in the packaging material of the embodiment. FIG. [Figure 6] FIG. 2 is a perspective view showing a state in which the packaging material of the embodiment is being opened. [Figure 7A] FIG. 10 is a diagram for explaining details of the notch group according to the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 7B]FIG. 10 is a plan view showing a state in which the sheet body is opened starting from a group of notches in the embodiment. [Figure 8] FIG. 2 is a perspective view showing an example of a packaging bag obtained by processing the packaging material according to the embodiment. [Figure 9] 1 is a perspective view showing a packaging material roll according to an embodiment. FIG. [Figure 10] 1 is a side view schematically illustrating an example of a production line for carrying out a method for producing a packaging material according to an embodiment. [Figure 11A] FIG. 10 is a diagram showing a group of notches according to a first modified example of the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 11B] FIG. 10 is a plan view showing a state in which the sheet main body is opened starting from a group of notches in the first modified example. [Figure 12A] FIG. 10 is a diagram showing a group of notches according to a second modified example of the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 12B] FIG. 10 is a plan view showing a state in which the sheet main body is opened starting from a group of notches in the second modified example. [Figure 13A] FIG. 10 is a diagram showing a group of notches according to a third modified example of the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 13B] FIG. 11 is a plan view showing a state in which the sheet main body is opened starting from a group of notches in the third modified example. [Figure 14A] FIG. 10 is a diagram showing a group of notches according to a fourth modified example of the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 14B] FIG. 13 is a plan view showing a state in which the sheet main body is opened starting from a group of notches in the fourth modified example. [Figure 15A] FIG. 10 is a diagram showing a group of notches according to a fifth modified example of the embodiment, and is a partially enlarged plan view of the sheet main body. [Figure 15B] FIG. 13 is a plan view showing a state in which the sheet main body is opened starting from a group of notches in the fifth modified example. [Figure 16] 10 is a plan view of a packaging material according to an embodiment, to which a modified example in which a cutting tape with a different shape is applied. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments will be described with reference to the drawings.

[0023] (packaging material) Fig. 1 is a plan view of a packaging material 1 according to an embodiment, seen from the outer surface 10b side of the main sheet body 10, Fig. 2 is a perspective view of the packaging material 1, and Fig. 3 is an exploded perspective view of the packaging material 1. Fig. 4A is an enlarged view showing an opening start region 11 set in the packaging material 1 and its surroundings. Fig. 4B is an enlarged view showing a group of notches provided in the packaging material 1. Fig. 5 is a perspective view showing a state in which food 5 is packaged in the packaging material 1, and Fig. 6 is a perspective view showing a state in which the packaging material 1 is being opened.

[0024] As shown in FIG. 5, for example, the packaging material 1 packages rectangular parallelepiped food 5 as an article to be packaged by push-up packaging, which will be described later.

[0025] As shown in Figures 1 to 3, the packaging material 1 according to the embodiment includes a main sheet body 10 that forms the main body of the packaging material 1, a protective sheet 30, a first cutting tape 41, a second cutting tape 42, and a strip-shaped sheet portion 50. In Figures 1 to 3, the length direction of the packaging material 1 and the main sheet body 10 is indicated by L, and the width direction is indicated by W. Hereinafter, the length direction and width direction of the main sheet body 10 refer to the directions indicated by L and W in Figures 1 to 3, respectively. The width direction W may also be referred to as the left-right direction. In this case, the left-right direction refers to the left-right direction in Figure 1.

[0026] 1 to 3, the main sheet body 10 is a resin film formed in a rectangular shape having a length direction and a width direction. The main sheet body 10 has an inner surface 10a that faces the packaged item and an outer surface 10b opposite the inner surface 10a. The main sheet body 10 has a shape and size that allows it to surround the entire surface of the packaged item.

[0027] An opening start region 11 is set in a predetermined location in the widthwise center of the sheet body 10 and on one end side in the lengthwise direction (the upper end side in FIG. 1 ). A notch group 20 including a plurality of notches 21 is arranged in the opening start region 11 of the sheet body 10. Each of the plurality of notches 21 is a cut formed by penetrating the sheet body 10 with a thin blade. None of the plurality of notches 21 is open to the edge 10e of the four sides of the sheet body 10.

[0028] A first cutting tape 41 passes through one widthwise end of the opening start region 11 (the left end in FIG. 1), and a second cutting tape 42 passes through the other widthwise end of the opening start region 11 (the right end in FIG. 1). The first cutting tape 41 and the second cutting tape 42 are parallel to the lengthwise direction of the sheet main body 10 and extend over the entire length of the sheet main body 10. The first cutting tape 41 and the second cutting tape 42 are arranged on the inner surface 10a of the sheet main body 10. The first cutting tape 41 and the second cutting tape 42 are attached to the inner surface 10a of the sheet main body 10 by means of ultrasonic sealing, heat sealing, adhesive application, or the like.

[0029] In addition, each of the first cutting tape 41 and the second cutting tape 42 may be placed on the outer surface 10b of the sheet main body 10, or may be placed on both the inner surface 10a and the outer surface 10b, sandwiching the sheet main body 10 therebetween.

[0030] The sheet body 10 is opened by being torn from the opening initiation region 11 along the lengthwise direction, which is the extension direction of the first cutting tape 41 and the second cutting tape 42, toward the other end (downward in FIG. 1) opposite the opening initiation region 11. Arrow M in FIG. 1 indicates the tearing direction of the sheet body 10, i.e., the opening direction. Furthermore, arrow M1 indicates the upstream side of the opening direction, and arrow M2 indicates the downstream side of the opening direction.

[0031] The first cutting tape 41 and the second cutting tape 42 extend in the opening direction and are spaced apart from each other in a state parallel to each other in the width direction of the sheet body 10, which is the opening cross direction orthogonal to the opening direction.

[0032] The multiple notches 21 constituting the notch group 20 have the same shape and size. As shown in FIG. 4A , the notches 21 of this embodiment have a symmetrical arc shape that gently convex toward the upstream side in the opening direction. Each notch 21 extends generally in the width direction of the sheet body 10. Therefore, the notch 21 has a length that extends in the width direction of the sheet body 10. It can also be said that the arc-shaped notch 21 has a shape in which both ends in the length direction are located downstream in the opening direction relative to the center in the length direction.

