Packaging

Abstract

To provide a packaging body for sanitary paper, comprising a packaging bag made of laminated paper having a paper base material and a heat-seal layer, wherein the packaging bag can be easily opened. [Solution] A packaging body comprising sanitary paper and a packaging bag for containing the sanitary paper, wherein the packaging bag is made of laminated paper having a paper base material and a heat-seal layer, the laminated paper has an opening, the heat-seal layer forms the inner surface of the packaging bag, and 0.942 g / cm³ 3 A packaging body made of a high-density thermoplastic resin having the above density.

Description

Technical Field

[0001] The present invention relates to a package for sanitary paper such as paper towels.

Background Art

[0002] As sanitary paper used for sanitary purposes, for example, disposable paper such as tissue paper and paper towels is widely used.

[0003] Among paper towels, those mainly used in the kitchen for draining and oil blotting of meat, fish, vegetables, etc.; as a lining on a cutting board; wiping dishes; wiping oil off a frying pan; cleaning a gas stove, ventilation fan, etc.; wiping stains on a dining table, etc. are also called kitchen paper (including cooking paper) and are well-known as a type of household paper.

[0004] Such sanitary paper is usually packaged in a plastic film packaging bag and sold on the market, but it has been proposed to use paper to make the packaging bag (Patent Document 1

[0017] ).

[0005] And Patent Documents 2 to 5 disclose a package in which sanitary paper is packaged with a packaging bag made of laminated paper including a paper base material and a thermoplastic resin layer as a heat seal layer.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document ы

Patent Document 3

Patent Document 4

Patent Document 5

[0007] Generally, packaging bags such as those disclosed in Patent Documents 2 to 5 are provided with an opening on a part of their surface, such as a perforation, which allows for the removal of sanitary paper. When removing sanitary paper from the packaging bag, for example, the opening is opened and an opening is formed by spreading the sides of the opening of the packaging bag in opposite directions with the fingers, and the sanitary paper is then removed from the opening.

[0008] However, in such cases, while a portion of the opening near the area being pushed open with a finger may open, the remaining portion of the opening away from that area may not open, or may be difficult to open. In such cases, it may be necessary to move the finger to the packaging bag on both sides of the remaining portion and repeat the pushing-opening process, or to push it open again with more force, making the process of creating the opening cumbersome.

[0009] The present invention aims to provide a packaging body for sanitary paper, comprising a packaging bag made of laminated paper having a paper base material and a heat-seal layer, in which the packaging bag can be easily opened. [Means for solving the problem]

[0010] As a result of diligent research, the inventors have discovered that in a packaging bag made of laminated paper comprising a paper base material and a heat-seal layer, the opening operation of the packaging bag can be easily performed by controlling the density of the thermoplastic resin constituting the heat-seal layer, and have completed the present invention.

[0011] The present invention Sanitary paper, and, Packaging bag for containing the aforementioned sanitary paper A packaging body equipped with, The aforementioned packaging bag is made of laminated paper having a paper base material and a heat-seal layer. The laminated paper has an opening, The heat-seal layer forms the inner surface of the packaging bag, and the temperature is 0.942 g / cm³. 3 This invention relates to a packaging material made of a high-density thermoplastic resin having the above density.

[0012] Preferably, the opening portion has perforations.

[0013] The aforementioned paper substrate is 10 g / m² 2 ~90g / m 2 It is preferable that it has a basis weight.

[0014] It is preferable that the aforementioned paper substrate is crepe paper.

[0015] The thickness of the heat seal layer is preferably 10 μm to 30 μm.

[0016] It is preferable that the hardness of the aforementioned high-density thermoplastic resin, as measured in accordance with JIS K 7215, is 50 or higher.

[0017] It is preferable that the high-density thermoplastic resin is a polyolefin.

[0018] It is preferable that the heat seal layer contains a lubricant.

[0019] It is preferable that the heat seal layer is an extruded coating layer.

[0020] The laminate paper further comprises an intermediate layer between the paper substrate and the heat-seal layer, The aforementioned intermediate layer is 0.925~0.940 g / cm³ 3 It is preferable that the material be made of a medium-density thermoplastic resin having a density of [density].

[0021] It is preferable that the hardness of the aforementioned medium-density thermoplastic resin, as measured in accordance with JIS K 7215, is 45 or higher.

[0022] The medium-density thermoplastic resin is preferably a polyolefin.

[0023] Preferably, the intermediate layer is an extruded coating layer.

[0024] It is preferable that the intermediate layer is adjacent to the paper substrate and the heat seal layer.

[0025] It is preferable that the paper substrate forms the outer surface of the packaging bag. [Effects of the Invention]

[0026] The packaging of the present invention is designed so that the opening of the packaging bag can be opened widely in one go, making it less likely that a portion of the opening will be opened while the rest remains unopened, or that it will be difficult to open. Therefore, after a portion of the opening is opened, it is possible to avoid or reduce the need to repeatedly move fingers to both sides of the unopened portion of the opening and spread it open, or to apply more force to spread it open again. Furthermore, because the opening of the packaging of the present invention is easy to open, there is no need to move fingers widely to open it, making it easy to open. Thus, the packaging of the present invention is designed so that the opening of the packaging bag can be opened widely in one go, and because there are fewer actions required to open it in the first place, the opening of the packaging bag can be easily performed.

[0027] Furthermore, the packaging of the present invention allows the opening of the packaging bag to be opened widely in one go, making it easy to prepare for removal of the sanitary paper and providing excellent usability.

[0028] Furthermore, the packaging of the present invention provides a crisp, satisfying opening sensation when the opening section is opened, resulting in a superior user experience.

[0029] Furthermore, if the heat-seal layer forming the inner surface of the packaging bag contains a lubricant, even if the heat-seal layer of the laminated paper is strongly pressed against the sanitary paper by external force from fingers or other objects when opening the packaging bag, friction between the heat-seal layer and the sanitary paper can be suppressed, making it easier for the laminated paper to move on the sanitary paper. Therefore, the opening process becomes easier.

[0030] The laminated paper has an intermediate layer between the paper base material and the heat-seal layer, and the intermediate layer has a density of 0.925 to 0.940 g / cm². 3 When made of a medium-density thermoplastic resin having a certain density, the intermediate layer is more flexible than the heat-seal layer and conforms better with the paper substrate. Therefore, the paper substrate and the heat-seal layer can be integrated more effectively through the intermediate layer.

[0031] If the laminated paper has an intermediate layer between the paper substrate and the heat-seal layer, and the heat-seal layer contains a lubricant while the intermediate layer does not, it is possible to suppress friction between the laminated paper and the sanitary paper while avoiding the influence of the lubricant on the adhesion between the paper substrate and the heat-seal layer.

[0032] When crepe paper is used as the paper base material, the elasticity of the packaging bag is increased, which improves its ability to follow deformation under external forces and thus suppresses tearing of the packaging bag.

[0033] If an anti-slip surface is present on at least a portion of the outer surface of the packaging bag, for example, when gripping the packaging bag with your fingers and opening the opening, it becomes possible to make the gripping area of ​​the packaging bag less slippery, thereby making the opening process even easier.

[0034] Furthermore, in this invention, the use of a heat-seal layer allows for heat sealing, thus facilitating the manufacture of the packaging.

[0035] Furthermore, since the packaging of the present invention uses a paper-based packaging bag, it can better address environmental problems such as environmental pollution caused by the residual plastic in the environment at the time of disposal, compared to the use of plastic film packaging bags.

[0036] Furthermore, since paper, used as the base material for packaging bags, is originally an organic material derived from plants and is a carbon-neutral, renewable resource, it can reduce the burden on the environment. Therefore, the packaging of the present invention is environmentally friendly. [Brief explanation of the drawing]

[0037] [Figure 1] A figure showing one embodiment of the packaging of the present invention. [Figure 2] Enlarged cross-sectional view of one aspect of laminated paper. [Figure 3] Enlarged cross-sectional view of another embodiment of laminated paper. [Figure 4] A diagram showing examples of locations where anti-slip coatings are installed. [Modes for carrying out the invention]

[0038] This invention Sanitary paper, and, Packaging bag for containing the aforementioned sanitary paper A packaging body equipped with, The aforementioned packaging bag is made of laminated paper having a paper base material and a heat-seal layer. The laminated paper has an opening, The heat-seal layer forms the inner surface of the packaging bag, and the temperature is 0.942 g / cm³. 3 This invention relates to a packaging material made of a high-density thermoplastic resin having the above density.

