Package

Abstract

To provide a package of film packaging excellent in openability.SOLUTION: A package is obtained by packaging a sanitary tissue paper bundle with a soft resin packaging film. The package includes a take-out port formation part formed by arranging an easy-to-cut opening line in a ring shape on an upper surface. At least one end edge of the take-out port formation part in a width direction is formed of the easy-to-cut opening line in which a cut part and a half cut part are arranged alternately.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a package in which a stack of folded sanitary tissue paper such as paper towels is wrapped in a flexible packaging film. [Background technology]

[0002] A known packaging form for sanitary thin paper such as paper towels and facial tissues is a so-called pop-up stack in which one or more plies are folded and stacked, and when the top sheet is picked up and pulled out, part of the next sheet is pulled out, and the stack is then packaged in a flexible plastic packaging film.

[0003] Traditionally, such sanitary tissue paper packages have typically had a simple linear perforation for forming the access opening, with a slit-shaped access opening on the top surface. However, with a slit-shaped access opening, if the slit length is long, sheets can fall inside when there are only a few sheets left inside. If the slit length is short, it can be difficult to pull the first sheet out of the film after opening. Furthermore, if the slit length is too high at the beginning or end of use, the resistance to pulling can become so high that the entire packaging film can lift up when pulling out a sheet, making it impossible to pop up.

[0004] Therefore, in order to solve the problem of this slit-shaped outlet, perforations for forming the outlet are arranged in an elongated ring shape extending in the longitudinal direction using a cutting technique such as die-cutting, so that the outlet has width in the depth direction like a substantially oval-shaped outlet (see Patent Documents 1 and 2 below).Furthermore, in recent years, in order to further improve the ease of taking out the product, the outlet has also been made substantially gourd-shaped, with the widthwise ends widened.

[0005] However, conventional roughly oval-shaped or gourd-shaped outlets place importance on softness and flexibility, and are designed primarily for sanitary thin paper such as facial tissue paper, which is primarily used for facial purposes such as blowing your nose or wiping around the mouth while eating. They are not necessarily suitable for tissue paper that is "thick, sturdy, and tear-resistant" so that it can also be used to wipe skin other than the face or for wiping objects, or for sanitary thin paper such as paper towels, which are more rigid than facial tissue paper and are primarily used to dry hands after washing.

[0006] One way to improve the ease of removing such sanitary tissue paper is to make the removal opening wider in the depth direction, but due to differences in paper quality, it is difficult to design sanitary tissue paper with high rigidity in the same way as facial tissue paper, which is soft and flexible. Simply making the removal opening wider in the depth direction makes it very likely to cause pop-up problems, where the next piece of sanitary tissue paper does not rise up but falls, or to fail to stand up on the top surface of the package.

[0007] On the other hand, for example, in the approximately oval-shaped outlet forming portion 105 shown in Fig. 9(a), in which the perforations 150 are formed in a ring shape using a die-cutting technique such as die-cutting, an outlet forming portion 105 has the advantage that an outlet can be easily formed by cutting and peeling the area 105Z within the ring perforation from one end 105A to the other end 105B in the longitudinal direction X, as shown in Fig. 9(b). However, when performing such an opening operation, the direction in which the perforation 150 tears at the other end 105B approaches the perforation 150e at the other end that is last to be torn off approaches a direction perpendicular to the direction in which the area 105Z within the ring perforation is pulled. Therefore, as shown in Fig. 9(c), the tearing of the perforation 150 does not occur smoothly and continuously at this end, particularly near the perforation 150e at the end 105B, and an unintended tear 105P may occur at the end of the outlet 106, as shown in Fig. 9(d). In the outlet forming portion 105 formed by arranging the perforations 150 in a ring shape, as the widthwise end portion is widened in the depth direction Y, the range of the perforations that approaches the direction perpendicular to the tearing direction becomes longer, making this tearing more likely to occur. Therefore, an outlet forming portion that is roughly gourd-shaped and has widened ends is more likely to tear 105P.

[0008] Furthermore, such tears 105P are more likely to occur when the packaging film is a uniaxially stretched film that is stretched in a direction Y perpendicular to the longitudinal direction X of the outlet forming section 105. In particular, such tears are more likely to occur in packages in the form of pillow packaging or gusset packaging, since the stretch direction of the packaging film is generally perpendicular to the longitudinal direction of the outlet forming section. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2018-052559 [Patent Document 2] Japanese Patent Application Publication No. 2018-058654 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, in view of the above problems, the main object of the present invention is to provide a film-packaged package that is easy to open, with the widthwise edges of the opening not easily torn when opened, and that is also easy to pull out sanitary tissue paper, particularly hard sanitary tissue paper such as paper towels. [Means for solving the problem]

[0011] The means for solving the above problems are as follows. The first means is A package in which a bundle of sanitary tissue paper is wrapped in a flexible resin wrapping film, An outlet forming portion is formed by arranging an easy-to-tear line in an annular shape on the upper surface, the outlet forming portion has a shape including a narrow portion extending in the width direction at a center portion in the depth direction, and a curved convex portion bulging outward in the width direction at at least one end portion in the width direction, 80% or more of the area constituting the edge of the narrow portion of the curved convex portion is a perforation in which cut portions and uncut portions are alternately arranged. The packaging body is characterized by the above.

