Hollow paper tube for improving moisture release uniformity of heated cigarette as well as preparation method and application of hollow paper tube

Abstract

The invention discloses a hollow paper tube for improving moisture release uniformity of a heated cigarette and a preparation method and application of the hollow paper tube, and belongs to the technical field of heated cigarette production. After the mixed wood pulp is mixed and pulped, a water locking functional material, a wet strength agent and filler are sequentially added for pulping, and composite pulp is obtained; forming, drying and slitting the composite slurry to obtain raw paper; and the body paper is spirally formed and rolled into a hollow paper tube. The hollow paper tube serving as a hollow cooling section of a heated cigarette can realize relative uniformity of puff-by-puff release amount of water in aerosol, can effectively solve the problems of dryness of smoke, relatively strong irritation and the like of a half section after the heated cigarette is smoked, improves the sensory quality of the heated cigarette, and is simple in preparation process, low in cost and relatively strong in operability.

Description

Technical Field

[0001] This invention relates to a hollow paper tube, particularly to a hollow paper tube that improves the uniformity of moisture release in heated cigarettes, and also to its application as a hollow cooling section in heated cigarettes, belonging to the field of heated tobacco. Background Technology

[0002] Unlike traditional cigarettes, heated cigarettes heat the entire cigarette during smoking. Therefore, the release of aroma compounds, nicotine, moisture, and atomizing agents is uneven to some extent. This manifests as a higher level of satisfaction in the first few puffs, followed by a decrease in satisfaction in the later puffs. Moisture accounts for up to 70% of the aerosol released in heated cigarettes. This uneven release of moisture leads to hot smoke in the first and second puffs, followed by dry smoke and increased irritation in the later puffs.

[0003] Currently, controlling the moisture release from heated cigarette tobacco segments is difficult. Chinese patent CN113367372B discloses a heated cigarette additive with a slow-release moisture function, its preparation method, and its application. The heated cigarette additive, by weight, comprises the following components: 21-26 parts propylene glycol, 41-47 parts glycerol, 10-16 parts alkali, 8-13 parts sodium polyacrylate, and 5-11 parts fucoidan, wherein the alkali is at least one of phosphorylcholine, sulfobetaine, or carboxybetaine. However, adding materials to heated cigarette tobacco segments may lead to unpleasant aromas during heating and smoking, affecting the sensory quality of the heated cigarette. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the first objective of this invention is to provide a hollow paper tube. Based on the fact that during the heating process of the tobacco segment of a heated cigarette, most of the moisture is trapped by the hollow cooling section due to condensation and deposition, and is in a dynamic equilibrium process, by adding a water-locking functional material to the paper tube in the hollow cooling section, the moisture content in the aerosol can be controlled more simply and effectively, targeting the water condensed and deposited on the inner wall of the paper tube, so as to achieve a relatively uniform release of moisture in the aerosol per breath.

[0005] The second objective of this invention is to provide a method for preparing hollow paper tubes, which is simple, low-cost, and conducive to industrial production.

[0006] The third objective of this invention is to provide an application of hollow paper tubes as hollow cooling sections in heated cigarettes. When hollow paper tubes with added water-locking functional materials in the base paper are used as hollow cooling sections in heated cigarettes, the relative uniformity of moisture release from the aerosol can be achieved with each puff. This can effectively solve problems such as dry smoke and strong irritation in the latter half of heated cigarette smoking, thereby improving the sensory quality of heated cigarettes.

[0007] To achieve the above-mentioned technical objectives, the present invention provides a method for preparing hollow paper tubes that improve the uniformity of moisture release in heated cigarettes. The method involves mixing and beating mixed wood pulp, then sequentially adding water-locking functional materials, wet strength agents, and fillers to obtain a composite pulp. The composite pulp is then formed, dried, and slit to obtain a base paper. The base paper is then spirally rolled into a hollow paper tube.

[0008] As a preferred embodiment, the mixed wood pulp comprises softwood pulp and hardwood pulp in a mass ratio of 4:6 to 5:5. The preferred mixed wood pulp, composed of softwood pulp and hardwood pulp in an appropriate proportion, can produce hollow paper tubes with the required hardness.

