Roll product packaging

Abstract

The objective is to provide a roll product packaging that is compact, has good heat-sealability, and can suppress fragrance leakage and film tearing even for long roll products with added fragrance. [Solution] In a roll product packaging in which multiple roll products, each consisting of a sheet of sanitary tissue paper (2x) wound into a roll shape, are stored in a gusset packaging bag made of film, the film has a three-layer structure of polyolefin-nylon-polyolefin and an oxygen permeability of 1000 cc / m². 2 For roll products below the day·atm level, the sheet and / or core contain fragrance, and the roll density is 0.12 g / cm³. 3 More than 0.32g / cm 3 The above problem is solved by a roll product packaging characterized by having a roll length of 30m to 155m and a value of (total mass of the roll to be packaged (g) ÷ tensile breaking strength of the film in the MD direction) of 14 to 42.

Description

Technical Field

[0001] The present invention relates to a roll product package that houses a plurality of thin paper roll products with fragrance.

Background Art

[0002] In recent years, toilet rolls have been considered to have added value in that they are long and compact (high roll density) in terms of good transportation efficiency and reduced replacement frequency, and accordingly the mass of the rolls has been increasing.

[0003] As another added value, there has been proposed a product in which a fragrance is imparted to paper (sheet) or a paper tube as a constituent member. For example, Patent Document 1 discloses a product in which a fragrance is contained in an adhesive for bonding core materials for toilet paper.

[0004] Such long scented toilet rolls are often packaged with PE (polyethylene) or PP (polypropylene) which has good processability (for example, Patent Document 2). However, PE and PP have a high oxygen permeability (low gas barrier property), and the fragrance imparted to the roll product often gradually leaks to the outside of the packaging bag. In such a case, the smell of the roll product becomes weak before the consumer opens the package, and the added value decreases.

[0005] As a method of reducing the oxygen permeability of the film to prevent the leakage of the fragrance, there is known a technique of making the film into a three-layer structure and making the middle layer an "ethylene-vinyl alcohol copolymer film layer (EVOH)" (for example, Patent Document 3). However, a film using EVOH has a low tensile breaking strength and cannot withstand the weight when packaging a heavy long toilet roll, and there has been a case where the film is torn or ripped.

[0006] In order to increase the film strength while keeping the oxygen permeability low, increasing the basis weight of the film or the thickness of each layer tends to make heat seal adhesion insufficient. Also, without changing the film strength, reducing the roll length or reducing the basis weight to reduce the total mass of the roll to be packaged can prevent film breakage, but the compactness decreases.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been made in view of such circumstances, and an object thereof is to provide a roll product package that can suppress the leakage of fragrance and film breakage, is compact, and has good heat sealability even for a long roll product with fragrance.

Means for Solving the Problems

[0009] The inventor conducted intensive studies and found that in a roll product package in which a plurality of roll products obtained by winding a sheet of sanitary tissue paper into a roll shape are stored in a gusset packaging bag made of a film, by defining the relationship between the film material, oxygen permeability, fragrance of the roll product, roll density, roll length, and further the total mass of the roll to be packaged and the tensile breaking strength of the film, the above problems can be solved, and the present invention has been completed.

[0010] (1) A first aspect of the present invention is a roll product package in which a plurality of roll products, each rolled up from a sheet of sanitary tissue paper, are stored in a gusset packaging bag made of film, wherein the film has a three-layer structure of polyolefin-nylon-polyolefin and an oxygen permeability of 1000 cc / m². 2 The product is less than or equal to 0.12 g / cm³, and the roll product contains fragrance in the sheet and / or paper tube, with a roll density of 0.12 g / cm³. 3 More than 0.32g / cm 3 The following describes a roll product packaging characterized by having a roll length of 30m or more and 155m or less, and a value of (total mass of the roll to be packaged (g) ÷ tensile breaking strength of the film in the MD direction) of 14 or more and 42 or less.

[0011] (2) A second aspect of the present invention is a roll product packaging as described in (1), characterized in that the nylon has a thickness of 2 μm or more and 20 μm or less.

[0012] (3) A third aspect of the present invention is a roll product packaging according to (1) or (2), characterized in that the film has a thickness of 15 μm or more and 70 μm or less.

[0013] (4) A fourth aspect of the present invention is a roll product packaging according to (1) or (2), wherein the film has a tensile breaking strength in the MD direction of 25 MPa or more and 65 MPa or less.

[0014] (5) A fifth aspect of the present invention is a roll product packaging according to (1) or (2), wherein the film has a tensile breaking strength in the TD direction of 20 MPa or more and 55 MPa or less.

[0015] (6) A sixth aspect of the present invention is a roll product packaging as described in (1) or (2), wherein the roll product has a (roll length × number of product plies) of 60 or more and a basis weight of 10.0 g / m² per ply. 2 More than 21.0g / m 2 It is characterized by the following:

[0016] (7) A seventh aspect of the present invention is a roll product packaging according to (1) or (2), wherein the film has a tensile elongation at break of 200% or more and 480% or less in the MD direction, and a tensile elongation at break of 310% or more and 690% or less in the TD direction.

[0017] (8) An eighth aspect of the present invention is a roll product packaging according to (1) or (2), wherein the film is characterized in that the value of (tensile breaking strength in the MD direction ÷ roll density) is 105 or more and 320 or less.

[0018] (9) A ninth aspect of the present invention is a roll product packaging according to (1) or (2), characterized in that the thickness of the nylon is 35% or less of the thickness of the film. [Effects of the Invention]

[0019] According to the present invention, even with long roll products containing fragrance, it is possible to provide a roll product packaging that suppresses fragrance leakage and film tearing, is compact, and also has good heat-sealability. [Brief explanation of the drawing]

[0020] [Figure 1] This is a perspective view of a roll product packaging body according to an embodiment of the present invention. [Figure 2] This is a front view of a roll product packaging body according to an embodiment of the present invention. [Figure 3] This is a perspective view of the roll product. [Modes for carrying out the invention]

[0021] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). This embodiment is illustrative for explaining the present invention and is not intended to limit the present invention to the following content. The present invention can be implemented by modifying it as appropriate within the scope of its gist.

