Method for detecting paper fibers

Abstract

This application relates to a method for detecting paper fibers, comprising the following steps: mixing the paper sample to be tested with a solvent, and dissolving it at a rotation speed of 8000 r / min to 25000 r / min for 1 min to 11 min to obtain a dissolved sample; adding a dye to the dissolved sample to dye the wood and hemp fibers in the dissolved sample to obtain a dyed sample; and performing microscopic detection on the dyed sample to analyze the detection results. Through controllable mechanical shear force, the wood and hemp fibers in the paper sample to be tested can be efficiently and fully dispersed, while minimizing the damage to fiber morphology caused by traditional chemical or high-temperature dissociation methods, laying a physical foundation for subsequent accurate identification. Therefore, this application can rapidly and accurately identify and detect fiber type and proportion through dyeing reaction and microscopic morphology, resulting in more scientific and practical analytical results.

Description

Technical Field

[0001] This application relates to the field of detection and analysis technology, and in particular to a method for detecting paper fibers. Background Technology

[0002] Cigarette paper is a key material affecting the combustion performance, sensory quality, and safety of cigarettes. Plant fibers, as the main component of cigarette paper, directly influence the paper's physical structure, air permeability, burning rate, and ash behavior through their type (e.g., softwood pulp, hardwood pulp, hemp pulp) and proportion. Therefore, analyzing the fiber composition of cigarette paper is of crucial scientific value and practical significance for product development, quality control, process optimization, and the identification of differentiated products.

[0003] Currently, fiber analysis of pulp raw materials mainly relies on the national standard GB / T 4688-2002, "Analysis of Fiber Composition in Paper, Paperboard and Pulp." However, this method is primarily suited for unfinished pulp or loosely structured paper samples. For finished paper that has undergone high-intensity beating, fine papermaking, high-temperature drying, and calendering, the fibers are tightly interwoven and highly bonded, forming a dense and robust sheet-like structure. Directly employing traditional methods presents several significant drawbacks: Firstly, the finished paper's compact structure makes it difficult to completely disperse it into individual fibers suitable for microscopic observation without damaging the fiber morphology. Secondly, the drastic pretreatment process can lead to fiber curling, breakage, and fibrillation, blurring or eliminating characteristic morphological features (such as pitting, cavity diameter ratio, and fiber length distribution), greatly complicating subsequent microscopic morphological identification and resulting in highly subjective and poorly repeatable results.

[0004] Therefore, traditional technologies still need improvement. Summary of the Invention

[0005] Based on this, this application provides an efficient method for detecting paper fibers.

[0006] The specific technical solution is as follows:

[0007] This application provides a method for detecting paper fibers, comprising the following steps:

[0008] The paper sample to be tested is mixed with solvent and decomposed at a speed of 8000 r / min to 25000 r / min for 1 min to 11 min to prepare the decomposed sample;

[0009] The loosened sample and dye are mixed, and the wood and hemp fibers in the loosened sample are dyed to prepare a dyed sample; and,

[0010] The stained samples were subjected to microscopic examination, and the results were analyzed.

[0011] In some embodiments, the rotation speed of the scavenging is 12000 r / min to 21000 r / min, and the scavenging time is 5 min to 8 min.

[0012] In some embodiments, the detection method is a quantitative detection method for paper fibers, and further includes the following steps:

[0013] The dyed sample was observed under a microscope, and the mass ratio of wood fiber and hemp fiber in the dyed sample was calculated based on the observation results.

[0014] In some embodiments, the observed fibers with a reddish hue are hemp fibers, and / or the fibers with a blue hue are wood fibers.

[0015] In some embodiments, the wood fiber has a length of 2mm to 4mm and a width of 40μm to 55μm, in which case the wood fiber is coniferous wood fiber; or

[0016] If the wood fiber has a length of 0.8mm to 1.2mm and a width of 17μm to 25μm, then the wood fiber is a broadleaf wood fiber.

[0017] In some embodiments, the step of adding a dyeing agent to the defragmented sample to dye the wood and hemp fibers in the defragmented sample includes the following steps:

[0018] The loosened sample is dropped onto a glass slide, dried, and then stained with a dye to stain the wood and hemp fibers in the loosened sample, thus preparing the stained sample.