[0009] As a preferred embodiment, the degree of beating of the mixed pulp is 33°SR to 50°SR.

[0010] As a preferred embodiment, the water-locking functional material includes at least one of calcium sulfate, calcium chloride, silica gel, magnesium sulfate, and potassium carbonate. Preferred water-locking functional materials can form crystalline hydrates with water and still retain some water adsorption at relatively high temperatures; for example, calcium sulfate hydrate loses one molecule of water of crystallization at 128°C and all its water at 163°C; calcium chloride hydrate becomes dihydrate when heated to 200°C, and then becomes white porous anhydrous calcium chloride when heated to 260°C; silica gel typically loses water at around 200°C; magnesium sulfate hydrate loses 5 molecules of water of crystallization at 100°C, 6 molecules at 150°C, and all its water at 200°C; potassium carbonate hydrate loses water at approximately 100°C. These water-locking functional materials have good high-temperature water-locking capabilities, are safe and reliable, and are inexpensive, allowing them to be added during the papermaking process.

[0011] As a preferred embodiment, the amount of the water-locking functional material added is 10-25% of the mass of the mixed wood pulp. If the proportion of the water-locking functional material added is too low, its ability to regulate the moisture content in the aerosol is weak; if the amount added is too high, the paper retention rate is low, resulting in waste and affecting the performance indicators such as the hardness of the prepared paper tube.

[0012] As a preferred embodiment, the wet strength agent comprises polyamide epichlorohydrin resin.

[0013] As a preferred embodiment, the filler includes at least one of titanium dioxide, calcium carbonate, and kaolin.

[0014] As a preferred embodiment, the wet strength agent is added at a rate of 1 to 2% of the mass of the mixed wood pulp.

[0015] As a preferred embodiment, the filler is added at 10-15% of the mass of the mixed wood pulp. The wet strength agent and filler are conventional additives used in the papermaking process.

[0016] As a preferred embodiment, the drying process employs two sets of drying cylinders. In the first set of drying cylinders, the pressure of the rollers inside the cylinder is 80–100 kg / cm, the cylinder temperature is 110–130°C, and the drying time is 10–20 min. In the second set of drying cylinders, the pressure of the rollers inside the cylinder is 40–60 kg / cm, the cylinder temperature is 80–100°C, and the drying time is 20–30 min.

[0017] As a preferred embodiment, the hollow paper tube comprises an inner layer and an outer layer, wherein the basis weight of the inner layer is 100–200 g / m³. 2 The thickness is 0.2–0.3 mm, and the basis weight of the outer paper is 40–100 g / m². 2 The thickness is 0.1 to 0.2 mm.

[0018] This invention also provides a hollow paper tube for improving the uniformity of moisture release in heated cigarettes, obtained by the aforementioned preparation method. The hollow paper tube of this invention has a uniformly loaded water-locking functional material in its base paper. This is based on the fact that during the heating process of the tobacco segment of the heated cigarette, most of the moisture is trapped by the hollow cooling section due to condensation and deposition, and is in a dynamic equilibrium. The water-locking functional material in the hollow paper tube of the hollow cooling section can easily and effectively regulate the moisture content in the aerosol by utilizing the moisture condensed and deposited on the inner wall of the paper tube, thereby achieving a relatively uniform release of moisture from the aerosol with each puff.

[0019] This invention also provides an application of a hollow paper tube to improve the uniformity of moisture release in heated cigarettes, using it as a hollow cooling section in heated cigarettes. When the hollow paper tube with added water-locking functional materials in the base paper is used as a hollow cooling section in heated cigarettes, it can achieve a relatively uniform release of moisture from the aerosol with each puff, effectively solving problems such as dry smoke and strong irritation in the latter half of heated cigarette smoking, and improving the sensory quality of heated cigarettes.

