Package for paper product

Abstract

To provide a package for a paper product excellent in operability allowing easy packing and good in beautiful appearance of the paper product and the package after packing even when the paper product, especially a paper product such as stacked thin paper is a product to be packed.SOLUTION: Provided is a package for a paper product in which the paper product is covered by a packaging material of a tube-like film and the paper product is sealed by a seal part, wherein a packaging form with the packaging material is a gusset package, a thickness of the packaging material is 22 μm or more and 122 μm or less, the paper product is a tissue laminated body obtained by laminating two-ply tissue paper not applied with lotion by 70 sets or more and 150 sets or less, a mass of the tissue laminated body is 45 g or more and 175 g or less, a density is 0.10 g / cm3 or more and 0.24 g / cm3 or less, and a dynamic friction coefficient between the packaging material and the tissue paper is 0.14 or more and 0.24 or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging body for paper products, particularly suitable for packaging paper products such as tissue paper.

Background Art

[0002] Conventionally, there have been known packaging bodies 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.

[0003] Among them, packaging bodies for laminated tissue paper as objects to be packaged have conventionally been mostly packaged in paper box-type cartons. However, in recent years, due to ease of carrying, so-called soft pack tissues packaged with a film instead of a carton have also been sold.

[0004] In particular, as a film-packaged high-grade lotion tissue paper, products packaged in a caramel package have been sold, which is similarly convenient for carrying.

[0005] The caramel package has a good form (appearance) of the packaging body. On the other hand, although the caramel package has a good form of the packaging body, it is difficult to package. Specifically, unless the height of the laminate of the tissue paper becomes somewhat constant, the heat seal during packaging is unstable. Therefore, the height of the laminate is different between the upper roll and the lower roll of the tissue paper parent roll, and defective products are likely to occur during packaging depending on the parent roll.

[0006] Also, another packaging form, the pillow package, is easy to package but inferior in the form of the packaging body. In film packaging, when a tube-shaped film is used, the form of the packaging body becomes good. However, 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 turn up to become defective products.

[0007] As a wrapper for tissue paper with caramel wrapping, for example, Patent Document 1 discloses a sheet laminate in which a plurality of moisture-retaining sheets are laminated, and a packaging bag for packaging the sheet laminate. The sheet laminate is housed in the packaging bag in a state of being compressed at a compression rate of 50% or more and 80% or less in the lamination direction. It is also described that the sheet laminate is caramel-wrapped.

[0008] On the other hand, as a wrapper for tissue paper with pillow wrapping, 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 ends in the longitudinal direction, and an outlet 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. When the ply number of the sheet is 1 ply, the length of the outlet 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 outlet 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] When a paper product, particularly a paper product such as laminated tissue paper (hereinafter also referred to as a clip), is used as an object to be wrapped, during operation, friction occurs between the film and the sheet, making it difficult to insert the object to be wrapped into the wrapper and resulting in poor operability. Due to friction, there is also a problem that the clip bends and wrinkles, deteriorating the cosmetic appearance. Conversely, if there is no friction and it slides too much, the clip will not be stable in the film and will move, causing the clip to bend and wrinkle, thus deteriorating the cosmetic appearance.

[0011] Also, when the size of the film remains the same and the clip height is low, the clip will be even less stable and move in the film. Furthermore, if the film thickness is too high, it will be difficult to bend the film at the appropriate position, making it difficult to package. Conversely, if it is too thin, the films will stick together and not open properly, making it difficult to insert the clip and deteriorating the operability.

[0012] The present invention has been made in view of such circumstances, and even when a paper product, particularly a paper product such as laminated tissue paper, is used as an object to be packaged, it is an object of the present invention to provide a packaging body for paper products that is easy to package, has excellent operability, and has good cosmetic appearance of the paper product and the package after packaging.

Means for Solving the Problems

[0013] The inventor has conducted intensive studies and, in a packaging body for paper products in which a paper product is covered with a tubular film as a packaging base material and the paper product is sealed by a seal portion, defines the packaging form by the packaging base material and the form of the paper product, and also defines the thickness of the packaging base material, the mass, density of the tissue laminate, the number of tissue paper layers, and the coefficient of kinetic friction between the packaging base material and the tissue paper. By doing so, even when a paper product, particularly a paper product such as laminated tissue paper, is used as an object to be packaged, it is possible to obtain a packaging body for paper products that is easy to package, has excellent operability, and has good cosmetic appearance of the paper product and the package after packaging, and has found that the above problems can be solved, thus completing the present invention. That is, the present invention provides the following.

[0014] (1) The first aspect of the present invention is a packaging body for a paper product, which is a tubular film packaging base material, the paper product is covered, and the paper product is sealed by a seal part. The packaging form by the packaging base material is a gusset packaging, the thickness of the packaging base material is 22 μm or more and 122 μm or less, the paper product is a tissue laminate obtained by laminating 70 sets or more and 150 sets or less of non-two-ply lotion-processed tissue papers, the mass of the tissue laminate is 45 g or more and 175 g or less, and the density is 0.10 g / cm 3 or more and 0.24 g / cm 3 or less, and the coefficient of kinetic friction between the packaging base material and the tissue paper is 0.14 or more and 0.24 or less. It is a packaging body for a paper product, characterized by this.

