Packaging bag, manufacturing method thereof, and sheet packaging body

Abstract

To provide a paper packaging bag allowed to suppress package performances from lowering.SOLUTION: A packaging bag, for caramel-packaging a sheet, comprises a paper layer containing a paper component and resin layers containing a thermoplastic resin provided on both sides of the paper layer, in which the paper component of the packaging bag has a percentage of equal to or higher than 45%.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a packaging bag, a method for manufacturing a packaging bag, and a sheet packaging body. [Background technology]

[0002] Sheet packages containing sheet rolls such as toilet paper are distributed in a state in which multiple sheet rolls are contained in a packaging bag made of resin film (for example, Patent Document 1). In recent years, from the viewpoint of reducing environmental burdens such as global warming due to CO2 emissions and marine pollution due to microplastics, there has been a movement to shift the material of the packaging bags that contain the sheet rolls from resin to paper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-90255 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the packaging bag for the sheet packaging body is made of paper, the packaging performance is reduced, as paper packaging bags are less flexible than plastic packaging bags, and the packaging bag may tear or the sealed portion of the packaging bag may peel off during the manufacturing or transportation of the sheet packaging body.

[0005] An object of the present invention is to provide a paper packaging bag that suppresses deterioration of packaging performance. [Means for solving the problem]

[0006] A first aspect of the present invention is a packaging bag for caramel packaging a sheet, the packaging bag having a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on both sides of the paper layer, wherein the proportion of the paper component in the packaging bag is 45% or more.

[0007] In this specification, the caramel packaging refers to a packaging form in which a bottom seal is applied and a side seal is further applied in a state where a sheet roll is set on a packaging bag sheet. The resin layers provided on both sides of the paper layer refer to resin layers laminated on both the front and back sides of the paper layer.

[0008] In the first aspect, the packaging bag can be made soft by having a resin layer containing a thermoplastic resin provided on both sides of the paper layer containing a paper component. This makes the packaging bag less stiff and gives the packaging bag conformability. Therefore, even if the material of the packaging bag is shifted from resin to paper, it is possible to provide a packaging bag that is less likely to tear during production or transportation.

[0009] In the first embodiment, the resin layers provided on both sides of the paper layer contain a thermoplastic resin, so that the resin layers can be disposed on both the outside and inside of the packaging bag. This allows the resin layers to function as an adhesive (have an adhesive function) on both the outside and inside of the packaging bag when the sealed portion of the packaging bag is heated. Therefore, in the first embodiment, even when the sheet is packaged in caramel, sealing is easy and the sealed portion is not easily peeled off.

[0010] Furthermore, in the first aspect, by making the ratio of the paper component in the packaging bag 45% or more, even if the resin layer functions as an adhesive, the resin layer arranged on the inside of the packaging bag is less likely to stick to the sheet contained in the packaging bag. Also, in the first aspect, since the ratio of the paper component in the packaging bag is 45% or more, it is possible to provide a sheet packaging body with reduced environmental impact.

[0011] In a second aspect of the present invention, the paper layer has a basis weight of 10 g / m 2 More than 40g / m 2 The packaging bag is as follows: In this specification, the basis weight of the paper layer refers to the basis weight measured in accordance with the provisions of JIS P 8124 (2011).

[0012] In a second embodiment, the paper layer has a basis weight of 10 g / m 2 More than 40g / m2 By doing as follows, the strength of the packaging bag can be maintained. Therefore, according to the second aspect, a packaging bag that is even more resistant to tearing can be provided.

[0013] A third aspect of the present invention is a packaging bag in which the paper layer is formed of kraft paper or rayon paper. In this specification, kraft paper refers to paper made from kraft pulp. Rayon paper refers to kraft pulp mixed with rayon fiber, which is chemically synthesized from wood pulp or the like. From the viewpoint of achieving both softness and strength in the packaging bag, it is preferable that the rayon fiber content of the rayon paper is 20% or less by mass.

[0014] In the third embodiment, the paper layer is made of craft paper or rayon paper, thereby making it possible to maintain the strength of the packaging bag.

[0015] A fourth aspect of the present invention is a packaging bag, wherein the thickness of each of the resin layers is 5 μm or more and 40 μm or less. In this specification, the thickness of the resin layer refers to a thickness measured in accordance with the provisions of JIS P 8118 (2014).

[0016] In the fourth aspect, by setting the thickness of each resin layer on both sides of the paper layer to 5 μm or more and 40 μm or less, it becomes easier to maintain the ratio of paper components in the packaging bag at 45% or more. In addition, the adhesive function of the resin layer when sealing the packaging bag can be maintained while suppressing the stiffness of the packaging bag.

[0017] A fifth aspect of the present invention is a packaging bag, in which the thermoplastic resin is low-density polyethylene. In the fifth aspect, by using low-density polyethylene as the thermoplastic resin contained in each resin layer, it is possible to further reduce the stiffness of the packaging bag and improve the adhesive function of the resin layer when sealing the packaging bag.

[0018] A sixth aspect of the present invention is a packaging bag having a longitudinal tear strength of 70 mN to 350 mN and a transverse tear strength of 250 mN to 950 mN. In this specification, the tear strength refers to the tear strength measured in accordance with the provisions of JIS P 8116 (2000). The longitudinal direction is the flow direction of the fibers constituting the packaging bag, and the transverse direction is the direction perpendicular to the flow direction of the fibers constituting the packaging bag.

[0019] In the sixth aspect, in a paper packaging bag for packaging a sheet in caramel, if the tear strength in the longitudinal direction is 70 mN or more and 350 mN or less and the tear strength in the lateral direction is 250 mN or more and 950 mN or less, the flexibility and conformability of the caramel packaging bag are improved. As a result, in the sixth aspect, it is possible to provide a caramel packaging bag that is difficult to break during production or transportation, is easy to seal, and the sealed portion is difficult to peel off.

