JP2017149103A - Antibacterial deodorant sheet manufacturing method and antibacterial deodorant sheet - Google Patents

Abstract

An object of the present invention is to provide a method for producing a deodorant sheet using fibers carrying metal ions and using a conventional coater, and an antibacterial deodorant sheet produced in this manner. A fine fiber having a length of 10 μm or less is used as a fiber supporting metal ions. Even if such a short and fine fiber is dissolved or dispersed in a solvent to form a coating liquid, and this is coated with a conventional coater, for example, a gravure coater, a roll coater, a spray coater, a die coater, etc., the coater operates normally. It is possible to do. [Selection diagram] Fig. 1

Description

  The present invention relates to an antibacterial deodorizing sheet having a fiber carrying metal ions as an antibacterial deodorizing functional layer and a method for producing the same. This antibacterial deodorant sheet can be used, for example, as a material for a packaging bag to prevent a bad odor inside the packaging bag. Moreover, this antibacterial deodorizing sheet can be housed in the sealed container together with the contents to prevent the contents from being spoiled and to prevent the odor inside the sealed container.

  Antibacterial deodorant sheets using cellulose fibers carrying metal ions are known. This metal ion-carrying cellulose fiber is described in Patent Document 1, for example, and is commercially available from Kojinsha under the name of Clean Sky.

  This metal ion-carrying cellulose fiber is obtained by dispersing a fiber such as natural pulp or rayon in an aqueous solution of a metal salt and then adding an alkaline aqueous solution to adjust the pH to around 7.0, thereby supporting the metal colloid on the fiber. It is manufactured. In this way, the metal ions supported on the cellulose fibers adsorb odorous substances that cause bad odors, thereby exhibiting deodorizing performance and preventing decay due to their antibacterial action. Examples of the odor substance include odor substances such as ammonia, hydrogen sulfide, mercaptan, and aldehyde.

  However, this metal ion-supporting cellulose fiber is difficult to form into a sheet because of the long fiber. As a general sheeting method, two types of methods are commonly used, but it is difficult to form a sheet by either of these two types of methods.

  That is, one of two commonly used sheet molding methods is to put a thermoplastic resin together with a thermoplastic resin into a melt extrusion molding machine and heat the inside of the melt extrusion molding machine to melt the thermoplastic resin. In this method, the molten resin and the metal ion-carrying cellulose fibers are uniformly kneaded with a screw or the like inside the melt extrusion molding machine, and the kneaded product is extruded into a sheet shape and molded. However, in this method, the length of the metal ion-carrying cellulose fibers is long, so that the shear stress of the kneaded product of the molten resin and the metal ion-carrying cellulose fibers becomes high. For this reason, the metal ion-supporting cellulose fiber is carbonized by shear heat during kneading, and its antibacterial deodorizing performance is lost.

  In addition, among the two commonly used sheet forming methods, another method is a method in which the sheet is dispersed in a solvent such as water and coated on the base sheet. In this method, a coater such as a gravure coater, a roll coater, a screen coater, or a die coater is used, but it is difficult to operate the coater normally due to the long fibers regardless of which coater is used. .

  Therefore, this metal ion-supporting cellulose fiber is formed into a sheet using a papermaking method. That is, the metal ion-carrying cellulose fibers are dispersed in a solvent such as water and put into a papermaking apparatus to be formed into a sheet shape.

JP-A-10-259595

  However, the paper making apparatus is generally a large machine and has a problem that it is difficult to produce a small lot.

  Therefore, the present invention provides a method for producing an antibacterial deodorant sheet using fibers carrying metal ions and using a conventional coater, and the antibacterial deodorant sheet thus produced. Objective.

That is, the invention according to claim 1 is a process for producing a fine fiber having a length of 10 μm or less by refining a fiber carrying metal ions.
Dissolving or dispersing the fine fibers in a solvent and coating the substrate sheet;
It is a manufacturing method of the antibacterial deodorizing sheet characterized by having.

  Next, the invention according to claim 2 is the method for producing an antibacterial deodorizing sheet according to claim 1, wherein the fine fiber is a cellulose fiber.

  Next, the invention according to claim 3 is the method for producing an antibacterial deodorizing sheet according to claim 1 or 2, wherein the metal ions are copper ions.

