JP2022188889A - Method for manufacturing antibacterial agent-containing sheet and antibacterial agent-containing sheet - Google Patents

Abstract

To provide a manufacturing method that is difficult to break when manufacturing an antimicrobial agent-containing sheet from a single-layer base paper sheet with a small basis weight, in addition, to provide the antimicrobial agent-containing sheet suitable for use in restaurants, while showing sufficient antimicrobial effect.SOLUTION: An antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment manufactures a paper napkin 10B from a single-layer base paper sheet 10A having a thickness of 400 to 1,100 micrometers and a basis weight of 12 g or more and 20 g or less per square meter. The antibacterial agent-containing sheet manufacturing apparatus 1 has two spray nozzles 32, and sprays an antibacterial agent 36 on both sides of the base-paper sheet 10A sequentially. The antibacterial agent contains benzalkonium chloride as a main component, and the content of the benzalkonium chloride is 0.005 wt.% or more to 0.0200 wt.% or less based on the weight of the base paper sheet.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method for producing an antibacterial agent-containing sheet and an antibacterial agent-containing sheet.

As one of the infection prevention measures for infectious diseases, sterilization and eradication of bacteria, viruses, etc. (hereinafter referred to as "viruses, etc.") attached to fingers are mentioned. Methods for removing viruses and the like attached to fingers include methods using wet tissues, wet towels, etc., in addition to methods involving hand washing. Especially in coffee shops, restaurants, and other places where food and drink are served, it is preferred to use sanitizers and wet wipes containing antibacterial agents that can easily sanitize hands and fingers.

Various wet wipes and the like containing disinfectants and antibacterial agents have been disclosed.
For example, Patent Document 1 discloses a method for producing wet tissues containing a cationic antibacterial agent such as benzalkonium chloride as an antibacterial agent.
Further, Patent Literature 2 discloses a thin paper having a cationic antibacterial agent.
Similarly, Patent Document 3 discloses an antibacterial paper containing a cationic antibacterial agent such as a benzalkonium salt, and Patent Document 4 discloses an antibacterial paper containing a benzalkonium salt as an antibacterial agent. .
Furthermore, Patent Literature 5 describes a water-decomposable sheet containing a disinfectant.

JP-A-2000-197578 Japanese Patent No. 6496576 U.S. Patent Application Publication No. 2012/0301536 JP 2020-172735 A Japanese Patent No. 5959695

However, wet wipes and hand towels are bulky, and there is a problem that they take up a lot of space when they are always stocked in restaurants and the like. In addition, there is a problem that the cost is high because it is individually packaged to keep it moist until just before use.

Use of paper napkins is a convenient way to remove dirt from fingers. However, it is often difficult to apply antimicrobial agents to thin, low basis weight sheets such as paper napkins. For example, when an aqueous solution containing an antibacterial agent is sprayed onto a base-paper sheet, the moisture lowers the tensile strength of the paper, making the base-paper sheet more likely to break during the manufacturing process.

On the other hand, a method of manufacturing a plurality of paper napkins cut to the required size and then immersing them all together in a liquid antibacterial agent is conceivable, but in this case a large amount of the antibacterial agent solution is required. Furthermore, when a paper napkin is soaked with a large amount of water, there is also the problem that the individual sheets stick to each other and adhere to each other, making it difficult to peel off.

Furthermore, when the antibacterial agent is applied to paper napkins and the like used in restaurants and the like, the amount of the antibacterial agent is preferably as small as possible. This is to prevent the antibacterial agent from being taken into the body through the mouth through the hands and fingers, since the antibacterial agent can also affect the human body. However, if the amount of the antibacterial agent is too small, the antibacterial action cannot be obtained in the first place, so it is extremely important to adjust the application amount appropriately.

The problem to be solved by the present invention is that, in the process of producing an antibacterial agent-containing sheet from a single-layer base paper sheet having a small basis weight, the base paper sheet containing water or the like is likely to break. Moreover, it is necessary to provide an antibacterial agent-containing sheet that exhibits a sufficient antibacterial effect while minimizing the amount of the antibacterial agent.

The most important feature of the present invention is that the antibacterial agent is sprayed two or more times on both sides of the base paper sheet. This makes it possible to stably produce antibacterial agent-containing sheets from single-layer base paper sheets that are thin and have a small basis weight.

The present invention has been made in view of the above problems, and employs the following means.
(1) The invention of claim 1 is a method for producing an antibacterial agent-containing sheet, wherein a pulp-containing base paper sheet having a basis weight of 12 g or more and 20 g or less per square meter and composed of a single layer is used as a base paper roll. a first application step of applying an antibacterial agent to one side of the base-paper sheet, a second application step of applying an antibacterial agent to the other side of the base-paper sheet, a warm air dryer or infrared drying A drying step of drying the base paper sheet with a machine, a cutting step of cutting the base paper sheet into a predetermined size, and the antibacterial agent containing a quaternary ammonium salt compound as a main component. A method for manufacturing an agent-containing sheet is provided.
(2) The invention of claim 2 is characterized in that the content of the quaternary ammonium salt compound is 0.0005% by weight or more and 0.0200% by weight or less with respect to the weight of the base paper sheet. A method for producing an antibacterial agent-containing sheet according to claim 1 is provided.
In this case, by adjusting the concentration of the antibacterial agent to an extremely low concentration, it is possible to stably manufacture antibacterial agent-containing sheets with sufficient antibacterial action while ensuring the safety necessary for disinfecting hands and fingers. Become.
(3) The invention of claim 3 provides the method for producing an antibacterial agent-containing sheet according to claim 1 or 2, wherein the quaternary ammonium salt compound is benzalkonium chloride. do.
In this case, the use of benzalkonium chloride, which has high antibacterial performance even in a small amount, improves the antibacterial performance. In addition, since the amount of the antibacterial agent to be applied is small, breakage of the base paper sheet during the manufacturing process can be easily suppressed.
(4) The invention according to claim 4 comprises an embossing step of embossing the base paper sheet after the feeding step and before the first coating step, and the first coating step. 4. The impregnation step of impregnating the base paper sheet with the antibacterial agent by a guide roll after and before the second coating step according to any one of claims 1 to 3. A method for producing the antibacterial agent-containing sheet according to item 1 is provided.
In this case, the embossing step is provided before the step of applying the antibacterial agent, thereby suppressing adhesion of the antibacterial agent to the embossing roll. In addition, embossing before the antibacterial agent coating process suppresses breakage of the base paper sheet compared to the case where the embossing process is performed before the antibacterial agent coating process. This is because if the base-paper sheet contains moisture due to the antibacterial agent coating process, the base-paper sheet is likely to break.
Further, after the first coating step and before the second coating step, an impregnation step of impregnating the base paper sheet with the antibacterial agent by an induction roll is provided so that the antibacterial agent is applied to the induction roll. Since the base-paper sheet is impregnated by being pressed by the liquid, and the second coating step is performed after the base-paper sheet has been blended, the base-paper sheet is less likely to break.
(5) The antibacterial agent according to claim 4, wherein in the impregnation step, the angle at which the base paper sheet is bent by the guide roll is 90 degrees or more and 120 degrees or less. A method for manufacturing a containing sheet is provided.
In this case, since the surface of the base-paper sheet coated with the antibacterial agent is pressed by the guide roll, the antibacterial agent easily impregnates the base-paper sheet.
(6) The invention of claim 6 is an antibacterial agent-containing sheet consisting of a single layer, wherein the antibacterial agent-containing sheet is a pulp-containing base paper sheet impregnated with an antibacterial agent in the vicinity of both surfaces of the pulp-containing base paper sheet. The basis weight of the base-paper sheet is 12 g or more and 20 g or less per square meter, the thickness of the pulp-containing base-paper sheet is 400 micrometers or more and 1100 micrometers or less, the antibacterial agent contains benzalkonium chloride as a main component, The content of the benzalkonium chloride is 0.0005% by weight or more and 0.0200% by weight or less with respect to the weight of the base paper sheet.
(7) The invention according to claim 7 provides the antibacterial agent-containing sheet according to claim 6, characterized in that the water content is 20% by weight or less with respect to the weight of the entire antibacterial agent-containing sheet. do.
In this case, sticking between the sheets is suppressed, and the sheets are easily peeled off.
(8) The antibacterial agent-containing sheet according to claim 6 or 7, wherein the antibacterial agent-containing sheet is a C-folded paper napkin for hand disinfection. I will provide a.
In this case, since the concentration of the antibacterial agent is appropriately adjusted, the antibacterial agent-containing sheet has a sufficient amount of antibacterial agent for disinfecting the hands and fingers and does not affect the human body.

