Roll product package

Abstract

To provide a roll product package that maintains compactness even when packaging long roll products in one ply, prevents ink from peeling off at the printed portion of the film, has heat-sealing properties, maintains strength, and has excellent loading efficiency and transportability.SOLUTION: There is provided a roll product package containing a plurality of roll products in a packaging bag made of a film. The roll products each have a winding softness of 1.0 mm or more and 5.0 mm or less, a winding diameter of 95 mm or more and 168 mm or less, a roll weight of 219 g or more and 388 g or less, and a roll density of 0.14 g / cm3 or more and 0.42 g / cm3 or less. The film includes a base layer, a printed portion and a varnish coating layer, the printed portion and the varnish coating layer being provided on a surface opposite to a surface in contact with outside air. The film has a thickness of 18 μm / 1 ply or more and 50 μm / 1 ply or less, and the amount of varnish applied is 1.5 g / m2 or more and 2.4 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roll product package in which a roll product is packaged in a film. [Background technology]

[0002] Toilet paper is generally sold in packages of 4 rolls or 12 rolls.

[0003] Because these packages are bulky, the amount that can be carried when purchasing is limited, and the amount that can be purchased at one time is naturally limited. In addition, storage space is limited at home, at work, in public facilities, and the like. For these reasons, toilet rolls have been developed that have a reduced basis weight per sheet and a longer roll length (i.e., longer).

[0004] In addition, the product name and pictures and patterns to improve design are printed with ink on the packaging film that wraps the toilet rolls. This printing is done on the inner surface of the packaging bag, i.e., the side of the packaging film that comes into contact with the toilet roll, to prevent the ink from coming off due to rubbing against the outer surface of the product that occurs during shipping, delivery, and when the product is carried after purchase.

[0005] As a prior art document of an invention related to a long toilet roll, for example, Patent Document 1 describes a roll-shaped toilet paper made by winding up a laminate of multiple overlapping webs into a roll, and the basis weight per web is 8 to 13 g / m. 2 The basis weight of the laminate obtained by overlapping the webs is 15 to 30 g / m 2 The laminate is wound into a roll having a wound length of 60 to 100 m and a diameter of 100 to 115 mm.

[0006] Patent Document 2 also describes a toilet paper roll in which two plies of long toilet paper are wound into a roll shape, and the basis weight of the sheet constituting each ply is 10 to 14 g / m 2 The difference in elongation rate of each sheet in the longitudinal direction is 2 to 10%, each sheet is integrated by a contact embossment formed on the edge of the width direction of the toilet paper, the diameter is 100 to 120 mm, and the winding length is 60 to 90 m.

[0007] Furthermore, as a prior art document of an invention relating to a toilet roll package in which printing is applied to a film, Patent Document 3 describes a toilet roll package in which a plurality of toilet rolls are packaged in a packaging film, in which the toilet rolls contain a fragrance, and the packaging film has an oxygen permeability of 40 cc / m 2 The toilet roll packaging disclosed herein is characterized in that the inner surface of the film substrate that comes into contact with the toilet roll is printed, and the printed portion is covered with a vinyl chloride resin layer. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2006-087703 A [Patent Document 2] JP 2013-208297 A [Patent Document 3] JP 2015-171907 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, when the toilet roll and the film rub against each other, there is a risk that the ink will adhere to the toilet roll. Furthermore, as the toilet roll becomes longer, the roll becomes less soft (the roll becomes harder) and the roll weight increases, which makes it more likely to be rubbed with stronger force and causes the ink to peel off. In particular, single (1-ply) long toilet rolls have a greater roll weight than double (2-ply) long toilet rolls, so there was a problem that the ink was more likely to peel off.

[0010] To prevent this, it was found that if a film with a varnish coating was used on the ink-printed portion, the ink would not peel off easily, even if the toilet roll inside was a long, single-ply roll. However, applying varnish on the ink-printed portion reduced the heat-sealing properties, making it difficult to maintain the heat-sealing properties while preventing the ink from peeling off. Furthermore, when toilet roll packaging bags (hereinafter referred to as roll product packages or simply packages) are transported from factories to retailers, multiple packaging bags are packed and loaded into cardboard boxes. However, if the boxes are packed too tightly, the packaging bags rub against each other and the ink is likely to peel off, resulting in poor loading efficiency and ease of transport.