[0020] A seventh aspect of the present invention is a packaging bag having a longitudinal softness of 90 mN / 100 mm or more and 800 mN / 100 mm or less and a lateral softness of 40 mN / 100 mm or more and 330 mN / 100 mm or less. In this specification, the softness refers to the softness measured in accordance with the provisions of JIS L 1096 E method.

[0021] In the seventh aspect, in a paper packaging bag for packaging a sheet in caramel, the softness in the vertical direction is 90 mN / 100 mm or more and 800 mN / 100 mm or less, and the softness in the horizontal direction is 40 mN / 100 mm or more and 330 mN / 100 mm or less, thereby further improving the flexibility and conformability of the caramel packaging bag. As a result, in the seventh aspect, it is possible to provide a caramel packaging bag that is difficult to break during production or transportation, is easy to seal, and has a sealed portion that is difficult to peel off.

[0022] An eighth aspect of the present invention is a method for producing a packaging bag according to any one of the first to seventh aspects, comprising a welding step of heat-welding a sealed portion of the packaging bag, and a heating temperature in the welding step is 120° C. or higher and 180° C. or lower. In this specification, heat welding refers to heating parts of a packaging bag sheet to heat and fuse parts of the packaging bag sheet together.

[0023] In the eighth aspect, in a packaging bag for caramel-wrapping a sheet, the heating temperature for heat-sealing the sealed portion of the packaging bag is set to 120°C or higher and 180°C or lower, so that even if the packaging bag for caramel-wrapping a sheet is shifted from being made of resin to being made of paper, a packaging bag with high sealing properties and a seal that is less likely to peel off can be obtained.

[0024] A ninth aspect of the present invention is a method for producing a packaging bag having a seal strength of 0.2 kN / m to 0.5 kN / m. In this specification, the seal strength refers to the seal strength measured in accordance with the provisions of JIS Z0238 (1998).

[0025] In the ninth aspect, when the seal strength of the seal portion of the packaging bag for caramel-packaging the sheet is 0.2 kN / m or more and 0.5 kN / m, when the packaging bag for caramel-packaging the sheet is shifted from a plastic to a paper bag, the seal portion is less likely to peel off, resulting in a packaging bag with higher sealing properties.

[0026] A tenth aspect of the present invention is a sheet packaging body having the packaging bag according to any one of the first to seventh aspects and a sheet contained in the packaging bag. In the tenth aspect, by forming a sheet packaging body in which a sheet is contained in the above-mentioned packaging bag, the same effect as the above-mentioned packaging bag can be obtained. That is, according to the tenth aspect, even if the packaging bag is shifted from being made of resin to being made of paper, it is possible to provide a sheet packaging body in which the packaging bag is less likely to be torn during manufacturing or transportation.

[0027] In addition, in the tenth aspect, when sealing (or sealing) the packaging bag, the resin layers provided on both layers of the paper layer are heated, and the melted resin layers can function as an adhesive (have an adhesive function), so that even when the sheet is caramel-packaged, the packaging bag can be easily sealed and a sheet package can be obtained in which the sealed portion is not easily peeled off.

[0028] Furthermore, in the tenth aspect, by making the ratio of the paper component in the packaging bag 45% or more, even if the resin layer functions as an adhesive, a sheet packaging body can be obtained in which the resin layer arranged on the inside of the packaging bag is unlikely to stick to the sheet contained in the packaging bag. Also, in the tenth aspect, since the ratio of the paper component in the packaging bag is 45% or more, a sheet packaging body that reduces the environmental load can be obtained. Effect of the Invention

[0029] According to one aspect of the present invention, a paper packaging bag that suppresses deterioration of packaging performance can be provided. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 is a diagram showing a sheet package in which a sheet roll is accommodated in a packaging bag. [Diagram 2] FIG. 2 is a diagram showing a sheet roll contained in a packaging bag. [Diagram 3] 2 is a view of the sheet packaging body of FIG. 1 as seen from the top side. [Figure 4] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the bottom side. [Diagram 5] 2 is a view of the sheet wrapping body of FIG. 1 as seen from one side. [Figure 6] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the other side surface side. [Figure 7] 2 is a view of the sheet wrapping body of FIG. 1 as seen from one end surface side. [Figure 8] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the other end surface side. [Figure 9] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] <Sheet packaging> An embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, common parts may be given the same reference numerals and explanations may be omitted. In each drawing, the scale of each member may differ from the actual scale. In each drawing, a three-dimensional Cartesian coordinate system with three axial directions (X direction, Y direction, Z direction) is used, and the width direction of the packaging bag is defined as the X direction, the longitudinal direction is defined as the Y direction, and the height direction (vertical direction or thickness direction) is defined as the Z direction.

[0032] Fig. 1 is a diagram showing a sheet packaging body in which a sheet is contained in a packaging bag of the embodiment. Fig. 2 is a diagram showing a sheet contained in the packaging bag. Figs. 3, 4, 5, 6, 7, and 8 are diagrams showing the sheet packaging body of Fig. 1 as viewed from the top side, bottom side, one side side, the other side side, one end side, and the other end side, respectively. The sheet packaging body 100 is an example of a sheet packaging body according to the present embodiment, and includes a packaging bag 10 and a sheet roll 20.

[0033] <Sheet> The sheet roll 20 is an example of a sheet accommodated in the packaging bag according to this embodiment. As shown in Fig. 1, four sheet rolls 20 are accommodated in the packaging bag 10. As shown in Fig. 2, the sheet roll 20 is configured by winding a long sheet 21 around a hollow core 22. Note that the sheet is not limited to the sheet roll of this embodiment, and may be a sheet laminate in which a plurality of sheets are stacked.

[0034] The form of the sheet roll 20 is not particularly limited, and can be applied to, for example, sanitary thin paper such as toilet paper, kitchen paper, paper towels, and tissue paper. The use of the sheet roll 20 is not particularly limited, and can be applied to any of industrial, household, and portable uses. Among these, household toilet paper is preferably used as the sheet roll 20 in this embodiment.

