cardboard

Abstract

To provide a cardboard that does not have the fragrance of an air freshener and is capable of deodorizing multiple malodorous components. [Solution] The problem is solved by a paperboard having a chemical deodorizing region on at least one surface of the paper substrate, which is coated with a chemical deodorizer that chemically deodorizes odors, and an adsorption deodorizing region on which an adsorption deodorizer that deodorizes odors by adsorption is coated, wherein the chemical deodorizing region and the adsorption deodorizing region have areas that do not overlap with each other.

Description

[Technical Field]

[0001] This invention relates to cardboard, and more particularly to cardboard having the function of reducing odor. [Background technology]

[0002] The spaces that require deodorizers are diverse, including living spaces such as accommodations and residences, work spaces such as offices, and commercial spaces such as markets and supermarkets. Furthermore, the malodorous components that deodorizers target in these spaces are also diverse.

[0003] On the other hand, deodorizers are generally used by applying them to a base material, as they are in liquid or powder form. Therefore, it is desirable to use materials and components of products that exist in various spaces as described above as the base material. One such base material is cardboard. Cardboard is used, for example, as a component of household goods such as corrugated cardboard boxes, packaging materials, and tissue paper cartons, as well as in paper processed products and their components such as assembled pet toilets and partitions. It is used as a material and component of products that exist in various spaces where odor elimination is necessary. By using cardboard with deodorizing properties, it becomes possible to manufacture household goods and paper processed products that have deodorizing functions tailored to various spaces and odor components.

[0004] Incidentally, odors that volatilize into various spaces such as indoors are often mixtures of multiple malodorous substances. For example, they are mixtures of amines such as trimethylamine and ammonia, which are representative of the smell of urine and rotting fish, and sulfides such as hydrogen sulfide and methyl mercaptan, which are representative of the smell of rotten eggs, feces, and rotting onions.

[0005] Methods for eliminating and reducing such unpleasant odors include chemical deodorization, which neutralizes odor components using neutralization reactions; adsorption deodorization, which adsorbs odor components using adsorption reactions; and sensory deodorization, which masks unpleasant odors or modifies them into other odors using fragrances such as air fresheners.

[0006] Sensory deodorization focuses on the fragrance of malodors and is excellent in that it can deodorize regardless of the pH of the malodor components. However, there are people who do not find the fragrance from air fresheners and the like pleasant. Therefore, it is easy to use in small spaces with short stay times such as toilet spaces and entrances, but it is not necessarily a deodorization method that is easily applicable in many spaces.

[0007] In contrast, chemical deodorization and adsorption deodorization have the advantage that, depending on the choice of deodorant, they can exhibit a deodorizing function without generating odors, are easy to use in various spaces and applications, and have high versatility.

[0008] However, chemical deodorization using a neutralization reaction decomposes malodor components into other substances. Therefore, the odors that can be deodorized are limited to the malodor components that react with the deodorant in the malodor. For example, acidic deodorants are effective against alkaline malodor components, but it is difficult to decompose acidic malodor components and deodorize them sufficiently. Also, alkaline deodorants are effective against acidic malodor components, but it is difficult to decompose and deodorize alkaline and acidic malodor components. On the other hand, in adsorption deodorization, since the malodor components themselves are not decomposed, there is a possibility that the malodor components adsorbed by the deodorant may be released due to changes in the surrounding environment. Also, in chemical deodorization and physical deodorization, the time required for deodorization is different, so it is necessary to use them appropriately according to the deodorization time.

[0009] As described above, since malodors volatilized in various spaces such as indoors are often a mixture of multiple malodors, it is desirable to use a combination of acidic / alkaline chemical deodorization and adsorption deodorization.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] On the other hand, methods for applying deodorizers related to chemical deodorization or adsorption deodorization to paperboard include adding the deodorizer to the papermaking raw materials during the papermaking process and applying it to the paper surface after papermaking.

[0012] However, when attempting to use both acidic and alkaline chemical deodorizers, whether by adding them to the papermaking raw materials or coating them onto the paper surface, contact between the deodorizers will result in a neutralization reaction between their components, drastically reducing the effectiveness of one of the deodorizers. Furthermore, since many adsorbent deodorizers are in powder or solid form, attempting to use both chemical and adsorbent deodorizers makes it difficult to bind and support the adsorbent deodorizer to the pulp fibers, whether by adding it to the papermaking raw materials or coating it onto the paper surface. Additionally, if a binder is used to support the adsorbent deodorizer when adding it to the papermaking raw materials or simply coating it, the binder may mask the chemical deodorizer, preventing it from fully exerting its effect.

[0013] Furthermore, the demand for paper requiring deodorizing properties is limited, and the amount and proportion of deodorizer added must be flexibly adjusted according to the desired deodorizing effect. Therefore, mass production methods such as papermaking are not suitable. In addition, when deodorizers are added to the papermaking raw materials, it is difficult to adjust the paper's texture and strength, making flexible design changes impossible.

[0014] Therefore, the main objective of the present invention is to provide a deodorizing paperboard that does not have the fragrance of an air freshener, can deodorize multiple malodorous components, is highly versatile, and is easy to manufacture and modify in terms of its deodorizing effect. [Means for solving the problem]

[0015] The first solution to the above problem was, On at least one surface of the paper substrate, A chemical deodorizing area is provided with a chemical deodorizer that chemically eliminates odors, It has an adsorption deodorizing region to which an adsorption deodorizing agent is applied to deodorize odors by adsorption, The chemical deodorizing region and the adsorption deodorizing region have regions that do not overlap with each other. A cardboard characterized by the following features.

[0016] The second method is, The ratio of the area of ​​the region where the chemical deodorizing region and the adsorption deodorizing region do not overlap with the area of ​​the aforementioned one surface is 80% or more. This is the cardboard related to the first method described above.

[0017] The third option is, The aforementioned chemical deodorization area is The cardboard relating to the first or second means described above is an acidic deodorizing region to which an acidic deodorizing agent has been applied, or an alkaline deodorizing region to which an alkaline deodorizing agent has been applied.

[0018] The fourth method is, The aforementioned chemical deodorization area is Acidic deodorizing area with added acidic deodorizer, It has an alkaline deodorizing region to which an alkaline deodorizing agent is applied, The acidic deodorizing region and the alkaline deodorizing region have regions that do not overlap with each other. The cardboard relating to the first or second means is such that the ratio of the area of ​​the region where the chemical deodorizing region and the adsorption deodorizing region do not overlap with each other to the area of ​​the chemical deodorizing region is 80% or more.

[0019] The fifth method is, The adsorption and deodorizing region is formed by a coating layer containing inorganic particles and a styrene-acrylic copolymer binder, and is a cardboard according to the first to fourth means described above.

[0020] The sixth method is, The acidic deodorant is a cardboard according to the third or fourth means described above, containing at least one of an organic acid and an organic salt.