[0039] In the packaging of the present invention, the density of the thermoplastic resin constituting the heat-seal layer of the laminated paper forming the packaging bag is relatively high, and the heat-seal layer is relatively resistant to stretching. Therefore, the heat-seal layer is easily ruptured, and when it does rupture, it tends to rupture widely at once. For this reason, when the laminated paper comprising the paper base material and the heat-seal layer is equipped with an opening section such as a perforation, the opening section can be opened with fewer movements, and the opening section tends to rupture widely at once. Consequently, the packaging of the present invention makes it easy to open the packaging bag.

[0040] Furthermore, in the packaging of the present invention, the density of the thermoplastic resin constituting the heat seal layer is relatively high, and the heat seal layer is relatively resistant to stretching. Therefore, when opening the opening portion, the heat seal layer tears open, providing a crisp opening sensation and excellent usability.

[0041] The present invention will be described in more detail below. In the following, the term "consisting of" is synonymous with "including" unless otherwise specified.

[0042] [Sanitary paper] The packaging of the present invention includes sanitary paper. Sanitary paper is paper used for the purpose of improving hygiene, and examples include disposable papers such as tissue paper (also called face wipes or cosmetic paper), toilet paper, paper towels (kitchen paper, etc.), toilet paper, and wadding (paper cotton) (see, for example, the Paper and Pulp Technology Handbook, 5th edition, page 459, published January 30, 1992, edited and published by the Japan Paper and Pulp Technology Association). Sanitary paper is also called sanitary paper (JIS P0001:1998).

[0043] In this invention, paper towels such as kitchen paper are preferred as sanitary paper. Kitchen paper (including cooking paper) is mainly used in the kitchen for purposes such as draining water and oil from meat, fish, and vegetables; as a placemat for cutting boards; wiping dishes; wiping oil from frying pans; cleaning gas ranges and range hoods; and wiping dirt from dining tables.

[0044] Sanitary paper is porous and has the ability to absorb liquids. Examples of liquids include water and oil. Therefore, the sanitary paper used in this invention has water and oil absorbency and is suitable for use in kitchens, for example.

[0045] The sanitary paper is preferably dry. Here, "dry" means "free of air," and wet wipes such as wet tissues are not "dry." Therefore, it is preferable that the sanitary paper of the present invention is not a wet wipe.

[0046] The fiber material constituting the toilet paper is not particularly limited, and examples thereof include natural fibers such as cotton, wood pulp, and wool, regenerated fibers such as rayon, and synthetic fibers manufactured from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. These fibers may be used alone or in a mixed and composite form. As the fiber material constituting the toilet paper, wood pulp is preferable, and virgin wood pulp, waste paper pulp, or a mixture thereof can be used. As the wood pulp, for example, softwood pulp such as NBKP (softwood bleached kraft pulp) and NUKP (softwood unbleached pulp), and hardwood pulp such as LBKP (hardwood bleached kraft pulp) and LUKP (hardwood unbleached pulp) can be used alone or in a mixture at an appropriate ratio. For example, the ratio of softwood pulp to hardwood pulp can be 1 (25%): 3 (75%) to 1 (50%): 1 (50%).

[0047] The basis weight of the toilet paper is not particularly limited, but the basis weight (measurement method: JIS P8124

[2011] ) is preferably 10 g / m 2 ~100 g / m 2 and more preferably 30 g / m 2 ~50 g / m 2 Also, the paper thickness of the toilet paper is not particularly limited, but the paper thickness (measurement method: JIS P8118

[2014] ) is preferably 50 μm to 300 μm, and more preferably 80 μm to 200 μm.

[0048] The toilet paper used in the present invention preferably has unevenness on one surface or both surfaces. The unevenness may be present on a part of the surface of the toilet paper or on the entire surface of the toilet paper.

[0049] The unevenness is preferably imparted by embossing. The height of the unevenness (the vertical height from the bottommost surface of the concave portion to the apex of the convex portion) is not particularly limited, and for example, it may be 0.1 mm to 5 mm or 1 mm to 3 mm.

[0050] The form of the sanitary paper is not particularly limited, and it may be in the form of a roll wound from a long length of sanitary paper. However, it is preferable that the sanitary paper be in a non-roll form such as a flat sheet, and it is even more preferable that the flat sanitary paper be folded and placed inside the packaging bag. The sanitary paper may be used in the form of one sheet (so-called 1-ply) folded in half, or in the form of a set of two sheets (so-called 2-ply) or three or more sheets (so-called 3-ply) of laminated structure folded in half and used in the same way as a single sheet.

[0051] It is preferable that the sanitary paper is contained in the packaging bag in a pop-up manner. With a pop-up manner, after removing one sheet of sanitary paper from the packaging bag, a portion of the next sheet of sanitary paper is exposed, making it easy to remove the next sheet.

[0052] It is preferable that the sanitary paper used is not clothing such as diapers, adult incontinence pants, or infant training pants.

[0053] [Packaging bag] The packaging of the present invention comprises a packaging bag for containing sanitary paper. The packaging bag has an outer surface and an inner surface that faces the sanitary paper.

[0054] The packaging bag of the present invention is retractable, and upon opening, the sanitary paper inside the packaging bag can be removed from the opening. In other words, the packaging bag of the present invention allows for the removal of sanitary paper upon opening.

[0055] The packaging bag may be double-layered or more, but a single layer is preferable in terms of ease of opening.

[0056] The shape of the packaging bag is not particularly limited; for example, it can be non-box-shaped or box-shaped. Furthermore, it is preferable for the packaging bag to be deformable in order to improve handling, such as ease of packaging and transport.

[0057] The packaging bag in this invention preferably has at least one air vent. The air vent has the function of expelling air from inside the packaging bag to the outside, and by expelling air from inside the packaging bag to the outside, the volume of the packaging bag can be reduced, for example, making it easier to pack the packaging bag.

[0058] Air holes can be formed, for example, by piercing laminated paper or a packaging bag made of laminated paper with at least one needle or the like.

[0059] The number of air holes is not particularly limited, but multiple holes are preferred, preferably 2 to 100 per packaging bag, and more preferably 10 to 50.

[0060] The (cross-sectional) shape of the air vent is not limited. For example, the shape of the air vent can be circular or non-circular, and an example of a non-circular air vent shape is a short slit.

[0061] The spacing between the air vents is not particularly limited. For example, the spacing between the air vents can be in the range of 10 mm to 50 mm, preferably in the range of 15 mm to 40 mm, and more preferably in the range of 20 mm to 30 mm.

[0062] The density of air vents is not particularly limited. For example, the density of air vents can be 1 to 10 per 25 cm² on a surface where air vents are present. 2 It can be within the range of 2-8 pieces / 25cm 2 A range of 3-6 pieces / 25cm is preferred. 2 A range is more preferable.

[0063] The distribution of air vents can be uniform or non-uniform, but for example, if the packaging bag is box-shaped, it is preferable to form them on the sides of the packaging bag.

[0064] Multiple air holes may be arranged in a straight line to form one or more rows of air holes. The spacing between the rows of air holes is not limited, but for example, it can be 5mm to 50mm, 10mm to 40mm, or 15mm to 30mm.

[0065] [Laminating paper] The packaging bag in the present invention is made of laminated paper having a paper base material and a heat-seal layer. The weight ratio of the paper base material to the laminated paper is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more.

[0066] In this invention, since the packaging bag is formed using laminated paper comprising a paper base material and a heat-seal layer, the strength of the packaging bag can be improved compared to when the packaging bag is formed using only a paper base material.

[0067] Furthermore, in this invention, since laminated paper with a paper base material is used, the laminated paper is easy to fold, and for example, it is easy to make the packaging bag into a gusseted bag with a so-called "gusset".

[0068] The thickness of the laminate paper used in this invention (measurement method: JIS P8118

[2014] ) is preferably 30 μm to 200 μm, and more preferably 70 μm to 150 μm.

[0069] The basis weight of the laminate paper used in this invention is 30 g / m². 2 ~120g / m 2 Preferably, 40 g / m 2 ~100g / m 2 This is preferable.

[0070] The density of the laminate paper used in this invention is 0.40 g / cm³. 3 ~1.00g / cm 3 Preferably, 0.50 g / cm³ 3 ~0.70g / cm 3 This is preferable.

