Film package

Abstract

To suppress breakage of an unsealing broken line with a cut as a trigger in a conveyance process of a film of a film package while improving easiness of unsealing.SOLUTION: In the present invention, the top surface 12 has an unsealing broken line 12o including a cut portion a and a non-cut portion b capable of forming an elongated annular outlet 12d, the unsealing broken line includes a first cut pattern P1 formed at one of both end portions in a longitudinal direction, a second cut pattern P2 formed at the other of both end portions in the longitudinal direction, and a third cut pattern P3 including a perforation, and no non-cut portion is provided at both side ends of the elongated annular shape in the first cut pattern and the second cut pattern. In the first cut pattern, a cut portion is continuously provided in a range of 4 to 8mm starting from one of both side ends in the longitudinal direction of the elongated annular shape, and in the second cut pattern, a cut portion is continuously provided in a range of 3mm or less starting from the other of both side ends in the longitudinal direction of the elongated annular shape.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a film packaging. [Background technology]

[0002] Conventionally, there has been known a film package in which sanitary thin paper such as tissue paper, hand towels, kitchen towels, etc. is folded and stored so that it can be removed in a pop-up manner. In this film package, for example, a tear-opening broken line such as a perforation is provided on the top surface so that an elongated annular removal opening can be formed, and after the tear-opening broken line is broken, the sanitary thin paper can be removed through the removal opening (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-41599 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the film of a film packaging body is broken along the tearing line to form an access opening, if one end of the area surrounded by the tearing line is pinched and pulled toward the other end, the uncut portion of the tearing line may not be cut, and the film of the film packaging body may tear starting from that uncut portion.

[0005] Therefore, in order to improve the ease of gripping the edge in the area surrounded by the tear line and the ease of breaking the tear line, it is possible to consider making a slit at both ends of the tear line.However, if the position and size of the slit are made without sufficient consideration, there is a possibility that the slit will cause the tear line to suddenly break during the film transport process of the film packaging, allowing foreign matter to be mixed inside.

[0006] Patent Document 1 does not fully consider these points, and there is room for improvement in the shape, size, and position of the cut and uncut portions of the tear line in order to improve ease of gripping and tearing.

[0007] The present invention aims to provide a film packaging body that can improve the ease of gripping and tearing (ease of opening) in the area surrounded by the tearing line, while preventing the tearing line from accidentally tearing due to a cut during the film conveying process of the film packaging body. [Means for solving the problem]

[0008] The film packaging according to a first aspect of the present invention is a film packaging in which sanitary tissue paper is folded and stored so as to be removable in a pop-up manner, and has a tear-opening broken line on the top surface that can form an elongated annular removal opening, the tear-opening broken line being composed of cut portions and uncut portions, and the elongated annular tear-opening broken line has a first cut pattern formed at one of both longitudinal end portions of the elongated annular, a second cut pattern formed at the other longitudinal end portion of the elongated annular, and a perforation connecting the first cut pattern and the second cut pattern. and a third slit pattern consisting of holes, wherein in the first slit pattern and the second slit pattern, the uncut portions are not provided at both side ends of the elongated ring, and in the first slit pattern, the slit portions are provided continuously within a range of 4 to 8 mm from one of the both side ends in the longitudinal direction of the elongated ring, and in the second slit pattern, the slit portions are provided continuously within a range of 3 mm or less from the other of the both side ends in the longitudinal direction of the elongated ring.

[0009] The film packaging body of the second form of the present invention is described as the first form, characterized in that the second cut pattern has the cut portions continuously arranged in the longitudinal direction of the elongated ring shape within a range of 1 mm or less starting from the other of the two side ends.

[0010] The film packaging body of the third aspect of the present invention is described as the first aspect, characterized in that an indicator indicating an opening is printed in the area defined by the first cut pattern.

[0011] A film packaging according to a fourth embodiment of the present invention is the film packaging according to the first embodiment, characterized in that the width of the elongated annular tear-opening broken line in the short direction is 3 to 7 mm.

[0012] The film packaging body of the fifth aspect of the present invention is the one described as the first aspect, characterized in that the tear strength of the film constituting the film packaging body in the short direction of the elongated ring is greater than the tear strength of the elongated ring in the long direction of the elongated ring.

[0013] The film packaging body according to the sixth aspect of the present invention is the one described as the first aspect, characterized in that the shape of both longitudinal ends of the elongated annular tearing line is arc-shaped, and the radius of the arc circle is 4 mm or less.

[0014] The film packaging body of the seventh aspect of the present invention is described as the first aspect, characterized in that the length of the elongated ring in the longitudinal direction is 80 to 90% of the width of the stored sanitary tissue paper sheet.

[0015] The film packaging body according to the eighth aspect of the present invention is described as the first aspect, characterized in that the three cut patterns of the opening broken line are symmetrical with respect to a center line along the longitudinal direction of the elongated ring shape.

[0016] The film packaging body of the ninth aspect of the present invention is described as the first aspect, characterized in that the second cut pattern has the uncut portion, and the length of the uncut portion closest to the other of the two longitudinal end portions of the elongated ring shape is 1 mm or less.

[0017] The film packaging body of the tenth aspect of the present invention is described as the first aspect, characterized in that the length of the slit formed on one or the other of both longitudinal ends of the elongated ring shape in the short direction of the elongated ring shape is 2.5 mm or more.

[0018] The film packaging according to an eleventh aspect of the present invention is the one described as the first aspect, characterized in that the proportion of the tear line occupied by the cut portion is 55% or less.

[0019] The film packaging body of the 12th form of the present invention is described as the first form, characterized in that the second cut pattern has an approximately linear cut portion extending in the short direction of the elongated ring at the other of both side ends of the elongated ring.

[0020] The film packaging of the 13th form of the present invention is described as the 12th form, characterized in that the length of the approximately linear cut portion is ±20% of the width in the short direction of the elongated annular perforation of the third cut pattern that is adjacent to the approximately linear cut portion.

