JP7793877B2 - Roll-type sanitary tissue paper packaging - Google Patents

Description

The present invention relates to a packaging material for rolled sanitary tissue paper.

Packaging bags for rolls of thin sanitary paper, such as kitchen paper, paper towels, toilet paper, and tissue paper, are distributed and used in a state where multiple rolls are housed in a packaging bag made of resin film.In recent years, from the viewpoint of reducing environmental impacts such as global warming due to _CO2 emissions and marine pollution by microplastics, there has been an active movement to change packaging bags used for rolls of thin sanitary paper from resin to paper, thereby reducing the amount of resin used in the packaging bags (for example, Patent Document 1).

Patent Document 1 describes a toilet roll packaging body that includes a heat-seal layer on a paper substrate. When including a heat-seal layer on a paper substrate, it discloses cases in which the heat-seal layer is formed on the entire surface of the paper substrate, and cases in which the heat-seal layer is formed only in areas where paper substrates are laminated and joined together.

Japanese Patent Application Laid-Open No. 2021-172415

When a heat seal layer is formed over the entire surface of a paper substrate and the product being packaged is in roll form, the corners (ridges) where the periphery and end faces of the roll intersect come into contact with the packaging bag, so the contact surface comes into contact with the heat seal layer. This creates the risk that the heat sealant will adhere to or bond to the roll product, compromising the quality and appearance of the rolled product. This problem is particularly evident when packaging caramel cans, as the corners are the areas that receive the most pressure.

On the other hand, if the heat seal layer is only formed in the areas where the paper substrates are laminated and joined together, the area where the heat seal layer is formed may end up with a complex shape, a mottled pattern, or isolated areas, particularly in the case of caramel packaging. This increases the likelihood that the application process of the heat seal agent and handling after the heat seal layer is formed will become complicated.

The objective of this embodiment is to provide a package for rolled sanitary tissue paper in which a heat seal agent is applied to a base material, so that even when rolled sanitary tissue paper is packaged using a base material containing paper, the heat seal agent (heat seal layer) does not come into contact with the corners of the roll.

The first embodiment of the disclosed invention is a package for rolled sanitary thin paper, including a paper substrate for packaging multiple rolled sanitary thin paper, in which a heat sealant is applied to the surface of the paper substrate that comes into contact with the multiple rolled sanitary thin paper, except for the areas where corners formed by the peripheral surface and the top or bottom surface of the rolled sanitary thin paper come into contact with the paper substrate.

Here, one of the two end faces spaced apart in the central axis direction of a roll of sanitary tissue paper (hereinafter sometimes referred to as a "roll") is referred to as the top face, and the other end face is referred to as the bottom face. The top and bottom faces are relative, and there is no set top or bottom, for example.

In the first embodiment, the heat sealant is applied to the corners formed by the peripheral and upper or lower surfaces of the rolled sanitary thin paper, except for the areas where they come into contact with the paper base material. Therefore, regardless of the packaging format, the corners do not come into contact with the heat sealant (hereinafter sometimes referred to as the "heat seal layer"), and the corners of the roll are not damaged by the heat sealant.

A second embodiment of the disclosed invention is a packaging body for rolled sanitary tissue paper, in which the multiple rolled sanitary tissue paper sheets are packaged using a caramel method.

When packaging multiple rolls of sanitary tissue paper using the caramel method, even if the corners of the rolls are subjected to strong pressure from the paper substrate, the corners of the rolls will not be damaged by the heat sealant because no heat sealant is applied to the surface that comes into contact with the paper substrate.

A third embodiment of the disclosed invention is a packaging body for rolled thin sanitary paper as described in claim 1 or 2, wherein, when the multiple rolls of thin sanitary paper are stacked in at least two or more layers, the areas where the corners formed by the peripheral surface and the top or bottom surface of the rolled thin sanitary paper come into contact with the paper substrate are the corners formed by the peripheral surface and the top surface of the topmost roll of thin sanitary paper and the corners formed by the peripheral surface and the bottom surface of the bottommost roll of thin sanitary paper.

Here, when multiple rolls of thin sanitary paper are stacked vertically in at least two or more layers, this refers to two or more rolls stacked along the same axis (or lined up in series). The topmost roll refers to the outermost roll on one of the stacked rolls, and the bottommost roll refers to the outermost roll on the other stack.

According to the third embodiment, when multiple rolls of sanitary tissue paper are stacked in two or more layers at least along the central axis of the rolls, the corners that receive strong pressure from the paper substrate are the corners formed by the circumferential surface and top surface of the topmost roll and the corners formed by the circumferential surface and bottom surface of the bottommost roll. Because the areas where these corners come into contact with the paper substrate are not coated with a sealant, the corners do not come into contact with the sealant, and the corners of the rolls are not damaged by the heat sealant.

