TWI614381B - Sheet containing metal oxides and/or metal hydroxides - Google Patents

Description

Sheet containing metal oxides and/or metal hydroxides

The present invention relates to sheets containing metal oxides and/or metal hydroxides, particularly to non-woven fabrics containing calcium oxide and/or calcium hydroxide. The sheet containing the metal oxide and/or the metal hydroxide of the present invention is used as a wet type for wetness, and can be used as a wiping sheet for cleaning and toilet cleaning; Wipe sheets for anti-virus purposes; and wiping sheets for prevention of infection in hospitals, kindergartens, nurseries, public facilities, sports gyms, etc.; wiping sheets and wet towels after vomiting and diarrhea treatment. Moreover, it can be used for a dry use which is used in a dry state without a water content, and can be used for food tray mats, food packaging sheets, cosmetic sheets, antibacterial sheets, insect repellent sheets, masks, cleaning sheets, and the like. use. Further, it can be used as a desiccant, a dry ‧ mold-proof sheet, a deodorant ‧ an anti-fungal sheet, or a use as a package (package) food, a package with a food, or a food store together

Metal oxides such as calcium oxide (CaO) and magnesium oxide (MgO), or metal hydroxides such as calcium hydroxide (Ca(OH) ₂ ) and magnesium hydroxide (Mg(OH) ₂ ) are known. The antibacterial activity can inhibit the sterilization or proliferation of microorganisms. Therefore, these metal oxides and metal hydroxides are used in the field of antibacterial processed products, foods (sterilization, disinfection, anti-oxidation of foods, preservation of foods), aquatic products (preservation of fresh fish), and agricultural fields ( Soil improvement, livestock related), cosmetics, bath products, sanitary products, medical components, cleaning supplies, clothing (deodorization), miscellaneous goods and other fields.

For example, Patent Document 1 discloses an antibacterial nanofiber nonwoven fabric which can be used as a sanitary material for sanitary products such as diapers, sanitary napkins, and rags, and which uses calcium oxide powder as an antibacterial agent. Patent Document 1 discloses an antibacterial nanofiber nonwoven fabric produced by a production method including the following steps: a step of dissolving calcium oxide powder in purified water to obtain a calcium saturated aqueous solution having a pH of 12.0 to pH 14.0; A step of impregnating the surface of the nanofiber nonwoven fabric with calcium impregnated with a nanofiber impregnated aqueous solution; and a step of drying the nanofiber impregnated calcium impregnated nonwoven fabric.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-246595

Although the antibacterial mechanism of metal oxides and metal hydroxides is not completely clear, it is generally considered that the main reason is that metal oxides or metal hydroxides are alkaline when dissolved in water. Further, there is also a description that the metal ions are bonded to the -SH group in the protein present in the cell matrix of bacteria or mold, and the cells are prevented from breathing, thereby sterilizing. In addition, it is also presumed that the hydroxyl radical (OH‧) or the hydroxyl ion (OH ^- ) in the aqueous solution decomposes the organic substance by its oxidation, thereby achieving an antibacterial effect.

However, in Patent Document 1, as described above, an antibacterial nanofiber nonwoven fabric is obtained by first dissolving calcium oxide in water in the production step to form a calcium saturated aqueous solution, and then immersing the nanofiber nonwoven fabric therein. In the case of this production method, calcium oxide (CaO) (metal oxide) as a raw material is mostly used in an antibacterial nanofiber nonwoven fabric in a water-containing state before drying, and is considered to be calcium hydroxide (Ca(OH) ₂ ). (Metal hydroxide) is contained in the form. The above Ca(OH) ₂ is considered to be free of Ca ²⁺ and OH‧ or OH ^- in water. Therefore, it is considered that in the step of drying the antibacterial nanofiber nonwoven fabric in a hydrated state, CO ₂ in the atmosphere selectively reacts with Ca ²⁺ to obtain CaCO ₃ (metal carbonate) having no antibacterial property. As a result, the inventors found that the produced antibacterial nanofiber nonwoven fabric could not obtain the desired high antibacterial property.

An object of the present invention is to provide a metal oxide-containing and/or metal hydroxide-containing sheet excellent in antibacterial properties.

The present invention for solving the above problems has the following aspects.

[1] A non-woven fabric comprising a nonwoven fabric having a layer containing a metal component, wherein the metal component is present in the form of a metal oxide and/or a metal hydroxide.

[2] The nonwoven fabric according to [1], wherein the layer contains fibers, and the powder of the metal oxide and/or metal hydroxide is held in a void formed by the fibers.

[3] The nonwoven fabric according to [1] or [2], wherein the layer contains a heat-fusible resin A; and the powder of the metal oxide and/or metal hydroxide present in the layer is A part of the powder is fixed in a state of being covered with the heat-fusible resin A.

[4] The nonwoven fabric according to any one of [1], wherein the layer adjacent to the layer contains a heat-fusible resin B; and the metal oxide and/or metal hydrogen present in the layer The powder of the oxide is fixed in a state in which a part of the powder is covered with the heat-fusible resin B.

[5] The non-woven fabric according to any one of [1] to [4], which is subjected to heat sealing processing.

[6] The nonwoven fabric according to any one of [1] to [5] wherein an adhesive layer is provided adjacent to the layer.

[7] The non-woven fabric according to any one of [1] to [6], which is subjected to embossing.

The non-woven fabric according to any one of the above-mentioned, wherein the metal oxide and/or metal hydroxide is one or more of MO and/or M(OH) ₂ (described above). M is a metal oxide and/or a metal hydroxide represented by Mg, Ca, Sr or Ba).

[9] The non-woven fabric according to any one of [1] to [8] wherein the metal oxide and/or metal hydroxide is calcium oxide and/or calcium hydroxide.

The nonwoven fabric of the present invention has a layer containing a metal component, and the metal component is present in the form of a metal oxide and/or a metal hydroxide.

In the present invention, the metal component is present in the layer in the form of a metal oxide and/or a metal hydroxide. In the nonwoven fabric of the present invention, the metal oxide and/or the metal hydroxide can function as an antibacterial agent, and as a result, the nonwoven fabric of the present invention can have excellent antibacterial properties.

Further, the nonwoven fabric of the present invention may contain a metal oxide and/or a metal hydroxide depending on the powder form. Since the metal oxide and/or the metal hydroxide in the form of powder can maintain the form when it is initially added to the layer, the metal oxide can be easily made in any part of the in-plane direction and the thickness direction of the layer. / or metal hydroxide localization.

The present invention is provided with a nonwoven fabric having a layer in which a metal component is in the form of a metal oxide and/or a metal hydroxide, and can be produced, for example, by a dry production method (dry method) which does not pass through water. The reason for this is that according to the dry production method, the metal oxide and/or the metal hydroxide used as the raw material does not become calcium carbonate (Ca(CO ₃ ), and can maintain oxides and/or hydroxides in the nonwoven fabric manufacturing step. The state of the object is covered in the layer.

When the layer containing the metal component is provided by a dry method, since the metal oxide and/or the metal hydroxide can be contained in the sheet without being dissolved, the metal oxide and/or the metal hydroxide can be efficiently used. Configured in the layer.

1‧‧‧Fiber web forming device

10‧‧‧Transporter

11‧‧‧ Roll

20‧‧‧ breathable endless belt

30‧‧‧Fiber mesh raw material supply means

40‧‧‧1st slide supply means

41‧‧‧1st slide

50‧‧‧Second slide supply means

51‧‧‧2nd slide

60‧‧‧sucker box

100‧‧‧Metal (hydrogen) oxide layer

110‧‧‧Fiber-containing metal (hydrogen) oxide layer

120‧‧‧Metal (hydrogen)-containing oxide layer containing heat-fusible resin A

200‧‧‧layer containing heat-fusible resin B

300‧‧‧Other layers

500‧‧‧Next layer

A‧‧‧Hot fusion resin

B‧‧‧Hot fusion resin

D‧‧‧metal (hydrogen) oxide

F‧‧‧Fiber

W‧‧‧Airlaid web

Fig. 1 (a) to (i) are views showing a configuration example of a metal oxide-containing and/or metal hydroxide-containing sheet of the present invention.

Fig. 2 is a schematic view showing a web forming apparatus which can be used in the method for producing a metal oxide-containing and/or metal hydroxide-containing sheet of the present invention.

Fig. 3 is a cross-sectional SEM photograph (magnification of 500 times) of a sheet containing a metal oxide and/or a metal hydroxide of the present invention.

Fig. 4 is a table showing the results of performance evaluation tests for the examples and the comparative examples.

Fig. 5 is a table showing the results of performance evaluation tests for the examples and the comparative examples.

Fig. 6 is a table showing the results of performance evaluation tests for the examples and the comparative examples.

Fig. 7 is a table showing the results of performance evaluation tests of Examples and Comparative Examples.

Fig. 8 is a table showing the results of performance evaluation tests of Examples and Comparative Examples.