Next, the invention according to claim 4 is an antibacterial deodorizing sheet having a base sheet and an antibacterial deodorizing functional layer,
An antibacterial deodorant functional layer is composed of fine fibers carrying metal ions, and the fine fibers are fine fibers having a length of 10 μm or less.

  In the present invention, fine fibers having a length of 10 μm or less are used as fibers carrying metal ions. Even if these short and fine fibers are dissolved or dispersed in a solvent to form a coating solution, and this is coated with a conventional coater such as a gravure coater, roll coater, spray coater, die coater, etc., the coater operates normally. Is possible. For this reason, it is possible to manufacture an antibacterial deodorizing sheet of a small lot and a wide variety.

It is a section explanatory view concerning the example of the antibacterial deodorant sheet of the present invention.

  The method for producing an antibacterial deodorant sheet according to the present invention is a method in which fibers carrying metal ions are dissolved or dispersed in a solvent and coated on a base sheet with a conventional coater to form an antibacterial deodorant functional layer. is there. The metal ion-carrying fiber needs to be a fine fiber having a length of 10 μm or less. If the length exceeds this, the normal operation of the coater becomes difficult due to the clogging of the coater, and the coater stops frequently or the coater itself is damaged.

  Cellulose fibers can be suitably used as the fine fiber fibers. Moreover, copper ion, silver ion, zinc ion, etc. can be used as a metal ion.

As described above, as a method of producing a fine fiber carrying metal ions, there are a method of finely pulverizing a fiber such as a natural fiber, and then a method of imparting metal ions, and a method of finely refining after imparting metal ions to a fiber. . Any method may be adopted, but since the cellulose fibers supporting metal ions are commercially available as described above, a method of refining the commercially available metal ion supporting fibers is simple. In order to reduce the size, for example, the treatment may be repeated using a refiner or a high-pressure homogenizer. It can also be refined using a TEPCO oxidation reaction or carboxymethylcellulose reaction, but it must be mechanically refined with a refiner or high-pressure homogenizer to avoid chemical changes in the metal ions supported on the fiber. Is desirable.

  The base sheet may be made of any material. For example, paper such as paperboard, polyester sheet, polyamide sheet, polyethylene sheet, polypropylene sheet, or a multilayer sheet obtained by laminating these. Moreover, you may have a metal vapor deposition film and an inorganic vapor deposition film. As a metal vapor deposition film, an aluminum vapor deposition film can be illustrated as a representative example. Moreover, as an inorganic vapor deposition film, a silicon oxide vapor deposition film and an aluminum oxide vapor deposition film can be illustrated. In addition, you may be a multilayer sheet which has metal foils, such as aluminum foil, in a layer structure.

  Next, an antibacterial deodorizing sheet can be manufactured by dissolving or dispersing fine fibers in a solvent to form a coating liquid, and coating the coating liquid on a base sheet to form an antibacterial deodorizing functional layer. . FIG. 1 is a cross-sectional explanatory view of the antibacterial deodorant sheet 1 manufactured as described above, in which reference numeral 11 indicates a base material sheet, and reference numeral 12 indicates an antibacterial deodorant functional layer. In addition, a solvent may be arbitrary and can use hydrophilic solvents, such as water and alcohol, for example. Further, it may be a non-hydrophilic organic solvent. Moreover, although the binder which adheres a fine fiber can also be mix | blended in a coating liquid, it is not indispensable.

  This coating is possible with conventional coaters. For example, gravure coater, roll coater, spray coater, die coater and the like. As described above, even if these usual coaters are used, their normal operation is possible. It is also possible to perform coating by immersing (dipping) a base sheet in a coating solution and impregnating the fine fibers.

  Moreover, although the antibacterial deodorizing functional layer 12 can be formed on the entire surface of the base sheet 11, it can also be formed in a pattern on a part thereof. For example, when this antibacterial deodorant sheet is used as a packaging bag material, it is possible to partially dispose the antibacterial deodorant functional layer 12 in the central region except for the seal line at the periphery of the packaging bag. .

  In addition, since the antibacterial deodorant functional layer 12 is transparent, if a transparent sheet is adopted as the base sheet 11, the antibacterial deodorant sheet 1 laminated with these layers also becomes transparent, and packaging bags and the like using the same also have their packaging bags. It is possible to observe the inside from the outside.

