Quantitative detection method for components of lyocell fiber and plant source fiber multi-component fiber product

Abstract

The invention relates to the technical field of fiber product detection, in particular to a component quantitative detection method for a lyocell fiber and plant source fiber multi-component fiber product. The detection method comprises the following steps: taking a sample block from a to-be-detected sample, soaking, cutting into pieces, scattering and collecting; measuring the widths w < standard > and w < sample > of the lyocell fibers by using a fiber analyzer; sampling, dyeing and flaking the scattered and collected fibers, and respectively measuring the total lengths of the lyocell fibers and other plant source fibers by using a fiber analyzer; and according to the calculated quality factor of the lyocell fiber and the quality factor of the known plant source fiber, calculating to obtain the mass ratio of each fiber. The invention provides a quantitative detection method for fiber components of a lyocell fiber and plant source fiber multi-component fiber product, and the detection method pays attention to the stability of a detection result while ensuring the accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber product detection, and in particular to a method for quantitatively detecting the components of a multi-component fiber product of lyocell fiber and plant-derived fiber. Background Art

[0002] Plant-derived fibers include virgin plant fibers and regenerated cellulose fibers. Virgin plant fibers include, but are not limited to, wood pulp fibers, cotton fibers, bamboo pulp fibers, and hemp pulp fibers, while regenerated cellulose fibers primarily include viscose fibers, lyocell fibers, and modal fibers. Lyocell fibers, due to their high strength, biodegradability, and smooth feel, have gradually become a primary raw material for products such as soft wipes, wet wipes, wet toilet paper, and non-woven fabrics. Currently, multi-component fiber products containing lyocell fibers suffer from issues such as false product labeling and inconsistent functional claims, causing a degree of confusion and misleading for consumers when purchasing these products. Because lyocell fibers and other plant-derived fibers share the same chemical composition (both are composed of cellulose molecules), existing methods cannot quantitatively distinguish lyocell fibers from other plant-derived fibers. The lack of quantitative detection methods has hindered the quality control of related products. Therefore, a method that can accurately and quantitatively determine the ratio of lyocell fibers to plant-derived fibers is urgently needed to regulate the market and protect consumer rights. Summary of the Invention

[0003] In order to solve or partially solve the problems existing in the related art, the present invention provides a method for quantitatively detecting the composition of a multi-component fiber product of lyocell fiber and plant-derived fiber. The method specifically comprises: Step a), taking a sample block from the sample to be tested, soaking, cutting, breaking up and collecting; Step b), measure the width of lyocell fiber using a fiber analyzer w 标 and w 样 ; Step c), calculate the lyocell fiber quality factor according to formula I and formula II: Formula I In Formula I: S 标 ——Lyocell standard fiber linear density, mg / 100m; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; W 标 ——Lyocell standard fiber width, μm; W 样 ——width of the sample lyocell fiber, μm; Formula II In Formula II: f ——Quality factor of the sample lyocell fiber; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; 18——standard cotton fiber coarseness, mg / 100m; Step d), sampling, dyeing, and preparing slices from the fibers collected after being broken up, and measuring the total lengths of the lyocell fibers and other plant-derived fibers respectively using a fiber analyzer; Step e), calculate the composition of the multi-component fiber product according to Formula III: (i=1,2,····,n) Formula III In formula III: P i ——Content of type i fiber, %; l i ——Total length of fiber type i, mm; f i ——Quality factor of the i-th fiber; The multi-component fiber product of lyocell fiber and plant-derived fiber consists of one lyocell fiber and at least one plant-derived fiber.

[0004] Furthermore, in step a), the sample block immersion time is set to 4 to 48 hours.

[0005] Furthermore, the dye used in step b) is a Herzberg dye, and the magnification of the fiber analyzer objective lens should be no less than 40 times.

[0006] Furthermore, the step b) is specifically as follows: Step b1), sampling, dyeing, and preparing slices from the standard lyocell fibers and the fibers collected after being broken apart, respectively, and measuring the widths of the lyocell fibers in the standard lyocell fibers and the fibers collected after being broken apart using a fiber analyzer; Furthermore, in the step b1), three different positions of each lyocell fiber are randomly measured once each, and the total number of measurements is not less than 100 times; the average value is used to represent the width of the lyocell fiber.

[0007] Furthermore, the stain used in step d) is one of Herzberg stain or Graff C stain.

