Low-energy-consumption and high-efficiency all-cotton spunlace non-woven fabric dewatering and bleaching method

Abstract

The invention discloses a low-energy-consumption and high-efficiency all-cotton spunlace non-woven fabric dewatering and bleaching method. The method comprises the following steps: 1, mixing a sodium dodecyl benzene sulfonate solution and a free radical scavenging solution to obtain an impregnation liquid; 2, placing the all-cotton spunlace non-woven fabric in the steeping liquor, then setting ultrasonic frequency, and waiting for 3-5 minutes; 3, controlling the liquid carrying rate of the all-cotton spunlace non-woven fabric, oxidizing the all-cotton spunlace non-woven fabric with ozone, and waiting for 8-10 minutes; 4, placing the all-cotton spunlace non-woven fabric in the impregnation liquid, setting ultrasonic frequency, and waiting for 1-2 minutes; 5, controlling the liquid carrying rate of the all-cotton spunlaced non-woven fabric, oxidizing the all-cotton spunlaced non-woven fabric with ozone, and waiting for 3-5 minutes; 6, carrying out other steps; dewatering and bleaching can be completed only in half an hour, so that the treatment time is short; the reaction can be carried out at room temperature without heating, so that the energy consumption is low. Therefore, according to the design, the treatment time is short, and the energy consumption is low.

Description

Technical Field

[0001] The invention relates to a de-bleaching method, belongs to the field of all-cotton spunlace nonwoven fabric processing, and particularly relates to a low-energy-consumption and high-efficiency de-bleaching method for all-cotton spunlace nonwoven fabric. Background Art

[0002] The cotton spunlace nonwoven material has become one of the most popular materials in the nonwoven industry today because of its skin-friendly and comfortable characteristics, good hand feel, strong water absorption, good moisturizing performance, low lint, no static electricity, no allergy, 100% natural decomposition, and ecological environmental protection. In the production process of cotton spunlace nonwovens, a de-bleaching process is included to ensure that the whiteness and hygroscopicity of cotton spunlace nonwoven products meet the market product demand; the de-bleaching technology of cotton spunlace nonwovens is mostly high-temperature alkaline oxygen technology in industrial application. This technology requires the treatment of cotton spunlace nonwovens in a high-temperature strong alkaline environment. It has the characteristics of high efficiency and short process flow, but it also has the problems of high energy consumption and difficulty in wastewater treatment.

[0003] The Chinese patent application number is 201810488053.0, and the application date is May 21, 2018. It discloses a method for pre-treating cotton fabric by hydrogen peroxide and ozone descaling and bleaching in one bath, which includes the following steps: impregnation with an impregnation liquid, hot water washing, cold water washing, and dehydration; wherein the impregnation liquid is composed of 30% hydrogen peroxide with a dosage of 1.5g / L-10.5g / L, non-ionic surfactant 1-5g / L; ozone 0.05g / L-1.0g / L; the impregnation conditions are impregnation liquid pH 3-10; impregnation temperature 10-40℃; bath ratio 1:5-1:15; time 50min; hot water washing is washing with warm water at 60-80℃ to remove impurities remaining on the fabric after being decomposed by hydrogen peroxide and ozone. Although the hydrogen peroxide / ozone pre-treatment of this design is carried out at room temperature, which can reduce energy consumption, it still has the following defects: The overall processing time of this design is long and the production efficiency is low.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems of the prior art in that the processing time is long, and to provide a method for debleaching and bleaching all-cotton spunlace nonwoven fabrics with short processing time, low energy consumption and high efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is: A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabrics, the method comprising the following steps: The first step is to prepare a sodium dodecylbenzene sulfonate solution of a specified concentration, and then prepare a free radical scavenging solution of a specified concentration, and then evenly mix the sodium dodecylbenzene sulfonate solution and the free radical scavenging solution to obtain an impregnation solution, and then pass the impregnation solution into an ultrasonic-assisted impregnation reaction chamber; Step 2: first take out the cotton spunlace nonwoven fabric that has undergone the spunlace step, then place the cotton spunlace nonwoven fabric on a conveying roller, and then use the conveying roller to convey the cotton spunlace nonwoven fabric into the impregnation solution, then set the specified ultrasonic frequency, and then set the specified reaction temperature. At this time, the sodium dodecylbenzene sulfonate solution is used as a penetrant under the assistance of ultrasound to increase the rate at which water enters the interior of the cotton fiber of the cotton spunlace nonwoven fabric. At the same time, the sodium dodecylbenzene sulfonate solution removes protein dirt and oily dirt on the surface of the cotton spunlace nonwoven fabric under the assistance of ultrasound to achieve a degreasing effect. At this time, free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric, and then wait for three to five minutes; Step 3: First, squeeze the cotton spunlace nonwoven fabric through a pressing roller to make the liquid carrying rate of the cotton spunlace nonwoven fabric a specified value; then, the cotton spunlace nonwoven fabric is conveyed to an ozone reaction chamber of a specified concentration through a conveying roller. At this time, ozone enters the interior of the cotton spunlace nonwoven fabric under the action of water, and then ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric to achieve a bleaching effect. The free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form protection for the cotton fibers, and then wait for eight to ten minutes; Step 4: First, transfer the cotton spunlace nonwoven fabric to the impregnation liquid through the transfer roller, then set the specified ultrasonic frequency, and then set the specified reaction temperature. At this time, water enters the interior of the cotton fiber of the cotton spunlace nonwoven fabric, and the free radical scavenging molecules attach to the cotton spunlace nonwoven fabric, and then wait for one to two minutes; Step 5: First, squeeze the cotton spunlace nonwoven fabric through a pressing roller to make the liquid carrying rate of the cotton spunlace nonwoven fabric a specified value; then use a conveying roller to convey the cotton spunlace nonwoven fabric to an ozone reaction chamber of a specified concentration. At this time, ozone enters deeper into the cotton spunlace nonwoven fabric under the action of water, and then ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric to achieve a bleaching effect. The free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form protection for the cotton fibers, and then wait for three to five minutes; Step 6: First, the cotton spunlace nonwoven fabric is conveyed to the outside of the ozone reaction chamber by a conveying roller, and then the cotton spunlace nonwoven fabric is rinsed and dried into a roll in sequence.

