Package for paper product

Abstract

To provide a package for a paper product which prevents collapse of a content of an object to be packaged, facilitates portability, and facilitates opening of a perforation during usage, even in a case where a paper product, especially, a paper product such as thin paper is formed into the object to be packaged.SOLUTION: There is provided a package in which a paper product is covered with a film packaging base material and the package is sealed by seal parts, wherein the film packaging base material has a basis weight of 20 g / m2 or more and 110 g / m2 or less and a thickness of 20 μm or more and 120 μm or less, the seal parts are provided on both ends of mountain folds, (B / A×100(%)) is 65% or more and 175% or less when an interval between the mountain folds of the film packaging base material is defined as A and a length of the paper product is defined as B, the paper product is a laminate in which 200 sets or more and 270 sets or less of two-or-more-ply tissue paper are stacked, a take-out port of perforations has a bond ratio of 5% or more and 60% or less, and ((length of perforation÷length on side parallel to mounting ruled line of paper product)×100(%)) is 40% or more and 90% or less.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a package for paper products, particularly suitable for packaging paper products such as tissue paper.

Background Art

[0002] Conventionally, packages for accommodating roll-shaped paper products such as toilet paper and kitchen paper, and laminated paper products such as tissue paper and wipes as objects to be packaged are known.

[0003] As a package for packaging roll-shaped paper products, for example, Patent Document 1 discloses a package in which a gusset is symmetrically folded into a cylindrical film such as polyethylene to form a main body, and the upper part thereof is folded flat to form a gripping part.

[0004] On the other hand, as a package for packaging laminated paper products, a paper carton made of thick paperboard is generally used. Further, as a package alternative to a paper carton, for example, Patent Document 2 discloses a film package in which a perforation is provided at the center of the upper surface of a packaging bag formed of a flexible resin film.

[0005] However, when the package is a resin film, although it has flexibility, generally, its shape is easily deformed. When packaging, sealing, transporting, and using the paper product as the object to be packaged, especially when there is an external load, it tends to affect the state of the paper product in the package.

[0006] For example, if the film is thickened to maintain the packaging form, it becomes difficult to make a perforation, and it is necessary to apply a strong force to open and use it. Then, the packaging base material is torn or deformed by elongation, and the shape of the package is greatly deformed. As a result, the paper product as the object to be packaged is also deformed, and it is difficult to take out when taken out from the package for use, and it may not be suitable for use. Further, if the object to be packaged is a soft lotion tissue, it is desired that it does not deform even when pressed with a strong force because the object to be packaged may deform and be difficult to carry when carrying it, unless the package is pressed with a strong force.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been made in view of such circumstances, and even when a paper product, particularly a paper product such as tissue paper, is used as the object to be packaged, it is an object of the present invention to provide a packaging body for paper products in which the contents of the object to be packaged are difficult to collapse (easy to take out), easy to carry, and the perforations are easy to open during use.

Means for Solving the Problems

[0009] The inventor has conducted intensive studies and found that in a packaging body for a paper product in which a paper product is covered with a film packaging base material having four mountain fold portions extending in four substantially parallel one - direction, and the paper product is sealed by a seal portion, all of the mountain fold portions have ruled lines, the film packaging base material has a basis weight and a thickness within a predetermined numerical range, the ratio of the interval between the mountain fold portions in a direction orthogonal to the linear direction of the seal portion at the center of the mountain fold portion of the film packaging base material and the length in a direction orthogonal to both the linear direction of the seal portion and the linear direction of the mountain fold portion in the paper product is defined within a predetermined numerical range, the number of sets of paper products and the height of the packaging body are respectively defined within a predetermined numerical range, and further, by defining the bond ratio and ratio of the linear perforations for the take - out opening provided on the top surface of the packaging body within a predetermined numerical range, it has been found that the above problems can be solved, and the present invention has been completed. That is, the present invention provides the following.

[0010] (1) The first aspect of the present invention is a package for a paper product, in which a paper product is covered with a film packaging substrate having four mountain folds extending in four substantially parallel one directions, and the paper product is sealed by a seal portion. Each of the mountain folds has a ruled line, and the film packaging substrate has a basis weight of 20 g / m 2 or more and 110 g / m 2 or less, a thickness of 20 μm or more and 120 μm or less. The seal portions are respectively provided at both ends of the mountain folds, and are each formed as a substantially straight line orthogonal to the direction of the mountain folds and substantially parallel. The distance between the mountain folds in the direction orthogonal to the straight line direction of the seal portion at the center of the mountain folds of the film packaging substrate is defined as A, and the length of the paper product in the direction orthogonal to both the straight line direction of the seal portion and the straight line direction of the mountain folds in the paper product is defined as B. When the ratio (B / A×100 (%)) of B to A is 65% or more and 175% or less, the paper product is a tissue paper laminate obtained by laminating 200 sets or more and 270 sets or less of 2-ply or more tissue paper. At least one or more linear perforation outlets parallel to the mountain fold ruled lines are provided on the top surface of the package. The perforations have a bonding ratio of 5% or more and 60% or less, and the ratio defined by ((length of the perforation÷length of the paper product parallel to the mountain fold ruled line)×100 (%)) is 40% or more and 90% or less. This is a package for a paper product characterized by the above.

