JP2023150253A - Sanitary paper roll package - Google Patents

Abstract

To provide a sanitary paper roll package which has good re-packaging property, and in which a sanitary paper roll is packaged with a packaging base material mainly based on paper.SOLUTION: In a sanitary paper roll package in which a plurality of sanitary paper rolls are packaged with a packaging base material, the packaging base material has layer constitution including a paper base material and a seal layer for encapsulating the package. A thickness of the packaging base material is 35 μm or more and 80 μm or less, a burst strength of the packaging base material is 105 kPa or more and 190 kPa or less, and a geometric average breaking elongation of a breaking elongation of the packaging base material in a height direction parallel to an axial direction of the sanitary paper roll included in the package and a breaking elongation of the packaging base material in a width direction perpendicular to the axial direction of the sanitary paper roll included in the package is 2.9% or more and 6.0% or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sanitary paper roll package in which a plurality of sanitary paper rolls are wrapped with a packaging base material.

Generally, sanitary paper rolls such as kitchen paper rolls and toilet rolls are sold in a plurality of packages wrapped in a packaging base material. It is desired that such a package can be repackaged after opening and taking out a part of the packaged article so that the remaining sanitary paper roll can be stored cleanly (Patent Document 1). This demand is particularly noticeable for kitchen paper rolls.

In recent years, the problem of plastic waste has become increasingly serious worldwide, and it is desired to replace plastic packaging with other materials in order to improve the global environment. In the field of packaging for paper products, packaging in which paper products are wrapped in wrapping paper has been proposed, replacing the packaging material from plastic film to one mainly made of paper (Patent Document 2).

Japanese Patent Application Publication No. 2003-104449 JP2021-172415A

However, when the packaging base material is replaced with a base material mainly made of paper from plastic film, paper is thicker and more difficult to bend than film, so compared to film, the number of sanitary paper rolls contained in the package is It is difficult to repackage the remaining sanitary paper roll with a packaging base material after a part of it is taken out, resulting in poor storage properties.

Therefore, in the present invention, the sanitary paper roll is made of a packaging base material mainly made of paper, which allows the remaining sanitary paper roll to be easily rewrapped after a part of the plurality of sanitary paper rolls contained in the package is taken out. The purpose is to provide a wrapped sanitary paper roll package.

As a result of intensive studies to solve the above problems, the present inventors have developed a sanitary paper roll package in which a plurality of sanitary paper rolls are wrapped in a packaging base material, the packaging base material being a paper base material and a packaging base material. , a sealing layer for sealing the package, the thickness of the packaging base material is 35 μm or more and 80 μm or less, and the bursting strength of the packaging base material is 105 kPa or more and 190 kPa or less. , the elongation at break in the height direction of the packaging base material parallel to the axial direction of the sanitary paper roll included in the packaging body, and the width direction of the packaging base material perpendicular to the axial direction of the sanitary paper roll included in the packaging body. It has been found that the above problem can be solved by a sanitary paper roll package whose geometric mean elongation at break is 2.9% or more and 6.0% or less.

Specifically, the present invention has the following configuration.
[1] A sanitary paper roll package in which a plurality of sanitary paper rolls are wrapped with a packaging base material,
The packaging base material has a layered structure including a paper base material and a sealing layer for sealing the packaging body,
The thickness of the packaging base material is 35 μm or more and 80 μm or less,
The bursting strength of the packaging base material is 105 kPa or more and 190 kPa or less,
The elongation at break in the height direction of the packaging base parallel to the axial direction of the sanitary paper roll included in the package and the width direction of the packaging base perpendicular to the axial direction of the sanitary paper roll included in the package. A sanitary paper roll package characterized in that the geometric mean elongation at break is 2.9% or more and 6.0% or less.
[2] The sanitary paper roll package according to [1], wherein the packaging base material has an air permeability of 1000 seconds or more.
[3] The sanitary paper roll package according to [1] or [2], wherein the packaging base material has a bending stiffness in the width direction of 8 μNm or more and 35 μNm or less.
[4] The sanitary paper roll according to any one of [1] to [3], wherein the surface of the packaging base material in contact with the sanitary paper roll included in the package has a smoothness of 100 seconds or more. packaging.
[5] The sanitary paper roll package according to any one of [1] to [4], wherein the packaging base material has a transparency of 60% or more.
[6] The sanitary paper roll package according to any one of [1] to [5], wherein the paper base material is glassine paper.
[7] The sanitary paper roll package according to any one of [1] to [6], wherein the packaging format of the package is a caramel packaging format.

According to the present invention, the sanitary paper roll is made of a paper-based packaging base material, which allows the remaining sanitary paper roll to have good repacking properties after a part of the plurality of sanitary paper rolls contained in the package is taken out. It is possible to provide a sanitary paper roll package wrapped with

It is a figure showing a sanitary paper roll package concerning an embodiment of the present invention. It is a figure showing one aspect of the packaging base material concerning an embodiment of the present invention. It is a figure which shows another aspect of the packaging base material based on embodiment of this invention. It is a figure which shows the example of opening operation and repackaging operation of a sanitary paper roll package. It is a figure which shows another example of opening operation and repackaging operation of a sanitary paper roll package.

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments and drawings are provided for illustrative purposes and are not intended to limit the invention.

<First embodiment>
[Sanitary paper roll packaging]
FIG. 1 is a schematic perspective view of a sanitary paper roll package according to a first embodiment of the present invention. In the first embodiment of the present invention, a sanitary paper roll package (hereinafter also simply referred to as a "package") 1 includes a plurality of sanitary paper rolls 2 and a packaging base material 10 for packaging the plurality of sanitary paper rolls 2. and, including.

[Sanitary paper roll]
In this specification, a sanitary paper roll is a rolled sanitary paper product obtained by winding a long sanitary paper sheet such as toilet paper, kitchen paper, or hand towel into a roll. Examples of sanitary paper rolls include, but are not limited to, toilet rolls, kitchen paper rolls, hand towel rolls, and the like.

The sanitary paper roll may be a one-ply product in which only one sanitary paper sheet is wound into a roll, or it may be a multi-ply product in which two or more sanitary paper sheets are rolled up in a rolled-up state. It's okay. Depending on the required quality, the sanitary paper sheet may be embossed to give surface irregularities, perforated to give perforations for separation, etc., and information such as patterns, logos, messages, etc. can be added. It may also be printed with figures or characters for this purpose.

Sanitary paper sheets are obtained by paper-making a slurry containing a pulp component, which is a fiber raw material. Pulp components include wood pulp, non-wood pulp, and waste paper pulp. Various chemicals such as paper strength agents and antifoaming agents may be added as optional ingredients for the required quality and operational stability. Any known paper machine can be used for paper making. In the papermaking process, the sanitary paper sheet may be subjected to crepe processing or the like. Calendar treatment may be performed during the papermaking process or any subsequent process.

In the example shown in FIG. 1, the sanitary paper roll 2 is a kitchen paper roll. The packaging base material 10 wraps two kitchen paper rolls 2 together.

In the present invention, the number (number) of sanitary paper rolls 2 packaged in the package 1 is determined by the ease of handling of the package 1, depending on the dimensions and weight of the sanitary paper roll 2, the strength (tearability) of the packaging base material 10, etc. , product sales strategy, etc. The number of sanitary paper rolls 2 packed in the package 1 is preferably an even number, more preferably four, and even more preferably two.

[Packaging base material]
The packaging base material 10 according to the embodiment of the present invention includes a paper base material 100 and a seal layer 110 for sealing the package.

2 and 3 are diagrams each showing one non-limiting example of a possible embodiment of the packaging base material 10 that constitutes the package 1 shown in FIG. 1. In the example shown in FIG. 1, the packaging format of the package 1 is a so-called caramel packaging format, which is known for individual packaging of soft candy such as caramel, packaging for boxed cigarettes, and the like.

FIG. 2A is a schematic developed view of the packaging base material 10, and is a plan view of the packaging base material 10 seen from the surface (hereinafter also referred to as "surface") that is the outer surface side of the package 1. 2(b) is a schematic cross-sectional view taken along the line IIb-IIb of the packaging base material 10 shown in FIG. 2(a), and FIG. 2(c) is a schematic sectional view of the packaging base material 10 shown in FIG. ) is a schematic cross-sectional view taken along the line IIc-IIc of the packaging base material 10 shown in FIG.

Referring to FIG. 2(a), the packaging base material 10 of this example is a rectangular OPQR. A sealant for sealing the package 1 is applied to the hatched area in the figure.

Referring to the cross-sectional views of FIGS. 2(b) and 2(c), the sealant applied on the paper base material 100 forms a sealing layer 110, and the packaging base material 10 and a sealing layer 110. In this example, the sealing layer 110 completely covers one side of the paper base material 100. In the figures, the thickness of each layer and each dimension are shown schematically and are not to scale.

FIG. 3 is a diagram showing an example of a possible embodiment of the packaging base material 10 constituting the package 1 shown in FIG. 1, which is different from the embodiment shown in FIG. 2.

(a) to (c) in FIG. 3 correspond to (a) to (c) in FIG. 2, respectively. That is, (a) of FIG. 3 is a schematic developed view of the packaging base material 10, and is a plan view of the packaging base material 10 viewed from the surface (front surface) that is the outer surface side of the package 1. FIG. 3(b) is a schematic cross-sectional view of the packaging base material 10 shown in FIG. 3(a) taken along line IIIb-IIIb, and FIG. ) is a schematic cross-sectional view taken along the line IIIc-IIIc of the packaging base material 10 shown in FIG.

FIG. 3 differs from FIG. 2 in the area in which the sealing layer 110 is provided in the packaging base material 10. In the embodiment shown in FIG. 3, the sealing layer 110 covers the area of the side end of the packaging base material 10 indicated by a rectangle OPP ₁ O ₁ and the packaging region indicated by a rectangle OO ₂ R ₂ R, which is indicated by hatching in the figure. They are provided in the upper end region of the base material 10 and in the lower end region of the packaging base material 10 indicated by a rectangle PP ₂ Q ₂ Q. Further, in the figure, the sealing layer 110 is not provided in the area indicated by the rectangle O ₃ P ₃ Q ₂ R ₂ .

Referring to the cross-sectional views of FIGS. 3(b) and 3(c), packaging base material 10 has a layered structure including a paper base material 100 and a sealing layer 110, and the sealing layer 110 is paper-based. One side of the material 100 is partially covered. In the figures, the thickness of each layer and each dimension are shown schematically and are not to scale.