[0021] The seventh method is, The alkaline deodorant is a cardboard according to the third or fourth means described above, containing sodium hydroxide and polyamine polycarboxylic acid.

[0022] The eighth method is, The cardboard according to the first to seventh means described above, wherein the static friction coefficient of the surface having the chemical deodorizing region and the adsorption deodorizing region is 0.15 or more and 0.25 or less.

[0023] According to the present invention, it is possible to provide a deodorizing paperboard that does not have the fragrance of an air freshener, can deodorize multiple malodorous components, is highly versatile, and is easy to manufacture and modify in terms of its deodorizing effect. [Brief explanation of the drawing]

[0024] [Figure 1] This is a plan view of a cardboard sheet according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view of a paperboard according to an embodiment of the present invention. [Figure 3] This is a plan view of another example of a cardboard according to an embodiment of the present invention. [Figure 4] This is a cross-sectional view of another example of a paperboard according to an embodiment of the present invention. [Figure 5] This is a plan view of another example of a cardboard according to an embodiment of the present invention. [Figure 6] This is a plan view of yet another example of a cardboard according to an embodiment of the present invention. [Figure 7] This figure illustrates an example of the manufacturing process for paperboard according to an embodiment of the present invention. [Figure 8] This figure illustrates an example of paperboard manufacturing according to an embodiment of the present invention. [Modes for carrying out the invention]

[0025] Embodiments of the present invention will be described below with reference to Figures 1 to 8. However, the present invention is not limited to these embodiments.

[0026] The cardboard of this embodiment may be in roll form or sheet form. Furthermore, the cardboard of this embodiment is not limited to specific uses and can be used in known uses of cardboard. For example, it can be used as part of corrugated cardboard by laminating it with a core, such as a corrugated cardboard liner. In addition, it can be used in its cardboard form or as the aforementioned corrugated cardboard form as material for paper boxes such as machine parts, cosmetic boxes for food and daily necessities, packaging boxes, transport boxes, tissue paper cartons, paper containers and paper processed products, base materials for printed materials such as posters, covers for publications such as books, covers for stationery such as binder files, partitions, corrugated cardboard bedding (beds), assembly toilets, assembly pet toilets, and packaging materials.

[0027] As shown in Figures 1, 2, 3, and 4, the cardboard of this embodiment has a chemical deodorizing region on at least one side of the paper substrate where a chemical deodorizer is applied, and an adsorption deodorizing region where an adsorption deodorizer is applied. The forms shown in Figures 1 and 2 use either an acidic deodorizer or an alkaline deodorizer as the chemical deodorizer, and have only one of either an acidic deodorizing region provided by the acidic deodorizer or an alkaline deodorizing region provided by the alkaline deodorizer. The forms shown in Figures 3 and 4 use both an acidic deodorizer and an alkaline deodorizer as the chemical deodorizer, and have both an acidic deodorizing region provided by the acidic deodorizer and an alkaline deodorizing region provided by the alkaline deodorizer. The illustrated forms show a configuration in which the chemical deodorizing region and the adsorption deodorizing region are on only one side of the paper substrate, but the chemical deodorizing region and the adsorption deodorizing region may be on both sides of the paper substrate.

[0028] The cardboard of this embodiment has separate areas for chemical deodorants and adsorbent deodorants, each with a different deodorizing mechanism. Chemical deodorants deodorize by neutralizing odor-causing substances, and while the components targeted for deodorization are limited to those that chemically react with the deodorant, they generally exhibit a high deodorizing effect against specific components targeted for deodorization. In contrast, adsorbent deodorants can deodorize a wide range of components, including those targeted by chemical deodorants, as long as they are adsorbable components, even those that do not neutralize with the chemical deodorant. Furthermore, adsorbent deodorants tend to have a longer-lasting deodorizing effect than chemical deodorants. For these reasons, the cardboard of this embodiment can handle multiple odor components and efficiently deodorize odors that are mixtures of multiple odor components.

[0029] The odors that the cardboard of this embodiment can deodorize are not limited, but examples include urine odor, fecal odor, age-related odor, sweat odor, mold odor, sewage odor, and vomit odor. In particular, ammonia is one of the causative substances for typical urine odor. Also, hydrogen sulfide, methyl mercaptan, acetic acid, valeric acid, and trimethylamine are the causative substances for typical fecal odor. Of these, hydrogen sulfide, methyl mercaptan, acetic acid, and valeric acid are acidic, while ammonia and trimethylamine are alkaline.

[0030] Chemical deodorants and adsorbent deodorants are available in odorless or mildly odorous forms, and can deodorize without requiring a strong fragrance, such as modified fragrances used for sensory deodorization. Therefore, it is desirable that the cardboard in this embodiment be odorless or mildly odorous using such deodorants. This results in a highly versatile cardboard. Here, odorless or mildly odorous means that it does not contain fragrances intended for intentional scenting, such as fragrances for scenting or modified fragrances for sensory deodorization, and does not emit any fragrance. Chemical deodorants may contain odors characteristic of chemical substances, and the lingering scent of such odors is distinguished from the fragrance produced by fragrances.

[0031] The basis weight of the cardboard in this embodiment is not necessarily limited, but is 70 g / m². 2 ~1000g / m 2The basis weight should be selected according to the application. The basis weight of the cardboard is adjusted by the basis weight of the base paper and the coating layer. The basis weight is measured according to the basis weight measurement method of JIS P 8124 (1998). The paper thickness of the cardboard in this embodiment is not necessarily limited, but is between 75 μm and 1200 μm. The thickness should be selected according to the application. The paper thickness is the average value of five measurements taken using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho) under the conditions of JIS P 8111 (1998), after sufficient humidity control.

[0032] The base paper for the cardboard in this embodiment can be white cardboard, high-grade white cardboard, special white cardboard, white cardboard such as Manila cardboard, yellow cardboard, chipboard, colored cardboard, recycled paper-based corrugated cardboard liner, KP-based corrugated cardboard liner, etc. The base paper can be selected from known cardboards that do not have a deodorizing coating layer with the deodorizing agent according to this embodiment and do not have deodorizing function. The basis weight of the cardboard itself in this embodiment is not necessarily limited, but is 65 g / m². 2 ~995g / m 2 Therefore, you should select the basis weight according to the intended use.

[0033] The deodorizing mechanism of the chemical deodorant according to this embodiment is such that when malodorous components come into contact with the deodorant in the chemical deodorizing area, a chemical reaction occurs, transforming them into odorless components, thereby deodorizing them. Furthermore, if the deodorant is one that volatilizes from the chemical deodorizing area, when malodorous components come into contact with the volatilized deodorant, a chemical reaction occurs, transforming them into odorless components, thereby deodorizing them. The chemical deodorant can be applied to the base paper in liquid, gel, or other forms. The amount of chemical deodorant applied to the base paper can be appropriately adjusted according to the deodorizing effect and is not necessarily limited.