[0071] The laminated paper used in this invention is provided with an opening. The opening, when opened, forms an outlet for dispensing the sanitary paper.

[0072] The number of openings is not particularly limited, and the laminated paper may have one or more openings.

[0073] The form of the opening is not particularly limited; any form is possible as long as the laminated paper can be opened, however, it is preferable that the opening has perforations.

[0074] The shape of the opening portion is not particularly limited and can be a straight line, a curve, or a combination thereof. A straight shape is preferable in terms of ease of opening. Therefore, if the opening portion has perforations, it is preferable that the perforations are provided in a straight line.

[0075] The location of the opening is not particularly limited and can be placed at any position on the packaging of the present invention. For example, if the packaging of the present invention is substantially box-shaped, the opening can be provided on one of the surfaces constituting the substantially box shape, and it is preferable to provide the opening on the top surface of the substantially box-shaped packaging.

[0076] (Paper base material) The laminate paper used in this invention comprises a paper base material.

[0077] The paper substrate is the base material for laminated paper and is a flat sheet. The number of paper substrates that make up the laminated paper is not particularly limited, but it is preferable that the laminated paper consists of a single sheet of paper substrate. The paper substrate in this invention is not heat-sealable.

[0078] The paper base material is made of paper. The paper used for the paper base material is 10g / m². 2 ~90g / m 2 It is preferable that the paper has a basis weight (measurement method: JIS P8124

[2011] ). Furthermore, the basis weight of the paper should be 15 g / m². 2 ~80g / m 2 Preferably, 20 g / m 2 ~70g / m 2 This is preferable.

[0079] The paper thickness of the paper substrate (measurement method: JIS P8118

[2014] ) is preferably 20 μm to 300 μm, and more preferably 50 μm to 200 μm.

[0080] When paper having the above basis weight and / or paper thickness is used as the base material, the laminated paper used in the present invention has particularly excellent flexibility and can be highly deformable because the paper base material is thin paper. Therefore, the packaging bag of the present invention formed from laminated paper with thin paper as the base material has excellent deformation-following ability against external forces and is also tear-resistant.

[0081] The fibrous materials that make up the paper substrate are not particularly limited and can include natural fibers such as cotton, wood pulp, and wool; regenerated fibers such as rayon; and synthetic fibers made from synthetic polymers such as vinylon, nylon, polyester, polyethylene, polypropylene, and acrylic. These fibers may be used individually or mixed and compounded.

[0082] From the viewpoint of environmental protection, it is preferable that the paper substrate substantially does not contain synthetic fibers, and more preferably substantially does not contain thermoplastic resin fibers. Therefore, if the paper substrate contains synthetic fibers, especially thermoplastic resin fibers, the amount of synthetic fibers is preferably less than 25% by weight, more preferably less than 15% by weight, and even more preferably less than 5% by weight. It is particularly preferable that the paper substrate does not contain synthetic fibers (especially thermoplastic resin fibers).

[0083] As the fibrous material constituting the paper base material, only natural fibers or recycled fibers are preferred, and only wood pulp is more preferred. As the wood pulp, virgin wood pulp, recycled paper pulp, or mixtures thereof can be used. As the wood pulp, for example, softwood pulp such as NBKP (bleached softwood kraft pulp) and NUKP (unbleached softwood pulp), hardwood pulp such as LBKP (bleached hardwood kraft pulp) and LUKP (unbleached hardwood pulp), and mixtures of softwood pulp and hardwood pulp can be used.

[0084] The paper base material is preferably crepe paper. Crepe paper has numerous wrinkles, and therefore possesses excellent elasticity. Thus, by using crepe paper as the paper base material, the packaging bag of the present invention can have high deformability. In particular, by using crepe paper as the paper base material, the packaging bag of the present invention becomes highly elastic and its ability to follow deformation against external forces is improved, thereby suppressing tearing of the packaging bag.

[0085] The basis weight of crepe paper (measurement method: JIS P8124

[2011] ) is 20 g / m². 2 ~90g / m 2 Preferably, 25 g / m 2 ~70g / m 2 More preferably, 30g / m 2 ~50g / m 2 That is even more preferable.

[0086] The thickness of crepe paper (measurement method: JIS P8118

[2014] ) is preferably 50 μm to 300 μm, and more preferably 80 μm to 200 μm.

[0087] Crepe paper can be manufactured by conventionally known methods. For example, it can be manufactured by pressing wet paper onto the surface of a heated cylindrical Yankee dryer, allowing it to adhere, and then, after a certain period of drying, peeling the paper off the Yankee dryer via a doctor blade to perform the crepe process.

[0088] When crepe paper is used as the paper base material, the contact points between the packaging bag and the sanitary paper are reduced, further suppressing snagging of the sanitary paper on the packaging bag. Therefore, packaging of the items to be packaged can be made easier.

[0089] (Heat seal layer) The laminate paper used in this invention comprises a heat-seal layer along with the paper base material.

[0090] Since the laminate paper used in this invention is equipped with a heat-seal layer, the packaging can be easily manufactured by heating and melting the heat-seal layer and, for example, fusing the heat-seal layers together to seal them.

[0091] Furthermore, when using thin paper with relatively low thermal insulation properties as the paper substrate, the process of applying heat from the back of the thin paper to melt the heat seal layer present on the surface of the thin paper and heat sealing can be easily carried out.

[0092] The heat seal layer does not need to be present over the entire surface of the paper substrate; it is sufficient if it is present over at least a portion of the surface (e.g., the edges), but it is preferable if it is present over the entire surface. Furthermore, the heat seal layer may be present on both sides of the paper substrate, but it is preferable if it is present on one surface.

[0093] In the packaging of the present invention, the heat-seal layer forms the inner surface of the packaging bag. The heat-seal layer may form a portion of the inner surface of the packaging bag, but it is preferable that it forms the entire inner surface.

[0094] The sanitary paper used in this invention has excellent water and oil absorption properties, and therefore possesses high porosity, making it relatively prone to fraying. For this reason, when a paper packaging bag comes into contact with the sanitary paper, the sanitary paper tends to get caught in the packaging bag, making the packaging process difficult. However, the packaging bag of this invention has an inner surface formed from a heat-seal layer, and the surface of the heat-seal layer is smoother than that of paper. As a result, the sanitary paper is less likely to get caught in the packaging bag, making the packaging process for the sanitary paper easier.

[0095] The thickness of the heat seal layer is not particularly limited, but it can be, for example, 10 μm to 30 μm.

[0096] The thickness of the heat seal layer is preferably 10 μm or more, more preferably 11 μm or more, and even more preferably 12 μm or more. On the other hand, the thickness of the heat seal layer is preferably 25 μm or less, more preferably 20 μm or less, and even more preferably 15 μm or less. In other words, the thickness of the heat seal layer is preferably 10 μm to 25 μm, more preferably 11 μm to 20 μm, and even more preferably 12 μm to 15 μm.

[0097] The heat seal layer has a density of 0.942 g / cm². 3 It is made of a high-density thermoplastic resin having the above density.

[0098] In this invention, "high-density thermoplastic resin" refers to a resin with a density of 0.942 g / cm³ as measured in accordance with JIS K7112 (Method A). 3 This refers to any thermoplastic resin that meets the above criteria. A single type of high-density thermoplastic resin may be used, or multiple types of high-density thermoplastic resins may be used in combination.

[0099] The type of high-density thermoplastic resin is 0.942 g / cm³. 3 As long as it has the density mentioned above, it is not particularly limited, and for example, polyolefins such as polyethylene and polypropylene can be used.

[0100] The polyolefin preferably consists of at least one olefin having 2 to 10 carbon atoms. Two or more olefins may be used in combination. Specific examples of olefins include ethylene, propylene, and α-olefins.

[0101] Examples of polyolefins include ethylene homopolymers or copolymers, propylene homopolymers or copolymers, and butene homopolymers or copolymers. They may also be random copolymers or block copolymers of ethylene and propylene.

[0102] The polyolefin is preferably a homopolymer or copolymer of ethylene. The ethylene copolymer is preferably a copolymer of ethylene and propylene and / or an α-olefin, and more preferably a copolymer of ethylene and an α-olefin. The α-olefin includes those having 3 to 20 carbon atoms, preferably 3 to 8. Examples include 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, vinylcyclohexane, etc., but 1-hexene is preferred. The polyolefin is particularly preferably a copolymer of ethylene and propylene, a copolymer of ethylene and 1-butene, or a copolymer of ethylene, propylene, and 1-butene.

