Bidirectional humidifying bag and preparation method thereof, sealed container humidifying system and method for prolonging shelf life of nicotine product

Abstract

The invention discloses a two-way humidity adjusting bag and a preparation method thereof, a sealed container humidity adjusting system and a method for prolonging the shelf life of nicotine products, the two-way humidity adjusting bag is used for production, storage and transportation of the nicotine products, the two-way humidity adjusting bag comprises a humidity adjusting base material, and the humidity adjusting base material comprises a humidity adjusting composition, the humidifying composition is used for maintaining the water activity in the sealed container within a preset water activity range within a preset temperature range; the moisture-adjusting base material is coated with the packing material, at least one surface of the packing material is a moisture-permeable and liquid-impermeable functional film, and the moisture-permeable and liquid-impermeable functional film meets the condition that the water vapor permeability is 1000-3000g. M <-2 >. D <-1 > under the conditions that the temperature is 25 DEG C and the relative humidity is 85%; when the two-way humidity adjusting bag acts together with the nicotine product in the sealed container, the two-way humidity adjusting bag can slowly release and transfer water to the nicotine product at a controlled rate until a set balance is achieved under the condition that the water activity base line in the sealed container is kept constant.

Description

Technical Field

[0001] This invention relates to the field of humidity control technology, and in particular to a two-way humidity control pack and its preparation method, a sealed container humidity control system, and a method for extending the shelf life of nicotine products. Background Technology

[0002] Nicotine pouches are highly sensitive to moisture content and water activity: too low a moisture content results in slow onset of action, a dry taste, and powdering; too high a moisture content can cause dripping, increased irritation, and unstable flavor, and also increases the risk of microbial and chemical instability. Current practices often set the target moisture content directly during the formulation and pouch-making stages, which lengthens the process cycle, reduces packaging qualification rate, and further deviates due to temperature and humidity fluctuations during transportation and storage. Common one-way humectants are difficult to maintain a stable target water activity in the same confined space for a long time, and cannot quantitatively rehydrate the product at a controlled rate while ensuring that the water activity baseline remains unchanged. Summary of the Invention

[0003] In view of the above-mentioned shortcomings, the present invention provides a two-way humidity control pack and its preparation method, a sealed container humidity control system, and a method for extending the shelf life of nicotine products. It can maintain a preset constant water activity within a target temperature range and slowly release and transfer moisture to dry nicotine products at a controlled rate, achieving coupled control of "constant water activity and moisture recovery", extending shelf life and maintaining stable experience.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: A two-way humidity control pack for the production and storage of nicotine products, the two-way humidity control pack comprising: A humidity-regulating substrate, the humidity-regulating substrate comprising a humidity-regulating composition, the humidity-regulating composition being used to maintain the water activity within a preset temperature range within a preset water activity range; and a packaging material covering the moisture-regulating substrate, wherein at least one side of the packaging material is a moisture-permeable but liquid-impermeable functional membrane, and the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor transmission rate of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 ; When the bidirectional humidity control pack works together with the nicotine product in a sealed container, it can slowly release and transfer moisture to the nicotine product at a controlled rate until a set equilibrium is reached while maintaining a constant water activity baseline in the sealed container.

[0005] According to one aspect of the present invention, the preset water activity is 0.8 to 0.95, and the fluctuation at 25°C does not exceed ±0.03.

[0006] According to one aspect of the invention, the humidity-regulating composition is cured via a gel or porous carrier and exhibits no free liquid precipitation at 40°C.

[0007] According to one aspect of the present invention, the moisture-permeable but liquid-impermeable functional membrane is a microporous polyolefin, a hydrophilic modified TPU, or a multilayer composite membrane.

[0008] According to one aspect of the present invention, the packaging material includes a barrier layer and a moisture-permeable layer disposed opposite to each other, the moisture-regulating substrate being disposed between the barrier layer and the moisture-permeable layer, the barrier layer being made of a low-moisture-permeable, high-barrier material, and the moisture-permeable layer being a moisture-permeable but liquid-impermeable functional membrane.

[0009] According to one aspect of the present invention, the low moisture permeability and high barrier material satisfies the requirement that the water vapor transmission rate at 25°C and 85% relative humidity is ≤2 g·m. -2 ·d -1 .

[0010] According to one aspect of the present invention, the humidity-regulating composition comprises a polyol, an inorganic salt, an organic salt, oligosaccharides, and water, which are cured by gel or porous carrier to form a humidity-regulating substrate.

[0011] According to one aspect of the invention, the humidity-regulating composition comprises a hydrophilic polymer and a gel, molded into a humidity-regulating substrate.

[0012] A sealed container humidity control system includes a sealed container containing a nicotine product and a two-way humidity control pack as described above, the amount of which is set according to the quantity of the nicotine product. The amount of the two-way humidity control pack is sufficient to maintain a preset constant water activity within a target temperature range and to slowly release and transfer moisture to the dry nicotine product at a controlled rate, so that the nicotine product returns to the target value within a preset time after the sealed container is sealed.

[0013] According to one aspect of the present invention, the preset water activity is 0.8-0.95, the target temperature range is 15-35°C, and the preset time is 1-7 days.

