KR102143919B1 - Method for manufacturing of wet tissue and wet tissue prepared therefrom - Google Patents

Abstract

The present invention relates to a method of manufacturing a wet wipe by impregnating a nonwoven fabric with a dipping solution, comprising the steps of: preparing a nonwoven fabric; processing hydrophilic treatment for the nonwoven fabric; preparing a dipping solution consisting of electrolyzed water having a pH of 10.5 to 12.5; and impregnating the nonwoven fabric with the dipping solution. The wet wipe does not cause harmful environmental pollution.

Description

Method for manufacturing wet tissue and wet tissue prepared therefrom

The present invention relates to a wet tissue, and more particularly, to a method of manufacturing a wet tissue by impregnating electrolyzed water into a nonwoven fabric.

Wet wipes are used to remove contamination and clean the skin. Wet wipes are made of a dipping liquid on the fabric. Since wet tissue is a product used by contacting the skin, the dipping solution is required to have antibacterial properties and safety for the skin.

Wet tissue is manufactured by cutting the fabric into a thin sheet and impregnating the cut fabric with a dipping solution.

As a wet tissue fabric, synthetic fibers such as PET (poly-ethylene terephthalate) and PP (polypylene) and natural fibers such as cotton may be prepared alone or in combination.

Dipping liquid used in wet tissues contains various substances for cleaning and antibacterial, such as disinfectant, antibacterial, preservative, surfactant, etc. to purified water. Among the ingredients included in the wet tissue dipping solution, chemical additives can cause skin diseases if used frequently. These substances can be a big problem even when added in small amounts, especially when used for infants.

Recently, wet tissue products using natural substances that are harmless to the human body have been developed.

Korean Patent Publication No. 10-2017-0029995 discloses a process for manufacturing a wet tissue containing a preservative-free natural mineral component. The prior document is preparing an antibacterial aqueous solution by diluting a natural mineral component, that is, an ESN material.

In addition, the complex function antibacterial cleaning wipes disclosed in Korean Patent Application Publication No. 10-2013-0028196 are prepared with an antibacterial aqueous solution using a mulberry pulp liquid, jade powder, biotite powder, green tea powder, and the like.

Korean Patent Publication No. 10-2017-0029995, A wet tissue manufacturing process capable of antibacterial super bacteria only with a diluted solution of a preservative-free natural mineral component (ESN material) Unexamined Patent Publication No. 10-2013-0028196, Multifunctional antibacterial cleaning wipes Registered Patent Publication No. 10-1646745, Anti-fungal antibacterial antiviral preservative-free non-woven fabric product manufacturing method Registered Patent Publication No. 10-1555341, Antibacterial wet tissue and its manufacturing method

An object of the present invention is to provide a method for manufacturing a wet tissue having excellent skin stability and excellent antibacterial properties and cleansing power.

Another object of the present invention is to provide a method for producing a wet tissue having skin stability, antibacterial properties, and cleansing power without the use of chemicals.

The problem to be solved of the present invention is not limited to the mentioned problem. Other technical problems not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

The present invention is a method of preparing a wet tissue by impregnating a dipping solution into a nonwoven fabric, wherein the wet tissue production method includes preparing a nonwoven fabric, hydrophilic treatment of the nonwoven fabric, and a dipping solution comprising electrolytic water having a pH of 10.5 to 12.5. Preparing and impregnating the nonwoven fabric with a dipping solution.

Electrolyzed water according to the present invention is obtained by electrolyzing treated water containing an electrolyte, wherein the treated water is contained in a treatment tank, and the treatment tank is a first treatment space in which an anode separated by a diaphragm is installed and a first treatment space in which a cathode is installed. It consists of two treatment spaces, and the dipping liquid is generated from the first treatment space.

The electrolyte according to the present invention consists of calcium chloride (NaCl) or potassium chloride (KCl).

According to the present invention, since no hazardous chemicals are used as a dipping liquid for wet tissues, harmful environmental pollution due to wet tissues is not caused when the wet tissues are discarded after use.