[0011] (2) The second aspect of the present invention is the package for a paper product according to (1), characterized in that the longitudinal tear strength of the film packaging substrate is 3 N or more and 19 N or less.

[0012] (3) The third aspect of the present invention is the package for a paper product according to (2), characterized in that the transverse tear strength of the film packaging substrate is 5 N or more and 27 N or less.

[0013] (4) The fourth aspect of the present invention is the package for a paper product according to (3), characterized in that the longitudinal tensile strength of the film packaging substrate is 7 N or more and 39 N or less.

[0014] (5) The fifth aspect of the present invention is the packaging body for paper products according to (4), characterized in that the transverse tensile strength of the film packaging base material is 5 N or more and 30 N or less.

[0015] (6) The sixth aspect of the present invention is the packaging body for paper products according to (5), characterized in that the film packaging base material is a tubular film.

[0016] (7) The seventh aspect of the present invention is the packaging body for paper products according to (5), characterized in that the packaging form by the film packaging base material is a gusset packaging.

Advantages of the Invention

[0017] According to the present invention, even when paper products, particularly paper products such as tissue paper, are used as the object to be packaged, it is possible to provide a packaging body for paper products in which the contents of the object to be packaged are difficult to collapse (easy to take out), easy to carry, and the perforations are easy to open during use.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0019] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. However, these are presented for illustrative purposes and do not limit the present invention. Note that the MD direction in the specification means the manufacturing line direction (conveying direction) during the manufacture of the paper product package, and is also referred to as the longitudinal direction. On the other hand, the CD direction means the direction perpendicular to the manufacturing line direction, and is also referred to as the transverse direction.

[0020] <Paper product package> FIGS. 1 and 2 are perspective views showing an example of the process of taking out the paper product package 1 (hereinafter also simply referred to as "package") and the paper product 11 of the present invention. The package 1 of the present invention is covered with a film packaging base material 10, for example, a paper product 11 laminated with lotion tissue paper 21, and the paper product 11 is sealed by a seal portion 13. The seal portion 13 is preferably provided at an end where the film packaging base materials 10 overlap. In addition, the package 1 is provided with a take-out port 15 for taking out the paper product 11. This take-out port 15 is provided by forming a perforation cut line 14 in the film packaging base material 10 so that the cut line can be cut and opened during use. The shape of the cut line is preferably a single perforation line.

[0021] (Seal portion) The seal portion 13 is preferably formed in a substantially straight line at a location about 10 mm from each end of the package 1 and such that each seal portion 13 is substantially parallel. However, as long as the sealing property (adhesiveness of the seal portion 13) of the package 1 can be ensured, it may be formed at other locations. When sealing with the seal portion 13, it is desirable to seal by heat sealing. Also, for heat sealing, it is not necessary to seal the entire seal portion 13, and a part may not be heat sealed.

[0022] (Valley fold portion) The four valley fold portions 12 extending in a substantially parallel one direction all have ruled lines, and folds are made along the ruled lines. The length of each ruled line may be a part of the valley fold portion 12, preferably 40% or more, more preferably 60% or more, and still more preferably 80% or more. In the package 1, in FIG. 1, the film packaging base material 10 covers the entire paper product 11, but it may cover only a part instead of the whole (not shown).

[0023] (Height A of the package) When the distance between the mountain folds 12 in the direction orthogonal to the linear direction of the seal part 13 at the center of the mountain fold part 12 is defined as A (see Fig. 3), the lower limit value of A is preferably 50 mm or more, more preferably 55 mm or more, and still more preferably 60 mm or more. On the other hand, the upper limit value of A is preferably 100 mm or less, more preferably 95 mm or less, and still more preferably 90 mm or less. If A is less than 50 mm, it becomes difficult to firmly hold the package 1 by applying force, and if it exceeds 100 mm, it becomes difficult to hold the package 1 because it is difficult to grasp by hand.

[0024] (Height B of the paper product) When the length of the paper product 11 in the direction orthogonal to both the linear direction of the seal part 13 and the linear direction of the mountain fold part 12 in the paper product 11 is defined as B (see Fig. 3), the lower limit value of B is preferably 5 mm or more, more preferably 10 mm or more, and still more preferably 20 mm or more. On the other hand, the upper limit value of B is preferably 200 mm or less, more preferably 100 mm or less, and still more preferably 60 mm or less.