The method for producing an antibacterial agent-containing paper napkin of the present invention has the advantage that the antibacterial agent is sprayed in two or more steps, so even if the base paper sheet is thin and has a small basis weight, the base paper sheet is not broken during the production process. There is

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the antibacterial agent containing sheet|seat manufacturing apparatus 1 of this embodiment. It is the figure which showed the antibacterial agent containing sheet|seat manufacturing apparatus 1 which concerns on a modification. It is the figure which showed the antibacterial agent containing sheet|seat manufacturing apparatus 1 which concerns on a modification.

An embodiment of the present invention will be described based on the drawings. In each of the following embodiments, the same reference numerals may be given to the same or corresponding parts, and description thereof may be omitted as appropriate. Also, the drawings used below are used to describe this embodiment, and may differ from actual dimensions.

In the case of a cylindrical roll such as a raw fabric roll, on a plane perpendicular to the central axis, the direction away from the central axis is referred to as the radial direction, and the direction along the outer circumference of the cylinder is referred to as the circumferential direction.

The white arrows in the drawing indicate the spraying direction of the antibacterial agent 36, and the white dotted arrows indicate the blowing direction of hot air. Arrows other than these indicate the direction in which the base-paper sheet 10A flows.

(Overview of embodiment)
An overview of this embodiment will be described with reference to FIG. The base paper sheet 10A is a lightweight and thin single-layer sheet having a thickness of 400 to 1100 micrometers and a basis weight of 12 g or more and 20 g or less per square meter. The antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment produces an antibacterial agent-containing sheet from the base paper sheet 10A.

The antibacterial agent-containing sheet manufacturing apparatus 1 is equipped with two spray nozzles 32 for spraying the antibacterial agent 36 on both sides of the base paper sheet 10A. The antibacterial agent contains benzalkonium chloride as a main component. In the paper napkin 10B, the content of the benzalkonium chloride is adjusted to be 0.005% by weight or more and 0.0200% by weight or less (hereinafter referred to as "%") with respect to the weight of the base paper sheet. be.

(Details of embodiment)
As one embodiment of the method for manufacturing the sheet containing the antibacterial agent, a method for manufacturing the paper napkin 10B containing the antibacterial agent will be described. An antibacterial agent-containing sheet manufacturing apparatus 1 is used for manufacturing the paper napkin of the present embodiment. Details will be described below.

<Antibacterial agent-containing sheet manufacturing apparatus 1>
As shown in FIG. 1, the antibacterial agent-containing sheet manufacturing apparatus 1 in the present embodiment processes a base paper sheet 10A sent out from a base paper roll 10, and in addition to rolls 20 such as a double-sided embossing roll 24, a coating machine 30, a dryer 40, a paper folding machine 50 and a paper cutting machine 60. Each of these will be described below.

<Original fabric roll 10>
The raw roll 10 is a roll that supplies the raw paper sheet 10A. In this embodiment, the raw fabric roll 10 is a so-called free roll that does not have a rotational driving force. Since known methods can be used for the processes (beating process and papermaking process) up to manufacturing the raw fabric roll 10, the description thereof will be omitted.
Note that the raw fabric roll 10 is also a type of roll, but for the sake of convenience, it will be described separately from the roll 20 described later.

<Base paper sheet 10A>
The base-paper sheet 10A is a single-layer sheet sent out from the base-paper roll 10 . By "single-layer" is meant that the sheet is not laminated in two or more layers, eg, is not plied.
The base-paper sheet 10A is not discontinuously separated from the base-paper roll 10, but is sent out from the base-paper roll 10 for the sake of convenience.

The base paper sheet 10A contains pulp as a raw material. There are no particular restrictions on the pulp used as the raw material, and those made from broadleaf tree fibers (hardwood pulp), those made from softwood fibers (softwood pulp), or mixtures thereof can be used as appropriate. Moreover, the pulp used as a raw material may be recycled from used paper. Hereinafter, the "pulp-containing base-paper sheet" is simply referred to as "base-paper sheet" unless it is necessary to distinguish between them.

The percentage of pulp in the raw material of the base paper sheet 10A in this embodiment is 100%. However, as fibers other than pulp fibers, rayon fibers, synthetic fibers, and the like may be blended. Furthermore, the raw material pulp may contain additives such as a flocculant, an adhesive, and a release agent.

The basis weight of the base paper sheet 10A is preferably 13 to 20 g per square meter, more preferably 14 to 16 g, and most preferably 14 to 15 g per square meter.
If the basis weight of the base-paper sheet 10A is less than 13 g per square meter, the base-paper sheet 10A is likely to break during the manufacturing process.
On the other hand, if the basis weight of the base paper sheet 10A exceeds 20 g per square meter, the antibacterial agent-containing sheet becomes bulky, which is inconvenient for storage and transportation. When the basis weight of the base-paper sheet 10A is in the range of 14 g to 15 g per square meter, the bulkiness of the sheet can be suppressed and the production stability can be enhanced.
The basis weight can be evaluated by a paper and paperboard--measurement method for basis weight based on JIS P8124:2011.

Moreover, the thickness of the base-paper sheet 10A is preferably 400 micrometers or more and 1100 micrometers or less. If the thickness of the base-paper sheet 10A is less than 400 micrometers, it tends to break during the manufacturing process. On the other hand, if the thickness of the base-paper sheet 10A is 1100 micrometers or more, it becomes bulky, which is inconvenient for storage and transportation. The thickness referred to here refers to the thickness of a single layer of the base-paper sheet 10A.

<Roll 20>
The antibacterial agent-containing sheet manufacturing apparatus 1 of this embodiment includes rolls for conveying the base-paper sheet 10A. In addition to guide rolls 22 for guiding the flow direction of the sheet, double-sided embossing rolls 24 for embossing the base paper sheet 10A are provided.

