US20220183514A1

US20220183514A1 - Film packaging tissue

Info

Publication number: US20220183514A1
Application number: US17/442,711
Authority: US
Inventors: Hirohiko Kato
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2019-03-29
Filing date: 2020-02-12
Publication date: 2022-06-16
Also published as: JP7307579B2; EP3950533A4; WO2020202807A1; CN113329952A; EP3950533A1; JP2020164227A

Abstract

To provide a film-packaged tissue excellent in extracting tissue paper from a take-out port.

The problem is solved by a film-packaged tissue having a pop-up type bundle of sheets of tissue paper packaged by a resin packaging film, in which the film-packaged tissue has: ring-shaped take-out port forming perforations formed in a bundle longitudinal direction on a top surface thereof; and a slit or a perforation that is continuous with or close to an edge of the take-out port forming perforations in the longitudinal direction, extends parallel to or in a direction away from a center line extending in a short direction at the center of the take-out port forming perforations in the longitudinal direction, and does not reach an edge of the top surface.

Description

TECHNICAL FIELD

The present invention relates to a film-packaged tissue in which a pop-up type bundle obtained by folding and stacking a plurality of sheets of tissue paper is packaged by a film.

BACKGROUND ART

A tissue product in which a pop-up type bundle of sheets of tissue paper is stored in a storage container includes a so-called box tissue in which a paper box is used for a storage container, and a film-packaged tissue in which a resin packaging film is used for a packaging container.
This film-packaged tissue has advantages that the storage container that becomes waste after use can be compact, and that portability and unit selling price can be reduced.
In the film-packaged tissue, a single straight line of take-out port forming perforations is formed at the center of a top surface of a packaging film serving as a storage container in the short direction along the maximum width of the longitudinal direction or a part of the width in the longitudinal direction, and the film-packaged tissue is used while a slit-shaped take-out port is formed by tearing of the perforations at the time of use (Patent Literature 1).
Then, at the time of use, a part of an uppermost sheet of the tissue paper of a bundle is exposed from the take-out port, and this exposed part is sequentially pulled out. In this way, the sheets of the tissue paper are used one by one.
However, the film-packaged tissue at such a linear slit-shaped take-out port may be lifted together with the packaging film when the tissue paper is pulled out, and cannot be pulled out smoothly in some cases because the packaging film is lighter than a paper box. Such a lifting phenomenon is likely to occur when the length of the slit is shorter than the length of the top surface in the longitudinal direction. Furthermore, it is difficult to take out the first sheet of paper from the slit-shaped take-out port.
Meanwhile, there is a product not having a slit-shaped take-out port but having a take-out port formed by die-cutting so as to have a certain width on a depth side (short direction). In such a product, an opening width of the take-out port is wide, and therefore the lifting phenomenon is less likely to occur, but when the number of included sheets of tissue paper is reduced and the height of the bundle is lowered, a phenomenon that a part of a sheet of the tissue paper is not exposed from the take-out port and falls inside is likely to occur.

CITATION LIST

Patent Literature

Patent Literature 1: JP 2018-52559 A
Patent Literature 2: JP 2018-58654 A

SUMMARY OF INVENTION

Technical Problem

Therefore, a main object of the present invention is to provide a film-packaged tissue in which tissue paper does not easily fall into a packaging container even if the height of an internal bundle is lowered, the packaging container is not easily lifted when a sheet of the tissue paper is pulled out from a take-out port, and a part of a sheet of the tissue paper next exposed from the take-out port is likely to stand up after a sheet of the tissue paper is pulled out from the take-out port.

Solution to Problem

Means for solving the above problems are as follows.
A first means is
a film-packaged tissue having a pop-up type bundle of sheets of tissue paper packaged by a resin packaging film, in which
the film-packaged tissue has:
ring-shaped take-out port forming perforations formed in a bundle longitudinal direction on a top surface thereof; and
a slit or a perforation that is continuous with or close to an edge of the take-out port forming perforations in the longitudinal direction, extends parallel to or in a direction away from a center line extending in a short direction at the center of the take-out port forming perforations in the longitudinal direction, and does not reach an edge of the top surface.
A second means is
the film-packaged tissue according to the first means, in which
the edge of the take-out port forming perforations in the longitudinal direction has a curved shape that bulges toward the center in the short direction, and a slit or a perforation is formed from the curved portion toward an outside of an area surrounded by the take-out port forming perforations.
A third means is
the film-packaged tissue according to the first or second means, in which two to five slits or perforations are formed on one edge.

