Sanitary paper packaging material and package

Abstract

To provide a packaging material that can easily wrap soft sanitary paper in alignment with its shape without damaging the paper and has sufficient strength for sanitary paper wrapping, and a package in which the sanitary paper is wrapped with the packaging material.SOLUTION: A sanitary paper packaging material includes a paper base material and a thermoplastic resin layer formed on one side of the paper base material, the sanitary paper packaging material has an ISO folding endurance of 50 - 100 times in the MD direction and an ISO folding endurance of 20 to 70 times in the CD direction, the smoothness of the surface of the paper base material on which the thermoplastic resin layer is formed is 2.0 - 9.0 seconds, the thickness of the paper base material is 75 to 100 μm, and the thickness of the thermoplastic resin layer is 15 - 50 μm.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a packaging material for toilet paper used for packaging toilet paper and a package in which the toilet paper is packaged with the packaging material for toilet paper.

Background Art

[0002] Toilet paper such as toilet tissue and paper towels has conventionally been packaged with a packaging material made of a plastic film. However, in recent years, due to the increasing environmental awareness, attempts have been made to use laminated paper with a thermoplastic resin laminated on paper as a packaging material for toilet paper. Since toilet paper such as toilet tissue and paper towels is a soft product, in Patent Document 1, by setting the ISO folding endurance in the MD direction of the paper-based packaging material to 200 to 1200 times, and in Patent Document 2, by setting the ISO folding endurance in the CD direction of the paper-based packaging material to 50 to 1500 times, it has been proposed to use a paper-based packaging material that is difficult to package a product that is originally soft as a packaging material for toilet paper. However, a paper-based packaging material that can easily package soft toilet paper along its shape and has sufficient strength for packaging toilet paper has not been developed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to solve the above problems, and to provide a packaging material that can easily package soft toilet paper along its shape without damaging it, and further has sufficient strength for packaging toilet paper, and a package in which the toilet paper is packaged with the packaging material.

Means for Solving the Problems

[0005] As a result of repeated studies to solve the above problems, the present inventors have found that by significantly reducing the number of double folds in the MD direction and the number of double folds in the CD direction of a laminated paper in which a thermoplastic resin layer is laminated on a paper substrate, even a soft toilet paper can be well packaged along its shape without damaging the toilet paper. Such a paper-based material with a small number of double folds was considered to lack sufficient strength to be used as a packaging material and could not be used as a packaging material conventionally. However, the packaging material found by the present inventors had sufficient strength as a packaging material for toilet paper. This is considered to be because the thermoplastic resin penetrates into the minute recesses on the surface of the paper substrate by reducing the smoothness of the paper substrate, and the paper substrate and the thermoplastic resin layer are combined. Even such a laminated paper with a small number of double folds was suitable for use as a packaging material. In addition, when using a paper-based packaging material, since the followability to the shape of toilet paper and the bendability are lower than those of a conventional plastic film, a conventional packaging device cannot be used, and it was necessary to newly introduce a packaging device or greatly change the packaging conditions. However, the packaging material found by the present inventors could be used with a packaging device used for a conventional plastic film without greatly changing the packaging conditions. The present invention has been completed in this way.

[0006] That is, the present invention is specified by the following matters. (1) A packaging material for toilet paper comprising a paper substrate and a thermoplastic resin layer formed on one side of the paper substrate, wherein the ISO number of double folds in the MD direction is 50 to 100 times, the ISO number of double folds in the CD direction is 20 to 70 times, the smoothness of the surface of the paper substrate on which the thermoplastic resin layer is formed is 2.0 to 9.0 seconds, the thickness of the paper substrate is 75 to 100 μm, and the thickness of the thermoplastic resin layer is 15 to 50 μm. (2) The packaging material for toilet paper according to (1) above, characterized in that the puncture strength is 2 to 7 N. (3) The packaging material for toilet paper according to (1) above, characterized in that the tensile strength in the MD direction is 1.7 to 2.5 kN / m and the tensile strength in the CD direction is 1.0 to 1.5 kN / m. (4) A package in which toilet paper is packaged with the packaging material for toilet paper according to any one of (1) to (3) above.

