Evaluation method for hue stability of heated cigarette tipping paper

Abstract

The invention discloses a method for evaluating hue stability of heated cigarette tipping paper, which comprises the following steps of: soaking the heated cigarette tipping paper in a treatment solvent to simulate a storage environment so as to obtain tipping paper to be tested; the method comprises the following steps: detecting tipping paper to be detected and a standard sample by using a chromatic aberration measuring instrument, transmitting a measured value to a data processor, and outputting a delta E value by using the data processor; when the delta E value is greater than 0.5, the tipping paper to be detected is unstable, and the hue is changed; when the delta E value is less than 0.5, the color of the tipping paper to be detected is stable, and the hue is not changed. The hue stability of the tipping paper for heating the cigarettes during warehousing and after warehousing is rapidly detected, the detection cost is reduced, the detection time is shortened, the storage time of 3-6 months or above is shortened to be within 4 h in a simulation mode, and whether the hue of the tipping paper for the cigarettes to be detected is stable or not is accurately and effectively judged. The method solves the industrial problem that traditional naked eyes cannot judge, and is suitable for shelf life prediction and quality monitoring of the heated cigarette tipping paper.

Description

Technical Field

[0001] This patent belongs to the field of cigarette tipping paper testing technology, specifically relating to a method for evaluating the color stability of heated cigarette tipping paper. Background Technology

[0002] Cigarette tipping paper is an important material in cigarette production. Using base paper as the substrate, it undergoes pre-press design, printing (or coating), and post-press processing to function as a connector between the tobacco and filter rod in filter cigarettes. The appearance quality of the cigarette tipping paper determines the end consumer's first impression of the cigarette product and, to a certain extent, influences their choice. Consumers' preference for cigarette products requires consistency between the internal quality of the cigarette and the quality of its outer packaging.

[0003] Compared to conventional cigarettes, heated cigarettes contain a large amount of flavorings and atomizing agents, as well as other organic solvents. During storage, these solvents are prone to physical or chemical reactions with some raw materials used in the tipping paper production process, leading to changes in appearance or the color of the printed product, severely impacting the stability of the cigarette's appearance quality. Traditional storage environment simulation experiments rely on atomizers, a lengthy process requiring 3-6 months of storage to effectively observe the color stability of the tipping paper under the corresponding environment. This method is time-consuming, costly, and prone to oxidizing and deteriorating substances adhering to the tipping paper due to temperature fluctuations, which are often imperceptible to the naked eye, thus lacking rapid monitoring methods. Furthermore, tipping paper that has already undergone color changes cannot be used in production, as this would severely affect the quality of the heated cigarettes. Therefore, timely assessment of the color stability of tipping paper is crucial.

[0004] For example, patent document CN105181143A discloses a method for judging the color difference of tipping paper. It uses a colorimeter to test tipping paper with different color schemes, establishes a color database, and then judges the color difference by comparing samples with standard samples. Patent document CN110824050A discloses a method for evaluating the quality stability of cigarette tipping paper. It uses GC-MS to measure the VOCs content data of tipping paper to establish a standard spectrum, and judges the quality of tipping paper samples by comparing the similarity of the test samples. While these methods can judge the quality of tipping paper, they cannot simulate the storage environment of cigarette tipping paper, thus failing to achieve real-time monitoring of the color stability of cigarette tipping paper, quickly and intuitively reflect the overall color change trend of cigarette tipping paper, and provide early warning and prevention of deteriorated cigarette tipping paper. Summary of the Invention

[0005] The purpose of this patent is to provide a method for evaluating the hue stability of heated cigarette tipping paper. By simulating the storage environment of heated cigarette tipping paper, the method aims to achieve real-time monitoring of the hue stability of cigarette tipping paper, reduce testing costs and time, and accurately and effectively determine whether the hue of the cigarette tipping paper under test is stable.

