Low odor all-viscose fiber soft tissue and preparation method thereof

Abstract

The present application relates to the technical field of daily sanitary products, and discloses a low-odor all-viscose fiber soft towel and a preparation method. The method aims to solve the problem of odor caused by sulfide residues in the production process of viscose fiber. The core of the method is that after the water jet process, an ester odor-removing agent solution containing α, β-unsaturated double bonds is applied to the un-dried viscose fiber soft towel substrate by high-pressure atomization spraying, and then drying is performed at 100-150 DEG C. In this process, the moisture of the un-dried substrate promotes the penetration of the odor-removing agent into the fiber, and the specific drying temperature activates and accelerates the Michael addition reaction between the unsaturated double bonds and the residual sulfide, and the three work together to efficiently and completely eliminate the sulfide odor from the root, without damaging the soft and skin-friendly nature of the fiber. The method has strong process adaptability and is suitable for continuous industrial production.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, specifically to a low-odor, all-viscose fiber soft towel and its preparation method. Background Technology

[0002] Viscose fiber, with its excellent absorbency, biocompatibility, biodegradability, and cost advantages, has become a core raw material for disposable soft towels (such as face towels). As the global nonwoven fabric market continues to expand, the market demand for viscose fiber soft towels is growing rapidly. However, in the inherent "viscose method" production process of all-viscose fiber soft towels, a key step involves the use of carbon disulfide (CS2) for xanthation, and the subsequent acid bath coagulation and regeneration stage also produces byproducts such as hydrogen sulfide and thiols. If subsequent desulfurization and washing processes are not thorough, sulfides can easily remain in the pores, surface, and inter-fiber gaps of the fibers, some adsorbed onto the fiber substrate in a free or bound state. Although the content of these residual sulfides is extremely low (usually at the ppm level), their sensory threshold is low, making them easily perceptible to the human body, thus giving the finished soft towels an irritating "sulfur smell."

[0003] The odor is particularly noticeable after the towels are opened, and it is amplified further when wet (cold or warm water). This not only seriously affects the user experience but also causes discomfort to sensitive individuals and raises concerns about product safety, becoming a common technical pain point in the towel industry. More importantly, these residual sulfides (mainly hydrogen sulfide and thiols) can pose potential health hazards. Since soft towels are primarily used for direct skin contact with the face and hands, residual sulfides can enter the body through two routes: skin contact and inhalation. Skin contact can easily cause irritation symptoms such as redness and itching, which are more pronounced in people with sensitive skin and may induce skin inflammation. Inhalation can irritate the respiratory mucosa, causing discomfort such as burning throat and cough. Long-term or repeated contact may also affect the central nervous system, causing symptoms such as headache, dizziness, and fatigue. High concentrations can even lead to serious consequences such as respiratory paralysis. These sulfides pose a potential threat to the human respiratory system, nervous system, and skin mucosa, further highlighting the urgency and necessity of removing the odor from soft towels.

[0004] In addition, there are many ways to reduce the odor of viscose fiber towels, such as increasing the amount of scouring and washing (reducing the spinning speed) and optimizing the desulfurization process (increasing the amount of alkali and bleach). However, these methods will increase the fiber production cost accordingly. Moreover, due to process fluctuations, the effectiveness of the above methods in controlling odor is not stable.

[0005] To address the above issues, the existing methods for reducing odor in tissue paper mainly include the following two:

[0006] Sensory masking method: This method uses the aroma of fragrances / fragrances to mask the odor of the towel itself. This method can only achieve temporary sensory masking through the superposition of odors. It does not chemically decompose or physically remove the substances that produce odors (such as sulfides), and cannot eliminate odor molecules at the source. Moreover, the odor is easy to reappear after the fragrance evaporates, making it difficult to achieve a long-term odor reduction effect.

[0007] Physical cleaning method: The soft towel containing the "sulfur smell" is rolled up, rinsed and washed, and dried to remove some of the odor. This method has obvious limitations, is energy-intensive and costly, and is very difficult to operate because the non-woven fabric has low strength.