[0034] When applying a chemical deodorant to a base paper, a binder may be used. Alternatively, a penetration aid may be used to impregnate the base paper. The binder and penetration aid are not particularly limited, as long as they do not hinder the deodorant's effectiveness. For example, if the deodorant chemically neutralizes, decomposes, or captures odor components in the air, it is desirable to use a binder or penetration aid that does not excessively hinder the volatilization of the deodorant. Examples of such binders include starch, carboxymethylcellulose, polyvinyl alcohol, and styrene-acrylic copolymer. In applications where heat resistance needs to be considered during use, such as when using cardboard as a corrugated cardboard liner, it is desirable to use a resin binder with a glass transition temperature (Tg) of 30-70°C. Styrene-acrylic copolymer resin is particularly desirable as such a resin binder. Examples of penetration aids include diethylene glycol, monoethyl ether, isopropyl alcohol, and ethanol. Ethanol is particularly desirable.

[0035] Chemical deodorizers include acidic deodorizers and alkaline deodorizers. Acidic deodorizers are excellent at deodorizing odors derived from alkaline substances such as amines, which are representative of urine odor, while alkaline deodorizers are excellent at deodorizing odors derived from acidic substances such as sulfides, which are representative of fecal odor.

[0036] Specific examples of acidic deodorants include those containing at least one of polyphenols, polyphenol derivatives, and polyphenol analogs (hereinafter also referred to as "polyphenols, etc."), organic acids, and organic acid salts. Polyphenols, organic acids, and organic acid salts may be used individually or as a mixture of several of them. Polyphenols, etc. are extracted from plants and processed plant products, and due to their reactivity with phenolic hydroxyl groups, they are particularly effective at deodorizing ammonia, a representative odor component.

[0037] Specific examples of polyphenols include tannins, catechins, rutin, anthocyanins, ellagic acid, coumarin, flavones, and their derivatives or precursors. These exhibit a high deodorizing effect against ammonia, which is the cause of urine odor. Among the above specific examples, tannins and their derivatives are preferred. Tannins and tannin derivatives have a large molecular weight and many phenolic hydroxyl groups, so they have excellent deodorizing function. Tannins can be condensed tannins, hydrolyzed tannins, etc., and any of them is acceptable. In particular, among tannins, persimmon tannin and persimmon tannin derivatives derived from persimmons have a very large molecular weight and are extremely excellent in deodorizing effect, so it is preferable to include at least one of them as an acidic deodorant component according to the present invention. When persimmon tannin is included, tea catechin may also be included.

[0038] Specific examples of organic acids and organic acid salts are preferably those that are highly safe for the human body, and examples include carboxylic acids, sulfonic acids, or their inorganic or organic salts. Examples of inorganic bases that form salts include hydroxides, oxides, carbonates, and bicarbonates of alkali metals or alkaline earth metals such as sodium, potassium, lithium, calcium, and magnesium. Examples of organic bases include nitrogen-containing bases, such as primary, secondary, or tertiary amines, and compounds having groups such as imino groups, guanidino groups, imidazolino groups, imidazolyl groups, and pyridyl groups.

[0039] Particularly preferred organic acids and organic salts are carboxylic acids, inorganic salts and organic salts of carboxylic acids. A carboxylic acid is a compound having one or more carboxyl groups in its molecule. Examples of carboxylic acids include saturated fatty carboxylic acids, unsaturated fatty carboxylic acids, hydroxycarboxylic acids, and aromatic carboxylic acids. Hydroxycarboxylic acids having a hydroxyl group in their molecule are preferred. Among hydroxycarboxylic acids, citric acid or citrates are particularly preferred.

[0040] The deodorizing function of hydroxycarboxylic acid involves the carboxyl group reacting with the functional groups of alkaline odor components such as ammonia, neutralizing them and suppressing the odor. Furthermore, hydroxycarboxylic acid also functions as a chelating agent, binding to metal ions (e.g., iron ions and copper ions) that make up odor components, stabilizing them and suppressing the odor. In addition, hydroxycarboxylic acid becomes acidic when dissolved in water, lowering the pH value. For odor components that become more active in an alkaline environment, the creation of an acidic environment or neutralization by creating an alkaline environment suppresses the odor.

[0041] When using the above-mentioned polyphenols, organic acids, and organic acid salts as acidic deodorants, either individually or in combination of several of them, it is desirable to use at least one of diethylene glycol, monoethyl ether, and isopropyl alcohol as a penetration aid to improve penetration and coating properties into the base paper. Isopropyl alcohol is preferred.

[0042] The acidic deodorization region according to this embodiment is not necessarily limited, but the amount of acidic deodorant applied is preferably 0.01 to 10 g / m². 2 more preferably 0.5~5g / m 2 Particularly preferred is 0.8 to 2.0 g / m² 2 This range is particularly suitable when using the specific examples of acidic deodorants mentioned above. If the amount of acidic deodorant applied is within this range, it can effectively deodorize odors emitted from alkaline substances such as amines when placed in various spaces as a concrete product such as a box.

[0043] Examples of alkaline deodorants include components that exhibit alkalinity such as sodium hydroxide, sodium hypochlorite, and sodium bicarbonate. For example, as inorganic bases, hydroxides, oxides, carbonates, bicarbonates, etc. of alkali metals or alkaline earth metals can be mentioned. Also, as organic bases, compounds having groups such as nitrogen-containing bases, for example, primary, secondary or tertiary amines, imino groups, guanidino groups, imidazolinyl groups, imidazolyl groups, pyridyl groups, etc. can be mentioned. In particular, as an alkaline deodorant, it is desirable to have a pH of 7.0 to pH 10. This has little effect on corrosion of the production equipment during application.

[0044] The alkaline deodorant region according to this embodiment is not necessarily limited, but the amount of the alkaline deodorant applied is preferably 0.01 to 10 g / m 2 and more preferably 0.5 to 5 g / m 2 and particularly preferably 0.8 to 2.0 g / m 2 In particular, when using the specific examples of the alkaline deodorant mentioned above, this range is particularly suitable. If the amount of the alkaline deodorant applied is within the above range, malodorous components that are acidic substances can be effectively deodorized when placed in various spaces as specific products such as boxes.

[0045] When applying an acidic deodorant and an alkaline deodorant as chemical deodorants, the ratio of their contents is not necessarily limited, but the ratio of the content of the acidic deodorant to the content of the alkaline deodorant is preferably 4:1 to 1:4, and more preferably 3:1 to 1:3. By adjusting the ratio of the content of the acidic deodorant to the content of the alkaline deodorant within the above range, malodors in various spaces can be efficiently deodorized.

[0046] Here, there is a possibility that the deodorizing function of at least one of the deodorants may be reduced or lost due to the mutual contact between the acidic deodorant and the alkaline deodorant. However, in the paperboard according to this embodiment, as described later, by having a region where the acidic deodorant region and the alkaline deodorant region do not overlap with each other, the deodorizing functions of both can be exerted.