Advantageous Effects of Invention

The present invention provides a film-packaged tissue in which tissue paper does not easily fall into a packaging container even if the height of an internal bundle is lowered, the packaging container is not easily lifted when a sheet of the tissue paper is pulled out from a take-out port, and a part of a sheet of the tissue paper next exposed from the take-out port is likely to stand up after a sheet of the tissue paper is pulled out from the take-out port.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a film-packaged tissue according to the present invention.

FIG. 2 is a perspective view for explaining a tissue paper bundle according to the present invention.

FIG. 3 is a plan view for explaining a take-out port of the film-packaged tissue according to the present invention.

FIG. 4 is a plan view for explaining another form of the take-out port of the film-packaged tissue according to the present invention.

FIG. 5 is a plan view for explaining a plurality of other forms of the take-out port of the film-packaged tissue according to the present invention.

FIG. 6 is a perspective view illustrating a mode of use of the take-out port of the film-packaged tissue according to the present invention.

FIG. 7 is a diagram for explaining an example of a method for manufacturing the film-packaged tissue according to the present invention.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7.
In a film-packaged tissue 1 according to the present invention, a tissue paper bundle 3 formed by folding and stacking a plurality of sets of tissue paper 2 is packaged by a flexible resin packaging film 4.
The tissue paper bundle 3 included in the film-packaged tissue 1 according to the present invention is obtained by folding a sheet of the tissue paper 2 in half, and folding and stacking a plurality of sheets of the tissue paper 2 such that folded pieces 2B of other sheets of the tissue paper 2 located above and below the folded sheet are located in an inner side 2A of the folded sheet. The tissue paper bundle 3 is a pop-up type tissue paper bundle in which when one folded piece of an uppermost sheet is lifted upward, a folded piece of another sheet adjacent to the lifted sheet immediately below is dragged upward and lifted.
This tissue paper bundle 3 can be manufactured by a known multi-stand type or rotary type interfolder. Note that each of sheets of the tissue paper 2 constituting the bundle 3 of the tissue paper 2 has a ply structure in which two to three thin sheets each having a crepe are stacked and assembled. This tissue paper 2 is a dry type, not a so-called wet type impregnated with a chemical solution.
On the other hand, the tissue paper bundle 3 according to the present invention has a substantially rectangular parallelepiped shape having a pair of longitudinal side surfaces 3B in which folded edges 2C of sheets of the tissue paper 2 are lined up, a pair of short side surfaces 3A in which the folded edges 2C are not lined up, and a pair of flat surfaces (upper and lower surfaces) 3C connected to the short side surfaces 3A and the longitudinal side surfaces 3B.
A packaging form of the film-packaged tissue 1 according to the present invention is selected from known packaging types. Examples thereof include three-sided closed packaging, four-sided closed packaging, gusset packaging, pillow packaging, and caramel packaging. Gusset packaging and pillow packaging are suitable, and the illustrated pillow packaging with gusset is particularly suitable. In particular, an effect of the present invention is remarkable when pillow packaging with gusset is used in which a heat-sealing portion 30 obtained by heat-sealing an overlapped portion of the packaging film is located at a position facing the short side surface 3A where the folded edges 2C of the tissue paper 2 are not lined up in the tissue paper bundle 3.
The film-packaged tissue 1 according to the present invention has ring-shaped take-out port forming perforations 5 formed in a bundle longitudinal direction 3 y on a top surface 10 facing an uppermost sheet of the tissue paper 2 of the bundle 3 of the packaging film 4. By tearing of the take-out port forming perforations 5, a take-out port 6 is formed on the top surface of the film-packaged tissue 1. In the film-packaged tissue 1 according to the present invention, since the tissue paper bundle 3 is a pop-up type, when an uppermost sheet of the tissue paper 2 of the bundle 3 is pulled out from thus formed take-out port 6, a part of a next sheet of the tissue paper located immediately below the pulled-out sheet is exposed from take-out port 6.
