Packaging materials, rolls of raw packaging material, and packaging bags

Abstract

To provide a packaging material capable of ensuring a consistent width of a belt-like opening formed in the packaging material upon unsealing.SOLUTION: A packaging material comprises a sheet body 10, a plurality of cut tapes 40 extending in an unsealing direction, a notch 11 formed in the unsealing start region of the sheet body 10, an unsealing piece 20 formed on the unsealing direction side of the notch 11, and a protective sheet 30 arranged on the sheet body 10 to cover the notch 11. The plurality of cut tapes 40 have straight line-cuttability along the unsealing direction. The plurality of cut tapes 40 include at least a first cut tape 41 arranged on one endmost side in an unsealing crossing direction orthogonal to the unsealing direction, and a second cut tape 42 arranged on the other endmost side. The notch 11 is arranged from the first cut tape 41 to the second cut tape 42. One end of the notch 11 is arranged within the width of the first cut tape 41, and the other end of the notch 11 is arranged within the width of the second cut tape 42.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, film-shaped packaging materials that allow lumpy foods such as rice balls, sandwiches, and cooked bread to be hygienically eaten while held by hand are known. For example, Patent Document 1 discloses a packaging material in which a band-shaped opening for exposing the food inside is formed by pinching an unsealing tab, which is the starting point of unsealing, with fingers and tearing the packaging material.

[0003] This packaging material is provided with a cut tape that ensures an opening of sufficient length. That is, when the packaging material is torn starting from the unsealing tab, a band-shaped cut piece continuous with the unsealing tab is turned outward while forming cuts on both sides in the width direction, and an opening is formed between the pair of cuts. Here, even if at least one of the pair of cuts shifts inward, the presence of the cut tape prevents the cut from cutting further inward, and the cut extends along the cut tape. This suppresses disconnection of the cut piece and secures the width of the opening.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] In the conventional packaging materials described above, the width of the opening formed by tearing is ensured by the cut tape. However, there is nothing to restrict the outward expansion of the pair of cuts created by peeling back the cut pieces. As a result, the opening may become wider than the desired width. If the opening is excessively wide, inconveniences such as food falling out of the opening or difficulty in picking up food by hand through the packaging material can occur, so there is room for improvement.

[0006] Therefore, the main objective of the present invention is to provide a packaging material that can maintain a constant width for the strip-shaped opening formed in the packaging material upon opening. [Means for solving the problem]

[0007] (1) The packaging material of the present invention comprises: a sheet body capable of enclosing an object to be packaged and having an opening start area set at a predetermined location; a plurality of cut tapes provided on the sheet body and extending in the opening direction from at least the opening start area; a notch formed in the opening start area; an opening piece formed on the side of the notch in the opening direction in the opening start area due to the formation of the notch; and a protective sheet placed on the sheet body covering the notch, wherein each of the plurality of cut tapes has a linear cutting property along the opening direction, and the plurality of cut tapes include at least a first cut tape positioned at the one end side of the opening crossing direction perpendicular to the opening direction, and a second cut tape positioned at the other end side, the notch is positioned from the first cut tape to the second cut tape, one end of the notch is positioned within the width of the first cut tape, and the other end of the notch is positioned within the width of the second cut tape.

[0008] (2) In (1), it is preferable that the pair of strip-shaped sheet portions extending in the opening direction are arranged on the outside of the sheet body in the opening intersection direction of the first cut tape and the second cut tape.

[0009] (3) The packaging bag of the present invention includes a bag body in which the sheet body of the packaging material of (1) or (2) is formed into a bag shape, and the packaged object is contained inside the bag body.

[0010] (4)(3) The sheet body may be folded to form the bag into a three-dimensional shape.

[0011] (5) The packaging material roll of the present invention is a roll in which the packaging material of (2) is integrated so as to be continuous in the direction in which the strip-shaped sheet portion extends, and the packaging material roll is wound in a roll shape. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a packaging material that can maintain a constant width for the strip-shaped opening formed in the packaging material upon opening. [Brief explanation of the drawing]

[0013] [Figure 1] This is a plan view showing a packaging material according to an embodiment. [Figure 2] This is a perspective view of the packaging material according to the embodiment. [Figure 3] This is an exploded perspective view of the packaging material according to the embodiment. [Figure 4] This is a plan view enlarged showing the opening start area and its surroundings set in the packaging material according to the embodiment. [Figure 5] This is a perspective view showing food packaged with the packaging material according to the embodiment. [Figure 6] This is a perspective view showing the packaging material according to the embodiment in an opened state. [Figure 7] This is a perspective view showing an example of a packaging bag obtained by processing the packaging material according to the embodiment. [Figure 8] This is a perspective view showing a roll of raw packaging material according to an embodiment. [Figure 9] This is a schematic side view showing an example of a manufacturing line for carrying out the packaging material manufacturing method according to the embodiment. [Figure 10]It is a partially enlarged plan view of a packaging material showing a notch according to a first modification of the embodiment. [Figure 11] It is a partially enlarged plan view of a packaging material showing a notch and a cut tape according to a second modification of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments will be described with reference to the drawings.

[0015] (Packaging Material) 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 main 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 an unsealing start region 15 set in the packaging material 1 and the periphery thereof. Fig. 5 is a perspective view showing a state where food 5 is packaged with the packaging material 1, and Fig. 6 is a perspective view showing a state where the packaging material 1 is being opened.

