Laminate for outer bag, outer bag and packaging

Abstract

To provide an outer packaging bag laminate for preventing a bag from being broken due to movement of a packaged article stored inside an outer packaging bag by improving a non-slip property of a surface itself, the surface of the outer packaging bag coming into contact with the packaged article according to the present invention; and to provide the outer packaging bag and a package thereof.SOLUTION: According to the present disclosure, there is provided an outer packaging bag laminate 10 for storing a plurality of packaged articles, the outer packaging bag laminate 10 comprising at least a paper base material layer 11 and a non-slip layer 12 from outside. The above-described problem is solved by the fact that a static friction coefficient defined in JIS P8147 (2010) between the packaged articles C each and the non-slip layer 12 is 0.40 or more and 0.80 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminate for an outer bag, an outer bag, and a package. [Background technology]

[0002] Traditionally, in order to preserve the characteristics and quality of food ingredients, multiple individual packaging bags wrapped in plastic film have been used as primary packaging materials, and these bags are then placed together in a larger pillow-shaped plastic outer bag.

[0003] The pillow-shaped packaging bag is a pillow-shaped packaging bag that is made by heat-welding both ends of a single piece of film to form a seam and make it cylindrical, and then heat-welding the ends at regular intervals in a direction intersecting the seam to form edge seals and then cutting.

[0004] Patent Document 1 discloses a pillow-shaped packaging bag using a laminated film in which a sealant layer is laminated on one side of a stretched film.

[0005] Incidentally, plastic packaging bags are excellent in terms of film strength, etc., but due to growing environmental concerns in recent years, there is a trend to avoid the use of plastic films, and there is a demand for the development of paper packaging bags. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-1372 Summary of the Invention [Problem to be solved by the invention]

[0007] However, because paper packaging bags are weaker than plastic packaging bags, there is a risk that the bags may break due to the movement of the packaged items contained inside the outer bag during the process of filling, storing, transporting, and using the packaged items.

[0008] The present disclosure has been made in consideration of such problems, and aims to provide a laminate for outer bags, an outer bag, and a package that prevents the bag from being broken due to the shifting of the packaged items contained in the outer bag by improving the anti-slip performance of the surface of the outer bag itself that comes into contact with the packaged items. [Means for solving the problem]

[0009] That is, the laminate for outer bags according to one embodiment is a laminate for outer bags for storing multiple packaged items, and the laminate for outer bags comprises at least a paper base material and an anti-slip layer from the outside, and the static friction coefficient between the anti-slip layer and the outer layer of the packaged items as defined in JIS P8147 (2010) is 0.40 or more and 0.80 or less.

[0010] Moreover, an outer bag according to one embodiment is obtained by overlapping the laminate for outer bags so that the anti-slip layer faces inside, and forming the laminate into a bag.

[0011] Moreover, a package according to one embodiment is formed by filling the packaged item in the outer packaging bag. [Effects of the Invention]

[0012] According to the present disclosure, a laminate for outer bags, an outer bag, and a package are provided that prevent the bag from being broken due to the movement of the packaged items contained in the outer bag by improving the anti-slip performance of the surface of the outer bag that comes into contact with the packaged items. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing the layer structure of a laminate 10 for outer packaging bags according to this embodiment. [Figure 2] FIG. 2 is a front view of the outer bag 20 according to this embodiment. [Figure 3] FIG. 3 is a front view of a package 30 according to this embodiment. [Figure 4] FIG. 4 is a cross-sectional view of the package 30 taken along line II in FIG. [Figure 5] FIG. 5 is an explanatory development view showing the laminate 10 for outer packaging bags that constitutes the outer packaging bag 20 according to this embodiment. [Figure 6] FIG. 6 is a development view showing a laminate 10 for outer packaging bags constituting an outer packaging bag according to Comparative Example 1. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment will be described below with reference to the drawings. Figures 1 to 5 show one embodiment. Each of the drawings shown below is a schematic representation. Furthermore, the numerical values ​​such as dimensions of each member and the names of materials described in this specification are examples of an embodiment, and are not limited to these, and can be selected and used as appropriate.

[0015] Furthermore, the shapes and geometric conditions used in this specification, such as terms like "parallel," "orthogonal," and "identical," as well as length and angle values, are not to be construed as being limited to their strict meanings, but rather as including a range within which similar functions can be expected.

[0016] First, the laminate 10 for outer packaging bags will be described.