[0011] The present invention has been made in consideration of the above circumstances, and has an object to provide a roll product package that maintains compactness even when a long roll product is packaged in one ply, prevents the ink from peeling off in the printed areas of the film, has heat sealability and maintains strength, and further has excellent loading efficiency and transportability. [Means for solving the problem]

[0012] The inventors of the present invention have conducted intensive research in view of the above-mentioned problems. As a result, they have found that in a roll product package in which a plurality of roll products each having one ply of sanitary thin paper wrapped around it are stored in a packaging bag made of a film, by specifying the winding softness, winding diameter, roll weight, and roll density of the roll product, and further by providing a printed part and a varnish coating layer on the surface opposite to the surface in contact with the outside air, the thickness of the film and the amount of varnish coating are specified, so that even if a long roll product is packaged with one ply, compactness is maintained, the ink in the printed part of the film is not easily peeled off, the film has heat sealability, and strength is maintained, and furthermore, a roll product package having excellent loading efficiency and transportability can be obtained, thereby solving the above-mentioned problems, and have completed the present invention. Specifically, the present invention provides the following:

[0013] (1) A first aspect of the present invention is a roll product package comprising a plurality of roll products, each of which is a one-ply sheet of sanitary thin paper wrapped in a packaging bag made of a film, the roll products having a roll softness of 1.0 mm or more and 5.0 mm or less, a roll diameter of 95 mm or more and 168 mm or less, a roll weight (excluding the core) of 219 g or more and 388 g or less, and a roll density of 0.14 g / cm. 3 More than 0.42g / cm 3 the film includes a base layer, a printed portion, and a varnished layer, the printed portion and the varnished layer are on the surface opposite to the surface in contact with the outside air, the thickness of the film is 18 μm / ply or more and 50 μm / ply or less, and the amount of varnish applied is 1.5 g / m 2 More than 2.4g / m 2 1. A roll goods package comprising:

[0014] (2) A second aspect of the present invention is the roll product package described in (1), wherein the number of roll products stored is 4, 6, 8 or 12, the roll products are packed in the packaging bag in two rows, each row consisting of two roll products arranged in one or two rows, with the axial direction vertical, and the packaging bag is a cylindrical gusseted bag having a roughly rectangular main body that surrounds the roll products, and handle portions that extend upward from the opposing long sides of the upper side of the main body in a gable roof shape and are joined, and finger holes are formed in the handle portions.

[0015] (3) A third aspect of the present invention is a roll product package as described in (1), characterized in that when the package is packed into a cardboard box, two packages are stacked vertically in two layers.

[0016] (4) A fourth aspect of the present invention is the roll product package according to (1), characterized in that the varnish contains at least a resin and an auxiliary.

[0017] (5) A fifth aspect of the present invention is the roll product package described in (4), characterized in that the resin components contained in the varnish are polyamide resin in an amount of 50% by weight or more.

[0018] (6) A sixth aspect of the present invention is the roll product package according to (1), characterized in that the film is corona treated.

[0019] (7) A seventh aspect of the present invention is the roll product package according to (1), characterized in that the film is not corona treated.

[0020] (8) An eighth aspect of the present invention is the roll product package according to (1), characterized in that the printed portion is disposed on a panel portion of the packaging bag. Effect of the Invention

[0021] According to the present invention, a roll product package can be provided which maintains compactness even when a long roll product is packaged in one ply, makes it difficult for the ink to peel off in the printed portion of the film, has heat sealability, maintains strength, and further has excellent loading efficiency and transportability. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view illustrating an example of a roll product package according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing an apparatus for measuring the winding softness of a roll product according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the form for carrying out the present invention (hereinafter, the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0024] <Roll product package> Fig. 1 is a perspective view showing an example of a roll product package according to an embodiment of the present invention. As shown in Fig. 1, a plurality of roll products 2, each of which is wrapped with one ply of sanitary thin paper, are stored in a packaging bag 10 made of a film 16. The number of roll products 2 stored and the packaging form will be described later.

[0025] (film) The film 16 has a printed portion 19 on a plastic substrate, and varnish is applied thereon. That is, the film 16 includes a substrate layer (hereinafter also simply referred to as substrate), a printed portion 19, and a varnished layer. By making the film 16 include the substrate layer, the printed portion 19, and the varnished layer, it is possible to prevent ink from falling off in the printed portion 19, which will be described later, but in exchange, the heat sealability is deteriorated. This is thought to be due to the fact that the film 16 has a varnished layer, which makes it thick. Therefore, while reducing the thickness of the film 16, which will be described later, the paper quality of the roll product 2 and the composition of the film 16 are adjusted so that the film 16 is not too thin and easily torn during heat sealing.

