Packaging boxes and packaging

Abstract

To provide a packaging box which has excellent sealability and excellent durability, while using a packaging sheet including a paper material.SOLUTION: A packaging box 100 includes: a box body 20 having an opening part 22 formed so as to take out an object 40 to be packaged; and a lid body 30 having an adhesive part 32B adhered to a surface of the box body 20 in the periphery of the opening part 22 and a non-adhesive part 32A provided closer to the center than the adhesive part 32B and for covering the opening part 22, and sealing the opening part 22. The box body 20 includes a reinforcement film 25 constituted by a packaging sheet 10 including a paper material, and adhered to a surface of the packaging sheet at an inner edge part 24 surrounding the opening part 22. The packaging box 100 is provided in which the lid material 30 is attached to the reinforcement film 25 and seals the opening part 22 in such a manner that a boundary 32C between the adhesive part 32B and the non-adhesive part 32A at the lid material 30 is positioned on the reinforcement film 25.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a packaging box and a package.

Background Art

[0002] As a packaging container for containing an object to be packaged, a plastic packaging bag is known. For example, in Patent Document 1, a packaging body is disclosed which has a packaging bag for storing wet tissues and having an opening for taking out the wet tissues, and an opening and closing label that is detachably adhered around the opening. It has been proposed to provide a reinforcing label formed of a PET resin at a portion of the packaging bag constituting this package to which the opening and closing label is adhered.

[0003] In Patent Document 2, in a packaging bag in which a reinforcing sheet is adhered to the outer peripheral side of the take-out opening of a bag body for packaging contents such as a wet sheet, and a sealing label for sealing the take-out opening is detachably adhered onto the reinforcing sheet via a pressure-sensitive adhesive, it has been proposed to provide a reinforcing embossed portion on the reinforcing sheet.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Replacing even a portion of plastic containers with paper ones can reduce waste and promote the efficient use of resources. However, in packaging containers such as those described in Patent Documents 1 and 2, where opening / closing labels or sealing labels are repeatedly peeled off and reattached, large peeling stresses are repeatedly generated at the points where the labels are attached. For this reason, it has been difficult to maintain sufficient durability when using packaging sheets containing paper.

[0006] Therefore, this disclosure provides a packaging box that has excellent airtightness and excellent durability, even while using a packaging sheet containing paper material, and a packaging body equipped with such a packaging box. [Means for solving the problem]

[0007] This disclosure provides a packaging box comprising: a box body having an opening formed on one side to allow the packaged item to be removed; and a lid material that seals the opening, having an adhesive portion that adheres to the surface of the box body around the opening, and a non-adhesive portion that is provided closer to the center than the adhesive portion and covers the opening, wherein the box body is made of a packaging sheet including paper material, and has a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening, and the lid material adheres to the reinforcing film to seal the opening such that the boundary between the adhesive portion and the non-adhesive portion of the lid material is located on the reinforcing film.

[0008] The lid of this packaging box has a non-adhesive portion with lower adhesive strength than the adhesive portion. The box body is equipped with a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening. By providing such a reinforcing film, the inner edge can be reinforced. Furthermore, the lid material adheres to the reinforcing film to seal the opening, so that the boundary between the adhesive portion and the non-adhesive portion of the lid material is located on the reinforcing film. As a result, the peeling stress generated in the packaging sheet when peeling the lid material from the box body can be reduced compared to when the entire reinforcing film is adhered to the adhesive portion of the lid material. Therefore, the peeling stress generated in the inner edge to which the reinforcing film is attached is reduced, and damage to the packaging sheet at the inner edge can be suppressed. In addition, the airtightness of the packaging box can be increased compared to when the entire reinforcing film is covered by the non-adhesive portion. Thus, the above packaging box, while using a packaging sheet containing paper material, has excellent airtightness and resealability, as well as excellent durability.

[0009] When the above-mentioned packaging box is viewed in a cross-section parallel to the opening direction of the lid material and passing through the center of the opening of the box body, it is preferable that the length L1 of the adhesive-retaining portion and the length L2 of the opening satisfy the following formula (1). L1-L2≧1mm (1)

[0010] With this type of packaging box, even if the lid material covering the opening of the box is slightly misaligned, it is possible to sufficiently prevent the opening of the box from being covered by the adhesive portion of the lid material. Therefore, the adhesive portion of the lid material is less likely to adhere to the packaged item, allowing for smooth opening of the packaging box and removal of the packaged item.