[0008] In summary, existing methods for reducing sulfide odors in towels have significant shortcomings, including temporary masking, poor applicability, poor operability, and safety hazards. These methods fail to meet the core requirements of towel products for odor removal that are thorough, long-lasting, safe, and adaptable. There is an urgent need for a targeted and stable chemical modification method to address these industry pain points. Summary of the Invention

[0009] The purpose of this invention is to provide a low-odor all-viscose fiber soft towel and its preparation method. It uses an ester compound containing α,β-unsaturated double bonds, which has high efficiency and specific chemical reactivity with residual sulfur compounds in viscose fiber soft towels, and is based on the catalytic chemical deodorization technology of the Michael reaction. The deodorizer is loaded onto the soft towel substrate to achieve molecular-level sulfur odor removal, thereby eliminating sulfur odor from the source.

[0010] The technical solution of the present invention is as follows:

[0011] A method for preparing a low-odor, all-viscose fiber soft towel includes the following steps:

[0012] (1) After the hydroentangling process, an undried viscose fiber soft towel substrate is obtained;

[0013] (2) The solution is applied online to the undried substrate by high-pressure atomization spraying;

[0014] (3) An aqueous solution containing a deodorizing agent is applied to the substrate by atomization spraying, wherein the deodorizing agent...

[0015] These are ester compounds containing α,β-unsaturated double bonds that can undergo Michael addition reactions with sulfides;

[0016] (4) The substrate treated in step (3) is dried by hot air penetration at a temperature of 100-150°C.

[0017] The equipment is used for drying, which allows the deodorizing agent to react with the sulfide odor molecules in the substrate to generate stable sulfur-containing ester compounds.

[0018] Further optimization involves using a wet viscose fiber nonwoven fabric that has undergone a hydroentangling process.

[0019] Further optimization is made by specifying that the ester compound containing α,β-unsaturated double bonds is at least one of fumarate compounds, acrylate compounds, and maleate compounds.

[0020] Further optimization is made by specifying that the acrylate compound is one of methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, and ethylene glycol diacrylate, the maleate compound is one of dimethyl maleate, diethyl maleate, and dimethyl fumarate, and the fumarate compound is one of dimethyl fumarate and diethyl fumarate.

[0021] Further optimization involves setting the mass concentration of the deodorizing agent aqueous solution to 0.5-5%.

[0022] Further optimization involves applying the deodorizing agent at an amount of 0.01-2% of the dry weight of the viscose fiber nonwoven fabric substrate.

[0023] Further optimization is achieved by setting the drying temperature to 100-150℃.

[0024] Further optimization involves using a hot air penetration dryer.

[0025] Further optimization is made so that the total weight of the solution applied by the atomized spray does not exceed 15% of the dry weight of the substrate.

[0026] A low-odor, all-viscose fiber soft towel.

[0027] The beneficial effects of this application are:

[0028] By adding ester compounds containing α,β-unsaturated double bonds during the production of viscose fiber soft towels through chemical modification, the unsaturated double bonds are used as reaction sites. Through the activation of a catalyst, odor molecules undergo an addition reaction with the compounds, binding sulfur-containing odor groups into the molecules to form stable odorless compounds. This eliminates odors at the source, rather than through physical adsorption or odor masking. This ensures that the soft towels meet the low-odor or odor-free standards in both dry and wet (cool / warm water) states, avoiding temporary odor masking or later recurrence.

[0029] The moisture in the undried substrate acts as a carrier, promoting the deodorizing agent to penetrate deep into the fiber pores and precisely contact the residual sulfides inside. The specific temperature range plays a crucial dual role: firstly, it efficiently activates and drives the unsaturated double bonds to undergo a Michael addition reaction with the sulfides, achieving chemical bonding; secondly, it precisely controls the reaction rate and process, avoiding decomposition of the deodorizing agent or excessive release of sulfides due to excessively high temperatures, or incomplete reaction on the fiber surface due to excessively low temperatures, which would cause the sulfides to be released again. The three factors work together to eliminate odors at the molecular level in a root-cause and long-lasting manner, while fully preserving the softness and skin-friendly properties of the towel.