[0026] The material of the base material of the film 16 is preferably a thermoplastic resin (so-called plastic) suitable for recycling. Specific examples include conventionally known thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyester (PET, etc.), polyamide (nylon, etc.), polycarbonate, polystyrene, polyvinyl chloride, etc. Among these, polyethylene and polypropylene are preferable, and polyethylene is more preferable in terms of stretchability and strength, and linear low density polyethylene (LLPDE) is particularly preferable.

[0027] The amount of varnish applied to the film 16 is 1.5 g / m 2 More than 2.4g / m 2 Less than or equal to 1.6 g / m 2 More than 2.2g / m 2 Preferably, it is 1.7 g / m or less. 2 More than 2.1g / m 2 It is more preferable that the coating weight of the varnish is 1.5 g / m or less. 2 If the amount of varnish applied is less than 2.4 g / m, the ink in the printed portion 19 is likely to peel off. 2 If it exceeds this value, the film 16 becomes too thick and the heat sealability becomes poor. The amount of varnish applied is calculated from the basis weight of the film 16 and the basis weight of the substrate measured before applying the varnish according to the following formula. Note that "basis weight of the substrate measured before applying the varnish" includes only the substrate and the printed portion 19, and does not include the varnish coating layer. Amount of varnish applied = basis weight of film 16 - basis weight of substrate before varnish application The basis weight of the film 16 and the basis weight of the substrate before the varnish is applied are both measured in accordance with JIS P 8124.

[0028] The varnish to form the varnish coating layer is applied so as to cover the printed portion 19 (the printed portion 19 is completely covered by the varnish coating layer). The varnish may be applied narrower than the printed portion 19 (the printed portion 19 may be exposed), but it is preferable to apply the varnish wider than the printed portion 19. The varnish may also be applied to the entire area including areas other than the printed portion 19. In particular, it is more preferable to apply the varnish to the printed portion 19 of the panel portion 13 of the packaging bag 10. The amount of varnish applied is considered to be the amount applied per unit of one roll product package. For example, if the area of ​​the printed part 19 is 50% of the area of ​​the film 16, and 1 g / m2 of varnish is applied only to the upper part of the printed part 19, 2 When applied, the amount of application is 1g / m 2 0.5g / m 2 That is, the amount of application is defined as follows: if the area of ​​the printed portion 19 is 50% of the entire packaging bag 10, the amount of application is 100% of the printed portion 19. Depending on the manufacturing conditions, the amount of application may deviate from 100% of the printed portion 19 by about ±30%. The area of ​​the printed portion 19 is preferably 20% to 95%, more preferably 30% to 90%, and even more preferably 40% to 85% of the area of ​​the film 16. In the case of a gable roof-type gusset package as shown in Fig. 1, for example, the area of ​​the film 16 is the area excluding the bottom surface (the area below the heat seal including the heat seal portion) and the top surface (the area above the handle including the handle portion).

[0029] The varnish preferably contains at least a resin and an auxiliary, and preferably contains 50% by weight or more of polyamide resin among the resin components contained in the varnish, which makes it possible to prevent the ink in the printed portion 19 from peeling off even if the film 16 and the roll product 2 are rubbed against each other. As for the auxiliary, additives such as antistatic agents and antioxidants that are usually contained in varnishes and coating agents can be used without any particular restrictions.

[0030] The basis weight of the film 16 is 16.2 g / m 2 More than 42.7g / m 2 Preferably, it is 19.1 g / m or less. 2 More than 33.2g / m 2 More preferably, it is 22.3 g / m or less. 2 More than 29.2g / m 2 It is more preferable that the basis weight is 16.2 g / m or less. 2 If the basis weight is less than 42.7 g / m, the strength of the film 16 is too low and it is easily torn. 2 If it exceeds this value, the strength of the film 16 will be too high and the heat sealability will be poor. By having the basis weight of the film 16 within the above numerical range, it is possible to obtain a packaging bag 10 and a roll product package 1 that are excellent in heat sealability and difficult to tear.

[0031] The thickness of the film 16 is 18 μm / ply or more and 50 μm / ply or less, preferably 24 μm / ply or more and 36 μm / ply or less, and more preferably 26 μm / ply or more and 33 μm / ply or less. If the thickness is less than 18 μm / ply, the film 16 is too thin and easily breaks when heat sealed. If the thickness exceeds 50 μm / ply, the film 16 is too thick and has poor heat sealing properties. In addition, the roll product 2 and the printed part 19 rub against each other, and the ink is easily peeled off. By setting the thickness of the film 16 within the above range, a packaging bag 10 and a roll product package 1 that have excellent heat sealing properties and from which the ink is not easily peeled off can be obtained. The thickness of the film 16 can be measured in accordance with JIS K7130.

