Antibacterial and antifungal sheet, packaging body, and method for manufacturing the antibacterial and antifungal sheet

Abstract

To provide an antibacterial anti fungal sheet excellent in antibacterial anti fungal properties.SOLUTION: An antibacterial anti fungal sheet of one embodiment comprises: a base material; and an antibacterial anti fungal layer laminated on a surface of the base material directly or indirectly. The antibacterial anti fungal layer includes; a water repellent varnish including a paraffin wax; and an antibacterial anti fungal agent. The water repellent varnish is preferably, an anionic varnish and has a pH of 7.0 or more and 9.0 or less. The antibacterial anti fungal agent is preferably a pyrithione salt. A lamination amount of the antibacterial anti fungal layer is in terms of a solid content, 1.0 g / m2 or greater and 10.0 g / m2 or less, an average thickness of the antibacterial anti fungal layer is preferably, 5 μm or greater and 10 μm or less. Parker Print Surface smoothness of the surface of the antibacterial anti fungal layer is, preferably 7.00 μm or less. A production method of the antibacteriall anti fungal sheet of one embodiment comprises, a step for indirectly or directly laminating the antibacterial anti fungal layer formed of the coating liquid formed of: the water repellent varnish including the paraffin wax; and the antibacterial anti fungal agent, on the surface of the base material.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an antibacterial and antifungal sheet, a package, and a method for producing the antibacterial and antifungal sheet. [Background technology]

[0002] Inhibiting the growth of bacteria and fungi has long been an important issue for hygienic and comfortable living, and there has been a demand for the addition of antibacterial and antifungal properties to food packaging and sanitary goods materials, as well as food packaging or sanitary goods that use them. Paperboard is used in fields such as food packaging and medical packaging, and in recent years, there has been an increasing demand in these fields for paperboard with antibacterial and antifungal properties.

[0003] Conventional methods for producing antibacterial paperboard include, for example, adding a flocculant to a slurry containing an antibacterial agent and pulp, and then making the resulting paper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 05-32512 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional papermaking method in which a flocculant is added to a slurry containing an antibacterial agent and pulp, the retention of the added chemicals is poor, and the amount of each chemical used is inevitably large. Furthermore, when an antibacterial component is blended into paperboard during the papermaking process, the retention of the antibacterial component in the pulp fibers is low, making it difficult to impart sufficient antibacterial function.

[0006] The present invention has been made in light of the above circumstances, and an object of the present invention is to provide an antibacterial and antifungal sheet having excellent antibacterial and antifungal properties. [Means for solving the problem]

[0007] An antibacterial and antifungal sheet according to one aspect of the present invention comprises a substrate and an antibacterial and antifungal layer laminated directly or indirectly on the surface of the substrate, and the antibacterial and antifungal layer contains a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent.

[0008] A method for producing an antibacterial and antifungal sheet according to another aspect of the present invention includes a step of directly or indirectly laminating an antibacterial and antifungal layer made of a coating liquid containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent onto the surface of a substrate, and the antibacterial and antifungal layer is laminated by a flexographic printing method. [Effects of the Invention]

[0009] According to the present invention, an antibacterial and antifungal sheet having excellent antibacterial and antifungal properties can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiment of the present invention] An antibacterial and antifungal sheet according to one embodiment of the present invention comprises a substrate and an antibacterial and antifungal layer laminated directly or indirectly on the surface of the substrate, the antibacterial and antifungal layer containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent.

[0011] The antibacterial and antifungal sheet includes a substrate and an antibacterial and antifungal layer laminated directly or indirectly on the surface of the substrate. The antibacterial and antifungal layer contains a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent, so that the antibacterial and antifungal layer can maintain its adhesion to the substrate while improving its water repellency, abrasion resistance, and durability. Furthermore, the water-repellent varnish has good dispersibility for the antibacterial and antifungal agent. Therefore, the antibacterial and antifungal sheet has excellent antibacterial and antifungal properties.

[0012] Here, the "antibacterial effect" in the present invention means an effect that conforms to JIS-Z2801 (2012) "Antibacterial processed products - Antibacterial test method, antibacterial effect" and shows an antibacterial activity value of 2.0 or more under conditions such as Escherichia coli and Staphylococcus aureus bacterial solution (1 / 500NB, 24 hours) without water resistance or light resistance treatment.