(Shelds containing metal oxides and/or metal hydroxides (non-woven fabric))

The metal oxide-containing and/or metal hydroxide-containing sheet of the present invention is provided with a nonwoven fabric having a metal component-containing layer, wherein the metal component is present in the form of a metal oxide and/or a metal hydroxide.

Here, the above-mentioned "sheet" can also be expressed as "non-woven fabric". That is, the sheet of the present invention may be a metal-containing oxide and/or a metal hydroxide-containing layer, and the metal-containing oxide and/or metal hydroxide-containing layer may be provided by a dry method. A sheet of oxide and/or metal hydroxide.

In this case, the so-called "layer containing metal oxides and/or metal hydroxides" is equivalent. In the above-mentioned "metal-containing layer", the metal of the metal component is in contact with water to form a metal which is a metal oxide or a metal hydroxide of a strong base, preferably a divalent metal, and more preferably a periodic table. A metal of a Group 2 element, a metal of a particularly preferred system M (M-type Mg, Ca, Sr or Ba), and an alkali-based metal.

Hereinafter, in the present specification, "metal oxide and/or metal hydroxide" is also referred to as "metal (hydrogen) oxide". Further, the "metal-containing layer" is also referred to as "metal oxide-containing and/or metal hydroxide-containing layer" or "metal-containing (hydrogen) oxide layer". Further, the nonwoven fabric of the present invention is also referred to as a metal oxide-containing and/or metal hydroxide-containing sheet, a metal-containing (hydrogen) oxide nonwoven fabric or a metal-containing (hydrogen) oxide sheet.

The structure of the metal-containing (hydrogen) oxide sheet included in the scope of the present invention will be described with reference to Fig. 1 . BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the constitution of a metal-containing (hydrogen) oxide-containing sheet of the present invention by way of illustration and not limitation. In the drawings, the same component symbols denote the same constituent elements. The case where the same constituent elements are omitted will be omitted.

1(a) to (c) show a metal-containing (hydrogen) oxide sheet containing the metal (hydrogen) oxide layer 100 of the present invention. Fig. 1(a) is a metal-containing (hydrogen) oxide sheet composed only of a metal-containing (hydrogen) oxide layer 100. 1(b) and (c) are metal-containing (hydrogen) oxide sheets in which other layers 300 are laminated on one or both sides of the metal-containing (hydrogen) oxide layer 100.

The metal-containing (hydrogen) oxide sheet of the present invention may have a single layer structure or may have two or three layers or a multilayer structure of four or more layers (not shown). The metal-containing (hydrogen) oxide sheet may also contain two or more metal-containing (hydrogen) oxide layers 100. Other layer 300 The metal-containing (hydrogen) oxide sheet can be imparted for the purpose of, for example, modifying the surface of the metal-containing (hydrogen) oxide sheet or imparting strength (rigidity) to the metal-containing (hydrogen) oxide sheet. For some functional purposes, etc. The other layer 300 may be a sheet such as cloth, non-woven fabric, paper, or film. The other layer 300 may also contain a heat-fusible resin. When the metal-containing (hydrogen) oxide sheet has a plurality of layers 300, the layers 300 may be the same material or different materials.

The metal (hydrogen) oxide layer 100 may contain only metal (hydrogen) oxide D. In this case, it is not limited to a single type, and may contain a plurality of types of metal (hydrogen) oxide D. The type of metal (hydrogen) oxide will be described later.

Further, the metal-containing (hydrogen) oxide layer 100 may contain, in addition to the metal (hydrogen) oxide D, fibers, a heat-fusible resin, an effect promoter, and the like.

In order to prevent the metal (hydrogen) oxide D from falling off from the metal-containing (hydrogen) oxide sheet, a specific embodiment shown in the following first to sixth aspects will be described.

(1st aspect)

Fig. 1(d) shows an example in which the metal-containing (hydrogen) oxide layer 100 contains the fiber F. In the metal-containing (hydrogen) oxide layer 110 containing the fiber F, the powder of the metal (hydrogen) oxide is held in the void formed by the fiber F, that is, the void in the fiber structure composed of the fiber F. This prevents powder from falling out.

In the fiber-containing metal-containing (hydrogen) oxide layer 110, only metal (hydrogen) oxide D and fiber F may be contained. Further, in the fiber-containing metal-containing (hydrogen) oxide layer 110, in addition to the metal (hydrogen) oxide D and the fiber F, a heat-fusible resin, an effect accelerator, or the like may be contained. Further, the fiber F may be a heat-fusible resin.

In this aspect, the metal-containing (hydrogen) oxide sheet may have a metal (hydrogen) oxide layer 110 containing the fiber F for the purpose of imparting functionality such as surface modification or imparting strength (rigidity). A multilayer structure (not shown) of the other layers 300 is laminated on one side or both sides.

Here, FIG. 3 is a view showing an example of a "fiber-containing metal-containing (hydrogen) oxide layer" in a metal-containing (hydrogen) oxide sheet according to a first aspect of the present invention, which is obtained by a scanning electron microscope (SEM). Cross-sectional photo (magnification 500 times). From this photograph, it is understood that in the CaO-containing layer, CaO is fixed by a heat-fusible resin (heat-fusible fiber). Accordingly, in the present invention, the metal (hydrogen) oxide powder containing the metal (hydrogen) oxide layer is held in the void formed by the heat-fusible resin (heat-fusible fiber), that is, the heat-fusible resin (heat The weld fibers constitute a void in the structure.

(the second aspect)

Fig. 1(e) shows an example in which the metal-containing (hydrogen) oxide layer 100 contains the heat-fusible resin A. The metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A is obtained by melting the heat-fusible resin A in a mixture containing the metal (hydrogen) oxide D powder and the heat-fusible resin A. In this example, the powder of the metal (hydrogen) oxide D in the metal-containing (hydrogen) oxide layer is fixed in a state in which a part of the powder is covered by the heat-fusible resin A. (also known as bonding or fixing).

In the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A, the metal (hydrogen) oxide D is fixed by a part of the molten heat-fusible resin A when it is cured. Prevent powder loss. In addition, the heat-fusible resin A is blended in such a manner that the entire metal (hydrogen) oxide D is not coated, and the metal (hydrogen) oxide D has a portion that is not covered by the heat-fusible resin A, and is used in the sheet. It is guaranteed to be in contact with water and dissolved.

In the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A, only the metal (hydrogen) oxide D and the heat-fusible resin A may be contained. Further, in the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A, in addition to the metal (hydrogen) oxide D and the heat-fusible resin A, fibers, an effect accelerator, and the like may be contained. Further, the heat-fusible resin A may be fibrous in itself.

In this aspect, the metal-containing (hydrogen) oxide sheet may have a metal (hydrogen) oxide containing the heat-fusible resin A for the purpose of imparting functionality such as surface modification or imparting strength (rigidity). A multilayer structure (not shown) of the other layers 300 is laminated on one side or both sides of the layer 120.

(3rd aspect)

Fig. 1(f) shows an example in which a layer adjacent to the metal (hydrogen) oxide layer 100 contains a heat-fusible resin B. The layer 200 containing the heat-fusible resin B adjacent to the metal (hydrogen) oxide layer is provided with a heat-fusible resin B on the surface of the metal-containing (hydrogen) oxide layer 100, and It is obtained by melting the heat-fusible resin B by heat. In this example, the powder of the metal (hydrogen) oxide D in the metal (hydrogen) oxide layer is fixed in a state in which a part of the powder is covered by the heat-fusible resin B.

The metal (hydrogen) oxide D contained in the metal-containing (hydrogen) oxide layer 100 is obtained by curing the molten heat-fusible resin B in the layer 200 of the heat-fusible resin B adjacent thereto. A part is covered and fixed to prevent powder loss. Further, the metal (hydrogen) oxide D has a portion which is not covered with the heat-fusible resin B, and ensures contact and elution with water when the sheet is used.

The layer 200 containing the heat-fusible resin B may contain only the heat-fusible resin B. Moreover, in the layer 200 containing the heat-fusible resin B, in addition to the heat-fusible resin B, a fiber, an effect accelerator, etc. may be contained. When the other components are contained, the layer 200 containing the heat-fusible resin B is provided with a mixture of the heat-fusible resin B and the other components on the surface of the metal-containing (hydrogen) oxide layer 100, and the heat is used. The heat-fusible resin B is obtained by melting.

The metal-containing (hydrogen) oxide sheet exemplified in Fig. 1(f), in detail, has a layer 200 comprising a heat-fusible resin B and a powder composed of a metal (hydrogen) oxide. The three-layer structure of the metal (hydrogen) oxide layer 100 and the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A. In the case of this example, the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A also contributes to prevention of oxidation of the metal (hydrogen) contained in the metal-containing (hydrogen) oxide layer 100 disposed as an intermediate layer. The powder occurs. Further, here, the metal (hydrogen) oxide layer 100 and the metal (hydrogen) oxide layer containing the heat fusion resin A are provided. 120 is illustrated and described in terms of the respective layers, but the two layers are integrally formed, and the composition of the metal-containing (hydrogen) oxide layer 120 forming the single-layer heat-fusible resin A is also covered. In the sample. According to this aspect, particularly in the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A, when the powder of the metal (hydrogen) oxide is deposited on the surface side, the powder can be effectively prevented from falling off.