[0020] Compared with the prior art, the beneficial technical effects of this invention are as follows:

[0021] Existing technologies primarily regulate the moisture content of aerosols by adding functional materials to the tobacco segments of heated cigarettes. This can lead to unpleasant odors during the heating and inhalation process, affecting the sensory quality of heated cigarettes. In contrast, this invention introduces a water-locking functional material into the hollow paper tube of the hollow cooling section, enabling a simpler and more effective control of the moisture content in the aerosol, thus achieving a relatively uniform release of moisture from the aerosol with each puff. Attached Figure Description

[0022] Figure 1Thermogravimetric analysis was performed on the paper tube base paper prepared for Example 1 and Comparative Example 1. Detailed Implementation

[0023] The embodiments of this invention are intended to illustrate the invention and not to further limit the scope of protection of the claims of this invention.

[0024] To verify the actual effect of the present invention, a certain amount of water was sprayed onto the surface of the paper tube base paper of Example 1 and Comparative Example 1. After the paper absorbed the water, a thermogravimetric analysis experiment was conducted. The experimental results are as follows: Figure 1 As shown in the figure, the results indicate that the water-locking treatment slowed down the rate of water loss in the paper, delaying the complete evaporation of moisture by approximately 2 minutes.

[0025] Unless otherwise specified, the chemical materials used in the following specific embodiments are all conventional commercially available reagents.

[0026] Example 1

[0027] The base paper for hollow paper tubes is made from mixed wood pulp (softwood pulp and hardwood pulp in a 5:5 mass ratio), which is then mixed and beaten (beating degree 50°SR). Water-locking functional material (calcium chloride, 20% of the mixed wood pulp mass), wet strength agent (polyamide epichlorohydrin resin, 2% of the mixed wood pulp mass), and filler (kaolin, 10% of the mixed wood pulp mass) are added sequentially to obtain a composite pulp. This composite pulp is then formed and dried (using two sets of drying cylinders). The paper tubes are dried in two stages: the first set of drying cylinders has an inner roller pressure of 100 kg / cm, a cylinder temperature of 130°C, and a drying time of 20 min; the second set of drying cylinders has an inner roller pressure of 60 kg / cm, a cylinder temperature of 100°C, and a drying time of 30 min. After slitting, hollow paper tube base paper is obtained. The paper tubes are then spirally rolled into hollow paper tubes (the paper tubes consist of an inner layer and an outer layer, with the inner layer having a basis weight of 180 g / m²). 2 The thickness is 0.3mm, and the basis weight of the outer paper tube is 40g / m². 2 (The thickness is 0.1mm).

[0028] After preparing hollow paper tubes, heated cigarettes were rolled using conventional methods. A rotary smoking machine was used to puff through each heated cigarette, and the amount of moisture released from the Cambridge filter trap was measured for each puff. The moisture detection method employed gas chromatography-mass spectrometry, as detailed below. The results are shown in Table 1.

[0029] Moisture content was determined according to the method in YC / T 345—2010. The obtained filter was placed in a 50 mL Erlenmeyer flask, and 10 mL of methanol containing 5.0 mg / mL isopropanol as an internal standard was added. After shaking and extraction for 30 min, 1 mL of the extract was transferred to a chromatographic bottle and detected by a gas chromatograph equipped with a thermal conductivity detector (TCD).

[0030] Gas chromatography parameters: Column: HP-PLOT / Q, dimensions: 30m (length) × 530μm (inner diameter) × 40μm (film thickness); Temperature program: initial temperature 75℃, increased to 250℃ at 10℃ / min, held for 10min; Injector temperature: 200℃, splitless injection; Detector temperature: 250℃; Helium reference flow rate: 10mL / min; Carrier gas: Helium, flow rate: 7.5mL / min; Injection volume: 1μL.

