JP7492471B2 - Roll product packaging - Google Patents

Description

The present invention relates to a roll product package.

Roll product packages are available on the market, in which roll products, such as paper towels or nonwoven towels, are wound into a roll and stored in a packaging bag made of resin film. The packaging bags used in roll product packages are made of resin film, and generally have perforations formed in them to make them easier to open. Various proposals have been made for packaging bags with perforations for opening and for roll products packaged in packaging bags.

Patent Document 1 discloses a roll product package in which a group of four roll products is contained in a packaging bag in which the upper and lower parts of a cylindrically formed film are folded inward to flatten it, and the upper part is fused in the width direction, and the bag body extends downward from the fused part, with a handle part standing along the fused part and having a finger hole in the center, and a bag body part extending downward from the fused part. In this package, a perforation line for opening is formed between the upper and lower edges of the handle part and reaches the bag body part, and the total length of the perforation line for opening in the bag body part is equal to or greater than the sum of the diameter and inner diameter of the roll products. Patent Document 1 describes that an opening that makes it easy to remove the contained roll products can be easily formed, and that the roll products remaining after some of the multiple products are removed from the package can be stored hygienically.

Patent Document 2 discloses a packaging bag having a bag body that can accommodate multiple roll products, the bag body being made of a resin film that has the property of being torn linearly in one direction and has gas barrier properties, and a packaging bag having a notch with a linear cut extending in one direction (Claim 1, Figure 1). Patent Document 2 describes that the bag allows for proper storage of roll products and provides a packaging bag that is easier to open.

JP 2015-054717 A JP 2017-178431 A

In a roll product package containing multiple roll products, a valley is created between one roll product and the other roll products, and a resin film is stretched over the roll products, so providing perforations in the width direction of the roll products makes it easy to open. On the other hand, a roll product package containing only one roll product does not have a valley, so there is a problem that it is difficult to open and the roll product may not be easily removed. The roll product packages described in Patent Documents 1 and 2 contain multiple roll products, so they cannot solve the above-mentioned problem.

Therefore, if the tensile breaking strength of the perforations is made too low in order to improve ease of opening, there is the problem that the package may be opened at an unintended time due to shocks during transportation, etc. The thickness of the resin film also poses another problem: if it is too thin, it may lead to accidental opening of the perforations, while if it is too thick, it may be difficult to open. In addition, if the inner roll product is wound too softly, it is difficult to transmit force to the resin film when opening, making it difficult to tear the perforations, and conversely, if it is wound too tightly, the resin film will be in a taut state, raising the risk of accidental opening of the perforations, creating yet another problem.

In addition, in a roll product package containing one roll of roll product, caramel packaging is preferred, but in the caramel packaging form, a pattern of heat seal adhesive parts (hereinafter also referred to as "heat seal parts") exists on the top and bottom surfaces to fix the caramel packaging. When the perforation and the heat seal part are crossed, if the angle between the heat seal part pattern and the perforation is too large, the tearing of the perforation stops at the heat seal part, making it difficult to remove the roll product from the packaging bag. On the other hand, if the angle between the heat seal part pattern and the perforation is too small, the perforation may tear unintentionally during heat sealing, causing defects such as holes.

Furthermore, if the pattern of the heat-sealed portion is enlarged in order to ensure the aesthetic appeal of the packaging, the perforations and the heat-sealed portion are more likely to come into contact, and when removing the roll product from the roll product package, the tearing of the perforations stops halfway, making it difficult to remove. Conversely, if the heat-sealed portion is reduced too much in order to ensure ease of removal, packaging defects such as accidental opening during transportation may occur, and the cosmetic appearance may be inferior.

As described above, conventional roll product packages with perforations for opening have problems with ease of opening, preventing accidental opening, and ease of removing the roll product from inside the packaging bag.

The object of the present invention is to provide a roll product package that is caramel-wrapped, easy to open, allows the roll product inside to be easily removed, and prevents accidental opening in unintended situations such as during processing, transportation, or when dropped.

As a result of extensive research into solving the above problems, the inventors discovered that a desired roll product package can be obtained by setting the width of the heat seal portion and the tensile breaking strength of the opening perforation within respective prescribed ranges, and thus completed the present invention. In other words, the present invention relates to the following roll product package.