[0021] The film packaging body of the 14th form of the present invention is described as the 12th form, characterized in that the cut portion of the perforation of the third cut pattern adjacent to the approximately linear cut portion is inclined toward the other of both side ends of the elongated ring and toward the center line along the longitudinal direction of the elongated ring.

[0022] The manufacturing method of the film packaging body according to the first to fourteenth forms of the present invention is characterized by including a step of transporting the film packaging body so that the second cutting pattern is located downstream and the first cutting pattern is located upstream. [Effects of the Invention]

[0023] According to the present invention, it is possible to improve the ease of gripping and tearing in the area surrounded by the tearing line, while preventing the tearing line from accidentally tearing due to a cut during the film conveying process of the film packaging body. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is an overall perspective view of a film packaging body according to a first embodiment of the present invention. [Figure 2] 2A and 2B are plan views of the film packaging shown in FIG. 1, where (a) is a plan view of the top surface side, and (b) is a schematic cross-sectional view in the IIb-IIb direction of (a). [Figure 3] 1A to 1C are plan views showing the tear-off line when viewing the top surface of the film packaging body according to the first to third embodiments of the present invention, where (a) represents the first embodiment, (b) represents the second embodiment, and (c) represents the third embodiment. [Figure 4] 1 is a block diagram schematically illustrating a part of a manufacturing process for a film packaging according to a first embodiment of the present invention. [Figure 5] 10A and 10B are plan views showing the tear-opening broken lines when viewing the top surface of the film packaging body according to the fourth and fifth embodiments of the present invention, where (a) represents the fourth embodiment and (b) represents the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to Figures 1 to 5. However, the present invention is not limited to this embodiment.

[0026] The film packaging according to the present invention folds and stores sanitary thin paper such as tissue paper, hand towels, and kitchen towels so that they can be removed in a pop-up manner. In the following first to fifth embodiments, the sanitary thin paper is described as tissue paper as an example. The film packaging according to the first to fifth embodiments is a stack of two tissue paper sheets folded alternately and stacked, and then wrapped in a film in a caramel-wrapped state. The packaging of the film packaging according to the present invention includes caramel-wrapped packaging as well as pillow packaging and similar packaging. A plurality of these individually wrapped film packagings are then collectively wrapped to form a collective package (see the item designated by reference numeral 6 in FIG. 4 described below).

[0027] In this specification and claims, the terms "top surface" and "bottom surface" refer to the surfaces of the film packaging bag itself. However, these terms are used merely for convenience and do not, of course, define absolute positions in the direction of gravity. The same applies to terms such as "top" and "bottom."

[0028] Furthermore, in this specification, claims, and drawings, the longitudinal direction of the film packaging body is referred to as the "width direction," and the "width direction," "height direction," and "depth direction" are all orthogonal to each other.

[0029] Furthermore, in the description of this specification, "rectangle" not only includes rectangular and square shapes, but also includes approximate rectangular shapes and approximate square shapes, and "rectangular prism" not only includes rectangular and cube shapes, but also includes approximate rectangular prisms and approximate cubes.

[0030] In this specification and the claims, the term "elongated annular shape" refers to an elongated annular shape as a whole, and includes a substantially rounded rectangle, a substantially rectangular shape, a wave shape, etc. In the following first to third embodiments, the "elongated annular shape" will be described as a pair of arcs whose ends are connected by a pair of straight lines that are longer than the arcs, and in the fourth and fifth embodiments, the "elongated annular shape" will be described as a configuration having an arc at one end and a substantially straight line at the other end, both of which are connected by a pair of straight lines.

[0031] First Embodiment Fig. 1 is an overall perspective view of a film packaging body 1 according to a first embodiment of the present invention, Fig. 2 is a plan view of the film packaging body 1 shown in Fig. 1, Fig. 2(a) is a plan view of the top surface 12 side, and Fig. 2(b) is a schematic cross-sectional view in the IIb-IIb direction of Fig. 2(a). Also, Fig. 3(a) is a plan view showing the broken line for opening when the top surface of the film packaging body according to this embodiment is viewed from above.

[0032] In the present invention, as shown in FIGS. 1 and 2(a), a film packaging 1 contains folded tissue paper 2 so that it can be taken out in a pop-up manner, and has an elongated annular take-out opening 12o on the top surface 12.

[0033] The state of being "folded so as to be removable in a pop-up manner" means that each rectangular sheet of tissue paper 2 is folded in two, and a sheet piece of the sheet stacked below and a sheet piece of the sheet stacked above are inserted between the two folded sheet pieces, resulting in a state in which many sheets are stacked. As a result, when one sheet (or one set) of tissue paper 2 is taken out from the take-out opening 12o of the film packaging 1, some of the sheet pieces of the sheets stacked below protrude from the opening and are taken out one by one in a pop-up manner.

[0034] As shown in Fig. 1, the film packaging body 1 is a rectangular parallelepiped with six faces, namely, a pair of top and bottom faces 12, a pair of long sides 13, and a pair of short sides 14, when a stack of paper tissues 2 is stored in the film packaging bag 1p, and the film packaging bag 1p has an elongated ring-shaped opening broken line 12d on the top face 12, through which the tissue paper take-out opening 12o will be formed, as shown in Fig. 1. That is, in this embodiment, the elongated ring-shaped opening broken line 12d that can form the tissue paper take-out opening 12o passes through the center of the top face 12 and extends in the width direction.

[0035] As shown in Figures 1 to 3(a), the film packaging 1 according to this embodiment is a film packaging 1 in which sanitary thin paper 2 is folded and stored so as to be removable in a pop-up manner, and has an opening broken line 12d on the top surface 12 that can form an elongated annular removal opening 12o, the opening broken line 12d being composed of a cut portion a and an uncut portion b, and the elongated annular opening broken line 12d has a first cut pattern P1 formed at one of both ends in the longitudinal direction of the elongated annular shape, a second cut pattern P2 formed at the other end in the longitudinal direction of the elongated annular shape, and a gap between the first cut pattern P1 and the second cut pattern The first slit pattern P1 and the second slit pattern P2 are composed of a third slit pattern P3 consisting of perforations a3, b3 connecting the first slit pattern P1 and the second slit pattern P2, and in the first slit pattern P1 and the second slit pattern P2, there are no uncut portions b at either end of the elongated ring, and in the first slit pattern P1, slit portions a1 are continuously formed in a range (D1) of 4 to 8 mm from one of the either end in the longitudinal direction of the elongated ring, and in the second slit pattern P2, slit portions a2 are continuously formed in a range (D2) of 3 mm or less from the other of the either end in the longitudinal direction of the elongated ring.

