Packaging paper, paper bag packaging, and package

Abstract

Provided is a packaging paper is for packaging an object to be packaged, having a basis weight of 32 g / m2-55 g / m2, wherein a plurality of first folding lines and / or a plurality of second folding lines are formed. The plurality of first folding lines extend along an MD direction of the packaging paper and are arranged in an CD direction of the packaging paper, and the plurality of second folding lines extend along the CD direction and are arranged in the MD direction.

Description

Wrapping paper, paper packaging bags, and packaging bodies

[0001] This disclosure relates to packaging paper, paper packaging bags, and packaging bodies.

[0002] Packaging for sheets such as tissue paper is known in which multiple sheets are contained in a resin film packaging bag with perforations for opening (for example, Patent Documents 1 and 2). In addition, in order to reduce the amount of plastic used, packaging for paper products is known in which laminated tissue paper is covered with a packaging material containing a paper base, and perforations are provided in the packaging material to form an opening for removing the product (for example, Patent Document 3).

[0003] Japanese Patent Publication No. 2008-183034, Japanese Patent Publication No. 2018-177364, Japanese Patent Publication No. 2022-57523

[0004] In recent years, from the perspective of reducing environmental impact, it is desirable to use wrapping paper made solely of paper for packaging bags that wrap items such as sheets. However, when wrapping items with wrapping paper, there are problems such as the wrapping paper being difficult to fold, the wrapping paper tearing during packaging, or the packaging becoming unstable.

[0005] The objective of this disclosure is to provide packaging paper that is easy to fold when packaging the object to be packaged.

[0006] A packaging paper relating to one aspect of this disclosure is a packaging paper for packaging an object to be packaged, and has a basis weight of 32 g / m². ２ 55g / m or more ２ The following is a wrapping paper having a plurality of first fold lines and / or a plurality of second fold lines, wherein the plurality of first fold lines extend along the MD direction of the wrapping paper and are aligned in the CD direction of the wrapping paper, and the plurality of second fold lines extend along the CD direction and are aligned in the MD direction.

[0007] According to one aspect of the disclosed invention, it is possible to provide packaging paper that is easy to fold when packaging an object to be packaged.

[0008] This figure shows a sheet packaging in which a sheet laminate is housed in a paper packaging bag made of the packaging paper of the embodiment. This figure shows a sheet laminate housed in a paper packaging bag. This is a view of the packaging of Figure 1 from the front. This is a view of the packaging of Figure 1 from one side. This is a view of the packaging of Figure 1 from the other side. This figure shows the packaging paper of the embodiment. This is an enlarged view of a part of Figure 6. This figure shows packaging paper with fold lines formed in directions oblique to the MD and CD directions. This is an enlarged view of a part of Figure 8.

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. Parts common to all drawings may be denoted by the same reference numerals and their descriptions may be omitted. Furthermore, the scale of each component in each drawing may differ from that of the actual components.

[0010] In this specification, the directions in the figures are described using a three-dimensional Cartesian coordinate system with three axes (X, Y, and Z directions). In each figure, the left-right direction (the longitudinal direction of the sheet stack, paper packaging bag, or packaging) is the X direction, the front-back direction (the short direction of the sheet stack, paper packaging bag, or packaging) is the Y direction, and the up-down direction (the height direction of the sheet stack, paper packaging bag, or packaging) is the Z direction.

[0011] Furthermore, in this specification, deviations in each direction are permitted to the extent that they do not impair the function and effect of the embodiment. Note that parallel and orthogonal directions may include substantially parallel and substantially orthogonal directions. <Packaging>

[0012] Figure 1 shows a package in which a sheet laminate is housed in a paper packaging bag made of the packaging paper of the embodiment, and Figure 2 shows the sheet laminate housed in the paper packaging bag. Figure 3 shows the package in Figure 1 viewed from the front, Figure 4 shows the package in Figure 1 viewed from one side, and Figure 5 shows the package in Figure 1 viewed from the other side.

[0013] The packaging body 100 comprises an object to be packaged and a paper packaging bag 10 for containing the object to be packaged.

[0014] The packaged object is not particularly limited. In this embodiment, a sheet laminate SL is packaged in a paper packaging bag 10 as an example of the packaged object. As shown in Figure 2, the sheet laminate SL consists of multiple sheets S stacked in the stacking direction SD. The sheet laminate SL is designed so that the sheets S can be pulled out one by one or one by one through an opening 20 formed in the paper packaging bag 10.