In light of the package 1 of FIG. 1, in any of the embodiments shown in FIGS. 2 and 3, a portion of the area indicated by the rectangle OPP ₁ O ₁ and a portion of the area indicated by the rectangle RQQ1R1 in the packaging base material 10. (side end portions) (region indicated by reference numeral 12S in the figure) are overlapped and joined via a seal layer 110 provided in a region indicated by rectangle OPP ₁ O ₁ . In addition, the parts (upper and lower ends) of the area indicated by rectangles OO ₂ R ₂ R and PP ₂ Q ₂ Q (areas indicated by symbols 12T and 12B in the figure) are folded, and the rectangle OO ₂ R ₂ R , PP ₂ Q ₂ Q through a sealing layer 110 provided in the region. Therefore, the side end portions and upper and lower end portions of the packaging base material 10 described above become portions that substantially contribute to sealing the package 1.

Hereinafter, in this specification, the end portions (side ends and upper and lower ends) of the packaging base material 10 that substantially contribute to the sealing of the package 1 as described above will be referred to as the "sealing portion of the package". Alternatively, it is referred to as the "joint part of the packaging base material" and is represented by the code 12 (12S, 12T, 12B), and the other parts are referred to as the "unsealed part of the package" or the "non-joint part of the packaging base material". and is represented by the symbol N12.

In the packaging base material 10 according to the embodiment of the present invention, the area where the seal layer 110 is formed is not limited to the examples shown in FIGS. 2 and 3, and as long as it includes the sealing part 12 of the package, It may be formed in any area on the material 100.

[Paper base material]
In the embodiment of the present invention, various paper base materials can be used as the paper base material 100 of the packaging base material 10 of the package 1.

The paper base material 100 can be manufactured by using a pulp component such as wood pulp, non-wood pulp, or waste paper pulp such as deinked pulp as a main raw material and making paper using a paper machine using a known method.

One kind of pulp component may be used alone, or two or more kinds of pulp components may be mixed. Since these pulp components greatly affect the quality of the paper base material, they are appropriately blended in predetermined types and blending ratios depending on the required quality.

For example, softwood kraft pulp (NKP) and/or hardwood kraft pulp (LKP) is preferably used in a ratio of 0 to 60:100 to 40, more preferably 20 to 60:80 to 40, and still more preferably 40 to 60:60 to 40. It may be used at a blending ratio (mass%) of

Softwood kraft pulp generally has longer fiber lengths than hardwood kraft pulp. Therefore, as the blending ratio of softwood kraft pulp increases in the pulp raw material, the paper strength of the resulting paper base material 100 generally increases. For example, it is possible to obtain a paper base material 100 that has high tensile strength in the MD direction (also referred to as papermaking direction or longitudinal direction (T direction)) and is difficult to tear even when force is applied in the MD direction.

The paper base material 100 that can be used as the packaging base material 10 of the package 1 has the following properties: It may be determined by the appearance (transparency, whiteness), the repackability of the package 1 after opening the package 1, etc.

Various commonly used chemicals may be added to the paper base material 100 as optional components in order to achieve required quality and stability of operation during manufacturing. Examples of optional components include dry paper strength agents, wet paper strength agents, sizing agents, bulking agents, dyes, fragrances, dispersants, drainage improvers, pitch control agents, retention aids, and the like.

Specific examples of the paper base material 100 suitably applicable to the embodiments of the present invention include, but are not limited to, transparent paper such as glassine paper, and glossy paper such as pure white paper. .

[Glassine paper]
Glassine paper is a transparent thin paper made by highly beating chemical pulp and passing it through a calendar, applying heat and pressure to close the gaps between the fibers. Glassine paper has high smoothness, gloss, high density, and high air permeability (i.e., it takes a long time for a given amount of air to pass through a given area of the paper under a given pressure, in other words) As a result, it has properties such as low air permeability) and translucence.

In general, "transparent" refers to the ability to see through something on the other side or inside an object, and "semi-transparent" refers to a low degree of transparency, an intermediate state between transparent and opaque, and It refers to the fact that the shape of an object beyond the object cannot be clearly seen, but the color, brightness, etc. can be seen. Also, "opaque" refers to the inability to see things on the other side through it. In this specification, "transparent" and "translucent" are collectively referred to as simply "transparent".

Furthermore, "transparency" refers to the rate at which light passes through paper, expressed as a percentage of the amount of incident light. The higher the transparency value, the more clearly things on the other side or inside can be seen through.

As one preferable aspect of the embodiment of the present invention, in the example shown in FIG. (Two kitchen paper rolls) are visible through the packaging base material 10.

From the viewpoint of visibility of the sanitary paper roll 2, which is the object to be packaged, from the outside of the package 1, in one preferred embodiment of the present invention, the transparency of the packaging base material 10 is 60% or more, preferably It is 65% or more, more preferably 70% or more, and even more preferably 75% or more. When the transparency of the packaging base material 10 is 60% or more, the condition of the packaged object 2 contained in the package 1 (for example, the type, quantity, color, pattern, shape (presence or absence of printing or embossing) of the packaged object 2) etc.) are easy to check.

One way to achieve such transparency of the packaging base material 10 is to use a highly transparent paper base material 100. In one preferred aspect of the embodiment of the present invention, the transparency of the paper base material 100 is 60% or more, preferably 65% or more, more preferably 70% or more, and still more preferably 75% or more. be. Examples of highly transparent paper applicable to the paper base material 100 include glassine paper and parchment paper, but are not limited thereto.

The transparency of the paper base material 100 and the packaging base material 10 can be measured using a diffused light transmittance meter DOT-5 (manufactured by Murakami Color Research Institute) in accordance with ISO5-2. Note that the measurement of the transparency of the packaging base material 10 is performed on the region of the non-bonded part (unsealed part of the package 1) N12 of the packaging base material 10.

[Effects of the embodiment using glassine paper]
By using glassine paper as the paper base material 100 of the packaging base material 10 in this embodiment, the following effects can be achieved, for example.
(1) Since the glassine paper is transparent, in the appearance of the package 1, in the area of the unsealed part N12 of the package 1, the transparent glassine paper 100 (and the transparent glassine paper provided thereon, if any) Through the sealing layer 110), the sanitary paper roll 2 contained in the package 1 can be easily seen and identified (there is internal visibility). For example, the type, quantity, color, pattern, shape (for example, presence or absence of printing or embossing), etc. of the sanitary paper roll 2 can be confirmed from the outside of the package 1 (see FIG. 1).
(2) Since glassine paper has high air permeability, the sanitary paper roll 2, which is an object to be packaged wrapped in the packaging base material 10, is less susceptible to external moisture, external odor, and the like.

[Parchment paper]
"Parchment paper" is a transparent paper in which some of the cellulose fibers in the base paper have changed into amorphous amyloid, and the base paper, which mainly consists of cellulose fibers, is treated with acids such as sulfuric acid, hydrochloric acid, formic acid, and acetic acid. You can get it by doing this. For example, parchment paper can be made by a series of steps in which base paper is immersed in sulfuric acid, neutralized and/or washed with water repeatedly, and dried. The immersion time cannot be absolutely limited, but can be appropriately adjusted in consideration of the thickness, density, size, cleaning ability, drying ability, etc. of the base paper.

By immersing base paper made of pulp fibers made of cellulose in sulfuric acid, the cellulose swells, hydrolyzes, and dissolves. Dissolved cellulose becomes a viscous, translucent gelatinous substance that coats the surface of the base paper, strongly binding the fibers together, and filling the pores and voids in the paper layers, forming an extremely dense paper layer structure. . As a result, diffuse reflection of light within the paper layer is reduced and transparency is promoted.

A gelatinous substance produced by hydrolysis of cellulose undergoes a neutralization and/or water washing process to stop the hydrolysis reaction and becomes hydrated cellulose. Therefore, cellulose, which is chemically the same component as the base paper, closes the voids in the paper, improving transparency and eliminating minute white spots that are presumed to be caused by the formation or voids in the base paper layer. The unevenness is reduced, and as a result, a base paper without unevenness and having uniform transparency can be obtained.

It is also possible to make paper with higher transparency by incorporating fine fibrous cellulose with an average fiber width of 2 to 50 nm, which is obtained by chemically treating or defibrating lignocellulose raw materials, into the pulp used.

[Effects of the embodiment using parchment paper]
By using parchment paper as the paper base material 100 of the packaging base material 10, an internal visibility effect can be achieved similarly to the case where glassine paper is used. That is, in the appearance of the package 1, the transparent parchment paper 100 (and the transparent seal layer 110 provided thereon, if present) of the unsealed part of the package 1 is passed through, and the package 1 is packaged. It is possible to easily identify the sanitary paper roll 2 by looking through the watermark. For example, the type, quantity, color, pattern, shape (for example, presence or absence of embossing), etc. of the sanitary paper roll 2 can be confirmed from the outside of the package 1 (see FIG. 1).

[Single gloss paper]
In one aspect of this embodiment, the paper base material 100 may be single gloss paper. Single-gloss paper is paper that has been made smoother and more glossy on one side, and has two types: a glossy surface (highly smooth surface) with relatively high smoothness and a smooth feel, and a glossy surface (highly smooth surface) with relatively low smoothness and a rough feel. It has a non-glossy surface (low smooth surface).

Single gloss paper is produced by making paper from pulp raw materials using a paper machine equipped with a mirror-finished Yankee dryer, and then drying the wet paper by pressing it against the mirror-finished surface of the Yankee dryer. be able to. The smoothness and gloss of the surface in contact with the Yankee dryer will be higher compared to the smoothness and gloss of the surface not in contact with the Yankee dryer, and in this way paper substrates with glossy and non-glossy surfaces (single gloss Paper) 100 can be manufactured.

For example, glassine paper is made from highly beaten chemical pulp and is produced by passing it through a calendar and applying heat and pressure to crush the gaps between the fibers, resulting in high density and smoothness. However, with single-gloss paper, the smoothness of the surface in contact with the Yankee dryer is improved by pressing wet paper against the mirror-finished surface of the Yankee dryer and drying it. With single-gloss paper, calendering is not performed or the conditions are mild, so the interfiber bonds of the pulp fibers contained in the base paper are relatively hard to break, so it can be produced at a relatively low cost and on the same level as glassine paper. It is possible to obtain paper with a certain degree of strength.

[Pure blank paper]
In one aspect of an embodiment of the present invention, paper substrate 100 may be pure white paper. Pure white paper is a type of glossy paper mentioned above, is manufactured using pulp with high whiteness such as bleached pulp, and has high whiteness.

[Whiteness]
The whiteness of pure white paper is, for example, 80% or more, and is, for example, 90% or more. Whiteness can be measured according to JIS P8148:2005 (ISO2470).