[0014] According to one aspect of the invention, the bidirectional humidity control pack is disposed at the bottom of a sealed container or under the lid, thereby creating a stable convection and diffusion path between the humidity control pack and the nicotine product.

[0015] According to one aspect of the present invention, the bidirectional humidity control package includes a barrier layer and a moisture-permeable layer disposed opposite to each other, the humidity control substrate being disposed between the barrier layer and the moisture-permeable layer, the barrier layer being made of a low moisture-permeable and high-barrier material, the moisture-permeable layer being a moisture-permeable but liquid-impermeable functional membrane, and the outer side of the barrier layer being fixedly attached to the bottom of a sealed container or the inner side of a sealed container lid.

[0016] A preparation method for preparing the bidirectional humidity control pack as described above includes the following steps: Prepare a humidity-regulating composition and form a humidity-regulating substrate; The packaging material comprises at least one moisture-permeable but liquid-impermeable functional membrane, wherein the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor permeability of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 ; The moisture-conditioning substrate is placed inside the packaging material and sealed.

[0017] According to one aspect of the present invention, the preparation method further includes the following steps: calibrating water activity using a water activity meter; and determining the place of arrival and controlling batch-to-batch consistency using water activity, mass increment, and release curve.

[0018] A method for extending the shelf life of nicotine products, the method comprising the following steps: Pack nicotine products with an initial moisture content lower than the target moisture content into sealed containers; Arrange the two-way humidity control pack as described above inside the container; Seal and store at 15-35℃ to allow the nicotine product to rehydrate to the target water content within 1-7 days, while maintaining the water activity in the container within the preset range of 0.8-0.95; During storage and circulation, the water activity is kept stable through the bidirectional humidity control function of the bidirectional humidity control package.

[0019] Advantages of implementing this invention: 1. Maintain a constant preset water activity within the target temperature range and slowly release moisture into dry nicotine products at a controlled rate, achieving coupled control of "constant aw and moisture recovery," extending shelf life and maintaining a stable experience. Constant aw + slow moisture release dual control: Quantitatively replenishing water to the nicotine pouch without altering the aw ensures a stable product experience and controllable microbial / chemical risks.

[0020] 2. Without altering the finished nicotine product's moisture content standard, the initial moisture content of the formula can be reduced during the production and packaging stages to improve production capacity and packaging qualification rate. After sealing, the moisture content will automatically return to the target value within a few days using this humidification pack, reducing overall manufacturing costs and consistency risks. Increased production capacity and yield: Allows nicotine bags to operate with lower moisture content during bag making / canning, reducing adhesion and clumping, and increasing equipment capacity and packaging qualification rate per unit time; the cans automatically return to the finished product standard after sealing. Shelf life and consistency: Two-way humidification maintains stable aw (aw rate) within the can, improving fluctuations during cross-climate transport and storage; reduces top / bottom variations within the same can and batch / inter-batch differences. Customizable parameters: aw rate, wVTR, and humidification pack dosage can be customized according to the optimal window for different brands / flavors / strengths.

[0021] During the production stage, nicotine bags can operate with lower initial moisture content, reducing adhesion and clumping, significantly improving equipment capacity and packaging qualification rate in the bag making / canning process, and reducing the risk of production inconsistency caused by high moisture content. After sealing, the humidification pack can rehydrate the nicotine bags to the target moisture content of the finished product within a few days, without changing the product's aw (awt). This not only meets the factory moisture content standard but also maintains product stability through slow-release moisture control, effectively controlling microbial growth and fluctuations in chemical indicators. During storage and distribution, the two-way humidification function dynamically balances the humidity inside the can, resisting changes in environmental humidity during cross-climate transportation or long-term storage, significantly reducing product differences between the top and bottom of the same can and between different batches, ensuring consistent quality throughout the shelf life. At the same time, the dosage of aw, WVTR, and humidification pack can be flexibly customized according to different brands, flavors, or strength requirements to meet diverse product design requirements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic cross-sectional view of a humidity regulating bag structure according to the present invention; Figure 2 This is a schematic diagram of the arrangement of the humidity control pack, nicotine bag, and can as described in this invention; Figure 3 This is a schematic diagram of the asymmetric humidity control package structure with single-sided barrier and single-sided moisture permeability as described in this invention, and its attachment in the tank. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 like Figure 1 , Figure 2 and Figure 3 As shown, a two-way humidity control pack is used for the production and storage of nicotine products. The two-way humidity control pack includes: A humidity-regulating substrate 1, comprising a humidity-regulating composition, wherein the humidity-regulating composition is used to maintain the water activity within a preset temperature range within a preset water activity range in a sealed container; the humidity-regulating composition is cured by a gel or porous carrier and does not release free liquid at 40°C.