[0013] The water-repellent varnish is preferably anionic and has a pH of 7.0 or more and 9.0 or less. When the water-repellent varnish is anionic and has a pH of 7.0 or more and 9.0 or less, compatibility with the antibacterial and antifungal agent can be improved, allowing the antibacterial and antifungal agent to be applied uniformly.

[0014] The antibacterial and antifungal agent is preferably a pyrithione salt, which can provide good antibacterial and antifungal effects and also enhance safety.

[0015] The layer amount of the antibacterial and antifungal layer is 1.0 g / m in terms of solid content. 2 More than 10.0g / m 2 It is preferable that the average thickness of the antibacterial and antifungal layer is 5.0 μm or more and 10.0 μm or less. When the layer amount and average thickness of the antibacterial and antifungal layer of the antibacterial and antifungal sheet are within the above ranges, the antibacterial and antifungal effect of the antibacterial and antifungal sheet can be further improved. The "solid content" refers to the sum of all components other than the solvent.

[0016] In the antibacterial and antifungal sheet, the surface of the antibacterial and antifungal layer preferably has a Parker Print Surf smoothness of 7.00 μm or less. When the Parker Print Surf smoothness of the surface of the antibacterial and antifungal layer is within this range, the antibacterial and antifungal sheet has increased surface smoothness, thereby further improving abrasion resistance and durability.

[0017] The Parker Print Surf smoothness (hereinafter also referred to as "PPS smoothness") of the surface of the antibacterial and antifungal layer is the Parker Print Surf smoothness (μm) measured in accordance with Appendix A of JIS-P8151 (2004). The Parker Print Surf smoothness is measured using a device that determines smoothness from the amount of air flow, but by applying pressure to the measuring head, it is possible to measure smoothness under pressure. The Parker Print Surf smoothness is a value measured using a soft-type backing at a clamp pressure of 1.0 MPa, and can be used to evaluate microscopic surface smoothness.

[0018] The antibacterial and antifungal sheet is preferably an antibacterial and antifungal cardboard liner, which makes it suitable for use as packaging material, medical packaging material, food packaging material, packaging material for mailing and transportation, etc.

[0019] A package according to one aspect of the present invention includes the antibacterial and antifungal sheet, and by including the antibacterial and antifungal sheet, the package has excellent antibacterial and antifungal properties.

[0020] A method for producing an antibacterial and antifungal sheet according to another aspect of the present invention includes a step of directly or indirectly laminating an antibacterial and antifungal layer composed of a water-repellent varnish containing paraffin wax and a coating liquid containing an antibacterial and antifungal agent onto the surface of a substrate, the antibacterial and antifungal layer being laminated by flexographic printing. This method for producing an antibacterial and antifungal sheet includes a step of directly or indirectly laminating an antibacterial and antifungal layer composed of a water-repellent varnish containing paraffin wax and a coating liquid containing an antibacterial and antifungal agent onto the surface of a substrate, thereby maintaining the adhesion of the antibacterial and antifungal layer to the substrate while improving the water repellency, abrasion resistance, and durability of the antibacterial and antifungal layer. Furthermore, because the antibacterial and antifungal layer is laminated by flexographic printing, an antibacterial and antifungal layer composed of a convex halftone dot pattern can be formed. As a result, the antibacterial and antifungal layer can be uniformly formed and its thickness and specific surface area can be increased, resulting in an antibacterial and antifungal layer with excellent abrasion resistance and durability.

[0021] In the method for producing the antibacterial and antifungal sheet, the lamination amount of the antibacterial and antifungal layer is 1.0 g / m in terms of solid content. 2 More than 10.0g / m 2 Preferably, the average thickness of the antibacterial and antifungal layer is 5.0 μm or more and 10.0 μm or less. When the layer amount and average thickness of the antibacterial and antifungal layer of the antibacterial and antifungal sheet are within the above ranges, the antibacterial and antifungal effect of the antibacterial and antifungal sheet can be further improved.

