JP7005055B1 - Manufacturing method of water-melting paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing hydrolyzed paper, which is easy to produce and can reduce the production cost. SOLUTION: A base paper sheet 20 impregnated with a water-soluble binder is used, and embossing is performed to form a bulky portion by a large number of uneven bodies 120, and after the step, water 510 is supplied from the outer surface side. It is characterized by comprising a water impregnation step of impregnating with water, a drying step of drying after the step, a folding step of folding after the step, and an aqueous chemical impregnation step of supplying and impregnating the aqueous chemical solution 1000. It is a manufacturing method of water-melting paper. [Selection diagram] Fig. 1

Description

The present invention relates to a method for producing a water-melting paper used for a toilet cleaner or the like.

Conventionally, water-melting paper has been widely used for toilet cleaners, but in general, water-melting paper used for toilet cleaners is made by stacking multiple thin papers and adhering them to each other via a water-soluble binder and embossing them. It is formed into a bulky structure by the uneven shape of the above and is impregnated with an aqueous chemical. A toilet cleaning paper towel having such a basic configuration is shown in, for example, Patent Document 1 below.

Jikkenhei 2-103397 Gazette

However, the toilet cleaning paper towel proposed in Patent Document 1 is a towel body in which a plurality of water-soluble papers are stacked, the papers are bonded with a water-soluble adhesive, and the entire surface is embossed in an uneven shape. Is formed and the towel body is impregnated with a disinfectant solution. However, it takes time and effort to bond and integrate the adhesives between the papers, and the manufacturing cost is high.

Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a method for producing hydrolyzed paper, which is easy to produce and can reduce the production cost.

As a result of diligent research to solve the above-mentioned object, the present inventors have surprisingly succeeded in easily producing hydrolyzed paper and reducing the manufacturing cost of hydrolyzed paper. The invention was completed.

That is, the present invention
Using a base paper sheet impregnated with a water-soluble binder,
An embossing process in which the base paper sheet is embossed to form a bulky portion due to a large number of uneven bodies on the base paper sheet.
After the embossing step, a water impregnation step of supplying water to the base paper sheet from the outer surface side and impregnating the base paper sheet with the water.
After the water impregnation step, a drying step of drying the base paper sheet and a drying step
After the drying step, a folding step of folding the base paper sheet and a folding step of folding the base paper sheet,
Provided is a method for producing a hydrolyzed paper, which comprises a water-based agent impregnation step of supplying an aqueous agent to the base paper sheet and impregnating the base paper sheet with the aqueous agent.

In the method for producing a hydrolyzed paper according to the present invention.
The base paper sheet may be impregnated with a cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form a cross-linking structure of the water-soluble binder before the folding step.

In the method for producing a hydrolyzed paper according to the present invention.
The cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure is used in the first drying step following the impregnation of the base paper sheet with the water-soluble binder in the binder impregnation step. The base paper sheet may be impregnated before.

According to the present invention, the hydrolyzed paper can be easily manufactured and the manufacturing cost of the hydrolyzed paper can be reduced. The effects described here are not necessarily limited, and may be any of the effects described in the present specification.

FIG. 1 is a process diagram showing an example of manufacturing the hydrolyzed paper of the present invention. FIG. 2 is a partial plan view showing an example of the hydrolyzed paper of the present invention. FIG. 3 is a vertical cross-sectional view taken along the line AA in FIG.

Hereinafter, suitable embodiments for carrying out the present invention will be described. The embodiments described below show an example of a typical embodiment of the present invention, and the scope of the present invention is not narrowly interpreted by this. Unless otherwise specified, in the drawings, "upper" means the upper direction or the upper side in the drawing, "lower" means the lower direction or the lower side in the drawing, and "left" means. It means the left direction or the left side in the figure, and "right" means the right direction or the right side in the figure. Further, in the description using drawings, the same or equivalent elements or members are designated by the same reference numerals, and duplicate description will be omitted unless there are special circumstances.

<Outline of the present invention>
First, the outline of the present invention will be described. The present invention relates to a method for producing a water-melting paper used for a toilet cleaner or the like.

The method for producing a hydrolyzed paper according to the present invention is an embossing step of using a base paper sheet impregnated with a water-soluble binder and embossing the base paper sheet to form a bulky portion with a large number of uneven bodies on the base paper sheet. After the embossing step, a water impregnation step of supplying water to the base paper sheet from the outer surface side and impregnating the base paper sheet with the water, and a drying step of drying the base paper sheet after the water impregnation step. After the drying step, the base paper sheet is characterized by comprising a folding step of folding the base paper sheet and an aqueous chemical impregnation step of supplying the base paper sheet with the aqueous chemical and impregnating the base paper sheet with the aqueous chemical. It is a manufacturing method. According to the method for producing a hydrolyzed paper according to the present invention, the hydrolyzed paper can be easily manufactured and the manufacturing cost of the hydrolyzed paper can be reduced.

The above description is an outline of the present invention.

Hereinafter, suitable embodiments for carrying out the present invention will be specifically and in detail described. It should be noted that the embodiments described below show an example of a typical embodiment of the present invention, and the scope of the present invention is not narrowly interpreted by this.

INDUSTRIAL APPLICABILITY According to the present invention, hydrolyzed paper can be produced from a hydrolyzable paper material. In the present invention, a base paper sheet as a raw material sheet is processed by a plurality of steps to produce hydrolyzed paper, and various raw material pulps can be used as the material of the base paper sheet here. Examples of the raw material pulp that can be used in the present invention include wood pulp, synthetic pulp, and used paper pulp. Further, not only natural fibers such as pulp but also semi-synthetic fibers such as rayon can be used. Further, in the present invention, a toilet paper material can be used as the raw material pulp, and in this case, it is preferable to use a mixture of softwood bleached kraft pulp and hardwood bleached kraft pulp. Further, as the material of the base paper sheet in the present invention, kenaf, bamboo fiber, straw, cotton, cocoon thread and the like can be used.

In the present invention, the embossing has the meaning of increasing the strength and enhancing the cleaning function (particularly the wiping function) by forming a bulky structure by imposing a large number of irregularities on the base paper sheet.