[0015] The form of the sheet laminate SL is not particularly limited, and for example, sheets S can be laminated in a folded state, sheets S can be laminated alternately in a folded state (a so-called pop-up type sheet laminate), or multiple sheets S can be simply laminated.

[0016] Furthermore, the dimensions of the sheet S (sheet laminate SL) can be such that the length in the longitudinal direction (X direction) of the paper packaging bag 10 is approximately 150 to 250 mm, the width in the width direction (Y direction) perpendicular to the longitudinal direction (X direction) of the paper packaging bag 10 is approximately 70 to 150 mm, and the height in the height direction (Z direction) is approximately 20 to 100 mm. Such a sheet laminate can be manufactured, for example, by a rotary type or multi-stand type interfolder.

[0017] The form of sheet S is not particularly limited and can be applied to, for example, sanitary tissues such as tissue paper, paper towels, kitchen paper, and toilet paper. These sanitary tissues also include sanitary tissues containing moisturizing ingredients (for example, lotion tissues). These sanitary tissues are just examples of sheet-type sanitary tissues.

[0018] Furthermore, the use of sheet S is not particularly limited and can be applied to industrial, household, or portable use. Among these, household or portable tissue paper is preferably used as the sheet in this embodiment.

[0019] The number of plies of the sheet S is not particularly limited, but it can be one ply or more, preferably one ply or two plies (two sheets stacked). Also, the shape of the sheet S is not particularly limited, but for example, it is preferable that the contour shape is a quadrilateral (rectangle, square, etc.) when a single-ply sheet is folded.

[0020] The material of the sheet S is not particularly limited, but for example, sheets such as paper, non-woven fabric, or cloth can be used, and preferably paper (paper sheet). When the sheet S is a paper sheet, a base paper mainly made of pulp is used. A known composition in paper sheets can be used for the pulp composition. For example, the blending ratio of pulp can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0021] Also, the pulp composition of the paper sheet used for the sheet S is not particularly limited. For example, softwood pulp such as NBKP (needlewood kraft pulp) and NUKP (needlewood unbleached pulp), and hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp) can be used in any ratio.

[0022] In the case of a paper sheet, the ratio of hardwood pulp to softwood pulp is not limited, but is preferably 90:10 to 20:80, and more preferably a pulp composition in which the ratio of hardwood pulp to softwood pulp is higher. Also, wastepaper pulp may be used for the pulp contained in the paper sheet.

[0023] The basis weight of the sheet S is not particularly limited, but depending on the number of plies, in the case of paper, it is 5 g / m ２ or more and 80 g / m ２ or less, preferably 10 g / m ２ or more and 60 g / m ２ or less, more preferably 10 g / m ２ or more and 45 g / m ２ or less. Also, in the case of non-woven fabric, those of 20 g / m ２ or more and 100 g / m ２ or less are desirable. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0024] Also, the thickness of the paper sheet is not particularly limited, and the paper thickness measured in accordance with the provisions of JIS P 8111 (1998) can be adopted. For example, when the sheet S is paper, the paper thickness is 50 μm or more and 800 μm or less per ply, preferably 60 μm or more and 700 μm or less, more preferably 70 μm or more and 500 μm or less.

[0025] Also, the paper sheet used for the sheet S may be embossed. Such embossing can be carried out by a known embossing method. The embossing method is not particularly limited, and examples include a steel rubber method, a steel match method, and the like.

[0026] <Wrapping paper and paper packaging body> FIG. 6 is a diagram showing the wrapping paper of the embodiment, and FIG. 7 is an enlarged view of a part of FIG. 6. The paper packaging bag 10 is composed of the wrapping paper B. That is, the wrapping paper B is a wrapping paper for wrapping the object to be wrapped (in this embodiment, the sheet laminate SL).

[0027] The wrapping paper B is made of paper. The paper constituting the wrapping paper B is, for example, a material obtained by adhering plant fibers (pulp). The pulp composition of the paper in the wrapping paper B is not limited. For example, the ratio of hardwood pulp to softwood pulp is 0:100 to 70:30, and preferably the ratio of softwood pulp to hardwood pulp is higher. Also, wastepaper pulp may be used for the pulp.

[0028] The ratio of the paper in the wrapping paper B is 50% or more, preferably 70% or more, and more preferably 100%.