The take-out port forming perforations 5 according to the present invention have a ring shape formed by die cutting, and in particular, is elongated in the longitudinal direction 3 y of the bundle 3 which is an extending direction of the folded edge 2C of the tissue paper 2 at the center of the bundle 3 in a short direction 3 x, and has a length L2 shorter than a longitudinal length L1 of the bundle 3. Therefore, an area surrounded by the take-out port forming perforations 5 is removed by tearing of the take-out port forming perforations 5 to form the take-out port 6 having the same shape as the area surrounded by the take-out port forming perforations 5. Note that other perforations may be formed within the area surrounded by the ring-shaped take-out port forming perforations such that the area can be easily removed.
The size of the area surrounded by the take-out port forming perforations 5 is not necessarily limited, but is generally 5 to 25 mm in the short direction 3 x of the bundle 3 and 100 to 150 mm in the longitudinal direction 3 y of the bundle 3. A cut-tie ratio of the take-out port forming perforations is not particularly limited. The cut-tie ratio can be appropriately set to a range in which the film can be easily cut off considering the material and thickness of the film.
Characteristically, the film-packaged tissue 1 according to the present invention has slits 50, 50 . . . that are continuous with or close to edges 5E and 5E of the take-out port forming perforations 5 in the longitudinal direction, extend parallel to or in a direction away from a center line C extending in a short direction at the center of the take-out port forming perforations 5 in the longitudinal direction, and do not reach edges of the top surface 10.
A perforation in which a slit is formed by tearing may be formed instead of the slit. In a case of the slit, if the slit is continuous with the edge 5E of the take-out port forming perforations in the longitudinal direction, preferably, an end of the slit is continuous with a tie part and is not continuous with a cut part in the cut part and the tie part of the perforations. In this way, a risk that the slit is formed only by removing the area surrounded by the take-out port forming perforations 5 is reduced. Further, a risk that when the area surrounded by the take-out port forming perforations 5 is removed, the slit may be unintentionally torn, is reduced. In a case of a perforation or in a case where a slit is formed close to the edge, when the area surrounded by the take-out port forming perforations 5 is removed, there is an advantage that the slit is less likely to be unintentionally torn.
When the slit or the like 50 is formed in this way, soft and flexible small edge pieces 6B and 6B are formed in edges 6 y and 6 y of the take-out port 6 in the longitudinal direction while the area surrounded by the take-out port forming perforations 5 is removed by tearing of the take-out port forming perforations 5.
In the film-packaged tissue 1 according to the present invention, such small edge pieces 6B and 6B are formed. Therefore, when the tissue paper 2 is pulled out from the take-out port 6, a slit 6A between the small edge pieces 6B and 6B widens to reduce pull-out resistance, the tissue paper 2 can be pulled out smoothly, and the tissue paper 2 is less likely to be lifted together with the packaging film 4 at the time of pull-out. At the same time, an edge 2E of a sheet of the tissue paper 2 that is next pulled out from the take-out port 6 and exposed is inserted into the slit 6A and held, or, for example, the small edge pieces 6B and 6B act on the sheet of the tissue paper 2 like check valves. As a result, in particular, as illustrated in FIG. 5, the small edge pieces 6B and 6B lean against the edges 2E and 2E of the sheet of the tissue paper 2 and hold the sheet of the tissue paper 2, a part of the sheet of the tissue paper 2 is likely to stand up, the standing part is easily grasped at the time of next use, and the sheet of the tissue paper 2 is less likely to fall into the packaging film 4. The length of the slit or the like 50 is 2 to 20 mm, preferably 3 to 10 mm, and particularly preferably 3 to 6 mm. When the length is less than 2 mm, support by the small edge piece 6B and opening of the slit 6A may be insufficient, and reduction of the pull-out resistance of the tissue paper and support of the tissue paper 2 may be performed insufficiently. When the length exceeds 20 mm, a risk that the tissue paper 2 may be insufficiently supported increases.