[0007] In the first step, the preparation of a free radical scavenging solution of a specified concentration is the preparation of an alcohol, carboxylic acid or amide free radical scavenging solution of a specified concentration.

[0008] In the first step, the step of preparing a free radical scavenging solution of a specified concentration is preparing a methanol solution of a specified concentration.

[0009] The preparation of the sodium dodecylbenzene sulfonate solution of the specified concentration is to prepare a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter, and the preparation of the methanol solution of the specified concentration is to prepare a methanol solution of 15 to 30 percent.

[0010] In the second step, the setting of the specified ultrasonic frequency is to set the ultrasonic frequency to thirty-eight to forty-three kilohertz, and the setting of the specified reaction temperature is to set the reaction temperature to fifteen to thirty-five degrees Celsius.

[0011] In the second step, setting the ultrasonic frequency of thirty-eight to forty-three kilohertz is setting the ultrasonic frequency of forty kilohertz, and setting the reaction temperature of fifteen to thirty-five degrees Celsius is setting the reaction temperature of thirty degrees Celsius.

[0012] In the third step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric is set to a specified value, that is, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric is 65 to 70 percent, and the conveying of the 100% cotton spunlace nonwoven fabric to an ozone reaction chamber with a specified concentration by a conveying roller is to convey the 100% cotton spunlace nonwoven fabric to an ozone reaction chamber with an ozone concentration of 20 to 30 grams per liter by a conveying roller.

[0013] In the third step, the liquid carrying rate of the cotton spunlace nonwoven fabric is 65-70%, and the ozone reaction chamber with an ozone concentration of 20-30 grams per liter is an ozone reaction chamber with an ozone concentration of 24 grams per liter.

[0014] In the fourth step, the specified ultrasonic frequency is set to an ultrasonic frequency of thirty-eight to forty-three kilohertz, and the specified reaction temperature is set to a reaction temperature of fifteen to thirty-five degrees Celsius.