[0016] As shown in, for example, Fig. 5, the packaging material 1 packages a rectangular parallelepiped food 5 as an article to be packaged by push-up packaging, which will be described later.

[0017] As shown in Figs. 1 to 3, the packaging material 1 according to the embodiment includes a sheet main body 10 forming the main body of the packaging material 1, a protective sheet 30, a plurality of cut tapes 40, and a belt-shaped sheet portion 50. In Figs. 1 to 4, L denotes the length direction of the packaging material 1 and the sheet main body 10, and W denotes the width direction thereof. Hereinafter, the length direction and the width direction of the sheet main body 10 refer to the directions indicated by L and W in Figs. 1 to 3, respectively. The width direction W may be referred to as the left-right direction. The left-right direction in this case is the left-right direction in Fig. 1. As shown in Fig. 1, the packaging material 1 has a bilaterally symmetric configuration with a center line P passing through the center in the width direction as a symmetry line.

[0018] As shown in Figures 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 packaged object and an outer surface 10b opposite to the inner surface 10a. The sheet body 10 also has edges 10e, including each of the four edges 10e1, 10e2, 10e3, and 10e4. Hereafter, based on Figure 1, these edges will be referred to as the upper edge 10e1, the lower edge 10e2, the left edge 10e3, and the right edge 10e4. The sheet body 10 has a shape and size that can enclose the entire surface of the packaged object.

[0019] An opening start area 15 is set at a predetermined location in the center of the sheet body 10 in the width direction and on the upper edge 10e1 side, which is one end in the length direction. The sheet body 10 is torn open along the opening direction (indicated by arrow M in Figures 1 to 6) from the opening start area 15 toward the lower edge 10e2 side. The opening direction is along the length direction of the sheet body 10.

[0020] A notch 11 is formed in the opening start area 15. The notch 11 is a cut line that penetrates from the outer surface 10b to the inner surface 10a. As shown in Figures 1 and 4, the notch 11 is formed in a flattened inverted U shape and is positioned from the first cut tape 41 to the second cut tape 42.

[0021] The notch 11 includes an intersection 11a extending in the width direction of the sheet body 10, a first guide portion 11b that is continuous with the intersection 11a and forms one end of the notch 11 on the left edge 10e3 side, and a second guide portion 11c that is continuous with the intersection 11a and forms the other end of the notch 11 on the right edge 10e4 side. The first guide portion 11b extends in the length direction of the sheet body 10, bending from one end of the intersection 11a toward the lower edge 10e2 side. The second guide portion 11c extends in the length direction of the sheet body 10, bending from the other end of the intersection 11a toward the lower edge 10e2 side. The notch 11 does not open to any of the edges 10e of the sheet body 10, i.e., the upper edge 10e1, the lower edge 10e2, the left edge 10e3, or the right edge 10e4.

[0022] The formation of the notch 11 creates an opening piece 20 on the opening direction side of the notch 11. The opening piece 20 is located within the opening start region 15. This opening piece 20 is the portion of the sheet body 10 surrounded by the notch 11, and allows a part of the sheet body 10 to be peeled back towards the outer surface 10b in the opening direction. When the opening piece 20 is peeled back towards the outer surface 10b, the sheet body 10 can be cut in the opening direction, starting from the first guide portion 11b and the second guide portion 11c of the notch 11.

[0023] In addition to continuous linear cuts, the notch 11 may also be a discontinuous linear cut with some uncut portions. For example, it may be a cut line (sometimes called a perforation) in which the cut and uncut portions are alternately continuous with lengths of 1 mm or more, or a cut line (sometimes called a microjoint) in which the cut and uncut portions are even shorter, for example 0.9 mm or less, with alternating lengths, or a cut line (sometimes called a joint) that has at least one uncut portion in the middle.

[0024] The cut tape 40 of this embodiment includes two strip-shaped cut tapes, namely a first cut tape 41 and a second cut tape 42. The widths of the first cut tape 41 and the second cut tape 42 are the same. The first cut tape 41 passes through one end of the opening start area 15 in the width direction (the left side in Figure 1), and the second cut tape 42 passes through the other end of the opening start area 15 in the width direction (the right end in Figure 1). The first cut tape 41 and the second cut tape 42 are parallel to the length direction of the sheet body 10 and extend along the entire length of the sheet body 10. Therefore, the first cut tape 41 and the second cut tape 42 are parallel to each other and spaced apart in the opening intersection direction perpendicular to the opening direction.

[0025] In this embodiment, 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 attached to the inner surface 10a of the sheet body 10 by means of ultrasonic sealing, heat sealing, or adhesive application.

[0026] The first cut tape 41 and the second cut tape 42 have a linear cut property in one direction, which is their own length direction, i.e., the opening direction of the packaging material 1. Having a linear cut property in one direction (also called having directionality) means that when tearing in that linear direction, it can be torn linearly along that direction without stress, and it is relatively difficult to tear in a direction intersecting the tearing direction. Therefore, the first cut tape 41 and the second cut tape 42 can be easily torn linearly in the opening direction.

[0027] The first cut tape 41 and the second cut tape 42 use a directional film that has the linear cutting properties and flexibility described above. Examples of such directional films include uniaxially oriented thermoplastic synthetic resin films and biaxially oriented thermoplastic synthetic resin films that have extremely high orientation in one direction compared to one direction. Specifically, examples include polyester films, polyamide films, and polypropylene films.