[0022] In this specification, "product ply" refers to the number of plies in a roll of tissue paper, without separating the laminated sheets into individual sheets, as is the case with the product.

[0023] In this specification, the "MD direction" of a film means the direction in which the resin flows during injection molding, i.e., the machine direction, and the "TD direction" means the direction perpendicular to the MD direction (transverse direction).

[0024] <Roll product packaging> An embodiment of the roll product packaging 1 (hereinafter also simply referred to as "packaging 1") according to the present invention will be described with reference to Figure 1. Figure 1 is a perspective view of packaging 1. As shown in Figure 1, packaging 1 consists of multiple roll products 2 (hereinafter also simply referred to as "roll 2"), which are rolls of sanitary tissue paper sheets 2x (hereinafter also simply referred to as "sanitary tissue paper 2x" or "sheet 2x") wound into a roll shape, stored in a gusset packaging bag 3 (hereinafter also simply referred to as "packaging bag 3") made of film.

[0025] The present invention will be described below in terms of [1] sanitary tissue paper, [2] roll products, [3] packaging bags, and [4] roll product packaging.

[0026] [1] Sanitary tissue paper Sanitary tissue paper 2x is a sheet-like material that is wound into a roll on roll product 2, such as toilet paper.

[0027] (Material of sanitary tissue paper) Sanitary tissue paper 2x may consist of 100% wood pulp by mass, and may also contain recycled pulp (such as waste paper pulp), non-wood pulp, and deinked pulp. To obtain the target quality, the content of NBKP (bleached softwood kraft pulp) is preferably 0% to 35% by mass, more preferably 2% to 25% by mass, and even more preferably 5% to 15% by mass. Furthermore, the content of LBKP (bleached hardwood kraft pulp) is preferably 65% ​​to 100% by mass, more preferably 75% to 98% by mass, and even more preferably 85% to 95% by mass.

[0028] Furthermore, the content of recycled pulp (such as waste paper pulp derived from liquid beverages like milk cartons) is preferably 50% by mass or less, more preferably 30% by mass or less, even more preferably 20% by mass or less, and most preferably 0% by mass. The content of kraft pulp is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and most preferably 100% by mass.

[0029] Recycled paper pulp derived from liquid beverages such as milk cartons is mainly softwood pulp, which has the advantage of easily improving the strength of sanitary tissue paper 2x. However, it has a large variation in quality, and if the content is too high, it can affect the quality of the product. By keeping the content of recycled pulp, including recycled paper pulp derived from liquid beverages such as milk cartons, within the above range, it is possible to effectively improve the strength of sanitary tissue paper 2x while suppressing variations in quality.

[0030] Furthermore, depending on the required quality of the final product, additives such as debonder softeners, bulking agents, dyes, dispersants, dry strength enhancers, water filtration enhancers, pitch control agents, and absorbency enhancers can be used as additives to the paper pulp. It is preferable not to use wet strength enhancers. Also, when using recycled paper raw materials for toilet paper, it is preferable to perform the same treatment as in the case of virgin paper.

[0031] (Number of plies) The number of plies of the sanitary tissue paper 2x is preferably 1 to 4 plies, more preferably 1 to 3 plies, even more preferably 1 to 2 plies, and most preferably 2 plies. If the number of plies is 5 or more, the total weight of the rolls to be packaged increases, assuming that the basis weight, roll length, and number of rolls to be packaged remain unchanged, making the packaging bag 3 (film) of the packaged body 1 more prone to tearing.

[0032] (Paper thickness per 10 plies) The paper thickness per 10 plies of sanitary tissue paper 2x (hereinafter also simply referred to as "paper thickness (10 plies)") is preferably 0.45 mm or more at the lower limit, more preferably 0.50 mm or more, and even more preferably 0.55 mm or more. The upper limit is preferably 1.60 mm or less, more preferably 1.50 mm or less, and even more preferably 1.40 mm or less. If the paper thickness (10 plies) is less than 0.45 mm, the roll length increases, and the mass of roll 2 and the total mass of rolls to be packaged increase, making the packaging bag 3 (film) of the packaging body 1 more prone to tearing, provided that the basis weight, roll diameter, and number of rolls packaged remain unchanged. If the paper thickness (10 plies) exceeds 1.60 mm, the roll diameter increases and the roll density decreases, resulting in a less compact packaging body 1, provided that the roll length and roll density remain unchanged.

[0033] The paper thickness shall be the value measured by the following method. The device used shall be a thickness gauge (Dial Thickness Gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). (1) The measurement conditions are a measuring load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring stand, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. (2) The paper thickness will be measured at 10 points in total: 5 points in the MD direction of the sanitary tissue paper sheet that are different from each other, and 5 points shifted in the CD direction so that the measurement positions do not overlap. It is important to measure the paper thickness at 10 different points, but the exact positions are not required. (3) When the product ply is 1 ply, stack 10 sheets, and when it is 2 plies, stack 5 sets. Repeat the measurement of the paper thickness per 10 plies 10 times using the above measurement method, average the measurement results, and use the measured value of the paper thickness (10 plies). (4) When the product ply is 3 plies, stack 4 sets, and when it is 4 plies, stack 3 sets. Repeat the measurement of the paper thickness per 12 plies 10 times using the above measurement method, and average the measurement results. Convert the paper thickness per 12 plies to that per 10 plies, and use the measured value of the paper thickness (10 plies).