[0015] In the fifth step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric is a specified value of ninety percent of the liquid carrying rate of the 100% cotton spunlace nonwoven fabric, and the step of conveying the 100% cotton spunlace nonwoven fabric to an ozone reaction chamber with a specified concentration by means of a conveying roller is to convey the 100% cotton spunlace nonwoven fabric to an ozone reaction chamber with an ozone concentration of twenty to thirty grams per liter by means of a conveying roller.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabrics of the present invention, the method comprises the following steps: the first step: firstly prepare a sodium dodecylbenzene sulfonate solution and a free radical scavenging solution, then mix them to obtain an impregnation liquid, and then pass the impregnation liquid into an ultrasonic-assisted impregnation reaction chamber; the second step: make the all-cotton spunlace nonwoven fabric inside the impregnation liquid, and then set the ultrasonic frequency and reaction temperature. At this time, the sodium dodecylbenzene sulfonate increases the rate at which water enters the cotton fibers of the all-cotton spunlace nonwoven fabric, and the water is used for the subsequent auxiliary ozone reaction. At the same time, the sodium dodecylbenzene sulfonate removes protein dirt and oily dirt from the all-cotton spunlace nonwoven fabric to achieve a degreasing effect, and the free radical scavenging molecules are attached to the all-cotton spunlace nonwoven fabric to form protection for the cotton fibers, and then wait for three to five minutes; the third step: firstly control the liquid carrying rate of the all-cotton spunlace nonwoven fabric, and then transfer the all-cotton spunlace nonwoven fabric to the ozone reaction chamber. At this time, ozone enters the all-cotton spunlace nonwoven fabric under the action of water. The inside of the cotton spunlace nonwoven fabric is used to remove pectin, wax and pigment in the cotton spunlace nonwoven fabric, thereby achieving a bleaching effect. The free radical scavenger molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form protection for the cotton fibers, and then wait for eight to ten minutes; the fourth step: the cotton spunlace nonwoven fabric is transferred to the impregnation liquid, and then the ultrasonic frequency and reaction temperature are set. At this time, water enters the cotton fibers of the cotton spunlace nonwoven fabric to assist the subsequent ozone reaction, and the free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric to form protection for the cotton fibers, and then wait for one to two minutes; the fifth step: first control the liquid carrying rate of the cotton spunlace nonwoven fabric, and then transfer the cotton spunlace nonwoven fabric to the ozone reaction chamber, and then bleach the cotton spunlace nonwoven fabric by ozone, and then wait for three to five minutes; the sixth step: transfer the cotton spunlace nonwoven fabric to the outside of the ozone reaction chamber, and then perform rinsing and drying steps to form a roll. The advantages of the present invention also include: First point: Compared with the prior art, the present invention uses ozone for bleaching. Due to the high oxidation potential of ozone (2.07V), which is about twice that of hydrogen peroxide, ozone can oxidize impurities on the surface of cotton fibers more quickly, so the de-bleaching treatment time can be effectively shortened to less than half an hour, thereby improving production efficiency; Second point: In the traditional high-temperature alkaline oxygen technology, electric energy is needed to heat the aqueous solution in the water tank to 80-90 degrees Celsius, so the temperature increase is relatively high, and the aqueous solution has a large mass and a large specific heat capacity, so the consumption of electric energy is high, which also makes the production cost high; in the present invention, the cotton spunlace nonwoven fabric is treated with gas phase ozone at room temperature, and there is no need to heat the aqueous solution, so the energy consumption is relatively low; Third point: In the prior art, the existing treatment technology is mostly high-temperature alkaline oxygen bleaching, in which hydrogen peroxide alone has a poor bleaching effect and needs to be in strong alkaline conditions to produce a good oxidation effect. Therefore, the COD value of the wastewater produced by this technology is high, and the wastewater treatment is difficult; in the present invention, ozone also has the characteristics of being active at room temperature and having no by-products, and is an efficient and green alternative bleaching agent. The reaction conditions of ozone bleaching are mild, water consumption is low, and a large amount of chemical substances are not required. The wastewater treatment cost is low, so the production cost is reduced, and due to the extremely high oxidizing property of ozone, it will decompose into oxygen when discharged into the air, so it will not pollute the environment; in the present invention, the amount of chemical agents used is small, the COD value of the free radical scavenging solution (such as methanol solution) is low, the difficulty of wastewater treatment is also small, and the utilization rate of the impregnation liquid is high (that is, the impregnation liquid can be used multiple times), the recovery rate is high, and the energy consumption of wastewater treatment is greatly saved; Fourth point: In the present invention, the cavitation effect of ultrasound is utilized, that is, the microbubbles in the liquid vibrate under the action of ultrasound. When the sound pressure reaches a certain value, a part of the bubbles grow rapidly in the negative pressure period and suddenly close in the positive pressure period. When the microbubbles burst, local high temperature and strong impact pressure will be generated. Therefore, the impurities on the surface of the cotton spunlace nonwoven fabric will be subjected to about 20,000 violent impacts per second, and the surface hydrophobic impurities can be effectively removed; on the other hand, ultrasound-assisted impregnation can accelerate molecular movement, so that the efficiency of water entering the cotton fiber is improved, and the water can reach the deeper level of the cotton fiber, thereby assisting ozone to enter the deeper level of the cotton fiber, improving the mass transfer efficiency of ozone, effectively improving the efficiency of gas-phase ozone reaction, and reducing energy consumption; Fifth point: The present invention adopts ultrasonic padding ozone treatment technology. Ozone can be dissolved in water under certain conditions, and generate active oxygen and strong oxidizing substances such as hydrogen peroxide in water, and then react with many unsaturated organic substances, so that the conjugated system in the organic matter is destroyed and peroxides are generated. The peroxides will continue to decompose due to their instability, and finally generate hydrophilic substances soluble in water; ozone generates a large number of highly active free radicals in the reaction, and these free radicals will break the ester bonds of oils and waxes on cotton fabrics, and can cut off the molecular chains of pectin, thereby removing pectin from the fibers; in addition, the natural pigments on the cotton fibers will also be affected by these free radicals, and the color-developing groups of the pigments will be destroyed, thereby achieving decolorization. Effect; Since the oxidizing property of ozone is non-selective, it will also destroy the cellulose of cotton fibers while treating impurities, which will cause the strength of the all-cotton spunlace nonwoven fabric to decrease. Therefore, the present invention uses a free radical scavenging solution to react with the free radicals generated by ozone to remove the free radicals, so as to prevent the free radicals from destroying the cotton fiber structure, so that the strength loss rate of the all-cotton spunlace nonwoven fabric meets the requirements; In a liquid environment, ozone needs to be dissolved in a large amount of liquid environment to play a role. In the present invention, ozone is debleached in a gas phase environment, and only the liquid film (water molecules) dissolved on the fiber surface can react with impurities. Therefore, the mass transfer efficiency of ozone is high, and the oxidation effect of ozone is good, so the whiteness of the all-cotton spunlace nonwoven fabric can also be significantly improved; Therefore, the present invention has a shorter processing time and lower energy consumption.

[0017] 2. In the low-energy consumption and high-efficiency debleaching method of all-cotton spunlace nonwoven fabric of the present invention, in the first step, the free radical scavenging solution is an alcohol, carboxylic acid or amide free radical scavenging solution, preferably a methanol solution, the concentration of the methanol solution is 15% to 30%, and the concentration of the sodium dodecylbenzene sulfonate solution is 0.4 to 0.6 grams per liter. When used, sodium dodecylbenzene sulfonate is a synthetic anionic surfactant with excellent performance, which is easily soluble in water, has good degreasing ability, strong foaming power, and has good properties of reducing the surface tension of water and wetting, penetration and emulsification. It has stable chemical properties and can be used in acidic or alkaline media. It will not decompose under the conditions of heating, and sodium dodecylbenzene sulfonate has a significant decontamination effect on particulate dirt, protein dirt and oily dirt, and is particularly good at washing particulate dirt on natural fibers. Among the anionic surfactants, it is most suitable for ozone treatment of cotton fibers; the cotton spunlace nonwoven fabric treated with 0.4 to 0.6 grams per liter of sodium dodecylbenzene sulfonate solution can have the best performance, and 15 to 30 percent methanol solution can eliminate and reduce the hydroxyl radicals generated by ozone, thereby reducing the degradation of carbohydrates, so it can fully protect the cellulose in the cotton fiber, so that the strength of the cotton spunlace nonwoven fabric meets the requirements. Therefore, the degreasing effect of the present invention is better.

