Thin toilet paper packaging body and manufacturing method of thin toilet paper packaging body

Abstract

A thin toilet paper packaging body is a thin toilet paper packaging body in which thin toilet paper is contained in a packaging bag, wherein the packaging bag is made of only paper substrate, and the sealing part of the packaging bag is bonded with hot melt adhesive.

Description

Technical Field

[0001] This invention relates to a thin toilet paper packaging body and a method for manufacturing the thin toilet paper packaging body. Prior Technology

[0002] Thin toilet paper packages containing toilet paper, kitchen paper, etc., are distributed in a state where multiple sheet rolls are contained in a resin film packaging bag (e.g., Patent Document 1). In recent years, with the reduction of CO2 emissions and the promotion of plastic bans, a material made by laminating polyethylene (PE) onto paper has been used as the material for the packaging bag constituting the thin toilet paper package (e.g., Patent Document 2). [Previous Technical Documents] (Patent Documents)

[0003] Patent document 1: Japanese Patent Application Publication No. 2014-19467. Patent document 2: Japanese Patent Application Publication No. 2021-172415. Summary of the Invention

[0004] [The problem the invention aims to solve] Traditional thin toilet paper packaging uses a material that laminates polyethylene onto paper. While this reduces the amount of plastic used, it is not sufficient from the perspective of banning plastics. We hope to have thin toilet paper packaging that does not use resin.

[0005] The problem to be solved by the present invention is to provide a thin toilet paper packaging body, which adopts a packaging bag made of paper that does not substantially use resin. [Technical means to solve the problem]

[0006] One aspect of the present invention is a thin toilet paper packaging body in which thin toilet paper is contained in a packaging bag, wherein the packaging bag is made of only a paper substrate, and the sealing part of the packaging bag is bonded with a hot melt adhesive. [The effects of the invention]

[0007] According to one aspect of the present invention, a thin toilet paper packaging body can be provided, which adopts a packaging bag made of paper that does not substantially use resin. Simple Explanation of the Diagram

[0008] Figure 1 is a diagram showing a thin toilet paper package containing thin toilet paper inside a packaging bag. Figure 2 shows an example of thin toilet paper contained in a packaging bag. Figure 3 is a view of the thin toilet paper package in Figure 1 from the top side. Figure 4 is a view of the thin toilet paper package in Figure 1 from the bottom side. Figure 5 is a side view of the thin toilet paper package in Figure 1. Figure 6 is a side view of the thin toilet paper package in Figure 1 from the other side. Figure 7 is a view of the thin toilet paper package of Figure 1 from one end face. Figure 8 is a view of the thin toilet paper package in Figure 1 from the other end face. Figure 9 is a cross-sectional view of the packaging bag. Figure 10 is a diagram showing a portion of the manufacturing process of a thin toilet paper package. Figure 11 is a diagram showing a portion of the manufacturing process of a thin toilet paper package. Figure 12 is a diagram showing a portion of the manufacturing process of a thin toilet paper package. Figure 13 is a diagram showing a portion of the manufacturing process of a thin toilet paper package. Figure 14 is a diagram showing a portion of the manufacturing process of a thin toilet paper package. Implementation

[0009] <Thin toilet paper packaging> The embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, common parts may be marked with the same symbols and thus omitted from the description. Also, the scale of each component in each drawing may differ from the actual scale. Furthermore, in each drawing, a three-dimensional orthogonal coordinate system with three axes (X, Y, and Z) is used, with the long side of the packaging bag designated as the X-axis, the width direction as the Y-axis, and the height direction (vertical or thickness direction) designated as the Z-axis.

[0010] Figure 1 is a diagram showing a thin toilet paper package containing a sheet of paper inside a packaging bag according to an embodiment. Figure 2 is a diagram showing an example of thin toilet paper contained in a packaging bag. Figures 3, 4, 5, 6, 7, and 8 are diagrams showing the thin toilet paper package of Figure 1 viewed from the top side, bottom side, one side side, the other side side, one end side, and the other end side, respectively. The thin toilet paper package 100 is an example of a thin toilet paper package according to this embodiment, and includes a packaging bag 10 and a sheet roll 20.

[0011] <<Thin Toilet Paper>> The sheet roll 20 is an example of thin toilet paper contained in the packaging bag of this embodiment. As shown in FIG1, four sheet rolls 20 are contained in the packaging bag 10. As shown in FIG2, the sheet roll 20 is constructed by winding a long sheet 21 around a hollow shaft 22. Furthermore, the sheet is not limited to the sheet roll of this embodiment, but may also be a laminate of multiple sheets.

[0012] The form of the sheet roll 20 is not particularly limited; for example, it can be used for thin toilet paper, kitchen paper, tissues, wipes, etc. The application of the sheet roll 20 is not particularly limited; it can be used for industrial, household, or portable applications. Furthermore, among these, household toilet paper is suitable as the sheet roll 20 in this embodiment.

