Package for paper product

Abstract

To provide a package for paper product which is easy to hold and in which a paper product can be easily taken out and perforations of a taking-out port of the package can be easily opened even when the paper product having high specific volume is an article to be packaged.SOLUTION: A film packaging base material has four mountain fold parts approximately parallel to one another extending in one direction. Seal parts are formed at both end parts of the mountain fold parts so as to be approximately straight lines orthogonal to a direction of the mountain fold parts while each of seal parts is approximately parallel to each other. A basis weight of the film packaging base material is 20 g / m2 or more and 110 g / m2 or less. A ratio of a volume of a laminate to a capacity for containing the laminate in the packaging base material (a package filling rate) is 70% or more and 160% or less. In the laminate, 70 pairs or more and 270 pairs or less of two-or-more-ply paper products are laminated. In perforations, a bond ratio is 5% or more and 60% or less, a ratio defined by ((length of the perforations / long side length of paper product laminate)×100(%)) is 40% or more and 90% or less. A tensile strength is 500 gf or more and 4500 gf or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a package suitable for packaging paper products, particularly thin paper such as tissue paper not coated with lotion.

Background Art

[0002] Conventionally, packages for accommodating roll-shaped paper products such as toilet paper and kitchen paper, and laminated paper products such as tissue paper and wipes as objects to be packaged are known.

[0003] As a package for packaging roll-shaped paper products, for example, Patent Document 1 discloses a package in which a gusset is symmetrically folded into a cylindrical film such as polyethylene to form a main body, and the upper part thereof is folded flat to form a gripping part.

[0004] On the other hand, as a package for packaging laminated paper products, a paper carton made of cardboard with a high basis weight is generally used.

[0005] Further, as a package alternative to a paper carton, for example, Patent Document 2 discloses a film package in which a perforation is provided at the center of the upper surface of a packaging bag formed of a flexible resin film.

[0006] However, when the package is a resin film, although it has flexibility, generally, it is likely to lose its shape, and the situation when packaging, sealing, transporting, and using the paper product as the object to be packaged, particularly the external load, tends to affect the state of the paper product in the package.

[0007] For example, if the resin film is thickened to maintain the packaging form, it becomes difficult to make a perforation, and it is necessary to apply a strong force to open and use it. Then, the packaging base material is torn or deformed due to elongation, and the shape of the package is greatly distorted. As a result, the paper product as the object to be packaged also becomes deformed, and it may be difficult to take it out when taking it out from the package for use and may not be suitable for use.

[0008] In addition, when the paper product is soft and not lotion-coated, the specific volume of the paper product is higher and fluffier than that of the lotion-coated one. Therefore, it is necessary to appropriately set the volume of the package in consideration of the volume of the paper product occupying the package. If the volume of the paper product occupying the package is too large, it becomes difficult to take out the paper product, and the package also deforms, making it difficult to hold. Conversely, if the volume of the paper product is too small, it is difficult to take out the paper product unless a finger is inserted into the package, and there is also a problem that it is difficult to firmly hold the package.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] The present invention has been made in view of such circumstances, and even when a paper product, particularly a paper product with a high specific volume that is not lotion-coated such as tissue paper, is used as an object to be packaged, it is easy to take out the paper product, the package is easy to hold, and the perforation at the take-out opening of the package is easy to open. The purpose is to provide a package for paper products.

Means for Solving the Problems

[0011] The inventor has conducted intensive studies and found that in a packaging body for paper products, which has a film packaging substrate with four substantially parallel mountain-fold portions extending in one direction, the laminate of paper products not coated with lotion is covered, and the laminate is sealed by a seal portion. Each mountain-fold portion has a ruled line, and the seal portions are formed as substantially straight lines orthogonal to the direction of the mountain-fold portions at both ends of the mountain-fold portions, and each seal portion is formed substantially parallel to each other. The packaging form using the film packaging substrate is a gusset packaging. By defining the basis weight of the film packaging substrate, the packaging body filling rate, the number of paper product sets in the laminate, the specific volume of the paper products, and the dimensions and physical property values of the perforations provided in the packaging body, the above problems can be solved, and the present invention has been completed. That is, the present invention provides the following.

[0012] (1) The first aspect of the present invention is a packaging body for paper products, which has a film packaging substrate with four substantially parallel mountain-fold portions extending in one direction, the laminate of paper products not coated with lotion is covered, and the laminate is sealed by a seal portion. Each mountain-fold portion has a ruled line, and the seal portions are formed as substantially straight lines orthogonal to the direction of the mountain-fold portions at both ends of the mountain-fold portions, and each seal portion is formed substantially parallel to each other. The packaging form using the film packaging substrate is a gusset packaging. The basis weight of the film packaging substrate is 20 g / m 2 or more and 110 g / m 2 or less. The ratio of the volume of the laminate to the volume of the container for accommodating the laminate in the packaging substrate (packaging body filling rate) is 70% or more and 160% or less. The laminate is formed by laminating 2 plies or more of the paper products in a number of 70 sets or more and 270 sets or less. The paper products have a specific volume of 4.0 cm 3 / g or more and 9.0 cm 3 / g or less. At least one or more linear perforation extraction openings parallel to the mountain-fold portions are formed on the top surface of the packaging body. The perforations have a bonding rate of 5% or more and 60% or less, a ratio defined by ((perforation length ÷ long side length of the paper product laminate) × 100 (%)) of 40% or more and 90% or less, and a tensile strength of 500 gf or more and 4500 gf or less. It is a packaging body for paper products, characterized by the above.