[0103] The high-density thermoplastic resin has a density of 0.942 g / cm³ as measured in accordance with JIS K7112. 3 Preferably, it is a high-density polyolefin having a density of 0.942 g / cm³ as measured in accordance with JIS K7112. 3 It is more preferable that the polyethylene is of the above high density.

[0104] The density of high-density thermoplastic resins, as measured according to JIS K7112, is, for example, 0.970 g / cm³. 3 It can be as follows: 0.965 g / cm³ 3 The following is preferable: 0.960 g / cm³ 3 The following are preferable.

[0105] As high-density polyethylene, any polyethylene can be used as long as it has a density within the above range, for example, Novatec® HD manufactured by Nippon Polyethylene Co., Ltd. The high-density thermoplastic resin used in this invention is preferably Novatec® HD HS471, which is high-density polyethylene.

[0106] When using the high-density thermoplastic resin described above, the heat-seal layer is relatively resistant to stretching, making it prone to tearing. Furthermore, when the heat-seal layer tears, it tends to tear widely in one go. Therefore, if the laminated paper, which comprises a paper substrate and a heat-seal layer, has an opening such as a perforation, the opening can be opened with fewer movements, and the opening tends to tear widely in one go. Consequently, the opening of the packaging bag made of laminated paper can be easily performed.

[0107] Furthermore, when using the high-density thermoplastic resin mentioned above, the heat-seal layer is relatively resistant to stretching, resulting in a crisp opening feel and superior usability. Moreover, the packaging bag can be opened wide in one go, further enhancing the user experience.

[0108] The high-density thermoplastic resin preferably has a hardness (durometer D) of 55 or higher, preferably 60 or higher, and more preferably 65 or higher, as measured in accordance with JIS K7215.

[0109] The hardness (durometer D) of the high-density thermoplastic resin, as measured in accordance with JIS K7215, is preferably 80 or less, more preferably 75 or less, and even more preferably 70 or less.

[0110] When using a high-density thermoplastic resin having the specific hardness described above, packaging bags made from this laminated paper possess particularly excellent rigidity, further improving ease of opening and user experience upon opening.

[0111] (Middle class) The laminate paper used in this invention has a layer of 0.925 to 0.940 g / cm² between the paper base material and the heat seal layer. 3 The material may further include an intermediate layer made of a medium-density thermoplastic resin having a density of [density].

[0112] Since medium-density thermoplastic resin has a lower density than high-density thermoplastic resin, the intermediate layer is more flexible than the heat-seal layer and conforms better to the paper substrate. Therefore, the paper substrate and the heat-seal layer can be integrated more effectively through the intermediate layer.

[0113] The thickness of the above-mentioned intermediate layer is not particularly limited, but for example, it can be 10 μm to 30 μm.

[0114] The thickness of the above intermediate layer is preferably 10 μm or more, more preferably 11 μm or more, and even more preferably 12 μm or more. On the other hand, the thickness of the above intermediate layer is preferably 25 μm or less, more preferably 20 μm or less, and even more preferably 15 μm or less. That is, the thickness of the above intermediate layer is preferably 10 μm to 25 μm, more preferably 11 μm to 20 μm, and even more preferably 12 μm to 15 μm.

[0115] In this invention, "medium-density thermoplastic resin" refers to a resin with a density of 0.925 to 0.940 g / cm³ as measured in accordance with JIS K7112 (Method A). 3 This refers to any thermoplastic resin within the specified range. A single type of medium-density thermoplastic resin may be used, or multiple types of medium-density thermoplastic resins may be used in combination.

[0116] The types of medium-density thermoplastic resins are 0.925 to 0.940 g / cm³. 3 As long as it has a density within the specified range, it is not particularly limited, and for example, polyolefins such as polyethylene and polypropylene can be used.

[0117] The polyolefin preferably consists of at least one olefin having 2 to 10 carbon atoms. Two or more olefins may be used in combination. Specific examples of olefins include ethylene, propylene, and α-olefins.

[0118] Examples of polyolefins include ethylene homopolymers or copolymers, propylene homopolymers or copolymers, and butene homopolymers or copolymers. They may also be random copolymers or block copolymers of ethylene and propylene.

[0119] The polyolefin is preferably a homopolymer or copolymer of ethylene. The ethylene copolymer is preferably a copolymer of ethylene and propylene and / or an α-olefin, and more preferably a copolymer of ethylene and an α-olefin. The α-olefin includes those having 3 to 20 carbon atoms, preferably 3 to 8. Examples include 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, vinylcyclohexane, etc., but 1-hexene is preferred. The polyolefin is particularly preferably a copolymer of ethylene and 1-hexene or a copolymer of ethylene, propylene, and 1-hexene.

[0120] Medium-density thermoplastic resins have a density of 0.925 to 0.940 g / cm³ as measured in accordance with JIS K7112. 3 It is preferably a medium-density polyolefin, with a density of 0.925 to 0.940 g / cm³ as measured in accordance with JIS K7112. 3 It is more preferable that the material be medium-density polyethylene.

[0121] The density of medium-density thermoplastic resins, as measured according to JIS K7112, is, for example, 0.930 to 0.939 g / cm³. 3 It can be expressed as 0.932~0.938 g / cm³. 3 Preferably, 0.934~0.937 g / cm³ 3 This is preferable.

[0122] As the medium-density polyethylene, any polyethylene can be used as long as it has a density within the above range, for example, Novatec® LD manufactured by Nippon Polyethylene Co., Ltd. In the present invention, Novatec® LD HC170, which is a medium-density polyethylene, is preferred as the medium-density thermoplastic resin.

[0123] When using the above-mentioned medium-density thermoplastic resin, the integration between the paper substrate and the heat-seal layer is improved, while the laminated paper maintains its overall resistance to stretching. As a result, the laminated paper is easier to tear, and when it does tear, it tends to tear widely in one go. Therefore, if the laminated paper has an opening such as a perforation, the opening can be opened with fewer movements, and the opening tends to be opened widely in one go. Consequently, the opening of packaging bags made of laminated paper can be easily performed.

[0124] Furthermore, when using the above-mentioned medium-density thermoplastic resin, the integration between the paper substrate and the heat-seal layer is improved, while the laminate paper maintains its overall resistance to stretching. This allows for a crisp opening sensation during the opening process, resulting in a superior user experience. Moreover, the opening of the packaging bag can be opened widely in one go, further enhancing the user experience.

[0125] The medium-density thermoplastic resin preferably has a hardness (durometer D) of 45 or higher, preferably 50 or higher, and more preferably 55 or higher, as measured in accordance with JIS K7215.

[0126] The hardness (durometer D) of the medium-density thermoplastic resin, as measured in accordance with JIS K7215, is preferably 75 or less, more preferably 70 or less, and even more preferably 65 or less.

[0127] When using a medium-density thermoplastic resin having the specific hardness described above, packaging bags made from this laminated paper possess particularly excellent rigidity, further improving ease of opening and user experience upon opening.

[0128] If the above-mentioned intermediate layer is present, the combined thickness of the heat seal layer and the intermediate layer is preferably 20 μm or more, more preferably 22 μm or more, and even more preferably 24 μm or more. On the other hand, the combined thickness of the heat seal layer and the above-mentioned intermediate layer is preferably 50 μm or less, more preferably 40 μm or less, and even more preferably 30 μm or less. In other words, the combined thickness of the heat seal layer and the above-mentioned intermediate layer is preferably 20 μm to 50 μm, more preferably 22 μm to 40 μm, and even more preferably 24 μm to 30 μm.

[0129] The intermediate layer is preferably adjacent to the paper substrate and the heat seal layer. That is, it is preferable that one surface of the intermediate layer is in contact with the paper substrate and the other surface of the intermediate layer is in contact with the heat seal layer.

[0130] When the above-mentioned intermediate layer is adjacent to the paper substrate and the heat seal layer, the combined thickness of the intermediate layer and the heat seal layer is preferably 20 μm or more, more preferably 21 μm or more, and even more preferably 22 μm or more. On the other hand, the combined thickness of the above-mentioned intermediate layer and the heat seal layer is preferably 27 μm or less, more preferably 26 μm or less, and even more preferably 25 μm or less. In other words, the combined thickness of the above-mentioned intermediate layer and the heat seal layer is preferably 20 μm to 27 μm, more preferably 21 μm to 26 μm, and even more preferably 22 μm to 25 μm.