[0015] (2) The second aspect of the present invention is the packaging body for a paper product according to (1), wherein the basis weight of the packaging base material is 20 g / m 2 or more and 110 g / m 2 or less. It is characterized by this.

[0016] (3) The third aspect of the present invention is the packaging body for a paper product according to (1), wherein the coefficient of static friction between the packaging base material and the tissue paper is 0.20 or more and 0.30 or less. It is characterized by this.

[0017] (4) The fourth aspect of the present invention is the packaging body for a paper product according to (1), wherein the packaging base material has a three-layer structure including a layer of an opaque polyethylene film, and the layer of the opaque polyethylene film is provided in the innermost layer. It is characterized by this.

[0018] (5) The fifth aspect of the present invention is the packaging body for a paper product according to (1), wherein (the perimeter of the packaging base material / the perimeter of the tissue laminate) × 100 (%) is 101% or more and 113% or less.

[0019] (6) The sixth aspect of the present invention is the packaging body for a paper product according to (1), wherein the paper thickness of the tissue paper is 0.70 mm / 10 sheets or more and 1.08 mm / 10 sheets or less. It is characterized by this.

[0020] (7) The seventh aspect of the present invention is the package for paper products according to (1), wherein the basis weight per ply of the tissue paper is 10 g / m 2 or more and 18 g / m 2 or less.

[0021] (8) The eighth aspect of the present invention is the package for paper products according to (1), wherein the height of the tissue laminate is 15 mm or more and 110 mm or less.

[0022] (9) The ninth aspect of the present invention is the package for paper products according to (1), wherein the value calculated by ((the coefficient of static friction between the packaging base material and the tissue paper) × (the mass of the tissue laminate per bottom area of the tissue laminate) × 100) is 0.04 or more and 0.30 or less.

[0023] (10) The tenth aspect of the present invention is the package for paper products according to (1), wherein the value calculated by ((the coefficient of kinetic friction between the packaging base material and the tissue paper) × (the mass of the tissue laminate per bottom area of the tissue laminate) × 100) is 0.02 or more and 0.40 or less.

[0024] (11) The eleventh aspect of the present invention is the package for paper products according to (1), wherein the ash content of the packaging base material is 1.5% or more and 12% or less.

Advantages of the Invention

[0025] According to the present invention, even when a paper product, particularly a paper product such as laminated tissue paper, is used as an object to be packaged, a package for paper products that is easy to package, has excellent operability, and has good cosmetic properties of the paper product and the package after packaging can be provided.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0027] 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. In the specification, the MD direction and the CD direction respectively mean the manufacturing line direction (conveying direction) during the manufacture of the package for paper products and the direction orthogonal to the manufacturing line direction.

[0028] <Package for Paper Products> FIG. 1 is a perspective view showing an example of a package for paper products (hereinafter also simply referred to as "package") and a tissue laminate (hereinafter also simply referred to as "laminate") of the present invention. The package 1 of the present invention is a packaging base material 10 of a tube-shaped film, and a tissue laminate 11 in which tissue paper, which is a paper product, is laminated is covered, and the tissue laminate 11 is sealed by a seal portion 12. The seal portion 12 is preferably provided at the overlapping end of the packaging base material 10. 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 (adhesiveness of the seal portion 12) of the package 1 can be ensured, it may be formed at other locations.

[0029] Incidentally, it is preferable that the package 1 is provided with an outlet for taking out the tissue paper (not shown). The location of the outlet is not particularly limited as long as it is a place where the tissue paper can be easily pulled out from the package 1, but it is preferably provided at the center of the packaging base material 10 at the upper part of the tissue laminate 11 so as to extend substantially at a right angle to the seal part 12. Further, the packaging base material 10 may have a single-line perforation for forming an outlet for the tissue paper, and may be formed by cutting the perforation for opening at the time of use. By sequentially pulling out (taking out) the tissue paper from the formed outlet, the required number of tissue papers can be obtained.

[0030] (Packaging base material) The packaging base material 10 is a tubular film. Further, 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 ink for printing. Incidentally, the tubular film is a film formed by forming a sheet-like film into a cylindrical shape like a tube.

[0031] (Tubular film) The film constituting the tubular film preferably includes a layer of an opaque polyethylene film, and among them, it is preferable to have a layer of an opaque polyethylene film as the innermost layer. If the material of the innermost layer is other than the opaque polyethylene film, the friction between the packaging base material 10 and the tissue paper increases, making it difficult to package the tissue laminate 11 and resulting in poor operability. By making the innermost layer, that is, the surface in contact with the tissue laminate 11, a layer of an opaque polyethylene film, the friction is reduced, making it easier to package the tissue laminate 11 and resulting in good operability. Further, the tubular film may be formed as a single layer or a multi-layer, but is preferably a three-layer structure.

[0032] For the layers other than the innermost layer, the material of the film can be used without particular limitation as a plastic (thermoplastic resin) film that is used when packaging ordinary paper products, and surface treatment may be performed. However, from the viewpoints of cosmetic properties and anti-slip properties, it is preferably an opal polyethylene film among others. As the material of the plastic film, conventionally known thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyester (PET, etc.), polyamide (nylon, etc.), polycarbonate, polystyrene, polyvinyl chloride, etc. can be mentioned, and polyethylene is preferable.