[0035] The peripheral surface 21A of the sheet roll 20 faces the top surface 11, the bottom surface 12, the side surface 13, and the side surface 14 of the packaging bag 10, respectively, and a part of the peripheral surface 21A contacts a part of the peripheral surface 21A of the adjacent sheet roll 20. Of the four sheet rolls 20, the two on the end surface 15 side of the packaging bag 10 have side surfaces 21B of the sheet rolls 20 facing the end surface 15 of the packaging bag 10, and the two on the end surface 16 side of the packaging bag 10 have side surfaces 21C of the sheet rolls 20 facing the end surface 16 of the packaging bag 10.

[0036] The dimensions of the sheet roll 20 are not particularly limited, but the width dimension (roll width) L2 of the long sheet 21 in the width direction (Y direction) is preferably 85 mm or more and 400 mm or less, and the diameter dimension (roll diameter) W2 of the long sheet 21 in the radial direction (X direction or Z direction) is preferably 80 mm or more and 200 mm or less (see FIG. 2).

[0037] The number of plies of the long sheet 21 is not particularly limited, but can be one or more plies, and is preferably one or two plies (two layers).

[0038] The material of the long sheet 21 is not particularly limited, but may be, for example, a sheet of paper, nonwoven fabric, cloth, or the like, and is preferably paper (paper sheet). When the long sheet 21 is a paper sheet, base paper containing pulp as the main raw material is used. The pulp composition may be a known composition for paper sheets. For example, the blending ratio of pulp may be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0039] The pulp composition in the long sheet 21 (paper sheet) is not particularly limited. For example, softwood pulp such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp) can be used in any ratio. The ratio of hardwood pulp to softwood pulp is not limited, but is preferably 10:90 to 80:20, and more preferably, the ratio of softwood pulp to hardwood pulp is higher in the pulp composition. The pulp contained in the long sheet 21 (paper sheet) may be recycled paper pulp.

[0040] The basis weight of the long sheet 21 is not particularly limited, but in the case of paper, it is 5 g / m depending on the number of plies. 2 More than 80g / m 2 less than 10 g / m 2 More than 60g / m 2 Less than 10 g / m 2 More than 45g / m 2 For nonwoven fabrics, the density is 20 g / m 2 More than 100g / m 2 The following is preferable. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0041] The thickness of the long sheet 21 (paper sheet) is not particularly limited, and may be a paper thickness measured under the environment of JIS P 8111 (1998). For example, when the long sheet 21 is paper, the paper thickness is 50 μm or more and 600 μm or less, preferably 60 μm or more and 500 μm or less, and more preferably 130 μm or more and 400 μm or less, per two plies.

[0042] The long sheet 21 (paper sheet) may be embossed. Such embossing can be performed by a known embossing method.

[0043] The hollow core 22 is a cylindrical core around which the long sheet 21 is wound in the circumferential direction (R direction) (see FIG. 2). The hollow core 22 may have a structure without a core (coreless structure). The material of the hollow core 22 is not particularly limited, and paper, resin, etc. may be used.

[0044] The form of the hollow core 22 is not particularly limited, and for example, when the hollow core 22 is a paper tube, it may be made of either one layer of cardboard or multiple layers of cardboard, or it may be a coated cardboard base paper on which printing or coating with a deodorant has been performed in advance. In addition, the way in which the cardboard tube is wound is not particularly limited, and for example, it may be either flat wound or spirally wound (so-called spiral paper tube).

[0045] The dimensions of the hollow core 22 are not particularly limited. For example, the length of the hollow core 22 in the longitudinal direction (Y direction) is approximately the same as the roll width in the width direction (Y direction) of the sheet roll 20 (85 mm to 400 mm). In addition, the diameter dimension of the hollow core 22 in the radial direction (X direction or Z direction) is 33 mm to 50 mm, preferably 35 mm to 45 mm (see FIG. 2).

[0046] <Packaging bag> The packaging bag 10 is an example of a packaging bag according to this embodiment. The packaging bag 10 has a paper layer 10A containing a paper component, and resin layers 10B and 10C containing a thermoplastic resin provided on both sides of the paper layer 10A (FIG. 9). In this embodiment, the packaging bag 10 has a three-layer structure in which resin layers (resin layers 10B and 10C) are laminated on both the front and back sides of the paper layer 10A (FIG. 9).

[0047] The packaging bag 10 has a paper component ratio of 45% or more. Here, the paper component is, for example, plant fiber glued together (pulp). The pulp composition of the paper component is not limited, and for example, the ratio of hardwood pulp to softwood pulp is 0:100 to 70:30, and preferably the pulp composition has a higher ratio of softwood pulp to hardwood pulp. Furthermore, recycled paper pulp may be used as the pulp.

[0048] The material of the paper layer 10A constituting the packaging bag 10 is not particularly limited, but it can be made of, for example, kraft paper or rayon paper. Here, kraft paper is paper made from kraft pulp. Rayon paper is made by blending rayon fiber, which is chemically synthesized from wood pulp, into kraft pulp. From the viewpoint of achieving both softness and strength of the packaging bag 10, it is preferable that the rayon fiber blending rate of the rayon paper is 20% by mass or less.

[0049] The basis weight of the paper layer 10A constituting the packaging bag 10 is not limited, but is preferably 10 g / m 2 More than 40g / m 2 More preferably, it is 15 g / m or less. 2 More than 35g / m 2 More preferably, 20 g / m or less 2 More than 30g / m 2 The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0050] The thickness of the paper layer 10A constituting the packaging bag 10 is not limited, but is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 90 μm or less, and even more preferably 40 μm or more and 75 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0051] The material of the thermoplastic resin contained in the resin layers 10B and 10C constituting the packaging bag 10 is not particularly limited, but is preferably low-density polyethylene. The low-density polyethylene may be either high-pressure low-density polyethylene (LDPE) or linear low-density polyethylene (L-LDPE).

