Packaging material

Abstract

To provide a packaging material that can be smoothly opened while increasing the width of a band-shaped opening formed by opening.SOLUTION: An opening guide 40 of a sheet body 10 capable of surrounding an article to be packaged has a width corresponding to a dimension in an opening orthogonal direction orthogonal to an opening direction that is at least half of the maximum width dimension orthogonal to the opening direction of a main surface region 16, a protective sheet 30 has a protective part 31 that covers a notch 21 and is adhered to an opening start region 11, and a gripping part 32 that is continuous with the protective part 31 and extends in an opposite side to the opening direction and is not adhered to an outer surface, the gripping part 32 has a base end part 32a at an end part on the protective part 31 side, and a tip end part 32b disposed at approximately a center in a width direction of the gripping part 32 at a position furthest from the protective part 31 in the opposite direction to the opening direction, and regarding the base end part 32a and the tip end 32b, the width corresponding to the dimension in the direction orthogonal to the opening direction is smaller at the tip end part 32b than at the base end part 32a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging material suitable for packaging bulk food products. [Background technology]

[0002] Conventionally, there are known film-like packaging materials that allow block-shaped foods such as rice balls, sandwiches, and cooked bread to be eaten hygienically by hand. For example, Patent Document 1 discloses a packaging material that is opened by forming a gripping piece by cutting a sheet main body that surrounds the packaged item, and by pinching and pulling a protective sheet adhered to the gripping piece in the opening direction to tear the sheet main body from the gripping piece, forming a strip-shaped opening starting from the cut. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-341715 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the packaging material described in the above Patent Document 1, the sheet body is torn along a pair of parallel strip-shaped cut tapes adhered to the sheet body so as to be continuous with the gripping piece, and an opening having a width corresponding to the distance between these cut tapes is formed. By the way, when the width of the opening formed in the sheet body is small, it becomes difficult to expose and eat the food or take out the food from the opening. Therefore, if the width of the cut is increased and the width of the gripping piece is increased, it is possible to widen the opening. However, in that case, the width of the protective sheet that covers and protects the cut also becomes large. When the width of the protective sheet is large, there is a possibility of pinching one end on one side in the width direction of the protective sheet and pulling the protective sheet in the opening direction. In that case, there is a concern that the pulling force acts unevenly on one of the pair of cut tapes, so that the opening is not formed in a normal strip shape or an excessive tearing force is required, and the opening cannot proceed smoothly.

[0005] Therefore, the main object of the present invention is to provide a packaging material that can be smoothly opened while increasing the width of the strip-shaped opening formed by opening.

Means for Solving the Problems

[0006] The packaging material of the present invention surrounds and packages an object to be packaged, has an inner surface facing the object to be packaged and an outer surface on the opposite side of the inner surface, and is provided with a main surface area facing the main surface of the object to be packaged in the packaged state of the object to be packaged. A sheet body, a notch that is disposed in an opening start region set in the sheet body and does not open at the edge of the sheet body, a protective sheet that covers the notch from the side of the outer surface and is disposed in the opening start region, and at least extends along the opening direction from the opening start region. When the protective sheet is moved in the opening direction, the sheet body is torn in the opening direction so that a strip-shaped opening having a predetermined width is formed in at least the main surface region. The packaging material includes an opening guide, and the width of the opening guide corresponding to the dimension in the opening orthogonal direction orthogonal to the opening direction is 1 / 2 or more of the maximum width dimension orthogonal to the opening direction of the main surface region. The protective sheet has a protective portion that covers the notch and is adhered to the opening start region, and a knob portion that continuously extends from the protective portion in the opening opposite direction opposite to the opening direction and is not adhered to the outer surface. The knob portion has a base end portion at the end portion on the protective portion side and a tip end portion disposed substantially at the center in the width direction of the knob portion at a position farthest from the protective portion in the opening opposite direction. The width corresponding to the dimension in the opening orthogonal direction of the base end portion and the tip end portion is smaller at the tip end portion than at the base end portion.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a packaging material that can be smoothly opened while increasing the width of the strip-shaped opening formed by opening.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 8C

Figure 9A

Figure 9B

Figure 10A

Figure 10B

Figure 11A

Figure 11B

Figure 11C

Best Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments will be described with reference to the drawings.

[0010] FIG. 1 is a plan view of the packaging material 1 according to the embodiment as viewed from the outer surface 10b side of the 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. 4 is an enlarged view showing the unsealing start region 11 set in the packaging material 1 and its periphery. FIG. 5 is a perspective view showing a state in which the food 5 as an object to be packaged is packaged with the packaging material 1, and FIG. 6 is a perspective view showing a state in which the packaging material 1 is being unsealed.

[0011] As shown in FIG. 5, for example, the packaging material 1 packages the rectangular food 5 as an object to be packaged by the pushing-up packaging described later.

[0012] As shown in FIGS. 1 to 3, the packaging material 1 according to the embodiment includes a sheet body 10 that forms the main body of the packaging material 1, a protective sheet 30, an unsealing guide 40, and a strip-shaped sheet portion 50. In FIGS. 1 to 3, the length direction of the packaging material 1 and the sheet body 10 is indicated by L, and the width direction is indicated by W. In some cases, the width direction W may be referred to as the left-right direction. In that case, the left-right direction is the left-right direction in FIG. 1.

[0013] As shown in FIGS. 1 to 3, the sheet body 10 is a resin film formed in a rectangular shape having a length direction and a width direction. The sheet body 10 has an inner surface 10a facing the object to be packaged and an outer surface 10b on the side opposite to the inner surface 10a. The sheet body 10 has a shape and size capable of surrounding the entire surface of the object to be packaged. Note that the sheet body 10 is not limited to a rectangular shape, and may be a square shape in which the dimensions in the length direction and the width direction are equal.