[0033] As a specific configuration, when the tube-shaped film is formed in multiple layers, it is preferable that the material of the film in the outermost layer of the film base material is a matte polyethylene film, and the material in the innermost layer is an opal polyethylene film. When the outermost layer is a matte polyethylene film, the packaging base material 10 has appropriate strength and is easy to be tightly packaged.

[0034] In the matte polyethylene film which is the outermost layer of the tube-shaped film, the method of making the film matte is not particularly limited, and conventionally known methods such as a method of pressing the surface of the tube-shaped film against an embossing roll or a matte roll to give unevenness, or a method of giving unevenness by a sandblasting method can be adopted. These methods may be performed during the molding of the tube-shaped film, but it is preferable to perform them on a single layer of polyethylene to obtain a matte polyethylene film and then laminate it with the innermost layer opal polyethylene film or the like. Also, 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-based resin blend can also be adopted. Also, the tube-shaped film is preferably made into a multi-layer film by laminating (extrusion lamination) the outermost matte polyethylene film and the innermost layer opal polyethylene film.

[0035] In addition, the packaging base material 10 of the present invention may include other layers in addition to the tube-shaped film layer. 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, and the like. 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, and may be one layer or two or more layers. Note that the layers described above shall have no relation to the number of film layers. The printing layer is preferably provided between the outermost matte polyethylene film and the innermost milky white polyethylene film. By doing so, it becomes easier to package the tissue laminate 11 while maintaining a good touch of the film.

[0036] The basis weight of the packaging base material 10 is preferably 2 110 g / m 2 or less. If the basis weight is less than 20 g / m 2 , the packaging base materials 10 are too thin and stick to each other and do not open well, resulting in poor operability. If the basis weight exceeds 110 g / m 2 , the packaging base material 10 is too thick and difficult to bend, resulting in inferior operability. By setting the basis weight of the packaging base material 10 within the above numerical range, it becomes easier to package the tissue laminate 11 and the operability becomes good. Note that the lower limit of the basis weight of the packaging base material 10 is more preferably 2 50 g / m or more, and even more preferably 2 60 g / m or more. The upper limit is more preferably 2 80 g / m or less, and even more preferably 2 70 g / m or less. The basis weight of the packaging base material 10 can be measured in accordance with JIS P 8124.

[0037] Further, the thickness of the packaging base material 10 is 22 μm or more and 122 μm or less. If the thickness is less than 22 μm, the packaging base materials 10 are too thin and stick to each other, making it difficult to open properly and resulting in poor operability. If the thickness exceeds 122 μm, the packaging base material 10 is too thick and difficult to bend, resulting in inferior operability. By setting the thickness of the packaging base material 10 within the above numerical range, it becomes easier to package the tissue laminate 11 and the operability is good. In addition, the lower limit value of the thickness of the packaging base material 10 is preferably 55 μm or more, more preferably 67 μm or more. The upper limit value is preferably 89 μm or less, more preferably 78 μm or less. The thickness of the packaging base material 10 can be measured in accordance with JIS K7130.

[0038] Furthermore, the perimeter of the packaging base material 10 preferably has a lower limit value of 260 mm or more, more preferably 280 mm or more, and even more preferably 300 mm or more. The upper limit value is preferably 455 mm or less, more preferably 395 mm or less, and even more preferably 320 mm or less. If the perimeter is less than 260 mm, the packaging base material 10 is small, making it difficult to insert the tissue laminate 11 inside and resulting in inferior operability. Furthermore, the tissue paper is likely to wrinkle and the cosmetic property is also inferior. If the perimeter exceeds 455 mm, the packaging base material 10 is large, so the tissue laminate 11 is not stable inside the package 1, and the tissue paper is likely to wrinkle and the cosmetic property is inferior. In addition, the perimeter of the packaging base material 10 can be measured with a ruler after cutting the packaging base material 10. The perimeter of the packaging base material 10 is the direction along the CD direction of the film.

[0039] Moreover, the ash content of the packaging base material 10 is preferably 1.5% or more and 12% or less. If the ash content is less than 1.5%, the upper and lower parts of the tissue laminate 11 may curl during packaging, resulting in poor operability. If the ash content exceeds 12%, as the ash content increases, the stiffness of the packaging base material 10 weakens, making it difficult for the packaging base material 10 to expand when it is spread during packaging, and it is likely to rub against the tissue laminate 11, making the tissue paper easy to curl and wrinkle, resulting in poor cosmetic properties. Incidentally, 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% or less, and even more preferably 8.0% or less. The ash content refers to the proportion 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% is regarded as the absolute dry mass. Ash content (%) = mass of residue (g) ÷ absolute dry mass of test piece (g) × 100

[0040] Since only the printing ink cannot be removed from the film, the ash content of the packaging base material 10 is measured using the film including printing, and this value is regarded as the ash content of the packaging base material 10.