[0019] In some embodiments, the staining agent includes AlCl3, CaCl2, ZnCl2, potassium iodide, and iodine.

[0020] In some embodiments, the concentration of AlCl3 in the staining agent is 0.14 g / mL to 0.16 g / mL, the concentration of CaCl2 is 0.12 g / mL to 0.13 g / mL, the concentration of ZnCl2 is 0.36 g / mL to 0.40 g / mL, the concentration of potassium iodide is 4.07 mg / mL to 4.50 mg / mL, and the concentration of iodine is 2.94 mg / mL to 3.25 mg / mL.

[0021] In some embodiments, the paper sample to be tested is selected from one or more of cigarette paper, shaped paper, and printing paper;

[0022] And / or, the solvent includes water.

[0023] In some of these embodiments, the staining time is 10s to 30s;

[0024] And / or, the drying temperature is 115℃~125℃.

[0025] The paper fiber detection method described in this application involves mixing the paper sample with a solvent and then subjecting it to a specific disintegration treatment to obtain a disintegrated sample. Controllable mechanical shearing force efficiently disperses the wood and hemp fibers in the paper sample, while minimizing the damage to fiber morphology caused by traditional chemical or high-temperature dissociation methods, thus laying a physical foundation for accurate identification. A dye is then added to the disintegrated sample to stain the wood and hemp fibers, resulting in a dyed sample. The dyed sample is then subjected to microscopic examination to analyze the results. Therefore, this application enables rapid and accurate identification and detection of fiber type and proportion through dyeing reaction and microscopic morphology, providing more scientific and practical analytical results. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a microscopic observation of the staining effect of different dyes on cigarette paper samples in Example 1. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be more thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The word "optionally" herein indicates an example.

[0030] Unless otherwise stated or in case of contradiction, the terms or phrases used herein shall have the following meanings:

[0031] In this application, the terms "multiple" or "various" are used unless otherwise specified, referring to a quantity greater than or equal to 2. For example, "one or more" means one or more types.

[0032] In this application, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0033] In this application, terms such as "further" and "especially" are used to describe purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0034] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0035] In this application, when numerical intervals (i.e., numerical ranges) are mentioned, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, including the two endpoint integers of the numerical range, as well as every integer between the two endpoints, is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include numerical interval types such as percentage intervals, ratio intervals, and proportion intervals.

[0036] In this application, the term "room temperature" generally refers to 4℃~35℃, and preferably 20℃±5℃. In some embodiments of this application, room temperature refers to 20℃~30℃.

[0037] In this application, unless otherwise specified, the temperature parameters are permitted to be either constant temperature treatment or variations within a certain temperature range. It should be understood that the constant temperature treatment allows temperature fluctuations within the precision range controlled by the instrument. Fluctuations are permitted within ranges such as ±5℃, ±4℃, ±3℃, ±2℃, and ±1℃.

[0038] In this application, if the unit of a data range is only followed by the right endpoint, it indicates that the units of the left and right endpoints are the same. For example, 2~5h means that the units of the left endpoint "2" and the right endpoint "5" are both h (hours).

[0039] One embodiment of this application provides a method for detecting paper fibers, including steps S100 to S300.

[0040] Step S100: Mix the paper sample to be tested with the solvent and decompose it at a speed of 8000r / min~25000r / min for 1min~11min to prepare the decomposed sample.

[0041] Step S200: Mix the above-mentioned loosened sample with the dyeing agent, and dye the wood fiber and hemp fiber in the loosened sample to prepare the dyed sample.

[0042] Step S300: Perform microscopic examination on the stained sample and analyze the results.

[0043] The paper fiber detection method described in this application involves mixing the paper sample with a solvent and then subjecting it to a specific disintegration treatment to obtain a disintegrated sample. Controllable mechanical shearing force efficiently disperses the wood and hemp fibers in the paper sample, while minimizing the damage to fiber morphology caused by traditional chemical or high-temperature dissociation methods, thus laying a physical foundation for accurate identification. A dye is then added to the disintegrated sample to stain the wood and hemp fibers, resulting in a dyed sample. The dyed sample is then subjected to microscopic examination to analyze the results. Therefore, this application enables rapid and accurate identification and detection of fiber type and proportion through dyeing reaction and microscopic morphology, providing more scientific and practical analytical results.