[0011] The packaged items in the above-mentioned packaging box are housed in an inner bag inside the box, and it is preferable that, when viewed in a cross-section parallel to the opening direction of the lid material and passing through the center of the opening, the length L1 of the adhesive-retaining portion, the length L2 of the opening, and the length L3 of the planned opening portion of the inner bag satisfy the following formula (2). L1 > L2 ≥ L3 (2)

[0012] With this type of packaging box, the packaged items are contained in an inner bag, thus improving the airtightness of the packaged items. Furthermore, before opening the packaging box, the adhesive part of the lid material does not come into contact with the opening portion of the inner bag, and after opening the packaging box, the adhesive part of the lid material does not come into contact with the packaged items contained in the inner bag. Therefore, the packaging box can be opened smoothly, and the adhesive strength of the lid material's adhesive part can be maintained at a high level even after opening. In addition, since L1 > L2, when the lid material is peeled away from the box body to open the box, the peeling stress generated in the packaging sheet at the inner edge is reduced, and since L2 ≥ L3, contact between the packaging sheet and the packaged items can be suppressed. Therefore, damage to the packaging sheet can be sufficiently suppressed.

[0013] Preferably, the above-mentioned packaging sheet has, from the inside out, the water-resistant paper material, an adhesive layer, a base layer, and a metal film in this order. Because such a packaging sheet has water-resistant paper and a metal film, it has excellent durability against moisture and decorative properties. Furthermore, because an adhesive layer is provided between the water-resistant paper and the metal film, sufficient durability can be achieved even when peeling stress occurs repeatedly.

[0014] The adhesive layer described above is preferably composed of a cured product of an adhesive composition containing an acrylic adhesive or an epoxy adhesive. Such a cured product has excellent adhesion and water resistance. Therefore, it can maintain excellent durability even when containing a moisture-impregnated material.

[0015] The mass per unit area of ​​the above adhesive layer is 2-10 g / m². 2 This is preferable. With such an adhesive layer, the strength of the packaging sheet can be sufficiently increased. Therefore, the durability of the packaging box can be further improved.

[0016] In the above packaging box, it is preferable that the adhesive force between the surface of the packaging sheet and the reinforcing film is greater than the adhesive force between the adhesive part of the lid material and the reinforcing film. By this, the peeling stress generated in the packaging sheet at the inner edge part can be reduced. Therefore, even if the adhesion and peeling between the adhesive part of the lid material and the reinforcing film are repeated, the box body is suppressed from being damaged, and the durability of the packaging box can be improved.

[0017] In the above packaging box, it is preferable that the lid material has a pair of resin layers and a metal layer between the pair of resin layers. The lid material provided with the metal layer is excellent in decorativeness. Further, by having the metal layer between the pair of resin layers in this way, it is possible to sufficiently suppress the elution of metal components to the packaged object.

[0018] The packaged object packaged in the above packaging box preferably includes an impregnated body impregnated with at least one liquid selected from the group consisting of water, alcohol, and emulsion. Since the above packaging box has excellent airtightness, it is possible to suppress the impregnated body packaged in the packaging box from drying.

[0019] In one aspect, the present disclosure provides a package including any of the above packaging boxes and a packaged object accommodated in the packaging box. Since this package includes the above packaging box, it has excellent airtightness and excellent durability.

Effects of the Invention

[0020] It is possible to provide a packaging box having excellent airtightness and excellent durability, and a package including such a packaging box.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of a packaging box (package) according to one embodiment. [Figure 2] It is a cross-sectional view taken along line II-II of the packaging box (package) of FIG. 1. <T [Figure 3] It is a view showing an open state of the packaging box (package) of FIG. 1. [Figure 4] This diagram shows a plan view of a packaging box (packaging body) and a cross-section of the corresponding lid material. [Figure 5] This is a cross-sectional view of an example of a packaging sheet. [Modes for carrying out the invention]

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, where applicable. However, the following embodiments are illustrative for explaining the present invention and are not intended to limit the present invention to the following. In the description, the same reference numerals will be used for the same element or element having the same function, and redundant explanations will be omitted where applicable. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Moreover, the dimensional ratios of each element are not limited to the ratios shown.

[0023] The packaging box 100 in Figure 1 comprises a box body 20 having an opening 22 formed to allow the packaged item to be removed, and a lid material 30 that seals the opening 22. The box body 20 is made of a packaging sheet 10. The packaged item 200 comprises the packaging box 100 and the packaged item contained therein. When the packaging box 100 (packaged item 200) is closed, the lid material 30 is adhered to the box body 20, and the packaged item is sealed inside the packaging box 100. By grasping one end of the lid material 30 on the right and pulling the lid material 30 from right to left, the lid material 30 can be peeled off the box body 20. In this way, the packaging box 100 (packaged item 200) can be opened.