[0041] Furthermore, the content of titanium oxide contained in the ash of the packaging base material 10 is preferably 50% or more. If the content of titanium oxide is less than 50%, the laminate 11 becomes moderately difficult to slide on the packaging base material 10, and as a result, the upper and lower parts are likely to curl during packaging, resulting in poor operability. Incidentally, the content of titanium oxide contained in the ash of the packaging base material 10 is more preferably 55% or more, and even more preferably 60% or more. The content of titanium oxide can be measured by elemental analysis.

[0042] (Paper product) FIG. 2 is a perspective view showing an example of a tissue laminate 11 which is a paper product to be packaged in the package 1 of the present invention. The package 1 of the present invention can be suitably applied particularly for packaging soft paper products such as tissue paper. As the paper product, two-ply non-lotion-treated tissue paper is laminated. Since the paper product is a laminate of two-ply non-lotion-treated tissue paper, the friction with the packaging base material 10 is reduced, making it easier to package and resulting in good operability. Hereinafter, the tissue paper and the tissue laminate 11 will be described in detail.

[0043] (Tissue Paper) The basis weight per ply of the tissue paper is preferably 10 g / m 2 or more and 18 g / m 2 or less. If the basis weight is less than 10 g / m 2 , the height of the tissue laminate 11 becomes low, and a gap is formed between the packaging base material 10 and the laminate 11. As a result, the tissue paper bends due to instability and displacement inside, resulting in poor cosmetic appearance. If the basis weight exceeds 18 g / m 2 , the height of the tissue laminate 11 becomes high. Therefore, when the laminate 11 is inserted into the packaging base material 10, it is likely to wrinkle and has poor cosmetic appearance. Note that the lower limit value of the basis weight per ply of the tissue paper is more preferably 12 g / m 2 or more, and even more preferably 13 g / m 2 or more. The upper limit value is more preferably 17 g / m 2 or less, and even more preferably 16 g / m 2 or less. The basis weight per ply of the tissue paper is measured in accordance with JIS P 8124.

[0044] Also, the paper thickness of the tissue paper is preferably 0.70 mm / 10 sheets or more and 1.08 mm / 10 sheets or less. If the paper thickness is less than 0.70 mm / 10 sheets, the height of the tissue laminate 11 will be low, and a gap will be formed between the packaging base material 10 and the laminate 11. As a result, the tissue paper will bend due to instability and displacement inside, resulting in poor cosmetic appearance. If the paper thickness exceeds 1.08 mm / 10 sheets, the height of the tissue laminate 11 will be high. Therefore, when the laminate 11 is inserted into the packaging base material 10, it is likely to wrinkle and has poor cosmetic appearance. In addition, the lower limit value of the paper thickness of the tissue paper is more preferably 0.75 mm / 10 sheets or more, and even more preferably 0.80 mm / 10 sheets or more. The upper limit value is more preferably 1.02 mm / 10 sheets or less, and even more preferably 0.95 mm / 10 sheets or less.

[0045] The (10-sheet) paper thickness of the tissue paper 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. Place the sample between the measuring head and the measuring table, and read the gauge when the measuring head is lowered at a speed of 1 mm or less per second. When the tissue paper is 2-ply, stack 5 sets of 2-ply tissue paper to make 10 sheets, and calculate the measured value as the 10-sheet paper thickness. Also, repeat the measurement 10 times (measure 10 different locations instead of measuring the same location 10 times), and take the average of the measurement results as the final paper thickness.

[0046] Furthermore, the specific volume of the tissue paper preferably has a lower limit value of 4.1 cm 3 / g or more, more preferably 4.6 cm 3 / g or more, and even more preferably 5.3 cm 3 / g or more. The upper limit value is preferably 8.2 cm 3 / g or less, more preferably 7.5 cm 3 / g or less, and even more preferably 6.9 cm 3 / g or less. If the specific volume is 4.1 cm 3If it is less than / g, as a result, the mass of the laminate 11 is too large, and accordingly, the friction between the packaging base material 10 and the tissue paper increases, making it difficult to insert the laminate 11 into the packaging base material 10 and resulting in poor operability. Furthermore, the tissue paper of the laminate 11 bends and wrinkles, also resulting in poor cosmetic appearance. The specific volume is 8.2 cm 3 If it exceeds / g, as a result, the mass of the laminate 11 becomes small, and accordingly, the friction between the packaging base material 10 and the tissue paper decreases, making the laminate 11 unstable within the packaging base material 10 and making the tissue paper prone to wrinkling and resulting in poor cosmetic appearance. The specific volume of the tissue paper is obtained by dividing the paper thickness of the tissue paper by the basis weight, and is expressed as the volume cm per unit g. 3 It is represented by.

[0047] Furthermore, the kinetic friction coefficient between the packaging base material 10 and the tissue paper is 0.14 or more and 0.24 or less. If the kinetic friction coefficient is less than 0.14, the friction between the packaging base material 10 and the tissue paper is small, so the laminate 11 is unstable within the packaging base material 10 and the tissue paper is prone to wrinkling and has poor cosmetic appearance. If the kinetic friction coefficient exceeds 0.24, the friction between the packaging base material 10 and the tissue paper is large, so it is difficult to insert the laminate 11 into the packaging base material 10 and the operability is poor. Furthermore, the tissue paper of the laminate 11 bends and wrinkles, also resulting in poor cosmetic appearance. Note that the lower limit value of the kinetic friction coefficient between the packaging base material 10 and the tissue paper is preferably 0.16 or more, and more preferably 0.18 or more. The upper limit value is preferably 0.22 or less, and more preferably 0.20 or less.