[0013] (2) The second aspect of the present invention is the package for paper products described in (1), characterized in that the longitudinal tear strength of the film packaging base material is 3 N or more and 19 N or less.

[0014] (3) The third aspect of the present invention is the package for paper products described in (1), characterized in that the transverse tear strength of the film packaging base material is 5 N or more and 27 N or less.

[0015] (4) The fourth aspect of the present invention is the package for paper products described in (1), characterized in that the longitudinal tensile strength of the film packaging base material is 7 N or more and 39 N or less.

[0016] (5) The fifth aspect of the present invention is the package for paper products described in (1), characterized in that the transverse tensile strength of the film packaging base material is 5 N or more and 30 N or less.

[0017] (6) The sixth aspect of the present invention is the package for paper products described in (1), characterized in that the thickness of the film packaging base material is 20 μm or more and 120 μm or less.

[0018] (7) The seventh aspect of the present invention is the package for paper products described in (1), characterized in that the paper thickness per 10 sheets of the paper product is 0.60 mm / 10 sheets or more and 1.2 mm / 10 sheets or less.

Advantages of the Invention

[0019] According to the present invention, even when a paper product, particularly a paper product with a high specific volume that has not been lotion-coated such as tissue paper, is used as the object to be packaged, a package for paper products can be provided that makes it easy to take out the paper product, easy to hold the package, and easy to open the perforation at the take-out opening of the package.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0021] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. These are presented for illustrative purposes and do not limit the present invention.

[0022] In this specification, the flow direction and the width direction respectively mean the manufacturing line direction (also referred to as the conveyance direction or MD direction) and the direction orthogonal to the manufacturing line direction (also referred to as the CD direction) during the manufacture of the package for paper products. Further, the height direction means a direction orthogonal to both the flow direction and the width direction.

[0023] <Package for Paper Products> FIGS. 1 and 2 are perspective views showing an example of the package for paper products (hereinafter also simply referred to as "package") 1 of the present invention and the process of taking out the paper product 21 from the package 1. The package 1 of the present invention is covered with a film packaging base material (hereinafter also simply referred to as "packaging base material") 10 and a paper product laminate (hereinafter also simply referred to as "laminate") 11 in which the paper product 21 not coated with lotion is laminated, and the laminate 11 is sealed by a seal portion 13. The seal portion 13 is preferably provided at the overlapping end of the packaging base material 10. Further, the package 1 is provided with a take-out opening 15 for taking out the paper product 21. This take-out opening 15 is provided by forming a perforation cut line 14 in the packaging base material 10 so that the cut line can be cut and opened during use. The shape of the cut line is preferably a single perforation line.

[0024] (Sealing part) The sealing part 13 is preferably formed in a substantially straight line at a position about 10 mm from each end of the package 1, and the sealing parts 13 are substantially parallel to each other. However, as long as the sealing property of the package 1 (adhesiveness of the sealing part 13) can be ensured, it may be formed at other positions. When sealing with the sealing part 13, it is desirable to seal by heat sealing. Also, it is not necessary to heat-seal the entire sealing part 13, and a part may not be heat-sealed.

[0025] (Valley fold part) The valley fold part 12 extends in four substantially parallel directions, all having ruled lines, and creases are made along the ruled lines. The length of each ruled line may be a part of the valley fold part 12, preferably 40% or more, more preferably 60% or more, and still more preferably 80% or more. Since the valley fold part 12 has ruled lines, the handleability of the package is improved. In the package 1, in FIG. 1, the packaging base material 10 covers the entire laminate 11, but it may cover only a part instead of the whole (not shown).

[0026] (Take-out opening) The package 1 is provided with a take-out opening 15 for taking out the paper product 21. This take-out opening 15 has a single-stitch perforation 14 for forming the take-out opening 15 in the packaging base material 10, and is formed by cutting the perforation 14 and opening it during use. As shown in FIG. 2, by sequentially pulling out (taking out) the paper product 21 from the formed take-out opening 15, the required number of sheets of the paper product 21 can be obtained. The perforation 14 is preferably provided on the surface (top surface) of the packaging base material 10 that covers the upper part of the paper product 21 so as to be substantially parallel to one side of the paper product 21. Also, it is preferably provided so as to be disposed above the central part of the paper product 21.

[0027] (Packaging form) The packaging form of the package 1 is gusset packaging. As shown in Fig. 5, gusset packaging is formed into a cylindrical shape in which both ends of the bottom or mouth part corresponding to the length (height) of the bag are woven inside as gusset parts 12, and the laminate 11 is inserted from the insertion port 16 inside the packaging base material 10 sealed at one side by a seal part 13 and sealed in a horizontal row by heat sealing or the like, and is a packaging form cut into individual bags at this sealed part. This gusset packaging can be carried out using known devices. Also, the laminate 11 may be inserted in a state where the packaging base material 10 at the part of the insertion port 16 is inverted to the outside so as not to be rolled inside.