[0131] (additional layer) The laminate paper used in the present invention may comprise a paper substrate and a heat-seal layer, as well as layers other than the intermediate layer described above. For example, any additional layers such as an adhesive layer may be provided between the paper substrate and the heat-seal layer, or between the paper substrate and the intermediate layer, and / or between the intermediate layer and the heat-seal layer. Furthermore, any additional layers such as a protective layer or a printed layer may be provided on the surface of the paper substrate that does not face the heat-seal layer.

[0132] The packaging bag in this invention does not necessarily need to have a gas barrier layer to prevent the permeation of water vapor, oxygen, etc. Examples of gas barrier layers include metal layers such as aluminum layers.

[0133] Therefore, the laminated paper does not need to have a metal layer as an additional layer.

[0134] The packaging bag in the present invention does not necessarily have to include a polyester layer or a polyamide layer. An example of a polyester layer is a polyethylene terephthalate layer. An example of a polyamide layer is a nylon layer.

[0135] Therefore, the laminate paper does not need to have a polyester layer or a polyamide layer as an additional layer.

[0136] The laminate paper used in this invention has a thermoplastic resin layer of 0.942 g / cm². 3 A heat seal layer made of high-density polyethylene having the above density, or 0.942 g / cm³ 3 A heat-seal layer made of high-density polyethylene having the above density, and 0.925~0.940 g / cm³ 3 It is preferable to have only an intermediate layer made of medium-density polyethylene having a density of [density].

[0137] (Additives) The paper substrate and / or the heat-seal layer and / or the intermediate layer may contain any additives. Examples of additives include various lubricants, organic or inorganic fillers, tackifiers, antioxidants, anti-fogging agents, various organic or inorganic pigments, flame retardants, crosslinking agents, UV inhibitors, and the like.

[0138] The heat seal layer preferably contains a lubricant. A single type of lubricant may be used, or multiple types of lubricants may be used in combination.

[0139] Any type of lubricant can be used, including inorganic, organic, or inorganic / organic composite lubricants. Organic lubricants are preferred in terms of compatibility with thermoplastic resins. Examples of organic lubricants include fatty acid amides, fatty acids, fatty acid esters, and waxes, but fatty acid amides are preferred.

[0140] Examples of fatty acid amides include unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, saturated fatty acid amides such as behenic acid amide, stearic acid amide, palmitic acid amide, myristic acid amide, lauric acid amide, caprylic acid amide, and capric acid amide, as well as combinations thereof. Erucic acid amide is preferred.

[0141] The amount of lubricant is not particularly limited, but based on the total weight of the thermoplastic resin composition constituting the heat seal layer, it can be, for example, in the range of 0.1 to 1% by weight, preferably 0.2 to 0.8% by weight, and more preferably 0.3 to 0.6% by weight.

[0142] In this invention, since the heat-seal layer forms the inner surface of the packaging bag, if the heat-seal layer contains a lubricant, even if the heat-seal layer of the laminated paper is strongly pressed against the sanitary paper by external force from fingers or the like when opening the packaging bag, friction between the heat-seal layer and the sanitary paper can be suppressed, and the laminated paper moves easily on the sanitary paper. Therefore, the opening process becomes easier.

[0143] When laminated paper includes an intermediate layer between the paper substrate and the heat-seal layer, it is preferable that the heat-seal layer contains a lubricant while the intermediate layer does not. This ensures the slipperiness of the laminated paper on sanitary paper while avoiding the influence of the lubricant on the adhesion between the paper substrate and the heat-seal layer, thereby preventing a decrease in adhesion between the paper substrate and the heat-seal layer due to the lubricant.

[0144] (others) In this invention, it is preferable that the paper substrate is located on the outer surface side of the packaging bag. This makes it easy to recognize that the packaging bag of this invention is made of paper.

[0145] In the packaging bag of the present invention, it is preferable that an anti-slip feature is present on at least a portion of the outer surface of the packaging bag. The type of anti-slip feature is not particularly limited; for example, a member having an anti-slip function can be installed on the outer surface of the packaging bag, or irregularities having an anti-slip function can be formed on the outer surface of the packaging bag.

[0146] When anti-slip material is installed on a part of the outer surface of the packaging bag, the installation location of the anti-slip material is not particularly limited and can be any location on the outer surface of the packaging bag, however, the area around the opening is preferred. For example, if the opening has perforations, it is preferable to install multiple anti-slip material on both sides of the perforations.

[0147] As an anti-slip measure, a slip-resistant layer with a slip-resistant surface is preferred. The constituent materials of the slip-resistant layer are not particularly limited, and various inorganic and / or organic materials can be used, but organic materials are preferred, and natural resins and / or synthetic resins are more preferred. As for the synthetic resin, a synthetic resin different from the thermoplastic resin constituting the heat seal layer is preferred.

[0148] The surface shape of the anti-slip layer is not particularly limited and can be any shape such as a circle, ellipse, or square. The color of the anti-slip layer is also not particularly limited and can be white, black, various chromatic colors, or transparent.

[0149] The anti-slip layer is preferably a coating film, and more preferably a varnish-cured layer. The type of varnish is not particularly limited; a single type of varnish may be used, or multiple types of varnish may be used in combination. As the varnish, for example, an organic solvent solution of a resin such as urethane resin, alkyd resin, or epoxy resin can be used. A varnish-cured layer can be formed by partially applying the varnish to the outer surface of the packaging bag and allowing it to dry and harden.

[0150] If the outer surface of the packaging bag is made of paper, at least a portion of the paper material may be impregnated with varnish and allowed to dry and harden to provide a non-slip surface. The impregnation method is not particularly limited; for example, the varnish may simply be applied to the outer surface of the paper material.

[0151] If an anti-slip surface is present on at least a portion of the outer surface of the packaging bag, for example, when gripping the packaging bag with your fingers and opening the opening, it becomes possible to make the gripping area of ​​the packaging bag less slippery, thereby making the opening process even easier.

[0152] (Method of manufacturing laminated paper) The method for manufacturing the laminated paper used in the present invention is not particularly limited. For example, it can be manufactured by extruding the material constituting the heat seal layer in layers from an extruder to form a heat seal layer, integrating the paper substrate and the heat seal layer via an intermediate layer by extrusion lamination, or by integrating the film constituting the heat seal layer and the paper substrate with an adhesive. The method of integrating the paper substrate and the heat seal layer by extrusion lamination is preferred. That is, it is preferable that the heat seal layer is an extruded coating layer.

[0153] When laminated paper has an intermediate layer, it can be manufactured by, for example, extruding the material constituting the heat seal layer and the material constituting the intermediate layer in layers from separate extruders to form the heat seal layer and the intermediate layer, thereby integrating the paper substrate and the heat seal layer via the intermediate layer, or by integrating the film constituting the heat seal layer, the film constituting the intermediate layer, and the paper substrate with an adhesive. The method of integrating the paper substrate and the heat seal layer via the intermediate layer by extrusion lamination is preferred. That is, it is preferable that the intermediate layer and the heat seal layer are extruded coating layers.

[0154] [Manufacturing method for packaging] The method for manufacturing the packaging of the present invention is not particularly limited. For example, a flat laminated paper can be deformed into a bag shape having a storage compartment and an opening, sanitary paper can be placed in the storage compartment, and then the opening can be sealed by heat sealing to manufacture the packaging.

[0155] The heat sealing temperature depends on the material of the heat sealing layer, but is preferably 160°C to 350°C, more preferably 180°C to 300°C, and even more preferably 200°C to 250°C.

[0156] The heat sealing time also depends on the material of the heat sealing layer, but it is preferably 5 seconds or less, more preferably 3 seconds or less, and even more preferably 1 second or less.

[0157] The packaging of the present invention can be manufactured by any of the conventionally known packaging methods, such as pillow packaging, gusset packaging, or caramel packaging.

[0158] In pillow packaging, for example, sanitary paper is wrapped in laminated paper to form a tube, the ends of the laminated paper are overlapped, and the overlapped portion is heat-sealed (center seal) to form a cylinder. The cylindrical laminated paper is then heat-sealed again (end seal) perpendicular to the direction of travel of the cylindrical laminated paper, according to the length (height) of the bag, and each bag is cut at this resealed portion. This allows the packaging of the present invention to be manufactured.