[0048] Moreover, it is preferable that the static friction coefficient between the packaging base material 10 and the tissue paper is 0.20 or more and 0.30 or less. If the static friction coefficient is less than 0.20, the friction between the packaging base material 10 and the tissue paper is small, so the laminate 11 is not stable within the packaging base material 10, and the tissue paper is likely to wrinkle and is inferior in cosmetic appearance. If the static friction coefficient exceeds 0.30, the friction between the packaging base material 10 and the tissue paper is large, so it is difficult to insert the laminate 11 into the packaging base material 10, and the operability is inferior. Furthermore, the tissue paper of the laminate 11 is bent and wrinkled, and it is also inferior in cosmetic appearance. In addition, the lower limit value of the static friction coefficient between the packaging base material 10 and the tissue paper is more preferably 0.22 or more, and even more preferably 0.24 or more. The upper limit value is more preferably 0.28 or less, and even more preferably 0.26 or less.

[0049] The above-mentioned dynamic friction coefficient and static friction coefficient can be measured using the "Automatic Friction Tester NSF-100" manufactured by Nomura Shoji Co., Ltd. in accordance with ISO 15359. The friction coefficient is measured three times. In the present invention, the value of the first measurement is adopted for the static friction coefficient, and the value of the third measurement is adopted for the dynamic friction coefficient. Specifically, using the measuring device 200 shown in FIG. 4, the measurement is performed as follows.

[0050] First, the tissue laminate 11 is gently taken out from the paper product package 1. Next, a sample (packaging base material sample 110 which is a test piece) with a size of 16 cm in the long side direction × 6 cm in the short side direction (the long side direction is the MD direction of the packaging base material 10, and the short side direction is the CD direction of the packaging base material 10) is cut out from the packaging base material 10 of the package 1 and collected, and is attached to the upper surface of the table 201 of the measuring device 200 so that the inner surface (the surface in contact with the tissue laminate 11) of the packaging base material 10 becomes the measurement surface. Note that the packaging base material sample 110 may include perforations or the like on the bottom surface. In that case, the measurement is performed in a state including the perforations or the like.

[0051] Next, take one set of the 20th tissue paper from the bottom of the tissue laminate 11. If there are many wrinkles in the 20th tissue paper from the bottom, the tissue papers before and after the 20th (the 19th or 21st from the bottom) may be used. Make this one set (two sheets stacked) into the original folded state (a state of four sheets stacked). Then, cut out a sample (tissue sample 111 which is a test piece) of 16 cm × 6 cm (16 cm is the direction in which the tissue laminate 11 is inserted into the packaging substrate 10, and 6 cm is the direction perpendicular to this) so that no creases are included, and attach it to the lower surface of the thread 202. At this time, make it the same as the direction when the tissue laminate 11 is inserted into the packaging substrate 10 in the actual machine, and cut off both ends in the 16 cm direction so as not to affect the measurement.

[0052] Start the measurement. When the table 201 is moved with the packaging substrate sample 110 and the tissue sample 111 in contact, when the frictional force on the sample contact surface reaches the limit with respect to the moving amount of the table 201, the sample slips. Based on the value of the load cell 203 at this time, the static friction coefficient and the dynamic friction coefficient are derived. Note that the static friction coefficient and the dynamic friction coefficient are measured three times using the same sample, and the value of the first measurement is adopted for the static friction coefficient, and the value of the third measurement is adopted for the dynamic friction coefficient. Then, the measurement is repeated five times (one measurement for one package 1, and five measurements using five packages 1), and the average value is adopted.

[0053] (Tissue laminate) The folding method of the tissue paper included in the tissue laminate 11 is not particularly limited, but it is preferably V-folded and laminated. By being V-folded, the upper and lower parts of the laminate 11 can be made into a package 1 that is difficult to turn up during packaging. Also, it is preferably V-folded by an interfolder. When V-folded by an interfolder, when the tissue paper is pulled out from the package 1, the pulling direction becomes the MD direction of the tissue paper.

[0054] The height of the tissue laminate 11 is preferably 15 mm or more and 110 mm or less. If the height is less than 15 mm, the height of the tissue laminate 11 becomes low, and a gap is formed between the packaging base material 10 and the laminate 11. Therefore, the tissue paper bends due to instability and displacement inside, resulting in poor cosmetic appearance. If the height exceeds 110 mm, the height of the tissue laminate 11 becomes high. Therefore, when the laminate 11 is inserted into the packaging base material 10, it is likely to wrinkle and has poor cosmetic appearance. In addition, the lower limit value of the height of the tissue laminate 11 is more preferably 25 mm or more, and even more preferably 30 mm or more. The upper limit value is more preferably 80 mm or less, and even more preferably 50 mm or less. The height of the tissue laminate 11 is measured as follows. Cut the packaging base material 10 of the package 1 for paper products, gently take out the tissue laminate 11, and then place a 30 cm ruler (Straightedge Silver JIS Grade 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 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.

