High-moisture-absorption lining paper for cigarette packaging

Abstract

The invention discloses packaging high-moisture-absorption lining paper for cigarettes. The lining paper sequentially comprises an outer anti-friction layer, a three-dimensional partition moisture absorption layer and an inner attaching layer from outside to inside. Wherein the three-dimensional partitioned moisture absorption layer is divided into a high-density moisture absorption area corresponding to a tobacco shred end, a middle-density moisture absorption area corresponding to a filter tip end and an edge buffer area surrounding the high-density moisture absorption area and the middle-density moisture absorption area in the length direction of the cigarette, and the high-density moisture absorption area, the middle-density moisture absorption area and the edge buffer area are filled with microencapsulated moisture absorption agents with different densities respectively; the outer anti-friction layer is provided with a transparent window and a built-in gradient allochroic silica gel strip, the inner attaching layer is provided with an epoxy sealing strip, and the edge of the lining paper is provided with a tearable cutting edge. The moisture content of the cigarettes can be stably maintained to be 12-14%, the content of volatile organic compounds is smaller than or equal to 0.1 mg / kg, the number of times of friction resistance is larger than or equal to 50, the method is matched with a cigarette baking box and a fine cigarette box, moisture absorption state visualization and convenient disassembly and assembly are achieved, and the storage quality and the smoking taste of the cigarettes are effectively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of cigarette inner lining paper, specifically, it relates to a highly moisture-absorbing inner lining paper for cigarette packaging. Background Technology

[0002] The moisture content of cigarettes is a core indicator affecting tobacco quality: when the moisture content is below 12%, the tobacco is prone to brittleness, and the burning speed is too fast, resulting in a spicy taste; when it is above 14%, the tobacco is prone to mold, and "flameout" and "explosion" phenomena are likely to occur after ignition. Although moisture-absorbing inner lining paper for cigarettes has appeared in the industry, market research and technical analysis have revealed the following undeniable technical defects in existing products.

[0003] For example, most existing cigarettes on the market use a single-density moisture-absorbing layer design, with the desiccant evenly distributed throughout the inner liner paper. However, in actual cigarette structures, the tobacco end (accounting for 70% of the cigarette length) needs continuous moisture control to prevent mold growth, while the filter end (accounting for 30%) is made of cellulose acetate. Excessive moisture absorption can lead to filter softening and decreased filtration efficiency (experimental data shows that when the filter moisture content increases from 12% to 16%, tar filtration efficiency decreases by 15-20%). Traditional single-layer designs cannot meet these differentiated needs, resulting in the coexistence of the contradiction of "tobacco too dry / filter too damp". In addition, traditional inner liner paper is fixed to the inner wall of the cigarette box with glue, requiring tools to peel it off when replacing it, which can easily damage the cigarette box, and residual glue can contaminate the new inner liner paper.

[0004] Therefore, in order to address the aforementioned shortcomings of the existing technology, it is necessary to design a moisture-proof feature for the inner lining paper of cigarettes. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a highly absorbent liner paper for cigarette packaging, which avoids the problems of the previous cigarette liner paper having a single layer and weak moisture resistance.

