Tissue paper package

Abstract

To provide a tissue paper package that exhibits low replacement frequency of the tissue paper package, is convenient for carrying, provides excellent softness of the tissue paper, prevents a laminate from being peeled during packaging, and allows the perforation to be easily opened.SOLUTION: According to a package comprising a layer of a satin-finished polyethylene film as an outermost layer, when a basis weight of tissue paper is represented by C, a tensile strength in a drawing direction is represented by DT, and a tensile strength in a direction perpendicular to the drawing direction is represented by ET, a value obtained by dividing the square root of the product of DT and ET by 2 times C is 0.038 or more and 0.085 or less; the number of sets of tissue paper is 160 sets or more and 280 sets or less; a tissue laminate has a height of 50 mm or more and 100 mm or less; the tissue laminate has a density of 0.11 g / cm3 or more and 0.23 g / cm3 or less; and the tensile strength of a packaging substrate at the perforation is 3 N / 50 mm or more and 32 N / 50 mm or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tissue paper package.

Background Art

[0002] Thin papers such as tissues are usually sold in a form where a plurality of sheets are stacked and packaged.

[0003] Such sales packages of thin papers include, in addition to box-shaped cartons made of rigid paper, soft packs made of soft paper or plastic films, and such soft packs are convenient for carrying.

[0004] As packaging forms of soft packs for thin papers, caramel packaging and pillow packaging are often used. Caramel packaging has a good form (appearance) of the package and a tight package. Therefore, when opening the perforation at the outlet of the package, the package can be firmly held by hand, so it is easy to open the perforation.

[0005] On the other hand, caramel packaging is difficult to package in place of the good form of the package. Specifically, if the height of the laminate of thin papers does not become constant to a certain extent, the heat seal during packaging is not stable. Therefore, due to the difference in the height of the laminate between the upper roll and the lower roll of the parent roll, defective products are likely to occur during packaging depending on the parent roll.

[0006] Also, compared with caramel packaging, pillow packaging is easy to package, but is inferior in the form of the package.

[0007] As a package of thin papers by such caramel packaging, for example, Patent Document 1 discloses a sheet package having a sheet laminate in which a plurality of moisture-retaining sheets are laminated and a packaging bag for packaging the sheet laminate, and the sheet laminate is accommodated in the packaging bag in a state compressed at a compression rate of 50% or more and 80% or less in the lamination direction. Also described is that the sheet laminate is caramel-packaged.

[0008] On the other hand, as a wrapper for tissue paper by pillow packaging, for example, Patent Document 2 discloses a pillow packaging bag that houses a plurality of laminated sheets and has a pair of seal portions at both longitudinal ends, and an opening formed on the upper surface of the pillow packaging bag and extending in the longitudinal direction of the pillow packaging bag. The pillow packaging bag has a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one surface of the paper layer, the ratio of the paper component is 50% or more, and when the ply number of the sheet is 1 ply, the length of the opening is 80% or more and 100% or less with respect to the distance between the pair of seal portions in the longitudinal direction of the upper surface. When the ply number of the sheet is 2 plies or more, the length of the opening is 70% or more and 90% or less with respect to the distance between the pair of seal portions in the longitudinal direction of the upper surface. A sheet wrapper is disclosed.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] By the way, when a tube-shaped film is used as the packaging base material of the wrapper, the form of the wrapper is good. Therefore, when opening the perforation of the opening, it is easy to open. However, when the tissue laminate is a soft tissue, when inserting the laminate into the tube-shaped film, the upper or lower part of the laminate may come into contact with the film and be turned up to become defective products.

[0011] Therefore, it is necessary to use a film with a circumference increased within a certain range with respect to the circumference of the laminate. In such a case, when opening the perforation of the opening of the wrapper, the tightness of the wrapper is poor and it becomes difficult to hold the wrapper firmly by hand, so it becomes difficult to open the perforation.

[0012] In this case, if the stitch bond rate of the perforation is lowered, it becomes easier to open the perforation at the outlet. However, when using a tube-shaped film for the packaging base material, when inserting the laminate into the film during packaging, it is necessary to spread the film, so the perforation may accidentally open at that time, resulting in defective products.

[0013] Furthermore, when using a matte polyethylene film for the outermost layer of the film (the surface that touches the packaging by hand), while it has a high-class feeling, the film is smooth and slippery, and since the inner tissue laminate is soft, the form of the packaging body is not stable, and there is a problem that it becomes more difficult to open the perforation. Also, when trying to open the perforation with strong force, the perforation tears (cuts) from both ends of the perforation, and the outlet becomes too large and difficult to use (drop-back is likely to occur).

[0014] The present invention has been made in view of such circumstances, and in a packaging body in which a tissue laminate is gusset-packaged with a tube-shaped film using a matte polyethylene film for the outermost layer, the replacement frequency of the tissue paper packaging body is low, it is convenient to carry, the softness of the tissue paper is good, the laminate is difficult to turn up during packaging, it is easy to open a single-line perforation, and the perforation does not accidentally open or spread too much when opened. The purpose is to provide a tissue paper packaging body that does not occur.