A fourth embodiment of the disclosed invention is a package for rolled sanitary tissue paper, in which the plurality of rolled sanitary tissue paper rolls are either kitchen paper, paper towels, toilet paper, or tissue paper.

Multiple rolls of kitchen paper, paper towels, toilet paper, or tissue paper are packaged in a packaging substrate coated with a heat sealant, except for the areas where the corners formed by the periphery and top or bottom of the roll come into contact with the paper substrate. This prevents the corners from coming into contact with the heat sealant, and the corners of the roll are not damaged by the heat sealant.

One aspect of the disclosed invention provides a package for rolled sanitary tissue paper in which a heat sealant (heat seal layer) is coated on a paper substrate, so that even when rolled sanitary tissue paper is packaged using a substrate containing paper, the heat sealant (heat seal layer) does not come into contact with the corners of the roll.

FIG. 1 is a diagram showing a package in which a roll of sanitary tissue paper is contained in a packaging bag. FIG. 2 is a diagram showing a roll of sanitary thin paper contained in a packaging bag. FIG. 2 is a view of the package of FIG. 1 as seen from the top side. 2 is a view of the package of FIG. 1 as seen from the bottom side. FIG. FIG. 2 is a view of the package of FIG. 1 as seen from one side. 2 is a view of the packaging body of FIG. 1 as seen from the other side. FIG. FIG. 2 is a view of the packaging body of FIG. 1 as seen from one end face side. 1 as viewed from the other end face side. FIG. FIG. 2 is a development view of the packaging bag as seen from the surface that contacts the roll. 10 is a cross-sectional view taken along line AA in FIG. 9.

<Package>
An embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, common parts are given the same reference numerals and their description may be omitted. In addition, the scale of each member in each drawing may differ from the actual scale. In each drawing, a three-dimensional Cartesian coordinate system with three axial directions (X direction, Y direction, and Z direction) is used, with the width direction of the packaging bag being the X direction, the longitudinal direction being the Y direction, and the height direction (vertical direction or thickness direction) being the Z direction.

Figure 1 is a diagram showing a package in which a roll is housed in a packaging bag according to an embodiment. Figure 2 is a diagram showing a roll housed in the packaging bag. Figures 3, 4, 5, 6, 7, and 8 are views of the package in Figure 1 from the top, bottom, one side, the other side, one end, and the other end, respectively. Package 100 is an example of a package according to this embodiment, and includes a packaging bag 10 and a roll 20 of sanitary tissue paper.

The roll 20 is an example of a roll of sanitary tissue paper that is housed in the packaging bag according to this embodiment. In the example shown in Figure 1, two rolls 20 are housed in the packaging bag 10. As shown in Figure 2, the roll 20 is constructed by winding a long sheet 21 around a hollow core 22.

The form of the roll 20 is not particularly limited, and it can be applied to sanitary thin paper such as kitchen paper, toilet paper, paper towels, and tissue paper. The use of the roll 20 is also not particularly limited, and it can be used for industrial, household, or portable purposes. Of these, household kitchen paper is preferably used as the roll 20 in this embodiment.

As shown in Figure 1, the peripheral surface 21A of the roll 20 faces the top surface 11, bottom surface 12, side surface 13, and side surface 14 of the packaging bag 10, respectively, and a portion of the peripheral surface 21A contacts a portion of the peripheral surface 21A of an adjacent roll 20. Note that in Figure 1 and elsewhere, W1, L1, and H1 respectively indicate the length, width, and height of the package 100. Also, 30, 40, and 50 indicate seals.

The roll 20 has two end surfaces. One end surface is the upper surface 21B, and the other end surface is the lower surface 21C. Note that the upper and lower surfaces are in a relative relationship, and there is no fixed top or bottom.

When two or more rolls 20 are stacked (arranged in series), the roll on the upper surface 21B is the topmost roll, and the roll on the lower surface 21C is the bottommost roll.

Corner 23B is a ridge formed by peripheral surface 21A and upper surface 21B of roll 20. Corner 23C is a ridge formed by peripheral surface 21A and lower surface 21C. As shown in Figure 1, when packaging is performed in packaging bag 10, these corners 23B and 23C deform along the ridges of corners 23B and 23C, forming a tight seal. In particular, when the packaging is caramel packaging, as shown in Figure 1, corners 23B and 23C are subjected to strong pressure from the packaging bag.

The dimensions of the roll 20 are not particularly limited, but the width dimension (roll width) L2 of the long sheet 21 in the width direction (Y direction) is preferably 85 mm or more and 500 mm or less, and the diameter dimension (roll diameter) W2 of the long sheet 21 in the radial direction (X direction or Z direction) is preferably 80 mm or more and 200 mm or less (see Figure 2).