[0159] In gusset packaging, for example, sanitary paper is wrapped in laminated paper to form a tube, the ends of the laminated paper are overlapped, and the overlapped portion is heat-sealed (center seal) to form a cylinder. The sides of the bottom portion or the opening portion are folded inward to create a gusset according to the length (height) of the bag, and the cylindrical laminated paper is heat-sealed again (end seal) perpendicular to the direction of travel of the cylindrical laminated paper. The packaging of the present invention can be manufactured by cutting each bag at this sealed portion.

[0160] For example, in caramel packaging, the present invention can be manufactured by wrapping sanitary paper in laminated paper to form a tube, overlapping the ends of the laminated paper, and heat-sealing (center-sealing) the overlapped portion to form a cylinder, or by introducing sanitary paper from one end of laminated paper that has been pre-formed into a tube by heat-sealing (center-sealing), folding two opposing flap-shaped edges of the laminated paper that protrude from both ends of the sanitary paper toward each other, then similarly folding two other opposing flap-shaped edges toward each other, and then heat-sealing these folded portions.

[0161] [Instructions for using the packaging] The packaging of the present invention can be used to package sanitary paper, and can maintain the sanitary paper in a hygienic state.

[0162] In the packaging of the present invention, an opening for dispensing sanitary paper is formed by opening a retractable opening, and the sanitary paper can be taken out from this opening and used.

[0163] The method for opening the opening is not particularly limited, but if the opening has perforations, for example, the opening can be opened by spreading the sides of the opening of the packaging bag apart in opposite directions with your fingers.

[0164] [Example of packaging] Figure 1 shows one embodiment of the packaging of the present invention, where Figure 1(A) and Figure 1(B) show the front and back sides of one embodiment of the packaging of the present invention, respectively. Figure 1(C) is a cross-sectional view taken along line AA of Figure 1(A).

[0165] In Figure 1, 1 represents the packaging body, 2 is the packaging bag for the packaging body, and 3 is the sanitary paper contained in the storage compartment within the packaging bag 2. In the embodiment shown in Figure 1, the packaging bag 2 is made of laminated paper having a paper base material and a heat-seal layer. In the embodiment shown in Figure 1, the packaging bag 2 is formed by heat-sealing a part (edge) of the laminated paper and is packaging the sanitary paper 3.

[0166] The packaging bag 2 has multiple air holes 4, allowing air inside the packaging bag 2 to be released to the outside. By releasing the air inside the packaging bag 2 to the outside through the air holes 4, the volume of the packaging bag 2 can be reduced, making it easier to pack and transport the packaging bag 2, for example.

[0167] In the embodiment shown in Figure 1, a straight perforation 2-1 is formed on a part of the surface of the packaging bag 2 as an opening for removing the sanitary paper 3. When removing the sanitary paper 3, the perforation 2-1 is cut to form the opening, and the sanitary paper 3 can be removed to the outside from this opening.

[0168] In the embodiment shown in Figure 1, the sanitary paper sheets 3 are stacked in a so-called pop-up manner and stored inside the packaging bag 2. Therefore, when one sheet of sanitary paper 3 is removed from the opening, a portion of the next sheet of sanitary paper 3 can protrude from the opening, making it easy to remove the sanitary paper sheets 3.

[0169] Figure 2 is an enlarged cross-sectional view of one embodiment of laminated paper, showing an embodiment in which laminated paper comprises a paper substrate and a heat-seal layer.

[0170] In the embodiment shown in Figure 2, the laminated paper 5 comprises a paper substrate 5-1 and a heat seal layer 5-2 present on one of the surfaces of the paper substrate 5-1. The heat seal layer 5-2 is an extruded coating layer formed by extrusion lamination on the surface of the paper substrate 5-1. The heat seal layer 5-2 has a density of 0.942 g / cm³. 3 It is preferably made of a high-density thermoplastic resin having the above density and containing a lubricant.

[0171] The laminated paper 5 shown in Figure 2(A) consists only of a paper base material 5-1 and a heat-seal layer 5-2. The heat-seal layer 5-2 forms the inner surface and faces the sanitary paper 3 side shown in Figure 1, while the paper base material 5-1 forms the outer surface.

[0172] When using laminated paper 5 as the packaging bag 2 in Figure 1, the strength of the packaging bag 2 is improved and tearing of the packaging bag 2 can be suppressed compared to when using a packaging bag 2 made only of paper base material 5-1.

[0173] Furthermore, in the above case, since the heat-seal layer 5-2 shown in Figure 2 faces the sanitary paper 3, during packaging, the sanitary paper 3 comes into contact with the smooth surface of the heat-seal layer 5-2 and does not come into contact with the paper substrate 5-1. This prevents the sanitary paper 3 from getting caught on the packaging bag 2. Therefore, the packaging body 1 can maintain the packaging of the sanitary paper 3 well, and packaging is easy.

[0174] In Figure 2, if the heat seal layer 5-2 contains a lubricant, even if the heat seal layer 5-2 is strongly pressed against the sanitary paper (not shown) by external force from fingers or the like when opening the packaging bag, friction between the heat seal layer 5-2 and the sanitary paper can be suppressed, and the laminate paper 5 moves easily on the sanitary paper. Therefore, the opening of the packaging is easy.

[0175] Furthermore, in the embodiment shown in Figure 2(B), a transparent anti-slip layer 6 made of a varnish-cured layer is formed on the surface of the paper substrate 5-1 opposite to the surface that the heat-seal layer 5-2 contacts, and as shown in Figure 4, the anti-slip layer 6 is installed on both sides of the perforation 2-1. Therefore, when the laminated paper 5 shown in Figure 2(B) is used in the packaging bag 2 shown in Figure 4, when gripping the anti-slip layer 6 of the packaging bag 2 with fingers or the like and spreading both sides of the perforation 2-1 to cut the perforation 2-1 and open the bag, it becomes possible to make the gripping area of ​​the packaging bag 2 less slippery, making the opening process even easier.

[0176] In the embodiment shown in Figure 2(B), the anti-slip layer 6 is directly formed on the surface of the paper substrate 5-1. However, other layers, such as a protective layer or a printed layer, may be present between the paper substrate 5-1 and the anti-slip layer 6, as needed. Furthermore, these other layers are not limited to the space between the paper substrate 5-1 and the anti-slip layer 6, but may be present at any position on the surface of the paper substrate 5-1.

[0177] Figure 3 is an enlarged cross-sectional view of another embodiment of laminated paper, showing an embodiment in which laminated paper comprises a paper base material, a heat-seal layer, and an intermediate layer.

[0178] In the embodiment shown in Figure 3, the laminated paper 5 comprises a paper substrate 5-1 and an intermediate layer 5-3 and a heat seal layer 5-2 located on one surface of the paper substrate 5-1. The intermediate layer 5-3 and the heat seal layer 5-2 are extruded coating layers formed by extrusion lamination applied to the surface of the paper substrate 5-1. The intermediate layer 5-3 and the heat seal layer 5-2 are adjacent to each other.

[0179] In the configuration shown in Figure 3, the intermediate layer 5-3 is 0.925~0.940 g / cm³. 3 It is made of a medium-density thermoplastic resin having a density and does not contain a lubricant. On the other hand, the heat seal layer 5-2 that forms the inner surface of the packaging bag contains a lubricant.

[0180] The laminated paper 5 shown in Figure 3(A) consists only of a paper base material 5-1, a heat-seal layer 5-2, and an intermediate layer 5-3. The heat-seal layer 5-2 forms the inner surface and faces the sanitary paper 3 shown in Figure 1, while the paper base material 5-1 forms the outer surface.

[0181] When using laminated paper 5 as the packaging bag 2 shown in Figure 1, the strength of the packaging bag 2 is improved and tearing of the packaging bag 2 can be suppressed compared to when using a packaging bag 2 made only of paper base material 5-1.

[0182] Furthermore, in the above case, since the heat-seal layer 5-2 shown in Figure 3 faces the sanitary paper 3, during packaging, the sanitary paper 3 comes into contact with the smooth surface of the heat-seal layer 5-2 and does not come into contact with the paper substrate 5-1. This prevents the sanitary paper 3 from getting caught on the packaging bag 2. Therefore, the packaging body 1 can maintain the packaging of the sanitary paper 3 well and is easy to package.