[0014] At a central portion in the width direction of the sheet body 10 and at a predetermined position on one end side in the length direction (the upper end side in FIG. 1), a rectangular opening start region 11 is set. In the opening start region 11 of the sheet body 10, a notch group 20 including a plurality of notches 21 is arranged. 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 opens to the edge 10e of the four sides of the sheet body 10.

[0015] The opening guide 40 includes a first cut tape 41 and a second cut tape 42. The first cut tape 41 passes through one end portion in the width direction of the opening start region 11 (the left end portion in FIG. 1). The second cut tape 42 passes through the other end portion in the width direction of the opening start region 11 (the right end portion in FIG. 1). The first cut tape 41 and the second cut tape 42 are arranged in parallel with the length direction of the sheet body 10 and extend over the entire length in the length direction of the sheet body 10. The first cut tape 41 and the second cut tape 42 are arranged on the inner surface 10a of the sheet body 10. The first cut tape 41 and the second cut tape 42 are adhered to the inner surface 10a of the sheet body 10 by means such as ultrasonic sealing, heat sealing, or adhesive application.

[0016] Note that each of the first cut tape 41 and the second cut tape 42 may be arranged on the outer surface 10b of the sheet body 10, or may be arranged sandwiching the sheet body 10 between the inner surface 10a and the outer surface 10b.

[0017] The sheet body 10 is torn and opened from the opening start region 11 along the length direction, which is the extending direction of the first cut tape 41 and the second cut tape 42, in the direction of the other end side (the lower side in FIG. 1) opposite to the opening start region 11 in the length direction. The arrow M in FIG. 1 indicates the tearing direction of the sheet body 10, that is, the opening direction. Further, the arrow M1 indicates the upstream side of the opening direction, and the arrow M2 indicates the downstream side of the opening direction.

[0018] The first cut tape 41 and the second cut tape 42 are spaced apart in the width direction of the sheet body 10, which is the opening orthogonal direction orthogonal to the opening direction, and extend parallel to each other along the opening direction. As shown in FIG. 1, the first cut tape 41 has an outer edge 41a on the outer side in the width direction and an inner edge 41b on the inner side in the width direction. The second cut tape 42 has an outer edge 42a on the outer side in the width direction and an inner edge 42b on the inner side in the width direction. Each edge 41a, 41b, 42a, 42b extends along the opening direction. The outer edges 41a, 42a of each cut tape 41, 42 constitute an opening guide line that guides the tearing of the sheet body 10. That is, each outer edge 41a, 42a is an example of the opening guide line of the present disclosure that guides the tearing of the sheet body 10. The separation distance between each outer edge 41a, 42a corresponds to the width of the opening guide 40.

[0019] The plurality of notches 21 constituting the notch group 20 have the same shape and size. The notch 21 of the embodiment has a bilaterally symmetric arc shape that gently protrudes upstream in the opening direction, as shown in FIG. 4. One notch 21 generally extends in the width direction of the sheet body 10.

[0020] The notch group 20 having 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 parallel in the width direction of the sheet body 10. The downstream notch group 20B includes a plurality of second notches 21B arranged in parallel in the width direction of the sheet body 10. The downstream notch group 20B is arranged downstream in the opening direction away from the upstream notch group 20A. Hereinafter, when there is no need to particularly distinguish between the first notch 21A and the second notch 21B, these notches 21A, 21B may be collectively referred to simply as the notch 21.

[0021] The upstream notch group 20A 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 this interval is, for example, about 1 / 10 to 9 / 10 of the length direction of the first notch 21A.

[0022] The downstream notch group 20B is a parallel notch group having two second notches 21B arranged at intervals in the width direction of the sheet body 10. The interval in the width direction between the two second notches 21B is the same as the interval between each of the first notches 21A of the upstream notch group 20A. Each of the two second notches 21B of the downstream notch group 20B is arranged between each of the first notches 21A of the upstream notch group 20A when viewed in the opening direction which is the length direction of the sheet body 10. The position at the center in the length direction of each second notch 21B of the downstream notch group 20B and the intermediate position between adjacent first notches 21A of the upstream notch group 20A are aligned in the width direction.

[0023] The downstream notch group 20B is arranged at a distance of, for example, about 1 mm to 20 mm from the upstream notch group 20A on the downstream side in the opening direction.

[0024] When the five notches 21, namely, the three first notches 21A of the upstream notch group 20A and the two second notches 21B of the downstream notch group 20B, are viewed in plan view, these five notches 21 are arranged in a staggered pattern side by side from one end side to the other end side in the width direction of the sheet body 10 while being alternately shifted between one end side and the other end side in the length direction of the sheet body 10. Therefore, the three first notches 21A on the upstream notch group 20A side and the two second notches 21B of the downstream notch group 20B are adjacent to each other in the width direction of the sheet body 10. That is, they are arranged in the order of the first notch 21A, the second notch 21B, the first notch 21A, the second notch 21B, the first notch 21A from left to right. A pair of adjacent first notch 21A and second notch 21B in the width direction of the sheet body 10 have overlapping portions when viewed in the length direction of the sheet body 10.

[0025] Of the three first notches 21A of the upstream notch group 20A, the left first notch 21A intersects the first cut tape 41, and the right first notch 21A intersects the second cut tape 42. In the following, the first notch 21A that intersects the first cut tape 41 may be referred to as the first end-side notch 21A1, and the first notch 21A that intersects the second cut tape 42 may be referred to as the second end-side notch 21A2. In the length direction of the sheet body 10, the first end-side notch 21A1 and the second end-side notch 21A2 are arranged at the same position as each other. That is, the positions of the first end-side notch 21A1 and the second end-side notch 21A2 are aligned in the length direction of the sheet body 10.