[0036] This configuration improves the ease of gripping and tearing in the area surrounded by the opening broken line 12d, and by transporting the film so that the second cut pattern P2, which has a smaller cut, is at the front, it is possible to prevent the opening broken line 12d from accidentally breaking due to a cut during the film transport process of the film packaging 1.

[0037] That is, in this embodiment, one side of the elongated ring-shaped opening broken line 12d is a tab portion, and the other side is minimal and has a shape that will not tear when opening.

[0038] Regarding the range of D1, if it is less than 4 mm, it is too small and difficult to grip, and if it exceeds 8 mm, foreign matter and dirt are likely to enter. Regarding the range of D2, if it exceeds 3 mm, the second slit pattern P2 is in the direction of the manufacturing process, making it easy for foreign matter and dirt to enter during the process and easy for it to get caught and tear during the manufacturing process. Regarding the range of D2, in order to exert the effects of the present invention, it is more preferable that it is 1 mm or less.

[0039] In the elongated annular tearing broken line, for example, if an uncut portion is located at the very tip of the end, the tearing will proceed from the two straight portions of the third slit pattern P3, and finally, force will be applied to the uncut portion at the very tip from both sides, which may cause the force in the tearing direction to be greater than the tearing of the uncut portion, leading to tearing. In this embodiment, since no slit portion is located at the very tip of the end, the possibility of tearing can be reduced.

[0040] Hereinafter, in the first to third slit patterns P1 to P3, the slits a1, a2, and a3 will be collectively referred to as slits a, and the unslits b1, b2, and b3 will be collectively referred to as unslits b. The same applies to the slits and unslits according to the second to fifth embodiments.

[0041] Here, the end on one side (the left side in Figures 2(a) and 3(a)) of the elongated annular broken line for opening, where a trigger is formed to enable the package to be opened by gripping it, is also referred to as the "grip portion," and the end on the other side (the right side in Figures 2(a) and 3(a)) of the elongated annular broken line for opening, where a small slit a2 is formed to prevent the film from tearing when opening from the grip portion, is also referred to as the "anti-grip portion." In other words, it can be said that the "grip portion" is defined by the first slit pattern P1, and the "anti-grip portion" is defined by the second slit pattern P2.

[0042] In the present invention, it is preferable that one end of the elongated annular breaking line (that is, the tab portion) is semicircular.

[0043] In this embodiment (including the second to fourth embodiments described below), the third cut pattern P3 is composed of two straight perforations parallel to each other, but in the present invention, the third cut pattern P3 may not be composed of only straight portions.

[0044] In this embodiment, the second slit pattern P2 may have slits a2 continuously formed in the longitudinal direction of the elongated ring shape within a range (D2) of 1 mm or less, starting from the other of the two side ends.

[0045] Furthermore, in this embodiment, a display E indicating an opening is printed in the area defined by the first slit pattern P1. In the present invention, the display E may be disposed inside the tab as shown in Fig. 3, or may be disposed outside the tab, for example, near the second slit pattern P2 on the top surface 12. Of course, the display E may be disposed both inside and outside the tab.

[0046] The display portion E may be a portion that evokes the image of a knob, such as the position of a knob or the display portion itself being a knob. Furthermore, the display portion E may be a color or pattern provided at the tip of the first cut pattern P1.

[0047] The stack of tissue paper 2 stored in the film packaging bag according to the present invention has a repeating structure in which one ply of tissue paper 2 is folded back, another ply is sandwiched between the folded back plies, and the other ply is then folded back again, and the topmost ply sandwiches the ply located directly below it, and is then folded back once more, forming a folded edge on the upper surface of the ply located directly below it.

[0048] Examples of the "repeated structure" include a two-fold repeated structure (C-hold), a three-fold repeated structure (Z-fold structure), or a repeated structure that combines these.

[0049] An example of a two-fold repeat structure (C-fold) is a repeat structure in which multiple plies are continuously folded by alternately sandwiching plies folded in a V-shape (C-shape) when viewed from the side so that they face each other. An example of a three-fold repeat structure is a repeat structure in which multiple plies are continuously folded by alternately sandwiching plies folded in a Z-shape when viewed from the side so that they face each other. An example of a repeat structure that combines these is a repeat structure in which multiple plies are continuously folded by alternately sandwiching plies folded in a V-shape (C-shape) and a Z-shape when viewed from the side.

[0050] The stack of tissue paper 2 stored in the film packaging bag 1p of this embodiment has a repeated two-fold structure in which multiple plies are continuously folded by alternately sandwiching V-shaped (C-shaped) plies facing each other in the internal space of the film packaging bag 1p.

[0051] In the manufacturing process of the bundle of tissue paper 2 to be housed in the film packaging bag according to the present invention, for example, a known folding device called an interfolder can be used.

[0052] Specific examples of materials for the flexible resin film packaging bag 1p that constitutes the exterior of the film packaging body 1 include polyethylene film, polypropylene film, polyester film, polyethylene terephthalate film, nylon film, vinylidene chloride film, and single-layer film of ethylene-vinyl alcohol copolymer, as well as laminate films containing these films, and gas barrier films obtained by applying surface treatments such as aluminum vapor deposition to these films. From an environmental perspective, it is desirable to use biomass films derived from plant materials such as sugarcane, potato (starch), and corn. From a cost perspective, polypropylene film and polyethylene film are preferred.