In this aspect, the layer 200 containing the heat-fusible resin B may be provided on both sides of the metal-containing (hydrogen) oxide layer. That is, for example, the composition (not shown) including the layer 200 containing the heat-fusible resin B, the metal-containing (hydrogen) oxide layer, and the layer 200 containing the heat-fusible resin B is included in the present aspect. Inside.

In this aspect, the metal-containing (hydrogen) oxide sheet may have a metal (hydrogen) oxide layer and a heat-fusible resin for the purpose of imparting functionality such as surface modification or imparting strength (rigidity). In the outer surface of the layered body of the layer B of B, a multilayer structure (not shown) of the other layer 300 is laminated on one side or both sides.

(the fourth aspect)

The metal-containing (hydrogen) oxide sheet of the present invention described above can also be formed by heat sealing. As an example, Fig. 1(g) shows a configuration in which another layer 300 containing a heat-fusible resin is laminated on both surfaces of the metal-containing (hydrogen) oxide layer 100, and the four sides are heat-sealed.

(5th aspect)

Fig. 1(h) shows an example in which an adhesion layer is provided adjacent to the metal-containing (hydrogen) oxide layer 100. Adjacent layer 500 adjacent to the metal-containing (hydrogen) oxide layer is formed by a metal-containing (hydrogen) oxide layer An adhesive layer can be obtained on the surface. The layer is not particularly limited as long as it exhibits a function of preventing the adhesion of the metal (hydrogen) oxide contained in the metal-containing (hydrogen) oxide layer 100, and examples thereof include a hot-melt adhesive.

In detail, the metal-containing (hydrogen) oxide sheet shown in Fig. 1(h) is shown between the metal-containing (hydrogen) oxide layer 100 and the other layer 300, and is provided with a heat-sealing such as a thermoplastic resin. The adhesive layer 500 is formed by applying a layer to the next layer by thermal fusion processing.

More specifically, the metal-containing (hydrogen) oxide sheet exemplified in FIG. 1(h) is on the opposite side of the metal-containing (hydrogen) oxide layer 100 from the adhesive layer 500, and has thermal fusion properties. The metal (hydrogen) oxide layer 120 of the resin A. The metal-containing (hydrogen) oxide sheet of the example shown in Fig. 1(h) is also the same as the case of the example shown in Fig. 1(f), and the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A contributes to In the metal-containing (hydrogen) oxide layer 100 disposed as an intermediate layer, the metal (hydrogen) oxide contained therein is powdered. Here, the metal-containing (hydrogen) oxide layer 100 and the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A are illustrated and described in terms of their respective layers, but the two layers are The composition of the metal-containing (hydrogen) oxide layer 120 containing a single layer containing the heat-fusible resin A is also included in this embodiment. According to this aspect, particularly in the metal-containing (hydrogen) oxide layer 120 containing the heat-fusible resin A, when the powder of the metal (hydrogen) oxide is deposited on the surface side, the powder can be effectively prevented from falling off.

In this aspect, the other layer 300 sandwiching the adhesive layer 500 may be disposed on both sides of the metal-containing (hydrogen) oxide layer. That is, for example, sequentially includes: other layers 300, subsequent layers 500, The structure (not shown) of the metal-containing (hydrogen) oxide layer, the subsequent layer 500, and the other layer 300 is within the scope of the present aspect. At this time, the adhesive layers 500 provided on both sides and the other layers 300 may be the same or different. The other layer 300 is a layer provided for the purpose of imparting functionality such as surface modification or imparting strength (rigidity), and the details thereof will be described later.

(6th aspect)

The metal-containing (hydrogen) oxide sheet of the present invention described above can also be formed by embossing. As an example, Fig. 1(i) shows a structure in which a layer 300 is laminated on both surfaces of a metal-containing (hydrogen) oxide layer 120 containing a heat-fusible resin A, and delamination is performed by embossing.

The configuration of the metal-containing (hydrogen) oxide sheet of the present invention will be described above using FIGS. 1(a) to 1(i). However, these are examples, and other configurations, such as the combinations of the various aspects illustrated, are also encompassed within the scope of the invention. For example, the layer as the metal-containing (hydrogen) oxide layer 100 shown in the drawing may also be a metal-containing (hydrogen) oxide layer 110 containing fibers F or a metal-containing (hydrogen) oxide layer containing a heat-fusible resin A. 120 may alternatively be a layer contained in both the fiber F and the heat-fusible resin A. Likewise, the composition of the interlayer replacement layers is also encompassed within the scope of the invention.

Hereinafter, the details of the constituent elements of the metal oxide-containing and/or metal hydroxide-containing sheet of the present invention will be described.

[Metal-containing layer (layer containing metal oxide and/or metal hydroxide)]

The nonwoven fabric of the present invention is provided with a layer containing a metal component. Here, there will also be metal The layer of the component is described as a layer containing a metal component, a layer containing a metal oxide and/or a metal hydroxide, or a layer containing a metal (hydrogen) oxide. That is, the above metal component exists in the form of a metal oxide and/or a metal hydroxide. The metal oxide and/or metal hydroxide is contained in the form of a powder (particle). The metal oxide-containing and/or metal hydroxide-containing layer may contain only a metal oxide, or may contain only a metal hydroxide or a metal oxide and a metal hydroxide. The metal oxide and the metal hydroxide are not limited to a single type, and may also contain a plurality of types. Further, in the layer containing a metal oxide and/or a metal hydroxide, a fiber, a heat-fusible resin, an effect accelerator, or the like may be contained in addition to the metal oxide and/or the metal hydroxide.

(Metal oxide)

The metal oxide used in the present invention is a metal oxide which is a strong base when it comes into contact with water, and is preferably an oxide of a divalent metal, more preferably an oxide of a metal of a Group 2 element of the periodic table, and a particularly good MO ( The above-mentioned M is a metal oxide represented by Mg, Ca, Sr or Ba), and an oxide of an optimum alkaline earth metal. Non-limiting examples are preferably, for example, magnesium oxide (11.4), calcium oxide (12.7), cerium oxide (13.2), cerium oxide (13.4), and manganese oxide (10.6). Further, the numerical value in parentheses after the substance name indicates the value of the acid dissociation constant pKa. The metal oxide used can be selected for the purpose of use or desired effect. For example, in the use which comes into contact with food, calcium oxide is preferably used from the viewpoint of safety and the like. These metal oxides may be used singly or in combination.

(metal hydroxide)

The metal hydroxide used in the present invention is a metal hydroxide of a strong base when it comes into contact with water, preferably a hydroxide of a divalent metal, more preferably a hydroxide of a metal of a Group 2 element of the periodic table, Particularly preferred is a metal hydroxide represented by M(OH) ₂ (M-based Mg, Ca, Sr or Ba) or a hydroxide of an optimum alkaline earth metal. Non-limiting examples are preferably, for example, magnesium hydroxide (11.4), calcium hydroxide (12.7), barium hydroxide (13.2), barium hydroxide (13.4), and manganese hydroxide (10.6). The value in parentheses after the substance name indicates the value of the acid dissociation constant pKa. The metal hydroxide used can be selected for the purpose of use or desired effect. For example, in the use which comes into contact with food, calcium hydroxide is preferably used from the viewpoint of safety and the like. These metal hydroxides may be used singly or in combination.

Accordingly, the metal component-containing layer contains a layer of a metal oxide and/or a metal hydroxide, and the metal component constituting the metal oxide and/or the metal hydroxide is the metal oxide and/or metal hydrogen. When the oxide is in contact with water, it becomes a metal component of a strong base. The metal component is preferably a divalent metal, more preferably a metal of the Group 2 elemental metal of the periodic table, a particularly preferred system M (the above-mentioned M-based Mg, Ca, Sr or Ba), and an optimum alkaline earth metal.

The metal oxide and/or metal hydroxide used in the present invention is in the form of a powder (particle). The metal oxide and/or metal hydroxide in the form of a powder (particle) can be obtained by any method known in the art, and a vending product can also be purchased from a manufacturer. For example, in the case of calcium oxide, for example, Okhotsk calcium of Natural Japan Co., Ltd., and scallop shell calcined powder of UNICERA Co., Ltd., and the like can be suitably used. Further, in the case of, for example, calcium hydroxide, SCALLOW (registered trademark) manufactured by, for example, Ryokan Chemical Co., Ltd. and sold by Lingjiang Chemical Co., Ltd., etc., can be suitably used. Further, in the case of calcium oxide or calcium hydroxide, the calcium material may suitably use calcium (calcium carbonate) obtained from scallop shells, but is not limited thereto, and may be other Shells of shellfish (such as shells of oysters, etc.), bones of animals (such as shells of sea urchins, etc.) and minerals.