[0025] (Dimension ratio: B / A×100) The ratio of B to A (B / A×100 (%)) is 65% or more and 175% or less. If this ratio is less than 65%, the paper product 11 is too little with respect to the height A of the package 1, so it is difficult to take out, for example, the lotion tissue paper 21 without putting a finger inside the package 1, and it is also difficult to firmly hold the package 1. If this ratio exceeds 175%, the paper product 11 is too much with respect to the height A of the package 1, so for example, the lotion tissue paper 21 is torn and difficult to take out, and the shape of the package 1 is deformed and difficult to hold. Incidentally, the lower limit value of the ratio of B to A (B / A×100 (%)) is preferably 75% or more, more preferably 85% or more. On the other hand, the upper limit value is preferably 145% or less, more preferably 120% or less.

[0026] As a method for measuring A, in the package 1 shown in Fig. 3, the distance between the upper surface mountain fold and the bottom surface mountain fold in the direction orthogonal to the linear direction of the seal portion 13 at the center of the mountain fold portion 12 is measured, and the average thereof is defined as A. At the time of measurement, the paper product 11 is taken out from the package 1, and with the film packaging base material 10 cut and stretched, it is measured with a ruler.

[0027] As a method for measuring B, in the paper product 11 shown in Fig. 3, the length of the paper product 11 in the direction orthogonal to both the linear direction of the seal portion 13 and the linear direction of the mountain fold portion 12 is measured, and the average thereof is defined as B. At the time of measurement, the sample paper product 11 is placed on a horizontal table, a 15 cm ruler is placed parallel to the short direction at the longitudinal center of the paper product 11, and it is measured by standing it vertically on the horizontal table so that the ruler is orthogonal to the 15 cm ruler (ruler, stainless steel, 15 cm, red numerals, JIS, 10 g).

[0028] (Take-out opening and perforation) In order for the package 1 to be provided with a take-out opening 15 for taking out, for example, the lotion tissue paper 21, at least one or more linear perforations 14 parallel to the mountain fold grid lines are provided on the top surface of the package 1.

[0029] The perforation 14 is preferably provided so as to be disposed above the central portion of the paper product 11. This take-out opening 15 is formed by cutting and opening the perforation 14 during use. As shown in Fig. 2, by sequentially pulling out (taking out) the lotion tissue paper 21 from the formed take-out opening 15, the required number of sheets of the lotion tissue paper 21 can be obtained.

[0030] (Shape of the perforation) The shape of the perforation 14 is linear. If it is linear, when opening the perforation, force can be applied evenly, so it is easy to open. On the other hand, when it is not linear, it is difficult to apply force evenly, so it becomes difficult to open the perforation 14.

[0031] (Length of the perforation) The lower limit of the overall length of the stitch 14 is preferably 40 mm or more, more preferably 50 mm or more, and still more preferably 60 mm or more. Also, the upper limit is preferably 180 mm or less, more preferably 160 mm or less, and still more preferably 140 mm or less. Note that the length direction of the single-line stitch 14 is preferably parallel to the MD direction of the film packaging base material 10.

[0032] (Length of the connecting part of the stitch) The length of the connecting part of the stitch 14 (also referred to as the tie length) preferably has a lower limit of 0.2 mm or more, more preferably 0.3 mm or more, and still more preferably 0.5 mm or more. On the other hand, the upper limit is preferably 3.0 mm or less, more preferably 2.0 mm or less, and still more preferably 1.0 mm or less. If the length of the connecting part of the stitch 14 is less than 0.2 mm, the film packaging base material 10 is likely to tear to a place other than the stitch 14 when the stitch 14 is opened, making it difficult to open the stitch 14. If the length of the connecting part of the stitch 14 exceeds 3.0 mm, it becomes difficult to open the stitch 14.

[0033] (Length of the cutting line of the stitch) The length of the cutting line of the stitch 14 (also referred to as the cut length) is preferably 0.5 mm or more, more preferably 0.7 mm or more, and still more preferably 1.0 mm or more. The upper limit is preferably 4.5 mm or less, more preferably 3.5 mm or less, and still more preferably 2.5 mm or less. If the length of the cutting line of the stitch 14 is less than 0.5 mm, it becomes difficult to open the stitch 14. If the length of the cutting line of the stitch 14 exceeds 4.5 mm, the film is likely to tear to a place other than the stitch 14 when the stitch 14 is opened, making it difficult to open the stitch 14.