Means for Solving the Problems

[0015] The inventors have conducted intensive studies and found that in a tissue paper package, the packaging base material is a tubular film having at least a layer of embossed polyethylene film on the outermost layer, covered with a tissue laminate in which tissue paper is laminated, and the tissue laminate is sealed by a seal portion. The packaging base material has a single-line perforation for forming an outlet for the tissue paper. By defining the relationship between the basis weight and tensile strength of the tissue paper, defining the number of layers, height, and density of the tissue laminate, setting the packaging form by the packaging base material as a gusset packaging, and further defining the tensile strength of the packaging base material at the perforation, it is possible to obtain a tissue paper package with a low replacement frequency, convenient to carry, good softness of the tissue paper, difficult for the laminate to curl during packaging, easy to open the single-line perforation, and no accidental opening of the perforation or excessive tearing and spreading of the perforation during opening. The inventors have found that the above problems can be solved and have completed the present invention. That is, the present invention provides the following.

[0016] (1) A first aspect of the present invention is a tissue paper package in which a packaging base material is a tubular film having at least a layer of embossed polyethylene film on the outermost layer, covered with a tissue laminate in which tissue paper is laminated, and the tissue laminate is sealed by a seal portion. The packaging base material has a single-line perforation for forming an outlet for the tissue paper. When the basis weight of the tissue paper is C, the tensile strength in the pulling direction is DT, and the tensile strength in the direction perpendicular to the pulling direction is ET, the value obtained by dividing the square root of the product of DT and ET by 2C (=(DT×ET) 1 / 2 / (2×C)) is 0.038 or more and 0.085 or less. The number of layers of the tissue paper contained in the tissue laminate is 160 or more and 280 or less. The height of the tissue laminate is 50 mm or more and 100 mm or less. The density of the tissue laminate is 0.11 g / cm 3 or more and 0.23 g / cm 3It is as follows, wherein the packaging form by the packaging base material is a gusset packaging, and the tensile strength of the packaging base material at the perforation is 3 N / 50 mm or more and 32 N / 50 mm or less. It is a tissue paper package characterized by this.

[0017] (2) The second aspect of the present invention is the tissue paper package according to (1), characterized in that the bond rate of the perforation is 6% or more and 60% or less.

[0018] (3) The third aspect of the present invention is the tissue paper package according to (1), characterized in that when the perimeter of the packaging base material is A and the perimeter of the tissue laminate is B, ((A / B)×100(%)) is 98% or more and 111% or less.

[0019] (4) The fourth aspect of the present invention is the tissue paper package according to (1), characterized in that the packaging base material has a layer of milky white polyethylene film on the innermost layer.

[0020] (5) The fifth aspect of the present invention is the tissue paper package according to (1), characterized in that the ash content of the packaging base material is 1.5% or more and 12% or less.

[0021] (6) The sixth aspect of the present invention is the tissue paper package according to (5), characterized in that the content of titanium oxide contained in the ash of the packaging base material is 50% or more.

[0022] (7) The seventh aspect of the present invention is the tissue paper package according to (1), characterized in that the thickness of the packaging base material is 35 μm or more and 100 μm or less.

[0023] (8) The eighth aspect of the present invention is the tissue paper package according to (1), characterized in that the tensile strength of the packaging base material in the MD direction is 10 N or more and 32 N or less.

[0024] (9) The ninth aspect of the present invention is the tissue paper package described in (1), characterized in that the tearing strength in the MD direction of the packaging base material is 5 N or more and 16 N or less.

[0025] (10) The tenth aspect of the present invention is the tissue paper package described in (1), characterized in that in the tissue laminate, the tissue paper is V-folded and laminated.

[0026] (11) The eleventh aspect of the present invention is the tissue paper package described in (1), characterized in that the specific volume of the tissue paper is 4.5 cm 3 / g or more and 7.5 cm 3 / g or less.

[0027] (12) The twelfth aspect of the present invention is the tissue paper package described in (1), characterized in that the DT of the tissue paper is 2.0 N / 25 mm or more and 4.1 N / 25 mm or less.

[0028] (13) The thirteenth aspect of the present invention is the tissue paper package described in (1), characterized in that the ET of the tissue paper is 0.6 N / 25 mm or more and 1.6 N / 25 mm or less.

Advantages of the Invention

[0029] According to the present invention, in a package in which a tissue laminate is gusset-packed with a tube-shaped film using a matte polyethylene film as the outermost layer, the replacement frequency of the tissue paper package is low, it is convenient to carry, the softness of the tissue paper is good, the laminate is difficult to curl during packaging, the single-line perforation is easy to open, and the perforation is not accidentally opened or overly cut and spread during opening. It is possible to provide a tissue paper package.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0031] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. However, these are presented for illustrative purposes and do not limit the present invention.

[0032] In this specification, the MD direction and the CD direction respectively mean the manufacturing line direction (conveying direction) during the manufacture of the tissue paper package and the direction orthogonal to the manufacturing line direction.

[0033] <Tissue paper package> Figure 1 is a perspective view showing an example of a tissue paper package (hereinafter, also simply referred to as "package") and a tissue laminate of the present invention. The package 1 of the present invention is a packaging base material 10 of a tube-shaped film having at least a layer of embossed polyethylene film as the outermost layer, and a tissue (hereinafter, also simply referred to as "laminate") laminate 11 in which tissue paper 21 is laminated is covered, and the tissue laminate 11 is sealed by a seal portion 12. The seal portion 12 is preferably provided at an end portion where the packaging base material 10 overlaps. At this time, as shown in FIG. 1, the seal portion 12 is preferably formed in a substantially straight line (or may be a dotted line) at a position about 10 mm from each of both ends of the package 1, and the seal portions 12 are substantially parallel to each other. However, as long as the sealing property of the package 1 (adhesiveness of the seal portion 12) can be ensured, it may be formed at other locations.