[0183] Furthermore, in the embodiment shown in Figure 3, since the heat-seal layer 5-2 contains a lubricant, even if the heat-seal layer 5-2 is strongly pressed against the sanitary paper (not shown) by external force from fingers or the like when opening the packaging bag, friction between the heat-seal layer 5-2 and the sanitary paper can be suppressed, and the laminate paper 5 moves easily on the sanitary paper. Therefore, the opening of the packaging is easy.

[0184] Furthermore, in the embodiment shown in Figure 3, since the intermediate layer 5-3 does not contain a lubricant, good adhesion between the paper substrate 5-1 and the intermediate layer 5-3 can be maintained. Although there is a possibility that some of the lubricant in the heat seal layer 5-2 may migrate to the intermediate layer 5-3, since the intermediate layer 5-3 does not contain a lubricant, the influence of the lubricant in the heat seal layer 5-2 on the adhesion between the paper substrate 5-1 and the intermediate layer 5-3 is reduced. Therefore, in the embodiment shown in Figure 3, even if some of the lubricant in the heat seal layer 5-2 migrates to the intermediate layer 5-3, the decrease in adhesion between the paper substrate 5-1 and the intermediate layer 5-3 due to the lubricant can be suppressed, and good bonding between the intermediate layer 5-3 and the heat seal layer 5-2 to the paper substrate 5-1 can be maintained.

[0185] Furthermore, in the embodiment shown in Figure 3(B), a transparent anti-slip layer 6 made of a varnish-hardened layer is formed on the surface of the paper substrate 5-1 opposite to the surface that the intermediate layer 5-3 contacts, and as shown in Figure 4, the anti-slip layer 6 is installed on both sides of the perforation 2-1. Therefore, when the laminated paper 5 shown in Figure 3(B) is used in the packaging bag 2 shown in Figure 4, when gripping the anti-slip layer 6 of the packaging bag 2 with fingers or the like and spreading both sides of the perforation 2-1 to cut the perforation 2-1 and open the bag, it becomes possible to make the gripping area of ​​the packaging bag 2 less slippery, making the opening process even easier.

[0186] In the embodiment shown in Figure 3(B), the anti-slip layer 6 is directly formed on the surface of the paper substrate 5-1. However, other layers, such as a protective layer or a printed layer, may be present between the paper substrate 5-1 and the anti-slip layer 6, as needed. Furthermore, these other layers are not limited to the space between the paper substrate 5-1 and the anti-slip layer 6, but may be present at any position on the surface of the paper substrate 5-1.

[0187] In the packaging 1 (see Figure 1 or Figure 4) using laminated paper as shown in Figure 2 or Figure 3, the density of the thermoplastic resin forming the heat seal layer 5-2 of the laminated paper 5 constituting the packaging bag 2 is relatively high, and the heat seal layer 5-2 is relatively resistant to stretching. Therefore, it is possible to open the packaging by cutting the perforations 2-1 with fewer movements. Furthermore, when opening the packaging bag 2 by cutting the perforations 2-1, the heat seal layer 5-2 is easily torn open in one wide area, and for this reason, the perforations 2-1 are easily opened in one wide area. Thus, with the above packaging 1, the opening of the packaging bag 2 can be easily performed.

[0188] Furthermore, in the above-mentioned packaging 1, the heat-seal layer 5-2 has relatively high resistance to stretching, which provides a crisp opening sensation and excellent usability. Moreover, the opening of the packaging bag 2 can be opened wide in one go, further improving the usability.

[0189] Furthermore, in the packaging 1 (see Figure 1 or Figure 4) using the laminated paper shown in Figure 3, which includes an intermediate layer 5-3, the density of the thermoplastic resin forming the intermediate layer 5-3 is lower than the density of the thermoplastic resin forming the heat-seal layer 5-2, and the density of the intermediate layer 5-3 is higher than that of the heat-seal layer 5-2, thus improving the integrity between the paper substrate 5-1 and the heat-seal layer 5-2. Moreover, because the density of the thermoplastic resin forming the intermediate layer 5-3 is moderate, the laminated paper 5 can maintain its overall resistance to stretching even with the presence of the intermediate layer 5-3. Therefore, the laminated paper 5 can be opened with relatively few movements, and when the laminated paper 5 is torn, it tends to tear widely at once, and for that reason, the perforations 2-1 tend to be opened widely at once. Consequently, even with the above-mentioned packaging 1, the opening of the packaging bag 2 can be easily performed.

[0190] Furthermore, when using the intermediate layer 5-3, as described above, the integration between the paper substrate 5-1 and the heat-seal layer 5-2 is improved, while the laminate paper 5 maintains its overall resistance to stretching, resulting in a crisp opening feel and superior usability. Moreover, the opening of the packaging bag 2 can be opened wide in one go, further improving usability. [Industrial applicability]

[0191] The packaging material of the present invention can be used for packaging sanitary paper, and is particularly suitable for packaging dry sanitary paper such as paper towels.

[0192] The packaging of the present invention can be manufactured by any of the following packaging methods: pillow packaging, gusset packaging, caramel packaging, etc. Therefore, the packaging of the present invention can take any of the forms of pillow packaging, gusset packaging, or caramel packaging. The packaging of the present invention is preferably pillow packaging. [Examples]

[0193] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these.

[0194] Density: Measured in accordance with JIS K 7112 Hardness (Durometer D): Measured in accordance with JIS K 7215.

[0195] [Production of packaging]

[0196] (Example 1) As a paper base material, crepe paper (basis weight 35 g / m²) 2 Using two extruders, laminated paper was produced by co-extrusion lamination, forming an intermediate layer and a heat-seal layer on a paper substrate in that order. The intermediate layer is Novatec® LD HC170 (density 0.936 g / cm³) manufactured by Nippon Polyethylene Co., Ltd. 3 It was formed using a material with a hardness of 60. The thickness of the intermediate layer was 12.5 μm. The heat-seal layer is made of Novatec® HD HS471 (density 0.956 g / cm³), a high-density polyethylene manufactured by Nippon Polyethylene Co., Ltd. 3The resin was formed using a resin composition containing a lubricant (erucic acid amide) with a hardness of 69). The concentration of the lubricant in the resin composition was 0.4% by weight relative to the total weight of the resin composition. The thickness of the heat seal layer was 12.5 μm. Using the laminated paper mentioned above, 200 sheets of paper towels folded in a pop-up fashion were pillow-packaged to produce a sanitary paper product. The center seal temperature was 210°C and the end seal temperature was 260°C. Furthermore, before pillow packaging, the laminated paper was processed so that a straight perforation was formed in the center of the surface of the pillow packaging, and varnish was applied symmetrically and partially on both sides of the perforation to form an anti-slip layer.

[0197] (Example 2) As a paper base material, crepe paper (basis weight 35 g / m²) 2 Using two extruders, laminated paper was produced by co-extrusion lamination, forming an intermediate layer and a heat-seal layer on a paper substrate in that order. The intermediate layer is Novatec® LD HC170 (density 0.936 g / cm³) manufactured by Nippon Polyethylene Co., Ltd. 3 It was formed using a material with a hardness of 60. The thickness of the intermediate layer was 12.5 μm. The heat-seal layer is made of Novatec® HD HS471 (density 0.956 g / cm³), a high-density polyethylene manufactured by Nippon Polyethylene Co., Ltd. 3 The resin was formed using a resin composition containing a lubricant (erucic acid amide) with a hardness of 69). The concentration of the lubricant in the resin composition was 0.6% by weight relative to the total weight of the resin composition. The thickness of the heat seal layer was 12.5 μm. Using the laminated paper mentioned above, 200 sheets of paper towels folded in a pop-up fashion were pillow-packaged to produce a sanitary paper product. The center seal temperature was 210°C and the end seal temperature was 260°C. Furthermore, before pillow packaging, the laminated paper was processed so that a straight perforation was formed in the center of the surface of the pillow packaging, and varnish was applied symmetrically and partially on both sides of the perforation to form an anti-slip layer.