As the water-soluble binder used in the present invention, various binders may be used as long as they have a predetermined adhesive strength and can impart a predetermined strength to the hydrolyzed paper.

Examples of the water-soluble binder used in the present invention include polysaccharide derivatives, natural polysaccharides, synthetic polymers and the like. Examples of the polysaccharide derivative include carboxymethyl cellulose, carboxyethyl cellulose, carboxymethylated starch or a salt thereof, starch, methyl cellulose, ethyl cellulose and the like. Examples of natural polysaccharides include guar gum, tranth gum, xanthan gum, sodium alginate, carrageenan, gum arabic, gelatin, casein and the like. Examples of the synthetic polymer include polyvinyl alcohol, polyvinyl alcohol derivatives, polymers of unsaturated carboxylic acids or salts of copolymers, and examples of the unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic anhydride, and maleic acid. Examples include acid and fumaric acid. Of the above, it is particularly preferable to use carboxymethyl cellulose.

The base paper sheet impregnated with the water-soluble binder is further impregnated with the aqueous agent. Aqueous chemicals include chemicals that impart a cleaning function to hydrolyzed paper, as well as chemicals that are formulated for other purposes. As the aqueous agent, a water-based composition containing water, a cross-linking agent, and a water-soluble organic solvent is used, and if necessary, a surfactant, a bactericide, a preservative, a deodorant, a bleaching agent, etc. A chelating agent, a fragrance, etc. can be blended.

The cross-linking agent causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure, thereby improving the physical strength. When a water-soluble binder having a carboxyl group such as carboxymethyl cellulose is used as the water-soluble binder, it is preferable to use a polyvalent metal ion as the cross-linking agent, and the polyvalent metal ion is zinc or an alkaline earth metal. , Manganese, nickel, cobalt and other metal ions. Specifically, zinc, calcium, barium, cobalt, and nickel ions are preferably used, and these are preferable in imparting sufficient wettability.

The above polyvalent metal ions are used in the form of water-soluble metal salts such as sulfates, chlorides, hydroxides, carbonates and nitrates. The cross-linking agent is one of the compounding components constituting the aqueous drug, but may be separated from the aqueous drug and used alone as described later.

Water-soluble organic solvents include monohydric alcohols such as ethanol, methanol and isopropyl alcohol, glycols such as ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, butylene glycol and hexylene glycol, and these glycols and methanol, ethanol and propanol. , Monoethers or diethers with lower alcohols such as butanol, esters of the glycols with lower fatty acids, polyhydric alcohols such as glycerin and sorbitol can be used.

Examples of the surfactant to be blended in the aqueous agent as required include anionic surfactant, nonionic surfactant, cationic surfactant and amphoteric surfactant, and in particular, polyoxyalkylene alkyl ether. , Alkyl glycosides, sorbitan fatty acid esters and the like are preferably used.

Next, an embodiment of the method for producing a hydrolyzed paper of the present invention will be described based on the process diagram shown in FIG. In the figure, reference numeral 100 is a feed roll wound around a base paper sheet 20 impregnated with a long water-soluble binder, and the base paper sheet 20 is fed by a pinch roll 300 in the Y direction of the arrow. As the base paper sheet 20, a single-layer structure made of one thin paper such as toilet paper may be used, or a plurality of two or more thin paper sheets may be stacked to form a multi-layer structure. Then, as described above, the base paper sheet 20 is impregnated with a water-soluble binder. Hereinafter, a method for producing the base paper sheet 20 will be described. In the present specification, the base paper sheet before the water-soluble binder is impregnated is referred to as a pre-impregnation base paper sheet, and the base paper sheet after the water-soluble binder is impregnated is referred to as a base paper sheet 20.

The base paper sheet 20 is impregnated with a water-soluble binder. As the water-soluble binder, for example, carboxymethyl cellulose is used. The means for supplying the water-soluble binder is to spray the water-soluble binder solution onto the surface of the pre-impregnation base paper sheet from the nozzle of the spraying device. In this way, the pre-impregnation base paper sheet is impregnated with a water-soluble binder supplied from the outer surface side of the base paper sheet. In this case, the water-soluble binder solution may be sprayed on only one side of the pre-impregnation base paper sheet or on both the front and back sides. As a spray nozzle used for spraying, a one-fluid nozzle that injects a pressurized water-soluble binder solution alone, or a water-soluble binder solution that mixes compressed air and a water-soluble binder solution and uses the pressure of the compressed air. Any nozzle of the two-fluid type nozzle that injects water into a mist can be used.

The means for supplying the water-soluble binder solution is not limited to the above-mentioned spraying, and for example, a method of dropping the water-soluble binder solution onto the surface of the pre-impregnation base paper sheet, a method of applying the water-soluble binder solution, or the like is adopted. May be good. Further, as will be described later, the present invention may include a step of impregnating the base paper sheet 20 having a bulky portion 170 with an aqueous agent and a step of impregnating the base paper sheet 20 with a cross-linking agent which is a compounding component of the aqueous agent. However, the aqueous drug solution is supplied to the base paper sheet 20 in the aqueous drug impregnation step, and the cross-linking agent solution is supplied to the base paper sheet 20 in the cross-linking agent impregnation step. Similar to the above-mentioned water-soluble binder solution supply means, any means such as a spraying method, a dropping method, and a coating method can be adopted. In the following description, a spraying method will be described as an example as a means of supplying them.

The amount (addition amount) of the water-soluble binder supplied to the pre-impregnation base paper sheet is preferably 50% by weight to 100% by weight with respect to the weight of the pre-impregnation base paper sheet, and the water-soluble binder solution. The concentration is preferably 1% to 20%.

Since the water-soluble binder solution is supplied from the outer surface side of the pre-impregnation base paper sheet, the surface of the pre-impregnation base paper sheet is also impregnated with the water-soluble binder. Therefore, in the finally produced hydrolyzed paper, the surface of the hydrolyzed paper is impregnated with the water-soluble binder solution. The water-soluble binder solution is impregnated from one surface (supply surface) of the pre-impregnation base paper sheet to the opposite surface in the thickness direction (that is, over the entire layer in the thickness direction), and even to the opposite surface. It may be impregnated halfway (that is, halfway in the thickness direction), but if it is impregnated over all layers in the thickness direction as in the former, it is on one side of the hydrolyzed paper and the opposite side in the thickness direction. , The surface of them is impregnated with a water-soluble binder.

