Tipping paper for thermochromic cigarette and production process of tipping paper

Abstract

The invention discloses tipping paper for a thermochromic cigarette. The tipping paper comprises 10-20 parts of a microencapsulated thermosensitive natural pigment; 50-70 parts of an Arabic gum solution; 10 to 30 parts of glycerol; 0.2 to 0.8 part of vitamin E; and 4-5 parts of absolute ethyl alcohol. The food-grade heat-sensitive pigment and the natural anthocyanin are mixed, the color-changing pigment is prepared by adopting a microencapsulation process, then the Arabic gum solution, the glycerinum, the vitamin E and the absolute ethyl alcohol are mixed to prepare the food-grade heat-induced acid-base color-changing ink, the color is changed through temperature and acid-base changes, and the ink is safe, environmentally friendly and reliable; in the field of tipping paper for cigarettes, the appearance personality and the anti-counterfeiting requirement of the packaging paper can be enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of cigarette tipping paper, and specifically relates to a temperature-sensitive color-changing cigarette tipping paper and its production process. Background Art

[0002] Ink is an important material for printing on packaging materials. Through printing, patterns and texts are presented on the printing substrate. Ink includes main components and auxiliary components, which are evenly mixed and repeatedly rolled into a viscous colloidal fluid. With the development of the tobacco industry, the demand for cigarette tipping paper increases, thus promoting the increase in the market demand for packaging ink.

[0003] In the prior art, ink is applied to cigarette tipping paper. However, during the suction process of the cigarette after being wrapped with the cigarette tipping paper, it cannot be affected by the temperature of the smoke, so that the color of the ink on its surface does not change, resulting in the failure to achieve the color-changing effect, low practicality of the cigarette tipping paper product, and inability to play the role of decoration and anti-counterfeiting. In addition, for the use environment of cigarette tipping paper, such ink may ensure direct contact with food. At the same time, compared with the need for a dark background to show its characteristics, it also needs to be applicable to a white background to ensure no negative impact on the color-changing effect.

[0004] Therefore, there is an urgent need for a safe and practical color-changing ink and its production process for cigarette tipping paper. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a temperature-sensitive color-changing cigarette tipping paper and its production process, avoiding the troubles of the lack of ink color-changing effect, inability to directly contact food, and weak anti-counterfeiting property in the previous cigarette tipping paper.

[0006] To solve the above technical problem, the present invention discloses a temperature-sensitive color-changing cigarette tipping paper, including: 10 - 20 parts of microencapsulated thermosensitive natural pigment; 50 - 70 parts of gum arabic solution; 10 - 30 parts of glycerol; 0.2 - 0.8 part of vitamin E; 4 - 5 parts of absolute ethanol.

[0007] According to an embodiment of the present invention, the above includes by weight: 15 parts of microencapsulated thermosensitive natural pigment; 60 parts of gum arabic solution; 20 parts of glycerol; 0.5 part of vitamin E; 4.5 parts of absolute ethanol.

[0008] The present invention also discloses a temperature-sensitive color-changing cigarette tipping paper and its production process, including: Step a. Raw material pretreatment: Provide cholesteric liquid crystal material recrystallized with ethanol, and filter it through a 0.22 μm food-grade filter membrane to obtain a thermosensitive pigment; Provide ultrasonic-assisted water extraction of blueberry pomace, concentrate it and then freeze-dry it to obtain natural anthocyanins. Mix the two in a ratio of 1:1 to obtain a thermosensitive natural pigment; Step b. Microencapsulation process Step b1. Provide wall materials: gum arabic + maltodextrin, mix the two in a ratio of 3:1; Core materials: thermosensitive natural pigment + glycerol, plasticize the two in a ratio of 1:1; Step b2. Emulsification: Homogenize the core material and the wall material in a 60°C water bath to form an O / W emulsion; Step b3. Spray drying: Use a spray dryer for treatment, with an inlet temperature of 160°C and an outlet temperature of 80°C; Control the particle size to 5 - 20 μm to obtain microencapsulated pigment; Step b4. Coating detection: Confirm the integrity of the microcapsules through a scanning electron microscope; Step c. Mix the gum arabic solution and glycerol in a stirring tank, slowly add the microencapsulated pigment, reduce the stirring rate to 200 rpm, and add vitamin E; Adjust to 15 - 100 cP with anhydrous ethanol; Step d. Disperse with a three-roll grinder 2 - 3 times to eliminate agglomeration and obtain color-changing ink; Step e. Print the cigarette tipping base paper at a machine speed of 150 - 250 m / min with a printing screen roller of 60 - 80 lines, and print the color layer ink. The ink quantity per layer of the color layer ink is 0.1 - 2.0 g / m2; Step f. After the color layer ink is printed, continue to print the color-changing ink at a machine speed of 150 - 250 m / min; Step g. Continue to dry at a machine speed of 150 - 250 m / min under the condition of a temperature of 45 - 100°C; Step h. Continue to feed it into a hot stamping machine at a machine speed of 150 - 250 m / min and perform one-color hot stamping on the hot stamping machine; Step i. Slit and store in the warehouse.