[0008] Furthermore, the multi-component fiber product is one or more of wet wipes, soft wipes, wet toilet paper, and non-woven fabrics.

[0009] Furthermore, it is characterized in that the plant-derived fiber is one or more of wood pulp fiber, cotton fiber, bamboo fiber, hemp fiber, mulberry fiber, and viscose fiber.

[0010] The method for detecting the composition of a multi-component fiber product provided by the present invention may have the following beneficial effects: This method provides a method for testing the composition of multi-component fiber products composed of lyocell and plant-derived fibers. Currently, there is a lack of technical means for testing the composition of such multi-component fiber products. This invention successfully fills this gap and provides a reliable composition testing method for such products. This method can provide relevant companies and market regulators with an effective testing method to ensure the authenticity and transparency of the ingredients of such products. This will not only help promote the establishment of industry standards and improve product quality, but also further enhance consumer trust in products, thereby playing a positive role in promoting the healthy development of the entire industry.

[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention. Figure 1 This is a micrograph of the fiber analysis of sample 1 in Example 1 of the present invention, and the magnification of the photo is 100 times. Figure 2 This is a micrograph of the fiber analysis of sample 2 in Example 1 of the present invention, and the magnification of the photo is 100 times. DETAILED DESCRIPTION

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0014] In the description of the present invention, “plurality” means two or more, unless otherwise clearly defined.

[0015] After research, the inventors of this application found that the main reason for the above-mentioned problems is the lack of a quantitative detection method for the composition of the fiber products, which has led to labeling errors of related fiber products on the market and product promotions that are inconsistent with actual conditions. Whether it is manufacturers, consumers or regulators, they all need an accurate measurement method to quantitatively determine the proportion of fibers to ensure that their respective interests are protected and their respective responsibilities are implemented.

[0016] The inventors of this application searched for existing relevant testing methods and found no method for analyzing multi-component composite materials of lyocell and plant-derived fibers in the GB / T 2910 series of standards for quantitative chemical analysis of textiles. While GB / T 4688-2020, Analysis of Fiber Composition of Paper, Paperboard, and Pulp, can better characterize the fiber types of these products, the linear density of lyocell fibers varies from product to product, making it impossible to provide an accurate quality factor and, therefore, determine an accurate ratio. In response to the aforementioned market demands and current technological status, there is an urgent need for a quantitative testing method for the composition of multi-component fiber products of lyocell and plant-derived fibers.

[0017] In response to the above market demands and current technological status, the inventors of the present application have considered providing a method for quantitatively determining the fiber components of lyocell fibers and plant-derived fiber composite materials for multi-component fiber products with good result stability.

[0018] The present invention provides a method for quantitatively detecting the components of a multi-component fiber product of lyocell fiber and plant-derived fiber, which is characterized by comprising: Step a), taking a sample block from the sample to be tested, soaking, cutting, breaking up and collecting; Step b), measure the width of lyocell fiber using a fiber analyzer w 标 and w 样 ; Step c), calculate the lyocell fiber quality factor according to formula I and formula II: Formula I In Formula I: S 标 ——Lyocell standard fiber linear density, mg / 100m; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; W 标 ——Lyocell standard fiber width, μm; W 样 ——width of the sample lyocell fiber, μm; Formula II In Formula II: f ——Quality factor of the sample lyocell fiber; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; 18——standard cotton fiber coarseness, mg / 100m; Step d), sampling, dyeing, and preparing slices from the fibers collected after being broken up, and measuring the total lengths of the lyocell fibers and other plant-derived fibers respectively using a fiber analyzer; Step e), calculate the composition of the multi-component fiber product according to Formula III: (i=1,2,····,n) Formula III In formula III: P i ——Content of type i fiber, %; l i ——Total length of fiber type i, mm; f i ——Quality factor of the i-th fiber; The multi-component fiber product of lyocell fiber and plant-derived fiber consists of one lyocell fiber and at least one plant-derived fiber.

[0019] In the above-mentioned testing method, step a) requires soaking the sample to be tested, then chopping it into pieces and breaking it up to provide a suitable sample for subsequent testing. Chopping helps to better break up the sample, while soaking ensures that the lyocell fiber fully swells and reaches a stable width. Furthermore, the soaking time is 4 to 48 hours.