[0017] The laminate 10 for outer packaging bags with improved anti-slip properties of the present disclosure is a paper laminate for outer packaging that is intended to be able to suppress inadvertent movement of the packaged item C enclosed inside the bag when it is made.

[0018] As used herein, improving the anti-slip properties means making the surface of the laminate for outer bags 10 less slippery by increasing the frictional force generated on the surface. In the examples, the static friction coefficient was used as a measurement index for objectively evaluating the improvement in anti-slip properties.

[0019] As shown in Fig. 1, the laminate 10 for outer bags has an outer surface 13 and an inner surface 14. The inner surface 14 is the surface that comes into contact with the packaged item C, and the outer surface 13 is the surface that is located opposite the inner surface 14. The laminate 10 for outer bags comprises a paper base layer 11 that is located on the outer surface 13 side, and an anti-slip layer 12 that is located on the inner surface 14 side. In the present application, not only the surface of the laminate 10 for outer bags but also the surfaces of each layer will be referred to as the inner surface, with the surface that is located on the storage section 23 side of the outer bag 20 being the inner surface, and the surface that is located opposite the inner surface being the outer surface.

[0020] Furthermore, by forming an anti-slip layer 12 on the inner surface 14 of the outer bag laminate 10, which is located on the side that comes into contact with the packaged item C, it is possible to suppress inadvertent movement of the packaged item C inside the outer bag 20 during the filling and joining processes of the packaged item C. Furthermore, it is possible to prevent damage to the packaged item C caused by the packaged item C shaking inside the outer bag 20 during transportation.

[0021] For this reason, it is essential for the anti-slip layer 12 (inner surface 14) of the laminate 10 for outer bags to control the anti-slip properties when it is brought into close contact with the outer layer of the packaged item C. In a measurement method based on the inclination method specified in JIS P8147 (2010), the static friction coefficient when the anti-slip layer 12 of the laminate 10 for outer bags and the outer layer of the packaged item C are brought into close contact must be 0.40 or more and 0.80 or less, and preferably in the range of 0.40 or more and 0.60 or less. By falling within this range, it is possible to suppress inadvertent movement of the packaged item C within the outer bag 20, and to prevent damage to the packaged item C caused by shaking of the packaged item C within the outer bag 20 during transportation. On the other hand, if the static friction coefficient is less than 0.40, the packaged item C may be more likely to move within the outer bag 20 due to vibration, etc., which may damage the packaged item C. On the other hand, if the static friction coefficient exceeds 0.8, when multiple packaged items C are filled into the outer bag 20, the packaged items C may not slide easily against the inner surface 14 of the outer bag 20, which may reduce the filling efficiency of the packaged items C.

[0022] Furthermore, in a measurement method based on the tilt method specified in JIS P8147 (2010) described below, the static friction coefficient when the anti-slip layer 12 of the outer bag laminate 10 is brought into close contact with a stainless steel plate that has been fine-buffed is preferably 0.25 or more and 0.80 or less, more preferably 0.29 or more and 0.60 or less. By falling within the above range, the outer bag laminate 10 is less likely to shift position during the process of filling the packaged item C or the process of joining the outer bag. If the static friction coefficient is less than 0.25, the outer bag laminate 10 is too slippery, and the packaged item C is more likely to shift position. If the static friction coefficient of the outer bag laminate 10 exceeds 0.8, the slipperiness and releasability against metal guide plates and the like of the filling and packaging machine may decrease, resulting in a higher rate of defects such as clogging.

[0023] Next, each layer constituting the laminate 10 for outer packaging bags will be described in order.

[0024] The non-slip layer 12, which comes into contact with the packaged item C, is formed on the inner surface 14 of the paper base layer 11 in order to provide an appropriate frictional force to the surface when the laminate for outer packaging bags 10 is formed. Furthermore, the non-slip layer 12 may have adhesive properties in order to improve adhesion between the inner surfaces. The non-slip layer 12 may be a single layer or a multi-layer.

[0025] The anti-slip layer 12 used in this embodiment is a layer with anti-slip properties. The anti-slip layer 12 may also be a layer that provides adhesive properties. Specifically, coating films made of resins such as ionomer resins, propylene-α-olefin random copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene-methacrylic acid copolymers, ethylene-α-olefin copolymers polymerized using a metallocene catalyst, ethylene-methyl methacrylate copolymers, ethylene-propylene copolymers, methylpentene polymers, polybutene polymers, acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, polyvinyl acetate resins, poly(meth)acrylic resins, and polyvinyl chloride resins can be used. Ionomer resins, in particular, can improve anti-slip performance due to the increased polar groups present on their surfaces.