The average particle diameter of the metal oxide and/or metal hydroxide powder (particles) is not limited, but is preferably 1 to 1000 μm, more preferably 2 to 800 μm. If the average particle diameter is too small, there is a concern that the work efficiency is lowered due to falling off from the sheet (non-woven fabric) or scattering due to scattering in the production step. Further, if the average particle diameter is too large, it may be difficult to uniformly mix the entire nonwoven fabric.

(fiber)

As the fine fiber, natural fibers such as pulp, crepe, hemp, cotton, crepe, wool, and mineral fibers; synthetic fibers such as polylactic acid, nylon, polyvinyl alcohol (PVA), and polymer absorbent fiber (SAF) can be used. Since these fibers have water absorbing properties, they can be used as a water-absorbent material to promote contact and dissolution of metal (hydrogen) oxides with water when used in a metal-containing (hydrogen) oxide sheet. Further, the fibers of the present invention may also use non-absorbent fibers. The heat-fusible resin described below can also be used in the form of fibers. These fiber systems can be used in the form of, for example, defibrated staple fiber. These fibers may be used in combination of two or more kinds.

(thermal fusion resin)

The heat-fusible resin of the present invention is a binder resin in which a constituent component is bonded. Further, the heat-fusible resin has an effect of imparting strength to a metal-containing (hydrogen) oxide sheet, and the metal-containing (hydrogen) oxide sheet can be easily maintained in shape by containing a heat-fusible resin.

The heat-fusible resins A and B can bond metal (hydrogen) oxides to each other, and when other components are contained, the metal (hydrogen) oxide can be bonded to other components. The heat-fusible resins A and B are prepared so as not to interfere with the contact and elution of the metal (hydrogen) oxide with water, and to facilitate melting and solidification without being coated with the entire amount of the metal (hydrogen) oxide powder (particles).

The heat-fusible resin may be in the form of fibers or in the form of particles. From the viewpoint of making the strength higher, the heat-fusible resin is preferably fibrous. The heat-fusible resin may also be in the form of, for example, staple fiber.

Examples of the heat-fusible resin include polyethylene terephthalate (PET) such as polyethylene (PE), polypropylene, and low-melting polyethylene terephthalate; and ethylene ‧ vinyl acetate copolymer ( EVA), low melting point polyamine, low melting point polylactic acid, polybutylene succinate, and the like.

The heat-fusible resin may be a composite of two or more types of resins. For example: a core-sheath fiber composed of a core portion and a sheath portion; a side-by-side type fiber in which one half of the one side and the other half are unilaterally formed of different resins in a vertical section in the longitudinal direction; a core shell having a core and a shell composed of different resins Particles, etc. Among them, when the properties of the heat-fusible resin are to be exerted in the state of improving the rigidity of the nonwoven fabric, the core-sheath fiber is preferred.

The core sheath fiber may, for example, be a PP/PE composite core comprising a core portion composed of a polypropylene fiber (melting point: 160 ° C) and a sheath portion formed of polyethylene (melting point: 130 ° C) formed on the outer periphery of the core portion. Sheath fiber. Further, other core sheath fibers may be, for example: PP/EVA composite core sheath fiber, PET/low melting point PET composite core sheath fiber, high density polyethylene/low density polyethylene composite core sheath fiber, PET/PE composite core sheath fiber, polyamine/low melting point polyamine compound Core sheath fiber, polylactic acid/low melting point polylactic acid composite core sheath fiber, polylactic acid/polybutylene succinate composite core sheath fiber, and the like. Among the core sheath fibers, a composite core sheath fiber having a sheath portion made of polyethylene, such as a PP/PE composite core sheath fiber, a PET/PE composite core sheath fiber, and a PE/PE composite core sheath fiber, is preferable.

The heat-fusible resin is preferably made of (1) PET heat-fusible fiber, (2) composite core-sheath fiber provided with a sheath portion made of PET, (3) polyethylene heat-fusible fiber, and (4) At least one selected from the group consisting of a composite core-sheath fiber of a sheath portion made of polyethylene, (5) an EVA heat-fusible fiber, and (6) a composite core-sheath fiber having a sheath portion formed of EVA, and more preferably At least one selected from the group consisting of polyethylene heat-fusible fibers and core-sheath fibers having a sheath portion made of polyethylene.

Two or more types of heat-fusible resins may be used in combination. In other words, the heat-fusible resins A and B may be the same heat-fusible resin or different heat-fusible resins. Each of the heat-fusible resin A and the heat-fusible resin B may be a single type of heat-fusible resin, or a plurality of types of heat-fusible resins may be used in combination. The metal-containing (hydrogen) oxide sheet contains the other layer 300 described later, and the other layer 300 contains the heat-fusible resin, and the heat-fusible resin contained in the other layer 300 can be combined with the heat-fusible resin A. And B may be the same or different, and a single type may be used, and a plurality of types may be used in combination.

(other layers)

The metal-containing (hydrogen) oxide sheet of the present invention is in addition to a metal (hydrogen) oxide layer In addition to 100, 110, and 120, other layers 300 may be included for the purpose of imparting functionality such as surface modification or imparting strength (rigidity).

The other layer 300 may be any sheet having a moisture property (water permeability) and/or a moisture absorption property (water absorption property) such as non-woven fabric, cloth, paper, or the like. Also, any film can be used. The other layer 300 may also contain a heat-fusible resin. When a film having a relatively low water permeability on one side of a metal (hydrogen) oxide sheet is used, the antibacterial agent can be prevented from eluting from the surface when the sheet is used. That is, it is possible to promote dissolution of the antibacterial agent from the other side.

The surface of the other layer 300 which is an outer layer of the metal (hydrogen) oxide-containing sheet may be subjected to surface processing for imparting irregularities or the like, or processing for forming holes or slits. For example, in the use of a food tray mat or the like, an apertured film having a plurality of pores such as a surface material of a sanitary material or a slit containing a surface of a metal (hydrogen) oxide sheet can be preferably used. film. According to this configuration, when the sheet is used, metal (hydrogen) oxide can be easily eluted by using a hole or a slit, and the liquid droplets from the food can be absorbed into the layer inside the metal (hydrogen) oxide sheet. .

(effect accelerator)

In the metal-containing (hydrogen) oxide sheet of the present invention, one type or a plurality of effect accelerators may be blended in combination with the use thereof.

The effect accelerator may, for example, be an oil base, a moisturizer, a touch enhancer, a surfactant, a polymer, a viscosity increasing gel, a solvent, a propellant, an antioxidant, a reducing agent, an oxidizing agent, a preservative, Antibacterial agent, chelating agent, pH adjuster, acid, carbonic acid Salt, alkali, powder, inorganic salt, ultraviolet absorber, whitening agent, vitamins and derivatives thereof, anti-inflammatory agent, anti-inflammatory agent, hair growth agent, blood circulation promoter, stimulant, hormone, anti-wrinkle agent, Anti-aging agent, firming agent, cold feeling agent, temperature sensitive agent, wound healing promoter, stimulating mitigating agent, analgesic agent, cell activator, plant ‧ animal ‧ microbial extract, itch inhibitor, keratin stripping ‧ dissolution agent, Keptides, cooling agents, astringents, enzymes, nucleic acids, perfumes, pigments, colorants, dyes, pigments, metal-containing compounds, unsaturated monomers, polyols, polymeric additives, anti-inflammatory analgesics, antifungals, anti-drugs Histamine, hypnotic sedative, Ningshen, antihypertensive, antihypertensive, antibiotic, anesthetic, antibacterial, anti-epileptic, coronary vasodilator, crude drug, adjuvant, humectant, Adhesives, sticky substances, antipruritic agents, keratin softening strippers, oily raw materials, ultraviolet blocking agents, antiseptics, antioxidants, liquid substrates, fat soluble substances, polymers Acid, additives, metal soaps, water-absorbing materials.

The effect enhancer can be formulated in the metal-containing (hydrogen) oxide layer 100, 110, 120. Further, when the metal (hydrogen)-containing oxide sheet is a multilayer structure containing a metal (hydrogen) oxide layer and other layers, it may be incorporated in any one or a plurality of layers of the plurality of layers.

(heat sealing processing)

The heat sealing is a method in which heat is applied by a heating means such as a heat sealer to carry out interlayer bonding. In the present invention, for example, a metal-containing (hydrogen) oxide layer composed only of a metal (hydrogen) oxide is used as an intermediate layer, and a layer 200 containing a heat-fusible resin is disposed on both surfaces thereof, and heat-sealing is performed on four sides. Thereby, a metal-containing (hydrogen) oxide sheet having a multilayer structure can be formed.

(following layer)

The method of forming the layer is not particularly limited, and is preferably an underlayer obtained by hot melt processing. The hot melt processing method melts and extrudes the thermoplastic resin and applies the sheet and the sheet to a subsequent processing method. The interlayer bonding for the metal-containing (hydrogen) oxide layer to be bonded to other layers can be used.

The thermoplastic resin used for the hot-melt processing may be, for example, an ethylene ‧ vinyl acetate copolymer (EVA) or the like, and a resin generally known as a hot-melt adhesive can be used.