[0013] The outer surface 21A of the sheet roll 20 faces the top surface 11, bottom surface 12, side surface 13, and side surface 14 of the packaging bag 10, respectively. A portion of the outer surface 21A contacts a portion of the outer surface 21A of an adjacent sheet roll 20. Among the four sheet rolls 20, the two on the end face 15 side of the packaging bag 10 have their side surface 21B facing the end face 15 of the packaging bag 10, and the two on the end face 16 side of the packaging bag 10 have their side surface 21C facing the end face 16 of the packaging bag 10.

[0014] The dimensions of the sheet roll 20 are not particularly limited. The width dimension (roll width) L2 of the long sheet 21 in the width direction (Y direction) is preferably 85 mm or more and 300 mm or less. The radial 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 125 mm or less (see Figure 2).

[0015] There is no particular limitation on the number of layers of the long sheet 21. It can be set to more than one layer, preferably one or two layers (two sheets overlapping).

[0016] The material of the long sheet 21 is not particularly limited; for example, it can be paper, non-woven fabric, or cloth, but paper (paper sheet) is preferred. Furthermore, if the long sheet 21 is paper, it can be made from pulp as the main raw material. The pulp composition can be any well-known composition of paper. For example, the pulp blending ratio can be set to 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0017] Furthermore, the pulp composition in the long sheet 21 (paper sheet) is not particularly limited. For example, softwood pulps such as NBKP (coniferous kraft pulp) and NUKP (unbleached softwood pulp), and hardwood pulps such as LBKP (broadwood kraft pulp) and LUKP (unbleached hardwood pulp) can be used in any ratio.

[0018] Furthermore, there is no particular limitation on the ratio of hardwood pulp to softwood pulp, but it is preferably 10:90 to 80:20, and more preferably a pulp composition in which the proportion of softwood pulp is greater than that of hardwood pulp. Also, the pulp contained in the long sheet 21 (paper sheet) may also be recycled pulp.

[0019] The basis weight of the long sheet 21 is not particularly limited. Depending on the number of layers, for paper, it should be 5 g / m² or more and 80 g / m² or less, preferably 10 g / m² or more and 60 g / m² or less, and even more preferably 10 g / m² or more and 45 g / m² or less. For non-woven fabric, it is desirable to have 20 g / m² or more and 100 g / m² or less. Furthermore, the basis weight is measured according to the Japanese Industrial Standard JIS P 8124 (2011).

[0020] Furthermore, the thickness of the long sheet 21 (paper sheet) is not particularly limited, and the paper thickness can be measured under conditions conforming to Japanese Industrial Standard JIS P 8111 (1998). For example, if the long sheet 21 is paper, the thickness of each two layers of paper is... The size is 50μm or larger and 200μm or smaller, preferably 60μm or larger and 150μm or smaller, and even more preferably 80μm or larger and 100μm or smaller.

[0021] Alternatively, embossing can be performed on the long sheet 21 (paper). Such embossing can be carried out using well-known embossing methods.

[0022] Furthermore, the hollow core 22 is a cylindrical core wound around the long sheet 21 in the circumferential direction (R direction) (see Figure 2). The hollow core 22 may also include a structure without a core (coreless structure). The material of the hollow core 22 is not particularly limited; it can be paper, resin, etc.

[0023] The shape of the hollow core 22 is not particularly limited. For example, if the hollow core 22 is a paper tube (a paper core), it can be made of a single layer of thick paper, or it can be made of multiple layers of thick paper, or it can be made of coated thick paper base paper that has been pre-printed and coated with a deodorizing agent. Furthermore, the winding method of the paper tube is not particularly limited. For example, it can be a flat-rotated paper tube, a spirally wound paper tube (so-called a spiral paper tube), etc.

[0024] The dimensions of the hollow shaft 22 are not particularly limited. For example, the length of the long side (Y direction) of the hollow shaft 22 is the same as the width of the sheet roll 20 in the width direction (Y direction) (85 mm or more and 300 mm or less). Furthermore, the radial (X direction or Z direction) diameter of the hollow shaft 22 is 33 mm or more and 50 mm or less, preferably 35 mm or more and 41 mm or less (see Figure 2).

[0025] <<Packaging Bags>> Packaging bag 10 is an example of a packaging bag according to this embodiment. Packaging bag 10 is made of only one layer of paper substrate 10A (Fig. 9). That is, the proportion of paper in packaging bag 10 is 100% or more.

[0026] Here, paper is, for example, made by binding plant fibers together (pulp). The pulp composition of the paper is not limited; for example, the ratio of hardwood pulp to softwood pulp is 0:100 to 70:30, preferably a pulp composition with a higher proportion of softwood pulp than hardwood pulp. Furthermore, recycled pulp can also be used.

[0027] There are no particular limitations on the type of paper used for the substrate 10A of the packaging bag 10; for example, packaging paper can be used. Packaging paper is further classified as unbleached packaging paper or bleached packaging paper.

[0028] Examples of unbleached packaging paper include double-sided unprocessed kraft paper for heavy packaging, general double-sided unprocessed kraft paper, special double-sided unprocessed kraft paper, striped kraft paper, and single-sided veneer kraft paper.