In supplying and impregnating the above-mentioned water-soluble binder, a cross-linking agent which is a compounding component of the aqueous agent may be supplied and impregnated in addition to the water-soluble binder. That is, in the present invention, the water-soluble binder impregnation step may include a step of impregnating both the water-soluble binder and the cross-linking agent. In the first aspect of this embodiment, first, the pre-impregnation base paper sheet is sprayed with a water-soluble binder solution from the outer surface side of the base paper sheet to impregnate the water-soluble binder, and then the cross-linking agent solution is sprayed to crosslink. The agent is impregnated into the base paper sheet 20. As a second aspect, first, a cross-linking agent solution is sprayed onto the pre-impregnation base paper sheet from the outer surface side of the pre-impregnation base paper sheet to impregnate the cross-linking agent, and then a water-soluble binder solution is sprayed to the water-soluble binder. Is impregnated into the pre-impregnation base paper sheet. In the third aspect, the water-soluble binder solution is sprayed on the pre-impregnation base paper sheet from the outer surface side thereof, and at the same time, the cross-linking agent solution is sprayed to simultaneously impregnate the water-soluble binder and the cross-linking agent. Is. In each of these embodiments, the cross-linking agent may be impregnated with the entire amount required for forming a cross-linking reaction with the water-soluble binder, or may be impregnated with a partial amount thereof.

As described above, if the water-soluble binder and the cross-linking agent are impregnated together in the water-soluble binder impregnation step, the cross-linking reaction with the water-soluble binder occurs at an early stage, and the base paper sheet 20 is quickly subjected to a predetermined strength. Can be given.

The base paper sheet 20 impregnated with the water-soluble binder is sent to a dryer, where drying is performed (first drying step). Examples of the drying means include electromagnetic wave drying, aeration drying (hot air drying), infrared drying, hot roll drying, and the like, but electromagnetic wave drying is preferable. Electromagnetic wave drying uses electromagnetic waves for drying, and as the electromagnetic wave dryer used for this, a device having the same mechanism and structure as a microwave oven can be used. The electromagnetic wave drying according to the present invention is performed by microwave heating, and when irradiated with microwaves, a vibrator connecting water molecules having polarity absorbs microwaves and vibrates and rotates, and the temperature rises, and this temperature rises. It is based on the principle of evaporating water and drying it.

Electromagnetic wave drying has the advantage that it can be dried in a short time, and has a high ability to transmit electromagnetic waves, and can be uniformly heated by penetrating into the inside of the base paper sheet 20 and heating, so that it can be uniformly dried. Furthermore, in electromagnetic wave drying, electromagnetic wave energy is directly loaded and there is no secondary energy consumption, so energy can be saved by at least 30% compared to infrared heating, and energy consumption can be reduced, thus reducing manufacturing costs. Can contribute. As the electromagnetic wave dryer used in the present invention, for example, one having an ability to dry 1 kg of water per 1 kW of electric power in 1 hour is preferable. Further, as the electromagnetic wave dryer installed in the continuous production facility, it is preferable to use a tunnel type electromagnetic wave dryer capable of continuously passing the base paper sheet 20 inside the dryer, which is suitable for continuous production.

Infrared drying can also be suitably used as a means for drying the base paper sheet 20 impregnated with the water-soluble binder in the first drying step. Infrared rays have a wavelength band of 0.75 μm to 1000 μm, and are electromagnetic waves having a wavelength shorter than that of microwaves. Infrared rays are divided into near infrared rays (wavelength 0.7 μm to 2.5 μm) and far infrared rays (wavelength 4 μm to 1000 μm) depending on the wavelength. However, near infrared rays are not easily absorbed by an object and have low heating efficiency. It is preferable to use far infrared rays, which are easily absorbed by an object and have high heating efficiency. In the present invention, it is preferable to use far infrared rays having a wavelength of 4 μm to 50 μm among the wavelength bands of 4 μm to 1000 μm of far infrared rays. Far-infrared rays having a wavelength of 4 μm to 50 μm have high absorbance to water, and in the case of an object containing a large amount of water, most of the far-infrared rays are absorbed in a portion where the depth from the surface to the inside is relatively shallow.

Far-infrared drying is not a method of warming the air to dry the object to be dried, but a method of directly transferring heat to the object to be dried by heat rays generated by far-infrared rays to dry the object, which is so-called radiant heat drying. Therefore, since the body to be dried can be efficiently heated, the drying time can be shortened. It is also possible to reflect heat rays in a specific direction with a reflector or the like and concentrate them at a predetermined position for heating and drying. If such a drying method is adopted, the energy efficiency for drying can be improved. It can be improved and the drying process cost can be reduced.

As the far-infrared dryer, any structure can be used as long as it is provided with a heating element that generates far-infrared rays, and in this case, a dryer capable of maintaining the temperature of the heating element at 200 ° C. or higher is preferable. By keeping the temperature of the heating element at 200 ° C. or higher, far infrared rays can be efficiently generated. Further, if the power is intermittently energized by a thermostat or the like, power saving operation becomes possible.

In drying the base paper sheet 20 impregnated with the water-soluble binder by a dryer, the present invention is not limited to the case of drying by one dryer, and a plurality of dryers are installed and sequentially described in each dryer. The base paper sheet 20 may be fed and dried. That is, for example, the base paper sheet 20 transferred by the belt conveyor may be sent to the first dryer for drying, and then sent to the second dryer, where the second drying may be performed. In this case, the degree of drying can be different between the first-stage drying and the second-stage drying. Such multi-stage drying is particularly useful in electromagnetic wave drying and infrared drying. The present invention can also combine electromagnetic wave drying and infrared drying. An electromagnetic wave dryer and an infrared dryer are installed respectively. For example, the base paper sheet 20 is first sent to the electromagnetic wave dryer for electromagnetic wave drying, and then the base paper sheet 20 is sent to the infrared dryer for infrared drying. Alternatively, the order may be reversed so that infrared drying is first performed and then electromagnetic wave drying is performed. Further, the electromagnetic wave drying (or infrared drying) of the first stage drying and the infrared drying (or electromagnetic wave drying) of the second stage drying may be alternately repeated several times. Further, an electromagnetic wave heating mechanism and an infrared heating mechanism are provided in one dryer, and the base paper sheet 20 is sent to the dryer having such a structure, where the base paper sheet 20 is heated by electromagnetic waves and at the same time heated by infrared rays to dry by electromagnetic waves. It is also possible to perform drying by infrared rays at the same time.