It is desirable that the number of the slits or the like 50 is 2 to 5 for one edge 5E. Three to six small edge pieces 6B are formed, and a space between the slits 6A can be widened according to a complicated shape change of the tissue paper when the tissue paper 2 is pulled out from the take-out port 6. Therefore, the tissue paper 2 can be pulled out more smoothly. In addition, it is easy to correspond to the shape of the edge 2E of a next sheet of the tissue paper 2 that is pulled out from the take-out port 6 and exposed, and it is easy to support the tissue paper 2. When the number of the slits or the like 50 exceeds 5, a risk that the packaging film 4 may be unintentionally torn increases. If two to five slits or the like are formed as described above, it is desirable that the slits are symmetrical with respect to the center in the short direction, or are evenly spaced and radial. An edge of the tissue paper 2 is easily supported evenly, and standing performance of the tissue paper is enhanced.
Here, the specific shape of the take-out port forming perforations 5 is not necessarily limited, but examples thereof include an elliptical shape, an elongated rectangle, and an elongated rectangle with a rounded corner. As a preferable form, the edges 5E and 5E of the take-out port forming perforations 5 in the longitudinal direction preferably each have a curved shape that bulges toward the center in the short direction, such as a semicircle. The form illustrated in FIG. 1 has a curved shape in which a space between ends of one pair of perforations 5A and 5A parallel to the longitudinal direction and separated at predetermined intervals bulges toward the center of a semicircle in the short direction. Furthermore, the pair of perforations 5A and 5A parallel to the longitudinal direction in FIG. 3 may gradually bulge toward the center in the short direction. In this case, the take-out port 6 has the shape illustrated in FIG. 4. In a case where the edges 5E and 5E in the longitudinal direction each have a curved shape as described above, it is desirable that the slit or the like 50 is formed from the curved portion toward an outside of an area surrounded by the take-out port forming perforations 5.
As described above, in a case where the edges 5E and 5E in the longitudinal direction each have a curved shape that bulges toward the center in the short direction, when an uppermost sheet of the tissue paper 2 of the bundle 3 is pulled out from the take-out port 6, in a process of pulling out a part of a next sheet of the tissue paper 2 located immediately below the pulled-out sheet from the port, the side edge portions 2E and 2E of the sheet of the tissue paper 2 to be pulled out in the bundle longitudinal direction are easily moved so as to be rolled up along the bulging shape. As a result, a part of the sheet of the tissue paper 2 exposed from the take-out port 6 is likely to form a substantially tubular portion on both side portions 2E and 2E in the longitudinal direction as illustrated in FIG. 6, is likely to become a self-supporting form having this substantially tubular portion as a pillar structure, the standing part is easily grasped, and a falling prevention property is enhanced.
Here, it is desirable that a range of the length L2 of the take-out port forming perforations 5 according to the present invention in the longitudinal direction is 80% to 90%, and more preferably 84% to 88% of the longitudinal length L1 of the bundle 3. Within this range, after a sheet of the tissue paper is pulled out from the take-out port 6, an edge of a sheet of the tissue paper 2 next exposed from the take-out port 6 is easily supported by an edge of the take-out port in the longitudinal direction to enhance a falling prevention property and to prevent an excessive increase in resistance when the sheet of the tissue paper is pulled out from the take-out port 6.
Examples of a specific flexible resin film material constituting the packaging film 4 according to the present invention include: a single-layer film of a polyethylene film, a polypropylene film, a polyester film, a polyethylene terephthalate film, a nylon film, a vinylidene chloride film, or an ethylene vinyl alcohol copolymer; a laminate film obtained by appropriately stacking these films; and a gas barrier film obtained by subjecting any of these films to a surface treatment such as aluminum vapor deposition. A polypropylene film and a polyethylene film are preferable from a viewpoint of cost. It is desirable that the film material has a thickness of 20 to 60 μm. A slit is easily opened, the tissue paper can be pulled out smoothly, and the small edge piece 6B can preferably support the tissue paper 2. Note that when the thickness is less than 20 μm, the film is easily torn during use disadvantageously, and when the thickness is 60 μm or more, the film is hard, and usability thereof deteriorates. Note that the thickness of the film material is a value measured using a dial thickness gauge (thickness measuring instrument) “PEACOCK G-1A type” (manufactured by Ozaki MFG. Co. Ltd.) in the standard state. As a specific measurement procedure, it is confirmed that there is no rubbish, dust, or the like between a plunger and a measuring table, the plunger is placed on the measuring table, a scale of the dial thickness gauge is moved to adjust a zero point, then the plunger is raised, a sample is placed on a test table, the plunger is lowered slowly, and the current gauge is read. At this time, the plunger is just placed. The thickness is an average of values obtained by performing the measurement 10 times.