<Induction roll 22>
The guide roll 22 is a metal roll for changing the direction of flow of the base-paper sheet 10A. Commercially available products can be used as appropriate, but those having high smoothness, durability and running stability are preferred.
Note that the guide roll 22 of the present embodiment is a so-called free roll that does not have a rotational driving force, but a roll that is provided with a motor or the like and has a rotational driving force may be used.
The direction of flow of the base-paper sheet 10A can be freely designed by the guide roll 22. As shown in FIG. As a result, it is possible to reduce the size of the manufacturing apparatus.

Furthermore, after the antibacterial agent 36, which will be described later, is sprayed, the base-paper sheet 10A is sufficiently impregnated with the antibacterial agent 36 by pressing the surface of the base-paper sheet 10A coated with the antibacterial agent 36 against the guide roll 22.
That is, after the antibacterial agent 36 is applied, the base-paper sheet 10A is passed through the guide roll 22 at least once so that the antibacterial agent 36 is sufficiently impregnated into the base-paper sheet 10A. As a result, even if the base-paper sheet 10A comes into contact with other materials in subsequent processes, the antibacterial agent 36 does not come off. For example, even if the paper napkins 10B are laminated, the antibacterial agent 36 does not adhere to the other paper napkins 10B.
From the above point of view, it is preferable to pass the guide roll 22 after applying the antibacterial agent 36 and before entering the drying process.

<Double-sided embossing roll 24>
The double-sided embossing roll 24 is a metal roll for imprinting the base paper sheet 10A. Double-sided embossing roll 24 comprises embossing roll 242 and paper roll 244 . Embossing is performed by pressing the base paper sheet 10A with the embossing roll 242 and the paper roll 244 .

The paper roll 244 is provided with rotational driving force by a motor. Therefore, the base-paper sheet 10A is nipped between the embossing roll 242 and the paper roll 244, and further tensioned by the rotation of the press roll 28, and sent out from the base-paper roll 10A.

The paper napkin 10B manufactured by the antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment has decoration by embossing. By embossing, it is possible to impart a design to the paper napkin 10B. In addition, embossing has the effect of reducing the contact area between the paper napkins 10B to make them easier to take out, and also gives the paper napkins 10B a non-slip effect and an effect of making them less likely to break.

<Press roll 26>
The press roll 26 is a metal roll arranged between a paper folding machine 50 and a paper cutting machine 60, which will be described later. As shown in FIG. 1, the press roll 26 comprises a pair of upper and lower rolls. The upper roll of the press rolls 26 is a so-called free roll that is not provided with driving force, and the lower roll is provided with rotational driving force by a motor. The motor in this embodiment is a VS motor.
The base-paper sheet 10A nipped between the press rolls 26 is tensioned by the rotation of the press rolls 28 and sent out from the base-paper roll 10A.

<Coating machine 30>
The applicator 30 is a device that applies an antibacterial agent 36 to the base paper sheet 10A. In this embodiment, the applicator 30 is a sprayer that applies the antimicrobial agent 36 by spraying. The applicator 30 of this embodiment includes a spray nozzle 32, a storage tank 34, and a pump (not shown). The antibacterial agent 36 is pumped from the storage tank 34 and sprayed onto the base paper sheet 10A through the spray nozzle 32 .

<Spray nozzle 32>
A spray nozzle 32 is a nozzle for spraying an antibacterial agent 36 . As for the nozzle, a commercially available one is appropriately used as long as it can spray the antibacterial agent 36 . Examples of such nozzles include a flat type nozzle capable of ejecting liquid in a fan-shaped flat shape, a cone type nozzle capable of ejecting liquid conically, and a slit type nozzle having a slit in the opening. In addition to the one-fluid type nozzle, a two-fluid type nozzle may be used.
Examples of such a spray nozzle include an automatic spray gun (Lumina (registered trademark) series) manufactured by Fuso Seiko Co., Ltd.
As shown in FIG. 1, the antibacterial agent-containing sheet manufacturing apparatus 1 of this embodiment includes a first spray nozzle 322 and a second spray nozzle 324. Each nozzle may be of the same type or may be of a different type. It may be a type.

The antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment only needs to have two parts to be sprayed, and two applicators 30 having one spray nozzle 32 may be prepared, or one nozzle of the applicator 30 The part may be branched to form two spray nozzles 32 .

<First spray nozzle 322>
The first spray nozzle 322 is a nozzle that sprays the antibacterial agent 36 onto one surface of the base-paper sheet 10A.
FIG. 1 shows an arrangement state of the first spray nozzles 322 in this embodiment. In the vicinity of the first spray nozzle 322, the base-paper sheet 10A flows from the ground in a substantially parallel direction from right to left, and the first spray nozzle 322 is arranged above it. The ejection port of the first spray nozzle 322 faces one side of the base-paper sheet 10A.

<Second Spray Nozzle 324>
The second spray nozzle 324 is a nozzle for spraying the antibacterial agent 36 onto the other surface of the base-paper sheet 10A.
FIG. 1 shows the arrangement of the second spray nozzles 324 in this embodiment. In the vicinity of the second spray nozzle 324, the base-paper sheet 10A flows from bottom to top in a substantially vertical direction, and the second spray nozzle 324 is arranged on its side surface (left side in the drawing). The ejection port of the second spray nozzle 324 faces the other side of the base-paper sheet 10A.

By adding the step of running the base paper sheet 10A in a substantially vertical direction and spraying the antibacterial agent 36 from the side, it is possible to reduce the size of the manufacturing apparatus. Alternatively, after applying the antibacterial agent 36 to one surface, the flow direction of the base-paper sheet 10A is changed via the guide roll 22, and the antibacterial agent 36 is sprayed laterally on the base-paper sheet 10A flowing in a substantially vertical direction. , the base-paper sheet 10A is less likely to break.

This is probably because the distance between the sprays from the first spray nozzle 322 and the spray from the second spray nozzle 324 is large, and the antibacterial agent 36 penetrates into the base-paper sheet 10A between them.

The angle formed by the base-paper sheet 10A before the flow direction is changed by the guide roll 22 and the base-paper sheet 10A after the change is the angle formed by one side of the base-paper sheet 10A and the angle formed by the other side. The smaller angle (hereinafter referred to as "the angle at which the base-paper sheet 10A is bent by the guide roll 22") is preferably 90 degrees or more and 120 degrees or less. In this case, since the antibacterial agent-coated surface of the base-paper sheet 10A is pressed by the guide roll 22, the antibacterial agent easily impregnates the base-paper sheet.
If this angle exceeds 120 degrees, the pressing force is insufficient. On the other hand, if this angle is less than 90 degrees, the moisture-absorbed base paper sheet may break due to tension.

<Storage tank 34>
The storage tank 34 is a tank that stores the antibacterial agent 36 (not shown). Although the storage tank 34 in this embodiment has only a tank for the antibacterial agent 36, two or more tanks may be used when two or more kinds of antibacterial agents are used.
A liquid intake port (not shown) connected to a pump is inserted into the storage tank 34, and the antibacterial agent is transferred to the spray nozzle 32 side by driving the pump.

<Antibacterial agent 36>
Antimicrobial agent 36 is a compound having antimicrobial activity. The antibacterial agent 36 contains a quaternary ammonium salt compound as a main component.
Examples of such quaternary ammonium salt compounds having antibacterial properties include benzalkonium chloride, benzethonium chloride, methylbenzethonium chloride, cetylpyridinium chloride, cetrimonium chloride, dophanium chloride, tetraethylammonium bromide, didecyldimethylammonium chloride, and odorants. and modified domiphene. In addition, these quaternary ammonium salts may be anion-exchanged as long as they have antibacterial properties.
Among these, benzalkonium chloride or benzethonium chloride is preferred, and benzalkonium chloride, which exhibits high antibacterial performance, is most preferred.