[0026] In the first end-side notch 21A1, a portion on the left side of the center in its own length direction intersects the first cut tape 41. In the second end-side notch 21A2, a portion on the right side of the center in its own length direction intersects the second cut tape 42. The first cut tape 41 is disposed inside (on the side of the second cut tape 42) of the left end 24a of the first end-side notch 21A1. The second cut tape 42 is disposed inside (on the side of the first cut tape 41) of the right end 24f of the second end-side notch 21A2.

[0027] By forming each first notch 21A of the upstream notch group 20A, each of the mountain-shaped portions on the downstream side in the opening direction of these first notches 21A has become the first opening piece 25A. By forming each second notch 21B of the downstream notch group 20B, each of the mountain-shaped portions on the downstream side in the opening direction of these second notches 21B has become the second opening piece 25B.

[0028] As described above, each notch 21 of the notch group 20 of the present embodiment has the same shape and size, and the intervals between the notches 21 arranged in the width direction are also the same. However, the shapes and sizes of the respective notches 21 may be different, and the intervals in the width direction may also be different.

[0029] The protective sheet 30 is a polygonal film that is long in the width direction of the sheet body 10. A part of the protective sheet 30 is adhered to the outer surface 10b of the sheet body 10. Each of the above-described unsealing pieces 25A and 25B is turned to the outer surface 10b side via the protective sheet 30.

[0030] As shown in FIG. 4, the protective sheet 30 includes a protection part 31 and a grip part 32. The protection part 31 covers the notch group 20 and is adhered to the outer surface 10b. The protection part 31 is adhered by an adhesive to a rectangular area including the formation area of the notch group 20 and a portion around the formation area of the notch group 20. The adhesion area of the protection part 31 is substantially equal to the unsealing start area 11. The entire area of the protection part 31 is adhered to the outer surface 10b, and all the notches 21 of the notch group 20 are blocked by this protection part 31. Therefore, all the notches 21 are separated from the outside by the protection part 31.

[0031] The grip part 32 is a part that continuously extends from the protection part 31 in the unsealing opposite direction, which is the opposite side of the unsealing direction, that is, the upstream side in the unsealing direction. The grip part 32 is not adhered to the outer surface 10b and can be gripped by a finger and turned to the outer surface 10b side.

[0032] The grip part 32 has a symmetric trapezoidal shape whose width gradually decreases as it goes upstream in the unsealing direction from the protection part 31. The grip part 32 has a base end part 32a at the end on the protection part 31 side and a tip end part 32b whose width is smaller than that of the base end part 32a. The edge on the protection part 31 side at the base end part 32a has the same width as the protection part 31. The tip end part 32b is at the position farthest upstream in the unsealing direction from the protection part 31 and forms the top of the trapezoidal shape. The tip end part 32b is disposed substantially at the center in the width direction of the grip part 32. The edge 32c on both sides in the width direction of the grip part 32 from the base end part 32a to the tip end part 32b is inclined at the same angle θ with respect to the length direction of the sheet body 10. The inclination angle θ formed by this edge 32c and the length direction is, for example, about 10° or more and 80° or less.

[0033] As shown in FIG. 4, the width W2 of the edge of the tip 32b of the gripping portion 32 is smaller than the width of the opening guide 40, that is, the separation distance G1 between the outer edge 41a of the first cut tape 41 and the outer edge 42a of the second cut tape 42. Further, the width W2 of the tip 32b of the gripping portion 32 is smaller than the separation distance G2 between the inner edge 41b of the first cut tape 41 and the inner edge 42b of the second cut tape 42.

[0034] Also, the width W1 of the base end portion 32a of the gripping portion 32 is larger than the separation distance G1 between the outer edge 41a of the first cut tape 41 and the outer edge 42a of the second cut tape 42.

[0035] Note that the width of the protective sheet 30, that is, the width of the protective portion 31 may be, for example, a dimension of 10 mm or more and 100 mm or less, preferably 20 mm or more and 80 mm or less, and more preferably 30 mm or more and 70 mm or less. Each of both ends in the width direction of the protective portion 31 protrudes outward in the width direction from the opening guide 40, and the interval 31w between the opening guide 40 and the edge 31a of the protective portion 31, which is the amount of protrusion, is preferably 1 mm or more and 10 mm or less on one side, and preferably 2 mm or more and 20 mm or less in total for both sides. Also, both ends in the width direction of the notch group 20, that is, the left end 24a of the first end side notch 21A1 and the right end 24f of the second end side notch 21A2 are each located inside both end edges 31a in the width direction of the protective portion 31. Each of these ends 24a, 24f is preferably arranged, for example, 1 mm or more inside from the edge 31a of the protective portion 31.

[0036] As shown in FIGS. 1 to 3, a pair of strip-shaped sheet portions 50 extending in the length direction of the sheet body 10 are arranged on the inner surface 10a of the sheet body 10. The pair of strip-shaped sheet portions 50 includes a first strip-shaped sheet portion 51 arranged at a predetermined distance outward in the width direction of the sheet body 10 from the first cut tape 41, and a second strip-shaped sheet portion 52 arranged at a predetermined distance outward in the width direction from the second cut tape 42. These strip-shaped sheet portions 51 and 52 are substantially parallel to the respective cut tapes 41 and 42. Each of the strip-shaped sheet portions 51 and 52 is adhered to the inner surface 10a of the sheet body 10 by means such as ultrasonic sealing, heat sealing, or adhesive application.