[0006] To solve the above-mentioned technical problems, this patent adopts the following technical solution:

[0007] A method for evaluating the hue stability of heated cigarette tipping paper includes the following steps:

[0008] Step A: Immerse the heated cigarette tipping paper in a treatment solvent to simulate the storage environment, and obtain the tipping paper to be tested;

[0009] Step B: Use a color difference measuring instrument to test the spliced ​​paper to be tested and the standard sample, transmit the measured values ​​to the data processor, and then use the data processor to output the ΔE value of the color difference between the spliced ​​paper to be tested and the standard sample.

[0010] Step C: Compare the ΔE value with the stability inflection point. When the ΔE value is greater than the stability inflection point, the spliced ​​paper under test is unstable and the hue changes; when the ΔE value is less than the stability inflection point, the spliced ​​paper under test is stable and the hue does not change.

[0011] Furthermore, step A includes:

[0012] Step A-1: ​​Place the heated cigarette tipping paper in a colorimetric tube and soak it in the treatment solvent;

[0013] Step A-2: Wash the heated cigarette tipping paper soaked in step A-1 with distilled water and dry it to obtain the tipping paper to be tested.

[0014] Furthermore, in step A-1, the printed side of the heated cigarette tipping paper is located on the side furthest from the colorimetric tube; the size of the heated cigarette tipping paper is 10~50 cm. 2 .

[0015] Furthermore, the processing solvent is an organic solvent.

[0016] Furthermore, organic solvents include one or more combinations of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, ethers, esters, ketones, or diol derivatives.

[0017] Furthermore, aromatic hydrocarbons include benzene, toluene, or xylene; aliphatic hydrocarbons include pentane, hexane, or octane; alicyclic hydrocarbons include cyclohexane, cyclohexanone, or toluenecyclohexanone; halogenated hydrocarbons include chlorobenzene, dichlorobenzene, or dichloromethane; alcohols include methanol, ethanol, or isopropanol; ethers include diethyl ether or propylene oxide; esters include methyl acetate, ethyl acetate, or propyl acetate; ketones include acetone, methyl butyl ketone, or methyl isobutyl ketone; and glycol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, or ethylene glycol monobutyl ether.

[0018] Furthermore, organic solvents also include acetonitrile, pyridine, or phenol.

[0019] Furthermore, the concentration of the treatment solvent is 1.0~2.0%, 2.0~4.0%, or 4.0~5.0%.

[0020] Furthermore, the soaking temperature is 0~10℃, 10~20℃, 20~30℃ or 30~40℃;

[0021] Furthermore, the soaking time is 0.5~1.0 h, 1.0~2.0 h, 2.0~3.0 h, or 3.0~5.0 h.

[0022] Furthermore, in step A-2, the washing with distilled water is performed 1 to 5 times, each time for 1 to 3 minutes; the drying conditions are oven drying or natural air drying.

[0023] Furthermore, step B specifically involves:

[0024] The standard sample was tested 2-3 times in parallel using a colorimeter to obtain the average first E value; the test paper was tested 2-3 times using a colorimeter to obtain the average second E value; the average second E value was then subtracted from the average first E value to obtain the ΔE value.

[0025] Furthermore, the relative deviation of the values ​​from 2 to 3 parallel tests should be less than 10%.

[0026] Furthermore, in step C, the ΔE value of the stability inflection point is 0.5.

[0027] Another aspect of this patent provides a computer device for evaluating the hue stability of heated cigarette tipping paper. The computer device includes a memory, a data processor, and a computer program stored in the memory and executable on the data processor. When the data processor executes the computer program, it implements the aforementioned evaluation method for the hue stability of heated cigarette tipping paper.