(embossing processing)

The embossing process uses a stamper in which a concave and convex pattern is engraved to perform a strong press, and applies heat processing. This method is also capable of inter-layer bonding for multilayer construction. Further, the method can also be used for subjecting a metal-containing (hydrogen) oxide sheet having a single layer or a multilayer structure to surface processing such as unevenness.

(content ratio of ingredients)

The amount of metal (hydrogen) oxide in the metal-containing (hydrogen) oxide sheet varies depending on the application and the desired effect, and the total amount of the sheet is from the viewpoint of exhibiting the antibacterial property of the metal (hydrogen) oxide. The amount of the powder in the middle is preferably 0.01% by mass or more, more preferably 0.2% by mass or more, particularly preferably 0.5% by mass or more, and most preferably 1% by mass or more. In addition, from the viewpoint of the deodorizing property of the metal (hydrogen) oxide, the amount of the powder in the total amount of the sheet is preferably 1% by mass or more, and more preferably, the amount of the gas to be deodorized is different. 3 mass% or more, further preferably 5% by mass or more, particularly preferably 8% by mass or more, and most preferably 10% by mass or more. Also, from the viewpoint of preventing the occurrence of powder of metal (hydrogen) oxide, The amount of the metal (hydrogen) oxide powder which is contained in the total amount of the metal-containing (hydrogen) oxide sheet is preferably 60% by mass or less, more preferably 50% by mass or less, and particularly preferably 40% by mass or less.

(base weigh)

The basis weight of the metal (hydrogen)-containing oxide sheet can be appropriately set according to the use. For example, it is preferably 10 to 4000 g/m ² , more preferably 30 to 3000 g/m ² , and particularly preferably 50 to 300 g/m ² . If the basis weight is too small, it may be difficult to produce a uniform sheet (non-woven fabric); if the basis weight is too large, the treatment at the time of use may be deteriorated.

(Formation of a layer containing a metal oxide and/or a metal hydroxide by a dry method)

In the present invention, the metal-containing (hydrogen) oxide layer is a layer provided by a dry method. The dry process system that can be used in the present invention covers any layer formation method that does not use water.

(Method for producing sheet containing metal oxide and/or metal hydroxide)

For example, in the case of producing a metal (hydrogen)-containing oxide layer by a fiber web forming apparatus adopting an air-laid method, and other layers are contained, a method of separately laminating other layers including a metal-containing (hydrogen) oxide layer can be used. In such a method, a heat-fusible resin B such as polyethylene (PE) is placed on the surface of the metal-containing (hydrogen) oxide layer, and the heat-fusible resin B is melted by heat to be joined. Or when a metal (hydrogen)-containing oxide layer (for example, a metal-containing (hydrogen) oxide layer 120 containing a heat-fusible resin A) is produced by a fiber web forming apparatus adopting an air-laid method, it is used for transporting to a metal-containing layer. The carrier of the fiber mesh layer of the (hydrogen) oxide layer 120 uses the other layer 300 of the present invention, whereby a laminate of the other layer 300 and the metal (hydrogen)-containing oxide layer 120 can be formed, and the present invention can also be obtained. A metal-containing (hydrogen) oxide sheet composed of layers. Also, it can be made separately. Each layer of the metal (hydrogen) oxide sheet is joined by embossing or heat sealing. Further, on at least one surface of the joint surface of each layer of the metal (hydrogen) oxide-containing sheet, an adhesive layer (adhesive layer) is provided by a hot-melt adhesive such as a thermoplastic resin, and then hot-melt processing is used. A method of joining the layers and the like. In order to prevent contact and dissolution of metal (hydrogen) oxide with water at the time of production, in the present invention, the laminates are all carried out by a dry method.

(Manufacturing method of sheet containing metal oxide and/or metal hydroxide by air-laid method)

The method for producing a metal (hydrogen)-containing oxide sheet according to the present embodiment which adopts the air-laid method includes, optionally, a defibration step, a mixing step, a web forming step, and a bonding step.

(de-fibration step)

The defibrating step is a step of defibrating the material in the form of the staple fiber by defibrating with an air stream to obtain the defibrated staple fiber.

The defibration method in which the staple fiber is performed by the air flow is to form an air flow by using a blower or the like, and then the staple fiber is supplied to the air flow, and the fiber is defibrated by the agitation effect of the air flow.

The defibration method preferably utilizes a swirling air stream for defibration. According to the defibrating method using the swirling air flow, the staple fiber can be sufficiently defibrated, and when the airlaid web is formed by the airlaid method, the dispersibility of the defibrated staple fiber can be further improved.

A method of defibrating a swirling air stream is, for example, a method in which a staple fiber is introduced into a blower and then defibrated by a blower. Further, a method in which the air is blown in the circumferential direction of the cylindrical container by the air blower to form a swirling flow, and the short fiber is supplied to the swirling flow, and the mixture is agitated to defibrate.

The flow rate of the air stream is appropriately selected in accordance with the amount of the staple fiber, and is usually in the range of 10 to 150 m/sec.

(mixing step)

The mixing step is a step of mixing a powder (particle) of a metal (hydrogen) oxide and a material (in the case of containing) of a fiber of a defibrated staple fiber to obtain a raw material of the fiber web. Any other material can be mixed at the same time. The shape of any other material may be fibrous or particulate. Examples of any other material include, for example, a heat-fusible resin, an effect accelerator, and the like which are added as needed. The order of addition of the materials is not particularly limited, and the materials may be added by, for example, scattering or the like in a step further than the mixing step.

In order to improve the dispersibility of the defibrated staple fiber, it is preferred to stir the defibrated staple fiber with other materials. However, in order to prevent breakage of the defibrated staple fiber, it is preferred not to use agitation of mechanical shearing force, but to apply agitation using an air stream.

The mixing step can be carried out after the defibrating step or simultaneously with the defibrating step. In the case where the mixing step is carried out simultaneously with the defibrating step, the defibrated staple fiber is mixed with any material by the air flow in the defibrating step. Also, it is also possible to spread the particles described later. In the step, powder (particles) of metal (hydrogen) oxide and/or arbitrary particles are introduced into the fiber formation line of the defibrated staple fiber, and mixing is performed.

(Fiber web forming step)

The web forming step is a step of obtaining an airlaid web from the web material by an airlaid process. The airlaid method here is a method of forming a fiber web by three-dimensional random accumulation of fibers by air flow.

(particle scattering step)

The particle dispersing step is a step of formulating a powder (particle) morphological material in a web material by a known method. Any one of a method of forming a fiber web by mixing a powder (particle) morphological material in a fiber, or a method of dispersing it on a surface of a fiber web or a carrier sheet may be used.

In the web forming step of the present embodiment, for example, the web forming apparatus 1 shown in Fig. 2 is used. The web forming apparatus 1 includes a conveyor 10, a gas permeable endless belt 20, a web material supply means 30, a first slide supply means 40, a second slide supply means 50, and a suction box 60.

Here, the conveyor 10 is composed of a plurality of rollers 11 . The gas permeable endless belt 20 is mounted on the conveyor 10 and rotated. The web material supply means 30 supplies the web material together when supplying the air stream to the gas permeable endless belt 20. The first carrier supply means 40 supplies the first carrier 41 to the gas permeable endless belt 20. The second slide supply means 50 supplies the second slide to the first slide 41 which passes through the gas permeable endless belt 20 51. The suction box 60 draws the gas permeable endless belt 20 from the inside thereof.

In the web forming apparatus 1, the web material supply means 30 is disposed above the gas permeable endless belt 20, and the first sheet supply means 40 is disposed upstream of the gas permeable endless belt 20, the second slide. The supply means 50 is disposed further downstream than the gas permeable endless belt 20.

In the web forming step using the web forming apparatus 1, the conveyor 10 is driven by rotating the rolls 11 in the same direction, and the gas permeable endless belt 20 is rotated. Further, the first carrier 41 is successively introduced from the first carrier supply means 40 so as to be in contact with the upper end of the gas permeable endless belt 20.

Next, while sucking the gas permeable endless belt 20 by the suction box 60, the air flow is lowered from the web material supply means 30 together with the web material, and the fiber mixture is dropped and accumulated on the gas permeable endless belt 20. On the first slide 41. Thereby, an airlaid web W is formed.

Next, the second carrier 51 is supplied to the upper side of the air-laid web W by the second carrier supply means 50, whereby a laminated sheet containing the air-laid web is obtained.

(bonding step)

The bonding method is preferably a thermal bonding method from the viewpoint of bonding in a state where water is not used. The bonding step by thermal bonding is performed by heat-treating the air-laid fiber web so that the defibrated staple fibers are bonded to each other by using a heat-fusible resin. A step of.

The heat treatment of the air-laid web may be, for example, hot air treatment or infrared irradiation treatment, and is preferably hot air treatment from the viewpoint of a low-cost device.

The hot air treatment system may be, for example, a method in which an air-laid web is brought into contact with a hot air through dryer having a ventilating rotating drum on a peripheral surface thereof, and a heat treatment method (hot air circulation rotary drum method) is performed; The net fiber web is subjected to a heat treatment method (hot air circulation type oven type) by passing a hot air through an air-laid web through a box dryer.