[0034] (Basis weight) The basis weight per ply of the sanitary tissue paper 2x (hereinafter, also simply referred to as "basis weight (1 ply)") is 10.0 g / m 2 or more and 21.0 g / m 2 or less is preferable. When the basis weight (1 ply) is less than 10.0 g / m 2 , if the roll length remains unchanged, the roll density becomes low, resulting in inferior compactness of the package 1. When the basis weight (1 ply) exceeds 21.0 g / m 2 , if the roll length, ply number, and the number of rolls to be packaged remain unchanged, the mass of the roll 2 and the total mass of the rolls to be packaged increase, and the packaging bag 3 (film) of the package 1 is likely to break. The lower limit value of the basis weight (1 ply) is more preferably 11.0 g / m 2 or more, even more preferably 12.0 g / m 2 or more. The upper limit value is more preferably 20.0 g / m 2 or less, even more preferably 19.0 g / m 2 or less. The basis weight is measured based on JIS P 8124.

[0035] (Specific volume) The specific volume per ply of the sanitary tissue paper 2x (hereinafter, also simply referred to as "specific volume (1 ply)") has a lower limit value of 2.0 cm 3 / g or more is preferable, 3.0 cm 3 / g or more is more preferable, 4.0 cm 3 / g or more is even more preferable. The upper limit value is 10.0 cm 3 / g or less is preferable, 9.0 cm 3 / g or less is more preferable, 8.0 cm3 A value of less than / g is even more preferable. Specific volume (1 ply) of 2.0 cm³ is preferred. 3 If the weight is less than / g, and the roll diameter, basis weight, and number of rolls packaged remain unchanged, the paper thickness decreases and the roll length increases, which increases the mass of roll 2 and the total mass of the packaged rolls, making the packaging bag 3 (film) of package 1 more prone to tearing. Specific volume (1 ply) is 10.0 cm³. 3 If the weight exceeds / g, the paper thickness increases and the roll length decreases, resulting in a less compact packaging, even if the roll diameter and basis weight remain unchanged.

[0036] Specific volume (1 ply) is calculated by dividing the paper thickness (10 plies) by the basis weight (1 ply), and then determining the volume per gram (cm³). 3 It is represented as follows.

[0037] (Sheet length) Preferably, the sanitary tissue paper 2x of roll 2 has perforations 2c in the roll width direction at approximately equal intervals in the roll winding direction. The sheet length between one perforation 2c and an adjacent perforation 2c (length in the Y direction shown in Figure 3) is preferably 200 mm or more at the lower limit, more preferably 210 mm or more, and even more preferably 220 mm or more. The upper limit is preferably 260 mm or less, more preferably 250 mm or less, and even more preferably 240 mm or less. If the sheet length is less than 200 mm, it becomes easier for the paper to break when roll 2 is tightly wound, resulting in poor operability. If the sheet length exceeds 260 mm, the number of pressure points by the perforating blades that create the perforations 2c decreases, so the areas where the paper thickness is low within the sheet 2x decrease, and the winding diameter increases, resulting in poor compactness. Also, if the sheet length is within this range, a sheet 2x cut into single sheets can maintain appropriate water absorption, and moisture can be wiped away without soiling hands or waste.

[0038] (Seat width) The sheet width (hereinafter also referred to as "roll width") (W shown in Figure 3) of the sanitary tissue paper 2x of roll 2 is preferably 100 mm or more, more preferably 103 mm or more, and even more preferably 105 mm or more. The upper limit is preferably 125 mm or less, more preferably 120 mm or less, and even more preferably 117 mm or less. If the sheet width is less than 100 mm, the water absorption of the sheet 2x cut into individual sheets will be poor. If the sheet width exceeds 125 mm, the mass of roll 2 and the total mass of the packaged roll will increase, and the packaging bag 3 (film) of the package 1 will be more prone to tearing, provided that the basis weight and roll length remain unchanged.

[0039] (Embossed) Sheet 2x may or may not be embossed, but embossing is preferred. Furthermore, single embossing or double embossing is preferred, with single embossing being more preferred. For example, in the case of a 2-ply sheet, possible combinations of embossing include: (1) double embossing with micro-embossing on the front sheet 2a and micro-embossing on the back sheet 2b; (2) decorative embossing on the front sheet 2a and no embossing on the back sheet 2b; and (3) double embossing with decorative embossing on the front sheet 2a and micro-embossing on the back sheet 2b.

[0040] The embossing pattern can be selected from micro-embossing or decorative embossing.

[0041] (Number of embossed areas) The minimum number of embossed areas per unit area in a 2x sheet is 3 embossed areas / cm². 2 The above is preferable, with 5 pieces / cm 2 The above is more preferable at 8 pieces / cm 2 The above is even more preferable. The upper limit is 80 pieces / cm 2 The following is preferable: 60 pieces / cm 2 The following is more preferable: 15 pieces / cm 2 The following is even more preferable: The number of embossed marks is 3 per cm. 2 More than 80 pieces / cm 2The following conditions will result in an appropriate embossed area per sheet 2x, and good water absorption for sheet 2x. To measure the number of embossed areas, draw a 10mm x 10mm line containing two or more embossed areas, and count the number of embossed areas within the square. Note that linear embossed areas are not included in the count.

[0042] (Sheet joining) The sheets can be joined by a method of pressing multiple sheets together simultaneously with single embossing, or by joining them independently of embossing using glue or knurling (edge ​​embossing). Among these, the method of pressing multiple sheets together simultaneously with single embossing or joining by knurling is preferred, and the method of pressing multiple sheets together simultaneously with single embossing is more preferred.

[0043] [2] Roll products Roll product 2 is made by winding the above-mentioned sheets 2x of sanitary tissue paper onto a paper tube 2d in a roll shape.

[0044] (Paper tube) The paper tube 2d (hereinafter also referred to as "core 2d") located in the center of the roll 2 and used to wind the sheet 2x into a roll shape is preferably a roughly cylindrical paper tube. The material (paper) used for the paper tube 2d preferably contains bleached kraft pulp (BKP) such as bleached hardwood kraft pulp (LBKP) or bleached softwood kraft pulp (NBKP) as pulp fibers. The pulp content (mass%) of the paper used for the paper tube 2d is preferably NBKP:LBKP of 50:50 to 0:100, more preferably 30:70 to 0:100, and even more preferably 10:90 to 0:100. Furthermore, from the viewpoint of strength, it is preferable that the paper used for the paper tube 2d is made up of multiple layers.