The number of plies in the long sheet 21 is not particularly limited, but can be one or more, and is preferably one or two plies (two layers stacked).

The material of the long sheet 21 is not particularly limited, but can be, for example, paper, nonwoven fabric, cloth, or other sheets, with paper (paper sheet) being preferred. When the long sheet 21 is a paper sheet, base paper made primarily of pulp is used. The pulp composition can be any known composition for paper sheets. For example, the pulp content can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

The pulp composition of the long sheet 21 (paper sheet) is not particularly limited. For example, any ratio of softwood pulp, such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp), to hardwood pulp, such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp), can be used. The ratio of hardwood pulp to softwood pulp is not limited, but is preferably 10:90 to 80:20, and more preferably, the pulp composition has a higher ratio of softwood pulp to hardwood pulp. The pulp contained in the long sheet 21 (paper sheet) may also be recycled paper pulp.

The basis weight of the long sheet 21 is not particularly limited, but in the case of paper, it is 5 g/ ^m2 to 80 g/ ^m2 , preferably 10 g/ ^m2 to 60 g/ ^m2 , and more preferably 10 g/ ^m2 to 45 g/ ^m2 , depending on the number of plies. In the case of nonwoven fabric, it is preferably 20 g/ ^m2 to 100 g/ ^m2 . The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

The thickness of the long sheet 21 (paper sheet) is not particularly limited, and the paper thickness measured under the conditions specified in JIS P 8111 (1998) can be used. For example, if the long sheet 21 is paper, the paper thickness per two plies is 50 μm or more and 600 μm or less, preferably 60 μm or more and 500 μm or less, and more preferably 130 μm or more and 400 μm or less.

The long sheet 21 (paper sheet) may also be embossed. Such embossing can be performed using a known embossing method.

The hollow core 22 is a cylindrical winding core around which the long sheet 21 is wound in the circumferential direction (R direction) (see Figure 2). The hollow core 22 may also have a structure in which there is no winding core (coreless structure). There are no particular restrictions on the material of the hollow core 22, and paper, resin, etc. may be used.

The shape of the hollow core 22 is not particularly limited. For example, if the hollow core 22 is a paper tube, it may be made of either a single layer of cardboard or multiple layers of cardboard, or it may be a coated cardboard base paper that has been printed on or coated with a deodorant in advance. Furthermore, the way the paper tube is wound is not particularly limited. For example, it may be flat-wound or spirally wound (a so-called spiral paper tube).

The dimensions of the hollow core are not particularly limited. For example, the length of the hollow core 22 in the longitudinal direction (Y direction) is approximately the same as the roll width of the roll 20 in the width direction (Y direction) (85 mm to 500 mm). Furthermore, the diameter dimension of the hollow core 22 in the radial direction (X direction or Z direction) is 33 mm to 50 mm, preferably 35 mm to 45 mm (see Figure 2).

<Packaging bag>
The packaging bag 10 is an example of a packaging bag according to the present embodiment. Fig. 9 is a development view of the packaging bag 10 as seen from the surface that contacts the roll. Fig. 10 is a cross-sectional view taken along line AA in Fig. 9.

The packaging bag 10 has a paper layer 10A containing paper components and a heat seal layer 30 in which a heat seal agent is applied to one side of the paper layer 10A (Figure 10).

The packaging bag 10 also has a paper component ratio of 45% or more. Here, the paper component is, for example, plant fiber agglutinated (pulp). The pulp composition of the paper component is not limited, and may be, for example, a ratio of hardwood pulp to softwood pulp of 0:100 to 70:30, with a preferred pulp composition having a higher ratio of softwood pulp to hardwood pulp. Furthermore, recycled paper pulp may also be used as the pulp.

The material of the paper layer 10A that constitutes the packaging bag 10 is not particularly limited, but it can be made of, for example, kraft paper or rayon paper. Here, kraft paper is paper made from kraft pulp. Rayon paper is made by blending rayon fiber, which is chemically synthesized from wood pulp, into kraft pulp. Note that, from the perspective of achieving both softness and strength in the packaging bag 10, it is preferable that the rayon fiber content of the rayon paper be 20% or less by mass.

The basis weight of the paper layer 10A constituting the packaging bag 10 is not limited, but is preferably 10 g/m ² or more and 40 g/m ² or less, more preferably 15 g/m ² or more and 35 g/m ² or less, and even more preferably 20 g/m ² or more and 30 g/m ² or less. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

The thickness of the paper layer 10A that constitutes the packaging bag 10 is not limited, but is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 90 μm or less, and even more preferably 40 μm or more and 75 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014).

<Coating area of heat sealant>
Fig. 9 is a development view of the packaging bag 10 with a coating agent applied to the surface that contacts the roll. Fig. 10 is a cross-sectional view taken along the line A-A in Fig. 9. In the packaging bag, a heat seal agent is applied to one surface of the paper substrate (paper layer) 10A that contacts the roll, forming a heat seal layer 30.