[0028] This patent provides a method for evaluating the hue stability of heated cigarette tipping paper. By immersing the tipping paper in different solvents to simulate a storage environment, and using a colorimeter to measure the ΔE value, a ΔE value of 0.5 is used as the criterion for judging the hue stability of the heated cigarette tipping paper. This method enables rapid detection of the hue stability of heated cigarette tipping paper upon and after warehousing, reducing testing costs and time. The simulated storage time of 3-6 months or more is shortened to less than 4 hours, accurately and effectively determining whether the hue of the tipping paper is stable. This solves the industry problem of traditional methods that cannot be determined by the naked eye and is applicable to shelf-life prediction and quality monitoring of heated cigarette tipping paper. Attached Figure Description

[0029] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0030] Figure 1 This is the process for evaluating the color stability of heated cigarette tipping paper in this patent embodiment. Detailed Implementation

[0031] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0032] In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined to have the following meanings:

[0033] As used in this patent, the term "ΔE value" is a numerical value representing a color difference, typically used to describe the visually perceived difference between two colors. A larger ΔE value indicates a greater color difference, and a smaller ΔE value indicates a smaller color difference. A ΔE value in the range of 0 to 0.5 represents a difference that is imperceptible to more than 97% of the population; therefore, a ΔE value of 0.5 is used as the standard value for determination.

[0034] As used in this patent, the term "relative standard deviation (RSD)," also known as the standard deviation coefficient or coefficient of variation, is the value obtained by dividing the standard deviation by the corresponding average value and multiplying by 100%, and can be used to analyze the precision of results in testing and inspection.

[0035] The terms “comprising” or “having” have the same meaning as “containing”, and also include other forms of the term, such as the gerund and singular forms in English, meaning including but not limited to, and not intended to exclude, for example, other elements, components, integers or steps.

[0036] All figures used to represent component amounts, properties (e.g., weight-average molecular weight), reaction conditions, etc., should be considered to be modified in all cases by the terms "within the unavoidable margin of error" or "approximately". Therefore, the numerical values ​​presented herein are approximate and may vary depending on the desired properties sought to be obtained by this patent. The principle of equivalents, which is applied to a minimum and not intended to limit the scope of the claims, should be applied, for example, each value should be interpreted at least according to the reported significant digits and by applying conventional rounding techniques.

[0037] All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, and in particular, meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0038] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0039] The "range" disclosed herein is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0040] Unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined to form new technical solutions.

[0041] Unless otherwise specified, all the technical features and preferred features mentioned herein can be combined to form new technical solutions.

[0042] Unless otherwise specified, all steps mentioned herein may be performed sequentially or randomly, but are preferably performed sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0043] Unless otherwise specified, the terms "comprising" and "including" as used herein can be open-ended or closed-ended. For example, "comprising" and "including" may mean that other components not listed may also be included, or that only the listed components may be included.

[0044] In the description of this article, it should be noted that, unless otherwise stated, "above" and "below" include the number itself, and "several" in "one or more" means two or more.

[0045] In this description, unless otherwise stated, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0046] Unless otherwise specified, percentages (%) in this document refer to percentages by mass relative to the composition.

[0047] Unless otherwise stated herein, the sum of the contents of the components in the composition is 100%.

[0048] In this document, unless otherwise stated, “combination of” means a multi-component mixture of the elements, such as two, three, four, and up to the maximum possible multi-component mixture.

[0049] Unless otherwise specified, the term "a" as used in this specification means "at least one".

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Unless otherwise specified, the experimental methods described in the embodiments of the present invention are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0053] like Figure 1 As shown, this patent provides a method for evaluating the hue stability of heated cigarette tipping paper, comprising the following steps:

[0054] S1, Standard Sample

[0055] The standard samples were provided by Wuhan Danyaxiang Biotechnology Co., Ltd., and included both hot-stamped and printed standard samples. The hot-stamped standard sample was the cigarette tipping paper of commercially available Huanghelou (Soft Blue) cigarettes, while the printed standard sample was the cigarette tipping paper of commercially available Huanghelou (Hard Silver Purple) cigarettes.

[0056] S2. Sample pretreatment, including the following steps:

[0057] (1) Prepare a treatment solvent. The treatment solvent is an organic solvent, which includes one or more combinations of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, ethers, esters, ketones or diol derivatives.