[0012] The second method is In the package according to the first aspect, the half-cut portion is cut to a depth of 20% or more of the thickness of the packaging film.

[0013] The third method is The outlet forming portion has a shape including a narrow portion extending in the width direction at a center portion in the depth direction, a wide portion continuing from an end of the narrow portion toward the outside in the width direction and gradually widening as it moves away from the narrow portion, and a curved convex portion continuing from the wide portion and bulging outward in the width direction, This is a packaging body relating to the first or second means, in which the portion constituting the edge of at least one of the curved convex portions of the easy-to-tear line has a portion in which cut portions and half-cut portions are arranged alternately.

[0014] The fourth method is In the package according to the third aspect, 80% or more of the area constituting the edge of the curved convex portion is an area where the cut portions and half-cut portions are alternately arranged.

[0015] The fifth method is In the package according to the third means, the length of the curved convex portion in the depth direction is 25 to 45 mm, and the bulging length in the width direction is 2.5 to 12.5 mm.

[0016] The sixth method is The easily tearable line is a packaging body relating to the third means described above, in which the part that forms the edge of the widened portion that is continuous with the curved convex portion having a portion where cut portions and half-cut portions are arranged alternately has a portion where cut portions and half-cut portions are arranged alternately.

[0017] The seventh method is The packaging body according to the third to sixth means is such that the widthwise length of the outlet forming portion is 70% or more of the widthwise length of the top surface of the stack, the maximum depthwise length is 10 to 40% of the depthwise length of the top surface of the stack, the widthwise length of the narrow portion is 50 to 70% of the widthwise length of the top surface of the stack, and the depthwise length is 0.5 to 10% of the depthwise length of the top surface of the stack. [Effects of the Invention]

[0018] According to the present invention, a film-packaged package is provided which has excellent openability, with the edge of the outlet in the width direction being less likely to tear when opened, and which also has excellent pull-out properties for sanitary tissue paper, particularly hard sanitary tissue paper such as paper towels. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view illustrating a packaging body according to the present invention. [Figure 2] FIG. 2 is a perspective view illustrating a tissue paper stack. [Figure 3] FIG. 10 is a top view illustrating the outlet forming portion. [Figure 4] FIG. 1 is a perspective view illustrating a mode of use of a packaging body according to the present invention. [Figure 5] FIG. 4 is a partially enlarged view for explaining the outlet forming portion. [Figure 6]FIG. 4 is a schematic diagram for explaining a half-cut portion. [Figure 7] 10A and 10B are diagrams for explaining another example of the outlet forming portion. [Figure 8] 10A and 10B are diagrams illustrating other examples of the shape of the outlet forming portion. [Figure 9] FIG. 10 is a diagram illustrating a conventional outlet forming portion. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described below with reference to Figures 1 to 8, which show embodiments of the present invention. Note that directions such as up-down and left-right in the present invention and this specification may change depending on the orientation of the packaging body, and do not refer to absolute directions in space. Furthermore, stiffness may also refer to the stiffness, rigidity, or stiffness of paper.

[0021] The packaging body 1 according to the present invention is a bundle 3 of folded and stacked sanitary tissue paper 2 such as paper towels, wrapped in a flexible packaging film 4, and has an outlet forming portion 5 on its top surface 4C. The packaging body 1 has a substantially hexahedral shape, with a top surface 4C, a bottom surface 4D facing the top surface 4C, and long and short sides 4B and 4A located between the top surface 4C and the bottom surface 4D, so as to roughly approximate the shape of the bundle 3.

[0022] 1 to 4 show an embodiment of a gusset package. This gusset package is a pillow package with a gusset. The bundle 3, which is the packaged item, is wrapped in a packaging film 4 by wrapping it into a cylindrical shape so that openings are formed at both longitudinal ends. The overlapping portion 4X in the wrapping direction is bonded to the bottom of the bundle 3 by fusion or adhesive. The edges of the portion extending beyond the short side 3A of the bundle 3 are bonded from above and below by fusion or adhesive while forming a gusset, so that the short side 4A becomes the sealed surface. In this gusset package, the sealed surface, which is the short side 4A, faces the short side 3A of the bundle 3, and the long side 4B, which is the gusset, faces the long side 3B, which is the folded surface of the bundle 3. However, the packaging form of the package 1 is not limited to this invention. It may be a simple pillow package without a gusset, or other suitable packaging forms, such as an overlapping package, also known as a caramel package, in which the short side 4A is formed by overlapping and fusion-bonding flaps.