(1) A roll product package in which one roll of a roll product made of paper towels wound into a roll is caramel-wrapped in a resin film,
Heat seal portions provided in a predetermined pattern on the top and bottom surfaces of the roll product packaging;
and a perforation portion for opening provided in the width direction of the roll product from the top surface to the bottom surface,
The tensile breaking strength of the perforation portion is 3 N/50 mm or more and 53 N/50 mm or less;
The width of the heat-sealed portion is 1 mm or more and 15 mm or less.
(2) The roll product packaging of (1) above, wherein the perforation portion is an alternating arrangement of perforation cut portions and non-perforation cut portions, and a ratio A represented by the formula: [total length of the non-perforation cut portions/(total length of the perforation cut portions+total length of the non-perforation cut portions)×100] is 25% or more and 75% or less.
(3) A package of one roll of film according to (2) above, in which the length of each of the perforated cut portions is 1 mm or more and 10 mm or less, and the length of each of the non-perforated cut portions is 1 mm or more and 10 mm or less.
(4) The roll product packaging according to any one of (1) to (3) above, wherein the tear strength of the resin film is 0.2 N or more and 3.0 N or less.
(5) The roll product packaging according to any one of (1) to (4) above, wherein the thickness of the resin film is 20 μm or more and 50 μm or less.
(6) Any of the roll product packages according to (1) to (5) above, having a plurality of heat-sealed portions extending approximately parallel to each other on the top and bottom surfaces, and the width of the non-heat-sealed portion between one heat-sealed portion and another heat-sealed portion adjacent thereto is 1 mm or more and 16 mm or less.
(7) The roll product packaging according to (6) above, in which the ratio B, expressed by the formula: [(width of the heat-sealed portion)/(width of the heat-sealed portion+width of the non-heat-sealed portion)×100], is 15% or more and 75% or less on the top and bottom surfaces.
(8) The roll product package according to any one of (1) to (7) above, wherein the paper towel has a basis weight of 40 g/ ^m2 or more and 150 g/ ^m2 or less.
(9) The roll product package according to any one of (1) to (8) above, wherein the roll density of the roll product is 0.05 g/ ^cm3 or more and 0.16 g/ ^cm3 or less.
(10) The roll product packaging of any one of (1) to (9) above, wherein the paper towel has a paper thickness of 200 μm or more and 1,300 μm or less.
(11) The roll product package according to any one of (1) to (10) above, wherein the roll product has a winding diameter of 90 mmφ or more and 160 mmφ or less.
(12) Any of the film packagings according to (1) to (11) above, in which the ratio C of the circumference of the roll product to the inner circumference of the film packaging, expressed by the formula: [(circumference of the roll product/inner circumference of the film packaging) x 100], is 70% or more and 100% or less.
(13) Any of the film packagings according to (1) to (12) above, in which the ratio D in the roll product packaging, expressed by the formula: [(circumference of the roll product x roll density of the roll product / inner circumference of the film packaging) x 100], is 5 or more and 16 or less.

The present invention provides a roll product package that is caramel-wrapped, easy to open, allows the roll product inside to be easily removed, and prevents accidental opening in unintended situations such as during processing, transportation, or when dropped.

FIG. 1 is a perspective view illustrating a schematic configuration of a roll product package according to an embodiment of the present invention. 2 is a schematic plan view showing an enlarged configuration of the top surface (or bottom surface) of the roll product package according to the embodiment shown in FIG. 1 . FIG. 2 is a schematic cross-sectional view of the one-roll product package according to the embodiment shown in FIG. 1 in a direction perpendicular to the longitudinal direction. FIG. 10A to 10D are schematic plan views showing the configuration of the top surface (or bottom surface) of a roll product package according to another embodiment, each of which shows a top surface (or bottom surface) of a different embodiment. FIG. 11 is a schematic plan view showing the configuration of the top surface (or bottom surface) of a roll product package according to a comparative example. FIG. 1 is a perspective view of one embodiment of a roll product.

The following describes in detail an embodiment of the present invention with reference to the drawings.

<Roll product packaging>
1 to 4 show a roll product package 1 according to the present embodiment (hereinafter also simply referred to as a "one-roll package") or a modified example thereof. FIG. 6 shows an embodiment of a roll product 10.
As shown in FIG. 1, the one-roll package 1 of the present embodiment is a package bag 2 made of a resin film (hereinafter also simply referred to as a "film"), which contains one roll (one piece) of a one-ply roll product 10, which is a long paper towel 14 wound into a roll shape. In the present embodiment, the roll product 10 is contained in the package bag so that the axial direction of the roll product 10 coincides with the MD direction of the resin film constituting the package bag 2. The one-roll package 1 of the present embodiment has a heat seal bonding portion (hereinafter also simply referred to as a "heat seal portion") 20 having a predetermined pattern formed on the top surface 11 and the bottom surface 12, and a perforation portion 30 provided in the width direction of the roll product 10 from the top surface 11 through the side surface 13 to the bottom surface 12. By defining each configuration described below, the perforation portion 30 can be easily opened, the roll product 10 inside can be easily removed, and the perforation portion 30 can be prevented from tearing (mis-opening) in unintended situations such as during processing, transportation, or dropping.
The details of each component are as follows:

The one-roll package 1 is a roll product package in which one roll (one piece) of roll product 10, which is formed by winding up paper towels 14 into a roll shape, is caramel-wrapped with a resin film so that both widthwise end faces of the roll product 10 face the top surface 11 and bottom surface 12 of the packaging bag 2, respectively. The one-roll package 10 has caramel-wrapped surfaces on the top surface 11 and bottom surface 12, and further has a heat-sealed portion 20 and a perforated portion 30 as described above.

(Heat seal part)
As shown in Figs. 1 and 2, the heat-sealed portion 20 of this embodiment is formed in a pattern in which a plurality of band-shaped heat-sealed portions 20 extend in one direction in a substantially parallel manner on the top surface 11 and the bottom surface 12 of the packaging bag 2 made of a resin film. As shown in Fig. 2, the width a of one heat-sealed portion 20 is 1 mm or more and 15 mm or less, preferably 2 mm or more and 12 mm or less, and more preferably 3 mm or more and 8 mm or less. If the width a is less than 1 mm, the adhesive strength of the caramel packaging becomes insufficient, and the film tends to be easily opened by mistake in unintended situations such as during processing, transportation, or when dropped. If the width a exceeds 15 mm, even if the perforation portion 30 is configured as specified in this embodiment, it tends to be difficult to open the perforation portion 30 and to make it difficult to remove the roll product.