In addition, "contained as a main component" means that when two or more antibacterial agents are contained, the weight ratio of the quaternary ammonium salt compound antibacterial agent is the highest among the two or more antibacterial agents. When the antibacterial agent is only a single quaternary ammonium salt compound, the quaternary ammonium salt compound is assumed to be the main component.

The antibacterial agent 36 is used after being diluted with water. Antibacterial agent-containing sheets are used, for example, as paper napkins in restaurants, so the concentration of the antibacterial agent 36 is adjusted to be extremely low. For example, in the present embodiment, the concentration of the antibacterial agent 36 after dilution is adjusted to 0.05% by weight or less with respect to the entire aqueous antibacterial agent solution.

In addition, hereinafter, when emphasizing that the antibacterial agent 36 is diluted with water, it is described as "antibacterial agent aqueous solution". If there is no particular need to emphasize, the term "antibacterial agent" will be used without distinction even if it is an aqueous solution of an antibacterial agent.

In addition to the antibacterial component, the antibacterial agent aqueous solution diluted with water may contain a calcium agent to make the amount of bleaching powder equal to that of tap water. Examples of calcium agents include calcium hypochlorite, calcium hydroxide, and calcium chloride. In this case, the amount of calcium is adjusted between 0.001% and 0.010% relative to water. In this embodiment, 40 g of calcium hypochlorite is added to 2000 kg of water.

In this embodiment, antimicrobial agent 36 is benzalkonium chloride. By including benzalkonium chloride, which has a high antibacterial effect, sufficient bactericidal performance can be obtained even with a small amount of addition. Further, in this case, since the amount of water to be sprayed can be suppressed, there is an advantage of reducing breakage of paper.

The antibacterial agent 36 may contain an antibacterial component in addition to the quaternary ammonium salt compound described above. Examples of such antibacterial components include nonionic antibacterial agents, ionic antibacterial agents, and alcohols such as ethanol.

Furthermore, the antibacterial agent 36 may contain an arbitrary component in addition to the antibacterial component. Optional components include, for example, chlorine agents, surfactants, perfumes, and the like.

<Dryer 40>
The dryer 40 is a device that removes unnecessary volatile components from the base-paper sheet 10A coated with the antibacterial agent aqueous solution and dries the base-paper sheet 10A. In this embodiment, the dryer is a warm air dryer.
A hot air outlet 42 of the dryer 40 is provided with a discharge temperature sensor (not shown).
When referring to the temperature of the dryer 40 hereinafter, it means the temperature at the hot air outlet 42 . Therefore, the drying temperature decreases as the base-paper sheet 10A moves away from the hot air outlet 42 of the dryer.
In this embodiment, the temperature of the dryer 40 is preferably 125 degrees or more and 300 degrees or less. In this case, wrinkles in the paper are suppressed.

In addition to the drying machine 40, drying may be performed by warming the roll with which the base-paper sheet 10A contacts after the antibacterial agent 36 is sprayed. For example, in FIG. 1, the guide roll 22f or the guide roll 22g may be warmed to dry the base paper sheet 10A. In this case, wrinkles in the paper are further suppressed. From the viewpoint of reducing wrinkles in the paper, it is more preferable to warm both the guide roll 22f and the guide roll 22g for drying.

The dryer 40 is not limited to a warm air dryer, and any dryer that evaporates unnecessary volatile components contained in the antibacterial agent 36 may be used. Examples of such a dryer include an infrared dryer that emits infrared rays.
A hot air dryer is more preferable in terms of drying efficiency because it can remove components volatilized by wind power from the vicinity of the base paper sheet 10A. An infrared dryer is preferable in that no physical force is applied to the base-paper sheet 10A.
These methods have higher drying efficiency than the method of warming the induction roll 22 and are preferable.
In addition, for example, a drying method using a large drum such as a Yankee dryer may cause unevenness due to volatile components, but hot air drying or infrared drying is preferable because such problems do not occur.

<Paper folder 50>
The paper folding machine 50 is a device for folding the base paper sheet 10A into an arbitrary shape. As the paper folding machine 50, a commercially available paper folding machine suitable for the manufacturing speed of this embodiment can be used as appropriate. In this embodiment, the paper folding machine 50 processes the base paper sheet into a C-fold.
The paper napkins manufactured by the antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment are stored in a folded state, and are unfolded as necessary when used.

<Cutter 60>
The cutting machine 60 is a device that cuts the base paper sheet 10A to an arbitrary length. As the cutting machine 60, a commercially available cutting machine suitable for the manufacturing speed of this embodiment can be used as appropriate.
The cut base paper sheet 10A is packed in a wrapping film or the like, stored, and shipped.

<Paper napkin 10B>
The paper napkin 10B is an individual sheet finally obtained by cutting the base paper sheet 10A with the cutting machine 60, and is expressed in this way for convenience. The paper napkin 10B is used alone, and is used for disinfecting hands and fingers, for example, in restaurants.
A plurality of paper napkins 10B are packed as one packing unit. For example, in the present embodiment, the paper napkins 10B are packed in packaging films in units of 100 sheets.

Here, the amount of the quaternary ammonium salt contained in the antibacterial agent-containing sheet will be explained. In the following explanation of the weight ratio, "with respect to the weight of the base-paper sheet (10A)" means "with respect to the weight of the base-paper sheet (10A) in a dry state before the application of the antibacterial agent".

The amount of the quaternary ammonium salt contained in the antibacterial agent-containing sheet is preferably 0.0005% by weight or more, more preferably 0.0010% by weight or more, and 0.0050% by weight with respect to the weight of the base paper sheet 10A. % or more is most preferable. This is because the antibacterial performance improves as the amount of the antibacterial agent increases.
On the other hand, if the amount of the quaternary ammonium salt contained in the antibacterial agent-containing sheet is less than 0.0001% by weight with respect to the weight of the base paper sheet 10A, the effect as an antibacterial agent is insufficient, which is not preferable.

The amount of the quaternary ammonium salt contained in the antibacterial agent-containing sheet is preferably 0.0400% by weight or less, preferably 0.0200% by weight or less, and 0.0100% by weight or less with respect to the weight of the base paper sheet 10A. is most preferred.
For example, like paper napkins, sheets containing antibacterial agents are used to disinfect hands and fingers. is preferably less.

If the amount of the quaternary ammonium salt contained in the antibacterial agent-containing sheet exceeds 0.0400% by weight with respect to the weight of the base paper sheet 10A, the feeling of use of the antibacterial agent-containing sheet deteriorates. For example, in the case of benzalkonium chloride, the odor peculiar to benzalkonium chloride becomes strong, which is not preferable.
On the other hand, when the same weight ratio exceeds 0.0400% by weight, the antibacterial agent-containing sheets tend to stick to each other. Considering the result of sensory evaluation such as the feeling of use, the same weight ratio is preferably 0.0200% by weight or less.

