Method for measuring curing rate of cigarette paper lap adhesive and application of method

Abstract

The invention provides a cigarette paper lap adhesive curing rate determination method and application thereof, and the cigarette paper lap adhesive curing rate determination method comprises the following steps: drying a cigarette paper sample until the weight is constant, and then weighing and recording the weight as m; coating a lap adhesive on the cigarette paper sample, and then weighing and recording as M; drying the cigarette paper sample coated with the lap adhesive, and then weighing and recording as Mn; and calculating the mass loss rate W and the curing rate Q according to the weighing result. According to the determination method provided by the invention, the curing rate of the cigarette paper lap adhesive can be accurately and efficiently determined, the shortest curing time of the cigarette paper lap adhesive can be efficiently determined, and technical support is provided for optimizing the cigarette production process, improving the cigarette product quality and prolonging the service life of soldering iron of a cigarette making machine.

Description

Technical Field

[0001] This invention belongs to the field of tobacco processing technology, specifically relating to a method for determining the curing rate of the adhesive on cigarette paper and its application. Background Technology

[0002] For cigarettes, in addition to their main raw materials, the adhesives used also need to be studied. The sealing adhesive is a special adhesive used in cigarette manufacturing to bond cigarette paper, playing a crucial role in cigarette forming. The introduction of high-speed cigarette machines has greatly improved cigarette production efficiency. This increased speed places higher demands on cigarette adhesives, requiring sealing adhesives to have good initial tack and quick-drying properties.

[0003] Currently, the curing temperature of the adhesive used for cigarette making is generally between 220℃ and 260℃. Higher operating temperatures of the soldering iron in cigarette making machines increase the likelihood of deformation at the contact surface between the iron and the cigarette paper, as well as accelerated performance degradation of the iron, negatively impacting equipment maintenance and cigarette product quality. Furthermore, since a certain amount of flavorings and fragrances are added to the tobacco during the cigarette manufacturing process, the high temperature of the soldering iron can cause some loss of these flavorings and fragrances, and also evaporate some moisture from the tobacco, affecting the sensory experience and quality stability of the cigarette. Therefore, increasing the drying speed and reducing the curing time of the adhesive is crucial for improving cigarette product quality. Moreover, effectively shortening the curing time of the adhesive while maintaining adhesion can also significantly extend the lifespan of the soldering iron and reduce production costs. However, current technologies lack methods for measuring the curing rate of the adhesive, and a precise and standardized measurement procedure is missing, failing to provide reliable data support for optimizing the adhesive formulation and adjusting cigarette production processes.

[0004] CN222913651U discloses an adhesive curing rate testing device, including a base, a placement platform fixedly connected to the upper side of one end of the base, and an adjustment component fixedly connected to the end of the base away from the placement platform. A sampling component is fixedly connected to the upper end of the adjustment component, and a rotating component is fixedly connected to one end of the sampling component. A cleaning component is fixedly connected to the outer side of the end of the base away from the placement platform. The adjustment component includes a first motor fixedly connected to the outer side of the end of the base away from the placement platform, and a threaded rod fixedly connected to the output shaft of the first motor. The end of the threaded rod away from the first motor is rotatably connected to the base, and a threaded block engages with the outer side of the middle end of the threaded rod. A storage component is fixedly connected to the upper end of the cleaning component, and a collection component is fixedly connected to the lower end of the cleaning component. This allows the testing device to automatically complete the sampling process during use, making the testing method simple and convenient. Furthermore, the outer side of the sampling structure can be cleaned after the test. However, using this device for testing requires specialized equipment, making it difficult to promote.

[0005] Therefore, developing a simple and accurate method for determining the curing rate of cigarette paper adhesive is of great practical significance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for determining the curing rate of cigarette paper sealant and its application. The method provided by this invention can accurately and efficiently determine the curing rate of cigarette paper sealant and its minimum curing time, providing technical support for optimizing cigarette production processes, improving cigarette product quality, and extending the service life of soldering irons in cigarette making machines.