[0044] The rotational speed for the aforementioned dewatering process ranges from 8000 r / min to 25000 r / min. This includes the minimum and maximum values ​​within this range, as well as every value between these two values. Specific examples include, but are not limited to, the point values ​​in the embodiments and the following point values: 8000 r / min, 8500 r / min, 9000 r / min, 9500 r / min, 10000 r / min, 10500 r / min, 11000 r / min, 11500 r / min, 12000 r / min, 12500 r / min, 13000 r / min, 13500 r / min, 14000 r / min, 14500 r / min, 15000 r / min, 15500 r / min, 16000 r / min, 16500 r / min, 17000 r / min, 17500 r / min, 18000 r / min. r / min, 18500 r / min, 19000 r / min, 19500 r / min, 20000 r / min, 20500 r / min, 21000 r / min, 21500 r / min, 22000 r / min, 22500 r / min, 23000 r / min, 23500 r / min, 24000 r / min, 24500 r / min, 25000 r / min, or any range of any two of these values, for example, including 10000 r / min to 21000 r / min.

[0045] In some embodiments, the rotation speed of the scavenging is 12000 r / min to 21000 r / min, and the scavenging time is 5 min to 8 min.

[0046] Understandably, by controlling the disintegration conditions within the above range, the interwoven wood and hemp fibers in the paper fiber sample can be further efficiently dispersed and formed into independent fiber states, resulting in a better disintegration effect.

[0047] In some embodiments, the above detection method is a quantitative detection method for paper fibers, and the detection method further includes the following steps:

[0048] The dyed samples were subjected to microscopic observation, and the mass ratio of wood fiber and hemp fiber in the dyed samples was calculated based on the observation results.

[0049] In some of these embodiments, the fibers with a reddish hue are hemp fibers, and / or the fibers with a blue hue are wood fibers.

[0050] In some embodiments, the wood fibers have a length of 2 mm to 4 mm and a width of 40 μm to 55 μm, in which case the wood fibers are coniferous wood fibers; or

[0051] If the wood fiber has a length of 0.8mm to 1.2mm and a width of 17μm to 25μm, then the wood fiber is a broadleaf wood fiber.

[0052] Understandably, paper fiber samples after delamination can retain the original shape and structural integrity of the fibers to the greatest extent. After dyeing with dyeing agents, hemp fibers and wood fibers can show clear and distinguishable dyeing differences. Furthermore, through morphological characteristics (length, width, aspect ratio), the fiber type can be accurately identified and the proportion can be quantitatively analyzed.

[0053] In some embodiments, the step of adding a dye to the above-mentioned defatted sample and dyeing the wood fibers and hemp fibers in the above-mentioned defatted sample includes the following steps:

[0054] The sparsed sample was dropped onto a glass slide, dried, and then stained with a dye to stain the wood fibers and hemp fibers in the sparsed sample, thus preparing the stained sample.

[0055] In some embodiments, the staining agents include AlCl3, CaCl2, ZnCl2, potassium iodide, and iodine.

[0056] In some embodiments, the concentration of AlCl3 in the staining agent is 0.14 g / mL to 0.16 g / mL, the concentration of CaCl2 is 0.12 g / mL to 0.13 g / mL, the concentration of ZnCl2 is 0.36 g / mL to 0.40 g / mL, the concentration of potassium iodide is 4.07 mg / mL to 4.50 mg / mL, and the concentration of iodine is 2.94 mg / mL to 3.25 mg / mL. For example, the concentration of AlCl3 can be 0.14 g / mL, 0.15 g / mL, or 0.16 g / mL, and the concentration of CaCl2 can be 0.120 g / mL, 0.121 g / mL, 0.122 g / mL, 0.123 g / mL, 0.124 g / mL, or 0.125 g / mL. The concentrations of ZnCl2 can be 0.36 g / mL, 0.37 g / mL, 0.38 g / mL, 0.39 g / mL, or 0.40 g / mL, and the concentrations of potassium iodide can be 4.07 mg / mL, 4.17 mg / mL, 4.27 mg / mL, 4.37 mg / mL, 4.47 mg / mL, or 4.50 mg / mL. The concentrations of iodine can be 2.94 mg / mL, 3 mg / mL, 3.1 mg / mL, 3.2 mg / mL, or 3.25 mg / mL. In some examples, the values ​​can be any two of these point values ​​within a range defined by the endpoints.

