Transportation method

Abstract

A conveying method for using a moisture-proof box and conveying articles, that includes: a step in which a moisture-proof paper having a coating layer on at least one surface of a paper base material is transported in a wound state, corrugated by a corrugator, folded, and punched, then moisture-proof cardboard is carried in a sheet shape to a location where a moisture-proof box is to be used or the vicinity thereof, and is used to prepare a moisture-proof box that has an integrated structure having all bottom and side surface sections folded and formed into a box; a step in which the article is housed in the prepared moisture-proof box; and a step in which the moisture-proof box housing the article is shipped in order to convey same to the consumption area.

Description

[Technical field]

[0001] The present invention relates to a method for transporting articles using a moisture-proof box. [Background technology]

[0002] Conventionally, when chilled products such as seafood are transported with ice, polystyrene foam containers consisting of a polystyrene foam body and a lid are used (see, for example, Patent Document 1). Here, the polystyrene foam containers are manufactured in a container manufacturing factory and then transported by truck or the like to the place where the containers will be used, such as a fishing port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-62448 Summary of the Invention [Problem to be solved by the invention]

[0004] However, polystyrene foam containers are bulky, and the costs of transporting and storing them before use are high. In addition, with growing awareness of environmental protection, there is a demand for environmentally friendly methods of transporting goods.

[0005] An object of the present invention is to provide a method for transporting articles using moisture-proof boxes that are low-cost and environmentally friendly. [Means for solving the problem]

[0006] The transport method of the present invention is a method for transporting articles using a moisture-proof box, and includes the steps of: preparing a moisture-proof box having an integral structure with a bottom and side sections all folded in, which is made using moisture-proof cardboard that is transported in sheet form to a place where the moisture-proof box will be used or near the place where the moisture-proof box will be used, after which moisture-proof paper having a coating layer on at least one side of the paper base material is transported in a rolled form, corrugated with a corrugator, folded and punched, and then the moisture-proof box is transported in sheet form to the place where the moisture-proof box will be used or near the place where the moisture-proof box will be used; placing the article in the prepared moisture-proof box; and shipping the moisture-proof box containing the article for transport to the place of consumption.

[0007] The conveying method of the present invention is also directed to a method for conveying a coated sheet, the coating layer having an average coating layer thickness of 5.5 μm or more and a moisture permeability per unit thickness of 10 (g / m 2 -24h) / μm or less.

[0008] In the conveying method of the present invention, the coating layer contains a synthetic resin and a wax.

[0009] In the transport method of the present invention, the synthetic resin contains at least one of a styrene-based resin, an acrylic-based resin, a butadiene-based resin, a polyolefin-based resin, a polyvinyl alcohol resin, a polylactic acid resin, a polyester-based resin, and a polyethylene-based resin.

[0010] In the conveying method of the present invention, the wax is a hydrocarbon wax containing paraffin.

[0011] In the conveying method of the present invention, the moisture-proof box to be made is assembled from one sheet of the moisture-proof paper, a first side wall portion is provided which is connected to two opposing sides of a rectangular bottom portion via a first fold line, a second side wall portion is provided which is connected to the other two opposing sides of the bottom portion via a second fold line, and adjacent first and second side wall portions are connected to both side edges via third and fourth fold lines, respectively, to form a square having both side edges as two sides, and a diagonal line between the third fold line and the fourth fold line is fold inward as a fifth fold line. A folding portion is provided that is folded in half to form a triangle and folded toward the inner surface of the second side wall portion, and protrusions are provided on the two open edges of the folding portion, and a locking piece is provided that is connected to the open edge of the second side wall portion via a sixth fold line, and an engagement opening is formed between the locking piece and the second side wall portion into which the protrusion provided on the folding portion fits, and by valley folding the locking piece from the sixth fold line, the protrusion provided on the open edge of the folding portion folded toward the inner surface of the second side wall portion fits into the engagement opening.

[0012] In the conveying method of the present invention, the protrusions provided on the two open sides of the fold-in portion are formed by cutting a central portion of the two open sides of the fold-in portion to a depth exceeding a thickness of the moisture-proof raw paper to form a recess, and protrusions on both sides of the recess are the protrusions, the recess and the protrusions formed on the two open sides of the fold-in portion are formed to overlap when the fold-in portion is folded in half along the fifth fold line, and the locking piece provided on the open side of the second side wall portion is one of the two overlapping protrusions. The hole-shaped fitting opening into which the protruding piece fits is formed, and groove-shaped fitting openings into which the other protruding piece fits are formed on both sides of the hole-shaped fitting opening, and a connecting portion is formed between the hole-shaped fitting opening and the groove-shaped fitting opening, the connecting portion has a width that can be fitted into the recesses formed in the two open sides of the folding portion, and further, a notch is provided in the second side wall portion that forms part of the connecting portion within a range that does not exceed the depth of the recess, and the line connecting the tips of the notches is the sixth fold line.

[0013] In addition, in the conveying method of the present invention, the moisture-proof box further includes an inner lid covering an opening formed by the two first side wall portions and the two second side wall portions, and the inner lid is made of the moisture-proof paper.

[0014] In the transport method of the present invention, the moisture-proof box is provided with an outer lid that covers the opening, and the outer lid is made of the moisture-proof paper.

[0015] In the conveying method of the present invention, the fold lines include the first fold line, the second fold line, the third fold line, the fourth fold line, the fifth fold line, and the sixth fold line.

[0016] In addition, in the transportation method of the present invention, the moisture-proof box has a rectangular box body assembled from a single sheet of the moisture-proof paper, and a lid assembled from a single sheet of the moisture-proof paper that detachably fits around the outer periphery of the box body to cover the side and top opening of the box body, and the height of the box body and the inner depth of the lid are the same.

[0017] In the conveying method of the present invention, the moisture-proof box is assembled from a sheet of the moisture-proof paper, and a first side wall portion is provided that is connected to two opposing sides of a rectangular bottom via a first fold line, and a second side wall portion is provided that is connected to the other two opposing sides of the bottom via a second fold line, and a folding portion is provided between the adjacent first and second side wall portions, which is connected to both side edges via a third fold line and a fourth fold line, respectively, and is formed into a square with the both side edges as two sides, and is folded in half inwardly with the diagonal line between the third fold line and the fourth fold line as a fifth fold line, to form a triangle and folded onto the inner surface side of the second side wall portion, and a rectangular folding piece is provided to the open side of the second side wall portion via a seventh fold line and an eighth fold line, and the seventh fold line and the eighth fold line are valley folded to fold the folding piece onto the inner surface side of the second side wall portion.