[0022] In the method for producing the antibacterial and antifungal sheet, the anilox roll of the flexographic printing machine used in the flexographic printing method preferably has a line frequency of 150 to 300 lines per inch. By setting the line frequency engraved on the cylindrical surface of the anilox roll of the flexographic printing machine within this range, the thickness of the antibacterial and antifungal layer of the produced antibacterial and antifungal sheet is increased, thereby further improving the abrasion resistance and durability of the antibacterial and antifungal layer.

[0023] In the method for producing the antibacterial and antifungal sheet, the laminating step is preferably carried out multiple times. By carrying out the laminating step multiple times in the production of the antibacterial and antifungal sheet, the antibacterial and antifungal effect of the antibacterial and antifungal sheet can be further improved.

[0024] [Details of the embodiment of the present invention] The present invention will be described in detail below. The following description of the components may be based on representative embodiments and specific examples, but the present invention is not limited to such embodiments.

[0025] <Antibacterial and anti-fungal sheet> The antibacterial and antifungal sheet includes a substrate and an antibacterial and antifungal layer laminated directly or indirectly on the surface of the substrate. When the substrate is a paper substrate, the antibacterial and antifungal sheet may further include a printed layer on the surface of the substrate, and the antibacterial and antifungal layer may be laminated on the surface of the printed layer.

[0026] [Base material] Examples of the substrate include paper (such as paperboard, printing paper, packaging paper, and synthetic paper), nonwoven fabric, general-purpose thermoplastic films and thin plates such as polyethylene film, polypropylene film, and polyester film, thin plates coated with metal foil, and metal plates. The substrate may be a single layer or multiple layers. From the viewpoints of printability and ease of processing into packaging, it is particularly preferable that the substrate be a cardboard liner.

[0027] When the substrate is paper (paper substrate), the paper substrate is a layer obtained by papermaking, primarily composed of pulp fibers. The pulp fibers are not particularly limited, and examples include wood pulps such as unbleached softwood kraft pulp (NUKP), bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP), and bleached softwood sulfite pulp (NBSP). These wood pulps can also be used as the primary material in combination with non-wood pulps such as hemp, cotton, straw, and kenaf, as well as synthetic pulps made from polyethylene, polypropylene, and polyacrylonitrile. Other organic synthetic fibers, such as acrylic fiber, rayon fiber, polyester fiber, and polyamide fiber, and inorganic fibers, such as glass fiber, carbon fiber, alumina fiber, silica-alumina silicate fiber, and rock wool, can also be used in combination.

[0028] The paper base material contains a paper strength agent and a sizing agent. Other components that may be contained in the paper base material include, for example, sizing agents, paper strength agents, dyes, pigments, retention aids, fillers, pH adjusters, slime control agents, thickeners, preservatives, antifungal agents, and flame retardants. These can be used alone or in combination of two or more.

[0029] The basis weight of the paper substrate is not particularly limited, but is, for example, 10 g / m 2 More than 1200g / m 2 and can be less than 100 g / m 2 More than 400g / m 2By setting the basis weight of the paper base material within the above range, it is possible to improve the heat insulating properties, processability, etc.

[0030] [Antibacterial and antifungal layer] The antibacterial and antifungal layer contains a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent.

[0031] (Water-repellent varnish) The water-repellent varnish contains paraffin wax, which can improve water repellency.

[0032] The water-repellent varnish is preferably anionic and has a pH of 7.0 or more and 9.0 or less. When the water-repellent varnish is anionic and has a pH of 7.0 or more and 9.0 or less, compatibility with the antibacterial and antifungal agent can be improved, allowing the antibacterial and antifungal agent to be applied uniformly.

[0033] The water-repellent varnish preferably does not contain silicone. If the water-repellent varnish contains silicone, the adhesion between the substrate and the antibacterial and antifungal layer may be reduced. Furthermore, since the antibacterial and antifungal layer exhibits lubricity, water repellency, and oil repellency, the lamination property may be deteriorated when the layer is processed into a cardboard case or other packaging material.