[0026] The amount of the anti-slip layer 12 applied per side of the paper substrate layer 11 is 1.0 g / m in terms of solid content. 2 More than 5.0g / m 2 Preferably, it is 1.5 g / m or less. 2 More than 4.5g / m 2 Within the above range, the anti-slip performance can be improved and sufficient heat seal strength can be ensured.

[0027] In the outer bag 20 of this embodiment, the anti-slip layer 12 can be provided on the inner surface 14 side of the paper base layer 11 in a solid pattern or in a line or dot pattern, for example. In particular, when the anti-slip layer 12 is in a solid pattern, the adhesiveness of the surface of the inner surface 14 increases, thereby improving the anti-slip performance.

[0028] A non-slip varnish layer can be formed on the non-slip layer 12 to improve the anti-slip properties. This allows the static coefficient of friction between the inner surface 14 of the laminate 10 for outer bags and the packaged item C, as described below, to be maintained at 20°C to 60°C when they are brought into close contact. For example, acrylic resins, urethane resins, etc. can be used as the non-slip varnish layer, and fine particles may also be added.

[0029] Examples of the fine particles include silica, aluminum hydroxide, talc, calcined clay, calcium carbonate, activated alumina, apatite, etc. One or more of these may be added in an amount of 1% by mass or more.

[0030] In the above, general additives that can be used include, for example, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, antistatic agents, lubricants, antiblocking agents, colorants such as dyes and pigments, and others. Furthermore, modifying resins and the like can also be used.

[0031] The anti-slip layer 12 does not need to be provided on the entire surface of the paper substrate layer 11, but may be provided only on the areas where anti-slip properties are desired.

[0032] By subjecting the non-slip layer 12 of the laminate 10 for outer bags to a corona treatment, the laminate is improved in anti-slip properties. By subjecting the non-slip layer 12 to corona treatment, the surface of the non-slip layer 12 is roughened and the polar groups present on the surface are increased. Therefore, it is believed that the frictional force increases as the surface of the laminate is modified.

[0033] The method for coating the anti-slip layer 12 is not particularly limited, and a commonly used coating device can be used. For example, various coating devices can be used, such as an air knife coater, blade coater, gravure coater, rod blade coater, roll coater, reverse roll coater, bar coater, curtain coater, die slot coater, champlex coater, metering blade type size press coater, short dwell coater, spray coater, gate roll coater, and lip coater. Of these, a gravure coater is preferred.

[0034] The adhesive layer 21 is a layer for imparting adhesiveness to the inner surface 14 side of the paper base layer 11 in the joint portions 24 (24A, 24B), as shown in Fig. 4. In other words, the adhesive layer 21 is a layer to be used in the portion to be sealed 22 of the laminate 10 for outer packaging bags when a material having no adhesiveness is used for the anti-slip layer 12. Specifically, coating films made of resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, unstretched polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-α-olefin copolymer polymerized using a metallocene catalyst, polypropylene, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, polyvinyl acetate resins, poly(meth)acrylic resins, and polyvinyl chloride resins can be used.

[0035] In the edge seal portion 25 (26), the amount of the adhesive layer 21 applied is 1 g / m2 in terms of solid content per side of the paper base layer 11. 2 More than 5g / m 2 Less than 1.5 g / m is preferred 2 More than 4.5g / m 2The following is more preferable: Within the above range, sufficient heat seal strength can be ensured.

[0036] In the outer bag 20 of this embodiment, the adhesive layer 21 is provided on the inner surface of the paper base layer 11 in a solid pattern or in a line or dot pattern, for example.

[0037] Various types of paper can be used for the paper base layer 11, such as one-sided glossy paper, strong sizing bleached paper, strong sizing unbleached paper, pure white roll paper, kraft paper, paperboard, processed paper, etc. One-sided glossy paper has a glossy surface with a high gloss on one side, and the surface opposite to the glossy surface (the glossy surface) has a lower density than the glossy surface side.

[0038] There is no limitation on the basis weight of the paper base layer 11 used in this embodiment, but the basis weight is 30 g / m 2 More than or less than 100g / m 2 The following ranges are preferred: Within the above ranges, the bag has adequate strength and excellent processability, and the bag can easily accommodate the packaged item C after it has been made.