In a preferred embodiment, in the multiple heat-sealed sections 20 formed on the top surface 11 and the bottom surface 12 and extending almost parallel to each other, as shown in FIG. 2, the width b of the non-heat-sealed section 21 located between one heat-sealed section 20 and the other adjacent heat-sealed section 20 is 1 mm or more and 16 mm or less, more preferably 2 mm or more and 13 mm or less, and even more preferably 3 mm or more and 9 mm or less. If the width b is less than 1 mm, the width a of the heat-sealed section 20 becomes relatively too large, and even if the perforated section 30 is configured as specified in this embodiment, it tends to be difficult to open the perforated section 30 and to make it difficult to remove the roll product. If the width b exceeds 16 mm, the width a of the heat-sealed section 20 becomes relatively too small, the adhesive strength of the caramel packaging becomes insufficient, and the film tends to be easily opened by mistake in unintended situations such as during processing, transportation, or when dropped.

In a preferred embodiment, the width of the heat-sealed portion 20 and the width of the non-heat-sealed portion 21 have the following relationship. The ratio B (%), expressed by the formula: [(width of the heat-sealed portion 20)/(width of the heat-sealed portion 20+width of the non-heat-sealed portion 21)}×100, is, for example, in the range of 15 to 75, in the range of 28 to 71, or in the range of 35 to 62. By adjusting the width of the heat-sealed portion 20 and the width of the non-heat-sealed portion 21 so that the ratio B falls within the aforementioned range, it is possible to prevent the film from being opened accidentally, to increase the ease of opening the perforation portion 30, and to improve the aesthetic appearance of the one-roll package 1.

The pattern of the heat-sealed portion 20 is not limited to this embodiment, and may be, for example, as shown in FIG. 4, a pattern in which a plurality of slightly narrow band-shaped heat-sealed portions 20a extend in one direction substantially parallel to each other, and a non-heat-sealed portion 21a slightly wider than the heat-sealed portion 20a is formed between adjacent heat-sealed portions 20a (FIG. 4(a)), a pattern in which a plurality of slightly narrow band-shaped heat-sealed portions 20b extend in one direction substantially parallel to each other, and a non-heat-sealed portion 21b that is considerably wider (about 4 to 5 times wider) than the heat-sealed portion 20b is formed between adjacent heat-sealed portions 20b (FIG. 4(b)), and a pattern in which a plurality of slightly narrow band-shaped heat-sealed portions 20c extend in one direction substantially parallel to each other, and a non-heat-sealed portion 21b that is considerably wider (about 4 to 5 times wider) than the heat-sealed portion 20b is formed between adjacent heat-sealed portions 20b (FIG. 4(b)). Examples of such a pattern include a pattern in which non-heat-sealed portions 21c that are significantly narrower than the heat-sealed portions 20c are formed between mating heat-sealed portions 20c (FIG. 4(c)), a pattern in which multiple slightly narrow dashed-line heat-sealed portions 20d extend substantially parallel to one direction, and non-heat-sealed portions 21d that are wider than the heat-sealed portions 20d (about two to three times wider) are formed between adjacent heat-sealed portions 20d (FIG. 4(d)), and further examples include a lattice pattern in which one group of multiple heat-sealed portions 20 extending in parallel intersects perpendicularly with another group of multiple heat-sealed portions 20 extending in parallel, and a pattern in which two types of heat-sealed portions 20 with different widths extend alternately and parallel to one another. Furthermore, as shown in FIG. 5, if the entire top surface (or bottom surface) 1A is made into a heat-sealed portion 40, when the perforated portion 30 is opened, the tearing of the perforated portion 30 stops at the boundary area between the top surface (or bottom surface) 1A and the side surface, etc., and the roll product 10 inside becomes less easily removable.

(Perforated section)
In the present embodiment, the perforation section 30 is a linear arrangement of alternating perforation cut sections that penetrate the resin film constituting the packaging bag 2 in the thickness direction and non-perforation cut sections where the resin film remains as is. The length of each perforation cut section is, for example, in the range of 1 mm to 10 mm, 2 mm to 9 mm, or 3 mm to 8 mm. The length of each non-perforation cut section is, for example, in the range of 1 mm to 10 mm, 2 mm to 9 mm, or 3 mm to 8 mm. By selecting the length of each of the perforation cut section and the non-perforation cut section from the above-mentioned range, for example, it becomes easier to adjust the tensile breaking strength of the perforation section 30 described later to a predetermined range. The arrangement of the perforation cut sections and the non-perforation cut sections in the perforation section 30 may be curved, but is preferably linear.

The tensile breaking strength of the perforation portion 30 is in the range of 3N/50mm to 53N/50mm, preferably 8N/50mm to 41.5N/50mm, more preferably 15.5N/50mm to 28N/50mm. By setting the tensile breaking strength of the perforation portion 30 in the above-mentioned range, when removing the roll product 10 from the one-roll packaging body 1, it is possible to open the roll product 10 without requiring a large force, so that an opening of a size that makes it easy to remove the roll product 10 is formed, and it is possible to prevent the perforation portion 30 from accidentally tearing when it is not needed. If the tensile breaking strength of the perforation portion 30 is less than 3N/50mm, the perforation portion 30 tends to accidentally tear when it is not needed, and if it exceeds 53N/50mm, even if the width a of the heat seal portion 20 is set to the above-mentioned predetermined range, it tends to be difficult to open smoothly or the opening does not tend to be large enough to easily remove the roll product 10. The tensile breaking strength of the perforation section 30 can be adjusted by, for example, selecting the material and thickness of the resin film, the length of each of the perforation cut sections and non-perforation cut sections, etc.