[0026] and a packaging material covering the moisture-regulating substrate, wherein at least one side of the packaging material is a moisture-permeable but liquid-impermeable functional membrane, and the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor transmission rate of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 The packaging material includes a barrier layer 3 and a moisture-permeable layer 2 disposed opposite to each other. The moisture-regulating substrate is disposed between the barrier layer and the moisture-permeable layer. The barrier layer is made of a low-moisture-permeable, high-barrier material, and the moisture-permeable layer is a moisture-permeable but liquid-impermeable functional membrane. The low-moisture-permeable, high-barrier material satisfies a water vapor transmission rate ≤2 g·m³ at 25°C and 85% relative humidity. -2 ·d -1 The moisture-permeable but liquid-impermeable functional membrane is a microporous polyolefin, hydrophilic modified TPU, or a multilayer composite membrane.

[0027] When the bidirectional humidity control pack works in conjunction with the nicotine product within a sealed container, it can slowly release and transfer moisture to the nicotine product at a controlled rate until a set equilibrium is reached, while maintaining a constant baseline of water activity within the sealed container. The preset water activity is 0.8~0.95, and its fluctuation at 25°C does not exceed ±0.03.

[0028] In practical applications, the humidity-regulating composition can employ a polymer gel system, utilizing the vast network structure of hydrophilic polymers to absorb and lock in moisture, regulating moisture absorption and release through their hydrophilic-hydrophobic balance. The polymer molecular chains contain hydrophilic groups (such as -OH, -COOH), which can capture water molecules through hydrogen bonds. The physical structure of the gel network determines its moisture absorption and release kinetics. When the ambient humidity is high, the polymer network absorbs water and swells. When the ambient humidity is low, the moisture within the polymer network is released, and the network shrinks. The equilibrium humidity is determined by the type and concentration of the polymer. Common gel materials: Natural polymers: agar, sodium alginate, gelatin, carrageenan. Semi-synthetic / synthetic polymers: Sodium carboxymethyl cellulose (CMC-Na): commonly used and safe. Hydroxypropyl methylcellulose (HPMC): good film-forming properties. Sodium polyacrylate (PAAS): extremely absorbent (up to hundreds of times its own weight), but its moisture control precision is not as good as salt. Polyvinyl alcohol (PVA): good film-forming properties and high strength. Moisturizers (adjusting water activity): Glycerin, propylene glycol, sorbitol. These can reduce water activity, making the composition's water activity lower than that of pure water (water activity = 1.0), thus enabling the release of moisture into drier environments.

[0029] Specifically, the humidity-regulating composition comprises a hydrophilic polymer and a gel, molded into a humidity-regulating substrate. Depending on the specific needs, it may include several options, such as: Example reference is as follows: Mild moisturizing formula: 70% purified water, 15% glycerin, 10% CMC-Na, 0.2% preservative (such as potassium sorbate). The final aw value can be precisely controlled by adjusting the ratio of glycerin and water, for example, a target aw of 0.6-0.7.

[0030] Highly hygroscopic type: 80% pure water, 5% sodium polyacrylate, 10% propylene glycol, 0.2% preservative.

[0031] In practical applications, the humidity-regulating composition can be a composite system, typically using a polymer gel as a matrix and loading a saturated salt solution. The polymer gel acts as a "warehouse" and "transport channel," carrying and immobilizing the saturated salt solution, thus avoiding the risk of leakage. The final equilibrium humidity is determined by the type of salt added, achieving a perfect combination of precise humidity control by the salt and the safe carrier properties of the gel. In this embodiment, the humidity-regulating composition may include polyols, inorganic salts, organic salts, oligosaccharides, and water, which are cured by a gel or porous carrier to form a humidity-regulating substrate. Loading the humidity-regulating composition onto a gel or porous carrier (such as plant fiber substrate / cellulose / inorganic porous materials) and immobilizing it allows for the conversion of internal structured water and free water, preventing leakage of free liquid.

[0032] Depending on the specific application requirements, there are multiple formulation options available, such as: Purified water: 50%; Sodium chloride (or other target salt): 25% (determines the target aw, for example, NaCl corresponds to aw≈0.75); Sodium carboxymethyl cellulose (CMC-Na): 3% (as a thickener and gelling matrix); Glycerin: 20% (as a humectant and aw fine-tuning agent, and can increase gel plasticity); Preservative: 0.2% (to prevent microbial growth); pH adjuster: appropriate amount (to ensure stability).

[0033] In another embodiment, the following can be selected, for example: Humidity conditioning composition formulation: glycerol / propylene glycol / sorbitol / water mass ratio 35 / 15 / 3 / 47, with 1–3 wt% starch added; aw approximately 0.85 ± 0.03 (25°C).

[0034] Carrier: Plant fiber (850g·m -2 ).

[0035] Humidity conditioning package outer coating: single-sided high-barrier membrane (WVTR≈1g·m at 25°C and 85%RH)-2 ·d -1 ) + Single-sided functional composite membrane (WVTR≈2200g·m at 25°C and 85%RH) -2 ·d -1 ).

[0036] Humidity regulating pack weight: 4.7g.

[0037] Humidity regulating pack dimensions: 60mm in diameter, 3mm in thickness.