[0032] Furthermore, the film 16 has a printed portion 19 (and a varnish coating layer) on the inner surface of the packaging bag 10, i.e., the surface opposite to the surface in contact with the outside air, in order to prevent the ink from falling off due to rubbing of the outer surface that occurs during shipping, delivery, carrying the product after purchase, etc. The details of the printed portion 19 will be described later. The film 16 may have other layers in addition to the substrate, the varnish coating layer, and the printed portion 19. Examples of the other layers include a heat seal layer, a water vapor barrier layer, an oxygen barrier layer, a printability improving layer, an overprint layer, and a light shielding layer. These other layers may be provided, for example, on the front or back side of the substrate, and may be one layer or two or more layers. The film 16 may be corona-treated to improve the printing characteristics, but this is not essential. Corona treatment can prevent the ink from peeling off the film 16, but not corona-treating the film 16 improves the heat-sealing properties of the film 16, eliminates the need to apply excessive heat during heat-sealing, and reduces tearing in the heat-sealed areas.

[0033] (Roll products) The roll product package 1 of the present invention packages a plurality of roll products 2. The number of roll products 2 stored is preferably 4, 6, 8 or 12, and the roll products 2 are preferably packaged in a packaging bag 10 in two rows, each row consisting of two roll products 2 arranged vertically in the axial direction. For example, as shown in Fig. 1, four roll products 2 are packaged in a packaging bag 10 in two rows, each row consisting of two roll products 2 arranged vertically. The roll product 2 is not particularly limited as long as it is a rolled up one-ply sheet of sanitary thin paper, but is preferably a toilet roll.

[0034] The winding flexibility of the roll product 2 is 1.0 mm or more and 5.0 mm or less, preferably 1.5 mm or more and 4.0 mm or less, and more preferably 1.8 mm or more and 3.0 mm or less. If the winding flexibility is less than 1.0 mm, the roll product 2 becomes hard and rubs against the film 16, making the ink more likely to peel off. If the winding flexibility exceeds 5.0 mm, the roll product 2 becomes too soft and easily loses its shape inside the packaging bag 10, resulting in poor loading efficiency and transportability.

[0035] The winding softness is measured using a measuring device 20 shown in Fig. 2, and can be defined as the amount of deformation of the roll product 2 when a load is applied to the roll product 2. The measuring device 20 includes a base plate 21, a support plate 22, a roll insertion hole 23, a movable weight mounting plate 24, and a 625g weight 25. The base plate 21 is 127mm long, 530mm wide, and 15mm thick, and the support plates 22 are 151mm long, 100mm wide, and 8mm thick, 40mm wide, 120mm long, and 8mm thick, and 40mm wide, 184mm long, and 5mm thick, respectively, and are fixed to the base plate 21 with bolts and stand up vertically.

[0036] The movable weight placement plate 24 is attached to the support plate 22 by a hinge, and can be opened and closed. The movable weight placement plate 24 is a combination of a rectangle 79 mm long and 130 mm wide, a hexagon with each corner of a rectangle 97 mm wide and 120 mm long cut to about 26.5 mm, and a trapezoid with a base of 85 mm, an upper side of 39 mm, and a height of 170 mm. It is made of plastic and has a thickness of 3 mm and a weight of 142 g. A 150 mm ruler is fixed to the tip (the tip of the trapezoid). The position where the weight 25 is placed is the center of the hexagon. A magnet is fixed to the support plate 22, and a 150 mm ruler can be attached to the magnet. The deformation amount of the roll product 2 can be measured by reading the intersection of the magnet and the 150 mm ruler attached to the tip of the movable weight placement plate 24. A roll insertion hole 23 with a diameter of 30 mm and a height of 120 mm is fixed vertically to the support plate 22, and when measuring, a movable weight mounting plate 24 is placed on the roll product 2 inserted into the roll insertion hole 23. The height of the movable weight mounting plate 24 in this state is defined as an initial height H1. Furthermore, when a weight 25 is placed on the movable weight mounting plate 24, the weight of the weight 25 causes the movable weight mounting plate 24 to deform the roll product 2 and sink, so the height at this time is measured and defined as height H2, and the amount of deformation (height H2 - height H1) is found as the winding softness of the roll product 2.