[0053] The film of the film packaging bag 1p constituting the exterior of the film packaging body 1 may be a matte film that has excellent design and feel, or, if scented tissue paper or other odorous items are to be packaged, an ethylene vinyl alcohol copolymer resin film or a polyethylene terephthalate resin film that has excellent aroma retention may be used. A multilayer resin film having improved heat-sealability may also be used by laminating a polyethylene resin film or a polypropylene resin film on one or both sides of the ethylene vinyl alcohol copolymer resin film or the polyethylene terephthalate resin film.

[0054] Conventionally, film packaging has been known in which sanitary tissue paper is folded and stored so that it can be removed in a pop-up manner.In this film packaging, for example, an opening line such as a perforation is provided on the top surface so that an elongated ring-shaped removal opening can be formed, and after the opening line is broken, the sanitary tissue paper can be removed through the removal opening (for example, Patent Document 1).

[0055] However, when the film of a film packaging body is broken along the tearing line to form an access opening, if one end of the area surrounded by the tearing line is pinched and pulled toward the other end, the uncut portion of the tearing line may not be cut, and the film of the film packaging body may tear starting from that uncut portion.

[0056] Therefore, in order to improve the ease of gripping the edge in the area surrounded by the tear line and the ease of breaking the tear line, it is possible to consider making a slit at both ends of the tear line.However, if the position and size of the slit are made without sufficient consideration, there is a possibility that the slit will cause the tear line to suddenly break during the film transport process of the film packaging, allowing foreign matter to be mixed inside.

[0057] According to this embodiment, by transporting the film so that the second cut pattern P2, which has a smaller cut, is at the front while improving the ease of gripping and tearing in the area surrounded by the opening broken line 12d, it is possible to prevent the opening broken line 12d from accidentally breaking due to a cut during the film transport process of the film packaging body 1.

[0058] To achieve the effects of the present invention, the width L of the elongated annular tearing broken line 12d in the short direction is preferably 3 to 7 mm, more preferably 4 to 6 mm. If the width L is less than 3 mm, the annular width is too narrow and the package may tear when opened. If the width L is more than 7 mm, foreign matter and dirt may easily get in during use. Furthermore, when removing sheets one by one, it may be difficult to remove the next sheet.

[0059] To achieve the effects of the present invention, it is preferable that the tear strength of the film constituting the film packaging 1 in the short direction of the elongated annular shape is greater than the tear strength in the long direction of the elongated annular shape. In this way, the tearing direction of the window (the area surrounded by the opening broken line 12d) and the tearing direction of the film are the same, and the film tears in a straight line between the perforations when opened, making it easy to open. If the tearing direction of the window and the tearing direction of the film were opposite (the tearing direction of the window and the tearing direction were different), the annular shape would easily tear during opening.

[0060] To achieve the effects of the present invention, the shape of both longitudinal ends of the elongated annular tearing line 12d is arc-shaped, and the radius of the arc is preferably 4 mm or less. For example, the arc may have a radius of 4 mm and a chord length of approximately 7 mm. In the present invention, the arc is not limited to a circle less than a semicircle, and may also be a semicircle. If the radius of the arc exceeds 4 mm, when forming perforations within the arc, the angle of the tearing direction relative to the tearing direction between the perforations becomes large, making the product more likely to tear.

[0061] To achieve the effects of the present invention, the length W2 of the elongated annular tearing line 12d in the longitudinal direction is preferably 80 to 90% of the sheet width W1 of the stored sanitary thin paper. If the sheet width W1 is more than 90%, the tearing opening may wrap around to the side due to misalignment when wrapping the packaging film. If it gets to the side, it will be heat-sealed, melting the perforations and causing tearing when opening. If the sheet width W1 is less than 80%, two sets of sheets may be pulled out when pulling out the next sheet.

[0062] To achieve the effects of the present invention, the three slit patterns P1, P2, and P3 of the tearing broken line 12d are preferably symmetrical with respect to the center line X1 along the longitudinal direction of the elongated ring. Having the same perforation pattern ensures that force is applied evenly to the target area at the same time during opening, allowing the opening to proceed linearly. If the perforation patterns were not symmetrical, force would be applied to only one side, resulting in a non-linear tearing direction, making the package difficult to tear and, in some cases, even tearing. In particular, near the second slit pattern P2, it is necessary to reliably guide the tearing direction to the cut portion at the very tip, and it is necessary to make the perforation uniform from both sides. (In other words, it is preferable that the perforation pattern, at least near the second slit pattern P2, be symmetrical with respect to the center line in the short direction.)

[0063] In order to achieve the effects of the present invention, the ratio of the cut portion a to the tear broken line 12d is preferably 55% or less, more preferably 40% or less. If the ratio of the cut portion a to the tear broken line 12d (in the MD direction of the film) exceeds 55%, the strength of the film is weakened, and the perforation may be partially opened during the manufacturing process or logistics process.

[0064] <Manufacturing method> In the film packaging 1 according to this embodiment, it is preferable to include a step of conveying the film packaging 1 so that the second slit pattern P2 is located on the downstream side (leading side) and the first slit pattern P1 is located on the upstream side (rear side). Here, the "downstream side" refers to the leading side in the conveying direction.

[0065] With this configuration, the sheet is conveyed so that the second slit pattern P2, which has a smaller slit, is at the front, and since the slit is small, it is possible to prevent the opening broken line 12d from being accidentally broken due to the small slit.

[0066] The film packaging 1 according to this embodiment can be manufactured as follows.

[0067] In the manufacturing method according to this embodiment, first, continuous sheets fed from multiple sheet rolls (not shown) are folded and stacked in the thickness direction to obtain a continuous sheet bundle, and then this continuous sheet bundle is cut at predetermined intervals to form individual sheet bundles, namely, tissue paper 2. The process up to obtaining such tissue paper 2 is mainly carried out by the folding mechanism and cutting device 20 and the feed-in device 30 described above.

[0068] Fig. 4 is a block diagram that schematically shows part of the manufacturing process of the film packaging 1 according to this embodiment. Specifically, Fig. 4 shows a series of steps from when the paper tissues 2 are brought in to when the collective package 6 is brought out, i.e., an example of a bringing-in step, an individual wrapping step, a conveying step, a collective wrapping step, and a carrying-out step. Note that Fig. 4 conceptualizes and simplifies each step to clearly show this series of steps, and does not reproduce the actual steps.

