Modified box sealing adhesive tape for keeping moisture content of tobacco strip box and use method

Abstract

The invention relates to the technical field of tobacco leaf storage and maintenance, and particularly discloses a modified box sealing adhesive tape for keeping the moisture content of a strip tobacco box and a use method. A natural organic polymer material (chitosan and sodium alginate) or a synthetic organic polymer material (polyacrylamide and polyacrylate) is used as a main body, and after the water content is regulated and controlled by 40-60 wt%, a slow-release functional belt with the thickness of 0.5-1.0 cm is formed in the center of the width direction of a common box sealing adhesive tape. The modified adhesive tape is used for sealing a structural gap between an upper rocking cover and a box body of a tobacco box, a stable microenvironment with the relative humidity of 55%-65% can be constructed in the box, and the moisture content of tobacco strips is kept within the process standard range of 11%-13% for a long time. Traditional high-energy-consumption environment regulation and control equipment is abandoned, water self-balance is achieved through material modification, and the method has the remarkable advantages that the operation efficiency is improved, and the unit storage energy consumption is reduced and is suitable for large-scale industrial application.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco leaf storage and maintenance, and in particular, to a modified sealing tape and a method for maintaining the moisture content in a cut tobacco box using the modified sealing tape. Background Art

[0002] In the tobacco processing field, the cut tobacco raw materials after the threshing and redrying process need to meet the moisture content standard of 11%-13%. This parameter range has been proven to ensure the storage safety and aging quality of cut tobacco to the greatest extent during long-term storage. However, after the cut tobacco raw materials are redried and packed into boxes, they need to go through an aging cycle of 1-3 years. During this period, due to the moisture absorption and desorption caused by the fluctuations of temperature and humidity in the storage environment, the moisture content of cut tobacco shows significant seasonal fluctuations. Experimental data shows that in summer with high temperature and high humidity (relative humidity > 75%), the moisture content of the cut tobacco on the surface layer of the tobacco box can rise above 13%, while in winter with low temperature and low humidity (relative humidity < 45%), it will drop below 11%. Such moisture content fluctuations will not only cause the risk of tobacco leaf mildew, but also increase the difficulty of moisture content balance control in the silk reeling process, resulting in a decrease in the yield of cigarette finished products.

[0003] In the prior art, the industry generally uses the environmental control method for moisture content intervention. For example, the moisture regulation control cabinet for primary-cured tobacco leaves disclosed in Chinese Patent CN205143469U realizes the dehumidification treatment by constructing a closed circulation air system in cooperation with a temperature and humidity regulation device; Chinese Patent CN118716673A improves the moisture content of cigar wrapper tobacco leaves through the atomized steam humidification technology. Although such methods can achieve rapid moisture regulation, they have the following technical defects: (1) special temperature and humidity regulation equipment needs to be configured, increasing the equipment investment cost; (2) the energy consumption intensity for maintaining constant environmental parameters is high, and the annual operation cost increases significantly; (3) the regulation effect is limited to the internal space of the equipment and it is difficult to adapt to large-scale storage scenarios.

[0004] The traditional tobacco box sealing and packing process has structural defects: there are three linear gaps with an average width of 2.3 mm in the form of one vertical and two horizontal at the joint of the upper swing cover and the box body, resulting in an increased humidity exchange rate between the inside and outside of the box. The penetration effect makes the moisture content of cut tobacco form a strong coupling relationship with the external environment, which is the fundamental reason for the inefficiency of traditional regulation methods. Summary of the Invention

[0005] To solve the problem that the moisture content of cut tobacco fluctuates due to seasonal influence during storage and aging, the present invention provides a modified sealing tape for maintaining the moisture content of a cut tobacco box and a usage method, aiming to construct a closed microenvironment system through the sealing tape, reduce the environmental penetration rate, and achieve self-balancing of the humidity inside the box.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention first discloses a modified sealing tape for maintaining the moisture content of a sheet cigarette box. The tape consists of two parts:

[0008] 1. Base material layer: Use a conventional sealing tape base material with a pressure-sensitive adhesive layer, and you can choose one from BOPP tape, cloth-based tape, kraft paper tape or masking tape. The base material layer has two major functions: one is to be able to adhere closely to the sheet cigarette box; the other is to effectively isolate the humidity environment inside and outside the cigarette box.