The base paper sheet 20 dried by the dryer is passed through a pair of upper and lower embossing rolls 400, 400, where embossing is performed. The embossed rolls 400 and 400 are formed by projecting a large number of protrusions for embossing on the peripheral surface of the roll, and conventionally known embossed rolls can be used. The unevenness shaping by embossing may be formed on only one side of the base paper sheet 20 or on both the front and back sides thereof. When embossing is applied to both the front and back surfaces of the base paper sheet 20, an embossed roll made of a pair of upper and lower metal rolls is used in which a large number of protrusions for embossing are projected on the peripheral surface of the roll. When embossing is applied to only one side of the base paper sheet 20, it is composed of a metal roll having a large number of protrusions for embossing on the peripheral surface and a rubber holding roll forming a pair of upper and lower rolls with the roll. Embossed rolls are used.

As described above, in the present invention, the base paper sheet 20 dried by the dryer is embossed. Therefore, there is no possibility that the base paper sheet 20 adheres to the embossed rolls 400 and 400, so that it is not necessary to apply the release agent to the embossed rolls 400 and 400, and the base paper sheet 20 does not need to be coated with the release agent. You may. In order to further ensure that the base paper sheet 20 does not adhere to the embossed rolls 400 and 400, a release agent may be applied to the embossed rolls 400 and 400, or the base paper sheet 20 may be coated with a release agent. May be good. The embossing may be performed without heating the embossing rolls 400 and 400, but the embossing may be performed with the embossing rolls 400 and 400 heated to a predetermined temperature. In the latter case, the heating temperature of the embossed rolls 400 and 400 is preferably 60 ° C to 150 ° C.

By embossing, as shown in FIGS. 2 and 3, a concavo-convex body 120 composed of a large number of convex portions 130 and concave portions 140 is formed on the base paper sheet 20, and the bulky portion 170 is formed by the large number of concavo-convex bodies 120. It is formed. Depending on the embossing depth, it may not be able to follow the processing load force, and some of the interfiber bonds may be broken. When the embossing depth is small, such interfiber bond failure does not occur, but when the embossing depth is large, interfiber bond failure occurs. For example, when the embossing depth is 1 mm to 5 mm, interfiber bond failure is likely to occur. In the present invention, it may be rather preferable that interfiber bond failure occurs.

In the next step, water is supplied to the base paper sheet 20 on which the bulky portion 170 formed by a large number of uneven bodies 120 is formed (water impregnation step). The water supply means is performed by spraying water 510 onto the surface of the base paper sheet 20 from the nozzle of the spraying device. In this way, the base paper sheet 20 is impregnated with water supplied from the outer surface side of the base paper sheet 20. The water 510 may contain any material (for example, a water-soluble binder solution, an aqueous agent, a cross-linking agent, etc.). Water 510 may be sprayed on only one side of the base paper sheet 20 or on both the front and back sides. As a spray nozzle used for spraying, a one-fluid nozzle that ejects pressurized water 510 independently, or a mixture of compressed air and water 510, and the pressure of the compressed air is used to inject water 510 in a mist form. Any of the two-fluid nozzles can be used.

The means for supplying the water 510 is not limited to the above-mentioned spraying, and for example, a method of dropping the water 510 onto the surface of the base paper sheet 20, a method of applying the water 510, or the like may be adopted. Further, as will be described later, the present invention may have a step of impregnating the base paper sheet 20 having the bulky portion 170 with an aqueous agent and a step of impregnating the base paper sheet 20 with a cross-linking agent which is a compounding component of the aqueous agent. good. An aqueous chemical solution is supplied to the base paper sheet 20 in the aqueous chemical impregnation step, and a crosslinking agent solution is supplied to the base paper sheet 20 in the crosslinking agent impregnation step. As with the water supply means, any means such as a spraying method, a dropping method, and a coating method can be adopted. In the following description, a spraying method will be described as an example as a means of supplying them.

By supplying the water 510 described above, the base paper sheet 20 is impregnated with the water 510. Here, the production method of the present invention has an embodiment in which a part of the interfiber bond is broken in the base paper sheet 20 during embossing, and a water-soluble binder (for example, a water-soluble binder laminated on the base paper sheet 20 on a film (film)). A part of the binder) includes an embodiment in which the water-soluble binder is dissolved to cause destruction. When the interfiber bond is broken or the water-soluble binder is broken in the base paper sheet 20 in this way, the broken part of the fiber-to-fiber bond or the broken part of the water-soluble binder becomes a part where water 510 easily permeates. As a result, the permeation rate of water 510 is increased as a whole, and therefore, the permeation rate of water 510 is higher and the water 510 is efficiently permeated as compared with the case where the interfiber bond is not broken or the water-soluble binder is not broken. Can be made to. Further, when water 510 enters the place where the bond between the fibers is broken or the place where the water-soluble binder is broken, the fibers are bonded to each other via the dissolved water-soluble binder, and the bond between the fibers is strengthened. Become. That is, when the water-soluble binder is dried and formed into a film, the strength of the binder film is higher than the strength of the fibers, and therefore the strength of the water-melting paper can be improved. Further, when cross-linking is performed, the strength of the binder film is further increased.

Since the water 510 is supplied from the outer surface side of the base paper sheet 20, the surface of the base paper sheet 20 is also impregnated with the water 510. Water 510 is impregnated from one surface (supply surface) of the base paper sheet 20 over the opposite surface in the thickness direction (that is, over the entire layer in the thickness direction), and halfway (that is, not reaching the opposite surface). (To the middle of the thickness direction), but when impregnated over all layers in the thickness direction as in the former case, the surface of the water-dissolved paper is water-soluble on one side and the opposite side in the thickness direction. The sex binder is impregnated.