[0018] In the conveying method of the present invention, the dimension from the eighth fold line to the open edge of the fold-in piece is the same as the dimension from the second fold line to the seventh fold line. Effect of the Invention

[0019] According to the present invention, it is possible to provide a method for transporting articles using a moisture-proof box which is low cost and environmentally friendly. [Brief description of the drawings]

[0020] [Figure 1] 5A to 5C are diagrams illustrating steps of a conveying method according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a perspective view showing a moisture-proof box according to a first embodiment of the present invention. [Diagram 3] FIG. 3 is an exploded view of the box shown in FIG. 2. [Figure 4] 3A to 3C are diagrams showing a process of assembling the box shown in FIG. 2. [Diagram 5] 3 is a plan view showing an inner lid to be attached to the opening of the box shown in FIG. 2. [Figure 6] 3 is a plan view showing a state in which an inner lid is attached to the opening of the box shown in FIG. 2. [Figure 7] FIG. 1 is a plan view showing an outer cover according to a first embodiment of the present invention. [Figure 8] 8 is a diagram showing a state in which the outer lid shown in FIG. 7 is placed on the moisture-proof box. [Figure 9] FIG. 11 is an exploded perspective view of a lidded moisture-proof box according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a development view of the lid shown in FIG. [Figure 11] 10 is an explanatory diagram showing a process for assembling the lid shown in FIG. 9. [Figure 12] FIG. 10 is an explanatory vertical cross-sectional view of the lidded box shown in FIG. [Figure 13] FIG. 11 is a perspective view of a moisture-proof box according to a third embodiment of the present invention. [Figure 14] FIG. 14 is an exploded view of the moisture-proof box shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The method for transporting goods according to the present invention will be described below with reference to the drawings. In this method, goods containing moisture, such as chilled products such as seafood, are transported with ice in order to prevent moisture from leaking to the outside, or dry goods are transported in moisture-proof boxes to protect them from external moisture.

[0022] In other words, the transportation method of the present invention includes the steps of preparing a moisture-proof box having an integral structure with the bottom and sides all folded in, which is made using moisture-proof cardboard that is transported in sheet form, in which moisture-proof paper having a coating layer on at least one side of the paper base material is transported in a rolled form, corrugated with a corrugator, folded and punched, and then transported in sheet form to a place where the moisture-proof box will be used or near thereto, a step of placing an item in the prepared moisture-proof box, and a step of shipping the moisture-proof box containing the item for transportation to the place of consumption.

[0023] 1 is a diagram showing each step of a transportation method according to an embodiment of the present invention, in which a moisture-proof box is prepared at a place where the moisture-proof box is used, such as a fishing port (S1).

[0024] First, at a papermaking factory and / or a paper coating factory, moisture-proof paper is manufactured with a coating layer on at least one side of a paper base material. More on moisture-proof paper later. The manufactured moisture-proof paper is transported in rolled form to a cardboard processing manufacturer. At the cardboard processing manufacturer, two sheets of moisture-proof paper (cardboard base paper) and one corrugated core base paper are bonded together using a corrugator. That is, cardboard processing is performed in which cardboard base paper is bonded to both sides of the core base paper using a corrugator with the coating layer facing outward, and moisture-proof cardboard is manufactured.

[0025] After that, the moisture-proof cardboard is printed, folded to form a box, and punched. The moisture-proof cardboard is then transported in sheet form to the location where the moisture-proof box will be used or nearby, where a moisture-proof box with an integrated structure in which the bottom and side sections are all folded in is made. That is, at the location where the moisture-proof box will be used, the box is made by a person who stores goods in the moisture-proof box. Alternatively, the box is made by a box maker near the location where the moisture-proof box will be used. The structure and manufacturing of the moisture-proof box will be described later. In this way, a moisture-proof box is prepared at the location where the moisture-proof box will be used.

[0026] In the prepared moisture-proof box, for example, seafood is placed together with ice (S2), and the moisture-proof box containing the goods is then shipped for transport to a consumer location such as a market or supermarket (S3).

[0027] This method of transporting goods can reduce the costs of transporting and storing empty boxes before use, and can also be easily disposed of after use, providing a low-cost, environmentally friendly method of transporting goods using moisture-proof boxes.

[0028] (Moisture-proof paper) The moisture-proof paper according to the present invention is described below. The moisture-proof paper according to the present invention comprises a paper base material and a coating layer located on at least one side of the paper base material. The coating layer has an average coating layer thickness of 5.5 μm or more and a moisture permeability per unit thickness of 10 (g / m 2 Such moisture-proof paper is characterized by having a surface roughness of 0.001 mm or less, and a surface roughness of 0.001 mm or less. This moisture-proof paper has both moisture-proof and waterproof properties, which prevents a decrease in strength when used in contact with moisture or water.

[0029] <Paper base material> The paper base material constituting the moisture-proof paper of the present invention can be one having an optimum basis weight depending on the application of the moisture-proof paper. When the paper base material is a single-ply paper, the lower limit of the basis weight is 10 g / m 2 Above, the upper limit is 250g / m 2It can be appropriately set within the following range. For example, when the paper base material is kraft paper, the lower limit of the basis weight is 30 g / m 2 Above, the upper limit is 250g / m 2 The lower limit of the basis weight can be set within the following range. In addition, when the paper base material is a multi-layer paperboard having two or more paper layers, the lower limit of the basis weight is 100 g / m 2 Above, the upper limit is 750g / m 2 It can be set appropriately within the following range. For example, in the case of a cardboard liner, the lower limit of the basis weight is 100 g / m 2 Above, the upper limit is 550g / m 2 It can be set within the following ranges:

[0030] The physical properties of the paper base material can be set appropriately depending on the application of the moisture-proof paper. For example, the lower limit of the longitudinal elongation is within a range of 1.0% or more and the upper limit is 15.0% or less, the lower limit of the transverse elongation is within a range of 2.0% or more and the upper limit is 12.0% or less, and the lower limit of the specific compression strength is 100 N m 2 / g or more, with an upper limit of 350N·m 2 The range can be set to be equal to or less than 1 / g.

[0031] Examples of raw material pulp for such paper base materials include various pulps derived from wood fibers, such as bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), unbleached softwood kraft pulp (NUKP), unbleached hardwood kraft pulp (LUKP), groundwood pulp (GP), refiner ground pulp (RGP), chemical pulp (CP), thermomechanical pulp (TMP), and chemi-thermomechanical pulp (CTMP), and non-wood pulps obtained from kenaf, bagasse, bamboo, hemp, straw, etc.

[0032] The paper base material may contain recycled paper pulp or may not contain recycled paper pulp. When recycled paper pulp is contained, for example, when the paper base material is a single-layer paper, the recycled paper pulp content of the total pulp can be preferably 10% by mass or more, more preferably 25% by mass or more, even more preferably 50% by mass or more, and most preferably 70% by mass or more, and can be 100% by mass (consisting only of recycled paper-derived pulp). In addition, kraft pulp may be blended as a pulp other than recycled paper pulp, and the total amount may be kraft pulp. In addition, when the paper base material is a multi-layer paperboard having two or more paper layers, the recycled paper pulp content per layer can be as described above, and the recycled paper pulp content in each layer may be different.

[0033] Examples of waste paper pulp that can be used include waste paper pulp obtained by disintegrating unprinted waste paper such as cardboard, white, extra white, medium white, and white damage; waste paper printed on fine paper, fine coated paper, medium quality paper, medium quality coated paper, and recycled paper; and written waste paper, papers such as discarded confidential documents, waste magazines, and waste newspapers that have been disintegrated and then deinked (DIP).