[0009] 2. Sustained-release functional layer: The chemical composition includes natural organic polymer materials such as chitosan and / or sodium alginate, or synthetic organic polymer materials such as polyacrylamide and / or polyacrylate. This polymer sustained-release agent can slowly release water in a low-humidity environment and slowly absorb water in a high-humidity environment, thereby achieving stable regulation of the ambient humidity. Before use, the polymer sustained-release agent needs to be pre-treated. The specific steps are to soak it in deionized water to absorb water, and then dry it in the shade to control the moisture content at 40-60wt%. Under this moisture content condition, the modified sealing tape can create a relative humidity of 55%-65% inside the cigarette box, thereby maintaining the moisture content of the tobacco leaves within the range of 11%-13%. The sustained-release functional layer is arranged on the bonding surface of the substrate layer, is continuously arranged along the length direction of the substrate layer, and is located in the central area of ​​the width direction of the substrate layer. The width of the sustained-release functional layer is configured to be 0.5-1.0cm, and the overlap deviation between its width centerline and the width centerline of the substrate layer does not exceed ±0.1cm, ensuring that the gap formed after the cigarette box is packaged can be completely covered during use.

[0010] The preparation process of the modified packing tape is as follows: a vibrating screen is installed on an ordinary packing tape rewinder, and the screen of the vibrating screen is located on the base tape (i.e., the base layer of the modified packing tape) between the rewinder mandrel and the base tape roll; the polymer sustained-release agent that has been treated with water absorption is spread on the screen of the vibrating screen, and the relative positions of the vibrating screen and the rewinder are adjusted so that the center line of the width of the screen area of ​​the vibrating screen should coincide with the center line of the width of the base tape between the mandrel and the base tape roll. The width of the screen area should be the same as the width configuration of the required sustained-release functional layer, and the mesh number of the screen area is 10-40 meshes. The rewinder and the vibrating screen are turned on at the same time. Due to the vibration effect, the polymer sustained-release agent on the screen will evenly fall on the base tape between the mandrel and the base tape roll, and adhere to the pressure-sensitive adhesive layer of the base tape to form a sustained-release functional layer, thereby obtaining a modified packing tape. During the preparation process, the vibration frequency of the vibrating screen and the rewinding speed of the rewinding machine are adjusted to ensure that the natural shedding amount of the polymer sustained-release agent is in the range of 0.001g / cm tape-0.020g / cm tape.

[0011] The present invention also discloses a specific method for using the modified sealing tape to maintain the moisture content of cut tobacco in a tobacco case: The modified sealing tape is applied along the sealing gap direction of the tobacco case to ensure that the slow-release functional layer completely coincides with the three types of gaps formed after the cut tobacco is packed into the case, that is, the modified sealing tape is completely adhered to the three gaps formed after the tobacco case is packed. These three gaps are respectively the longitudinal gap formed by the butt joint of the upper swing lids of two tobacco cases, and the two transverse gaps formed by the front and rear side walls of the upper swing lid of the tobacco case and the main body of the tobacco case. During the sealing process, special attention should be paid to accurately aligning the central position of the tape width with the gap to ensure that the slow-release functional layer can completely cover the tobacco case gap.

[0012] After the sealing operation is completed, the cut tobacco can be stored in the warehouse according to the normal process and maintained according to the industry's common maintenance methods.

[0013] The beneficial effects of the present invention are reflected in:

[0014] 1. The modified sealing tape of the present invention is based on natural organic polymer materials (chitosan, sodium alginate) or synthetic organic polymer materials (polyacrylamide, polyacrylate), and after the moisture content is regulated to 40-60 wt%, a 0.5-1.0 cm slow-release functional band is formed in the center of the width direction of the ordinary sealing tape. The modified sealing tape of the present invention has achieved the following technical improvements: (1) reducing the environmental permeability by using a multi-layer composite barrier material; (2) integrating a moisture slow-release material to achieve self-balancing of the humidity inside the case; (3) eliminating the external energy supply system and reducing the unit storage energy consumption.

[0015] 2. By sealing the structural gap between the upper swing lid of the tobacco case and the box body with the modified sealing tape of the present invention, a stable microenvironment with a relative humidity of 55%-65% can be constructed inside the case, so that the moisture content of the cut tobacco can be maintained in the process standard range of 11%-13% for a long time. Compared with the prior art, the solution of the present invention abandons the traditional high-energy-consuming environment control equipment on the premise of ensuring the process requirements, and realizes moisture self-balancing through material modification. It has the significant advantages of simple and easy operation, improved operation efficiency, and reduced unit storage energy consumption. It can efficiently and low-costly solve the moisture fluctuation problem in the storage and aging process of cut tobacco, is suitable for large-scale industrial application, and significantly improves the technical economy and environmental friendliness. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the modified sealing tape described in the present invention;

[0017] Figure 2 It is a schematic diagram of the usage method of the modified sealing tape for maintaining the moisture of the tobacco case described in the present invention;

[0018] Figure 3 It is a schematic diagram of the preparation method of the modified sealing tape described in the present invention;

[0019] Reference numerals in the figure: 1 - substrate layer; 2 - slow-release functional layer; 3 - main body of the cigarette box; 4 - upper swing cover of the cigarette box; 5 - rewinder; 6 - mandrel; 7 - substrate tape roll; 8 - water-absorbed polymer slow-release agent; 9 - screen; 10 - vibrating screen. Detailed implementation mode

[0020] The present invention will be specifically described below through embodiments. It is necessary to point out here that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the above content of the present invention, which still belong to the protection scope of the present invention.