As a method for measuring the content of the antibacterial agent contained in the antibacterial agent-containing sheet such as the paper napkin 10B, a known measurement method is appropriately used. For example, the paper napkin 10B coated with the antibacterial agent is placed in a petri dish, a certain amount of a solvent such as water or acetonitrile is added thereto, shaken, and then left to stand for a while so that the solvent does not volatilize. The content of the antibacterial agent can be calculated by analyzing the antibacterial agent component eluted into the solvent by gas chromatography (GC-MS) or liquid chromatography (LC-MS).
As such a measuring device, for example, a gas chromatograph GCMS-TQ series manufactured by Shimadzu Corporation can be used.

Also, the amount of moisture contained in the antibacterial agent-containing sheet such as the paper napkin 10B is preferably 20% by weight or less, more preferably 15% by weight or less, and most preferably 10% by weight or less, relative to the weight of the entire antibacterial agent-containing sheet.
If the moisture content is 20% by weight or less relative to the entire antibacterial agent-containing sheet, the antibacterial agent-containing sheets will not stick to each other, and the individual sheets will easily peel off.
The content (content ratio) is obtained by ((weight of antibacterial agent-containing sheet−weight of dry base paper sheet)÷weight of antibacterial agent-containing sheet×100).

In this embodiment, since the antibacterial agent aqueous solution is sprayed and used, the antibacterial agent-containing sheet immediately after production contains moisture. For example, the antibacterial agent-containing sheet immediately after production contains 1% by weight or more of moisture with respect to the weight of the entire antibacterial agent-containing sheet.

<Manufacturing process>
The manufacturing process of the paper napkin 10B (hereinafter simply referred to as "paper napkin manufacturing process") by the antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment will be described below.
The paper napkin manufacturing process includes, in order, a feeding process, an embossing process, an antibacterial agent coating process, a drying process, a paper folding process, and a cutting process.

The antibacterial agent 36 is sequentially applied to both surfaces of the base-paper sheet 10A sent out from the raw roll 10 and dried to manufacture the paper napkin 10B with the antibacterial agent 36 adhered to both surfaces.
The paper napkin manufacturing process according to the present embodiment is characterized by manufacturing an antibacterial agent-containing paper napkin without breaking single-layer thin paper having a small basis weight. The paper napkin manufacturing process of the present embodiment can process single-layer thin paper as it is, and does not require, for example, a ply process to make the paper into two layers.

<Sending out process>
The sending step is a step of sending out the pulp-containing base-paper sheet 10 A composed of a single layer from the raw fabric roll 10 . In this embodiment, the original fabric roll 10 is a free roll. Therefore, the base-paper sheet 10A is sent out by the tension generated from the roll having the rotational driving force in the subsequent steps.

<Embossing process>
In the embossing process, the double-sided embossing roll 24 is used to emboss the base-paper sheet 10A delivered from the raw roll 10 . By embossing, the base-paper sheet 10A is provided with unevenness to enhance the design. In addition, there is an advantage that the contact area increases when it comes into contact with the object to be wiped due to the unevenness produced by the embossing.

In addition, compared to creping, which gives a design such as wrinkles to the base paper sheet 10, decoration by embossing has the advantage that the same design can be given repeatedly. Further, since the base-paper sheet 10A of the present embodiment is thin and easily broken, embossing, which enables decoration only by pressing, is more preferable than creping, which requires adhesion and peeling, for example.

<Antibacterial agent application process>
In the antibacterial agent application process, the antibacterial agent 36 is uniformly applied to the base paper sheet 10A that has undergone the embossing process. One side of the base-paper sheet 10A is coated with the antibacterial agent 36 in the first coating step, and the other side of the base-paper sheet 10A is coated with the antibacterial agent 36 in the subsequent second coating step.

The term "uniformly apply" means uniform application by a mechanically controlled method. This is a term used to distinguish it from manual application methods such as sprayers.
Therefore, as long as it is mechanically controlled, the distribution of the amount of spray agent 36 applied may have an inclination within the same plane of the base-paper sheet 10A.

(First coating step)
In the present embodiment, the first application step is the step of spraying the antibacterial agent 36 onto one side of the base-paper sheet 10A using the first spray nozzle 322 .
The antibacterial agent 36 is sprayed from above the base-paper sheet 10A by a first spray nozzle 322 arranged above the base-paper sheet 10A.

(Second coating step)
In this embodiment, the second application step is a step of spraying the antibacterial agent 36 onto the other surface of the base-paper sheet 10A using the second spray nozzle 324. FIG.
As shown in FIG. 1, the antibacterial agent 36 is sprayed from the side surface (left side in FIG. 1) in the flow direction of the base-paper sheet 10A by a second spray nozzle 324 arranged on the lateral side of the base-paper sheet 10A.

By arranging the first spray nozzle 322 on the upper side of the base-paper sheet 10A, it is possible to perform coating using the force of gravity.
Further, by arranging the second spray nozzle 324 on the side surface of the base-paper sheet 10A, there is an advantage that coating can be performed without taking up space in the manufacturing apparatus and that breakage is difficult to occur.
By arranging the first spray nozzles 322 and the second spray nozzles 324 in this way, together with the effect of the roll 22 described above, breakage and meandering of the paper can be suppressed.

If the two spray nozzles (362, 364) face each other across the base paper sheet 10A and spray simultaneously, the paper tends to break. Therefore, it is preferable that the spraying by the first spray nozzle 322 is followed by the spraying by 364 .

In order to spray the antibacterial agent 36 on both sides of the base paper sheet 10A, it is conceivable that the first spray nozzle 322 sprays from above and the second spray nozzle 324 sprays from below. However, if the spray nozzles are arranged below the base-paper sheet 10A, the antibacterial agent 36 that has not adhered to the base-paper sheet 10A may drop due to gravity and contaminate the spray nozzles 324 .
Therefore, after applying the antibacterial agent 36 to one side of the base-paper sheet 10A, the flow direction of the base-paper sheet 10A is changed by the guide roll 22, and the second spray nozzle 324 arranged on the side of the base-paper sheet 10A sprays the other side of the base-paper sheet 10A. Spraying the antibacterial agent 36 is more preferable.

According to the coating method according to this embodiment, the antibacterial agent 36 can be impregnated in the vicinity of the surface of the base-paper sheet 10A.
Here, "impregnating the vicinity of the surface with the antibacterial agent" means that the antibacterial agent is applied most in the vicinity of the surface of the base paper sheet, and the amount of the antibacterial agent decreases from the surface to the inner side in the thickness direction. That is, the amount of the antibacterial agent is slanted along the thickness direction. This is distinguished from the one in which the antibacterial agent is uniformly contained inside the base-paper sheet 1OA.
By impregnating the antibacterial agent in the vicinity of the surface, the antibacterial action can be efficiently obtained even with a small amount of the antibacterial agent.

Here, as shown in FIG. 1, after the first coating step and before the second coating step, an impregnation step is provided for impregnating the base paper sheet with the antibacterial agent using a guide roll. is preferred.
This is because the base-paper sheet 10A is sufficiently impregnated with the antibacterial agent 36 by pressing the surface of the base-paper sheet 10A to which the antibacterial agent 36 is applied by the guide roll 22 .

Taking FIG. 1 as an example, the step of pressing one side of the base paper sheet 10A with the guide roll 22d after the first spraying by the first spray nozzle 322 corresponds to the impregnation step. Similarly, the step of pressing the other surface of the base-paper sheet 10A with the guide roll 22f after the second spraying by the second spray nozzle 324 also corresponds to the impregnation step.