[0047] Next, the adsorption-type deodorant according to this embodiment will be described. The deodorizing mechanism of the adsorption-type deodorant is that when malodorous components come into contact with the deodorant in the adsorption-type deodorizing area, the malodorous components are fixed to the deodorant by an adsorption reaction, thereby deodorizing the agent. The adsorption action in the adsorption-type deodorant is a chemical and physical action, for example, by van der Waals forces, which adsorb malodorous components and odors onto the surface of the deodorant or into the pores present in the porous deodorant.

[0048] The malodorous components that adsorbent deodorants can eliminate are not limited to those eliminated by chemical deodorants. In addition to the acidic and alkaline malodorous components mentioned above, they can also eliminate odors present in various spaces, such as solvent odors from alcohol and fermentation odors from organic acids.

[0049] Specific examples of adsorbent deodorants include natural or synthetic zeolites such as chabazite, mordenite, erionite, hojasite, clinoptilolite, A-type zeolite, X-type zeolite, Y-type zeolite, L-type zeolite, and omega-type zeolite, as well as cristobalite, sepiolite, montmorillonite, xylotile, raffrinite, palygorskite, attapulgite, hydrotalcite, hydroxyapatite, silicon dioxide, aluminum oxide, silica alumina, zinc oxide, activated carbon, titanium dioxide, aluminum dioxide, aluminum hydroxide, betaine compounds, zirconium compounds, copper compounds, ion exchange resins, and composite compounds of silicates, aluminum salts, and zinc salts. These deodorants can provide sufficient deodorizing effects. Adsorbent deodorants may be in powder or granular form. Preferably, they contain silica alumina and amphoteric oxides among the above oxides. Composite compounds of silicates, aluminum salts, and zinc salts are also preferred. A composite compound of silicate, aluminum salt, and zinc salt has an adsorption surface area of ​​300 m² per gram. 2Furthermore, the particle surface has countless pores. Compared to activated carbon, it has a larger adsorption surface area, so it can adsorb and deodorize larger amounts of malodorous components such as hydrogen sulfide. In addition, the adsorbed hydrogen sulfide is oxidized and decomposed by the complexly bonded zinc peroxide (ZnO6) into zinc sulfide (ZnS) and water (H2O), so the deodorizing effect can be maintained for a longer period of time.

[0050] In the adsorbent deodorant of this embodiment, the most desirable average particle size for the powder is 20 μm or less. Preferably, it is 1 to 10 μm, and more preferably, 3 to 7 μm. With this average particle size, the specific surface area per unit volume of the adsorbent deodorant is sufficiently large, the time until breakthrough is long, and a large amount of odor can be deodorized. In particular, for the silicate, aluminum salt, and zinc salt composite compound, 2 to 5 μm is especially desirable. The particles are denser, and the adsorption area is larger. Note that the average particle size here is the value (D50) measured by the microtrac method.

[0051] When applying the adsorbent deodorant of this embodiment to the base paper, it is desirable to mix in a binder before applying it to the base paper so that it does not easily fall off. The binder is not particularly limited as long as it does not hinder the effect of the deodorant. For example, a binder that does not excessively block the opportunity for the adsorbent deodorant to come into contact with the outside air is used. Examples of such binders include acrylic binders such as styrene-acrylic copolymer, OP varnish, starch, carboxymethylcellulose, and polyvinyl alcohol. The preferred binder is an acrylic binder, and styrene-acrylic copolymer is particularly preferred. As described above, it has excellent heat resistance and abrasion resistance based on physical properties such as glass transition temperature, and processes for manufacturing products using cardboard, such as the lamination process when making corrugated cardboard boxes, can be carried out without problems.

[0052] The adsorption-type deodorizing region according to this embodiment is not necessarily limited, but the amount of adsorption-type deodorant applied is preferably 0.01 to 5.0 g / m². 2 , more preferably 0.05~2g / m 2 Particularly preferred is 0.1 to 1.0 g / m² 2This range is particularly suitable when using the specific examples of adsorbent deodorants mentioned above. If the amount of adsorbent deodorant applied is within this range, malodorous components can be effectively deodorized when the product, such as a box, is placed in various spaces.

[0053] The ratio of chemical deodorant to adsorbent deodorant in the cardboard 11 according to this embodiment is not particularly limited, but is preferably 4:1 to 1:4, more preferably 3:1 to 1:3. Chemical deodorants deodorize faster than adsorbent deodorants. This is due to the difference in their deodorizing mechanisms. Therefore, the above range of content ratios allows for a balanced effect between the deodorizing action of the chemical deodorant and the deodorizing action of the adsorbent deodorant, resulting in smooth deodorization. Adsorbent deodorants are often more expensive than chemical deodorants, particularly acidic and alkaline deodorants, which achieve their deodorizing effect through neutralization reactions. Given the nature of products using cardboard, low cost is especially important, so it is desirable to consider the cost of each deodorant when determining the content and ratio of adsorbent deodorant and chemical deodorant.

[0054] Next, the deodorizing region of the paperboard of this embodiment will be described. The paperboard of this embodiment has a chemically deodorizing region on at least one side of the paper substrate where a chemical deodorizer is applied, and an adsorption deodorizing region where an adsorption deodorizer is applied. The chemically deodorizing region in this embodiment is a region to which a chemical deodorizer that chemically deodorizes odors is applied. As shown in Figures 1 and 2, this chemically deodorizing region can be either an acidic deodorizing region using an acidic deodorizer or an alkaline deodorizing region using an alkaline deodorizer. Also, as shown in Figures 3 and 4, it can include both an acidic deodorizing region using an acidic deodorizer and an alkaline deodorizing region using an alkaline deodorizer. Furthermore, the adsorption deodorizing region in this embodiment is a region to which an adsorption type deodorizer is applied. Note that the paperboard according to this embodiment may have a non-deodorizing region on one side where no deodorizer is applied, but preferably, at least the entire surface of one side is in the form of a deodorizing region.

[0055] In this embodiment, a preferred arrangement of the deodorizing area in the cardboard is one in which the deodorizing area is located on only one side of the base paper. Since the deodorizer can be manufactured by coating one side of the base paper, it is easier to manufacture compared to the case where the deodorizing area is formed on both sides of the base paper. Furthermore, for example, when the cardboard is used as a liner for corrugated cardboard, adhesion to the core paper is required on one side, and this side is a part that is not exposed to the outside. Also, when a paper product with deodorizing function is made, one side is often used as an adhesive surface for assembly, etc., or one side is used as a patterned printing surface for design purposes. From the standpoint of ease of manufacture, adhesion, and design, having the deodorizing area on only one side is more versatile and therefore preferable.