[0006] To address the aforementioned technical problems, this invention discloses a highly absorbent moisture-absorbing inner lining paper for cigarette packaging, comprising: The outer anti-friction layer, the three-dimensional partitioned moisture-absorbing layer, and the inner bonding layer are arranged sequentially from the outside to the inside; the outer anti-friction layer is food-grade breathable cotton paper that conforms to GB4806.8 standard, and its surface is treated with a micro-coating. The three-dimensional zoned moisture absorption layer comprises three functional zones along the length of the cigarette: a high-density moisture absorption zone corresponding to the tobacco end, a medium-density moisture absorption zone corresponding to the filter end, and an edge buffer zone surrounding the high-density and medium-density moisture absorption zones. The high-density moisture absorption zone accounts for 40% of the total area of ​​the three-dimensional zoned moisture absorption layer, the medium-density moisture absorption zone accounts for 35% of the total area of ​​the three-dimensional zoned moisture absorption layer, and the edge buffer zone accounts for 25% of the total area of ​​the three-dimensional zoned moisture absorption layer. The high-density moisture-absorbing zone is filled with a density of 0.12 g / cm³. 2The microencapsulated desiccant has a medium-dense moisture-absorbing zone filled with a density of 0.08 g / cm³. 2 The microencapsulated desiccant has a 0.5mm thick food-grade sponge built into the edge buffer zone; The inner bonding layer is a food-grade breathable cotton paper with pre-pressed positioning texture, and the curvature of the pre-pressed positioning texture matches the curvature of the inner wall of the cigarette box. The outer anti-friction layer and the inner bonding layer are connected by peripheral heat sealing and central dot bonding, with a 0.1mm air gap reserved between them.

[0007] Furthermore, the microencapsulated desiccant consists of a core material and a wall material; the core material is a mixture of calcium chloride and tobacco-grade montmorillonite in a mass ratio of 7:5, and the wall material is food-grade hydroxypropyl methylcellulose (HPMC); the microcapsules have a particle size of 100-200 μm and a microencapsulation coverage rate of ≥98%.

[0008] Furthermore, it also includes a detachable connection structure; the connection structure is a food-grade self-adhesive epoxy sealant set on both sides of the inner bonding layer, the epoxy sealant being used to detachably attach the inner lining paper to the inner wall of the cigarette box.

[0009] Furthermore, the overall dimensions of the inner lining paper are adapted to the specifications of cigarette packaging: 84mm×55mm when adapted to a flue-cured tobacco box, and 97mm×48mm when adapted to a slim cigarette box; and the edge of the inner lining paper has a tearable edge with a width of 0.5cm, and the surface of the tearable edge is printed with scale lines.

[0010] Furthermore, the outer anti-friction layer has a 1cm×3cm transparent window at the edge of the high-density moisture-absorbing zone, with a gradient color-changing silicone strip inside the transparent window. The color-changing range of the gradient color-changing silicone strip is: light blue when the moisture absorption is 0g, light purple when the moisture absorption is 7.5g, and light pink when the moisture absorption is 15g. The transparent window surface is marked with the following markings: light purple requires attention, light pink requires replacement.

[0011] Furthermore, both the outer anti-friction layer and the inner bonding layer undergo low-temperature deodorization treatment: the low-temperature deodorization treatment includes soaking the cotton paper in deionized water at 60°C for 10 minutes and then drying it at a constant temperature of 45°C; the microencapsulated desiccant is deodorized by being vacuum-treated at 30°C for 2 hours; the volatile organic compound (VOC) content of the inner lining paper after treatment is ≤0.1mg / kg.

[0012] Furthermore, the outer anti-friction layer surface is embossed with contour lines corresponding to the functional areas of the three-dimensional partitioned moisture-absorbing layer, and each contour line is printed with a desiccant filling amount scale; the microencapsulated desiccant is provided in dose-specific packaging, with the high-density moisture-absorbing zone dose being 6g / packet and the medium-density moisture-absorbing zone dose being 5g / packet.

[0013] Furthermore, a self-adhesive heat-sealing strip is provided at the periphery of the heat-sealing area between the outer anti-friction layer and the inner bonding layer; the self-adhesive heat-sealing strip includes food-grade heat-sealing adhesive coated on the edge of the outer anti-friction layer and release paper covering the surface of the heat-sealing adhesive, and the self-adhesive heat-sealing strip can be sealed by manually pressing.

[0014] Furthermore, the overall thickness of the inner lining paper is ≤0.5mm, and after the cigarette box opening and closing test, its abrasion resistance is ≥50 times, and the powder leakage rate of DIY packaging is ≤0.5%.