[0028] <Film packaging base material> The film packaging base material 10 preferably contains at least a film base material, preferably does not contain paper, and preferably has printing on the film packaging base material 10. Note that the basis weight value described later includes the ink for printing. The film packaging base material 10 preferably contains 90% by weight or more of the film, and more preferably 95% by weight or more.

[0029] (Tube-shaped film) The film packaging base material 10 is preferably tube-shaped (that is, when the packaging base material 10 contains only the film base material, it is a tube-shaped film). A tube-shaped film is a film formed by shaping a sheet-like film into a cylindrical shape like a tube.

[0030] (Material of the film) The film (hereinafter also referred to as "film substrate") constituting the film packaging substrate 10 may be formed as a single layer or as a multi-layer. The material of the film can be used without particular limitation as a plastic (thermoplastic resin) film used when packaging ordinary paper products, and surface treatment may also be performed. From the viewpoints of beauty and anti-slip properties, in particular, a matte film is preferable. As the material of the plastic film, conventionally known thermoplastic resins such as polyolefin (such as polyethylene and polypropylene), polyester (such as PET), polyamide (such as nylon), polycarbonate, polystyrene, polyvinyl chloride, etc. can be mentioned, and polyethylene is preferably used.

[0031] Specifically, when the film substrate is formed as a single layer, it is preferable that the material of the film is any one selected from matte polyethylene, milky white polyethylene, linear low-density polyethylene, and unstretched polypropylene. When the film substrate is formed as a multi-layer, specifically, it is preferable that the material of the film on the outermost layer of the film substrate is any one selected from matte polyethylene, milky white polyethylene, linear low-density polyethylene, and unstretched polypropylene. Also, it is preferable that the material of the film on the innermost layer is any one selected from these four types of materials, and the materials of the film on the outermost layer and the innermost layer may be the same or different. Note that the number of layers does not include the ink layer. More preferably, the outermost layer is matte polyethylene and the innermost layer is milky white polyethylene. When the outermost layer is matte polyethylene, it can be firmly held without slipping, making it easy to take out the paper product 21 (easy to use). Also, when the innermost layer is milky white polyethylene, the friction with the paper product 21 is small, making it easy to take out the paper product 21 from the package 1.

[0032] In the case of the embossed polyethylene film which is the outermost layer of the tubular film, the method of embossing the film is not particularly limited, and known methods can be adopted, such as a method of pressing the surface of the tubular film against an embossing roll or a matte roll to impart unevenness, or a method of imparting unevenness by a sandblasting method. These methods may be carried out at the time of forming the tubular film, but it is preferable to carry out the method on single-layer polyethylene to obtain an embossed polyethylene film, and then laminate it with the innermost milky white polyethylene film or the like. Further, without performing surface treatment as described above, for example, a method using a polymer blend or a method of biaxially stretching a laminate of a polyolefin resin blend can also be adopted. Further, it is preferable that the tubular film is made into a multilayer film by extrusion laminating the outermost embossed film and the innermost milky white film using polyethylene.

[0033] Further, the film packaging base material 10 of the present invention may include other layers in addition to the film base material. Examples of other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improving layer, an overprint layer, a light shielding layer, and the like. These other layers can be provided, for example, on the surface in contact with the paper product 21 or on the surface in contact with the outside air, and may be one layer or two or more layers. Note that the number of layers does not include the ink layer. The printing layer is preferably provided between the outermost film and the innermost milky white film. By doing so, it becomes easier to package the paper product laminate 11 while maintaining a good touch of the film.

[0034] (Basis weight of the film packaging base material) The basis weight of the film packaging base material 10 is 20 g / m 2 or more and 110 g / m 2 or less. If the basis weight is less than 20 g / m 2 , the strength of the film packaging base material 10 is weak, and the package 1 is likely to bend at parts other than the ruled lines and the form is not stable, making it difficult to take out the paper product 21. If the basis weight is 110 g / m 2When it exceeds this range, the strength of the film packaging base material 10 is too high, making it difficult for the packaging body 1 to bend at the ruled line part, resulting in unstable form and difficulty in taking out the paper product 21. When the basis weight of the film packaging base material 10 is within the above range, when the laminate 11 decreases, the packaging body 1 is easily recessed accordingly, and it is easy to take out the paper product 21 even when the laminate 11 decreases, and a packaging body 1 that is easy to use can be obtained.

[0035] The lower limit value of the basis weight of the film packaging base material 10 is preferably 30 g / m 2 or more, more preferably 40 g / m 2 or more. On the other hand, the upper limit value is preferably 90 g / m 2 or less, more preferably 75 g / m 2 or less. The basis weight of the film packaging base material 10 can be measured in accordance with JIS P 8124.

[0036] (Thickness of the film packaging base material) The lower limit value of the thickness of the film packaging base material 10 is preferably 20 μm or more, more preferably 30 μm or more, and even more preferably 40 μm or more. The upper limit value is preferably 120 μm or less, more preferably 100 μm or less, and even more preferably 90 μm or less. When the thickness of the film packaging base material 10 is less than 20 μm, it is difficult to open the perforation 14 because the film breaks at places other than the perforation 14. When the thickness of the film packaging base material 10 exceeds 120 μm, it is difficult to open the perforation 14. The thickness of the film packaging base material 10 can be measured in accordance with JIS K7130.