1 shows a wet tissue dipping liquid manufacturing apparatus according to a first embodiment of the present invention.
Figure 2 shows a wet tissue dipping liquid manufacturing apparatus according to a second embodiment of the present invention.
Figure 3 shows a wet tissue manufacturing method according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a wet tissue made to have excellent cleaning power, antibacterial properties, and skin stability by using electrolyzed water without adding chemicals.

The wet tissue according to the present invention includes a nonwoven fabric and a dipping solution impregnated with the nonwoven fabric.

The non-woven fabric may be prepared by combining natural fibers such as cotton, rayon, PET (poly-ethylene terephthalate), and PP (polypylene), or chemical fibers alone or in combination.

Non-woven fabric refers to fabrics arranged in a negative direction without going through the weaving process. Nonwovens can be made from meltblown devices. The melt blown device consists of an extruder and a collection unit. The extruder melts polypylene and converts it into fiber yarns and spins, and the collection unit collects the spun yarns to form a nonwoven fabric.

As an example, the nonwoven fabric is required to secure sufficient pores to rapidly absorb the dipping liquid. For this purpose, the nonwoven fiber yarn is preferably formed of 0.5 to 1.5 denier. Fiber yarns having a relatively large diameter cannot ensure sufficient impregnation retention power of the dipping solution, and fiber yarns having a relatively small diameter may have a slow impregnation speed of the dipping solution.

In addition, it is preferable that the dry weight per unit volume of the nonwoven fabric is 130 to 250 g/m ³ . In the case of a relatively large weight, the dipping speed may be slow, and in the case of a relatively small weight, the impregnation retention of the dipping liquid may not be sufficient.

Dipping liquid is required for cleansing properties, antibacterial properties, sterilization and disinfection, and skin stability. Dipping liquid with a pH of 5.0 or less is acidic and has excellent sterilization and deodorizing power. In addition, the dipping solution of pH 10.5 or higher is alkaline and has excellent sterilization and cleaning power. If a dipping solution of more than 5.0 and less than 10.5 is used, the antibacterial and sterilizing power may be lowered. In the present invention, as an example, a dipping solution having a pH of 10.5 to 12.5 is used. Dipping liquids below pH 2.7 may irritate the skin.

1 shows a wet tissue dipping liquid manufacturing apparatus according to a first embodiment of the present invention.

Referring to the drawings, treated water in which an electrolyte 300 is mixed with raw water 200 is supplied to a treatment tank. Raw water may be tap water, ground water, ultrapure water, etc., and soft water may be used when tap water and ground water have a large hardness component. The electrolyte may be calcium chloride (NaCl) or potassium chloride (KCl).

The treatment tank 100 is provided with a membrane 110 and is separated into a first treatment space and a second treatment space by the diaphragm. The diaphragm refers to a membrane through which ions can pass. The first electrode 120 is installed in the first processing space, and the second electrode 130 is installed in the second processing space. A direct current power source (DC) is connected to the first electrode and the second electrode. As an embodiment, the first electrode may be an anode connected to a DC power source, and the second electrode may be a cathode connected to a DC power source.

The electrochemical reaction of the first treatment space is as follows.

NaCl → Na ^{+ +} Cl ^-

2Cl → Cl ₂ + 2e

Cl ₂ + H ₂ O → HOCL + 2e

Then, the electrochemical reaction of the second processing space is as follows.

2Na ⁺ + 2e → 2Na

2Na + 2H ₂ O → 2NaOH + H ₂

The oxidation-reduction potential (ORP) of the first processing space is +1150mV, and the oxidation-reduction potential of the second processing space is -850mV.

By electrochemical reaction by the first electrode 120 and the second electrode 120, the treated water in the first treatment space is generated as acidic water with a pH of 2.2 to 2.7, and the treated water in the second treatment space is pH 11.3 to It is produced with 12.5 alkaline water. The treated water produced here exhibits excellent performance in acid bacteria and disinfection.

In the first embodiment of the present invention, alkaline water having a pH of 11.3 to 12.5 is used as a dipping solution for wet tissues.

In the first embodiment, electrolyzed water is prepared by adding an electrolyte to the treated water, but in the second embodiment, electrolyzed water is prepared without adding an electrolyte.

Figure 2 shows a wet tissue dipping liquid manufacturing apparatus according to a second embodiment of the present invention.