[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for determining the curing rate of cigarette paper adhesive, the method comprising the following steps: The cigarette paper sample was dried until its weight was constant, and then weighed and recorded as m. Apply adhesive to the cigarette paper sample, then weigh it and record the weight as M; The cigarette paper sample coated with adhesive was dried and then weighed and recorded as Mn. The mass loss rate W and the curing rate Q are calculated based on the weighing results, using the following formulas: ; ; In the formula, P is the solid content of the adhesive tape.

[0008] The above method can accurately and efficiently determine the curing rate of cigarette paper adhesive using only drying equipment, providing technical support for optimizing cigarette production processes, improving cigarette product quality, and extending the service life of cigarette machine soldering irons.

[0009] Preferably, the drying temperature for each drying cycle is independently 90-210°C, such as 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, or 210°C, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0010] Preferably, each weighing is performed at least twice, the average value is taken as the final weight, and multiple weighings are used to confirm that the weight is constant, with the weight difference between two adjacent weighings not exceeding 0.5 mg.

[0011] Secondly, the present invention provides the application of the method for determining the curing rate of cigarette paper adhesive as described above in determining the shortest curing time of cigarette paper adhesive.

[0012] Thirdly, the present invention also provides a method for determining the shortest curing time of cigarette paper adhesive, the method comprising the following steps: Several cigarette paper samples were dried to a constant weight and then coated with adhesive. The samples were dried for different times. The curing rate of the adhesive in the cigarette paper samples dried for different times was measured according to the method for determining the curing rate of the adhesive as described above. The drying time corresponding to when the adhesive was completely cured was determined based on the measurement results.

[0013] Preferably, the drying time range for different drying times is 30-600 s, such as 30s, 60s, 90s, 150s, 180s, 210s, 270s, 300s, 420s, 450s, 480s, 510s, 570s, or 600s, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0014] Preferably, the drying temperature is 90-210℃, such as 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, 200℃ or 210℃, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0015] Preferably, the joint adhesive is considered to be fully cured when the curing rate reaches 80% or more.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for determining the curing rate of cigarette paper sealant. This method can accurately and efficiently determine the curing rate of cigarette paper sealant and its minimum curing time, providing technical support for optimizing cigarette production processes, improving cigarette product quality, and extending the service life of soldering irons in cigarette making machines. Details are as follows: 1. The measurement method provided by this invention is simple to operate, has a standardized procedure, and provides reliable test results; 2. By measuring the shortest curing time of the adhesive, the working temperature of the soldering iron and the speed of the cigarette production machine can be adjusted accordingly. This reduces the working temperature of the soldering iron, minimizes deformation and performance degradation, extends the service life of the soldering iron, and lowers equipment maintenance costs. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0018] The parameters of the cigarette paper and adhesive used in the following examples are shown in Tables 1 and 2, respectively. The 0# cigarette paper is the paper in use. Based on the 0# cigarette paper, we explored the shortest curing time of the adhesive under different cigarette paper parameters, so as to provide a reference for the improvement of the 0# cigarette paper.

[0019] Table 1. Cigarette Paper Sample Parameter Information Table 2. Cigarette Paper Sealing Adhesive Parameter Information Table Example 1 This embodiment 1 provides a method for determining the curing rate of cigarette paper adhesive. The shortest curing time of cigarette papers with different basis weights at 170°C is determined using the following method: Cut 30 sheets of each of the five grades of cigarette paper (0#, 1#, 2#, 3#, and 4#) into rectangles 5cm long. Dry the five grades of cigarette paper in an oven at 110℃ for 2 hours. After drying, cool them to room temperature in a desiccator. Weigh each grade of cigarette paper in an aluminum box and record the weight. Continue drying the five grades of cigarette paper in the oven at 110℃ for half an hour. After cooling, weigh them again in a desiccator until the difference between two weighings does not exceed 0.5 mg. Once the weight is constant, immediately transfer the cigarette paper samples to resealable bags for storage. Take two sheets of the same grade of cigarette paper from the resealable bag, weigh them, and record the weight as m1 and m2. Use a 3mL dropper to add 2 drops of adhesive to each cigarette paper, spread them evenly, fold and press them to make them even, and then weigh the cigarette paper and record the weight as M1 and M2. Preheat the aluminum box in an oven at a set temperature for twice the drying time of the cigarette paper. Then, place the cigarette paper coated with water-based adhesive into the aluminum box and immediately start timing. After the set time, remove the lid of the aluminum box and place it in a desiccator to cool to room temperature. Weigh the cigarette paper and record the weights as Mn1 and Mn2. Calculate the average values ​​of m1 and m2, M1 and M2, and Mn1 and Mn2, and record them as m, M, and Mn, respectively. Calculate W and Q using the formula: ; ; In the formula, P is the solid content of the adhesive tape.