[0029] Examples of bleached packaging paper include pure white roll paper, double-sided unprocessed bleached kraft paper, single-sided bleached kraft paper, and thin-film paper.

[0030] Among the paper used as the base material 10A of the packaging bag 10, single-sided gloss paper is preferred, and single-sided gloss kraft paper is even more preferred. Here, single-sided gloss paper can be obtained by heating and drying in a Yankee oven after papermaking, meaning a paper with one side becoming a glossy surface.

[0031] The basis weight of the paper used as the base material 10A of the packaging bag 10 is not limited, but it is preferably 30 g / m² or more and 100 g / m² or less. The basis weight is measured according to the provisions of Japanese Industrial Standard JIS P 8124 (2011). Furthermore, the basis weight of the paper used as the base material 10A of the packaging bag 10 is preferably varied according to the number of sheet rolls 20 contained in the packaging bag 10.

[0032] For example, if there are four sheet rolls 20 contained within the packaging bag 10, the basis weight of the paper used for the substrate 10A of the packaging bag 10 is preferably 30 g / m² or more and 60 g / m² or less. Furthermore, if there are twelve sheet rolls 20 contained within the packaging bag 10, the basis weight of the paper used for the substrate 10A of the packaging bag 10 is preferably 50 g / m² or more and 100 g / m² or less.

[0033] The thickness of the substrate 10A constituting 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 70 μm or less. Furthermore, the thickness is measured in accordance with the provisions of Japanese Industrial Standard JIS P 8118 (2014).

[0034] The packaging bag 10 has a top surface 11, a bottom surface 12, a side surface 13, a side surface 14, an end surface 15, and an end surface 16. Furthermore, in the packaging bag 10, the top surface 11 and the bottom surface 12 face each other in the vertical direction (Z direction), the side surface 13 and the side surface 14 face each other in the width direction (X direction), and the end surface 15 and the end surface 16 face each other in the long side direction (Y direction). Moreover, the end surfaces 15 and 16 are continuous with any one of the top surface 11, the bottom surface 12, the side surface 13, and the side surface 14 (Figures 1, 3-8).

[0035] Furthermore, the dimensions of the packaging bag 10 are not particularly limited. For example, the length L1 of the long side (Y direction) of the packaging bag 10 is 170mm or more and 600mm or less; the width W1 of the width direction (X direction) orthogonal to the long side (Y direction) of the packaging bag 10 is 160mm or more and 240mm or less; and the height H1 of the height direction (Z direction) is 160mm or more and 240mm or less. Moreover, the dimensions of this packaging bag 10 refer to the dimensions when four sheet rolls 20 are contained within the packaging bag 10.

[0036] In the packaging bag 10, the opening (not shown) of the packaging bag 10 can also be provided on at least one of the top surface 11, bottom surface 12, end surface 15, and end surface 16 of the packaging bag 10. Such an opening can be formed, for example, by first forming a slit line such as a perforated eyelet, and then making the slit line open.

[0037] Here, the term "cutting line for cracking" refers to a cutting line that alternately has cuts and connecting portions (the uncut portion between two cuts), whereby if the connecting portion breaks, the adjacent cuts become continuous cuts. Furthermore, the shape of the cuts of the cutting line for cracking is not particularly limited, but it is preferable that it penetrates the substrate 10A of the packaging bag.

[0038] In the packaging bag 10, vents (not shown) may be provided on at least any one of the top surface 11, bottom surface 12, side surface 13, side surface 14, end surface 15, and end surface 16 of the packaging bag 10. The vents can function as air pockets in the packaging bag 10. Furthermore, the number, shape, and size of the vents are arbitrary. Furthermore, the appearance of the vents is arbitrary, but it is preferable that they penetrate the substrate 10A of the packaging bag.

[0039] The packaging bag 10 has sealing portions 30, 40, and 50 (Figures 1, 4, 7, and 8). Sealing portions 30 and 40 are formed on the end faces 15 and 16 of the packaging bag 10 as side seals, and sealing portion 50 is formed on the bottom face 12 of the packaging bag 10 as a bottom seal.

[0040] The packaging form of the packaging bag 10 is not particularly limited. For example, it can be formed by processing the base material 10A of the packaging bag 10 into a cylindrical shape and sealing the cylindrical base material 10A (pillow packaging bag), forming a cylindrical packaging bag 10 by folding the two ends of the sheet and sealing it (candy packaging bag), or a packaging bag composed of these packaging forms. Furthermore, in the case of a pillow packaging bag, the cylindrical base material 10A can also be folded in a gusseted shape.

[0041] In the thin toilet paper packaging 100 of this embodiment, the packaging bag 10 is composed of a candy packaging bag. Specifically, the sealing portions 30 and 40 (side seals) of the end faces 15 and 16 are sealed in a folded state (Figs. 1, 2 to 8). Here, the candy packaging is formed by processing a packaging bag sheet (not shown) into a cylindrical shape and sealing (sealing) the open end of the cylindrical packaging bag sheet in a folded state (Figs. 1, 7, 8, 10 to 14).