[0039] The printed layer 18 is formed on a part of or the entire surface of the outer surface 13 of the paper base material layer 11 as required, for the purpose of enhancing the design of the laminate 10 for outer bags. The printed layer 18 may be a single layer, or may be formed from two or more layers.

[0040] The printed layer 18 is preferably formed on substantially the entire surface of the paper base layer 11. By forming the printed layer 18 on substantially the entire surface of the paper base layer 11, it becomes easier to homogenize the appearance (texture) from the outer layer side of the outer bag laminate 10. "Substantially the entire surface" means 80% or more of the area of ​​the paper base layer 11, preferably 90% or more, and more preferably 99% or more.

[0041] The printing layer 18 can be formed by multi-color printing using the process colors of cyan, magenta, yellow, and black, as well as white, or by multi-color printing using spot colors, in which plates of the individual colors that make up the image are prepared.

[0042] The method for printing the printing layer 18 is not particularly limited. For example, the printing layer 18 can be formed by gravure printing. Gravure printing is a printing method in which the ink-receiving portions of the master plate are engraved in recesses, and the ink comes out of these recesses, so the color density can be adjusted by the depth and size of the recesses and the pressure of the recesses on the printing layer 18. A gravure printing machine has one printing unit for each color and is excellent at reproducing images with gradations, such as photographs.

[0043] For the printing layer 18, one or more types of ordinary ink vehicles are prepared from a resin and a solvent, and if necessary, one or more types of auxiliary agents such as plasticizers, stabilizers, antioxidants, light stabilizers, UV absorbers, curing agents, crosslinking agents, lubricants, antistatic agents, fillers, and the like are optionally added to the ink, and further, a colorant such as a dye or pigment is added, and the ink composition is prepared by thoroughly kneading with a solvent, a diluent, etc., and can be used.

[0044] Such ink vehicles can be any of the well-known types, such as linseed oil, tung oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin-modified resin, shellac, alkyd resin, phenolic resin, maleic acid resin, natural resin, hydrocarbon resin, polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic resin, methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, aminoalkyd resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, and others, and can be used alone or in combination. The ink vehicle transports the colorant from the plate to the substrate and fixes it as a coating.

[0045] In addition, the drying speed of ink varies depending on the solvent. The main solvents used in printing inks are toluene, MEK, ethyl acetate, and IPA, and solvents with low boiling points are used to dry quickly. If the ink dries too quickly and the printed material rubs off or does not print well, a solvent with a high boiling point can be mixed in appropriately. This allows even small characters to be printed clearly. Colorants include dyes that dissolve in solvents and pigments that do not dissolve in solvents. Pigments are used in gravure inks. Pigments can be inorganic or organic. Inorganic pigments include titanium oxide (white), carbon black (black), and aluminum powder (gold and silver), while azo-based pigments are preferably used as organic pigments.

[0046] Although the above description is based on gravure printing, other printing methods such as offset printing, inkjet printing, relief printing, screen printing, transfer printing, flexographic printing, and the like may also be used.

[0047] Next, the outer bag 20 according to this embodiment will be described with reference to FIG.

[0048] The outer bag 20 according to this embodiment is a packaging bag formed by heat sealing or the like from the outer bag laminate 10. The packaging form is not limited to the pillow seal type shown in Fig. 2, and various types of packaging bags can be made by folding the outer bag laminate 10 in half, or by preparing two outer bag laminates 10, stacking them with the surfaces of the anti-slip layers 12 facing each other, and joining the peripheral edges in a form such as a standing pouch type, side seal type, two-sided seal type, three-sided seal type, four-sided seal type, envelope seal type, pleated seal type, flat bottom seal type, square bottom seal type, or gusset type.

[0049] 2, the pillow-shaped outer bag 20 includes an edge seal portion 26 of the lower portion 16, a portion to be sealed 22 that will become the edge seal portion of the upper portion 15 facing the edge seal portion in a first direction D1, and a seam portion 24 that extends along the first direction D1 from the edge seal portion 26 of the lower portion 16 to the opening of the upper portion 15 and joins the inner surfaces of the outer bag laminate 10. The first direction D1 is the conveyance direction of the outer bag laminate 10 when producing the outer bag 20 from the outer bag laminate 10, and is known as the MD (Machine Direction). A second direction D2 that is perpendicular to the first direction D1 is known as the TD (Transverse Direction). These seal portions form a storage portion 23 inside the outer bag 20 in which the packaged item C is stored, and are configured to seal the portion to be sealed 22 of the outer bag 20. Although not shown, the outer bag 20 may have an opening start portion such as a notch in the gable portion 24 and the edge seal portion 26. The notch may be a V-shaped cutout or a slit.