[0028] As shown in Figure 4, the first guide portion 11b of the notch 11 is positioned within the width of the first cut tape 41. The first guide portion 11b is positioned approximately in the middle of the width direction of the first cut tape 41 and extends in the opening direction. The second guide portion 11c of the notch 11 is positioned within the width of the second cut tape 42. The second guide portion 11c is positioned approximately in the middle of the width direction of the second cut tape 42 and extends in the opening direction.

[0029] The first cut tape 41 and the second cut tape 42 may be placed on the outer surface 10b of the sheet body 10, or they may be placed so that the sheet body 10 is sandwiched between both the inner surface 10a and the outer surface 10b.

[0030] The protective sheet 30 is a rectangular film that is elongated in the width direction of the sheet body 10. A portion of the protective sheet 30 is adhered to the outer surface 10b of the sheet body 10. The opening piece 20 is peeled back towards the outer surface 10b via the protective sheet 30. Although the shape of the protective sheet 30 in this embodiment is rectangular, the shape of the protective sheet 30 is not limited to this, and may be, for example, square, circular, elliptical, or a shape that approximates the shape of the packaged item.

[0031] The protective sheet 30 includes a protective portion 31 and a gripping portion 32. The protective portion 31 is adhered to the outer surface 10b, which includes the opening piece 20, and covers the notch 11. The protective portion 31 is joined to the entire area of ​​the opening piece 20 and the surrounding area of ​​the opening piece 20 by means of adhesive or heat sealing. The entire area of ​​the protective portion 31 is adhered to the outer surface 10b, and the notch 11 is closed by this protective portion 31. Therefore, the notch 11 is separated from the outside by the protective portion 31. The gripping portion 32 is a rectangular film piece that is continuous from the protective portion 31 toward the upper edge 10e1. This gripping portion 32 is not adhered to the outer surface 10b and can be peeled away from the outer surface 10b by pinching it with your fingers. The area of ​​adhesion of the protective portion 31 to the outer surface 10b is approximately equal to the opening start area 15. The protective sheet 30 may also be placed on the inner surface 10a side of the sheet body 10. In that case, the protective portion 31 covers the notch 11 and is adhered to the inner surface 10a.

[0032] When the lifted tab 32 of the protective sheet 30 is pulled strongly toward the protective part 31 (towards the opening direction), the portion of the protective part 31 on the tab 32 side of the notch 11 peels off from the outer surface 10b. If the protective sheet 30 is continued to be pulled, the opening piece 20 peels off following the protective sheet 30 while remaining adhered to the protective part 31. Then, as shown in Figure 6, a first cut 12a is created on the extension of the first guide portion 11b of the notch 11, and a second cut 12b is created on the extension of the second guide portion 11c of the notch 11. As a result, the sheet body 10 is partially torn along its length, and the packaging material 1 is opened. The operation of opening will be described in detail later.

[0033] As shown in Figures 1 to 3, a pair of left and right strip-shaped sheet portions 50 extending in the longitudinal direction of the sheet body 10 are arranged on the inner surface 10a of the sheet body 10. The strip-shaped sheet portions 50 are arranged on both sides in the width direction of the cut tape 40. The strip-shaped sheet portions 50 include a first strip-shaped sheet portion 51 and a second strip-shaped sheet portion 52. The first strip-shaped sheet portion 51 is arranged between the first cut tape 41 and the left edge 10e3. The second strip-shaped sheet portion 52 is arranged between the second cut tape 42 and the right edge 10e4. These strip-shaped sheet portions 51 and 52 are substantially parallel to the cut tape 40. Each strip-shaped sheet portion 51 and 52 is attached to the inner surface 10a of the sheet body 10 by means of ultrasonic sealing, heat sealing, or adhesive application.

[0034] 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 they may be arranged so that the sheet body 10 is sandwiched between both the inner surface 10a and the outer surface 10b.

[0035] The sheet body 10, the protective sheet 30, and each strip-shaped sheet portion 51, 52 are made of a flexible transparent or translucent synthetic resin film. The resin film preferably has heat-sealing properties to facilitate heat sealing. The resin film can be a single-layer or multi-layer synthetic resin film. In the case of a single layer, examples include synthetic resin films such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). In the case of a multi-layer film, for example, a synthetic resin film such as polypropylene containing a PVDC (polyvinylidene chloride) coating that acts as a moisture-blocking barrier layer can be used. Specifically, OPP (biaxially oriented polypropylene), CPP (unoriented polypropylene), etc., are preferably used.

[0036] The first cut tape 41 and the second cut tape 42 are made of directional films that are flexible and have the ability to cut linearly along their own length, as described above. The first cut tape 41 and the second cut tape 42 may be made of transparent or translucent films. The sheet body 10, the protective sheet 30, and each strip-shaped sheet portion 51, 52 may be made of resin films that do not have the ability to cut linearly. At least one of the sheet body 10, the protective sheet 30, and each strip-shaped sheet portion 51, 52 may be made of a material other than the resin film described above, such as paper or nonwoven fabric.

[0037] The thickness of the sheet body 10, the first cut tape 41 of the protective sheet 30, the second cut tape 42, and the resin film forming each strip-shaped sheet portion 51, 52 may be the same. However, it is desirable that the protective sheet 30 be relatively thick and rigid so as to prevent the tab portion 32, which is grasped by fingers when opening, from tearing. Furthermore, it is desirable that the sheet body 10 has a thickness that maintains the packaging state, and a thickness that allows it to be easily torn when opening.