[0034] (Antibacterial and antifungal agent) The antibacterial and antifungal agent used in the present invention is a drug having an antibacterial effect effective against bacteria and an antifungal effect effective against fungi. The antibacterial effect includes, for example, the effect of inhibiting or killing the growth of bacteria. The antifungal effect includes, for example, the effect of inhibiting the growth or germination of fungi. Examples of the antibacterial and antifungal agent include pyrithione-based, benzimidazole-based, isothiazolin-based, organic arsenic-based, organic copper-based, organic iodine-based, and organic silver-based antibacterial and antifungal agents. Among these, pyrithione salts of pyrithione-based antibacterial and antifungal agents are preferred. When the antibacterial and antifungal agent is a pyrithione salt, good antibacterial and antifungal effects can be obtained and safety can be improved.

[0035] The lower limit of the coating amount (solid content equivalent) of water-repellent varnish is 0.5 g / m 2 is preferred, and 2.0 g / m 2 On the other hand, the upper limit of the coating amount is 10.0 g / m 2 is preferred, and 8.0 g / m 2 If the coating amount of the water-repellent varnish is less than the above lower limit, sufficient abrasion resistance may not be obtained. If the coating amount of the water-repellent varnish is more than the above upper limit, uniform dispersion of the antibacterial and antifungal agent may be reduced.

[0036] The lower limit of the coating amount (solid content equivalent) of the antibacterial and antifungal agent is 0.05 g / m 2 is preferred, and 0.10 g / m 2 On the other hand, the upper limit of the coating amount of the antibacterial and antifungal agent is 0.80 g / m 2 is preferred, and 0.70 g / m 2 If the coating amount of the antibacterial and antifungal agent does not satisfy the above lower limit, a sufficient antibacterial and antifungal effect may not be obtained. If the coating amount of the antibacterial and antifungal agent exceeds the above upper limit, the antibacterial and antifungal effect may not be further improved, and there is a risk of increased production costs and reduced dispersibility in the coating layer.

[0037] The lower limit of the mass ratio of the water-repellent varnish to the antibacterial and antifungal agent, calculated on a solid content basis, is preferably 5, more preferably 6. On the other hand, the upper limit of the mass ratio of the water-repellent varnish to the antibacterial and antifungal agent, calculated on a solid content basis, is preferably 100, more preferably 90, and even more preferably 80. If the mass ratio of the water-repellent varnish to the antibacterial and antifungal agent, calculated on a solid content basis, is less than the lower limit, abrasion resistance may decrease. On the other hand, if the mass ratio of the water-repellent varnish to the antibacterial and antifungal agent, calculated on a solid content basis, exceeds the upper limit, uniform dispersibility of the antibacterial and antifungal agent may decrease.

[0038] In addition to the water-repellent varnish and antibacterial and antifungal agent, the antibacterial and antifungal layer (coating liquid) may contain, as needed, an antifoaming agent, a coloring pigment, a coloring dye, a surfactant, an ink fixing agent, a sizing agent, a fluorescent brightening agent, a viscosity modifier, a lubricant, and the like.

[0039] The lower limit of the layer amount (solid content equivalent) of the antibacterial and antifungal layer is 1.0 g / m 2 is preferred, and 2.0 g / m 2 On the other hand, the upper limit of the coating amount (in terms of solid content) of the antibacterial and antifungal layer is 10.0 g / m 2 is preferred, and 8.0 g / m 2 If the coating weight of the antibacterial and antifungal layer is less than the above lower limit, sufficient antibacterial and antifungal effects may not be obtained, whereas if the coating weight of the antibacterial and antifungal layer is more than the above upper limit, the processability of the antibacterial and antifungal sheet may be reduced.

[0040] The lower limit of the average thickness of the antibacterial and antifungal layer is preferably 5.0 μm, more preferably 5.5 μm. Meanwhile, the upper limit of the average thickness of the antibacterial and antifungal layer is preferably 10.0 μm, more preferably 11.0 mm. If the average thickness of the antibacterial and antifungal layer is less than the lower limit, sufficient antibacterial and antifungal effects may not be obtained. On the other hand, if the average thickness of the antibacterial and antifungal layer exceeds the upper limit, the processability of the antibacterial and antifungal sheet may be reduced. The term "average thickness of the antibacterial and antifungal layer" refers to the average value of the average thickness of the antibacterial and antifungal layer at any 10 points.