[0024] In this specification, the direction in which the lid material 30 is pulled when opening the packaging box 100 (packaging body 200) (the direction from right to left in Figure 1) is referred to as the opening direction P of the packaging box 100 (packaging body 200). The opening direction P is not limited to one direction; for example, the box body 20 may be able to be opened even if the lid material 30 is pulled from left to right. Such a packaging box (packaging body) has two opening directions.

[0025] By peeling at least a portion of the lid material 30 from the box body 20 along the opening direction P, the packaging box 100 (packaging body 200) can be opened, and the packaged items can be removed from inside the packaging box 100. The lid material 30 may be configured to allow repeated adhesion to and detachment from the packaging box 100. This allows the packaging box 100 (packaging body 200) to repeatedly switch between a closed state and an open state.

[0026] The packaging box 100 (packaging body 200) has a rectangular prism shape, but is not limited to this. For example, it may have a prism shape other than a rectangular prism, or it may be cylindrical. The shape and size of the opening 22 and the lid material 30 are also not particularly limited. It is sufficient that the lid material 30 can cover the entire opening 22.

[0027] The cross-sectional view in Figure 2 is parallel to the opening direction P and shows a cross-section passing through the center of the opening 22. The box body 20 is provided with a reinforcing film 25 attached to the surface of the packaging sheet 10 on the inner edge 24 surrounding the opening 22. The reinforcing film 25 has the function of reinforcing the inner edge 24, and by providing the reinforcing film 25, the durability of the box body 20 can be improved. The reinforcing film 25 may be, for example, a plastic film such as polyolefin or polyester with an adhesive on one side, and attached to the surface of the packaging sheet 10 with the adhesive. The reinforcing film 25 may be provided around the entire circumference of the inner edge 24 surrounding the opening 22.

[0028] The lid material 30 has a label layer 31 and an inner layer 32. The inner layer 32 has an adhesive-suppressing portion 32A in the center of the lid material 30 and an adhesive portion 32B around the adhesive-suppressing portion 32A. That is, the adhesive-suppressing portion 32A is located closer to the center of the lid material 30 than the adhesive portion 32B. The end of the adhesive-suppressing portion 32A is in contact with the reinforcing film 25, and the boundary 32C between the adhesive-suppressing portion 32A and the adhesive portion 32B is located on the reinforcing film 25. This reduces the peeling stress generated in the packaging sheet 10 when peeling the lid material 30 from the box body 20, compared to when the entire reinforcing film 25 is bonded to the adhesive portion 32B of the lid material 30. As a result, the peeling stress generated in the inner edge 24 to which the reinforcing film 25 of the box body 20 is attached is reduced, and damage to the packaging sheet 10 at the inner edge 24 can be suppressed. Furthermore, the airtightness of the packaging box 100 (packaging body 200) can be increased compared to when the entire reinforcing film 25 is covered with the adhesive-blocking portion 32A. As a result, the packaging box 100 (packaging body 200) has excellent airtightness and durability, even if the packaging sheet 10 contains paper material. In addition, high airtightness and high durability can be maintained even after repeated bonding and peeling of the lid material 30. Thus, the packaging box 100 (packaging body 200) also has excellent resealability.

[0029] Since the entire opening 22 is covered by the adhesive-blocking portion 32A, the adhesive portion 32B and the packaged item 40 do not come into direct contact when the box is closed. This prevents the packaged item 40 from sticking to the adhesive portion 32B, allowing the packaging box 100 (packaging body 200) to be opened smoothly. Furthermore, after opening and resealing, the impregnated material 44 can be removed smoothly.

[0030] The label layer 31 may have a laminated structure comprising, for example, a resin film, a metal layer, and an ink layer. Examples of resin films include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyolefin films such as polyethylene and polypropylene; polystyrene films; polyamide films such as 66-nylon; polycarbonate films; and engineering plastic films such as polyacrylonitrile films and polyimide films.

[0031] The label layer 31 may have a metal film and a resin film in that order from the inner layer 32 side. This results in a lid material 30 having a structure with a pair of resin layers (resin film and inner layer) and a metal layer (metal film) in between. Such a lid material 30 has excellent decorative properties and light-shielding properties, and can adequately protect the packaged item 40. Furthermore, because the packaged item 40 and the metal film do not come into direct contact with each other due to this structure, the leaching of metal components into the packaged item 40 can be sufficiently suppressed. The label layer 31 may be made of a metal vapor-deposited film (for example, an aluminum vapor-deposited PET film) or a metal foil laminated film.