[0056] In this embodiment, a preferred arrangement of the deodorizing areas in the cardboard is to provide an acidic deodorizing area with an acidic deodorizer and an adsorption deodorizing area with an adsorption deodorizer on one side of the base paper. This configuration is superior in terms of quantitative deodorizing effect, temporal deodorizing effect, and economic efficiency due to the synergistic effect of the deodorizing function by neutralization reaction of the acidic deodorizer and the deodorizing function by adsorption of the adsorption deodorizer, which are effective against a large number of malodorous components.

[0057] The thickness of each region, the chemical deodorizing region 20 (acidic deodorizing region 21, alkaline deodorizing region 22) and the adsorption deodorizing region, is not necessarily limited. The deodorizing region may be formed by providing the deodorizer in layers on the base paper, or the deodorizer may be impregnated into the base paper. A portion of the deodorizer may be formed in layers on the base paper, while the remainder is impregnated into the base paper. If the deodorizer is formed in layers, deodorization by the deodorizer proceeds relatively quickly, and a deodorizing effect can be easily obtained even for strong odors. On the other hand, if the deodorizer is impregnated into the base paper, deodorization by the deodorizer proceeds relatively gently, and a long-term deodorizing effect can be easily obtained. When the deodorizing region is applied to the base paper and formed in layers, the thickness of each region is not necessarily limited, but is preferably 0.01 to 2.0 μm, more preferably 0.7 to 1.7 μm. Within the above thickness range, the deodorizing effect can be sufficiently sustained.

[0058] In the paperboard according to this embodiment, the wider the chemical deodorizing area 20 and the adsorption deodorizing area 23, and the narrower the non-deodorizing area, the wider the contact area between the deodorant and the malodorous odor and the wider the area where the deodorant volatilizes, which enhances the deodorizing effect. Therefore, it is preferable that the area occupied by the portion where at least one of the chemical deodorizing area 20 and the adsorption deodorizing area 23 is present on one side of the paperboard according to this embodiment is 80% or more, more preferably 90% or more, and particularly preferable that it is 100%.

[0059] Furthermore, while the chemical deodorizing area 20 and the adsorption deodorizing area 23 may overlap, it is preferable to have a large area where they do not overlap in order for the chemical deodorizer and the adsorption deodorizer to fully exert their deodorizing function. For manufacturing purposes, the chemical deodorizing area 20 and the adsorption deodorizing area 23 may partially overlap, but if the chemical deodorizing area 20 overlaps the adsorption deodorizing area 23, the area on which the adsorption deodorizing area 23 can adsorb odors may decrease, or the contact area between the chemical deodorizer and the malodorous components may decrease. Therefore, it is desirable that they do not overlap as much as possible. Accordingly, the ratio of the area of ​​the overlapping region between the chemical deodorizing area 20 and the adsorption deodorizing area 23 to the area of ​​one side of the cardboard is preferably 50% or less, more preferably 25% or less, and particularly preferably 0%. In other words, it is particularly desirable that one side of the cardboard consists only of the chemical deodorizing area 20 and the adsorption deodorizing area 23, with no overlapping area.

[0060] Furthermore, it is desirable that the percentage of the area of ​​the chemical deodorizing region 20 that does not overlap with the adsorption deodorizing region 23 relative to the area of ​​one side of the cardboard be 50-80%. Also, it is desirable that the percentage of the area of ​​the adsorption deodorizing region 23 that does not overlap with the chemical deodorizing region 20 relative to the area of ​​one side of the cardboard be 20-50%. Due to differences in deodorization mechanisms, the deodorizing speed of chemical deodorizers and adsorption deodorizers differ. In addition, the target malodorous components are different. Within the above range, the deodorizing action of chemical deodorizers and the deodorizing action of adsorption deodorizers work in a balanced manner, resulting in smooth deodorization and superior deodorizing effect. In particular, if the chemical deodorizing region is limited to the acidic deodorizing region, it is desirable to use this range.

[0061] Furthermore, in the cardboard 10 according to this embodiment, if the chemical deodorizing region 20 includes an acidic deodorizing region and an alkaline deodorizing region, it is desirable that the overlapping area between the acidic deodorizer and the alkaline deodorizer be small, since they may neutralize each other and become inactive. Therefore, the ratio of the area of ​​the overlapping region between the acidic deodorizing region and the slightly alkaline region to the area of ​​the chemical deodorizing region is preferably 10% or less, more preferably 5% or less, and particularly preferably 0%. In other words, it is particularly desirable that the entire chemical deodorizing region consists only of the acidic deodorizing region and the alkaline deodorizing region, with no overlapping area.

[0062] Furthermore, it is desirable that the percentage of the area of ​​the acidic deodorizing area 21 that does not overlap with the alkaline deodorizing area 22 relative to the area of ​​the chemical deodorizing area be between 20% and 66%. Also, it is desirable that the percentage of the area of ​​the alkaline deodorizing area 22 that does not overlap with the acidic deodorizing area 21 relative to the area of ​​the chemical deodorizing area be between 33% and 80%.

[0063] Next, the arrangement of the chemical deodorizing region 20 and the adsorption deodorizing region 23 on one side of the paperboard is not particularly limited, but for example, as shown in Figure 1, one arrangement is one in which the chemical deodorizing region 20 and the adsorption deodorizing region 23 extend in the MD direction of the base paper, and the chemical deodorizing region 20 and the adsorption deodorizing region 23 are aligned in the CD direction of the base paper, preferably parallel to each other. In this arrangement shown in Figure 1, the ratio of the amount of chemical deodorizer to the adsorption deodorizer applied, and the area ratio of the chemical deodorizing region 20 and the adsorption deodorizing region 23 can be adjusted by adjusting the width of the chemical deodorizing region 20 and the adsorption deodorizing region 23 in the CD direction. In this embodiment, the MD direction of the paperboard is also called the longitudinal direction and is the flow direction during papermaking. The CD direction is also called the transverse direction and is perpendicular to the flow direction during papermaking.

[0064] Furthermore, when an acidic deodorant and an alkaline deodorant are used to form a chemical deodorizing region 20, and an acidic deodorant region 21 and an alkaline deodorant region 22 are provided, as shown in Figure 3, one configuration is one in which the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23 each extend in the MD direction, and the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23 are arranged side by side in the CD direction, preferably parallel to each other. To achieve this configuration, for example, in the configuration shown in Figure 3, the ratio of the amounts of acidic deodorant, alkaline deodorant and adsorption deodorant applied, as well as the relative area ratios of the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23, can be adjusted by adjusting the widths of the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23 in the CD direction.