[0034] <Coating layer> As described above, the coating layer constituting the present invention has a lower limit of the average coating layer thickness of 5.5 μm or more, preferably 5.7 μm or more. The upper limit of the average coating layer thickness can be 20 μm or less, preferably 15 μm or less, and more preferably 12.5 μm or less. The upper limit of the moisture permeability per unit thickness of the coating layer is 10 (g / m 2 24h) / μm or less, preferably 8 (g / m 2 ·24h) / μm or less. Here, the average coating layer thickness is the average value of the thicknesses of the coating layer measured at 10 arbitrary points. The moisture permeability per unit thickness of the coating layer is a value calculated by dividing the moisture permeability measured from the coating layer side of the moisture-proof paper in accordance with JIS Z 0208 by the average coating layer thickness.

[0035] If the average coating layer thickness is less than 5.5 μm, it becomes difficult for the moisture-proof paper of the present invention to have moisture-proof and waterproof properties. 2 If the surface roughness exceeds 1 / 24h / μm, not only will the waterproofing of the moisture-proof paper of the present invention decrease, but the moisture-proofing itself will also become insufficient. Here, waterproofing in the present invention means that when a container is made using the moisture-proof paper and water is poured into the container and left for one week, water does not seep out and the shape of the container does not change, or there is some deformation but the shape of the container is maintained.

[0036] Such a coating layer preferably contains a synthetic resin and a wax. The synthetic resin preferably contains at least one of a styrene-based resin, an acrylic-based resin, a butadiene-based resin, a polyolefin-based resin, a polyvinyl alcohol resin, a polylactic acid resin, a polyester-based resin, and a polyethylene-based resin. In particular, the synthetic resin is preferably a styrene-based resin and / or an acrylic-based resin.

[0037] (styrene resin) The styrene-based resin that can be contained in the coating layer constituting the present invention is a resin in which the copolymerization ratio of a styrene-based monomer having a styrene skeleton in its structure is 50 mass% or more, and may be composed only of a polymer of a styrene-based monomer.

[0038] Examples of the styrene monomer include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, α-methylstyrene, and α-methyl-p-methylstyrene.

[0039] Examples of monomers copolymerizable with the styrene monomer include alkyl methacrylates such as methyl methacrylate, cyclohexyl methacrylate, and methylphenyl methacrylate, alkyl acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, and cyclohexyl acrylate, unsaturated carboxylic acids such as methacrylic acid and acrylic acid, unsaturated dicarboxylic anhydrides such as maleic acid and itaconic acid, unsaturated nitriles such as acrylonitrile and methacrylonitrile, and conjugated dienes such as 1,3-butadiene and 2-methyl-1,3-butadiene. These can be used alone or in combination of two or more.

[0040] (Acrylic resin) The acrylic resin that can be contained in the coating layer constituting the present invention is a resin in which the copolymerization ratio of acrylic monomers, such as acrylic acid, methacrylic acid, and derivatives thereof, is 50 mass% or more, and may be composed only of polymers of acrylic monomers.

[0041] Examples of the acrylic monomer include methacrylic acid esters such as cyclohexyl methacrylate, t-butylcyclohexyl methacrylate, and methyl methacrylate, and acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and isopropyl acrylate. The acrylic resin may be a polymer of one or more monomers selected from these acrylic monomers.

[0042] Examples of monomers copolymerizable with acrylic monomers include aromatic vinyl compounds such as styrene, o-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, α-methylstyrene, and α-methyl-p-methylstyrene, unsaturated nitriles such as acrylonitrile and methacrylonitrile, maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide, unsaturated dicarboxylic anhydrides such as maleic anhydride, and unsaturated carboxylic acids such as methacrylic acid and acrylic acid. These can be used alone or in combination of two or more.

[0043] (wax) Examples of waxes contained in the coating layer include synthetic waxes such as polyethylene wax, Fischer-Tropsch wax, oil-based synthetic waxes (fatty acid esters, fatty acid amides, ketones and amines), hydrogenated oil, and natural waxes such as beeswax, wood wax, paraffin wax, microcrystalline wax, etc. These waxes can be used alone or in combination of two or more, and in particular, hydrocarbon waxes containing paraffin are preferred.

[0044] The moisture-proof paper of the present invention has a moisture permeability of 50 (g / m 2 24h) / μm or less, preferably 20(g / m 2 24h) / μm or less, more preferably 10(g / m 2 ·24h) / μm or less, and when a container is made using the moisture-proof paper and filled with water and left for a week, water does not seep out and the shape of the container does not change, or the container shape is maintained although there is some deformation. Therefore, it has excellent moisture-proofing and waterproofing properties, which has the effect of suppressing the decrease in strength in applications where it comes into contact with moisture or water. The moisture permeability of the moisture-proof paper is measured from the coating layer side in accordance with JIS Z0208.

[0045] <Production Example> An example of the manufacture of moisture-proof paper of the present invention will be described. First, a desired paper base material is prepared according to the application of the moisture-proof paper. Here, an example of paper base material production will be described. In the paper base material production, for example, various pulps derived from wood fibers such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood unbleached kraft pulp (NUKP), hardwood unbleached kraft pulp (LUKP), groundwood pulp (GP), refiner ground pulp (RGP), chemical pulp (CP), thermomechanical pulp (TMP), and chemi-thermomechanical pulp (CTMP), and non-wood pulps obtained from kenaf, bagasse, bamboo, hemp, straw, etc. can be used as raw material pulp.

[0046] In the papermaking of the paper base material, recycled paper pulp can be used, and the recycled paper pulp content in the paper base material can be appropriately set according to the application of the moisture-proof paper. The recycled paper pulp can be obtained by disintegrating unprinted recycled paper such as recycled cardboard, white, extra white, medium white, and white damaged paper, recycled paper printed on fine paper, fine coated paper, medium quality paper, medium quality coated paper, and recycled paper, and pulp (DIP) obtained by disintegrating and deinking recycled paper such as discarded confidential documents, recycled magazines, and recycled newspapers.

[0047] In addition, in the papermaking process of the paper base material, sizing agents and water repellents for preventing moisture absorption can be added internally or externally, and further, paper strength agents can be added internally to improve strength. Examples of sizing agents include rosin-based sizing agents, rosin emulsion-based sizing agents, α-carboxymethyl saturated fatty acids, neutral rosin-based sizing agents, alkyl ketene dimers (AKD), alkenyl succinic anhydrides (ASA), cationic polymer-based sizing agents, etc. Examples of water repellents include fluorine-based resins, polyamide-based resins, wax emulsions, etc. Examples of paper strength agents include conventionally used paper strength agents such as polyacrylamide (PAM) and modified starch.

[0048] If necessary, known fillers can be added to the paper base material, such as inorganic fillers including kaolin, calcined kaolin, delaminated kaolin, clay, calcined clay, delaminated clay, illite, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica composite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, and organic fillers including urea-formaldehyde resin, polystyrene resin, and phenol resin.