[0029] The type of the wrapping paper B is not particularly limited. For example, wrapping paper can be applied. The wrapping paper is further classified into unbleached wrapping paper or bleached wrapping paper.

[0030] Examples of the unbleached wrapping paper include double-reed unbleached kraft paper, ribbed kraft paper, and single-sided unbleached kraft paper.

[0031] Examples of bleached wrapping paper include pure white roll paper, double-sided bleached kraft paper, single-sided glossy bleached kraft paper, and thin imitation paper.

[0032] For wrapping paper B, double-sided kraft paper is preferred, and unbleached wrapping paper is preferred.

[0033] The basis weight of wrapping paper B is 32 g / m². ２ 55g / m or more ２ The following is preferable: 33 g / m² ２ 53g / m or more ２ The following is more preferable: 35 g / m ２ 51g / m or more ２ The following applies. Note that the basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0034] The thickness of wrapping paper B is not limited, but is, for example, 50 μm or more and 85 μm or less, more preferably 52 μm or more and 83 μm or less, and even more preferably 54 μm or more and 80 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014). If a fold line is formed as described later, the thickness of wrapping paper B refers to the thickness of the wrapping paper after the fold line is formed.

[0035] In this embodiment, the wrapping paper B has a plurality of first fold lines B1 and / or a plurality of second fold lines B2 formed on it. That is, the wrapping paper B may have only a plurality of first fold lines B1, only a plurality of second fold lines B2, or a plurality of first fold lines B1 and a plurality of second fold lines B2.

[0036] In this specification, a crease refers to a line or fold made on the surface of wrapping paper to make it easier to partially fold the wrapping paper. The crease may be either a mountain fold or a valley fold.

[0037] Multiple first fold lines B1 extend along the MD direction of the packaging paper B and are aligned in the CD direction of the packaging paper B. In this disclosure, the multiple first fold lines B1 are arranged parallel to each other (see Figures 6 and 7). Here, the MD direction refers to the flow direction during the manufacturing of the packaging paper B (also called the machine direction, transport direction, or longitudinal direction), and the CD direction refers to the direction perpendicular to the MD direction (also called the transverse direction).

[0038] The width of the multiple first fold lines B1 is not particularly limited, but is, for example, 0.1 mm or more and 2 mm or less, preferably 0.5 mm or more and 1.5 mm or less, and more preferably 0.8 mm or more and 1.3 mm or less.

[0039] The spacing d1 between each first fold line B1 is not particularly limited, but is, for example, 0.5 mm or more and 5 mm or less, preferably 1 mm or more and 4 mm or less, and more preferably 1.5 mm or more and 3 mm or less.

[0040] The depth of the multiple first fold lines B1 is not particularly limited, but is, for example, 0.01 mm or more and 1 mm or less, preferably 0.05 mm or more and 0.5 mm or less, and more preferably 0.1 mm or more and 0.3 mm or less.

[0041] Multiple second fold lines B2 extend along the CD direction of the wrapping paper B and are aligned along the MD direction of the wrapping paper B. That is, multiple second fold lines B2 are arranged perpendicular to multiple first fold lines B1. In this disclosure, multiple first fold lines B1 are arranged parallel to each other (see Figures 6 and 7).

[0042] The width of the multiple second fold lines B2 is not particularly limited, but is, for example, 0.1 mm or more and 2 mm or less, preferably 0.5 mm or more and 1.5 mm or less, and more preferably 0.8 mm or more and 1.3 mm or less.

[0043] The spacing d2 between each second fold line B2 is not particularly limited, but is, for example, 0.5 mm or more and 5 mm or less, preferably 1 mm or more and 4 mm or less, and more preferably 1.5 mm or more and 3 mm or less.

[0044] The depth of the multiple second fold lines B2 is not particularly limited, but is, for example, 0.01 mm or more and 1 mm or less, preferably 0.05 mm or more and 0.5 mm or less, and more preferably 0.1 mm or more and 0.3 mm or less.

[0045] The shape of the creases constituting the first crease B1 and the second crease B2 is not particularly limited, but it is preferable that they are formed by embossing and / or creasing.

[0046] Embossing is a processing method that creates a raised or recessed pattern on the surface of wrapping paper B by pressing a mold against it. Embossing can be carried out by known embossing methods. The embossing method is not particularly limited and examples include the steel rubber method and the steel match method.