[0023] The stack 3 of sanitary thin papers 2 contained in the package 1 according to the present invention is a so-called pop-up stack. As shown in Figure 2, this stack 3 is made by folding a rectangular sanitary thin paper 2 in half and stacking multiple sheets of sanitary thin paper 2 so that the folded-back pieces 2B of the other sanitary thin papers 2 above and below are positioned on the inner fold 2A of the folded-back piece. The stack 3 has a substantially rectangular parallelepiped shape with a pair of long sides 3B along which the folded-back edges 2C of the sanitary thin papers 2 are aligned, a pair of short sides 3A along which the folded-back edges 2C are not aligned, and a pair of flat surfaces (upper and lower surfaces) 3C connected to the short sides 3A and the long sides 3B.

[0024] The number of sets of sanitary thin paper 2 constituting the bundle 3 is not limited, but can be 30 to 240 sets, with one ply or multiple plies constituting one set. The size of the bundle 3 is also not limited, but a bundle of 200 sets of sanitary thin paper is preferably 30 to 100 mm high, 150 to 250 mm wide, and 100 to 130 mm deep. Furthermore, the effect of the present invention in improving pop-up defects is enhanced when the bundle height is shorter than the length of the top surface of the bundle in the depth direction.

[0025] The filling rate of the bundle 3 in the packaging body 1 is not limited as long as it does not impede the effects of the present invention, but it is desirable that the gap between the bundle and the packaging film be in the range of 0 to 30 mm. The bundle 3 may be packaged in a state in which it is slightly compressed in the vertical direction by the packaging film. Note that the packaging body 1 according to the present invention is not limited to cases in which the sanitary thin paper contained therein, known as pocket tissues or the like, is tissue paper, and the number of sets is about 10 to 12 sets, and the set is popped up to a height of about 10 mm and can be removed.

[0026] Each sanitary tissue paper 2 constituting the bundle 3 has a single-layer structure with one sheet or a laminate structure with multiple sheets stacked on top of each other. The number of plies is not limited, but a single-ply or two-ply structure is preferable. The basis weight per ply is not limited, but is 13 to 40 g / m 2 It is desirable that the weight per set be 1.0 to 2.5 g. Sanitary tissue paper with one or two plies of sheets of this basis weight is particularly suitable for paper towels suitable for wiping hands after hand washing. Furthermore, it is desirable that the thickness of this sanitary tissue paper per set be 100 to 500 μm. Sanitary tissue paper with such a number of plies, basis weight, and thickness is highly effective in improving pop-up defects, in which the next sanitary tissue paper does not lift up but falls when popped up, and stand-up defects, in which the next sanitary tissue paper does not rise up but falls over on the top surface of the package, due to the configuration of the present invention, particularly the characteristic shape of the outlet-forming portion having a narrow portion, a wide portion, and a curved convex portion.

[0027] The basis weight is measured according to the method of JIS P 8124 (1998). The basis weight per ply can be calculated by the formula: basis weight = sheet weight per set / (sheet area x number of plies). The paper thickness is measured under the same conditions as in JIS P 8111 (1998), after the test piece has been thoroughly conditioned, using a dial thickness gauge (thickness measuring instrument) "PEACOCK G-type" (manufactured by Ozaki Seisakusho Co., Ltd.) or an equivalent device, in a multi-ply state.

[0028] Furthermore, the sanitary tissue paper 2 according to the present invention is a dry type that has been dried, and is not a so-called wet type that is impregnated with a chemical solution. Therefore, the bundle 3 formed from the sanitary tissue paper 2 contains a lot of air. Even this dry type sanitary tissue paper 2 can be of a chemical solution impregnated type, in which a chemical solution such as a moisturizing component that increases moisture by absorbing moisture, such as polyols typified by glycerin, is impregnated, and such sanitary tissue paper may also be used.

[0029] The raw material pulp constituting the sanitary thin paper 2 is not limited. Examples include a blend of pulp derived from a coniferous tree such as NBKP and pulp derived from a hardwood such as LBKP. It may also contain recycled paper pulp, or may consist solely of recycled paper pulp. In the present invention, particularly excellent effects are exhibited in sanitary thin paper with high stiffness, such as paper towels, so it is preferable that the pulp content is more than 50%.