[0034] The package 1 is provided with a take-out port 14 for taking out the tissue paper 21. This take-out port 14 is formed by the packaging base material 10 having a single-line perforation 13 for forming the take-out port 14 of the tissue paper 21, and by cutting and opening the perforation 13 during use. As shown in FIG. 2, by sequentially pulling out (taking out) the tissue paper 21 from the formed take-out port 14, the required number of sheets of the tissue paper 21 can be obtained.

[0035] (Length of the perforation) The perforation 13 is provided on the surface of the packaging base material 10 that covers the upper part of the laminate 11 so as to be substantially parallel to one side of the tissue paper 21. Also, it is preferably provided so as to be disposed above the central portion of the laminate 11. The lower limit value of the total length of the perforation 13 is preferably 60 mm or more, more preferably 70 mm or more, and still more preferably 80 mm or more. Also, the upper limit value is preferably 180 mm or less, more preferably 150 mm or less, and still more preferably 120 mm or less. In addition, the length direction of the single-line perforation 13 is preferably parallel to the MD direction of the packaging base material 10.

[0036] (Length of the connecting part of the perforations) The lower limit of the length of the connecting part of the perforation 13 is preferably 0.2 mm or more, more preferably 0.3 mm or more, and still more preferably 0.5 mm or more. 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 13 is less than 0.2 mm, the perforation 13 will open during packaging with the packaging base material 10, and if it exceeds 3.0 mm, it will be difficult to open the perforation 13.

[0037] (Length of the cutting line of the perforations) The lower limit of the length of the cutting line of the perforation 13 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 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 cutting line of the perforation 13 is less than 0.5 mm, it will be difficult to open the perforation 13, and if it exceeds 4.5 mm, the perforation 13 will open during packaging with the packaging base material 10.

[0038] (Bonding rate of the perforations) The bonding rate of the perforation 13 (the ratio of the connecting part of the perforation 13) is preferably 6% or more and 60% or less. If the bonding rate is less than 6%, the perforation 13 will open during packaging with the packaging base material 10, and if it exceeds 60%, it will be difficult to open the perforation 13. The lower limit of the bonding rate of the perforation 13 is more preferably 10% or more, and still more preferably 20% or more. The upper limit is more preferably 45% or less, and still more preferably 35% or less. Incidentally, the length of the connecting part and the cutting line of the perforation 13 are measured with a microscope. The bonding rate of the perforation 13 (the ratio of the connecting part of the perforation 13) is determined as follows. Bonding rate of perforation 13 (%) = length of connecting part of perforation 13 / (length of connecting part of perforation 13 + length of cutting line of perforation 13) × 100

[0039] (Packaging base material) The packaging base material 10 is a tubular film having at least a layer of embossed polyethylene film as the outermost layer. Also, it is preferable that the packaging base material 10 does not contain paper, and it is preferable that the packaging base material 10 has printing. The basis weight and ash content values described later shall be values including the printing ink.

[0040] (Tubular film) The film constituting the tubular film has at least a layer of embossed polyethylene film as the outermost layer. If the material of the outermost layer is other than the embossed polyethylene film, the touch feeling of the film is inferior. Note that the tubular film is a film formed by cylindrically forming a sheet-like film like a tube.

[0041] (Film layer) The tubular film is formed of multiple layers. If the tubular film is single-layer, its strength is inferior, so the perforation 13 will tear (break) from both ends. Regarding the layers other than the outermost 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 be performed, but from the viewpoints of cosmetic properties and non-slip properties, among others, an embossed polyethylene film is preferably used. Examples of the material of the plastic film include conventionally known thermoplastic resins such as polyolefin (such as polyethylene and polypropylene), polyester (such as PET), polyamide (such as nylon), polycarbonate, polystyrene, and polyvinyl chloride, and polyethylene is preferably used.

[0042] As a specific configuration, when the tubular film is formed of multiple layers, it is preferable that the material of the film in the outermost layer of the film base material is embossed polyethylene, and the material in the innermost layer is an opaque white polyethylene film. If the innermost layer is other than the opaque white polyethylene film, the upper and lower parts of the laminate 11 are likely to turn up during packaging.

[0043] In the embossed polyethylene film which is the outermost layer of the tubular film, the method of embossing the film is not particularly limited, and a conventionally known method, a method of pressing the surface of the tubular film against an embossing roll or a matte roll to give unevenness, a method of giving unevenness by a sandblasting method, etc. can be adopted. These methods may be carried out at the time of forming the tubular film, but it is preferable to carry out them 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, a method of biaxially stretching a laminate of a polyolefin-based resin blend, etc. can also be adopted.

[0044] The tubular film is preferably made into a multilayer film by extrusion laminating the outermost embossed polyethylene film and the innermost milky white film. By making it multilayer by lamination, even if a single-line perforation 13 is provided, the perforation 13 is less likely to tear (be difficult to cut) from both ends of the perforation 13.

[0045] The packaging base material 10 of the present invention may have other layers in addition to the layers of the tubular film. Examples of other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improvement layer, an overprint layer, a light shielding layer, etc. These other layers can be provided, for example, on the surface in contact with the tissue laminate 11 or on the surface in contact with the outside air. It should be noted that the layers described above are not related to the number of layers of the film.

[0046] The printing layer is preferably provided between the outermost embossed polyethylene film and the innermost milky white polyethylene film. By doing so, while maintaining a good touch of the film, the tissue laminate 11 is less likely to turn up during packaging.