[0041] (Parker Print Surf Smoothness) The upper limit of the Parker Print Surf smoothness of the surface of the antibacterial and antifungal layer is preferably 7.00 μm, more preferably 6.76 μm. If the Parker Print Surf smoothness of the surface of the antibacterial and antifungal layer laminated surface exceeds the upper limit, there is a risk of blocking when the antibacterial and antifungal layers come into contact with each other. The lower limit of the Parker Print Surf smoothness of the surface of the heat seal layer laminated surface is 3.8 μm, preferably 5.0 μm. If the Parker Print Surf smoothness of the surface of the heat seal layer laminated surface of the paper base material is below the lower limit, there is a risk of poor adhesion at small irregularities.

[0042] When antibacterial and antifungal layers are laminated on both sides of the substrate, the components, coating amount, etc. of each antibacterial and antifungal layer may be as described above.

[0043] (Printing layer) When the substrate of the antibacterial and antifungal sheet is a paper substrate, the sheet may further include a printed layer below the antibacterial and antifungal layer. When printing on paper at high speed and in large quantities, the printed layer is formed by offset printing, for example, while when printing individual information on the paper, the printed layer is formed by an inkjet method, for example. The printed layer can also be formed by a known printing method such as flexographic printing or gravure printing.

[0044] The antibacterial and antifungal sheet is preferably an antibacterial and antifungal cardboard liner, which makes it suitable for use as packaging material, medical packaging material, food packaging material, packaging material for mailing and transportation, etc.

[0045] The antibacterial and antifungal sheet can improve the water repellency, abrasion resistance, and durability of the antibacterial and antifungal layer while maintaining adhesion of the antibacterial and antifungal layer to the substrate. Furthermore, the water-repellent varnish has good dispersibility of the antibacterial and antifungal agent. Therefore, the antibacterial and antifungal sheet has excellent antibacterial and antifungal properties.

[0046] <Method for manufacturing antibacterial and antifungal sheets> The method for producing the antibacterial and antifungal sheet includes a step of directly or indirectly laminating an antibacterial and antifungal layer composed of a coating liquid containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent on the surface of a substrate. The method for producing the antibacterial and antifungal sheet may also include a step of making a pulp slurry, which is the raw material for the paper substrate. In the papermaking step, a raw material slurry containing the above-mentioned raw material pulp, oil-proofing agent, and other additives is made using a known papermaking machine. The method for producing the antibacterial and antifungal sheet may also include a step of forming a printed layer on the surface of the substrate by offset printing, gravure printing, flexographic printing, inkjet printing, or the like.

[0047] [Antibacterial and antifungal layer lamination process] This process includes a step of directly or indirectly laminating an antibacterial and antifungal layer on the surface of the substrate. The antibacterial and antifungal layer is made of a coating liquid (antibacterial and antifungal layer composition) containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent. The antibacterial and antifungal layer can be laminated by, for example, flexographic printing, offset printing, or gravure printing. Among these, flexographic printing is preferred. By laminating the antibacterial and antifungal layer by flexographic printing, an antibacterial and antifungal layer consisting of a convex halftone dot pattern can be formed. As a result, the antibacterial and antifungal layer can be formed uniformly and its thickness and specific surface area can be increased, thereby further improving the abrasion resistance and durability of the antibacterial and antifungal layer.

[0048] The details of the water-repellent varnish containing paraffin wax and the antibacterial and antifungal agent contained in the coating liquid are as described above, and therefore will not be described here. In addition to the water-repellent varnish and the antibacterial and antifungal agent, the coating liquid may also contain, as needed, antifoaming agents, color pigments, color dyes, surfactants, ink fixers, sizing agents, fluorescent whitening agents, viscosity modifiers, lubricants, and the like.

[0049] Flexographic printing is a letterpress printing method using a flexographic printing press equipped with a relief printing plate roll made of rubber or resin, an anilox roll with fine parallel cells engraved on its surface, and an impression roll that applies low pressure when transferring from the printing plate roll to the printing substrate. First, the coating liquid that will become the water-based ink is supplied to the anilox roll from a fountain roll (rubber roll) or doctor chamber. The temperature of the supplied coating liquid is adjusted in a heating tank depending on the outside temperature, etc. Next, the anilox roll transfers a fixed amount of the coating liquid to the printing plate roll. Then, an antibacterial and antifungal layer is laminated on the surface of the paper substrate that passes between the printing plate roll and the impression roll.

