A banded cigar wrapper and method of making the same

Abstract

The application relates to the technical field of cigar technology, in particular to a cigar wrapper with lines and a preparation method thereof. The preparation method comprises the following steps: S1. selecting discarded tobacco leaf main veins, fixing the discarded tobacco leaf main veins on a bottom plate to form a pressing template; S2. placing tobacco leaves on the pressing template, the part of the tobacco leaves in contact with the discarded tobacco leaf main veins forming a to-be-pressed line part, and the remaining part forming a non-pressed line part; S3. carrying out moisture conditioning on the tobacco leaves; and S4. carrying out pressing treatment on the tobacco leaves, so that the to-be-pressed line part is pressed under the action of the discarded tobacco leaf main veins. The discarded tobacco leaf main veins are used as a template to form lines on the tobacco leaves, the natural and clear lines are obtained, the smoking taste of the cigar is not affected, and the discarded tobacco leaf main veins are reused.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigar, in particular to a kind of cigar jacket with lines and preparation method thereof. BACKGROUND

[0002] From the structure, a complete cigar is composed of cigar core, cigar sleeve and cigar jacket, wherein the cigar jacket tobacco leaf is located at the outermost layer of cigar, and it is the most expensive tobacco leaf, the quality of which determines the appearance of cigar, and it not only affects the judgment of consumers on the aroma and density of cigar product, but also represents the identity of a cigar.

[0003] With the development of society, cigar consumption gradually becomes a trend, and the growth rate of cigar consumption population and consumption volume is more than 40% according to the data over the years. While the market expands, consumers also put forward higher requirements for the richness of cigar product categories. Domestic cigar development started relatively late, and compared with foreign cigar products, the difference between domestic cigar products is not obvious except for the shape and specifications of the cigarette. Foreign cigar has a long history, and the processing technology of cigar tobacco leaf is relatively mature, such as color jacket, Maduro jacket, green jacket, etc. However, the core technology involved in its production has been kept secret for a long time. How to meet the market demand for the richness of cigar product categories through special process, break through the technical blockade, and improve the recognition and value of products is of great significance to the high-quality development of domestic cigar.

[0004] At present, in the research on cigar jacket with lines, paper-based material with lines is mostly used to replace cigar tobacco leaf as cigar jacket, such as the patent document with publication number CN104480774A, which discloses a preparation process of cigar jacket and cigar sleeve with tobacco texture, which includes the following steps: tobacco raw material is made into tobacco extract; combustion improver, humectant and coloring agent for tobacco are added to the tobacco extract to obtain tobacco coating liquid; tobacco pulp is obtained by extruding tobacco raw material; additional commercial wood pulp fiber is beaten to obtain additional fiber pulp; the tobacco pulp is mixed into the additional fiber pulp; calcium carbonate is added to the mixed pulp; one or more of sugarcane residue coarse fiber, tobacco stem coarse fiber and corn silk coarse fiber are added to the mixed pulp to obtain pre-pulping pulp; the pre-pulping pulp is formed into paper base; the tobacco coating liquid is applied to the paper base to form the cigar jacket and cigar sleeve with tobacco texture. This method not only simulates the lines unnaturally, but also affects the smoking taste of cigar, so that the outer appearance and internal taste of cigar are defective. SUMMARY

[0005] The present application solves the above problems, and provides a kind of cigar jacket with lines and preparation method thereof, which is natural and does not affect the smoking taste.

[0006] The technical scheme for solving the problem of the present application is to first provide a preparation method of a cigar wrapper with a pattern, comprising the following steps:

[0007] S1. Selecting a discarded tobacco leaf main vein, fixing the discarded tobacco leaf main vein on a bottom plate to form a pressing template;

[0008] S2. Placing the tobacco leaf on the pressing template, the part of the tobacco leaf in contact with the discarded tobacco leaf main vein forming a part to be pressed, and the remaining part forming a non-pressed part;

[0009] S3. Moistening the tobacco leaf;

[0010] S4. Pressing the tobacco leaf, so that the part to be pressed is pressed under the action of the discarded tobacco leaf main vein.