[0049] Furthermore, aluminum sulfate, aluminum chloride, sodium aluminate, basic aluminum compounds, water-soluble aluminum compounds, polyvalent metal compounds, silica sol, etc. may be added internally within the limits that do not affect the quality of the paper base material.

[0050] Next, a coating layer is formed on one or both desired sides of the paper substrate. The coating layer can be formed by applying a coating agent using a known coating method, such as air knife coating, curtain coating, blade coating, gate roll coating, etc. The coating layer can be formed by single layer coating, or two or more layers can be simultaneously coated by curtain coating as necessary.

[0051] The coating agent for the coating layer may be, for example, a mixture of a synthetic resin and a wax dispersed in a solvent, which may contain pigments, binders, stabilizers, defoamers, waterproofing agents, viscosity improvers, water retention agents, preservatives, colorants, etc.

[0052] In the manufacture of the moisture-proof paper of the present invention, the lower limit of the average coating layer thickness is 5.5 μm or more, preferably 5.7 μm or more, and the upper limit of the moisture permeability per unit thickness of the coating layer measured in accordance with JIS Z 0208 is 10 (g / m 2 24h) / μm or less, preferably 8 (g / m 2The coating layer is formed so that the upper limit of the average coating layer thickness is 20 μm or less, preferably 15 μm or less, and more preferably 12.5 μm or less. To form such a coating layer, for example, the amount of coating agent applied to the paper substrate is 20 g / m 2 Coating can be carried out so as to satisfy the following range, and preferably the lower limit of the coating amount of the coating agent is 4 g / m 2 Above 20g / m 2 Less than 15g / m 2 It is preferable to carry out coating so that the thickness falls within the following range.

[0053] The moisture-proof paper of the present invention having a coating layer formed on the paper base material has a moisture permeability of 50 (g / m2) per unit thickness as measured in accordance with JIS Z 0208. 2 24h) / μm or less, preferably 20(g / m 2 24h) / μm or less, more preferably 10(g / m 2 ·24h) / μm or less, and when a container is made using the moisture-proof paper and filled with water and left for a week, water does not seep out and the container does not deform, or, although there is some deformation, the container shape is maintained.

[0054] There is no particular limitation on the uses of the moisture-proof paper according to the present invention, and it can be used, for example, as cardboard boxes, individual packaging boxes for carrying hygroscopic items such as detergents, and the like. EXAMPLES

[0055] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

[0056] [Production Example 1] (Preparation of paper substrate) It is made of 63% softwood unbleached kraft pulp (NUKP) and 37% recycled paper pulp by mass, and is coated on the surface with water-resistant agents, viscosity improvers, water-retention agents, preservatives, and colorants, resulting in a three-layered paper with a basis weight of 280g / m. 2A paperboard for the liner was produced so as to obtain a paper base material (Reference Sample 1).

[0057] (Formation of coating layer) A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of a moisture-proof agent (VAPORCOAT2200.S manufactured by Michelman Co.) in which a styrene-based resin, an acrylic-based resin, and a hydrocarbon-based wax containing paraffin were mixed and dispersed in a solvent. This coating agent was used to manually coat one side of the above paper substrate (Reference Sample 1) using a Mayer bar so as to obtain four coating amounts as shown in Table 1 below, and the coating layer was formed by drying (105°C, 60 seconds). In this way, four types of moisture-proof paper (Samples 1-1 to 1-4) were produced.

[0058] [Production Example 2] (Preparation of paper substrate) The paper is made of 21% softwood unbleached kraft pulp (NUKP) and 79% recycled paper pulp by mass, and is coated with a surface sizing agent, resulting in a three-layered paper with a basis weight of 260g / m 2 A paperboard for the liner was produced so as to obtain a paper base material (Reference Sample 2).

[0059] (Formation of coating layer) A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of the same moisture-proof agent as in Production Example 1. This coating agent was hand-coated on one side of the above paper substrate (Reference Sample 2) so as to obtain six different coating amounts as shown in Table 1 below, and then dried (105°C, 60 seconds) to form a coating layer. In this way, six types of moisture-proof paper (Samples 2-1 to 2-6) were produced.

[0060] [Production Example 3] A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of a moisture-proof agent (Zaikuzen A, manufactured by Sumitomo Seika Chemicals Co., Ltd.) in which a polyolefin resin was mixed and dispersed in a solvent. This coating agent was applied by hand to one side of a paper substrate (Reference Sample 1) similar to that in Production Example 1 so as to obtain three coating amounts as shown in Table 1 below, and the coating layer was formed by drying (105°C, 60 seconds). In this way, three types of moisture-proof paper (Samples 3-1 to 3-3) were produced.

[0061] [Production Example 4] Production Example 3 A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of the same moisture-proof agent as in Example 1. This coating agent was hand-coated on one side of a paper substrate (Reference Sample 2) similar to that in Example 2 so as to obtain three coating amounts as shown in Table 1 below, and then dried (105°C, 60 seconds) to form a coating layer. In this way, three types of moisture-proof paper (Samples 4-1 to 4-3) were produced.

[0062] [Production Example 5] (Preparation of paper substrate) Made from softwood unbleached kraft pulp (NUKP), with a basis weight of 75g / m 2 Kraft paper was produced so as to obtain a paper base material (Reference Sample 3).

[0063] (Formation of coating layer) A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of the same moisture-proof agent as in Production Example 1. This coating agent was used to form a coating layer by coating one side of the above paper base material (Reference Sample 3) by air knife coating so as to achieve four different coating amounts as shown in Table 1 below. In this way, four types of moisture-proof paper (Samples 5-1 to 5-4) were produced.

[0064] [Production Example 6] A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of a moisture-proof agent (Saibinol EK-834, manufactured by Saiden Chemical Co., Ltd.) in which styrene-based resin and / or acrylic-based resin and rosin were mixed and dispersed in a solvent. This coating agent was hand-coated on one side of a paper substrate (Reference Sample 1) similar to that in Production Example 1 so as to achieve the coating amount shown in Table 1 below, and then dried (105°C, 60 seconds) to form a coating layer. This produced moisture-proof paper (Sample 6).

[0065] [Production Example 7] A coating agent was prepared by adding 0.46 parts by weight of an antifoaming agent to 100 parts by weight of the same moisture-proof agent as in Production Example 6. This coating agent was hand-coated on one side of the same paper substrate (Reference Sample 2) as in Production Example 2 so as to achieve the coating amount shown in Table 1 below, and dried (105°C, 60 seconds) to form a coating layer. This produced moisture-proof paper (Sample 7).

[0066] [Physical property measurements] The moisture permeability of each of the prepared paper substrates (Reference Samples 1 to 3) and each of the moisture-proof papers was measured as follows, and the results are shown in Table 1 below.

[0067] <Moisture permeability> The measurement is made in accordance with JIS Z 0208. For each moisture-proof paper, the measurement is made from the coating layer side.