[0037] The winding length of the roll product 2 is preferably 145 m or more and 175 m or less, more preferably 150 m or more and 170 m or less, and even more preferably 155 m or more and 165 m or less. If the winding length is less than 145 m, the roll product 2 is not long and cannot be replaced frequently. If the winding length exceeds 175 m, the winding diameter becomes large, which rubs against the printed part 19 and makes the ink easily peel off.

[0038] The winding diameter of the roll product 2 is 95 mm or more and 168 mm or less, preferably 105 mm or more and 145 mm or less, and more preferably 112 mm or more and 127 mm or less. If the winding diameter is less than 95 mm, the winding length becomes short, and the roll product 2 is not long, so that the frequency of replacement is low. If the winding diameter exceeds 168 mm, the roll density decreases when the winding length is kept constant, and as a result, the roll product 2 and the film 16 are easily rubbed against each other, and the ink is easily peeled off. By setting the winding length and winding diameter of the roll product 2 within the above ranges, compactness is maintained and the ink on the printed portion 19 of the film 16 is less likely to peel off. As a result, a roll product package 1 with excellent loading efficiency and transportability can be obtained.

[0039] Furthermore, the weight per 114 mm of the roll width of the roll product 2 excluding the core is 219 g or more and 388 g or less, preferably 283 g or more and 345 g or less, and more preferably 285 g or more and 322 g or less. The weight per 114 mm of the roll width of the roll product 2 including the core is preferably 224 g or more and 393 g or less, more preferably 288 g or more and 350 g or less, and even more preferably 290 g or more and 327 g or less. If the weight excluding the core is less than 219 g or the weight including the core is less than 224 g, the roll density is low when the roll length is constant, and as a result, the thickness of the sheet is high, the roll diameter is large, and the compactness is poor. If the weight excluding the core exceeds 388 g or the weight including the core exceeds 393 g, the roll product package 1 becomes heavy, the film 16 becomes easily torn, and the roll product package 1 becomes poor in loading efficiency and transportability.

[0040] The roll width of the roll product 2 is preferably 108 mm to 120 mm, more preferably 110 mm to 118 mm, and even more preferably 112 mm to 116 mm. If the roll width is less than 108 mm, the size of the sheets becomes small, resulting in an increase in the number of sheets used and reduced replacement frequency. If the roll width exceeds 120 mm, the roll product 2 and the roll product package 1 become less compact.

[0041] In addition, the thickness of the 10 sheets (10 sheets for 10 sets since it is one ply) used in the roll product 2 is preferably 0.46 mm / 10 sheets or more and 1.20 mm / 10 sheets or less, more preferably 0.67 mm / 10 sheets or more and 0.96 mm / 10 sheets or less, and even more preferably 0.73 mm / 10 sheets or more and 0.89 mm / 10 sheets or less. If the thickness of the sheets is less than 0.46 mm / 10 sheets, the roll density will be low, and as a result, the thickness of the sheets will be high, and the roll diameter will be large and the compactness will be poor. If the thickness of the sheets exceeds 1.20 mm / 10 sheets, the roll weight will be heavy when a certain roll diameter is used, and as a result, the roll product 2 and the film 16 will be easily rubbed, and the ink will be easily peeled off or the film will be easily torn. The thickness of the paper is measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa, a gauge head diameter of 30 mm, a sample is placed between the gauge head and the measuring table, and the gauge is read when the gauge head is lowered at a speed of 1 mm per second or less. In addition, the thickness of a 100 mm thick sheet of 10 sheets (1 ply, so 10 sheets in 10 sets) is measured. 2 Prepare two bundles and measure each bundle at five equally spaced points for a total of 10 measurements, then average the results.

[0042] Furthermore, the basis weight per ply of the roll product 2 is 11 / m 2 More than 22g / m 2 It is preferable that the thickness is less than 13 g / m 2 More than 20g / m 2 More preferably, it is 15 g / m or less. 2 More than 18g / m 2 It is more preferable that the basis weight is 11 g / m or less. 2 If the basis weight is less than 22 g / m, the roll density will be low when wound to a certain length, resulting in a thicker sheet, a larger roll diameter, and poor compactness. 2 If it exceeds this value, the roll weight will become heavy, and as a result, the roll product 2 and the film 16 will be more likely to rub against each other, which will lead to ink peeling and film tearing.