[0065] Furthermore, as shown in Figure 5, one possible arrangement of the chemical deodorizing areas 20 and adsorption deodorizing areas 23 is one in which multiple chemical deodorizing areas 20 are intermittently provided at intervals in the MD direction, and the adsorption deodorizing areas 23 are provided to fill the gaps in the areas where the chemical deodorizing areas 20 are not provided. In this arrangement, the ratio of the amount of chemical deodorizer to the adsorption deodorizer applied, as well as the area ratio of the chemical deodorizing areas 20 and the adsorption deodorizing areas 23, can be adjusted by adjusting the width of the chemical deodorizing areas 20 and the adsorption deodorizing areas 23 in the MD direction.

[0066] Furthermore, when an acidic deodorant and an alkaline deodorant are used to form a chemical deodorizing region 20, and an acidic deodorant region 21 and an alkaline deodorant region 22 are provided, one possible arrangement is shown in Figure 6, in which the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23 are repeatedly arranged in the MD direction with a predetermined width. In this arrangement, the ratio of the amounts of acidic deodorant, alkaline deodorant and adsorption deodorant applied, as well as the area ratio of the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23, can be adjusted by adjusting the width of the acidic deodorant region 21, the alkaline deodorant region 22, and the adsorption deodorant region 23 in the MD direction.

[0067] The arrangement of the deodorizing areas is not limited to the arrangement described above. Each area 20, 23 can be formed and arranged in an appropriate shape or pattern, such as linear, dotted, circular, or block-like.

[0068] On the other hand, it is desirable that the dynamic friction coefficient of the surface having the chemical deodorizing region and the adsorption deodorizing region of the cardboard of this embodiment be 0.15 or more and 0.25 or less. In particular, it is desirable that the dynamic friction coefficient of the deodorizing region formed by coating the base paper with a deodorizer using a binder be 0.15 or more and 0.25 or less. This makes it difficult for the deodorizer constituting the deodorizing region to detach from the base paper. For this reason, in particular, when the adsorption deodorizing region is a region formed by applying an adsorption-type deodorizer such as powder to the base paper using a binder, it is desirable that the dynamic friction coefficient of the adsorption deodorizing region be 0.15 or more and 0.25 or less. The friction coefficient here is the value measured in the MD direction of the cardboard according to JIS P8147 (2010) "Paper and cardboard - Method for measuring static and dynamic friction coefficients". A kinetic friction coefficient of 0.15 to 0.25 is desirable, as it affects friction during manufacturing and processing, as well as abrasion resistance when manufacturing corrugated cardboard as a liner for corrugated cardboard, and release properties in the corrugator.

[0069] Next, an example of a method for manufacturing the cardboard of this embodiment will be described. The cardboard of this embodiment can be manufactured, for example, as shown in Figure 7, by unwinding the base paper 32W from a roll 32a' on which the base paper 32W without a deodorant coating is wound, applying a chemical deodorant and an adsorbent deodorant using a printing press 61 or the like, and then winding it up again. As shown in the figure, the cardboard may be slit along the MD direction by a slitter 63 before being wound up again, and wound up as multiple rolls of cardboard narrower than the base roll. Furthermore, although the illustrated form shows cardboard 32A in roll form, it may also be cut in the CD direction without winding to produce sheet cardboard.

[0070] In the manufacturing of the cardboard of this embodiment, the deodorizer can be applied to the base paper by coating, for example, using a coating machine or printing machine. The coating machine or printing machine can be appropriately selected from known coating machines and printing machines such as rod coaters, flexographic coaters, gravure coaters, spray coating devices, inkjet printers, offset printers, flexographic printers, and gravure printers. In particular, the use of a printing machine is preferable. A printing machine, using multi-color printing technology with multiple printing plates, makes it easy to freely arrange and apply deodorizers with different properties to the paper surface, allowing for a high degree of freedom in arranging the deodorizing areas according to this embodiment. For example, offset printers, center-drum type gravure printers, and flexographic printers are preferred. These printing machines, in particular, allow for easy adjustment of the width of each deodorizing area in the MD direction and CD direction of the base paper, as well as the degree of overlap between the deodorizing areas. As shown in Figure 7, drying means 62 such as a heater, heat roll, or hot air dryer may be provided downstream of the printing press 61 to dry the deodorant quickly. Multiple drying means may be provided.

[0071] Furthermore, if applying the deodorizer using a flexographic printing or coating machine, the screen ruling for the anilox roll should ideally be 165-200 lines / inch. When using a gravure printing or coating machine, a screen ruling of 100-400 lines / inch is preferable. With these screen rulings, the deodorizer can be applied uniformly and evenly. While a 100% coverage (solid printing) is desirable, it is also possible to increase the screen ruling and decrease the coverage, and this can be combined with the print design to enhance aesthetics.

[0072] The order in which chemical deodorants and adsorbent deodorants are applied is not limited. Even when acidic and alkaline deodorants are applied as chemical deodorants, the order in which the acidic, alkaline, and adsorbent deodorants are applied is not limited. Furthermore, the number of coating and printing machines is not limited to one; multiple machines may be used per deodorant sheet.

[0073] When applying a deodorant to base paper 32W that has not been treated with a deodorant, a solvent, binder, and penetration aid can be used to make it suitable for coating and other applications. As mentioned above, when applying an adsorbent type deodorant, it is desirable to use a binder from the viewpoint of stability, improved coating properties in printing presses, etc., and stability during post-coating processing (prevention of peeling of the coated surface). Furthermore, when applying an acidic deodorant in particular, it is desirable to use a penetration aid from the viewpoint of stability and improved coating properties in printing presses, etc.

[0074] When applying an adsorbent deodorant to a base paper and using a binder, the preferred mixing ratio (adsorbent deodorant:binder) is 70:30 to 30:70. This mixing ratio is particularly preferred for acrylic binders. A more preferred mixing ratio of adsorbent deodorant to binder is 65:35 to 35:65, and particularly preferred is 60:40 to 40:60.

[0075] The amount of coating solution containing the deodorant applied can be appropriately adjusted considering the type of deodorant, deodorizing effect, properties of the coating solution, drying time, etc. If the deodorant is selected from the previously described acidic deodorants such as polyphenols, organic acids, and organic acid salts, a preferred coating amount in one embodiment is when the deodorant content is 0.1 to 10.0 g / m². 2 Adjust the amount to achieve the following. If selected from the alkaline deodorants described above, a preferred coating amount in one embodiment is 0.01 to 10.0 g / m². 2 Adjust accordingly. If selected from the adsorbent deodorants described above, a preferred coating amount in one embodiment is 0.01 to 5.0 g / m². 2 Adjust it so that it becomes like this.

[0076] Here, as a coating method for the base paper 32W, for example, a chemical deodorant is continuously or intermittently coated in multiple rows extending in the MD direction at predetermined intervals in the CD direction and with different widths, and then an adsorbent deodorant is continuously or intermittently coated in each of the aforementioned gaps extending in the MD direction. Through this coating, a cardboard 32X is formed in which chemical deodorant regions 20 and adsorbent deodorant regions 23 extending in the MD direction and adsorbent deodorant regions 23 are arranged alternately in the CD direction with different widths, as shown in Figure 8.