[0055] When the tissue paper is 2-ply, the number of sets of tissue paper contained in the tissue laminate 11 is 70 sets or more and 150 sets or less. If the number of sets is less than 70 sets, the height of the tissue laminate 11 becomes low, and a gap is formed between the packaging base material 10 and the laminate 11. Therefore, the tissue paper bends due to instability and displacement inside, resulting in poor cosmetic appearance. If the number of sets exceeds 150 sets, the height of the tissue laminate 11 becomes high. Therefore, when the laminate 11 is inserted into the packaging base material 10, it is likely to wrinkle and has poor cosmetic appearance. In addition, the lower limit value of the number of sets of tissue paper contained in the tissue laminate 11 is preferably 80 sets or more, and more preferably 90 sets or more. The upper limit value is preferably 140 sets or less, and more preferably 120 sets or less.

[0056] Furthermore, the perimeter of the tissue laminate 11 preferably has a lower limit value of 240 mm or more, more preferably 260 mm or more, and even more preferably 280 mm or more. The upper limit value is preferably 435 mm or less, more preferably 375 mm or less, and even more preferably 300 mm or less. If the perimeter is less than 240 mm, since the laminate 11 is small, it is not stable inside the package 1, and the tissue paper is likely to wrinkle and the cosmetically appealing property is poor. If the perimeter exceeds 435 mm, since the laminate 11 is large, it is difficult to insert it inside the packaging substrate 10, and the operability is poor. Furthermore, the tissue paper is likely to wrinkle and the cosmetically appealing property is also poor. The perimeter of the tissue laminate 11 is measured as follows. Cut the packaging substrate 10 of the package 1 for paper products, and gently take out the tissue laminate 11. Place a 30 cm ruler (Straightedge Silver JIS 1st grade, 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 of the top surface portion and the heights at both ends of the laminate 11. The sum of the numerical values of the length of the top surface portion × 2 + the two points of the heights at both ends is taken as the final perimeter of the tissue laminate 11.

[0057] And the ratio calculated by (perimeter of the packaging substrate 10 / perimeter of the tissue laminate 11) × 100 (%) is preferably 101% or more and 113% or less. If the ratio is less than 101%, since the packaging substrate 10 is small, it is difficult to insert the laminate 11 inside, and the operability is poor. Furthermore, the tissue paper is likely to wrinkle and the cosmetically appealing property is also poor. If the ratio exceeds 113%, since the packaging substrate 10 is large, the laminate 11 is not stable inside, and the tissue paper is likely to wrinkle and the cosmetically appealing property is poor. In addition, the lower limit value of the ratio calculated by (perimeter of the packaging substrate 10 / perimeter of the tissue laminate 11) × 100 (%) is more preferably 103% or more, and even more preferably 107% or more. The upper limit value is more preferably 111% or less, and even more preferably 110% or less.

[0058] Also, the mass of the tissue laminate 11 is 45 g or more and 175 g or less. If the mass is less than 45 g, the friction between the packaging base material 10 and the tissue paper will be small as a result, and the tissue laminate 11 will not be stable within the packaging base material 10, and the tissue paper will be prone to wrinkling and inferior in cosmetic appearance. If the mass exceeds 175 g, the friction between the packaging base material 10 and the tissue paper will be large as a result, making it difficult to insert the laminate 11 into the packaging base material 10 and inferior in workability. Furthermore, the tissue paper of the laminate 11 will bend and wrinkle, and it is also inferior in cosmetic appearance. In addition, the lower limit value of the mass of the tissue laminate 11 is more preferably 60 g or more, and even more preferably 80 g or more. The upper limit value is more preferably 155 g or less, and even more preferably 105 g or less.

[0059] The mass of the tissue laminate 11 is measured with an electronic balance after conditioning at 23°C and 50% humidity after collecting the tissue laminate 11 from the paper product package 1. Also, the mass of the laminate 11 in this case is the mass when the laminate 11 has a long side of 150 mm and a short side of 107 mm. When the lengths of each side are different, the mass in the case of a long side of 150 mm and a short side of 107 mm is obtained by proportional calculation.

[0060] In addition, it is preferable that the value calculated by ((the static friction coefficient between the packaging base material 10 and the tissue paper) × (the mass of the tissue laminate 11 per unit bottom area of the tissue laminate 11) × 100) is 0.04 or more and 0.30 or less. If the value is less than 0.04, the friction between the packaging base material 10 and the tissue paper is small, so the laminate 11 is not stable within the packaging base material 10, and the tissue paper is prone to wrinkling and inferior in cosmetic appearance. If the value exceeds 0.30, the friction between the packaging base material 10 and the tissue paper is large, so it is difficult to insert the laminate 11 into the packaging base material 10 and inferior in workability. Furthermore, the tissue paper of the laminate 11 bends and wrinkles, and it is also inferior in cosmetic appearance. The value calculated by ((Coefficient of static friction between the packaging base material 10 and the tissue paper) × (Mass of the tissue laminate 11 per bottom area of the tissue laminate 11) × 100) preferably has a lower limit of 0.08 or more, more preferably 0.10 or more. The upper limit is more preferably 0.25 or less, and even more preferably 0.20 or less.