[0038] As shown in Figure 5, for example, the packaging material 1 packages the food 5 by a so-called push-up packaging method, where the rectangular parallelepiped-shaped food 5 is pressed against the approximate center of the inner surface 10a, and the packaging material 1 is deformed to conform to the outer shape of the food 5, enclosing it. The packaging material 1 that has wrapped the food 5 is folded in on the back side of the food 5, which is not visible in Figure 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 bonded by heat sealing to maintain the packaged state. In the packaging material 1 that has wrapped the food 5, the length direction of the sheet body 10 is approximately parallel to the length direction of the food 5, and the notch 11 and protective sheet 30 are positioned slightly towards one end in the length direction from the center of the front side.

[0039] The process of opening the packaging material 1 will now be explained. When the tab portion 32 of the protective sheet 30 is grasped with the fingers and peeled back towards the outer surface 10b, and then pulled towards the protective portion 31 in the opening direction, the portion of the protective portion 31 closer to the tab portion 32 than the notch 11 peels away from the outer surface 10b. If the tab portion 32 is continued to be pulled in the opening direction, the opening piece 20, which is attached to and overlapping the protective portion 31, follows the protective portion 31 and is peeled back towards the outer surface 10b, starting from the intersection portion 11a of the notch 11. If the tab portion 32 is pulled further in the opening direction, as shown in Figure 6, a first cut 12a is created on the sheet body 10 on the extension of the first guide portion 11b of the notch 11, and a second cut 12b is created on the extension of the second guide portion 11c of the notch 11. As a result, the strip-shaped cut piece 21 that is continuous with the opening piece 20 is peeled back. The cut piece 21 is part of the sheet body 10.

[0040] As the cut piece 21 is peeled back in this manner, a strip-shaped opening 13 extending in the longitudinal direction is formed between the first cut 12a and the second cut 12b. The opening 13 divides the packaging material 1 into left and right halves, allowing the food 5 to be eaten from the opening 13 while being held by hand. Alternatively, the food 5 can be removed from the opening 13. The cut piece 21 may be torn off and separated from the packaging material 1, or it may be left in place.

[0041] As described above, when the packaging material 1 is opened, the first cut 12a is formed approximately in the middle of the width direction of the first cut tape 41. The second cut 12b is formed approximately in the middle of the width direction of the second cut tape 42. Here, both the first cut tape 41 and the second cut tape 42 have a linear cutting property along the opening direction. Therefore, the first cut 12a is guided by the linear cutting property of the first cut tape 41 and extends straight along the opening direction approximately in the middle of the width direction. Similarly, the second cut 12b is guided by the linear cutting property of the second cut tape 42 and extends straight along the opening direction approximately in the middle of the width direction. As a result, the change in path of both the first cut 12a and the second cut 12b to either the inside or outside is suppressed. Consequently, the width of the strip-shaped opening 13 formed in the packaging material 1 upon opening remains approximately constant. Furthermore, it is unlikely that the width of the opening 13 will widen, or that the first cut 12a and the second cut 12b will merge and the opening 13 will disappear.

[0042] The first cut tape 41 is divided into two in the width direction by the first cut 12a. The inner portion in the width direction is torn off while remaining adhered to the inner surface of the cut piece 21, and the outer portion in the width direction remains on the inner surface 10a of the sheet body 10 that is packaging the food 5. The second cut tape 42 is divided into two in the width direction by the second cut 12b. The inner portion in the width direction is torn off while remaining adhered to the inner surface of the cut piece 21, and the outer portion in the width direction remains on the inner surface 10a of the sheet body 10 that is packaging the food 5.

[0043] (packaging bag) The packaging form using the packaging material 1 according to this embodiment is not limited to the push-up packaging shown in Figure 5. For example, as shown in Figure 7, by bonding the widthwise ends of the sheet body 10 together to form a back-bonded portion 14a, and bonding the opposing ends on the other lengthwise end (bottom end in Figure 6) together to form a bottom seal portion 14b, a packaging bag 14 folded into a so-called gusseted packaging form with an opening 14c can be obtained. This packaging bag 14 includes a rectangular bag body 14d. This packaging bag 14 has the form of a so-called pillow packaging bag. The packaging bag 14 can contain and package, for example, bulk foods such as rice balls, sandwiches, prepared bread, and hamburgers, as well as liquid, powder, granular, or other materials to be packaged. After the materials to be packaged are contained, the opening 14c is airtightly sealed to create a tight seal.

[0044] Furthermore, the packaging bag 14 may be formed by further folding the sheet body 10 as appropriate to create a three-dimensional bag body 14d. In this case, the three-dimensional shape may include not only a cubic shape or a rectangular parallelepiped shape, but also a triangular prism shape or a cylindrical shape.

[0045] In this way, when forming a packaging bag 14 from packaging material 1, a large number of these packaging bags 14 can be manufactured, and at the point of supply, any items to be packaged can be placed in the packaging bags 14 and sealed.

[0046] (Packaging material raw material roll) The packaging material 1 according to this embodiment can be obtained in large quantities continuously from the packaging material raw material roll 1R shown in Figure 8.

[0047] The packaging material roll 1R according to this embodiment is a roll in which a long packaging material roll 1G, in which numerous packaging materials 1 are integrated so as to be continuous along the length direction, is wound. By cutting the cutting boundary 1c provided on the packaging material roll 1R, numerous packaging materials 1 can be obtained sequentially.