[0018] 3. In the present invention, a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, in the second step, the ultrasonic frequency is 40 kHz, and the reaction temperature is 30 degrees Celsius. When applied, when the ultrasonic frequency is 40 kHz, the effect of ultrasonic cavitation effect is better, and the surface impurities of the all-cotton spunlace nonwoven fabric can be effectively removed, and the effect of introducing water into the cotton fiber is also better, so the mass transfer efficiency of ozone can be improved; the reaction temperature is 30 degrees Celsius, at this time, the molecular thermal motion speed is faster, and the bleaching effect is better; the immersion time of the second step is three to five minutes, at this time, it is enough for sodium dodecylbenzene sulfonate to remove the protein and oily dirt of the all-cotton spunlace nonwoven fabric, and water can also fully enter the cotton fiber, which is conducive to improving the mass transfer efficiency of ozone, and the free radical scavenging solution can also adhere to the all-cotton spunlace nonwoven fabric. Therefore, the immersion effect of the present invention is better.

[0019] 4. In the present invention, a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, in the third step, the liquid carrying rate of the all-cotton spunlace nonwoven fabric is 65-70%, and the ozone concentration is 20-30 grams per liter. When used, the squeezing force of the pressing roller on the all-cotton spunlace nonwoven fabric is controlled by controlling the spacing between the pressing rollers, thereby realizing the control of the liquid carrying rate of the all-cotton spunlace nonwoven fabric. When the liquid carrying rate is 70%, sufficient water enters the cotton fiber of the all-cotton spunlace nonwoven fabric. Sufficient water increases the contact area between ozone and cotton fiber, thereby improving the mass transfer efficiency of ozone. When the concentration of ozone is 20-30 grams per liter, the impurities contained in the bleached cotton fiber can be quickly debleached, and the strength of the cotton fiber can be guaranteed to meet the requirements; in the third step, the ozone treatment time is eight to ten minutes, at which time, the whiteness of the cotton fiber can meet the requirements, and the strength of the cotton fiber meets the requirements. Therefore, the fiber strength of the present invention is better.

[0020] 5. In the present invention, a low-energy and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, in the fourth step, the ultrasonic frequency is 38 to 43 kilohertz, and the response temperature is 15 to 35 degrees Celsius. When applied, the all-cotton spunlace nonwoven fabric is impregnated again to allow water to enter the cotton fiber of the all-cotton spunlace nonwoven fabric, which helps to improve the mass transfer efficiency of ozone. At the same time, free radical scavengers are also added to prevent the cotton fiber from being damaged in the next step; the impregnation time of the fourth step is one to two minutes. After the ozone treatment in the third step, the hydrophobic impurities on the surface of the cotton fiber are removed, and the impregnation efficiency will be improved, so this time is enough for water to enter the cotton fiber. Therefore, the water introduction effect of the present invention is better.

[0021] 6. In the present invention, a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, in the fifth step, the liquid carrying rate of the all-cotton spunlace nonwoven fabric is 90%, and the ozone concentration is 20 to 30 grams per liter. When used, the liquid carrying rate of the all-cotton spunlace nonwoven fabric is increased, and the water can enter the deep inside of the cotton fiber. Because the ozone reacts with the cotton fiber and dissolves in the water, the ozone can also enter the deep inside of the cotton fiber to react, thereby improving the mass transfer efficiency of the ozone; in the fifth step, the ozone treatment time is three to five minutes, because more impurities have been removed in the third step, so the ozone reaction time is shortened. Therefore, the mass transfer efficiency of the ozone in the present invention is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the present invention.

[0023] Figure 2 It is a schematic diagram of the application of the present invention.

[0024] Figure 3 yes Figure 1 Schematic diagram of the second step in .

[0025] Figure 4 yes Figure 1 Schematic diagram of controlling the liquid pick-up rate of the 100% cotton spunlace nonwoven fabric in the third step.

[0026] Figure 5 yes Figure 1 Schematic diagram of ozone treatment in the third step.

[0027] Figure 6 yes Figure 1 Schematic diagram of the fourth step in .

[0028] Figure 7 yes Figure 1 Schematic diagram of controlling the liquid pick-up rate of the 100% cotton spunlace nonwoven fabric in the fifth step.

[0029] Figure 8 yes Figure 1 Schematic diagram of ozone treatment in step 5.