Advantages of the Invention

[0007] The packaging material of the present invention has softness, shape followability and bendability that can wrap along the shape of soft toilet paper without damaging it, and sufficient strength for packaging toilet paper. Therefore, it has excellent workability during packaging, the form of the package after packaging is good, and sufficient strength for carrying the package is obtained. The package of the present invention has a good form and sufficient strength for carrying.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] The packaging material for toilet paper of the present invention is a packaging material for toilet paper comprising a paper base material and a thermoplastic resin layer formed on one side of the paper base material, wherein the ISO folding endurance in the MD direction is 50 to 100 times, the ISO folding endurance in the CD direction is 20 to 70 times, the smoothness of the surface of the paper base material on which the thermoplastic resin layer is formed is 2.0 to 9.0 seconds, the thickness of the paper base material is 75 to 100 μm, and the thickness of the thermoplastic resin layer is 15 to 50 μm. Note that the ISO folding endurance in the MD direction and the ISO folding endurance in the CD direction above are the ISO folding endurance of the packaging material for toilet paper. The ISO folding endurance in the MD direction and the ISO folding endurance in the CD direction in the present invention can be measured using an MIT tester in accordance with JIS P 8115:2001. The smoothness of the paper base material in the present invention can be determined by the Bekk tester method in accordance with JIS P 8119:1998. In the present invention, the MD direction refers to the conveying direction of the packaging material for toilet paper, and the CD direction refers to the direction orthogonal to the MD direction. The thickness of the paper base material and the thickness of the thermoplastic resin layer in the present invention can be measured in accordance with JIS P 8118:2014.

[0010] As the paper base material in the present invention, there is no particular limitation as long as it is a paper having a smoothness of 2.0 to 9.0 seconds on the surface where the thermoplastic resin layer is formed, that is, at least one surface has a smoothness of 2.0 to 9.0 seconds and a thickness of 75 to 100 μm. From the viewpoint of improving the heat sealability, it is preferable that the smoothness of both surfaces of the paper base material is 2.0 to 9.0 seconds. By setting the smoothness of both surfaces of the paper base material to 2.0 to 9.0 seconds, the heat sealability between the thermoplastic resin layer and the surface of the paper base material without the thermoplastic resin layer when packaging toilet paper is improved. Further, as the paper base material in the present invention, in order to make the ISO folding endurance after forming the thermoplastic resin layer on one side within the range of the present invention, it is preferable to use a paper having an ISO folding endurance of 100 times or less in the MD direction and 70 times or less in the CD direction. For example, the ISO folding endurance in the MD direction can be 5 to 70 times, 5 to 50 times, 5 to 30 times, etc., and the ISO folding endurance in the CD direction can be 3 to 50 times, 3 to 30 times, 3 to 20 times, etc. The basis weight of the paper base material in the present invention is 20 to 70 g / m2 is preferred, and 25 to 50 g / m 2 is more preferred. Examples of such paper include paper manufactured from mechanical pulp as a raw material, paper manufactured from waste paper as a raw material, and the like. In the case of paper manufactured from mechanical pulp as a raw material, the raw material ratio of the mechanical pulp can be, for example, 60% by mass or more (the balance being chemical pulp or the like). In the case of paper manufactured from waste paper as a raw material, the raw material ratio of the waste paper can be, for example, 80% by mass or more. As the paper for the packaging material, paper generally manufactured from NBKP (bleached kraft pulp made from coniferous trees) and LBKP (bleached kraft pulp made from broad-leaved trees) is used. However, in the present invention, paper manufactured from waste paper can also be used. For example, paper manufactured from waste paper containing 10 to 50% by mass of mechanical pulp can be used. Examples of the waste paper include newsprint, magazines, miscellaneous papers, cardboard, and the like. Examples of the paper base material in the present invention include recycled paper, special recycled paper using 100% waste paper, and the like. Since the packaging material for the toilet paper of the present invention can use paper with a high usage ratio of mechanical pulp or paper using waste paper as the paper base material as described above, it can also achieve the effect of reducing the environmental load, such as reducing the amount of timber harvested and increasing the recycling of paper.