[0020] Step b) measures the width of the Lyocell fiber. This step provides a benchmark for the subsequent calculation of the Lyocell fiber quality factor in the sample. The dye used in this step is either Herzberg dye or Graff C dye. Research has shown that Herzberg and Graff C dyes are more stable than other dyes, ensuring consistent Lyocell fiber width during measurement. The fiber analyzer objective lens magnification should be no less than 40x to minimize width measurement errors. A higher magnification minimizes the impact of fiber boundary errors on the measurement results.

[0021] In order to improve the accuracy of the lyocell fiber width measurement results and take into account the convenience of the experiment, the above step b) is preferably: Step b1), sampling, dyeing, and preparing slices from the standard lyocell fibers and the fibers collected after being broken apart, respectively, and measuring the widths of the lyocell fibers in the standard lyocell fibers and the fibers collected after being broken apart using a fiber analyzer; Furthermore, in the step b1), three different positions of each lyocell fiber are randomly measured once each, and the total number of measurements is not less than 100 times; the average value is used to represent the width of the lyocell fiber.

[0022] Lyocell fibers are cylindrical in shape and uniform in thickness. However, in actual samples, the width of Lyocell fibers can vary locally due to factors such as sample type, spinning method, and liquid content. Therefore, within the fiber analyzer's width measurement field, three measurements were taken at three random locations on each Lyocell fiber. Research has shown that after a total of 100 measurements, the results of Lyocell fiber width measurements become generally stable.

[0023] Step c) calculates the quality factor of the lyocell fiber. This step is characterized by the fact that lyocell fiber is the only plant-derived fiber with a circular or nearly circular cross-section. Lyocell fiber generally has a cylindrical structure with uniform thickness. Therefore, its linear density (coarseness) is linearly correlated with fiber width. Therefore, by measuring the width of the lyocell fiber in the sample, its linear density can be calculated. By comparing it with a standard cotton fiber, the quality factor of the lyocell fiber can be further calculated. Furthermore, by measuring the width of the lyocell fiber in the sample and comparing it with a lyocell fiber of known linear density, the linear density of the lyocell fiber in the sample can be calculated. Furthermore, linear density is a term used in the textile field, while coarseness is a term used in the papermaking field. Their technical essence is the same, both describing the mass of the fiber per unit length. The units used are also the same, both expressed in mg / 100m.

[0024] Step d) is to sample, dye, and prepare slices from the fibers after being scattered and collected, and measure the total length of each fiber in the field of view using a fiber analyzer. Furthermore, the dye used is one of Herzberg dye and Graff C dye.

[0025] Step e) is to calculate the mass proportion of each fiber component based on the measured and calculated lyocell fiber quality factor and the length of other plant-derived fibers.

[0026] The above-mentioned detection method provided in the embodiments of the present invention is applicable to testing one or more multi-component fiber products such as wet wipes, soft towels, wet toilet paper, and non-woven fabrics. The plant-derived fibers in the multi-component fiber products can be one or more of wood pulp fibers, cotton fibers, bamboo fibers, hemp fibers, mulberry fibers, and viscose fibers. For the specific type of plant-derived fiber, qualitative identification can be performed according to the FZ / T 01057 Textile Fiber Identification Test Method Series Standard and GB / T 4688-2020 Analysis of Paper, Paperboard, and Pulp Fiber Composition.

[0027] As can be seen from the above, the method for detecting the ingredients of a multi-component fiber product provided by an embodiment of the present invention has the following advantages: the method provides a method for detecting the ingredients of a multi-component fiber product composed of lyocell fiber and plant-derived fiber. Currently, there is a lack of technical means for detecting the ingredients of such multi-component fiber products, and the present invention successfully fills this gap and provides a reliable ingredient detection method for such products. This method can provide relevant companies and market regulators with an effective detection method, through which the authenticity and transparency of the ingredients of such products can be ensured. This will not only help promote the construction of industry standards and improve product quality, but also further enhance consumers' trust in the product, thereby playing a positive role in promoting the healthy development of the entire industry.