[0015] Furthermore, the microencapsulated desiccant also contains food-grade activated alumina, which accounts for 20% of the total mass of the core material; the inner liner paper is used to maintain the moisture content of the cigarette in the range of 12-14%, with a moisture content fluctuation error of ≤±0.8%.

[0016] Compared with the prior art, the present invention can achieve the following technical effects: This invention uses a differentiated design of a three-dimensional partitioned moisture-absorbing layer, with a high-density zone corresponding to the tobacco end and a medium-density zone corresponding to the filter end, to precisely match the moisture absorption needs of different parts of the cigarette, preventing the tobacco from becoming moldy or the filter from softening, ensuring that the moisture content of the cigarette is stable in the range of 12-14%, with a fluctuation error of ≤±0.8%, and significantly improving the smoking experience. The microencapsulated desiccant is coated with food-grade HPMC wall material with a coverage rate of ≥98%, effectively preventing desiccant leakage. At the same time, each layer of material is deodorized at low temperature, and the microencapsulated desiccant is deodorized under vacuum, with a final VOCs content of ≤0.1mg / kg, no odor release, avoiding cross-contamination with cigarette flavor, and meeting food-grade safety requirements. By combining a transparent window with a gradient color-changing silicone strip, users can intuitively judge the degree of moisture absorption, avoiding waste caused by replacing it too early or moisture absorption failure caused by replacing it too late, thus reducing usage costs. It supports multiple sizes of cigarette boxes, including those for cigarettes and slim cigarettes, and features tearable edges for easy size adjustments. The detachable epoxy sealant and self-adhesive heat-sealing strip design allows for quick installation and replacement without additional tools, enhancing usability.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic cross-sectional view of the layered structure of the highly absorbent hygroscopic inner lining paper for cigarette packaging according to an embodiment of the present invention; Figure 2This is a schematic diagram of the three-dimensional partitioned moisture-absorbing layer according to an embodiment of the present invention; Figure 3 This is a planar schematic diagram of the outer anti-friction layer according to an embodiment of the present invention. Attached Figure Labels

[0019] Outer anti-friction layer 1, three-dimensional partitioned moisture-absorbing layer 2, inner bonding layer 3, transparent window 11, gradient color-changing silicone strip 12, high-density moisture-absorbing zone 21, medium-density moisture-absorbing zone 22, edge buffer zone 23, self-adhesive epoxy sealant 31. Detailed Implementation

[0020] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings and embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Please refer to Figures 1 to 3 , Figure 1 This is a schematic cross-sectional view of the layered structure of the highly absorbent hygroscopic inner lining paper for cigarette packaging according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional partitioned moisture-absorbing layer according to an embodiment of the present invention; Figure 3 This is a planar schematic diagram of the outer anti-friction layer according to an embodiment of the present invention.

[0022] As shown in the figure, a highly absorbent liner paper for cigarette packaging has a core structure consisting of an outer anti-friction layer 1, a three-dimensional partitioned moisture-absorbing layer 2, and an inner bonding layer 3, from the outside to the inside. The layers work together to achieve precise moisture absorption, safety, stability, and convenient use.

[0023] Specifically, the outer anti-friction layer 1 is made of food-grade breathable cotton paper that conforms to GB4806.8 standard, and the surface is treated with a micro-coating to improve the friction resistance. At the same time, the outer anti-friction layer 1 is treated with low-temperature deodorization: the cotton paper is soaked in deionized water at 60℃ for 10 minutes and then dried at a constant temperature of 45℃ to remove odors and reduce VOCs content.

[0024] The three-dimensional partitioned moisture-absorbing layer 2 is the core moisture-absorbing structure of the inner lining paper. It is divided into three functional zones along the length of the cigarette to meet the moisture absorption needs of different parts of the cigarette.