[0034] (Bonding rate of the stitch) The bonding rate of the stitch 14 (the ratio of the joint part of the stitch 14) is 5% or more and 60% or less. If the bonding rate is less than 5%, the end of the stitch 14 will tear, making it difficult to open the stitch 14. If the bonding rate exceeds 60%, it will be difficult to open the stitch 14. The lower limit value of the bonding rate of the stitch 14 is preferably 10% or more, more preferably 20% or more. On the other hand, the upper limit value is preferably 45% or less, more preferably 35% or less. The length of the joint part of the stitch 14 and the length of the cut line are measured with a microscope.

[0035] (Ratio of stitches) The value obtained by dividing the length of the stitch 14 by the length parallel to the mountain fold grid line of the paper product 11 and multiplying by 100, that is, the ratio defined by ((length of the stitch 14 ÷ length parallel to the mountain fold grid line of the paper product 11) × 100 (%)) is 40% or more and 90% or less. If this ratio is less than 40%, the lotion tissue paper 21 will be caught at the outlet 15 and torn, making it difficult to take out. If this ratio exceeds 90%, the outlet 15 will open too much and the lotion tissue paper 21 will drop back, making it difficult to take out. The lower limit value of this ratio is preferably 50% or more, more preferably 60% or more. On the other hand, the upper limit value is preferably 85% or less, more preferably 80% or less.

[0036] (Film packaging base material) In this specification, the film packaging base material means a packaging base material using a film material. The film packaging base material 10 preferably contains at least a film, preferably does not contain paper, and preferably has printing on the film packaging base material 10. The basis weight value described later includes the ink for printing. The film packaging base material 10 preferably contains 90% by weight or more of the film, more preferably 95% by weight or more.

[0037] (Tube-shaped film) The film packaging substrate 10 is preferably in a tube shape (i.e., when the film packaging substrate 10 contains only the film substrate, it is a tube-shaped film). A tube-shaped film refers to a film formed by shaping a sheet-like film into a cylindrical shape like a tube.

[0038] (Material of the film) The film (hereinafter also referred to as the film substrate) constituting the film packaging substrate 10 may be formed as a single layer or a multi-layer. The material of the film can be used without particular limitation as a plastic (thermoplastic resin) film used when packaging ordinary paper products, and surface treatment may also be performed. From the viewpoints of cosmetic properties and anti-slip properties, among others, a matte film is preferably used. As the material of the plastic film, examples include conventionally known thermoplastic resins such as polyolefin (such as polyethylene and polypropylene), polyester (such as PET), polyamide (such as nylon), polycarbonate, polystyrene, and polyvinyl chloride, and preferably polyethylene.

[0039] As a specific configuration, when the film substrate is formed as a single layer, the material of the film is preferably any one selected from matte polyethylene, opalescent polyethylene, linear low-density polyethylene, and unstretched polypropylene. When the film substrate is formed as a multi-layer, as a specific configuration, the material of the film in the outermost layer of the film substrate is preferably any one selected from matte polyethylene, opalescent polyethylene, linear low-density polyethylene, and unstretched polypropylene. Also, the material of the film in the innermost layer is preferably any one selected from the above-mentioned four types of materials, and the materials of the film in the outermost layer and the innermost layer may be the same or different. Note that the number of layers does not include the ink layer. More preferably, the outermost layer is embossed polyethylene and the innermost layer is milky white polyethylene. When the outermost layer is embossed polyethylene, it can be firmly held without slipping, making it easier to take out the paper product 11 (easier to use). Also, when the innermost layer is milky white polyethylene, the friction with the paper product 11 is small, making it easier to take out the paper product 11 from the package 1.

[0040] In the case of the embossed polyethylene film which is the outermost layer of the tubular film, the method of embossing the film is not particularly limited, and conventionally known methods such as a method of pressing the surface of the tubular film against an embossing roll or a matte roll to give unevenness, or a method of giving unevenness by sandblasting can be adopted. These methods may be carried out at the time of forming the tubular film, but it is preferable to carry out them on single-layer polyethylene to obtain an embossed polyethylene film, and then laminate it with the innermost milky white polyethylene film or the like. Also, without performing surface treatment as described above, for example, a method using a polymer blend or a method of biaxially stretching a laminate of a polyolefin-based resin blend can also be adopted. Also, it is preferable that the tubular film is made into a multilayer film by extrusion laminating the outermost embossed film and the innermost milky white film using polyethylene.

[0041] Also, the ash content of the film packaging base material 10 is preferably 1.5% or more and 12% or less. If the ash content is less than 1.5%, the strength of the film packaging base material 10 is too high, and even at the part where the package 1 has ruled lines, it is difficult to bend, and the form of the package 1 becomes unstable and difficult to use (difficult to take out the paper product 11). If the ash content exceeds 12%, the stiffness of the film packaging base material 10 becomes weak, and even at parts other than the ruled lines of the package 1, it is easy to bend and the form is unstable, making the package 1 difficult to use (difficult to take out the paper product 11). Incidentally, the lower limit value of the ash content of the packaging base material is more preferably 2.0% or more, and even more preferably 2.5% or more. The upper limit value is more preferably 10% or less, and even more preferably 8.0% or less.