The tensile breaking strength of the perforation portion 30 can be measured, for example, using a Tensilon universal testing machine STB-1225S (manufactured by A&D Co., Ltd.) in accordance with a method conforming to JIS P 8113. The test piece has a width dimension (direction perpendicular to the tensile direction of the Tensilon universal testing machine) of 50 mm, a gripping distance of 100 mm, a tensile speed of 300 mm/min, a measurement temperature of 23°C, a relative humidity of 50%, and a tensile direction in the TD direction of the film (the direction in which the perforations are perpendicular to the tensile direction). The tensile breaking strength was measured six times, and the average values are shown in Tables 1 to 3.

In a preferred embodiment, the ratio A (%), expressed by the formula: [(length of non-perforation cut portion/(length of perforation cut portion+length of non-perforation cut portion)) x 100], is in the range of 25% to 75%, 33% to 67%, or 40% to 60%. By setting the ratio A in the above-mentioned range, for example, it is possible to achieve a high level of both ease of tearing when opening the perforation portion 30 and prevention of unnecessary tearing of the perforation portion 30. Here, the length of the perforation cut portion means the total length of the perforation cut portion in the entire length of the perforation portion 30, and the length of the non-perforation cut portion means the total length of the non-perforation portion in the entire length of the perforation portion 30.

In another embodiment, the perforation portion 30 is not formed on the top surface 11 and bottom surface 12 of the packaging bag, but is formed in a specified area on the side of the packaging bag 2.

In this embodiment, most of the perforation 30 is provided on the side surface 13 of the roll product 10. This reduces the contact area between the inner surface of the cardboard box or the one-roll package 1 and the perforation 30 when the roll product 10 is packed in the cardboard box and transported. This also prevents the perforation 30 from being opened unintentionally. In addition, the one-roll package 1 of this embodiment is packaged so that the TD direction, in which the strength of the resin film is lower than the MD direction, is the axial circumferential direction of the roll product 10. This means that there is a risk of the perforation being opened unintentionally. However, by specifying the tensile breaking strength of the perforation and the pattern and width of the perforation 30 and the heat seal portion 20 as in this embodiment, the ease of opening the perforation and the ease of removing the roll product are improved.

<Roll products>
FIG. 6 is a perspective view showing a schematic appearance of the roll product 10 according to the present embodiment. The roll product 10 according to the present embodiment is a roll of one ply of paper towels 14 wound into a roll shape, but is not limited thereto, and may be configured to wind up two or more plies of paper towels 14 into a roll shape. The roll product 10 has a core 15 such as a cylindrical paper core or a cylindrical space in the center, and has an outer diameter (winding diameter) DR and an outer diameter DI of the core 15. In addition, of the two surfaces of the paper towel 14, the surface facing the outside of the roll product 10 is also called the surface 14a of the paper towel 14, and the surface facing the core 15 of the roll product 10 is also called the back surface 14b of the paper towel 14. The following are typical characteristics of the roll product 10. By adjusting these characteristics to a predetermined range, the effects of the present embodiment, namely, ease of opening and prevention of unexpected tearing of the perforation portion 30 when not required, are further improved.

(Volume length)
The winding length of the roll product 10 is, for example, in the range of 7 m to 23 m, in the range of 10 m to 20 m, or in the range of 13 m to 18 m. If the winding length of the roll product 10 is less than 7 m, the winding diameter of the roll product 10 becomes small, making it difficult to apply force to the perforation portion 30 when opening the roll product 10, and therefore the perforation portion 30 tends to be difficult to open. If the winding length of the roll product 10 exceeds 23 m, the winding diameter becomes large, making it difficult to hold the roll product 10 in one's hand, and therefore the perforation portion 30 tends to be difficult to open. According to this embodiment, the winding length of the roll product 10 can be adjusted to the above-mentioned range to make it easier to open the perforation portion 30 of the roll product 10.

(Roll diameter)
The roll diameter (roll diameter DR) of the roll product 10 is, for example, in the range of 90 mm to 160 mm, in the range of 100 mm to 140 mm, or in the range of 110 mm to 130 mm. If the roll diameter of the roll product 10 is less than 90 mm, it is difficult to apply force to the perforation portion 30 when opening the roll product 10, and therefore the perforation portion 30 tends to be difficult to open. On the other hand, if the roll diameter exceeds 160 mm, it is difficult to hold the roll product 10 and the perforation portion 30 tends to be difficult to open. According to this embodiment, the roll diameter of the roll product 10 can be adjusted to the above-mentioned range to make it easier to open the perforation portion 30 of the roll product 10.

(Circumference)
The circumferential length of the roll product 10 is the length in the circumferential direction of an unused roll product 10, and is, for example, in the range of 310 mm to 530 mm, in the range of 330 mm to 470 mm, or in the range of 350 mm to 420 mm. According to this embodiment, it is possible to achieve both ease of opening the perforated portion 30 of the roll product 10 and prevention of breakage of the perforated portion 30 when it is not necessary. If the circumferential length is less than 310 mm, it becomes difficult to apply force to the perforated portion 30 when opening, so that the perforated portion 30 tends to be difficult to open, and if it exceeds 530 mm, the perforated portion 30 tends to be difficult to open or unnecessary breakage of the perforated portion 30 tends to occur.