[0052] The thickness of the resin layers 10B and 10C constituting the packaging bag 10 is not limited, but the thickness of each layer (each layer) of the resin layers 10B and 10C is preferably 5 μm or more and 40 μm or less, more preferably 7 μm or more and 35 μm or less, and even more preferably 9 μm or more and 30 μm or less. The paper thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0053] The basis weight of the packaging bag 10 is not limited, but is preferably 20 g / m 2 More than 70g / m 2 More preferably, it is 25 g / m 2 More than 65g / m 2 More preferably, 30 g / m or less 2 More than 60g / m 2 The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0054] The thickness of the packaging bag 10 is not limited, but is, for example, 25 μm to 105 μm, preferably 30 μm to 95 μm, and more preferably 45 μm to 80 μm. The thickness may be measured in accordance with the JIS P 8118 (2014) standard.

[0055] The density of the packaging bag 10 is not limited, but is, for example, 0.1 g / m 3 More than 1.5g / m 3 0.3g / m or less 3 More than 1.2g / m 3 Less than 0.5 g / m 3 More than 0.9g / m 3 The density is measured in accordance with the provisions of JIS P 8118 (2014).

[0056] The tensile strength of the packaging bag 10 is not limited, but is, for example, 1 kN / m or more and 6 kN / m or less, preferably 1.3 kN / m or more and 5.5 kN / m or less in the longitudinal direction (flow direction) of the fibers. 、More preferably, it is 1.5 kN / m or more and 5 kN / m or less, and in the lateral direction (direction perpendicular to the flow direction), it is 0.1 kN / m or more and 2.5 kN / m or less, and preferably, it is 0.2 kN / m or more and 2.4 kN / m or less. 、 More preferably, it is 0.3 kN / m or more and 2.3 kN / m or less. The tensile strength is measured in accordance with the provisions of JIS P 8113 (2006).

[0057] The tear strength of the packaging bag 10 is not limited, but is, for example, 70 mN or more and 350 mN or less, preferably 80 mN or more and 340 mN or less in the longitudinal direction (machine direction) of the fibers. 、 More preferably, the force is 90 mN or more and 330 mN or less, and in the lateral direction (direction perpendicular to the flow direction), the force is 250 mN or more and 950 mN or less, and preferably 280 mN or more and 930 mN or less. 、 More preferably, it is from 300 mN to 920 mN. The tear strength is measured in accordance with the provisions of JIS P 8116 (2000).

[0058] The softness of the packaging bag 10 is not limited, but for example, the softness in the longitudinal direction (flow direction) of the fibers is 90 mN / 100 mm or more and 800 mN / 100 mm or less, preferably 110 mN / 100 mm or more and 750 mN / 100 mm or less, more preferably 130 mN / 100 mm or more and 730 mN / 100 mm or less. The softness in the transverse direction (direction perpendicular to the flow direction) is 40 mN / 100 mm or more and 330 mN / 100 mm or less, preferably 50 mN / 100 mm or more and 310 mN / 100 mm or less, more preferably 60 mN / 100 mm or more and 310 mN / 100 mm or less. The softness is measured based on the handle-o-meter method according to the JIS L 1096 E method.

[0059] The packaging bag 10 has a top surface 11, a bottom surface 12, a side surface 13, a side surface 14, an end surface 15, and an end surface 16. In the packaging bag 10, the top surface 11 and the bottom surface 12 face each other in the vertical direction (Z direction), the side surface 13 and the side surface 14 face each other in the width direction (X direction), and the end surface 15 and the end surface 16 face each other in the longitudinal direction (Y direction). The end surfaces 15 and 16 are continuous with all of the top surface 11, the bottom surface 12, the side surface 13, and the side surface 14 (FIGS. 1, 3 to 8).

[0060] The dimensions of the packaging bag 10 are not particularly limited, but for example, the length L1 in the longitudinal direction (Y direction) of the packaging bag 10 is 170 mm or more and 800 mm or less, the width W1 in the width direction (X direction) perpendicular to the longitudinal direction (Y direction) of the packaging bag 10 is 160 mm or more and 400 mm or less, and the height H1 in the height direction (Z direction) is 160 mm or more and 400 mm or less. Note that the dimensions of the packaging bag 10 indicate the dimensions when four sheet rolls 20 are contained in the packaging bag 10.

[0061] The packaging bag 10 may have an opening (not shown) on at least one of the top surface 11, the bottom surface 12, the end surface 15, and the end surface 16 of the packaging bag 10. Such an opening can be formed, for example, by forming a tearing score line such as a perforation and tearing this tearing score line.

[0062] Here, the tearing score line indicates a score line where cuts and ties (uncut portions between two cuts) are arranged alternately, and when a tie is broken, the adjacent cuts on both sides become a continuous cut. The manner of cutting the tearing score line is not particularly limited, but it is preferable that the tearing score line penetrates the paper layer 10A and the resin layers 10B and 10C of the packaging bag.

[0063] The packaging bag 10 may have ventilation holes (not shown) in at least one of the top surface 11, bottom surface 12, side surface 13, side surface 14, end surface 15, and end surface 16 of the packaging bag 10. The ventilation holes can function as air holes in the packaging bag 10. The number, shape, and size of the ventilation holes are optional. The form of the ventilation holes is optional, but it is preferable for the ventilation holes to penetrate the paper layer 10A and the resin layers 10B and 10C of the packaging bag.

[0064] The packaging bag 10 has a pair of sealed portions 30, 40, 50 at both ends in the longitudinal direction (Y direction). The sealed portions 30, 40 are formed as side seals on end faces 15, 16 of the packaging bag 10, and the sealed portion 50 is formed as a bottom seal on the bottom surface 12 of the packaging bag 10.

[0065] The packaging bag 10 is configured as a caramel packaging bag. Specifically, the seal portions 30, 40 (side seals) of the end faces 15, 16 are sealed in a folded state (Figs. 1, 2 to 8). Note that, in the caramel packaging, a packaging bag sheet (not shown) is supplied to a packaging machine (not shown), and after the sheet roll is set, a bottom seal is applied to the packaging bag sheet in the packaging machine, and then a side seal is applied (Figs. 1, 7, and 8).