[0032] The metal film may contain aluminum, tin, indium, nickel, copper, silver, gold, platinum, brass, chromium, or zinc, or alloys of these metals. It may contain one of these metals alone, or two or more in combination. The metal film can be manufactured, for example, by vacuum deposition, sputtering, or ion plating. Having such a metal film allows for the creation of a lid material 30 with excellent decorative properties.

[0033] Examples of components that can be included in the adhesive portion 32B are acrylic resin, rubber resin, and silicone resin. By providing such an adhesive portion 32B, the lid material 30 can be repeatedly adhered to and peeled off from the box body 20.

[0034] The adhesive-neutralizing portion 32A covering the opening 22 may be formed by performing an adhesive-neutralizing process on the adhesive portion 32B described above. By performing such an adhesive-neutralizing process, the adhesive strength can be made lower than or even eliminated from the adhesive portion 32B. For example, after providing an adhesive layer on one side of the label layer 31, an adhesive-neutralizing process may be performed only on the central part to create an adhesive-neutralizing portion 32A in the central part, with the surrounding area being an adhesive portion 32B composed of an adhesive layer. The adhesive-neutralizing process may be performed by applying varnish or the like to the adhesive layer.

[0035] The packaged product 40 comprises an impregnated body 44 impregnated with a liquid containing at least one selected from the group consisting of water, alcohol, and emulsion, and a plastic inner bag 41 for housing the impregnated body 44. Examples of the impregnated body 44 include a fibrous material impregnated with a cleaning solution or lotion (such as a wet wipe).

[0036] When the packaging 200 is unused, the impregnated material 44 is sealed inside the inner bag 41. The inner bag 41 is bonded to the inner surface of the box 20 by adhesive 52 around the opening 42. This positions the inner bag 41 inside the packaging box 100, allowing for smooth removal of the impregnated material 44. A flap label 41A is bonded to the top of the inner bag 41. The inner bag 41 is sealed, which suppresses the volatilization of volatile components contained in the impregnated material 44.

[0037] When the packaging box 100 (packaging body 200) is opened for the first time, the flap label 41A covering the opening can be removed from the inner bag 41, and the impregnated body 44 can be removed from the packaging box 100 through the opening of the inner bag 41 and the opening 22. It is not essential that the inner bag 41 has a flap label 41A; for example, the inner bag 41 may have an opening line made of a half-cut line, and the opening 22 can be formed by tearing or cutting this opening line.

[0038] Figure 3 shows the packaging box 100 (packaging body 200) in an open state. When it is in this open state, and when the packaging box 100 (packaging body 200) is subsequently resealed and closed, the inner edge 24 of the box body 20 located near the opening 42 is exposed to water or alcohol volatilizing from the impregnated body 44. Also, when the impregnated body 44 is removed from the packaging box 100 through the opening 42 and the opening 22, the impregnated body 44 may come into contact with the inner edge 24 of the packaging box 100 surrounding the opening 22.

[0039] Thus, the inner edge 24 is prone to moisture, and repeated bonding and peeling of the lid material 30 places a large load (peeling stress) on it. With the packaging box 100 (packaging body 200) of this embodiment, the durability of the inner edge 24 is improved, so even if the lid material 30 is repeatedly bonded and peeled off, damage to the packaging box 100 (packaging body 200) can be sufficiently suppressed.

[0040] Since the packaging box 100 is made of a packaging sheet 10 that can maintain sufficient durability even when in contact with liquids such as moisture or alcohol, delamination and damage to the packaging sheet 10 can be sufficiently suppressed even at the inner edge 24. Therefore, the packaging box 100 and the packaged body 200 have sufficient durability.

[0041] Figure 4 shows a plan view of the packaging box 100 (packaging body 200) and a cross-sectional view of the lid material 30 attached to the packaging box 100 separately, in order to make the relative sizes and positions of each component easier to understand. The cross-sectional view of the lid material 30 is a view taken when the lid material 30 is cut along a plane parallel to the opening direction P and passing through the center of the opening 22. Lengths L1, L2, L3, L4, and L5 all represent the length L1 of the adhesive-free portion 32A, the length L2 of the opening 22 of the box body 20, the length L3 of the opening 42 of the inner bag 41, the length L4 between the outer edges of the reinforcing film 25, and the length L5 of the lid material 30, respectively, when viewed in a cross-section parallel to the opening direction P and passing through the center of the opening 22.