[0058] Specifically, aromatic hydrocarbons include benzene, toluene, or xylene; aliphatic hydrocarbons include pentane, hexane, or octane; alicyclic hydrocarbons include cyclohexane, cyclohexanone, or toluenecyclohexanone; halogenated hydrocarbons include chlorobenzene, dichlorobenzene, or dichloromethane; alcohols include methanol, ethanol, or isopropanol; ethers include diethyl ether or propylene oxide; esters include methyl acetate, ethyl acetate, or propyl acetate; ketones include acetone, methyl butyl ketone, or methyl isobutyl ketone; and glycol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, or ethylene glycol monobutyl ether.

[0059] Specifically, organic solvents also include acetonitrile, pyridine, or phenol.

[0060] Prepare solutions of each organic solvent with concentration gradients from 1.0% to 5.0%. For example, a 1.0% ethanol aqueous solution: Take 1 mL of anhydrous ethanol, add 99 mL of distilled water, and mix thoroughly to obtain a 1.0% ethanol aqueous solution. The 1.0% to 5.0% concentration gradient can be 1.0%, 2.0%, 3.0%, 4.0%, and 5.0%, or it can be 1.0%, 2.0%, and 5.0%.

[0061] (2) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples".

[0062] (3) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0063] (4) Cut the second splicing paper into pieces with an area of ​​10~50 cm². 2 The size of the sample strips must include at least one side to obtain the third splice paper, which is the splice paper sample to be tested. A sufficient number of sample strips should be cut at once to ensure that each sample has at least 3 valid test results.

[0064] (5) Take 50-100 mL of the treatment solvent prepared in step (1) and place it in a colorimetric tube. Roll the printed side of the test splice paper sample obtained after cutting in step (4) into a tube and place it in the colorimetric tube for immersion. That is, the printed side of the test splice paper sample is located on the side away from the colorimetric tube, and the fourth splice paper is obtained.

[0065] The soaking temperature is 0~40℃, and the soaking time is 1~5 hours.

[0066] (6) Take out the fourth splice paper obtained from soaking in step (5) above, wash it with distilled water for 5 to 10 minutes, and dry it under natural conditions.

[0067] (7) The color change of the fourth tipping paper dried in step (6) and the standard sample obtained in step S1 is detected by colorimeter. Each sample is measured in parallel 2 to 3 times. The average reading E value of each sample measured in parallel 2 to 3 times is the final result. The E value of each sample measured in parallel should be less than 0.1, indicating that the data measured by the colorimeter is accurate and the data can be used for subsequent comparison and analysis.

[0068] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value, which represents the E value of the tipping paper sample after it has been soaked in the above-mentioned solvent to simulate the storage environment.

[0069] S3. Determination of the color stability of the spliced ​​paper, including the following steps:

[0070] The ΔE value is the difference in E values ​​between the test tipped paper sample and the standard sample, measured by a colorimeter. The formula for calculating the ΔE value is shown below:

[0071] ΔE value = (Second E value - First E value) (Formula - 1)

[0072] Among them, a ΔE value in the range of 0 to 0.5 means that it is imperceptible to more than 97% of the population. Therefore, a ΔE value of 0.5 is used as the standard value for judgment, that is, a ΔE value of 0.5 is used as the turning point for the stability of the spliced ​​paper sample to be tested.

[0073] When ΔE value < 0.5, the hue of the test spliced ​​paper sample does not change and is judged to be stable; when ΔE value > 0.5, the hue of the test spliced ​​paper sample changes and is judged to be unstable.

[0074] Example 1

[0075] The determination of the color stability of hot stamping tipping paper using an ethanol-water solution includes the following steps:

[0076] (1) The hot stamping standard sample prepared in step S1 above is used as the standard sample for splicing paper;

[0077] (2) Prepare aqueous solutions of ethanol with gradient concentrations of 1.0%, 2.0% and 5.0% using anhydrous ethanol;

[0078] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0079] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0080] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0081] (6) Take 100 mL of each of the 1.0%, 2.0% and 5.0% ethanol aqueous solution solvents from step (2) and place them in a colorimetric tube. Roll the sample of the splicing paper to be tested from step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splicing paper.