[0066] The sealed portions 30, 40, 50 may be in any form, and may be, for example, heat-sealed. Here, heat-sealing refers to heating a part of the packaging bag sheet to weld parts of the packaging bag sheet together. Specifically, the sealed portions 30, 40, 50 are heat-sealed with either the resin layer 10B or 10C of the packaging bag 10 disposed on the inside of the packaging bag 10 (FIGS. 1, 7 to 9).

[0067] The heating temperature in the heat welding is arbitrary, but is preferably adjusted to 120°C or higher and 180°C or lower, more preferably 130°C or higher and 170°C or lower, and further preferably 140°C or higher and 160°C or lower.

[0068] The seal strength in the heat welding is optional, but is preferably adjusted to 0.2 kN / m to 0.5 kN / m, more preferably 0.21 kN / m to 0.49 kN / m, and even more preferably 0.22 kN / m to 0.48 kN / m. In this specification, the seal strength refers to the seal strength measured in accordance with the provisions of JIS Z0238 (1998).

[0069] In the packaging bag 10, the wrap pitch of the sealed portions 30, 40, 50 is not particularly limited, but can be, for example, 80 mm or more and 400 mm or less, preferably 100 mm or more and 300 mm or less, and more preferably 160 mm or more and 200 mm or less.

[0070] Here, the lap pitch of the sealed portions 30, 40 refers to the height (Z direction) dimension of the adhesive area where the folded portion on the top surface 11 side and the folded portion on the bottom surface 12 side overlap on the end faces 15, 16 of the packaging bag 10. Also, the lap pitch of the sealed portion 50 refers to the width (X direction) dimension of the adhesive area where both longitudinal ends of the packaging bag sheet overlap on the bottom surface 12 of the packaging bag 10.

[0071] As described above, the packaging bag 10 of this embodiment has resin layers 10B, 10C containing a thermoplastic resin provided on both sides of the paper layer 10A containing a paper component, which makes it possible to soften the packaging bag 10. This makes it possible to reduce the stiffness of the packaging bag 10 and to impart conformability to the packaging bag 10. Therefore, according to this embodiment, even if the material of the packaging bag 10 is shifted from resin to paper, it is possible to provide a packaging bag 10 that is less likely to tear during manufacturing or transportation.

[0072] In addition, in this embodiment, the resin layers 10B, 10C provided on both sides of the paper layer 10A contain a thermoplastic resin, so that the resin layers 10B, 10C can be disposed on both the outside and inside of the packaging bag 10. As a result, when the sealed portions 30, 40, 50 of the packaging bag 10 are heated, the resin layers 10B, 10C can function as an adhesive (have an adhesive function) on both the outside and inside of the packaging bag 10. Therefore, in this embodiment, even when the sheet roll 20 is caramel-packaged, sealing is easy, and the sealed portions 30, 40, 50 are not easily peeled off.

[0073] In this embodiment, by setting the ratio of the paper component in packaging bag 10 to 45% or more, even when resin layers 10B, 10C function as adhesives, the resin layer (resin layer 10B or resin layer 10C) arranged on the inside of packaging bag 10 is less likely to stick to sheet roll 20 contained in packaging bag 10. Furthermore, in this embodiment, since the ratio of the paper component in packaging bag 10 is 45% or more, the environmental impact can be reduced.

[0074] In the packaging bag 10 of this embodiment, as described above, the basis weight of the paper layer 10A is 10 g / m 2 More than 40g / m 2 By doing as follows, it is possible to maintain the strength of the packaging bag 10. Therefore, according to this embodiment, it is possible to provide a packaging bag 10 that is even more difficult to break.

[0075] In this embodiment, as described above, by forming the paper layer 10A from craft paper or rayon paper, the strength of the packaging bag 10 can be maintained.

[0076] In this embodiment, as described above, by setting the thickness of each of the resin layers 10B and 10C provided on both sides of the paper layer to 5 μm or more and 40 μm or less, the ratio of the paper component in the packaging bag can be easily maintained at 45% or more. In addition, the adhesive function of the resin layers 10B and 10C when sealing the packaging bag can be maintained while suppressing the stiffness of the packaging bag.

[0077] In this embodiment, as described above, by using low-density polyethylene as the thermoplastic resin contained in each resin layer 10B, 10C, the stiffness of the packaging bag 10 can be further suppressed while improving the adhesive function of the resin layers 10B, 10C when sealing the packaging bag 10.

[0078] In this embodiment, as described above, the paper packaging bag for caramel-packaging the sheet roll 20 has a longitudinal tear strength of 70 mN or more and 350 mN or less and a lateral tear strength of 250 mN or more and 950 mN or less, thereby improving the flexibility and conformability of the caramel packaging bag 10. As a result, this embodiment can provide a caramel packaging bag 10 that is difficult to break during manufacturing and transportation, is easy to seal, and has seal portions 30, 40, and 50 that are difficult to peel off.

[0079] In this embodiment, as described above, in the paper packaging bag 10 for caramel-packaging the sheet roll 20, the softness in the vertical direction is 90 mN / 100 mm or more and 800 mN / 100 mm or less, and the softness in the horizontal direction is 40 mN / 100 mm or more and 330 mN / 100 mm or less, thereby further improving the flexibility and conformability of the caramel packaging bag 10. As a result, in this embodiment, it is possible to provide a caramel packaging bag 10 that is difficult to break during manufacturing or transportation, is easy to seal, and has sealed portions 30, 40, and 50 that are difficult to peel off.

[0080] In this embodiment, as described above, by configuring the sheet packaging body 100 in which the sheet roll 20 is accommodated in the packaging bag 10, the same effects as those of the above-mentioned packaging bag 10 can be obtained. That is, according to this embodiment, even if the packaging bag 10 is shifted from being made of resin to being made of paper, it is possible to provide a sheet packaging body in which the packaging bag is less likely to tear during manufacturing or transportation.