[0048] The packaging material roll 1G mainly consists of a long, strip-shaped sheet body roll 10G made of resin film. The sheet body roll 10G is provided with cutting boundaries 1c that divide numerous sheet body portions 10A, which will become individual sheet bodies 10. Each sheet body portion 10A is provided with a notch 11 and an opening tab 20, and a protective sheet 30 that covers the notch 11 is adhered to the side that is set as the outer surface 10b. The protective portion 31 of the protective sheet 30 is peelably adhered to the sheet body roll 10G with adhesive.

[0049] In the packaging material roll 1R, the protective sheet 30 has a tab portion 32 that is not adhered to the sheet material roll 10G positioned on the roll winding side, and a protective portion 31 that is adhered to the sheet material roll 10G positioned on the roll unwinding side.

[0050] Furthermore, the raw materials for the first cut tape 41 and the second cut tape 42, and the first strip-shaped sheet portion 51 and the second strip-shaped sheet portion 52, namely the first cut tape raw material 41G and the second cut tape raw material 42G, and the first strip-shaped sheet portion raw material 51G and the second strip-shaped sheet portion raw material 52G, are each attached to the side that is set to the inner surface 10a. The first cut tape raw material 41G and the second cut tape raw material 42G each have the ability to cut in a straight line along their own length. The packaging material raw material roll 1R is wound into a roll shape such that the outer surface 10b to which the protective sheet 30 is attached is positioned on the outer circumferential side. Therefore, each cut tape raw material 41G, 42G and each strip-shaped sheet portion raw material 51G, 52G are positioned on the inner circumferential side.

[0051] By unwinding the packaging material roll 1G from the packaging material roll 1R and sequentially cutting along the cutting boundary 1c, one sheet of packaging material 1 can be obtained at a time. Furthermore, when unwinding the packaging material roll 1G from the packaging material roll 1R, the protective sheet 30 is unwound first from the protective portion 31 which is adhered to the sheet body roll 10G, and the unadhesive tab portion 32 comes out later. As a result, there is no risk of the tab portion 32 of the protective sheet 30 curling up, folding, or overlapping, and the unwinding is performed smoothly. In addition, if the protective sheet 30 is relatively thick and the tab portion 32 has stiffness, the tab portion 32 will not bend when winding the packaging material roll 1R, and it can be wound smoothly.

[0052] (Manufacturing method for packaging material rolls) The packaging material raw material roll 1R according to this embodiment is manufactured, for example, by the production line 60 shown in Figure 9.

[0053] In the manufacturing line 60 shown in Figure 9, the sheet body raw material 10G is unwound in the H direction from the sheet body raw material roll 10R and conveyed. Immediately after unwounding from the sheet body raw material roll 10R, the first cut tape raw material 41G and the second cut tape raw material 42G unwound from the cut tape raw material roll 40R, and the first strip sheet part raw material 51G and the second strip sheet part raw material 52G unwound from the strip sheet part raw material roll 50R are overlapped at predetermined locations on the outer surface side of the sheet body raw material 10G. Next, at the sealing section 61, each cut tape raw material 41G, 42G and each strip sheet part raw material 51G, 52G are attached to the sheet body raw material 10G. The sealing section 61 has an attachment means such as ultrasonic sealing or heat sealing, but ultrasonic sealing is preferred because it is less likely to cause wrinkles in the attached part and its surroundings.

[0054] Next, notches 11 are formed in the sheet body roll 10G at the notch forming section 62. The notches 11 are formed by punching out the sheet body roll 10G, the first cut tape roll 41G, and the second cut tape roll 42G with a cutter (not shown) having the shape of a notch 11. The notches 11 are formed intermittently in the opening start area 15 of each individual packaging material 1 that is partitioned in the sheet body roll 10G by the aforementioned cutting boundary 1c.

[0055] Next, at the protective sheet attachment section 63, the protective sheet 30 is adhered to the side of the sheet body roll 10G opposite to the side to which the cut tape rolls 41G, 42G and the strip-shaped sheet rolls 51G, 52G are attached. The protective sheets 30 are peeled off one by one from the protective sheet roll 30R, which has the protective sheets 30 attached to the backing paper at regular intervals, and intermittently adhered to the opening start area 15 of each sheet body section 10A.

[0056] As described above, the sheet body roll 10G is fitted with the cut tape rolls 41G and 42G and the strip-shaped sheet rolls 51G and 52G, and a notch 11 is formed in the opening start area 15, and a protective sheet 30 is adhered to the opening start area 15, as shown in Figure 8, to produce the packaging material roll 1G. Then, this packaging material roll 1G is wound up to obtain a packaging material roll 1R. The packaging material roll 1G is unwound from this packaging material roll 1R, and the sheet body portion 10A is cut at the cutting boundary 1c to obtain one packaging material 1 at a time.

[0057] As described above, the sheet body roll 10G is fitted with the cut tape rolls 41G and 42G and the strip-shaped sheet rolls 51G and 52G, and a notch 11 is formed in the opening start area 15, and a protective sheet 30 is adhered to the opening start area 15, as shown in Figure 8, to produce the packaging material roll 1G. Then, this packaging material roll 1G is wound up to obtain a packaging material roll 1R. The packaging material roll 1G is unwound from this packaging material roll 1R, and the sheet body portion 10A is cut at the cutting boundary 1c to obtain one packaging material 1 at a time.