[0047] (Thickness of the packaging base material) The thickness of the packaging base material 10 is preferably 35 μm or more and 100 μm or less. If the thickness is less than 35 μm, the perforation 13 will open during packaging. If it exceeds 100 μm, it will be difficult to open the perforation 13. The lower limit value of the thickness of the packaging base material 10 is more preferably 50 μm or more, and even more preferably 60 μm or more. The upper limit value is more preferably 90 μm or less, and even more preferably 80 μm or less. The thickness of the packaging base material 10 can be measured in accordance with JIS K7130.

[0048] (Perimeter (A) of the packaging base material) The lower limit value of the perimeter of the packaging base material 10 (hereinafter also referred to as "A") is preferably 335 mm or more, more preferably 350 mm or more, and even more preferably 365 mm or more. The upper limit value is preferably 440 mm or less, more preferably 420 mm or less, and even more preferably 400 mm or less. If the perimeter is less than 335 mm, the upper and lower parts of the laminate 11 are likely to turn up during packaging. If it exceeds 440 mm, the tightness of the package 1 is poor and it is difficult to open the perforation 13. The perimeter of the packaging base material 10 can be measured by cutting the packaging base material 10 and using a ruler, and it is the direction along the CD direction of the film.

[0049] (Ash content of the packaging base material) The ash content of the packaging base material 10 is preferably 1.5% or more and 12.0% or less. If the ash content is less than 1.5%, the upper and lower parts of the laminate 11 will turn up during packaging. If it exceeds 12.0%, the strength of the packaging base material 10 will be weakened and the perforation 13 will open during packaging. The lower limit value of the ash content of the packaging base material 10 is more preferably 2.0% or more, and even more preferably 2.5% or more. The upper limit value is more preferably 10.0% or less, and even more preferably 8.0% or less.

[0050] The ash content refers to the ratio of minerals such as calcium, iron, sodium, magnesium, phosphorus, and potassium, and can be measured in accordance with JIS P 8251. Although the ash content is obtained by the following formula, the absolute dry mass of the test piece is not measured, and the mass of the test piece of the packaging base material 10 when conditioned at 23°C and 50% humidity is regarded as the absolute dry mass. Ash content (%) = mass of residue (g) ÷ absolute dry mass of test piece (g) × 100

[0051] (Titanium oxide contained in ash) The content of titanium oxide contained in the ash of the packaging base material 10 is preferably 50% or more, more preferably 55% or more, and still more preferably 60% or more. If the content of titanium oxide is less than 50%, the upper and lower parts of the laminate 11 will curl during packaging. The content of titanium oxide contained in the ash of the packaging base material 10 can be measured by elemental analysis.

[0052] (Tensile strength in the MD direction) The tensile strength of the packaging base material 10 in the MD direction is preferably 10 N or more and 32 N or less. If the tensile strength in the MD direction is less than 10 N, the perforation 13 will open during packaging, and if it exceeds 32 N, the perforation 13 will be difficult to open. The lower limit value of the tensile strength in the MD direction is more preferably 15 N or more, and still more preferably 18 N or more. The upper limit value is more preferably 29 N or less, and still more preferably 26 N or less.

[0053] (Tensile strength in the CD direction) The lower limit value of the tensile strength of the packaging base material 10 in the CD direction is preferably 8 N or more, more preferably 12 N or more, and still more preferably 14 N or more. The upper limit value is preferably 25 N or less, more preferably 22 N or less, and still more preferably 20 N or less. If the tensile strength in the CD direction is less than 8 N, the perforation 13 will open during packaging, and if it exceeds 25 N, the perforation 13 will be difficult to open. The tensile strength of the packaging base material 10 in each direction is measured in accordance with JIS K 7127, and the width of the test piece is 10 mm.

[0054] (Tear strength in the MD direction) The tear strength of the packaging base material 10 in the MD direction is preferably 5 N or more and 16 N or less. If the tear strength in the MD direction is less than 5 N, the perforation 13 will open during packaging, and if it exceeds 16 N, the perforation 13 will be difficult to open. The lower limit value of the tear strength in the MD direction is more preferably 7 N or more, and still more preferably 9 N or more. The upper limit value is more preferably 14 N or less, and still more preferably 12 N or less.

[0055] (Tear strength in the CD direction) The lower limit of the tear strength in the CD direction of the packaging base material 10 is preferably 7 N or more, more preferably 10 N or more, and still more preferably 12 N or more. The upper limit is preferably 22 N or less, more preferably 19 N or less, and still more preferably 17 N or less. If the tear strength in the CD direction is less than 7 N, the perforation 13 will open during packaging, and if it exceeds 22 N, the perforation 13 will be difficult to open. The tear strength in each direction of the packaging base material 10 is measured in accordance with JIS K 7128-1.

[0056] (Tensile strength at the perforation part) The tensile strength of the packaging base material 10 at the perforation 13 is 3 N / 50 mm or more and 32 N / 50 mm or less. If the tensile strength at the perforation 13 is less than 3 N / 50 mm, the perforation 13 will open during packaging, and if it exceeds 32 N / 50 mm, the perforation 13 will be difficult to open. The lower limit of the tensile strength of the packaging base material 10 at the perforation 13 is preferably 5 N / 50 mm or more, more preferably 8 N / 50 mm or more. The upper limit is preferably 23 N / 50 mm or less, more preferably 16 N / 50 mm or less. The tensile strength of the packaging base material 10 at the perforation 13 is measured in accordance with JIS P 8113, and the tensile speed is 300 mm / min.