[0069] The individual packaging film F (raw packaging material FR) that forms the film packaging bag 1p is preferably a flexible packaging film formed from a resin such as polyethylene, polypropylene, polyvinyl chloride, polyester, or polyvinyl acetate. Among these, polyethylene is particularly preferred for the individual packaging film F. If the individual packaging film F were made of a relatively hard material such as polypropylene, the corners of the film packaging body 1 would come into contact with the exterior film 5 of the collective package, making the exterior film 5 more likely to tear and making it difficult to tightly package the collective package. For this reason, it is recommended to use a relatively soft film material such as polyethylene for the individual packaging film F. Polyethylene has the lowest stiffness compared to other resins at the same thickness, making it low-cost, has the lowest risk of damaging the exterior bag, and produces a tighter package, making polyethylene the most preferred material for the individual packaging. Note that even polypropylene, for example, becomes softer when the film is made thinner; therefore, the terms "relatively hard material" and "relatively soft material" used here refer to materials that are relatively hard or soft when compared at the same thickness.

[0070] As an index of flexibility of the individual packaging film F, it is preferable to set the bending stiffness of the sheet within a specific range. In this specification, the bending stiffness of the individual packaging film F is expressed as T, where T is the bending stiffness in the MD direction of the film, and Y is the bending stiffness in the CD direction. In this case, the bending stiffness T (MD direction) of the individual packaging film F is preferably 0.0014 to 0.0070 mN·m, more preferably 0.0018 to 0.0060 mN·m, and particularly preferably 0.0021 to 0.0054 mN·m. The bending stiffness Y (CD direction) of the individual packaging film F is preferably 0.0016 to 0.0075 mN·m, more preferably 0.0020 to 0.0065 mN·m, and particularly preferably 0.0023 to 0.0060 mN·m.

[0071] Furthermore, the bending stiffness of the individual packaging film F is represented by √TY, which is the geometric mean of the T value (MD direction) and the Y value (CD direction). In this case, the bending stiffness √TY of the individual packaging film F is preferably 0.0014 to 0.0060 mN·m, and particularly preferably 0.0022 to 0.0057 mN·m. The lower the √TY value, the softer the individual packaging film F. For this reason, the √TY value is preferably 0.0050 or less, and may be 0.0040 or less. There is no particular lower limit to the √TY value, but it should be 0.0001 mN·m or more, and is preferably 0.0010 mN·m or 0.0014 mN·m or more.

[0072] In this way, by using a relatively soft film with little bending stiffness, particularly a polyethylene film, as the individual packaging film F, the exterior film 5 is less likely to tear when multiple film packages 1 are collectively packaged in the exterior film 5.

[0073] The bending stiffness is determined by a method conforming to "Method for measuring deflection under its own weight, TAPPI UM409" described in "Paper and Pulp Testing Methods" (Paper and Pulp Technology Association).

[0074] More specifically, the bending stiffness of the individual packaging film F is expressed by the following formula.

[0075] [Formula] Bending stiffness (mN m) = (wL b 4 / 8y) x 9.81 where w is the basis weight (g / m 2 ), L b is the bending length (m), and y is the degree of deflection (m). The method for measuring the degree of deflection y is as follows:

[0076] [Measurement method] Prepare a sample piece of individual packaging film F with a width of 30 mm and a length of 150 mm. Place this sample piece at a right angle on a table, bending the tip of the individual packaging film F by 30 mm (bending length L b ) and place it on the table, hold the sample piece so that it does not float, and measure the vertical length of the hanging tip (degree of deflection y). Measurements are taken on the front and back of the individual packaging film F (n=10 each), and the average of a total of 20 points.

[0077] Furthermore, the winding direction (winding flow direction) of the packaging roll FR of the individual packaging film F is preferably the short-edge direction of the individual packaging film F (i.e., the width direction of the film packaging 1). By aligning the short-edge direction of the individual packaging film F with the flow direction of the packaging roll FR, the length of each design in the flow direction of the packaging roll FR can be reduced. Since the design is determined by the size of the printing roll of the printing equipment, a shorter design allows for more designs to be produced. Furthermore, since the pitch is short, more sheets can be produced with the same roll diameter, reducing the frequency of roll replacement. Furthermore, it is preferable that the packaging roll FR not have a design printed on the heat-sealed portion during packaging. This non-printed portion increases the spacing between the individual packaging films F, making it easier to cut the film between the individual packaging films F. Even if printing is required, the film cutting area should have a blank area of ​​at least 4 mm, preferably at least 10 mm, or a design area that looks natural regardless of the design. When printing the design on the packaging roll FR, a register mark (not shown) may also be printed. It is preferable to place the register mark on the heat-sealed part (cut surface) on the side, and furthermore, it should be the same color as the product (e.g., a stack of sanitary paper) (white for normal products, a mark of the same color for colored products).

[0078] Because the packaging material FR is made up of a plurality of individual packaging films F with different designs connected alternately, the individual packaging machine 40 sequentially wraps the paper tissues 2 using the individual packaging films F cut from the packaging material FR. Therefore, as shown in FIG. 4, film packages 1 with different designs, each covered with individual packaging films F with different designs, are sequentially discharged from the individual packaging machine 40. In the example shown in FIG. 4, the packaging material FR is supplied with a pattern in which two types of individual packaging films F are arranged alternately, and therefore, film packages 1 with two different designs are alternately discharged from the individual packaging machine 40 according to the pattern of the packaging material FR. In this way, the arrangement order of the film packages 1 discharged from the individual packaging machine 40 corresponds to the pattern of the individual packaging films F that make up the packaging material FR supplied to the individual packaging machine 40. Although different designs are produced in FIG. 4, the same design may be used in the present invention.