[0037] By arranging a pair of strip-shaped sheet portions 50 extending in the length direction of the sheet body 10 on the inner surface 10a of the sheet body 10 in this way, it is easy to make the widthwise thickness of the packaging material 1 uniform as a whole. The sheet body 10 is often obtained by cutting out a large number from a roll-shaped raw fabric. When each of the pair of strip-shaped sheet portions 50 is continuous in the roll-shaped state, it is possible to suppress winding defects due to thickness deviation.

[0038] Note that 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 body 10, or may be arranged sandwiching the sheet body 10 between both the inner surface 10a and the outer surface 10b. Further, the strip-shaped sheet portion 50 is arranged as needed, and in some cases, the equipment may be omitted.

[0039] The sheet body 10, the protective sheet 30, each cut tape 41, 42, and each strip sheet part 51, 52 are made of a flexible transparent or translucent synthetic resin film, a transparent metal vapor deposition film, or the like. The resin film preferably has heat weldability in terms of facilitating heat sealing. As the resin film, a single-layer or multi-layer synthetic resin film is used. In the case of a single layer, for example, it is a synthetic resin film such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. In the case of a multi-layer, for example, a synthetic resin film such as polypropylene containing a PVDC (polyvinylidene chloride) coat that serves as a moisture barrier layer can be used. Specifically, OPP (biaxially oriented polypropylene), CPP (unoriented polypropylene), etc. are preferably used. Note that at least one of the sheet body 10, the protective sheet 30, each cut tape 41, 42, and each strip sheet part 51, 52 may be made of a material other than the above resin film, such as paper or non-woven fabric.

[0040] The thicknesses of the resin films forming the sheet body 10, the protective sheet 30, each cut tape 41, 42, and each strip sheet part 51, 52 may be the same. However, for the protective sheet 30, it is desirable to use a relatively thick and firm one so that the gripping part 32 that is pinched by fingers during opening does not tear. Also, the sheet body 10 desirably has a thickness that maintains the packaging state and is easily torn during opening. The thickness of each strip sheet part 51, 52 is preferably greater than the thickness of each cut tape 41, 42.

[0041] The packaging material 1 packages the food 5, for example, as shown in FIG. 5, by so-called push-up packaging, in which the rectangular parallelepiped-shaped food 5 as the object to be packaged is pressed against the substantially center of the inner surface 10a of the sheet body 10, and the packaging material 1 is deformed along the outer shape of the food 5 and wrapped. Examples of the food 5 include cooked rice formed in a rectangular parallelepiped shape, etc., but it is not limited thereto. For example, lump-shaped foods such as onigiri, sandwiches, and cooked bread can be packaged by the packaging material 1.

[0042] The packaging material 1 for packaging the food 5 has, for example, the sheet body 10 folded on the back side of the food 5 to seal or close the food 5 from the outside, and for example, a label for displaying a tape, nutritional components, etc. is pasted, or by heat sealing, or after heat sealing, a tape or the like is pasted on the surface thereof, thereby maintaining the packaged state. Alternatively, the portion folded on the back side of the packaging material 1 may be adhered by heat sealing to maintain the sealed state. Also in this case, after heat sealing, a tape or the like may be pasted on the surface thereof.

[0043] The packaging material 1 for packaging the food 5 is in a state where the length direction of the sheet body 10 is substantially parallel to the length direction of the food 5. The packaging material 1 in the state of packaging the food 5 is formed in a three-dimensional shape substantially the same as that of the food 5. Thereby, the sheet body 10 is provided with a main surface region 16, a back surface region 17 facing substantially parallel to the main surface region 16 with the food 5 interposed therebetween, and four side surfaces 18 connecting the main surface region 16 and the back surface region 17. The main surface region 16 is a region that faces and covers the main surface 5a, which is one of the largest flat surfaces of the food 5. On the outer surface 10b of the main surface region 16, for example, a product name or the like may be displayed by means such as label pasting or printing. The back surface region 17 is a region that faces and covers the back surface 5b on the back side of the main surface 5a of the food 5. The four side surfaces 18 are surfaces that are continuous with the main surface region 16 and the back surface region 17 at a substantially right angle, and cover the four side surfaces 5c of the food 5.

[0044] In the packaged state shown in FIG. 5, a protective sheet 30 adhered to the outer surface 10b of the sheet body 10 is disposed on one side surface 18 in the length direction (particularly, in FIG. 5, particularly denoted by reference numeral 18a). The notch group 20 of the sheet body 10 is disposed on this side surface 18a. The protective sheet 30 has the entire region of the protective portion 31 covering the notch group 20 disposed along the side surface 18a, and a part including the base end portion 32a of the knob portion 32 is also disposed on the side surface 18a. The tip end portion 32b of the knob portion 32 protrudes outside (lower side in FIG. 5) from the back surface region 17. The width of the protective portion 31 is substantially equal to the width of the side surface 18a, and the tip end portion 32b of the knob portion 32 is disposed substantially at the center in the width direction of the side surface 18a.

[0045] As shown in FIG. 5, in the packaging material 1 that packages the food 5, in the main surface area 16 of the sheet body 10, an opening guide 40 (the first cut tape 41 and the second cut tape 42) extending downstream in the opening direction from the protective sheet 30 extends in the length direction. The opening guide 40 extends substantially parallel to the side surface 5c extending along the opening direction of the rectangular parallelepiped-shaped food 5 packaged by the packaging material 1. The opening guide 40 extends substantially parallel to the side surface 18 extending along the opening direction of the packaging material 1 in a state where the rectangular parallelepiped-shaped food 5 is packaged. The opening guide 40 is disposed at the center in the width direction of the main surface area 16. The separation distance G1 between the outer edge 41a of the first cut tape 41, which is the width of the opening guide 40, and the outer edge 42a of the second cut tape 42 has a value of 1 / 2 or more of the maximum width dimension of the main surface area 16. In this case, since the width of the main surface area 16 is substantially constant, it can be said to be the width of the main surface area 16. The width of the opening guide 40 only needs to be 1 / 2 or more of the maximum width dimension of the main surface area 16. For example, it is more preferable that it is 70% or more, or 80% or more of the maximum width dimension of the main surface area 16, or it may be 100%. In the case of 100%, the width of the opening guide 40 becomes the entire width of the main surface area 16.