[0082] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0083] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0084] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0085] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 1. Compared with the standard sample, the ΔE value of the hot stamping tipping paper sample was greater than 0.5 when soaked in ethanol aqueous solutions with concentrations of 1.0%, 2.0% and 5.0% for 1 h, 2 h and 4 h, respectively. The hue of the hot stamping tipping paper changed and was determined to be unstable.

[0086] Therefore, by immersing the hot stamping tipping paper in a 1.0% ethanol aqueous solution for 1 hour to simulate the storage environment, and then using a colorimeter to detect the ΔE value, the stability of the hot stamping tipping paper can be determined. Table 1. Statistical table of ΔE values ​​for hot stamping tipping paper under ethanol aqueous solution immersion conditions.

[0087] Example 2

[0088] The determination of the color stability of hot stamping tipping paper using acetone aqueous solution includes the following steps:

[0089] (1) The hot stamping standard sample prepared in step S1 above is used as the standard sample for splicing paper;

[0090] (2) Prepare acetone aqueous solutions with gradient concentrations of 1.0%, 2.0% and 5.0% using acetone;

[0091] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0092] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0093] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0094] (6) Take 100 mL of each of the acetone aqueous solution solvents with concentrations of 1.0%, 2.0% and 5.0% in step (2) and place them in a colorimetric tube. Roll the sample of the splicing paper to be tested in step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splicing paper.

[0095] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0096] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0097] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0098] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 2. Compared with the standard sample, the ΔE value of the hot stamping tipping paper sample was greater than 0.5 under different concentration conditions and soaking times of 1 h, 2 h and 4 h. The color of the hot stamping tipping paper changed, indicating instability. However, the ΔE values ​​were similar in different concentrations of acetone aqueous solution under the same soaking time.

[0099] Therefore, by immersing the hot stamping tipping paper in a 1.0% acetone aqueous solution for 1 hour to simulate the storage environment, and then using a colorimeter to detect the ΔE value, the stability of the hot stamping tipping paper can be determined. Table 2. Statistical table of ΔE values ​​of hot stamping tipping paper under acetone aqueous solution immersion conditions.

[0100] Example 3

[0101] The determination of the color stability of hot stamping tipping paper using propylene glycol aqueous solution includes the following steps:

[0102] (1) The hot stamping standard sample prepared in step S1 above is used as the standard sample for splicing paper;

[0103] (2) Prepare aqueous solutions of propylene glycol with gradient concentrations of 1.0%, 2.0% and 5.0% using propylene glycol;

[0104] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0105] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0106] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0107] (6) Take 100 mL of propylene glycol aqueous solution solvent with concentrations of 1.0%, 2.0% and 5.0% from step (2) and place them in a colorimetric tube. Roll the test splice paper sample from step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splice paper.

[0108] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0109] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0110] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0111] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 3. Compared with the standard sample, the ΔE values ​​of the samples soaked for 4 h at 1.0% concentration, 2 h at 2.0% concentration, and 1 h at 5.0% concentration were greater than 0.5. The hue of the hot stamping tipping paper sample changed, indicating instability.

[0112] Therefore, by simulating storage environments by immersing the hot stamping tipping paper in a 1.0% propylene glycol aqueous solution for 4 hours, a 2.0% propylene glycol aqueous solution for 2 hours, and a 5.0% propylene glycol aqueous solution for 1 hour, and then using a colorimeter to detect the ΔE value, the stability of the hot stamping tipping paper can be determined. Table 3. Statistical table of ΔE values ​​of hot stamping tipping paper under propylene glycol aqueous solution immersion conditions.

[0113] Example 4

[0114] The determination of the color stability of printed tipping paper using an ethanol-water solution includes the following steps:

[0115] (1) The printed standard sample prepared in step S1 above is used as the standard sample for tipping paper;

[0116] (2) Prepare aqueous solutions of ethanol with gradient concentrations of 1.0%, 2.0% and 5.0% using anhydrous ethanol;

[0117] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0118] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0119] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0120] (6) Take 100 mL of each of the 1.0%, 2.0% and 5.0% ethanol aqueous solution solvents from step (2) and place them in a colorimetric tube. Roll the sample of the splicing paper to be tested from step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splicing paper.