[0038] A humidity conditioning pack consists of a humidity conditioning substrate covered with a functional membrane (such as microporous polyolefin, hydrophilic modified TPU, composite membrane, or multilayer film with surface energy modulated) that is permeable to moisture but impermeable to liquid on at least one side. The WVTR (25°C, 85%RH) of the moisture-permeable but liquid-impermeable membrane system is set at 1000-3000 g·m³. -2 ·d -1 To achieve a mass transfer cycle of "recovery within several days and steady-state maintenance within weeks"; The humidification pack can employ an asymmetric laminated structure: a directional slow-release structure with single-sided barrier and single-sided permeability. The side closest to the tank wall is made of a low-permeability, high-barrier material (such as aluminum foil composite / high-barrier coating film, with WVTR ≤ 2 g·m³ at 25°C and 85% RH). -2 ·d -1 ), and are attached to the bottom of the can or the inside of the can lid by means of hot melt adhesive / pressure-sensitive adhesive / heat-sealing dot tape / friction matching, etc. On the opposite side is a moisture-permeable but water-impermeable food-grade functional membrane (such as microporous polyolefin / hydrophilically modified TPU / composite membrane, WVTR 1000–3000 g·m). -2 ·d -1 (The hydrostatic pressure or water inlet pressure meets the requirement of being leak-proof).

[0039] This asymmetric structure enables directional moisture release: water vapor preferentially targets the internal space and nicotine bag, inhibiting ineffective diffusion to the plastic tank wall and the outside, preventing moisture from diffusing out of the plastic tank, reducing moisture loss, and maintaining the long-term stability of the internal moisture reservoir and the target air volume.

[0040] In practical applications, the specific design of the humidification pack is mainly considered based on the following conditions: 1. Aw value control: This is mainly achieved by adjusting the ratio of glycerin, propylene glycol, and water. Glycerin and propylene glycol are highly hygroscopic and safe humectants that can effectively reduce the water activity of the system. The higher their content, the lower the aw value of the final formulation is usually.

[0041] 2. WVTR regulation: This is achieved by replacing functional composite membranes with different water vapor permeability rates, which directly affects the rate of water exchange.

[0042] 3. Carrier and Structure: Maintaining a constant weight, a high-grammage plant fiber pad (850 g·m⁻²) is used as the carrier to ensure good liquid adsorption and storage capacity. The structure is a directional moisture release design with a single-sided high-barrier (WVTR≈1) + single-sided functional composite membrane.

[0043] 4. Starch function: It acts as a thickener and stabilizer to prevent liquid phase separation. The amount added should be finely adjusted between 1% and 3%.

[0044] Here are a few feasible examples for reference: Implementation details: Application Example 1: Low water activity & slow rewetting type; Target aw value: 0.80±0.03 (25℃); Functional composite membrane WVTR: 1000 g·m⁻²·d⁻¹ (lower moisture permeability, slower moisture exchange); Humidity conditioning composition formulation: Glycerin: 40%; Propylene Glycol: 18%; Sorbitol: 3%; Pure water: 39%; Starch: 2.5 wt% (based on the total mass of the above mixture); Carrier: Plant fiber mat, 850 g·m⁻²; The outer coating of the humidity control package is: a single-sided high-barrier membrane (WVTR≈1) + a single-sided functional composite membrane (WVTR=1000); Humidity regulating packet weight: ~4.7g; Features and applications: Features: The high content of glycerol and propylene glycol creates a low water activity environment, which effectively inhibits the growth of most molds and yeasts (most molds have a minimum growth aw > 0.8). The low WVTR makes the water release process very slow and controllable.

[0045] Application preferences: Ideal for finishing high-strength nicotine products requiring extremely long shelf lives or those more sensitive to AWE fluctuations. Suitable for storage and transportation of products in hot and humid climates.

[0046] Application Example 2: General Equalization Type; Target aw value: 0.88±0.03 (25℃); Functional composite membrane WVTR: 2200 g·m⁻²·d⁻¹ (medium moisture permeability, balanced moisture exchange rate); Humidity conditioning composition formulation: Glycerin: 32%; Propylene glycol: 14%; Sorbitol: 3%; Purified water: 51%; Starch: 2.0 wt% Carrier: Plant fiber mat, 850 g·m⁻²; The outer coating of the humidity control package is: a single-sided high-barrier membrane (WVTR≈1) + a single-sided functional composite membrane (WVTR=2200); Humidity regulating packet weight: ~4.7g; Features and applications: Features: This is a very well-balanced formula with an AW value in the comfort zone of common oral nicotine products, providing a good balance between taste, microbial safety, and nicotine release stability. A WVTR of 2200 is a proven, high-efficiency rate.

[0047] Application preference: As a baseline formulation, it is suitable for most traditional tobacco flavors or medium-strength nicotine pouch products and is one of the most widely used types.

[0048] Application Example 3: High water activity & rapid rewetting type; Target aw value: 0.93±0.03 (25℃); Functional composite membrane WVTR: 3000 g·m⁻²·d⁻¹ (high moisture permeability, fast moisture exchange); Humidity conditioning composition formulation: Glycerin: 25%; Propylene glycol: 10%; Sorbitol: 3%; Purified water: 62%; Starch: 1.5 wt% Carrier: Plant fiber mat, 850 g·m⁻²; The outer coating of the humidity control package is: a single-sided high-barrier membrane (WVTR≈1) + a single-sided functional composite membrane (WVTR=3000); Humidity regulating packet weight: ~4.7g; Features and applications: Features: High moisture content and low humectant ratio result in an aw value close to that of pure water. The high WVTR membrane allows for rapid moisture transfer.