[0009] According to an embodiment of the present invention, in the above step b2, the homogenization stirring speed is 10000 rpm and the time is 15 min.

[0010] According to an embodiment of the present invention, in the above step c, vitamin E is dissolved in a small amount of ethanol and then added dropwise, and the ethanol content is 50 ml.

[0011] According to an embodiment of the present invention, the chromatic layer ink is 1 - 4 layers; the color-changing ink is 2 - 6 layers, and the ink dosage per layer is 0.5 - 3.0 g / m2.

[0012] According to an embodiment of the present invention, the base paper of the cigarette tipping paper is selected from one of ordinary type, silver-white transfer type, transparent type, high-gloss type, laser type, and direct plating type tipping paper.

[0013] Compared with the prior art, the present invention can achieve the following technical effects: By using microencapsulated thermosensitive natural pigments as the main body of the color-changing ink, and mixing gum arabic solution, glycerol, vitamin E, and absolute ethanol, a food-grade thermo-induced acid-base color-changing ink is prepared. The color is changed by temperature and acid-base changes, which is safe, environmentally friendly and reliable, and can enhance the appearance personality and anti-counterfeiting requirements of the packaging paper in the field of cigarette tipping paper.

[0014] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned technical effects simultaneously. Specific Embodiments

[0015] The following will detail the embodiments of the present invention in conjunction with examples, so as to fully understand how the present invention applies technical means to solve technical problems and achieve the realization process of technical effects, and implement accordingly.

[0016] The present invention discloses a temperature-sensitive color-changing cigarette tipping paper, comprising: 10 - 20 parts of microencapsulated thermosensitive natural pigments; 50 - 70 parts of gum arabic solution; 10 - 30 parts of glycerol; 0.2 - 0.8 part of vitamin E; 4 - 5 parts of absolute ethanol.

[0017] Among them, the microencapsulated thermosensitive natural pigment uses food-grade thermosensitive pigments, such as microencapsulated cholesteric liquid crystals, with a temperature resistance range of 0°C to 60°C, and natural anthocyanins (blueberry / purple cabbage extracts), with a pH-sensitive range of 3 - 9. They are mixed to change color through temperature changes and acid-base discoloration. The main components of cigarettes are carbon monoxide, nicotine, nicotine, tobacco oil, and some other gases and components. Carbon monoxide and nicotine are neutral, tobacco oil is weakly acidic, but nicotine is strongly alkaline. During the combustion process, the pH value will change, so it will react with natural anthocyanins, changing from pink at acidic pH to yellow at neutral pH, and can further react and transform in combination with the changes of the thermosensitive pigment at this time. Gum arabic solution is an edible binder to improve film-forming properties. Vitamin E is used to prevent pigment oxidation. Glycerol is a plasticizer to maintain flexibility, and absolute ethanol is a solvent to adjust viscosity. The pigment microcapsules have no migration risk and can prevent infiltration into food. And the substrate is a natural polysaccharide, which can be environmentally degraded. Example 1

[0018] Provide 15 parts of microencapsulated thermosensitive natural pigment; 60 parts of gum arabic solution; 20 parts of glycerol; 0.5 part of vitamin E; 4.5 parts of absolute ethanol.