In the present embodiment, when the airlaid fiber web is formed by sandwiching the first carrier and the second carrier to form a laminated sheet, the laminated sheet can be directly subjected to hot air treatment. The first carrier and the second carrier can be peeled off from the airlaid web after hot air treatment. The heat treatment temperature is set to a temperature at which the heat-fusible resin melts.

After the bonding step, the compression treatment may be performed by a heating roller for the purpose of finely adjusting the thickness and density of the metal (hydrogen) oxide-containing sheet.

(Effect)

In the above production method, the powder (particle) of the metal (hydrogen) oxide can be directly contained in the metal-containing (hydrogen) oxide layer in the form of powder (particles) without passing through water. Therefore, it is possible to prevent the possibility that the metal (hydrogen) oxide becomes a metal carbonate due to the production step, and the produced sheet can contain a metal (hydrogen) oxide as an antibacterial agent. 俾 can have good antibacterial properties. Moreover, the sheet produced as described above also has good antiviral properties.

[Examples]

Hereinafter, the present invention will be more specifically described by way of examples, but the invention is not limited to the following examples. In the following examples, the metal (hydrogen) oxide is calcium oxide. That is, the metal component uses a calcium component.

[Example 1] <Manufacture of calcium oxide containing sheet>

Polypropylene (PE) heat-fusible fiber (melting point: about 135 ° C) and staple fiber polyethylene terephthalate (PET) fiber (denier 3.3 dtex, fiber length 5 mm), respectively, using a swirling flow The jet stream defibrating device performs defibration treatment to obtain defibrated staple fiber.

The polyethylene (PE) powder and the calcium oxide obtained by calcining the shell (Okhotsk calcium F-015, manufactured by Natural Japan Co., Ltd., having an average particle diameter of about 15 μm) are mixed at a ratio of 80/20 (mass ratio). A mixture of particles of PE powder and calcium oxide is obtained.

Next, the polyethylene (PE) heat-fusible fiber in the form of defibrated staple fiber, the PET fiber in the form of defibrated staple fiber, and the particle mixture of PE powder and calcium oxide are in a ratio of 50/50/5 (mass ratio) The air stream is uniformly mixed to obtain a fiber web material containing PE/PET/calcium oxide.

Next, using the web forming apparatus 1 shown in Fig. 2, a sheet containing an air laid web is formed from the web material.

Specifically, the first carrier sheet 41 is successively introduced into the gas permeable endless belt 20 that is attached to and detached from the conveyor 10 by the first carrier supply means 40.

While sucking the gas permeable endless belt 20 by the suction box 60, the air flow is dropped from the web material supply means 30 together with the web material to be accumulated on the first carrier 41. At this time, the web material was supplied in such a manner that the basis weight of the staple fiber web per airlaid web portion became 100 g/m ² . On the second layer 51 of the upper layer of the upper layer, a sheet containing an airlaid web is obtained. A PET spunbonded nonwoven fabric (base weight: 15 g/m ² ) was used for both the first and second slides of the slide.

The sheet containing the air-laid fiber web was subjected to hot air treatment at 150 ° C by a hot air circulation type oven-type box dryer, and after the treatment, the first and second sheets were peeled off. Further, a calcium oxide-containing sheet having a basis weight of 105 g/m ² was obtained.

[Embodiment 2]

A calcium oxide-containing sheet was obtained in the same manner as in Example 1 except that the calcium oxide system was set to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Example 3]

The core portion of the staple fiber is polyethylene terephthalate (PET) and the sheath portion is polyethylene Ethylene (PE) core-sheath type heat-fusible composite fiber (PET/PE composite core sheath fiber, fineness 3.3 dtex, fiber length 5 mm, sheath melting point 130 ° C), defibration treatment using a rotary flow jet air defibration device , defibrated staple fiber (web material).

Next, in the web forming apparatus 1 shown in Fig. 2, on the gas permeable endless belt 20 which is mounted and moved on the conveyor 10, a tissue paper made of wood pulp (base weight 14 g/m ² ) is used. The first carrier supply means 40 is configured to successively introduce the first carrier 41.

While the gas permeable endless belt 20 is sucked by the suction box 60, PE powder is dispersed on the first carrier 41 so as to be 5 g/m ² , and the web material and air flow are made from the web material supply means 30. Drop together and accumulate on it. At this time, the web material was supplied in such a manner that the basis weight of the staple fiber web per airlaid web portion became 110 g/m ² . On the upper surface, the particle mixture of PE powder and calcium oxide was dispersed so as to be 7.5 g/m ² , and the second sheet 51 was formed by laminating paper (base weight: 14 g/m ² ) made of wood pulp as a raw material. A sheet comprising an airlaid web having a basis weight of 150.5 g/m ² was obtained.

In this case, the above-mentioned particle mixture is obtained by using polyethylene (PE) powder and calcium oxide obtained by calcination using a shell (Okhotsk calcium F-015, manufactured by Natural Japan Co., Ltd., having an average particle diameter of about 15 μm). /20 ratio (mass ratio) mixed particle mixture.

The obtained sheet containing the air-laid fiber web was subjected to hot air treatment at 150 ° C by a hot air circulation type oven-type box dryer to obtain a calcium oxide-containing sheet having a basis weight of 150.5 g/m ² . Further, after the hot air treatment, the first and second slides were not peeled off and remained as they were.

[Example 4]

A calcium oxide-containing sheet was obtained in the same manner as in Example 3 except that the calcium oxide was changed to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Example 5]

The defibrated staple fiber and the particle mixture of the PE powder and the calcium oxide are mixed in advance to form a fiber web material containing the particle mixture, and then the air mesh supply means 30 is dropped together with the air flow and accumulated in the first load. The PE powder spread on the sheet 41. At this time, the fiber web material and the particle mixture are mixed according to the manner that the basis weight of the staple fiber web portion per airlaid web portion is 137 g/m ² and the particle mixture is 75 g/m ² , and the fiber mixture containing the particle mixture is supplied. raw material. The PE powder was dispersed thereon in such a manner as to be 5 g/m ² . In this case, the above-mentioned particle mixture is obtained by using polyethylene (PE) powder and calcined calcium obtained by calcination with shells (Okhotsk calcium F-015, manufactured by Natural Japan Co., Ltd., average particle diameter: about 15 μm), according to 20 /10 ratio (mass ratio) mixed particle mixture. Except for the above, a calcium oxide-containing sheet having a basis weight of 250 g/m ² was obtained in the same manner as in Example 3.

[Embodiment 6]

A calcium oxide-containing sheet was obtained in the same manner as in Example 5 except that the calcium oxide system was set to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Embodiment 7]

In addition to the polyethylene (PE) heat-fusible fiber in the form of defibrated staple fiber, the PET fiber in the form of defibrated staple fiber, and the particle mixture of PE powder and calcium oxide, in a ratio of 50/50/35 (mass ratio) The fiber mesh material containing PE/PET/calcium oxide was obtained by uniform mixing with air flow, and the sheet containing the airlaid fiber web was obtained by the basis weight of 135 g/m ² , and the rest were in accordance with Example 1 In the same manner, a calcium oxide-containing sheet having a basis weight of 135 g/m ² was obtained.

[Embodiment 8] <Manufacture of calcium hydroxide containing sheet>

In addition to the use of polyethylene (PE) powder, calcium hydroxide obtained by calcination with shells (Okhotsk calcium OH-I, manufactured by Natural Japan Co., Ltd.), obtained by mixing 80/20 ratio (mass ratio) A calcium hydroxide-containing sheet was obtained in the same manner as in Example 1 except that the particle mixture of PE powder and calcium hydroxide was used.

[Embodiment 9]

A calcium hydroxide-containing sheet was obtained in the same manner as in Example 8 except that calcium hydroxide was used as the Okhotsk calcium OH and Natural Japan Co., Ltd.

[Embodiment 10]

In addition to replacing the PET/PE composite core-sheath fiber, a heat-fusible composite fiber (PP/PE composite core-sheath fiber with a core portion of polypropylene (PP) and a sheath portion of polyethylene (PE) was used instead, and the fineness was 1.7 dtex. The fiber length is 5mm and the sheath melting point is 130°C). A calcium oxide-containing sheet was obtained in the same manner as in Example 3.

[Example 11]

In addition to the first carrier and the second carrier, a PET spunbonded nonwoven fabric (base weight: 15 g/m ² ) was used, and the defibrated staple fiber (web material) was dropped from the air material supply means 30 together with the air flow. cumulative, staple fiber based web portion becomes airlaid weight 107.5g / m ² outside, the rest are in accordance with the same manner as in Example 3 to obtain a basis weight of 150g / m ² of calcium oxide-containing material.