[0057] (Tissue paper) FIG. 3 is a perspective view showing an example of the tissue laminate 11 packaged in the package 1 of the present invention. Hereinafter, the tissue paper 21 and the tissue laminate 11 will be described in detail.

[0058] The tissue paper 21 included in the tissue laminate 11 is a soft tissue using thin paper. The tissue paper 21 may be 1-ply or 2-ply, but 2-ply is preferred.

[0059] (Basis weight (C) of the tissue) The lower limit of the basis weight per ply of the tissue paper 21 (hereinafter, also referred to as "C") is 12.0 g / m 2The above is preferable, 13.0 g / m 2 The above is more preferable, 13.5 g / m 2 The above is even more preferable. The upper limit is 17.0 g / m 2 The following is preferable, 16.0 g / m 2 The following is more preferable, 15.5 g / m 2 The following is even more preferable. When the basis weight is less than 12.0 g / m 2 the upper and lower parts of the laminate 11 are likely to curl, and when it exceeds 17.0 g / m 2 it is inferior in softness as a tissue. The basis weight per ply of the tissue paper 21 is measured in accordance with JIS P 8124.

[0060] (Thickness of the tissue) The lower limit of the thickness of the tissue paper 21 is preferably 0.70 mm / 10 sheets or more, more preferably 0.75 mm / 10 sheets or more, and even more preferably 0.80 mm / 10 sheets or more. The upper limit is preferably 1.05 mm / 10 sheets or less, more preferably 1.00 mm / 10 sheets or less, and even more preferably 0.95 mm / 10 sheets or less. When the paper thickness is less than 0.70 mm / 10 sheets, the upper and lower parts of the laminate 11 are likely to curl, and when it exceeds 1.05 mm / 10 sheets, it is inferior in softness as a tissue.

[0061] The thickness of the tissue paper 21 (for 10 sheets) 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, 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 tissue paper 21 is 2-ply, five sets of 2-ply tissue paper 21 are stacked and measured as 10 sheets, and the result is calculated as the thickness of 10 sheets. Also, the measurement is repeated 10 times (measuring 10 different locations instead of the same location 10 times), and the average of the measurement results is taken as the final paper thickness.

[0062] (Specific volume of the tissue) The specific volume of the tissue paper 21 is 4.5 cm3 7.3 cm / g or more 3 Less than 7.3 cm / g is preferred. When the specific volume is less than 4.5 cm 3 / g, the upper and lower parts of the laminate 11 are likely to curl. When it exceeds 7.3 cm 3 / g, it becomes bulky, so the number of sets of the tissue paper 21 that can be packaged with the package (film) decreases, and the replacement frequency deteriorates. The lower limit value of the specific volume of the tissue paper 21 is preferably 5.0 cm 3 / g or more, more preferably 5.5 cm 3 / g or more. The upper limit value is preferably 7.0 cm 3 / g or less, more preferably 6.5 cm 3 / g or less is even more preferable. The specific volume of the tissue paper 21 is obtained by dividing the paper thickness of the tissue paper 21 by the basis weight, and is expressed as the volume cm 3 per unit gram.

[0063] (Tensile strength of the tissue (DT)) The tensile strength (hereinafter also referred to as "DT") in the pulling direction from the outlet 14 of the tissue paper 21 is preferably 2.0 N / 25 mm or more and 4.1 N / 25 mm or less. When the tensile strength is less than 2.0 N / 25 mm, the upper and lower parts of the laminate 11 are likely to curl. When it exceeds 4.1 N / 25 mm, the softness as a tissue deteriorates. The lower limit value of DT of the tissue paper 21 is more preferably 2.3 N / 25 mm or more, and even more preferably 2.5 N / 25 mm or more. The upper limit value is more preferably 3.6 N / 25 mm or less, and even more preferably 3.1 N / 25 mm or less. The tensile strength DT is measured in accordance with JIS P 8113, and the pulling speed is 300 mm / min.

[0064] (Tensile strength of the tissue (ET)) The tensile strength in the direction perpendicular to the pulling direction from the outlet 14 of the tissue paper 21 (hereinafter, also referred to as "ET") is preferably 0.6 N / 25 mm or more and 1.6 N / 25 mm or less. If the tensile strength is less than 0.6 N / 25 mm, the upper and lower parts of the laminate 11 are likely to curl. If it exceeds 1.6 N / 25 mm, the softness as a tissue is inferior. The lower limit value of ET of the tissue paper 21 is more preferably 0.7 N / 25 mm or more, and even more preferably 0.8 N / 25 mm or more. The upper limit value is more preferably 1.4 N / 25 mm or less, and even more preferably 1.2 N / 25 mm or less. The tensile strength ET is measured in accordance with JIS P 8113, and the pulling speed is 300 mm / min.

[0065] (Relationship formula of tensile strength DT, ET and basis weight C) The value obtained by dividing the square root of the product of the above DT and ET by 2C (=(DT×ET) 1 / 2 / (2×C)) is 0.038 or more and 0.085 or less. If this value is less than 0.038, the upper and lower parts of the laminate 11 are likely to curl. If it exceeds 0.085, the softness as a tissue is inferior. The lower limit value of this value is preferably 0.045 or more, and even more preferably 0.052 or more. The upper limit value is preferably 0.075 or less, and even more preferably 0.065 or less.