[0079] The individual packaging machine 40 cuts the packaging material FR between the individual packaging films F to obtain individual individual packaging films F, and then individually packages each of the paper tissues 2 carried in by the carry-in device 30 with these individual individual packaging films F. The individual packaging machine 40 sequentially packages the paper tissues 2 using the individual individual packaging films F obtained as described above. Any known individual packaging machine can be used as the individual packaging machine 40. Specifically, the individual packaging machine 40 may be configured to spread the opening of the individual packaging film F, and then, while maintaining the spread state of the individual packaging film F, push the paper tissues 2 through the opening into the individual packaging film F, and then join the individual packaging film F by heat sealing or the like. In this way, a film package 1 is obtained in which a bundle of paper tissues 2 is individually wrapped in the individual packaging film F.

[0080] Here, the direction parallel to the folds of each sheet of tissue paper 2 is referred to as the "width direction of tissue paper 2," the direction perpendicular to the width direction of tissue paper 2 in a plane (i.e., the direction in which tissue paper 2 is cut) is referred to as the "depth direction of tissue paper 2," and the direction in which tissue paper 2 sheets are stacked is referred to as the "thickness direction of tissue paper 2." Additionally, the "MD direction" of individual packaging film F refers to the flow direction (extrusion direction) during film production, and the "CD direction" of individual packaging film F refers to the direction perpendicular to this flow direction. Because the MD direction of a film is parallel to the film's molecular orientation, general films have the property of being easily torn in the MD direction. On the other hand, because the CD direction of a film is perpendicular to the film's molecular orientation, general films have the property of being difficult to tear in the CD direction.

[0081] In this embodiment, the width direction of the paper tissue 2 and the MD direction of the individual packaging film F coincide, and the depth direction of the paper tissue 2 and the CD direction of the individual packaging film F coincide. Therefore, in this example, the tear strength of the individual packaging film F (JIS K7128-2:1998 Testing method for tear strength of plastic films and sheets) is preferably greater in the depth direction of the paper tissue 2 (CD direction of the individual packaging film F) than in the width direction of the paper tissue 2 (MD direction of the individual packaging film F). In other words, it is preferable that the individual packaging film F be easily torn along the width direction of the paper tissue 2. In particular, the tear strength in the depth direction of the paper tissue 2 is preferably three times or more, and more preferably five times or more, the tear strength in the width direction of the paper tissue 2 (tear strength: width direction × 5 ≦ depth direction). Therefore, forming the tear break line 12d in the individual packaging film F along the width direction of the paper tissue 2 has the advantage of making the tear break line 12d easier to open.

[0082] That is, in this embodiment, the direction in which the film is likely to tear is the MD direction (the direction in which the elongated ring extends), and the film is rotated once by 90 degrees and wound (feeded from the side and wrapped).

[0083] Furthermore, the individual packaging film F stretches more easily in the depth direction (CD direction) of the paper tissue 2 than in the width direction (MD direction) of the paper tissue 2. The tensile elongation (tensile strain) (JIS K7127) indicates the degree to which a film stretches easily, and is the percentage of elongation (%) at which the film reaches the first yield point or breaks without reaching the yield point at a speed of 300 mm / min. Therefore, when wrapping the paper tissue 2 in the individual packaging film F, the individual packaging film F stretches easily in the pushing direction of the individual packaging film F, which has the advantage that the paper tissue 2 fits easily into the individual packaging film F when individually wrapped.

[0084] When considering the formation of the tear-opening broken line 12d, it is preferable to align the width direction of the tissue paper 2 with the MD direction of the individual packaging film F, and to set the proportion of the cut portion a of the tear-opening broken line 12d to 55% or less, and more preferably 40% or less.

[0085] In this way, the tissue paper 2 is individually wrapped in the individual wrapping film F to obtain the film packaging 1. The film packaging 1 may be formed by covering both end faces of the bundle of tissue paper 2 with the film packaging 1 and joining the covered portions of the end faces by heat sealing or the like to form side seal portions. By forming side seal portions in the film packaging 1 in this way, it is possible to cover almost the entire bundle of tissue paper 2.

[0086] In the present invention, it is preferable to form the perforation pattern (opening broken line 12d) during the packaging process. Although it is possible to form the perforations during the film material process, the flow of the film is reversed during the film material manufacturing process (film winding direction) and the packaging process (film unwinding direction). Therefore, if the perforation pattern is formed in the MD direction, the tab side may become the leading side in one of the processes, causing the film to turn up. For this reason, it is most desirable to form the perforation pattern within the packaging process equipment and position the tab side at the rear.

[0087] Second Embodiment In the second embodiment of the present invention, unlike the first embodiment, the second slit pattern P'2 has uncut portions b'2, and the length of the uncut portion b'2 near the other of the longitudinal ends of the elongated ring is 1 mm or less. Here, the length of the uncut portion b'2 refers to the length in the extension direction of the uncut portion b'2.

[0088] 3(b) is a plan view showing the broken line when viewing the top surface of the film packaging according to the second embodiment of the present invention, focusing on the other periphery of both ends of the elongated annular broken line 12'd in the longitudinal direction. Of the elements constituting the film packaging according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0089] As shown in FIG. 3(b), it can be seen that the second slit pattern P'2 (in the range D'2) includes an unslit portion b'2.

[0090] Also in this embodiment, the three slit patterns P1, P'2, and P'3 of the opening broken line 12'd are symmetrical with respect to the center line X1 along the longitudinal direction of the elongated ring shape.

[0091] According to this embodiment, in addition to achieving the same effect as the first embodiment, the length of the uncut portion b'2 closest to the other of the two longitudinal end portions of the elongated ring is short, at 1 mm or less, so when the elongated ring is pinched from one side of both longitudinal end portions to open it, the possibility of the packaging film tearing at the other of the longitudinal end portions due to the uncut portion can be further reduced.