[0068] For each moisture-proof paper prepared, the average coating layer thickness and the moisture permeability per unit thickness of the coating layer were measured and calculated as follows, and the results are shown in Table 1. The waterproof property was also evaluated as follows, and the results are shown in Table 1.

[0069] <Average coating layer thickness> The average thickness of the coating layer measured at any 10 points is calculated.

[0070] <Moisture permeability per unit thickness of coating layer> The moisture permeability is calculated by dividing the moisture permeability measured from the coating layer side in accordance with JIS Z 0208 by the average coating layer thickness.

[0071] <Waterproof> A container measuring 28 cm in length, 22 cm in width, and 13 cm in depth was made using moisture-proof paper (with the coating layer on the inside side). 1.0 L of water was poured into the container and it was left for one week in an environment with a temperature of 40°C and humidity of 80%, after which the amount of water seeping out was observed and judged according to the following criteria. (Waterproofing criteria) ○: Water does not seep onto the outside of the container or onto the inside of the container above the water level. ×: Water seeps out onto the outside of the container or onto the inside of the container above the water level.

[0072] [Table 1]

[0073] As shown in Table 1, the average coating layer thickness is 5.5 μm or more, and the moisture permeability per unit thickness of the coating layer is 10 (g / m 2 ·24h) / μm or less (Samples 1-1 to 1-3, 2-1 to 2-5, 3-1, 3-2, 4-1, 4-2, 5-1, and 5-2) were confirmed to have excellent moisture-proof properties as well as waterproof properties.

[0074] In contrast, the average coating layer thickness of the coating layer is less than 5.5 μm, or the moisture permeability per unit thickness of the coating layer is less than 10 (g / m 2 It was confirmed that moisture-proof papers with a hardness exceeding 1.8·24h / μm (Sample 1-4, Sample 2-6, Sample 3-3, Sample 4-3, Sample 5-3, Sample 5-4, Sample 6, and Sample 7) tend to have poor waterproof properties and high moisture permeability, resulting in poor moisture proof properties.

[0075] (Moisture-proof box) Hereinafter, the moisture-proof box according to the present invention will be described with reference to the drawings. Figures 2 to 6 show a moisture-proof box according to a first embodiment of the present invention, in which Figure 2 is a perspective view of the moisture-proof box, Figure 3 is a development view of the moisture-proof box shown in Figure 2, Figure 4 is an explanatory view showing the process of assembling the moisture-proof box shown in Figure 2, Figure 5 is a plan view showing an inner lid to be attached to the opening of the moisture-proof box shown in Figure 2, and Figure 6 is a plan view showing the state in which the inner lid is attached to the opening of the moisture-proof box shown in Figure 2.

[0076] The moisture-proof box 1 shown in Fig. 2 is made from a sheet of moisture-proof corrugated board, i.e., the moisture-proof paper of the present invention. The moisture-proof corrugated board is made by a person who stores goods at a place where the moisture-proof corrugated board box is used, or by a box manufacturer near the place where the moisture-proof corrugated board box is used. As shown in the development view of Fig. 3, the box 1 has first side wall portions 4 provided on two opposing sides of a rectangular bottom portion 2 via first fold lines 3, and second side wall portions 6 provided on the other two opposing sides of the bottom portion 2 via second fold lines 5.

[0077] Between the adjacent first side wall portion 4 and second side wall portion 6, a folded portion 10 is provided, which is connected to both side edges via a third fold line 7 and a fourth fold line 8, respectively, and is formed into a square with both side edges as two sides. The folded portion 10 is folded inward in half with the diagonal line between the third fold line 7 and the fourth fold line 8 as a fifth fold line 9, to form a triangle, which is folded toward the inner surface side of the second side wall portion 6.

[0078] The two open sides of the folded portion 10 are provided with protruding pieces 11a and 11b. The central parts of the two open sides of the folded portion 10 are cut out to a depth exceeding the sheet thickness to form recesses 12, and protruding pieces 13a and 13b on both sides of the recesses 12 are protruding pieces 11a and 11b, so that the recesses 12 formed on the two open sides of the folded portion 10 and the protruding pieces 13a and 13b overlap when the folded portion 10 is folded in half along the fifth fold line 9.

[0079] The cut depth of the recess 12 formed by cutting out the central parts of the two open sides of the folded-in portion 10 is preferably two to three times the sheet thickness. If the cut depth of the recess 12 is two to three times the sheet thickness, when the protruding pieces 11a and 11b are fitted into the fitting openings of the locking pieces described below, the tips of the protruding pieces 11a and 11b protrude from the fitting openings of the locking pieces by a width at least equal to or greater than the sheet thickness, so that a reliable locking state is obtained between the protruding pieces 11a and 11b and the locking pieces. In addition, the inner lid described below can be securely placed over the opening of the assembled box 1. In the box 1, the cut depth of the recess 12 is three times the sheet thickness.

[0080] In addition, a locking piece portion 15 is provided on the open edge of the second side wall portion 6, which is connected via a sixth fold line 14, and fitting openings 16a, 16b are formed between the locking piece portion 15 and the second side wall portion 6, into which the protrusions 11a, 11b provided on the folded portion 10 fit. By folding the locking piece portion 15 in a valley from the sixth fold line 14, the protrusions 11a, 11b provided on the folded portion 10 folded toward the inner surface of the second side wall portion 6 fit into the fitting openings 16a, 16b.

[0081] In the locking piece portion 15 provided on the open edge of the second side wall portion 6, a hole-like fitting opening 16a is formed in the center along the open edge of the second side wall portion 6, into which one protrusion portion 11a consisting of two overlapping protrusions 13a, 13a fits, and groove-like fitting openings 16b are formed on both sides of the locking piece portion 15 along the open edge of the second side wall portion 6, into which the other protrusion portion 11b consisting of two overlapping protrusions 13b, 13b fits.

[0082] The area between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting portion 17 that is connected to the second side wall portion 6, and the connecting portion 17 has a width that allows it to fit into the recesses 12 formed in the two open sides of the folding portion 10.Furthermore, the second side wall portion 6 is provided with a notch 18 that forms part of the connecting portion 17 but does not exceed the depth of the recess 12, and the line connecting the tips of the notch 18 forms the sixth fold line 14.

[0083] The box 1 having such an unfolded structure is assembled as follows. First, the first side wall portions 4 provided on two opposing sides of the bottom portion 2 are valley-folded and raised from the first fold line 3, and the second side wall portions 6 provided on the other two opposing sides of the bottom portion 2 are valley-folded and raised from the second fold line 5. In synchronization with the raising of the first side wall portion 4 and the second side wall portion 6, the square fold-in portion 10 provided between the adjacent first side wall portion 4 and second side wall portion 6 is mountain-folded along the diagonal fifth fold line 9 and valley-folded along the third fold line 7 and the fourth fold line 8 to fold inward in two to form a triangle, which is then folded toward the inner surface of the second side wall portion 6. When the folded-in portion 10 is folded inward in half to form a triangle, the recesses 12 formed on the two open sides of the folded-in portion 10 and the protrusions 13a, 13b overlap with each other, and the overlapping protrusions 13a, 13b become protruding pieces 11a, 11b provided on the open sides of the folded-in portion 10 (see Figure 4).