[0037] (Height (A) of the packaging body) As shown in Fig. 1, when the distance between the mountain-fold portions 12 in the direction orthogonal to the linear direction of the seal portion 13 at the center of the mountain-fold portion 12 in the package 1 is defined as the height (A) of the package (hereinafter, also simply referred to as "(A)"), the lower limit value of (A) is preferably 15 mm or more, more preferably 22 mm or more, and still more preferably 30 mm or more. The upper limit value of (A) is preferably 100 mm or less, more preferably 90 mm or less, and still more preferably 80 mm or less. When the height (A) of the package 1 is less than 15 mm, it is difficult to firmly hold the package 1 with force, and when it exceeds 100 mm, it is difficult to hold the package 1 by hand.

[0038] For the height (A) of the package 1, place the package 1 on a horizontal table, place a 15 cm ruler (Shinwa Measuring Straight Ruler, Stainless Steel, 15 cm, Red Numerals, JIS, 10 g) parallel to the width direction at the center in the flow direction on the package 1, stand it vertically on the horizontal table so that the ruler is orthogonal to the 15 cm ruler (Shinwa Measuring Straight Ruler, Stainless Steel, 15 cm, Red Numerals, JIS, 10 g), measure at two places, and take the average as the measured value.

[0039] (Short side length (B) of the package) As shown in Fig. 1, when the distance between the mountain-fold portions 12 in the direction parallel to the linear direction of the seal portion 13 at the center of the mountain-fold portion 12 in the package 1 is defined as the short side length (B) of the package (hereinafter, also simply referred to as "(B)"), the lower limit value of (B) is preferably 80 mm or more, more preferably 90 mm or more, and still more preferably 100 mm or more. The upper limit value of (B) is preferably 150 mm or less, more preferably 140 mm or less, and still more preferably 130 mm or less. When the short side length (B) of the package 1 is less than 80 mm, the non-sealed portion (hole for air to escape) in the seal portion 13 described later becomes small, and it cannot be tightly packaged, so it is difficult to hold the package. When (B) exceeds 150 mm, the seal portion 13 is not properly sealed, so it is difficult to hold the package 1.

[0040] The short side length (B) of the package 1 is measured by placing the package 1 on a horizontal table and using a ruler (Shinwa Measuring Straight Ruler, stainless steel, 15 cm, red numbers, JIS, 10 g) to measure three locations at the center of the package 1 and at positions 2 cm away from the center. The average of these measurements is taken as the measured value.

[0041] (Length of the long side of the package (C)) As shown in Fig. 1, when the distance from one sealing part 13 to the other sealing part 13 in the package 1 (excluding the sealing part) is defined as the length of the long side of the package (C) (hereinafter, also simply referred to as "(C)"), the lower limit value of (C) is preferably 140 mm or more, more preferably 160 mm or more, and even more preferably 180 mm or more. The upper limit value of (C) is preferably 300 mm or less, more preferably 280 mm or less, and even more preferably 250 mm or less. If the length of the long side (C) of the package 1 is less than 140 mm, it may not be possible to wrap the clip (laminated body 11) during packaging, and it is difficult to take out the paper product 21. If (C) exceeds 300 mm, the tightness of the package 1 cannot be maintained, so it is difficult to hold the package.

[0042] As shown in Fig. 3, the length of the long side (C) of the package 1 is measured by taking out the laminated body 11 from the packaging substrate 10 and folding the mountain-folded parts 12 of the top surface and the bottom surface together, and using a ruler (Shinwa Measuring Straight Ruler, stainless steel, 30 cm, red numbers, JIS, 70 g).

[0043] (Longitudinal tear strength) The lower limit value of the tear strength in the longitudinal direction (MD direction) of the packaging substrate 10 is preferably 3 N or more, more preferably 5 N or more, and even more preferably 8 N or more. The upper limit value is preferably 19 N or less, more preferably 16 N or less, and even more preferably 13 N or less. If the longitudinal tear strength is less than 3 N, the packaging substrate 10 is likely to tear at places other than the perforation 14 when the perforation 14 is opened, making it difficult to open. If the longitudinal tear strength exceeds 19 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened.

[0044] (Transverse tear strength) The lower limit of the tear strength of the packaging substrate 10 in the lateral direction (CD direction) is preferably 5 N or more, more preferably 7 N or more, and still more preferably 12 N or more. The upper limit is preferably 27 N or less, more preferably 22 N or less, and still more preferably 18 N or less. If the lateral tear strength is less than 5 N, the packaging substrate 10 is likely to be torn at locations other than the perforation 14 when the perforation 14 is opened, making it difficult to open. If the lateral tear strength exceeds 27 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened.

[0045] The tear strength of the packaging substrate 10 in the longitudinal and lateral directions is measured in accordance with JIS K 7128-1, and the width of the test piece is 10 mm.

[0046] (Tensile strength in the longitudinal direction) The lower limit of the tensile strength of the packaging substrate 10 in the longitudinal direction (MD direction) is preferably 7 N or more, more preferably 10 N or more, and still more preferably 18 N or more. The upper limit is preferably 39 N or less, more preferably 32 N or less, and still more preferably 26 N or less. If the longitudinal tensile strength is less than 7 N, the packaging substrate 10 is likely to be torn at locations other than the perforation 14 when the perforation 14 is opened, making it difficult to open. If the longitudinal tensile strength exceeds 39 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened.