[0057] In some of these embodiments, the staining agent described above includes Graff "C" stain.

[0058] In some embodiments, the paper sample to be tested is selected from one or more of cigarette paper, forming paper, and printing paper.

[0059] In some of these embodiments, the solvent includes water.

[0060] In some embodiments, the staining time is 10s to 30s. For example, the staining time can be 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, or 30s. In some examples, it can be any two of these point values ​​as end values ​​within a range.

[0061] In some embodiments, the drying temperature is 115°C to 125°C. For example, the drying temperature can be 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C, or 125°C. In some examples, it can be any two of these point values ​​as end values ​​within a range.

[0062] Another embodiment of this application provides an application of the paper fiber detection method described above in the analysis of cigarette paper composition.

[0063] The technical solution of this application is simple to operate, has good repeatability, and is highly applicable. It does not require complex and expensive special equipment, making it easy to promote and apply in scenarios such as cigarette paper production testing, quality supervision, and scientific research analysis. It effectively reduces the technical threshold and testing cost of cigarette paper fiber analysis.

[0064] The following detailed description is provided with reference to specific embodiments. Unless otherwise specified, the embodiments do not include components other than unavoidable impurities. Unless otherwise specified, the reagents and instruments used in the embodiments are conventionally selected in the art. Experimental methods not specifying specific conditions in the embodiments are implemented according to conventional conditions, such as those described in literature, books, or methods recommended by the manufacturer.

[0065] Example 1

[0066] 1. Instruments and reagents:

[0067] TALBOYS magnetic stirrer; Kunshan Ultrasonic Instrument Co., Ltd., KQ-800DE CNC ultrasonic cleaner; Joyoung silent blender L18-P393, stirring power 1000w; OLYMPUS CX33 microscope, 4x objective lens.

[0068] Zinc chloride (Aladdin, 99.95%), aluminum chloride hexahydrate (Aladdin, 99.99%), potassium iodide (Aladdin, ≥99.99%), iodine (Aladdin, 99.99%), anhydrous calcium chloride (Tianjin Ruijinte, analytical grade); Herzberg staining agent: 10g zinc chloride added to 5mL warm water (zinc chloride solution); 0.21g potassium iodide and 0.01g iodine dissolved in 0.5mL water (iodine solution); 1.5mL of zinc chloride solution was mixed with the prepared iodine solution to obtain Herzberg staining agent. Erzberg staining agent; Graff "C" staining agent: 10g zinc chloride added to 5mL warm water (zinc chloride solution); 4g aluminum chloride dissolved in 10mL water (aluminum chloride solution); 10g calcium chloride dissolved in 15mL water (calcium chloride solution); 0.09g potassium iodide and 0.065g iodine dissolved in 5mL water (iodine solution); mix 1mL zinc chloride solution, 2mL aluminum chloride solution, 1mL calcium chloride solution and 1.25mL iodine solution to obtain Graff "C" staining agent.

[0069] 2. Investigation and optimization of sample disintegration conditions

[0070] 2.1 The dispersing effect of the magnetic stirrer was investigated: Under the condition of room temperature and the mass ratio of the cigarette paper sample to water being 1:1000, the sample was not evenly dispersed after stirring at the highest speed (1600 rpm) for 40 min, and there were still lumps of paper.

[0071] Further extending the stirring time, after 80 minutes, the sample became a uniform fiber suspension, but a small amount of undispersed sample remained.

[0072] 2.2 The dispersing effect of the ultrasonic disperser was investigated: Under the condition of room temperature and the mass ratio of the cigarette paper sample to water was 1:1000, after 1 h of ultrasonication, a small part of the fibers around the block sample were dispersed into the aqueous solution, but large pieces of sample still existed.

[0073] 2.3 To further improve the fiber separation effect, equipment suitable for fiber separation was selected from commercially available juicers, blenders, and other products. The requirements were: 1) The rotor should be as blunt as possible, avoiding sharp rotors to prevent the sample fibers from being cut by the rotor during separation; 2) The speed should be adjustable, and a low speed should be selected without affecting work efficiency. After comparing more than ten machines on the market, the Joyoung blender with a blunt rotor was selected.