[0058] In the embodiment, the packaging material roll 1G has a first strip-shaped sheet roll 51G and a second strip-shaped sheet roll 52G attached to the respective positions near both ends in the width direction, extending in the length direction. This suppresses the thickness unevenness caused by the first cut tape roll 41G and the second cut tape roll 42G and the protective sheet 30, which would otherwise increase the thickness in the center of the width direction, and allows the thickness in the width direction to be made uniform overall. As a result, when winding the packaging material roll 1G to obtain a packaging material roll 1R, the occurrence of twisting due to thickness unevenness and resulting winding defects is suppressed.

[0059] According to the embodiments described above, the following effects are achieved.

[0060] The packaging material 1 according to this embodiment comprises a sheet body 10 capable of enclosing a food item 5 to be packaged, with an opening start area 15 set at a predetermined location, a plurality of cut tapes 40 provided on the sheet body 10 and extending at least from the opening start area 15 in the opening direction, a notch 11 formed in the opening start area 15, an opening piece 20 formed on the opening direction side of the notch 11 in the opening start area 15 due to the formation of the notch 11, and a protective sheet 30 placed on the sheet body 10 covering the notch 11, and each of the plurality of cut tapes 40 is The cut tapes 40 have a linear cut capability along the opening direction, and each of the cut tapes 40 includes at least a first cut tape 41 positioned at the one end in the opening crossing direction perpendicular to the opening direction, and a second cut tape 42 positioned at the other end, the notch 11 is positioned from the first cut tape 41 to the second cut tape 42, the first guide portion 11b forming one end of the notch 11 is positioned within the width of the first cut tape 41, and the second guide portion 11c forming the other end of the notch 11 is positioned within the width of the second cut tape 42.

[0061] According to the packaging material 1 of this embodiment, the sheet body 10 is torn open by pinching the opening piece 20 that has been peeled back to the outer surface 10b side of the sheet body 10 and pulling it in the opening direction, thereby forming a strip-shaped opening 13. The opening 13 is formed in a strip shape between a first cut 12a formed extending in the opening direction from the first guide portion 11b of the notch 11 and a second cut 12b formed extending in the opening direction from the second guide portion 11c of the notch 11. Since both the first cut tape 41 on which the first guide portion 11b is located and the second cut tape 42 on which the second guide portion 11c is located have linear cutting properties along the opening direction, the first cut 12a and the second cut 12b, respectively, advance straight in the opening direction, guided by the linear cutting properties of the first cut tape 41 and the second cut tape 42. As a result, the strip-shaped opening 13 formed in the packaging material 1 can be formed with a constant width without its width widening or disappearing.

[0062] Since a first guide portion 11b and a second guide portion 11c extending in the opening direction are formed at both ends of the notch 11, the first cut 12a and the second cut 12b are smoothly formed in the opening direction by being guided by these guide portions 11b and 11c.

[0063] Directional films that allow for straight cuts are more expensive than non-directional films. Therefore, by using non-directional films for the films other than the cut tape 40 (sheet body 10, protective sheet 30, strip-shaped sheet portion 50) and using directional films only for the cut tape 40, material costs can be reduced and manufacturing costs can be lowered. Furthermore, the cut tape 40 has two cut tapes, namely a first cut tape 41 and a second cut tape 42. The first cut 12a and the second cut 12b formed along these cut tapes 41 and 42 when opened are formed straight without protruding from each cut tape 41 and 42, even if each cut tape 41 and 42 is narrow. For this reason, by making the width of each cut tape 41 and 42 narrower, material costs can be reduced and manufacturing costs can be lowered.

[0064] In the packaging material 1 according to this embodiment, it is preferable that a pair of strip-shaped sheet portions 51A and 51B extending in the opening direction are arranged on the outside of the sheet body 10 in the direction of intersection of the opening of the first cut tape 41 and the second cut tape 42.

[0065] This prevents unevenness in the overall thickness of the packaging material 1 in the width direction. Therefore, when the raw material of the packaging material 1 (the above-mentioned raw material 1G) is wound into a roll, winding defects due to uneven thickness can be suppressed.

[0066] The packaging bag 14 according to this embodiment includes a bag body 14d formed from a sheet body 10 of the packaging material 1, and the packaged item is contained inside the bag body 14d.

[0067] This allows the packaging material 1 to be used to package the object being packaged 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 objects in various forms, such as liquids, powders, and granules.

[0068] The packaging bag 14 according to this embodiment includes a form in which the sheet body 10 is folded to form a bag body 14d in a cubic shape.

[0069] This allows the bag body 14d to take on various shapes depending on how the sheet body 10 is folded.

[0070] In the embodiment, the packaging material roll 1R is wound in a roll shape, in which the packaging material 1 is integrated so as to be continuous in the direction in which the first strip-shaped sheet portion 51 and the second strip-shaped sheet portion 52 extend.

[0071] As a result, multiple packaging materials 1 can be easily manufactured by cutting them out from a single roll of packaging material 1G. Furthermore, since the first strip-shaped sheet portion 51 and the second strip-shaped sheet portion 52 extend outwards in the opening direction of the first cut tape 41 and the second cut tape 42, when manufacturing the aforementioned packaging material roll 1G, winding the packaging material roll 1G into a roll shape to form a packaging material roll 1R can be made to suppress winding defects due to uneven thickness.

[0072] Next, a first and second modified example, which are variations of the above embodiment, will be described with reference to Figures 10 and 11. In Figures 10 and 11, the same reference numerals are used for components identical to those in the above embodiment, and their descriptions are omitted.