[0033] The notch group 20, which has a plurality of such notches 21, includes an upstream notch group 20A and a downstream notch group 20B. The upstream notch group 20A includes a plurality of first notches 21A arranged in a row in the width direction of the sheet body 10. The downstream notch group 20B includes a plurality of second notches 21B arranged in a row in the width direction of the sheet body 10. The downstream notch group 20B is disposed downstream in the opening direction and away from the upstream notch group 20A. Hereinafter, when it is not necessary to particularly describe the first notches 21A and the second notches 21B separately, these notches 21A and 21B may be collectively referred to simply as notches 21.

[0034] The upstream notch group 20A in this embodiment is a parallel notch group having three first notches 21A arranged at equal intervals in the width direction of the sheet body 10. The interval between adjacent first notches 21A in the width direction of the sheet body 10 is arbitrary, but the interval is, for example, about 1 / 10 to 9 / 10 of the length of the first notches 21A.

[0035] The downstream notch group 20B in this embodiment is a parallel notch group having two second notches 21B spaced apart in the width direction of the sheet body 10. That is, in this embodiment, the total number of notches 21 is three or more, and the number of notches 21 in the upstream notch group 20A is different from the number of notches 21 in the downstream notch group 20B. The widthwise spacing between the two second notches 21B is the same as the spacing between the first notches 21A in the upstream notch group 20A. When viewed in the opening direction, which is the length direction of the sheet body 10, each of the two second notches 21B in the downstream notch group 20B is located between the first notches 21A in the upstream notch group 20A. The longitudinal center position of each second notch 21B in the downstream notch group 20B and the midpoint between adjacent first notches 21A in the upstream notch group 20A are aligned in the width direction.

[0036] The downstream notch group 20B is disposed downstream in the opening direction, spaced apart from the upstream notch group 20A by a distance of, for example, about 1 mm to 20 mm.

[0037] 4B , when the five notches 21, consisting of the three first notches 21A in the upstream notch group 20A and the two second notches 21B in the downstream notch group 20B, are viewed in plan, these five notches 21 are arranged in a staggered pattern from one end to the other end in the width direction of the sheet body 10, with the notches 21 being alternately shifted between one end and the other in the length direction of the sheet body 10. Therefore, the three first notches 21A in the upstream notch group 20A and the two second notches 21B in the downstream notch group 20B are adjacent to each other in the width direction of the sheet body 10. That is, from left to right, the notches are arranged in the order of the first notch 21A, the second notch 21B, the first notch 21A, the second notch 21B, and the first notch 21A. A pair of first notches 21A and second notches 21B adjacent in the width direction each have an overlapping portion 23 that overlaps with each other when viewed in the length direction.

[0038] As shown in FIG. 4A , of the three first notches 21A in the upstream notch group 20A, the left first notch 21A intersects the first cutting tape 41, and the right first notch 21A intersects the second cutting tape 42. Hereinafter, the first notch 21A intersecting the first cutting tape 41 may be referred to as the first end-side notch 21A1, and the first notch 21A intersecting the second cutting tape 42 may be referred to as the second end-side notch 21A2. The first end-side notch 21A1 and the second end-side notch 21A2 are located at the same position in the longitudinal direction of the sheet main body 10. That is, the positions of the first end-side notch 21A1 and the second end-side notch 21A2 are aligned in the longitudinal direction of the sheet main body 10.

[0039] The first end-side notch 21A1 has a portion to the left of its longitudinal center that intersects with the first cutting tape 41. The second end-side notch 21A2 has a portion to the right of its longitudinal center that intersects with the second cutting tape 42. The first cutting tape 41 is positioned more inward (toward the second cutting tape 42) than the left end 24a of the first end-side notch 21A1. The second cutting tape 42 is positioned more inward (toward the first cutting tape 41) than the right end 24f of the second end-side notch 21A2.

[0040] 4B, by forming each of the first notches 21A in the upstream notch group 20A, the mountain-shaped portions of the first notches 21A downstream in the opening direction become first opening pieces 25A. By forming each of the second notches 21B in the downstream notch group 20B, the mountain-shaped portions of the second notches 21B downstream in the opening direction become second opening pieces 25B.

[0041] As described above, in this embodiment, each notch 21 in the notch group 20 has the same shape and size, and the spacing between adjacent notches 21 in the width direction is also the same. However, the shapes and sizes of the notches 21 may be different, and the spacing between them in the width direction may also be different. For example, FIG. 4C shows an example in which the length of the two second notches 21B in the downstream notch group 20B is shorter than the three first notches 21A in the upstream notch group 20A. In this case, the spacing between the two second notches 21B is greater than the spacing between the first notches 21A. Furthermore, a pair of adjacent first and second notches 21A and 21B in the width direction each have an overlapping portion 23 that overlaps with each other when viewed in the longitudinal direction.

[0042] The protective sheet 30 is a rectangular film that is long in the width direction of the main sheet body 10. A portion of the protective sheet 30 is adhered to the outer surface 10b of the main sheet body 10. The above-mentioned tear strips 25A and 25B are turned over to the outer surface 10b side via the protective sheet 30.

[0043] As shown in FIG. 4A , the protective sheet 30 includes a protective portion 31 and a gripping portion 32. The protective portion 31 is attached to the outer surface 10b, covering the notch group 20. The protective portion 31 is attached with an adhesive to a rectangular area including the area where the notch group 20 is formed and the area surrounding the area where the notch group 20 is formed. The adhesive area of ​​the protective portion 31 is approximately equal to the opening start area 11. The entire area of ​​the protective portion 31 is attached to the outer surface 10b, and this protective portion 31 covers all of the notches 21 in the notch group 20. Therefore, all of the notches 21 are separated from the outside by the protective portion 31. The gripping portion 32 is a portion that continues from the protective portion 31 upstream in the opening direction. The gripping portion 32 is not attached to the outer surface 10b and can be picked up with fingers and turned toward the outer surface 10b.

[0044] As shown in FIGS. 1 to 3, a pair of strip-shaped sheet portions 50 extending in the longitudinal direction of the sheet main body 10 is disposed on the inner surface 10a of the sheet main body 10. The pair of strip-shaped sheet portions 50 includes a first strip-shaped sheet portion 51 disposed a predetermined distance outward in the width direction of the sheet main body 10 from the first cutting tape 41, and a second strip-shaped sheet portion 52 disposed a predetermined distance outward in the width direction from the second cutting tape 42. These strip-shaped sheet portions 51, 52 are approximately parallel to the respective cutting tapes 41, 42. Each strip-shaped sheet portion 51, 52 is attached to the inner surface 10a of the sheet main body 10 by means of ultrasonic sealing, heat sealing, adhesive application, or the like.