[0042] In this embodiment, the sealing portions 30, 40, and 50 of the packaging bag 10 of the thin toilet paper packaging body 100 are bonded with a hot melt adhesive. Specifically, with the glossy surface of the single-sided glossy paper constituting the packaging bag 10 disposed on the outside of the packaging bag 10, the sealing portions 30, 40, and 50 are bonded with a hot melt adhesive (Figs. 1, 7-9).

[0043] Here, hot melt adhesive is a thermoplastic adhesive that is applied in a molten state by heating.

[0044] There are no particular limitations on the material of hot melt adhesives, but it is preferable that hot melt adhesives contain olefin resins or synthetic rubbers.

[0045] Examples of olefin resins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, and 4-methyl-1-pentene. These can be used alone or as copolymers of two or more.

[0046] Examples of synthetic rubbers include styrene-butadiene rubber (SBR), polybutadiene rubber (BR), chloroprene rubber (CR), isoprene rubber (IR), ethylene propylene rubber (EPM, EPDM), and nitrile rubber (NBR).

[0047] The coating method of the hot melt adhesive in the sealing portions 30, 40, and 50 of the packaging bag 10 is not particularly limited. Examples of coating methods for the hot melt adhesive include surface coating, droplet coating, and spray coating.

[0048] Furthermore, from the viewpoint of making it easier to apply the hot melt adhesive to the sealed portions 30, 40, and 50 of the packaging bag 10, droplet coating or spray coating is preferred as the coating method. Moreover, from the viewpoint of reducing the amount of hot melt adhesive used and suppressing unevenness after bonding, spiral spray coating is even more preferred.

[0049] In this embodiment, as described above, the packaging bag 10 is constructed solely of a paper substrate 10A, and the sealing portions 30, 40, and 50 of the packaging bag 10 are bonded together using a hot-melt adhesive. This provides a thin toilet paper packaging body 100 that utilizes a paper packaging bag 10 made without substantially using resin in the substrate 10A. Therefore, the thin toilet paper packaging body 100 obtained in this embodiment contributes to the ban on plastics.

[0050] Furthermore, in this embodiment, the sealing portions 30, 40, and 50 are formed with a hot-melt adhesive coated on the paper substrate 10A constituting the packaging bag 10. Therefore, even if the packaging bag 10 is a paper packaging bag that does not substantially use resin in the substrate 10A and therefore lacks flexibility, the sealing portions 30, 40, and 50 of the packaging bag 10 can be given high adhesion.

[0051] Furthermore, in this embodiment, the packaging bag 10 constituting the thin toilet paper packaging body 100 is a paper packaging bag 10 that substantially does not use resin in the substrate 10A. Therefore, when the sealing portions 30, 40, and 50 of the packaging bag 10 are formed, the molten resin does not adhere to the contained thin toilet paper (sheet roll 20). Consequently, the thin toilet paper (sheet roll 20) does not adhere to the sealing portions 30, 40, and 50 of the packaging bag 10.

[0052] In the thin toilet paper packaging 100 of this embodiment, as described above, the hot melt adhesive is sprayed in a spiral pattern, thereby locally applying the hot melt adhesive to the areas where the sealing portions 30, 40, and 50 are to be formed. This reduces the amount of hot melt adhesive used while suppressing unevenness in the applied hot melt adhesive. Therefore, in this embodiment, stable adhesion can be imparted to the sealing portions 30, 40, and 50.

[0053] In this embodiment, as described above, the hot melt adhesive contains an olefin resin, thus eliminating the need for heating when bonding the sealing portions 30, 40, and 50 with the hot melt adhesive, making the formation of the sealing portions 30, 40, and 50 easy. Furthermore, the hot melt adhesive contains a synthetic resin, thereby imparting viscoelasticity to the sealing portions 30, 40, and 50 and improving their adhesiveness.

[0054] In this embodiment, as described above, the basis weight of the substrate 10A of the packaging bag 10 is 30 g / m² or more and 100 g / m² or less, thereby maintaining the strength of the packaging bag 10. Therefore, according to this embodiment, even when the packaging bag 10 is constructed solely from a paper substrate 10A, a thin toilet paper packaging body 100 can be provided, which is constructed from a packaging bag 10 that is difficult to tear.

[0055] In this embodiment, as described above, the substrate 10A of the packaging bag 10 is formed of single-sided glossy paper, thereby enabling the glossy side of the single-sided glossy paper to be used as the printing surface. Therefore, according to this embodiment, even when the packaging bag 10 is constructed solely from a paper substrate 10A, printing can still be performed on the packaging bag 10.

[0056] In this embodiment, as described above, even if a paper packaging bag 10, which is essentially without resin in the substrate 10A and lacks flexibility, is used to package candy, high adhesion can be imparted to the sealing portions 30, 40, and 50 of the packaging bag 10. Therefore, it is possible to provide a thin toilet paper packaging body 100 that is difficult to break during manufacturing and transportation, and that the candy packaging bag 10 is difficult to peel off due to the sealing portions 30, 40, and 50. In this way, even if the thin toilet paper (sheet roll 20) is in a fluffy form such as a roll, it can be stably contained inside the packaging bag 10.