In supplying and impregnating the above-mentioned water 510, a cross-linking agent which is a compounding component of an aqueous agent may be supplied and impregnated in addition to the water 510. That is, in the present invention, the water impregnation step may include a step of impregnating both the water 510 and the cross-linking agent. As the first aspect of this embodiment, first, the base paper sheet 20 having the bulky portion 170 is impregnated with water 510 by spraying water 510 from the outer surface side of the base paper sheet 2, and then a cross-linking agent. The solution is sprayed to impregnate the base paper sheet 20 with the cross-linking agent. As the second aspect, first, the base paper sheet 20 is sprayed with a cross-linking agent solution from the outer surface side of the base paper sheet 20 to impregnate the cross-linking agent, and then water 510 is sprayed to spray water 510 on the base paper. The sheet 20 is impregnated. Further, in the third aspect, water 510 is sprayed on the base paper sheet 20 from the outer surface side thereof, and at the same time, a cross-linking agent solution is sprayed to simultaneously impregnate the water 510 and the cross-linking agent. .. In each of these embodiments, the cross-linking agent may be impregnated with the entire amount required for the formation of a cross-linking reaction with the water-soluble binder dissolved in water 510, or may be impregnated with a partial amount thereof. ..

The base paper sheet 20 impregnated with water 510 is sent to a dryer 610, where drying is performed. Examples of the drying means include electromagnetic wave drying, aeration drying (hot air drying), infrared drying, hot roll drying, and the like, but electromagnetic wave drying is preferable. Electromagnetic wave drying uses electromagnetic waves for drying, and as the electromagnetic wave dryer used for this, a device having the same mechanism and structure as a microwave oven can be used. The electromagnetic wave drying according to the present invention is performed by microwave heating, and when irradiated with microwaves, a vibrator connecting water molecules having polarity absorbs microwaves and vibrates and rotates, and the temperature rises, and this temperature rises. It is based on the principle of evaporating water and drying it.

Electromagnetic wave drying has the advantage that it can be dried in a short time, and has a high ability to transmit electromagnetic waves, and can be uniformly heated by penetrating into the inside of the base paper sheet 20 and heating, so that it can be uniformly dried. Furthermore, in electromagnetic wave drying, electromagnetic wave energy is directly loaded and there is no secondary energy consumption, so energy can be saved by at least 30% compared to infrared heating, and energy consumption can be reduced, thus reducing manufacturing costs. Can contribute. As the electromagnetic wave dryer used in the present invention, for example, one having an ability to dry 1 kg of water per 1 kW of electric power in 1 hour is preferable. Further, as the electromagnetic wave dryer installed in the continuous production facility, it is preferable to use a tunnel type electromagnetic wave dryer capable of continuously passing the base paper sheet 20 inside the dryer, which is suitable for continuous production.

Unlike aeration drying (hot air drying), electromagnetic wave drying does not have the possibility of crushing the uneven morphology of the uneven body 120 due to embossing due to wind pressure, and unlike hot roll drying, there is no possibility that the uneven morphology will be crushed by mechanical pressure.

Further, electromagnetic wave drying has an advantage that the drying efficiency is superior to that of aeration drying, infrared drying, and heat roll drying, and the drying can be performed in a short time, so that there is no risk of embossing returning, which reduces the height difference of embossing. This prevention of embossing return has an important meaning in the present invention. That is, since the present invention is to supply a water-soluble binder to the base paper sheet 20 after embossing and impregnate it, the impregnation of the water-soluble binder removes the strain due to embossing and the uneven shape of the concave-convex body 120 is broken. There's a problem. The selection of drying means is important for solving this problem. If electromagnetic wave drying is adopted as the drying means, the drying time can be significantly shortened as compared with other drying means, so that the moisture causing the embossing return can be quickly removed, and as a result, the uneven shape due to the distortion release can be obtained. It can suppress the collapse and maintain the shape of the uneven shape, and has the effect of suppressing the embossing return. In electromagnetic wave drying, as described above, since the electromagnetic wave permeates into the inside of the base paper sheet 20 and heats the base paper sheet 20, the base paper sheet 20 is uniformly heated and dried not only on the surface but also inside in a short time. Has a great effect on the above-mentioned effect of suppressing embossing return.

Infrared drying can also be suitably used as a means for drying the base paper sheet 20 impregnated with the water-soluble binder and water 510. Infrared rays have a wavelength band of 0.75 μm to 1000 μm, and are electromagnetic waves having a wavelength shorter than that of microwaves. Infrared rays are divided into near infrared rays (wavelength 0.7 μm to 2.5 μm) and far infrared rays (wavelength 4 μm to 1000 μm) depending on the wavelength. However, near infrared rays are not easily absorbed by an object and have low heating efficiency. It is preferable to use far infrared rays, which are easily absorbed by an object and have high heating efficiency. In the present invention, it is preferable to use far infrared rays having a wavelength of 4 μm to 50 μm among the wavelength bands of 4 μm to 1000 μm of far infrared rays. Far-infrared rays having a wavelength of 4 μm to 50 μm have high absorbance to water, and in the case of an object containing a large amount of water, most of the far-infrared rays are absorbed in a portion where the depth from the surface to the inside is relatively shallow. Therefore, when far-infrared drying is applied to the present invention, it has the effect of preventing the embossing from losing its shape. That is, when far infrared rays are radiated to the base paper sheet 20 impregnated with the water-soluble binder, a large amount of far infrared rays is absorbed from the surface of the base paper sheet 20 into a relatively shallow internal region, so that the vicinity of the surface is quickly heated. ,dry. As a result, the surface of the emboss is dried in a short time, and as a result, the shape of the emboss can be prevented from being lost due to the inclusion of water. In addition, by preventing the embossing from losing its shape, it is possible to prevent the embossing from returning, which reduces the height difference of the embossing. As described above, far-infrared drying has the advantage that the embossed surface can be quickly dried, so that the embossing can be reliably prevented from returning, and therefore the time required for the drying step can be shortened.