[0047] (Tensile strength in the lateral direction) The lower limit of the tensile strength of the packaging substrate 10 in the lateral direction (CD direction) is preferably 5 N or more, more preferably 8 N or more, and still more preferably 14 N or more. The upper limit is preferably 30 N or less, more preferably 25 N or less, and still more preferably 20 N or less. If the lateral tensile strength is less than 5 N, the packaging substrate 10 is likely to be torn at locations other than the perforation 14 when the perforation 14 is opened, making it difficult to open. If the lateral tensile strength exceeds 30 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened.

[0048] The tensile strength of the packaging substrate 10 in the longitudinal and lateral directions is measured in accordance with JIS K 7127, and the width of the test piece is 10 mm.

[0049] (Perforation of the package) The perforation line 14 formed on the packaging base material 10 of the package 1 is provided on the surface covering the upper part of the laminate 11 so as to be substantially parallel to one side of the paper product 21. Further, the perforation line 14 is preferably provided so as to be disposed above the central portion of the laminate 11, and the length direction of the single-line perforation line 14 is preferably a direction parallel to the long side direction (MD direction) of the packaging base material 10.

[0050] (Shape of the perforation line) The shape of the perforation line 14 is substantially linear. If it is not substantially linear, when opening the perforation line 14, force is not evenly applied to the perforation line 14, making it difficult to open the perforation line 14.

[0051] (Length of the perforation line) The lower limit of the overall length of the perforation line 14 is preferably 40 mm or more, more preferably 50 mm or more, and still more preferably 60 mm or more. The upper limit is preferably 180 mm or less, more preferably 160 mm or less, and still more preferably 140 mm or less. If the length of the perforation line 14 is less than 40 mm, the perforation line is too short, making it difficult to open the perforation line 14. If it exceeds 180 mm, the perforation line is too long, making it difficult to open the perforation line 14. The length of the perforation line 14 is measured with a ruler (Shinwa Measuring Co., Ltd. straight ruler, stainless steel, 15 cm, red numerals, JIS, 10 g).

[0052] (Length of the connecting part of the perforation line) The length of the connecting part of the perforation line 14 preferably has a lower limit of 0.2 mm or more, more preferably 0.3 mm or more, and still more preferably 0.5 mm or more. On the other hand, the upper limit is preferably 3.0 mm or less, more preferably 2.0 mm or less, and still more preferably 1.0 mm or less. If the length of the connecting part of the perforation line 14 is less than 0.2 mm, when opening the perforation line 14, the packaging base material 10 is likely to break to other parts than the perforation line 14, making it difficult to open the perforation line 14. If the length of the connecting part of the perforation line 14 exceeds 3.0 mm, it becomes difficult to open the perforation line 14. The length of the connecting part of the perforation line 14 is measured with a microscope.

[0053] (Length of the cutting line of the perforation line) The length of the cut line of the stitch 14 is preferably 0.5 mm or more, more preferably 0.7 mm or more, and still more preferably 1.0 mm or more. The upper limit value is preferably 4.5 mm or less, more preferably 3.5 mm or less, and still more preferably 2.5 mm or less. If the length of the cut line of the stitch 14 is less than 0.5 mm, it becomes difficult to open the stitch 14. If the length of the cut line of the stitch 14 exceeds 4.5 mm, the film is likely to break up to a place other than the stitch 14 when the stitch 14 is opened, making it difficult to open the stitch 14. Incidentally, the length of the cut line of the stitch 14 is measured with a microscope.

[0054] (Bonding ratio of the stitch) The bonding ratio of the stitch 14 (the ratio of the connecting part of the stitch 14) is 5% or more and 60% or less. If the bonding ratio is less than 5%, the end of the stitch 14 will tear, making it difficult to open the stitch 14. If the bonding ratio exceeds 60%, it becomes difficult to open the stitch 14. The lower limit value of the bonding ratio is preferably 10% or more, more preferably 20% or more. The upper limit value is preferably 45% or less, more preferably 35% or less.

[0055] (Ratio of the stitch) The ratio defined by ((the length of the stitch 14 ÷ the long side length (F) of the laminate 11) × 100 (%)) of the stitch 14 is 40% or more and 90% or less. If the ratio of the stitch is less than 40%, when the paper product 21 is taken out from the take-out port 15, the paper product 21 is caught on the end of the take-out port 15 and torn, making it difficult to take out. If the ratio exceeds 90%, the take-out port 15 opens too much and the paper product 21 drops back, making it difficult to take out. The lower limit value of the ratio of the stitch is preferably 50% or more, more preferably 60% or more. The upper limit value is preferably 85% or less, more preferably 80% or less.

[0056] (Tensile strength of the stitch part) The tensile strength of the perforation 14 formed in the packaging substrate 10 is 500 gf or more and 4500 gf or less. If the tensile strength is less than 500 gf, the end of the perforation 14 will tear when opening the perforation 14, making it difficult to open the perforation 14. If the tensile strength exceeds 4500 gf, it will be difficult to open the perforation 14. The lower limit value of the tensile strength of the perforation 14 is preferably 1000 gf or more, more preferably 2000 gf or more. The upper limit value is preferably 4000 gf or less, more preferably 3000 gf or less. The tensile strength of the perforation 14 is measured in accordance with JIS P 8113, and the tensile speed is 300 mm / min.