As described above, the angle at which the base-paper sheet 10A is bent by the guide rolls 22 (the guide rolls 22d and 22f) is preferably 90 degrees or more and 120 degrees or less. In this case, the base-paper sheet 10A is pressed more strongly by the guide roll 22, making it easier for the antibacterial agent 36 to impregnate the base-paper sheet 10A.

As shown in FIG. 1, in this embodiment, five guide rolls 22 are arranged between the paper roll 244 and the hot air outlet 42 for the base paper sheet 10A. It is preferable that there are at least three guide rolls 22 between the paper roll 244 and the hot air outlet 42 because the paper does not tear.
By arranging the spray nozzles 32 at two locations and increasing the number of guide rolls 22 through which the base-paper sheet 10A passes, it is possible to disperse the amount of liquid for one unit and the air pressure of the sprayer, thereby preventing tearing of the base-paper sheet 10A. Wrinkles can be suppressed.

<Drying process>
In the drying process, the dryer 40 removes unnecessary volatile components from the base paper sheet 10A coated with the antibacterial agent-containing aqueous solution, and dries the base paper sheet 10A.
The temperature of the hot air in the drying process is preferably 125°C or higher and 300°C or lower. When the temperature is set within this range, it is suitable for removing desired moisture, and wrinkles in the sheet are suppressed.

The amount of the antibacterial agent adhering to the base-paper sheet does not change before and after the drying process. Moreover, the amount of moisture contained in the base paper sheet is almost the same before and after the drying process. Therefore, the antibacterial agent concentration of the antibacterial agent aqueous solution may be replaced with the antibacterial agent concentration after application.

Preferably, the drying step immediately follows the antimicrobial agent application step. This is to prevent the antibacterial agent from adhering to parts of the manufacturing apparatus.

<Paper folding process>
In the paper folding process, the base paper sheet 10A dried in the drying process is folded into a shape suitable for use as a paper napkin. In the paper folding process, the base paper sheet 10A is mechanically folded. "Mechanically" refers to continuous folding using an industrial machine. As described above, a commercially available paper folding machine can be selected as appropriate. The mode of folding is not particularly limited, but C-folding is preferred because it can be processed continuously.

<Cutting process>
The cutting process is a process of cutting the base paper sheet 10A folded in the paper folding process to a predetermined length using the cutting machine 60 . The base-paper sheet 10A is cut in a direction perpendicular to the sheet flow direction.

At this time, the ratio of the paper width to the cut length (cut length) is preferably between 1:1 and 1:2, more preferably between 1.3:1.7. If the ratio of the paper width to the cut length is within this range, the paper napkin does not take up a lot of width when it is set upright, and the feeling of use is improved. In this embodiment, the ratio of paper width to cut length is 1:1.5.
Sheets cut by the cutting process are stacked in a predetermined number of sheets and wrapped with a wrapping film or the like.

<Production volume>
Considering production efficiency, it is preferable that the production amount per minute is large. For example, the production amount per minute is preferably 10 square meters or more. According to the paper napkin production method of the present embodiment, it was possible to stably produce antibacterial agent-containing paper napkins of 15 square meters or more per minute.
If the production amount per minute exceeds 20 square meters, the base-paper sheet 10A is likely to break, so the production amount per minute is preferably 15 square meters or less.

By manufacturing the paper napkin 10B with the antibacterial agent-containing sheet manufacturing apparatus 1 of the present embodiment, the liquid amount of the antibacterial agent 36 and the air pressure of the sprayer can be dispersed, and tearing and wrinkling of the base paper sheet 10A can be suppressed. be able to. By applying the antibacterial agent 36 to both sides of the base-paper sheet 10A, the antibacterial agent 36 can be applied to the entire base-paper sheet 10A.

A paper napkin 10B was produced using the method for producing an antibacterial agent-containing sheet according to the present embodiment, and the antibacterial effect of the obtained paper napkin 10B was evaluated.

(Experimental example 1)
<Manufacturing method of paper napkin 10B>
A paper napkin 10B was manufactured by the antibacterial agent-containing sheet manufacturing apparatus 1 shown in FIG. The original fabric roll 10, the double-sided embossing roll 24, the coater 30, the dryer 40, the paper folding machine 50 and the cutting machine 60 are as described above. After the coating process, mainly the coater 30, the dryer 40, etc. will be specifically described below.

A sprayer equipped with a spray nozzle was used as the applicator 30 . A gravity vessel was used as the storage tank 34 to supply the spray nozzle 32 with the antimicrobial agent 36 . Two Lumina automatic spray guns (ST-5) were used as the applicator 30 . Moreover, the spray pattern of the spray nozzle 32 used flat spray. Air was supplied from the antibacterial agent-containing sheet manufacturing apparatus 1 .

FIG. 1 shows an example of distance relationships between spray nozzles, rolls, and the like. The distance from the first spray nozzle 322 to the base-paper sheet 10A was set to 500 mm, and the distance from the second spray nozzle 324 to the base-paper sheet 10A was set to 280 mm.

Similarly, the distance from the paper roll 244 to the guide roll 22b is 580 mm, the distance from the guide roll 22b to the guide roll 22c is 545 mm, the distance from the guide roll 22c to the guide roll 22d is 482 mm, and the guide roll 22d to the guide roll 22e. is 410 mm, the distance from the guide roll 22e to the guide roll 22f is 830 mm, and the distance from the guide roll 22f to the guide roll 22g is 160 mm.

The angle at which the base-paper sheet 10A is bent by the guide roll 22b (in FIG. 1, the angle formed by the base-paper sheet 10A from the paper roll 244 to the guide roll 22b and the base-paper sheet 10A from the guide roll 22b to the guide roll 22c) is 120 degrees. be.

Similarly, the angle at which the base-paper sheet 10A is bent by the guide roll 22c is 45 degrees, the angle at which the base-paper sheet 10A is bent by the guide roll 22d is 110 degrees, and the angle at which the base-paper sheet 10A is bent by the guide roll 22e is 135 degrees. The angle at which the base-paper sheet 10A is bent by 22f is 90 degrees, and the angle at which the base-paper sheet 10A is bent by the guide roll 22g is 100 degrees.

By appropriately adjusting the distance between the guide rolls 22 and the angle at which the base-paper sheet 10A is bent by the guide rolls 22 and setting the distance and angle as described above, a stable manufacturing method in which breakage is unlikely to occur can be achieved. was able to build.

The guide roll 22d and the guide roll 22f are guide rolls involved in the impregnation process described above. As described above, the angle at which the base-paper sheet 10A is bent by the guide roll 22d is 110 degrees, and the angle at which the base-paper sheet 10A is bent by the guide roll 22f is 90 degrees. As described above, since these corners are in the range of 90 degrees or more and 120 degrees or less, the surface of the base-paper sheet 10A coated with the antibacterial agent 36 is pressed by the guide roll 22, and the antibacterial agent 36 easily impregnates the base-paper sheet 10A.

The temperature of the dryer 40 was set at 255 degrees. After drying, the base paper sheet 10A was C-folded with a folding plate by a folding machine 50 and cut by a cutting machine 60 . 100 paper napkins 10B obtained by cutting were individually wrapped.