[0031] Example 2

[0032] The base paper for hollow paper tubes is made from mixed wood pulp (softwood pulp and hardwood pulp in a 5:5 mass ratio), which is then mixed and beaten (beating degree 33°SR). Water-locking functional material (calcium sulfate, added at 15% of the mixed wood pulp mass), wet strength agent (polyamide epichlorohydrin resin, added at 2% of the mixed wood pulp mass), and filler (titanium dioxide, added at 15% of the mixed wood pulp mass) are added sequentially. This process continues pulping to obtain a composite pulp. The composite pulp is then formed and dried (using two sets of drying cylinders). The material is dried, with the first set of drying cylinders having an inner roller pressure of 80 kg / cm, a cylinder temperature of 110°C, and a drying time of 20 min; the second set of drying cylinders has an inner roller pressure of 60 kg / cm, a cylinder temperature of 100°C, and a drying time of 30 min. After slitting, hollow paper tube base paper is obtained. This paper tube is then spirally rolled into hollow paper tubes (the paper tube includes an inner layer and an outer layer, with the inner layer having a basis weight of 100 g / m²). 2 The thickness is 0.2mm, and the basis weight of the outer paper tube is 40g / m². 2 (The thickness is 0.1mm).

[0033] After preparing hollow paper tubes, heated cigarettes were rolled using conventional methods. A rotary smoking machine was used to puff through each heated cigarette, and the amount of moisture released from the Cambridge filter trap was measured for each puff. The moisture detection method employed gas chromatography-mass spectrometry, as detailed below. The results are shown in Table 1.

[0034] Moisture content was determined according to the method in YC / T 345—2010. The obtained filter was placed in a 50 mL Erlenmeyer flask, and 10 mL of methanol containing 5.0 mg / mL isopropanol as an internal standard was added. After shaking and extraction for 30 min, 1 mL of the extract was transferred to a chromatographic bottle and detected by a gas chromatograph equipped with a thermal conductivity detector (TCD).

[0035] Gas chromatography parameters: Column: HP-PLOT / Q, dimensions: 30m (length) × 530μm (inner diameter) × 40μm (film thickness); Temperature program: initial temperature 75℃, increased to 250℃ at 10℃ / min, held for 10min; Injector temperature: 200℃, splitless injection; Detector temperature: 250℃; Helium reference flow rate: 10mL / min; Carrier gas: Helium, flow rate: 7.5mL / min; Injection volume: 1μL.

[0036] Example 3

[0037] The base paper for hollow paper tubes is made from mixed wood pulp (softwood pulp and hardwood pulp in a mass ratio of 4:6), which is then mixed and beaten (beating degree 40°SR). Water-locking functional material (silicone, added at 20% of the mixed wood pulp mass), wet strength agent (polyamide epichlorohydrin resin, added at 2% of the mixed wood pulp mass), and filler (calcium carbonate, added at 15% of the mixed wood pulp mass) are added sequentially to continue pulping, resulting in a composite pulp. This composite pulp is then formed and dried (using two sets of drying cylinders). The paper tubes are dried in the following manner: the pressure of the rollers inside the first set of drying cylinders is 90 kg / cm, the temperature of the drying cylinder is 120℃, and the drying time is 15 min; the pressure of the rollers inside the second set of drying cylinders is 50 kg / cm, the temperature of the drying cylinder is 90℃, and the drying time is 25 min. After slitting, hollow paper tube base paper is obtained. The paper tube paper is then spirally rolled into hollow paper tubes (the paper tube paper includes an inner layer of paper tube paper and an outer layer of paper tube paper, the basis weight of the inner layer of paper tube paper is 150 g / m²). 2 The thickness is 0.3mm, and the basis weight of the outer paper tube is 60g / m². 2 (The thickness is 0.1mm).

[0038] After preparing hollow paper tubes, heated cigarettes were rolled using conventional methods. A rotary smoking machine was used to puff through each heated cigarette, and the amount of moisture released from the Cambridge filter trap was measured for each puff. The moisture detection method employed gas chromatography-mass spectrometry, as detailed below. The results are shown in Table 1.

[0039] Moisture content was determined according to the method in YC / T 345—2010. The obtained filter was placed in a 50 mL Erlenmeyer flask, and 10 mL of methanol containing 5.0 mg / mL isopropanol as an internal standard was added. After shaking and extraction for 30 min, 1 mL of the extract was transferred to a chromatographic bottle and detected by a gas chromatograph equipped with a thermal conductivity detector (TCD).