[0066] (Mass of tissue laminate) The lower limit value of the mass of the tissue laminate 11 is preferably 145 g or more, more preferably 160 g or more, and even more preferably 170 g or more. The upper limit value is preferably 270 g or less, more preferably 245 g or less, and even more preferably 230 g or less. If the mass of the tissue laminate 11 is less than 145 g, the number of sets of the tissue laminate 11 decreases and the replacement frequency is poor, or the upper and lower parts of the laminate 11 are likely to curl during packaging. If it exceeds 270 g, the package 1 becomes too large and inconvenient to carry.

[0067] (Density of tissue laminate) The density of the tissue laminate 11 is 0.11 g / cm 3 or more and 0.23 g / cm 3The following applies. When the density is less than 0.11 g / cm 3 it becomes difficult to open the perforation 13, and when it exceeds 0.23 g / cm 3 the upper and lower parts of the laminate 11 are likely to curl during packaging. The lower limit value of the density is preferably 0.13 g / cm 3 or more, more preferably 0.15 g / cm 3 or more. The upper limit value is preferably 0.21 g / cm 3 or less, more preferably 0.19 g / cm 3 or less.

[0068] The mass and density of the tissue laminate 11 are measured by the following method. First, a tissue laminate 11 laminated with a tissue paper 21 having a long side (width) of 150 mm and a short side (depth) of 107 mm (when the laminate 11 is V-folded, when the tissue paper 21 is unfolded, the 107 mm of the short side becomes about 214 mm which is about twice) is collected from the package 1, and the mass of the tissue laminate 11 is measured with an electronic balance after conditioning at 23 °C and 50% (the size of the tissue paper 21 can be changed as appropriate). Then, the size (width, depth, height (length of the paper product)) of the tissue laminate 11 is measured with a ruler, and the density is calculated by the following formula. Density (g / cm of the tissue laminate 11 3 ) = Mass (g) of the tissue laminate 11 / (Width (cm) of the tissue laminate 11 × Depth (cm) of the tissue laminate 11 × Height (cm) of the tissue laminate 11) The long side (width), short side (depth), and height of the tissue laminate 11 are measured with a ruler as described later.

[0069] (Tissue laminate) The folding method of the tissue paper 21 included in the tissue laminate 11 is not particularly limited, but it is preferably V-folded and laminated. By being V-folded, the package 1 can be made such that the upper and lower parts of the laminate 11 are less likely to curl during packaging.

[0070] (Height of the tissue laminate) The height of the tissue laminate 11 is 50 mm or more and 100 mm or less. If the height is less than 50 mm, the number of sets of the tissue paper 21 described later is too small and it will be used up quickly, which is inconvenient for carrying. If the height exceeds 100 mm, as a result, the package 1 becomes too large and the replacement frequency is poor. The lower limit value of the height of the tissue laminate 11 is preferably 60 mm or more, more preferably 66 mm or more. The upper limit value is preferably 92 mm or less, more preferably 86 mm or less.

[0071] The height of the tissue laminate 11 can be measured as follows. After cutting the packaging base material 10 of the tissue paper package 1 and gently taking out the tissue laminate 11, place a 30 cm ruler (Straight Ruler Silver JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Measuring Co., Ltd.) along the long side direction at the center of the short side direction of the laminate 11, and measure the heights at both ends of the laminate 11. Similarly, place a 30 cm ruler along the short side direction at the center of the long side direction of the laminate 11, and measure the heights at both ends of the laminate 11. Average these four values to obtain the final height of the laminate 11. The height value obtained here is used when calculating the density of the tissue laminate 11 described above.

[0072] (Number of sets of tissue laminate) When the tissue paper 21 is 2-ply, the number of sets of the tissue paper 21 included in the tissue laminate 11 is 160 sets or more and 280 sets or less. If the number of sets is less than 160 sets, the number of sets of the tissue paper 21 is small and the replacement frequency of the package 1 becomes high. If the number of sets exceeds 280 sets, the package 1 becomes too large and it is inconvenient for carrying. The lower limit value of the number of sets of the tissue paper 21 included in the tissue laminate 11 is preferably 180 sets or more, more preferably 190 sets or more. The upper limit value is preferably 260 sets or less, more preferably 220 sets or less.

[0073] (Perimeter (B) of tissue laminate) The lower limit of the perimeter (hereinafter also referred to as "B") of the tissue laminate 11 is preferably 325 mm or more, more preferably 335 mm or more, and still more preferably 345 mm or more. The upper limit is preferably 425 mm or less, more preferably 395 mm or less, and still more preferably 385 mm or less. If the perimeter (B) is less than 325 mm, the number of sets of the tissue paper 21 is small and the replacement frequency of the package 1 is high. If the perimeter (B) exceeds 425 mm, the package 1 becomes too large and inconvenient to carry.

[0074] Incidentally, the perimeter (B) of the tissue laminate 11 can be measured as follows. Cut the packaging base material 10 of the tissue paper package 1 and gently take out the tissue laminate 11. Place a 30 cm ruler (Straightedge Silver JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Sokutei Co., Ltd.) along the short side direction at the center of the long side direction of the laminate 11, and measure the length (short side) of the top surface and the heights of both ends of the laminate 11. The sum of the length of the top surface × 2 + the numerical values of the two points of the heights at both ends is taken as the final perimeter of the tissue laminate 11. Next, place a 30 cm ruler (Straightedge Silver JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Sokutei Co., Ltd.) along the long side direction at the center of the short side direction of the laminate 11, and measure the length (long side) of the top surface. The values of the short side and the long side obtained here are used when calculating the density of the tissue laminate 11 described above.