[0030] The dry tensile strength of the sanitary thin paper 2 is not limited, but a value of 1000 to 3000 cN / 25 mm in the machine direction and 250 to 1500 cN / 25 mm in the cross direction is particularly suitable for the present invention. The dry tensile strength is measured according to JIS P8113 (1998). Examples of measuring devices include the "Universal Tension and Compression Tester TG-200N" manufactured by Minebea Co., Ltd. and its equivalents.

[0031] The outlet forming section 5 is formed by arranging an annular tear line 50 on the top surface 4C of the packaging film 4 facing the topmost sanitary thin paper 2 of the stack 3. This outlet forming section 5 tears open the tear line 50 and separates and removes the area surrounded by the tear line 50, thereby forming an outlet 6, an opening for withdrawing the sanitary thin paper 2, on the top surface 4C of the package 1. In the package 1 according to the present invention, the stack 3 is a pop-up type, so when the topmost sanitary thin paper 2 of the stack 3 is withdrawn through the formed outlet, a portion of the next sanitary thin paper located immediately below it is exposed through the outlet. Furthermore, because the outlet forming section 5 has an annular tear line 50, the outlet 6 formed by separating and removing the area surrounded by the tear line 50 is not a slit shape that is only linear, but has a certain width in the depth direction. Such an outlet forming section 5 has excellent operability when opening, because the film within the area within the outlet forming section 5 can be separated and removed by continuously pulling and tearing the area surrounded by the easy-to-tear line 50 from one end 5A to the other end 5B. In this specification, the end located on the left side of the drawing will be described as one end 5A and the end located on the right side as the other end 5B, but this is defined merely for convenience of explanation, and these can be interchanged.

[0032] 1 to 5 shows a package 1 having a gourd-shaped access opening 5, which is a particularly preferred shape. This access opening 5 has a narrow portion 51 extending widthwise at the center of the depth direction of the top surface 4C, a wide portion 52 continuing from the end of this narrow portion 51 and gradually widening away from the narrow portion 51 toward the outside of the width direction of the bundle 3, and a curved convex portion 53 continuing from this wide portion 52 and bulging outward in the width direction of the bundle 3.

[0033] The widened portion 52 is preferably arranged so that the angle of the easily splittable line 50 with respect to the width direction gradually increases toward the outside of the bundle 3 in the width direction. The easily splittable line 50 that forms the edge of the widened portion 52 preferably has a taper angle ∠α with respect to the width direction of 25 to 60 degrees.

[0034] It is also desirable that the easy split line 50 be formed in a curved line and smoothly connected from the widened portion 52 to the curved convex portion 53. When the easy split line 50 is arranged in this manner, the easy split line 50 can be easily split smoothly from the widened portion 52 to the curved convex portion 53.

[0035] 1 to 5, the outlet 6 formed by the outlet forming unit 5 has a generally trapezoidal free edge piece 51A that can move easily up and down near the edge extending from the narrow portion 51 to the wide portion 52, so that, as shown in Figure 4 in particular, when a set of sanitary thin paper sheets 2 is pulled out from the stack 3, the edge piece 51A deforms so as to curl up slightly in the direction of pulling, and leans against and supports the next exposed set of sanitary thin paper sheets 2. Furthermore, the outlet 6 formed by the outlet forming unit 5 deforms so that the root portion 2R of the next sanitary thin paper sheet, which follows the sanitary thin paper sheet pulled out from the stack 3 and is partially exposed from the outlet 6, is rolled up along the edge 6E of the curved convex portion 53, making it easy for the base portion 2R to deform into a highly upright columnar shape. Furthermore, the area between the widened portion 52 and the curved convex portion 53 of the outlet forming portion 5 forms a recessed portion 6H when the outlet 6 is formed. This allows the root portion 2R of the next sanitary thin paper, partially exposed through the outlet 6, to fit into this recessed portion 6H, enhancing its uprightness. In particular, this outlet forming portion 5 reduces pop-up failures caused by the sanitary thin paper collapsing inside the packaging film, which is believed to occur when the sanitary thin paper is highly rigid. This effect is particularly effective when combined with sanitary thin paper of the above-described preferred basis weight and thickness, as well as with a preferred packaging film, as described below. However, the outlet forming portion 5 of the present invention may have a shape without the widened portion 52, as shown in FIG. 7 . Furthermore, the outlet forming portion 5 may have a linear tear line connected to the annular tear line, as long as the effect of the present invention is not impaired.