[0042] Ash refers to the proportion of minerals such as calcium, iron, sodium, magnesium, phosphorus, and potassium, and can be measured in accordance with JIS P 8251. Note that the ash content is determined by the following formula, but the oven-dry mass of the test piece is not measured, and the mass of the test piece of the packaging base material when conditioned at 23°C and 50% humidity is regarded as the oven-dry mass. Ash content (%) = mass of residue (g) ÷ oven-dry mass of test piece (g) × 100

[0043] In addition, the film packaging base material 10 of the present invention may include other layers in addition to the film base material. Examples of other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improvement layer, an overprint layer, a light-shielding layer, and the like. These other layers can be provided, for example, on the surface in contact with the paper product 11 or on the surface in contact with the outside air, and may be one layer or two or more layers. Note that the ink layer is not included in the number of layers.

[0044] (Grammage of the film packaging base material) The grammage of the film packaging base material 10 is 20 g / m 2 or more and 110 g / m 2 or less. If the grammage is less than 20 g / m 2 , the strength of the film packaging base material 10 is weak, and the package 1 is likely to bend at parts other than the ruled lines, making the form unstable and the package 1 difficult to use (difficult to take out the paper product 11). If the grammage exceeds 110 g / m 2 , the strength of the film packaging base material 10 is strong, and the package 1 is difficult to bend even at the parts with ruled lines, making the form of the package 1 unstable and difficult to use (difficult to take out the paper product 11). On the other hand, when the grammage of the film packaging base material 10 is within the above range, the package 1 is likely to dent in accordance with the decrease in the paper product 11, that is, even when the paper product 11 decreases, an easy-to-take-out and easy-to-use package 1 can be obtained.

[0045] Note that the lower limit value of the grammage of the film packaging base material 10 is preferably 30 g / m 2 or more, and more preferably 40 g / m 2 or more. On the other hand, the upper limit value is preferably 90 g / m 2 or less, and preferably 75 g / m2 The following is more preferable. The basis weight of the film packaging base material 10 can be measured in accordance with JIS P 8124.

[0046] (Thickness of the film packaging base material) The thickness of the film packaging base material 10 is 20 μm or more and 120 μm or less. If the thickness of the film packaging base material 10 is less than 20 μm, the film will break at places other than the perforation 14, making it difficult to open the perforation 14. If the thickness of the film packaging base material 10 exceeds 120 μm, it will be difficult to open the perforation 14.

[0047] Note that the lower limit value of the thickness of the film packaging base material 10 is preferably 30 μm or more, more preferably 40 μm or more. On the other hand, the upper limit value is preferably 100 μm or less, and even more preferably 90 μm or less. The thickness of the film packaging base material 10 can be measured in accordance with JIS K7130.

[0048] (Density of the film packaging base material) The density of the film packaging base material 10 has a lower limit value of 0.70 g / cm 3 or more, preferably 0.75 g / cm 3 or more, more preferably 0.80 g / cm 3 or more. On the other hand, the upper limit value is preferably 1.05 g / cm 3 or less, more preferably 1.00 g / cm 3 or less, and even more preferably 0.95 g / cm 3 or less. When the density of the film packaging base material 10 is within the above range, when the paper product 11 decreases, the package 1 is easily dented accordingly, that is, even when the paper product 11 decreases, an easily removable and easy-to-use package 1 can be obtained. The density is calculated and obtained from the basis weight and thickness of the film packaging base material 10 described above.

[0049] (Longitudinal tear strength) The tear strength (longitudinal tear strength) of the film packaging base material 10 in the MD direction is preferably 3 N or more and 19 N or less. If the longitudinal tear strength is less than 3 N, the film packaging base material 10 is likely to tear at places other than the perforation 14 when the perforation 14 is opened, making it difficult to open the perforation 14. If the longitudinal tear strength exceeds 19 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened. Note that the lower limit value of the longitudinal tear strength is more preferably 5 N or more, and even more preferably 8 N or more. On the other hand, the upper limit value is more preferably 16 N or less, and even more preferably 13 N or less.

[0050] (Transverse tear strength) The tear strength (transverse tear strength) of the film packaging base material 10 in the CD direction is preferably 5 N or more and 27 N or less. If the transverse tear strength is less than 5 N, the film packaging base material 10 is likely to tear at places other than the perforation 14 when the perforation 14 is opened, making it difficult to open the perforation 14. If the transverse tear strength exceeds 27 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened. Note that the lower limit value of the transverse tear strength is more preferably 7 N or more, and even more preferably 12 N or more. On the other hand, the upper limit value is more preferably 22 N or less, and even more preferably 18 N or less.