[0198] (Example 3) As a paper base material, crepe paper (basis weight 35 g / m²) 2 Using two extruders, laminated paper was produced by co-extrusion lamination, forming an intermediate layer and a heat-seal layer on a paper substrate in that order. The intermediate layer is Novatec® LD HC170 (density 0.936 g / cm³) manufactured by Nippon Polyethylene Co., Ltd. 3 It was formed using a material with a hardness of 60. The thickness of the intermediate layer was 10.0 μm. The heat-seal layer is made of Novatec® HD HS471 (density 0.956 g / cm³), a high-density polyethylene manufactured by Nippon Polyethylene Co., Ltd. 3 The resin was formed using a resin composition containing a lubricant (erucic acid amide) with a hardness of 69). The concentration of the lubricant in the resin composition was 0.6% by weight relative to the total weight of the resin composition. The thickness of the heat seal layer was 10.0 μm. Using the laminated paper mentioned above, 200 sheets of paper towels folded in a pop-up fashion were pillow-packaged to produce a sanitary paper product. The center seal temperature was 210°C and the end seal temperature was 260°C. Furthermore, before pillow packaging, the laminated paper was processed so that a straight perforation was formed in the center of the surface of the pillow packaging, and varnish was applied symmetrically and partially on both sides of the perforation to form an anti-slip layer.

[0199] (Comparative Example 1) As a paper base material, crepe paper (basis weight 35 g / m²) 2 Using a single extruder, laminated paper was produced by forming a heat-sealed layer on a paper substrate through extrusion lamination. The heat-seal layer is made of Harmolex® NH845N (density 0.913 g / cm³), a low-density polyethylene manufactured by Nippon Polyethylene Co., Ltd. 3 The resin was formed using a resin composition containing a lubricant (erucic acid amide) with a hardness of 46. The concentration of the lubricant in the resin composition was 0.4% by weight relative to the total weight of the resin composition. The thickness of the heat seal layer was 25 μm. Using the laminated paper mentioned above, 200 sheets of paper towels folded in a pop-up fashion were pillow-packaged to produce a sanitary paper product. The center seal temperature was 210°C and the end seal temperature was 260°C. Furthermore, before pillow packaging, the laminated paper was processed so that a straight perforation was formed in the center of the surface of the pillow packaging, and varnish was applied symmetrically and partially on both sides of the perforation to form an anti-slip layer.

[0200] [Packaging evaluation]

[0201] (Slip angle) Using the laminated paper prepared in Examples 1-3 and Comparative Example 1, the slip angle was measured in accordance with the "inclination method" of JIS P8147:2010. As measuring instruments, we used the Model TMC-S-60 inclined static friction coefficient measuring instrument (slip tester) and the Model TMC-B-60 slip tester controller, both manufactured by TMC Corporation Japan. Specifically, the laminated paper was placed on the horizontal table of the measuring instrument with the heat-sealed layer facing upwards. A paper towel was then placed on the heat-sealed layer of the laminated paper, and the incline was increased at a speed of 1.5° / second. The angle of incline at which the paper towel began to slide was defined as the sliding angle. Furthermore, the flow direction of the paper substrate of the laminated paper was set to be perpendicular to the direction in which the paper towel slides, and the flow direction of the paper towel was set to be parallel to the direction in which the paper towel slides.

[0202] (Ease of opening 1) The ease of opening the perforations was evaluated as follows using the pillow packaging from Examples 1-3 and Comparative Example 1. For Examples 1-3 and Comparative Example 1, the length of the opened perforation was measured when the thumbs of both hands were placed on either side of the perforation of the pillow packaging, and the thumbs were spread to the left and right to open the perforation to a position 2 cm on both sides of the perforation. The measurement was performed three times, and the average length of the opened perforation was used as the result for (Ease of Opening 1). Note that even if the paper layer was torn, the portion where the heat-seal layer (resin layer) was not torn was considered unopened. The results are shown in Table 1 below.

[0203] (Ease of opening 2) The ease of opening the perforations was further evaluated using the pillow packaging from Examples 1-3 and Comparative Example 1 as follows. A 200mm x 25mm test specimen was cut from the perforated surface of the pillow packaging. The perforations were oriented parallel to the 25mm edge and positioned in the center of the specimen. The test specimen was placed between the chucks of a tensile testing machine (TENSILON RTG-1210, manufactured by A&D Co., Ltd.). Specifically, the distance between the chucks was set to 50 mm, and the specimen was positioned so that the perforations were centered between the chucks. The test specimen was pulled at a tensile speed of 200 mm / min, and the distance traveled until the tensile load was maximum and the distance traveled until the tensile load fell below 0.5 N were measured. The former distance traveled corresponds to the distance traveled until the paper layer ruptured. The latter distance traveled corresponds to the distance traveled until the heat-seal layer (resin layer) ruptured. The results are shown in Table 1 below. In Table 1, "paper layer (mm)" and "resin layer (mm)" refer to the distance traveled at which the tensile load is maximum (paper layer fracture distance) and the distance traveled until the tensile load becomes less than 0.5 N (resin layer fracture distance), respectively.

[0204] (The feeling of opening the package) The ease of opening the perforations was evaluated as follows using the pillow packaging from Examples 1-3 and Comparative Example 1. ○: You can get a crisp feeling when opening the package. ×: Does not provide a crisp, crunchy feeling when opened. The results are shown in Table 1 below.

[0205] [Table 1]

[0206] The laminated paper produced in Examples 1 to 3 has a greater sliding angle than the laminated paper produced in Comparative Example 1. Therefore, the laminated paper produced in Examples 1 to 3 has greater friction with the sanitary paper than the laminated paper produced in Comparative Example 1, and for that reason, it is less likely to slide on the sanitary paper. However, on the other hand, the laminated paper produced in Examples 1 to 3 has perforations that can be opened more widely in one go, and the distance required to open it is shorter than that of the laminated paper produced in Comparative Example 1.

[0207] In other words, as is clear from the results for "Ease of Opening 1" in Table 1, the distance of the perforations that can be opened at once is longer in Examples 1 to 3 than in Comparative Example 1, demonstrating the superior ease of opening of the pillow packaging in Examples 1 to 3.

[0208] Furthermore, as is clear from the results for "Ease of Opening 2" in Table 1, the distance traveled by the paper layer and heat-sealed layer (resin layer) until the perforations are opened is shorter in Examples 1 to 3 than in Comparative Example 1, and there is no need to move fingers or hands significantly for opening, thus demonstrating the superior openability of the pillow packaging in Examples 1 to 3.

[0209] Furthermore, as is clear from the "opening sensation" results in Table 1, Examples 1-3 provide a crisper opening sensation compared to Comparative Example 1, demonstrating the superior usability of the pillow packaging in Examples 1-3. [Explanation of Symbols]

[0210] 1 package 2 packaging bag 3. Sanitary paper 4 air vents 5. Laminating paper 5-1 Paper base material 5-2 Heat seal layer 5-3 Middle Class 6 Anti-slip layer

Claims

1. Sanitary paper, and, Packaging bag for containing the aforementioned sanitary paper A packaging body equipped with, The aforementioned packaging bag is made of laminated paper having a paper base material and a heat-seal layer. The laminated paper has an opening, The heat-seal layer forms the inner surface of the packaging bag, and the density is 0.942 g / cm³. ３ A packaging body made of a high-density thermoplastic resin having the above density.

2. The packaging according to claim 1, wherein the opening portion has perforations.

3. The aforementioned paper substrate is 10 g / m² ２ ~90g / m ２ The packaging according to claim 1, having the basis weight.

4. The packaging according to claim 1, wherein the paper substrate is crepe paper.

5. The packaging according to claim 1, wherein the thickness of the heat-seal layer is 10 μm to 30 μm.

6. The packaging according to claim 1, wherein the hardness of the high-density thermoplastic resin, as measured in accordance with JIS K 7215, is 50 or higher.

7. The packaging according to claim 1, wherein the high-density thermoplastic resin is a polyolefin.

8. The packaging according to claim 1, wherein the heat-seal layer contains a lubricant.

9. The packaging according to claim 1, wherein the heat-seal layer is an extruded coating layer.

10. The laminate paper further comprises an intermediate layer between the paper substrate and the heat-seal layer, The aforementioned intermediate layer is 0.925 to 0.940 g / cm³ ３ The packaging according to claim 1, comprising a medium-density thermoplastic resin having a density of .

11. The packaging according to claim 10, wherein the medium-density thermoplastic resin has a hardness of 45 or higher as measured in accordance with JIS K 7215.

12. The packaging according to claim 10, wherein the medium-density thermoplastic resin is a polyolefin.

13. The packaging according to claim 10, wherein the intermediate layer is an extruded coating layer.

14. The packaging according to claim 10, wherein the intermediate layer is adjacent to the paper substrate and the heat seal layer.

15. The packaging body according to claim 1, wherein the paper substrate forms the outer surface of the packaging bag.

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