[0045] (Paper tube outer diameter) The outer diameter of the paper tube 2d (DI in Figure 3) is preferably 20 mm or more at the lower limit, more preferably 25 mm or more, and even more preferably 30 mm or more. The upper limit is preferably 60 mm or less, more preferably 55 mm or less, and even more preferably 50 mm or less. If the outer diameter of the paper tube is less than 20 mm, the winding length will increase if the winding diameter, winding density, and number of rolls of the package remain unchanged, increasing the mass of roll 2 and the total mass of the rolls being packaged, making the packaging bag 3 (film) of the package 1 more prone to tearing. If the outer diameter of the paper tube exceeds 60 mm, the winding length will decrease if the winding diameter and winding density remain unchanged, resulting in a less compact package 1.

[0046] The outer diameter of the paper core is measured using a Diameter Rule manufactured by Muratec KDS Co., Ltd. The measurement is taken by measuring the midpoint of the paper core lengths (lengths in the X direction as shown in Figure 3) of three rolls 2, and averaging the results. If there is no paper core 2d in roll 2 (coreless), the diameter of the central hole in roll 2 is measured.

[0047] (Paper tube mass) The lower limit of the mass of the paper core 2d per roll width of 114 mm is preferably 2.0 g or more, more preferably 2.5 g or more, and even more preferably 3.0 g or more. The upper limit is preferably 9.0 g or less, more preferably 8.0 g or less, and even more preferably 7.0 g or less. If the mass of the paper core is less than 2.0 g, the strength of the paper core 2d will be weak when the fragrance is applied, and it will be more likely to be crushed when tightly wound. If the mass of the paper core exceeds 9.0 g, the roll mass will increase, and the total mass of the rolls to be packaged will also increase, making the packaging bag 3 (film) of the packaging body 1 more likely to tear.

[0048] (winding diameter) The lower limit of the winding diameter of roll 2 (DR in Figure 3) is preferably 100 mm or more, more preferably 105 mm or more, and even more preferably 110 mm or more. The upper limit is preferably 130 mm or less, more preferably 125 mm or less, and even more preferably 120 mm or less. If the winding diameter is less than 100 mm, the winding length will be shorter if the basis weight and winding density remain unchanged, resulting in poorer compactness of the packaging 1. If the winding diameter exceeds 130 mm, the winding length will be longer if the basis weight, winding density, and the number of rolls to be packaged remain unchanged, increasing the mass of roll 2 and the total mass of the rolls to be packaged, making the packaging bag 3 (film) of the packaging 1 more prone to tearing.

[0049] The winding diameter of roll 2 is measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement is taken at the center of the roll width direction (X direction shown in Figure 3) of three rolls 2, and the measurement results are averaged.

[0050] (Length of volume) The length of roll 2 is between 30m and 155m. If the length is less than 30m, the compactness of the packaging 1 will be poor if the basis weight of the sanitary tissue paper 2x remains unchanged. If the length exceeds 155m, the mass of roll 2 and the total mass of the packaged rolls will increase if the basis weight of the sanitary tissue paper 2x remains unchanged, making the packaging bag 3 (film) more prone to tearing. The lower limit of the length is preferably 40m or more, and more preferably 45m or more. The upper limit is preferably 105m or less, and more preferably 85m or less.

[0051] The roll length is measured as follows: First, measure the length of 10 sheets between perforation 2c and the adjacent perforation 2c on roll 2. Then, measure the number of sheets on roll 2, and calculate the roll length proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 2.30m and the number of sheets is 326, then 2.30m × (326 / 10) = 75m. If roll 2 does not have perforations, measure the roll length directly.

[0052] (Length x Number of plies) It is preferable that the value obtained by multiplying the length of roll 2 by the number of plies (= length × number of plies) is 60 or more. If this value is less than 60, the winding density and roll density will be small, resulting in poorer compactness of the packaging 1.

[0053] (winding density) The winding density of roll 2 has a lower limit of 0.60 m / cm². 2 The above is preferable, and 0.80 m / cm 2 The above is more preferable, 1.00 m / cm 2 The above is even more preferable. The upper limit is 2.00 m / cm 2 The following is preferred: 1.80 m / cm 2 The following is more preferable: 1.60 m / cm 2 The following is even more preferable: a winding density of 0.60 m / cm². 2 If the winding density is less than 2.00 m / cm², the winding length will be shorter if the winding diameter and ply count remain the same, resulting in less compact packaging. 2 If it exceeds this limit, the roll length increases, and if the basis weight, ply count, and number of rolls of sanitary tissue paper 2x remain unchanged, the mass of roll 2 and the total mass of the rolls to be packaged will increase, making the packaging bag 3 (film) of packaging 1 more prone to tearing.

[0054] Winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the outer diameter (winding diameter DR) portion of the roll - (cross-sectional area of ​​the outer diameter DI portion of the core)}. For example, in the case of a winding length of 76m, 2 plies, winding diameter DR 118mm, and core outer diameter DI 39mm, winding density = (76m × 2) ÷ {3.14 × (118mm ÷ 2 ÷ 10)} 2 -3.14 × (39mm ÷ 2 ÷ 10) 2} = 1.55 m / cm 2 This is the result.

[0055] (Roll weight <without paper core>) The roll mass of roll 2, excluding the paper core 2d per roll width of 114 mm (hereinafter also simply referred to as "roll mass <without paper core>"), is preferably 130g or more, more preferably 160g or more, and even more preferably 190g or more. The upper limit is preferably 340g or less, more preferably 315g or less, and even more preferably 300g or less. If the roll mass <without paper core> is less than 130g, the roll density will be low, and the compactness of the packaging 1 will be poor. If the roll mass <without paper core> exceeds 340g, the mass of roll 2 will increase, and if the number of rolls to be packaged remains the same, the packaging bag 3 (film) of the packaging 1 will be more prone to tearing.