[0030] 3. Optimize the dosage of the deodorizing agent, precisely controlling it to 0.01-2% of the dry weight of the viscose fiber nonwoven fabric substrate: Too low a dosage will result in incomplete odor removal, while too high a dosage can lead to deodorizing agent residue, ester-like odors, increased costs, and potential impact on skin affinity. A reasonable dosage balances deodorizing effect, product performance, and cost. High-pressure atomization spraying technology allows for precise spraying of the water-containing deodorizing agent into the grooves and pores of the fiber surface, achieving uniform penetration and ensuring full contact between the deodorizing agent and the fiber, avoiding the drawbacks of traditional application methods. The unsaturated double-bond ester deodorizing agent used is biodegradable, highly safe, low in toxicity and skin irritation, has simple metabolism, and its residue level is far below the safety threshold. It does not decompose at a face-washing temperature of 0-45℃, and can remain on the fiber surface to form a protective barrier, locking in residual sulfides. The drying process uses a hot air penetration dryer, which allows hot air to penetrate the fiber layer and quickly and evenly remove moisture. It is adapted to parameters of 100-150℃, taking into account both the reaction rate and the performance of the soft towel, avoiding problems such as decomposition of deodorizing agents, excessive release of sulfides, and incomplete reaction. The unsaturated ester deodorizing agent solution is evenly loaded onto the soft towel substrate, ensuring that the deodorizing agent and the soft towel fibers are in full contact. The chemical modification method makes the entire process safe and controllable, meeting the market demand for high-quality, low-odor / odorless soft towel products, while controlling processing costs and avoiding significant additional increases in production energy consumption and raw material costs. Attached Figure Description

[0031] Figure 1 The above are the single-factor ANOVA analysis spectra of the odor scores of four groups of samples in warm water for comparative examples, Example 2, Example 3 and Example 4 of this invention.

[0032] Figure 2 This is a single-factor ANOVA analysis spectrum of odor scores under warm water conditions for the comparative example and Example 2 of this invention;

[0033] Figure 3 This is a Tukey multiple comparison chart of the odor scores of four groups of samples in warm water for comparative examples, Example 2, Example 3 and Example 4 of this invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0038] Example 1

[0039] This embodiment provides a low-odor, all-viscose fiber soft towel and its preparation method. The deodorizing agent used is Eliminaze, a commercially available product from Givaudan, Switzerland, whose main component is dialkyl fumarate. The method includes the following steps:

[0040] 1) Prepare a 1% Eliminaze deodorizing agent stock solution: Weigh 2g of Eliminaze deodorizing agent, add deionized water to make up to a total volume of 200g, stir well, and let stand for later use;

[0041] 2) Cut a soft towel base material with a specification of 10cm×20cm and weigh it to be 1.56g;

[0042] 3) Spray 0.78g of deionized water (0.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0043] 4) Take 0.156g of 1% deodorizing agent stock solution, mix it evenly with 1.56g of deionized water, and spray it onto the soft towel substrate to obtain a soft towel with a deodorizing agent loading of 0.1% (relative to the substrate mass).

[0044] 5) Place the sprayed sample in a 105℃ hot air penetration dryer and dry for 2 minutes.

[0045] Example 2

[0046] This embodiment provides a low-odor, all-viscose fiber soft towel and its preparation method. The deodorizing agent used is Eliminaze, a commercially available product from Givaudan, Switzerland, whose main component is dialkyl fumarate. The method includes the following steps:

[0047] 1) Prepare a 1% Eliminaze deodorizing agent stock solution: Weigh 2g of Eliminaze deodorizing agent, add deionized water to make up to a total volume of 200g, stir well, and let stand for later use;

[0048] 2) Cut a soft towel base material with a specification of 10 cm × 20 cm and weigh it to be 1.56 g;

[0049] 3) Spray 0.78g of deionized water (0.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0050] 4) Take 0.078g of 1% deodorizing agent stock solution, mix it evenly with 1.56g of deionized water, and spray it onto the soft towel substrate to obtain a soft towel with a deodorizing agent loading of 0.05% (relative to the substrate mass).

[0051] 5) Place the sprayed sample in a 105℃ hot air penetration dryer and dry for 2 minutes.