In the second embodiment, tap water (CW) or ultrapure water is provided as treated water, and the treated water is supplied to the treatment space through the filter 500. As a filler for the filter, a mixture of activated carbon and calcium sulfite may be used.

The electrochemical reaction of the first treatment space is as follows.

^{_{H 2 O → H + + OH}} -

_{^{4OH - → 2H 2 O + O}} 2 + 2e

Then, the electrochemical reaction of the second processing space is as follows.

^{_{H 2 O → H + + OH}} -

2H ⁺ + 2e → H ₂

The oxidation-reduction potential (ORP) of the first processing space is +800mV, and the oxidation-reduction potential of the second processing space is -200mV.

The treated water in the first treatment space is generated as acidic water with a pH of 2.7 to 5.0 by electrochemical reaction by the first and second electrodes, and the treated water in the second treatment space is produced with alkaline water with a pH of 10.5 to 11.3. The treated water produced here exhibits excellent performance in sterilization and disinfection.

In the second embodiment of the present invention, alkaline water having a pH of 10.5 to 11.3 is used as a dipping solution for wet tissues.

Hypochlorous acid (HOCl) easily passes through the microbial cell membrane. When microorganisms are exposed to hypochlorous acid, protein synthesis and oxidative phosphorylation are inhibited, resulting in a bactericidal effect.

Hereinafter, manufacturing a wet tissue by impregnating the dipping liquid according to the present invention into a nonwoven fabric will be described.

Figure 3 shows a wet tissue manufacturing method according to the present invention.

The wet tissue manufacturing method according to the present invention includes the steps of preparing a nonwoven fabric (S100), treating the nonwoven fabric with hydrophilicity (S200), preparing a dipping liquid (S300), and adding a dipping liquid to the nonwoven fabric. A first impregnation step (S400) of spraying a dipping liquid to be more than a standard impregnation rate, a dipping liquid removal step (S500) of removing liquid so that the first impregnated nonwoven fabric is less than the standard impregnation rate (S500), and the nonwoven fabric fabric having completed liquid removal It includes a second impregnation step (S600) of spraying the dipping solution to have a standard impregnation rate.

1. Step of preparing a nonwoven fabric (S100);

First, prepare a nonwoven fabric. The non-woven fabric can be produced in a melt blown manner. Here, the melt blown method refers to obtaining a fibrous web collected on the collecting part by melting the polymer fiber material and then spinning it with hot air.

As an example, the nonwoven fabric may have a fiber yarn of at least 0.5 to 1.5 denier, and a dry weight per unit volume of 130 to 250 g/m ³ may be. Since the dipping liquid impregnated into the nonwoven fabric is an ionic liquid, it is preferable to have a certain size of pores. In addition, the nonwoven fabric should have adequate wettability and impregnation retention of the dipping liquid. Therefore, the predetermined dry weight per unit volume allows the nonwoven fabric to have impregnation holding power of the dipping liquid.

2. Hydrophilic treatment of the nonwoven fabric (S200);

Subsequently, when the nonwoven fabric is prepared, the nonwoven fabric may be treated with hydrophilicity. The hydrophilic treatment increases the surface energy of the nonwoven fabric yarn and lowers the contact angle. Accordingly, it is possible to improve the absorption power of the dipping liquid. As an example, the hydrophilic treatment may be a plasma treatment method using nitrogen or oxygen. Of course, surface modification and chemical treatment for hydrophilic treatment may be performed. The plasma hydrophilic treatment may be performed in a low vacuum chamber lower than atmospheric pressure. By performing the hydrophilic treatment in a low vacuum, the surface activity rate of the fiber yarn of the nonwoven fabric can be increased.

As an example, the hydrophilic treatment step may be performed before or after cutting the nonwoven fabric into a predetermined size.

3. Preparing a dipping solution (S300);

In the step of preparing the dipping solution, acidic water and alkaline water are obtained by electrolyzing treated water in which calcium chloride or potassium chloride is mixed with raw water. According to the present invention, alkaline water can be used as a dipping liquid. In another embodiment, the raw water is electrolyzed alone to obtain acidic water and alkaline water, and alkaline water may be used as a dipping liquid.