[0025] Among them, the high-density moisture-absorbing zone 21 corresponds to the tobacco end, accounting for 40% of the total area of ​​the three-dimensional partitioned moisture-absorbing layer 2, with a filling density of 0.12 g / cm³. 2 The microencapsulated desiccant provides high moisture absorption capacity to prevent tobacco from becoming moldy. The medium-density moisture-absorbing zone 22 corresponds to the filter tip end, accounting for 35% of the total area of ​​the three-dimensional zoned moisture-absorbing layer 2, with a filling density of 0.08 g / cm³. 2The microencapsulated desiccant absorbs moisture appropriately to prevent the filter from softening. The edge buffer zone 23 surrounds the high-density desiccant zone 21 and the medium-density desiccant zone 22, accounting for 25% of the total area of ​​the three-dimensional partitioned desiccant layer 2. It contains a 0.5mm thick food-grade sponge to provide cushioning and protection, preventing the desiccant from leaking due to pressure when the cigarette box is opened and closed.

[0026] The inner bonding layer 3 of the present invention is made of food-grade breathable cotton paper with pre-pressed positioning texture. The curvature of the pre-pressed positioning texture is adapted to the curvature of the inner wall of the cigarette box to ensure that the inner lining paper is tightly bonded to the inner wall of the cigarette box. The inner bonding layer 3 is also subjected to the above-mentioned low-temperature deodorization treatment to ensure that there is no odor.

[0027] Furthermore, the microencapsulated desiccant is a safe and efficient core moisture-absorbing component, composed of a core material and a wall material. The core material is a mixture of calcium chloride and tobacco-grade montmorillonite in a 7:5 mass ratio, mixed with 20% food-grade activated alumina by mass to enhance moisture absorption stability and odor adsorption capacity. The wall material is food-grade hydroxypropyl methylcellulose (HPMC) to ensure biocompatibility. Preferably, the microcapsule particle size is 100-200 μm, with a microencapsulation coverage rate ≥98%, effectively preventing core material leakage. The microencapsulated desiccant undergoes a deodorization treatment by being vacuum-set at 30°C for 2 hours to further reduce odor release.

[0028] The inner bonding layer 3 has food-grade self-adhesive epoxy sealant on both sides, allowing the inner liner paper to be detachably attached to the inner wall of the cigarette box for easy periodic replacement and improved usability. The overall size of the inner liner paper is adapted to cigarette packaging specifications, measuring 84mm × 55mm when used with flue-cured tobacco boxes and 97mm × 48mm when used with slim cigarette boxes. Additionally, the inner liner paper has a 0.5cm wide tear-off edge with printed graduations, allowing users to fine-tune it to fit the actual dimensions of the cigarette box, enhancing its versatility.

[0029] The outer anti-friction layer 1 has a 1cm×3cm transparent window 11 at the edge of the high-density moisture-absorbing zone 21, which contains a gradient color-changing silicone strip 12. The color-changing range of the silicone strip is: light blue when the moisture absorption is 0g, light purple when the moisture absorption is 7.5g, and light pink when the moisture absorption is 15g. The transparent window 11 is marked with "Light purple requires attention, light pink requires replacement" to help users intuitively judge when to replace it.

[0030] The outer anti-friction layer 1 and the inner bonding layer 3 are provided with a self-adhesive heat-sealing strip at the perimeter heat-sealing area, including food-grade heat-sealing adhesive coated on the edge of the outer anti-friction layer 1 and release paper covering the surface of the heat-sealing adhesive; users can achieve sealing by manually pressing, without additional tools, reducing the difficulty of sealing; at the same time, the outer anti-friction layer 1 and the inner bonding layer 3 are connected by perimeter heat sealing and central dot-shaped adhesive, with a 0.1mm air gap reserved between them to ensure that the humidity inside the packaging is evenly conducted to the moisture-absorbing layer.

[0031] Furthermore, the outer anti-friction layer 1 has contour lines embossed on its surface corresponding to the functional areas of the three-dimensional partitioned moisture-absorbing layer 2, and each contour line has a scale for the amount of desiccant filled. The microencapsulated desiccant is provided in dose-specific packaging, with the high-density desiccant dose being 6g / packet and the medium-density desiccant dose being 5g / packet, which makes it convenient for users to accurately replenish the desiccant.