(Roll Density)
The roll density of the roll product 10 is, for example, in the range of 0.05 g/ ^cm3 to 0.16 g/ ^cm3 , in the range of 0.07 g/ ^cm3 to 0.14 g/ ^cm3 , or in the range of 0.09 g/ ^cm3 to 0.12 g/ ^cm3 . The roll density of the roll product 10 can be determined by the following method. First, the roll density is determined from the formula: roll mass/[{cross-sectional area of the roll outer diameter (winding diameter DR) portion}-(cross-sectional area of the core outer diameter DI portion)]×roll width (calculated based on 275 mm). For example, when the roll mass per 275 mm of roll width is 327 g, the winding diameter DR is 122 mm, and the core outer diameter DI is 39 mm, the roll density = 327 g ÷ [{3.14 × (122 mm ÷ 2 ÷ 10) 2 - 3.14 × (39 mm ÷ 2 ÷ 10) 2} × (275 mm ÷ 10)] = 0.11 g/cm ^3. When the roll product 10 does not have a core 15, the diameter of the central hole is taken as the core outer diameter DI. The roll mass does not include the mass of the core.

If the roll density is less than 0.05 g/cm ³ , the roll diameter becomes large and the perforation portion 30 tends to be difficult to open. In addition, the winding force of the inner winding may be too weak, causing the inner winding side of the roll to protrude in the axial direction, resulting in a defective product. On the other hand, if the roll density exceeds 0.16 g/cm ³ , the roll product 10 is difficult to deform, the film is in a taut state, and the film tends to be erroneously opened when dropped, etc. According to this embodiment, by adjusting the roll density (roll density) of the roll product 10 to the above-mentioned range, the perforation portion 30 can be easily opened and erroneous opening can be prevented.

(Core outer diameter)
The core 15 is located at the center of the roll product 10 and has a substantially circular cross section around which the paper towels 14 are wound. The roll product 10 may have a paper tube inserted therein or may have a hollow portion. The core outer diameter is the outer diameter of the aforementioned core portion (paper tube, hollow portion, etc.). The core outer diameter is, for example, in the range of 30 mm to 60 mm, 34 mm to 55 mm, or 37 mm to 50 mm. According to this embodiment, it is possible to wind an amount of paper towels 14 around one roll product 1 that will not deteriorate during its use. In addition, since the winding diameter of the roll product 10 does not become larger than necessary, the ease of opening the perforation portion 30 is maintained.
The roll width of the roll product 10 is, for example, in the range of 180 mm to 350 mm, in the range of 210 mm to 325 mm, or in the range of 240 mm to 300 mm.

In a preferred embodiment, as shown in FIG. 3, in the one-roll packaging 1, the ratio C of the circumference x of the roll product 10 to the inner circumference y of the one-roll packaging 1 is, for example, in the range of 70% to 100%, in the range of 80% to 100%, or in the range of 90% to 100%. Here, the ratio C (%) = (circumference x of the roll product 10 / inner circumference y of the one-roll packaging 1) x 100. By setting the ratio C in the above-mentioned range, the ease of opening the perforation portion 30 of the roll packaging 1 is maintained and the perforation portion 30 can be prevented from being unintentionally torn. The inner circumference y of the packaging bag 2 of the one-roll packaging 1 is, for example, in the range of 310 mm to 530 mm, in the range of 330 mm to 470 mm, or in the range of 350 mm to 420 mm.

In another preferred embodiment, in one roll packaging 1, the ratio D is, for example, in the range of 5% to 16%, in the range of 7% to 14%, or in the range of 9% to 12%. Here, the ratio D (%) = [(circumference of roll product 10 x roll density of roll product 10) / inner circumference of one roll packaging 1] x 100. By setting the ratio D in the above-mentioned range, for example, the ease of opening the perforation portion 30 of the roll packaging 1 is maintained, and unintentional tearing of the perforation portion 30 can be prevented.

<Paper towels>
(Material)
The paper towel 14 used in this embodiment preferably contains synthetic fibers and pulp fibers. Examples of synthetic fibers include synthetic fibers made of synthetic resins such as nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene. Among these, from the viewpoint of obtaining the one-roll package 1 of this embodiment in which the perforation portion 30 has good openability, polyethylene fibers, polypropylene fibers, and the like are preferred, and polypropylene fibers are more preferred. The paper towel 14 may be a nonwoven fabric containing synthetic fibers. The nonwoven fabric is not particularly limited, but spunbond nonwoven fabric and the like are preferred. In addition, as the pulp fiber, the content of NBKP (softwood bleached kraft pulp) is, for example, in the range of 50% by mass or more and 100% by mass or less, in the range of 70% by mass or more and 100% by mass or less, or in the range of 90% by mass or more and 100% by mass or less, and the content of LBKP (hardwood bleached kraft pulp) is, for example, in the range of 50% by mass or less, in the range of 30% by mass or less, or in the range of 10% by mass or less. As the NBKP, for example, fibers made of radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir are preferable. It is also possible to use NUKP instead of NBKP, and LUKP instead of LBKP. In this case, the synthetic fiber content in the paper towel 14 is, for example, in the range of 5% to 45%, in the range of 9% to 38%, or in the range of 12% to 28%. In addition, the pulp fiber content in the paper towel 14 is, for example, in the range of 55% to 95%, in the range of 62% to 91%, or in the range of 72% to 88%.

When a paper towel 14 containing such synthetic fibers and pulp fibers is made, the roll diameter and roll density are within an appropriate range, the perforation section 30 remains easy to open, and unintentional tearing of the perforation section 30 can be prevented.