Far-infrared drying is not a method of warming the air to dry the object to be dried, but a method of directly transferring heat to the object to be dried by heat rays generated by far-infrared rays to dry the object, which is so-called radiant heat drying. Therefore, since the body to be dried can be efficiently heated, the drying time can be shortened. It is also possible to reflect heat rays in a specific direction with a reflector or the like and concentrate them at a predetermined position for heating and drying. If such a drying method is adopted, the energy efficiency for drying can be improved. It can be improved and the drying process cost can be reduced.

As the far-infrared dryer, any structure can be used as long as it is provided with a heating element that generates far-infrared rays, and in this case, a dryer capable of maintaining the temperature of the heating element at 200 ° C. or higher is preferable. By keeping the temperature of the heating element at 200 ° C. or higher, far infrared rays can be efficiently generated. Further, if the power is intermittently energized by a thermostat or the like, power saving operation becomes possible. In far-infrared drying, there is no load due to wind pressure unlike aeration drying (hot air drying), and there is no load due to mechanical pressure unlike hot roll drying, so the embossed uneven shape is crushed and the base paper sheet 20 is distorted. There is no risk of occurrence.

When the base paper sheet 20 impregnated with the water-soluble binder and water 510 is dried by the dryer 610, the present invention is not limited to the case where the base paper sheet 20 is dried by one dryer, and a plurality of dryers are installed in sequence. The base paper sheet 20 may be fed to each dryer for drying. That is, for example, the base paper sheet 20 transferred by the belt conveyor may be sent to the first dryer for drying, and then sent to the second dryer, where the second drying may be performed. In this case, the degree of drying can be different between the first-stage drying and the second-stage drying. Such multi-stage drying is particularly useful in electromagnetic wave drying and infrared drying. The present invention can also combine electromagnetic wave drying and infrared drying. That is, an electromagnetic wave dryer and an infrared dryer are installed respectively. For example, the base paper sheet 20 is first sent to the electromagnetic wave dryer for electromagnetic wave drying, and then the base paper sheet 20 is sent to the infrared dryer for infrared drying. Alternatively, the order may be reversed so that infrared drying is first performed and then electromagnetic wave drying is performed. Further, the electromagnetic wave drying (or infrared drying) of the first stage drying and the infrared drying (or electromagnetic wave drying) of the second stage drying may be alternately repeated several times. Further, an electromagnetic wave heating mechanism and an infrared heating mechanism are provided in one dryer, and the base paper sheet 20 is sent to the dryer having such a structure, where the base paper sheet 20 is heated by electromagnetic waves and at the same time heated by infrared rays, and dried by electromagnetic waves and infrared rays. It is also possible to perform drying by the same time.

The base paper sheet 20 dried by the dryer 610 is sequentially sent to a folding step, a cutting step, and an aqueous chemical impregnation step.

Here, as another embodiment of the present invention, the base paper sheet 20 having the bulky portion 170 is impregnated with the water-soluble binder and water 510, and then the base paper sheet 20 is impregnated with the water-soluble binder and water 510. Is dried by a dryer 610 (electromagnetic wave drying, far infrared drying, etc.) as described above, and then the dried base paper sheet 20 is impregnated with a cross-linking agent, and the base paper sheet 20 impregnated with this cross-linking agent is further used. It may be passed through a dryer, where it may be weakly dried and then sent to the folding process. If the base paper sheet 2 is completely dried by the dryer 610 and then folded, cracks may occur in the folds. However, according to the present embodiment, the drying performed immediately before the folding step is not completely dried but weakly dried (weak drying). For example, since it is semi-dried), there is no possibility that cracks will occur in the folds when folded.

In the present invention, if the degree of drying by the dryer 610 is adjusted, the above-mentioned problem of cracking does not occur, and there is no problem in folding the base paper sheet 20 after drying it by the dryer 610. As described above, the dried base paper sheet 20 is sequentially sent to the folding step, the cutting step, and the aqueous chemical impregnation step. In the aqueous chemical impregnation step, a composition solution containing water, a cross-linking agent, a water-soluble organic solvent, a surfactant and the like is supplied to the folded body of the base paper sheet 20 to be impregnated, but as another embodiment of the present invention. The cross-linking agent, which is a compounding component of the aqueous agent, may be separated from the other compounding components of the aqueous agent, and only the cross-linking agent may be supplied to the base paper sheet 20 at a stage before the folding step to be impregnated. Hereinafter, this embodiment will be described.

The cross-linking agent solution is sprayed and supplied to the base paper sheet 20 that has completed the drying step. For example, an aqueous zinc sulfate solution is used as the cross-linking agent solution.

The amount of the cross-linking agent solution supplied (added) to the base paper sheet 20 is such that the metal ions (for example, zinc ions) cause a sufficient cross-linking reaction with the carboxyl group in the water-soluble binder impregnated in the base paper sheet 20. Although it is a required amount, in the present invention, the addition amount is preferably 1/3 mol or more, and more preferably 1/2 mol or more with respect to 1 mol of the carboxyl group.

By spraying the cross-linking agent solution onto the base paper sheet 20, the base paper sheet 20 is impregnated with the cross-linking agent, a cross-linking reaction occurs with the water-soluble binder in the base paper sheet 20, and the water-soluble binder has a cross-linked structure. The strength of 20 is improved.

After the cross-linking agent impregnation step is completed, the base paper sheet 20 is guided to the folding machine 800 and folded at a predetermined number of times. For example, fold it in half from the center, make perforations at predetermined intervals, fold this double fold in half around the perforation to make a quadruple, and fold this quadruple in half from the center. Fold it in eight. As another folding method, the base paper sheet 20 may be continuously folded alternately and perforated at predetermined intervals so that fold lines are continuously formed along the longitudinal direction.

After the folding step, it is cut to a predetermined size to obtain a folded body 900 of the base paper sheet 20. Next, the foldable body 900 is sprayed with the aqueous chemical solution 1000 containing no cross-linking agent, and the foldable body 900 is subjected to an aqueous agent containing no cross-linking agent (hereinafter, the aqueous agent containing no cross-linking agent is referred to as a cross-linking agent-free aqueous agent). Impregnated. As the cross-linking agent-free water-free agent, a compound containing water, a water-soluble organic solvent, a surfactant, a bactericide, a preservative, a deodorant, a fragrance and the like is used.