[0030] In the figure: impregnation liquid 1, ultrasonic assisted impregnation reaction chamber 2, cotton spunlace nonwoven fabric 3, cotton fiber 31, conveying roller 4, pressing roller 5, ozone reaction chamber 6, drafting roller 7. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] See also Figure 1 — Figure 8 , a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, the method comprising the following steps: The first step: first prepare a sodium dodecylbenzene sulfonate solution of a specified concentration, then prepare a free radical scavenging solution of a specified concentration, then evenly mix the sodium dodecylbenzene sulfonate solution and the free radical scavenging solution to obtain an impregnation solution 1, and then pass the impregnation solution 1 into an ultrasonic-assisted impregnation reaction chamber 2; Step 2: first take out the cotton spunlace nonwoven fabric 3 that has undergone the spunlace step, and then place the cotton spunlace nonwoven fabric 3 on the conveying roller 4, and then let the conveying roller 4 convey the cotton spunlace nonwoven fabric 3 to the impregnation solution 1, and then set the specified ultrasonic frequency, and then set the specified reaction temperature. At this time, the sodium dodecylbenzene sulfonate solution is used as a penetrant under the assistance of ultrasound to increase the rate at which water enters the cotton fiber 31 of the cotton spunlace nonwoven fabric 3. At the same time, the sodium dodecylbenzene sulfonate solution removes protein dirt and oily dirt on the surface of the cotton spunlace nonwoven fabric 3 under the assistance of ultrasound to achieve a degreasing effect. At this time, free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric 3, and then wait for three to five minutes; Step 3: first squeeze the cotton spunlace nonwoven fabric 3 through the pressing roller 5 to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 a specified value; then transfer the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the transfer roller 4, at this time, ozone enters the inside of the cotton spunlace nonwoven fabric 3 under the action of water, and then ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric 3 to achieve a bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form protection for the cotton fiber 31, and then wait for eight to ten minutes; Step 4: First, the cotton spunlace nonwoven fabric 3 is transferred to the impregnation liquid 1 through the transfer roller 4, and then the specified ultrasonic frequency is set, and then the specified reaction temperature is set. At this time, water enters the interior of the cotton fiber 31 of the cotton spunlace nonwoven fabric 3, and the free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric 3, and then wait for one to two minutes; Step 5: first squeeze the cotton spunlace nonwoven fabric 3 through the pressing roller 5 to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 a specified value; then convey the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4. At this time, the ozone enters the deeper part of the cotton spunlace nonwoven fabric 3 under the action of water, and then the ozone removes the pectin, wax and pigment in the cotton spunlace nonwoven fabric 3 to achieve the bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by the ozone in the aforementioned reaction to form protection for the cotton fiber 31, and then wait for three to five minutes; Step 6: First, the 100% cotton spunlace nonwoven fabric 3 is conveyed to the outside of the ozone reaction chamber 6 by the conveying roller 4, and then the 100% cotton spunlace nonwoven fabric 3 is rinsed and dried into a roll in sequence.

[0033] In the first step, the preparation of a free radical scavenging solution of a specified concentration is the preparation of an alcohol, carboxylic acid or amide free radical scavenging solution of a specified concentration.

[0034] In the first step, the step of preparing a free radical scavenging solution of a specified concentration is preparing a methanol solution of a specified concentration.

[0035] The preparation of the sodium dodecylbenzene sulfonate solution of the specified concentration is to prepare a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter, and the preparation of the methanol solution of the specified concentration is to prepare a methanol solution of 15 to 30 percent.

[0036] In the second step, the setting of the specified ultrasonic frequency is to set the ultrasonic frequency to thirty-eight to forty-three kilohertz, and the setting of the specified reaction temperature is to set the reaction temperature to fifteen to thirty-five degrees Celsius.

[0037] In the second step, setting the ultrasonic frequency of thirty-eight to forty-three kilohertz is setting the ultrasonic frequency of forty kilohertz, and setting the reaction temperature of fifteen to thirty-five degrees Celsius is setting the reaction temperature of thirty degrees Celsius.

[0038] In the third step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3 is set to a specified value, that is, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3 is 65 to 70 percent, and the conveying of the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4 is to convey the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 with an ozone concentration of 20 to 30 grams per liter through the conveying roller 4.

[0039] In the third step, the liquid carrying rate of the cotton spunlace nonwoven fabric 3 is 65-70 percent, and the ozone reaction chamber 6 with an ozone concentration of 20-30 grams per liter is 24 grams per liter.

[0040] In the fourth step, the specified ultrasonic frequency is set to an ultrasonic frequency of thirty-eight to forty-three kilohertz, and the specified reaction temperature is set to a reaction temperature of fifteen to thirty-five degrees Celsius.

[0041] In the fifth step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3 is a specified value of ninety percent of the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3, and the method of conveying the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4 is to convey the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 with an ozone concentration of twenty to thirty grams per liter through the conveying roller 4.

[0042] The supplementary description of the present invention is as follows: The de-bleaching mentioned in the present invention refers to two effects: degreasing and bleaching. Degreasing refers to removing impurities such as cotton wax and pectin, while bleaching refers to removing natural pigments contained in cotton fibers, and its components are flavonoid compounds such as quercetin and cotton linalool.

[0043] Embodiment 1: See also Figure 1 — Figure 8 , a low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric, the method comprising the following steps: The first step: first prepare a sodium dodecylbenzene sulfonate solution of a specified concentration, then prepare a free radical scavenging solution of a specified concentration, then evenly mix the sodium dodecylbenzene sulfonate solution and the free radical scavenging solution to obtain an impregnation solution 1, and then pass the impregnation solution 1 into an ultrasonic-assisted impregnation reaction chamber 2; Step 2: first take out the cotton spunlace nonwoven fabric 3 that has undergone the spunlace step, and then place the cotton spunlace nonwoven fabric 3 on the conveying roller 4, and then let the conveying roller 4 convey the cotton spunlace nonwoven fabric 3 to the impregnation solution 1, and then set the specified ultrasonic frequency, and then set the specified reaction temperature. At this time, the sodium dodecylbenzene sulfonate solution is used as a penetrant under the assistance of ultrasound to increase the rate at which water enters the cotton fiber 31 of the cotton spunlace nonwoven fabric 3. At the same time, the sodium dodecylbenzene sulfonate solution removes protein dirt and oily dirt on the surface of the cotton spunlace nonwoven fabric 3 under the assistance of ultrasound to achieve a degreasing effect. At this time, free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric 3, and then wait for three to five minutes; Step 3: first squeeze the cotton spunlace nonwoven fabric 3 through the pressing roller 5 to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 a specified value; then transfer the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the transfer roller 4, at this time, ozone enters the inside of the cotton spunlace nonwoven fabric 3 under the action of water, and then ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric 3 to achieve a bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form protection for the cotton fiber 31, and then wait for eight to ten minutes; Step 4: First, the cotton spunlace nonwoven fabric 3 is transferred to the impregnation liquid 1 through the transfer roller 4, and then the specified ultrasonic frequency is set, and then the specified reaction temperature is set. At this time, water enters the interior of the cotton fiber 31 of the cotton spunlace nonwoven fabric 3, and the free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric 3, and then wait for one to two minutes; Step 5: first squeeze the cotton spunlace nonwoven fabric 3 through the pressing roller 5 to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 a specified value; then convey the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4. At this time, the ozone enters the deeper part of the cotton spunlace nonwoven fabric 3 under the action of water, and then the ozone removes the pectin, wax and pigment in the cotton spunlace nonwoven fabric 3 to achieve the bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by the ozone in the aforementioned reaction to form protection for the cotton fiber 31, and then wait for three to five minutes; Step 6: First, the 100% cotton spunlace nonwoven fabric 3 is conveyed to the outside of the ozone reaction chamber 6 by the conveying roller 4, and then the 100% cotton spunlace nonwoven fabric 3 is rinsed and dried into a roll in sequence.