[0040] Gas chromatography parameters: Column: HP-PLOT / Q, dimensions: 30m (length) × 530μm (inner diameter) × 40μm (film thickness); Temperature program: initial temperature 75℃, increased to 250℃ at 10℃ / min, held for 10min; Injector temperature: 200℃, splitless injection; Detector temperature: 250℃; Helium reference flow rate: 10mL / min; Carrier gas: Helium, flow rate: 7.5mL / min; Injection volume: 1μL.

[0041] Comparative Example 1

[0042] The difference from Example 1 is that no water-locking functional material was added to the hollow paper tube. The test results are shown in Table 1.

[0043] Comparative Example 2

[0044] The difference from Example 1 is that the water-locking functional material used is superabsorbent polymer (SAP), and the test results are shown in Table 1.

[0045] Table 1. Results of moisture release from heated cigarettes in Example 1 and Comparative Example 1 (by puff).

[0046] Suction port sequence Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 First bite 0.29 0.31 0.32 0.34 0.30 Second bite 0.37 0.38 0.39 0.32 0.28 The third bite 0.37 0.42 0.43 0.52 0.55 Fourth bite 0.32 0.36 0.48 0.66 0.59 Fifth 0.31 0.31 0.34 0.21 0.38 Sixth mouth 0.29 0.25 0.25 0.12 0.23 Total amount / mg 1.95 2.03 2.21 2.17 2.34 Relative standard deviation 11.14％ 17.87％ 22.35％ 55.19％ 38.73％

Claims

1. A method for preparing a hollow paper tube that improves the uniformity of moisture release in heated cigarettes, characterized in that: After mixing and beating the mixed wood pulp, water-locking functional materials, wet strength agents and fillers are added in sequence to make a composite pulp. The composite pulp is then formed, dried and slit to obtain base paper. The base paper is then spirally rolled into hollow paper tubes.

2. The method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1, characterized in that: The mixed wood pulp includes softwood pulp and hardwood pulp in a mass ratio of 4:6 to 5:

5.

3. A method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1 or 2, characterized in that: The beating degree of the mixed pulp is 33°SR to 50°SR.

4. The method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1, characterized in that: The water-locking functional material includes at least one of calcium sulfate, calcium chloride, silica gel, magnesium sulfate, and potassium carbonate.

5. A method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1 or 4, characterized in that: The amount of the water-locking functional material added is 10-25% of the mass of the mixed wood pulp.

6. The method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1, characterized in that: The wet strength agent includes polyamide epichlorohydrin resin; The filler includes at least one of titanium dioxide, calcium carbonate, and kaolin. The amount of wet strength agent added is 1-2% of the mass of the mixed wood pulp; The amount of filler added is 10-15% of the mass of the mixed wood pulp.

7. The method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1, characterized in that: The drying process employs two sets of drying cylinders. In the first set of drying cylinders, the pressure of the rollers inside the cylinder is 80–100 kg / cm, the cylinder temperature is 110–130°C, and the drying time is 10–20 min. In the second set of drying cylinders, the pressure of the rollers inside the cylinder is 40–60 kg / cm, the cylinder temperature is 80–100°C, and the drying time is 20–30 min.

8. The method for preparing a hollow paper tube for improving the uniformity of moisture release in heated cigarettes according to claim 1, characterized in that: The hollow paper tube comprises an inner layer and an outer layer, with the inner layer having a basis weight of 100–200 g / m³. 2 The thickness is 0.2–0.3 mm, and the basis weight of the outer paper is 40–100 g / m². 2 The thickness is 0.1 to 0.2 mm.

9. A hollow paper tube for improving the uniformity of moisture release in heated cigarettes, characterized in that: It is obtained by the preparation method described in any one of claims 1 to 8.

10. The application of the hollow paper tube for improving the uniformity of moisture release in heated cigarettes as described in claim 9, characterized in that: It is used as a hollow cooling section for heating cigarettes.

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