[0057] <Paper products and paper product laminates> FIG. 4 is a perspective view showing an example of the paper product laminate 11 packaged in the package 1. Hereinafter, the paper product 21 and the paper product laminate 11 will be described in detail.

[0058] (Paper product) The paper product 21 laminated on the laminate 11 is a soft tissue or the like using uncoated tissue paper. By not applying lotion, the paper product 21 is soft and has a fluffy texture. Also, the paper product 21 is 2-ply or more, preferably 2-ply or more and 3-ply or less, and more preferably 2-ply.

[0059] (Basis weight of paper product) The lower limit value of the basis weight per ply of the paper product 21 is preferably 7 g / m 2 or more, more preferably 10 g / m 2 or more, and even more preferably 13 g / m 2 or more. The upper limit value is preferably 23 g / m 2 or less, more preferably 20 g / m 2 or less, and even more preferably 17 g / m 2 or less. If the basis weight is less than 7 g / m 2 the upper and lower parts of the laminate 11 are likely to curl, making it difficult to take out the paper product 21. If the basis weight is 23 g / m 2When it exceeds this value, the softness as a tissue deteriorates and the friction when taking out the paper product 21 increases, making it difficult to take out the paper product 21. The basis weight per ply of the paper product 21 is measured in accordance with JIS P 8124.

[0060] (Paper thickness of the paper product) The lower limit value of the paper thickness per 10 sheets of the paper product 21 is preferably 0.60 mm / 10 sheets or more, more preferably 0.70 mm / 10 sheets or more, and still more preferably 0.80 mm / 10 sheets or more. The upper limit value is preferably 1.20 mm / 10 sheets or less, more preferably 1.10 mm / 10 sheets or less, and still more preferably 1.00 mm / 10 sheets or less. When the paper thickness per 10 sheets is less than 0.60 mm / 10 sheets, the upper and lower parts of the laminate 11 are likely to curl, making it difficult to take out the paper product 21. When the paper thickness per 10 sheets exceeds 1.20 mm / 10 sheets, the friction when taking out the paper product 21 increases, making it difficult to take out the paper product 21.

[0061] Note that the paper thickness per 10 sheets of the paper product 21 is measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a measuring head diameter of 30 mm. A sample is placed between the measuring head and the measuring table, and the gauge is read when the measuring head is lowered at a speed of 1 mm or less per second. When the paper product 21 is 2 plies, five sets of 2-ply paper products 21 are stacked and measured as 10 sheets, and the measured value is calculated as the paper thickness per 10 sheets. Also, the measurement is repeated 10 times (not measuring the same place 10 times, but measuring 10 different places), and the average of the measurement results is taken as the final paper thickness.

[0062] (Specific volume of the paper product) The specific volume of the paper product 21 is 4 cm 3 / g or more and 9 cm 3 / g or less. When the specific volume is less than 4 cm 3 / g, it is difficult to take out the paper product 21 without putting a finger inside the package 1, and it is difficult to hold the package 1 firmly. When the specific volume is 9 cm 3If it exceeds / g, it becomes difficult to take out the paper product 21, and the package 1 is deformed, making it difficult to carry. The lower limit value of the specific volume of the paper product 21 is 5 cm 3 / g or more is preferable, and 6 cm 3 / g or more is more preferable. The upper limit value is 8 cm 3 / g or less is preferable, and 7 cm 3 / g or less is more preferable. The specific volume of the paper product 21 is obtained by dividing the paper thickness of the paper product 21 by the basis weight, and is expressed in cm 3 per unit g of volume.

[0063] (Number of sets of paper products) When the paper product 21 is 2-ply, the number of sets of the paper products 21 laminated on the paper product laminate 11 is 70 sets or more and 270 sets or less. If the number of sets is less than 70 sets, the upper space in the package 1 becomes too empty, and it becomes necessary to put a finger into the inside of the package 1, making it difficult to take out the paper product 21. If the number of sets exceeds 270 sets, the upper space in the package 1 is too small, so the paper product 21 may get caught at the take-out port 15 and be torn, making it difficult to take out the paper product 21. The lower limit value of the number of sets of the paper product 21 is preferably 80 sets or more, and more preferably 180 sets or more. The upper limit value is preferably 260 sets or less, and more preferably 210 sets or less.

[0064] (Height (D) of the laminate) As shown in FIG. 5, when the dimension corresponding to the height (A) of the package when the paper product laminate 11 is accommodated in the package 1 is defined as the height (D) of the laminate (hereinafter, also simply referred to as "(D)"), the lower limit value of (D) is preferably 15 mm or more, more preferably 22 mm or more, and still more preferably 30 mm or more. The upper limit value of (D) is preferably 140 mm or less, more preferably 120 mm or less, and still more preferably 100 mm or less. If the height (D) of the laminate is less than 15 mm, when inserting the clip (laminate 11) into the packaging base material 10, it is compressed and the paper product 21 is warped, making it difficult to take out the paper product 21. If the height D of the laminate 11 exceeds 140 mm, it is necessary to crush the clip (laminate 11) when packaging with the packaging base material 10, and the paper product 21 will have wrinkles and creases, making it difficult to take out the paper product 21.