As for the specific operation, after the machine was started, the machine speed was increased to 400 shots, and then the air valve was manually opened to start spraying.
When the motor of the antibacterial agent-containing sheet manufacturing apparatus 1 was stopped, the air was stopped and the spraying was stopped.
A paper napkin 10B having the antibacterial agent 36 adhered to both one surface and the other surface was produced through the above-described process by the antibacterial agent-containing sheet manufacturing apparatus 1 .

100 paper napkins 10B to which benzalkonium chloride was adhered as the antibacterial agent 36 were produced by the antibacterial agent-containing sheet production apparatus 1 of the present embodiment. The paper width per sheet of the paper napkin 10B is 162 mm, and the cut size is 243 mm. Also, the thickness of one paper napkin 10B is 550 micrometers. In this embodiment, since 400 sheets (400 shots) were produced per minute, the production volume per minute was 15.75 square meters.

The dry basis weight of the base paper sheet 10A was 14.0 g per square meter. Therefore, the weight of one paper napkin 10B not coated with the antibacterial agent 36 is 0.55 g (55 g per 100 sheets).

In this example, the weight per 100 paper napkins after the step of applying (spraying) the antibacterial agent aqueous solution (concentration of the antibacterial agent: 0.05% by weight) and the drying step was 56 g. That is, the weight per sheet of the paper napkin 10B to which benzalkonium chloride is adhered is 0.56 g.
At this time, the amount of benzalkonium chloride contained in the antibacterial agent aqueous solution (0.01 g) remaining in the one-sheet napkin 10B (0.56 g) is 0.000005 g (0.01 x 0.05% by weight). . That is, the amount of the quaternary ammonium salt contained in the paper napkin 10B at this time is 0.0009% by weight with respect to the weight of the base paper sheet 10A (0.000005g/0.55g x 100 = 0.000909% ).
The results of evaluating the antibacterial performance of the paper napkin 10B thus obtained are shown below.

<Evaluation method>
According to this embodiment, an antibacterial test (quantitative test, fungal liquid absorption method) based on JIS L1902:2002 was performed on textile products. At the time of the test, 0.05% by weight of a surfactant (Tween 80) was added to the test bacteria suspension. Escherichia coli NBRC 3301 (Escherichia coli) and Staphylococcus aureus NBRC 12732 (Staphylococcus aureus) were used as test bacteria.
A bacteriostatic activity value of 2.2 or more was defined as having an antibacterial and deodorant effect (JTETC standard). This test was deemed valid at a proliferation value of 1.0 or higher. The bacteriostatic activity value is the logarithm of the value obtained by dividing the viable count of the standard cloth after culturing for 18 hours by the viable count of the processed cloth after culturing for 18 hours.

In the following, the evaluation was performed by changing the application amount of the antibacterial agent 36 . In the table, the numerical value in the leftmost column is the weight per 100 paper napkins 10B after the antibacterial agent 36 is sprayed and dried. The weight of 100 paper napkins 10B not sprayed with the antibacterial agent 36 is 55 grams.

For example, when the weight of 100 paper napkins after the spraying process of the antibacterial agent 36 and the drying process is 56 g (Table 1 upper table, row with "56 g"), 100 paper napkins The total weight of the contained antibacterial agent 36 and water is 1 g (in the case of one paper napkin, the total weight of the antibacterial agent 36 and water is 0.01 g). Evaluation results are shown.

In Table 1, the antibacterial agent ratio is the amount of the quaternary ammonium salt relative to the weight of the base-paper sheet 10A (weight of the quaternary ammonium salt/weight of the base-paper sheet before antibacterial agent application×100). In addition, those with antibacterial and deodorant effects were evaluated as positive, and those without such effects were evaluated as non-effective.

<Evaluation results>

As shown in the upper table of Table 1, in the E. coli test results, the number of viable bacteria decreased in all paper napkins coated with antibacterial agents compared to the target experimental data (hereinafter referred to as "blank data"). In particular, when the paper napkin weighed 61 g per 100 sheets, the bacteriostatic activity value was 2.2 or more, indicating an excellent antibacterial effect.

As shown in the table below Table 1, in the Staphylococcus aureus test results, the number of viable bacteria was significantly reduced in all of the paper napkins coated with the antibacterial agent compared to the blank data. In particular, the paper napkins weighing 58 g, 59 g, and 61 g per 100 sheets had a bacteriostatic activity value of 2.2 or more, indicating an excellent antibacterial effect.
From the above, it was confirmed that the paper napkin 10B of this example has a sufficient antibacterial effect.

(Comparative example 1)
As a comparative example, an experiment was conducted in which the first spray nozzle 322 was used to spray the antibacterial agent 36 only on one side of the base-paper sheet 10A. The manufacturing conditions for the paper napkin 10B are the same as in Experimental Example 1.
In this case, although the effect of inhibiting the growth of bacteria was observed compared to the case where no antibacterial agent was applied, the bacteriostatic activity value was less than 2.2 for both E. coli and Staphylococcus aureus (not shown). ).

(Comparative example 2)
Also, an experiment was conducted in which the amount of the antibacterial agent 36 applied was set to 0.0001% by weight (the ratio of the antibacterial agent was 0.0001% by weight) with respect to the weight of the base paper sheet. The manufacturing conditions for the paper napkin 10B are the same as in Experimental Example 1.
In this case, the bacteriostatic activity value against both Escherichia coli and Staphylococcus aureus was less than 2.2, and the excellent antibacterial effect as in the above examples was not observed.

(Experimental example 2)
Subsequently, a sensory evaluation test was conducted on the paper napkin 10B produced in Experimental Example 1 above. In this test, five subjects evaluated the odor of the paper napkin 10B. In addition, sticking between the paper napkins 10B was also evaluated. The manufacturing conditions for the paper napkin 10B are the same as in Experimental Example 1.
In addition to 0.0050% by weight of the base paper sheet, 0.0100% by weight, 0.0200% by weight, 0.0400% by weight, and 0.0500% by weight of the antibacterial agent 36 are applied. Evaluation was made on a total of 5 levels.

In the case of the paper napkins 10B in which the amount of the antibacterial agent 36 applied was 0.0050% by weight, 0.0100% by weight, and 0.0200% by weight with respect to the weight of the base paper sheet, no odor peculiar to benzalkonium chloride was observed. rice field.
On the other hand, when the same weight ratio was 0.0400% by weight, an odor peculiar to benzalkonium chloride was observed (same judgment by all the subjects).

Similarly, sticking between the paper napkins 10B was evaluated. When the amount of the antibacterial agent 36 applied was 0.0050% by weight and 0.0100% by weight with respect to the weight of the base paper sheet, no sticking between the paper napkins 10B was observed.

On the other hand, when the weight ratio was 0.0200% by weight and the weight ratio was 0.0400% by weight, sticking of the paper napkins 10B to each other was slightly observed. In particular, when the weight ratio was 0.0400% by weight, strong sticking was observed.

As described above, according to the present embodiment, the antibacterial agent-containing sheet manufacturing apparatus 1 can obtain the antibacterial agent-containing paper napkin 10B in which the antibacterial agent is applied to both sides of thin paper having a small basis weight. According to the method of this embodiment, continuous mass production is possible without breakage during the manufacturing process. The obtained paper napkin 10B exhibits a sufficient antibacterial effect even though it contains a small amount of the antibacterial agent.