[0036] In addition, in the shape of the outlet forming section 5 having the narrow portion 51, the wide portion 52, and the curved convex portion 53 as shown in Figures 1 to 5, it is particularly desirable that the widthwise length L1 of the entire outlet forming section 5 is 70% or more of the widthwise length L2 of the top surface of the bundle 3, the maximum depthwise length L3 of the entire outlet forming section 5 is 10 to 40% of the depthwise length L4 of the top surface of the bundle 3, the widthwise length L5 of the narrow portion is 50 to 70% of the widthwise length L2 of the top surface of the bundle 3, and the depthwise length L6 of the narrow portion is 0.5 to 10% of the depthwise length L4 of the top surface of the bundle 3. This shape of the outlet forming section 5 forms the curved convex portion 53, which is particularly wide in the depthwise direction. In addition, the free edge piece 51A formed near the edge of the narrow portion 51 is wider and larger, allowing the narrow portion 51 to open widely when pulling out. This allows the sanitary tissue paper 2 to be pulled out smoothly from the bundle 3. In particular, in packaging forms such as gusset packaging and pillow packaging in which it is difficult to form a clear fold line at the boundary between the short side surface 4A and the top surface 4C and the packaging film at the top surface of the package 1 is prone to deformation, or in which the sanitary tissue paper contained therein is highly rigid sanitary tissue paper 2 such as paper towels with the above-mentioned basis weight and thickness, which is prone to deforming the top surface of the package 1 when pulled out, the entire top surface is likely to remain flat and less likely to distort when the sanitary tissue paper 2 is pulled out, making it particularly easy to steadily remove the sanitary tissue paper 2 one sheet at a time. Furthermore, because the free, approximately trapezoidal edge piece 51A formed near the edge of the narrow portion 51 is wider and larger and a deep recess 6H is formed, the edge piece firmly rests against the highly rigid sanitary tissue paper 2 and supports the base portion 2R of the sanitary tissue paper 2, effectively preventing it from sagging. In addition, since the edge length of the curved convex portion 53 is longer, the sanitary thin paper 2 is gently rolled up along the edge of the curved convex portion 53, but since the sanitary thin paper 2 has high rigidity, it is less likely to break, and therefore has better uprightness.

[0037] Specifically, it is desirable that the length L3 of the curved convex portion 53 in the depth direction is 25 to 45 mm, and the bulging length L7 in the width direction is 2.5 to 12.5 mm.

[0038] On the other hand, specific examples of the flexible resin packaging film 4 that constitutes the exterior of the package 1 include polyethylene film, polypropylene film, polyester film, polyethylene terephthalate film, nylon film, vinylidene chloride film, and ethylene-vinyl alcohol copolymer monolayer film, as well as laminate films containing these films, and gas barrier films obtained by subjecting these films to surface treatments such as aluminum vapor deposition. Biomass films derived from plant materials such as sugarcane, potato (starch), and corn can also be used. The use of such biomass films is desirable from the perspective of environmental protection.

[0039] Polypropylene film and polyethylene film are particularly suitable. The packaging film 4 may also be a matte film, which has excellent design and feel. The melting point of the film is preferably 150°C or lower. The lower the melting point of the packaging film, the lower the temperature at which heat sealing can be performed, but the practical lower limit is 80°C. Examples of polypropylene films include unoriented polypropylene film (CPP), and examples of polyethylene films include linear low-density polyethylene film (LLDPE), low-density polyethylene film (LDPE), and medium-density polyethylene film (MDPE).

[0040] Furthermore, when packaging scented items such as scented tissue paper, ethylene-vinyl alcohol copolymer resin film or polyethylene terephthalate resin film, which have excellent aroma retention, is desirable. A multilayer resin film having enhanced heat-sealability 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 polyethylene terephthalate resin film may also be used.

[0041] Here, as shown particularly in FIGS. 5 and 6, the outlet forming section 5 according to the present invention is characterized in that the edge portion 50P of at least one end portion of the outlet forming section 5 in the width direction (the other end portion 5B in the illustrated example) is configured by an easily rupturable line 50 in which cut portions 50C and half-cut portions 50H are alternately arranged. In the shape of the outlet forming section 5 shown in FIGS. 1 to 5, particularly, 80% or more of the area constituting the edge of the curved convex portion 53 is the area 50P in which the cut portions 50C and half-cut portions 50H are alternately arranged. In this curved convex portion 53, preferably 90% or more, particularly preferably 95% or more, of the area is the area in which the cut portions 50C and half-cut portions 50H are alternately arranged. The entire area may be configured by an easily rupturable line in which the cut portions 50C and half-cut portions 50H are alternately arranged.