[0028] The technical solution of the present invention will be further described below in conjunction with specific embodiments:

[0029] Randomly draw one sample from each package, then take a small piece, approximately 5 cm x 5 cm, from any location on the sample. After soaking thoroughly, cut it into small pieces with scissors. Use a hand-held blender to thoroughly break up the small pieces, then filter and collect the broken fibers using a filter cloth. Take about 5 g of lyocell standard fiber with known linear density and soak it in deionized water. After soaking for 4 hours, filter the lyocell standard fiber with filter cloth and collect it. Take the dispersed sample and the soaked lyocell standard fiber respectively, dye and prepare slices, and then observe them with a fiber analyzer. Adjust the objective lens to 40 times and measure the width of the lyocell fiber in the two samples with a fiber analyzer. Randomly measure once at three different parts of each lyocell fiber, and the number of measurements shall not be less than 100 times. The average value of the 100 measurement results is used to represent the width of the lyocell fiber in the two samples. Calculate the linear density s of the sample lyocell fiber based on the ratio of the cross-sectional area of ​​the sample lyocell fiber to the cross-sectional area of ​​the lyocell standard fiber. Finally, calculate the quality factor of the lyocell fiber in the sample based on the ratio of the linear density of the lyocell fiber to the linear density of the standard cotton fiber (18 mg / 100 m). Samples are taken from the dispersed samples for dyeing and preparation, and then the total lengths of the lyocell fibers and plant-derived fibers are measured respectively using a fiber analyzer. Based on the calculated lyocell fiber quality factor and the quality factor of the known plant-derived fibers, the mass proportion of each fiber is calculated.

[0030] Table 1 shows the composition test results of wet wipes, soft wipes, wet toilet paper, non-woven Blacelle fiber and plant-based fiber multi-component fiber products from different batches of multiple brands.

[0031] Table 1 Experimental results As can be seen from Table 1, the present invention can effectively measure the fiber composition of multi-component samples of lyocell and plant-derived fibers, and the results are relatively stable. The present invention can effectively fill the gap in quantitative fiber composition detection methods for such products and can also facilitate product quality monitoring and analysis of such products.

[0032] While various embodiments of the present invention have been described above, the above descriptions are intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for detecting the composition of a multi-component fiber product, characterized in that The following steps are included in sequence: Step a), taking a sample block from the sample to be tested, soaking, cutting, breaking up and collecting; Step b), measure the width of lyocell fiber using a fiber analyzer w 标 and w 样 ; Step c), calculate the lyocell fiber quality factor according to formula I and formula II: Formula I In Formula I: S 标 ——Lyocell standard fiber linear density, mg / 100m; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; w 标 ——Lyocell standard fiber width, μm; w 样 ——width of the sample lyocell fiber, μm; Formula II In Formula II: f ——Quality factor of the sample lyocell fiber; S 样 ——Linear density of the lyocell fiber sample, mg / 100m; 18——standard cotton fiber coarseness, mg / 100m; Step d), sampling, dyeing, and preparing slices from the fibers collected after being broken up, and measuring the total lengths of the lyocell fibers and other plant-derived fibers respectively using a fiber analyzer; Step e), calculate the composition of the multi-component fiber product according to Formula III: (i=1,2,...,n) Equation III In formula III: P i ——Content of type i fiber, %; l i ——Total length of fiber type i, mm; f i ——Quality factor of the i-th fiber; The multi-component fiber product of lyocell fiber and plant-derived fiber consists of one lyocell fiber and at least one plant-derived fiber.

2. The detection method according to claim 1, wherein In the step a), the sample block soaking time is set to 4 to 48 hours.

3. The detection method according to claim 1, wherein The dye used in step b) is Herzberg dye, and the magnification of the fiber analyzer objective lens should be no less than 40 times.

4. The detection method according to claim 1, wherein The step b) is specifically as follows: Step b1) sampling, dyeing and preparing slices from the standard lyocell fibers and the fibers collected after being scattered, respectively; and measuring the widths of the lyocell fibers in the standard lyocell fibers and the fibers collected after being scattered using a fiber analyzer.

5. The detection method according to claim 4, characterized in that The step b1) specifically comprises: randomly measuring three different positions of each lyocell fiber once each, with the total number of measurements being no less than 100 times; and using the average value to represent the width of the lyocell fiber.

6. The detection method according to claim 1, characterized in that The stain used in step d) is one of Herzberg stain or Graff C stain.

7. The detection method according to claim 1, characterized in that The multi-component fiber product is one or more of wet wipes, soft wipes, wet toilet paper, and non-woven fabrics.

8. The detection method according to claim 1, wherein The plant-derived fiber is one or more of wood pulp fiber, cotton fiber, bamboo fiber, hemp fiber, mulberry fiber, and viscose fiber.

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