[0075] (Perimeter ratio (A / B)) The ratio obtained by dividing the perimeter (A) of the packaging base material 10 by the perimeter (B) of the tissue laminate 11 (= perimeter (A) / perimeter (B) × 100 (%)) is preferably 98% or more and 111% or less. If the perimeter ratio is less than 98%, the upper and lower parts of the laminate 11 are likely to be turned up during packaging, and if it exceeds 111%, the tightness of the package 1 is poor and the perforation 13 is difficult to open. The lower limit of this perimeter ratio is more preferably 101% or more, and still more preferably 103% or more. The upper limit is more preferably 109% or less, and still more preferably 106% or less.

[0076] (Packaging form) As the packaging form of the package 1 according to the present invention, it is a gusset packaging.

[0077] Gusset packaging means, as shown in FIG. 4, a cylindrical shape formed by folding inwards both ends of the bottom or the mouth portion according to the length (height) of the bag as mountain fold portions, and inserting an object to be packaged (laminate 11) into the inside of a packaging base material 10 sealed at one side by a seal portion 12 through an insertion port 15, and sealing it in a horizontal single line by heat sealing or the like, and cutting it into individual bags at the sealed portion. This gusset packaging can be performed using known devices. Also, the laminate 11 may be inserted in a state where the packaging base material 10 at the portion of the insertion port 15 is inverted to the outside so as not to be wound inside.

[0078] As described above, the present invention has been described using embodiments, but 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 obvious 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

[0079] 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.

[0080] <Example> (Packaging base material) In Example 3, a film having a multilayer (three-layer) structure as a film base material (the outermost layer is a matte polyethylene film, the innermost layer is a milky white polyethylene film, and these are adhered by extrusion lamination) was prepared and used as it is as the packaging base material. The film was provided with printing. Table 1 shows the results of measuring the basis weight, thickness, and density of the packaging base material.

[0081] (Tissue paper package (gusset package)) As a packaging substrate, packaging was performed using a film with a perimeter of 370 mm (CD direction, front width 113 mm, folding width 36 mm each) × pitch 260 mm (MD direction). Inside this film, which is the packaging substrate, a tissue laminate with 200 sets of tissue papers was placed and sealed by gusset packaging to obtain a tissue paper package. Note that a form was adopted in which a paper product was wrapped with a tubular film (packaging substrate). Also, after inserting the tissue laminate, the excess in the pitch direction was cut to produce a package. In the tissue paper package, after packaging, the perimeter A of the packaging substrate and the perimeter B of the tissue laminate were measured, and a ratio (= A / B × 100 (%)) was calculated from the measured A and B.

[0082] (Ease of cutting of the perforation during packaging) Regarding 100 produced tissue paper packages, the ease of cutting of the perforation during packaging was evaluated. The evaluation criteria are as follows. 4: The ratio of packages in which the perforation was cut at all during packaging was less than 1%. 3: The ratio of packages in which the perforation was cut at all during packaging was 1% or more and less than 2%. 2: The ratio of packages in which the perforation was cut at all during packaging was 2% or more and less than 5%. 1: The ratio of packages in which the perforation was cut at all during packaging was 5% or more.

[0083] (Ease of cutting of the perforation when opening the tissue extraction opening) Regarding the produced tissue paper packages, the ease of cutting of the perforation when opening the tissue extraction opening was evaluated by 30 monitors. The evaluation criteria are as follows. 4: 28 or more monitors evaluated that the perforation was easy to cut. 3: 25 or more and 27 or fewer monitors evaluated that the perforation was easy to cut. 2: 22 or more and 24 or fewer monitors evaluated that the perforation was easy to cut. 1: 21 or fewer monitors evaluated that the perforation was easy to cut.

[0084] (Convenience of carrying) For the prepared tissue paper package, 30 monitors evaluated its convenience of carrying. The evaluation criteria are as follows. 4: 28 or more monitors evaluated that the package is not too small, not too large, and easy to carry 3: 25 to 27 monitors evaluated that the package is not too small, not too large, and easy to carry 2: 22 to 24 monitors evaluated that the package is not too small, not too large, and easy to carry 1: 21 or fewer monitors evaluated that the package is not too small, not too large, and easy to carry

[0085] (Low frequency of replacement of the tissue paper package) For the prepared tissue paper package, 30 monitors evaluated its low frequency of replacement. The evaluation criteria are as follows. 4: 28 or more monitors evaluated that the number of tissue paper sets is sufficient and the replacement frequency is low 3: 25 to 27 monitors evaluated that the number of tissue paper sets is sufficient and the replacement frequency is low 2: 22 to 24 monitors evaluated that the number of tissue paper sets is sufficient and the replacement frequency is low 1: 21 or fewer monitors evaluated that the number of tissue paper sets is sufficient and the replacement frequency is low

[0086] (Difficulty of the tissue laminate curling during packaging) For the prepared tissue paper package, the difficulty of the tissue laminate curling was evaluated. The evaluation criteria are as follows. 4: During packaging, the tissue paper hardly curled and could be packaged smoothly 3: During packaging, the tissue paper curled slightly but could still be packaged 2: During packaging, the tissue paper curled, but it was within an acceptable range 1: During packaging, the tissue paper curled significantly and became inferior

[0087] (Softness of tissue paper) Tissues were taken out from the produced tissue paper packages, and 30 monitors evaluated the softness of the tissues when actually used. The evaluation criteria are as follows. 4: 28 or more monitors evaluated the tissue paper as soft 3: 25 to 27 monitors evaluated the tissue paper as soft 2: 22 to 24 monitors evaluated the tissue paper as soft 1: 21 or fewer monitors evaluated the tissue paper as soft