[0092] In FIG. 3(b), as an example, the length L of the elongated annular cut portion a′2 in the short direction is a'2 As shown in FIG. 3(b), the length L of the elongated annular second slit pattern P'2 (in the range D'2) in the short direction is a'2It can be seen that the width of the perforations of the third slit pattern P'3 (the length L of the elongated annular opening broken line 12'd in the transverse direction) is shorter than the width of the perforations of the third slit pattern P'3. a'2 When the tearing angle becomes smaller, the orientation of the uncut perforation b'2 of the second cut pattern P'2 at the end of the uncut portion b'2 becomes larger relative to the tearing direction, but because the uncut portion b'2 is short, it immediately reaches the cut portion a'2 when tearing along the opening broken line 12'd from the left side of Figure 3(b), thereby further reducing the possibility of the packaging film tearing due to the uncut portion.

[0093] <Third embodiment> In the third embodiment of the present invention, unlike the first embodiment, the length in the short direction of the elongated ring of the slits a1 and a''2 formed at one or the other of both longitudinal ends of the elongated ring of the opening broken line 12''d is 2.5 mm or more. In other words, the length in the short direction of the elongated ring of the slits a1 and a''2 is smaller than the width of the perforations of the third slit pattern P3.

[0094] 3(c) is a plan view showing the broken line for opening when viewing the top surface of the film packaging according to the third embodiment of the present invention, focusing on the other periphery of both longitudinal ends of the elongated annular shape of the broken line for opening 12''d. Of the elements constituting the film packaging according to this embodiment, those having similar functions are given the same reference numerals as in the first embodiment, and their description will be omitted.

[0095] In FIG. 3(c), as an example, the length L of the elongated annular cut portion a2 in the short direction is a''2 As shown in FIG. 3(c), the length L in the short direction of the elongated annular shape of the second slit pattern P''2 (in the range D''2) is a''2 However, it can be seen that this is shorter than the width of the perforations of the third slit pattern P''3 (the length L in the short direction of the elongated annular opening broken line 12''d).

[0096] As shown in FIG. 3(c), the second slit pattern P''2 (in the range D''2) includes an uncut portion and a slit other than the slit a''1 at the other end. In the present invention, the second slit pattern P''2 may not include an uncut portion and may include only the slit a''1 at the other end.

[0097] Also in this embodiment, the three slit patterns P1, P''2, and P3 of the opening broken line 12''d are symmetrical with respect to the center line X1 along the longitudinal direction of the elongated ring shape.

[0098] According to this embodiment, in addition to achieving the same effects as the first embodiment, the length of the cut portions a1, a''2 formed at one or the other of both ends of the elongated ring-shaped longitudinal direction of the opening broken line 12''d is short in the short direction of the elongated ring-shaped, so that it is possible to prevent the opening broken line 12d from suddenly breaking due to a cut during the film conveying process of the film packaging body 1.

[0099] Furthermore, if the short cut a''2 is formed on the other of the two longitudinal ends of the elongated ring shape of the opening broken line 12''d, the possibility of the packaging film tearing at the other of the longitudinal end ends can be further reduced when the elongated ring shape is pinched from one side of both longitudinal end ends to open it.

[0100] In order to achieve the effects of the present invention, the length in the short direction of the elongated ring of the cut portions a1, a''2 formed at one or the other of both longitudinal ends of the elongated ring of the opening broken line 12''d is preferably 2.5 mm or more, more preferably 3.5 mm or more.

[0101] <Fourth embodiment> In the fourth embodiment of the present invention, unlike the first embodiment, the second slit pattern P'''2 has a substantially linear slit a'''2 extending in the short direction of the elongated ring at the other of both side ends of the elongated ring. In other words, the tab portion has a rectangular shape, and this configuration prevents the sheet from rolling up during transportation in the manufacturing process. Here, "substantially linear" may mean a straight line or may be slightly curved.

[0102] 5(a) is a plan view showing the tear-open broken line 12'''d when viewing the top surface of the film packaging according to the fourth embodiment of the present invention. Of the elements constituting the film packaging according to this embodiment, those having similar functions are given the same reference numerals as in the first embodiment, and descriptions thereof will be omitted.

[0103] According to this embodiment, in addition to achieving the same effect as the first embodiment, since there is no uncut portion on the other side of both longitudinal ends of the elongated ring shape of the opening broken line 12'''d, the possibility of the packaging film tearing on the other side of both longitudinal ends when the elongated ring shape is pinched and opened from one side of both longitudinal ends can be further reduced.

[0104] In order to achieve the effects of the present invention, the length L of the substantially linear cut portion a'''2 a '''2 is preferably ±20%, more preferably ±10%, of the width in the short direction of the elongated annular perforation of the third cut pattern P'''3 adjacent to the approximately linear cut portion a'''2. If it is less than -20%, the angle of the perforation relative to the tearing direction becomes too large, causing the tears between the perforations to shift and resulting in tearing.

[0105] Fifth Embodiment In the fifth embodiment of the present invention, unlike the first embodiment, the cut a''''3 of the perforation of the third cut pattern P''''3, which is adjacent to the approximately linear cut a''''2, is inclined toward the other of both side ends of the elongated ring and the center line X1 along the longitudinal direction of the elongated ring.

[0106] Figure 5(b) is a plan view showing the opening dashed line 12''''d when looking at the top surface of the film packaging according to the fifth embodiment of the present invention, focusing on the other periphery of both longitudinal ends of the elongated ring-shaped opening dashed line 12''''d. Of the elements constituting the film packaging according to this embodiment, those having similar functions are given the same symbols as in the first embodiment and their description will be omitted.

[0107] According to this embodiment, in addition to achieving the same effects as the first and fourth embodiments, the cut portion a''''3 of the third cut pattern P''''3 is inclined to guide it toward the cut portion a''''2 of the second cut pattern P''''2, so that when the elongated ring-shaped package is opened by pinching it from one side of both longitudinal ends, it is smoothly torn all the way to the end on the other side of both longitudinal ends, further reducing the possibility of the packaging film tearing on the other side of both longitudinal ends.

[0108] <Evaluation> Table 1 shows the evaluation results of the elongated annular tear-off lines formed on the film packaging in the examples according to the present invention and the comparative examples.