[0052] Example 3

[0053] This embodiment provides a low-odor, all-viscose fiber soft towel and its preparation method. The deodorizing agent used is Eliminaze, a commercially available product from Givaudan, Switzerland, whose main component is dialkyl fumarate. The method includes the following steps:

[0054] 1) Prepare a 1% Eliminaze deodorizing agent stock solution: Weigh 2g of Eliminaze deodorizing agent, add deionized water to make up to a total volume of 200g, stir well, and let stand for later use;

[0055] 2) Cut a soft towel base material with a specification of 10cm×20cm and weigh it to be 1.56g;

[0056] 3) Spray 0.78g of deionized water (0.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0057] 4) Take 0.039g of 1% deodorizing agent stock solution, mix it evenly with 1.56g of deionized water, and spray it onto the soft towel substrate to obtain a soft towel with a deodorizing agent loading of 0.025% (relative to the substrate mass).

[0058] 5) Place the sprayed sample in a 105℃ hot air penetration dryer and dry for 2 minutes.

[0059] Example 4

[0060] This embodiment provides a low-odor, all-viscose fiber soft towel and its preparation method. The deodorizing agent used is Eliminaze, a commercially available product from Givaudan, Switzerland, whose main component is dialkyl fumarate. The method includes the following steps:

[0061] 1) Prepare a 1% Eliminaze deodorizing agent stock solution: Weigh 2g of Eliminaze deodorizing agent, add deionized water to make up to a total volume of 200g, stir well, and let stand for later use;

[0062] 2) Cut a soft towel base material with a specification of 10cm×20cm and weigh it to be 1.56g;

[0063] 3) Spray 0.78g of deionized water (0.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0064] 4) Take 0.0156g of 1% deodorizing agent stock solution, mix it evenly with 1.56g of deionized water, and spray it onto the soft towel substrate to obtain a soft towel with a deodorizing agent loading of 0.01% (relative to the substrate mass).

[0065] 5) Place the sprayed sample in a 105℃ hot air penetration dryer and dry for 2 minutes.

[0066] Example 5

[0067] This embodiment provides a low-odor, all-viscose fiber soft towel and its preparation method. The deodorizing agent used is Eliminaze, a commercially available product from Givaudan, Switzerland, whose main component is dialkyl fumarate. The method includes the following steps:

[0068] 1) Prepare a 1% Eliminaze deodorizing agent stock solution: Weigh 2g of Eliminaze deodorizing agent, add deionized water to make up to a total volume of 200g, stir well, and let stand for later use;

[0069] 2) Cut a soft towel base material with a specification of 10cm×20cm and weigh it to be 1.56 g;

[0070] 3) Spray 0.78g of deionized water (0.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0071] 4) Take 0.078g of 1% deodorizing agent stock solution, mix it evenly with 1.56g of deionized water, and spray it onto the soft towel substrate to obtain a soft towel with a deodorizing agent loading of 0.05% (relative to the substrate mass).

[0072] 5) Place the sprayed sample in a 150℃ hot air penetration dryer and dry for 2 minutes.

[0073] Comparative Example

[0074] 1) Cut a soft towel base material with a specification of 10cm×20cm and weigh it to be 1.56g;

[0075] 2) Spray 2.34g of deionized water (1.5 times the mass of the base fabric) onto the base fabric to simulate the state of the spunlace fabric before it is dried;

[0076] 3) Place the sprayed sample in a 105℃ hot air penetration dryer and dry for 2 minutes to obtain a blank control soft towel.

[0077] Experimental Example

[0078] For the deodorizing soft towel samples prepared in Examples 1-5 and the comparative example, and blank soft towel samples, the odor of the finished products in dry, cool water-soaked, and warm water-soaked states was tested using a blind testing rating method. The specific steps are as follows:

[0079] Dry air temperature detection

[0080] (1) Select a deodorizing agent sample of 10cm×20cm to treat the soft towel or blank soft towel, and ensure that the sample is undamaged, free of impurities, and kept dry.

[0081] (2) The tester immediately places the sample 3-5 cm away from the nose and gently fans the air around the sample with his hand to spread the odor evenly and avoid direct contact between the sample and the nasal cavity.

[0082] (3) The testing personnel shall conduct blind testing and rating of the odor of the sample according to the preset odor evaluation standard and record the test results.

[0083] Odor detection in cold water immersion state

[0084] (1) Select a deodorizing agent sample of 10cm×20cm to treat the soft towel or blank soft towel, and ensure that the sample is undamaged, free of impurities, and kept dry.

[0085] (2) Immerse the sample completely in cool water, and after it is evenly moistened, take it out and gently press the surface of the sample with sterile filter paper to remove excess water (avoid squeezing too hard to avoid damaging the sample or losing the effective ingredients).