[0011] In the present application, the discarded tobacco leaf main vein protrudes from the surface of the bottom plate. After the tobacco leaf to be pressed is placed on the discarded tobacco leaf main vein, a part of the tobacco leaf is in contact with the discarded tobacco leaf main vein to form a part to be pressed, and the remaining part of the tobacco leaf is not supported at the bottom and hangs in the air on the bottom plate to form a non-pressed part. Based on this, when the tobacco leaf is pressed, the cells of the part to be pressed are broken under the action of the discarded tobacco leaf main vein, and the free water in the tobacco leaf tissue carries a part of the organic matter in the tobacco leaf to the surface of the tobacco leaf, and is oxidized and condensed into a brown position; the non-pressed part does not have a supporting structure at the bottom, so even if the top is pressed, it will not directly cause the cells to break, thereby maintaining the original state; thus, a color difference is generated between the part to be pressed and the non-pressed part of the tobacco leaf, and a cigar wrapper with a pattern is obtained. In which, the discarded tobacco leaf main vein is selected as the pattern template for pressing, not only realizing the reuse of waste materials in the production process, but also the uneven pattern on the surface of the discarded tobacco leaf main vein can make the pattern after pressing more natural, and the discarded tobacco leaf main vein has no exogenous taste, which will not affect the quality of the tobacco leaf. When the pressure is large enough, the cells of the discarded tobacco leaf main vein can also be broken, and the organic matter released by the broken discarded tobacco leaf main vein will also penetrate to the surface of the tobacco leaf, further improving the color of the pattern part while not affecting the taste of the tobacco leaf, and improving the color difference between the pattern part and the conventional part.

[0012] In step S1, the discarded tobacco leaf main vein can come from the tobacco leaf main vein removed during the processing of cigar wrappers or tobacco leaf wrappers. The discarded tobacco leaf main vein affects the pressing effect. In terms of moisture content, if the moisture content is too low, the tobacco leaf to be pressed is easily broken during the pressing process, and the broken damage is different from the cell rupture, which will have a significant impact on the appearance of the tobacco leaf, thereby affecting the application of the tobacco leaf as a wrapper. If the moisture content is too high, the discarded tobacco leaf main vein is too soft, and it is not easy to show the indentation. As preferred in the present application, the discarded tobacco leaf main vein is adjusted to (25.0±2.0)% before being fixed to the bottom plate.

[0013] As a preferred embodiment of the present application, the length of the discarded tobacco main vein is not less than 40 cm in length and fixed interval. As a preferred embodiment of the present application, the interval between adjacent discarded tobacco main veins is controlled to be 0.3-0.6 mm. As a preferred embodiment of the present application, before being fixed, the discarded tobacco main vein is trimmed to remove 2-4 cm of the base of the main vein to prevent the part from hardening and damaging the tobacco to be pressed.

[0014] In step S2, the selection of the tobacco to be pressed affects the pressing effect. In terms of color, the greater the difference between the color of the tobacco itself and the color of the indentation, the more obvious the contrast, and the better the pressing effect. As a preferred embodiment of the present application, tobacco of yellow-brown, medium-brown or red-brown color is selected.

[0015] In terms of thickness, too thin tobacco is prone to damage during pressing, and too thick tobacco does not meet the quality requirements of tobacco. As a preferred embodiment of the present application, the thickness of the tobacco is 0.08-0.15 mm.

[0016] The direction of pressing affects the direction of the lines after the tobacco is rolled into a cigarette. As a preferred embodiment of the present application, the angle between the tobacco branch vein and the discarded tobacco main vein is 45°-60°. As a preferred embodiment of the present application, the front of the tobacco is used to contact the discarded tobacco main vein, and the back is used to be pressed upward, increasing the contact area between the front of the tobacco and the discarded tobacco main vein, facilitating the pressing and color development of the lines.

[0017] In step S3, the moisture content of the tobacco affects the pressing process. When the moisture content is low, the color development of the tobacco is poor, and the tobacco is prone to breakage. When the moisture content is too high, the tobacco feels sticky, and during pressing, it is prone to adhere to the pressing device, affecting the operation and being not conducive to storage. As a preferred embodiment of the present application, the tobacco is conditioned to have a moisture content of 33%-37% on the surface.

[0018] As a preferred embodiment of the present application, first, in an environment with a temperature not exceeding 45°C, a pretreatment gas flow is passed through the part to be pressed, the pretreatment gas flow containing carbon dioxide with a volume concentration of 0.9%-1.35%; then the whole tobacco is conditioned.