[0042] As shown in Fig. 6(a) as a plan view and Fig. 6(b) as a cross section thereof, the cut portion 50C is a portion that is completely cut in the thickness direction Z of the packaging film 4 from the front side 41, which is the surface that does not face the bundle 3, to the back side 42, which is the surface that faces the bundle 3, and the half-cut portion 50H is a portion that is not completely cut, but is cut to a predetermined depth range L8 in the thickness direction Z from the front side 41 to the back side 42. In this way, in a portion where the cut portions 50C and the half-cut portions 50H are arranged alternately, tearing proceeds more continuously and smoothly when the easy-to-tear line is torn, compared to a portion where the cut portions 50C and the uncut portions 50U, which have no cuts, are arranged alternately. This is because the difference in force required to tear the packaging film 4 is smaller between the cut section 50C and the half-cut section 50H than between the cut section 50C and the uncut section 50U, so the tearing tends to proceed continuously and smoothly from the cut section 50C to the half-cut section 50H and from the half-cut section 50H to the cut section 50C.

[0043] In particular, in the shape of the outlet forming portion 5 shown in Figures 1 to 5, it is desirable that the portion constituting the edge of the widened portion 52, which is continuous with the curved convex portion 53 having a portion where the cut portions 50C and the half-cut portions 50H are alternately arranged, also have a portion where the cut portions 50C and the half-cut portions 50H are alternately arranged. In particular, it is desirable that 80% or more of the portion constituting the edge of the widened portion 52 is a portion where the cut portions 50C and the half-cut portions 50H are alternately arranged. It is desirable that 90% or more, and particularly preferably 95% or more, is a portion where the cut portions 50C and the half-cut portions 50H are alternately arranged. The entire area may be formed as an easily rupturable line where the cut portions 50C and the half-cut portions 50H are alternately arranged.

[0044] Here, it is desirable that the half-cut portion 50H be cut to a depth of 20% or more of the thickness L9 of the packaging film. If the cut is 20% or more, a continuous, smooth tear can be generated sufficiently between the cut portion 50C and the half-cut portion 50H when forming the access opening by the opening operation. There is no upper limit to the depth of the cut, but if it is 80% or less, more preferably 60% or less, unintended tearing will be less likely to occur.

[0045] In the take-out opening forming portion 5 according to the present invention, the cut portions 50C and the half-cut portions 50H are alternately located at the widthwise end (the other end 5B in the illustrated example), which is the portion that is most likely to tear and be torn last in a typical opening operation in which the package is continuously pulled from one end 5A to the other end 5B within the range surrounded by the easy-to-tear line 50. Therefore, even when the opening operation is performed in which the package is continuously pulled from one end 5A to the other end 5B, there is little risk of the packaging film 4 tearing unintentionally at the other end 5B that is torn last. In particular, in the case of a generally gourd-shaped container having a narrow portion 51, a wide portion 52, and a curved convex portion 53 as shown in Figures 1 to 5, which is excellent in terms of the ease of drawing out high-rigidity paper towels and the like, and particularly in the case of a container having the above-mentioned preferred numerical ranges, the tear-open line forming the edge of the curved convex portion 53 is long and is arranged along the depth direction, so the angle between the pulling direction during opening and the tearing direction of the tear-open line is large, making the shape prone to tearing of the packaging film 4 during the opening operation. However, by providing a portion at the end where cut portions 50C and half-cut portions 50H are alternately arranged, the risk of tearing is significantly reduced. This is particularly effective in packaging forms such as pillow packaging and gusset packaging, where tearing is likely to occur because the stretching direction of the packaging film 4 is perpendicular to the longitudinal direction of the dispensing opening portion 5.

[0046] In addition, the alternately arranged cut portions 50C and half-cut portions 50H in the easy-to-tear line 50 forming the edge of the outlet-forming portion may be located at both ends of the outlet-forming portion 5, or may be located only at one end. If only one end is formed, the opposite end may be a continuous cut portion extending over a range L10 from the middle of the widened portion 52A on one side in the depth direction to a position beyond the outer end 53t of the curved convex portion 53A, as shown in FIG. 8(a). In this way, as shown in FIG. 8(b), a free piece 5T is formed at one end 5A of the outlet-forming portion 5 in a range from one depth side to the outer end, making it easier to pinch and turn up the free piece 5T, making the opening operation easier.

[0047] The ratio of the lengths of the cut portion 50C and the half-cut portion 50H at the end of the outlet-forming portion 5 is not necessarily limited, but the length of the cut portion 50C should be in the range of 5 mm to 20 mm, preferably 7 mm to 13 mm, and the length of the half-cut portion 50H should be in the range of 0.3 mm to 3 mm, preferably 0.7 mm to 1.3 mm. Within these ranges, smooth and continuous tearing occurs from the cut portion 50C to the half-cut portion 50H and from the half-cut portion 50H to the cut portion 50C, and unintended tearing is unlikely to occur.