(Sheet length)
The sheet length of the paper towel 14 in the width direction (CD direction) of the roll product 10 is, for example, in the range of 180 mm to 350 mm, in the range of 210 mm to 325 mm, or in the range of 240 mm to 300 mm. By setting the length of the paper towel 14 in the CD direction within the above-mentioned range, the roll product 10 can be easily taken out. In addition, the length of the paper towel 14 in the MD direction (pitch) perpendicular to the CD direction is, for example, in the range of 160 mm to 330 mm, in the range of 180 mm to 305 mm, or in the range of 200 mm to 280 mm. By setting the length of the paper towel 14 in the MD direction within the above-mentioned range, the roll diameter is in an appropriate range, and the perforation portion 30 can be easily opened.

(grammage)
The basis weight per ply of the paper towel 14 is, for example, in the range of 40 g/m ² to 150 g/m ² , in the range of 48 g/m ² to 100 g/m ² , or in the range of 55 g/m ² to 80 g/m ^2. According to the present embodiment, by adjusting the basis weight per ply of the paper towel 14 to the above-mentioned range, the roll diameter is in an appropriate range, the perforation portion 30 is easily opened, and unintentional opening of the perforation portion 30 can be prevented. If the basis weight per ply of the paper towel 14 is less than 40 g/m ² , the roll diameter becomes small and it becomes difficult to apply force to the perforation portion 30 when opening, so that the perforation portion 30 tends to be difficult to open. On the other hand, if the basis weight exceeds 150 g/m ² , the roll mass becomes large, and the load on the perforation portion 30 becomes large when dropped or processed, so that unintentional opening of the perforation portion 30 is likely to occur.
Next, the main characteristics of the paper towel 14 will be described.

(Paper thickness)
The paper thickness per ply of the paper towel 14 is, for example, in the range of 200 μm to 1300 μm, 300 μm to 1100 μm, or 400 μm to 900 μm. According to this embodiment, the usability of the paper towel 14 is improved, the paper towel 14 is not unnecessarily torn during use, the frequency of replacing the roll product 10 is reduced, and unintentional opening of the perforation portion 30 can be prevented. If the paper thickness per 10 plies of the paper towel 14 is less than 200 μm, the roll diameter becomes small, and it becomes difficult to apply force to the perforation portion 30 when opening the paper towel 14, so that the perforation portion 30 tends to be difficult to open. In addition, if the paper thickness exceeds 1300 μm, the roll diameter becomes large, and the roll product becomes difficult to hold, so that the perforation portion 30 tends to be poor in opening properties.

Methods for adjusting the basis weight per ply and the thickness per ply of the paper towel 14 to the aforementioned ranges include specifying the calendaring conditions of the base paper web (thickness and specific volume after calendaring, difference in thickness before and after calendaring) and embossing conditions.

The specific volume per ply of the paper towel 14 is, for example, in the range of 5 cm ³ /g to 15 cm ³ /g, 6 cm ³ /g to 13 cm ³ /g, or 7 cm ³ /g to 11 cm ³ /g. The specific volume is calculated by dividing the thickness of the paper towel 14 by the basis weight of the paper towel 14. According to this embodiment, by adjusting the specific volume of the paper towel 14 to the above-mentioned range, it is possible to achieve both ease of opening the perforation portion 30 and resistance to erroneous opening at a higher level. If the specific volume of the paper towel 14 is less than 5 cm ³ /g, the ease of opening the perforation portion 30 tends to be poor, and if it exceeds 15 cm ³ /g, erroneous opening tends to occur more easily.

(embossed pattern)
The paper towel 14 of the present embodiment may be embossed. In the embossing, it is preferable to carry out a heat embossing process using a matched steel (steel match) with a roll winder. The shape of the embossed portion alone is not particularly limited, and examples thereof include a circle, an ellipse, a rectangle, a square, a floral pattern, a polygon, a letter, a line, a logo, and the like. Among these, a hexagonal shape is preferable to obtain a one-roll package 1 with an easy-to-open perforation at a predetermined winding diameter as in the present embodiment. The depth of the embossed pattern is, for example, in the range of 0.05 mm to 2 mm, in the range of 0.2 mm to 1.5 mm, or in the range of 0.3 mm to 1.0 mm. The depth of the embossed pattern can be measured, for example, by the method described in JP 2017-131545 A.

(Method of Manufacturing Paper Towels and Rolled Paper Towels)
As for the manufacturing method of the paper towel 14 and the roll product 10, when the paper towel 14 is a kitchen towel containing synthetic fibers and pulp fibers, it can be manufactured, for example, in the following order: (1) laminating pulp fibers onto a specified spunbond nonwoven fabric and hydroentangling, (2) embossing, and (3) rolling up.
In this case, in the (1) hydroentanglement of the production method, the synthetic fibers are hydroentangled with the pulp fibers to obtain a nonwoven fabric containing the synthetic fibers and the pulp fibers. The hydroentanglement method is preferably carried out by the method described in JP 2018-193634 A, for example.

<Packaging bag>
In this embodiment, the roll product 10 is packaged in a packaging bag 2 made of a resin film so as to conform to the surface shape of the roll product 10, and the packaging form is caramel packaging. Caramel packaging is well known, and involves wrapping the roll product 10 in a resin film extending along one direction of the roll product 10 in a direction intersecting this direction, or inserting the roll product 10 into one end of a resin film previously formed into a cylindrical shape in the axial direction. Then, of the resin film protruding from both ends of the roll product 10, two opposing flap-shaped sides are folded against each other, and then two other opposing flap-shaped sides are folded against each other in the same manner, and these folded parts are sealed by heat fusion or the like. The area sealed by heat fusion is the part indicated by the heat seal part 20 in FIG. 1.