[0046] When the packaging material 1 of the embodiment turns up the gripping portion 32 of the protective sheet 30 and pulls the gripping portion 32 in the opening direction toward the protective portion 31 indicated by the arrow M in FIGS. 5 and 6, as shown in FIG. 6, the central portion in the width direction of the sheet body 10 is torn to form a strip-shaped opening 13, and it is opened. Note that the opening direction on the side surface 18a where the protective portion 31 is disposed is the upper side on the main surface area 16 side as viewed from the side surface 18a in FIGS. 5 and 6.

[0047] When the gripping portion 32 of the protective sheet 30 is gripped and pulled in the opening direction, the protective portion 31 peels off from the outer surface 10b of the sheet body 10. Then, when the protective sheet 30 is continuously pulled in the opening direction, a plurality of opening pieces 25A, 25B adhered to the protective portion 31 peeled off from the outer surface 10b follow the protective portion 31 and are turned up. When the plurality of opening pieces 25A, 25B are turned up by the protective sheet 30 in this way, as shown in FIG. 4, cuts 12a, 12f extending in the opening direction are generated from the left end 24a of the left side of the first end side notch 21A1 and the right end 24f of the right side of the second end side notch 21A2, respectively. These left and right cuts 12a, 12f are formed outside the respective cut tapes 41, 42. At the same time, a plurality of cuts 12b generated in the opening direction from the ends of each of the first notches 21A of the upstream side notch group 20A other than the respective ends 24a, 24f reach the second notches 21B of the downstream side notch group 20B.

[0048] As a result, the three first notches 21A and the two second notches 21B are continuous via a plurality of cuts 12b. From this state, when the protective sheet 30 is further pulled in the opening direction, three first opening pieces 25A formed by the three first notches 21A and two second opening pieces 25B formed by the two second notches 21B, which are on the downstream side of the upstream side notch group 20A, are turned up as one united opening piece.

[0049] When the gripping portion 32 is further pulled, the sheet body 10 between the left and right cuts 12a, 12f is torn in the opening direction starting from the united opening piece described above. As a result, as shown in FIG. 6, an opening is formed in a band shape between the left and right cuts 12a, 12f. That is, a band-shaped opening 13 is formed.

[0050] When the opening 13 extends in the opening direction, a strip-shaped opening 13 is formed from the side surface 18a to the main surface region 16 of the sheet body 10, and thereby the packaging material 1 is opened. When the packaging material 1 is opened in this way, for example, the food 5 can be eaten from the opening 13 in a state where the food 5 is grasped through the sheet body 10, or the food 5 can be taken out from the opening 13. In the present embodiment, since the sheet body 10 covers the food 5, when the gripping portion 32 of the protective sheet 30 is pulled and the sheet body 10 is torn in the opening direction, the food 5 is exposed.

[0051] 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 cut tape 41 is disposed near the inside of the cut 12a, and the second cut tape 42 is disposed near the inside of the cut 12f. Here, even if the cut 12a progresses in the opening direction while being deflected inward, the cut 12a hits the outer edge 41a of the first cut tape 41 and does not cut further inward, but progresses along the outer edge 41a of the first cut tape 41. Further, even if the cut 12f progresses in the opening direction while being deflected inward, the cut 12f hits the outer edge 42a of the second cut tape 42 and does not cut further inward, but progresses along the outer edge 42a of the second cut tape 42. Thereby, the pair of left and right cuts 12a, 12f formed on both sides of the first cut tape 41 and the second cut tape 42 do not disappear, and the opening 13 with a certain width can be formed while completing the opening. The first cut tape 41 and the second cut tape 42 may be continuously arranged in parallel from the main surface region 16 to the side surface 18 and the back surface region 17. Thereby, since the cut continuously progresses from the main surface region 16 to the side surface 18 and the back surface region 17, it becomes easier to eat the food 5 from the opening 13 in a state where the food 5 is grasped through the sheet body 10. Also, it becomes easier to take out the food 5 from the opening 13.

[0052] FIG. 7 is a plan view of the packaging material 1 showing a state in which an opening 13 is formed in the main surface area 16 of the packaging material 1 that wraps the food 5. In the packaging material 1 of the embodiment that is opened by tearing the sheet body 10 as described above to form the opening 13 in the main surface area 16, the width of the opening 13 corresponds to the width of the opening guide 40 and has at least 1 / 2 of the maximum width dimension of the main surface area 16. Therefore, the opening 13 has a large width. For example, when eating the food 5 exposed from the opening 13 together with the packaging material 1 by hand, it is easy to eat the food 5. Also, when taking out the food from the opening 13, it is easy to take out because the width of the opening 13 is large. Incidentally, when eating the food 5 in this way, in some cases, the sheet body 10 covering the side surfaces 18 on both sides in the length direction is removed from the food 5 to make it easier to eat.

[0053] The opening guide 40 of the embodiment is composed of a pair of left and right cut tapes 41 and 42. Therefore, by adjusting the separation distance between these cut tapes 41 and 42, the width of the opening guide 40, that is, the width of the opening 13 can be easily adjusted.