[0073] (First variation) Figure 10 is a partially enlarged plan view of a packaging material equipped with a notch 71 according to the first modified example. In the first modified example, the notch 71 includes a plurality (in this case, five) of notch portions 71a of the same shape and dimensions. The notch portion 71a is a cut line that penetrates from the outer surface 10b to the inner surface 10a of the sheet body 10. The notch portion 71a has a symmetrical arc shape that is gently convex on the upstream side (upper side in Figure 10) in the opening direction. When a notch is formed by a combination of multiple notch portions, these notch portions are not limited to having the same shape and dimensions, and the notch may be formed by combinations of different shapes and different dimensions.

[0074] As shown in Figure 10, the five notches 71a, when viewed from above, are arranged in a staggered pattern from one end to the other in the width direction of the sheet body 10, alternatingly offset from one end to the other in the length direction of the sheet body 10, and are also arranged symmetrically from left to right. In this case, three notches 71a are located on the upstream side in the opening direction, and two notches 71a are located on the downstream side (lower side in Figure 10) in the opening direction. A pair of notches 71a that are adjacent in the width direction while offset from each other in the opening direction (length direction of the sheet body 10) have overlapping portions when viewed in the opening direction. Each of the mountain-shaped portions on the downstream side in the opening direction of each notch 71a is an opening piece 75.

[0075] In Figure 10, the leftmost notch portion 71b, closest to the left edge 10e3, has a left end 72a which is located within the width of the first cut tape 41. The rightmost notch portion 71c, closest to the right edge 10e4, has a right end 72b which is located within the width of the second cut tape 42.

[0076] According to the first modified example, when the gripping portion 32 is grasped and the protective sheet 30 is pulled in the opening direction, each opening piece 75 corresponding to the three notches 71a on the upstream side in the opening direction is peeled back toward the outer surface 10b, and cuts are created in the opening direction from both ends of these three notches 71a. From the left end 72a of the left end notch 71b, a first cut 12a is created that extends along the first cut tape 41, and from the right end 72b of the right end notch 71c, a second cut 12b is created that extends along the second cut tape 42. Cuts 12g other than the first cuts 12a and second cuts 12b at both ends in the width direction reach one of the notches 71a on the downstream side in the opening direction. As a result, the five notches 71a are continuous through these cuts 12g. From this state, if the protective sheet 30 is pulled further in the opening direction, each opening piece 75 will peel off as a single combined opening piece, and the sheet body 10 will be torn apart. As a result, a strip-shaped opening is formed between the first cut 12a that extends along the opening direction within the first cut tape 41 and the second cut 12b that extends along the opening direction within the second cut tape 42, and the packaging material 1 is opened.

[0077] In the first modified example, the first cut 12a extends straight in the opening direction, guided by the linear cutting properties of the first cut tape 41, and the second cut 12b extends straight in the opening direction, guided by the linear cutting properties of the second cut tape 42. As a result, the width of the opening formed between the first cut 12a and the second cut 12b remains approximately constant.

[0078] (Second variation) Figure 11 is a partially enlarged plan view of a packaging material equipped with a notch 11 and a cut tape 40 according to a second modified example. The cut tape 40 of the second modified example includes a third cut tape 43 in addition to the first cut tape 41 and the second cut tape 42 of the above embodiment. The third cut tape 43 is positioned between the first cut tape 41 and the second cut tape 42.

[0079] In the opening intersection direction, which is perpendicular to the opening direction, the first cut tape 41 is located at the one end (left side in Figure 11), and the second cut tape 42 is located at the other end (right side in Figure 11). The third cut tape 43 extends along the opening direction and is parallel to the first cut tape 41 and the second cut tape 42. The width of the third cut tape 43 is greater than the widths of the first cut tape 41 and the second cut tape 42.

[0080] The third cut tape 43 is positioned between the center line P of the sheet body 10 and the second cut tape 42. Therefore, the distance in the width direction between the first cut tape 41 and the third cut tape 43 is greater than the distance in the width direction between the second cut tape 42 and the third cut tape 43.

[0081] The third cut tape 43 is attached to the inner surface 10a of the sheet body 10 by means of ultrasonic sealing, heat sealing, or adhesive application. The third cut tape 43 may also be placed on the outer surface 10b of the sheet body 10, or the sheet body 10 may be sandwiched between both the inner surface 10a and the outer surface 10b.

[0082] The notch 11 of the second modified example has a configuration in which a third guide portion 11d is added to the notch 11 of the above embodiment. The third guide portion 11d is a cut line continuous with the intersection 11a and extends from the intersection 11a along the opening direction. This third guide portion 11d is located within the width of the third cut tape 43. The third guide portion 11d is located approximately in the middle of the width direction of the third cut tape 43. The opening piece 20 of the second modified example is separated by the third guide portion 11d into a first opening piece 20a on the first cut tape 41 side and a second opening piece 20b on the second cut tape 42 side.

[0083] The protective sheet 30 of the second modified example has perforations 35 that extend in the opening direction, continuous with the third guide portion 11d. The perforations 35 include a protective portion side perforation 35a formed on the protective portion 31 side and a gripping portion side perforation 35b formed on the gripping portion 32 side. The gripping portion 32 of the protective sheet 30 of the second modified example includes a first gripping portion 32a on the first cut tape 41 side and a second gripping portion 32b on the second cut tape 42 side, separated by the gripping portion side perforation 35b. By tearing the gripping portion side perforation 35b, the gripping portion 32 can be separated into the first gripping portion 32a and the second gripping portion 32b.