[Effects of the embodiment using pure white paper]
The aspect of using pure white paper as the paper base material 100 is that in addition to the effects explained in the above-mentioned single-gloss paper section, its high whiteness provides a high-quality appearance, and when printing is applied to the packaging base material 10. This has the effect that the background of the print becomes white and the visibility of the print is improved.

[Seal layer]
The seal layer 110 is a layer containing a sealant.

[Sealant]
As the sealant applicable to the embodiment of the present invention, any sealant known in the technical field that can bond the packaging base material 10 and seal the package 1 can be used. . As the sealing agent, any material that exhibits heat-sealing properties, ie, a heat-sealing agent, or any material that exhibits adhesiveness other than the heat-sealing agent, ie, an adhesive, can be used.

As the heat sealing agent, for example, a polyolefin resin or other thermoplastic resin can be used, and among these, it is preferable to use a polyethylene resin. Examples of such materials include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene - Ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ionomer, amorphous polyester, polypropylene, styrene-acrylic copolymer, propylene-ethylene copolymer (preferably copolymers with an ethylene content of 10 mol% or less), or polypropylene resins obtained by grafting or copolymerizing unsaturated carboxylic acids, unsaturated carboxylic acid anhydrides, ester monomers, etc. to polypropylene, medium density polyethylene, Examples include high-density polyethylene. These materials may be used alone or in combination of two or more.

Examples of adhesives include water-soluble polymers such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, carboxyethylcellulose, polyvinylpyrrolidone, and polyvinyl alcohol, as well as derivatives thereof, and Mention may be made of mixtures of these.

[Method of forming seal layer]
The seal layer 110 can be formed, for example, using a commonly used method such as those listed below.
(1) A method of forming a film of a thermoplastic resin such as a polyolefin resin or a composition containing a thermoplastic resin on the paper base material 100 by extrusion.
(2) A method of attaching a film made of a thermoplastic resin or a film containing a thermoplastic resin to the paper base material 100 using a known heat-seal processing device (lamination processing device).
(3) Water-based heat sealing agent in which a thermoplastic resin or thermoplastic resin composition is dissolved or dispersed in water, or a solvent-based heat sealing agent in which a thermoplastic resin or thermoplastic resin composition is dissolved or dispersed in a solvent, water-soluble A method of coating a polymer, a derivative thereof, or a mixture thereof on a paper base material 100 by a known method such as roll coating, gravure roll coating, kiss coating, etc.

By forming the seal layer 110 on the paper base material 100 as described above, the packaging base material 10 according to the embodiment of the present invention is obtained.

[Example of packaging manufacturing method]
With reference to FIGS. 1 and 2, non-limiting examples of packaging formats and methods of manufacturing the package 1 applicable to the package 1 according to the first embodiment will be described. Note that even when the packaging base material 10 shown in FIG. 3 is used instead of the packaging base material 10 shown in FIG. 2, the package 1 can be manufactured by the same method.

The package 1 shown in FIG. 1 is a so-called caramel packaging type package, and can be manufactured, for example, through the steps shown below.

(Step 1) As shown in FIG. 2, a sealant for sealing the package 1 is applied to a predetermined area of the packaging base material 10 (the area shown by hatching in the figure) to form a sealing layer 110. A step of preparing a rectangular OPQR packaging base material 10.

In the example of FIG. 2, the MD direction (longitudinal direction) of the packaging base material 10 and, by extension, the MD direction (longitudinal direction) of the paper base material 100 are made to match the direction A in the figure, but in this embodiment However, the direction in which the packaging base material 10 (paper base material 100) is used is not limited to this. The direction in which the packaging base material 10 (paper base material 100) is used depends on the processing suitability when manufacturing the package 1, the repackability after opening (bendability, strength against bending), and the direction in which the package 1 is made. It may be determined in accordance with the directionality caused by the fiber orientation of the paper from the viewpoint of posture, strength (tearability), etc., or from the viewpoint of other desired characteristics.

(Step 2) The sanitary paper rolls (two kitchen paper rolls) 2, which are the objects to be packaged, are placed so that they face the back surface of the packaging base material 10 (the surface that becomes the inner surface of the package 1), and in the axial direction of the rolls. A step of arranging the arrow A to coincide with the direction A shown by arrow A in the figure.

(Step 3) Wrap the packaged object 2 in the packaging base material 10 so that the surface of the packaging base material 10 (the surface that becomes the outer surface side of the package 1) becomes the outer surface, and wrap the packaging base material 10 at both ends (rectangular shape). A step of overlapping the side end region of the packaging base material 10 indicated by OPP ₁ O ₁ and the side end region of the packaging base material 10 indicated by the rectangle RQQ ₁ R ₁ ) to package it into a cylindrical shape.

Through this step 3, both ends 12S of the packaging base material 10 are joined via the seal layer 110 provided on the surface of the paper base material 100 so that the front and back surfaces of the paper base material 100 are in contact with each other. , sealed.

Hereinafter, in this specification, the bonding method in which different surfaces (front and back surfaces) of the paper base material 100 are brought into contact with each other and bonded together will also be referred to as "overlapping bonding" in this specification.

(Step 4) Next, at each of the open end portions (upper and lower end portions) 12T and 12B of the cylindrical packaging formed in Step 3, the portion of the packaging base material 10 protruding from the circumferential surface of the sanitary paper roll 2, A step of wrapping the sanitary paper roll 2 by folding them together to form two pairs of opposing flap-like parts and joining them along the end surfaces of the sanitary paper roll 2.

In FIG. 2A, the area of the upper end 12T of the packaging base material 10 indicated by the rectangle OO ₂ R ₂ R and the area of the lower end 12B of the packaging base material 10 indicated by the rectangle P ₂ PQQ ₂ are shown in the figure. A flap-shaped portion is formed by folding along the mountain fold line UFL (dashed line) and the valley fold line DFL (dotted chain line). By joining the flap portions through the seal layer 110 provided on the surface of the paper base material 100, the package 1 in the state shown in FIG. 1 is obtained.

In this way, the upper and lower ends 12T and 12B of the packaging base material 10 are mainly joined and sealed via the respective seal layers 110 so that the surfaces of the paper base material 100 are in contact with each other. Hereinafter, in this specification, the bonding method in which the same surfaces of the paper base material 100 are brought into contact with each other and bonded together will also be referred to as "gassho bonding" in this specification.

In addition, in this specification, the "upper and lower ends" of the "upper and lower ends" of the packaging base material 10 and the "upper and lower end surfaces" of the packaging body 1 refer to both ends in the direction A indicated by arrow A in the figure; "(Both) side ends" of the base material 10 refer to (both) ends of the wrapping of the packaging base material 10 in a direction intersecting the A direction, such as the B direction shown by arrow B in FIG. shall point. Further, in this specification, the A direction shown by arrow A in the drawings is also referred to as the "height direction", and the B direction shown by arrow B in the drawings is also called the "width direction".

Through the above steps, in this embodiment which adopts the caramel packaging format, the sealing layer 110 is provided on the outer side (surface) of the package 1, and both stacked sealing and gassho sealing are performed. . As a result, the package 1 has a sealing part 12S in which both ends of the packaging base material 10 are overlapped and joined so that the front and back surfaces of the paper base material 100 are in contact with each other, and the upper and lower ends of the packaging base material 10. Each of the parts is sealed by a sealing part 12 having sealing parts 12T and 12B which are folded and joined so that the surfaces thereof mainly face each other.

In addition, in the manufacturing process illustrated above, the packaging base material 10 was prepared in advance and cut into a rectangular shape of a predetermined size in plan view, and one package 1 was manufactured, but the method for manufacturing the package 1 is limited to this. Not done. For example, the packaging base material 10 is prepared in the form of a long continuous sheet, and in a subsequent step, the packaging base material 10 is cut while or after the sanitary paper roll 2 is placed on the packaging base material 10. The package 1 may be manufactured using the same method.

In the embodiment of the present invention, the ends of the packaging base material 10 overlapped in the sealing portions 12 (12S, 12T, 12B) are joined by a sealant contained in the seal layer 110 of the packaging base material 10. When the sealing agent is a heat sealing agent, they are joined by heat sealing (thermal fusion), and when the sealing agent is an adhesive, they are joined by adhesion.

When the sealing agent is a heat sealing agent, a known heat sealer can be used for heat sealing the heat sealing layer 110. Through the heat sealing process, heat and pressure are applied to the area of the sealing part 12 (12S, 12T, 12B) where the packaging base material 10 is overlapped, and the heat sealing agent of the heat sealing layer 110 in the area is softened and melt. Phenomena such as micro biting of the softened heat sealing agent and mixing and integration of the molten heat sealing agent occur, and after cooling, the sealing portion 12 (12S, 12T, 12B) to which the heat sealing layer 110 is firmly adhered becomes can get.

When the sealant is an adhesive, a certain amount of time is required for the adhesive to dry, but when the sealant is a heat sealant, it is preferable because there is no need to take drying time into consideration.

[Opening and repackaging/repackability]
With reference to FIGS. 4 and 5, opening and repackaging operations of the package 1 and repackaging properties will be described.

(Opening and repackaging)
FIG. 4 is a schematic diagram illustrating an example of opening and repackaging the package 1.

FIG. 4 (1) shows the package 1 before opening.

(2) in FIG. 4 shows an example of an operation for opening the package 1. In this example, the package 1 is opened by peeling off the bond of the packaging base material 10 at the sealing part 12 of the package 1.

First, the bonding of the packaging base material 10 by the seal layer 110 is peeled off at the sealing part (joint part of the packaging base material 10) 12 of the package 1 so that it is sufficient to take out the sanitary paper roll 2. At this time, the upper end, side end, and lower end 12 (12T, 12S, 12B) of the packaging base material 10 may be completely or partially removed.

Next, a part of the plurality of sanitary paper rolls 2 contained in the package 1 (in this example, one of the two kitchen paper rolls) is taken out from the package 1.

(3) of FIG. 4 shows an example of the package 1 that has been repackaged.

First, in (2) of FIG. 4, the remaining sanitary paper roll 2 is re-wound with the packaging base material 10 so that the space inside the package 1 created by taking out the sanitary paper roll 2 is eliminated. Next, the upper and lower ends 12 (12T, 12B) of the packaging base material 10 are bent along the end surface of the sanitary paper roll 2 to close the opening of the package 1. In this way, the packaged object (sanitary paper roll) 2 is repackaged. The repackaging is performed so that the sanitary paper roll 2 contained within the package 1 rewrapped by the packaging base material 10 is not exposed in order to ensure good storage properties of the sanitary paper roll 2. In this way, a repackaged package 1 as shown in FIG. 4(3) is obtained.