[0054] Also, when opening the packaging material 1, the gripping portion 32 of the protective sheet 30 is gripped with fingers and the protective sheet 30 is pulled in the opening direction. The gripping portion 32 has a trapezoidal shape, and its tip portion 32b is narrower than the base end portion 32a and protrudes at the center in the width direction of the protective sheet 30. Thus, when gripping the gripping portion 32 with fingers, it is easy to grip the tip portion 32b, and if the tip portion 32b is gripped, the center in the width direction of the protective sheet 30 will naturally be gripped. When the center in the width direction of the protective sheet 30 is gripped in this way and the protective sheet 30 is pulled in the opening direction, the pulling force is transmitted straight from the protective sheet 30 toward the center in the width direction of the sheet body 10. For this reason, the tearing force that forms the cut lines 12a and 12f generated from the notch group 20 and formed along the left and right cut tapes 41 and 42, respectively, is transmitted to the sheet body 10 evenly without being biased to either the left or the right. As a result, the cut lines 12a and 12f smoothly progress in the opening direction in balance at almost the same pace. For example, if the tearing force is biased and loaded on either one of the left and right cut tapes 41 and 42, an excessive tearing force will be required due to the resistance of that cut tape, and there is a possibility that the opening will not proceed smoothly. However, in the embodiment, such a situation is unlikely to occur.

[0055] In the opening 13 formed in the sheet body 10 by the above opening action, as shown in FIG. 6, the opening end 13a, which is the start end of the opening 13, is formed on the side surface 18a of the sheet body 10. The opening end 13a has a shape corresponding to the plurality of notches 21 that make up the notch group 20. By forming the opening end 13a on the side surface 18a in this way, the opening 13 is formed not only in the main surface region 16 side but also in a part of the side surface 18a. Therefore, the opening 13 can be made larger than when it is formed only on the main surface region 16 side. As a result, it becomes even easier to eat or take out the food 5.

[0056] Also, when the main surface area 16 is viewed in plan view, since the protective sheet 30 does not protrude outside the main surface area 16, the protective sheet 30 does not get in the way when carrying it by hand or storing it in a bag or the like. Further, since the protective sheet 30 is not disposed on the main surface area 16 and the entire main surface area 16 is exposed to the outside, when the sheet body 10 is transparent or translucent, the food 5 is not hidden by the protective sheet 30 and the whole food 5 can be visually observed while being packaged.

[0057] As described above, in the packaging material 1 for packaging the food 5, the sheet body 10 may be folded on the back side of the food 5, and the folded portion may be adhered and folded and sealed to maintain the packaged state. FIGS. 8A to 8C show the steps of pushing up and packaging the food 5 and folding and sealing the end portion of the sheet body 10 on the back surface 5b side opposite to the main surface 5a, and all show the back side of the food 5 and the sheet body 10. FIG. 8A shows the first stage of the process, in which the food 5 and the sheet body 10 are aligned in the length direction, the sheet body 10 is brought into close contact with the main surface 5a (the back side of the paper surface in FIG. 8A) of the food 5, the sheet body 10 is longitudinally folded along the length direction, and both end portions in the width direction of the sheet body 10 are overlapped with each other on the back side of the food 5. Both end portions on the length direction sides of the sheet body 10 protrude from the food 5 respectively, and surplus rectangular tube-shaped folded portions 19 are formed. Next, as shown in FIG. 8B, the folded portions 19 are appropriately folded on the back surface 5b side of the food 5 to form three-dimensional folded portions 19a, and then, as shown in FIG. 8C, the folded portions 19a are folded and flat folded portions 19b are overlapped on the back surface area 17 of the sheet body 10. After that, the folded portion 19b is adhered to the back surface area 17 of the sheet body 10 by means such as adhesion, seal sticking, sticking of a label for displaying tape, nutritional components, etc., or heat sealing, and the packaging by the packaging material 1 is completed.

[0058] Here, in an embodiment where the tip 32b of the gripping portion 32 of the protective sheet 30 protrudes outside the back surface region 17, the folding portion 19b may interfere with the tip 32b and draw the tip 32b into the back surface side. However, since the tip 32b of the gripping portion 32 is formed in a trapezoidal shape and both sides in the width direction are cut so that the edge 32c is inclined, it is difficult for the folding portion 19b to interfere with the tip 32b of the gripping portion 32 when folding and sealing. For this reason, it is possible to prevent the tip 32b from being drawn into the back surface 5b side by the folding portion 19b. If the gripping portion 32 is drawn into the back surface 5b side, a simple and appropriate packaging state cannot be obtained, but such a situation can be avoided in the embodiment. In FIGS. 8B and 8C, in order to show a state where the tip 32b of the gripping portion 32 is not drawn into the back surface 5b side by the folding portion 19b, the tip 32b is shown in a state of being folded toward the back surface 5b side, but actually the tip 32b is along the side surface 18a.

[0059] The protective sheet 30 is not limited to being disposed on the side surface 18a with respect to the sheet body 10. FIG. 9A shows a plan view of the packaging material 1 in a state where the food 5 is packaged and the protective sheet 30 is disposed at one end in the length direction of the main surface region 16. In this case, the tip 32b of the gripping portion 32 extends continuously from the main surface region 16 of the sheet body 10 substantially along the plane direction of the main surface region 16 and protrudes outside the side surface 18a (upper side in FIG. 9A). The notch group 20 is disposed at one end in the length direction of the main surface region 16 close to the side surface 18a.

[0060] When the packaging material 1 is opened when the protective sheet 30 is disposed as shown in FIG. 9A, as shown in FIG. 9B, since the opening end 13a of the opening 13 is close to the side surface 18a, the opening 13 is formed over substantially the entire length of the main surface region 16. Therefore, it becomes easier to eat or take out the food 5. Also, in this embodiment as well, as described above, it is possible to prevent the tip 32b of the gripping portion 32 from being drawn into the back surface side when performing corner folding packaging on the back surface side.