[0042] Since L1 > L2, the lid material 30 can be attached to the box body 20 such that the boundary 32C is located on the reinforcing film 25. This prevents the adhesive portion 32B of the lid material 30 from contacting the planned opening portion of the inner bag 41 and the flap label 41A before the packaging box 100 is opened. L1-L2 is preferably 1 mm or more, more preferably 2 mm or more, and even more preferably 3 mm or more. This sufficiently prevents the opening 22 of the box body 20 from being covered by the adhesive portion 32B of the lid material 30, even if the attachment position of the lid material 30 covering the opening 22 is slightly misaligned. L4-L1, which corresponds to the distance between the outer edge of the reinforcing film 25 and the adhesive-blocking portion 32A, is preferably 2 mm or more, and more preferably 3 mm or more. This ensures that the airtightness of the opening 22 by the lid material 30 is sufficiently high.

[0043] Since L2 > L3, it is possible to prevent the adhesive portion 32B of the lid material 30 from coming into contact with the impregnated body 44 contained in the inner bag 41 after the packaging box 100 is opened. This prevents components contained in the lid material 30 from mixing with the impregnated body 44. In addition, it is possible to prevent the impregnated body 44 from coming into contact with the inner edge 24 when the impregnated body 44 is removed from the opening 42. Therefore, it is possible to prevent the impregnated body 44 from getting caught on the inner edge 24 or from becoming wet due to contact with the impregnated body 44, making it less likely for the inner edge 24 to be damaged. L2-L3 may be 2-10 mm or 4-8 mm. This allows for sufficient prevention of damage to the inner edge 24 while maintaining the size of the opening 42.

[0044] The relationship L1 > L2 > L3 holds for lengths L1, L2, and L3. Furthermore, the relationship L5 ≥ L4 > L1 > L2 ≥ L3 may also hold for lengths L1, L2, L3, L4, and L5. In this case, the midpoints of lengths L1, L2, L3, L4, and L5 may lie on a straight line with the center C of the opening 22. Note that in Figure 4, each member is rectangular, but if they are not rectangular, the length can be determined as the maximum length measured parallel to the opening direction P.

[0045] The L4-L2 range, corresponding to the width of the reinforcing film 25, may be 5-30 mm or 8-20 mm. This allows for sufficient reinforcement of the inner edge 24 while ensuring sufficient adhesion between the lid material 30 and the box body 20.

[0046] Since L5 ≥ L4, the airtightness of the opening 22 of the box body 20 by the lid material 30 can be sufficiently high. The part outside the reinforcing film 25 does not come into contact with the impregnated material 44, nor does it absorb or adsorb volatile components released from the impregnated material 44, so it is not subjected to the same harsh conditions as the inner edge 24. For this reason, it can maintain high strength even without being covered by the reinforcing film 25. Furthermore, if L5 = L4, the opening 22 of the box body 20 can be sealed with the lid material 30 without the surface of the packaging sheet 10 and the adhesive part 32B coming into direct contact. This makes the durability of the packaging sheet 10 that constitutes the box body 20 sufficiently high.

[0047] The lengths L1, L2, L3, L4, and L5 only need to satisfy the above-mentioned inequality when measured along the opening direction P. However, it is preferable that the above-mentioned inequality (L5≧L4>L1>L2≧L3) is satisfied not only when measured along the opening direction P, but also along any direction intersecting the opening direction P in a plan view. It is also preferable that the difference between each length satisfies the same condition. This ensures that the above-mentioned effect can be obtained even when the lid material 30 is opened along a direction different from the opening direction P.

[0048] The box body 20 in the packaging box 100 may be obtained by assembling a packaging sheet 10 as shown in Figure 5. When the packaging sheet 10 is assembled into a box body 20, it may have, from the inside out, water-resistant paper 11, an adhesive layer 14, a base material layer 16, and a metal film 18 in that order.

[0049] The water-resistant paper 11 has, from the surface 10A side of the packaging sheet 10, a paper layer 11a containing a paper stock such as resin and pulp, and a pigment-containing layer 11b containing a pigment, in that order. Examples of pigments contained in the pigment-containing layer 11b include white pigments such as kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, and light calcium carbonate. However, the types of pigments are not limited to these, and other pigments include various pigments such as purple pigments and blue pigments. The pigment-containing layer may contain one pigment selected from the above by itself, or it may contain a combination of two or more pigments. The pigment-containing layer 11b may contain a binder, filler, and fluorescent dye, etc., that bind the particulate pigment together. The pigment-containing layer 11b may be a layer called a clay layer.

[0050] The weighing capacity of water-resistant paper 11 is, for example, 100-800 g / m². 2 It is fine to have 200-600g / m² 2 This is acceptable. This allows for both sufficient rigidity and good assembly. The thickness of the water-resistant paper 11 may be 100 to 800 μm, or 200 to 600 μm.