[0048] Here, the thickness L9 of the packaging film 4 may be selected as appropriate, but is preferably 25 to 75 μm as measured in accordance with JIS P 8118 (1998). A thickness of 25 to 75 μm allows the effects of the present invention to be particularly effectively exhibited. The thickness L9 is measured using a dial thickness gauge (thickness measuring instrument) "PEACOCK G-1A Type" (manufactured by Ozaki Seisakusho Co., Ltd.) or an equivalent instrument after the measurement sample has been sufficiently conditioned under the conditions of JIS P 8111 (1998).

[0049] In the easily splittable wire 50 constituting the outlet forming section 5 according to the present invention, the portions other than the portion where the cut portions 50C and the half-cut portions 50H are alternately arranged can be perforated, slit cuts with uncut portions (non-cut portions), or the like. However, this is not limited thereto. The portion where the cut portions 50C and the half-cut portions 50H are alternately arranged may also be used.

[0050] As long as the perforations are used, the type is not limited. Examples include normal perforations in which the cut portion 50C is a straight line, microperforations in which the cut portion is a hole, and perforations in which the cut portion is Y-shaped, approximately L-shaped, or <-shaped. Normal perforations are preferred. A slit cut is a portion in which the film is cut into slits, but by including non-cut portions, the non-cut portions and cut portions are arranged alternately. Note that a slit cut having non-cut portions may also be simply referred to as a slit cut. While perforations and slit cuts having non-cut portions are sometimes not distinguished, in the present invention, a slit cut is referred to as a slit cut when the cut portions are less than two pitches apart, i.e., when there are no two consecutive cut portions of the same length. Generally, a slit cut is formed such that the cut portion is longer than the perforation.

[0051] 1 to 5, the shape having the narrow width portion 51, the wide width portion 52, and the curved convex portion 53 is such that the direction of extension of the edge of the narrow width portion 51 coincides with the pulling direction from one end 5A to the other end 5B during the opening operation, and therefore it is desirable to configure the edge of the narrow width portion 51 with perforations having uncut portions rather than half-cut portions. This is desirable because it makes the edge of the narrow width portion 51 less likely to tear open unintentionally.

[0052] The cut-tie ratio for slit cuts with perforations or non-cut sections is determined at an appropriate interval depending on the ease of tearing of the film used, but the length of the cut section should be designed appropriately from the range of 0.8 mm to 20.0 mm, and the length of the non-cut section (tie section or uncut section) should be designed appropriately from the range of 0.3 mm to 5.0 mm.

[0053] In addition, the easily splittable line 50 can be formed in one go by die cutting, for example, by slit cutting having perforations and non-cut portions, including the portions where cut portions 50C and half-cut portions 50H are arranged alternately. [Example]

[0054] Next, Examples 1 to 4 of the present invention and Comparative Examples 1 and 2 were prepared, and tests were conducted on the sagging of the sanitary tissue paper and the tearing of the opening access opening. The access opening forming portion of the packages according to Examples 1 to 4 and Comparative Example 1 has a roughly gourd-like shape with a narrow portion, a wide portion, and a curved convex portion as shown in Figures 1 to 5. The access opening forming portion of the package according to Comparative Example 2 is simply a linear perforation.

[0055] The bundle contained in the package in each example has a basis weight of 35.5 g / m 2 The packs consisted of 200 sets of single-ply paper towels (Elleair Refreshing Hand Towels, manufactured by Daio Paper Co., Ltd.) with a paper thickness of 255 μm, folded and stacked in a pop-up style. The packaging form in each example was gusset packaging, with the stretching direction of the packaging film perpendicular to the width direction of the take-out opening.

[0056] In the "number of times of dropping" test, the easy-to-tear line relating to the outlet forming portion was split open to form an outlet, and the paper towels making up the bundle were pulled out one by one from the outlet, right down to the last one, and the number of times that dropping actually occurred was counted.

[0057] For "openability," subjects were asked to open each sample by pinching one end and pulling it toward the other end, and the test was evaluated to see if a tear occurred at the other end of the opening. N=10, and cases where a tear occurred were rated as "yes," and cases where no tear occurred were rated as "no."

[0058] The dimensions of the outlet forming portion in each example, the ratio of the length of the top surface of the bundle in the depth direction and the length in the width direction, and the test results are shown in Table 1 below.

[0059] [Table 1]

[0060] As can be seen from Table 1, in Examples 1 to 4, in which the edge of the end (curved convex portion) is made up of alternating cut and half-cut portions, the maximum depthwise length of the outlet, i.e., the depthwise length of the curved convex portion which is the end, is 35 mm, which is long and covers 30% of the depthwise length of the top surface of the bundle, making it prone to tearing.However, no tearing was observed at the end of the outlet during the opening operation.