[0019] Step a. Raw material pretreatment: Provide cholesteric liquid crystal material recrystallized with ethanol and filtered through a 0.22μm food-grade filter membrane to obtain thermosensitive pigment; Provide ultrasonic-assisted water extraction of blueberry residue, concentrate and freeze-dry to obtain natural anthocyanins. The anthocyanin formula needs to maintain pH = 4 - 6 (to avoid premature triggering of color change). The two are mixed in a ratio of 1:1 to obtain thermosensitive natural pigment, which can sense temperature and change color due to acid-base.

[0020] Step b. Microencapsulation process Step b1. Provide wall materials: Gum arabic + maltodextrin, mixed in a ratio of 3:1; Core materials: Thermosensitive natural pigment + glycerol, plasticized in a ratio of 1:1; Step b2. Emulsification: Homogenize the core material and the wall material in a 60°C water bath to form an O / W emulsion; Step b3. Spray drying: Use a spray dryer for treatment, with an inlet temperature of 160°C and an outlet temperature of 80°C to avoid inactivation of thermosensitive materials; Control the particle size at 5 - 20μm to avoid affecting printing accuracy and color change sensitivity, and obtain microencapsulated pigment; Step b4. Coating detection: Confirm the integrity of the microcapsules through scanning electron microscopy; Step c. Mix the gum arabic solution (40% solids content) and glycerol in a stirring tank (500 rpm, 25°C), slowly add the microencapsulated pigment, avoiding shear force damage, reduce the stirring rate to 200 rpm, and add vitamin E; adjust to 15 - 100 cP with absolute ethanol; among which 15 - 20 cP (suitable for inkjet printing) or 50 - 100 cP (suitable for screen printing).

[0021] Step d. Disperse 2 - 3 times using a three - roll mill (gap ≤ 10μm) to eliminate agglomeration and obtain the color - changing ink; Step e. Print the ink for the color layer on the tipping base paper for cigarettes at a machine speed of 150 - 250 m / min with a printing screen roller of 60 - 80 lines, and the ink dosage of the color - layer ink is 0.1 - 2.0 g / m2 per layer; Step f. After printing the color - layer ink, continue to print the color - changing ink at a machine speed of 150 - 250 m / min; Step g. Continue to dry at a machine speed of 150 - 250 m / min under the condition of a temperature of 45 - 100°C; Step h. Continue to feed into a hot stamping machine at a machine speed of 150 - 250 m / min and perform single - color hot stamping on the hot stamping machine; Step i. Cut and store in the warehouse. Example 2

[0022] Provide 10 parts of microencapsulated thermosensitive natural pigment; 50 parts of gum arabic solution; 10 parts of glycerol; 0.2 part of vitamin E; 4 parts of absolute ethanol.

[0023] Step a. Pretreat the raw materials. Provide the cholesteric liquid crystal material recrystallized with ethanol and filter it through a 0.22μm food - grade filter membrane to obtain the thermosensitive pigment; provide ultrasonic - assisted water extraction of blueberry pomace, concentrate it and then freeze - dry to obtain natural anthocyanins, and mix the two in a ratio of 1:1 to obtain the thermosensitive natural pigment; Step b. Microencapsulation process Step b1. Provide the wall material: gum arabic + maltodextrin, mixed in a ratio of 3:1; the core material: thermosensitive natural pigment + glycerol, plasticized in a ratio of 1:1; Step b2. Emulsification: Homogenize the core material and the wall material in a 60°C water bath to form an O / W emulsion; Step b3. Spray drying: Process with a spray dryer, inlet temperature 160°C, outlet temperature 80°C; control the particle size to 5 - 20μm to obtain the microencapsulated pigment; Step b4. Coating detection: Confirm the integrity of the microcapsules through scanning electron microscopy; Step c. Mix the gum arabic solution and glycerol in a stirring tank, slowly add the microencapsulated pigment, reduce the stirring rate to 200 rpm, and add vitamin E; adjust to 15 - 100 cP with absolute ethanol; Step d. Disperse with a three - roll mill 2 - 3 times to eliminate agglomeration and obtain the color - changing ink; Step e. Print the tipping base paper for cigarettes at a machine speed of 150 - 250 m / min with a printing screen roller of 60 - 80 lines, and print the color layer ink. The ink dosage of the color layer ink is 0.1 - 2.0 g / m² per layer; Step f. After the color layer ink is printed, continue to print the color - changing ink at a machine speed of 150 - 250 m / min; Step g. Continue to dry at a machine speed of 150 - 250 m / min under the condition of a temperature of 45 - 100 °C; Step h. Continue to feed into a hot stamping machine at a machine speed of 150 - 250 m / min and perform single - color hot stamping on the hot stamping machine; Step i. Slit and store in the warehouse. Example 3

[0024] Provide 20 parts of microencapsulated thermosensitive natural pigment; 70 parts of gum arabic solution; 30 parts of glycerol; 0.8 part of vitamin E; 5 parts of absolute ethanol.