[0109] In Examples 1-10, one side and the other side (grip portion and anti-grip portion) of the elongated annular opening broken line are semicircular; in Examples 11-13, one side (grip portion) of the elongated annular opening broken line is semicircular and the other side (anti-grip portion) is rectangular; and in Comparative Example 1-6, one side and the other side of the elongated annular opening broken line are semicircular.

[0110] [Table 1]

[0111] In the "Common" section of Table 1, "Width" refers to the width of the window (depth direction), "Perforation Length" refers to the length of the window (width direction), and "Perforation Orientation" refers to the direction of the film relative to the opening direction of the perforation. Also, in the "Tab" section of Table 1, "Shape" refers to the orientation of the tip of the tab, and "Length" refers to the length of the tab (the length in the longitudinal direction of the elongated ring). For example, R3 indicates a semicircular shape with a radius of 3 mm. Furthermore, in the "anti-grip" section of Table 1, "shape" refers to the shape of the anti-grip portion, "length" refers to the length of the anti-grip portion (the length in the longitudinal direction of the elongated ring), "maximum width at the apex" refers to the cut width at the apex (tip) of the anti-grip portion (the length in the lateral direction of the elongated ring), "uncut immediately before" refers to the length of the uncut portion immediately before the cut portion at the tip, and "cut rate" (%) refers to the opening rate of the broken opening line in the anti-grip portion, and is calculated by dividing the total length of the cut portion in the anti-grip portion by the total length of both the cut portion and uncut portion in the anti-grip portion, and multiplying this by 100.

[0112] In Table 1, the product evaluation was conducted on the items of "ease of opening," "edge tearing," "ease of removal of tissue paper," "foreign matter contamination," and "perforation tearing," while the production evaluation was conducted on the items of "soil contamination" and "perforation tearing," with "x," "△," "○," and "◎." "△," "○," and "◎" were considered acceptable.

[0113] <Other> The present invention is not limited to the above-described embodiments or the modifications described throughout, and appropriate changes and modifications can be made without departing from the technical concept of the present invention. [Explanation of symbols]

[0114] 1 Film packaging 1p film packaging bag 12 Top 12d Opened broken line P1 First cutting pattern P2, P'2, P''2, P'''2, P''''2 Second cut pattern P3, P'3, P''3, P'''3, P''''3 Third cut pattern a, a1, a2, a'2, a''2, a'''2, a''''2, a3 cut b, b'2, b3 Unbroken part X1: Center line along the longitudinal direction of the elongated ring X2 Center line along the short side of the elongated ring W1 Sheet width of sanitary tissue paper W2: Length of the elongated ring-shaped film packaging body 1 in the longitudinal direction L: Length of the elongated ring in the short direction 12o outlet 13 Long side 14 Short side 2 tissue paper

Claims

1. A film packaging body in which sanitary tissue paper is folded and stored in a pop-up style so that it can be removed, a tear-opening broken line that can form an elongated annular outlet on the top surface, the tear-opening broken line being composed of a cut portion and an uncut portion; the opening broken line of the elongated annular shape is composed of a first slit pattern formed at one of both longitudinal end portions of the elongated annular shape, a second slit pattern formed at the other of both longitudinal end portions of the elongated annular shape, and a third slit pattern consisting of perforations connecting the first slit pattern and the second slit pattern; In the first cut pattern and the second cut pattern, the uncut portion is not provided at both side ends of the elongated annular shape, In the first slit pattern, the slits are continuously provided in a range of 4 to 8 mm in the longitudinal direction of the elongated annular shape, starting from one of the both side ends; The film packaging body is characterized in that the second cut pattern has cut portions that are continuous in the longitudinal direction of the elongated ring shape within a range of 3 mm or less, starting from the other of the two side ends.

2. The film packaging body according to claim 1, characterized in that the second cut pattern has cut portions continuously arranged in the longitudinal direction of the elongated ring shape within a range of 1 mm or less, starting from the other of the two side ends.

3. 2. The film packaging according to claim 1, wherein an indication indicating an opening is printed in the area defined by the first cut pattern.

4. 2. The film packaging according to claim 1, wherein the width of the elongated annular tear-opening broken line in the short direction is 3 to 7 mm.

5. 2. The film packaging according to claim 1, wherein the film constituting the film packaging has a tear strength in the short direction of the elongated ring shape that is greater than the tear strength in the long direction of the elongated ring shape.

6. 2. The film packaging according to claim 1, wherein both longitudinal ends of the elongated annular tear-opening line are arc-shaped, and the radius of the arc is 4 mm or less.

7. The film packaging body according to claim 1, characterized in that the length of the elongated ring in the longitudinal direction is 80 to 90% of the width of the stored sanitary thin paper sheet.

8. 2. The film packaging according to claim 1, wherein the three cut patterns of the tear-open broken line are symmetrical with respect to a center line along the longitudinal direction of the elongated ring.

9. The film packaging body described in claim 1, characterized in that the second cut pattern has the uncut portion, and the length of the uncut portion closest to the other of the longitudinal end ends of the elongated ring is 1 mm or less.

10. 2. The film packaging body according to claim 1, wherein the length of the slit formed at one or the other of both longitudinal ends of the elongated ring in the short direction of the elongated ring is 2.5 mm or more.

11. 2. The film packaging according to claim 1, wherein the ratio of the cut portion to the tear line is 55% or less.

12. The film packaging body according to claim 1 , wherein the second cut pattern has a substantially linear cut portion extending in the short direction of the elongated ring at the other of the two side ends of the elongated ring.

13. The film packaging body described in claim 12, characterized in that the length of the approximately straight cut portion is ±20% of the width in the short direction of the elongated annular perforation of the third cut pattern that is adjacent to the approximately straight cut portion.

14. The film packaging body described in claim 12, characterized in that the slit of the third slit pattern that is adjacent to the approximately linear slit is inclined toward the other of both side ends of the elongated ring and toward the center line along the longitudinal direction of the elongated ring.

15. A method for producing the film packaging body according to any one of claims 1 to 14, conveying the film packaging so that the second cutting pattern is located downstream and the first cutting pattern is located upstream; A manufacturing method comprising:

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