  The antibacterial deodorant sheet thus obtained can be used, for example, as a material for a take-out packaging bag that contains strongly scented contents such as sugar beet. For example, a sealant film can be laminated on the surface of the antibacterial deodorant functional layer 12 of this antibacterial deodorant sheet to form a laminated body for a packaging bag, and this laminated material can be made into a packaging bag. The form of the packaging bag may be a three-side seal bag, a four-side seal bag, a pillow bag, a standing pouch, or the like.

  And, when these contents are stored in this packaging bag and sealed, the metal ions supported on the fine fibers adsorb the odor-causing substance, so that the odor leaking outside the packaging bag can be significantly reduced. It becomes. For this reason, for example, it is possible to take home the smell of sugar beet etc. purchased by the consumer without transferring it to the belongings. Moreover, since this metal ion has an antibacterial action, it is possible to prevent the stored contents from being spoiled.

  The antibacterial deodorant sheet is also suitable as a material for packaging bags that contain medical tools and medical drugs and are sterilized by radiation. Since the fine fiber carrying the metal ions transmits the radiation without scattering, it can be sterilized by irradiating radiation such as γ rays from the outside of the packaging bag. In addition, the contents and the packaging bag may be decomposed by this radiation to generate low molecular weight odor substances (low molecular weight alcohol, aldehyde, etc.). Adsorb.

  Moreover, this antibacterial deodorizing sheet can be accommodated inside the sealed container together with the contents. For example, a carton can be produced with this antibacterial deodorant sheet, and the food contents cooked at the store can be stored inside the carton and further used inside a plastic sealed container. Examples of contents include Shumai and dumplings. And when this antibacterial deodorizing sheet is housed inside the sealed container together with the contents in this way, it is possible to absorb the smell of the contents housed in the sealed container and reduce the odor leaking to the outside. is there. For this reason, for example, the scent of various cooked foods purchased by consumers can be taken home without being transferred to belongings.

<Example of first group>
An example of the first group is an example in which a multilayer transparent sheet (trade name: GL-AE, thickness: 12 μm) manufactured by Toppan Printing Co., Ltd. is used as a base sheet.

Example 1
Copper ion-supporting pulp (manufactured by Kojin Co., Ltd., trade name: Clean Sky) was dispersed in water and refined using a refiner until the fiber diameter became 5 to 10 nm and the length became about 5 μm. And the obtained dispersion liquid was dried and the microparticles | fine-particles of the fine cellulose fiber were manufactured.

  This fine cellulose fiber was dispersed in water to obtain a coating solution. The concentration is 10% by mass.

  And using the gravure coater, this coating liquid was coated on the said base material sheet, and the antibacterial deodorizing functional layer was formed, and the deodorizing sheet was manufactured. The thickness of the antibacterial deodorant functional layer is 1 μm.

  Next, a linear low-density polyethylene film (manufactured by Tamapoly Co., Ltd., trade name: SE620A) as a sealant film was dry-laminated on the surface of the antibacterial deodorant functional layer of the deodorant sheet to produce a laminate for a packaging bag.

(Comparative Example 1-1)
In this example, zeolite is used instead of fine cellulose fibers. Instead of applying a coating solution in which zeolite was dispersed in water, the zeolite and the thermoplastic resin were put into a melt extrusion molding machine and melt extrusion molded.

  That is, zeolite was kneaded with linear low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name: LC600A) and melt-extruded to produce a sheet-like antibacterial deodorant functional layer. The blending amount of zeolite is 5% by weight. The thickness of the sheet-like antibacterial deodorant functional layer is 50 μm. And this sheet-like antibacterial deodorizing functional layer was adhere | attached on the base material sheet, and the deodorizing sheet was manufactured. As described above, the base sheet is a multilayer transparent sheet (trade name: GL-AE, thickness: 12 μm) manufactured by Toppan Printing Co., Ltd.

(Comparative Example 1-2)
In this example, a material having an antibacterial deodorizing function was not used.

  That is, a linear low density polyethylene (manufactured by Tamapoly Co., Ltd., trade name: SE620A) was dry-laminated on a multilayer transparent sheet (trade name: GL-AE) manufactured by Toppan Printing Co., Ltd. to obtain a sheet of Comparative Example 1-2.