[0077] Then, by continuously cutting along the MD direction with a cutter at the positions of cutting lines y1-y1 to y2-y2, for example as shown in Figure 8, so that the chemical deodorizing region 20 and the adsorption deodorizing region 23 of the cardboard 32X are included in one row each, multiple cardboards with different arrangements of the chemical deodorizing region 20 and the adsorption deodorizing region 23 can be obtained. [Examples]

[0078] Deodorizing effect tests were conducted on samples of the cardboard according to this embodiment (Examples 1-8) and samples of other cardboard (Comparative Examples 1-4). Furthermore, abrasion resistance tests for deodorizer shedding were performed on Examples 1-4, Example 8, and Comparative Example 4. The size of the cardboard used was 60mm x 210mm. The base paper for each sample, before the application of the deodorizer, was "JEK 120g / m²" manufactured by Daio Paper Corporation. 2 They used "".

[0079] The abrasion resistance test was conducted in accordance with JIS-P8136 (1994) "Test Method for Abrasion Resistance of Paperboard." Under a load of 500g, the surface of the paperboard with the deodorant applied and the surface without the deodorant were slid 20 times, and the mass of fibers and other materials detached from the paperboard surface was measured. A value of less than 0.1g was evaluated as ○, and a value of 0.1g or more was evaluated as ×.

[0080] The cardboard according to Example 1 has an acidic deodorizing region on one side and an adsorption deodorizing region on the other side, both treated with an acidic deodorizer. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and is applied at a rate of 1.1 g / m². 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder was 50:50 by mass, and the application rate was 0.6 g / m². 2 (Adsorbent deodorant 0.3g / m²) 2 Binder 0.3g / m 2 The acidic deodorizing area and the adsorption deodorizing area do not overlap. The area ratio of the acidic deodorizing area to the adsorption deodorizing area is 50%:50%. The coefficient of dynamic friction was measured to be 0.15.

[0081] The cardboard according to Example 2 has an acidic deodorizing region coated with an acidic deodorizer and an adsorption deodorizing region coated with an adsorption type deodorizer formed on one side. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and the coating amount is 1.4 g / m² in terms of solid content. 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder was 50:50 by mass, and the application rate was 0.4 g / m². 2 (Adsorbent deodorant 0.2g / m²) 2 Binder 0.2g / m 2 The acidic deodorizing area and the adsorption deodorizing area do not overlap. The area ratio of the acidic deodorizing area to the adsorption deodorizing area is 67%:33%. The coefficient of dynamic friction was measured to be 0.20.

[0082] The cardboard according to Example 3 has an acidic deodorizing region on one side and an adsorption deodorizing region on the other side, both of which are treated with an acidic deodorizer. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and is applied at a rate of 1.6 g / m². 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder is 50:50 by mass. The application rate is 0.3 g / m². 2 (Adsorbent deodorant 0.15g / m²) 2 Binder 0.15g / m 2 The acidic deodorizing area and the adsorption deodorizing area do not overlap. The area ratio of the acidic deodorizing area to the adsorption deodorizing area is 75%:25%.

[0083] The cardboard according to Example 4 has an acidic deodorizing region on one side and an adsorption deodorizing region on the other side, both of which are treated with an acidic deodorizer. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and is applied at a rate of 1.7 g / m². 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder is 50:50 by mass. The application rate is 0.3 g / m². 2 (Adsorbent deodorant 0.15g / m²) 2 Binder 0.15g / m 2 The acidic deodorizing area and the adsorption deodorizing area do not overlap. The area ratio of the acidic deodorizing area to the adsorption deodorizing area is 80%:20%.

[0084] The cardboard according to Example 5 has an alkaline deodorizing region on one side and an adsorption deodorizing region on the other side, both treated with an alkaline deodorizer. The alkaline deodorizer contains sodium hydroxide and polyamine polycarboxylic acid, has a pH of 8.5 to 9.5, and is applied at a rate of 1.1 g / m². 2The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder is 50:50 by mass. The application rate is 0.6 g / m². 2 (Adsorbent deodorant 0.3g / m²) 2 Binder 0.3g / m 2 The alkaline deodorizing area and the adsorption deodorizing area do not overlap. The area ratio of the alkaline deodorizing area to the adsorption deodorizing area is 50%:50%.

[0085] The cardboard according to Example 6 has an acidic deodorizing region on one side, an alkaline deodorizing region on one side, an alkaline deodorizing region on one side, and an adsorption deodorizing region on one side, on the other side, an adsorption deodorizing region on one side, an adsorption type deodorizing region. The acidic deodorizing agent mainly consists of citric acid, has a pH of 4.0 to 5.0, and a coating amount of 1.2 g / m². 2 The alkaline deodorant contains sodium hydroxide and polyamine polycarboxylic acid, has a pH of 8.5-9.5, and a coating amount of 1.2 g / m². 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder is 50:50 by mass. The application rate is 0.6 g / m². 2 (Adsorbent deodorant 0.3g / m²) 2 Binder 0.3g / m 2 ). Note that the acidic deodorization area, alkaline deodorization area, and adsorption deodorization area do not overlap. The area ratio of the acidic deodorization area, alkaline deodorization area, and adsorption deodorization area is 33.3%:33.3%:33.3%.

[0086] The cardboard according to Example 7 has an acidic deodorizing region on one side and an adsorption deodorizing region on the other side, both treated with an acidic deodorizer. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and is applied at a rate of 2.1 g / m². 2The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder was 50:50 by mass, and the application rate was 1.3 g / m². 2 (Adsorbent deodorant 0.65g / m²) 2 Binder 0.65g / m 2 ). Note that the acidic deodorizing area and the adsorption deodorizing area overlap throughout the entire area. The order of application was to apply the acidic deodorizer first. The area ratio of the acidic deodorizing area to the adsorption deodorizing area is 100%:100%.

[0087] The cardboard according to Example 8 has a second deodorizing region on its inner surface, to which an alkaline deodorizer is applied, and an adsorption deodorizing region to which an adsorption-type deodorizer B is applied. The alkaline deodorizer contains sodium hydroxide and polyamine polycarboxylic acid, has a pH of 8.5 to 9.5, and is applied in an amount of 0.6 g / m². 2 The adsorbent deodorant is primarily composed of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. A styrene-acrylic copolymer binder was used as the binder for coating. The ratio of the adsorbent deodorant to the binder was 50:50 by mass, and the application rate was 1.3 g / m². 2 (Adsorbent deodorant 0.65g / m²) 2 Binder 0.65g / m 2 ). Note that the alkaline deodorizing area and the adsorption deodorizing area overlap throughout the entire area. The order of application was to apply the alkaline deodorizer first. The area ratio of the alkaline deodorizing area to the adsorption deodorizing area is 100%:100%.