[0050] Furthermore, the outer bag 20 has a seam 24 formed by overlapping the inner surfaces (the surfaces facing the packaged article C) of one outer bag laminate 10 on the back surface 32. This seam 24 is joined by an adhesive layer 21. The joint portion 24 is formed to protrude from the back portion 32. In this embodiment, as shown in Fig. 2, the joint portion 24 is tilted to the right (second direction D2) and overlaps the second back portion 32B located on the right side of the joint portion 24. However, this is not limited thereto, and the joint portion 24 may also be tilted to the left (second direction D2) and overlap the first back portion 32A located on the left side of the joint portion 24 (not shown). In this embodiment, for ease of understanding, the left side (second direction D2) of the palm portion 24 of the rear portion 32 will be referred to as the first rear portion 32A, and the right side will be referred to as the second rear portion 32B, as necessary.

[0051] The seam 24 is formed on the back surface 32 of the outer bag 20, and joins the longitudinal (first direction D1) edges of the laminate 10 for outer bags together so that the inner surfaces of the outer bags 20 overlap each other (seamless joining).

[0052] As shown in FIG. 2, the joining portion 24 is provided from the upper portion 15 to the lower portion 16 along the longitudinal direction (first direction D1) of the outer packaging bag 20.

[0053] 2, the upper portion 15 is provided with an upper portion to be sealed 22 extending along the upper portion 15, and the lower portion 16 is provided with a lower edge seal portion 26 extending along the lower portion 16. The lower edge seal portion 26 joins the inner surfaces of the outer packaging bag laminate 10 to form a front portion 31 and a back portion 32. In this embodiment, in the front portion 31 and the back portion 32, an anti-slip layer 12 is provided on one side of a paper base layer 11, which will be described later.

[0054] Here, before the packaged item C is placed in the storage section 23, the opening of the upper part 15 of the outer bag 20 becomes the portion to be sealed 22 in an unsealed state. In this embodiment, for example, before the packaged item C is placed in the storage section 23, the upper part 15 of the outer bag 20 becomes the portion to be sealed 22. After the packaged item C is placed in the storage section 23, the portion to be sealed 22 is joined to form an edge seal portion 25 of the upper part 15, and the packaged item C is hermetically sealed in the outer bag 20.

[0055] As shown in Figure 4, when viewed from the bottom (lower part 16 side), the seam portion 24 of the outer bag 20 located at the back part 32 of the outer bag 20 is joined via an adhesive layer 21 so that the first seam portion 24A and the second seam portion 24B overlap with each other on the inner surfaces of the outer bag 20. It is to be noted that the adhesive layer 21 does not necessarily have to be formed up to the tip end 27 of the joint portion 24 in the lateral direction (second direction D2).

[0056] That is, in this embodiment, as shown in FIG. 4, in the horizontal direction (second direction D2), the folded portion (base) 28 side of the joint portion 24 (first joint portion 24A, second joint portion 24B) needs to be joined with the adhesive layer 21, but it does not have to be joined all the way to the tip portion 27 side. In this application, the area from the center 29 of the joint portion 24 to the tip 27 is referred to as the "tip side," and the area from the center 29 to the folded portion 28 is referred to as the "folded portion side."

[0057] FIG. 5 is a development view showing the laminate 10 for outer packaging bags that constitutes the outer packaging bag 20 of FIG. As shown in FIG. 5, the adhesive layer 21 of the joint portion 24 does not have to extend to the first tip portion 27A and the second tip portion 27B as long as it is provided on the first folded portion 28A side and the second folded portion 28B side.

[0058] 3 and 4, this laminate 10 for outer bags is processed into a package 30, which is an outer bag 20 for packaged items C. The package 30 is provided with edge seal portions 25, 26 and a back seal portion 21, which are joined together to form a bag. Thus, a plurality of items C are enclosed and packaged inside the outer bag 20.