[0045] In addition, each of the first strip-shaped sheet portion 51 and the second strip-shaped sheet portion 52 may be arranged on the outer surface 10b of the sheet main body 10, or may be arranged on both the inner surface 10a and the outer surface 10b with the sheet main body 10 sandwiched therebetween.

[0046] The main sheet body 10, the protective sheet 30, the cutting tapes 41 and 42, and the strip-shaped sheet portions 51 and 52 are made of flexible, transparent or translucent synthetic resin film. The resin film preferably has heat-welding properties to facilitate heat sealing. The resin film may be a single-layer or multi-layer synthetic resin film. In the case of a single layer, it may be a synthetic resin film such as (PE), polypropylene (PP), or polyethylene terephthalate (PET). In the case of a multi-layer, it may be a synthetic resin film such as polypropylene coated with PVDC (polyvinylidene chloride) to provide a moisture-blocking barrier layer. Specifically, OPP (biaxially oriented polypropylene) or CPP (non-oriented polypropylene) is preferably used. At least one of the main sheet body 10, the protective sheet 30, the cutting tapes 41 and 42, and the strip-shaped sheet portions 51 and 52 may be made of a material other than the resin film, such as paper or nonwoven fabric.

[0047] The resin films forming the main sheet body 10, the protective sheet 30, the cutting tapes 41, 42, and the strip-shaped sheet portions 51, 52 may have the same thickness. However, it is desirable to use a protective sheet 30 that is relatively thick and stiff so that the gripping portion 32, which is gripped with fingers when opening, does not tear. It is also desirable that the main sheet body 10 has a thickness that allows the package to be maintained in its packaged state, but also allows it to be easily torn when opening.

[0048] As shown in Fig. 5, for example, the packaging material 1 packages the food 5 by pushing the rectangular parallelepiped food 5 as the packaged item against the approximate center of the inner surface 10a and deforming the packaging material 1 to conform to the outer shape of the food 5 to encase the food 5 using so-called push-up packaging. After packaging the food 5, the packaging material 1 is folded over on the back side of the food 5, which is not visible in Fig. 5, to seal the food 5 from the outside, and the packaged state is maintained by applying tape or the like. Alternatively, the folded portion on the back side of the packaging material 1 may be heat-sealed to maintain the sealed state. After packaging the food 5, the length direction of the main sheet body 10 is approximately parallel to the length direction of the food 5, and a protective sheet 30 adhered to the outer surface 10b is placed at the center of the front side, slightly toward one end.

[0049] When the gripping portion 32 of the protective sheet 30 of the packaging material 1 is turned over and pulled in the opening direction toward the protective portion 31 as indicated by the arrow M in Figures 5 and 6, the central portion of the width direction of the sheet body 10 is torn as shown in Figure 6, forming an opening 13, and the packaging material 1 is opened.

[0050] When the protective sheet 30 is gripped by the gripping portion 32 and pulled in the opening direction, the protective portion 31 peels off from the outer surface 10b. When the protective sheet is continued to be pulled in the opening direction, the multiple tear strips 25A, 25B attached to the protective portion 31 peeling off from the outer surface 10b are peeled off along with the protective portion 31. When the multiple tear strips 25A, 25B are peeled off by the protective sheet 30 in this manner, as shown in FIG. 7A , slits 12a and 12f are formed extending in the opening direction from the left end 24a of the first end-side notch 21A1 and the right end 24f of the second end-side notch 21A2, respectively. The left and right slits 12a and 12f are formed on the outer sides of each cutting tape 41, 42 in the width direction of the sheet body 10.

[0051] In the present embodiment, there are a total of five notches 21, and when the gripping portion 32 is pinched and the protective sheet 30 is pulled in the opening direction as described above, first, each of the first tear strips 25A located downstream of each of the first notches 21A in the upstream notch group 20A and attached to the protective portion 31 is turned over toward the outer surface 10b. Then, as shown in Fig. 7A , the sheet body 10 is torn from the outer edge 24a of the left-side first notch 21A (first end-side notch 21A1) to form a slit 12a, and the sheet body 10 is torn from the outer edge 24f of the right-side first notch 21A (second end-side notch 21A2) to form a slit 12f. At the same time, slits 12b, 12c, 12d, and 12e are generated in the opening direction from the right-side end 24b of the left-side first notch 21A, the opposite ends 24c and 24d of the middle first notch 21A, and the left-side end 24e of the right-side first notch 21A, respectively. Slits 12b and 12c reach the left-side second notch 21B of the downstream notch group 20B, and slits 12d and 12e reach the right-side second notch 21B of the downstream notch group 20B. As a result, the three first notches 21A and the two second notches 21B are continuous via slits 12b, 12c, 12d, and 12e. When the protective sheet 30 is further pulled in the opening direction from this state, the three first opening strips 25A formed by the three first notches 21A downstream of the upstream notch group 20A and the two second opening strips 25B formed by the two second notches 21B are peeled off as a single unified opening strip.

[0052] When the gripping portion 32 is further pulled, the sheet body 10 between the left and right slits 12a and 12f is torn in the tearing direction, starting from the aforementioned bundled tear strip. This results in a strip-shaped opening between the left and right slits 12a and 12f, as shown in FIGS. 6 and 7B. That is, a strip-shaped opening 13 is formed. At the tearing starting end, which is the upstream end of the opening 13 in the tearing direction, two short, strip-shaped remaining pieces 15a and 15b extend in the tearing direction. The pair of left and right remaining pieces 15a and 15b are parts of the sheet body 10 that were adhered to the protective portion 31. The left remaining piece 15a is formed between the pair of left and right slits 12b and 12c that reach the second notch 21B on the left side. The right remaining piece 15b is formed between the pair of left and right slits 12d and 12e that reach the second notch 21B on the right side.

[0053] The packaging material 1 is opened by the opening 13 extending in the opening direction. When the packaging material 1 is opened in this manner, for example, the food 5 can be eaten through the opening 13 while being held by hand, or the food 5 can be removed through the opening 13.