It is desirable that the physical properties of the tissue paper bundle 3 and the tissue paper 2 in the film-packaged tissue 1 according to the present invention are as follows. Even if there is the small edge piece 6B, the tissue paper can be pulled out smoothly, and the small edge piece 6B can preferably support the tissue paper 2 easily.
It is desirable that the number of plies and the number of sets of the tissue paper 2 constituting the tissue paper bundle 3 is 100 to 220 sets with 2 plies (two sheets stacked) as one set. It is desirable that the tissue paper bundle 3 has a shape of 30 to 50 mm in height, 155 to 215 mm in length in the longitudinal direction, and 100 to 130 mm in length in the short direction. The number of sets sufficiently required for a tissue paper product can be achieved, the size and number of sets to be sufficiently used as the tissue paper 2 can be achieved, and the tissue paper 2 is extremely unlikely to fall even if the number of sets forming the bundle is reduced by use.
It is desirable that the tissue paper bundle 3 is manufactured by a rotary type interfolder. When a bundle is manufactured by a rotary interfolder, the short direction of the bundle coincides with MD (Machine Direction) of the tissue paper. That is, when a part of a sheet of the tissue paper exposed from the take-out port stands up, MD with high paper strength becomes an up-down direction. Therefore, the part of the sheet of the tissue paper can be easily maintained in a self-supporting state, and falling is easily prevented.
The tissue paper 2 according to the present invention may be a chemical solution-imparted type to which a moisturizer or the like is imparted. However, it is desirable that the present invention is the non-moisturizing general-purpose type tissue paper 2 to which a moisturizer or the like is not particularly applied because the non-moisturizing general-purpose type tissue paper 2 easily becomes self-supporting.
It is desirable that the basis weight per thin sheet constituting each ply of the tissue paper 2 is 10.0 to 15.0 g/m². The basis weight here is measured by the measurement method of JIS P 8124 (1998). It is desirable that the specific paper thickness of a set of the tissue paper is within a range of 80 to 200 μm from a viewpoint of usability as the tissue paper.
A method for measuring the paper thickness is a value obtained by sufficiently subjecting tissue paper to humidity control under conditions of JIS P 8111 (1998), and then measuring the paper thickness in using a dial thickness gauge (thickness measuring instrument) “PEACOCK G type” (manufactured by Ozaki MFG. Co. Ltd.) under the same conditions. As a specific measurement procedure, it is confirmed that there is no rubbish, dust, or the like between a plunger and a measuring table, the plunger is placed on the measuring table, a scale of the dial thickness gauge is moved to adjust a zero point, then the plunger is raised, a sample is placed on a test table, the plunger is lowered slowly, and the current gauge is read. At this time, the plunger is just placed. A terminal of the plunger is made of metal, and a circular flat surface thereof with a diameter of 10 mm strikes perpendicularly to a paper flat surface, and a load is about 70 gf in a case of 120 μm when the thickness is measured. Note that the thickness is an average of values obtained by performing the measurement 10 times. Within the above ranges of basis weight and paper thickness, even if there is the small edge piece 6B, the tissue paper can be pulled out smoothly, and the small edge piece can preferably support the tissue paper easily.
As for the paper strength of the tissue paper 2, it is desirable that dry paper strength in MD is 200 to 700 cN/25 mm and dry paper strength in CD is 50 to 300 cN/25 mm. Note that the paper strength can be achieved by adjusting a papermaking raw material, such as adding a paper strength agent during papermaking. It is desirable that the tissue paper has an elongation ratio (tensile elongation ratio at break) of 5 to 20% in MD. Even if there is the small edge piece, the tissue paper can be pulled out smoothly, and the small edge piece can preferably support the tissue paper easily.