[Embodiment 12]

A calcium oxide-containing sheet was obtained in the same manner as in Example 11 except that the calcium oxide system was set to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Example 13]

A PET spunbonded nonwoven fabric (basis weight: 15 g/m ² ) was used for the first slide and the second slide, and the defibrated staple fiber and the particle mixture of the PE powder and the calcium oxide were mixed in advance to form a mixture containing particles. The web material is then allowed to fall from the web supply means 30 together with the air stream to accumulate. At this time, the fiber web material and the particle mixture are mixed in a manner that the basis weight of the staple fiber web portion per airlaid web portion is 140 g/m ² and the particle mixture is 75 g/m ² , and the fiber web containing the particle mixture is supplied. raw material. The PE powder was dispersed thereon in such a manner as to be 5 g/m ² . Except for the above, a calcium oxide-containing sheet having a basis weight of 250 g/m ² was obtained in the same manner as in Example 3.

[Embodiment 14]

When the web material containing the particle mixture is dropped together from the air stream by the fiber web material supply means 30, the basis weight of the staple fiber web per airlaid web portion is 65 g/m ² , and the particle mixture becomes 150 g / In the m ² manner, the web material and the particle mixture are mixed and the web material is supplied. Except for this, a calcium oxide-containing sheet having a basis weight of 250 g/m ² was obtained in the same manner as in Example 13.

[Example 15]

A calcium oxide-containing sheet was obtained in the same manner as in Example 13 except that the calcium oxide system was set to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Example 16]

A calcium oxide-containing sheet was obtained in the same manner as in Example 14 except that the calcium oxide system was set to Okhotsk Calcium F-2000, manufactured by Natural Japan Co., Ltd., and the particle diameter was 2000 μm or less.

[Example 17]

In addition to the defibrated staple fiber (web material), the fiber defibrated by the fluff pulp and the heat-fusible composite fiber (PET/PE composite core sheath fiber, the fineness of 3.3 dtex, the fiber length of 5 mm, and the short fiber) are used. The fiber containing the defibrated fiber having a melting point of the sheath portion of 130 ° C was obtained in the same manner as in Example 11 except that 70/30 was mixed, and a calcium oxide-containing sheet having a basis weight of 150 g/m ² was obtained.

[Embodiment 18]

When the defibrated staple fiber (web material) is accumulated together with the air flow from the fiber web raw material supply means 30, the fiber web is supplied in such a manner that the basis weight of the staple fiber web portion per airlaid web portion becomes 60 g/m ² A calcium oxide-containing sheet having a basis weight of 100 g/m ² was obtained in the same manner as in Example 17 except that the raw material was supplied with a particle mixture of PE powder and calcium oxide in a manner of 5 g/m ² .

[Embodiment 19]

When the defibrated staple fiber (web material) is accumulated together with the air flow from the fiber web raw material supply means 30, the fiber web is supplied in such a manner that the basis weight of the staple fiber web portion per airlaid web portion becomes 40 g/m ² . The raw material was supplied with a mixture of particles of PE powder and calcium oxide in such a manner that it was 75 g/m ² . Except for the above, a calcium oxide-containing sheet having a basis weight of 150 g/m ² was obtained in the same manner as in Example 17.

[Example 20]

For the first slide, a face paper (basis weight 14 g/m ² ) was used. When the web raw material supply means 30 causes the web material to be accumulated together with the air stream, the web material is supplied in such a manner that the basis weight of the staple fiber web portion per airlaid web portion becomes 84 g/m ² . The second slide-based using a dry non-woven (basis weight of ^{40g / m 2, KS-40} , manufactured by Oji Kinocloth Ltd.). The particle mixture is a PE powder obtained by mixing polyethylene (PE) powder with calcium hydroxide (Okhotsk calcium OH, manufactured by Natural Japan Co., Ltd.) in an 80/20 ratio (mass ratio). a mixture of calcium particles. Except for the above, a calcium hydroxide-containing sheet having a basis weight of 150.5 g/m ² was obtained in the same manner as in Example 17.

[Example 21]

When the web material is mixed with the air stream by the web material supply means 30, the basis weight of the staple fiber per airlaid web portion is 41 g/m ² and the particle mixture is 100 g/m ² . The web material is mixed with the particle mixture and the web material is supplied. Except for this, a calcium hydroxide-containing sheet having a basis weight of 200 g/m ² was obtained in the same manner as in Example 20.

[Example 22]

In addition to the accumulation of the web material together with the air stream from the web material supply means 30, the basis weight of the staple fiber web portion per airlaid web portion is 77.5 g/m ² , and the second slide is used for the face paper. (Base weight: 14 g/m ² ), and a polyethylene film (base weight: 26 g/m ² , manufactured by Daiwakawa Polymer) was bonded to a second carrier by a hot melt resin (5 g/m ² ), and the rest was A calcium oxide-containing sheet having a basis weight of 150 g/m ² was obtained in the same manner as in Example 17.

[Example 23]

In addition to the first slide, a dry non-woven fabric (base weight: 40 g/m ² , KS-40, manufactured by Prince Knitting Paper Co., Ltd.) was used, and the web material was supplied from the web material supply means 30 together with the air. when the cumulative drop, staple fiber based web portion of each reset airlaid than 52.5g / m ^2, and the rest are in accordance with the same manner as in Example 22 to obtain a basis weight of 150g / m ² of calcium oxide-containing material.

[Example 24]

In addition to the first slide, a water-repellent clothing (base weight: 28 g/m ² , #7128, manufactured by SHINWA Co., Ltd.) was used, and the web material was dropped from the air material supply means 30 together with the air flow. The calcium oxide-containing sheet having a basis weight of 150 g/m ² was obtained in the same manner as in Example 22 except that the basis weight of the staple fiber web portion of the air-laid web portion was set to 64.5 g/m ² .

[Example 25]

In addition to the accumulation of the web material together with the air stream from the web material supply means 30, the basis weight of the staple fiber web portion per airlaid web portion is set to 91.5 g/m ² and becomes 7.5 g thereon. a mixture of PE powder and calcium oxide is dispersed in a manner of /m ² , and the obtained sheet containing the air-laid web is subjected to the same heat treatment as in Example 3 without using the second sheet, and then directly A polyethylene film (weight: 26 g/m ² , manufactured by Daiwakawa Polymer Co., Ltd.) was bonded thereto by a hot melt resin (5 g/m ² ), and the basis weight was 150 g/ in the same manner as in Example 22. A calcium oxide containing sheet of m ² .

[Example 26]

In addition to the accumulation of the web material together with the air stream from the web material supply means 30, the basis weight of the staple fiber web portion per airlaid web portion is set to 66.5 g/m ² and becomes 7.5 g thereon. a mixture of PE powder and calcium oxide is dispersed in a manner of /m ² , and the obtained sheet containing the air-laid web is subjected to the same heat treatment as in Example 3 without using the second sheet, and then directly A polyethylene film (weight: 26 g/m ² , manufactured by Daiwakawa Polymer Co., Ltd.) was bonded thereto by a hot melt resin (5 g/m ² ), and the basis weight of 150 g/ was obtained in the same manner as in Example 23. An airlaid web sheet of m ² containing calcium oxide.

[Example 27]

In addition to the accumulation of the web material together with the air stream from the web material supply means 30, the staple fiber basis weight per airlaid web portion is set to 78.5 g/m ² and the resulting air-containing network is formed. The sheet of the fiber web was subjected to the same heat treatment as in Example 3 without using the second carrier, and then the particle mixture of the PE powder and the calcium oxide was dispersed directly on the surface thereof so as to be 7.5 g/m ² . A polyethylene film (weight: 26 g/m ² , manufactured by Daiwakawa Polymer Co., Ltd.) was bonded thereto by a hot melt resin (5 g/m ² ), and the basis weight was 150 g/in the same manner as in Example 24. A calcium oxide containing sheet of m ² .

[Comparative Example 1]

A sheet having a basis weight of 100 g/m ² was obtained in the same manner as in Example 1 except that the particle mixture was not formulated.

[Comparative Example 2]

A sheet having a basis weight of 100 g/m ² was obtained in the same manner as in Example 1 except that the particle mixture was not formulated. Then, a 0.6% by mass aqueous solution of calcium oxide was applied to the above-mentioned sheet by a sprayer, and then the sheet of Comparative Example 2 was obtained by drying. In addition, the application by the atomizer described above was carried out so that the coating amount of the calcium oxide-containing aqueous solution was 200 g/m ² (that is, the amount of the calcium oxide coating amount per solid portion was 1.2 g/m ² ). It was confirmed that the sheet of Comparative Example 2 contained CaCO ₃ (metal carbonate).

[Comparative Example 3]

A sheet was obtained in the same manner as in Example 3 except that the particle mixture of the PE powder and the calcium oxide was replaced with the PE powder alone.

[Comparative Example 4]

A sheet was obtained in the same manner as in Comparative Example 2, except that 0.6% by mass of the calcium oxide-containing aqueous solution was applied instead of the sprayer, and impregnation (impregnation) was employed instead. From the weight after drying, it was confirmed that a solid content of 1.5 g/m ² was imparted. It was confirmed that the sheet of Comparative Example 4 contained CaCO ₃ (metal carbonate).

[Comparative Example 5]

A sheet was obtained in the same manner as in Example 17 except that the mixture of PE powder and calcium oxide dispersed on the web material was replaced with PE powder alone.