[0051] The tear strengths of the film packaging base material 10 in the MD direction and the CD direction are measured in accordance with JIS K 7128-1, and the width of the test piece is 10 mm.

[0052] (Longitudinal tensile strength) The tensile strength (longitudinal tensile strength) of the film packaging base material 10 in the MD direction is preferably 7 N or more and 39 N or less. If the longitudinal tensile strength is less than 7 N, the film packaging base material 10 is likely to tear at places other than the perforation 14 when the perforation 14 is opened, making it difficult to open the perforation 14. If the longitudinal tensile strength exceeds 39 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened. Note that the lower limit value of the longitudinal tensile strength is more preferably 10 N or more, and even more preferably 18 N or more. On the other hand, the upper limit value is more preferably 32 N or less, and even more preferably 26 N or less.

[0053] (Transverse tensile strength) The tensile strength (transverse tensile strength) of the film packaging substrate 10 in the CD direction is preferably 5 N or more and 30 N or less. If the tensile strength is less than 5 N, when the perforation 14 is opened, the film packaging substrate 10 is likely to break at places other than the perforation 14, making it difficult to open the perforation 14. If the transverse tensile strength exceeds 30 N, it becomes difficult to open the perforation 14 when the perforation 14 is opened. Note that the lower limit value of the transverse tensile strength is more preferably 8 N or more, and even more preferably 14 N or more. On the other hand, the upper limit value is more preferably 25 N or less, and even more preferably 20 N or less.

[0054] The tensile strengths of the film packaging substrate 10 in the MD direction and the CD direction are measured in accordance with JIS K 7127, and the width of the test piece is 10 mm.

[0055] (Paper product) An example of the paper product 11 packaged in the package 1 of the present invention is shown in FIG. 3. The package 1 of the present invention can be suitably applied particularly to packaging soft paper products such as tissue paper. The type of tissue paper is not particularly limited, and examples include laminated tissue papers such as tissue paper, wipes, lotion tissue paper, and paper hand towels. Among them, a tissue paper laminate in which two-ply tissue paper is laminated is preferable. Further, it is more preferable that the tissue paper is lotion tissue paper 21 in which a chemical solution is impregnated in the tissue paper. Since the paper product 11 is a laminate of lotion tissue paper 21, it is easy to take out the paper product 11 from the package 1 of the present invention even when the paper product 11 is reduced.

[0056] The lotion chemical solution preferably contains glycerin and silicone, and the silicone is more preferably amino-modified silicone. When the lotion chemical solution contains the above compounds, the paper product 11 becomes smooth, the friction between the paper product 11 and the outlet 15 becomes small, and the lotion tissue paper 21 is not caught by the outlet 15, so that the packaged product is easy to take out (easy to use).

[0057] The chemical solution to be impregnated into the tissue paper is not limited to a specific type. For example, an aqueous alcohol solution such as ethanol, which is usually impregnated into general wet tissues, is the main component. To prevent the drying of the tissue paper, polyhydric alcohols may be blended in combination with the alcohol component. In addition, an emulsifier, a thickener, a pH adjuster, a surfactant, a stabilizer, a discoloration inhibitor, a fragrance, a coloring agent, and the like may be appropriately blended.

[0058] Note that the lower limit of the lotion content per ply in the lotion tissue paper 21 is preferably 2.1 g / m 2 or more, and more preferably 2.4 g / m 2 or more. The upper limit is preferably 3.0 g / m 2 or less, and more preferably 2.7 g / m 2 or less. By setting it within the above range, the paper product 11 maintains a certain strength, and the lotion tissue paper 21 does not get caught at the outlet 15 and tear, so that the packaged product is easy to take out (easy to use).

[0059] The lotion content and the lotion content per ply in the lotion tissue paper 21 are measured as follows. Collect 5 g of the lotion tissue paper 21, dry it in a dryer (105 °C) for 120 minutes, then allow it to cool in a desiccator for 30 minutes, and measure the mass. Let the measured mass at this time be M1. Next, perform Soxhlet extraction for 4 hours using the measured lotion tissue paper and 150 ml of an extraction solvent (acetone:ethanol = 1:1). Concentrate the obtained extract by heating on a water bath, dry it in a dryer (105 °C) for 90 minutes, then allow it to cool in a desiccator for 30 minutes, and measure the mass. Let the measured mass at this time be M2. Then, using the two measured masses M1 and M2 obtained, M2 / M1×100 (%) is taken as the chemical solution content (lotion content [%]). Also, basis weight per ply × lotion content = chemical solution content (lotion content per ply) (g / m 2 ).