[0021] Embodiment 1 - Implementation application of modified sealing tape in the moisture-proof process of tobacco leaves in high-temperature and high-humidity seasons in summer

[0022] As Figure 1 shown, the modified sealing tape used in this embodiment includes: a substrate layer, and BOPP tape is selected; a slow-release functional layer, and chitosan treated by water absorption is selected as the polymer slow-release agent.

[0023] The preparation method of the modified sealing tape used in this embodiment is: soak chitosan in deionized water for water absorption and then air-dry it, and control the water content to be 40 wt%. As Figure 3 shown, a vibrating screen 10 is installed on the sealing tape rewinder 5, and the screen 9 of the vibrating screen 10 is located on the substrate tape between the mandrel 6 of the rewinder and the substrate tape roll 7; the water-absorbed polymer slow-release agent 8 is laid flat on the screen 9, the width of the screen area is 0.8 cm, and the mesh number of the screen area is 20 meshes. Adjust the relative positions of the vibrating screen 10 and the rewinder 5 so that the width center line of the screen 9 coincides with the width center line of the substrate tape between the mandrel 6 and the substrate tape roll 7; at the same time, start the rewinder 5 and the vibrating screen 10, so that the polymer slow-release agent evenly falls on the substrate tape between the mandrel and the substrate tape roll and adheres to the pressure-sensitive adhesive layer of the substrate tape to form a slow-release functional layer, and a modified sealing tape is obtained. During the preparation process, adjust the vibration frequency of the vibrating screen and the rewinding speed of the rewinder so that the natural shedding amount of the polymer slow-release agent is 0.013 g / cm of the tape. The width of the slow-release functional layer of the finally prepared modified sealing tape is 0.82 ± 0.03 cm.

[0024] The grade of the sealed tobacco leaves is C3FA in southern Anhui in 2023, the initial moisture content of the tobacco leaves is 11.5%, and the sealing date is May 12, 2024. The modified sealing tape (or a common BOPP tape without a slow-release functional layer for comparison) is applied along the sealing gap direction of the cigarette box to ensure that the slow-release functional layer completely coincides with the three types of gaps formed after the tobacco leaves are packed in the box.

[0025] On October 13, 2024, the sealed boxes were unsealed and the moisture contents of the upper, middle, and lower layers of tobacco leaves in the boxes were monitored. Compared with the control tobacco boxes without sealing tape, the results are as follows:

[0026] Table 1

[0027]

[0028] It can be seen from the comparison that the increase in moisture content of the upper and middle layers of tobacco leaves treated with the modified tape is significantly reduced, and the overall moisture content of the tobacco box is within the standard range. The modified tape can achieve a good moisture-proof effect for cut tobacco in summer.

[0029] Example 2 - Implementation and application of the modified sealing tape in the process of maintaining the moisture of tobacco leaves in the low-temperature and low-humidity season in winter

[0030] As Figure 1 shown, the modified sealing tape used in this example includes: a base material layer, and kraft paper tape is selected; a slow-release functional layer, and polyacrylamide is selected as the polymer slow-release agent.

[0031] The preparation method of the modified sealing tape used in this example is as follows: Polyacrylamide is soaked in deionized water to absorb water and then dried in the shade, and the water content is controlled to be 55 wt%. As Figure 3 shown, a vibrating sieve 10 is installed on the sealing tape rewinder 5, and the sieve mesh 9 of the vibrating sieve 10 is located on the base material tape between the mandrel 6 of the rewinder and the base material tape roll 7; the water-absorbed polymer slow-release agent 8 is laid flat on the sieve mesh 9, the width of the sieve mesh area is 1.0 cm, and the mesh number of the sieve mesh area is 10 meshes. Adjust the relative positions of the vibrating sieve 10 and the rewinder 5 so that the width center line of the sieve mesh 9 coincides with the width center line of the base material tape between the mandrel 6 and the base material tape roll 7; at the same time, start the rewinder 5 and the vibrating sieve 10, so that the polymer slow-release agent evenly falls on the base material tape between the mandrel and the base material tape roll and adheres to the pressure-sensitive adhesive layer of the base material tape, forming a slow-release functional layer to obtain the modified sealing tape. During the preparation process, adjust the vibration frequency of the vibrating sieve and the rewinding speed of the rewinder so that the natural shedding amount of the polymer slow-release agent is 0.009 g / cm tape. The width of the slow-release functional layer of the finally prepared modified sealing tape is 1.04 ± 0.05 cm.