[0061] As shown in Fig. 10A, in the state where the food 5 is packaged, the protective sheet 30 is disposed at one end in the length direction of the main surface area 16, and the tip 32b of the gripping portion 32 does not protrude outward from the side surface 18a and is substantially flush with the side surface 18a, and overlaps the main surface area 16 of the sheet body 10.

[0062] When the packaging material 1 is opened in the case where the protective sheet 30 is disposed as shown in Fig. 10A, as shown in Fig. 10B, the opening end 13a of the opening 13 is formed at a position away from the side surface 18a, and a remaining portion 16a in which a part of the sheet body 10 remains is formed between the opening end 13a and the side surface 18a in the main surface area 16. According to the mode in which the remaining portion 16a is formed in the main surface area 16 in this way, spillage and dropping of the food 5 are suppressed by the remaining portion 16a. If the food 5 is grasped using this remaining portion 16a, the food 5 can be quickly eaten in the opened state as it is.

[0063] According to the embodiment described above, the following effects are achieved.

[0064] (1) The packaging material 1 according to the embodiment surrounds and packages the object to be packaged (food 5), has an inner surface 10a facing the object to be packaged and an outer surface 10b on the side opposite to the inner surface 10a, and a main surface region 16 provided to face the main surface 5a of the object to be packaged in the packaged state of the object to be packaged. The packaging material 1 includes a sheet body 10, a notch 21 disposed in an opening start region 11 set in the sheet body 10 and not opening to the edge 10e of the sheet body 10, a protective sheet 30 disposed in the opening start region 11 covering the notch 21 from the side of the outer surface 10b, and an opening guide 40 extending at least along the opening direction from the opening start region 11. When the protective sheet 30 is moved in the opening direction, the sheet body 10 is torn in the opening direction so that a strip-shaped opening 13 having a predetermined width is formed at least in the main surface region 16. The width of the opening guide 40 corresponding to the dimension in the opening orthogonal direction orthogonal to the opening direction has at least 1 / 2 of the maximum width dimension orthogonal to the opening direction of the main surface region 16. The protective sheet 30 has a protective portion 31 adhered to the opening start region 11 covering the notch 21, and a grip portion 32 continuously extending from the protective portion 31 in the opening opposite direction opposite to the opening direction and not adhered to the outer surface 10b. The grip portion 32 has a base end portion 32a at the end portion on the protective portion 31 side and a tip end portion 32b disposed substantially at the center in the width direction of the grip portion 32 at the position farthest from the protective portion 31 in the opening opposite direction. The width corresponding to the dimension in the opening orthogonal direction of the base end portion 32a and the tip end portion 32b is smaller at the tip end portion 32b than at the base end portion 32a.

[0065] Thereby, while being able to increase the width of the strip-shaped opening 13 formed in the sheet body 10 by opening, it is possible to open smoothly.

[0066] (2) In the packaging material 1 of the above (1) according to the embodiment, the opening guide 40 is spaced apart in the opening orthogonal direction and extends parallel to each other along the opening direction, and includes the outer edges 41a, 42a of the left and right cut tapes 41, 42 as a pair of opening guiding lines for guiding the tearing of the sheet body 10. The separation interval G1 of the outer edges 41a, 42a forming the width of the opening guide 40 has at least 1 / 2 of the maximum width dimension orthogonal to the opening direction of the main surface region 16.

[0067] This allows the width of the strip-shaped opening 13 formed in the sheet body 10 by opening to be increased. Further, by adjusting the separation distance between the pair of left and right cut tapes 41 and 42, the width of the opening 13 corresponding to the width of the opening guide 40 can be easily adjusted.

[0068] (3) In the packaging material 1 according to the above (1) or (2) of the embodiment, in a state where the object to be packaged is packaged, the tip portion 32b of the gripping portion 32 is disposed on the side surface 18 of the sheet body 10 that is continuous with the main surface region 16, or continuously extends from the side surface 18 substantially along the surface direction of the side surface 18, and is preferably disposed in a state of protruding outward from the back surface region 17 facing the main surface region 16 with respect to the side surface 18.

[0069] This suppresses the tip portion 32b of the gripping portion 32 from being caught on the back surface side when performing corner folding packaging on the back surface side.

[0070] (4) In the packaging material 1 according to the above (1) or (2) of the embodiment, in a state where the object to be packaged is packaged, the tip portion 32b of the gripping portion 32 may be disposed so as to continuously extend from the main surface region 16 of the sheet body 10 substantially along the surface direction of the main surface region 16 and protrude outward from the side surface 18 continuous with the main surface region 16.

[0071] This allows the length of the opening 13 formed in the main surface region 16 to be increased. Further, the tip portion 32b of the gripping portion 32 is suppressed from being caught on the back surface side when performing corner folding packaging on the back surface side.

[0072] (5) In the packaging material 1 according to the above (1) or (2) of the embodiment, in a state where the object to be packaged is packaged, the tip portion 32b of the gripping portion 32 may overlap the main surface region 16 of the sheet body 10.

[0073] As a result, a remaining portion 16a in which a part of the sheet body 10 remains is formed in the main surface region 16. By having this remaining portion 16a, spillage and dropping of the object to be packaged are suppressed.

[0074] (6) In the packaging material 1 according to the above (1) to (5) embodiments, it is preferable that the width of the tip portion 32b of the grip portion 32 is smaller than the width of the opening guide 40.