FIG. 5 is a schematic diagram illustrating another example of the operation of opening and repackaging the package 1.

In the example of FIG. 5, (1) of FIG. 5 shows the package 1 before opening, (2) of FIG. 5 shows an example of the opening operation of the package 1, and (3) of FIG. An example of repackaging the package 1 is shown.

In the example of FIG. 5, as shown in FIG. 5(2), the package 1 is opened mainly by tearing the packaging base material 10 at the unsealed portion N12 of the package 1. This is different from the example in FIG. The repackaging operation in the example of FIG. 5 is performed in substantially the same manner as in the example of FIG. 4, and therefore, redundant explanation will be omitted.

As described above, in the embodiment of the present invention, the packaging body 1 may be opened by peeling off the bond of the sealing part 12, and the packaging base material 10 may be opened mainly in the region of the unsealed part N12. Alternatively, it may be performed by a combination of peeling off the bond in the sealing part 12 and breaking the packaging base material 10 mainly in the region of the non-sealing part N12.

In any case, the sanitary paper roll 2 is repackaged so that the sanitary paper roll 2 contained therein is not exposed from the package 1 rewrapped by the packaging base material 10 for good storage properties. It is preferable.

(Repackability)
The packaging substrate 10, which is mainly paper, is generally thicker and more difficult to bend than conventional packaging substrates such as films. Therefore, when repackaging, it is difficult to repackage with the packaging base material 10 so as not to expose the remaining sanitary paper rolls 2 after taking out some of the multiple sanitary paper rolls 2 included in the package 1. It tends to become.

In addition, with the packaging base material 10 mainly made of paper, even if the remaining sanitary paper roll 2 can be once repackaged with the packaging base material 10 so as not to be exposed, the packaging body 1 may deteriorate over time after repackaging. The package may be opened naturally and the packaged object 2 may be exposed. If exposure occurs, storage properties will be poor.

In order to solve this problem, the present invention provides a paper-based packaging base that allows for good repackaging of the remaining sanitary paper rolls after a portion of the plurality of sanitary paper rolls contained in the package is taken out. The object of the present invention is to provide a sanitary paper roll package in which a sanitary paper roll is wrapped with a sanitary paper roll.

In this specification, the term "repackability" refers to the ease with which the object 2 to be packaged can be repackaged using the packaging base material 10 after the package 1 is opened. The ease of repackaging includes the bendability (processability) of the packaging base material 10 and the difficulty of opening the package over time after repackaging.

As a result of intensive studies to solve the above problems, the present inventors found that if the thickness of the packaging base material 10 is simply made thinner in order to improve repackaging properties, the thickness of the packaging base material 10 The packaging base material 10 becomes easier to tear as the basis weight decreases, and the thickness of the packaging base material 10, the bursting strength of the packaging base material 10, and the geometric mean elongation at break of the packaging base material 10. It has been found that the above problem can be solved by controlling the temperature within a predetermined range.

[Basic weight]
In this specification, the basis weight of the packaging base material 10 and the basis weight of the paper base material 100 are the basis weights per sheet (g/m ² ) measured according to JIS P8124. Further, the basis weight of the seal layer 110 can be determined by subtracting the basis weight of the paper base material 100 from the basis weight of the packaging base material 10 in the area where the seal layer 110 is provided. The basis weight of the packaging base material 10 is measured at the non-sealed part (non-joined part of the packaging base material 10) N12 of the package 1.

[Basic weight of packaging base material]
In the embodiment of the present invention, the basis weight of the packaging base material 10 is, for example, preferably 39 g/m ² or more and 65 g/m ² or less, more preferably 45 g/m ² or more and 60 g/m ² or less. .

When the basis weight of the packaging base material 10 is low, the basis weight of the paper base material 100 included in the packaging base material 10 is generally low, there are few constituent pulp fibers, there are few bonds between fibers, and the strength is low and tends to tear easily. It is in. Therefore, from the viewpoint of the tear resistance of the packaging base material 10, it is preferable that the basis weight of the packaging base material 10 is high.

On the other hand, if the basis weight of the packaging base material 10 is high, the paper thickness or density will generally be high, and the pliability and softness of the packaging base material 10 will be reduced, so that when the packaging body 1 is manufactured or repackaged. The packaging base material 10 is difficult to bend, and the processability and repackaging properties at the time of manufacturing the package 1 tend to decrease.

In addition, if the sealing layer is a heat-sealing layer due to increased paper thickness, heat transfer during the heat-sealing process will be insufficient, and the heating temperature of the heat-sealing layer will decrease, resulting in poor bonding strength. Sometimes you can't get it. Therefore, from the viewpoints of processability and repackaging properties of the package 1 and heat sealability (adhesiveness) in the sealing part 12 of the package 1, the lower basis weight of the packaging base material 10 is preferable.

When the basis weight of the packaging base material 10 is within the above-mentioned range, the packaging base material 10 has appropriate strength and is difficult to tear, and is suitable for processing during manufacturing of the packaging body 1 and heat sealing in the sealing part 12. can be guaranteed.

[Basic weight of seal layer]
In the embodiment of the present invention, the basis weight of the seal layer 110 is preferably, for example, 5 g/m ² or more and 25 g/m ² or less. A sealing layer formed by extrusion of a thermoplastic resin or a composition containing a thermoplastic resin on a paper base material, and a film made of a thermoplastic resin or a film containing a thermoplastic resin are laminated using a processing device. In the case of the attached seal layer, the basis weight of the seal layer 110 is more preferably 10 g/m ² or more and 20 g/m ² or less. Further, when a heat sealing agent or an adhesive is applied onto a paper base material, the basis weight of the sealing layer 110 is more preferably 5 g/m ² or more and 10 g/m ² or less.

When the basis weight of the sealing layer 110 is low, the thickness (amount) of the sealing layer (adhesive or heat sealing agent) that can participate in bonding between the packaging base materials 10 to be bonded is generally thin (small). , good adhesion (sealability) may not be obtained in the sealing portion 12.

Furthermore, as the basis weight of the seal layer 110 increases, the seal layer 110 generally becomes thicker. When the sealing layer 110 is a heat-sealing layer, if the sealing layer 110 becomes thick, heat transfer may become insufficient during the heat-sealing process. In that case, it becomes difficult to obtain an anchoring effect due to melting, fusion, or infiltration of the heat sealing agent into the recessed portions, and good bonding strength may not be obtained, resulting in poor sealing performance.

When the basis weight of the sealing layer 110 is within the above-mentioned range, adhesiveness and heat sealability in the sealing portion 12 can be guaranteed.

[Thickness of packaging base material (paper thickness)]
In the embodiment of the present invention, the thickness (paper thickness) 10th of the packaging base material 10 is 35 μm or more and 80 μm or less, preferably 40 μm or more and 75 μm or less, and more preferably 45 μm or more and 65 μm or less.

The thickness (paper thickness) of the packaging base material can be measured in accordance with ISO534:2011. The pressure on the pressure surface in the measurement is 100 kPa±10 kPa. The measurement is performed on the non-sealed portion N12 of the package 1, avoiding the sealed portion 12.

As mentioned above, with reference to FIG. 1 and FIG. 2 or FIG. The sealed portion (joint portion of the packaging base material 10) 12 (12S, 12T, 12B) of the package 1, which is the area where the body 1 is sealed, and the non-sealed area of the package 1, which is the other area. It has a stop part (non-joined part of the packaging base material 10) N12.

The thickness 10th of the packaging base material 10 is the thickness measured at the non-sealed part (non-joined part of the packaging base material 10) N12 of the packaging body 1. In the package 1 shown in FIG. 1, the side surface of the package 1 is wound in the circumferential direction of the sanitary paper roll 2 (in the B direction perpendicular to the A direction indicated by arrow A, which is the axial direction). The thickness of the packaging base material 10 is measured for a region of the packaging base material 10 that does not contribute to the sealing of the package 1. This measurement area corresponds to the area indicated by the rectangle O ₃ P ₃ Q ₃ R ₃ in the schematic development diagrams of the packaging base material 10 in FIGS. 2 and 3.

At this time, in a configuration in which the sealing layer 110 is provided on the entire surface of the packaging base material 10 and the non-sealing part (non-joining part) N12 includes the sealing layer 110, as shown in FIG. The thickness 10th includes the paper base material 100 and the seal layer 110. Moreover, as shown in FIG. In the configuration where N12 (non-bonded portion of 10) does not include the seal layer 110, the thickness 10th of the packaging base material 10 is a thickness that includes the paper base material 100 but does not include the seal layer 110.

Hereinafter, in this embodiment, physical properties such as thickness, bursting strength, elongation at break, air permeability, bending stiffness, smoothness, and transparency of the packaging base material 10 are determined based on the unsealed portion of the packaging body 1 (the packaging base material 10 non-junctions) measured at N12. Moreover, each physical property of the packaging base material 10 is measured by conditioning the sample according to JIS P8111 under the same humidity conditioning conditions as the sample humidity conditioning conditions.

When the thickness 10th of the packaging base material 10 is small, the basis weight of the packaging base material 10 also tends to be small. As the basis weight decreases, the packaging base material 10 becomes easier to tear.

When the thickness 10th of the packaging base material 10 is large, it is difficult to repackage the remaining sanitary paper roll 2 with the packaging base material 10 after taking out a part of the multiple sanitary paper rolls 2 included in the packaging body 1. The packaging base material 10 is difficult to bend, and the package 1 is likely to be naturally opened over time after repackaging, resulting in poor repackaging properties.

When the thickness of the packaging base material 10 is 35 μm or more and 80 μm or less, the packaging base material 10 is hard to tear and easy to bend, and after repackaging, the package 1 is hard to be opened naturally over time, and repackaging properties are good. Become.

[Density of packaging base material]
In the embodiment of the present invention, the density of the packaging base material 10 is preferably 0.850 g/cm ³ or more and 1.200 g/cm ³ or less, more preferably 0.900 g/cm ³ or more and 1.150 g/cm ³ It is as follows.

The density of the packaging base material is a calculated value obtained from the basis weight of the packaging base material obtained by the above measurement method and the thickness (paper thickness) of the packaging base material, and is calculated using the formula "(Basic weight of packaging base material)" It can be determined by ÷(packaging base material thickness (paper thickness)) (unit: g/cm ³ ).

In the range of basis weight of the packaging base material specified in the embodiment of the present invention described above, if the density of the packaging base material 10 is less than 0.850 g/cm ³ , the amount of fibers contained is small, and therefore the bond between fibers is low. , the packaging base material 10 is easily torn. Furthermore, in the range of basis weight of the packaging base material specified in the embodiment of the present invention described above, if the density of the packaging base material 10 is larger than 1.200 g/cm ³ , the packaging base material 10 will be difficult to bend, and the packaging body Processing suitability during production of No. 1 and repackaging properties after opening are poor.