[0011] The thermoplastic resin in the present invention is not particularly limited as long as it can be melted by heat and laminated on a paper substrate. Generally, a resin used for lamination and having heat-sealing properties can be used. Examples of the thermoplastic resin in the present invention include polyolefin resins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon, polyvinyl chloride, polyvinylidene chloride, poly(meth)acrylate, etc., and these may be copolymers. Examples of the polyethylene in the present invention include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), etc., and ethylene-α-olefin copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-methacrylic acid copolymers, propylene-ethylene copolymers, etc. The thermoplastic resin layer in the present invention may be formed of one kind of thermoplastic resin or may be formed of two or more kinds of thermoplastic resins. Examples of the melting point of the thermoplastic resin in the present invention include 100 to 150 °C, etc. The smoothness of the surface of the thermoplastic resin layer is not particularly limited, and examples thereof include 30 to 200 seconds, 30 to 100 seconds, etc.

[0012] The packaging material for toilet paper of the present invention comprises a paper base material and a thermoplastic resin layer formed on one side of the paper base material, with the ISO folding endurance in the MD direction being 50 to 100 times, the ISO folding endurance in the CD direction being 20 to 70 times, the smoothness of the surface of the paper base material on which the thermoplastic resin layer is formed being 2.0 to 9.0 seconds, the thickness of the paper base material being 75 to 100 μm, and the thickness of the thermoplastic resin layer being 15 to 50 μm. Thus, it is possible to easily package soft toilet paper along its shape without damaging it, and furthermore, it can be made into a packaging material having sufficient strength for packaging toilet paper. Therefore, without introducing a new device for using a paper-based packaging material, it is possible to package toilet paper under the same conditions as packaging with a plastic film by using the packaging device that was used for packaging with a conventional plastic film. From the perspective of further improving such effects, the ISO folding endurance in the MD direction in the present invention is preferably 60 to 90 times, more preferably 70 to 90 times, the ISO folding endurance in the CD direction is preferably 20 to 60 times, more preferably 30 to 60 times, and even more preferably 30 to 50 times. The smoothness of the paper base material is preferably 3.0 to 9.0 seconds, more preferably 3.0 to 8.0 seconds, and even more preferably 3.0 to 7.0 seconds. Also, the thickness of the paper base material is preferably 75 to 90 μm, and the thickness of the thermoplastic resin layer is preferably 20 to 40 μm.

[0013] In the packaging material for toilet paper of the present invention, the puncture strength of the packaging material for toilet paper is preferably 2 to 7 N, more preferably 2 to 5 N, and even more preferably 2 to 4 N. The puncture strength in the present invention can be determined in accordance with JIS Z 1707:2019. In the packaging material for toilet paper of the present invention, the tensile strength in the MD direction of the packaging material for toilet paper is preferably 1.7 to 2.5 kN / m, more preferably 1.8 to 2.5 kN / m, the tensile strength in the CD direction is preferably 1.0 to 1.5 kN / m, and more preferably 1.1 to 1.5 kN / m. The tensile strength in the present invention can be determined in accordance with JIS P 8113:2006. In the packaging material for toilet paper of the present invention, since the smoothness of the surface of the paper base material is 2.0 to 9.0 seconds and a thermoplastic resin layer is provided thereon, even if the ISO folding endurance is a very low value compared to the conventional one, the sufficient tensile strength as described above can be obtained. Further, by setting the puncture strength to 2 to 7 N, when a perforation for opening is provided, the perforation can be easily opened. When the puncture strength is low, usually, during the packaging of toilet paper, during the packaging of the packaged product after packaging, during carrying, etc., the packaging material is likely to be torn. However, the packaging material for toilet paper of the present invention is excellent in bend processability during packaging, so it can prevent tearing (damage) during packaging. Furthermore, since the packaging material for toilet paper of the present invention is excellent in shape followability to the shape of toilet paper, toilet paper can be packaged without unnecessary slack, so the weight of toilet paper is not biased and applied to the packaging material. Therefore, even if the puncture strength is low, it can prevent the packaging material from being torn (damaged) during the packaging and carrying of the packaged product, etc.