[0084] According to the second modification, by pinching the separated first gripping portion 32a and pulling it in the opening direction, the first opening piece 20a peels back, and the first cut 12a originating from the first guide portion 11b of the notch 11 advances along the opening direction within the first cut tape 41. At the same time, a third cut 12c is created in the opening direction from the third guide portion 11d of the notch 11, and this third cut 12c advances along the opening direction within the third cut tape 43. When the third cut 12c passes through the protective portion 31, the perforations 35a on the protective portion side also follow and are torn in the opening direction. That is, the sheet body 10 and the protective portion 31 are torn simultaneously. As a result, a strip-shaped opening (referred to as the first opening) is formed between the first cut 12a and the third cut 12c, and the packaging material 1 is opened. The first cut 12a extends straight in the opening direction, guided by the straight-cut properties of the first cut tape 41, and the third cut 12c extends straight in the opening direction, guided by the straight-cut properties of the third cut tape 43. As a result, the width of the first opening remains approximately constant.

[0085] On the other hand, when the separated second tab 32b is grasped and pulled in the opening direction, the second opening piece 20b peels back, and the second cut 12b originating from the second guide portion 11c of the notch 11 advances along the opening direction within the second cut tape 42. At the same time, a third cut 12c is created in the opening direction from the third guide portion 11d of the notch 11, and this third cut 12c advances along the opening direction within the third cut tape 43. When the third cut 12c passes through the protective portion 31, the perforations 35a on the protective portion side also follow and are torn in the opening direction. In other words, the sheet body 10 and the protective portion 31 are torn simultaneously. As a result, a strip-shaped opening (referred to as the second opening) is formed between the second cut 12b and the third cut 12c, and the packaging material 1 is opened. The second cut 12b extends straight in the opening direction, guided by the straight-cut properties of the second cut tape 42, and the third cut 12c extends straight in the opening direction, guided by the straight-cut properties of the third cut tape 43. As a result, the width of the second opening remains almost constant.

[0086] Since the distance between the first cut tape 41 and the third cut tape 43 is greater than the distance between the second cut tape 42 and the third cut tape 43, the width of the first opening is greater than the width of the second opening. In the second modified example, the width of the opening when opened can be made different by selecting either the first gripping portion 32a or the second gripping portion 32b. That is, two opening patterns with different opening widths can be selected.

[0087] In the second modified example, the gripping portion 32 is not separated into the first gripping portion 32a and the second gripping portion 32b. By pulling it in the opening direction while it remains as is, the entire opening piece 20 can be peeled back and opened. In this case, similar to the embodiment described above, the first cut 12a and the second cut 12b are formed along the first cut tape 41 and the second cut tape 42 on both sides, respectively, and a wide opening is formed between these cuts 12a and 12b, opening the packaging material 1. Including this opening pattern, the second modified example allows for the selection of three opening patterns with different opening widths.

[0088] Although the packaging material 1 according to the embodiment and various modifications based on the embodiment have been described above, the present invention is not limited to these embodiments and modifications, and can be modified as appropriate.

[0089] For example, the shape of the notch 11 is arbitrary. For instance, unlike the first guide portion 11b and the second guide portion 11c in the above embodiment, it may not have portions extending toward the opening direction at both ends, but rather be a simple straight cut extending in the direction intersecting the opening, with both ends positioned within the width of the first cut tape 41 and the second cut tape 42, respectively. Alternatively, the sheet body 10 may be made of a directional film having a straight cut property along the opening direction. [Explanation of Symbols]

[0090] 1 Packaging material 1G Original packaging material 1R Packaging material raw material roll 5 Food (packaged items) 10 Sheets 10a Inner surface of the sheet body 10b Outer surface of the sheet 10e Edge of the sheet body 11, 71 Notches 14 Packaging bag 14d bag body 15 Opening start area 20, 75 opening piece 30 protective sheets 40 Cut Tapes 41 First Cut Tape 42. Second cut tape 50 Strip-shaped sheet section M Opening direction

Claims

1. A sheet body capable of enclosing the packaged item, with an opening start area set at a predetermined location, The sheet body is provided with a plurality of cut tapes that extend in the opening direction from at least the opening start area, The notch formed in the opening start region, As a result of the formation of the notch, an opening piece is formed on the side of the notch in the opening direction in the opening starting region, A packaging material comprising a protective sheet that covers the notch and is placed on the sheet body, Each of the aforementioned plurality of cut tapes has a linear cut property along the opening direction, The plurality of cut tapes include at least a first cut tape positioned at the one end of the opening crossing direction perpendicular to the opening direction, and a second cut tape positioned at the other end. The notch is positioned from the first cut tape to the second cut tape, One end of the notch is positioned within the width of the first cut tape. The other end of the notch is positioned within the width of the second cut tape in the packaging material.

2. The packaging material according to claim 1, wherein a pair of strip-shaped sheet portions extending in the opening direction are arranged on the outside of the sheet body in the opening intersection direction of the first cut tape and the second cut tape.

3. A packaging bag comprising a bag-shaped body formed from the sheet body of the packaging material according to claim 1 or 2, wherein the packaged object is contained inside the bag-shaped body.

4. The packaging bag according to claim 3, wherein the sheet body is folded to form the bag body into a three-dimensional shape.

5. A roll of packaging material in which a roll of packaging material is wound in a roll shape, wherein the packaging material described in claim 2 is integrated so as to be continuous in the direction in which the strip-shaped sheet portion extends.

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