Compared to the method of immersing the base-paper sheet 10A in an antibacterial agent, the antibacterial agent can be evenly applied to the base-paper sheet 10A, and the amount of the antibacterial agent can be reduced. Since the paper napkin 10B manufactured by the antibacterial agent-containing sheet manufacturing apparatus 1 has a small basis weight, it is economical because it does not take up space in food and drink facilities such as restaurants.

(Modification)
The present invention is not limited to the above-described embodiments, but includes various modifications of the above-described embodiments within the scope of the present invention.

For example, in the above-described embodiment, the thickness of each paper napkin 10B was 550 micrometers. A paper napkin 10B having an antibacterial action was obtained.

Although benzalkonium chloride was used as the antibacterial agent 36 in the above-described embodiment, benzethonium chloride may be used instead of benzalkonium chloride. The use of benzethonium chloride also provided the same antibacterial and deodorant effect as that of benzalkonium chloride (not shown).

In the above-described embodiment, the water content is about 9.8% by weight with respect to the weight of the entire paper napkin 10B (for example, in the case of 61 g in Table 1, the amount of antibacterial agent is very small, so the water content is approximately (61 g - 55 g)/61 g x 100 = 9.8%), but this water content can be adjusted as appropriate.

For example, even if the content of the antibacterial agent 36 and the water content in the paper napkin 10B was 20% by weight, no sticking of the paper napkin 10B was observed.
The content of the antibacterial agent 36 and the water content in the paper napkin 10B is 15% by weight rather than 20% by weight, so that the sheets do not stick to each other and are easier to peel off, and 10% by weight is more sticky than 15% by weight. decreased.

The number and arrangement of the guide rolls 22 are not limited to those shown in the drawings, and can be changed as appropriate within the scope of the present invention.

Further, in the above-described embodiment, the antibacterial agent 36 is applied by a sprayer having a spray nozzle 32 as the applicator 30, but the antibacterial agent 36 may be applied by a gravure printing method or a flexographic printing method. However, the method using a sprayer as shown in the above-described embodiment is more preferable because it is possible to apply a very small amount of the antibacterial agent aqueous solution over a wide area.

In the above, as an example of the antibacterial agent-containing sheet, the method for producing an antibacterial agent-containing paper napkin was described as an example, but the antibacterial agent-containing sheet is a paper apron or a sheet for a paper sheet to be laid under tableware. can be
However, when the antibacterial agent-containing sheet is a folded paper napkin for hand disinfection, even a small amount of the antibacterial agent exerts a sufficient antibacterial effect suitable for the application. In particular, there is an advantage that the base paper sheet 10A does not break during the manufacturing process even if C-folding is applied.

In the embodiments described above, the order of the manufacturing steps can be changed without departing from the scope of the present invention. For example, the embossing process may be performed after the drying process. Further, in the above-described embodiment, the cutting process is performed after the paper folding process, but the base paper sheet 10A may be cut and then folded by a paper folding machine.

Moreover, although there are two spray nozzles 32 in the above-described embodiment, the number of spray nozzles 32 is not limited to two, and three or more nozzles may be provided. In this case, since the same amount of the antibacterial agent 36 can be further dispersed and applied, there is an advantage that the paper is less likely to break.
Taking FIG. 1 as an example, the third nozzle in this case is preferably arranged on the right side of the paper sheet 10A between the guide rolls 22e and 22f. In this case, the antibacterial agent 36 is sprayed on one side (right side of the paper surface) of the base paper sheet 10A.

FIG. 2 is a view showing the antibacterial agent-containing sheet manufacturing apparatus 1 when the embossing process is omitted. Although the manufacturing method of the embodiment described above includes the embossing process, the embossing process may be omitted. However, as described above, the embossing process has the effect of suppressing breakage and the like, so it is preferable to include the embossing process.

FIG. 3 shows the antibacterial agent-containing sheet manufacturing apparatus 1 that does not include the paper folding machine 50 and the cutting machine 60. As shown in FIG. In this modified example, the base-paper sheet 10A is wound using a winding roll 28 having a rotational driving force.

The manufacturing method of the antibacterial agent-containing sheet of the present embodiment has the advantage that the base paper sheet 10A does not break even if the paper folding step and the cutting step are performed in order after the antibacterial agent coating step and the drying step. Therefore, in consideration of manufacturing efficiency, it is preferable that the antibacterial agent-containing sheet manufacturing apparatus 1 shown in FIGS.

By distributing paper napkins coated with an antibacterial agent to the food service industry and other industries, it is possible to contribute to the development of industry while further promoting measures to prevent infectious diseases.

1 antibacterial agent-containing sheet manufacturing apparatus 10 raw roll 10A base paper sheet 10B paper napkin 20 roll 22 induction roll 24 double-sided embossing roll 242 embossing roll 244 paper roll 26 press roll 28 take-up roll 30 applicator 32 spray nozzle 322 first spray Nozzle 324 Second spray nozzle 34 Storage tank 36 Antibacterial agent 40 Dryer 42 Hot air outlet 50 Paper folding machine 60 Cutting machine 62 Stacking unit

Claims (8)

A method for manufacturing an antibacterial agent-containing sheet, comprising:
A feed-out step of feeding out a pulp-containing base-paper sheet having a basis weight of 12 g or more and 20 g or less per square meter and composed of a single layer from a base-paper roll;
a first coating step of coating one side of the base paper sheet with an antibacterial agent;
a second coating step of coating the other surface of the base paper sheet with an antibacterial agent;
a drying step of drying the base paper sheet with a warm air dryer or an infrared dryer;
A cutting step of cutting the base paper sheet to a predetermined size,
The antibacterial agent is characterized by containing a quaternary ammonium salt compound as a main component,
A method for producing an antibacterial agent-containing sheet. The content of the quaternary ammonium salt compound is 0.0005% by weight or more and 0.0200% by weight or less with respect to the weight of the base paper sheet,
The method for producing the antibacterial agent-containing sheet according to claim 1. 3. The method for producing an antibacterial agent-containing sheet according to claim 1, wherein the quaternary ammonium salt compound is benzalkonium chloride. an embossing step of embossing the base-paper sheet after the feeding step and before the first coating step;
After the first coating step and before the second coating step, an impregnation step of impregnating the base paper sheet with the antibacterial agent by a guide roll is provided,
A method for producing an antibacterial agent-containing sheet according to any one of claims 1 to 3. 5. The method for producing an antibacterial agent-containing sheet according to claim 4, wherein in the impregnation step, the angle at which the base paper sheet is bent by the guide roll is 90 degrees or more and 120 degrees or less. An antibacterial agent-containing sheet consisting of a single layer,
The antibacterial agent-containing sheet impregnates the antibacterial agent in the vicinity of both surfaces of the pulp-containing base paper sheet,
The basis weight of the pulp-containing base paper sheet is 12 g or more and 20 g or less per square meter,
The pulp-containing base paper sheet has a thickness of 400 micrometers or more and 1100 micrometers or less,
The antibacterial agent contains benzalkonium chloride as a main component,
An antibacterial agent-containing sheet, wherein the content of the benzalkonium chloride is 0.0005% by weight or more and 0.0200% by weight or less with respect to the weight of the base paper sheet. 7. The antibacterial agent-containing sheet according to claim 6, wherein the moisture content is 20% by weight or less with respect to the weight of the entire antibacterial agent-containing sheet. 8. The antibacterial agent-containing sheet according to claim 6, wherein the antibacterial agent-containing sheet is a C-folded paper napkin for hand disinfection.

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