[0014] In the packaging material for toilet paper of the present invention, the bending stiffness in the MD direction of the packaging material for toilet paper is preferably 100 to 200 μN·m, and the bending stiffness in the CD direction is preferably 40 to 100 μN·m. The bending stiffness in the present invention can be determined in accordance with JIS P 8125:2000. In the packaging material for toilet paper of the present invention, the tearing strength in the MD direction of the packaging material for toilet paper is preferably 550 to 800 mN, more preferably 600 to 750, the tearing strength in the CD direction is preferably 550 to 950 mN, and more preferably 600 to 900 mN. The tearing strength in the present invention can be determined in accordance with JIS P 8116:2000.

[0015] The manufacturing method of the packaging material for toilet paper of the present invention is not particularly limited. For example, a method of extruding a molten thermoplastic resin from a T-die and pressing it onto a paper substrate to form a thermoplastic resin layer on the paper substrate, a method of forming a thermoplastic resin layer by attaching a film containing a thermoplastic resin to the paper substrate, a method of forming a thermoplastic resin layer by coating a coating agent in which a thermoplastic resin is dissolved or dispersed in a solvent by roll coating, gravure coating, etc. can be mentioned.

[0016] Examples of the toilet paper in the present invention include toilet paper, paper towels, kitchen paper, tissue paper, etc. It may be in a roll form in which a long toilet paper sheet is wound into a roll, or may be in a state where it is folded and laminated so that one or several sheets can be taken out at a time. The package of the present invention is obtained by packaging the above toilet paper with the packaging material for toilet paper of the present invention. The packaging form of the package is not particularly limited, and examples thereof include caramel packaging, pillow packaging, gusset packaging, etc. The shape, number, etc. of the toilet paper in the package of the present invention are not particularly limited.

[0017] As a method of packaging toilet paper, there is no particular limitation, and for example, the following methods can be mentioned. When packaging a toilet paper roll with caramel wrapping, place the toilet paper roll on a conveyor so that its side faces are parallel to the MD direction, which is the conveyance direction of the toilet paper packaging material separately conveyed. At this time, both end faces of the toilet paper roll are parallel to the CD direction orthogonal to the MD direction. For example, when packaging 4 toilet paper rolls, arrange 2 toilet paper rolls in the MD direction and 2 in the CD direction on the conveyor so that they are in contact with each other. When packaging 6 toilet paper rolls, arrange 3 in the MD direction and 2 in the CD direction on the conveyor so that they are in contact with each other. The sheet-shaped toilet paper packaging material is conveyed above the toilet paper roll placed on the conveyor with the thermoplastic resin layer facing down, and is cut at a predetermined length in the CD direction above the toilet paper roll. Cover the cut toilet paper packaging material from above the toilet paper roll and wrap it from the side direction for packaging, and heat-seal the overlapping part of the toilet paper packaging material. Next, fold the toilet paper packaging material at both end portions of the toilet paper roll and heat-seal the overlapping part of the opposing toilet paper packaging materials. At this time, since the toilet paper packaging material of the present invention can package the toilet paper roll along the shape of the toilet paper roll, in the semi-circular portion on the outer side surface of the toilet paper roll, the toilet paper packaging material is in non-slack contact along the circumference of the toilet paper roll, and in the semi-circular portion on the inner side surface where the toilet paper packaging material does not contact, the toilet paper packaging material can be in a non-slack stretched state. Furthermore, at both ends of the toilet paper roll, the toilet paper packaging material bent at approximately a right angle can contact both end faces of the toilet paper roll. Since one sheet of toilet paper packaging material is folded in from the side direction and both end directions of the toilet paper roll, for example, if the side direction is loose, displacement will also occur at the folding parts at both ends. Therefore, it is necessary that the ISO folding endurance in both the MD direction and the CD direction satisfies the scope of the present invention. Even if only one direction satisfies the scope of the present invention, the packaging state from both directions cannot be improved well.