[0121] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0122] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0123] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0124] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 4. Compared with the standard sample, the ΔE values ​​of the samples soaked for 4 h at 1.0% concentration, 2 h at 2.0% concentration, and 1 h at 5.0% concentration were greater than 0.5. The hue of the printed tipping paper sample changed, indicating instability.

[0125] Therefore, by simulating storage environments by soaking printed tipping paper in a 1.0% ethanol aqueous solution for 4 hours, a 2.0% ethanol aqueous solution for 2 hours, and a 5.0% ethanol aqueous solution for 1 hour, and then using a colorimeter to detect the ΔE value, the stability of the printed tipping paper can be determined. Table 4. Statistical table of ΔE values ​​for printed tipping paper under ethanol-water immersion conditions.

[0126] Example 5

[0127] The determination of the color stability of printed tipping paper using acetone aqueous solution includes the following steps:

[0128] (1) The printed standard sample prepared in step S1 above is used as the standard sample for tipping paper;

[0129] (2) Prepare acetone aqueous solutions with gradient concentrations of 1.0%, 2.0% and 5.0% using acetone;

[0130] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0131] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0132] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0133] (6) Take 100 mL of each of the acetone aqueous solution solvents with concentrations of 1.0%, 2.0% and 5.0% in step (2) and place them in a colorimetric tube. Roll the sample of the splicing paper to be tested in step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splicing paper.

[0134] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0135] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0136] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0137] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 5. Compared with the standard sample, the ΔE value of the printed tipping paper sample was greater than 0.5 under different concentration conditions and soaking times of 1 h, 2 h and 4 h. The color of the printed tipping paper changed, indicating instability. However, the ΔE values ​​were similar in different concentrations of acetone aqueous solution under the same soaking time.

[0138] Therefore, by immersing printed tipping paper in a 1.0% acetone aqueous solution for 1 hour to simulate the storage environment, and using a colorimeter to detect the ΔE value, the stability of the printed tipping paper can be determined. Table 5. Statistical table of ΔE values ​​of printed tipping paper under acetone aqueous solution immersion conditions.

[0139] Example 6

[0140] The determination of the color stability of printed tipping paper using propylene glycol aqueous solution includes the following steps:

[0141] (1) The printed standard sample prepared in step S1 above is used as the standard sample for tipping paper;

[0142] (2) Prepare aqueous solutions of propylene glycol with gradient concentrations of 1.0%, 2.0% and 5.0% using propylene glycol;

[0143] (3) The first splice paper was obtained by sampling according to the method specified in GB / T 450-2008 "Sampling of Paper and Paperboard Samples and Determination of the Longitudinal and Transverse and Front and Back Sides of Samples";

[0144] (4) The first tipping paper is pre-warmed and humidified according to the method specified in GB / T 10739-2023 "Standard Atmospheric Conditions for the Treatment and Testing of Paper, Paperboard and Pulp Samples" to obtain undamaged tipping paper, which is the second tipping paper.

[0145] (5) Cut the second splice paper into pieces with an area of ​​25 cm². 2 The size of the paper, including one side, is used to obtain the third splice paper, which is the splice paper sample to be tested.

[0146] (6) Take 100 mL of propylene glycol aqueous solution solvent with concentrations of 1.0%, 2.0% and 5.0% from step (2) and place them in a colorimetric tube. Roll the test splice paper sample from step (5) into a tube with the printed side facing inward and place it in the colorimetric tube for immersion. The immersion temperature is 25℃. The immersion time under each concentration condition is set to 1 h, 2 h and 4 h respectively to obtain the fourth splice paper.

[0147] (7) Take out the fourth tipping paper obtained from soaking in step (6), wash it with distilled water for 5 minutes, and dry it under natural conditions;

[0148] (8) Use a colorimeter to detect the color change of the fourth tipping paper dried in step (7) and the standard sample in step (1). Each sample is measured in parallel 3 times, and the average reading E value is calculated as the final result. The E value of each sample measured in parallel should be less than 0.1.