In the example shown in Figure 9, the heat sealing agent is applied to the entire surface except for area 18. Area 18 includes areas where corners 23B and 23C (Figure 2) of roll 20 come into contact with the paper substrate when roll 20 is packaged in a packaging bag, as well as areas that face corners 23B and 23C but do not come into contact with them.

The width of region 18 is 5 to 20 mm, preferably 10 to 15 mm, so that the center of the width coincides with the ridge of the corner of roll 20. The length of region 18 depends on the number of rolls to be packaged, but it is preferable to form it so that it extends around the entire circumference of the roll to be packaged, including the corners of roll 20 that come into contact with the paper substrate.

In this way, the heat-sealing agent is not applied to the areas that come into contact with the corners 23A, 23B of the roll being wrapped, so the uncoated area 18 can be narrow and linear. As a result, the outline of the coated area does not become complex. In addition, because the coated area is reduced, the amount of heat-sealing agent to be applied can be reduced.

In Figure 9, reference numerals 11 to 15 correspond to those in Figure 1, which shows a package in which rolled sanitary tissue paper is contained in a packaging bag, and indicate the corresponding positions when the package 10 shown in Figure 1 is unfolded.

Known materials can be used as heat-sealing agents, and known coating methods such as printing techniques can be used.

In addition, the area to which the heat sealant is applied can be, for example, a rectangular area in the package 100 shown in Figure 1 that includes all of the areas where the packaging bag contacts the circumferential surface, top surface, and bottom surface of the roll when multiple rolls 20 are packaged, and this area can be the area to which the heat sealant is not applied.

By designating these rectangular areas as areas where the heat seal agent is not applied, the heat seal layer does not come into contact with any surface of the roll 20, including the corners, that it packages. Therefore, not only during the roll packaging process, but throughout the distribution and sale of the roll product, the roll does not come into contact with the heat seal layer of the packaging bag, so the appearance of the product is not marred by the heat seal agent.

In particular, if the heat-sealing agent is likely to adhere to the paper substrate due to the roll material and the properties of the heat-sealing agent, the area to which the heat-sealing agent is applied can be limited to a rectangular area that includes all of the areas where the packaging bag comes into contact with the periphery, top, and bottom of the roll when multiple rolls 20 are packaged. This prevents the heat-sealing agent from adhering to the roll. It also reduces the amount of heat-sealing agent used.

In the cross-sectional view of FIG. 10, the other surface of the packaging bag 10 remains made of paper.
A resin layer can be formed on another surface to function as a coating layer that protects the outer surface of the package. The resin layer can also be used as an area on the outer surface of the package 100 where a design or text can be printed.

The thermoplastic resin material contained in the printable area is not particularly limited, but is preferably low-density polyethylene. Low-density polyethylene may be either high-pressure low-density polyethylene (LDPE) or linear low-density polyethylene (L-LDPE).

Although the above describes an embodiment of the present invention, the present invention is not limited to a specific embodiment, and various modifications and variations are possible within the scope of the invention described in the claims.

100 Package 10 Packaging bag 10A Paper layer 10B, 10C Resin layer 18 Area where the heat sealing agent does not come into contact with the corner of the roll (area where the heat sealing agent is not applied)
20. Rolled sanitary tissue paper (roll)
21 Long sheet 21A Peripheral surface of roll 21B Upper surface of roll 21C Lower surface of roll 23B, 23C Corner portion of roll 30 Seal (heat seal layer)

Claims (4)

A packaging body for rolled sanitary thin paper, comprising a paper substrate for packaging multiple rolled sanitary thin paper, wherein the surface of the paper substrate that comes into contact with the multiple rolled sanitary thin paper is coated with a heat sealant, except for the areas where the corners formed by the peripheral surface and the top or bottom surface of the rolled sanitary thin paper come into contact with the paper substrate. The packaging for rolled sanitary tissue paper according to claim 1, wherein the plurality of rolled sanitary tissue paper rolls are packaged using a caramel method. The packaging for rolled thin sanitary paper according to claim 1 or 2, wherein when the multiple rolls of thin sanitary paper are stacked in at least two or more layers, the areas where the corners formed by the peripheral surface and the top or bottom surface of the rolled thin sanitary paper come into contact with the paper substrate are the corners formed by the peripheral surface and the top surface of the topmost roll of thin sanitary paper and the corners formed by the peripheral surface and the bottom surface of the bottommost roll of thin sanitary paper. A packaging body for rolled sanitary tissue paper according to any one of claims 1 to 3, wherein the plurality of rolled sanitary tissue paper rolls are either kitchen paper, paper towels, toilet paper, or tissue paper.