[0054] As described above, when the sheet body 10 is torn and the left and right cuts 12a, 12f are formed to form the opening 13, the first cutting tape 41 is positioned near the inside of the left cut 12a, and the second cutting tape 42 is positioned near the inside of the right cut 12f. Here, even if the left cut 12a curves inward and propagates, the cut 12a abuts the first cutting tape 41 and does not cut any further inward, but instead propagates along the outer edge 41a of the first cutting tape 41. Even if the right cut 12f curves inward and propagates, the cut 12f abuts the second cutting tape 42 and does not cut any further inward, but instead propagates along the outer edge 42a of the second cutting tape 42. As a result, the pair of left and right cuts 12a, 12f formed on both sides of the first cutting tape 41 and the second cutting tape 42 do not disappear, and the package can be completely opened.

[0055] (packaging bag) The packaging form using the packaging material 1 according to the embodiment is not limited to the push-up packaging shown in FIG. 5. For example, as shown in FIG. 8, both widthwise ends of the sheet body 10 are adhered to each other to form a back seal portion 14a, and opposing ends at the other longitudinal end (the lower end in FIG. 8) are adhered to each other to form a bottom seal portion 14b, thereby obtaining a packaging bag 14 folded in a so-called palm-to-palm packaging form with an opening 14c remaining. This packaging bag 14 includes a rectangular bag body 14d. The packaging bag 14 can contain and package a block of food, such as rice balls, sandwiches, bread rolls, or hamburgers, or a liquid, powder, or granular food product. After the food product is contained, the opening 14c is airtightly sealed. The packaging bag 14 may also be formed by further folding the sheet body 10 appropriately to form the bag body 14d into a three-dimensional shape. In this case, the three-dimensional shape may be a cube, a rectangular parallelepiped, a triangular prism, a cylindrical shape, or other three-dimensional shape.

[0056] In this way, when forming the packaging bag 14 from the packaging material 1, a large number of these packaging bags 14 can be produced, and any desired packaged items can be placed in the packaging bags 14 and sealed at the supply destination.

[0057] (Packaging material roll) A large number of packaging materials 1 according to the embodiment can be continuously obtained from a packaging material roll 1R according to the embodiment shown in FIG.

[0058] The packaging material roll 1R according to the embodiment is a long packaging material roll 1G wound into a roll, in which a large number of packaging materials 1 are integrated so as to be continuous along the length direction. By cutting the packaging material roll 1R along the cutting boundary 1c, a large number of packaging materials 1 can be obtained successively.

[0059] The packaging material raw web 1G is mainly composed of a long, strip-shaped sheet body raw web 10G made of a resin film. The sheet body raw web 10G has cutting boundaries 1c that separate a large number of sheet body portions 10A, which will become the individual sheet bodies 10. Each of the sheet body portions 10A has the above-mentioned notch group 20, and a protective sheet 30 that covers the notch group 20 is adhered to the surface that will become the outer surface 10b. The protective portion 31 of the protective sheet 30 is releasably adhered to the sheet body raw web 10G with an adhesive.

[0060] In the packaging material raw roll 1R, the protective sheet 30 has a gripping portion 32 that is not adhered to the sheet body raw roll 10G and is positioned on the roll base side, and a protective portion 31 that is adhered to the sheet body raw roll 10G and is positioned on the roll unwind side.

[0061] Furthermore, the respective webs that will become the first cutting tape 41 and the second cutting tape 42, and the first strip-shaped sheet portion 51 and the second strip-shaped sheet portion 52, i.e., the first cutting tape web 41G and the second cutting tape web 42G, and the first strip-shaped sheet portion web 51G and the second strip-shaped sheet portion web 52G, are adhered to the surface that will be set as the inner surface 10a. The packaging material web roll 1R is wound into a roll shape so that the outer surface 10b, to which the protective sheet 30 is adhered, is positioned on the outer peripheral surface side. Therefore, the cutting tape webs 41G, 42G and the strip-shaped sheet portion webs 51G, 52G are positioned on the inner peripheral surface side.

[0062] By sequentially cutting the cutting boundary 1c while unwinding the packaging material roll 1G from the packaging material roll 1R, the packaging material 1 can be obtained one sheet at a time. Furthermore, when unwinding the packaging material roll 1G from the packaging material roll 1R, the protective portion 31 of the protective sheet 30 that is adhered to the sheet body roll 10G is unwound first, followed by the unadhered tab portion 32. This prevents the tab portion 32 of the protective sheet 30 from turning over or folding and overlapping, allowing for smooth unwinding. Furthermore, if the protective sheet 30 is relatively thick and the tab portion 32 is stiff, the tab portion 32 will not fold during winding of the packaging material roll 1R, allowing for smooth winding.

[0063] (Manufacturing method) The packaging material roll 1R and the packaging material 1 according to the embodiment are manufactured, for example, by a manufacturing line 60 shown in FIG.

[0064] In the production line 60 shown in FIG. 10, a sheet body 10G is unwound in the H direction from a sheet body roll 10R and transported. Immediately after being unwound from the sheet body roll 10R, a first cut tape roll 41G and a second cut tape roll 42G unwound from a cut tape roll 40R, and a first strip-shaped sheet roll 51G and a second strip-shaped sheet roll 52G unwound from a strip-shaped sheet roll 50R are stacked at predetermined locations on the outer peripheral surface of the sheet body 10G. Next, the cut tape rolls 41G and 42G and the strip-shaped sheet rolls 51G and 52G are attached to the sheet body 10G in a sealing unit 61. The sealing unit 61 uses an attachment method such as ultrasonic sealing or heat sealing, but ultrasonic sealing is preferred because it is less likely to cause wrinkles in the attached area and its surroundings.

[0065] Next, a plurality of notches 21 of the notch group 20 are formed in the sheet main body raw web 10G in the notch forming section 62. The plurality of notches 21 are formed by punching the sheet main body raw web 10G with a plurality of cutters (not shown) having the shapes of the notches 21. The notch groups 20 are formed intermittently in the opening start regions 11 of each of the packaging materials 1 partitioned in the sheet main body raw web 10G by the above-mentioned cutting boundaries 1c.