It is desirable that the tissue paper 2 has Softness of 0.90 to 1.30 cN/100 mm. Softness is one of indicators of softness. Softness according to the present invention is measured by a handle-o-meter method according to the JIS L 1096 E method. However, a test piece has a size of 100 mm×100 mm, and measurement is performed with a clearance of 5 mm. A 1-ply product is measured five times in each of MD and CD, and an average of the total 10 values is defined as Softness in units of cN/100 mm. Within this Softness range, the tissue paper can be pulled out smoothly.
It is desirable that the tissue paper 2 has MMD of 7.5 to 9.0. MMD is an indicator of smoothness. Within the above MMD range, slipperiness with the packaging film is moderate, and within this Softness range, the tissue paper is easily guided by a guide edge. Note that MMD is a value measured using friction testers KES-SE and KES-SESRU manufactured by Kato Tech Co., Ltd. and their equivalent machines. MMD is the degree of fluctuation indicating how much a coefficient of friction fluctuates from an average coefficient of friction (MIU), and the smaller a numerical value is, the smoother a surface is. As for a measurement condition according to the present invention, while a contact surface of a friction element is brought into contact with a surface of a measurement sample to which a tension of 20 g/cm is applied in a predetermined direction at a contact pressure of 25 g, the measurement sample is moved by 2 cm in substantially the same direction as the direction in which the tension is applied at a speed of 0.1 cm/s. The measurement is performed 10 times, and an average value thereof is defined as MMD. Note that as the friction element, a piano wire sensor attached as standard is used. The piano wire sensor is formed by adjoining 20 piano wires each having a diameter of 0.5 mm, and has a contact surface formed such that the length and the width are both 10 mm. On the contact surface, a unit bulging portion having a tip formed of 20 piano wires (radius of curvature: 0.25 mm) is formed.
Note that raw material pulp for a thin sheet constituting the tissue paper 2 is obtained by blending softwood-derived pulp such as NBKP, NUKP, or NOKP with hardwood-derived pulp such as LBKP, LUKP, or LOKP. The tissue paper 2 may include used paper pulp, but preferably include only NBKP and LBKP in terms of texture and the like. A blend ratio thereof is preferably NBKP:LBKP=10:90 to 80:20, and particularly preferably NBKP:LBKP=20:80 to 60:40.
The film-packaged tissue 1 according to the present invention can be manufactured particularly as illustrated in FIG. 7. First, a sheet of the tissue paper 2 is folded in half by an interfolder such as a multi-stand type or a rotary type. A plurality of sheets of the tissue paper 2 is folded and stacked such that the folded pieces 2B of other sheets of the tissue paper 2 located above and below the folded sheet are located in the inner side 2A of the folded sheet to form the pop-up type tissue paper bundle 3 having a substantially rectangular parallelepiped shape.
Next, the tissue paper bundle 3 is conveyed with the short side surfaces 3A where the folded edges 2C of the tissue paper 2 are not lined up in a front-back direction. This conveyance can be performed by a belt conveyor or the like. At the same time, a continuous packaging film 14 is unwound from a film original roll 40 around which the continuous long packaging film 14 is wound. On the conveyed continuous packaging film 14, a die-cut roll 16 forms the take-out port forming perforations 5 and the slit or the like 50 serving as a take-out port forming portion of the tissue paper 2 at regular intervals. As for the shapes of the take-out port forming perforations 5 and the slit or the like 50, the pattern of a cutter blade on a peripheral surface of the die-cut roll only needs to be appropriately formed. Note that although not illustrated, the take-out port forming perforations 5 and the slit or the like 50 may be formed by using stopping and going for conveyance of the continuous packaging film instead of the die-cut roll 16 and pressing a die-cut plate at the time of stop.
Next, the conveyance direction of the tissue paper bundle 3 is caused to coincide with the conveyance direction of the continuous packaging film 14. While the tissue paper bundle 3 is being conveyed, the tissue paper bundle 3 is located on a lower side of the take-out port forming perforations 5 of the continuous packaging film, and the tissue paper bundle 3 is wrapped with an edge of the continuous packaging film 14, and heat-sealed at a position facing the short side surface 3A of the tissue paper bundle 3. At the same time as the heat-sealing or thereafter, the resulting product is cut into individual packages (packaging step). A gusset may be formed on the longitudinal side surface 3B side of the tissue paper bundle 3 at the time of heat-sealing to form a pillow packaging with the gusset.