[0074] Cigarette paper samples were selected for testing. A fiber debonding test was conducted at room temperature with a mass ratio of cigarette paper sample to water of 1:1000. The fiber debonding effect under different rotation speeds and different debonding times was investigated. The details are shown in Table 1.

[0075] Table 1

[0076] Dissipation conditions (rotation speed) 1 minute of dredging 2 minutes of dredging 3 minutes of dredging 4min 5 minutes of dredging 6 minutes of dredging 7 minutes of dredging 8 minutes of dredging 9min 10 minutes of dredging 11 minutes of dredging 8000r / min There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are many large samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples 12000r / min There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples There are blocky samples Evenly dispersed Evenly dispersed 15000r / min There are blocky samples There are blocky samples There are blocky samples There are blocky samples Evenly dispersed Evenly dispersed Evenly dispersed Evenly dispersed The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. 18000r / min There are blocky samples There are blocky samples There are blocky samples There are blocky samples Evenly dispersed Evenly dispersed Evenly dispersed Evenly dispersed The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. 21000r / min There are blocky samples There are blocky samples There are blocky samples There are blocky samples Evenly dispersed Evenly dispersed Evenly dispersed The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope. The fibers are evenly dispersed, but appear damaged under a microscope.

[0077] Investigations revealed that treatment at speeds of 15000 r / min, 18000 r / min, and 21000 r / min for 5 minutes resulted in uniform dispersion of cigarette paper samples, with no obvious lumps observed. However, with prolonged dispersal, the cigarette paper samples observed under a microscope showed damage due to over-dispersal; therefore, the dispersal time should not be too long. Further verification was conducted on 21 other samples using a 15000 r / min treatment for 5 minutes. The results showed that for some difficult-to-disperse samples, a longer dispersal time or a higher speed was necessary to ensure complete fiber dispersal and obtain a uniform fiber suspension. Most cigarette paper samples achieved ideal uniform dispersion under the 15000 r / min treatment for 5 minutes condition. The dispersal effects of different samples are shown in Table 2. Therefore, a 15000 r / min treatment for 5 minutes was ultimately selected as the dispersal condition for cigarette paper.

[0078] Table 2

[0079] sample De-icing effect 1# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 2# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 3# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 4# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 5# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 6# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 7# Complete dissolution can be achieved by treating at 15000 r / min for 10 minutes or at 18000 r / min or 21000 r / min for 5 minutes. 8# Complete dissolution was achieved by treating at 15000 r / min for 10 minutes or at 18000 r / min or 21000 r / min for 5 minutes. 9# Complete dissolution was achieved by processing at 15000 r / min for 15 minutes or at 21000 r / min for 5 minutes (complete dissolution was not achieved by processing at 18000 r / min for 5 minutes or at 18000 r / min for 10 minutes). 10# Complete dissolution was achieved by processing at 15000 r / min for 15 minutes or at 21000 r / min for 5 minutes (complete dissolution was not achieved by processing at 18000 r / min for 5 minutes or at 18000 r / min for 10 minutes). 11# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 12# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 13# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 14# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 15# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 16# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 17# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 18# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 19# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 20# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 21# Processing at 15000 r / min for 5 minutes resulted in complete dissolution. 22# Processing at 15000 r / min for 5 minutes resulted in complete dissolution.

[0080] Therefore, this application specifically establishes a fiber dispersing technology solution adapted to cigarette paper samples. By comparing the dispersing effects of magnetic stirrers, ultrasonic dispersers, and commercially available blenders, the optimal dispersing method was selected to efficiently disperse the interwoven wood and hemp fibers in cigarette paper into independent fiber states. This effectively solves the technical problem that existing dispersing methods easily lead to fiber breakage and incomplete dispersion, thus affecting the accuracy of subsequent fiber identification and the reliability of quantitative analysis. This dispersing method can preserve the original morphology and structural integrity of the fibers to the greatest extent, laying a solid foundation for accurate identification of fiber types and quantitative analysis of proportions, and significantly improving the pretreatment effect and stability of cigarette paper fiber analysis.

[0081] 3. Evaluation of the effects of different staining agents

[0082] The staining effects of Herzberg and Graff "C" staining agents on cigarette paper samples were investigated.