[0056] (Roll density) The roll density of Roll 2 is 0.12 g / cm³. 3 More than 0.32g / cm 3 The following applies: Roll density is 0.12 g / cm³ 3 If the roll density is less than 0.32 g / cm³, the compactness of the packaging 1 is poor. 3 If this value is exceeded, and the number of rolls being packaged remains the same, the mass of roll 2 and the total mass of the rolls being packaged will increase, making the packaging bag 3 (film) of package 1 more prone to tearing. The lower limit of the roll density is 0.15 g / cm³. 3 The above is preferable, 0.19 g / cm³ 3 The above is preferable. The upper limit is 0.30 g / cm³. 3 The following is preferable: 0.26 g / cm³ 3 The following are preferable.

[0057] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of roll 2 per 114 mm roll width. Roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR) portion} - (cross-sectional area of ​​the core's outer diameter DI portion)] × roll width (converted to per 114 mm). For example, if the roll mass (without paper core) per 108 mm roll width is 241 g, the winding diameter DR is 118 mm, and the core outer diameter DI is 39 mm, then roll density = [241 g × 114 mm ÷ 108 mm] ÷ [{3.14 × (118 mm ÷ 2 ÷ 10)] 2 -3.14 × (39mm ÷ 2 ÷ 10) 2} × (114 mm ÷ 10) = 0.23 g / cm 3 This is the result.

[0058] (Adding fragrance) The roll 2 contains a fragrance. For example, the fragrance is applied to either the paper tube 2d or the sanitary tissue paper 2x, or to both the paper tube 2d and the sanitary tissue paper 2x. The fragrance can be applied by any known method, such as directly applying the fragrance to the paper tube 2d, mixing the fragrance into the adhesive used in the manufacture of the paper tube 2d, or mixing the fragrance into the adhesive of the tail seal of the roll 2.

[0059] The amount of fragrance added is preferably 0.01g or more per roll, and more preferably 0.03g or more. A sufficient fragrance can be obtained in toilets, etc., with 0.01g or more.

[0060] [3] Packaging bag Specific examples of the packaging bag 3 are shown in Figures 1 and 2. The packaging bag 3 (hereinafter also simply referred to as "film 3") is a gusseted packaging bag capable of holding multiple roll products 2, and is formed from a multilayer film (3A, 3B, 3C in Figure 2) made by laminating three layers of resin film having gas barrier properties.

[0061] (Gusseted packaging) As shown in Figure 1, it is preferable that the packaging bag 3 has a main body 31 made of a tubular film that can store multiple roll products 2, and a handle portion 32 on the upper end of the main body.

[0062] As shown in Figure 2, the packaging bag 3 is constructed by, for example, folding both the left and right sides of a tubular film symmetrically inward as gussets, folding the folded edges of each gusset into a flat shape so that they meet near the lateral center of the packaging bag, and heat-sealing the appropriate parts of the folded portion at the top. The handle portion 32 is a rectangular, flat portion with a seal line 32b integrated and fixed by heat sealing. Preferably, the handle portion 32 is provided with a finger hole 32c for consumers to use when carrying the bag home after purchase. Preferably, the handle portion 32 is also integrated by heat sealing with one or more reinforcing films (not shown) that have perforations (not shown) or slits (not shown) similar to those of the finger hole 32c.

[0063] The main body 31 of the packaging bag 3 has an opening at the bottom, into which the roll product 2 is placed, and then the opening 31a is sealed with a heat seal. When the roll product 2 is placed inside, the gusset of the main body is unfolded, and the main body 31 forms four sides with a rectangular cross-section. Although not shown in the figures, the packaging bag 3 preferably has an intermittent section in the seal line 32b of the handle portion 32, or an opening in the main body 31 or the handle portion 32, as a ventilation section to avoid the film bursting during manufacturing, and it is more preferable to have an intermittent section in the seal line 32b of the handle portion 32.

[0064] The "openings" provided in the main body 31 and handle 32 are, for example, composed of a notched piece and a small hole formed when the notched piece protrudes outward, and are referred to as functioning as valves. Specifically, for example, when the inside of the packaging 1 expands or is compressed by external pressure, the notched piece opens (protrudes), allowing the air inside the packaging 1 to escape outward through the small hole. After the air has escaped, the restoring force of the base end of the notched piece causes it to return to its original position and close, thus performing a valve-like operation in the "openings."

[0065] (Film structure) As shown in Figure 2, the packaging bag (film) 3 is composed of a three-layer film in which thermoplastic resin films 3A and 3C are laminated on both sides of a gas barrier resin film 3B (hereinafter also referred to as "middle layer 3B"). Hereinafter, in the thermoplastic resin film, the surface in contact with the outside of the packaging body 1 is also referred to as the surface layer 3A, and the surface in contact with the inside is also referred to as the back layer 3C.

[0066] (Thermoplastic resin film) The outer layer 3A and inner layer 3C of the packaging bag 3 are made of polyolefin resin. Using polyolefin resin allows for easy manufacturing of the packaging bag 3, provides good heat sealability, and offers strong impact resistance. Among polyolefin resins, polyethylene (PE) is preferred, and low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and a mixture of low-density polyethylene and linear low-density polyethylene (LDPE + LLDPE) are even more preferred. Note that the outer layer 3A and inner layer 3C may be made of different materials as long as they are polyolefin resins.

[0067] (Gas barrier resin film) The middle layer 3B of packaging bag 3 is made of nylon. By using nylon for the middle layer 3B, the leakage of fragrance can be sufficiently suppressed, and furthermore, it is possible to create a higher-strength packaging material compared to conventional packaging bags where the middle layer 3B is made of EVOH film (of the same thickness).