On the other hand, when the dipping solution is obtained by using an electrolyte, stickiness may occur during use due to salt components. For this purpose, it is necessary to set the concentration of the dapping solution without stickiness with at least the required antibacterial properties. As an example, the concentration of the salt component is preferably adjusted to 5-8 ppm. If it is lower than this, the antibacterial activity may be lowered, and if it is higher than this, stickiness may occur when used.

4. The first impregnation step (S400) of spraying the dipping solution so that the dipping solution is more than the standard impregnation rate on the nonwoven fabric;

The nonwoven fabric is provided in a state seated on the mesh net, and a dipping solution is sprayed on the upper side of the nonwoven fabric. As another embodiment, the dipping solution may be sprayed simultaneously on the upper and lower sides of the nonwoven fabric.

In this step, the dipping liquid may be sprayed to have a predetermined reference impregnation rate or more. Here, the reference impregnation rate refers to the impregnation rate of the final product wet tissue, and the impregnation rate is calculated as a ratio of the difference in weight before and after impregnation by spraying a dipping solution onto the nonwoven fabric.

Impregnation rate (%) = (weight after impregnation (g)-dry weight before impregnation (g))/(dry weight before impregnation (g)) ×100

As an example, the reference impregnation rate may be 250 to 350%, and if it is higher than this, the dipping liquid may leak out during use, and if it is lower than this, the expected wettability may not be exhibited.

5. A dipping liquid removing step (S500) of removing liquid so that the first impregnated nonwoven fabric is less than the reference impregnation rate;

In this step, the first impregnated nonwoven fabric is pressed to remove the impregnation liquid impregnated into the nonwoven fabric so that the impregnation rate is less than the standard. The non-woven fabric seated on the mesh net is pressurized using a mesh net or a pressing roll to remove liquid so that it is less than a predetermined standard impregnation rate. The dipping liquid can easily permeate between the yarn and the yarn of the nonwoven fabric by the pressure.

6. A second impregnation step (S600) of spraying a dipping liquid to have a standard impregnation rate on the nonwoven fabric having been removed from liquid.

The impregnation rate of the nonwoven fabric that has gone through the dipping liquid removal step is below the standard impregnation rate. In this step, a standard impregnation rate may be obtained by spraying a dipping liquid to have an impregnation rate that a commercialized wet tissue can have.

The non-woven fabric has pores formed between the yarn and the yarn, and the dipping liquid does not easily penetrate between the yarn and the yarn. Therefore, the dipping solution is sufficiently first sprayed so as to be more than the standard impregnation rate, and then the dipping solution is easily permeated between the yarn and the yarn by undergoing a liquid removal process. Thereafter, a wet tissue having a predetermined standard impregnation rate may be manufactured through a secondary spraying process.

In the above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill in the art within the scope of the technical idea of the present invention.

100: treatment tank
110: diaphragm
120: anode
130: cathode
200: enemies
300: electrolyte
500: filter
CW: tap water
AA: acidic water
BB: Alkaline water

Claims (3)

Preparing a nonwoven fabric having a fiber yarn of at least 0.5 to 1.5 denier and having a dry weight per unit volume of 130 to 250 g/m ³ ,
Hydrophilic treatment of the nonwoven fabric, and
Preparing a dipping solution consisting of alkaline electrolyzed water having a pH of 10.5 to 12.5, and
The first impregnation step of spraying the dipping solution so that the dipping solution is more than the standard impregnation rate on the nonwoven fabric, and
A dipping solution de-liquid step of removing liquid so that the first impregnated nonwoven fabric is less than a standard impregnation rate,
A wet tissue manufacturing method comprising a second impregnation step of spraying a dipping solution so as to have a standard impregnation rate on the nonwoven fabric having been removed from liquid.
The method according to claim 1,
The reference impregnation rate is 250 to 350%, and the impregnation rate is calculated according to the following <Equation 1>.
<Equation 1>
Impregnation rate (%) = (weight after impregnation (g)-dry weight before impregnation (g))/(dry weight before impregnation (g)) ×100
Wet tissue prepared according to the method according to claim 1 or 2.

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