[0018] When packaging a toilet paper roll, the basis weight of the toilet paper is not particularly limited. For example, the basis weight of the toilet paper can be 8.0 to 25.0 g / m 2 , 15.0 to 19.0 g / m 2 and so on. Also, the winding length of the toilet paper roll, the winding density of the toilet paper roll, etc. are not particularly limited. For example, the winding length can be 25 to 300 m, and the winding density can be 0.1 to 0.5 g / cm 3 . When using the packaging material for toilet paper of the present invention, the winding length can be long, such as 100 to 300 m, 130 to 200 m, etc., or the winding density can be high, such as 0.2 to 0.5 g / cm 3 , 0.25 to 0.35 g / cm 3 and so on. Even a heavy toilet paper roll with a high mass per piece can be suitably packaged. When packaging a heavy toilet paper roll, it is usually considered that a packaging material with high strength and a large number of folding endurance is required. However, the packaging material for toilet paper of the present invention, on the contrary, can increase the followability to the shape of the toilet paper roll during packaging and reduce slack by reducing the ISO folding endurance, so that it can prevent the toilet paper roll from being easily torn due to uneven weight pressing on the packaging material or being damaged during packing into a cardboard box. Also, by reducing the smoothness of the paper base material, even a laminated paper with a small ISO folding endurance as in the present invention can have the tensile strength etc. sufficient for use as a packaging material by the composite of the unevenness on the surface of the paper base material and the thermoplastic resin. In the present invention, the winding density represents the mass per volume of the toilet paper roll excluding the core in the case of the cored type, and represents the mass per volume of the entire toilet paper roll in the case of the non-cored type.

[0019] Also, for example, after packaging, perforations may be formed in the CD direction or the MD direction in the packaging material for toilet paper. By setting the puncture strength of the packaging material for toilet paper to 2 to 7 N, it becomes easier to push open the perforations. Usually, when the puncture strength of the packaging material is lowered, the packaging material is likely to be torn. However, in the case of the present invention, since the packaging material for toilet paper is in close contact with the toilet paper roll, the load of the toilet paper roll is dispersed and applied to the entire packaging material for toilet paper, and the load of the toilet paper roll does not concentrate on a certain location as in the case of loose packaging. Therefore, even if the puncture strength is low, there is no risk of the packaging material for toilet paper being torn when packing, carrying, etc. Also, since the packaging material for toilet paper is in close contact with the toilet paper roll, when holding the semi-circular portion on the outer side surface of the toilet paper roll by hand, there is no looseness in the packaging material and it is easy to hold. Furthermore, since the surface of the packaging material for toilet paper is rough, it is easy to hold without slipping. In the above, the method of arranging the side surfaces of the toilet paper roll parallel to the MD direction has been described, but the same applies when the side surfaces of the toilet paper roll are arranged parallel to the CD direction. Fig. 1(a) shows an example in which six toilet paper rolls, three in the MD direction and two in the CD direction, are arranged such that their side surfaces are parallel to the MD direction, which is the conveyance direction of the packaging material for toilet paper. Fig. 1(a) is a schematic view seen from above the packaging material for toilet paper. Actually, the toilet paper roll cannot be seen from above the packaging material for toilet paper, but the position of the toilet paper roll is indicated by a dotted line.