(Evaluation)
Using the sheets of Example 1, Comparative Example 1-1, and Comparative Example 1-2, a 100 × 200 mm three-side sealed bag was made. The bag was sealed with 100 ml of air and then sterilized by irradiation with 10 KGy of γ rays from the outside of the bag.

  The γ-ray sterilized three-side sealed bag was stored at 20 ° C. for one week and then opened to confirm the presence or absence of odor inside the three-side sealed bag. Those with a bad odor were evaluated as “×”, and those without a bad odor were evaluated as “◯”.

  The results are shown in Table 1 together with the transparency of each sheet. Regarding transparency, a transparent sheet was evaluated as “◯”, and an opaque sheet was evaluated as “×”.

  From this result, it is confirmed that although the odor sterilization occurs inside the packaging bag by γ-ray sterilization, the packaging bag using the antibacterial deodorizing sheet of the present invention can adsorb the odorous substance that causes this odor and prevent the odor. did it. Moreover, this packaging bag is transparent, unlike the packaging bag using zeolite, and the inside of the bag can be confirmed from the outside. Moreover, since it can be manufactured by a conventional coater, even a small lot can be easily manufactured.

<Example of the second group>
An example of the second group is an example in which a non-sized paperboard (basis weight 350 g / m ² ) is used as a base sheet.

(Example 2)
A coating solution in which fine cellulose fibers were dispersed in water was produced in the same manner as in Example 1. The board was immersed in this coating solution by dipping and squeezing, and then dried in an oven to produce an antibacterial deodorant sheet. The application amount is 10 g / m ² .

(Comparative Example 2-1)
In this example, the copper ion-supporting pulp is made into a sheet without making it finer.

That is, copper ion-supporting pulp (manufactured by Kojin Co., Ltd., trade name: Clean Sky) was mixed with pulp to produce card paper (basis weight 350 g / m ² ). The odor sheet was used. In addition, the content rate of a copper ion carrying | support pulp is 5 weight%.

(Comparative Example 2-2)
In this example, general card paper (basis weight 350 g / m ² ) not containing copper ion-supporting pulp is used.

(Evaluation)
Using each sheet of Example 2, Comparative Example 2-1, and Comparative Example 2-2, a carton with a lid of a 100 × 100 × 50 mm insertion method was produced.

  And it accommodated in 10 pieces of Shumai cooked in this carton, further sealed in a plastic container, stored at 20 ° C. for 24 hours, and then opened to confirm the presence or absence of an odor inside the plastic container. Those with a bad odor were evaluated as “×”, and those without a bad odor were evaluated as “◯”.

  The results are shown in Table 1. In addition, Table 1 also shows whether or not each sheet of a small lot can be easily manufactured (whether or not small lots can be handled). Regarding small lot handling, “◯” was evaluated when a small lot could be easily manufactured, and “X” was evaluated when it was difficult to manufacture a small lot sheet.

  From this result, although the cooked shumai produces a strange odor inside the plastic container, when the antibacterial deodorant sheet of the present invention is used, the odor substance that causes this strange odor can be adsorbed and the odor can be prevented. It could be confirmed. In addition, this antibacterial deodorant sheet can be manufactured by the dipping and squeeze method, unlike the deodorant sheet using copper ion-carrying pulp that is not refined, so that even a small lot can be easily manufactured. Is possible.

1: Antibacterial deodorant sheet 11: Base sheet 12: Antibacterial deodorant functional layer

Claims (4)

Refining the fiber carrying the metal ions to produce a fine fiber having a length of 10 μm or less;
Dissolving or dispersing the fine fibers in a solvent and coating the substrate sheet;
A method for producing an antibacterial deodorant sheet, comprising:   The method for producing an antibacterial deodorant sheet according to claim 1, wherein the fine fiber is a cellulose fiber.   The method for producing an antibacterial deodorant sheet according to claim 1 or 2, wherein the metal ions are copper ions. A deodorizing sheet having a base sheet and a deodorizing functional layer,
An antibacterial deodorizing sheet, wherein the deodorizing functional layer is composed of fine fibers carrying metal ions, and the fine fibers are fine fibers having a length of 10 μm or less.