[0047] The fold lines formed by embossing are formed between the raised areas created by the embossing. The shape of the embossing is not particularly limited and can be circular, square, rectangular, etc. When the shape of the embossing is circular or square, the first fold line B1 and the second fold line B2 can be formed simultaneously. When the shape of the embossing is an elongated rectangle, the first fold line B1 and the second fold line B2 can be formed separately.

[0048] The creasing process is a method of making wrapping paper B easier to fold by creating creases in it. The creasing process can be carried out using known creasing methods. The creasing lines formed by the creasing process directly constitute the creases.

[0049] The shape of the paper packaging bag 10 is not particularly limited, but it is approximately a rectangular parallelepiped when the sheet laminate SL is contained within the paper packaging bag 10. Such an approximately rectangular parallelepiped paper packaging bag 10 has a top surface 11, a bottom surface 12, a front surface 13, a back surface 14, and two sides 15 and 16. In the paper packaging bag 10, as shown in Figures 1, 3, 4, and 5, the top surface 11 and the bottom surface 12 face each other in the vertical direction (Z direction), the front surface 13 and the back surface 14 face each other in the width direction (Y direction), and the two sides 15 and 16 face each other in the longitudinal direction (X direction). Also, the sides 15 and 16 are continuous with any of the top surface 11, bottom surface 12, front surface 13, and back surface 14.

[0050] The dimensions of the paper packaging bag 10 are not particularly limited. For example, the length in the longitudinal direction (X direction) of the paper packaging bag 10 can be about 150 to 250 mm, the length in the transverse direction (Y direction) perpendicular to the longitudinal direction (X direction) can be about 70 to 150 mm, and the height in the height direction (Z direction) can be about 20 to 100 mm. Note that the dimensions of the paper packaging bag 10 are those when the sheet laminate SL is contained in the paper packaging bag 10, as shown in Figures 1 and 2.

[0051] The packaging form of the paper packaging bag 10 can be, for example, as shown in Figure 3, a paper base material 10 having a predetermined length, with its edges 10A and 10B joined together to form a cylindrical shape, and the open end of the cylindrical paper base material sealed (pillow packaging), a cylindrical paper base material with both ends folded and sealed (caramel packaging), or a combination of these. In the case of pillow packaging, the cylindrical paper base material may be folded into a gusset shape.

[0052] As for the packaging form of the paper packaging bag 10, caramel packaging is preferred. Specifically, as shown in Figures 1, 4, and 5, the seal portion 30 on the front 13 of the paper packaging bag 10 is bonded (front seal), and the seal portions 40 and 50 on the sides 15 and 16 of the paper packaging bag 10 are folded and bonded (side seal), thereby caramel-packaging the sheet laminate SL in the paper packaging bag 10.

[0053] The seal is formed by coating a paper substrate with a heat-sealing material and heating it. The components of the heat-sealing material are not particularly limited, but include, for example, polyethylene resins, polypropylene resins, and alkali-neutralized ethylene (meth)acrylic acid copolymers.

[0054] Alternatively, the seal portion may be bonded using a hot melt adhesive.

[0055] Examples of polyethylene resins include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA), carboxylic acid-modified polyethylene, styrene-acrylic acid, styrene-butadiene latex and their derivatives, as well as mixtures thereof.

[0056] Examples of polypropylene resins include polypropylene (PP) homopolymer, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, carboxylic acid-modified polypropylene, derivatives thereof, and mixtures thereof.

[0057] Examples of alkali-neutralized ethylene (meth)acrylic acid copolymers include those obtained by neutralizing the carboxyl groups of acrylic acid in an aqueous dispersion of ethylene (meth)acrylic acid copolymer resin with ammonia while heating and stirring in water.

[0058] Other additives may be incorporated into the heat seal material. Examples of other additives include water-soluble polymers, adhesives, inorganic pigments, organic pigments, sizing agents, viscosity modifiers, coloring dyes, coloring pigments, water-resistant agents, lubricants, etc., either individually or in combination.

[0059] The coating method for the heat seal material is not particularly limited, and known coating methods can be used. For example, known coating machines or printing machines such as two-roll size press coaters, gate roll coaters, blade metering coaters, rod metering coaters, blade coaters, air knife coaters, roll coaters, brush coaters, kiss coaters, squeeze coaters, curtain coaters, die coaters, bar coaters, gravure coaters, and flexo coaters can be used for coating the heat seal material.