[0149] The average E value of the standard sample, measured by a colorimeter, is marked as the first E value; the average E value of the fourth tipping paper, measured by a colorimeter, is marked as the second E value.

[0150] (9) The ΔE value of the fourth tipping paper was calculated using Formula-1. The results are shown in Table 1. Compared with the standard sample, the ΔE values ​​of the samples soaked for 4 h at 1.0% concentration, 2 h at 2.0% concentration, and 1 h at 5.0% concentration were greater than 0.5. The hue of the printed tipping paper sample changed, indicating instability.

[0151] Therefore, by simulating storage environments by soaking printed tipping paper in a 1.0% propylene glycol aqueous solution for 4 hours, a 2.0% propylene glycol aqueous solution for 2 hours, and a 5.0% propylene glycol aqueous solution for 1 hour, and then using a colorimeter to detect the ΔE value, the stability of the printed tipping paper can be determined. Table 6. Statistical table of ΔE values ​​of printed tipping paper under propylene glycol aqueous solution immersion conditions.

[0152] Comparative Example 1

[0153] Compared with Examples 1-3, the difference is that this comparative example uses water to soak the hot stamping tipping paper.

[0154] The results are shown in Table 7. Compared with the standard hot stamping sample, the ΔE value of the hot stamping tipping paper in water is less than 0.5, and the color stability of the hot stamping tipping paper cannot be evaluated by water. Table 7. Statistics of ΔE values ​​of hot stamping tipping paper after immersion in water.

[0155] Comparative Example 2

[0156] The difference between this comparative example and Examples 4-6 is that this comparative example uses water-immersed printing type tipping paper.

[0157] The results are shown in Table 8. Compared with the printed standard sample, the ΔE value of the printed tipping paper in water is less than 0.5, and the color stability of the printed tipping paper cannot be evaluated by water. Table 8. Statistical table of ΔE values ​​of printed tipping paper after immersion in water.

[0158] Test case repeatability verification

[0159] Following the method described in Example 1, the hot stamping tipping paper sample was immersed in a 1.0% ethanol aqueous solution for 4 hours to detect the ΔE value, and the process was repeated 20 times.

[0160] Based on the data shown in Table 9, the average value was calculated to be 2.2435, the standard deviation was 0.021343, and the relative standard deviation (RSD) was 0.9%. Table 9. Statistical table of ΔE values ​​for hot stamping tipping paper after soaking in 1.0% ethanol aqueous solution for 4 h.

[0161] Therefore, it can be concluded that the method for evaluating the hue stability of heated cigarette tipping paper provided by this patent simulates the storage environment by immersing the heated cigarette tipping paper in different treatment solvents, and uses a colorimeter to assist in measuring the ΔE value. A ΔE value of 0.5 is used as the criterion for judging the hue stability of heated cigarette tipping paper. This method enables rapid detection of the hue stability of heated cigarette tipping paper upon and after warehousing, reducing testing costs and time. The simulated storage time of 3-6 months or more is shortened to less than 4 hours, accurately and effectively determining whether the hue of the cigarette tipping paper under test is stable. This solves the industry problem of traditional methods that cannot be judged by the naked eye and is applicable to shelf-life prediction and quality monitoring of heated cigarette tipping paper.

[0162] In the foregoing description of exemplary embodiments / specific implementations of this patent, various features of this patent are sometimes combined in a single embodiment / specific implementation or its figures and description, with the aim of simplifying the disclosure and aiding in the understanding of one or more of the various aspects of the invention. However, unless expressly stated otherwise or in obvious technical contradiction or exclusion, the descriptive method of this patent should not be construed as reflecting an intention that the claimed features of the invention are more than expressly stated in each claim. Rather, the inventive aspect reflected in the claims lies in not all the features of a single foregoing disclosed embodiment / specific implementation. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, each claim existing independently as a separate embodiment / specific implementation of this patent.