[0051] The paper layer 11a of the water-resistant paper 11 that forms one surface 10A of the packaging sheet 10 contains resin, which suppresses the absorption of moisture from the surface 10A. In a modified example, the paper layer 11a may have a resin coating layer, for example, made of acrylic resin, covering its surface. The resin contained in the paper layer 11a and the resin constituting the resin coating layer may be the same or different. Examples of resins included in the resin coating layer include (meth)acrylic resins.

[0052] The structure of water-resistant paper is not limited to those described above, and various forms with improved water resistance due to the inclusion of resin components can be used. Water-resistant paper may be manufactured by known methods, or commercially available products may be used. Examples of commercially available products include "N Mitsubishi Water-Resistant" manufactured by Mitsubishi Paper Mills Ltd., and "Eco Barry V" and "Eco Barry K" manufactured by Nippon Paper Industries Ltd.

[0053] In the packaging sheet 10, it is preferable that the pigment-containing layer 11b of the water-resistant paper 11 is in direct contact with the adhesive layer 14. By including the pigment-containing layer 11b in the water-resistant paper 11, the aesthetic appeal and design of the packaging sheet 10 can be improved.

[0054] Examples of adhesive compositions used in the adhesive layer 14 include acrylic adhesives, polyvinyl alcohol adhesives, urethane adhesives, polyester adhesives, polyether adhesives, epoxy adhesives, polyethyleneimine adhesives, and polybutadiene adhesives. From the viewpoint of ensuring sufficiently high adhesion with the water-resistant paper 11, the adhesive composition preferably includes an acrylic adhesive or an epoxy adhesive. The acrylic adhesive may also include an acrylic emulsion. The acrylic adhesive and epoxy resin may be one-component or two-component. An example of a two-component acrylic adhesive is an adhesive composition containing an acrylic resin (main component) and an epoxy curing agent. An example of a two-component epoxy resin is an adhesive composition containing an epoxy resin (main component) and a curing agent such as an amine.

[0055] The adhesive layer 14 formed from the cured product of such an adhesive composition exhibits excellent adhesion to the pigment-containing layer 11b and also has excellent water resistance. The pigment-containing layer 11b easily absorbs moisture, and its surface becomes smooth due to the presence of particulate pigment, which can impair adhesion to other layers. However, the adhesive layer 14 formed using an acrylic emulsion adheres well to the pigment-containing layer 11b. This prevents moisture from penetrating the interface between the pigment-containing layer 11b and the adhesive layer 14. Therefore, the excellent durability of the packaging sheet 10 can be fully maintained even when in contact with moisture.

[0056] The mass per unit area of ​​the adhesive layer 14 is 2-10 g / m². 2 Preferably, it is 4-10 g / m 2 This is more preferable. This makes it possible to sufficiently increase the peel adhesion strength between the adhesive layer 14 and the water-resistant paper 11.

[0057] The base layer 16 may be a resin film. Examples of resin films include polyester films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyolefin films such as polyethylene and polypropylene; polystyrene films; polyamide films such as 66-nylon; polycarbonate films; and engineering plastic films such as polyacrylonitrile films and polyimide films. The surface of the base layer 16 facing the adhesive layer 14 may be subjected to at least one treatment selected from chemical treatment, solvent treatment, corona treatment, plasma treatment, and ozone treatment. The thickness of the base layer 16 is not particularly limited and may be, for example, 3 to 50 μm or 6 to 30 μm.

[0058] The metal film 18 may contain aluminum, tin, indium, nickel, copper, silver, gold, platinum, brass, chromium, or zinc, or alloys of these metals. It may contain one of these metals alone, or two or more in combination. The metal film 18 can be manufactured, for example, by vacuum deposition, sputtering, or ion plating. The thickness of the metal film 18 is preferably 10 to 100 nm. This makes it possible to manufacture a packaging sheet 10 with excellent decorative properties due to its metallic luster at low cost.

[0059] A metal vapor-deposited film or a metal foil laminated film in which the base layer 16 and the metal film 18 are integrated may be used. An ink layer may be provided on the surface 10B of the packaging sheet 10 on the metal film 18 side. This makes it possible to obtain packaging sheets with various designs. Since the packaging sheet 10 has excellent aesthetics, it can be suitably used as an outer material for packaging containers and as a board material for packaging boxes. An anchor coating agent may be used to improve the adhesion of the ink layer on the surface 10B. Alternatively, a varnish layer may be provided by applying varnish to the surface of the ink layer to protect it. This makes it possible to suppress the peeling of the ink layer when the lid material 30 is peeled off from the box body 20.