[0086] (3) The tester immediately places the sample 3-5 cm away from the nose and gently fans the air around the sample with his hand to spread the odor evenly and avoid direct contact between the sample and the nasal cavity.

[0087] (4) The testing personnel shall conduct blind testing and rating of the odor of the sample according to the preset odor evaluation standard and record the evaluation results.

[0088] Odor detection in warm water immersion state

[0089] (1) Select a deodorizing agent sample of 10cm×20cm to treat the soft towel or blank soft towel, and ensure that the sample is undamaged, free of impurities, and kept dry.

[0090] (2) Heat the deionized water to 60°C in advance and keep it at a constant temperature. Immerse the sample completely in the 60°C warm water and remove it after it is evenly soaked. Use sterile filter paper to gently press the surface of the sample to remove excess water (avoid squeezing too hard to prevent the sample from breaking or the loss of effective ingredients).

[0091] (3) Immediately place the treated sample 3-5 cm away from your nose, gently fan the air around the sample with your hand, and smell the odor emitted by the sample. Avoid direct contact of the sample with the nasal cavity (be careful to avoid burns from the high temperature of the sample).

[0092] (4) The testing personnel shall conduct blind testing and rating of the odor of the sample according to the preset odor evaluation standard and record the evaluation results.

[0093] The odor evaluation criteria are shown in Table 1. If the odor is perceived to be between two levels, 0.5 can be used to represent half a level.

[0094] Table 1

[0095]

[0096] The odor test results of the finished products in dry, cool water-soaked, and warm water-soaked states are shown in Tables 2, 3, and 4, respectively:

[0097] Table 2

[0098]

[0099] Table 3

[0100]

[0101] Table 4

[0102]

[0103] The comparison samples and Examples 1-4 will be tested and compared:

[0104] In the dry state, the odor scores of the comparative examples (blank soft towels), Example 1 (+0.1% Eliminaze), Example 2 (+0.05% Eliminaze), Example 3 (+0.025% Eliminaze), and Example 4 (+0.01% Eliminaze) were not significantly different, and there was no obvious difference in odor.

[0105] As shown in Table 3, under cold water conditions, the odor score of the Example 2 (+0.05% Eliminaze) group was the lowest (2.450), and its odor performance was relatively the best; the score of the blank soft towel group in the comparative example was the highest (2.975), and its odor performance was relatively poor.

[0106] As shown in Table 4, under warm water conditions, the odor score of the Example 4 (+0.05% Eliminaze) group was the lowest (2.350), and its odor performance was relatively the best; the blank soft towel group of the comparative example had the highest score (3.075), and its odor performance was relatively poor.

[0107] Example 2 (+0.05% Eliminaze) had the best odor score, while the comparative example (blank soft towel) had a poorer odor score.

[0108] The comparison samples and Examples 2 and 5 will be tested and compared:

[0109] Under dry conditions, the odor score of Example 2 (+0.05% Eliminaze) was the lowest (1.725), and its odor performance was relatively the best; while the odor performance of Example 5 (+0.05% Eliminaze (150℃)) was the worst (2.05).

[0110] In the cool water condition, the odor score of Example 2 (+0.05% Eliminaze) was the lowest (2.450), and its odor performance was relatively the best; while the odor performance of Example 5 (+0.05% Eliminaze (150℃)) (3.275) was relatively the worst.

[0111] Under warm water conditions, the odor score of Example 2 (+0.05% Eliminaze) was the lowest (2.350), and its odor performance was relatively the best; while the odor performance of Example 5 (+0.05% Eliminaze (150℃)) (3.725) was relatively the worst.

[0112] Example 2 (+0.05% Eliminaze) had the best odor score. When the drying temperature was increased to 150°C, Example 5 (+0.05% Eliminaze (150°C)) had the worst odor score. The reason may be that the high temperature caused the Eliminaze deodorizer to decompose thermally and lose some of its activity, or the high temperature caused more sulfides to be released from the soft towel fibers, which aggravated the odor.