[0081] Furthermore, in this embodiment, as described above, when sealing (or sealing) the packaging bag 10, the resin layers 10B, 10C provided on both layers of the paper layer 10A are heated, and the melted resin layers 10B, 10C can function as an adhesive (have an adhesive function), so that even when the sheet roll 20 is caramel-packaged, the packaging bag 10 can be easily sealed, and a sheet packaging body 100 can be obtained in which the sealed portions 30, 40, 50 are not easily peeled off.

[0082] Furthermore, in this embodiment, as described above, by setting the ratio of the paper component in the packaging bag 10 to 45% or more, even when the resin layers 10B, 10C function as adhesives, a sheet packaging body 100 can be obtained in which the resin layer (resin layer 10B or resin layer 10C) arranged on the inside of the packaging bag 10 is less likely to stick to the sheet roll 20 contained in the packaging bag 10. Also, in this embodiment, since the ratio of the paper component in the packaging bag 10 is 45% or more, a sheet packaging body 100 that reduces environmental impact can be obtained.

[0083] <Manufacturing method of packaging bags> The manufacturing method of the packaging bag according to this embodiment is a method for manufacturing the above-mentioned packaging bag 10. Specifically, it has a welding process for heat-welding the sealed portions 30, 40, and 50 of the packaging bag 10. In the welding process, heat welding is performed by adjusting the heating temperature to 120° C. or higher and 180° C. or lower, preferably 130° C. or higher and 170° C. or lower, and more preferably 140° C. or higher and 160° C. or lower.

[0084] In the welding step, the seal strength is preferably adjusted to 0.2 kN / m to 0.5 kN / m, more preferably 0.21 kN / m to 0.49 kN / m, and further preferably 0.22 kN / m to 0.48 kN / m. Note that, for the steps other than the welding step, steps used in the conventional method for manufacturing packaging bags of resin films can be adopted.

[0085] According to the manufacturing method of the packaging bag of this embodiment, by setting the heating temperature in the welding process for heat-welding the seal portions 30, 40, and 50 of the packaging bag 10 to 120°C or higher and 180°C or lower, a packaging bag 10 with high sealing properties can be obtained even if the material of the packaging bag is shifted from resin to paper as described above.

[0086] Furthermore, according to the manufacturing method of the packaging bag of this embodiment, if the seal strength of the sealed portions 30, 40, 50 of the packaging bag 10 for caramel-packaging the sheet roll 20 is 0.2 kN / m or more and 0.5 kN / m, when the packaging bag 10 for caramel-packaging the sheet roll 20 is shifted from being made of resin to being made of paper, the sealed portions 30, 40, 50 will be even less likely to peel off, resulting in a packaging bag 10 with higher sealing properties. EXAMPLES

[0087] The present invention will now be described in more detail with reference to the following examples. The examples and comparative examples were evaluated by the following tests.

[0088] [Test specimen] A sheet packaging body 100 in which four sheet rolls 20 were caramel-packaged in a packaging bag 10 was prepared as a test specimen (FIGS. 1 to 8). The sheet roll 20 used was a commercially available roll-type toilet paper (manufactured by Daio Paper Corporation, Elleair Toilet Tissue, 55 m, single, 138 g / roll).

[0089] [Yonetsubo] The basis weight of the test specimen packaging bag 10 was measured in accordance with the provisions of JIS P 8124 (2011). The unit of basis weight is g / m 2 It is.

[0090] [Paper thickness] The paper thickness (thickness) of the packaging bag 10 in the test specimen was measured in accordance with the provisions of JIS P 8118 (2014). The unit of thickness is μm.

[0091] [density] The density of the packaging bag 10 in the test specimen was measured in accordance with the provisions of JIS P 8118 (2014). The unit of density is g / m 3 It is.

[0092] [Tensile strength] For the packaging bag 10 of the test specimen, the tensile strength (mN) in the longitudinal direction (flow direction) and transverse direction (direction perpendicular to the flow direction) was measured using a Tensilon universal testing machine (RTG-1210, manufactured by A&D Co., Ltd.) in accordance with the provisions of JIS P 8113 (2006).

[0093] [stretch] For the packaging bag 10 in the test specimen, the elongation (%) in the longitudinal direction (flow direction) and transverse direction (direction perpendicular to the flow direction) was measured using a Tensilon universal testing machine (RTG-1210, manufactured by A&D Co., Ltd.) in accordance with the provisions of JIS P 8113 (2006).

[0094] [Tear strength] For the packaging bag 10 test specimen, the tear strength in the longitudinal direction (machine direction) and transverse direction (direction perpendicular to the machine direction) of the fibers was measured using a tear strength tester (Elmendorf tear strength tester (digital display type) manufactured by Kumagai Riki Kogyo Co., Ltd.) in accordance with the provisions of JIS P 8116 (2000).

[0095] [Softness] The softness of the test packaging bag 10 was measured according to the handle-o-meter method in accordance with the JIS L 1096 E method. The test piece was 100 mm x 100 mm in size, and the clearance was 5 mm. Measurements were performed five times in each of the front and vertical directions (flow direction) and the front and horizontal directions (direction perpendicular to the flow direction), and the average value of all 10 measurements was expressed in units of mN / 100 mm. The softness was measured based on the handle-o-meter method in accordance with the JIS L 1096 E method. However, the test piece was 100 mm x 100 mm in size, and the clearance was 5 mm. The softness was measured using a handle-o-meter (a touch tester manufactured by Kumagai Riki Kogyo Co., Ltd.) by measuring one ply five times in each of the vertical and horizontal directions, and the average value of all 10 measurements was expressed to one decimal place in units of mN.