[0060] The coating amount of the heat sealant (based on solid content) is 1 g / m². ２ 50g / m or more ２ The following is preferable: 2 g / m ２ 30g / m or more ２The following is more preferable: 3 g / m ２ 15g / m or more ２ The following is even more preferable: 5 g / m ２ 10g / m or more ２ The following is particularly preferable: The coating amount of the heat sealant is 1 g / m². ２ If the amount is less than 50 g / m², it may not have sufficient heat seal strength, and the bag may not be properly sealed. ２ If this value is exceeded, the blocking suppression ability of the heat-sealed surface of the paper substrate will decrease, which may make it less slippery and more prone to tearing during the bag-making process, and may also prevent sufficient reduction in the amount of plastic used.

[0061] An opening 20 is formed on the top surface 11 of the paper packaging bag 10. The opening 20 is an opening for pulling out the sheets S of the sheet laminate SL from the paper packaging bag 10. The opening 20 is formed on the top surface 11 of the paper packaging bag 10 when the tearing line M provided on the top surface 11 is torn. The tearing line M is, for example, a perforation. The perforation is an intermittent cut line in which cuts and ties (uncut portions between two cuts) are arranged alternately, and when a tie breaks, the cuts on both sides become continuous cuts.

[0062] In the perforations, the length of the cut and the length of the tie are arbitrary. In the perforations, the length of the cut can be 1 mm or more and 19 mm or less, preferably 5 mm or more and 17 mm or less, and more preferably 10 mm or more and 15 mm or less. The length of the tie can be 0.3 mm or more and 1.2 mm or less, preferably 0.4 mm or more and 1.1 mm or less, and more preferably 0.5 mm or more and 1.0 mm or less.

[0063] The shape of the opening constituting the outlet 20 is not particularly limited, and for example, it may have a shape that extends in one direction when viewed from above. Furthermore, the shape that extends in one direction is not limited to a straight line, and may be an elongated rectangle, an ellipse, a racetrack shape (hereinafter referred to as the track shape), a gourd shape (or dumbbell shape), etc. Here, the gourd shape (or dumbbell shape) refers to a shape in which the central part of the ellipse is constricted. Among these, the straight line, ellipse, track shape, and gourd shape (or dumbbell shape) are preferred, and the straight line and track shape are more preferred.

[0064] The length of the outlet 20 in the longitudinal direction (X direction) is not particularly limited, and for example, it is 40% to 100% of the length of the top surface 11 of the paper packaging bag 10 in the longitudinal direction (X direction), preferably 45% to 90%, and more preferably 50% to 80%.

[0065] Furthermore, the length of the short side (Y direction) of the dispensing opening 20 is preferably 0.1% to 45% of the length of the short side (Y direction) of the top surface 11 of the paper packaging bag 10, more preferably 0.1% to 30%, and even more preferably 0.1% to 15%.

[0066] In this embodiment, as described above, the basis weight is 32 g / m². ２ 55g / m or more ２ By providing the following wrapping paper B with a first fold line B1 extending along the MD direction and aligned in the CD direction, and / or a second fold line B2 extending along the CD direction and aligned in the MD direction, a wrapping paper B that is easy to fold when wrapping an object is obtained. When an object is wrapped with such wrapping paper B, the wrapping paper B is less likely to tear when the object is wrapped, and the wrapped state of the object is stabilized.

[0067] Furthermore, in this embodiment, as described above, by forming fold lines B1 and B2 by embossing and / or creasing, it is possible to reliably provide fold lines B1 and B2 that extend along the MD direction or CD direction and are aligned in the CD direction or MD direction of the wrapping paper B.

[0068] Furthermore, as shown in Figures 8 and 9, packaging paper with fold lines extending diagonally to the MD and CD directions does not offer the same ease of folding as the packaging paper in the embodiment.

[0069] In this embodiment, as described above, the same effects as those of wrapping paper B can be obtained by forming the paper packaging bag 10 with wrapping paper B. That is, in this embodiment, a paper packaging bag 10 can be obtained in which wrapping paper B can be easily folded when packaging the item to be packaged.

[0070] In this embodiment, as described above, the packaging of the paper packaging bag 10 is caramel-style, which allows for compact packaging of the item to be packaged. Although caramel packaging involves more folds in the wrapping paper compared to pillow packaging, etc., since wrapping paper B is used in the paper packaging bag 10, packaging of the item to be packaged is easy even with this type of caramel packaging.