[0020] For example, when wrapping a paper towel with the packaging material for toilet paper of the present invention, the packaging material for toilet paper is conveyed in the form of a sheet with the thermoplastic resin layer facing downwards. A bundle of paper towels with a predetermined number of folded paper towels stacked thereon is placed on a conveyor such that its long side is parallel to the MD direction, which is the conveyance direction of the packaging material for toilet paper being conveyed separately. At this time, the short side of the paper towel is parallel to the CD direction orthogonal to the MD direction. The sheet-shaped packaging material for toilet paper is conveyed above the paper towel placed on the conveyor with the thermoplastic resin layer facing downwards, and is cut at a predetermined length in the CD direction above the paper towel. The cut packaging material for toilet paper is placed over the paper towel, and the packaging material for toilet paper is bent almost at a right angle from the long side direction of the paper towel to wrap the paper towel in accordance with the shape of the paper towel, and the overlapping portion is heat-sealed. Next, the packaging material for toilet paper is folded in accordance with the shape of the paper towel in the short side direction of the paper towel, and the overlapping portion is heat-sealed. Since the packaging material for toilet paper of the present invention can wrap the paper towel along the shape of the paper towel, the paper towel can be wrapped without crushing or deforming the paper towel. Furthermore, since it is excellent in shape followability and bendability during packaging, it is not necessary to pre-fold the packaging material for toilet paper. Also, for example, after packaging, perforations may be formed in the MD direction in the packaging material for toilet paper. By setting the puncture strength of the packaging material for toilet paper to 2 to 7 N, it becomes easy to push open the perforations. Usually, when the puncture strength of the packaging material is lowered, the packaging material is likely to be torn. However, in the case of the present invention, since the packaging material for toilet paper has high followability to the shape of the paper towel and there is not much gap between the packaging material for toilet paper and the paper towel, the load of the paper towel does not concentrate on a certain place. Therefore, even if the puncture strength is low, there is no risk of the packaging material for toilet paper being torn when packing, carrying, etc. In the above, the method of arranging the long sides of the paper towel parallel to the MD direction has been described, but the same applies when the long sides of the paper towel are arranged parallel to the CD direction. Fig. 1(b) shows an example in which a bundle of folded paper towels is placed such that its long side is parallel to the MD direction, which is the conveyance direction of the packaging material for toilet paper.Figure 1(b) is a schematic view seen from above the packaging material for toilet paper. In reality, the paper towel cannot be seen from above the packaging material for toilet paper, but the position of the paper towel is indicated by a dotted line.

Example

[0021] Hereinafter, the present invention will be specifically described by way of examples of the present invention, but the technical scope of the present invention is not limited to these examples.

[0022] [Example] As the paper base material, a tissue paper with a thickness of 85 μm, a smoothness of 7.5 seconds on both sides, an ISO folding endurance of 11 times in the MD direction, and an ISO folding endurance of 7.1 times in the CD direction was prepared. On one side of the prepared paper base material, polyethylene resin (CAS number 9002-88-4, melting point 100 to 135 °C) was used as the thermoplastic resin, and the polyethylene resin was laminated by the extrusion lamination method. The thickness of the polyethylene resin layer in the obtained laminated paper was 30 μm, the folding endurance in the MD direction was 76 times, and the folding endurance in the CD direction was 42 times. Thus, the packaging material for toilet paper of the present invention was obtained. The puncture strength in the obtained laminated paper was 2.6 N, the tensile strength in the MD direction was 2.03 kN / m, and the tensile strength in the CD direction was 1.32 kN / m. Also, the bending stiffness in the MD direction of the obtained laminated paper was 157 μN·m, the bending stiffness in the CD direction was 52 μN·m, the tear strength in the MD direction was 706 mN, and the tear strength in the CD direction was 863 mN. The smoothness of the surface of the laminated surface was 56.8 seconds. The measurement of each property was carried out in accordance with the JIS described above.