[0044] Embodiment 2: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 2 In the first step, the preparation of a free radical scavenging solution of a specified concentration is the preparation of an alcohol, carboxylic acid or amide free radical scavenging solution of a specified concentration. In the first step, the preparation of a free radical scavenging solution of a specified concentration is the preparation of a methanol solution of a specified concentration. The preparation of a sodium dodecylbenzene sulfonate solution of a specified concentration is the preparation of a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter, and the preparation of a methanol solution of a specified concentration is the preparation of a methanol solution of 15 to 30 percent.

[0045] When applied, in the first step, a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter is first prepared, preferably a sodium dodecylbenzene sulfonate solution of 0.5 grams per liter; a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter can make the treated cotton spunlace nonwoven fabric 3 have the best performance. If the sodium dodecylbenzene sulfonate solution is lower than 0.4 grams per liter, the content of sodium dodecylbenzene sulfonate is too little, and its penetration effect is not good, which affects the efficiency of ozone entering the cotton fiber 31 in the later stage. If the sodium dodecylbenzene sulfonate solution is higher than 0.6 grams per liter, the content of sodium dodecylbenzene sulfonate is too much, which will Cause waste, and cause the impregnation liquid 1 to foam too much; then prepare an alcohol, carboxylic acid or amide free radical scavenging solution, the alcohol solution is preferably a methanol solution, the concentration of the methanol solution is 15% to 30%, preferably 20%; if the concentration of the methanol solution is lower than 15%, the methanol content is too low, and the protection of the cotton fiber 31 is not sufficient; if the concentration of the methanol solution is higher than 30%, it will cause waste; the carboxylic acid solution can be acetic acid or oxalic acid solution, and the amide solution can be dimethylformamide solution; then the sodium dodecylbenzene sulfonate solution and the methanol solution are evenly mixed to obtain the impregnation liquid 1.

[0046] Embodiment 3: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 3 In the second step, the setting of the specified ultrasonic frequency is to set the ultrasonic frequency of thirty-eight to forty-three kilohertz, and the setting of the specified reaction temperature is to set the reaction temperature of fifteen to thirty-five degrees Celsius. In the second step, the setting of the ultrasonic frequency of thirty-eight to forty-three kilohertz is to set the ultrasonic frequency of forty kilohertz, and the setting of the reaction temperature of fifteen to thirty-five degrees Celsius is to set the reaction temperature of thirty degrees Celsius.

[0047] During application, when the cotton spunlace nonwoven fabric 3 is located inside the impregnation liquid 1, the ultrasonic frequency is set to 38 to 43 kilohertz, and the ultrasonic frequency is preferably 40 kilohertz. At this time, the ultrasonic wave produces a cavitation effect, causing a large number of microbubbles inside the impregnation liquid 1 to grow and burst continuously. Therefore, the impurities on the surface of the cotton spunlace nonwoven fabric 1 will be subjected to about 20,000 violent impacts per second, which can effectively remove impurities, and the cavitation effect can accelerate the movement of water, so that the water quickly reaches the inside of the cotton fiber 31, improve the subsequent ozone mass transfer efficiency, and also make the free radical scavenging molecules uniform. is located on the all-cotton spunlace nonwoven fabric 3; at the same time, a reaction temperature of fifteen to thirty-five degrees Celsius is set. In most cases, room temperature is sufficient, preferably thirty degrees Celsius. If it is lower than fifteen degrees Celsius, the molecular thermal motion is slow, resulting in a poor bleaching effect. If it is higher than thirty-five degrees Celsius, a heating device is required, which consumes a lot of energy. The second step of the immersion time is three to five minutes. When it is less than three minutes, the immersion is not sufficient, and less water enters the cotton fiber 31, which will reduce the mass transfer efficiency of ozone. When it is higher than five minutes, the overall process time becomes longer and the de-bleaching efficiency becomes lower.

[0048] Embodiment 4: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 5 In the third step, the liquid carrying rate of the cotton spunlace nonwoven fabric 3 is set to a specified value, which is to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 65% to 70%, and the conveying of the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4 is to convey the cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 with an ozone concentration of 20 to 30 grams per liter through the conveying roller 4. In the third step, the liquid carrying rate of the cotton spunlace nonwoven fabric 3 is set to a specified value, which is to make the liquid carrying rate of the cotton spunlace nonwoven fabric 3 65% to 70%, and the ozone reaction chamber 6 with an ozone concentration of 20 to 30 grams per liter is an ozone reaction chamber 6 with an ozone concentration of 24 grams per liter.