[0032] The grade of the sealed tobacco leaves is C2FA from Liangshan, Sichuan in 2022, the initial moisture content of the cut tobacco leaves is 11.2%, and the sealing date is November 1, 2023. The modified sealing tape (or the ordinary kraft paper tape without a slow-release functional layer for comparison) is applied along the sealing gap direction of the tobacco box to ensure that the slow-release functional layer completely coincides with the three types of gaps formed after the cut tobacco is packed.

[0033] On March 25, 2024, the sealed boxes were unsealed and the moisture contents of the upper, middle, and lower layers of tobacco leaves in the boxes were monitored. Compared with the control tobacco boxes without sealing tape, the results are as follows:

[0034] Table 2

[0035]

[0036]

[0037] By comparison, it can be seen that the moisture loss of the upper and middle layers of the tobacco leaves sealed with the modified sealing tape is significantly reduced, and the overall moisture content of the sealed tobacco leaves is within the appropriate range. Using the modified sealing tape for sealing can significantly alleviate the problem of moisture loss of the tobacco leaves stored in the warehouse in winter.

[0038] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modified sealing tape for maintaining the moisture content of a sheet cigarette box, characterized in that: The invention comprises a substrate layer (1) and a slow-release functional layer (2) arranged on the bonding surface of the substrate layer; the substrate layer (1) is a conventional sealing tape with a pressure-sensitive adhesive layer, and the slow-release functional layer (2) is composed of a polymer slow-release agent that has been subjected to water absorption treatment, and is continuously arranged along the length direction of the substrate layer and located in the central area of ​​the width direction of the substrate layer.

2. The modified sealing tape according to claim 1, characterized in that: The substrate layer (1) is selected from any one of BOPP tape, cloth-based tape, kraft paper tape or masking tape.

3. The modified sealing tape according to claim 1, characterized in that: The polymer sustained-release agent is selected from natural organic polymer materials or synthetic organic polymer materials, wherein: the natural organic polymer material includes at least one of chitosan and sodium alginate; the synthetic organic polymer material includes at least one of polyacrylamide and polyacrylate.

4. The modified sealing tape according to claim 1, characterized in that: The polymer sustained-release agent subjected to water absorption treatment is prepared by soaking the polymer sustained-release agent in deionized water to absorb water and then drying it in the shade, and the water content is controlled to be 40-60wt%.

5. The modified sealing tape according to claim 1, characterized in that: The width of the sustained-release functional layer (2) is configured to be 0.5-1.0 cm, and the deviation of the overlap between the width center line of the sustained-release functional layer (2) and the width center line of the substrate layer (1) does not exceed ±0.1 cm.

6. A method for preparing the modified sealing tape according to any one of claims 1 to 5, characterized in that: A vibrating screen (10) is installed on a sealing tape rewinder (5), wherein a screen (9) of the vibrating screen (10) is located on the base tape between a core shaft (6) of the rewinder and a base tape roll (7); a polymer sustained-release agent (8) that has been subjected to water absorption treatment is spread on the screen (9), and the relative positions of the vibrating screen (10) and the rewinder (5) are adjusted so that the width center line of the screen (9) coincides with the width center line of the base tape between the core shaft (6) and the base tape roll (7); The rewinder (5) and the vibrating screen (10) are turned on at the same time, and the polymer sustained-release agent on the screen (9) falls evenly onto the base tape due to the vibration and adheres to the pressure-sensitive adhesive layer of the base tape to form a sustained-release functional layer, thereby obtaining a modified sealing tape.

7. The method for preparing the modified sealing tape according to claim 6, characterized in that: The width of the screen (9) is configured to be the same as the required width of the sustained-release functional layer, and the mesh number of the screen is 10-40 meshes.

8. The method for preparing the modified sealing tape according to claim 6, characterized in that: During the preparation process, the vibration frequency of the vibrating screen (10) and the rewinding speed of the rewinding machine (5) are adjusted to ensure that the natural shedding amount of the polymer sustained-release agent is within the range of 0.001 g / cm tape-0.020 g / cm tape.

9. A method for using the modified sealing tape according to any one of claims 1 to 5, characterized in that: The modified sealing tape is applied along the sealing gap of the cigarette box to ensure that the sustained-release functional layer (2) completely overlaps with the following three types of gaps formed after the cigarette pieces are packed: a) A longitudinal gap formed by the butt joint of two upper swing covers (4) of the cigarette box; b) a transverse gap formed between the upper swing cover (4) of the cigarette box and the front side wall of the cigarette box body (3); c) A transverse gap formed between the upper swing cover (4) of the cigarette box and the rear side wall of the cigarette box body (3).

10. The method of use according to claim 9, characterized in that: During application, the tape positioning device is used to ensure that the ratio of the width coverage of the sustained-release functional layer (2) to the width of the sealing gap is 1.2-1.5:1.

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