The resin film constituting the packaging bag 2 may be formed as a single layer or multiple layers. The material of the resin film is preferably a thermoplastic resin suitable for recycling. Specific examples of thermoplastic resins include polyolefins (polyethylene, polypropylene, etc.), polyesters (PET, etc.), polyamides (nylon, etc.), polycarbonates, polystyrenes, polyvinyl chlorides, etc. Among these, polyethylene films are preferred from the viewpoint of fully exerting the effects of this embodiment.

The thickness of the resin film is, for example, in the range of 20 μm to 50 μm, 25 μm to 45 μm, or 30 μm to 40 μm. If the thickness of the resin film is less than 20 μm, the film is more likely to be accidentally opened during heat sealing in the packaging process, and if it exceeds 50 μm, the perforation portion 30 tends to be difficult to open. According to this embodiment, by adjusting the thickness of the resin film constituting the packaging bag to the above-mentioned range, the film is less likely to be accidentally opened during heat sealing in the packaging process, and the perforation portion 30 can be made easier to open. The thickness of the resin film can be measured in accordance with JIS K 7130.

The tensile breaking strength of the resin film is, for example, in the range of 5 N/10 mm to 20.5 N/10 mm, 9 N/10 mm to 19.5 N/10 mm, or 12 N/10 mm to 18 N/10 mm. By setting the tensile breaking strength of the resin film within the above range, the risk of erroneous opening tends to be further reduced. The tensile breaking strength of the resin film can be measured in accordance with JIS K 7127.

The tear strength of the resin film is, for example, in the range of 0.2 N to 3.0 N, 0.3 N to 2.0 N, or 0.4 N to 1.0 N. By setting the tear strength of the resin film within the above range, it is possible to achieve both ease of opening the perforation portion 30 and the prevention of erroneous opening. The film tear strength can be measured in accordance with JIS K 7128-2. In addition, the tear strength in this embodiment refers to the strength when the film is torn in the MD direction (the direction parallel to the width direction of the roll product when packaged).

The present invention has been described above using an embodiment, but it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiment, and it is clear to those skilled in the art that various modifications and improvements can be made to the above embodiment. Furthermore, it is clear from the description of the claims that forms incorporating such modifications or improvements can also be included in the technical scope of the present invention.

The following examples and comparative examples will explain this embodiment in more detail.

(Examples 1 to 25 and Comparative Examples 1 to 7)
(1) Pulp fibers were laminated on a polypropylene spunbond nonwoven fabric to perform hydroentanglement, (2) embossing, and (3) roll winding to produce paper towels and roll products shown in Tables 1 to 3. In (1) hydroentanglement, pulp fibers were hydroentangled with synthetic fibers according to the method described in JP 2018-193634 A to obtain a nonwoven fabric containing synthetic fibers and pulp fibers. In (2) embossing, a heat embossing process using a matched steel (steel match) was performed with a roll winder. The shape of the embossed unit was hexagonal. Next, using a caramel packaging machine (model: CASMATIC CMW525, manufactured by FABIO PERINI), one roll product was caramel-packaged with a packaging film bag made of polyethylene with pre-perforations so that perforations were formed that followed the surface shape of the roll product and reached the bottom from the top to the sides, and furthermore, heat-sealed parts were formed on the top and bottom in a pattern in which 15 band-shaped heat-sealed parts were arranged in parallel and at approximately equal intervals, producing a one-roll package. In the obtained one-roll package, the axial direction of the roll product coincided with the MD direction of the film constituting the packaging bag.

The following measurements were carried out on the examples and comparative examples prepared as described above. Each measurement was carried out after maintaining the sample in equilibrium under the temperature and humidity conditions specified in JIS P 8111 (23±1°C, 50±2% RH).

Basis weight: Measured according to JIS P8124 and converted to per sheet.

Paper thickness: Measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). Measurement conditions were a measurement load of 3.7 kPa, a gauge diameter of 30 mm, the sample was placed between the gauge and the measuring table, and the gauge was read when the gauge was lowered at a speed of 1 mm per second or less. The measurement was repeated 10 times and the results were averaged. The measurement was performed with three paper towels stacked on top of each other, and the value was divided by three to obtain the paper thickness value.

Roll length: For paper towels with perforations extending widthwise and spaced at a specified distance in the longitudinal direction, the length of 10 sheets was measured for the sheets between one perforation and the adjacent perforation. The number of sheets on the roll was then measured, and the roll length was calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.515 m and the number of sheets is 330, then the roll length is 1.515 m x (330/10) = 50 m. Note that if the paper towel does not have perforations, the roll length was calculated by measuring it.

Roll winding diameter DR, core outer diameter DI: 10 rolls were measured using a diameter rule manufactured by Muratec KDS Co., Ltd., and the measurement results were averaged.

For roll density, 10 rolls were measured using the above method, and the measurement results were averaged. For the tensile breaking strength of the perforations, 10 single roll packages were measured, and the average of the measured values was calculated.