[0066] Next, at the protective sheet adhering section 63, the protective sheet 30 is adhered to the surface of the sheet main body raw roll 10G opposite to the side to which the cut tape raw rolls 41G, 42G and the strip-shaped sheet portion raw rolls 51G, 52G are adhered. The protective sheets 30 are peeled off one by one from the protective sheet raw roll 30R, in which the protective sheets 30 are adhered to a backing at regular intervals, and are adhered intermittently to the opening start region 11 of each sheet main body 10A.

[0067] In the above manner, the cutting tape rolls 41G, 42G and the strip-shaped sheet rolls 51G, 52G are adhered to the sheet main body roll 10G, multiple notches 21 of the notch group 20 are formed in the opening start region 11, and the packaging material roll 1G shown in FIG. 9 is manufactured with the protective sheet 30 adhered to the opening start region 11. This packaging material roll 1G is then wound up to obtain a packaging material roll 1R. By unwinding the packaging material roll 1G from this packaging material roll 1R and cutting the sheet main body 10A at the cutting boundary 1c, packaging materials 1 can be obtained one by one.

[0068] In the packaging material raw roll 1G according to the embodiment, a first strip-shaped sheet raw roll 51G and a second strip-shaped sheet raw roll 52G extending in the longitudinal direction are attached to positions near both widthwise ends, respectively. This prevents thickness unevenness, which occurs when the thickness at the widthwise center is increased due to the first cutting tape raw roll 41G and the second cutting tape raw roll 42G and the protective sheet 30, and makes the thickness uniform overall in the width direction. As a result, when the packaging material raw roll 1G is wound up to obtain a packaging material raw roll 1R, twisting due to thickness unevenness and poor winding are prevented.

[0069] According to the embodiment described above, the following effects are achieved.

[0070] The packaging material 1 according to the embodiment comprises a sheet body 10 capable of enclosing a food product 5 as a packaged item, the sheet body 10 having an inner surface 10a facing the food product 5 and an outer surface 10b opposite the inner surface 10a, a notch group 20 arranged in an opening start region 11 set in the sheet body 10 and including a plurality of notches 21 that do not open to an edge 10e of the sheet body 10, a protective sheet 30 arranged on the sheet body 10 to cover the notch group 20, and first cutouts extending from at least the opening start region 11 in the opening direction and spaced apart from each other in an opening cross direction perpendicular to the opening direction. The notch group 20 includes a plurality of notches 21 arranged in the cross-opening direction, and includes at least a first end-side notch 21A1 that intersects with the first cutting tape 41 and a second end-side notch 21A2 that intersects with the second cutting tape 42, and further, among the plurality of notches 21, a pair of notches 21 adjacent to each other in the cross-opening direction are arranged apart in the opening direction and each have an overlap portion 23 that overlaps with each other when viewed in the opening direction.

[0071] According to the embodiment, at least two first end-side notches 21A1 and second end-side notches 21A2 serve as starting points for tearing to open the sheet main body 10, and the opening 13 for opening can be formed between the first cutting tape 41 and the second cutting tape 42 where these two notches 21A1, 21A2 intersect. By arranging at least two notches 21 in the opening cross direction, the width of the opening 13 formed in the sheet main body 10 can be increased. This allows the width of the opening 13 formed by tearing to be increased.

[0072] Furthermore, because at least two notches 21 provide starting points for tearing the main sheet body 10, the length of each notch 21 can be made shorter than in the case of a single notch, and they can be arranged more dispersedly. This makes it possible to prevent a decrease in strength of the main sheet body 10 and packaging material 1 due to the notches 21. For example, as described above, when the original packaging material 1G is wound up to produce the original packaging material roll 1R, or when the original packaging material 1G is unwound from the original packaging material roll 1R to produce the packaging materials 1 one by one, tension is applied to the original packaging material 1G. Even when tension is applied in this way, a decrease in strength is prevented, so This prevents stress from concentrating around the notches 21 and causing breakage of the packaging material roll 1G or the packaging material 1. Furthermore, because the size of each notch 21 is prevented from increasing, the tear pieces 25A, 25B on the downstream side of the notch 21 in the opening direction are more likely to turn up, making it less likely that the packaging material 1 will be accidentally torn apart.

[0073] That is, the packaging material 1 of the embodiment can increase the width of the opening 13 formed by tearing while suppressing a decrease in strength.

[0074] Furthermore, since the force required for tearing can be reduced, it is possible to prevent problems such as the package being opened suddenly due to excessive force being applied to open it, causing the packaged contents to fly out.

[0075] In the packaging material 1 of the embodiment, the notch group 20 has three or more notches 21 including a first end side notch 21A1 and a second end side notch 21A2, and it is preferable that the first end side notch 21A1 and the second end side notch 21A2 are positioned at the same position in the opening direction.

[0076] This allows for a large number of notches 21, which allows for a larger width of the opening 13. Furthermore, the cuts 12 are generated almost simultaneously from the end 24a of the first end-side notch 21A1 and the end 24f of the second end-side notch 21A2, which are the starting points of the opening 13, and the sheet body 10 can be torn without the tearing force being biased to either the left or right. This allows the sheet body 10 to be opened smoothly.

[0077] In the packaging material 1 of the embodiment, the notch group 20 has an upstream notch group 20A including at least one notch 21 and a downstream notch group 20B including at least one notch 21 arranged downstream in the opening direction from the upstream notch group 20A, and at least one of the upstream notch group 20A and the downstream notch group 20B is a parallel notch group including multiple notches 21 arranged in parallel along the opening cross direction.

[0078] This allows the multiple notches 21 of the parallel notch group arranged in parallel in the direction crossing the opening direction to be dispersed between each cutting tape 41, 42, thereby further suppressing the reduction in strength due to the notches 21 and making it possible to increase the width of the opening 13.

[0079] In the packaging material 1 of the embodiment, the number of notches 21 in the upstream notch group 20A is different from the number of notches 21 in the downstream notch group 20B, with the upstream notch group 20A having three notches 21 and the downstream notch group 20B having two notches 21.

[0080] This allows multiple notches 21 to be dispersed between the cutting tapes 41, 42, thereby further suppressing a decrease in strength due to the notches 21 and increasing the width of the opening 13. Note that the number of notches 21 in the upstream notch group 20A and the number of notches 21 in the downstream notch group 20B may be the same, and in this case, the same effect can be obtained.

[0081] In the packaging material 1 of the embodiment, the notch 21 has a length extending in a direction perpendicular to the opening direction, and it is preferable that both ends of the length be located downstream in the opening direction from the center of the length, and an example of such a shape is an arc shape.