[0068] (Thickness of the middle layer) The thickness of the middle layer 3B is preferably between 2 μm and 20 μm. If the thickness of the middle layer 3B is less than 2 μm, the fragrance is more likely to leak out, and if it exceeds 20 μm, the heat sealability of the packaging bag 3 will be poor. The lower limit of the thickness of the middle layer 3B is more preferably 3 μm or more, and even more preferably 4 μm or more. The upper limit is more preferably 16 μm or less, and even more preferably 12 μm or less. The thickness of the middle layer 3B can be observed and measured by observing the cross-section of the film 3 with an optical microscope. If the thickness of the middle layer 3B cannot be measured from the product, the thickness of the middle layer 3B in its single-layer state before lamination into three layers shall be measured in accordance with JIS K 7130.

[0069] (Overall thickness) The thickness of the packaging bag (film) 3, that is, the thickness of the three laminated layers (hereinafter also referred to as "total thickness"), is preferably 15 μm or more and 70 μm or less. If the total thickness is less than 15 μm, the film 3 will tear easily, and if it exceeds 70 μm, the heat sealability of the packaging bag 3 will be poor. The lower limit of the total thickness is more preferably 20 μm or more, and even more preferably 25 μm or more. The upper limit is more preferably 65 μm or less, and even more preferably 60 μm or less. The thickness of the packaging bag (film) 3 shall be measured in accordance with JIS K 7130 and shall be used as the thickness of the packaging bag (film) 3.

[0070] (Thickness of the middle layer / Total thickness) The ratio of the thickness of the middle layer to the total thickness of the packaging bag (film) 3, i.e., (thickness of the middle layer ÷ total thickness × 100), is preferably 3% or more and 35% or less. If this ratio is less than 3%, the fragrance is more likely to leak out if the middle layer 3B is thin, and the heat sealability is poor if the entire film is thick. If this ratio exceeds 35%, the heat sealability of the packaging bag 3 is poor if the middle layer 3B is thick, and the packaging bag 3 is more likely to tear if the entire film is thin. The lower limit of this ratio is more preferably 6% or more, and even more preferably 8% or more. The upper limit is more preferably 30% or less, and even more preferably 25% or less.

[0071] (Film basis weight) The basis weight of packaging bag (film) 3 (hereinafter also referred to as "film basis weight") has a lower limit of 14 g / m². 2 The above is preferable, and 18 g / m 2 The above is more preferable: 22 g / m 2 The above is even more preferable. The upper limit is 63 g / m². 2 The following is preferable: 59 g / m 2 The following is more preferable: 54 g / m 2 The following is even more preferable: Film basis weight is 14 g / m². 2 If it is less than 63g / m², the packaging bag 3 will tear easily. 2 Beyond a certain point, the heat-sealing properties of packaging bag 3 deteriorate.

[0072] (Oxygen permeability) The oxygen permeability of packaging bag (film) 3 is 1000 cc / m². 2 The oxygen permeability is less than 1000 cc / m³. 2 If the oxygen permeability exceeds 700 cc / m³, the fragrance is more likely to leak. 2 • Day ATM or less is preferred, and 400cc / m 2 A value of less than 5 cc / m³ is preferable. On the other hand, the lower limit of oxygen permeability is 5 cc / m³. 2 • 10cc / m² or more is preferred. 2 • 15cc / m² or more is preferable. 2 A day atm or higher is even more preferable. Oxygen permeability of 5 cc / m³ is preferable. 2 If the oxygen permeability is less than 1 / day·atm, the heat sealability of the packaging bag 3 will be worse as the oxygen permeability decreases when the thickness or basis weight of the film 3 is increased. The oxygen permeability can be measured according to JIS K 7126-1987 (Test method for gas permeability of plastic films and sheets).

[0073] (Tensile breaking strength) <md>) Tensile breaking strength in the MD direction of packaging bag (film) 3 (hereinafter simply referred to as "tensile breaking strength") <md>The tensile strength (also known as ") is preferably 25 MPa to 65 MPa. <md>However, if the tensile strength is less than 25 MPa, the packaging bag 3 becomes prone to tearing, and if it exceeds 65 MPa, the heat-sealing properties of the packaging bag 3 deteriorate when the thickness or basis weight of the packaging bag (film) 3 is increased. Tensile breaking strength <md>The lower limit is more preferably 28 MPa or higher, and even more preferably 30 MPa or higher. The upper limit is more preferably 60 MPa or lower, and even more preferably 55 MPa or lower.

[0074] (Tensile breaking strength) The tensile breaking strength in the TD direction of the packaging bag (film) 3 (hereinafter also simply referred to as "tensile breaking strength") is preferably 20 MPa or more and 55 MPa or less. If the tensile breaking strength is less than 20 MPa, the packaging bag 3 will tear easily, and if it exceeds 55 MPa, the heat sealability of the packaging bag 3 will be poor when the thickness or basis weight of the packaging bag (film) 3 is increased. The lower limit of the tensile breaking strength is more preferably 23 MPa or more, and even more preferably 25 MPa or more. The upper limit is more preferably 50 MPa or less, and even more preferably 45 MPa or less.

[0075] (tensile elongation at fracture) <md>) Tensile elongation at break in the MD direction of the packaging bag (film) 3 (hereinafter simply referred to as "tensile elongation at break") <md>The tensile elongation at break (also known as ") is preferably between 200% and 480%. <md>However, if it is less than 200%, the packaging bag 3 becomes prone to tearing, and if it exceeds 480%, the heat-sealing properties of the packaging bag 3 deteriorate when the thickness or basis weight of the packaging bag (film) 3 is increased. Tensile elongation at break <md>The lower limit is more preferably 230% or higher, and even more preferably 250% or higher. The upper limit is more preferably 450% or lower, and even more preferably 420% or lower.

[0076] (Tensile elongation at fracture) The tensile elongation at break in the TD direction of the packaging bag (film) 3 (hereinafter also simply referred to as "tensile elongation at break") is preferably 310% or more and 690% or less. If the tensile elongation at break is less than 310%, the packaging bag 3 will tear easily, and if it exceeds 690%, the heat sealability of the packaging bag 3 will be poor when the thickness or basis weight of the packaging bag (film) 3 is increased. The lower limit of the tensile elongation at break is more preferably 350% or more, and even more preferably 390% or more. The upper limit is more preferably 650% or less, and even more preferably 610% or less.