[0065] The height (D) of the laminate 11 is measured by placing the laminate 11 on a horizontal base, placing a 15 cm ruler (Shinwa Measuring Straight Ruler, stainless steel, 15 cm, red numerals, JIS, 10 g) parallel to the short side direction (width direction) at the center in the long side direction (flow direction) on the laminate 11, measuring at two locations vertically on the horizontal base so that the ruler is perpendicular to the 15 cm ruler (Shinwa Measuring Straight Ruler, stainless steel, 15 cm, red numerals, JIS, 10 g), and taking the average as the measured value.

[0066] (Short side length (E) of the laminate) As shown in FIG. 5, when defining the dimension corresponding to the short side length (B) of the package when the laminate 11 is accommodated in the package 1 as the short side length (E) of the laminate (hereinafter, also simply referred to as "(E)"), the lower limit value of (E) is preferably 80 mm or more, more preferably 90 mm or more, and still more preferably 100 mm or more. The upper limit value of (E) is preferably 150 mm or less, more preferably 140 mm or less, and still more preferably 130 mm or less. If the short side length (E) of the laminate is less than 80 mm, the non-sealed portion (hole for air escape) in the seal portion 13 becomes small and it cannot be tightly packaged, so the package is difficult to hold. If (E) exceeds 150 mm, the seal portion 13 is not properly sealed, so the package 1 is difficult to hold.

[0067] The short side length (E) of the laminate 11 is measured by placing the laminate 11 on a horizontal base, placing a 15 cm ruler (Shinwa Measuring Straight Ruler, stainless steel, 15 cm, red numerals, JIS, 10 g) parallel to the short side direction (width direction) at the center in the long side direction (flow direction) on the laminate 11 and measuring at two locations, and taking the average as the measured value.

[0068] (Long side length (F) of the laminate) As shown in Fig. 5, when defining the dimension corresponding to the long side direction (MD direction) of the package when the laminate 11 is housed in the package 1 as the long side length (F) of the laminate (hereinafter, also simply referred to as "(F)"), the lower limit value of (F) is preferably 90 mm or more, more preferably 110 mm or more, and still more preferably 130 mm or more. The upper limit value of (F) is preferably 220 mm or less, more preferably 200 mm or less, and still more preferably 180 mm or less. If the long side length (F) of the laminate is less than 90 mm, the tightness of the package 1 cannot be maintained, so the package 1 is difficult to hold. If (F) exceeds 220 mm, the clip (laminate 11) may be involved and cannot be packaged, so the package 1 is difficult to hold.

[0069] The long side length (F) of the laminate 11 is measured by placing the laminate 11 on a horizontal table, placing a ruler (Shinwa Measuring Ruler, Stainless Steel 30 cm, Red Numerals, JIS, 70 g) parallel to the long side direction (flow direction) at the center of the short side direction (width direction) of the laminate 11 and measuring at two places, and taking the average as the measured value.

[0070] (Package filling rate) The package filling rate is calculated by the ratio of the volume of the laminate 11 (height D of the laminate × short side length E of the laminate × long side length F of the laminate) to the volume of the package 1 for housing the laminate 11 (height A of the package × short side length B of the package × long side length C of the package). Package filling rate = (D × E × F) / (A × B × C) × 100

[0071] The package filling rate is 70% or more and 160% or less. If the package filling rate is less than 70%, the laminate 11 of the paper product 21 is too small with respect to the volume of the package 1, so it is difficult to take out the paper product 21 without putting a finger into the package 1, and the package 1 cannot be held firmly. If the package filling rate exceeds 160%, the laminate 11 of the paper product 21 is too large with respect to the volume of the package 1, so the packaging base material 10 is torn, it is difficult to take out the paper product 21, and the shape of the package 1 is deformed, so the package 1 is difficult to hold. The lower limit value of the package filling rate is preferably 80% or more, more preferably 90% or more. The upper limit value is preferably 150% or less, more preferably 140% or less.

[0072] Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Also, it is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Example

[0073] Hereinafter, the present invention will be described in detail with reference to examples. Note that the present invention is not limited to the examples shown below.

[0074] (Packaging substrate) As an example of the embodiment, in Example 3, a film having a three-layer structure (the outermost layer is embossed polyethylene, the middle layer is polyethylene (extrusion laminate), and the innermost layer is milky white polyethylene) was prepared as the packaging substrate and used as it is as the packaging substrate. Table 1 shows the results of measuring the basis weight, longitudinal and transverse tear strengths, and longitudinal and transverse tensile strengths of the packaging substrate.

[0075] (Package for paper products) Using a film with a perimeter of 380 mm (front width 115 mm, folding width 37.5 mm each) × pitch 298 mm as the packaging substrate, packaging was performed. Into the packaging substrate prepared with the above dimensions, 200 sets of 2-ply lotion-free tissue paper were placed as paper products, and sealed by gusset packaging to obtain a package for paper products with dimensions of 230 mm in the long side direction (MD direction) of the film packaging substrate × 115 mm in the short side direction (CD direction) of the film packaging substrate × 75 mm in height. Note that a form of wrapping the paper product with a tubular film was used. Also, after inserting the paper product, the excess in the pitch direction was cut to produce a package for paper products.