[0049] When used, in the third step, the cotton spunlace nonwoven fabric 3 is first squeezed by the pressing roller 5 so that the liquid carrying rate of the cotton spunlace nonwoven fabric 3 is 65% to 70%, preferably 70%, so that there is enough water on the cotton spunlace nonwoven fabric 3. If the liquid carrying rate is lower than 65%, the water content in the cotton spunlace nonwoven fabric 3 is less, and the content of ozone entering the cotton fiber 31 is less, which will reduce the mass transfer efficiency of ozone. If the liquid carrying rate is higher than 70%, the water content on the cotton spunlace nonwoven fabric 3 is more, and the ozone needs to pass through a thicker water film before reacting with impurities, which will reduce the efficiency of the ozone reaction. At the same time, there are also enough free radical scavenging molecules on the cotton spunlace nonwoven fabric 3. , to protect the cellulose in the cotton fiber 31; the concentration of ozone is 20 to 30 grams per liter, preferably 24 grams per liter. If it is less than 20 grams per liter, the content of ozone molecules is less, the reaction is not sufficient, and the bleaching effect does not meet the requirements. If it is higher than 30 grams per liter, the content of ozone molecules is high, which will cause the cellulose in the cotton fiber 31 to be damaged; in the third step, the ozone treatment time is eight to ten minutes. If it is less than eight minutes, the whiteness of the cotton fiber 31 will not meet the requirements. If it is higher than ten minutes, the cellulose in the cotton fiber 31 will be damaged, thereby causing the strength of the all-cotton spunlace nonwoven fabric 3 to decrease. In addition, the generation of ozone consumes electrical energy. If the reaction time is long at this time, it will also cause a waste of electrical energy.

[0050] Embodiment 5: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 6 In the fourth step, the specified ultrasonic frequency is set to an ultrasonic frequency of thirty-eight to forty-three kilohertz, and the specified reaction temperature is set to a reaction temperature of fifteen to thirty-five degrees Celsius.

[0051] During application, when the all-cotton spunlace nonwoven fabric 3 is located inside the impregnation liquid 1, the ultrasonic frequency is set to thirty-eight to forty-three kilohertz, and the ultrasonic frequency is preferably forty kilohertz. At this time, the cavitation effect of the ultrasonic wave can accelerate the movement of water, so that the water can quickly reach the inside of the cotton fiber 31, thereby improving the subsequent ozone mass transfer efficiency; at the same time, the reaction temperature is set to fifteen to thirty-five degrees Celsius, preferably thirty degrees Celsius, so that the molecules maintain rapid thermal motion and improve the bleaching effect; the immersion time of the fourth step is one to two minutes. After the ozone treatment in the third step, the hydrophobic impurities on the surface of the cotton fiber 31 are removed, the impregnation efficiency will be improved, and water will be easier to enter the interior of the cotton fiber 31. If it is less than one minute, the impregnation is not sufficient, which is not conducive to the ozone treatment in the fifth step. If it is higher than two minutes, the overall process time becomes longer and the de-bleaching efficiency is reduced.

[0052] Embodiment 6: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 8 In the fifth step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3 is a specified value, which is ninety percent of the liquid carrying rate of the 100% cotton spunlace nonwoven fabric 3. The step of conveying the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4 is to convey the 100% cotton spunlace nonwoven fabric 3 to the ozone reaction chamber 6 of the specified concentration through the conveying roller 4.

[0053] When used, in the fifth step, the cotton spunlace nonwoven fabric 3 is first squeezed by the pressing roller 5 so that the liquid carrying rate of the cotton spunlace nonwoven fabric 3 is 90%, so that there is enough moisture deep inside the cotton spunlace nonwoven fabric 3 to ensure the mass transfer efficiency of ozone; at the same time, there is also enough free radical scavenger on the cotton spunlace nonwoven fabric 3 to protect the cellulose in the cotton fiber 31; the concentration of ozone is still 20 to 30 grams per liter, preferably 24 grams per liter, while ensuring the bleaching effect, it can also avoid damage to the cellulose in the cotton fiber 31; in the fifth step, the ozone treatment time is three to five minutes. After the ozone treatment in the third step, the hydrophobic impurities on the surface of the cotton fiber 31 are removed, the impregnation efficiency will be improved, and the moisture will be easier to enter the deep inside of the cotton fiber 31, so the ozone can enter the deep inside of the cotton fiber 31, thereby reacting with the impurities inside the cotton fiber 31 to remove the impurities.