[Comparative Example 6]

A sheet was obtained in the same manner as in Example 20 except that the mixture of PE powder and calcium hydroxide dispersed on the web material was replaced with PE powder alone.

[Comparative Example 7]

A sheet was obtained in the same manner as in Example 25 except that the mixture of the PE powder and the calcium oxide dispersed on the web material was replaced with the PE powder alone.

<Performance Evaluation Test>

For the metal-containing (hydrogen) oxide sheet of the examples and the sheets of the comparative examples, the following tests were carried out and the properties were evaluated.

(antibacterial test)

The bactericidal activity calculated by the "Test method for antibacterial properties of fiber products and antibacterial effect" according to Japanese Industrial Standard JIS L1902, or the application of the regulations, to the properties of the bacteria-inhibiting bacteria (antibacterial property) The value size is evaluated. The greater the bactericidal activity value, the higher the antimicrobial activity. The test bacteria used Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Serratia, O-157, MRSA, Salmonella, and Vibrio cholerae.

Specifically, as shown in the following table, the size of the antibacterial property and the bactericidal activity value are given to the five-stage grade, and the ◎, ○, △, ×, and XX symbols are sequentially recorded from the high antibacterial property.

In the present example, when the antibacterial property is ○ or more (that is, the grade indicated by the symbol ○ or ◎), the sample is evaluated to have good antibacterial property (bactericidal property) which can be used as an antibacterial sheet.

(antiviral test)

For antiviral properties, by applying the international standard ISO18184 The antiviral activity value calculated by the "Antiviral Test Method" was evaluated. The greater the value of the antiviral activity, the higher the antiviral activity. The test virus was substituted for norovirus and replaced with feline calicivirus (FCV).

Specifically, as shown in the following table, the magnitude of the antiviral antiviral activity value was given to a three-stage scale, and the ◎, ○, and × symbols were sequentially recorded from the high antiviral property.

In the present example, when the antiviral property is ○ or more (that is, the grade indicated by the symbol ○ or ◎), the sample was evaluated to have good antiviral properties which can be used as an antiviral sheet.

(deodorization test)

The deodorant system was evaluated in accordance with the method specified in the SEK Marking Fiber Product Certification Standard of the General Corporate Legal Fiber Evaluation Technology Conference. The evaluation gas system uses acetic acid gas and hydrogen sulfide gas. The greater the rate of malodor reduction, the higher the deodorizing property (gas removal performance).

Specifically, as shown in the following table, the deodorant property is given a four-stage grade in accordance with the malodor reduction rate, and the ◎, ○, △, and × symbols are sequentially noted from the high deodorant property.

(anti-fungal test)

The antifungal property was evaluated according to the fiber product test (wet method and dry method) of the "anti-fungal test method" of Japanese Industrial Standard JIS Z2911. The wet method omits the treatment by the water flow for 24 hours, and is applied to JIS Z2911. Further, the dry method is implemented in accordance with JIS Z2911.

Specifically, as shown in the following table, the mold growth resistance state is imparted to the three-stage grade in accordance with the growth state of the hyphae, and the ◎, ○, and × symbols are sequentially noted from the high mold resistance.

(Anti-fungal test on food)

For the antifungal property of the food, the sample was placed in a plastic bag with a jig together with the food, placed at room temperature, and evaluated for mildew growth every other week. For the food, a commercial rice cake (raw rice cake, manufactured by Nine-Cham Co., Ltd.), and toast (super-cooked, manufactured by Shimadao Bread Co., Ltd.) were used. The number of inspections was set to three, and a plastic bag with a jig in which only the sample was not loaded and only the food was placed was set as a blank sample.

The evaluation was carried out as follows. First, as long as one of the three blank samples is confirmed to be a mold, the sample in which the mold is slightly found is evaluated as ×. When the blank sample was confirmed to be mold, it was further left for one week, and the sample in which some micro mold was found was evaluated as Δ. At this time, the sample which was not found to be mold was continuously placed, and the sample of the mold was found to be ○ 4 weeks after the start of the test, and no mold was found. The sample evaluation was ◎. Incidentally, one week after the start of the test, one of the three blank samples was confirmed to be mold, and the toast was one week after the start of the test, and one of the three blank samples. Mold was confirmed.

Specifically, as shown in the following table, the mold growth state of the food is applied to the four-stage grade of the mold resistance of the food, and the ◎, ○, △, and × symbols are sequentially noted from the high mold resistance of the food.

(sterilization test)

The "sterilization performance" is evaluated according to the "wet wipes sterilization performance test" prescribed by the Japan Society for Health Materials Industry Association. With respect to the samples of the examples and the comparative examples, water having a weight of 6 times or 10 times the amount of the sample was applied, and the whole of the sample was allowed to permeate for 3 minutes to form a wet tissue. Escherichia coli was used for the test strain.

Specifically, as shown in the following table, the sterilization activity was added to the two-stage grade in accordance with the sterilization activity value, and the ◎ and × symbols were sequentially recorded from the high sterilization property.

(Antibacterial test of liquid medicine)

The antibacterial properties of the drug solution were evaluated as follows. First, the samples of the examples and the comparative examples were cut into a size of 100 × 150 mm, and the whole was allowed to permeate 6 times the weight of water, and after standing for 3 minutes, the liquid medicine was obtained by twisting it. 0.02 ml of a bacterial solution adjusted to have a bacterial count of about 10 ⁸ /ml was added to 2 ml of the chemical solution, and allowed to stand for 5 minutes. The chemical solution after standing was used as a test solution, and 1 ml of the test solution was deactivated by using 9 ml of SCDLP broth medium, and the number of bacteria was measured by a mixed-release plate culture. The commonly used logarithm of the number of bacteria is taken from the common logarithm of the number of bacteria in the control (distilled water), and the common logarithm of the number of bacteria in the sample is deducted to calculate the common logarithmic value difference. Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa were used for the test strains.

Specifically, as shown in the following table, the presence of the common logarithmic value difference or the number of bacteria in the number of bacteria is detected, and the antibacterial property of the drug solution is given to the four-stage grade, and the chemical resistance of the drug solution is high in order to note ◎, ○, △, × symbols.

<Performance evaluation test result>

The results of the performance evaluation test of the metal-containing (hydrogen) oxide sheet of the examples and the sheets of the comparative examples shown in Tables 1-1 to 4 and Table 5 of Figs. 4 to 8 are shown. In addition, in each table indicating the test result, the symbol "-" indicates that the test was not performed.

The metal oxide-containing and/or metal hydroxide-containing sheet of the embodiment of the present invention has antibacterial property (bactericidal property), antiviral property, deodorizing property, antifungal property, and the like under the sheet of the comparative example. The antifungal properties, the sterilization property of the food, and the antibacterial property of the chemical liquid are all good. Further, the metal oxide-containing and/or metal hydroxide-containing sheets of Examples 5 to 7 which contain relatively a large amount of metal oxides and/or metal hydroxides are excellent in antibacterial property (bactericidal property) and antiviral property. In addition, there is still effective or good deodorization.

100‧‧‧Metal (hydrogen) oxide layer

110‧‧‧Fiber-containing metal (hydrogen) oxide layer

120‧‧‧Metal (hydrogen)-containing oxide layer containing heat-fusible resin A

200‧‧‧layer containing heat-fusible resin B

300‧‧‧Other layers

500‧‧‧Next layer

A‧‧‧Hot fusion resin

B‧‧‧Hot fusion resin

D‧‧‧metal (hydrogen) oxide

F‧‧‧Fiber

Claims (9)

A non-woven fabric comprising a nonwoven fabric having a metal component layer, wherein the metal component is in the form of a metal oxide and/or a metal hydroxide, and the nonwoven fabric is produced by a dry manufacturing method without water. The non-woven fabric of claim 1, wherein the layer contains fibers; and the powder of the metal oxide and/or metal hydroxide is held in a void formed by the fibers. The non-woven fabric of claim 1, wherein the layer contains a heat-fusible resin A; and the powder of the metal oxide and/or metal hydroxide present in the layer is thermally welded as a part of the powder The state in which the resin A is coated is fixed. The non-woven fabric of claim 1, wherein the layer adjacent to the layer contains a heat-fusible resin B; and the powder of the metal oxide and/or metal hydroxide present in the layer is partially a part of the powder The state in which the heat-fusible resin B is coated is fixed. The non-woven fabric according to any one of claims 1 to 4 is subjected to heat sealing processing. A non-woven fabric according to any one of claims 1 to 4, wherein an adjacent layer is provided adjacent to the above layer. The non-woven fabric of any one of claims 1 to 4 is subjected to embossing. The non-woven fabric according to any one of claims 1 to 4, wherein the metal oxide and/or metal hydroxide is one or more of MO and/or M(OH) ₂ (the above M system Mg, Ca, Sr). Or Ba) metal oxides and/or metal hydroxides as indicated. The non-woven fabric of claim 8, wherein the metal oxide and/or metal hydroxide is calcium oxide and/or calcium hydroxide.