[Bursting strength of packaging base material]
In the embodiment of the present invention, the bursting strength of the packaging base material 10 is 105 kPa or more and 190 kPa or less, preferably 105 kPa or more and 175 kPa or less, and more preferably 110 kPa or more and 170 kPa or less. As described above, the bursting strength of the packaging base material 10 is measured at the unsealed portion N12 of the packaging body 1 (unbonded portion of the packaging base material 10).

The bursting strength of the packaging base material 10 can be measured in accordance with JIS P8112:2008.

If the bursting strength of the packaging base material 10 is low, the packaging base material 10 is likely to be torn by the pressure applied by the fingertips when the package 1 is pinched. When the bursting strength of the packaging base material 10 is high, the packaging base material 10 is difficult to bend, and the package 1 is likely to be naturally opened over time after repackaging, resulting in poor repackaging properties.

When the bursting strength of the packaging base material 10 is 105 kPa or more and 190 kPa or less, the packaging base material 10 is difficult to tear when the package 1 is pinched, and is easy to bend, so that the package 1 will naturally change over time after repackaging. It is difficult to open and has good repackaging properties.

The bursting strength of the packaging base material is determined by (1) adjusting the blend of softwood pulp and hardwood pulp, (2) adjusting the freeness, (3) adjusting the J/W ratio, (4) when making the paper base material 100. Any one of (5) the type of sealant used in the sealing layer, and (6) the basis weight of the sealing layer during the selection and change of the type and amount added of the dry paper strength improver, and when manufacturing the packaging base material 10. Adjustment is possible by changing one condition or a combination of two or more conditions. Here, the J/W ratio is the ratio between the jet speed (J), which is the ejection speed of the pulp dispersion liquid in the paper machine when making paper base materials, and the wire speed (W), and the jet wire Also called ratio.

[Geometric mean elongation at break of packaging base material]
In the embodiment of the present invention, the geometric mean elongation at break GE of the packaging base material 10 is 2.9% or more and 6.0% or less, more preferably 3.0% or more and 5.5% or less, and Preferably, it is 3.0% or more and 5.0% or less.

If the geometric mean elongation at break of the packaging base material 10 is small, the packaging base material 10 is likely to be torn from the area where finger pressure is applied when the packaging body 1 is pinched and the vicinity thereof. If the geometric mean elongation at break of the packaging base material 10 is large, play will occur due to elongation when opening the package 1, making it difficult to tear the packaging base material 10 and open the package. When the geometric mean elongation at break of the packaging base material 10 is 2.9% or more and 6.0% or less, the packaging base material 10 is difficult to tear when the packaging body 1 is pinched, and the packaging body 10 is not easily torn when the packaging body 1 is opened. Easy to open.

The geometric mean breaking elongation GE of the packaging base material 10 is defined as the geometric mean elongation at break of the packaging base material 10 parallel to the axial direction of the sanitary paper roll 2 included in the packaging body 1 (direction A indicated by arrow A in FIGS. 1 and 2). Elongation at break in the height direction ET and elongation at break in the width direction of the packaging base material 10 perpendicular to the axial direction of the sanitary paper roll 2 included in the package 1 (direction B shown by arrow B in FIG. 2). It is the geometric mean of EH and can be calculated by the following formula (I).

GE=(ET×EH) ^1/2 ...(I)

The elongation at break ET in the height direction of the packaging base material 10 and the elongation at break in the width direction EH of the packaging base material 10 are measured at the unsealed part (joint part of the packaging base material 10) N12 of the package 1.

The elongation at break ET in the height direction (direction A) of the packaging base material 10 and the elongation at break EH in the width direction (direction B) of the packaging base material 10 are determined based on the height of the packaging base material 10 in accordance with JIS P8113:2006. When measuring the tensile strength in the direction (direction A) and the tensile strength in the width direction (direction B) of the packaging base material 10, they can be measured at the same time.

Here, in one aspect of the embodiment of the present invention, the packaging base material 10 is such that the MD direction (paper making direction, longitudinal direction, T direction) of the paper base material 100 included in the packaging base material 10 is The CD direction (direction perpendicular to the paper making direction, lateral direction, Y direction) of the paper base material 100 included in the packaging base material 10 coincides with the height direction (A direction) of the base material 10 and is the packaging base in the package 1. Although it is used so as to coincide with the width direction (direction B) of the material 10, the orientation of the packaging base material 10 in the package 1 is not limited to this in the present invention. In another aspect of the embodiment of the present invention, the packaging base material 10 is such that the MD direction (paper making direction, longitudinal direction, T direction) of the paper base material 100 included in the packaging base material 10 is the packaging base material 10 in the packaging body 1. The CD direction (direction perpendicular to the paper making direction, lateral direction, Y direction) of the paper base material 100 included in the packaging base material 10 corresponds to the width direction (B direction) of the packaging base material 10, and the height of the packaging base material 10 in the package body 1 It is used so that it coincides with the horizontal direction (A direction).

The geometric mean elongation at break of the packaging base material 10 can be controlled by adjusting the elongation at break in the height direction and the elongation at break in the width direction of the packaging base material 10. The height direction corresponds to the MD direction or CD direction of the packaging base material 10, and the width direction of the packaging base material 10 corresponds to the CD direction or MD direction of the packaging base material 10. Therefore, the geometric mean elongation at break of the packaging base material 10 is determined by the elongation at break in the MD direction (paper-making direction, machine direction, T direction) of the packaging base material 10 and the CD direction (direction orthogonal to the paper-making direction, transverse direction) of the packaging base material 10. It can be read as the geometric mean elongation at break with the elongation at break in the MD direction of the packaging base material 10 and the elongation at break in the CD direction of the packaging base material 10. be.

The elongation at break in the MD direction of the packaging base material 10 and the elongation at break in the CD direction of the packaging base material 10 are determined by (1) adjusting the blend of softwood pulp and hardwood pulp, and (2) adjusting the freeness during paper making of the paper base material 100. Changing any one condition or a combination of two or more conditions among (3) the type of sealant used in the sealing layer, and (4) the basis weight of the sealing layer during adjustment and manufacturing of the packaging base material 10. It can be adjusted by

[Operations and effects of the first embodiment]
A first embodiment of the present invention is a sanitary paper roll package in which a plurality of sanitary paper rolls are wrapped in a packaging base material, and the packaging base material includes a paper base material and a seal layer for sealing the package. The thickness of the packaging base material is 35 μm or more and 80 μm or less, the bursting strength of the packaging base material is 105 kPa or more and 190 kPa or less, and the axis of the sanitary paper roll included in the packaging body is The geometric mean elongation at break of the elongation at break in the height direction of the packaging base parallel to the direction and the elongation at break in the width direction of the packaging base perpendicular to the axial direction of the sanitary paper roll included in the package is: It is characterized by being 2.9% or more and 6.0% or less.

In the sanitary paper roll package 1 of the first embodiment, the thickness, bursting strength, and geometric mean breaking elongation of the packaging base material 10 are within the above-mentioned prescribed ranges, so that the packaging base material 10 is easy to bend and can be wrapped easily. The packaging body 1 has excellent processing suitability during manufacturing, is resistant to tearing due to finger pressure when the packaging body 1 is pinched, is easy to open the packaging body 1, and after opening the packaging body 1 contains a plurality of sanitary papers. When repackaging the remaining sanitary paper roll 2 after taking out a part of the roll 2 with the packaging base material 10, the packaging base material 10 is easy to bend, making it easy to repackage the object 2, and repackaging. A special effect can be obtained in that the package 1 is difficult to be opened naturally over time and has good repackaging properties.

<Second embodiment>
Next, a second embodiment of the present invention will be described. Unless otherwise specified, configurations applicable to the first embodiment are applicable to this aspect.

The second embodiment of the present invention is a preferred aspect of the first embodiment, and the sanitary paper roll package 1 is characterized in that the packaging base material 10 has an air permeability of 1,000 seconds or more. The air permeability of the packaging base material 10 is preferably 10,000 seconds or more, more preferably 20,000 seconds or more.

The air permeability of the packaging base material 10 is measured at the unsealed portion N12 of the packaging body 1 (joint portion of the packaging base material 10).

The air permeability (Oken style) of the packaging base material 10 is measured by the Oken style air permeability tester in accordance with JIS P8117:2009. The air permeability (surface air permeability) placed on the pressure measurement chamber side with the measurement surface (the surface that becomes It can be determined as the average value of the air permeability (the air permeability of the back surface) arranged on the pressure measurement chamber side with the surface in contact with the sanitary paper roll 2 that is the package as the measurement surface.

[Effect]
The higher the air permeability (the larger the number of seconds), the more difficult it is for air to pass through, indicating that the air permeability is inferior. If the air permeability of the packaging base material 10 is 1000 seconds or more, the packaged object may absorb external odors within the packaging object 1 during the storage period when the packaging object 1 is stored in a warehouse or during the display period when it is displayed at a store. (Sanitary paper roll) 2 can be prevented from transferring odor.

[Achievement means]
In order to make the air permeability of the packaging base material 10 1000 seconds or more, a paper base material with high air permeability can be employed as the paper base material 100 included in the packaging base material 10. Examples of such paper substrates include glassine paper. Moreover, as another means for making the air permeability of the packaging base material 10 1000 seconds or more, one side of the paper base material 100 may be entirely covered with a sealing layer 110. The sealing layer 110 may be a sealing layer formed by extruding a thermoplastic resin or a composition containing a thermoplastic resin, a film made of a thermoplastic resin, or a film containing a thermoplastic resin using a lamination processing device. The air permeability of the packaging base material 10 can be further increased by using the seal layer attached using the above-mentioned sealing layer.

<Third embodiment>
Next, a third embodiment of the present invention will be described. Unless otherwise specified, configurations applicable to the embodiments described above are applicable to this aspect.

The third embodiment of the present invention is a preferred aspect of the above-described embodiment, and the sanitary paper roll package 1 is characterized in that the packaging base material 10 has a bending stiffness in the width direction of 8 μNm or more and 35 μNm or less. The bending stiffness of the packaging base material 10 in the width direction is preferably 10 μNm or more and 30 μNm or less, more preferably 15 μNm or more and 25 μNm or less.