[0020] Example 2 This embodiment 2 provides a method for determining the curing rate of cigarette paper adhesive, and measures the shortest curing time for cigarette papers with different air permeability using the following method: Cut 30 sheets of each of the #0, #5, and #6 cigarette papers into 5cm rectangles. Dry two types of cigarette papers in a 90℃ oven for 2.5 hours. After drying, cool them to room temperature in a desiccator. Weigh each of the five types of cigarette papers in an aluminum box and record the weight. Continue drying the five types of cigarette papers in an oven at 110℃ for half an hour. After drying, remove them and cool them in a desiccator. Weigh them again until the difference between two weighings does not exceed 0.5 mg. Immediately transfer the cigarette paper samples to self-sealing bags for storage after constant weight. Take two sheets of the same brand of cigarette paper from the self-sealing bag, weigh them, and record the weight as m1 and m2. Use a 3mL dropper to add 2 drops of adhesive to each cigarette paper, spread them evenly, fold and press them to make them even, and then weigh the cigarette paper and record the weight as M1 and M2. Preheat the aluminum box in an oven at a set temperature for twice the drying time of the cigarette paper. Then, place the cigarette paper coated with water-based adhesive into the aluminum box and immediately start timing. After the set time, remove the lid of the aluminum box and place it in a desiccator to cool to room temperature. Weigh the cigarette paper and record the weights as Mn1 and Mn2. Calculate the average values ​​of m1 and m2, M1 and M2, and Mn1 and Mn2, and record them as m, M, and Mn, respectively. Calculate W and Q using the formula: ; ; In the formula, P is the solid content of the adhesive tape.

[0021] Example 3 The difference between Example 3 and Example 1 is that the cigarette paper samples in Example 3 are 0#, 9#, 10#, 11# and 12#, and the shortest curing time of the adhesive is investigated under different contents of the cigarette paper combustion aid.

[0022] Example 4 The difference between Example 4 and Example 1 is that the cigarette paper used in Example 4 is 13#, 14#, and 15#, and the shortest curing time of the adhesive on the cigarette paper is investigated under different potassium-sodium ratios.

[0023] Example 5 The difference between Example 5 and Example 1 is that the cigarette paper used in Example 5 is 0#, 7#, and 8#, and the shortest curing time of the adhesive is investigated under different calcium carbonate content of the cigarette paper.

[0024] Example 6 The difference between Example 6 and Example 1 is that the cigarette paper used in Example 6 is 0# and 16# cigarette paper, and the shortest curing time of the adhesive is investigated under different hemp content conditions of the cigarette paper.

[0025] The test results of Examples 1-6 are shown in Tables 3-8 (the data of 0# cigarette paper are all from Example 1). The test results are explained by the determination of the curing rate of the adhesive at 170℃.