[0059] The packaged item C is a so-called small pouch product, which is an inner bag made of a laminated film for inner bags, filled with appropriate contents, and sealed. The laminated film for an interior bag has, from the outside, at least a base film layer and a heat seal layer. The laminated film for an interior bag may have an intermediate layer between the base film layer and the heat seal layer. Alternatively, the layers may be laminated via an adhesive layer.

[0060] The base film layer is the outer layer of the laminated film for interior bags, and is the layer on the side that comes into contact with the anti-slip layer 12 of the laminated body 10 for exterior bags. The base film layer may be made of a plastic film such as polypropylene, polyethylene, polyester, polyamide, etc. The plastic film may be uniaxially or biaxially oriented.

[0061] Furthermore, examples of materials constituting the heat seal layer include polyolefin resins such as low-density PE (LDPE), linear low-density PE (LLDPE), medium-density PE (MDPE), high-density PE (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene block copolymer, and ethylene-propylene random copolymer, and one or more of these resins can be used.

[0062] The intermediate layer may be provided with a barrier layer for suppressing the permeation of oxygen gas, water vapor, etc. Examples of materials constituting the intermediate layer include a vapor-deposited film containing an inorganic oxide, a metal foil, and the like.

[0063] The contents include, for example, food. Examples of food include oily foods such as snacks and chocolate confectionery, and dried foods. However, the contents are not limited to confectionery and can include various items such as electronic components.

[0064] Next, an example of a method for manufacturing the laminate 10 for outer packaging bags will be described.

[0065] As shown in FIG. 1, first, the above-described paper base layer 11 is prepared. Next, if necessary, a printed layer 18 is formed on the outer surface 13 of the paper base layer 11, and then an anti-slip layer 12 is formed on the inner surface of the paper base layer 11. As shown in FIG. 5, for example, the paper base layer 11 may be coated only on the first folded portion 28A (or the second folded portion 28B) side of the paper base layer 11, excluding the first leading end 27A of the first gable portion 24A of the gable portion 24 (or the second leading end 27B of the second gable portion 24B). The flow direction of the paper base layer 11 corresponds to the first direction D1 shown in FIG. 5. In this way, an outer bag laminate 10 can be obtained, which includes at least the printed layer 18, the paper base layer 11, and the anti-slip layer 12, in that order from the outer surface 13 to the inner surface 14.

[0066] As shown in Fig. 2, the outer packaging bag 20 is formed by making the outer packaging bag laminate 10 into a bag by heat sealing or the like. The sealed portion includes a seam portion 24 and an edge seal portion 26. The outer packaging bag 20 forms a storage portion 23 surrounded by the seam portion 24 and the edge seal portion 26, and is configured to seal the outer packaging bag 20.

[0067] According to this embodiment, the laminate 10 for outer bags has an anti-slip layer 12 formed on the inner surface 14 side that is located on the side that comes into contact with the packaged item C, improving the anti-slip performance of the surface of the outer bag 20 that comes into contact with the packaged item C. This makes it possible to prevent the bag from being broken due to the movement of the packaged item C contained in the outer bag 20. It also makes it possible to prevent damage to the packaged item C that would result from the packaged item C shaking inside the outer bag 20 during transportation. [Example]

[0068] Next, specific examples of the above-described embodiment will be described, but the present disclosure is not limited to the descriptions of the following examples as long as they do not depart from the gist of the disclosure.

[0069] Example 1 As the paper base layer 11, basis weight: 70 g / m 2 A printing layer 18 was formed on the glossy side of a single-sided glossy paper ("OK Blizzard" manufactured by Oji Paper Co., Ltd.) by multi-color gravure printing using printing inks in a thickness of 2 μm or less, including cyan, magenta, yellow, and black process colors, as well as white. Next, a water-based ionomer emulsion (product name: Chemipearl S-500, manufactured by Mitsui Chemicals, Inc., composition: metal salt of ethylene-methacrylic acid copolymer, self-emulsifying emulsion) was gravure coated onto the surface (smooth surface) of the paper substrate layer 11 obtained above, different from the glossy surface on which the printed layer 18 was formed, to form the anti-slip layer 12. The dry coating amount of the anti-slip layer 12 was 3.5 g / m. 2 It was. That is, as shown in Fig. 5, while the paper base layer 11 was being conveyed in the flow direction, the paste was applied to the entire surface of the paper base layer 11, excluding a 3 mm width from each of the first leading end 27A of the first girder 24A and the second leading end 27B of the second girder 24B, in the planned area of ​​the girder 24 (width W dimension: 15 mm). After that, it was dried to produce the laminate 10 for outer packaging bags shown in Fig. 1. The laminate 10 for outer packaging bags in Example 1 had a print layer 18, a paper substrate layer 11, and an anti-slip layer 12 in this order. The dry coating amount of the anti-slip layer 12 was 3.5 g / m 2 It was.