[0071] In this embodiment, the same effects as those of a paper packaging bag 10 can be obtained by constructing a package 100 in which the object to be packaged is housed in a paper packaging bag 10. That is, according to this embodiment, by using wrapping paper B in the paper packaging bag 10 that constitutes the package 100, a package can be obtained in which the wrapping paper B of the paper packaging bag 10 is easy to fold when packaging the object to be packaged.

[0072] In this embodiment, by placing the sheet laminate SL in a paper packaging bag 10 as the object to be packaged, the same effects as those of a paper packaging bag 10 can be obtained. According to this embodiment, by using wrapping paper B in the paper packaging bag 10 that constitutes the packaging body 100, a packaging body 100 can be obtained in which the wrapping paper B of the paper packaging bag 10 is easy to fold when packaging the sheet laminate SL. In addition, by packaging the sheet laminate SL with wrapping paper B, the wrapping paper B is less likely to tear when packaging the sheet laminate SL, and the packaging state of the sheet laminate SL is stabilized. Furthermore, when the packaging state of the sheet laminate SL is stable, the sheets S can be easily removed from the sheet laminate SL.

[0073] The present disclosure will be described in detail below using examples. The examples and comparative examples were evaluated by the following tests.

[0074] <Packaging> As shown in Figures 1 and 2, a packaging was prepared in which a sheet laminate, which consists of multiple sheets stacked together, is packaged in a paper packaging bag 10.

[0075] <Sheet Laminate (Packaged Item)> The sheet laminate consists of paper towels (manufactured by Daio Paper Corporation, Elleair Plus Kirei Compact Type, 2-ply, 200 sheets, basis weight 14.5 g / m²) that are folded alternately and laminated so that they can be pulled out one set at a time in a pop-up fashion. ２ A sheet laminate with a length of 186 mm, a paper packaging bag 10 with a length of 192 mm, and a packaging bag thickness of 40 μm was used.

[0076] <Paper Packaging Bags> Paper packaging bags were used, which were caramel-wrapped using wrapping paper coated with a heat-sealing agent. An opening (tear line for opening) was provided on the top of the packaging bag.

[0077] <Wrapping paper> Wrapping paper has a basis weight of 30-70 g / m². ２ Double-sided kraft paper was used.

[0078] <Basis weight of wrapping paper (grams per square meter)> Basis weight of wrapping paper (g / m²) ２ The measurement was performed in accordance with the provisions of JIS P 8124 (2011).

[0079] <Thickness of Wrapping Paper> The thickness of the wrapping paper was measured using an ISO paper thickness gauge (CITIZEN, MEI-11) in accordance with the provisions of JIS P 8118 (2014). If folds are formed in the wrapping paper, the thickness of the wrapping paper refers to the thickness after the folds have been formed.

[0080] <Tensile Strength of Packaging Paper> The tensile strength of the packaging paper was measured in the longitudinal (MD direction) and transverse (CD direction) directions in accordance with the provisions of JIS P 7127 (1999). Furthermore, the average value of the longitudinal tensile strength and the transverse tensile strength was calculated.

[0081] <Tear Strength> The tear strength of the packaging paper was measured in the longitudinal (MD direction) and transverse (CD direction) directions of the packaging paper using a tear strength tester (Elmendorf tear strength tester, manufactured by Kumagai Riki Kogyo Co., Ltd.) in accordance with the provisions of JIS P 8116 (2000). Furthermore, the average value of the tear strength in the longitudinal direction and the tear strength in the transverse direction was calculated.

[0082] <Gurley Stiffness> The Gurley stiffness of the wrapping paper was measured in the longitudinal (MD direction) and transverse (CD direction) directions of the wrapping paper, in accordance with JIS L-1085:1998 and JIS L-1096:2010. Furthermore, the average value of the Gurley stiffness in the longitudinal and transverse directions was calculated.

[0083] <Taber Stiffness> The Taber stiffness of the packaging paper was measured using a Taber stiffness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.) in accordance with the provisions of JIS P 8125 (2000). Furthermore, the average value of the vertical Taber stiffness and the horizontal Taber stiffness was calculated.

[0084] <Tearing of Packaging Paper During Packaging> Regarding the packaging paper, we checked and evaluated whether the packaging paper tore when packaging the sheet laminate SL. [Evaluation Criteria] Good: No tearing. Unacceptable: Tearing occurred.