[0113] To further verify the significant difference in odor between Example 2 (+0.05% Eliminaze) and the comparative example (blank tissue), the odor assessment data of the comparative example, Example 2, Example 3, and Example 4 were processed and analyzed using Minitab statistical software. The results are as follows:

[0114] 1. Descriptive statistical analysis

[0115] Descriptive statistics were performed on the odor assessment data of the four groups of samples from Comparative Example, Example 2, Example 3, and Example 4 under dry, cool water immersion, and hot water immersion conditions. The mean, standard deviation, minimum, median, maximum, and range of each group were calculated. The specific data are shown in Tables 5-8.

[0116] Table 5

[0117]

[0118] Table 6

[0119]

[0120] Table 7

[0121]

[0122] Table 8

[0123]

[0124] Based on the above averages, in the dry state, the comparative blank soft towel group scored 1.650, the odor score of Example 4 (+0.01% Eliminaze) group was 1.700, the odor score of Example 3 (+0.025% Eliminaze) group was 1.650, and the odor score of Example 2 (+0.05% Eliminaze) group was 1.725, with no significant difference in odor.

[0125] In the cool water condition, the odor score of the Example 2 (+0.05% Eliminaze) group was the lowest (2.450), and its odor performance was relatively the best; the score of the blank soft towel group in the comparative example was the highest (2.975), and its odor performance was relatively poor.

[0126] Under warm water conditions, the odor score of the Example 2 (+0.05% Eliminaze) group was the lowest (2.350), and its odor performance was relatively the best; the score of the comparative blank soft towel group was the highest (3.075), and its odor performance was relatively poor.

[0127] 2. One-way ANOVA

[0128] To verify whether the differences in odor scores among the four groups of samples and the comparative example compared to Example 2 were statistically significant, odor assessment data under warm water conditions were used as the research object. A one-way ANOVA was conducted, with a significance level of α=0.05. A p-value ≤ 0.05 was considered statistically significant. The correlation analysis results are as follows: Figure 1 and Figure 2 .

[0129] (1) Analysis of variance of the four groups of samples

[0130] Assumptions: The null hypothesis (H0) is that all sample means are equal; the alternative hypothesis (H1) is that not all sample means are equal; the significance level α = 0.05, and it is assumed that the variances of each group are equal.

[0131] Factor information: The factor is the product category, with a total of 4 levels: +0.01% Eliminaze, +0.025% Eliminaze, +0.05% Eliminaze, and blank soft towel.

[0132] Analysis of variance results: Degrees of freedom from source (product type 3, error 76, total 79), adjusted sum of squares (product type 5.359, error 43.063, total 48.422), adjusted mean square (product type 1.7865, error 0.5666), F-value = 3.15, P-value = 0.030.

[0133] Conclusion: P=0.030<0.05, rejecting the null hypothesis, indicating that there is a statistically significant difference in the odor scores of the four groups of samples under warm water conditions.

[0134] (2) Analysis of variance of the comparative example and Example 2

[0135] Factor information: The factor is the product type, with two levels: +0.05% Eliminaze (Example 2) and blank soft towel (comparative example).

[0136] Analysis of variance results: Degrees of freedom from source (product type 1, error 38, total 39), adjusted sum of squares (product type 5.256, error 23.688, total 28.944), adjusted mean square (product type 5.2563, error 0.6234), F-value = 8.43, P-value = 0.006.

[0137] Conclusion: P=0.006<0.05, rejecting the null hypothesis, indicating that there is a statistically significant difference in the odor scores of the comparative example and Example 2 under warm water conditions.

[0138] 3. Tukey Multiple Comparisons

[0139] To further clarify the specific differences among the four groups of samples, Tukey multiple comparisons were performed on the air temperature measurement data of the four groups of samples, the comparative example, and Example 2 under warm water conditions. The same group letter indicates significant differences between the groups, and different letters indicate significant differences between the groups, as shown in Tables 9 and 10.

[0140] (1) Multiple comparisons of 4 groups of samples

[0141] Table 9

[0142]

[0143] Conclusion: Figure 3 As shown, the comparative example is grouped as A, and Example 2 is grouped as B. The two groups have different grouping letters, which further verifies that there is a significant difference between them. Example 3 and Example 4 are both grouped as A and B, and there is no significant difference between them and the comparative example and Example 2.