[0070] Example 2 In Example 1, the dry coating amount of the anti-slip layer 12 was 2.0 g / m 2 The laminate for outer packaging bags 10 of Example 2 shown in FIG. 5 was produced in the same manner as in Example 1, except for the above change.

[0071] (Comparative Example 1) The laminate 10 for outer packaging bags of Comparative Example 1 shown in Figure 6 was produced in the same manner as in Example 1, except that the adhesive layer 21 was applied to the spine seal portion and the end seal portion. The adhesive layer 21 was formed by applying an aqueous ionomer emulsion (product name: Chemipearl S-500, manufactured by Mitsui Chemicals, Inc., composition: metal salt of ethylene-methacrylic acid copolymer, self-emulsifying emulsion) by gravure coating. The dry coating amount of the adhesive layer 21 was 3.5 g / m 2 It was.

[0072] [Measurement of static friction coefficient] To evaluate the slipperiness, measurements were carried out according to the tilt method described in JIS P8147 (2010). A static friction coefficient measuring device was used. The laminate 10 for outer bags described in Examples 1 and 2 and Comparative Example 1 was cut into a size of 100 mm in the MD direction and 240 mm in the TD direction. The laminate 10 for outer bags cut into a size of 100 mm width x 240 mm length was fixed to a static friction coefficient measuring device that satisfies the inclination method of JIS P8147 (2010) so that the inner surface 14 side (X) of the laminate 10 for outer bags was the measurement surface without deflection. Next, a laminate film for an interior bag used for the stored item C was prepared. The layer structure was a biaxially oriented polypropylene film (Mitsui Chemicals Tohcello, Inc., product name U-1, thickness 20 μm) and an unoriented polypropylene film (Toyobo Co., Ltd., product name P1128, thickness 20 μm) bonded together with a two-component curing adhesive. The interior bag laminate film was then cut into a 30 mm width in the MD direction and a 80 mm length in the TD direction. Then, with the biaxially oriented polypropylene film side (Y) as the measurement surface, a 30 mm width x 40 mm length x 30 mm height weight weighing 200 g was fixed to cover the entire measurement surface. After the non-slip layer 12 of the exterior bag laminate 10 and the piece of interior bag laminate film were in close contact with each other, they were inclined on the inclined surface of a friction tester. The static friction coefficient was calculated from the angle of the inclined surface at the time the weight began to move. The measurements were taken three times, and the average values ​​were calculated to two decimal places and compared. The slipperiness was evaluated as follows: a static friction coefficient of 0.40 or more and 0.80 or less was marked ○, and any other values ​​were marked ×.

[0073] Next, the laminate 10 for outer bags described in Examples 1 and 2 and Comparative Example 1 serving as a sample was attached to a moving block serving as a weight having a width of 60 mm, a length of 100 mm, and a mass of 1000 g so that the inner surface 14 side (X) became the measurement surface. Then, the sample was attached to a static friction coefficient measuring machine so that the side (Z) of a fine buffed stainless steel plate (SUS304 plate) became the measurement surface, and the moving block with the sample laminate 10 for outer bags attached was placed on the steel plate.

[0074] In the static friction coefficient measuring device, the sliding slope was changed while the steel plate was tilted at a rate of 2.0° / sec, and the angle θ when the moving block began to slide was read. The value of tan θ (i.e., the static friction coefficient) was calculated from this angle θ. The static friction coefficient measurement method was performed in accordance with the tilt method of JIS P8147 (2010). The measurements were taken three times, and the average values ​​were calculated to two decimal places and compared. The slipperiness was evaluated as follows: a static friction coefficient of 0.25 or more and 0.80 or less was marked ○, and any other values ​​were marked ×.

[0075] [Packaging aptitude test] Both ends of the laminate 10 for outer bags described in Examples 1 and 2 and Comparative Example 1 were heat-sealed and bonded together to form a seam 24 and form a cylindrical shape, and then the laminate was heat-sealed at regular intervals in a direction intersecting the back seal 21 to form a lower edge seal 26, and then cut to produce outer bags 20 having a length of 250 mm (first direction D1) and a width of 350 mm (width of front portion 31: 160 mm, width of first back portion 32A: 80 mm, width of second back portion 32B: 80 mm, width of first seam: 15 mm, width of second seam: 15 mm).