[0082] This makes it easy to tear the main sheet body 10 smoothly, starting from both ends of the notch 21 located on the opening direction side. Even if the main sheet body 10 is relatively thick, the main sheet body 10 can be torn smoothly and opened easily.

[0083] In the packaging material 1 according to this embodiment, the protective sheet 30 is preferably disposed on the outer surface 10b of the main sheet body 10.

[0084] As a result, after the main sheet body 10 is opened, the protective sheet 30 does not remain on the side of the main sheet body 10 that packages the food 5. This allows the food 5 to be eaten without the protective sheet 30 getting in the way, and also makes it easy to remove the food from the packaging material 1.

[0085] In the packaging material 1 of the embodiment, it is preferable that a pair of strip-shaped sheet portions 51A, 51B extending in the opening direction are arranged on at least one of the inner surface 10a and the outer surface 10b of the sheet main body 10 outside each of the first cutting tape 41 and the second cutting tape 42.

[0086] This makes it possible to prevent unevenness in the overall thickness in the width direction of the packaging material 1. Therefore, when the raw sheet of packaging material 1 (the above-described raw sheet of packaging material 1G) is wound into a roll, it is possible to prevent poor winding due to unevenness in thickness.

[0087] The packaging bag 14 according to the embodiment includes a bag body 14d in which the main sheet body 10 of the packaging material 1 is formed into a bag shape, and an item to be packaged is accommodated inside the bag body 14d.

[0088] This allows the packaging material 1 to be used as is to package the packaged item by push-up packaging, and also allows the packaging material 1 to be processed into a packaging bag 14, which can then be used to package the packaged item in a variety of forms, such as liquid, powder, or granular.

[0089] The packaging bag 14 according to the embodiment includes a form in which the main sheet body 10 is folded to form a bag body 14d in a cubic shape.

[0090] This allows the bag body 14d to have a variety of shapes depending on how the main sheet body 10 is folded.

[0091] The packaging material roll 1R according to the embodiment is formed by winding up a packaging material roll 1G in which the packaging material 1 is integrated so as to be continuous in the direction in which the strip-shaped sheet portion 50 extends.

[0092] This allows for easy production of a large number of packaging materials 1 by cutting out the packaging material roll 1G. Furthermore, the extension of the strip-shaped sheet portion 50 makes the thickness in the width direction uniform overall, thereby preventing poor winding due to uneven thickness.

[0093] (Modification of notch group) Below, we will explain Modifications 1 to 5, which change the configuration of the notch group 20, i.e., the number and arrangement of the notches 21, in the packaging material 1 of the above embodiment. These Modifications 1 to 5 have the same configuration as the above embodiment except for the changes in the number and arrangement of the notches 21. Therefore, in the following explanation, the same components as the above embodiment will be assigned the same reference numerals and explanations will be omitted, and only the differences will be explained. Note that in the figures referred to below, the opening direction is indicated by arrow M.

[0094] FIG. 11A shows a notch group 20 according to a first modified example. In the notch group 20 of the first modified example, the upstream notch group 20A and the downstream notch group 20B have the reversed patterns of those in the above embodiment. That is, the upstream notch group 20A has two first notches 21A, and the downstream notch group 20B has three second notches 21B. The left second notch 21B of the downstream notch group 20B is a first end-side notch 21B1 that intersects with the first cutting tape 41, and the right second notch 21B is a second end-side notch 21B2 that intersects with the second cutting tape 42. Each notch 21 has an overlapping portion as shown in FIG. 4B. The shape and size of each notch 21 are the same as those in the above embodiment.

[0095] In this first modified example, when the protective sheet 30 is peeled back to open the main sheet body 10, as shown in Fig. 11A, a slit 12 is formed between the notches 21, and the slits 12 on the outer sides of the first cutting tape and the second cutting tape extend in the opening direction. This forms an opening 13 extending in the opening direction as shown in Fig. 11B, and the main sheet body 10 is opened.

[0096] FIG. 12A shows a notch group 20 according to a second modified example. The notch group 20 of the second modified example includes an upstream notch group 20A having two first notches 21A and a downstream notch group 20B disposed downstream of the upstream notch group 20A in the opening direction. The downstream notch group 20B may include at least one second notch 21B, but in this case, only one. The upstream notch group 20A, in which two first notches 21A are arranged parallel to each other in the opening cross direction, is a parallel notch group. Of the two first notches 21A in the upstream notch group 20A, the left first notch 21A is a first end notch 21A1 that intersects with the first cutting tape 41, and the right first notch 21A is a second end notch 21A2 that intersects with the second cutting tape 42. Each notch 21 has an overlapping portion as shown in FIG. 4B. Each notch 21 has an arcuate shape similar to that of the embodiment, but its length is longer than that of the notch 21 of the above embodiment.

[0097] In this second modified example, when the protective sheet 30 is turned over to open the main sheet body 10, as shown in Fig. 12A, a slit 12 is formed between the notches 21, and the slits 12 on the outer sides of the first cutting tape 41 and the second cutting tape 42 extend in the opening direction. This forms an opening 13 extending in the opening direction as shown in Fig. 12B, and the main sheet body 10 is opened.

[0098] When a parallel notch group consisting of two notches 21 and a single notch 21 are arranged separately in the longitudinal direction of the sheet main body 10 as in the second modified example, the pattern may be the opposite of that shown in FIG. 12A , i.e., one notch 21 may be arranged upstream in the opening direction, and a parallel notch group including two notches 21 may be arranged downstream in the opening direction. In other words, the downstream notch group 20B may be a parallel notch group consisting of two notches 21, and the upstream notch group 20A may include one notch 21. In this case, the two notches 21 on the downstream side in the opening direction are a first end notch that intersects with the first cutting tape 41 and a second end notch that intersects with the second cutting tape 42. The single notch 21 on the upstream side in the opening direction has overlapping portions at both ends that overlap the two downstream notches 21 in the longitudinal direction of the sheet main body 10 in the opening direction. In the case of this reverse pattern, when the protective sheet 30 is turned over, slits 12 are formed from both ends of one notch 21 on the upstream side in the opening direction to two notches 21 on the downstream side in the opening direction, and then slits 12 are formed from the outer ends of each of these two notches 21 on the downstream side in the opening direction to the outside of the first cutting tape 41 and the second cutting tape 42. This forms an opening 13 and the sheet body 10 is opened.