[0049] Application Tendencies: Ideal for production processes requiring rapid rehydration (e.g., aiming to reach equilibrium within 24-48 hours). Suitable for "wet" mouthwashes or certain flavored nicotine pouches that require a very soft, moist texture. Note that the risk of microbial contamination is slightly higher, and stricter hygiene requirements apply to production.

[0050] Application Example 4: Emphasizing stability and security; Target aw value: 0.82±0.03 (25℃); Functional composite membrane WVTR: 1500 g·m⁻²·d⁻¹ (medium to low speed moisture permeability); Humidity conditioning composition formulation: Glycerin: 38%; Propylene glycol: 17%; Sorbitol: 3%; Purified water: 42%; Starch: 3.0 wt% (A slightly higher starch content helps stabilize formulations with higher viscosity); Carrier: Plant fiber mat, 850 g·m⁻²; The outer coating of the humidity control package is: a single-sided high-barrier membrane (WVTR≈1) + a single-sided functional composite membrane (WVTR=1500); Humidity regulating packet weight: 4.7g; Features and applications: Features: The aw value is set at 0.82, slightly higher than the growth threshold of most molds, providing a high safety margin for microorganisms. The moderately slow WVTR makes the rewetting process more stable and gentle.

[0051] Application preferences: Suitable for products with extremely high requirements for microbial control, or for formulations containing perishable ingredients (such as certain natural plant extracts). Also suitable as part of long-distance transportation solutions with a large safety margin.

[0052] Application Example 5: Rapid High Humidity Type; Target aw value: 0.90±0.03 (25℃); Functional composite membrane WVTR: 2700 g·m⁻²·d⁻¹ (high-speed moisture permeability); Humidity conditioning composition formulation: Glycerin: 29%; Propylene glycol: 12%; Sorbitol: 3%; Purified water: 56%; Starch: 1.0 wt% Carrier: Plant fiber mat, 850 g·m⁻²; The outer coating of the humidity regulating package consists of a single-sided high-barrier membrane (WVTR≈1) and a single-sided functional composite membrane (WVTR=2700). Humidity regulating pack weight: ~4.7g.

[0053] Features and applications: Features: While providing a high aw value (ensuring a moist mouthfeel), it achieves rapid moisture balance through a high WVTR membrane. The content of glycerol and propylene glycol is sufficient to stabilize the aw at 0.9, rather than 1.0 as in pure water.

[0054] Application preference: Suitable for products that require high water content and fast production cycles. For example, some flavors that emphasize "refreshing popping boba" or "juicy texture" need more water to carry and release flavor compounds.

[0055] Example 2 A sealed container humidity control system includes a sealed container containing a nicotine product 4 and a two-way humidity control pack as described in Example 1, the amount of which is set according to the quantity of the nicotine product. The amount of the two-way humidity control pack is sufficient to maintain a preset constant water activity within a target temperature range and to slowly release and transfer moisture to the dry nicotine product at a controlled rate, so that the nicotine product returns to the target value within a preset time after the sealed container is sealed.

[0056] In practical applications, the preset water activity is 0.8-0.95, the target temperature range is 15-35℃, and the preset time is 1-7 days.

[0057] In practical applications, the bidirectional humidity control pack is placed at the bottom of a sealed container or under the lid, so that the humidity control pack and the nicotine product form a stable convection and diffusion path.

[0058] In practical applications, the bidirectional humidity control package includes a barrier layer and a moisture-permeable layer arranged opposite to each other. The humidity control substrate is disposed between the barrier layer and the moisture-permeable layer. The barrier layer is made of a low moisture-permeable and high-barrier material, and the moisture-permeable layer is a moisture-permeable but liquid-permeable functional membrane. The outer side of the barrier layer is fixedly attached to the bottom of a sealed container or the inner side of the sealed container lid.

[0059] The humidification pack is fixed / placed in the bottom or inside the lid of the can (containing 10–30 nicotine bags) to create a stable convection / diffusion path between the humidification pack and the nicotine bags; When packaging, the nicotine bag is placed into the can in a "low initial moisture content" state. After sealing, it is allowed to rehydrate to the target moisture content and reach equilibrium with the humidification pack within 1–7 days. Throughout its lifespan, the humidity control pack maintains stable ambient humidity (AUD) within the can through a two-way humidity control mechanism (absorbing moisture when AUD is high and releasing moisture when AUD is low), thereby keeping the moisture content of the nicotine bag within the target range.

[0060] Both the barrier and the breathable surfaces are made of food-safe materials and ink / adhesive systems, making them suitable for direct or indirect contact scenarios with nicotine bags. The humidification pack is preferably fixed to the bottom / inside of the can by means of "annular adhesive channel", "dot matrix heat sealing" or "mechanical buckle" to form a stable interface and avoid displacement; Without altering the can's appearance or assembly process, the mass transfer path is limited to "humidification pack → can interior space → nicotine bag," further reducing the total water loss rate before opening and extending shelf life.