[0061] Also, the value calculated by ((Coefficient of kinetic friction between the packaging base material 10 and the tissue paper) × (Mass of the tissue laminate 11 per bottom area of the tissue laminate 11) × 100) is preferably 0.02 or more and 0.40 or less. If the value is less than 0.02, the friction between the packaging base material 10 and the tissue paper is small, so the laminate 11 is not stable in the packaging base material 10, and the tissue paper is likely to wrinkle and is inferior in cosmetic appearance. If the value exceeds 0.40, the friction between the packaging base material 10 and the tissue paper is large, so it is difficult to insert the laminate 11 into the packaging base material 10, and the operability is inferior. Furthermore, the tissue paper of the laminate 11 is bent and wrinkled, and it is also inferior in cosmetic appearance. The value calculated by ((Coefficient of kinetic friction between the packaging base material 10 and the tissue paper) × (Mass of the tissue laminate 11 per bottom area of the tissue laminate 11) × 100) preferably has a lower limit of 0.04 or more, more preferably 0.06 or more. The upper limit is more preferably 0.30 or less, and even more preferably 0.25 or less.

[0062] Incidentally, the mass of the tissue laminate 11 per bottom area of the tissue laminate 11 is obtained by dividing the mass of the laminate 11 described above by the bottom area after obtaining the bottom area of the tissue laminate 11 by the dimension in the longitudinal direction of the tissue laminate 11 × the dimension in the width direction of the tissue laminate 11.

[0063] Furthermore, the density of the tissue laminate 11 is 0.10 g / cm 3 or more and 0.24 g / cm 3 or less. If the density is 0.10 g / cm 3If it is less than this value, the friction between the packaging base material 10 and the tissue paper will be reduced as a result, the tissue laminate 11 will not be stable within the packaging base material 10, the tissue paper will be prone to wrinkling, and the cosmetic property will be inferior. The density is 0.24 g / cm 3 If it exceeds this value, the friction between the packaging base material 10 and the tissue paper will increase as a result, it will be difficult to insert the laminate 11 into the packaging base material 10, and the operability will be inferior. Furthermore, the tissue paper will bend and wrinkle, and the cosmetic property will also be inferior. Note that the density of the tissue laminate 11 preferably has a lower limit value of 0.11 g / cm 3 or more, and more preferably 0.13 g / cm 3 or more. The upper limit value is preferably 0.22 g / cm 3 or less, and more preferably 0.17 g / cm 3 or less.

[0064] The density of the tissue laminate 11 is measured as follows. First, the tissue laminate 11 is sampled 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% humidity. Then, the size (short side, long side, height (length of the paper product)) of the tissue laminate 11 is measured with a ruler, and the height is adopted as it is, but the short side and the long side are set to 107 mm and 150 mm respectively (if the measured values of the short side and / or the long side are different, the mass value is adjusted by performing proportional calculation on the mass of the tissue laminate 11 described above). Finally, the density of the tissue laminate 11 is calculated by the following formula. Density of the tissue laminate 11 (g / cm 3 ) = Mass of the tissue laminate 11 (g) / (Short side of the tissue laminate 11 (10.7 cm) × Long side of the tissue laminate 11 (15 cm) × Height of the tissue laminate 11 (cm))

[0065] (Packaging form) The packaging form of the package 1 for paper products according to the present invention is a gusset packaging.

[0066] The gusset packaging is formed in a cylindrical shape as shown in Figure 3, with the bottom or both ends of the mouth part woven inside as mountain folds according to the length (height) of the bag. The article to be packaged (laminated body 11) is inserted through the insertion port 13 inside the packaging base material 10 that is sealed at one side by the seal part 12, and then sealed in a horizontal row by heat sealing or the like. This gusset packaging is cut into individual bags at the sealed part. This gusset packaging can be carried out using known devices. Also, the laminated body 11 may be inserted with the packaging base material 10 at the insertion port 13 inverted to the outside so as not to be rolled inside.

[0067] As described above, the present invention has been described using the 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

[0068] 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.

[0069] <Example 1> (Packaging base material) A film with a multi-layer (three-layer) structure as the film base material (the outermost layer is a matte polyethylene film, the innermost layer is an opalescent polyethylene film, and these are adhered by extrusion lamination) was prepared and used as the packaging base material as it was. The film was printed. Table 1 shows the results of measuring the basis weight and thickness of the packaging base material.