The bending stiffness of the packaging base material 10 is measured at the unsealed part (joint part of the packaging base material 10) N12 of the packaging body 1

The bending stiffness of the packaging base material 10 can be measured using a bending tester such as L&W bending tester (manufactured by Lorentzen & Wettre) in accordance with the method described in JIS P8125-1:2017. In detail, the bending stiffness (μN・m) is defined as the bending stiffness (μN・m) for a test piece of packaging base material 10 with a width of 38 mm and a length of 100 mm, when the bending angle is 15 degrees and the bending length (span of the sample stage) is 10 mm. The measured value is taken as the bending resistance (load), and is determined by the following calculation formula (II).

Bending stiffness (μN・m) = 60 x bending resistance (mN) x bending length 10 (mm) ² ÷ (π x bending angle 15 (°) x sample width 38 (mm)) ... (II)

The width direction of the packaging base material 10 is a direction perpendicular to the axial direction of the sanitary paper roll 2 included in the packaging body 1 (direction A shown by arrow A in FIGS. 1 to 3), and In the plan view of FIG. 3, this is the B direction indicated by arrow B. The bending stiffness in the width direction of the packaging base material 10 is the bending stiffness when the width direction of the packaging base material 10 (direction B indicated by arrow B in the figure) is the length direction of the test piece. If a test piece with a length of 100 mm cannot be taken, the length of the test piece can be shortened.

[Effect]
If the bending stiffness of the packaging base material 10 in the width direction is too small, the rigidity will be low and it will be easily torn, resulting in poor processing suitability during manufacturing. When the bending stiffness of the packaging base material 10 in the width direction increases, the packaging base material 10 becomes difficult to bend, resulting in poor repackaging properties. When the bending stiffness in the width direction of the packaging base material 10 is 8 μNm or more and 35 μNm or less, a package 1 with good processing suitability during manufacturing and good repackaging properties can be obtained.

[Achievement means]
The bending stiffness of the packaging base material 10 is largely influenced by the thickness (paper thickness). Reducing the thickness makes it easier to bend, but it also becomes easier to tear. One way to reduce the thickness (paper thickness) is to adjust the basis weight during papermaking of the paper base material 100. In general, when the basis weight of the paper base material 100 is large, the thickness (paper thickness) tends to be thick, and when the basis weight of the paper base material 100 is small, the thickness tends to be thin.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. Unless otherwise specified, configurations applicable to the embodiments described above are applicable to this aspect.

The fourth embodiment of the present invention is a preferable aspect of the above-described embodiment, in which the sanitary paper roll package 1 has a packaging base material 10 on the side that is in contact with the packaged object (sanitary paper roll) 2 contained in the package 1. The smoothness of the surface (the back surface of the packaging base material 10) is 100 seconds or more. The smoothness of the back surface of the packaging base material 10 is more preferably 300 seconds or more, and even more preferably 500 seconds or more.

The smoothness of the back surface of the packaging base material 10 is measured at the unsealed part (joint part of the packaging base material 10) N12 of the packaging body 1

The smoothness (Oken method) of the packaging base material 10 can be measured according to JIS P 8155:2010.

[Effect]
If the smoothness of the surface of the packaging base material 10 (the back surface of the packaging base material 10) on the side that contacts the packaged object (sanitary paper roll) 2 contained in the package body 1 is less than 100 seconds, it is due to the surface roughness. Therefore, when the packaging body 1 is manufactured or when vibration or the like occurs in the manufactured packaging body 1, friction occurs between the packaged body 2 and the packaging base material 10, and the surface properties of the packaged body deteriorate. tends to decline. When the smoothness of the back surface of the packaging base material 10 is 100 seconds or more, a phenomenon in which the surface properties of the packaged object are less likely to occur.

[Achievement means]
As a means for making the smoothness of the packaging base material 10 100 seconds or more, it is possible to use paper with originally high smoothness as the paper base material 100 of the packaging base material 10, and to adjust the calendering conditions for paper with low smoothness. The paper base material 100 of the packaging base material 10 is made by adjusting the smoothness by increasing the Examples include using the surface) as the back surface of the packaging base material 10.

<Others>
(1) Packaging format of the package 1 In the above-described embodiment, the caramel packaging format was cited as an example of the packaging format of the package 1, but the packaging format applicable to the present invention is not limited to this. Any known packaging format, such as a gusset packaging format, can be adopted as the packaging format for the package 1 according to the embodiment of the present invention. In detail, as long as it is practicable and there is no contradiction, the joining of the packaging base materials 10 for sealing the packaging body 1 includes stacking and pasting of different sides of the packaging base materials 10 and bonding of the packaging base materials 10. Any combination of bonding methods, such as gassho bonding in which the same surfaces are bonded together facing each other, can be employed.

In the above-described embodiment, a caramel packaging format was adopted, and the packaging was carried out so that the seal layer 110 of the packaging base material 10 was on the outer surface side of the package 1, but the embodiment of the present invention is not limited to this. . For example, in the case of adopting a packaging format using gashatsu pasting, such as a gusset packaging format, packaging may be performed such that the seal layer 110 of the packaging base material 10 is on the inner surface side of the package 1.

According to the packaging format in which the sealing layer 110 of the packaging base material 10 is placed on the outer side of the package 1, if the sealing layer 110 is a heat seal layer, the package 1 is provided with a band-shaped sheet made of paper base material. If a handle is desired to be attached, the seal layer 110 of the packaging base material 10 of the package 1 can be used to join the handle to the package body.

(2) Layer configuration of the packaging base material 10 In one embodiment of the present invention, the packaging base material 10 may be provided with other layers in addition to the sealing layer 110. Examples of other layers include functional layers such as a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printability improving layer, an overprint layer, and a light shielding layer. These other layers may be formed as necessary, for example, the surface (front surface) of the packaging base material 10 that is the outer surface side of the package 1, the surface (back surface) of the packaging base material 10 that is the inner surface side of the package 1, the paper It may be provided between the base material 100 and the seal layer 110, on the upper surface of the seal layer 110, etc. so as not to impair the adhesiveness or heat sealability of the seal layer. The other layers may be one layer or two or more layers.

Even when the packaging base material 10 includes other layers, the physical properties of the packaging base material 10 according to the embodiment of the present invention are measured at the unsealed part N12 of the packaging body 1 (joint part of the packaging base material 10). Ru. Therefore, for example, when the unsealed portion N12 of the package 1 includes a layer having some kind of functionality as described above (hereinafter also referred to as a functional layer), the thickness of the packaging base material 10 ( The paper thickness includes the thickness of the paper base material and the thickness of the functional layer. Further, when the unsealed portion N12 of the package 1 does not include the seal layer 110 and the functional layer as described above, the thickness (paper thickness) of the packaging base material 10 is substantially equal to that of paper. This is the thickness of the base material.

(3) Proportion of paper base material in packaging base material 10 (mass ratio)
In one embodiment of the present invention, the proportion (mass ratio) of the paper base material 100 in the packaging base material 10 is preferably 51 mass% or more.

The ratio of the paper base material is calculated as the ratio (percentage) of the basis weight of the paper base material to the basis weight of the packaging base material, using the formula "(Basic weight of the paper base material) ÷ (Basic weight of the packaging base material) x 100" (Unit: %)

In addition, the basis weight of the packaging base material used when determining the proportion of the paper base material is the basis weight including the non-joint part N12 and the joint parts (12S, 12T, 12B) of the packaging base material 10. Components other than the paper base material 100 constituting the packaging base material 10 include a sealant contained in the seal layer 110 and a functional material contained in the above-mentioned functional layer, such as a resin component. Components other than the paper base material 100 are preferably biodegradable.

According to the Law for Promotion of Effective Utilization of Resources in Japan, in the case of composite materials of plastic and paper, an identification mark is required to identify the main material in terms of mass. That is, if the proportion of plastic contained in the packaging base material 10 exceeds 50% by mass, a plastic mark must be displayed, and if the proportion of paper exceeds 50% by mass, a paper mark must be displayed.

When the proportion (mass ratio) of the paper base material 100 in the packaging base material 10 is 51% by mass or more, a paper mark can be displayed on the packaging base material 10. By displaying the paper mark, the packaging base material 10 of the package 1 can be discarded in the same way as paper.

In addition, if the proportion (mass ratio) of the paper base material 100 in the packaging base material 10 is 51% by mass or more, it is possible to use a common non-biodegradable polyethylene film, polypropylene film, etc. in the packaging of sanitary paper rolls. Compared to a packaging film made of 100% resin film, at least the amount of resin used is greatly reduced, making it possible to eliminate plastics and reduce plastics.

(3) Handle of package The package 1 according to the embodiment of the present invention may further include a handle (not shown) for carrying the package 1. Note that the handle is not an essential component of the present invention. The handle may be, for example, a belt-shaped handle whose both ends are joined to the outer surface of the package body. The material of the handle may be a film or a base material mainly made of paper (paper base material).

When the sealing agent contained in the sealing layer 110 of the packaging base material 10 of the package 1 is a heat sealant, if the material of the handle is a paper base material, the package 1 is used to join the handle and the package body. It is possible to use the sealing layer 110 of the packaging base material 10 of 1, which is preferable.

Hereinafter, the present invention will be explained by giving Examples and Comparative Examples. Note that the present invention is not limited to the examples shown below.

(Example 1)
Glassine paper was used as the paper base material, and a polyethylene layer having a thickness of 15 μm was formed on the entire one side of the paper base material by an extrusion method to form a sealing layer to obtain a packaging base material.

Using the obtained packaging base material, two kitchen paper rolls (roll width 230 mm, roll diameter 115 mm, winding length 22.7 m) arranged in two rows horizontally and one row vertically were used as the packaging base material. The package of Example 1 as shown in FIG. 1 was obtained by packaging in a caramel packaging format so that the seal layer was on the outer surface of the package. At this time, the object to be packaged was wrapped using the packaging base material so that the axial direction of the kitchen paper roll (A direction indicated by arrow A in FIG. 1) and the MD direction of the paper base material were parallel to each other.

(Examples 2 to 4, Comparative Examples 1 and 2)
Using a paper base material (glassine paper) having a different basis weight from the paper base material (glassine paper) of Example 1, packages of Examples 2 to 4 and Comparative Examples 1 and 2 were prepared in the same manner as in Example 1. Obtained. The examples are Comparative Example 1, Example 3, Example 2, Example 1, Example 4, and Comparative Example 2 in descending order of paper base weight.

(Examples 5 and 6, Comparative Examples 3 and 4)
Examples 5 and 6 and Comparative Example 3 were prepared in the same manner as in Example 1 using a paper base material (glassine paper) having a different amount of paper strength agent added from the paper base material (glassine paper) of Example 1. and 4 packages were obtained. The paper base materials of Example 5 and Comparative Example 3 have a smaller amount of paper strength agent added than the paper base material of Example 1. The paper base materials of Example 6 and Comparative Example 4 have a larger amount of paper strength agent added than the paper base material of Example 1.