[0084] Next, the locking piece portion 15 provided on the open edge of the second side wall portion 6 is folded inwardly from the sixth fold line 14, and the protrusion portions 11a, 11b provided on the folded portion 10 are fitted into the fitting openings 16a, 16b formed between the locking piece portion 15 and the second side wall portion 6.

[0085] In the locking piece portion 15, a hole-shaped fitting opening 16a into which one protruding piece portion 11a consisting of two overlapping protrusions 13a, 13a fits is formed in the center between the locking piece portion 15 and the second side wall portion 6 along the open edge of the second side wall portion 6 in the center of the locking piece portion 15, and a groove-shaped fitting opening 16b into which the other protruding piece portion 11b consisting of two overlapping protrusions 13b, 13b fits is formed on both sides of the locking piece portion 15 along the open edge of the second side wall portion 6, and a connecting portion 17 connecting to the second side wall portion 6 is formed between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b. The connecting portion 17 has a width that allows it to fit into the recesses 12 formed on the two open sides of the folded-in portion 10, and furthermore, the second side wall portion 6 is provided with a notch 18 that forms part of the connecting portion 17 within a range that does not exceed the depth of the recess 12, and the line connecting the tips of the notch 18 forms the sixth fold line 14, and by folding the locking piece portion 15 inwardly from the sixth fold line 14 and fitting the connecting portion 17 into the recess 12, the protruding pieces 11a and 11b provided on the folded-in portion 10 are fitted into the fitting openings 16a and 16b formed between the locking piece portion 15 and the second side wall portion 6. In this manner, the assembly of the box 1 is completed (see FIG. 4).

[0086] In this way, box 1 can be easily assembled by the simple process of folding inwardly in half the folded portion 10 provided between adjacent first side wall portion 4 and second side wall portion 6, raising the first side wall portion 4 and second side wall portion 6 from bottom portion 2, folding the folded in half toward the inner surface of second side wall portion 6 and overlapping it on the inner surface of second side wall portion 6, and from this state, folding locking piece portion 15 provided on the open edge of second side wall portion 6 from sixth fold line 14 in a valley fold, and fitting protrusions 11a, 11b provided on the open edge of folded portion 10 folded toward the inner surface of second side wall portion 6 into fitting openings 16a, 16b formed between locking piece portion 15 and second side wall portion 6.

[0087] In addition, the protrusions 11a, 11b provided on the two open sides of the folding portion 10 are formed by cutting out the central parts of the two open sides of the folding portion 10 to a depth that exceeds the sheet thickness to form recesses 12, and the protrusions 13a, 13b on both sides of recesses 12 are protrusions 11a, 11b, and are formed so that the recesses 12 formed on the two open sides of the folding portion 10 and the protrusions 13a, 13b overlap when the folding portion 10 is folded in half along the fifth fold line 9.

[0088] In the locking piece portion 15, a hole-shaped fitting opening 16a is formed in the center along the open edge of the second side wall portion 6, into which one of the protruding pieces 11a consisting of two overlapping protrusions 13a, 13a fits, and a groove-shaped fitting opening 16b is formed on both sides of the locking piece portion 15 along the open edge of the second side wall portion 6, into which the other of the protruding pieces 11b consisting of two overlapping protrusions 13b, 13b fits. The portion between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting portion 17 that is connected to the second side wall portion 6, and the connecting portion 17 has a width that can be fitted into the recesses 12 formed on the two open edges of the folding portion 10. Furthermore, the second side wall portion 6 is provided with a cut 18 that forms a part of the connecting portion 17 within a range not exceeding the depth of the recesses 12. , and the line connecting the tips of the notches 18 forms the sixth fold line 14. Therefore, by folding the locking piece portion 15 provided on the open edge of the second side wall portion 6 inwardly from the sixth fold line 14 and fitting the connecting portion 17 into the recess 12, the protrusions 11a, 11b provided on the folded portion 10 fit into the fitting openings 16a, 16b formed between the locking piece portion 15 and the second side wall portion 6. The protrusions 11a, 11b fitted into the fitting openings 16a, 16b have their tips protruding from the fitting openings 16a, 16b of the locking piece portion 15. As a result, a reliable locking state is obtained between the protrusions 11a, 11b and the locking piece portion 15. The second side wall portion 6 and the folded portion 10 folded toward the inner surface side of the second side wall portion 6 can be reliably fixed, and a robust box 1 can be obtained.

[0089] In particular, since the cut-out depth of recess 12 is three times the sheet thickness, the tips of protrusions 11a, 11b engaged with fitting openings 16a, 16b protrude from the fitting opening of locking piece 15 by a width at least equal to the sheet thickness, thereby obtaining a more secure locking state between protrusions 11a, 11b and locking piece 15 and a more robust box 1.

[0090] Furthermore, since there are no obstructing protruding parts on the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the assembled box 1, a box that is easy to handle can be obtained.

[0091] Box 1 also includes an inner lid 20 that can be detachably attached. Inner lid 20 is made of a rectangular plate-like body that fits inside the opening of box 1, and a fitting piece 21 is formed on the edge of inner lid 20 on the second side wall side, which fits into hole-like fitting opening 16a and groove-like fitting opening 16b formed in locking piece 15 and fits between protruding piece 11a and protruding piece 11b provided on the open edge of fold-in part 10 protruding from locking piece 15 (see FIG. 5). The plate-like body is made of the same moisture-proof sheet-like cardboard as box 1.

[0092] When the inner lid 20 is attached to the opening of the box 1 to close it, the inner lid 20 is fitted into the opening of the box 1 (see FIG. 6). The inner surface of the inner lid 20 fitted into the opening of the box 1 abuts against the locking piece 15 that is bent inwardly of the box 1, and the fitting piece 21 formed on the edge of the second side wall portion of the inner lid 20 fits into the recess 12 formed on the open edge of the folded-in portion 10 and abuts against the connecting portion 17 of the locking piece 15 that fits into the recess 12. In this way, the inner lid 20 is attached to the opening of the box 1, and the opening of the box 1 is closed.

[0093] When closing the opening of box 1, the inner lid 20 can be attached to the opening of box 1 by a simple operation of fitting the inner lid 20 into the opening of box 1, thereby closing the opening of box 1. When removing the inner lid 20 closing the opening of box 1, the inner lid 20 can be removed from the opening of box 1 by a simple operation of fitting the inner lid 20 into the recess 12, hooking a finger on the end of the fitting piece 21 of the inner lid 20 that is exposed on the outer surface of the second side wall portion 6, and pulling it up, thereby opening the box 1.

[0094] FIG. 7 is a plan view of the outer lid that is placed on the box 1, and FIG. 8 is an explanatory diagram showing the state in which the outer lid is placed on the box 1.