[0099] 13A shows a notch group 20 according to a third modified example. The notch group 20 of the third modified example includes the upstream notch group 20A and downstream notch group 20B of the above embodiment, and further includes a second downstream notch group 20C disposed downstream in the opening direction of the downstream notch group 20B. The second downstream notch group 20C includes three third notches 21C arranged in the width direction of the sheet main body 10. The upstream notch group 20A, the downstream notch group 20B, and the second downstream notch group 20C are all parallel notch groups in which multiple notches 21 are aligned in the opening direction. Of the three third notches 21C in the second downstream notch group 20C, the left third notch 21C is a first end-side notch 21C1 that intersects with the first cutting tape 41, and the right third notch 21C is a second end-side notch 21C2 that intersects with the second cutting tape 42. Each notch 21 has an overlap portion 23 as shown in FIG. 4B. The shape and size of each notch 21 are the same as those in the above embodiment.

[0100] In this third modified example, when peeling back the protective sheet 30 to open the main sheet body 10, as shown in FIG. 13A, slits 12 are formed between the notches 21, and the outer slits 12 of the first cutting tape 41 and the second cutting tape 42 extend in the peeling direction. This forms an opening 13 extending in the peeling direction, as shown in FIG. 13B, allowing the main sheet body 10 to be opened. According to the third modified example, even if the main sheet body 10 cannot be peeled back from each of the first notches 21A in the upstream notch group 20A located at the most upstream side in the peeling direction, the main sheet body 10 can be peeled back from each of the second notches 21B in the next downstream notch group 20B. By providing three or more rows of parallel notch groups along the length of the main sheet body 10 as in the third modified example, the main sheet body 10 can be reliably opened.

[0101] FIG. 14A shows a notch group 20 according to a fourth modified example. The notch group 20 of the fourth modified example includes an upstream notch group 20A and a downstream notch group 20B disposed downstream of the upstream notch group 20A in the opening direction. The upstream notch group 20A has two first notches 21A arranged side by side in the width direction of the sheet body 10. The downstream notch group 20B has two second notches 21B arranged side by side in the width direction of the sheet body 10. That is, the number of notches 21 in the upstream notch group 20A is the same as the number of notches 21 in the downstream notch group 20B. Both the upstream notch group 20A and the downstream notch group 20B are parallel notch groups in which two notches 21 are arranged side by side in the opening direction.

[0102] Of the two first notches 21A in the upstream notch group 20A, the left first notch 21A is a first end-side notch 21A1 that intersects with the first cutting tape 41. Of the two second notches 21B in the downstream notch group 20B, the right second notch 21B is a second end-side notch 21B2 that intersects with the second cutting tape 42. Each of the two second notches 21B is offset in the width direction of the sheet body 10 relative to the first notch 21A. This allows each notch 21 to have an overlapping portion as shown in FIG. 4B. The shape of each notch 21 is arc-shaped, similar to the embodiment, but its length is longer than the notch 21 in the above embodiment.

[0103] In this fourth modified example, when the protective sheet 30 is turned over to open the main sheet body 10, as shown in Fig. 14A, a slit 12 is formed between the notches 21, and the slits 12 on the outer sides of the first cutting tape 41 and the second cutting tape 42 extend in the opening direction. This forms an opening 13 extending in the opening direction as shown in Fig. 14B, and the main sheet body 10 is opened.

[0104] FIG. 15A shows a notch group 20 according to a fifth modified example. The notch group 20 of the fifth modified example includes one notch 21 on the upstream side in the opening direction and one notch 21 on the downstream side in the opening direction. The notch 21 on the upstream side in the opening direction is a first end-side notch 21A1 that intersects with the first cutting tape 41. The notch 21 on the downstream side in the opening direction is a second end-side notch 21B2 that intersects with the second cutting tape 42. The two notches 21 are offset from each other in the width direction of the sheet body 10. This allows each notch 21 to have an overlapping portion as shown in FIG. 4B. The shape of each notch 21 is arc-shaped, similar to the embodiment, but its length is longer than the notches 21 of the second and fourth modified examples.

[0105] In this fifth modified example, when the protective sheet 30 is turned over to open the main sheet body 10, as shown in Fig. 15A, a slit 12 is formed between the notches 21, and the slits 12 on the outer sides of the first cutting tape 41 and the second cutting tape 42 extend in the opening direction. This forms an opening 13 extending in the opening direction as shown in Fig. 15B, and the main sheet body 10 is opened.

[0106] (Variations of cutting tape) Next, a modified example in which the shapes of the first cutting tape 41 and the second cutting tape 42 are changed will be described with reference to Fig. 16. Fig. 16 is a plan view of the packaging material 1 similar to Fig. 1, and the same components as those in Fig. 1 are denoted by the same reference numerals.

[0107] The first cutting tape 41 and the second cutting tape 42 of the modified example extend in the length direction of the sheet main body 10, but are curved rather than parallel to the length direction and parallel to each other. In Fig. 16, the first cutting tape 41 and the second cutting tape 42 of the modified example are symmetrical with respect to a line passing through the center in the width direction of the sheet main body 10 as the line of symmetry, and are also symmetrical up and down with respect to a line passing through the center in the length direction as the line of symmetry.

[0108] 16, the four edges 10e of the sheet body 10 are designated as upper edge 10e1, lower edge 10e2, left edge 10e3, and right edge 10e4. The first cutting tape 41 approaches the left edge 10e3 from the upper edge 10e1 toward the lower edge 10e2, approaches the left edge 10e3 at the center of the length, then moves away from the left edge 10e3, and reaches the lower edge 10e2. The second cutting tape 42 approaches the right edge 10e4 from the upper edge 10e1 toward the lower edge 10e2, approaches the right edge 10e4 at the center of the length, then moves away from the right edge 10e4, and reaches the lower edge 10e2. The first cutting tape 41 curves gently from the upper edge 10e1 to the lower edge 10e2, convexly toward the left edge 10e3. The second cutting tape 42 curves gently from the upper edge 10e1 to the lower edge 10e2, convexly toward the right edge 10e4. The first cutting tape 41 and the second cutting tape 42 intersect near the upper edge 10e1 and near the lower edge 10e2.