[0060] (Dimensions of the paper product) The lower limit of the length of the paper product 11 (the object to be packaged) in the direction parallel to the straight line direction of the mountain fold 12 in the paper product 11 is preferably 115 mm or more, more preferably 135 mm or more, and still more preferably 145 mm or more. On the other hand, the upper limit is preferably 205 mm or less, more preferably 195 mm or less, and still more preferably 185 mm or less. In addition, the length B of the paper product 11 in the direction orthogonal to both the straight line direction of the seal portion 13 and the straight line direction of the mountain fold 12 in the paper product 11 (see FIG. 3) is as described above.

[0061] (Number of sets of paper products) When the paper product 11 is a two-ply tissue paper, the number of sets is 200 sets or more and 270 sets or less. If the number of sets is less than 200 sets, the upper space is too empty and it is necessary to put a finger into the inside of the package 1, making it difficult to pull out the paper product 11. If the number of sets exceeds 270 sets, the upper space is too small, so the paper product 11 gets caught on the outlet 15, the perforation 14, etc., and the paper product 11 is continuously pulled out or torn during pulling out, making it difficult to pull out. In addition, the lower limit of the number of sets is preferably 210 sets or more, and more preferably 220 sets or more. On the other hand, the upper limit is preferably 260 sets or less, and more preferably 250 sets or less.

[0062] (Packaging form) As the packaging form of the package 1 according to the present invention, it is preferably a gusset packaging or a pillow packaging, and more preferably a gusset packaging.

[0063] Pillow packaging means that the object to be packaged placed on or under the sheet-like film packaging base material is wrapped in a cylindrical shape by overlapping the inner surfaces of both ends in the width direction of the film packaging base material and heat-sealing the overlapped portion to form a cylindrical shape, and heat-sealing the bottom portion or the mouth portion in a horizontal line according to the length (height) of the bag, and cutting it into individual bags at the sealed portion. This pillow packaging can be performed using known devices.

[0064] In addition, pillow packaging includes vertical pillow packaging in which a film packaging base material is fed vertically and the object to be packaged is wrapped while being filled from above, and horizontal pillow packaging in which the film packaging base material is fed horizontally and the object to be packaged is wrapped. When packaging thin paper, horizontal pillow packaging is preferred in view of the packaging speed and the form of the thin paper.

[0065] Gusset packaging is, as shown in FIG. 3, a cylindrical shape in which both ends of the bottom or the mouth portion corresponding to the length (height) of the bag are creased along the ruled lines and woven inside as the mountain fold portion 12. A paper product 11 is inserted into the film packaging base material 10 through an insertion port 16, which is sealed at one side by a seal portion 13, and is sealed in a horizontal row by heat sealing or the like. In addition, the sealed portion is cut into individual bags. This gusset packaging can be performed using a known device. Further, the paper product 11 may be inserted in a state where the film packaging base material 10 at the portion of the insertion port 16 is inverted to the outside so as not to be wound inside.

[0066] As described above, the present invention has been described using embodiments. Needless to say, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Further, it is obvious from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Example

[0067] Hereinafter, the present invention will be described in detail with reference to examples. Note that the present invention is not limited to the examples shown below.

[0068] <Examples and Comparative Examples> (Film Packaging Base Material) A film having a three-layer structure (the outermost layer is embossed polyethylene, the middle layer is polyethylene (extrusion laminate), and the innermost layer is milky white polyethylene) was prepared as the film packaging base material and used as the film packaging base material as it was. The results of measuring the basis weight, thickness, and density of the film packaging base material are shown in Tables 1 to 3.

[0069] (Lotion tissue paper package (gusset package)) As a film packaging base material, packaging was performed using a film with a perimeter of 380 mm (front width 117 mm, folding width 36.5 mm each) × pitch 308 mm. 240 sets of lotion tissue paper coated with a two-ply chemical solution as a paper product were placed in the film packaging base material adjusted to the above dimensions, sealed by gusset packaging, and a lotion tissue paper package with dimensions of 195 mm in the MD direction of the film packaging base material × 120 mm in the CD direction of the film packaging base material × 73 mm in height was obtained. Note that a form was adopted in which the paper product was wrapped with a tubular film. Further, after inserting the paper product, the excess in the pitch direction was cut to produce a package (Example 3).

[0070] Then, in the lotion tissue paper package, the interval A between the gusset portions in the direction orthogonal to the linear direction of the seal portion at the center of the gusset portion and the height B of the paper product were measured. Further, B / A×100 was calculated from the measured A and B, and the ratio of B to A (B / A (%)) was calculated.