[0043] The outer diameter of the core (cardboard tube) of the roll product 2 is preferably 34 mm to 46 mm, more preferably 36 mm to 43 mm, and even more preferably 38 mm to 41 mm. If the outer diameter of the core is less than 34 mm, when a constant winding diameter is achieved, the winding length becomes long and the roll weight becomes heavy, resulting in the roll product 2 and the film 16 being easily rubbed, and ink peeling and film tearing becoming more likely to occur. If the outer diameter of the core is more than 46 mm, when a constant winding diameter is achieved, the winding length becomes short and the roll product 2 is no longer long, resulting in poor replacement frequency.

[0044] The weight of the core (paper tube) of the roll product 2 is preferably 3.5 g to 6.0 g, more preferably 4.0 g to 5.3 g, and even more preferably 4.2 g to 4.9 g. If the weight of the core is less than 3.5 g, the roll density will be low when wound to a certain length, resulting in a high paper thickness of the sheet, a large winding diameter, and poor compactness. If the weight of the core exceeds 6.0 g, the roll weight will be heavy, and as a result, the roll product 2 and the film 16 will be easily rubbed, and the ink will peel off and the film will be easily torn. By setting the outer diameter, basis weight, and weight of the core of the roll product 2 within the above ranges, it is easy to adjust the roll weight to a predetermined value. In addition, the ink on the printed portion 19 of the film 16 is less likely to peel off, and a roll product package 1 with excellent loading efficiency and transportability can be obtained.

[0045] Furthermore, the roll density of the roll product 2 is 0.14 g / cm 3 More than 0.42g / cm 3 Less than or equal to 0.18 g / cm 3 More than 0.38g / cm 3 It is preferable that the density is 0.21 g / cm or less. 3 More than 0.34g / cm 3 It is more preferable that the roll density is 0.14 g / cm or less. 3If the roll density is less than 0.42 g / cm, the roll weight will be light when a constant winding diameter is used, resulting in problems such as a low sheet basis weight of the roll product 2 and a short winding length. 3 If the thickness exceeds this value, the roll weight will be heavy when a constant winding diameter is used, and as a result, the roll product 2 and the film 16 will be more likely to rub against each other, making the ink more likely to peel off and the film more likely to tear. By setting the roll density of the roll product 2 within the above range, it is easy to adjust the roll weight to a predetermined value. In addition, the ink on the printed portion 19 of the film 16 is less likely to peel off, and a roll product package 1 with excellent loading efficiency and transportability can be obtained.

[0046] The roll density is calculated by multiplying the base area of ​​one roll product 2 excluding the core by the roll width (height) (i.e., the volume of one roll product 2 excluding the core), and dividing the weight of one roll product 2 excluding the core by this volume. For example, if the roll weight (excluding the core) per 114 mm of roll width is 201 g, the roll diameter is 130 mm, and the outer diameter of the core is 39 mm, the roll density = 201 g ÷ [{3.14 × (130 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(114mm÷10)]=0.15g / cm 3 It becomes. At this time, the roll density is measured after maintaining the roll in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1° C., 50±2% RH).

[0047] The specific volume of roll product 2 is 3.2 cm 3 / g or more 7.4cm 3 / g or less, and 3 / g or more 6.8cm 3 / g or less is more preferable, and 3 / g or more 5.5cm 3 / g or less. 3If the specific volume is less than 7.4 cm3 / g, the roll weight becomes heavy, and as a result, the roll product 2 and the film 16 are easily rubbed against each other, which makes the ink peeling and the film tearing more likely to occur. 3 If the viscosity exceeds 1 / g, the roll density will be low when wound to a certain length, and as a result, the roll product 2 and the film 16 will be more likely to rub against each other, causing the ink to peel off. The specific volume of rolled product 2 is calculated by dividing the thickness of rolled product 2 by the basis weight, and expressing the volume per unit g cm 3 It is expressed as:

[0048] (packaging format) The packaging format of the roll product package 1 according to one embodiment of the present invention is preferably a gusset bag (gusset packaging). 1, the packaging bag 10 has a substantially rectangular parallelepiped main body 11 surrounding the roll product 2, and gripping portions 12 extending upward from opposing long sides of the upper side of the main body 11 in a gable roof shape and joined thereto, and a finger hole 15 is formed in the gripping portions 12. The packaging bag 10 will be described in detail below.