[0088] The cardboard in Comparative Example 1 has an acidic deodorizing region formed only on one side by applying an acidic deodorizer. The acidic deodorizer mainly consists of citric acid, has a pH of 4.0 to 5.0, and is applied at a rate of 2.1 g / m². 2 The area ratio of the acid-deodorizing region on one side is 100%.

[0089] The cardboard in Comparative Example 2 has an alkaline deodorant applied to one side, forming only an alkaline deodorant area. The alkaline deodorant contains sodium hydroxide and polyamine polycarboxylic acid, has a pH of 8.5 to 9.5, and is applied at a rate of 0.6 g / m². 2 The area percentage of the alkaline deodorizing region on one side is 100%.

[0090] The cardboard in Comparative Example 3 has an adsorption-type deodorizing area formed on one side by applying an adsorption-type deodorizer. The amount applied is 0.6 g / m². 2 The adsorbent deodorant primarily consists of a porous composite compound of silicate, aluminum salt, and zinc salt, operating at a pH of 6.5 to 10.5. It was coated using a styrene-acrylic copolymer binder. The application rate was 1.3 g / m². 2 (Adsorbent deodorant 0.65g / m²) 2 Binder 0.65g / m 2 The area ratio of the adsorption and deodorization region on one side is 100%.

[0091] The cardboard used in Comparative Example 4 is a blank sample without any deodorant applied. The coefficient of dynamic friction was measured to be 0.34.

[0092] Furthermore, it has been confirmed that mixing the acidic and alkaline deodorizers used results in a neutralization reaction, leading to a decrease in their deodorizing effect.

[0093] The test procedure is described below. The tests were conducted in a constant temperature room maintained at 23°C and 55% relative humidity. For each example, the cardboard was placed in an airtight bag (a 5L Tedlar bag manufactured by AS ONE Corporation), and gaseous ammonia and hydrogen sulfide were injected into the bag as odors. The initial concentration of ammonia in the bag was adjusted to 260 ppm and the initial concentration of hydrogen sulfide to 4.4 ppm, the bag was sealed, and left to stand. Note that gaseous ammonia and hydrogen sulfide were tested separately in different bags.

[0094] The concentration of odors inside the bag was measured using a gas detection tube (a product of Gastec Co., Ltd.) 10 minutes and 2 hours after standing. The deodorization rate of each odor was calculated from the measurement results using the following formula 1. (Deodorization rate (%)) = [(Initial odor concentration (ppm)) - (Odor concentration after 10 minutes or after 2 hours (ppm))] / (Initial odor concentration (ppm)) × 100 ... Formula 1 Furthermore, the detection limit for hydrogen sulfide is 88.6%.

[0095] The results are shown in Table 1.

[0096] [Table 1]

[0097] Comparing Comparative Example 1, which used only an acidic deodorant, with Comparative Example 4, which was a blank sample, Comparative Example 1, which used only an acidic deodorant, was hardly able to deodorize hydrogen sulfide. Similarly, comparing Comparative Example 2, which used only an alkaline deodorant, with Comparative Example 4, which was a blank sample, Comparative Example 2, which used only an alkaline deodorant, was hardly able to deodorize ammonia. In contrast, Examples 1 to 8 of the present invention showed effective results against each odor component of ammonia and hydrogen sulfide. Furthermore, the results were superior to Comparative Example 3, which used only an adsorption-type deodorant. It was confirmed that a high deodorizing effect can be achieved by using a combination of a chemical deodorant and an adsorption-type deodorant.

[0098] Furthermore, comparing Examples 1-6 with Examples 7 and 8, it was found that the effect of the non-overlapping deodorizing areas was greater than that of the amount of deodorizer applied, confirming that it is useful to ensure that the deodorizing areas do not overlap. Moreover, based on Examples 1, 5, and 6, it is considered that when providing acidic and alkaline deodorizing areas as chemical deodorizing areas, it is more effective to make the alkaline deodorizing area larger than the area of ​​the acidic deodorizing area. In Comparative Example 1, the hydrogen sulfide deodorization rate tended to increase slightly over time, and in Comparative Example 2, the ammonia deodorization rate tended to increase slightly over time. However, compared to Comparative Example 4, which was a blank sample, this is considered to be due to the temporary absorption of ammonia and hydrogen sulfide by the paper itself, and not due to the deodorizing effect of the deodorizer in a state where re-release is possible.

[0099] Furthermore, comparing Examples 1-4 and Example 8 with Comparative Example 4, which served as a blank sample, the coating of the deodorant reduced the coefficient of dynamic friction, resulting in a surface that is less prone to shedding of fibers and other materials. In the case of adsorbent deodorants, this is thought to be due to the effect of the binder. [Explanation of symbols]

[0100] 11...Cardboard, 20...Chemical deodorization area, 21...Acid deodorization area, 22...Alkaline deodorization area, 23...Adsorption deodorization area, 32a'...Base roll, 32W...Base paper (substrate paper), 32X, 32A...Rolled cardboard, 61...Printing press, 62...Dryer, 63...Slitter.

Claims

1. On at least one surface of the paper substrate, A chemical deodorizing area is provided with a chemical deodorizer that chemically eliminates odors, It has an adsorption deodorizing region to which an adsorption deodorizing agent is applied to deodorize odors by adsorption, The chemical deodorizing region and the adsorption deodorizing region have regions that do not overlap with each other. A type of cardboard characterized by the following features.

2. The ratio of the area of ​​the region where the chemical deodorizing region and the adsorption deodorizing region do not overlap with the area of ​​the aforementioned one surface is 80% or more. The cardboard according to claim 1.

3. The aforementioned chemical deodorization area is The cardboard according to claim 1 or 2, wherein it is an acidic deodorizing region to which an acidic deodorizing agent has been applied, or an alkaline deodorizing region to which an alkaline deodorizing agent has been applied.

4. The aforementioned chemical deodorization area is Acidic deodorizing area with added acidic deodorizer, It has an alkaline deodorizing region to which an alkaline deodorizing agent is applied, The acidic deodorizing region and the alkaline deodorizing region have regions that do not overlap with each other. The cardboard according to claim 1 or 2, wherein the ratio of the area of ​​the region in which the chemical deodorizing region and the adsorption deodorizing region do not overlap with each other to the area of ​​the chemical deodorizing region is 80% or more.

5. The paperboard according to claim 1, wherein the adsorption and deodorizing region is formed by a coating layer containing inorganic particles and a styrene-acrylic copolymer binder.

6. The cardboard according to claim 3 or 4, wherein the acidic deodorant comprises at least one of an organic acid and an organic salt.

7. The alkaline deodorant comprises sodium hydroxide and polyamine polycarboxylic acid, as described in claim 3 or 4.

8. The cardboard according to claim 1, wherein the static friction coefficient of the surface having the chemical deodorizing region and the adsorption deodorizing region is 0.15 or more and 0.25 or less.

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