[0025] Step a. Pretreat the raw materials. Provide the cholesteric liquid crystal material recrystallized with ethanol and filter it with a 0.22 - μm food - grade filter membrane to obtain the thermosensitive pigment; provide ultrasonic - assisted water extraction of blueberry pomace, concentrate and then freeze - dry to obtain natural anthocyanins, and mix the two in a ratio of 1:1 to obtain the thermosensitive natural pigment; Step b. Microencapsulation process Step b1. Provide the wall material: gum arabic + maltodextrin, and mix the two in a ratio of 3:1; core material: thermosensitive natural pigment + glycerol, and plasticize the two in a ratio of 1:1; Step b2. Emulsification: Homogenize the core material and the wall material in a 60 °C water bath to form an O / W emulsion; Step b3. Spray drying: Process with a spray dryer, with an inlet temperature of 160 °C and an outlet temperature of 80 °C; control the particle size at 5 - 20 μm to obtain the microencapsulated pigment; Step b4. Coating detection: Confirm the integrity of the microcapsules by scanning electron microscopy; Step c. Mix the gum arabic solution and glycerol in a stirring tank, slowly add the microencapsulated pigment, reduce the stirring rate to 200 rpm, and add vitamin E; adjust to 15 - 100 cP with absolute ethanol; Step d. Disperse with a three - roll mill 2 - 3 times to eliminate agglomeration and obtain the color - changing ink; Step e. Feed the cigarette tipping base paper at a machine speed of 150 - 250 m / min, with a printing screen roller of 60 - 80 lines, and print the color layer ink. The ink dosage of the color layer ink is 0.1 - 2.0 g / m² per layer. Step f. After the color layer ink printing is completed, continue to print the color-changing ink at a machine speed of 150 - 250 m / min. Step g. Continue to dry at a machine speed of 150 - 250 m / min under the condition of a temperature of 45 - 100 °C. Step h. Continue to feed into a hot stamping machine at a machine speed of 150 - 250 m / min and perform one-color hot stamping on the hot stamping machine. Step i. Cut and store in the warehouse.

[0026] After testing the color-changing sensitivity in accordance with GB / T 30768 - 2014, ΔE≥5 (after temperature / pH change) in Examples 1 - 3. After testing the migration amount in accordance with GB 31604.8 - 2021, the heavy metals in Examples 1 - 3 are < 0.01 mg / kg; by testing the viscosity stability with a rotational viscometer (25 °C, 48 h), the fluctuation in Examples 1 - 3 is < ±5%; by testing the microbial quantity in accordance with GB 4789.2 - 2016, the total number of colonies in Examples 1 - 3 is ≤100 CFU / g. Among them, Example 1 is the most obvious in terms of color-changing sensitivity and has high visual recognition.

[0027] The homogenization stirring speed in the above step b2 is 10000 rpm and the time is 15 min.

[0028] In step c, vitamin E is dissolved in a small amount of ethanol and then dropped. The ethanol content is 50 ml to facilitate providing an antioxidant effect.

[0029] The color layer ink is 1 - 4 layers; the color-changing ink is 2 - 6 layers, and the ink dosage per layer is 0.5 - 3.0 g / m² to ensure sufficient color-changing recognition.

[0030] The cigarette tipping paper base is selected from one of the ordinary type, silver-white transfer type, transparent type, high-gloss type, laser type, and direct plating type tipping papers, with wide applicability.