[0096] [Heat seal strength] The heat seal strength of the test packaging bag 10 was confirmed. The heat seal strength was measured at 120°C, 140°C, 160°C, and 180°C. The heat seal strength was measured using a load cell tensile tester (Tensilon RTG-1210, manufactured by A&D Co., Ltd.) and a heat gradient tester (TYPE HG-100, manufactured by Toyo Seiki Co., Ltd.) by folding a test piece 300 mm long in the vertical direction and 120 mm wide in the horizontal direction with the heat seal surface on the inside, and sealing the test piece with the heat gradient tester. At this time, the test is performed at four levels: a load of 1.0 kgf, a time of 1.0 second, and temperature settings of 120°C, 140°C, 160°C, and 180°C. The heat block is 5 blocks (5 rows horizontally) with a width of 1.0 cm and a length of 2.5 cm, and the load is uniform. A test piece for measuring the heat seal strength is taken from the heat-sealed test piece. The test piece is about 1.5 cm wide x 15 cm long, including one heat block for the heat-sealed part. The tensile test is performed by setting both ends of the test piece so that the heat-sealed part is located in the center of the test piece with a chucking distance of 100 mm for the load cell tensile tester.

[0097] [Paper component (ratio)] For the test specimen packaging bag 10, the ratio (%) of the paper component was calculated from the specific gravity of the paper layer and the specific gravity of the resin layer.

[0098] [Side seal adhesion] The adhesion of the side seals (sealed portions 30, 40) of the test specimens was evaluated. When the test specimens were compressed by hand from the top surface 11 and the bottom surface 12, if the side seals (sealed portions 30, 40) did not peel off, they were evaluated as ◯ (good), if the side seals were torn, they were evaluated as △ (slightly poor), and if the side seals did not adhere, they were evaluated as × (poor).

[0099] [Side seal roll adhesion] The test specimens were evaluated for roll adhesion of the side seals (sealed portions 30, 40). The evaluation was as follows: ◯ (good) if the sheet roll 20 was not torn when the side seals (sealed portions 30, 40) were peeled off; △ (slightly poor) if the sheet roll 20 adhered to the side seal of the packaging bag 10; and × (poor) if the sheet roll 20 stuck to the side seal of the packaging bag and tore.

[0100] [Bottom seal adhesion] The adhesion of the bottom seal (sealed portion 50) of the test specimen was evaluated. The test specimen was compressed by hand from the top surface 11 and the bottom surface 12, and the test specimen was evaluated as follows: ◯ (good) if the bottom seal (sealed portion 50) did not peel off, △ (slightly poor) if the bottom seal was torn, and × (poor) if the bottom seal did not adhere.

[0101] [Bottom seal roll adhesion] The test specimens were evaluated for roll adhesion of the bottom seal (sealed portion 50). The evaluation was as follows: ◯ (good) if the sheet roll 20 was not torn when the bottom seal (sealed portion 50) was peeled off, △ (slightly poor) if the sheet roll 20 adhered to the bottom seal of the packaging bag 10, and × (poor) if the sheet roll 20 stuck to the bottom seal of the packaging bag and tore.

[0102] [Torn packaging bag] The test specimen was compressed by hand from the top surface 11 and the bottom surface 12 to check whether the packaging bag 10 broke. The evaluation was as follows: ○ (good) if the packaging bag 10 did not break, △ (slightly poor) if the packaging bag 10 did not break but had no flexibility, and × (poor) if the packaging bag 10 broke.

[0103] The materials used in the examples and comparative examples will be described below.

[0104] [Material 1] Paper layer 10A with a basis weight of 30g / m 2 The resin layers 10B and 10C (both sides of the paper layer 10A) are made of rayon paper with a basis weight of 10 g / m 2A three-layer structure was constructed using low-density polyethylene with a thickness of 11 μm. The properties of Material 1 (paper components (ratio), basis weight, thickness, density, tensile strength, elongation, tear strength, softness, and heat seal strength) are shown in Table 1.

[0105] [Material 2] Paper layer 10A with a basis weight of 30g / m 2 The resin layers 10B and 10C (both sides of the paper layer 10A) are made of craft paper with a basis weight of 14 g / m 2 Material 2 was constructed in the same manner as material 1, except that a low-density polyethylene having a thickness of 15 μm was used. The properties of material 2 are shown in Table 1.

[0106] [Material 3] Paper layer 10A with a basis weight of 20g / m 2 Material 3 was constructed in the same manner as material 1, except that the rayon paper was used and a two-layer structure was formed with only resin layer 10B (one side of paper layer 10A). The properties of material 3 are shown in Table 1.

[0107] [Material 4] The resin layer 10B (one side of the paper layer 10A) is a two-layer structure, and the resin layer 10B has a basis weight of 18 g / m 2 Material 4 was constructed in the same manner as Material 1, except that a low-density polyethylene having a thickness of 20 μm was used. The properties of Material 4 are shown in Table 1.

[0108] [Material 5] The resin layer 10B (one side of the paper layer 10A) is a two-layer structure, and the resin layer 10B has a basis weight of 27 g / m 2 Material 5 was constructed in the same manner as material 2, except that a low-density polyethylene having a thickness of 30 μm was used. The properties of material 5 are shown in Table 1.

[0109] [Material 6] The packaging bag 10 is composed of only a paper layer 10A, and the paper layer 10A has a basis weight of 65 g / m 2 Material 6 was constructed in the same manner as Material 1, except that unbleached kraft paper was used. The properties of Material 6 are shown in Table 1.

[0110] Examples and comparative examples will be described below.

[0111] [Example 1] Material 1 was used for packaging bag 10, and caramel packaging was performed with the heating temperature of the side seal at 142°C, the heating temperature of the bottom seal at 110°C, and the sealing speed at 50 m / sec. Table 2 shows the adhesion of the side seal, the roll adhesion of the side seal, the adhesion of the bottom seal, the roll adhesion of the bottom seal, and the tear of the packaging bag.

[0112] [Example 2] The fabrication and evaluation were carried out in the same manner as in Example 1, except that the heating temperature of the side seal was set to 147° C. The results are shown in Table 2.

[0113] [Example 3] The production and evaluation were carried out in the same manner as in Example 1, except that the heating temperature of the side seal was 152° C. The results are shown in Table 2.

[0114] [Example 4] The production and evaluation were carried out in the same manner as in Example 1, except that the heating temperature of the side seal was 157° C. The results are shown in Table 2.