[0061] The following demonstration will be based on specific experiments: Experimental example: The quantitative relationship (25°C) between oral flue gas water activity (Aw) and water content (MC) is approximately linear, with a target MC ≈ 30–40% corresponding to Aw ≈ 0.80–0.90. See Table 2 below: The fitting result based on the test results is: MC = 1.561 × Aw − 1.007 (R ≈ 0.998). Therefore, MC = 40% corresponds to Aw ≈ 0.90; MC = 35% corresponds to Aw ≈ 0.85.

[0062] Table 2:

[0063] The specific experimental procedure is as follows: The portion of the cigarette containing the sample was dehydrated so that its initial moisture content was around 15-20%, its water activity was between 0.55 and 0.65, and the initial net weight of the entire pack of cigarettes containing the sample was around 8.5 + / - 0.8 grams.

[0064] A humidification tablet with a water activity of 0.95 (average net weight 4.5 g) was prepared and placed in the partially dehydrated dry cigarette box mentioned above as the experimental group; at the same time, a batch of blank control group (without humidification tablet) with the same partial dehydration was prepared; the cigarettes were stored at 25℃ and different relative humidities (RH 20% / 40% / 60% / 80%) for 30 days (720 h), and the changes in humidity inside the box, the changes in the weight of the whole box, and the weight and water activity of the cigarettes before and after 30 days were recorded and analyzed.

[0065] The initial conditions of the experimental group and the blank control group are shown in Table 3 below: Table 3:

[0066] The weight and water activity of the experimental group and the blank control group, and their changes, were recorded after 720 hours, as shown in Table 4 below: Table 4:

[0067] The changes in each group over time during the 720 hours recorded during the experiment are shown in Table 5 below: Table 5:

[0068] The following are the specific analytical results obtained from the analysis of the 720-hour experimental data of the experimental group and the blank control group: 1. Key Insights and Analysis: 1) Steady-state humidity and fluctuation: At 25℃ and RH=20 / 40 / 60 / 80%, the humidity fluctuation in the "with humidity control sheet" group is small (±1–2%RH); the RH in the "without humidity control sheet" group changes significantly with the environment, with the mean consistent with the environment and the standard deviation larger.

[0069] 2) 30-day moisturizing effect (with humidifier tablets vs. without humidifier tablets): With humidity control tablets: within the RH range of 20-80%, the final Aw of the smoke in the mouth is generally 0.84-0.91 (meeting the standard), with an average increase of +0.24 to +0.27; Without humidification tablets: There is no significant change at RH 20–60%. At RH 80%, the Aw of the cigarette in the mouth increases due to the permeability of the cigarette box.

[0070] The weight gain from water absorption of oral cigarettes increases with increasing ambient RH (RH20%≈+0.93g→RH80%≈+1.99g / box); the corresponding ΔAw is approximately in the range of +0.24~+0.27 (not strongly linearly dependent on RH, but more in line with "achieving the target bandwidth" rather than "the more the better").

[0071] 3) Mass transfer rate (overall mass trend): The experimental group with humidification tablets showed a daily average negative slope in the overall mass (typically -0.02~-0.025 g / day in a dry environment and -0.004 g / day in a humid environment), indicating that the drier the external environment, the faster the net water release rate; the blank group without humidification tablets mostly remained flat or slowly increased.

[0072] 2. Quantitative comparative analysis (25℃ / 30 days): RH20%: With humidification tablets, ΔAw≈+0.267 (0.576→0.843), oral weight gain of smoke +0.93g; without tablets, ΔAw≈+0.017.

[0073] RH40%: With humidification tablets, ΔAw≈+0.256 (0.586→0.841), oral weight gain of smoke +1.18g; without tablets, ΔAw≈+0.016.

[0074] RH60%: With humidification tablets, ΔAw≈+0.238 (0.647→0.885), oral weight gain of smoke +1.32g; without tablets, ΔAw≈+0.025.

[0075] RH80%: With humidification tablets, ΔAw≈+0.257 (0.654→0.911), oral weight gain of smoke +1.99g; without tablets, ΔAw≈+0.134.

[0076] Conclusion: At 25℃, some tablets can quickly bring the oral tobacco to the target bandwidth of Aw≈0.85–0.90+; the more humid the outside environment, the more water the oral tobacco itself stores, and the higher the final Aw tends to be, but the overall increase still remains around ~0.25.

[0077] 3. Stability and Rate Analysis: Steady-state bandwidth: The RH inside the test box with the humidity control plate was concentrated in a narrow fluctuation band of ±1–2%RH under various external RH levels; Stabilization time: Typically, it takes 7-15 days to advance to Aw≥0.85; Net water release rate (the rate at which moisture migrates from the humidifying sheet into the mouth-held tobacco): RH20%: ~−0.025g / day (drier → faster water release); RH40%: ~−0.021g / day; RH 60%: ~−0.014g / day; RH80%: ~−0.004g / day; Environmental priority: The drier the environment during production / storage (RH20–40%), the faster the net water release; under RH80% environment, oral tobacco first fully absorbs water (higher tablet weight gain), and the Aw endpoint is more likely to approach or exceed 0.90.