[0049] The packaging bag 10 integrally includes a bottomed cylindrical main body 11 that surrounds the rolled product 2, and a gripping portion 12 that extends continuously upward from the upper end of the main body 11. The gripping portion 12 extends upward from the mutually opposing upper sides 11a and 11c of the upper sides 11a to 11d of the main body 11, respectively, in a gabled roof shape and is joined thereto. Between the upper sides 11a and 11c of the main body 11 and the gripping portion 12, inclined gabled roof-shaped panel portions 13a and 13b are provided. At both ends in the width direction (Y direction) of the panel portions 13a and 13b, mountain folds 14 that become the end edges on the gable side are provided. The gripping portion 12 has a finger hole 15. In this embodiment, the gripping portion 12 has two finger holes 15. Although there may be one finger hole 15, since the thickness of the film 16 of the roll product package 1 of the present invention is thin, it is preferable that there are two finger holes 15 so that the finger hole 15 is less likely to tear. In addition to film 16, a reinforcing film 17 may be further bonded to the periphery of gripping portion 12 in order to reinforce gripping portion 12. The base material of reinforcing film 17 may be the same material as film 16, or may be a material with greater strength.

[0050] The film 16 of the packaging bag 10 is formed into a tube shape (cylindrical shape) before storing the roll product 2. Before storing the roll product 2, the film 16 of the packaging bag 10 is folded inward symmetrically and flatly, with both sides in the width direction of the body-side film 16 as gussets, to form folded edges. In addition, the upper end side of the body-side film 16 is integrated and fixed by heat sealing to form a rectangular flat portion that extends elongatedly in the width direction, and this flat portion functions as the gripping portion 12. In other words, the width direction (Y direction) of the packaging bag 10 is the longitudinal direction of the gripping portion 12.

[0051] When storing the roll product 2, the main body portion 11 of the main body side film 16 opens downward, and the roll product 2 is stored from below. After the roll product 2 is stored in the main body portion 11 of the main body side film 16 from below, the lower open end of the main body portion 11 is heat sealed to form a sealing portion 18. The gusset of the main body portion 11 of the main body side film 16 unfolds when the roll product 2 is stored, and the main body portion 11 forms a substantially rectangular parallelepiped with a rectangular cross section having four side faces, and covers the roll product 2. Note that when storing the roll product 2 in the packaging bag 10, after forming the sealing portion 18, the lower end portion of the packaging bag 10 can be appropriately cut as necessary to adjust the dimensions.

[0052] Moreover, the printed portion 19 is preferably disposed on the panel portion 13 (the top surface portion of the packaging bag 10) from the viewpoints of visibility and ease of rubbing against the roll product 2. The printed portion 19 is formed by printing on a base material with ink and then applying varnish, as described above. The information printed by the printing unit 19 is not particularly limited as long as it is information that needs to be presented to the customer, such as the product name, logo, features, composition, and warnings.

[0053] (Packing and transportation methods) A plurality of roll product packages 1 of the present invention are packed in a cardboard box for transportation. When packing the packages in the cardboard box, preferably two packages are stacked in two layers in the height direction, thereby making it possible to obtain a roll product package 1 that is excellent in loading efficiency and transportability while suppressing peeling of the ink. The number of packages in one layer of the cardboard box is not particularly limited, but is preferably 4 packs to 20 packs, more preferably 8 packs to 16 packs, and even more preferably 10 packs to 14 packs.

[0054] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0055] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below.

[0056] Toilet roll products, wrapping films, and roll product packages of Examples 1 to 18 and Comparative Examples 1 to 8 were produced and packed in cardboard boxes under the conditions shown in Tables 1 and 2. In addition, the toilet roll products, wrapping films, and roll product packages of each Example and Comparative Example were evaluated as follows.

[0057] (Film ink peeling) The roll product package was shaken 100 times up and down and left and right, and then the packaging film was opened and the ink peeling from the printed area was evaluated by 30 monitors. The evaluation criteria were as follows: ◎: More than 28 people felt that the ink did not peel off or transfer onto the sheet. Good: Between 25 and 27 people felt that the ink did not peel off or transfer to the sheet. △: 21 to 24 people felt that the ink did not peel off or transfer to the sheet. ×: Fewer than 20 people felt that the ink did not peel off or transfer to the sheet

[0058] (Film heat sealability) The heat-sealed portion of the roll product package was broken, and the heat-sealing property was evaluated by 30 monitors. The evaluation criteria were as follows: ◎: More than 28 people felt that the heat seal strength was sufficient Good: 25 to 27 people felt that the heat seal strength was sufficient △: 21 to 24 people felt that the heat seal strength was sufficient ×: 20 or fewer people felt that the heat seal strength was sufficient