[0060] An example of a method for manufacturing the packaging sheet 10 is described below. An adhesive is applied to the surface of the pigment-containing layer 11b of the water-resistant paper 11, and the water-resistant paper 11 and the metal vapor-deposited film or metal foil laminated film are bonded together via the adhesive. Bonding may be performed by dry lamination. In this way, the packaging sheet 10 can be manufactured.

[0061] From the viewpoint of ensuring smooth folding while increasing the rigidity of the packaging box, the thickness of the packaging sheet 10 is preferably 400 to 700 μm, and more preferably 500 to 600 μm. The packaging sheet 10 can be assembled into the box 20 smoothly if at least one of its surfaces 10A and 10B has a crease line that serves as the starting point for folding. The crease line may be a groove (recess), or through holes may be formed in a perforated manner.

[0062] The peel adhesion strength between the water-resistant paper 11 and the adhesive layer 14 in the packaging sheet 10 is preferably 1 [N / 15mm] or more, more preferably 3 [N / 15mm] or more, and even more preferably 4 [N / 15mm] or more. In the packaging sheet 10 equipped with water-resistant paper 11, since the surface of the pigment-containing layer 11b of the water-resistant paper 11 is smooth, the adhesion strength at the surface with this pigment-containing layer 11b is usually the lowest among multiple adhesive surfaces. Therefore, the packaging sheet 10 with the above-mentioned high peel adhesion strength can suppress peeling between the water-resistant paper 11 and the adhesive layer 14, and thus has sufficiently excellent durability. The above peel adhesion strength is a value measured by the measurement method (without water immersion) described in the examples. The peel adhesion strength can be increased by increasing the thickness of the adhesive layer 14.

[0063] Although one embodiment of the present invention has been described above, the present invention is not limited in any way to the above embodiment. For example, the packaging sheet is not limited to having the laminated structure described above, and may have any layer, or may not have some layers (films). For example, it may have water-resistant paper and an ink layer on top of it. In this case, a varnish layer may be provided by applying varnish to the surface of the ink layer to protect the ink layer. Furthermore, the shapes of the packaging box, packaging body and packaged goods are not limited to those shown. [Examples]

[0064] Examples of packaging sheets are shown below. This disclosure is not limited to the examples shown below.

[0065] [Production of packaging sheets] (Reference example 1) Commercially available water-resistant paper (Mitsubishi Paper Mills Ltd.'s "N Mitsubishi Water-Resistant," weighing 350g / m²) 2 A waterproof paper was prepared. This waterproof paper had a two-layer structure consisting of a paper layer containing a pulp and resin, and a pigment-containing layer containing a pigment (clay). As a two-component adhesive composition of acrylic resin and epoxy curing agent, EA-G34 and CAT-EP8 (both product names) manufactured by Toyo Morton Co., Ltd. were prepared. The pigment-containing layer of the waterproof paper and the aluminum vapor-deposited film base film (PET film) were bonded together via this adhesive composition using dry lamination. The application amount of the adhesive composition was 8.5 g / m² on a dry basis. 2 This was done. In this way, a packaging sheet was obtained comprising water-resistant paper, an adhesive layer, a PET film, and a metal film (aluminum vapor-deposited film) in this order.

[0066] (Reference example 2) The application rate of the adhesive composition is 3.7 g / m² on a dry basis. 2 Except for the above, a packaging sheet was obtained in the same manner as in Example 1.

[0067] [Measurement of peel adhesion strength] The packaging sheets obtained in each example and comparative example were cut to obtain rectangular (15 mm x 100 mm) test samples. The peel adhesion strength of each packaging sheet was measured in accordance with JIS K 6854-1:1999. Measurements were taken before immersion in water and after immersion in water for 1 hour. For immersion in water, water-resistant tape was applied to the entire front and back surfaces of the cut test samples and immersed in 23°C water for 1 hour. After removal from the water, the peel adhesion strength was measured.

[0068] The specific procedure for measuring the peel adhesion strength was as follows: After peeling the interlayer (interface between the water-resistant paper and the adhesive layer) at the edge, the peel adhesion strength between the layers was measured using a tensile testing machine under the conditions of angle: 90°, tensile speed: 300 mm / min, and temperature: 20°C. The results of this peel adhesion strength measurement are shown in Table 1.