[0070] (Tissue paper package (gusset package)) As a packaging substrate, packaging was carried out using a film with a perimeter of 308 mm (CD direction, front width 105 mm, folding width 24.5 mm each) × pitch 245 mm (MD direction). A tissue laminate in which 101 sets of tissue papers were laminated was placed in this film which is the packaging substrate, 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). Further, after inserting the tissue laminate, the excess in the pitch direction was cut to produce a package. Then, in the tissue paper package, the perimeter (A) of the packaging substrate and the perimeter (B) of the tissue laminate were measured before packaging, and A / B×100 was calculated from the measured A and B to calculate the ratio of A to B (A / B (%))

[0071] (Operability) Regarding the produced tissue paper package, the operability during packaging was evaluated. The evaluation criteria are as follows. 5: During packaging, the laminate was hardly caught in the insertion port or the sheet was hardly turned up, and packaging could be carried out very smoothly 4: During packaging, the laminate was slightly caught in the insertion port or the sheet was slightly turned up, but packaging could be carried out smoothly 3: During packaging, the laminate was somewhat caught in the insertion port or the sheet was somewhat turned up, but packaging could be carried out 2: During packaging, the laminate was caught in the insertion port or the sheet was turned up, but it was within an acceptable range 1: During packaging, the laminate was caught in the insertion port many times or the sheet was turned up many times, resulting in poor operability

[0072] (Cosmetic appearance) Regarding the produced tissue paper package, the cosmetic appearance of the package was evaluated by 30 monitors in two choices: "both the tissue laminate and the package are excellent in cosmetic appearance" and "one or both of the tissue laminate and the package are inferior in cosmetic appearance". The evaluation criteria are as follows. 5: 29 or more monitors evaluated that both the laminate and the package are excellent in cosmetic appearance 4: The number of monitors who evaluated that both the laminate and the package were excellent in cosmetic properties was 27 or more and 28 or less 3: The number of monitors who evaluated that both the laminate and the package were excellent in cosmetic properties was 25 or more and 26 or less 2: The number of monitors who evaluated that both the laminate and the package were excellent in cosmetic properties was 22 or more and 24 or less 1: The number of monitors who evaluated that both the laminate and the package were excellent in cosmetic properties was 21 or less

[0073] (Example 2) to (Example 18), (Comparative Example 1) to (Comparative Example 8) In the same manner as in Example 1, packaging base materials having the physical properties shown in Tables 1 and 2 were produced for Examples 2 to 18 and Comparative Examples 1 to 8. Using these, in the same manner as in Example 1, a tissue paper package (gusset package) was produced, and the operability and cosmetic properties were evaluated.

[0074]

Table 1

[0075]

Table 2

[0076] As is clear from the results shown in Tables 1 and 2, all of the packages of Examples 1 to 18 had good operability and were excellent in cosmetic properties. On the other hand, all of Comparative Examples 1 to 8 had poor operability and / or were inferior in cosmetic properties. 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 package, has excellent operability, and has good cosmetic properties of the paper products and the package after packaging, even when the paper product is a laminated thin paper or the like and is used as an object to be packaged.

Explanation of Reference Numerals

[0077] 1 Package for (paper products) 10 Packaging base material 11 (Tissue) laminate 12 Sealing part 13 Insertion port 110 Packaging substrate sample 111 Tissue sample 200 Measuring device 201 Table 202 Thread 203 Load cell

Claims

1. A package for a paper product, which is a packaging substrate in the form of a tubular film, with a paper product covered and sealed by a sealing portion, wherein: The packaging form by the packaging substrate is a gusset packaging; The thickness of the packaging substrate is 22 μm or more and 122 μm or less; The paper product is a tissue laminate obtained by laminating 70 to 150 sets of non-two-ply lotion-processed tissue papers; The mass of the tissue laminate is 45 g or more and 175 g or less, and the density is 0.10 g / cm ３ or more and 0.24 g / cm ３ or less, and A package for a paper product, characterized in that the coefficient of kinetic friction between the packaging substrate and the tissue paper is 0.14 or more and 0.24 or less.

2. The basis weight of the packaging base material is 20 g / m ２ or more and 110 g / m ２ or less, and the package for a paper product according to claim 1, characterized in that.

3. The package for a paper product according to Claim 1, characterized in that the coefficient of static friction between the packaging substrate and the tissue paper is 0.20 or more and 0.30 or less.

4. The package for a paper product according to Claim 1, characterized in that the packaging substrate has a three-layer structure including a layer of an opalescent polyethylene film, and the layer of the opalescent polyethylene film is provided in the innermost layer.

5. The package for a paper product according to Claim 1, wherein (perimeter of the packaging substrate / perimeter of the tissue laminate) × 100 (%) is 101% or more and 113% or less.

6. The package for a paper product according to Claim 1, characterized in that the paper thickness of the tissue paper is 0.70 mm / 10 sheets or more and 1.08 mm / 10 sheets or less.

7. The basis weight per ply of the tissue paper is 10 g / m ２ or more and 18 g / m ２ or less, and the package for the paper product according to claim 1, characterized in that.

8. The package for a paper product according to Claim 1, characterized in that the height of the tissue laminate is 15 mm or more and 110 mm or less.

9. The package for a paper product according to Claim 1, characterized in that the value calculated by ((coefficient of static friction between the packaging substrate and the tissue paper) × (mass of the tissue laminate per unit bottom area of the tissue laminate) × 100) is 0.04 or more and 0.30 or less.

10. The package for a paper product according to Claim 1, characterized in that the value calculated by ((coefficient of kinetic friction between the packaging substrate and the tissue paper) × (mass of the tissue laminate per unit bottom area of the tissue laminate) × 100) is 0.02 or more and 0.40 or less.

11. The package for a paper product according to Claim 1, characterized in that the ash content of the packaging substrate is 1.5% or more and 12% or less.

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