The one-roll packages of the Examples and Comparative Examples were evaluated for the following items. For each item, ⊚, ◯, and △ were rated as pass.
<Easy to open perforations>
Twenty test subjects held each roll package with both hands, centered around the perforation on the side, and tore it open to the left and right with their thumbs. Based on the results, the products were evaluated according to the following criteria.
◎: When 18 to 20 people felt it was good. ○: When 14 to 17 people felt it was good. △: When 10 to 13 people felt it was good. ×: When 6 to 9 people felt it was good. ××: When no people felt it was good, or when 1 to 5 people felt it was good.

<Hard to open by mistake>
One roll package was vertically set in the axial direction, and 12 rolls were packed in a cardboard box, and the rolls were vibrated at 1 round trip per second for 1 minute between 50 cm up and down and 50 cm left and right. This was repeated 10 times (a total of 120 rolls were evaluated), and then the perforation was evaluated for erroneous opening. The inner dimensions of the cardboard were: long side: roll diameter of the roll product x 4, short side: roll diameter of the roll product x 3. The ratio (percentage, %) of the number of packages that were erroneously opened to the total number of packages was calculated as (number of packages that were erroneously opened/total number of packages) x 100, and the evaluation was performed according to the following criteria.
◎: 1% or less 〇: 2% to 5% △: 6% to 9% ×: 10% to 15% ××: 15% or more

<Ease of removal of roll products>
Based on the evaluations of 20 monitors, the following criteria were used to evaluate whether the roll product could be removed from the opening formed by opening the perforations without the roll product getting caught on any part of the opening.
◎: When 18 to 20 people felt it was good. ○: When 14 to 17 people felt it was good. △: When 10 to 13 people felt it was good. ×: When 6 to 9 people felt it was good. ××: When no people felt it was good, or when 1 to 5 people felt it was good.

<Beautiful packaging>
Twenty monitors visually observed the appearance of one roll package and rated it according to the following criteria.
◎: When 18 to 20 people felt it was good. ○: When 14 to 17 people felt it was good. △: When 10 to 13 people felt it was good. ×: When 6 to 9 people felt it was good. ××: When no people felt it was good, or when 1 to 5 people felt it was good.

The results are shown in Tables 1 to 3.

From Tables 1 to 3, it can be seen that by setting the width of the heat-sealed portion within a prescribed range on the top and bottom surfaces of the one-roll package and setting the tensile breaking strength of the perforation portion within a prescribed range, a one-roll package can be obtained that has a high level of the three characteristics of ease of opening the perforations, resistance to accidental opening, and ease of removal of the roll product.

1 Roll product packaging (1 roll packaging)
2 Packaging bag 10 Roll product 11 Top surface 12 Bottom surface 13 Side surface 14 Paper towel 15 Core 20, 20a, 20b, 20c, 20d Heat-sealed portion 21, 21a, 21b, 21c, 21d Non-heat-sealed portion 30 Perforation portion

Claims (13)

A roll product package in which one roll of a roll product made of paper towels wound into a roll shape is caramel-wrapped in a resin film,
Heat seal portions provided in a predetermined pattern on the top and bottom surfaces of the roll product packaging;
The roll product package further includes a top surface and a bottom surface, the top surface being continuous with the bottom surface and the bottom surface of the roll product package.
The tensile breaking strength of the perforation portion is 3 N/50 mm or more and 53 N/50 mm or less;
The width of the heat-sealed portion is 1 mm or more and 15 mm or less. The roll product package according to claim 1, wherein the perforation portion is an alternating arrangement of perforation cut portions and non-perforation cut portions, and a ratio A expressed by the formula: [total length of the non-perforation cut portions/(total length of the perforation cut portions+total length of the non-perforation cut portions)×100] is 25% or more and 75% or less. The roll product package according to claim 2, wherein the length of each of the perforated cut portions is 1 mm or more and 10 mm or less, and the length of each of the non-perforated cut portions is 1 mm or more and 10 mm or less. The roll product packaging according to any one of claims 1 to 3, wherein the tear strength of the resin film is 0.2 N or more and 3.0 N or less. The roll product package according to any one of claims 1 to 4, wherein the thickness of the resin film is 20 μm or more and 50 μm or less. The roll product package according to any one of claims 1 to 5, which has a plurality of heat-sealed portions extending substantially parallel on the top and bottom surfaces, and the width of the non-heat-sealed portion located between one heat-sealed portion and another heat-sealed portion adjacent thereto is 1 mm or more and 16 mm or less. The roll product package according to claim 6, in which the ratio B, expressed by the formula: [(width of the heat-sealed portion)/(width of the heat-sealed portion+width of the non-heat-sealed portion) x 100], is 15% or more and 75% or less on the top and bottom surfaces. 8. The roll product package of claim 1, wherein the paper towel has a basis weight of 40 g/ ^m2 or more and 150 g/ ^m2 or less. The roll product package according to claim 1 , wherein the roll product has a roll density of 0.05 g/cm ³ or more and 0.16 g/cm ³ or less. The roll product package according to any one of claims 1 to 9, wherein the paper towel has a thickness of 200 μm or more and 1300 μm or less. The roll product package according to any one of claims 1 to 10, wherein the roll product has a winding diameter of 90 mmφ or more and 160 mmφ or less. 12. The roll product package according to claim 1, wherein a ratio C of the perimeter of the roll product to the inner perimeter of the roll product package , expressed by the formula: [(perimeter of the roll product/inner perimeter of the roll product package ) ×100], is 70% or more and 100% or less. 13. The roll product package according to claim 1, wherein the ratio D in the roll product package is expressed by the formula: [(perimeter of the roll product x roll density of the roll product / inner circumference of the roll product package ) x 100] is 5 or more and 16 or less.

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