(Example 7, Example 8)
Packaging bodies of Examples 7 and 8 were obtained in the same manner as in Example 1 using a paper base material (glassine paper) having a different T/Y ratio from the paper base material (glassine paper) of Example 1.

Here, the "T/Y ratio" is an index of the directionality of tensile strength based on the orientation of pulp fibers constituting the paper base material. (T), and the direction perpendicular thereto (CD direction) is the horizontal direction (Y), and the intensity ratio in both directions is taken, and is also called the "aspect ratio."

The paper base material of Example 7 has a smaller T/Y ratio than the paper base material of Example 1. The paper base material of Example 8 has a larger T/Y ratio than the paper base material of Example 1. The T/Y ratio is, for example, the jet wire ratio (J/W), which is the ratio between the jet speed (J), which is the ejection speed of the pulp dispersion liquid, and the wire speed (W), in the paper machine when making paper base materials. ) can be controlled by adjusting.

(Example 9)
A package of Example 9 was obtained in the same manner as in Example 1 except that glossy paper was used instead of glassine paper as the paper base material. At this time, the sealing layer was applied to the entire non-glossy surface, which is a surface with relatively low smoothness among both surfaces of the single-gloss paper. In addition, the glossy surface, which is a relatively smooth surface of both surfaces of the glossy paper, was used as the surface that would be in contact with the kitchen paper roll included in the package. In addition, the basis weight (30.0 g/m ² ) of the paper base material (single gloss paper) of Example 9 is from the basis weight (40.0/m ² ) of the paper base material (glassine paper) of Example 1. It was also low and comparable to the basis weight of the paper base material (glassine paper) of Example 2 (basis weight 30.5 g/m ² ).

(Example 10)
Instead of forming a polyethylene layer on the entire one side of the paper base material using an extrusion method to form a sealing layer, a part of one side of the paper base material (indicated by hatching in FIG. 3(a)) is used to bond the packaging base material. A heat-sealing agent was applied to a predetermined area (predetermined area) to form a heat-sealing layer, and the package of Example 10 was obtained in the same manner as in Example 1. A polyolefin water-based heat sealant was used as the heat sealant, and a roll coater was used for coating.

(Comparative Examples 5 and 6)
Packaging bodies of Comparative Examples 5 and 6 were obtained in the same manner as in Example 10 using a paper base material (glassine paper) having a different basis weight from the paper base material (glassine paper) of Example 10. The examples are Comparative Example 6, Comparative Example 5, and Example 10 in descending order of paper base weight.

(Comparative example 7)
Instead of glassine paper being used as a paper base material, single-gloss paper was used, and instead of forming a polyethylene layer on the entire one side of the paper base material by extrusion method to form a sealing layer, a polyethylene layer was formed on a part of one side of the paper base material (Figure 3). A heat-sealing agent was applied to the predetermined region (indicated by hatching in (a) of FIG. Obtained. At this time, the heat-sealing layer was applied to the entire non-glossy surface, which is the surface with relatively low smoothness among both surfaces of the glossy paper. In addition, the glossy surface, which is a relatively smooth surface of both surfaces of the glossy paper, was used as the surface that would be in contact with the kitchen paper roll included in the package. As in Example 10, a polyolefin water-based heat sealant was used as the heat sealant, and a roll coater was used for coating.

In addition, the basis weight (50.5 g/m ² ) of the paper base material (single gloss paper) of Comparative Example 7 is greater than the basis weight (40.0/m ² ) of the paper base material (glassine paper) of Example 1. It was also expensive.

[Physical properties of packaging base material]
Tables 1 to 4 show the physical properties of the paper base material and packaging base material used in each example. The physical properties were measured under an environment according to Japanese Industrial Standards JIS P8111 (temperature 23±1° C., humidity 50±2% RH) by conditioning the sample for 48 hours.

(Basic weight of paper base material)
The basis weight (unit: g/m ² ) per sheet of paper base material was measured in accordance with JIS P8124.

(Basic weight of packaging base material)
The basis weight (unit: g/m ² ) per packaging base material was measured in accordance with JIS P8124. The measurement was performed on the unsealed area of the package (unbonded area of the packaging base material), avoiding the sealed area of the package (the joint area of the packaging base material).

(Basic weight of seal layer)
For each example (Examples 1 to 9 and Comparative Examples 1 to 4) in which the seal layer was formed by an extrusion method, the basis weight of the seal layer was determined from the basis weight of the packaging base material obtained by the above measurement method. It is a calculated value by subtracting the basis weight of , and was determined by the formula "(Basic weight of packaging base material) - (Basic weight of paper base material)" (unit: g/m ² ).

(Coating amount of seal layer)
For each example (Example 10 and Comparative Examples 5 to 7) in which the seal layer was formed by coating with a roll coater, the basis weight of the seal layer was determined by the amount of sealant per unit area in the sealant-coated area of the packaging base material. It was determined as a coating amount.

(Thickness of packaging base material (paper thickness))
The thickness (paper thickness) of the packaging base material was measured in accordance with ISO534:2011 (unit: μm). The pressure on the pressure surface in the measurement was 100 kPa±10 kPa. The measurement was performed on the unsealed area of the package, avoiding the sealed area.

(Packaging base material density)
The density of the packaging base material is a calculated value obtained from the basis weight of the packaging base material obtained by the above measurement method and the thickness (paper thickness) of the packaging base material, and is calculated using the formula "(Basic weight of packaging base material)" It was determined by ÷(packaging base material thickness (paper thickness)) (unit: g/cm ³ ).

(Smoothness of packaging base material)
The smoothness (Ouken method) of the back surface of the packaging base material was measured in accordance with JIS P8155:2011 (unit: seconds). The measurement was performed on the unsealed area of the package, avoiding the sealed area. The surface of the packaging base material that comes into contact with the kitchen paper roll included in the package was defined as the "back side of the packaging base material."

(Air permeability of packaging base material)
In accordance with JIS P8117:2009, measure the air permeability (Ouken method) on both the front and back sides of the packaging base material, calculate the average value of the air permeability on both sides, and calculate the air permeability of the packaging base material. (unit: seconds). The measurement was performed on the unsealed area of the package, avoiding the sealed area. The surface of the packaging base material in contact with the kitchen paper roll contained in the package was defined as the "back side of the packaging base material", and the surface of the packaging base material that was on the outside side of the package was defined as the "front surface of the packaging base material".

(Transparency of packaging base material)
The transparency of the packaging base material was measured in accordance with ISO5-2 using a diffused light transmittance meter DOT-5 (manufactured by Murakami Color Research Institute) (unit: %). The measurement was performed on the unsealed area of the package (unbonded area of the packaging base material), avoiding the sealed area of the package (the joint area of the packaging base material).

(Bursting strength of packaging base material)
The bursting strength of the packaging base material was measured in accordance with JIS P8112:2008 (unit: kPa). The measurement was performed on the unsealed area of the package (unbonded area of the packaging base material), avoiding the sealed area of the package (the joint area of the packaging base material).

(Tensile strength of packaging base material)
The tensile strength of the packaging base material in the longitudinal and transverse directions was measured in accordance with JIS P8113:2006 (unit: kN/m). The measurement was performed on the unsealed area of the package (unbonded area of the packaging base material), avoiding the sealed area of the package (the joint area of the packaging base material).

(Elongation at break of packaging base material)
The elongation at break of the packaging substrate can be measured at the same time as the tensile strength of the packaging substrate is measured. When measuring the tensile strength in the longitudinal and transverse directions of the packaging substrate mentioned above, the elongation at break in the longitudinal and transverse directions of the packaging substrate is also measured, and this is calculated based on the elongation at break in the height and transverse directions of the packaging substrate. (Unit: %)

(Geometric mean elongation at break of packaging base material)
The geometric mean elongation at break (GE) of the packaging base material is the geometric mean of the elongation at break (ET) in the height direction of the packaging base material and the elongation at break (EH) in the width direction of the packaging base material obtained by the above measurement method. It was determined by the formula "{Elongation at break in the height direction of the packaging base material (ET) x Elongation at break in the width direction of the packaging base material (EH)} ^1/2 " (unit: %).

(Bending stiffness of packaging base material)
In accordance with JIS P8125-1:2017, the bending stiffness of the packaging base material in the height direction and width direction was measured using an L&W bending tester (manufactured by Lorentzen & Wettre) (unit: μN·m). In detail, the bending stiffness is the bending resistance of a test piece of packaging base material 10 with a width of 38 mm and a length of 100 mm, when the bending angle is 15 degrees and the bending length (span of the sample stage) is 10 mm. (load), and the bending stiffness was determined using the following formula.

Bending stiffness (μN・m) = 60 x bending resistance (mN) x bending length 10 (mm) ² ÷ (π x bending angle 15 (°) x sample width 38 (mm))

The measurement was performed on the unsealed area of the package (unbonded area of the packaging base material), avoiding the sealed area of the package (the joint area of the packaging base material). The direction of the packaging base material parallel to the axial direction of the sanitary roll contained in the packaging body is defined as the "height direction of the packaging base material", and the direction of the packaging base material perpendicular to the axial direction of the sanitary roll contained in the packaging body The direction of the base material was defined as the "width direction of the packaging base material." The bending stiffness when the longitudinal direction of the packaging base material is taken as the length direction of the test piece is defined as the "vertical bending stiffness of the packaging base material", and the width direction of the packaging base material is taken as the length direction of the test piece. The bending stiffness at that time was defined as the "bending stiffness in the width direction of the packaging base material."

[Sensory test]
The following sensory tests were conducted on the packages obtained in each example.

(Difficulty in tearing packaging base material)
The presence or absence of tearing of the packaging base material was observed at locations where finger pressure was applied when the packaging was picked up and carried with one hand. For each example, 20 packages were tested by one tester, and the results of the ratio of the number of packages that were not torn were evaluated on a four-level scale. The larger the evaluation value, the better the evaluation (4 (excellent) → 1 (poor)).

(Ease of repackaging the packaged object)
After manually opening the package obtained in each case and taking out one of the two kitchen paper rolls contained inside, the remaining packaging material was used to remove the paper that remained inside the package. Thirty testers examined the ease of repackaging one kitchen paper roll as an object to be wrapped so that the outer surface of the kitchen paper roll would not be exposed, and whether the package would not be opened over time after repackaging. It was evaluated by The method of opening and repackaging in the test is illustrated in FIGS. 4 and 5, but is not limited to these, and was left to each tester. The larger the evaluation value, the better the evaluation (4 (excellent) → 1 (poor)).