[0095] The outer lid 40 is formed from a single piece of moisture-proof cardboard, similar to the box 1. As shown in the plan view of Fig. 7, the outer lid 40 has a rectangular top part 41 formed to the same size as the outer shape of the opening of the box 1, and side walls 43 are provided on each of the four sides via folding lines 42.

[0096] The outer lid 40 is formed by folding the side wall portions 43 provided on each of the four sides of the top portion 41 in a mountain fold from the fold lines 42, and in this state, covering the box 1 with the side wall portions 43 overlapping the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the box 1; alternatively, the top portion 41 is placed against the opening of the box 1, and then the side wall portions 43 are folded in a mountain fold from the fold lines 42, and the side wall portions 43 are covered with the box 1 in a manner that overlaps the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the box 1 (see Figure 8).

[0097] Adhesive tape is wrapped around the side wall 43 of the outer lid 40 placed on the box 1 to prevent the side wall 43 overlapping the outer surfaces of the first side wall 4 and the second side wall 6 of the box 1 from spreading. In this way, the outer lid 40 can be easily placed on the box 1.

[0098] In the first embodiment described above, the inner lid 20 and the outer lid 40 that cover the box 1 are provided as separate bodies from the box 1. However, the inner lid and the outer lid may be folded to form a one-piece box.

[0099] Fig. 9 is an exploded perspective view of a box with lid according to the second embodiment of the present invention, Fig. 10 is a development view of the lid shown in Fig. 9, Fig. 11 is an explanatory view showing the process of assembling the lid shown in Fig. 9, and Fig. 12 is an explanatory vertical cross-sectional view of the box with lid. The box with lid 100 is made of a sheet of moisture-proof corrugated board, i.e., the moisture-proof paper of the present invention, and is formed as separate bodies, a box body 102 and a lid body 103. Here, the box body 102 has the same structure as the moisture-proof box 1 according to the first embodiment of the present invention (see Figs. 2 to 4), and is formed so that the height of the first side wall 4 and the second side wall 6 is H.

[0100] The lid body 103 is configured to be removably fitted around the outer periphery of the box body 102 to cover the first side wall portion 4, the second side wall portion 6 and the upper opening of the box body 102, and the dimension of the inner depth D of the lid body 103 is the same as the height H of the box body 102.

[0101] As shown in the developed view of Figure 10, the lid body 103 has side portions 24 provided on two opposing sides of a rectangular top plate portion 22 via fold lines 23, and side portions 26 provided on the other two opposing sides of the top plate portion 22 via fold lines 25.

[0102] A folded piece 28 is connected to each of both side edges in the width direction of the side portion 24 via a fold line 27. A protruding piece 30 is connected to a part of the side edge of the folded piece 28 on the side portion 26 side via a fold line 29. In this example, a part 31a of a cutting line portion 31 that separates the folded piece 28 from the side portion 26 is expanded so as to enter the side portion 26, and the part of the expanded portion facing the folded piece 28 serves as the protruding piece 30.

[0103] In addition, between the top plate portion 22 and the side plate portion 26, i.e., on the fold line 25, a notch 32 is provided at a position corresponding to the protrusion 30 connected to the side edge of the folded-over piece 28, i.e., at a position where the protrusion 30 connected to the side edge of the folded-over piece 28 can be inserted when, as described below, the side plate portions 26 on two opposing sides of the top plate portion 22 are raised by a valley fold from the fold line 25, the side plate portions 24 on the other two opposing sides of the top plate portion 22 are raised by a valley fold from the fold line 23, and the folded-over piece 28 connected to both side edges of the side plate portion 24 is valley folded from the fold line 27 and folded over onto the side plate portion 26.

[0104] The lid 103 having such an unfoldable structure is assembled as follows: First, the side portions 26 provided on the other two opposing sides of the top plate 22 are folded up along the fold line 25. Next, the side portions 24 provided on the two opposing sides of the top plate 22 are folded up along the fold line 23.

[0105] Next, the overlapping pieces 28 connected to both side edges of the side surface portion 24 are valley-folded along the fold line 27 and folded onto the side surface portion 26, and the protrusions 30 connected to the side edges of the overlapping pieces 28 are valley-folded along the fold line 29 and inserted into the notches 32 provided on the fold line 25 between the top panel portion 22 and the side surface portion 26. In this manner, the assembly of the lid body 103 is completed (see FIG. 11).

[0106] With the lidded box 100 consisting of the assembled box body 102 and lid body 103, when the lid body 103 is placed on the box body 102, the dimension of the inner depth D of the lid body 103 is the same as the height H of the box body 102, so that the open end 33 of the lid body 103 comes into contact with the floor surface 34 (see Figure 12).

[0107] Therefore, the weight applied to the top surface of the box with lid 100 is supported by both the side parts 4, 6 of the box body 102 and the side parts 24, 26 of the lid body 103, increasing the load-bearing strength, and a box with lid 100 can be obtained that is less likely to collapse even when stacked in multiple stages.

[0108] Fig. 13 is a perspective view of a moisture-proof box according to a third embodiment of the present invention, and Fig. 14 is a development view of the moisture-proof box shown in Fig. 13. Box 200 is made from a sheet of moisture-proof corrugated board, i.e., the moisture-proof paper of the present invention. As shown in the development view of Fig. 14, box 200 has first side walls 206 provided on two opposing sides of rectangular bottom 202 via fold lines 204, and second side walls 210 provided on the other two opposing sides of bottom 202 via fold lines 208.

[0109] Between the adjacent first side wall portion 206 and second side wall portion 210, there is provided a folded portion 218 that is connected to both side edges via fold lines 212 and 214 and is formed into a square with both side edges as two sides. The folded portion 218 is folded inward in half along the diagonal line between fold lines 212 and 214 as fold line 216, forming a triangle that is folded toward the inner surface side of the second side wall portion 210.

[0110] A folding piece 224 is provided on the open side of the second side wall portion 210, which is connected via folding lines 220 and 222, and a semicircular recess 226 is formed in the center of the open side of the folding piece 224. Here, the dimension W1 of the second side wall portion 210 and the dimension W2 of the folding piece 224 are formed to be substantially the same dimension.

[0111] The box 200 having such an expanded structure is assembled as follows. First, the first side wall 206 provided on two opposing sides of the bottom 202 is raised by valley folding from the fold line 204, and the second side wall 210 provided on the other two opposing sides of the bottom 202 is raised by valley folding from the fold line 208. In synchronization with the raising of the first side wall 206 and the second side wall 210, the square folded-in portion 218 provided between the adjacent first side wall 206 and second side wall 210 is folded inward in two to form a triangle by mountain folding the diagonal fold line 216 and valley folding the fold lines 212 and 214, and then folded into the inner surface of the second side wall 210. Then, the folded-in piece 224 is folded into the inner surface of the second side wall 210, so that the folded-in portion 218 folded into the inner surface of the second side wall 210 can be held down. In this manner, assembly of the box 200 is completed (see FIG. 13).