[0083] Sample preparation: Use a dropper to draw up the above-dissolved suspension sample and drop it onto a glass slide. Evaporate the water on a 120°C heating plate, add a drop of staining agent, cover the glass slide, and use filter paper to absorb the excess staining agent from the edge. Then, it can be observed under a microscope.

[0084] Taking cigarette paper samples with comparable wood fiber and hemp fiber content as an example for analysis, from... Figure 1As can be seen, Herzberg's reagent staining effect is generally heavy, making it difficult to distinguish between purple, dark red, and blue. Graff's "C" reagent staining effect is slightly lighter, and the light blue and dark blue corresponding to wood fibers and the burgundy corresponding to hemp fibers are clearly distinguishable. Furthermore, coniferous and broadleaf fibers can also be clearly distinguished based on their respective morphological characteristics. Figure 1 (marked at points A and B), therefore Graff "C" was chosen as the dye for cigarette paper.

[0085] The fiber raw materials used in cigarette paper are generally bleached chemical pulp. Mechanical pulp or unbleached chemical pulp is almost never used in cigarette paper production. Therefore, the color development effect in Table 4 can be used for differentiation. Hemp fiber and wood fiber can be distinguished by the significant difference in their red and blue hues. Softwood and hardwood fibers have weaker color differentiation and require more attention to their respective fiber morphology. Softwood fibers are longer, ranging from 2 to 4 millimeters in length and 40 to 55 micrometers in width; hardwood fibers are shorter, about 1 millimeter in length, with a length-to-width ratio mostly below 60 (width between 17 and 25 micrometers).

[0086] Table 4

[0087] category color sesame paste Wine red, brownish red Coniferous and broadleaf pulp Light blue-gray, gray, light brown Broadleaf chemical pulp Bright blue, light blue, blue-gray

[0088] Therefore, this application, by examining the dyeing effects of Herzberg and Graff "C" fiber dyes, determined a more suitable dye for distinguishing between hemp and wood fibers in cigarette paper. This solves the technical pain point of existing dyes, which exhibit low contrast and blurred boundaries between the two types of fibers, making it difficult to quickly and accurately distinguish fiber types. The selected dye can make hemp and wood fibers exhibit clear and distinguishable dyeing differences, facilitating rapid identification of fiber types through subsequent microscopic observation and other methods. This significantly improves the efficiency and accuracy of fiber type identification and reduces the risk of misjudgment due to poor dyeing effects.

[0089] 4. Fiber Quantity

[0090] Cigarette paper made from different pulps has significant differences in fiber morphology. By combining an integrated microscope and a digital imaging system to acquire images, fiber types can be identified, fiber counts can be recorded, and lengths can be measured.

[0091] Specifically as follows:

[0092] 1) Establish category management: According to the fiber type that needs to be measured, a label color can be defined for each category and a name can be assigned.

[0093] 2) Fiber length measurement: According to the preset category, starting from one end of the fiber, click to track along the fiber skeleton trajectory until the other end of the fiber. Right-click to end the labeling of the current fiber. The labeled polyline and length are displayed on the image in real time.

[0094] 3) Data statistics: Accumulate and statistically analyze the information on the length and number of each type of fiber.

[0095] 4) Data Export: Export the statistical results and the categorized images to Excel for further analysis and organization.

[0096] The system can collect and analyze data online, or import images offline for analysis, meeting the needs of applications such as cigarette paper product development, quality control, and authenticity verification.

[0097] 5. Cigarette paper sample testing

[0098] Using the method established above, the laboratory performed fiber decomposition on 22 cigarette paper samples, stained them with Graff "C" reagent, and photographed about four areas under a microscope. The proportions of coniferous wood fibers, broadleaf wood fibers, and hemp fibers were determined by color and morphology (Table 5).