[0077] Tensile breaking strength <md>, and tensile elongation at fracture <md>This can be measured according to JIS Z 1702.

[0078] The multilayer film of packaging bag 3 can be manufactured using any commonly used manufacturing method, such as the T-die method or the lamination method. The inflation method is preferable from a cost perspective because it can produce both a film and a bag at the same time.

[0079] The multilayer film of the packaging bag (film) 3 may contain one or more additives such as antistatic agents, lubricants, UV absorbers, and colorants, which are suitable for bag making, printing, filling, etc.

[0080] [4] Roll product packaging The roll product packaging 1 contains multiple roll products 2 stored in a packaging bag 3. For example, Figure 1 is a perspective view of a roll product packaging 1 in which four roll products 2 are arranged in two rows vertically and horizontally, and these are stacked in two layers with the axes of the cores 2d of the roll products 2 aligned vertically, resulting in a total of eight roll products 2 stored in a packaging bag 3. The roll product packaging 1 of the present invention is not limited to the example shown in Figure 1, and can be obtained by storing any number of roll products 2 in any way in the packaging bag 3 of the present invention.

[0081] (Number of rolls packaged) The number of rolls 2 packaged in the packaging 1 is preferably 2 or more, more preferably 3 or more, and even more preferably 4 or more. The upper limit is preferably 12 or less, more preferably 10 or less, and even more preferably 8 or less. If the number of rolls is less than 2, the compactness of each pack of packaging 1 is poor. If the number of rolls exceeds 12, the total mass of the packaged rolls 2 increases, making the packaging bag 3 of packaging 1 more prone to tearing.

[0082] (Total mass of the rolls to be packaged) The total mass of the rolls 2 packaged in the packaging 1 (hereinafter also simply referred to as "mass M") is preferably 450g or more at the lower limit, more preferably 600g or more, and even more preferably 750g or more. The upper limit is preferably 2000g or less, more preferably 1800g or less, and even more preferably 1600g or less. If mass M is less than 450g, the compactness of each pack of packaging 1 is poor. If mass M exceeds 2000g, the packaging bag 3 becomes prone to tearing.

[0083] (Total mass of the rolls to be packaged (mass M) / tensile breaking strength) <md>) The value obtained by dividing the total roll mass (g) by the tensile breaking strength (MPa) of the packaging bag (film) 3 in the MD direction is between 14 and 42. If this value is less than 14, the compactness of the packaging 1 will be poor when the total roll mass is low. If this value exceeds 42, the packaging bag 3 will be prone to tearing. The lower limit of this value is preferably 17 or higher, and more preferably 20 or higher. The upper limit is preferably 38 or lower, and more preferably 34 or lower.

[0084] (Tensile breaking strength) <md>(roll density) The tensile breaking strength (MPa) in the MD direction of packaging bag (film) 3 is determined by the roll density (g / cm³). 3 The value obtained by dividing by ) is preferably between 105 and 320. If this value is less than 105, the roll density is high, and if the number of rolls being packaged remains the same, the packaging bag 3 of the package 1 will be prone to tearing. If this value exceeds 320, the compactness of the package 1 will be poor if the roll density is low. Also, if the overall thickness of the film 3 increases, and the tensile breaking strength in the MD direction of the packaging bag (film) 3 increases, the heat sealability of the packaging bag 3 will be poor. The lower limit of this value is more preferably 110 or higher, and even more preferably 115 or higher. The upper limit is more preferably 270 or lower, and even more preferably 220 or lower.

[0085] <Manufacturing method for rolled products> The roll product 2 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding as needed, (3) roll winding, and (4) cutting with a log saw. The following describes the process of (1).

[0086] (Papermaking and creping) (1) Paper is made from the pulp described above on the wire section of a known paper machine, and then transferred to the felt of the press section. Examples of wire section types include circular wire type, long wire (ford linear) type, suction breast type, short wire type, twin wire type, crescent former type, etc. (2) Then, the web is mechanically compressed with a suction pressure roll, a pressure roll without suction, or a press roll, or dewatering is continued by employing a dewatering method such as hot air drying. The suction pressure roll or the pressure roll without suction is also used as a means to move the web from the press part to the Yankee dryer. (3) The webs that have been moved to the Yankee Dryer are dried in the Yankee Dryer and Yankee Dryer Hood, then creped by a creping doctor and wound up in a reel part. (4) Creping (creating wavy wrinkles known as crepes) is the mechanical compression of paper in the longitudinal direction (the direction in which the sheet travels on the paper machine). When manufacturing the web of 2x sheets of sanitary tissue paper, the creping doctor peels the web off the Yankee dryer and winds it up on the reel part. Due to the speed difference between the Yankee dryer and the reel part (speed of the reel part ≤ speed of the Yankee dryer), the crepes (wrinkles) are formed by the creping doctor.

[0087] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention. [Examples]

[0088] The present invention will be described in detail below with reference to examples. However, the present invention is not limited in any way to the examples shown below.

[0089] The roll product packaging for the examples and comparative examples shown in Tables 1 and 2 was manufactured through the following processes: (1) papermaking and creping, (2) embossing and joining, (3) roll winding, (4) cutting with a log saw, and (5) storage in packaging bags. The fragrance was applied directly to the paper core, with 0.03 g of floral fragrance per roll. The above parameters (dimensions, mass, physical properties, etc.) were measured for all the roll product packaging for the examples and comparative examples, and the following evaluations were performed.