[0050] The lower limit of the line ruling of the anilox roll of the flexographic printing machine used in the flexographic printing method in the antibacterial and antifungal layer lamination step is preferably 150 lines / inch, more preferably 165 lines / inch. On the other hand, the upper limit of the line ruling is not particularly limited, but is preferably 300 lines / inch, more preferably 200 lines / inch. By setting the line ruling engraved on the cylindrical surface of the anilox roll of the flexographic printing machine within the above range, the thickness of the antibacterial and antifungal layer of the antibacterial and antifungal sheet produced is increased, thereby further improving the abrasion resistance and durability of the antibacterial and antifungal layer. If the line ruling is below the above lower limit, the antibacterial and antifungal coating liquid may be scattered. On the other hand, if the line ruling is above the above upper limit, transfer defects (uneven coating) may be more likely to occur.

[0051] In the method for producing the antibacterial and antifungal sheet, it is preferable to perform the lamination step multiple times. The antibacterial and antifungal sheet can be coated with the coating liquid for the antibacterial and antifungal layer multiple times. By coating the coating liquid for the antibacterial and antifungal layer multiple times, the antibacterial and antifungal effect of the antibacterial and antifungal sheet can be further improved.

[0052] This method for producing an antibacterial and antifungal sheet includes a step of directly or indirectly laminating an antibacterial and antifungal layer composed of a coating liquid containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent onto the surface of a substrate. This allows the antibacterial and antifungal layer to maintain adhesion to the substrate while improving its water repellency, abrasion resistance, and durability. Furthermore, since the antibacterial and antifungal layer is laminated using a flexographic printing method, it is possible to form an antibacterial and antifungal layer consisting of a convex halftone dot pattern. As a result, the antibacterial and antifungal layer can be formed uniformly and its thickness and specific surface area can be increased, resulting in an antibacterial and antifungal layer with excellent abrasion resistance and durability.

[0053] <Package> A package according to another embodiment of the present invention includes the antibacterial and antifungal sheet. Because the package includes the antibacterial and antifungal sheet, it has excellent antibacterial and antifungal properties. The package is suitable for, for example, cots, separators, emergency supplies such as emergency preparedness supplies, packaging materials for shipping, medical packaging materials, food packaging materials, and packaging materials for mailing and transportation.

[0054] <Other embodiments> The present invention is not limited to the above-described embodiment, and can be implemented in various other forms, including those described above, with various modifications and improvements. [Example]

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

[0056] [Examples 1 to 9] (base material) A paper base material (basis weight 170 g / m) was made by papermaking using a pulp slurry consisting of 100% recycled corrugated cardboard pulp, to which a paper strength agent and an internal sizing agent were added. 2 As a result, a cardboard liner base paper of 100g was obtained.

[0057] (Antibacterial and antifungal layer) (1) Adjustment of coating liquid The coating liquids of Examples 1 to 9 were prepared using a water-repellent varnish containing paraffin wax ("Brightone FC350, ionic: anionic, pH: 8.0" manufactured by Sakata Inx Corporation) and an antibacterial and antifungal agent ("Amorden PT-50, main component: pyrithione salt" manufactured by Yamato Chemical Industry Co., Ltd.). The water-repellent varnish was weakly alkaline, with a pH of 8.0. The mass ratio (in terms of solid content) of the antibacterial and antifungal agent to the water-repellent varnish in the coating liquids of Examples 1 to 9 is shown in Table 1 below.

[0058] (2) Flexographic printing The coating liquid was applied to a paper substrate using a flexographic printer to form an antibacterial and antifungal layer in the amount shown in Table 1 in terms of solid content. The flexographic printing conditions are as follows: The anilox roll ruling (lines / inch) and the number of prints are shown in Table 1. Coating fluid supply: Doctor chamber method Coating liquid temperature: 25℃ Printing speed: 130m / min

[0059] [Comparative Examples 1 to 3] Oxidized starch for papermaking and the same antibacterial and antifungal agent as in the Examples were used to prepare coating solutions for Comparative Examples 1 to 3. The mass ratios (in terms of solid content) of the antibacterial and antifungal agent to starch in the coating solutions for Comparative Examples 1 to 3 are shown in Table 1 below. The water-repellent varnishes and their contents (parts by mass) are shown in Table 3. Next, the surface of the paper substrate used in the examples after the papermaking process was coated with the layer amount shown in Table 1 in terms of solid content to form an antibacterial and antifungal layer.