[0085] <Ease of Folding> Regarding the wrapping paper, the ease of folding the wrapping paper when packaging the sheet laminate SL was checked and evaluated. [Evaluation Criteria] Good: Easy to fold Poor: Difficult to fold

[0086] Examples and comparative examples will be described below.

[0087] [Example 1] Basis weight 35 g / m ２ Multiple first fold lines extending approximately 1 mm in width along the MD direction and spaced approximately 2 mm apart in the CD direction, and multiple second fold lines extending approximately 1 mm in width along the CD direction and spaced approximately 2 mm apart in the MD direction, were formed on a 56 μm thick wrapping paper by embossing. The conditions of the wrapping paper (basis weight, thickness, tensile strength, tear strength, Gurley stiffness, Taber stiffness) and evaluation results (tear resistance during packaging, ease of folding) are shown in Table 1.

[0088] [Example 2] The basis weight of the wrapping paper was 40 g / m². ２ Except for the above, the packaging paper was prepared in the same manner as in Example 1. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0089] [Example 3] The basis weight of the wrapping paper is 50 g / m². ２The packaging paper was prepared in the same manner as in Example 1, except that its thickness was 75 μm. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0090] [Comparative Example 1] The basis weight of the wrapping paper is 30 g / m². ２ The packaging paper was prepared in the same manner as in Example 1, except that its thickness was 45 μm. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0091] [Comparative Example 2] The basis weight of the wrapping paper is 60 g / m². ２ The packaging paper was prepared in the same manner as in Example 1, except that its thickness was 88 μm. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0092] [Comparative Example 3] The basis weight of the wrapping paper was 70 g / m². ２ Packaging paper was prepared in the same manner as in Example 1, except that its thickness was 103 μm. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0093] [Comparative Example 4] The packaging paper was prepared in the same manner as in Comparative Example 1, except that the thickness of the packaging paper was 43 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0094] [Comparative Example 5] Packaging paper was prepared in the same manner as in Example 1, except that the thickness of the packaging paper was 54 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0095] [Comparative Example 6] Packaging paper was prepared in the same manner as in Example 2, except that the thickness of the packaging paper was 54 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0096] [Comparative Example 7] Packaging paper was prepared in the same manner as in Example 3, except that the thickness of the packaging paper was 72 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0097] [Comparative Example 8] The packaging paper was prepared in the same manner as in Comparative Example 2, except that the thickness of the packaging paper was 85 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0098] [Comparative Example 9] The packaging paper was prepared in the same manner as in Comparative Example 3, except that the thickness of the packaging paper was 99 μm and no fold lines were formed in the packaging paper. The conditions of the packaging paper and the evaluation results are shown in Table 1.

[0099]

[0100]

[0101] Table 1 shows that in Examples 1 to 3, the basis weight was 35 to 50 g / m². ２ The wrapping paper, which had multiple first fold lines extending along the MD direction and aligned in the CD direction, and multiple second fold lines extending along the CD direction and aligned in the MD direction, did not tear and was easy to fold.

[0102] On the other hand, in Comparative Examples 1 and 4, the basis weight was 30 g / m². ２ The packaging bags tore regardless of whether they had folds or not. In comparative examples 2, 3, 8, and 9, the basis weight was 60 g / m². ２ The above packaging bags were difficult to fold, regardless of whether they had creases or not. Furthermore, in Comparative Examples 5 to 7, the packaging paper without creases had a basis weight of 35 to 50 g / m². ２ But it was difficult to fold.

[0103] The embodiments disclosed above include, for example, the following aspects:

[0104] The first aspect of this disclosure is a wrapping paper for packaging an object to be packaged, with a basis weight of 32 g / m². ２ 55g / m or more ２ The following is a wrapping paper having a plurality of first fold lines and / or a plurality of second fold lines, wherein the plurality of first fold lines extend along the MD direction of the wrapping paper and are aligned in the CD direction of the wrapping paper, and the plurality of second fold lines extend along the CD direction and are aligned in the MD direction.

[0105] In the first embodiment, the basis weight is 32 g / m². ２ 55g / m or more ２By providing the following wrapping paper with a first fold line extending along the MD direction and aligned with the CD direction, and / or a second fold line extending along the CD direction and aligned with the MD direction, wrapping paper that is easy to fold when wrapping an object can be obtained. When an object is wrapped with such wrapping paper, the wrapping paper is less likely to tear when the object is wrapped, and the wrapped state of the object is stabilized.