Examples

Next, for each of the film-packaged tissue according to the present invention and a film-packaged tissue as a comparative example, an included sheet of tissue paper was pulled out and tested for its take-out resistance value, film floating, and falling. Note that in examples, the same structure of tissue paper, the same structure of a bundle, and the same packaging form with a packaging film were used, and only arrangement forms of a take-out port and a slit were different between the examples. The arrangement forms of the take-out port and the slit are illustrated in FIG. 5(A) for Example 1, FIG. 5(B) for Example 2, FIG. 5(C) for Example 3, FIG. 5(D) for Example 4, FIG. 5(E) for Example 5, and FIG. 5(F) for Example 6. In Comparative Example 1, perforations were formed not into a ring shape but into a single straight line to form a slit-shaped take-out port. In Comparative Example 2, a slit was not formed in FIG. 5(A). More specifically, the form of the film-packaged tissue, the dimensions of the take-out port, the shape and physical properties of the included tissue paper bundle, the physical properties of the packaging film, and the like according to each of the examples are illustrated in Table 1 below together with results.
A take-out resistance value was measured by the following procedures (1) to (3).
(1) A longitudinal central tip of a part of tissue paper exposed from a take-out port is pinched with a clip (manufactured by KOKUYO Co., Ltd., bulldog clip KURI-17) and fixed.
(2) A hook of a push-pull gauge (manufactured by Imada Co., Ltd., model number Z2-20) is caused to pass through one hole of the clip, the push-pull gauge is pulled vertically upward, and the tissue is pulled out and taken out in 0.4 to 0.6 seconds. A maximum resistance value during the take-out operation is measured.
(3) An average value for the first to fifth sets from the uppermost layer of the bundle and an average value for the sixth to tenth sets from the uppermost layer of the bundle are calculated.
For film floating, an operation of pulling out a sheet of the tissue paper constituting the bundle was continuously performed, and the number of sets from an upper part of the bundle when the tissue paper floated together with the packaging film was measured.
For falling, an operation of pulling out a sheet of the tissue paper constituting the bundle was continuously performed, and the number of sets from an upper part of the bundle when a part of a sheet of the tissue paper next to the pulled-out sheet of the tissue paper was not exposed from the take-out port and fell inside was measured.

TABLE 1

			Example 1	Example 2	Example 3	Example 3	Example 4

Dimensions	Width (length in longitudinal	mm	179	179	179	179	179
of bundle	direction)
	Depth (length in short	mm	100	100	100	100	100
	direction)
	Number of sets	Set	160	160	160	160	160
Take-out	Width (length in longitudinal	mm	135	135	135	135	135
port	direction)
	Depth (length in short	mm	15	15	15	15	15
	direction)
	Shape of end	—	Approximately	Approximately	Approximately	Approximately	Approximately
			semicircular	semicircular	semicircular	semicircular	semicircular
	Direction of slit	—	Radial	Radial	Radial	Radial	Radial
	Number of slits	Slit	1	2	3	3	3
	Length of slit	mm	5	5	5	3	10
Film	Material	—	PP with satin	PP with satin	PP with satin	PP with satin	PP with satin
			finished	finished	finished	finished	finished
			surface	surface	surface	surface	surface
	Film thickness	μm	60	60	60	60	60

Test result	Take-out	First set	gf	105	72	115	80	87
	resistance value	Fifth set	gf	121	84	107	67	80
		Tenth set	gf	74	76	74	50	50
		25^thset	gf	44	51	55	27	30
		50^thset	gf	29	30	35	32	14
		100^thset	gf	17	15	15	10	17

Number of sets in which film	159	None	None	159	None
floating occurred
Number of sets in which falling	None	None	None	None	130
occurred

		Comparative	Comparative
Example 5	Example 6	Example 1	Example 2

Dimensions	Width (length in longitudinal	mm	179	179	179	179
of bundle	direction)
	Depth (length in short	mm	100	100	100	100
	direction)
	Number of sets	Set	160	160	160	160
Take-out	Width (length in longitudinal	mm	135	135	135	135
port	direction)
	Depth (length in short	mm	15	15	—	15
	direction)
	Shape of end	—	Approximately	Approximately	—	Approximately
			semicircular	semicircular		semicircular
	Direction of slit	—	Radial	Horizontal	—	No slit
	Number of slits	Slit	5	3	—	—
	Length of slit	mm	5	5	—	—
Film	Material	—	PP with satin	PP with satin	PP with satin	PP with satin
			finished	finished	finished	finished
			surface	surface	surface	surface
	Film thickness	μm	60	60	60	60