It is sufficient to supply the cross-linking agent-free water-free agent so as to be impregnated with 50% by weight to 200% by weight, preferably 130% by weight to 150% by weight, based on the weight of the base paper sheet 20 in the folded body 900. It is preferable to exert the above.

In this way, a hydrolyzed paper impregnated with an aqueous agent can be obtained. The water-melting paper produced by the present invention is a concept that means not only a folded shape (folded body) but also a flat sheet body in an unfolded state. A plurality of bundles of the folded water-dissolved paper are packed in a sealed bag, thereby obtaining a product 1100 used for a toilet cleaner, a wiper, and the like.

In the above embodiment, the folding body 900 is not limited to being impregnated with the cross-linking agent water-free agent before packing the folded body 900, and the folded body 900 is temporarily stored in a sealed bag, and the opening of the bag entrance in this stored state. The cross-linking agent-free water-free agent solution may be sprayed and supplied through the portion to impregnate the folding body 900 with the cross-linking agent water-free agent.

In the above-described embodiment, as a step of impregnating the base paper sheet with an aqueous agent, a step of impregnating the base paper sheet with a cross-linking agent which is a compounding component of the water-based agent and a step of impregnating the base paper sheet with an aqueous agent containing no cross-linking agent. However, as another embodiment of the present invention, the cross-linking agent may not be impregnated at the stage before the folding step, but may be impregnated with the cross-linking agent after the folding step. In this case, the aqueous chemical solution containing the cross-linking agent is sprayed onto the folded body 900 to impregnate the folded body 900 with the aqueous chemical containing the cross-linking agent.

In the embodiment of impregnating the folded body 900 with the aqueous agent containing the cross-linking agent, the supply amount of the cross-linking agent to the folded body 900 and the supply amount of the aqueous agent composition component other than the cross-linking agent component are the above-mentioned embodiments (before the folding step). It is preferable that the same is true for the case of impregnation with the cross-linking agent and impregnation with the water-free cross-linking agent after the folding step).

In the present invention, of the above two embodiments, the embodiment in which the base paper sheet 20 is impregnated with the cross-linking agent before the folding step is preferable. The reason is as follows.

That is, in the embodiment in which the folded body 900 is impregnated with the aqueous chemical containing the cross-linking agent after the folding step, a plurality of the folded bodies 900 are arranged in an upright posture, and in this state, the aqueous chemical solution is sprayed and supplied from above. be. Therefore, the aqueous agent supplied by spraying is impregnated from the peripheral portion of the folded body 900, and the impregnation distribution gradually spreads toward the central portion. Since there is such a difference in the progress of impregnation, first, a cross-linking reaction occurs from the peripheral portion, and the cross-linking agent which is a compounding component of the aqueous agent is preferentially consumed in the cross-linking reaction in the peripheral portion. Therefore, in the process of impregnating the aqueous agent toward the central portion, the concentration of the cross-linking agent gradually decreases, which causes a phenomenon that the concentration of the cross-linking agent is low and the degree of cross-linking also decreases in the central portion. As a result, the degree of cross-linking in the central portion is smaller than the degree of cross-linking in the peripheral portion, and the physical strength in the central portion is smaller than the physical strength in the peripheral portion, resulting in a variation in strength.

On the other hand, in the embodiment of spraying and impregnating the base paper sheet 20 with the cross-linking agent solution before the folding step, the cross-linking agent solution is sprayed and supplied from above toward the surface of the base paper sheet 20. Therefore, the cross-linking agent solution can be uniformly sprayed on the sheet surface, and the cross-linking agent is uniformly impregnated in the thickness direction of the base paper sheet 20. As a result, the so-called cross-linking variation in which the degree of cross-linking differs between the peripheral portion and the central portion as described above does not occur, a uniform degree of cross-linking can be obtained over the entire base paper sheet 20, and uniform physics is obtained over the entire sheet. There is an advantage that the target strength can be obtained. Therefore, the folded body 900 obtained by folding the base paper sheet 20 also has uniform physical strength. For this reason, it can be said that the embodiment of impregnation with a cross-linking agent before the folding step is preferable.

When the base paper sheet 20 is not impregnated with the cross-linking agent before the folding step and the folded body 900 is impregnated with the aqueous agent containing the cross-linking agent after the folding step, the water-based product containing the cross-linking agent is contained from above the folded body 900 in the standing posture. It is preferable to adopt a supply method in which the chemical solution is sprayed, then the standing posture is reversed and arranged in the opposite posture, and the aqueous chemical solution is sprayed again from above in this state. Further, as another supply method, the aqueous chemical solution may be sprayed from both the left and right directions of the folded body 900 in the upright posture. According to these supply methods, an aqueous agent containing a cross-linking agent can be uniformly impregnated, and variations in cross-linking can be prevented.

As described above, as a step of impregnating the base paper sheet with the aqueous agent, a step of impregnating the base paper sheet with a cross-linking agent which is a compounding component of the aqueous agent (hereinafter referred to as step A) before the folding step and a step of impregnating the base paper after the folding step. The embodiment of the present invention is described in which the sheet is impregnated with an aqueous agent (hereinafter referred to as step B) of an aqueous agent having a composition other than the cross-linking agent component (hereinafter referred to as step B). Although it is a preferred embodiment, in this embodiment, when the cross-linking agent solution is supplied to the base paper sheet before the folding step, the cross-linking agent solution contains an aqueous chemical solution having a composition other than the cross-linking agent component (no cross-linking agent). A mixed solution mixed with the aqueous chemical solution) may be supplied to the base paper sheet. In this case, the amount of the cross-linking agent in the cross-linking agent solution is a part of the total amount of the cross-linking agent used in step A (for example, 80% of the total amount), and the cross-linking agent in the water-free chemical solution of the cross-linking agent is used. As the amount of the water-free agent, a part of the total amount of the aqueous agent used in the step B (for example, 20% of the total amount) is used. Then, in step B after the folding step, when the cross-linking agent-free water-free chemical solution is supplied to the base paper sheet, a mixed solution obtained by mixing the cross-linking agent-free water-containing drug solution with the cross-linking agent solution is supplied to the base paper sheet. In this case, the amount of the cross-linking agent-free chemical in the cross-linking agent-free chemical solution is the amount of the remainder of the total amount of the cross-linking agent-free chemical used in step B (for example, 80% of the total amount). As the amount of the cross-linking agent in the cross-linking agent solution, the amount of the balance of the total amount of the cross-linking agent used in the step A (for example, 20% of the total amount) is used.