[0078] Example 3 A preparation method for preparing a two-way humidity control pack as described in Example 1 includes the following steps: Step S1: Prepare the humidity-conditioning composition and form a humidity-conditioning substrate; Based on the various application examples in Example 1, you can select and manufacture according to your actual needs.

[0079] Step S2: Fabricate packaging material, wherein the packaging material comprises at least one moisture-permeable but liquid-impermeable functional membrane, and the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor permeability of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 ; Step S3: Place the moisture-conditioning substrate into the packaging material and seal it.

[0080] In practical applications, the preparation method further includes the following steps: water activity calibration using a water activity meter; and determination of availability and batch-to-batch consistency control using water activity, mass increment, and release curve.

[0081] In practical applications, the following processes and quality control measures are involved: Ingredient preparation → Water activity sampling inspection → Gelification / loading → Humidity conditioning substrate weight detection → Encapsulation (single-sided aluminum foil + single-sided functional composite film) → Packaging → Labeling → Warehousing; Applications: Spot checks of moisture content in conditioning packs; moisture content checks of moisture content in the moisture content of the moisture content in the moisture content of the humidification pack and the nicotine bag inside the can on days 1, 3, and 7 after filling; abnormalities are handled by replacing the batch or extending the equilibration time.

[0082] Calibration and Verification: The humidity control pack is calibrated with an AW meter using a water activity meter before leaving the factory. The determination of in-place status and batch-to-batch consistency control are achieved by using "aw (dew point / electron microscopy) + mass increment + release curve (t10 / t50 / t90)".

[0083] Among them, the dew point / electron microscopy method specifically includes the dew point method and the electron microscopy method (also known as the electro-sensor method): the dew point method is one of the most direct and commonly used standard methods for measuring water activity; the electron microscopy method is the electro-sensor method: this is an indirect method for measuring or predicting water activity, and usually requires calibration based on standard methods such as the dew point method.

[0084] Product advantages: 1. Constant aw + slow-release water control: Quantitative water replenishment to the nicotine pouch without changing the aw ensures a stable product experience and controllable microbial / chemical risks.

[0085] 2. Increased capacity and yield: Allows nicotine pouches to operate with lower moisture content during the bag making / canning stage, reducing adhesion and clumping, and increasing the equipment's capacity and packaging qualification rate per unit time; the cans are automatically rehydrated to the finished product standard after sealing.

[0086] 3. Shelf life and consistency: Two-way humidity control maintains stable air temperature (AW) within the can, improving fluctuations during transportation across climate zones and during the storage period; reduces differences between the top / bottom of the same can and between batches.

[0087] 4. Parameters can be customized: aw, WVTR, and humidity pack dosage can be customized according to the optimal window for different brands / flavors / strengths.

[0088] (iv) Brand-adaptive parameterized implementation example (high aw / high WVTR): For some nicotine bag brands that require operation at higher preset water activity levels, the following parameterization solution is provided: Target aw (25°C): 0.80–0.95; WVTR (25°C, 85%RH): 1000–3000 g·m⁻²·d⁻¹ (permeable but impermeable to water, food contact grade); Can specifications: 20 bags / can; Humidity conditioning packaging capacity: 5g / can; Expected shelf life: ≥12 months; Design highlights: Directional slow release is achieved through "high WVTR permeable surface × barrier backing"; while maintaining the target aw, the nicotine bag moisture content is restored within a few days after filling, and water loss to the outside through the can wall is reduced during periodic storage.

[0089] Example 4 A method for extending the shelf life of nicotine products, the method comprising the following steps: Step S01: Pack the nicotine product 4, whose initial water content is lower than the target water content, into a sealed container; Step S02: Arrange the two-way humidity control pack as described above inside the container; Step S03: Seal and store at 15-35℃ to allow the nicotine product to rehydrate to the target water content within 1-7 days, while maintaining the water activity in the container within the preset range of 0.8-0.95; Step S04: During storage and circulation, the water activity is kept stable through the bidirectional humidity control function of the bidirectional humidity control package.

[0090] The humidification pack is fixed / placed in the bottom or inside the lid of the can (containing 10–30 nicotine bags) to create a stable convection / diffusion path between the humidification pack and the nicotine bags; When packaging, the nicotine bag is placed into the can in a "low initial moisture content" state. After sealing, it is allowed to rehydrate to the target moisture content and reach equilibrium with the humidification pack within 1–7 days. Throughout its lifespan, the humidity control pack maintains stable ambient humidity (AUD) within the can through a two-way humidity control mechanism (absorbing moisture when AUD is high and releasing moisture when AUD is low), thereby keeping the moisture content of the nicotine bag within the target range.

[0091] In practical applications, nicotine bags (20 bags per can) are introduced into the can with an initial moisture content of 14% (target moisture content 28%); a humidification pack is placed at the bottom of the can and sealed; the can is placed at 25°C for 2–5 days to rehydrate to the target moisture content and reach aw equilibrium (0.85) with the humidification pack; during subsequent storage and transportation, the aw inside the can is maintained within the range of 0.85±0.05. Meanwhile, under 25°C and 50%RH conditions for 12 months, the aw of the nicotine bags inside the can is 0.827, meeting the requirements.