[0106] A second aspect of this disclosure is the packaging paper according to the first aspect, wherein the fold lines are formed by embossing and / or creasing.

[0107] In the second embodiment, fold lines can be reliably provided that extend along the MD direction or CD direction and are aligned in the CD direction or MD direction of the wrapping paper by forming fold lines by embossing and / or creasing.

[0108] A third aspect of this disclosure is a paper packaging bag formed from the packaging paper described in the first or second aspect.

[0109] In the third embodiment, the same effect as the wrapping paper can be obtained by forming the paper packaging bag with the wrapping paper described above. That is, according to the third embodiment, a paper packaging bag can be obtained in which the wrapping paper is easy to fold when packaging the item to be packaged.

[0110] A fourth aspect of this disclosure is a package according to any one of the first to third aspects, wherein the paper packaging bag is caramel-wrapped.

[0111] In the fourth embodiment, the packaging of the paper packaging bag is caramel-style, which allows for compact packaging of the item to be packaged. Although caramel-style packaging involves more folds in the wrapping paper compared to pillow packaging, etc., the aforementioned wrapping paper is used for the paper packaging bag, making it easy to package the item even with this type of caramel-style packaging.

[0112] A fifth aspect of the present disclosure is a packaging body comprising a paper packaging bag as described in the third or fourth aspect, and the packaged object contained in the paper packaging bag.

[0113] In the fifth embodiment, the same effect as the paper packaging bag described above can be obtained by constituting a package in which the object to be packaged is housed in the paper packaging bag described above. That is, according to the fifth embodiment, by using the above-mentioned packaging paper for the paper packaging bag that constitutes the package, a package can be obtained in which the packaging paper of the paper packaging bag is easy to fold when packaging the object to be packaged.

[0114] A sixth aspect of the present disclosure is the packaging according to the fifth aspect, wherein the packaged object is a sheet laminate formed by stacking multiple sheets. In the sixth aspect, the same effects as those of the paper packaging bag described above can be obtained by placing the sheet laminate in the paper packaging bag described above as the packaged object.

[0115] In other words, according to the sixth embodiment, by using the above-mentioned wrapping paper in the paper packaging bag that constitutes the packaging body, a packaging body is obtained in which the wrapping paper of the paper packaging bag is easy to fold when packaging the sheet laminate. Furthermore, by packaging the sheet laminate with the above-mentioned wrapping paper, the wrapping paper is less likely to tear when packaging the sheet laminate, and the packaging state of the sheet laminate becomes stable. Moreover, when the packaging state of the sheet laminate is stable, the sheets can be easily removed from the sheet laminate.

[0116] Although embodiments of this disclosure have been described above, this disclosure is not limited to any particular embodiment, and various modifications and changes are possible within the scope of the invention as described in the claims.

[0117] This application claims priority based on Japanese Patent Application No. 2024-170462, filed on 30 September 2024, the entire contents of which are incorporated herein by reference.

[0118] 100 Sheet packaging 10 Paper packaging bag 10A Edge 10B Edge 11 Top surface 11A Front surface 11B Back surface 12 Bottom surface 13 Front 14 Back surface 15 Side surface 16 Side surface 20 Opening M Tear line 30 Seal area (front seal) 40 Seal area (side seal) 50 Seal area (side seal) B Packaging paper B1, B2 Fold lines C Packaging paper C1, C2 Fold lines S Sheet SL Sheet laminate SD Lamination direction

Claims

1. Wrapping paper for packaging an object to be packaged, with a basis weight of 32 g / m². ２ 55g / m or more ２ A wrapping paper having a plurality of first folds and / or a plurality of second folds, wherein the plurality of first folds extend along the MD direction of the wrapping paper and are aligned in the CD direction of the wrapping paper, and the plurality of second folds extend along the CD direction and are aligned in the MD direction.

2. The packaging paper according to claim 1, wherein the fold lines are formed by embossing and / or creasing.

3. A paper packaging bag formed from the packaging paper described in claim 1 or 2.

4. The paper packaging bag according to claim 3, wherein the packaging of the paper packaging bag is caramel packaging.

5. A packaging body comprising a paper packaging bag as described in claim 3, and the packaged object contained in the paper packaging bag.

6. The packaging according to claim 5, wherein the packaged object is a sheet laminate in which a plurality of sheets are stacked together.

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