[0060] [evaluation] The antibacterial and antifungal sheets of Examples 1 to 9 and Comparative Examples 1 to 3 were evaluated by the following methods.

[0061] <Parker Print Surf Smoothness> The Parker Print Surf smoothness was measured in accordance with Appendix A of JIS-P8151 (2004).

[0062] <Antibacterial reactivity test> A 0.2 ml drop of a reagent that reacts with the metal component contained in the antibacterial and antifungal agent was applied to the surface of the antibacterial and antifungal sheets of Examples 1 to 9 and Comparative Examples 1 to 3, and antibacterial reactivity was evaluated as antibacterial ability. The time until the antibacterial reaction was observed after the above reagent was applied was measured and evaluated using the following four-point scale. The shorter the reaction time, the more the antibacterial and antifungal agent had accumulated and remained on the surface of the antibacterial and antifungal sheet, and the higher the antibacterial and antifungal performance was judged to be. (Evaluation criteria) A: Less than 11 seconds B: 11 seconds or more but less than 21 seconds C: 21 seconds or more but less than 100 seconds D: 100 seconds or more or no reaction observed (antibacterial performance cannot be expected due to the small amount of antibacterial and antifungal agent on the surface)

[0063] <Wear resistance test> 0.2 ml of a reagent that reacts with the metal components contained in the antibacterial and antifungal agent was dropped onto the rubbed areas of the antibacterial and antifungal sheets of Examples 1 to 9 and Comparative Examples 1 to 3, which had been treated under the following conditions 1 or 2, and the antibacterial ability was evaluated from the standpoint of abrasion resistance. The time until the antibacterial reaction was observed after the above-mentioned reagent was dropped was measured and evaluated on the following four-point scale. (1) Processing condition 1 In accordance with JIS-P8136 (1994) "Testing method for abrasion resistance of paperboard," the surface of the antibacterial and antifungal layer was rubbed against the surface without the antibacterial and antifungal layer five times under a load of 500 g, and then 0.2 ml of a reagent that reacts with the metal components contained in the antibacterial and antifungal agent was dropped onto the surface of the antibacterial and antifungal sheet to evaluate the antibacterial reactivity as antibacterial ability. (2) Processing condition 2 In accordance with JIS-P8136 (1994) "Testing method for abrasion resistance of paperboard," the surface of the antibacterial and antifungal layer was rubbed against the surface without the antibacterial and antifungal layer 20 times under a load of 500g, and then 0.2ml of a reagent that reacts with the metal components contained in the antibacterial and antifungal agent was dropped onto the surface of the antibacterial and antifungal sheet to evaluate the antibacterial reactivity as antibacterial ability. (Evaluation criteria) A: Less than 11 seconds B: 11 seconds or more but less than 21 seconds C: 21 seconds or more but less than 100 seconds D: 100 seconds or more or no reaction observed (antibacterial performance cannot be expected due to the small amount of antibacterial and antifungal agent on the surface)

[0064] <Durability test> 0.2 ml of a reagent that reacts with the metal component contained in the antibacterial and antifungal agent was dropped onto the folded portions of the antibacterial and antifungal sheets of Examples 1 to 9 and Comparative Examples 1 to 3, which had been treated under Condition 1 or Condition 2 below, and the antibacterial ability was evaluated from the perspective of durability. The time until the antibacterial reaction was observed after dropping the reagent was measured and evaluated using the following four-point scale. The shorter the reaction time, the more the antibacterial and antifungal agent had accumulated and remained on the surface of the antibacterial and antifungal sheet, and the higher the antibacterial and antifungal performance was judged to be. (1) Processing condition 1 In accordance with JIS-P8115 (2001) "Paper and paperboard folding endurance test method," the test piece was used, which was stopped after being folded left and right five times. (2) Processing condition 2 In accordance with JIS-P8115 (2001) "Paper and paperboard folding endurance test method," the test piece was used, which had been stopped after being folded left and right 20 times.