[0092] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A two-way humidity regulating pack for the production and storage of nicotine products, characterized in that, The two-way humidity control pack includes: A humidity-regulating substrate, the humidity-regulating substrate comprising a humidity-regulating composition, the humidity-regulating composition being used to maintain the water activity within a preset temperature range within a preset water activity range; and a packaging material covering the moisture-regulating substrate, wherein at least one side of the packaging material is a moisture-permeable but liquid-impermeable functional membrane, and the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor transmission rate of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 ; When the bidirectional humidity control pack works together with the nicotine product in a sealed container, it can slowly release and transfer moisture to the nicotine product at a controlled rate until a set equilibrium is reached while maintaining a constant water activity baseline in the sealed container.

2. The bidirectional humidity regulating pack according to claim 1, characterized in that, The preset water activity is 0.8~0.95, and the fluctuation at 25℃ does not exceed ±0.

03.

3. The bidirectional humidity regulating pack according to claim 1, characterized in that, The humidity-regulating composition is cured by a gel or porous carrier and no free liquid is released at 40°C.

4. The bidirectional humidity regulating pack according to claim 1, characterized in that, The moisture-permeable but liquid-impermeable functional membrane is a microporous polyolefin, hydrophilic modified TPU, or a multilayer composite membrane.

5. The bidirectional humidity regulating pack according to claim 1, characterized in that, The packaging material includes a barrier layer and a moisture-permeable layer disposed opposite to each other, and the moisture-regulating substrate is disposed between the barrier layer and the moisture-permeable layer. The barrier layer is made of a low-moisture-permeable and high-barrier material, and the moisture-permeable layer is a moisture-permeable but liquid-impermeable functional membrane.

6. The bidirectional humidity regulating pack according to claim 5, characterized in that, The low-permeability, high-barrier material meets the water vapor transmission requirements at 25°C and 85% relative humidity. .

7. The bidirectional humidity control pack according to any one of claims 1 to 6, characterized in that, The humidity-regulating composition comprises polyols, inorganic salts, organic salts, oligosaccharides, and water, which are cured by gel or porous carrier to form a humidity-regulating substrate.

8. The bidirectional humidity control pack according to any one of claims 1 to 6, characterized in that, The humidity-regulating composition comprises a hydrophilic polymer and a gel, which are molded into a humidity-regulating substrate.

9. A humidity control system for a sealed container, characterized in that, The sealed container humidity control system includes a sealed container containing nicotine products and a two-way humidity control pack as described in any one of claims 1 to 8, the amount of which is sufficient to maintain a preset constant water activity within a target temperature range and to slowly release and transfer moisture to the dry nicotine products at a controlled rate, so that the nicotine products return to the target value within a preset time after the sealed container is sealed.

10. The humidity control system for a sealed container according to claim 9, characterized in that, The preset water activity is 0.8-0.95, the target temperature range is 15-35℃, and the preset time is 1-7 days.

11. The humidity control system for a sealed container according to claim 9, characterized in that, The bidirectional humidity control pack is placed at the bottom of the sealed container or under the lid, so that the humidity control pack and the nicotine product form a stable convection and diffusion path.

12. The humidity control system for a sealed container according to claim 11, characterized in that, The bidirectional humidity control package includes a barrier layer and a moisture-permeable layer disposed opposite to each other. The humidity control substrate is disposed between the barrier layer and the moisture-permeable layer. The barrier layer is made of a low moisture-permeable and high-barrier material. The moisture-permeable layer is a moisture-permeable but liquid-permeable functional membrane. The outer side of the barrier layer is fixedly attached to the bottom of the sealed container or the inner side of the sealed container lid.

13. A preparation method, characterized in that, The method for preparing a two-way humidity control package as described in any one of claims 1 to 8 comprises the following steps: Prepare a humidity-regulating composition and form a humidity-regulating substrate; The packaging material comprises at least one moisture-permeable but liquid-impermeable functional membrane, wherein the moisture-permeable but liquid-impermeable functional membrane satisfies a water vapor permeability of 1000-3000 g·m at 25°C and 85% relative humidity. -2 ·d -1 ; The moisture-conditioning substrate is placed inside the packaging material and sealed.

14. The preparation method according to claim 13, characterized in that, The preparation method further includes the following steps: water activity calibration using a water activity meter; and determination of in-situ consistency and batch-to-batch consistency control using water activity, mass increment, and release curve.

15. A method for extending the shelf life of nicotine products, characterized in that, The method includes the following steps: Pack nicotine products with an initial moisture content lower than the target moisture content into sealed containers; A two-way humidity control pack as described in any one of claims 1 to 8 is arranged inside the container; Seal and store at 15-35℃ to allow the nicotine product to rehydrate to the target water content within 1-7 days, while maintaining the water activity in the container within the preset range of 0.8-0.95; During storage and circulation, the water activity is kept stable through the bidirectional humidity control function of the bidirectional humidity control package.

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