[0088] (Toughness at both ends of the perforation) Regarding the produced tissue paper packages, 30 monitors evaluated the toughness (resistance to tearing) at both ends of the perforation when the perforation was opened. The evaluation criteria are as follows. ○: 3 or fewer monitors evaluated that both ends of the perforation were easy to tear ×: 4 or more monitors evaluated that both ends of the perforation were easy to tear

[0089] (Touch feeling of the packaging base material) Regarding the produced tissue paper packages, 30 monitors evaluated the touch feeling of the packaging base material when touching the surface of the package by hand. The evaluation criteria are as follows. ○: 27 or more monitors evaluated that the touch feeling of the packaging base material was smooth and had a high-class feeling, and was good ×: 26 or fewer monitors evaluated that the touch feeling of the packaging base material was smooth and had a high-class feeling, and was good

[0090] (Example 1) to (Example 27), (Comparative Example 1) to (Comparative Example 15) In the same manner as in Example 3, packaging base materials having the physical properties shown in Tables 1 to 3 were produced for Examples 1 to 2, 4 to 27 and Comparative Examples 1 to 15. Using these, in the same manner as in Example 3, tissue paper packages (gusset packages) were produced, and the above evaluations were performed.

[0091]

Table 1

[0092]

Table 2

[0093]

Table 3

[0094] As is clear from the results shown in Tables 1 to 3, all of the packages of Examples 1 to 27 were difficult to cut the perforations during packaging, and the laminate was also difficult to turn up. Further, the perforations were easy to open, and did not cut too much during opening. Moreover, they were easy to carry, had a low package replacement frequency, the tissue paper was soft, and the touch of the packaging base material was excellent. On the other hand, all of Comparative Examples 1 to 14 were inferior in any of the difficulty of cutting the perforations during packaging and the difficulty of turning up the laminate, the ease of opening the perforations during pulling out, the difficulty of cutting both ends of the perforations during opening, the ease of carrying, the low package replacement frequency, and the touch of the packaging base material. From the above, according to this example, it was confirmed that it is possible to provide a tissue paper package with a low package replacement frequency, convenient for carrying, good softness of the tissue paper, difficult for the laminate to turn up during packaging, easy to open the perforations in the form of a single line, and not accidentally opening the perforations or the perforations cutting too much and spreading during opening.

Explanation of Signs

[0095] 1 (Tissue paper) package 10 Packaging base material 11 (Tissue paper) laminate 12 Seal part 13 Perforation 14 Take-out port 15 Insertion port 21 Tissue paper

Claims

1. A packaging substrate for a tubular film having at least a layer of embossed polyethylene film as the outermost layer, wherein a tissue laminate laminated with tissue paper is covered, and the tissue laminate is sealed by a seal portion, and the packaging substrate has a single-line perforation for forming an extraction opening of the tissue paper, a tissue paper package, wherein When the basis weight of the tissue paper is C, the tensile strength in the drawing direction is DT, and the tensile strength in the direction perpendicular to the drawing direction is ET, the value obtained by dividing the square root of the product of DT and ET by twice C (= (DT × ET) １／２ / (2 × C)) is 0.038 or more and 0.085 or less, the number of sets of the tissue paper contained in the tissue laminate is 160 sets or more and 280 sets or less, the height of the tissue laminate is 50 mm or more and 100 mm or less, The density of the tissue laminate is 0.11 g / cm ３ or more and 0.23 g / cm ３ or less, and the packaging form by the packaging substrate is a gusset packaging, the tensile strength of the packaging substrate at the perforation is 3 N / 50 mm or more and 32 N / 50 mm or less, a tissue paper package.

2. The tissue paper package according to claim 1, wherein the bonding rate of the perforation is 6% or more and 60% or less.

3. The tissue paper package according to claim 1, wherein when the perimeter of the packaging substrate is A and the perimeter of the tissue laminate is B, ((A / B)×100 (%)) is 98% or more and 111% or less.

4. The tissue paper package according to claim 1, wherein the packaging substrate has a layer of milky white polyethylene film as the innermost layer.

5. The tissue paper package according to claim 1, wherein the ash content of the packaging substrate is 1.5% or more and 12% or less.

6. The tissue paper package according to claim 5, wherein the content of titanium oxide contained in the ash of the packaging substrate is 50% or more.

7. The tissue paper package according to claim 1, wherein the thickness of the packaging substrate is 35 μm or more and 100 μm or less.

8. The tissue paper package according to claim 1, wherein the tensile strength of the packaging substrate in the MD direction is 10 N or more and 32 N or less.

9. The tissue paper package according to claim 1, wherein the tear strength of the packaging substrate in the MD direction is 5 N or more and 16 N or less.

10. The tissue paper package according to claim 1, wherein in the tissue laminate, the tissue paper is V-folded and laminated.

11. The specific volume of the tissue paper is 4.5 cm ３ / g or more and 7.5 cm ３ / g or less, and the tissue paper package according to claim 1 is characterized by this.

12. The tissue paper package according to claim 1, wherein the DT of the tissue paper is 2.0 N / 25 mm or more and 4.1 N / 25 mm or less.

13. The tissue paper package according to claim 1, wherein the ET of the tissue paper is 0.6 N / 25 mm or more and 1.6 N / 25 mm or less.

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