[0069] [Table 1]

[0070] As shown in Table 1, the packaging sheets of Reference Examples 1 and 2 had sufficiently high peel adhesion strength. This high peel adhesion strength was maintained even after immersion in water. Therefore, they can be suitably used as materials for packaging boxes containing moisture-impregnated materials. [Industrial applicability]

[0071] According to this disclosure, it is possible to provide a packaging box that has excellent airtightness and excellent durability, even while using a packaging sheet containing paper material, and a packaging body equipped with such a packaging box. [Explanation of Symbols]

[0072] 10...Packaging sheet, 10A, 10B...Surface, 11...Waterproof paper, 11a...Paper layer, 11b...Pigment-containing layer, 14...Adhesive layer, 16...Base material layer, 18...Metal film, 20...Box body, 22...Opening, 24...Inner edge, 25...Reinforcement film, 30...Lid material, 31...Label layer, 32...Inner layer, 32A...Adhesive-blocking part, 32B...Adhesive part, 32C...Boundary, 40...Packaged item, 41...Inner bag, 41A...Flap label, 42...Opening, 44...Impregnated body, 52...Adhesive material, 100...Packaging box, 200...Packaging body.

Claims

1. A box having an opening formed to allow the packaged item to be removed, A packaging box comprising: an adhesive portion that adheres to the surface of the box body around the opening; and a lid material that seals the opening, having an adhesive-blocking portion provided closer to the center than the adhesive portion and covering the opening, The box is made of a packaging sheet containing paper material, and is provided with a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening. The lid material adheres to the reinforcing film and seals the opening such that the boundary between the adhesive portion and the adhesive-blocking portion of the lid material is located on the reinforcing film. A packaging box in which, when viewed in a cross-section parallel to the opening direction of the lid material and passing through the center of the opening, the length L1 of the adhesive-reducing portion and the length L2 of the opening satisfy the following formula (1). L1-L2≧1mm (1)

2. A box having an opening formed to allow the packaged item to be removed, A packaging box comprising: an adhesive portion that adheres to the surface of the box body around the opening; and a lid material that seals the opening, having an adhesive-blocking portion provided closer to the center than the adhesive portion and covering the opening, The box is made of a packaging sheet containing paper material, and is provided with a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening. The lid material is adhered to the reinforcing film and seals the opening such that the boundary between the adhesive portion and the adhesive-blocking portion of the lid material is located on the reinforcing film. The packaged item is housed in an inner bag inside the box. A packaging box in which, when viewed in a cross-section parallel to the opening direction of the lid material and passing through the center of the opening, the length L1 of the adhesive-retaining portion, the length L2 of the opening, and the length L3 of the planned opening portion of the inner bag satisfy the following formula (2). L1>L2≧L3 (2)

3. A box having an opening formed to allow the packaged items to be removed, A packaging box comprising: an adhesive portion that adheres to the surface of the box body around the opening; and a lid material that seals the opening, having an adhesive-blocking portion provided closer to the center than the adhesive portion and covering the opening, The box is made of a packaging sheet containing paper material, and is provided with a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening. The lid material is adhered to the reinforcing film and seals the opening such that the boundary between the adhesive portion and the adhesive-blocking portion of the lid material is located on the reinforcing film. The packaging sheet is a packaging box having, from the inside out, a water-resistant paper material, an adhesive layer, and a base material layer in that order.

4. The packaging box according to claim 3, wherein the packaging sheet has, from the inside out, the water-resistant paper, the adhesive layer, the base material layer, and the metal film in that order.

5. The packaging box according to claim 3 or 4, wherein the adhesive layer is composed of a cured product of an adhesive composition containing an acrylic adhesive or an epoxy adhesive.

6. The mass per unit area of ​​the adhesive layer is 2 to 10 g / m². ２ The packaging box according to any one of claims 3 to 5.

7. A box having an opening formed to allow the packaged item to be removed, A packaging box comprising: an adhesive portion that adheres to the surface of the box body around the opening; and a lid material that seals the opening, having an adhesive-blocking portion provided closer to the center than the adhesive portion and covering the opening, The box is made of a packaging sheet containing paper material, and is provided with a reinforcing film attached to the surface of the packaging sheet on the inner edge surrounding the opening. The lid material is adhered to the reinforcing film and seals the opening such that the boundary between the adhesive portion and the adhesive-blocking portion of the lid material is located on the reinforcing film. The lid material is a packaging box having a pair of resin layers and a metal layer between the pair of resin layers.

8. The packaging box according to any one of claims 1 to 7, wherein the adhesive strength between the surface of the packaging sheet and the reinforcing film is greater than the adhesive strength between the adhesive portion of the lid material and the reinforcing film.

9. The packaging box according to any one of claims 1 to 8, wherein the packaged object comprises an impregnated body impregnated with a liquid containing at least one selected from the group consisting of water, alcohol, and emulsion.

10. A packaging body comprising a packaging box according to any one of claims 1 to 9, and the packaged item contained in the packaging box.

Images