[0023] (Packaging of toilet paper roll) Using the laminated paper obtained in the examples as a packaging material, six toilet paper rolls (3 in the MD direction × 2 in the CD direction) were arranged and packaged so that the sides of the toilet paper rolls were parallel to the MD direction, which is the conveying direction of the packaging material for toilet paper, by the method described above. The packaging was carried out using the same packaging apparatus as that used when packaging with a conventional plastic film, under the same conditions as when packaging with a plastic film, such as the conditions of the packaging paper feeding section, the packaging paper cutting section, the bottom sealing section, the left and right folding sections of the packaging paper, the side sealing section, etc. Also, perforations were formed in the CD direction around the approximate center in the MD direction (the portion corresponding to the second roll from the top among the three toilet paper rolls arranged in the MD direction). The basis weight of the toilet paper was 16 g / m 2 , the roll length was 170 m, and the density was 0.29 g / cm 3It was so. The workability during packaging was good, and the obtained toilet paper roll package was tightly packaged with no looseness of the packaging material in any direction of the side surface direction and both end surface directions of the toilet paper roll, and the shape of the package was good. The toilet paper roll packages produced in the same manner were boxed in a cardboard box using a case. The cardboard box used had an outer dimension of 47.9 cm in length, 47.9 cm in width, and 34.5 cm in height, and 8 toilet paper roll packages were packed in one cardboard box. Fig. 2(a) shows the state of boxing. The package (the leftmost figure in the upper row) placed so that there are 3 in the horizontal direction, 2 in the vertical direction, and 1 in the height direction (6 in total) is set upright so that there are 3 in the horizontal direction, 1 in the vertical direction, and 2 in the height direction (6 in total) (the second figure from the left in the upper row). Four packages set upright in the same way are arranged and set for boxing (the third figure from the left in the upper row). The set packages are inserted into a cardboard box placed with its side facing horizontally (the rightmost figure in the upper row). Similarly, the four packages set side by side are inserted into the empty part of the cardboard box into which the four packages have been inserted first. Thus, a total of 8 toilet paper roll packages were boxed in a cardboard box. In Fig. 2(a), the description of the lid part of the cardboard box is omitted. The package using the laminated paper obtained in the example as the packaging material had little looseness of the packaging material, so it was excellent in workability during boxing, and the packaging material did not tear. Also, with respect to the produced toilet paper roll package, the packaging material did not tear even when the side part (the part corresponding to the outer half circumference of the side of the toilet paper roll) was held in both hands and shaken. Also, the perforation could be easily opened by pressing the perforation. In this example, since the perforation is formed at the above position, by opening the perforation, the package can be divided into two parts, the upper part where the first roll from the top is packaged and the lower part where the second and third rolls from the top are packaged (the second roll from the top in the lower part protrudes from the packaging material and is easy to take), and all the rolls do not come apart even when opened, which is convenient for storage until use.

[0024] (Packaging of Paper Towel) Using the laminated paper obtained in the example as a packaging material, the folded paper towel was packaged in such a way that the long side of the folded paper towel was parallel to the MD direction, which is the conveyance direction of the packaging material for toilet paper, by the method described above. The packaging was carried out using the same apparatus as that conventionally used for packaging with a plastic film, under the same conditions as those for packaging with a plastic film, such as the conditions of the packaging paper feeding section, the packaging paper cutting section, the bottom sealing section, the left and right folding sections of the packaging paper, the side sealing section, the sewing section, etc. Also, a perforation was formed in the MD direction approximately at the center in the CD direction, with a length longer than the long side of the paper towel. The paper towel used was a paper towel with a length of 23 cm and a width of 22 cm (basis weight 37 g / m 2 ) folded in half at the center in the longitudinal direction and stacked 200 sheets. The workability during packaging was good, and there was no need to pre-fold. The obtained paper towel package was packaged with little slack in the packaging material in both the long side direction and the short side direction of the paper towel bundle, and the shape of the package was good. The paper towel packages produced in the same way were boxed in a cardboard box using a case. The cardboard box used had an outer dimension of length 23.6 cm, width 62.6 cm, and height 39.4 cm, and 30 paper towel packages were packed in one cardboard box. Figure 2(b) shows the state of boxing. Five paper towel packages were set side by side with their long sides in contact with each other for boxing (upper figure). The set packages were inserted from the top surface to the bottom surface of the cardboard box, and this was repeated 6 times to box 5 × 6 layers (30 in total) of paper towel packages in the cardboard box (lower figure). Note that the description of the lid part of the cardboard box is omitted in Figure 2(b). The package using the laminated paper obtained in the example as a packaging material had little slack in the packaging material, so it was excellent in workability during boxing and the packaging material did not tear. Also, for the produced paper towel package, the packaging material did not tear even when the heat-sealed part on the short side was held by hand and shaken. In addition, the perforation could be easily opened by pressing the perforation.