Take-out	First set	gf	61	67	164	141
resistance value	Fifth set	gf	56	56	87	104
	Tenth set	gf	68	34	93	108
	25^thset	gf	30	22	75	56
	50^thset	gf	23	15	56	28
	100^thset	gf	8	16	37	28

Number of sets in which film	None	None	138	147
floating occurred
Number of sets in which falling	None	None	None	None
occurred

As illustrated in Table 1, in both Examples and Comparative Examples, the length of the take-out port in the longitudinal direction (described as the width of the take-out port in Table) is uniformly 135 mm, and the length of the bundle in the longitudinal direction (described as the width in the bundle dimensions in Table) is uniformly 179 mm. The width of the take-out port in the longitudinal direction is shorter than the length of the bundle in the longitudinal direction. However, in Examples 1 to 6 of the present invention, film floating occurred only in the number of sets much closer to a bottom side than in Comparative Examples. Regarding falling, in Example 4 in which the length of the slit is 10 mm, which is long, falling is observed in the last set of the 159th set, but it can be said that falling is extremely unlikely to occur. In particular, despite the low pull-out resistance of the tissue paper, falling is unlikely to occur. Note that for the shapes of the take-out ports in Comparative Examples 1 and 2, when the take-out port has almost the same longitudinal length as the length between slit ends located on the most longitudinal end side in Example 4 (135 m+10 m+10 m=155 mm) in Table, it is indicated that falling occurs earlier than in Example 4.
As described above, in the film-packaged tissue according to the present invention, a small edge piece formed by a slit or the like functions, tissue paper does not easily fall into a packaging container even if the height of an internal bundle is lowered, the packaging container is not easily lifted when a sheet of the tissue paper is pulled out from a take-out port, and a part of a sheet of the tissue paper next exposed from the take-out port is likely to stand up after a sheet of the tissue paper is pulled out from the take-out port.

REFERENCE SIGNS LIST

1 Film-packaged tissue
2 Tissue paper
2E Edge of tissue paper
3 Tissue paper bundle
2A Inner side of folded sheet
2B Folded piece
4 Packaging film
10 Top surface
2C Folded edge
3A Short side surface
3B Longitudinal side surface
3C Flat surfaces (upper and lower surfaces)
30 Heat-sealing portion
5 Take-out port forming perforations
5E Edge of take-out port forming perforations in longitudinal direction
50 Slit or perforation
6 Take-out port
6A Slit between small edge pieces
6B Small edge piece
6 y Edge of take-out port in longitudinal direction
C Center line
3 x Short direction of bundle
3 y Longitudinal direction of bundle
L1 Length of bundle in longitudinal direction
L2 Length of take-out port forming perforations in bundle longitudinal direction
L3 Width of bundle in short direction
L4 Height of bundle
14 Continuous packaging film
40 Film original roll
16 Die-cut roll

Claims

1. A film-packaged tissue, comprising:

a resin packaging film; and

a pop-up type bundle of sheets of tissue paper packaged by the resin packaging film,

wherein the film-packaged tissue has:

ring-shaped take-out port forming perforations formed in a bundle longitudinal direction on a top surface thereof; and

a slit or a perforation that is continuous with or close to an edge of the take-out port forming perforations in the longitudinal direction, extends parallel to or in a direction away from a center line extending in a short direction at a center of the take-out port forming perforations in the longitudinal direction, and does not reach an edge of the top surface.

2. The film-packaged tissue according to claim 1,

wherein the edge of the take-out port forming perforations in the longitudinal direction has a curved shape that bulges toward a center in the short direction, and a slit or a perforation is formed from the curved portion toward an outside of an area surrounded by the take-out port forming perforations.

3. The film-packaged tissue according to claim 1,

wherein two to five slits or perforations are formed on one edge.