[0057] <Manufacturing Method of Thin Toilet Paper Packaging> The method for manufacturing the thin toilet paper packaging body according to this embodiment is a method for manufacturing the thin toilet paper packaging body 100 described above, in which only a paper substrate 10A is used in the packaging bag 10 and the sealing portions 30, 40, and 50 of the packaging bag 10 are bonded together with a hot melt adhesive.

[0058] Specifically, the sheet 60 used to form the packaging bag 10 is first moved (conveyed) on the manufacturing line, and a hot melt adhesive G1 for bottom sealing 50 is applied to the sheet 60 in the direction of movement (MD direction) (Fig. 10). At this time, the application position of the hot melt adhesive G1 is close to one end 61 of the direction orthogonal to the direction of movement (MD direction) of the sheet 60 (CD direction). Furthermore, the application pattern of the hot melt adhesive G1 is made into a spiral shape.

[0059] Then, thin toilet paper (4 sheet rolls 20) is placed on the underside of sheet 60 coated with hot melt adhesive G1 for bottom sealing 50. The arrangement of the thin toilet paper (4 sheet rolls 20) is as follows: the outer surface 21A of the 4 sheet rolls 20 faces the sheet 60, and the side surface 21B of 2 sheet rolls 20 faces the side surface 21B of the other 2 sheet rolls 20.

[0060] Then, the sheet 60 is wrapped around the outer surface 21A of the pre-arranged thin toilet paper rolls (4 sheet rolls 20). At this time, the other end 62 in the CD direction of the sheet 60 is attached to the area coated with hot melt adhesive G1. In this way, the sheet 60 is formed into a tubular shape while wrapping the thin toilet paper rolls (4 sheet rolls 20) (Fig. 11).

[0061] Then, the openings at both ends of the cylindrical sheet 60 (hereinafter referred to as the cylindrical sheet CL) (ends 63 and 64 in the MD direction of the sheet 60) are folded to form four flaps 65, 66, 67, and 68. Flaps 65 and 66 face each other in the left-right direction (HD direction) of the cylindrical sheet CL, and flaps 67 and 68 face each other in the up-down direction (VD direction) of the cylindrical sheet CL (Figure 12).

[0062] Furthermore, hot melt adhesive G2 for side sealing 30 and 40 is applied to flaps 65 and 66 (Fig. 12). At this time, the application position of hot melt adhesive G2 is close to the front end 65A of flap 65 and close to the front end 66A of flap 66. Also, the application pattern of hot melt adhesive G2 is made into a spiral shape.

[0063] Next, attach flap 67 to the areas of flaps 65 and 66 that have been coated with hot melt adhesive G2. Then, apply hot melt adhesive G3 for side seals 30 and 40 to the attached flap 67. At this point, the hot melt adhesive G3 is applied close to the front end 67A of flap 67 (Fig. 13). Furthermore, the hot melt adhesive G3 is applied in a spiral pattern.

[0064] Then, flap 68 is attached to the portion of flaps 65 and 66 that has been coated with hot melt adhesive G2 (the portion exposed after flap 67 is attached) and the portion of flap 67 that has been coated with hot melt adhesive G3. In this way, one of the openings of the tubular sheet CL is closed.

[0065] Similarly, if the opening on the other side of the tubular sheet CL is closed, a thin toilet paper package 100 (Fig. 14) can be obtained in which four sheets of toilet paper (rolls 20) are contained in a packaging bag 10. Furthermore, the packaging form of the packaging bag 10 constituting the obtained thin toilet paper package 100 becomes a candy package.

[0066] Furthermore, one opening of the tubular sheet CL, when closed, corresponds to the end face 15 (sealing part 30) of the packaging bag 10 (Figs. 7 and 13). The other opening of the tubular sheet CL, when closed, corresponds to the end face 16 (sealing part 40) of the packaging bag 10 (Figs. 8 and 14). Furthermore, in Figs. 11-14, for ease of understanding, the outline shape of the sheet 60 covering the thin toilet paper (4 sheet rolls 20) is shown as rectangular when viewed from the end face 15 or end face 16 side; however, the actual outline shape is an elliptical track shape as shown in Figs. 7 and 8.

[0067] Regarding the method for manufacturing the packaging bag according to this embodiment, only a paper substrate 10A is used in the packaging bag 10, and the sealing portions 30, 40, and 50 of the packaging bag 10 are bonded with hot melt adhesives G1, G2, and G3. In this way, a thin toilet paper packaging body that is the same as the thin toilet paper packaging body 100 described above can be obtained, and the same effect as the thin toilet paper packaging body described above can be obtained.

[0068] That is, according to the manufacturing method of the packaging bag of this embodiment, a thin toilet paper packaging body 100 can be obtained, which uses a paper packaging bag 10 that substantially does not use resin in the substrate 10A. Therefore, the thin toilet paper packaging body 100 obtained by the manufacturing method of this embodiment can help to ban plastics.