[0032] The overall thickness of the inner liner paper is ≤0.5mm to avoid affecting the opening and closing of the cigarette box; after the cigarette box opening and closing test, its abrasion resistance is ≥50 times to ensure that it is not easily damaged during long-term use; the powder leakage rate of the packaging is ≤0.5% to prevent the desiccant from leaking and contaminating the cigarettes; the volatile organic compound (VOCs) content of the treated inner liner paper is ≤0.1mg / kg, which meets environmental protection and health requirements; at the same time, the inner liner paper can stably maintain the moisture content of the cigarettes in the optimal range of 12-14%, with a moisture content fluctuation error of ≤±0.8%, ensuring the consistency of the cigarettes' taste and quality.

[0033] Example 1: Preparation of highly hygroscopic inner lining paper suitable for tobacco curing boxes.

[0034] The outer anti-friction layer 1 is made of food-grade breathable cotton paper conforming to GB4806.8 standard, with a thickness of 0.1mm, and the surface is coated with food-grade acrylic resin for micro-coating; the inner bonding layer 3 is made of food-grade breathable cotton paper conforming to GB4806.8 standard, with a thickness of 0.1mm, and the pre-pressed positioning texture is designed according to the radius of curvature of the inner wall of the tobacco box of 3mm; the core material of the microencapsulated desiccant is a mixture of calcium chloride, tobacco-grade montmorillonite, and food-grade activated alumina in a ratio of 7:5:3 (mass ratio), and the wall material is food-grade HPMC; the microcapsules are prepared by spray drying, with the particle size controlled at 100-200μm and the encapsulation rate ≥98%; the microcapsules are deodorized by standing in a vacuum environment at 30℃ for 2 hours.

[0035] The edge buffer material is a 0.5mm thick food-grade sponge with a density of 0.05g / cm³. 2 ; Food-grade self-adhesive epoxy sealant, 5mm wide; food-grade heat sealant made of acrylic esters, release paper made of silicone oil, gradient color-changing silicone strip, 3cm long and 1cm wide.

[0036] The specific process is as follows: Low-temperature deodorization treatment: Soak the cotton paper of the outer anti-friction layer 1 and the inner bonding layer 3 in 60℃ deionized water for 10 minutes, take them out and put them in a 45℃ constant temperature drying oven to dry for 2 hours, and cool to room temperature for later use. Processing of the outer anti-friction layer 1: A micro-coating with a thickness of 5μm is coated on the surface of the cotton paper. After drying, the functional area outlines of the three-dimensional partitioned moisture-absorbing layer 2 are imprinted, with a high-density area of ​​40%, a medium-density area of ​​35%, and an edge buffer area of ​​25%. The desiccant filling amount scale is printed in each outline. The high-density area is 6g and the medium-density area is 5g. At the same time, a 1cm×3cm window is cut at the edge of the high-density area, a gradient color-changing silicone strip 12 is embedded, and the window is sealed with a transparent food-grade film to form a transparent window 11.

[0037] The assembly method of the three-dimensional partitioned moisture absorption layer 2 is as follows: High-density moisture-absorbing zone 21 filling: At a dosage of 6g / tablet, the microencapsulated moisture absorber (density 0.12g / cm²) is evenly spread within the outline of the high-density zone of the outer anti-friction layer 1; Medium-density moisture-absorbing zone 22 filling: At a dosage of 5g / tablet, add microencapsulated moisture-absorbing agent (density 0.08g / cm³). 2 It is evenly spread within the outline of the medium-dense area of ​​the outer anti-friction layer 1; Edge buffer assembly 23: Cut the food-grade sponge into a shape that matches the edge buffer contour and attach it to the edge buffer contour of the outer anti-friction layer 1.