[0076] Next, for the packaged item C to be filled into the exterior bag 20 described in Examples 1 and 2 and Comparative Example 1, an individually packaged product was used, in which chocolate confectionery (one piece, approximately 10 g per piece) was enclosed as the contents in a small pouch made of biaxially oriented polypropylene / unoriented polypropylene film, which was 8.0 cm in the vertical direction and 4.0 cm in the horizontal direction when unfilled. A total of 10 of these packaged items were filled into each of the exterior bags 20 described in Examples 1 and 2 and Comparative Example 1, and the opening of the package was sealed using a heat sealing machine to produce package 30.

[0077] The package 30 was held by hand and shaken vertically with a swing amplitude of 20 cm, twice per second, a total of 30 times, and the number of outer bags 20 that broke was counted. The evaluation was carried out on 10 packages 30, and the evaluation was based on the following criteria: 0 broken bags was marked with a ◎, 1 broken bag was marked with a ○, and 2 or more broken bags were marked with an ×.

[0078] [Integration Aptitude Test] In the automatic packaging process of the actual bag making machine, if the accumulated packaged items C shifted during movement or when storing the packaged items C in the outer bag 20, causing them to break inside the outer bag 20 or making it impossible to package, the evaluation was based on the criteria of ×, and if there was no problem, ○.

[0079] Next, Table 1 shows the results of static friction force measurements (average values) and packaging suitability tests for Examples 1 and 2 of this embodiment and Comparative Example 1. In Table 1, XY and ZX respectively indicate the combinations of the surfaces that were brought into close contact.

[0080] [Table 1]

[0081] As can be seen from Table 1, Examples 1 and 2 of this embodiment were evaluated as ◯ or better in all items, whereas Comparative Example 1 was evaluated as × in at least one item. Therefore, the laminates 10 for outer bags according to Examples 1 and 2 in Table 1 had a static friction coefficient between the anti-slip layer 12 and the packaged item C in the range of 0.40 or more and 0.80 or less, and were therefore able to prevent bag breakage by suppressing the movement of the packaged item C contained in the outer bag 20. Furthermore, the laminates 10 for outer bags according to Examples 1 and 2 had a static friction coefficient between the anti-slip layer 12 and the fine buffed stainless steel plate in the range of 0.25 or more and 0.80 or less, and were therefore excellent in terms of the accumulation of the packaged item C in a filling and packaging machine. [Explanation of symbols]

[0082] 10. Laminate for outer packaging bag 11 Paper base layer 12 Anti-slip layer 13 Exterior 14 Inner 15 Upper 16 Lower 18 Printing layer 20 outer bag 21 Adhesive layer 22 Seal Planned Section 23 Storage area 24 Gassho section 24A 1st gassho section 24B Second gassho section 25, 26 Edge seal 27 Tip 27A 1st tip 27B 2nd tip 28 Folded section 28A First fold 28B Second fold 29 Central part 29A 1st center section 29B 2nd center part 30 Packaging 31 Surface part 32 Back surface 32A First back surface 32B Second back surface C Wrapped object D1 First direction (vertical direction) D2 Second direction (horizontal direction)

Claims

1. A laminate for outer bags used as an outer bag for storing multiple packaged items, The laminate for an outer bag comprises at least a paper substrate and an anti-slip layer from the outside, the anti-slip layer comprises a water-based ionomer emulsion; A laminate for an outer bag used as an outer bag obtained by overlapping the sheets so that the anti-slip layer is on the inside and making a bag, The outer layer of the packaged item is a biaxially oriented polypropylene film, The static friction coefficient between the anti-slip layer and the biaxially oriented polypropylene film, as defined in JIS P8147 (2010), is 0.40 or more and 0.80 or less.

2. 2. The laminate for outer bags according to claim 1, wherein the static friction coefficient between the anti-slip layer and the stainless steel plate having a fine buff polishing finish, as defined in JIS P8147 (2010), is 0.25 or more and 0.80 or less.

3. An outer bag made of the laminate for outer bags according to claim 1 or 2, The outer bag is obtained by overlapping the laminate for outer bags so that the anti-slip layer is on the inside and forming a bag.

4. A package obtained by filling the outer packaging bag according to claim 3 with the packaged item.

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