(Odor transfer to the packaged object)
A non-woven soup stock bag containing the packaging obtained in each example and 30 g of coffee powder in a plastic bag with a zipper (Unipack (registered trademark)) thick-mouthed L-8 (dimensions 340 mm x 480 mm, thickness 0.08 mm). After putting in the plastic bag and sealing it, it was stored for one week in an environment with a temperature of 23°C and a humidity of 50% RH.After storage, the package was removed from the plastic bag and opened, and the smell of coffee from the kitchen paper roll was detected. were scored by five testers using the following criteria.The evaluation values shown in the table are the average values of the five testers' scores, rounded to the nearest whole number.The higher the evaluation value, the less perceptible the odor; Indicates excellence (3 (excellent) → 1 (poor)).

3: I hardly feel the odor of coffee 2: I feel the odor of coffee slightly 1: I feel the odor of coffee strongly

(Visibility of packaged object)
For the packages obtained in each example, 30 testers evaluated the ease of checking the condition (embossment, perforation, color) of the packaged article (kitchen paper roll) from the outside of the package. The larger the evaluation value, the better the visibility. (4 (excellent) → 1 (poor))

[Test results]
Test results are shown in Tables 1 to 4. In addition, since Example 10 and Comparative Examples 5 to 7 do not have a sealing layer in the non-bonded part of the packaging base material corresponding to the non-sealed part of the package, the packaging of Example 10 and Comparative Examples 5 to 7 The physical properties of the base material are substantially those of the paper base material.

All samples from Example 1 to Comparative Example 7 (all samples) are kitchen paper roll packages in which two sanitary paper rolls are wrapped in a packaging base material, and the packaging base material is a paper base material and a packaging body. This was a kitchen paper roll package having a layered structure including a sealing layer for securing the product.

As shown in Tables 1 to 2, in the kitchen paper roll packages of Examples 1 to 10, the thickness of the packaging base material is 35 μm or more and 80 μm or less, and the packaging base material ruptures. The strength is 105 kPa or more and 190 kPa or less, and the elongation at break in the height direction of the packaging base material parallel to the axial direction of the kitchen paper roll contained in the packaging body and the axial direction of the kitchen paper roll contained in the packaging body. The geometric mean elongation at break compared with the elongation at break in the width direction of the packaging substrate perpendicular to the packaging substrate was 2.9% or more and 6.0% or less.

The kitchen paper roll packages of Examples 1 to 10 were all rated 3 (good) or 4 (excellent) in the "tear resistance of the packaging base material" (4-level evaluation), and were easy to pick up with fingers. It was hard to tear when I carried it around.

In addition, the "ease of repackaging the packaged object" (4-level evaluation) is determined by the fact that the basis weight of the paper base material and the packaging base material is relatively high, and the thickness of the packaging base material (paper thickness) is relatively high. Example 4, Example 6 where the amount of paper strength agent added to the paper base material during paper making is relatively large, and Example 7 where the T/Y ratio of the paper base material is relatively low and the anisotropy is small. In other examples, the evaluation was 2 (fair), and in other examples, the evaluation was 3 (good) or 4 (excellent), and it was easy to repackage.

In addition, regarding "odor transfer to the packaged object" (3-level evaluation), Example 10, in which the seal layer was provided by coating an aqueous sealant, received a rating of 2, indicating that odor transfer was slightly felt, but the seal layer Examples 1 to 9, which were prepared by forming films using an extrusion method, were evaluated as 3, and were good with almost no odor transfer.

In addition, regarding the "visibility of the packaged object" (4-level evaluation), Example 9, in which the paper base material was single-gloss paper, was rated 2, which was slightly low in visibility, but the paper base material was glassine paper. Examples 1 to 3, Examples 5 to 8, and Example 10 were evaluated as 4, and the visibility was excellent.

In Comparative Example 1, the basis weight of the paper base material and, in turn, the packaging base material was lower than that of Examples 1 to 3. The thickness of the packaging base material of Comparative Example 1 was 37 μm, which was within the specified range of the present invention, but the bursting strength (90 kPa) and geometric mean elongation at break (2.40%) were outside the specified range of the present invention. The value was low, and the "difficulty of tearing the packaging base material" was rated 1 (poor), indicating that it was easy to tear. Further, the bending stiffness (width direction) of Comparative Example 1 was 6.5 μNm, which was lower than that of Examples, and it was easy to bend, and the "ease of repackaging of the packaged object" was evaluated as 4, which was excellent.

Comparative Example 2 had a higher basis weight of the paper base material and thus the packaging base material compared to Examples 1 and 4. The thickness of the packaging base material of Comparative Example 2 was 78 μm, which was within the specified range of the present invention, but the bursting strength (233 kPa) and geometric mean elongation at break (6.13%) were within the specified range of the present invention. It was outside and the price was high. Moreover, the bending stiffness (width direction) of Comparative Example 2 was 49.8 μNm, which was higher than that of the example. The "ease of repackaging of the packaged object" of Comparative Example 2 was evaluated as 1, which was poor. Further, the transparency of Comparative Example 2 was 57.0%, which was lower than that of Examples, and the "visibility of the packaged object" (4-level evaluation) was rated 1, which was poor.

In Comparative Example 3, compared to Example 1, the amount of paper strength agent added to the paper base material during paper making was smaller. The thickness of the packaging base material of Comparative Example 3 was 52 μm, which was within the specified range of the present invention, but the bursting strength (99 kPa) and geometric mean elongation at break (2.33%) of Comparative Example 3 were within the specified range of the present invention. The value was low and outside the specified range, and the "tear resistance of the packaging base material" was evaluated as 1, which was poor. In addition, the bending stiffness (width direction) of Comparative Example 3 was 4.1 μNm, which is lower than that of Example 1 (20.1 μNm), and the "ease of repackaging of the packaged object" was evaluated as 4, which is excellent. was.

In Comparative Example 4, compared to Example 1, the amount of paper strength agent added to the paper base material during paper making was larger. The thickness of the packaging base material of Comparative Example 4 was 52 μm, which was within the specified range of the present invention, but the bursting strength (202 kPa) of Comparative Example 4 was outside the specified range of the present invention, and was high. . Further, the geometric mean elongation at break (5.59%) was within the specified range of the present invention, but the value was high. Moreover, the bending stiffness (width direction) of Comparative Example 4 was 33.5 μNm, which was higher than that of Example 1 (20.1 μNm). Comparative Example 4 had a rating of 1 for "ease of repackaging of the packaged object", which was poor.

In Comparative Example 5, the basis weight of the paper base material was the same as in Example 2, but the coating method of the sealant was different from Example 2, and the coating weight of the sealing layer ( quantity) was low. The thickness of the packaging base material of Comparative Example 5 was 29 μm, which was outside the specified range of the present invention and was thin, and the "odor transfer to the packaged object" was evaluated as 2, which was inferior compared to Example 2. . The bursting strength (96 kPa) and geometric mean breaking elongation (2.63%) of Comparative Example 5 are outside the specified range of the present invention and have low values, and the "tear resistance of the packaging base material" is rated 1, It was inferior. In addition, the bending stiffness (width direction) of Comparative Example 5 was 8.7 μNm, which is lower than that of Example 2 (12.1 μNm), and the "ease of repackaging of the packaged object" was evaluated as 4, which is excellent. was.

In Comparative Example 6, the basis weight of the paper base material was the same as in Example 3, but the coating method of the sealant was different from Example 3, and the coating amount of the sealing layer ( quantity) was low. The thickness of the packaging base material of Comparative Example 6 was 25 μm, which was outside the specified range of the present invention and was thin, and the "odor transfer to the packaged object" was evaluated as 2, which was inferior to Example 3. . The bursting strength (91 kPa) and geometric mean breaking elongation (2.46%) of Comparative Example 6 are outside the specified range of the present invention and have low values, and the "tear resistance of the packaging base material" is rated 1, It was inferior. In addition, the bending stiffness (width direction) of Comparative Example 6 was 4.8 μNm, which is lower than that of Example 3 (8.1 μNm), and the "ease of repackaging of the packaged object" was evaluated as 4, which is excellent. was.

In Comparative Example 7, the type of packaging base material was the same as Example 9, which was single-glazed paper, but the method of applying the sealant was different from Example 9, and the sealing layer was The coating weight (basis weight) was low. The thickness of the packaging base material of Comparative Example 7 was 50 μm, which was within the specified range of the present invention, but was thicker than that of Example 9 (45 μm). In Comparative Example 7, the transparency of the packaging base material was 57.3%, which was lower than that in Example 9 (62.0%). Comparative Example 7 was inferior to Example 9, with evaluations of 1 for both "odor transfer to packaged objects" and "visibility of packaged objects." The bursting strength (102 kPa) and geometric mean breaking elongation (2.73%) of Comparative Example 7 are outside the specified range of the present invention and have low values, and the "tear resistance of the packaging base material" is rated 1, It was inferior.

1 Sanitary paper roll packaging (packaging)
2 Sanitary paper roll (kitchen paper roll) (packaged object)
10 Packaging base material 100 Paper base material 110 Seal layer (heat seal layer, adhesive layer)

Claims (7)

A sanitary paper roll package in which a plurality of sanitary paper rolls are wrapped with a packaging base material,
The packaging base material has a layered structure including a paper base material and a sealing layer for sealing the packaging body,
The thickness of the packaging base material is 35 μm or more and 80 μm or less,
The bursting strength of the packaging base material is 105 kPa or more and 190 kPa or less,
The elongation at break in the height direction of the packaging base material is parallel to the axial direction of the sanitary paper roll contained in the packaging body, and the packaging is perpendicular to the axial direction of the sanitary paper roll contained in the packaging body. A sanitary paper roll package characterized in that the geometric mean elongation at break in the width direction of the base material is 2.9% or more and 6.0% or less. The sanitary paper roll package according to claim 1, wherein the packaging base material has an air permeability of 1000 seconds or more. The sanitary paper roll package according to claim 1 or 2, wherein the packaging base material has a bending stiffness in the width direction of 8 μNm or more and 35 μNm or less. The sanitary paper roll according to any one of claims 1 to 3, wherein the surface smoothness of the packaging base material on the side that contacts the sanitary paper roll contained in the packaging body is 100 seconds or more. packaging. The sanitary paper roll package according to any one of claims 1 to 4, wherein the packaging base material has a transparency of 60% or more. The sanitary paper roll package according to any one of claims 1 to 5, wherein the paper base material is glassine paper. The sanitary paper roll package according to any one of claims 1 to 6, wherein the packaging format of the package is a caramel packaging format.

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