[0069] Furthermore, regarding the manufacturing method of the packaging bag in this embodiment, the sealing portions 30, 40, and 50 are formed by coating the paper substrate 10A constituting the packaging bag 10 with hot melt adhesives G1, G2, and G3. Therefore, the thin toilet paper packaging body 100 obtained by this embodiment can impart high adhesion to the sealing portions 30, 40, and 50 of the packaging bag 10 even if the packaging bag 10 using the substrate 10A is a paper packaging bag 10 that does not use resin and is not flexible.

[0070] Furthermore, regarding the manufacturing method of the packaging bag in this embodiment, the packaging bag 10 constituting the desired thin toilet paper packaging body 100 is made of paper that substantially does not use resin in the substrate 10A. Therefore, when forming the sealing portions 30, 40, and 50 of the packaging bag 10, the molten resin does not adhere to the contained thin toilet paper (sheet roll 20). Consequently, in the obtained thin toilet paper packaging body 100, the thin toilet paper (sheet roll 20) does not adhere to the sealing portions 30, 40, and 50 of the packaging bag 10. <Example>

[0071] The present invention will now be further described in detail using examples. The evaluation of the examples and comparative examples was conducted through the following tests.

[0072] [Test subject] As an experimental subject, a thin toilet paper packaging body was prepared, in which 4 sheet rolls 20 were packaged inside a candy bag. The sheet rolls were commercially available roll-shaped toilet paper (manufactured by Daio Paper Corporation, Elleair toilet paper, 60m, single layer, 147g / roll).

[0073] [Material per square meter] The mass per square meter (basic weight) of the test specimen was determined in accordance with the provisions of Japanese Industrial Standard JIS P 8124 (2011). The unit of mass per square meter is "g / m 2".

[0074] [Paper composition (ratio)] For the test specimen, calculate the percentage (%) of paper component in the base material of the packaging bag.

[0075] [Adhesiveness of the side seal] For the test specimen, evaluate the adhesion of the side seal. The evaluation is based on whether the side seal does not peel off when the test specimen is compressed by hand from the top and bottom of the packaging bag. If the side seal breaks or fails to adhere, it is rated as A (good).

[0076] [Side-sealed roll adhesion] For the test specimen, the adhesion of the side seal to the roll was evaluated. When the side seal was peeled off, a case where it was not attached to the sheet roll was rated A (good), and a case where it was attached to the sheet roll was rated B (poor).

[0077] [Bottom seal adhesiveness] For the test specimen, evaluate the adhesion of the bottom seal. The evaluation is performed by hand compressing the test specimen from the top and bottom of the packaging bag. If the bottom seal does not peel off, it is rated A (good); if the bottom seal breaks or fails to adhere, it is rated B (poor).

[0078] [Bottom-sealed roll adhesion] For the test specimen, the adhesion of the bottom seal to the roll was evaluated. When the bottom seal was peeled off, a case where it did not adhere to the roll of sheet material was rated A (good), and a case where it adhered to the roll of sheet material was rated B (poor).

[0079] [The fragility of the packaging bag] Compress the test specimen by hand from the top and bottom of the packaging bag to check for breakage. A bag that does not break is rated A (Good); a bag that does not break but lacks flexibility is rated B (Slightly Poor); and a bag that breaks is rated C (Poor).

[0080] The following describes the raw materials used in the relevant embodiments and comparative examples.

[0081] [Example 1] The packaging bags were constructed solely from a paper substrate (100% single-sided kraft paper with a basis weight of 40 g / m²), and the sealed portions (side seals and bottom seals) of the packaging bags were bonded using hot-melt adhesive. The hot-melt adhesive was sprayed in a spiral pattern. The composition, packaging conditions, and evaluation of Example 1 are shown in Table 1.

[0082] [Comparative Example 1] A three-layer packaging bag was constructed, with a base material of 30 g / m² synthetic fiber (chemical fiber blend) paper and a resin layer (20.5 g / m², 11 μm thick low-density polyethylene) formed on both sides of the base material. The sealing parts (side seal and bottom seal) of the packaging bag were welded together by heat sealing. The composition, packaging conditions, and evaluation of Comparative Example 1 are shown in Table 1.

[0083] [Comparative Example 2] A three-layer packaging bag was prepared, with its base material 10A made of kraft (insulating) paper with a basis weight of 30 g / m², and a resin layer (low-density polyethylene with a basis weight of 27.9 g / m² and a thickness of 15 μm) formed on both sides of the base material. Otherwise, test specimens were prepared and evaluated in the same manner as Comparative Example 1. The composition, packaging conditions, and evaluation of Comparative Example 2 are shown in Table 1.

[0084] [Comparative Example 3] A two-layer packaging bag was prepared, with substrate 10A made of synthetic fiber (chemical fiber blend) paper with a basis weight of 20 g / m², and a resin layer (low-density polyethylene with a basis weight of 10.2 g / m² and a thickness of 11 μm) formed on one side of the substrate. Otherwise, test specimens were prepared and evaluated in the same manner as Comparative Example 1. The composition, packaging conditions, and evaluation of Comparative Example 3 are shown in Table 1.