[0026] Table 3: Results of Curing Rate Measurement of Different Basis Weight Cigarette Paper Sealing Adhesives at 170℃ in Example 1 Table 4: Results of Curing Rate Measurement of Cigarette Paper Sealing Adhesive with Different Air Permeability at 170℃ in Example 2 Table 5: Results of Curing Rate Measurement of Cigarette Paper Sealing Adhesive with Different Combustion Improver Contents at 170℃ in Example 3 Table 6: Results of Curing Rate Measurement of Cigarette Paper Edge Adhesive with Different Potassium-Sodium Ratios at 170℃ in Example 4 Table 7: Results of Curing Rate Measurement of Cigarette Paper Sealing Adhesive with Different Calcium Carbonate Content at 170℃ in Example 5 Table 8: Results of Curing Rate Measurement of Cigarette Paper Sealing Adhesive with Different Hemp Content in Example 6 at 170℃ Table 3 shows the curing rate data of the adhesive sealant on cigarette paper at 170℃. For cigarette papers #1, #2, #0, #3, and #4, when the curing time of the adhesive sealant is >150s, the curing rate of each cigarette paper exceeds 80%. When the curing time is ≤150s, at the same curing time, cigarette paper #1 has the highest curing rate, and cigarette paper #3 has the lowest. Cigarette paper #1 has an adhesive sealant curing rate exceeding 80% at 60s, cigarette papers #2, #0, and #4 have curing rates above 80% at 90s, and cigarette paper #3 has a curing rate above 80% at 150s. Therefore, cigarette paper #1, i.e., the basis weight of the cigarette paper, is 26.5 g / m³. 2When the curing time of the adhesive is greater than 180 seconds, the curing time of the sealing tape is the shortest, with a minimum curing time of 60 seconds. Table 4 shows that for cigarette papers #5, #0, and #6, when the curing time of the sealing tape is greater than 180 seconds, the curing rate remains stable at a high level. When the curing time is less than or equal to 180 seconds, the curing rate decreases significantly in the order of #5 → #0 → #6. At the same curing time, #5 cigarette paper has the highest curing rate, while #6 cigarette paper has the lowest. The curing rate of #5 cigarette paper reaches over 80% at 60 seconds, while the curing rates of #0 and #6 cigarette paper exceed 80% at 90 seconds. Therefore, for #5 cigarette paper, i.e., when the air permeability of the cigarette paper is 49.6 CU, the curing time of the sealing tape is the shortest, with a minimum curing time of 60 seconds. Table 5 shows that for cigarette papers #12, #11, #0, #10, and #9, when the curing time is greater than 150 seconds, the curing rate is close to 100% and shows no significant fluctuation. When the curing time is ≤150s, the curing rate shows a fluctuating upward trend in the order of 12#→11#→0#→10#→9#. At the same curing time, 0# cigarette paper has the highest curing rate, while 10# cigarette paper has the lowest. 0# cigarette paper has a curing rate of 90s, while 12#, 11#, 10#, and 9# cigarette papers have curing rates above 80% at 150s. Therefore, 0# cigarette paper, i.e., when the combustion aid content is 3.05%, has the shortest curing time for the adhesive, with a minimum time of 90s. Table 6 shows that for 13#, 14#, 15#, and 0# cigarette papers, when the curing time is >180s, the curing rate is close to 100% and shows no significant fluctuation. When the curing time is ≤180s, the curing rate shows a fluctuating upward trend from 13# to 14# to 15# to 0#. At the same curing time, 0# cigarette paper has the highest curing rate, while 15# cigarette paper has the lowest. For 13# and 14# cigarette papers, the adhesive curing rate is above 80% after 150s; for 15# cigarette paper, it reaches above 80% after 180s; and for 0# cigarette paper, it is above 80% after 90s. Therefore, for 0# cigarette paper, i.e., when the potassium-to-sodium ratio is 7:1, the adhesive curing time is the shortest, at 90s. Table 7 shows that for 7#, 0#, and 8# cigarette papers, when the curing time is >150s, the adhesive curing rate remains close to 100%, and the difference in curing rate between different cigarette papers is minimal. When the curing time is ≤150s, the curing rate shows a trend of first increasing and then decreasing in the order of 7#→0#→8#. At the same curing time, 0# cigarette paper has the highest curing rate, while the curing rates of 7# and 8# cigarette papers are not significantly different. The curing rates of 7# and 8# cigarette papers reach over 80% at 150s, while the curing rate of 0# cigarette paper is over 80% at 90s. Therefore, for 0# cigarette paper (i.e., when the calcium carbonate content is 31.4%), the adhesive curing time is the shortest, with a minimum time of 90s. Table 8 shows that for 0# and 16# cigarette papers, when the curing time is >150s, the adhesive curing rate is close to 100%.When the curing time is ≤150s, the curing rate decreases in the order from 0# to 16#. At the same curing time, 0# cigarette paper has the highest curing rate, while 16# cigarette paper has the lowest. 0# cigarette paper achieves a curing rate of over 80% after 90s, while 16# cigarette paper achieves a curing rate of over 80% for the adhesive at 150s. Therefore, 0# cigarette paper, i.e., with a hemp content of 10%, has the shortest adhesive curing time. Through systematic analysis of all examples (Tables 3 to 8), the basis weight of the cigarette paper is 26.5 g / m³ at a curing time of 170℃. 2 Under the conditions of air permeability of 49.6 CU, combustion aid content of 3.05%, potassium-sodium ratio of 7:1, calcium carbonate content of 31.4%, and hemp content of 10%, the curing time of cigarette paper edge adhesive can be shortened.