[0031] In summary, the present invention uses microencapsulated thermosensitive natural pigments as the main body of the color-changing ink, and mixes gum arabic solution, glycerol, vitamin E, and absolute ethanol to prepare a food-grade thermally induced acid-base color-changing ink. The color is changed by temperature and acid-base changes, which is safe, environmentally friendly, and reliable. It can enhance the appearance personality and anti-counterfeiting requirements of packaging paper in the field of cigarette tipping paper.

[0032] The foregoing description has shown and described several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but 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 above teachings or the skills or knowledge in the relevant field. Any alterations and changes made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A temperature-sensitive color-changing tipping paper for cigarettes, characterized in that, By weight parts, it includes: 10 - 20 parts of microencapsulated thermosensitive natural pigment; 50 - 70 parts of gum arabic solution; 10 - 30 parts of glycerol; 0.2 - 0.8 part of vitamin E; 4 - 5 parts of absolute ethanol.

2. The temperature-sensitive color-changing tipping paper for cigarettes according to claim 1, wherein By weight parts, it includes: 15 parts of microencapsulated thermosensitive natural pigment; 60 parts of gum arabic solution; 20 parts of glycerol; 0.5 part of vitamin E; 4.5 parts of absolute ethanol.

3. A production process of temperature-sensitive discoloring tipping paper for cigarettes as described in claim 2, characterized in that, It includes: Step a. Raw material pretreatment: Provide cholesteric liquid crystal material, recrystallize it with ethanol, and filter it through a 0.22 μm food-grade filter membrane to obtain thermosensitive pigment; Provide ultrasonic-assisted water extraction of blueberry residue, concentrate it and then freeze-dry to obtain natural anthocyanin, and mix the two in a ratio of 1:1 to obtain thermosensitive natural pigment; Step b. Microencapsulation process Step b1. Provide wall materials: Gum arabic + maltodextrin, and mix the two in a ratio of 3:1; Core material: Thermosensitive natural pigment + glycerol, and plasticize the two in a ratio of 1:1; Step b2. Emulsification: Homogenize the core material and the wall material in a 60°C water bath to form an O / W emulsion; Step b3. Spray drying: Use a spray dryer for treatment, with an inlet temperature of 160°C and an outlet temperature of 80°C; Control the particle size at 5 - 20 μm to obtain microencapsulated pigment; Step b4. Coating detection: Confirm the integrity of the microcapsules through a scanning electron microscope; Step c. Mix the gum arabic solution and glycerol in a stirring tank, slowly add the microencapsulated pigment, reduce the stirring rate to 200 rpm, and add vitamin E; Adjust it to 15 - 100 cP with absolute ethanol; Step d. Disperse it 2 - 3 times with a three-roll grinder to eliminate agglomeration and obtain color-changing ink; Step e. Print the cigarette tipping base paper at a machine speed of 150 - 250 m / min with a printing screen roller of 60 - 80 lines, and print the color layer ink, with the ink dosage per layer of the color layer ink being 0.1 - 2.0 g / m2; Step f. After the color layer ink is printed, continue to print the color-changing ink at a machine speed of 150 - 250 m / min; Step g. Continue to dry it at a machine speed of 150 - 250 m / min under the condition of a temperature of 45 - 100°C; Step h. Continue to feed it into a hot stamping machine at a machine speed of 150 - 250 m / min and perform single-color hot stamping on the hot stamping machine; Step i. Cut and store in warehouse.

4. The temperature-sensitive color-changing cigarette tipping paper production process according to claim 3, characterized in that, Among them, in the said step b2, the homogenization stirring speed is 10000 rpm and the time is 15 min.

5. The production process of the temperature-sensitive color-changing tipping paper for cigarettes according to claim 3, characterized in that, Among them, in the said step c, vitamin E is dissolved in a small amount of ethanol and then added dropwise, and the ethanol content is 50 ml.

6. The production process of the temperature-sensitive color-changing tipping paper for cigarettes according to claim 3, characterized in that, Among them, the said color layer ink is 1 - 4 layers; The color-changing ink is 2 - 6 layers, and the ink dosage per layer is 0.5 - 3.0 g / m2.

7. The production process of the temperature-sensitive color-changing tipping paper for cigarettes according to claim 3, characterized in that, Among them, the cigarette tipping base paper is selected from one of the ordinary type, silver-white transfer type, transparent type, high-gloss type, laser type, and direct plating type tipping papers.