[0038] The overall assembly method is as follows: Food-grade self-adhesive epoxy sealant is pasted on both sides of the inner bonding layer 3, with the length consistent with the length of the inner liner paper. The pre-pressed positioning texture of the inner bonding layer 3 is placed inward and covered on the surface of the three-dimensional partitioned moisture-absorbing layer 2. The perimeter is heat-sealed using a heat-sealing machine at a temperature of 80℃, a pressure of 0.2MPa, and a time of 5s. Dot-like bonding is used in the middle area, with a dot spacing of 5mm and a bonding point diameter of 2mm. During the heat-sealing process, a 0.1mm air gap is maintained between the outer and inner layers. Then, food-grade heat-sealing adhesive with a thickness of 10μm is applied to the surface of the outer anti-friction layer 1 at the perimeter heat-sealed area, and release paper is covered to form a self-adhesive heat-sealed edge strip. Finally, a 0.5cm wide tearable edge is cut from the four edges of the inner liner paper, and scale lines with an accuracy of 1mm are printed on them using a laser engraving machine.

[0039] The prepared inner lining paper (84mm × 55mm) was subjected to performance testing, and the results are as follows: Overall thickness: 0.45mm (≤0.5mm, meets requirements); Abrasion resistance: 62 cycles (≥50 cycles, meets requirements); Encapsulation powder leakage rate: 0.3% (≤0.5%, meets requirements); VOCs content: 0.08 mg / kg (≤0.1 mg / kg, meets the requirements); Moisture absorption performance: In an environment with a temperature of 25℃ and a relative humidity of 60%, the silicone strip turns light pink when the moisture absorption reaches 15g; when it is placed in a tobacco curing box (containing 20 tobaccos) and left to stand for 7 days, the moisture content of the tobacco sticks is maintained at 12.5-13.2%, with a fluctuation error of ±0.35% (≤±0.8%, which meets the requirements).

[0040] Example 2: Preparation of highly hygroscopic inner lining paper suitable for slim cigarette boxes.

[0041] The difference from Example 1 is as follows: The overall dimensions of the inner lining paper have been adjusted to 97mm × 48mm; The curvature of the pre-pressed positioning pattern is designed according to the inner wall curvature radius of 2.5mm for thin cigarette boxes; The dosage of the microencapsulated desiccant was adjusted to 5.5g / packet for the high-density zone and 4.5g / packet for the medium-density zone; this was adapted to the length and volume of slim cigarettes. Final performance test results: overall thickness 0.42mm, abrasion resistance 58 times, encapsulation powder leakage rate 0.25%, VOCs content 0.07mg / kg, cigarette moisture content maintained at 12.3-13.5%, fluctuation error ±0.4%, all meeting design requirements.

[0042] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A highly absorbent moisture-absorbing inner lining paper for cigarette packaging, characterized in that, include: The outer anti-friction layer, the three-dimensional partitioned moisture-absorbing layer, and the inner bonding layer are arranged sequentially from the outside to the inside; the outer anti-friction layer is a food-grade breathable cotton paper that conforms to GB4806.8 standard, and its surface is treated with a micro-coating. The three-dimensional zoned moisture-absorbing layer includes three functional zones divided along the length of the cigarette: a high-density moisture-absorbing zone corresponding to the tobacco end, a medium-density moisture-absorbing zone corresponding to the filter end, and an edge buffer zone surrounding the high-density and medium-density moisture-absorbing zones. The high-density moisture-absorbing zone accounts for 40% of the total area of ​​the three-dimensional zoned moisture-absorbing layer, the medium-density moisture-absorbing zone accounts for 35% of the total area of ​​the three-dimensional zoned moisture-absorbing layer, and the edge buffer zone accounts for 25% of the total area of ​​the three-dimensional zoned moisture-absorbing layer. The high-density moisture-absorbing zone is filled with a density of 0.12 g / cm³. 2 The microencapsulated desiccant, wherein the medium-dense desiccant zone is filled with a density of 0.08 g / cm³. 2 The microencapsulated desiccant has a food-grade sponge with a thickness of 0.5 mm built into the edge buffer zone; The inner bonding layer is a food-grade breathable cotton paper with pre-pressed positioning texture, and the curvature of the pre-pressed positioning texture is adapted to the curvature of the inner wall of the cigarette box. The outer anti-friction layer and the inner bonding layer are connected by peripheral heat sealing and central dot bonding, with a 0.1mm air gap reserved between them.

2. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, The microencapsulated desiccant consists of a core material and a wall material; the core material is a mixture of calcium chloride and tobacco-grade montmorillonite in a mass ratio of 7:5; the wall material is food-grade hydroxypropyl methylcellulose (HPMC); the microcapsules have a particle size of 100-200 μm and a microencapsulation coverage rate of ≥98%.

3. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, It also includes a detachable connection structure; the connection structure is a food-grade self-adhesive epoxy sealant applied to both sides of the inner bonding layer, the epoxy sealant being used to detachably attach the inner lining paper to the inner wall of the cigarette box.

4. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, The overall dimensions of the inner lining paper are adapted to the specifications of cigarette packaging: 84mm×55mm when used with a flue-cured tobacco box, and 97mm×48mm when used with a slim cigarette box; and the edge of the inner lining paper is provided with a tearable edge with a width of 0.5cm, and the surface of the tearable edge is printed with scale lines.

5. The highly absorbent moisture-absorbing inner lining paper for cigarette packaging according to claim 1, characterized in that, The outer anti-friction layer has a 1cm×3cm transparent window at the edge of the high-density moisture-absorbing zone. A gradient color-changing silicone strip is built into the transparent window. The color-changing range of the gradient color-changing silicone strip is: light blue when the moisture absorption is 0g, light purple when the moisture absorption is 7.5g, and light pink when the moisture absorption is 15g. The transparent window is marked with the following markings: light purple requires attention, light pink requires replacement.

6. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, Both the outer anti-friction layer and the inner bonding layer undergo low-temperature deodorization treatment: the low-temperature deodorization treatment includes soaking the cotton paper in deionized water at 60°C for 10 minutes and then drying it at a constant temperature of 45°C; the microencapsulated desiccant undergoes deodorization treatment by being vacuum-treated at 30°C for 2 hours; after treatment, the volatile organic compound (VOC) content of the inner lining paper is ≤0.1mg / kg.

7. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, The outer anti-friction layer has contour lines embossed on its surface, corresponding to the functional areas of the three-dimensional partitioned moisture-absorbing layer, and each contour line has a scale indicating the amount of desiccant filling. The microencapsulated desiccant is provided in dose-specific packaging, with the high-density desiccant dose being 6g / packet and the medium-density desiccant dose being 5g / packet.

8. The highly absorbent moisture-absorbing inner lining paper for cigarette packaging according to claim 1, characterized in that, The outer anti-friction layer and the inner bonding layer are provided with a self-adhesive heat-sealing strip around the heat-sealing area; the self-adhesive heat-sealing strip includes food-grade heat-sealing adhesive coated on the edge of the outer anti-friction layer and release paper covering the surface of the heat-sealing adhesive, and the self-adhesive heat-sealing strip can be sealed by manual pressing.

9. The highly absorbent liner paper for cigarette packaging according to claim 1, characterized in that, The overall thickness of the inner lining paper is ≤0.5mm, and after a cigarette box opening and closing test, its abrasion resistance is ≥50 times, and the powder leakage rate of DIY packaging is ≤0.5%.

10. The highly absorbent moisture-absorbing inner lining paper for cigarette packaging according to claim 1, characterized in that, The microencapsulated desiccant also contains food-grade activated alumina, which accounts for 20% of the total mass of the core material; the inner liner paper is used to maintain the moisture content of the cigarette in the range of 12-14%, with a moisture content fluctuation error of ≤±0.8%.

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