[0076] Then, the height (A), short side length (B), long side length (C) of the package for paper products, and the height (D), short side length (E), long side length (F) of the laminate were measured, and the package filling rate was calculated.

[0077] (Ease of taking out paper products (ease of use of the package)) Regarding the package for paper products produced, when the perforation at the take-out opening was opened and the paper products were taken out from the package for use, 20 monitors evaluated the ease of taking out the paper products (ease of use of the package). The evaluation criteria are as follows. A: 0 - 1 person who felt it was difficult to take out the paper products B: 2 - 3 people who felt it was difficult to take out the paper products C: 4 - 6 people who felt it was difficult to take out the paper products D: 7 - 20 people who felt it was difficult to take out the paper products

[0078] (Ease of holding the package) Regarding the package for paper products produced, 20 monitors evaluated the ease of holding it. The evaluation criteria are as follows. A: 0 - 1 person who felt that the package was too small or too large and difficult to hold B: 2 - 3 people who felt that the package was too small or too large and difficult to hold C: 4 - 6 people who felt that the package was too small or too large and difficult to hold D: 7 - 20 people who felt that the package was too small or too large and difficult to hold

[0079] (Ease of opening the perforation) Regarding the package for paper products produced, 20 monitors evaluated the ease of cutting the perforation when taking out the paper products. The evaluation criteria are as follows. A: 0 - 1 person who felt it was difficult to open the perforation B: 2 - 3 people who felt it was difficult to open the perforation C: 4 - 6 people who felt it was difficult to open the perforation D: 7 - 20 people who felt it was difficult to open the perforation

[0080] (Example 1) - (Example 25), (Comparative Example 1) - (Comparative Example 14) For Examples 1 to 25 and Comparative Examples 1 to 14, in the same manner as in Example 3, a film packaging base material having the physical properties shown in Tables 1 to 3 was produced. Using this, in the same manner as in Example 3, a package for paper products was produced, and the ease of taking out the paper product, the ease of holding the package, and the ease of opening the perforation during use were evaluated.

[0081]

Table 1

[0082]

Table 2

[0083]

Table 3

[0084] As is clear from the results shown in Tables 1 to 3, all of the packages for paper products of Examples 1 to 25 were easy to take out the paper product, easy to hold the package, and easy to open the perforation. On the other hand, all of Comparative Examples 1 to 14 were inferior in any one of the ease of taking out the paper product, the ease of holding the package, and the ease of opening the perforation.

[0085] From the above, according to the present example, it was confirmed that the present invention can provide a package for paper products that is easy to take out the paper product, easy to hold the package, and easy to open the perforation at the outlet of the package, even when the paper product, particularly a paper product with a high specific volume without lotion coating such as tissue paper, is used as the object to be packaged.

Explanation of Signs

[0086] 1 Package for paper products 10 Film packaging base material 11 Paper product laminate 12 Valley fold 13 Seal part 14 Perforation 15 Outlet 16 insertion port 21 paper product (tissue paper)

Claims

1. A packaging body for paper products, which is a film packaging base material having four mountain-folded portions extending in a substantially parallel one direction, a laminate of paper products not coated with lotion is covered, and the laminate is sealed by a seal portion, All of the mountain-folded portions have ruled lines, The seal portion is formed by substantially straight lines orthogonal to the direction of the mountain-folded portion at both ends of the mountain-folded portion, and each seal portion is formed substantially parallel to each other, The packaging form by the film packaging base material is a gusset packaging, The basis weight of the film packaging base material is 20 g / m ２ or more and 110 g / m ２ or less, The ratio (packaging body filling rate) of the volume of the laminate to the volume of the laminate accommodating portion in the packaging base material is 70% or more and 160% or less, The laminate laminates 2 or more plies of the paper products in 70 sets or more and 270 sets or less, The paper product has a specific volume of 4.0 cm ３ / g or more and 9.0 cm ３ / g or less, At least one or more linear perforation extraction openings parallel to the mountain-folded portion are formed on the top surface portion of the packaging body, The perforation has a bonding rate of 5% or more and 60% or less, a ratio defined by ((length of the perforation ÷ long side length of the paper product laminate) × 100 (%)) of 40% or more and 90% or less, and a tensile strength of 500 gf or more and 4500 gf or less. A packaging body for paper products, characterized in that.

2. The packaging body for paper products according to claim 1, characterized in that the longitudinal tear strength of the film packaging base material is 3 N or more and 19 N or less.

3. The packaging body for paper products according to claim 1, characterized in that the transverse tear strength of the film packaging base material is 5 N or more and 27 N or less.

4. The packaging body for paper products according to claim 1, characterized in that the longitudinal tensile strength of the film packaging base material is 7 N or more and 39 N or less.

5. The packaging body for paper products according to claim 1, characterized in that the transverse tensile strength of the film packaging base material is 5 N or more and 30 N or less.

6. The packaging body for paper products according to claim 1, characterized in that the thickness of the film packaging base material is 20 μm or more and 120 μm or less.

7. The packaging body for paper products according to claim 1, characterized in that the paper thickness per 10 sheets of the paper product is 0.60 mm / 10 sheets or more and 1.2 mm / 10 sheets or less.

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