[0144] (2) Multiple comparisons of the comparative example and Example 2 individually

[0145] Table 10

[0146]

[0147] Conclusion: The comparative example was grouped A, and Example 2 was grouped B. The two groups have different group letters, which once again verifies that there is a significant difference in the odor scores of the two under warm water conditions, which is consistent with the results of one-way ANOVA.

[0148] 4. Summary of Statistical Analysis

[0149] In the dry state, there was no significant difference in odor among the four groups of samples; in the cool water and warm water states, Example 2 showed the best odor performance, while the comparative example showed the worst odor performance.

[0150] One-way ANOVA and Tukey multiple comparisons both confirmed that there was a statistically significant difference in odor scores between the comparative example and Example 2 under warm water conditions, indicating that 0.05% Eliminaze deodorizer can effectively improve the odor of the soft towel, and the effect is statistically significant.

[0151] There was no significant difference between Example 3 (+0.025% Eliminaze), Example 4 (+0.01% Eliminaze) and the comparative example and Example 2, indicating that Eliminaze deodorizer at concentrations below 0.05% has no significant effect on improving the odor of soft towels.

[0152] This experiment tested the odor of all-viscose fiber towels treated with different amounts of Eliminaze deodorizing agent and dried at different temperatures in three states: dry, cool water, and warm water. The results were then combined with the single-factor ANOVA (analysis and analysis) method described earlier. Figure 1 , Figure 2 ) and Tukey's multiple comparisons ( Figure 3 Statistical analysis yielded the following conclusions:

[0153] (1) Under dry conditions, there was no significant difference in odor scores between blank soft towels and soft towels treated with different amounts (0.01%~0.1%) of Eliminaze. This may be because the release of sulfide odors is low under dry conditions, and the effect of the deodorizing agent does not show a significant difference.

[0154] (2) Under water conditions (cold water, warm water), Eliminaze deodorizer significantly removed the sulfide odor from the all-viscose fiber soft towel. The 0.05% dosage group (Example 2) had the lowest odor score (2.450 for cold water, 2.350 for warm water), which was the best odor performance compared to the blank soft towel group (2.975 for cold water, 3.075 for warm water). The single-factor ANOVA under warm water conditions (P=0.030<0.05) and the comparison between the blank group and the 0.05% dosage group (P=0.006<0.05) showed that there was a significant difference in the odor evaluation between the 0.05% Eliminaze dosage and the blank soft towel group. That is, the 0.05% Eliminaze dosage has a significant effect on the improvement of the soft towel odor, which verifies that this dosage is the optimal dosage.

[0155] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A method for preparing a low-odor, all-viscose fiber soft towel, characterized in that, Includes the following steps: (1) After the hydroentangling process, an undried viscose fiber soft towel substrate is obtained; (2) The solution is applied online to the undried substrate by high-pressure atomization spraying; (3) An aqueous solution containing a deodorizing agent is applied to a substrate by atomization spraying. The deodorizing agent is an ester compound containing α,β-unsaturated double bonds that can undergo a Michael addition reaction with sulfides. (4) The substrate treated in step (3) is dried in a hot air penetration drying device at a temperature of 100-150°C, so that the deodorizing agent reacts with the sulfide odor molecules in the substrate to generate stable sulfur-containing ester compounds.

2. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The substrate is a wet viscose fiber nonwoven fabric that has undergone a hydroentangling process.

3. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The ester compound containing α,β-unsaturated double bonds is at least one of fumarate compounds, acrylate compounds, and maleate compounds.

4. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The acrylate compound is one of methyl acrylate, ethyl acrylate, hydroxyethyl acrylate, and ethylene glycol diacrylate; the maleate compound is one of dimethyl maleate and diethyl maleate; and the fumarate compound is one of dimethyl fumarate and diethyl fumarate.

5. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The deodorizing agent aqueous solution has a mass concentration of 0.5-5%.

6. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The amount of the deodorizing agent applied is 0.01-2% of the dry weight of the viscose fiber nonwoven fabric substrate.

7. The method for producing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The drying temperature is 100-150℃.

8. The method for producing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The drying equipment is a hot air penetration dryer.

9. The method for preparing a low-odor, all-viscose fiber soft towel according to claim 1, characterized in that, The total weight of the solution applied by atomized spraying shall not exceed 15% of the dry weight of the substrate.

10. A low-odor, all-viscose fiber soft towel prepared by any one of the preparation methods of claims 1-7.

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