[0071] (Ease of taking out the object to be packaged (ease of use of the package)) Regarding the produced lotion tissue paper package, the perforation at the take-out opening was opened, and 20 monitors evaluated the ease of taking out the lotion tissue paper (ease of use of the package) when taking out the lotion tissue paper from the package and using it. The evaluation criteria are as follows. A: 0 - 1 person who felt that it was difficult to take out the lotion tissue paper B: 2 - 3 people who felt that it was difficult to take out the lotion tissue paper C: 4 - 6 people who felt that it was difficult to take out the lotion tissue paper D: 7 - 20 people who felt that it was difficult to take out the lotion tissue paper

[0072] (Ease of holding the package) Twenty people were asked to evaluate the ease of handling (portability) of the prepared lotion tissue paper package. The evaluation criteria are as follows. A: 0 - 1 person who felt that the package was too small or too large and difficult to carry B: 2 - 3 people who felt that the package was too small or too large and difficult to carry C: 4 - 6 people who felt that the package was too small or too large and difficult to carry D: 7 - 20 people who felt that the package was too small or too large and difficult to carry

[0073] (Ease of opening the perforation during use) Twenty people were asked to evaluate the ease of cutting (opening) the perforation when opening the perforation of the prepared lotion tissue paper package. The evaluation criteria are as follows. A: 0 - 1 person who felt that it was difficult to open the perforation B: 2 - 3 people who felt that it was difficult to open the perforation C: 4 - 6 people who felt that it was difficult to open the perforation D: 7 - 20 people who felt that it was difficult to open the perforation

[0074] (Example 1), (Example 2), (Example 4) - (Example 21), (Comparative Example 1) - (Comparative Example 11) In the same manner as in Example 3, film packaging base materials having the physical properties shown in Tables 1 - 3 were prepared for Examples 1, 2, 4 - 21 and Comparative Examples 1 - 11. Using these, lotion tissue paper packages (gusset packaging) were prepared in the same manner as in Example 3, and the ease of taking out the lotion tissue paper, the ease of handling the package, and the ease of opening the perforation during use were evaluated.

[0075]

Table 1

[0076]

Table 2

[0077]

Table 3

[0078] As is clear from the results shown in Tables 1 to 3, in all of the packages of Examples 1 to 21, the lotion tissue paper was easy to take out, the package was easy to hold, and the perforation was easy to open during use. On the other hand, in all of Comparative Examples 1 to 11, the lotion tissue paper was difficult to take out, the package was difficult to hold and / or the perforation was difficult to open during use.

[0079] Therefore, even when the package of the present invention uses a paper product, particularly a paper product such as tissue paper, as the object to be packaged, it is possible to provide a package for paper products in which the contents of the object to be packaged are difficult to collapse (easy to take out), easy to hold, and the perforation is easy to open.

Explanation of Signs

[0080] 1 Package (package for paper products) 10 Film packaging base material 11 Paper product (object to be packaged) 12 Valley fold 13 Seal part 14 Perforation 15 Take-out port 16 Insertion port 21 Lotion tissue paper

Claims

1. A package for a paper product, in which a paper product is covered with a film packaging base material having four mountain folds extending in one direction and the paper product is sealed with a seal portion, Each of the mountain folds has a crease, The film packaging substrate has a basis weight of 20 g / m ２ 110g / m or more ２ and the thickness is 20 μm or more and 120 μm or less; The seal portions are provided at both ends of the mountain fold, and each seal portion is formed in a substantially straight line perpendicular to the direction of the mountain fold and substantially parallel to the mountain fold; When the distance between the mountain folds in the center of the mountain folds of the film packaging base material in a direction perpendicular to the linear direction of the sealed portion is defined as A, and the length of the paper product in a direction perpendicular to both the linear direction of the sealed portion and the linear direction of the mountain folds is defined as B, the ratio of B to A (B / A×100(%)) is 65% or more and 175% or less, The paper product is a tissue paper laminate having 200 to 270 sets of tissue paper of 2 or more plies laminated therein, At least one or more openings having linear perforations parallel to the mountain fold lines are provided on the top surface of the package, The perforation has a bond rate of 5% or more and 60% or less, and a ratio defined as ((length of perforation ÷ length parallel to the mountain fold line of the paper product) × 100 (%)) is 40% or more and 90% or less.

2. The packaging body for paper products according to claim 1, characterized in that the longitudinal tear strength of the film packaging base material is 3N or more and 19N or less.

3. The packaging body for paper products according to claim 2 , characterized in that the lateral tear strength of the film packaging base material is 5 N or more and 27 N or less.

4. The packaging body for paper products according to claim 3, characterized in that the longitudinal tensile strength of the film packaging base material is 7N or more and 39N or less.

5. The packaging body for paper products according to claim 4, characterized in that the lateral tensile strength of the film packaging base material is 5 N or more and 30 N or less.

6. The package for paper products according to claim 5, characterized in that the film packaging substrate is a tube-type film.

7. The packaging body for paper products according to claim 5, wherein the packaging form of the film packaging substrate is gusset packaging.

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