[0090] 1. Resistance to fragrance leakage The "resistance to fragrance leakage" of roll product packaging was evaluated by 30 monitors using 30 post-manufacturing roll product packaging packs. Each monitor smelled an unopened roll product packaging and selected either "no fragrance leakage" or "fragrance leakage." The number of people who selected "fragrance leakage" was used to evaluate the product on a four-point scale, with a score of △ or higher considered a pass. The evaluation criteria are as follows: ◎: 0 people selected "The scent of fragrance is leaking out." ○: 1-2 people selected "The scent of fragrance is leaking out." △: 3-4 people selected "The scent of fragrance is leaking out." ×: Five or more people selected "The scent of fragrance is leaking out."

[0091] 2. The tear resistance of the packaging bag. The "tear resistance of the packaging bag" of roll product packaging was evaluated by a single monitor using a visual inspection of 30 roll product packaging packs after manufacturing. The monitor held an unopened roll product packaging pack with a finger inserted into the finger hole of the handle and shook it up and down 50 times at a specified speed. The monitor selected either "no tear in the packaging bag (film)" or "tear occurred in the packaging bag (film)," and evaluated the product on a four-point scale based on the number of products for which "tear occurred in the packaging bag (film)," with a score of △ or higher considered a pass. The evaluation criteria are as follows: ◎: The number of products for which "The packaging bag (film) has been torn" was selected is 0. ○: 1 to 3 packs of products selected as "Tears occurred in the packaging bag (film)." △: 4-6 packs of products selected as "Tears occurred in the packaging bag (film)." ×: 7 or more product packs selected as "Tears occurred in the packaging bag (film)."

[0092] 3. Compactness of the packaging The "compactness of the packaging" of roll product packaging refers to the "roll density (g / cm³)" of the roll product. 3 Based on the measurement results of ), the following evaluation criteria were used to evaluate the product on a four-point scale, with a score of △ or higher considered a pass. ◎ : (Roll density) ≥ 0.19 ○ : 0.19 > (roll density) ≥ 0.15 △ : 0.15 > (roll density) ≥ 0.12 × :0.12>(roll density)

[0093] 4. Heat sealability of packaging bags The heat-sealability of roll product packaging bags was evaluated by a single monitor using a visual inspection of 30 roll product packaging packs after manufacturing. The "opening of the main body" and the "seal line of the handle" of the roll product packaging were visually inspected, and either "no openings in part or all of the seal area" or "some openings in part or all of the seal area" were selected. The evaluation was based on a 5-point scale depending on the number of products selected as having "some openings in part or all of the seal area," with a score of ▲ or higher considered a pass. The evaluation criteria are as follows: ◎ : 0 packs ○: 1-2 packs △: 3-4 packs ▲: 5-6 packs ×: 7 packs or more

[0094] The results obtained are shown in Tables 1 and 2.

[0095] [Table 1]

[0096] [Table 2]

[0097] As is clear from the results shown in Tables 1-2, the roll product packaging of Examples 1-20 exhibited good resistance to fragrance leakage, resistance to tearing of the packaging bag, compactness of the packaging, and heat-sealability of the packaging bag. In contrast, Comparative Examples 1-7 were inferior in any of the following areas: resistance to fragrance leakage, resistance to tearing of the packaging bag, compactness of the packaging, and heat-sealability of the packaging bag.

[0098] From the above, it has been confirmed that the present invention can provide a roll product packaging that is compact, has good heat-sealability, and can suppress the leakage of fragrance and tearing of the film, even for long roll products with fragrance. [Explanation of symbols]

[0099] 1: Roll product packaging (packaging) 2: Roll products (rolls) 2a: Surface sheet 2b: Sheet on the back 2c: Perforation 2d:Paper tube 2e: The outermost edge of the roll product 2x: Sanitary tissue paper (sheets) 3: Packaging bag (film) 3A: Thermoplastic resin film (surface layer) 3B: Gas barrier resin film (middle layer) 3C: Thermoplastic resin film (backing layer) 31: Main body 31a: Opening 31a 32: Handle part 32a: Perforations for opening 32b: Seal line 32c: Finger hole< / md> < / md> < / md> < / md> < / md> < / md> < / md> < / md> < / md> < / md> < / md> < / md>

Claims

1. A roll product packaging in which multiple roll products, each consisting of a sheet of sanitary tissue paper 2x wound into a roll shape, are stored in a gusset packaging bag made of film, The aforementioned film is It has a three-layer structure of polyolefin-nylon-polyolefin, Oxygen permeability of 1000 cc / m³ ２ ・day・atm or less, The aforementioned roll product is The aforementioned sheet and / or paper tube contains fragrance, Roll density is 0.12 g / cm ３ 0.32g / cm or more ３ below, The roll length is between 30m and 155m. A roll product packaging characterized in that the value of (total mass of the rolls to be packaged (g) ÷ tensile breaking strength of the film in the MD direction) is 14 or more and 42 or less.

2. The roll product packaging according to claim 1, characterized in that the nylon has a thickness of 2 μm or more and 20 μm or less.

3. The roll product packaging according to claim 1 or 2, characterized in that the film has a thickness of 15 μm or more and 70 μm or less.

4. The roll product packaging according to claim 1 or 2, characterized in that the film has a tensile breaking strength in the MD direction of 25 MPa or more and 65 MPa or less.

5. The roll product packaging according to claim 1 or 2, characterized in that the film has a tensile breaking strength in the TD direction of 20 MPa or more and 55 MPa or less.

6. The aforementioned roll product is (The above-mentioned length × number of product plies) is 60 or more, The basis weight per ply is 10.0 g / m². ２ 21.0g / m or more ２ The roll product packaging according to claim 1 or 2, characterized in that it is as follows:

7. The roll product packaging according to claim 1 or 2, characterized in that the film has a tensile elongation at break of 200% or more and 480% or less in the MD direction, and a tensile elongation at break of 310% or more and 690% or less in the TD direction.

8. The roll product packaging according to claim 1 or 2, characterized in that the film has a value of (tensile breaking strength in the MD direction ÷ roll density) of 105 or more and 320 or less.

9. The roll product packaging according to claim 1 or 2, characterized in that the thickness of the nylon is 35% or less of the thickness of the film.

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