[0054] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabrics, characterized in that: The method comprises the following steps: The first step is to prepare a sodium dodecylbenzene sulfonate solution of a specified concentration, and then prepare a free radical scavenging solution of a specified concentration, and then evenly mix the sodium dodecylbenzene sulfonate solution and the free radical scavenging solution to obtain an impregnation solution (1), and then pass the impregnation solution (1) into an ultrasonic-assisted impregnation reaction chamber (2); Step 2: first take out the cotton spunlace nonwoven fabric (3) that has undergone the spunlace step, then place the cotton spunlace nonwoven fabric (3) on a conveying roller (4), and then use the conveying roller (4) to convey the cotton spunlace nonwoven fabric (3) into the impregnation solution (1), then set a specified ultrasonic frequency, and then set a specified reaction temperature. At this time, the sodium dodecylbenzene sulfonate solution acts as a penetrant under the assistance of ultrasound to increase the rate at which water enters the cotton fibers (31) of the cotton spunlace nonwoven fabric (3). At the same time, the sodium dodecylbenzene sulfonate solution removes protein dirt and oily dirt on the surface of the cotton spunlace nonwoven fabric (3) under the assistance of ultrasound to achieve a degreasing effect. At this time, free radical scavenging molecules are attached to the cotton spunlace nonwoven fabric (3), and then wait for three to five minutes; Step 3: first, the cotton spunlace nonwoven fabric (3) is squeezed by a pressing roller (5) to make the liquid carrying rate of the cotton spunlace nonwoven fabric (3) a specified value; then, the cotton spunlace nonwoven fabric (3) is conveyed to an ozone reaction chamber (6) of a specified concentration by a conveying roller (4); at this time, ozone enters the interior of the cotton spunlace nonwoven fabric (3) under the action of water, and then the ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric (3) to achieve a bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form a protection for the cotton fiber (31), and then wait for eight to ten minutes; Step 4: First, the 100% cotton spunlace nonwoven fabric (3) is transferred to the impregnation liquid (1) via a transfer roller (4), and then a specified ultrasonic frequency is set, and then a specified reaction temperature is set. At this time, water enters the interior of the cotton fibers (31) of the 100% cotton spunlace nonwoven fabric (3), and free radical scavenging molecules are attached to the 100% cotton spunlace nonwoven fabric (3), and then wait for one to two minutes; Step 5: first, the cotton spunlace nonwoven fabric (3) is squeezed by a pressing roller (5) to make the liquid carrying rate of the cotton spunlace nonwoven fabric (3) a specified value; then, the cotton spunlace nonwoven fabric (3) is conveyed to an ozone reaction chamber (6) of a specified concentration by a conveying roller (4); at this time, the ozone enters deeper into the cotton spunlace nonwoven fabric (3) under the action of water, and then the ozone removes pectin, wax, and pigment in the cotton spunlace nonwoven fabric (3) to achieve a bleaching effect, and the free radical scavenging molecules reduce the hydroxyl radicals generated by ozone in the aforementioned reaction to form a protection for the cotton fiber (31), and then wait for three to five minutes; Step 6: First, the 100% cotton spunlace nonwoven fabric (3) is conveyed to the outside of the ozone reaction chamber (6) by means of a conveying roller (4), and then the 100% cotton spunlace nonwoven fabric (3) is subjected to the steps of rinsing and drying to form a roll.

2. The low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 1, characterized in that: In the first step, the preparation of a free radical scavenging solution of a specified concentration is the preparation of an alcohol, carboxylic acid or amide free radical scavenging solution of a specified concentration.

3. A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 2, characterized in that: In the first step, the step of preparing a free radical scavenging solution of a specified concentration is preparing a methanol solution of a specified concentration.

4. A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 3, characterized in that: The preparation of the sodium dodecylbenzene sulfonate solution of the specified concentration is to prepare a sodium dodecylbenzene sulfonate solution of 0.4 to 0.6 grams per liter, and the preparation of the methanol solution of the specified concentration is to prepare a methanol solution of 15 to 30 percent.

5. The low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 1, characterized in that: In the second step, the setting of the specified ultrasonic frequency is to set the ultrasonic frequency to thirty-eight to forty-three kilohertz, and the setting of the specified reaction temperature is to set the reaction temperature to fifteen to thirty-five degrees Celsius.

6. A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 5, characterized in that: In the second step, setting the ultrasonic frequency of thirty-eight to forty-three kilohertz is setting the ultrasonic frequency of forty kilohertz, and setting the reaction temperature of fifteen to thirty-five degrees Celsius is setting the reaction temperature of thirty degrees Celsius.

7. The low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 1, characterized in that: In the third step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric (3) is set to a specified value, that is, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric (3) is 65 to 70 percent, and the conveying of the 100% cotton spunlace nonwoven fabric (3) to an ozone reaction chamber (6) having a specified concentration by means of a conveying roller (4) is to convey the 100% cotton spunlace nonwoven fabric (3) to an ozone reaction chamber (6) having an ozone concentration of 20 to 30 grams per liter by means of a conveying roller (4).

8. A low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 7, characterized in that: In the third step, the liquid carrying rate of the all-cotton spunlace nonwoven fabric (3) is 65 to 70 percent, and the ozone reaction chamber (6) with an ozone concentration of 20 to 30 grams per liter is an ozone reaction chamber (6) with an ozone concentration of 24 grams per liter.

9. The low-energy-consumption and high-efficiency debleaching method for all-cotton spunlace nonwoven fabric according to claim 1, characterized in that: In the fourth step, the specified ultrasonic frequency is set to an ultrasonic frequency of thirty-eight to forty-three kilohertz, and the specified reaction temperature is set to a reaction temperature of fifteen to thirty-five degrees Celsius.

10. The low-energy-consumption and high-efficiency debleaching method for pure cotton spunlace nonwoven fabric according to claim 1, characterized in that: In the fifth step, the liquid carrying rate of the 100% cotton spunlace nonwoven fabric (3) is a specified value, which is the liquid carrying rate of the 100% cotton spunlace nonwoven fabric (3) is ninety percent, and the step of conveying the 100% cotton spunlace nonwoven fabric (3) to an ozone reaction chamber (6) of a specified concentration by means of a conveying roller (4) is the step of conveying the 100% cotton spunlace nonwoven fabric (3) to an ozone reaction chamber (6) of an ozone concentration of twenty to thirty grams per liter by means of a conveying roller (4).

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