[0027] The above content fully demonstrates that the method provided by the present invention can accurately and efficiently determine the curing rate of cigarette paper sealant and the minimum curing time of cigarette paper sealant, providing technical support for optimizing cigarette production processes, improving cigarette product quality, and extending the service life of cigarette machine soldering irons.

[0028] The applicant declares that this invention illustrates the method for determining the curing rate of cigarette paper adhesive and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the product, additions of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of this invention.

[0029] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0030] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A method for determining the curing rate of the adhesive on cigarette paper, characterized in that, The method for determining the curing rate of the cigarette paper adhesive includes the following steps: The cigarette paper sample was dried until its weight was constant, and then weighed and recorded as m. Apply adhesive to the cigarette paper sample, then weigh it and record the weight as M; The cigarette paper sample coated with adhesive was dried and then weighed and recorded as Mn. The mass loss rate W and the curing rate Q are calculated based on the weighing results, using the following formulas: ； ； In the formula, P is the solid content of the adhesive tape.

2. The method for determining the curing rate of the cigarette paper adhesive according to claim 1, characterized in that, The drying temperature for each drying cycle is independently set at 90-210℃.

3. The method for determining the curing rate of the cigarette paper adhesive according to claim 1 or 2, characterized in that, Each weighing should be performed at least twice, and the average value should be taken as the final weight. Multiple weighings should be used to confirm that the weight is constant, and the weight difference between two adjacent weighings should not exceed 0.5 mg.

4. The application of the method for determining the curing rate of cigarette paper adhesive according to any one of claims 1-3 in determining the shortest curing time of cigarette paper adhesive.

5. A method for determining the shortest curing time of cigarette paper adhesive, characterized in that, The method for determining the minimum curing time of the cigarette paper adhesive includes the following steps: Several cigarette paper samples were dried to a constant weight and then coated with a sealing adhesive. The samples were dried for different times. The curing rate of the sealing adhesive in the cigarette paper samples dried for different times was measured according to the method for determining the curing rate of the sealing adhesive in any one of claims 1-3. The drying time corresponding to when the sealing adhesive was completely cured was determined based on the measurement results. This drying time was the shortest curing time.

6. The method for determining the shortest curing time of the cigarette paper adhesive according to claim 5, characterized in that, The drying time range for the different drying times is 30-600 s.

7. The method for determining the shortest curing time of the cigarette paper adhesive according to claim 5 or 6, characterized in that, The drying temperature is 90-210℃.

8. The method for determining the shortest curing time of the cigarette paper adhesive according to any one of claims 5-7, characterized in that, When the curing rate reaches 80% or higher, the joint adhesive is considered to be fully cured.

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