[0163] The terms and expressions used in this specification are for illustrative purposes and not for limitation. In using these terms and expressions, there is no intention to exclude any equivalents of the features or portions thereof shown and described, but rather to recognize that various variations may exist within the scope of this patent claim.

[0164] Therefore, it should be understood that although this patent has been specifically disclosed through preferred embodiments, exemplary embodiments, and optional features, those skilled in the art may adopt variations or modifications of the concepts disclosed in this specification, and such variations and modifications are therefore considered to be within the scope of this patent as defined by the appended claims. The specific embodiments given in this specification are examples of useful embodiments of this patent, and it will be apparent to those skilled in the art that this patent can be implemented using many variations of the devices, device components, and method steps disclosed in this specification.

[0165] The foregoing description of specific embodiments fully discloses the general features of this patent, enabling others to easily modify and / or adapt such embodiments for various applications by applying knowledge within the scope of the art, without excessive experimentation or deviation from the general concept of this patent. Therefore, based on the teachings and guidance provided herein, it is intended that such modifications and alterations be included within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and not intended to be limiting; thus, the wording or terminology in this specification will be interpreted by those skilled in the art based on the foregoing teachings and guidance.

[0166] Furthermore, the scope of this patent should not be limited to any of the exemplary embodiments described above, but only to the appended claims and their equivalents.

Claims

1. A method for evaluating the hue stability of heated cigarette tipping paper, characterized in that, Includes the following steps: Step A: Immerse the heated cigarette tipping paper in a processing solvent to simulate the storage environment, and obtain the tipping paper to be tested; Step B: Use a color difference measuring instrument to test the spliced ​​paper to be tested and the standard sample, transmit the measured values ​​to the data processor, and then use the data processor to output the ΔE value of the color difference between the spliced ​​paper to be tested and the standard sample. Step C: Compare the ΔE value with the stability inflection point. When the ΔE value is greater than the stability inflection point, the test splice paper is unstable and the hue changes; when the ΔE value is less than the stability inflection point, the test splice paper is stable and the hue does not change.

2. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 1, characterized in that, Step A includes: Step A-1: ​​Place the heated cigarette tipping paper in a colorimetric tube and soak it in the treatment solvent; Step A-2: Wash the heated cigarette tipping paper soaked in step A-1 with distilled water and dry it to obtain the tipping paper to be tested.

3. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 2, characterized in that, In step A-1, The printed side of the heated cigarette tipping paper is located on the side away from the colorimetric tube; the size of the heated cigarette tipping paper is 10~50 cm. 2 .

4. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 3, characterized in that, The processing solvent is an organic solvent, which includes one or more of ethanol, acetone and propylene glycol. The concentration of the processing solvent is 1.0~2.0%, 2.0~4.0%, or 4.0~5.0%.

5. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 4, characterized in that, The soaking temperature is 0~10℃, 10~20℃, 20~30℃ or 30~40℃; The soaking time is 0.5~1.0 h, 1.0~2.0 h, 2.0~3.0 h, or 3.0~5.0 h.

6. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 2, characterized in that, In step A-2, The distilled water washing is performed 1 to 5 times, each time for 1 to 3 minutes.

7. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 1, characterized in that, Step B specifically involves: The standard sample is tested 2-3 times in parallel using the colorimeter to obtain an average first E value; the test paper is tested 2-3 times using the colorimeter to obtain an average second E value; the average second E value is subtracted from the average first E value to obtain the ΔE value. The relative deviation of the values ​​from 2 to 3 parallel tests should be less than 10%.

8. The method for evaluating the hue stability of heated cigarette tipping paper according to claim 1, characterized in that, In step C, the ΔE value of the stability inflection point is 0.

5.

9. A computer device for evaluating the hue stability of heated cigarette tipping paper, characterized in that, The computer device includes a memory, a data processor, and a computer program stored in the memory and executable on the data processor. When the data processor executes the computer program, it implements the method for evaluating the hue stability of heated cigarette tipping paper as described in any one of claims 1 to 8.

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