[0085] [Comparative Example 4] A two-layer packaging bag was prepared, with the substrate 10A made of kraft (insulating) paper with a basis weight of 30 g / m², and a resin layer (low-density polyethylene with a basis weight of 27.9 g / m² and a thickness of 30 μm) formed on one side of the substrate. Otherwise, test specimens were prepared and evaluated in the same manner as Comparative Example 2. The composition, packaging conditions, and evaluation of Comparative Example 4 are shown in Table 1.

[0086] [Table 1]

[0087] According to Table 1, the test specimen, which was constructed using only paper substrate to contain a packaging bag for thin toilet paper (4 sheet rolls) and the sealing part of the packaging bag was bonded with hot melt adhesive, achieved the goal of 100% paper, and the adhesion of the side seal, the adhesion of the side seal roll, the adhesion of the bottom seal roll, and the tear resistance of the packaging bag were all good (Example 1).

[0088] In contrast, the test specimens of Comparative Examples 1 to 4 all failed to achieve the target of 100% paper quality. Among them, the test specimens of Comparative Examples 3 and 4 had at least one of the following: side seal adhesion, side seal roll adhesion, bottom seal adhesion, and bottom seal roll adhesion.

[0089] The above describes the embodiments of the present invention. However, the present invention is not limited to specific embodiments. Various changes and modifications can be made within the scope of the invention as described in the claims.

[0090] The preferred embodiments of the present invention are described below.

[0091] The first aspect of the present invention is a thin toilet paper packaging body, which is a thin toilet paper packaging body in which thin toilet paper is contained in a packaging bag. The packaging bag is made only of paper substrate, and the sealing part of the packaging bag is bonded with hot melt adhesive.

[0092] In this specification, hot melt adhesive refers to a thermoplastic adhesive that is applied in a molten state by heating.

[0093] In the first embodiment, the packaging bag is made solely of a paper substrate, and the sealing portion of the packaging bag is bonded with a hot-melt adhesive. This provides a thin toilet paper packaging body that uses a paper packaging bag in which resin is substantially not used in the substrate. Therefore, the thin toilet paper packaging body obtained from the first embodiment can contribute to the ban on plastics.

[0094] Furthermore, in the first sample, the sealing portion is formed with a hot-melt adhesive coated on the paper substrate constituting the packaging bag. Therefore, even for paper packaging bags that do not substantially use resin in the substrate and lack flexibility, high adhesion can be imparted to the sealing portion of the packaging bag.

[0095] Furthermore, in the first state sample, the packaging bag constituting the thin toilet paper package is a paper bag made of paper in which resin is substantially not used in the substrate. Therefore, when the sealing part of the packaging bag is formed, the molten resin does not adhere to the thin toilet paper contained therein. Thus, the thin toilet paper does not adhere to the sealing part of the packaging bag.

[0096] The second embodiment of the present invention is a thin toilet paper packaging body as described in the first embodiment, wherein the aforementioned hot melt adhesive is sprayed in a spiral pattern.

[0097] In the second state sample, the hot melt adhesive is sprayed in a spiral pattern, thereby locally applying the hot melt adhesive to the area where the seal is to be formed. This reduces the amount of hot melt adhesive used while suppressing unevenness in the applied hot melt adhesive. Therefore, in the second state sample, stable adhesion can be imparted to the seal.

[0098] The third embodiment of the present invention is a thin toilet paper packaging body as described in the first or second embodiment, wherein the aforementioned hot melt adhesive comprises an olefin resin or a synthetic rubber.

[0099] In the third state sample, the hot melt adhesive contains an olefin resin, so heating is not required when bonding the seal with the hot melt adhesive, making the formation of the seal easy. Furthermore, the hot melt adhesive contains a synthetic resin, which imparts viscoelasticity to the seal, thereby improving its adhesion.

[0100] The fourth embodiment of the present invention is a thin toilet paper packaging body as described in any one of the first to third embodiments, wherein the basis weight of the aforementioned substrate is 30 g / m² or more and 100 g / m² or less.

[0101] In the fourth state sample, the basis weight of the packaging bag substrate is above 30 g / m² and below 100 g / m², thereby maintaining the strength of the packaging bag.

[0102] Therefore, according to the fourth state, even in the case where the packaging bag is made of only paper substrate, it is possible to provide a thin toilet paper packaging body that is made of a tear-resistant packaging bag.

[0103] The fifth embodiment of the present invention is a thin toilet paper packaging body as described in any one of the first to fourth embodiments, wherein the aforementioned substrate is formed from single-sided paper.

[0104] In this specification, single-sided glossy paper can be obtained by heating and drying in a Yankee drying cylinder after papermaking, indicating a type of paper with one side becoming a highly glossy surface.

[0105] In the fifth embodiment, the substrate of the packaging bag is made of single-sided glossy paper, thereby allowing the glossy side of the paper to be used as the printing surface. Therefore, according to the fifth embodiment, even when the packaging bag is made solely of a paper substrate, printing can be performed on the packaging bag.