[0075] Thereby, when pulling the tip portion 32b of the grip portion 32 to pull the protective sheet 30 in the opening direction, the possibility of gripping the central portion in the width direction of the protective sheet 30 becomes higher, and as a result, the packaging material 1 can be smoothly opened.

[0076] (7) In the packaging material 1 according to the above (6) embodiments, it is further preferable that the width of the base end portion 32a of the grip portion 32 is larger than the width of the opening guide 40.

[0077] Thereby, the cut lines 12a and 12f generated when tearing the sheet body 10 by the protective sheet 30 are surely generated outside the opening guide 40, that is, outside each cut tape 41 and 42. Therefore, the cut lines 12a and 12f can be smoothly guided in the opening direction by the opening guide 40 to form a normal opening 13.

[0078] As described above, the packaging material 1 according to the embodiments and each modification based on the embodiments have been described. However, the present invention is not limited to these embodiments and modifications, and can be appropriately changed.

[0079] For example, the shape of the grip portion 32 of the protective sheet 30 is not limited to a trapezoidal shape. FIGS. 11A to 11C respectively show modification examples of the shape of the grip portion 32.

[0080] The tab portion 32 shown in Fig. 11A has a mountain shape that converges to the center in the width direction while gradually decreasing in width as it moves away from the protection portion 31, and the width of the tip portion 32b that forms the top of the mountain is smaller than that of the base end portion 32a. The tab portion 32 shown in Fig. 11B has a mountain shape in which the width gradually decreases as the base end portion 32a moves away from the protection portion 31, and a tip portion 32b with a uniform width and a smaller width than the base end portion 32a protrudes and is formed at the top thereof. The tab portion 32 shown in Fig. 11C has an arc shape that converges to the center in the width direction while gradually decreasing in width as it moves away from the protection portion 31, and the width of the tip portion 32b that forms the top of the arc is smaller than that of the base end portion 32a. In any of the tab portions 32, similar to the above-described embodiment, it has a function that enables a smooth opening operation.

[0081] For example, the shape of the notch is arbitrary. The notch may be a single notch formed in an inverted U shape that protrudes upstream in the opening direction and is arranged across the first cut tape 41 to the second cut tape 42.

[0082] The opening guide 40 may be composed of two cut tapes 41 and 42 as in the above-described embodiment, or may be composed of a single wide tape. In the case of a single wide tape, the edges at both ends in the width direction of the tape serve as opening guide lines.

Explanation of Reference Numerals

[0083] 1 Packaging material 5 Food (Packaged item) 5a Main surface of food (Main surface of packaged item) 10 Sheet body 10a Inner surface of sheet body 10b Outer surface of sheet body 10e Edge of sheet body 11 Opening start region 13 Opening 16 Main surface region 17 Back surface region 18 Side surface 21 Notch 30 Protection sheet 31 Protection portion 32 Knob portion 32a Base end portion of the knob portion 32b Tip end portion of the knob portion 40 Opening guide 41a Outer edge of the first cut tape (opening guide line) 42a Outer edge of the second cut tape (opening guide line) G1 Spacing between the opening guide lines

Claims

1. A sheet body that surrounds and packages an object to be packaged, has an inner surface facing the object to be packaged and an outer surface on the opposite side of the inner surface, and is provided with a main surface region facing the main surface of the object to be packaged in a packaged state of the object to be packaged; A notch that is disposed in an opening start region set in the sheet body and does not open at the edge of the sheet body; A protective sheet that is disposed in the opening start region covering the notch from the side of the outer surface; An opening guide that extends at least along the opening direction from the opening start region, and when the protective sheet is moved in the opening direction, the sheet body is torn in the opening direction to form a strip-shaped opening with a predetermined width in at least the main surface region. A packaging material comprising: The width of the opening guide, which corresponds to the dimension in the opening orthogonal direction orthogonal to the opening direction, has at least 1 / 2 of the maximum width dimension orthogonal to the opening direction of the main surface region; The protective sheet has a protective portion that is adhered to the opening start region covering the notch, and a grip portion that continuously extends from the protective portion in the opening opposite direction opposite to the opening direction and is not adhered to the outer surface; The grip portion has a base end portion at the end portion on the protective portion side and a tip end portion disposed substantially at the center in the width direction of the grip portion at a position farthest from the protective portion in the opening opposite direction. The width corresponding to the dimension in the opening orthogonal direction of the base end portion and the tip end portion is smaller at the tip end portion than at the base end portion. Packaging material.

2. The opening guide is spaced apart in the opening orthogonal direction and extends parallel to each other along the opening direction, and includes a pair of opening guiding lines that guide the tearing of the sheet body; The separation interval between the pair of opening guiding lines that form the width of the opening guide has at least 1 / 2 of the maximum width dimension orthogonal to the opening direction of the main surface region. The packaging material according to Claim 1.

3. In a state where the object to be packaged is packaged, the tip end portion of the grip portion is disposed on the side surface of the sheet body that is continuous with the main surface region, or continuously extends substantially along the surface direction of the side surface from the side surface, and protrudes outward from the back surface region facing the main surface region from the side surface. The packaging material according to Claim 1 or Claim 2.

4. In a state where the object to be packaged is packaged, the tip of the gripping portion extends continuously from the main surface region of the sheet body substantially along the surface direction of the main surface region, and is disposed in a state of protruding outward from the side surface continuous with the main surface region. The packaging material according to claim 1 or claim 2.

5. In a state where the object to be packaged is packaged, the tip of the gripping portion overlaps the main surface region of the sheet body. The packaging material according to claim 1 or claim 2.

6. The width of the tip of the gripping portion is smaller than the width of the opening guide. The packaging material according to claim 1 or claim 2.

7. The width of the base end portion of the gripping portion is larger than the width of the opening guide. The packaging material according to claim 6.

Images