[0065] The measurement results and evaluation results are shown in Table 1.

[0066] [Table 1]

[0067] As shown in Table 1, Examples 1 to 9 are provided with an antibacterial and antifungal layer laminated on the surface of the substrate, and the antibacterial and antifungal layer contains a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent, which shows excellent effects in antibacterial reactivity, as well as abrasion resistance and durability in the antibacterial action.Furthermore, as shown in Comparative Examples 1 to 3, when an antibacterial and antifungal layer containing oxidized starch and an antibacterial and antifungal agent is provided on the surface of the substrate using the film transfer method of a paper machine, the abrasion resistance and durability in the antibacterial action were inferior.

[0068] The above results demonstrate that the antibacterial and antifungal sheet has excellent antibacterial and antifungal properties and that the antibacterial and antifungal effects are highly durable. The antibacterial and antifungal sheet can be suitably used for packaging in medical, food, disaster prevention, mailing, and transportation applications.

Claims

1. A substrate; an antibacterial and antifungal layer laminated directly or indirectly on the surface of the substrate; Equipped with the antibacterial and antifungal layer contains a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent; the antibacterial and antifungal agent is a pyrithione salt, the coating amount of the antibacterial and antifungal agent is 0.20 g / m 2 or more and 0.35 g / m 2 or less in terms of solid content; the coating amount of the water-repellent varnish is 4.45 g / m 2 or more and 7.00 g / m 2 or less in terms of solid content; The antibacterial and antifungal sheet has a mass ratio of the water-repellent varnish to the antibacterial and antifungal agent of 12 or more and 35 or less in terms of solid content.

2. 2. The antibacterial and antifungal sheet according to claim 1, wherein the water-repellent varnish is anionic and has a pH of 7.0 or more and 9.0 or less.

3. The laminated amount of the antibacterial and antifungal layer is 4.8 g / m in terms of solid content. ２ 7.2g / m or more ２ is as follows:

3. The antibacterial and antifungal sheet according to claim 1, wherein the average thickness of the antibacterial and antifungal layer is 7.2 μm or more and 8.6 μm or less.

4. 4. The antibacterial and antifungal sheet according to claim 1, wherein the surface of the antibacterial and antifungal layer has a Parker Print Surf smoothness of 7.00 μm or less.

5. 5. The antibacterial and antifungal sheet according to claim 1, which is an antibacterial and antifungal liner for cardboard.

6. A package comprising the antibacterial and antifungal sheet according to any one of claims 1 to 5.

7. The method comprises a step of directly or indirectly laminating an antibacterial and antifungal layer made of a coating liquid containing a water-repellent varnish containing paraffin wax and an antibacterial and antifungal agent on the surface of a substrate, the antibacterial and antifungal agent is a pyrithione salt, the coating amount of the antibacterial and antifungal agent is 0.20 g / m 2 or more and 0.35 g / m 2 or less in terms of solid content; the coating amount of the water-repellent varnish is 4.45 g / m 2 or more and 7.00 g / m 2 or less in terms of solid content; a mass ratio of the water-repellent varnish to the antibacterial and antifungal agent, calculated as a solid content, of 12 to 35; A method for producing an antibacterial and antifungal sheet, wherein the antibacterial and antifungal layer is laminated by a flexographic printing method.

8. The laminated amount of the antibacterial and antifungal layer is 4.8 g / m in terms of solid content. ２ 7.2g / m or more ２ is as follows: The method for producing an antibacterial and antifungal sheet according to claim 7, wherein the average thickness of the antibacterial and antifungal layer is 7.2 μm or more and 8.6 μm or less.

9. 9. The method for producing an antibacterial and antifungal sheet according to claim 7 or 8, wherein the anilox roll of the flexographic printing machine used in the flexographic printing method has a line count of 150 lines / inch or more and 300 lines / inch or less.

10. The method for producing an antibacterial and antifungal sheet according to any one of claims 7 to 9, wherein the laminating step is carried out a plurality of times.

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