[0061] In Comparative Example 1, the cut portions of the curved convex portion in Example 1 were replaced with conventional non-cut portions instead of half-cut portions, but in this Comparative Example 1, tearing occurred at the edge of the outlet during the opening operation. Even in the case of an easily splittable line that forms the edge of a very long curved convex portion as in the Example, by arranging that portion alternately with cut portions and half-cut portions, it was shown that tearing at the edge of the outlet during the opening operation can be prevented.

[0062] Therefore, for example, in the case of other narrow outlet shapes that do not have widening sections as shown in Figure 7, it can be said that tearing of the end of the outlet during the opening operation can be better prevented by arranging the easy-to-tear lines that make up the edge of the end section as alternating cut sections and half-cut sections.

[0063] Furthermore, with regard to sagging, Comparative Example 2, in which the outlet forming portion is a single perforation and the outlet is a slit, experienced 12 sagging events. In contrast, Examples 1 to 4 and Comparative Example 1 experienced zero sagging events, meaning no sagging was observed. In other words, it was demonstrated that outlets with an outlet forming portion having a narrow portion, a wide portion, and a curved convex portion are particularly excellent in preventing sagging.

[0064] From the above, the packaging body of the present invention is a film-packaged packaging body that is easy to open, with the widthwise edges of the outlet not easily torn when opened, and that also has excellent pull-out properties for sanitary tissue paper, particularly hard sanitary tissue paper such as paper towels. [Explanation of symbols]

[0065] 1...packaging body, 2...sanitary tissue paper, 2A...folded inner side, 2B...folded piece, 2C...folded edge, 2R...root part of sanitary tissue paper exposed from removal opening, 3...stack of sanitary tissue paper, 3A...short side, 3B...long side, 3C...top and bottom surfaces of stack, 4...packaging film, 4A...short side, 4B...long side, 4C...top surface, 4D...bottom surface, 4X...overlapped part of packaging film, 5...removal opening forming part, 5A, 5B...longitudinal ends, 5T...free piece, 6...removal opening, 6E...edge of removal opening, 6H...recessed part of removal opening. 41...front side of packaging film, 42...back side of packaging film, 50...easy to split line, 50C...cut section, 50H...half cut section, 50U...non-cut section (tie section), 50P...section where cut sections and half cut sections are arranged alternately, 51...narrow section, 51A...approximately trapezoidal edge piece, 52...widened section, 53...curved convex section, ∠α...taper angle of widened section. L1...widthwise (longitudinal) length of the outlet forming section 5, L2...widthwise (longitudinal) length of the top surface of the bundle, L3...maximum depthwise (shortitudinal) length of the outlet forming section 5, L4...depthwise (shortitudinal) length of the top surface of the bundle, L5...widthwise (longitudinal) length of the narrow section, L6...depthwise (shortitudinal) length of the narrow section, L7...widthwise bulge length of the curved convex section, L8...depth of the half-cut section, L9...thickness of the packaging film, L10...range from the middle of the widened section on one side in the depth direction to a position beyond the outer end of the curved convex section. 105...take-out port forming section, 105A...one end of the take-out port forming section, 105B...other end of the take-out port forming section, 105P...tear in film, 150...perforation, 150e...perforation at widthwise end, X...longitudinal direction (width direction), Y...direction perpendicular to the longitudinal direction (depth direction), Z...thickness direction of packaging film.

Claims

1. A package in which a bundle of sanitary tissue paper is wrapped in a flexible resin wrapping film, An outlet forming portion is formed by arranging an easy-to-tear line in an annular shape on the upper surface, The outlet forming portion has a shape including a narrow portion extending in the width direction at a center portion in the depth direction, a wide portion continuing from an end of the narrow portion toward the outside in the width direction and gradually widening as it moves away from the narrow portion, and a curved convex portion continuing from the wide portion and bulging outward in the width direction, The edge of the narrow portion is made up of perforations in which cut portions and uncut portions are alternately arranged, 80% or more of the portion constituting the edge of the widened portion and 80% or more of the portion constituting the edge of the curved convex portion are portions in which the cut portions and the half-cut portions are alternately arranged. A package characterized by:

2. 2. The package according to claim 1, wherein the half-cut portion is cut to a depth of 20% or more of the thickness of the packaging film.

3. 3. The package according to claim 1, wherein the length of the curved convex portion in the depth direction is 25 to 45 mm and the bulging length in the width direction is 2.5 to 12.5 mm.

4. The package according to any one of claims 1 to 3, wherein the widthwise length of the outlet forming portion is 70% or more of the widthwise length of the top surface of the stack, the maximum depthwise length is 10 to 40% of the depthwise length of the top surface of the stack, the widthwise length of the narrow portion is 50 to 70% of the widthwise length of the top surface of the stack, and the depthwise length is 0.5 to 10% of the depthwise length of the top surface of the stack.

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