[0106] The sixth embodiment of the present invention is a thin toilet paper packaging body as described in any one of the first to fifth embodiments, wherein the aforementioned packaging bag is packaged as a candy.

[0107] In this instruction manual, the milk candy packaging is a tubular packaging bag whose open end is sealed (sealed) while being folded.

[0108] In the sixth embodiment, even when a paper bag that lacks flexibility due to the absence of resin in the substrate is used to package candy, high adhesion can be imparted to the sealing portion of the bag. Therefore, a thin toilet paper package can be provided that is difficult to break during manufacturing and transportation, and is composed of a candy bag with a sealing portion that is difficult to peel off. Thus, according to the sixth embodiment, even if the thin toilet paper is in a fluffy form such as a roll, it can be stably contained within the packaging bag.

[0109] The seventh aspect of the present invention is a method for manufacturing a thin toilet paper package, which is a method for manufacturing a thin toilet paper package in which thin toilet paper is contained in a packaging bag. In the aforementioned packaging bag, only a paper substrate is used, and the sealing part of the aforementioned packaging bag is bonded with a hot melt adhesive.

[0110] In the seventh sample, only a paper substrate is used in the packaging bag, and the sealing part of the packaging bag is bonded with a hot melt adhesive. In this way, a thin toilet paper packaging body that is the same as the thin toilet paper packaging body described above can be obtained, and the same effect as the thin toilet paper packaging body described above can be obtained.

[0111] That is, in the seventh embodiment, a thin toilet paper packaging body can be provided, which uses a paper bag that substantially does not use resin in the substrate. Therefore, the thin toilet paper packaging body obtained from the seventh embodiment can contribute to the ban on plastics.

[0112] Furthermore, in the seventh embodiment, the sealing portion is formed with a hot-melt adhesive coated on the paper substrate constituting the packaging bag. Therefore, even if the packaging bag using the substrate is a paper packaging bag that does not actually use resin and is not flexible, high adhesion can be imparted to the sealing portion of the packaging bag constituting the thin toilet paper packaging body.

[0113] Furthermore, in the seventh state sample, the packaging bag constituting the thin toilet paper package is a paper bag that does not substantially use resin in the substrate. Therefore, when the sealing portion of the packaging bag constituting the thin toilet paper package is formed, the molten resin does not adhere to the contained thin toilet paper. Thus, in the thin toilet paper package, the thin toilet paper does not adhere to the sealing portion of the packaging bag.

[0114] This application claims priority based on Japanese Patent Application No. 2022-058502, filed on March 31, 2022, the entire contents of which are incorporated herein by reference.

[0115] 100: Thin toilet paper packaging 10: Packaging bags 10A: Substrate 11: Top surface 12: Bottom surface 13, 14: Side view 15, 16: End face 20: Sheet roll 21: Long strip sheet 21A: Peripheral surface 21B, 21C: Side view 22: Hollow shaft 30, 40: Sealing part (side seal) 50: Sealing section (bottom seal) OP: Open L1: Length L2: Roll width W1: Width W2: Drum diameter H1: Height 60: Sheet MD: Direction of movement CD: The direction orthogonal to the direction of movement. 61: One end of the CD direction 62: The other end in the CD direction 63: One end of the MD direction 64: The other end in the MD direction 65: Folded Piece 65A: Front-end 66: Folding 66A: Frontend 67: Folding 67A: Frontend 68: Folding 68A: Frontend

[0116] Domestic storage information (please note in order of storage institution, date, and number) none Overseas storage information (please note in the order of storage country, institution, date, and number) none

Claims

1. A thin toilet paper packaging body, wherein thin toilet paper is contained in a packaging bag; the packaging bag is made only of a paper substrate and has a sealing part, the sealing part being formed by processing the substrate into a cylindrical shape and sealing the open end of the cylindrical substrate in a folded state; the sealing part is bonded with a hot melt adhesive.

2. The thin toilet paper packaging as described in claim 1, wherein, The aforementioned hot melt adhesive was sprayed in a spiral pattern.

3. The thin toilet paper packaging as described in claim 1 or 2, wherein, The aforementioned hot melt adhesives contain olefin resins or synthetic rubbers.

4. The thin toilet paper packaging as described in claim 1 or 2, wherein, The basis weight of the aforementioned substrate is above 30g / m2 and below 100g / m2.

5. The thin toilet paper packaging as described in claim 1 or 2, wherein, The aforementioned substrate is formed from single-sided paper.

6. The thin toilet paper packaging as described in claim 1 or 2, wherein, The aforementioned packaging bag was wrapped in milk candy.

7. A method for manufacturing a thin toilet paper package, comprising manufacturing a thin toilet paper package containing thin toilet paper in a packaging bag, wherein only a paper substrate is used in the packaging bag; the substrate is processed into a cylindrical shape, and the open end of the cylindrical substrate is sealed in a folded state to form a sealing portion, and the sealing portion is bonded with a hot melt adhesive.

Images