[0112] This box 200 can be easily disassembled by inserting fingers into the recesses 226 provided in the folding pieces 224 and lifting them up.

[0113] In the above-mentioned third form of box 200, dimension W1 of second side wall portion 210 and dimension W2 of folding piece 224 are formed to be approximately the same dimension, but may be shorter than dimension W2 as long as it is a dimension that can hold folding portion 218 folded toward the inner surface side of second side wall portion 210.

[0114] When the second type of lid 103 is placed on the box 200, the protruding piece of the lid 103 30 There are 200 boxes First side wall portion 206 The side of the box 200 that does not have the folded piece 224 is First side wall portion 206 The upper part of the cover 103 is a protruding piece. 30 A recess may be formed at a position corresponding to the [Explanation of symbols]

[0115] 1... Moisture-proof box, 2... Bottom, 3... First fold line, 4... First side wall, 5... Second fold line, 6... Second side wall, 7... Third fold line, 8... Fourth fold line, 9... Fifth fold line, 10...Folding part, 11a, 11b...Protruding piece part, 12...Recessed part, 13a, 13b...Protruding part, 14...Sixth fold line, 15...Locking piece part, 16a, 16b...Fitting opening, 17...connecting portion, 18...notch, 20...inner lid, 21...fitting piece, 22...top plate portion, 24, 26...side portion, 28...folding piece, 30...projection piece, 32...notch, 40...outer lid, 41...top plate, 42...folding line, 43...side wall portion, 100...box with lid, 102...box body, 103...lid body, 200...box, 224...folding piece

Claims

1. A method for transporting an item using a moisture-proof box, comprising the steps of: A process of preparing a moisture-proof box having an integral structure with a bottom and side portions all folded in, the moisture-proof box being made from moisture-proof corrugated cardboard, which is transported in a rolled form and has a coating layer on at least one side of a paper base material, and then corrugated with a corrugator, folded and punched, and transported in a sheet form to a place where the moisture-proof box is to be used or near the place where the moisture-proof box is to be used; placing the item in the moisture-proof box; shipping the moisture-proof box containing the items for transport to a point of consumption; Including, The coating layer has a coating weight of 4 g / m ２ 15.5g / m or more ２ and the moisture permeability is 23 (g / m ２ ・24h) or less, A container measuring 28 cm in length, 22 cm in width and 13 cm in depth was prepared using the moisture-proof paper (with the coating layer located on the inside surface), 1.0 L of water was poured into the container, and the container was left for one week in an environment with a temperature of 40°C and a humidity of 80%, after which the seepage of water was observed. If the result was judged according to the waterproofing criteria below, the method was deemed to be waterproof. (Waterproofness criteria) Waterproof: Water does not seep onto the outside of the container or onto the inside of the container above the water level. Waterproof failure: Water has seeped onto the outside of the container or onto the inside of the container above the water level.

2. 2. The method according to claim 1, wherein the coating layer contains a synthetic resin and a wax.

3. 3. The method according to claim 2, wherein the synthetic resin contains at least one of a styrene-based resin, an acrylic-based resin, a butadiene-based resin, a polyolefin-based resin, a polyvinyl alcohol resin, a polylactic acid resin, a polyester-based resin, and a polyethylene-based resin.

4. 4. The method according to claim 2, wherein the wax is a hydrocarbon wax containing paraffin.

5. The moisture-proof box to be manufactured is assembled from one sheet of the moisture-proof paper, and has a first side wall portion connected to two opposing sides of a rectangular bottom portion via a first fold line, and a second side wall portion connected to the other two opposing sides of the bottom portion via a second fold line, and between the adjacent first and second side wall portions, a folded portion is provided that is connected to both side edges via a third fold line and a fourth fold line, respectively, and is formed into a square with the both side edges as two sides, and is folded in half inwardly with the diagonal line between the third fold line and the fourth fold line as a fifth fold line, to form a triangle that is folded toward the inner surface side of the second side wall portion. A protruding piece is provided on the two open sides of the folding portion, and a locking piece is provided on the open side of the second side wall portion via a sixth fold line, and a fitting opening into which the protruding piece provided on the folding portion fits is formed between the locking piece and the second side wall portion, The method according to any one of claims 1 to 4, wherein the engaging piece portion is folded from the sixth fold line to fit into the fitting opening, and the protruding piece portion is provided on the open side of the folded portion folded toward the inner surface side of the second side wall portion.

6. The protruding pieces provided on the two open sides of the fold-in portion are formed by cutting out central portions of the two open sides of the fold-in portion to a depth exceeding the thickness of the moisture-proof paper to form recesses, and protrusions on both sides of the recesses serve as the protruding pieces, and the recesses and the protrusions formed on the two open sides of the fold-in portion are formed to overlap when the fold-in portion is folded in half along the fifth fold line, The locking piece portion provided on the open edge of the second side wall portion has a hole-shaped fitting opening into which one of the two overlapping protrusions fits, and groove-shaped fitting openings are formed on both sides of the hole-shaped fitting opening into which the other protrusion fits, and the hole-shaped fitting opening and the groove-shaped fitting opening form a connection portion that connects to the second side wall portion, and the connection portion has a width that can fit into the recesses formed on the two open edges of the folding portion, and the second side wall portion has a cut that forms a part of the connection portion within a range that does not exceed the depth of the recess, and a line connecting the tips of the cuts forms the sixth fold line. The conveying method described in claim 5.

7. The moisture-proof box further includes an inner lid that covers an opening formed by the two first side walls and the two second side walls, 7. The method according to claim 5, wherein the inner lid is made of the moisture-proof paper.

8. The moisture-proof box further includes an outer lid that covers the opening, The transport method according to claim 7 , wherein the outer lid is made of the moisture-proof paper.

9. The moisture-proof box has a rectangular box body assembled from one sheet of the moisture-proof paper, and a lid assembled from one sheet of the moisture-proof paper that detachably fits around the outer periphery of the box body to cover the side and top opening of the box body, and the height of the box body and the inner depth of the lid are the same as each other.

10. The moisture-proof box is assembled from a sheet of the moisture-proof paper, and has a rectangular bottom with first side wall portions connected to two opposing sides of the bottom via first fold lines, and second side wall portions connected to the other two opposing sides of the bottom via second fold lines, Between the adjacent first side wall portion and the second side wall portion, a folded portion is provided that is connected to both side edges via a third fold line and a fourth fold line, respectively, and is formed into a square with the both side edges as two sides. The folded portion is folded inward in half with the diagonal line between the third fold line and the fourth fold line as a fifth fold line, forming a triangle and folded toward the inner surface side of the second side wall portion. A rectangular foldable piece is provided on the open edge of the second side wall portion via a seventh fold line and an eighth fold line, and the seventh fold line and the eighth fold line are valley-folded to fold the foldable piece toward the inner surface side of the second side wall portion. The conveying method according to any one of claims 1 to 4.

11. The conveying method according to claim 10 , wherein a dimension from the eighth fold line to the open edge of the folded piece is the same as a dimension from the second fold line to the seventh fold line.

Images