[0025] [Comparative Example 1] The ISO folding endurance in the MD direction is 1,800 times, the ISO folding endurance in the CD direction is 790 times, the bending strength in the MD direction is 280 μN·m, the bending strength in the CD direction is 188 μN·m, the smoothness is 13.16 seconds on the front surface and 13.21 seconds on the back surface, the thickness is 118 μm, and the basis weight is 75 g / m 2 The unbleached kraft paper was used as a packaging material, and the toilet paper roll was packaged in the same manner as when using the laminated paper obtained in the examples. However, unlike the laminated paper obtained in the examples, the kraft paper of Comparative Example 1 could not be bent along the shape of the toilet paper roll for packaging under the same conditions as when packaging with a plastic film.

[0026] [Comparative Example 2] The kraft paper with an ISO folding endurance of 730 times in the MD direction and 340 times in the CD direction was used as a packaging material, and the toilet paper roll was packaged in the same manner as when using the laminated paper obtained in the examples. However, unlike the laminated paper obtained in the examples, the kraft paper of Comparative Example 2 could not be bent along the shape of the toilet paper roll for packaging under the same conditions as when packaging with a plastic film.

[0027] [Comparative Example 3] The laminated paper (kraft paper laminated with a thermoplastic resin) with an ISO folding endurance of 910 times in the MD direction and 760 times in the CD direction was used as a packaging material, and the toilet paper roll was packaged in the same manner as when using the laminated paper obtained in the examples. However, unlike the laminated paper obtained in the examples, the laminated paper of Comparative Example 3 could not be bent along the shape of the toilet paper roll for packaging under the same conditions as when packaging with a plastic film. [Industrial Applicability]

[0028] The packaging material for toilet paper of the present invention can be suitably used as a packaging material for packaging toilet paper, paper towels, kitchen paper, tissue paper and other sanitary papers. Further, the package of the present invention in which sanitary papers such as toilet paper, paper towels, kitchen paper, tissue paper and the like are packaged has a good form, the packaging material is difficult to be torn (damaged), and it is suitable as a package of sanitary paper.

Explanation of reference numerals

[0029] 1 Packaging material for toilet paper 2 Toilet paper roll 3 Paper towel MD MD direction CD CD direction X Cutting part of the packaging material for toilet paper

Claims

1. A packaging material for toilet paper comprising a paper substrate and a thermoplastic resin layer formed on one side of the paper substrate, having an ISO folding endurance of 50 to 100 times in the MD direction and 20 to 70 times in the CD direction, a smoothness of 2.0 to 9.0 seconds on the surface of the paper substrate where the thermoplastic resin layer is formed, a thickness of the paper substrate of 75 to 100 μm, and a thickness of the thermoplastic resin layer of 15 to 50 μm.

2. The packaging material for toilet paper according to Claim 1, characterized in that the puncture strength is 2 to 7 N.

3. The packaging material for toilet paper according to Claim 1, characterized in that the tensile strength in the MD direction is 1.7 to 2.5 kN / m and the tensile strength in the CD direction is 1.0 to 1.5 kN / m.

4. A package in which toilet paper is packaged with the packaging material for toilet paper according to any one of Claims 1 to 3.

Images