[0099] Table 5

[0100] Cigarette paper sample number Softwood fiber / % hardwood fiber / % hemp fiber / % 1# 29 56 15 2# 37 57 6 3# 23 64 13 4# 20 54 26 5# 33 46 21 6# 29 42 29 7# 33 50 17 8# 11 57 32 9# 45 31 24 10# 23 52 25 11# 15 55 30 12# 20 56 24 13# 16 52 32 14# 33 57 10 15# 39 45 16 16# 33 30 37 17# 43 41 16 18# 38 47 15 19# 28 48 24 20# 5 21 74 21# 3 17 80 22# 9 9 82

[0101] In summary, based on an optimized decomposition method and a selected suitable dye, this application successfully achieved a systematic analysis of the proportions of hardwood fiber, softwood fiber, and hemp fiber in 22 cigarette paper samples, filling the technological gap in the accurate quantitative analysis of the proportions of multiple fiber types in cigarette paper. This technical solution can obtain accurate proportion data of various fibers in cigarette paper, providing scientific and effective technical support for raw material selection, formulation optimization, and quality control in cigarette paper production. It helps improve the stability of core indicators of cigarette paper products, such as combustion performance, air permeability, and physical strength. Simultaneously, it provides data reference for cigarette paper manufacturers to reduce raw material costs and optimize production processes, possessing significant practical application value and promising prospects for promotion.

[0102] The technical solution of this application is simple to operate, has good repeatability, and is highly applicable. It does not require complex and expensive special equipment, making it easy to promote and apply in scenarios such as cigarette paper production testing, quality supervision, and scientific research analysis. It effectively reduces the technical threshold and testing cost of cigarette paper fiber analysis. Compared with existing complex fiber analysis technologies, it is more in line with the actual needs of industrial production testing and scientific research practice, and has a wide range of application scenarios and market value.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for detecting paper fibers, characterized by, Includes the following steps: The paper sample to be tested is mixed with solvent and decomposed at a speed of 8000 r / min to 25000 r / min for 1 min to 11 min to prepare the decomposed sample; The loosened sample and dyeing agent are mixed, and the wood fibers and hemp fibers in the loosened sample are dyed to prepare the dyed sample; as well as, The stained samples were subjected to microscopic examination, and the results were analyzed.

2. The method of detecting paper fibers according to claim 1, characterized in that, The rotation speed for scavenging is 12000 r / min to 21000 r / min, and the scavenging time is 5 min to 8 min.

3. The method of detecting paper fibers according to claim 1, characterized in that, The detection method is a quantitative detection method for paper fibers, and further includes the following steps: The dyed sample was observed under a microscope, and the mass ratio of wood fiber and hemp fiber in the dyed sample was calculated based on the observation results.

4. The method of detecting paper fibers according to claim 3, characterized in that, The observation results showed that the fibers with a reddish color scheme were hemp fibers, and / or the fibers with a blue color scheme were wood fibers.

5. The method of detecting paper fibers according to claim 4, characterized in that, If the wood fiber has a length of 2mm to 4mm and a width of 40μm to 55μm, then the wood fiber is coniferous wood fiber; or If the wood fiber has a length of 0.8mm to 1.2mm and a width of 17μm to 25μm, then the wood fiber is a broadleaf wood fiber.

6. The method of detecting paper fibers according to any one of claims 1 to 5, characterized in that, The step of adding a dyeing agent to the defatted sample to dye the wood and hemp fibers in the defatted sample includes the following steps: The loosened sample is dropped onto a glass slide, dried, and then stained with a dye to stain the wood and hemp fibers in the loosened sample, thus preparing the stained sample.

7. The method of detecting paper fibers according to claim 6, characterized in that, The staining agents include AlCl3, CaCl2, ZnCl2, potassium iodide, and iodine.

8. The method of detecting paper fibers according to claim 7, characterized in that, In the staining agent, the concentration of AlCl3 is 0.14 g / mL to 0.16 g / mL, the concentration of CaCl2 is 0.12 g / mL to 0.13 g / mL, the concentration of ZnCl2 is 0.36 g / mL to 0.40 g / mL, the concentration of potassium iodide is 4.07 mg / mL to 4.50 mg / mL, and the concentration of iodine is 2.94 mg / mL to 3.25 mg / mL.

9. The method of detecting paper fibers according to any one of claims 1 to 5, 7 to 8, wherein The paper sample to be tested is selected from one or more of cigarette paper, forming paper, and printing paper; And / or, the solvent includes water.

10. The method of detecting paper fibres according to any one of claims 7 to 8, characterised in that, The staining time is 10s~30s; And / or, the drying temperature is 115℃~125℃.

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