[0115] [Example 5] Packaging bag 10 material 2 The measurements and evaluations were carried out in the same manner as in Example 1, except that the heating temperature of the side seal was 153° C. and the heating temperature of the bottom seal was 120° C. The results are shown in Table 2.

[0116] [Example 6] The fabrication and evaluation were carried out in the same manner as in Example 5, except that the heating temperature of the side seal was 157° C. The results are shown in Table 2.

[0117] [Example 7] The fabrication and evaluation were carried out in the same manner as in Example 5, except that the heating temperature of the side seal was 161° C. The results are shown in Table 2.

[0118] [Comparative Example 1] The material 3 is used for the packaging bag 10, and the heating temperature of the side seal is 160 The measurements and evaluations were carried out in the same manner as in Example 1, except that the heating temperature of the bottom seal was 115° C. and the compression ratio was 1.05, and the compression ratio of the bottom seal was 1.05. The results are shown in Table 3.

[0119] [Comparative Example 2] The production and evaluation were carried out in the same manner as in Comparative Example 1, except that the heating temperature of the side seal was 165° C. The results are shown in Table 3.

[0120] [Comparative Example 3] Measurements and evaluations were performed in the same manner as in Example 1, except that Material 4 was used for the packaging bag 10, the heating temperature for the side seal was 197° C., the heating temperature for the bottom seal was 205° C., and the sealing speed was 47 m / sec. The results are shown in Table 3.

[0121] [Comparative Example 4] The heating temperature of the side seal was 222°C, the heating temperature of the bottom seal was 222°C, and the sealing speed was 49 m / sec. Comparative Example 3 The results are shown in Table 3.

[0122] [Comparative Example 5] Measurements and evaluations were performed in the same manner as in Comparative Example 4, except that the heating temperature of the side seal was 170° C. and the heating temperature of the bottom seal was 150° C. The results are shown in Table 3.

[0123] [Comparative Example 6] Measurements and evaluations were performed in the same manner as in Example 1, except that material 5 was used for packaging bag 10, the heating temperature for the side seal was 170° C., the heating temperature for the bottom seal was 167° C., and the sealing speed was 49 m / sec. The results are shown in Table 3.

[0124] [Comparative Example 7] Measurements and evaluations were performed in the same manner as in Example 1, except that material 6 was used for the packaging bag 10, the heating temperature for the side seal was 230° C., the heating temperature for the bottom seal was 250° C., and the sealing speed was 27 m / sec. The results are shown in Table 3.

[0125] [Table 1]

[0126] [Table 2]

[0127] [Table 3]

[0128] As shown in Tables 1 and 2, the test specimens in which resin layers 10B and 10C were provided on both sides of a paper layer 10A and a sheet roll 20 was caramel-packaged in a packaging bag 10 with a paper component ratio of 45% or more showed good side seal adhesion, side seal roll adhesion, bottom seal adhesion, bottom seal roll adhesion, and packaging bag tearing (Examples 1 to 7).

[0129] In response to this, From Tables 1 and 3, Test specimens using packaging bags in which only resin layer 10B was provided on one side of paper layer 10A, and test specimens using packaging bags in which packaging bag 10 was constructed only from paper layer 10A, showed poor at least one of the adhesion of the side seal, the roll adhesion of the side seal, the adhesion of the bottom seal, the roll adhesion of the bottom seal, and packaging bag tearing (Comparative Examples 1 to 7).

[0130] These results show that the deterioration of packaging performance can be suppressed by using a packaging bag for caramel packaging a sheet, which has a paper layer containing paper components and a resin layer containing thermoplastic resin provided on both sides of the paper layer, and in which the ratio of paper components in the packaging bag is 45% or more.

[0131] Although an embodiment of the present invention has been described above, the present invention is not limited to a specific embodiment, and various modifications and changes are possible within the scope of the invention described in the claims. [Explanation of symbols]

[0132] 100 Sheet packaging 10 packaging bags 10A paper layer 10B, 10C resin layer 11 Top 12 Bottom 13, 14 Side 15, 16 Wife Face 20 sheet rolls 21 Long Sheet 21A Circumferential surface 21B, 21C side 22 Hollow Core 30, 40 Seal part (side seal) 50 Seal part (bottom seal) OP Opening 30, 40 Seal part (side seal) 50 Seal part (bottom seal) L1 Length L2 Roll width W1 width W2 roll diameter H1 Height

Claims

1. A packaging bag for caramel packaging a sheet, A paper layer including a paper component; and a resin layer including a thermoplastic resin provided on both sides of the paper layer, The ratio of the paper component in the packaging bag is 45% or more, The basis weight of the paper layer is 10 g / m 2 or more and 35 g / m 2 or less. packaging bag.

2. The paper layer is formed of kraft paper or rayon paper. The packaging bag according to claim 1.

3. The thickness of each of the resin layers is 5 μm or more and 40 μm or less. The packaging bag according to claim 1 or 2.

4. The thermoplastic resin is low density polyethylene. The packaging bag according to any one of claims 1 to 3.

5. The longitudinal tear strength is 70 mN or more and 350 mN or less, The transverse tear strength is 250 mN or more and 950 mN or less. The packaging bag according to any one of claims 1 to 4.

6. The softness in the longitudinal direction is 90 mN / 100 mm or more and 800 mN / 100 mm or less, The lateral softness is 40 mN / 100 mm or more and 330 mN / 100 mm or less. The packaging bag according to any one of claims 1 to 5.

7. A method for producing the packaging bag according to any one of claims 1 to 6, A welding step of heat-welding the sealed portion of the packaging bag, The heating temperature in the welding step is 120° C. or higher and 180° C. or lower. A method for manufacturing packaging bags.

8. The seal strength is 0.2 kN / m or more and 0.5 kN / m or more. A method for producing the packaging bag according to claim 7.

9. The packaging bag according to any one of claims 1 to 6, A sheet contained in the packaging bag. Sheet packaging.

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