[0059] (Film torn) The roll product packages were torn apart at locations other than the heat-sealed areas, and the film's tear resistance was evaluated by 30 test subjects. The evaluation criteria were as follows: ◎: More than 28 people took a long time or used too much force to tear the film. 〇: Between 25 and 27 people took a long time to tear the film or used too much force △: Between 21 and 24 people took a long time to tear the film or used too much force. ×: Fewer than 20 people took a long time or used too much force to tear the film

[0060] (Roll compactness) The compactness of the roll was evaluated based on the roll density of the roll products stored in the prepared roll product package. The evaluation criteria were as follows: ◎: The roll density of the roll product is 0.22 g / cm 3 End Good: The roll density of the roll product is 0.19 g / cm 3 More than 0.21g / cm 3 below △: The roll density of the roll product is 0.14g / cm 3 More than 0.18g / cm 3 below ×: The roll density of the roll product is 0.13 g / cm 3 below

[0061] (Truck loading efficiency / transportability) The roll product packages thus produced were packed in cardboard boxes with the number of packs, number of layers, and number of pieces shown in Tables 1 and 2, and the condition of the roll product packages after being transported 100 km by truck was evaluated. The evaluation criteria were as follows: ◎: The printed parts of all the packages remained clear. ◯: Most of the printed parts of the package remained clear. △: Ink had peeled off from the printed area of ​​some parts of the package or had transferred to the surface of the roll product, but it was not serious enough to cause any problems. ×: For most of the packages, the ink on the printed part had peeled off or transferred to the surface of the roll product.

[0062] The above evaluations and the measurement results of each parameter are shown in Tables 1 and 2.

[0063] [Table 1]

[0064] [Table 2]

[0065] As is clear from the results shown in Tables 1 and 2, the roll product packages of Examples 1 to 18 all had films that were resistant to ink peeling, had good heat sealability and were resistant to tearing, and were also excellent in roll compactness, loading efficiency and transportability on trucks. In contrast, Comparative Examples 1 to 8 all were inferior in any of the following: ink peeling from the film, film heat sealability, film tearing, roll compactness, loading efficiency and transportability on trucks. Therefore, the roll product package of the present invention maintains its compactness even when packaging a long roll product, the ink in the printed portion of the film is not easily peeled off, it has heat sealability, and maintains its strength, and further provides a roll product package with excellent loading efficiency and transportability. [Explanation of symbols]

[0066] 1 roll product package 2. Roll product 10 packaging bags 11 Main body 12 Grip part 13 Panel section 14 Mountain fold ridge 15 Finger hole 16 Film 17 Reinforcement film 18 Sealing part 19 Printing Department 20 Measuring Equipment 21 Base plate 22 Support plate 23 Roll insertion hole 24 Moving weight support plate 25 weight

Claims

1. A roll product package comprising a film packaging bag containing a plurality of roll products each having one ply of sanitary tissue paper wrapped therein, The roll product has a winding softness of 1.0 mm or more and 5.0 mm or less, a winding diameter of 95 mm or more and 168 mm or less, a roll weight (excluding the core) of 219 g or more and 388 g or less, and a roll density of 0.14 g / cm ３ 0.42g / cm or more ３ is as follows: The film includes a base layer, a printed portion, and a varnished layer, and has the printed portion and the varnished layer on the surface opposite to the surface in contact with the outside air, the thickness of the film is 18 μm / ply or more and 50 μm / ply or less, and the coating amount of the varnish is 1.5 g / m ２ 2.4g / m or more ２ 1. A roll goods package comprising:

2. The number of roll products stored is 4, 6, 8 or 12, The roll product is packaged in the packaging bag in two tiers, each tier having two rolls arranged in one or two rows, with the axial direction being vertical. The packaging bag is a cylindrical gusset bag, and has a substantially rectangular parallelepiped main body surrounding the roll product, and handle portions extending upward from opposing long sides of the upper side of the main body and joined to each other in a gable roof shape, The roll product package according to claim 1 , wherein the gripping portion is formed with a finger hole.

3. 2. The roll product package according to claim 1, wherein two packages are stacked vertically in two layers when packed in a corrugated cardboard box.

4. 2. The roll goods package of claim 1, wherein the varnish comprises at least a resin and an auxiliary.

5. 5. The roll product package according to claim 4, wherein the resin components contained in the varnish are polyamide resin in an amount of 50% by weight or more.

6. 10. The roll goods package of claim 1, wherein the film is corona treated.

7. 10. The roll goods package of claim 1, wherein the film is not corona treated.

8. The roll product package according to claim 1 , wherein the printed portion is disposed on a panel portion of the packaging bag.

Images