Further, in the above embodiment, the total amount (100%) of the cross-linking agent is used in the step A, and the amount of the cross-linking agent-free water-free agent is used in the step B, which is a part of the total amount of the cross-linking agent-free water-containing agent (for example). A mixed solution of these cross-linking agent solutions and the cross-linking agent non-aqueous chemical solution is supplied to the base paper sheet using an amount (20% of the total amount). On the other hand, in step B, the amount of the cross-linking agent-free agent is used as the balance of the total amount of the cross-linking agent-free agent used in step B (for example, 80% of the total amount), and this cross-linking agent-free agent is used. The solution may be supplied to the base paper sheet. Further, in the step A, the amount of the cross-linking agent is a part of the total amount of the cross-linking agent used in the step A (for example, 80% of the total amount), and this cross-linking agent solution is supplied to the base paper sheet, and in the step B. , The total amount (100%) of the cross-linking agent-free water-free agent is used, and the remaining amount of the total amount of the cross-linking agent used in step A (for example, 20% of the total amount) is used. A mixed solution of the sex agent solution and the cross-linking agent solution may be supplied to the base paper sheet.

As shown in FIGS. 2 and 3, the hydrolyzed paper produced as described above has a concavo-convex body 120 having a large number of convex portions 130 and concave portions 140 formed uniformly over the entire surface thereof by embossing. And, the bulky portion 17 is formed by the uneven body 120, whereby the hydrolyzed paper is configured as a bulky paper. A large number of convex portions 130 are linearly arranged along the transport direction (Z direction in FIG. 2) of the base paper sheet 20 in the manufacturing process, whereby a convex portion row 150 is formed, and a large number of concave portions 140 are formed. They are aligned linearly along the Z direction, thereby forming a recess row 160. The convex row 150 and the concave row 160 are configured by a pattern in which they are alternately and repeatedly arranged along a direction orthogonal to the Z direction.

In the hydrolyzed paper produced by the present invention, the shapes of the convex portions 130 and the concave portions 140 in the concave-convex body 120 are arbitrary and are not limited to the circular shape as shown in FIG. 2, but may be elliptical, triangular, quadrangular, rhombic or the like. It may be a pattern such as an irregular pattern or a floral pattern.

The hydrolyzed paper produced by the present invention contains a water-soluble binder having a crosslinked structure. When electromagnetic wave drying is performed in the manufacturing process, the hydrolyzed paper is in the form of containing a water-soluble binder that has been subjected to electromagnetic wave drying treatment. Further, when far-infrared ray drying is performed in the manufacturing process, the hydrolyzed paper is in the form of containing a water-soluble binder subjected to the far-infrared ray drying treatment. In the present invention, since the water-soluble binder is supplied from the outer surface side of the base paper sheet, the impregnated region of the water-soluble binder also includes the surface of the water-dissolved paper. Therefore, the surface of the water-dissolved paper is also impregnated with the water-soluble binder, which imparts the necessary strength to the surface of the water-dissolved paper. After that, there is no possibility that paper dust remains on the dry surface, and the generation of paper dust can be prevented.

The water-melting paper produced by the present invention can be used as a cleaning product for cleaning a toilet bowl in a toilet, a cleaning product around the toilet, a wiper, or the like. The hydrolyzed paper produced by the present invention has a predetermined strength in a wet state, does not tear during use, has an excellent usability, and after use, is quickly hydrolyzed by flowing into a toilet bowl and is a sewer pipe. There is no risk of clogging, and it is excellent in both strength and water solubility.

The embodiments according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

Further, the effects described in the present specification are merely exemplary and not limited, and other effects may be obtained.

In addition, the present invention can also have the following configuration.
[1]
Using a base paper sheet impregnated with a water-soluble binder,
An embossing process in which the base paper sheet is embossed to form a bulky portion due to a large number of uneven bodies on the base paper sheet.
After the embossing step, a water impregnation step of supplying water to the base paper sheet from the outer surface side and impregnating the base paper sheet with the water.
After the water impregnation step, a drying step of drying the base paper sheet and a drying step
After the drying step, a folding step of folding the base paper sheet and a folding step of folding the base paper sheet,
A method for producing a hydrolyzed paper, comprising: a water-based agent impregnation step of supplying an aqueous agent to the base paper sheet and impregnating the base paper sheet with the aqueous agent.
[2]
The method for producing a hydrolyzed paper according to [1], wherein the base paper sheet is impregnated with a cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure before the folding step.
[3]
The cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure is used in the first drying step following the impregnation of the base paper sheet with the water-soluble binder in the binder impregnation step. The method for producing a water-dissolved paper according to [1] or [2], which is impregnated in the base paper sheet before.

20 ... Base paper sheet,
510 ... water,
1000 ... Aqueous chemical solution,
120 ... Concavo-convex body,
170 ... Bulky part.

Claims (3)

Using a base paper sheet impregnated with a water-soluble binder,
An embossing process in which the base paper sheet is embossed to form a bulky portion due to a large number of uneven bodies on the base paper sheet.
After the embossing step, a water impregnation step of supplying water to the base paper sheet from the outer surface side and impregnating the base paper sheet with the water.
After the water impregnation step, a drying step of drying the base paper sheet and a drying step
After the drying step, a folding step of folding the base paper sheet and a folding step of folding the base paper sheet,
A method for producing a hydrolyzed paper, comprising: a water-based agent impregnation step of supplying an aqueous agent to the base paper sheet and impregnating the base paper sheet with the aqueous agent. A cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure is used.
The method for producing a hydrolyzed paper according to claim 1, wherein the base paper sheet is impregnated before the folding step. A cross-linking agent that causes a cross-linking reaction with the water-soluble binder to form the water-soluble binder into a cross-linking structure is used.
The method for producing a hydrolyzed paper according to claim 1 or 2 , wherein the base paper sheet impregnated with the water-soluble binder is impregnated before the drying step.

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