[0109] Of the notches 21 in the notch group 20, the left notch 21 on the upstream side in the opening direction intersects with the first cutting tape 41, and the right notch 21 on the upstream side in the opening direction intersects with the second cutting tape 42.

[0110] According to this modification, when the protective sheet 30 is peeled back and the main sheet body 10 is torn and opened, the opening 13 in the embodiment is formed in an oval shape between the cutting tapes 41, 42. As a result, a large opening 13 is formed in the center of the packaging material 1, and the width of the opening 13 is small and the area of ​​the main sheet body 10 is large on the upstream and downstream sides of the opening 13 in the opening direction. This makes it easy to expose the packaged food from the packaging material 1 and to grasp the food without touching it. In other words, the food can be eaten hygienically and easily.

[0111] In this modified example, the opening initiation region 11 may be positioned closer to the upper edge 10e1, as shown by the two-dot chain line in FIG. 16 . In this case, the first end-side notch and the second end-side notch in the notch group 20 are appropriately positioned so that they intersect with the cutting tapes 41 and 42 and can serve as opening starting points. Alternatively, the intersection of the first cutting tape 41 and the second cutting tape 42 may be positioned slightly further from the upper edge 10e1 toward the center of the sheet body 10 in the longitudinal direction than the position shown in FIG. 16 , and the notch group 20 may be positioned closer to the upper edge 10e1 than the intersection of the first cutting tape 41 and the second cutting tape 42. The configuration of the notch group 20 is not limited to that shown in FIG. 16 . For example, any of the modified examples of the notch group 20 described above may also be employed.

[0112] The above describes the packaging material 1 according to the embodiment and various modifications based on the embodiment, but the present invention is not limited to these embodiments and modifications, and can be modified as appropriate.

[0113] For example, the shape of the notch 21 is not limited to an arc shape, and may be an inverted V-shape or a trapezoidal shape that convex toward the upstream side in the opening direction. Furthermore, other than the inverted V-shape or trapezoidal shape, the sheet body 10 may have a shape in which both ends in the length direction along the width direction thereof are located downstream in the opening direction from the center portion in the length direction. Such a shape makes it easier to tear the sheet body 10 and create a slit that starts at the notch 21 and extends in the opening direction, making opening easier.

[0114] The number of notches 21 in the notch group 20 is arbitrary, and the number of parallel notch groups including a plurality of notches 21 may be four or more rows, exceeding the three rows in the third modification example.

[0115] The shape of the notches may be the same within a notch group, but a notch group may also be made up of a plurality of notches with different shapes. [Explanation of symbols]

[0116] 1 Packaging material 1G Original packaging material 1R Packaging material roll 5 Food (packaged items) 10 Seat body 10a Inner surface of seat body 10b Outer surface of the seat body 10e Seat body edge 11 Opening start area 14 Packaging bag 14d bag body 20 Notch Group 20A Upstream Notch Group 20B Downstream notch group 21 notches 21A1 First end notch 21A2 Second end notch 21B1 First end notch 21B2 Second end notch 21C1 First end notch 21C2 Second end notch 23 Overlap section 30 Protective Sheet 41 First Cut Tape 42 Second Cut Tape 50 Belt-shaped sheet part

Claims

1. a sheet body capable of enclosing an item to be packaged and having an inner surface facing the item to be packaged and an outer surface opposite to the inner surface; a notch group including a plurality of notches that are arranged in an opening start region set on the sheet body and do not open to an edge of the sheet body; a protective sheet disposed on the sheet body and covering the notch group; A packaging material including at least a first cutting tape and a second cutting tape extending in an opening direction from the opening start area, At least a portion of the first cutting tape and the second cutting tape is spaced apart from each other in a cross-opening direction perpendicular to the opening direction, The notches are: The notch includes a plurality of notches arranged in the cross-opening direction, and includes at least a first end notch intersecting the first cutting tape and a second end notch intersecting the second cutting tape, Furthermore, among the plurality of notches, a pair of notches adjacent to each other in the cross-opening direction are spaced apart in the opening direction and each have an overlap portion that overlaps with each other when viewed in the opening direction, A packaging material, wherein the plurality of notches constituting the notch group have the same shape and size.

2. 2. The packaging material according to claim 1, wherein the notch group has three or more notches including the first end-side notch and the second end-side notch, and the first end-side notch and the second end-side notch are positioned at the same position in the opening direction.

3. The notches are: an upstream notch group including at least one of the notches; a downstream notch group including at least one notch arranged downstream of the upstream notch group in the opening direction, The packaging material according to claim 1 or 2, wherein at least one of the upstream notch group and the downstream notch group is a parallel notch group including a plurality of the notches arranged in parallel along the cross-opening direction.

4. the number of notches in the upstream group of notches; The wrapping material of claim 3 , wherein the number of notches in the downstream group of notches is different.

5. the number of notches in the upstream group of notches; The packaging material of claim 3 , wherein the number of notches in the downstream notch groups is the same.

6. the upstream notch group includes three of the notches; The packaging material of claim 4 , wherein the downstream notch group includes two of the notches.

7. The packaging material according to any one of claims 1 to 6, wherein the notch has a length extending in the opening cross direction, and both end portions in the length direction are located downstream in the opening direction relative to a center portion in the length direction.

8. The packaging material according to claim 7 , wherein the notch has a shape that is convex on the upstream side in the opening direction and has any one of an arc shape, an inverted V shape, and a trapezoid shape.

9. The packaging material according to any one of claims 1 to 8, wherein the first cutting tape and the second cutting tape have a portion where they intersect with each other.

10. The packaging material according to any one of claims 1 to 9, wherein the protective sheet is disposed on the outer surface of the sheet body.

11. A packaging material described in any one of claims 1 to 10, wherein a pair of strip-shaped sheet portions extending in the opening direction are arranged on at least one of the inner and outer surfaces of the sheet body outside each of the first cutting tape and the second cutting tape.

12. A packaging bag comprising a bag body formed from the sheet body of the packaging material according to any one of claims 1 to 11, and an item to be packaged is accommodated inside the bag body.

13. The packaging bag according to claim 12, wherein the sheet body is folded to form the bag body into a cubic shape.

14. A packaging material roll, comprising a packaging material roll in which the packaging material according to claim 11 is integrated so as to be continuous in the extending direction of the strip-shaped sheet portion and wound into a roll.

Images