[0019] The greater the color difference between the embossed part and the conventional part of the tobacco leaf, the better the effect. Studies have found that carbon dioxide gas has an effect on the stomatal aperture of tobacco leaves. When the carbon dioxide concentration is within 0.9% to 1.35%, carbon dioxide treatment can increase the stomatal aperture of tobacco leaves. The inventors take advantage of this property to treat the tobacco leaf to be embossed with carbon dioxide before moisture conditioning. At this time, the stomatal aperture of the part to be embossed is relatively large, and the stomatal aperture of the non-embossed part is relatively small. During moisture conditioning, the part to be embossed can absorb more environmental moisture (although a large stomatal aperture means that the cells are more prone to dehydration, but since the environmental humidity is much greater than the water content in the cells during moisture conditioning, water absorption is the main effect at this time), so that the tobacco cells in the part to be embossed absorb a large amount of moisture and are saturated with water. Based on this, during subsequent embossing of the part to be embossed, the saturated and swollen tobacco cells in the part to be embossed are more likely to rupture and rupture to a greater extent, thereby releasing more organic matter, increasing the color of the part to be embossed, and increasing the color difference between the embossed part and the conventional part.

[0020] The gas used to dilute the carbon dioxide concentration should be a gas that does not have other effects on the tobacco leaf. As a preferred embodiment of the present application, the pre-treatment gas is composed of carbon dioxide and an inert gas. The inert gas refers to at least one of helium, neon, argon, krypton, and xenon.

[0021] The way the pre-treatment gas flows through the part to be embossed is not limited. As a preferred embodiment of the present application, a plurality of negative pressure holes are formed in the bottom plate and are in communication with the negative pressure device; the part of the surface of the bottom plate that is used to contact the main veins of the tobacco leaf forms a contact part, and the remaining part forms a hollow part; the hollow part is paved with a gas barrier film. The pre-treatment gas is sprayed onto the tobacco leaf on the template, and the negative pressure device is turned on to force the pre-treatment gas to pass through the part to be embossed of the tobacco leaf and the discarded main veins of the tobacco leaf in turn and then be sucked out from the negative pressure holes of the contact part. It can be understood that in this embodiment, it is not possible to completely prevent the pre-treatment gas from passing through the non-embossed part. The gas barrier film can concentrate most of the pre-treatment gas in the part to be embossed, so that the gas flow per unit area of the part to be embossed is significantly greater than the gas flow per unit area of the non-embossed part, and the stomatal aperture of the part to be embossed is greater than that of the non-embossed part.

[0022] The preparation method of the gas barrier film with a specific shape is not limited. In some embodiments, it is prepared by the following steps: fixing the discarded main veins of the tobacco leaf on the bottom plate, then coating a solution of the gas barrier film, and after the solution is dried into a film, the discarded main veins of the tobacco leaf are pried out, and the remaining part is used to pave the hollow part of the bottom plate; the film on the discarded main veins of the tobacco leaf is peeled off and then placed on the contact part of the bottom plate. In order to facilitate the peeling of the film on the discarded main veins of the tobacco leaf, the discarded main veins of the tobacco leaf are immersed in a release agent before being fixed. The release agent can be selected from silicone oil, vegetable oil, etc.

[0023] In some other embodiments, the gas barrier film is selected as a polyvinyl alcohol film, the complete polyvinyl alcohol film is laid flat and heated to 70-90°C, and then the waste tobacco vein after water absorption is placed on the polyvinyl alcohol film, so that the part of the polyvinyl alcohol film in contact with the waste tobacco vein gradually dissolves.

[0024] In order to avoid the water loss of the to-be-embossed part after water absorption based on the large pore opening thereof, as a preferred embodiment of the present application, after moisture regain, a reprocessing air flow containing carbon dioxide with a volume concentration of 1.8%-2.7% is passed through the whole tobacco leaf. The pore opening of the whole tobacco leaf is reduced by the high-concentration carbon dioxide to lock the water of the tobacco leaf. At the same time, the reprocessing air flow can also take away the free water on the surface of the tobacco leaf to balance the moisture of the tobacco leaf.

[0025] In step S4, the pressing pressure should be limited, and too large or too small will affect the generation of the lines, and as a preferred embodiment of the present application, the pressing pressure is 45-75 N.

[0026] The pressing mode is not limited, and as a preferred embodiment of the present application, the pressing treatment is rolling pressing. That is, a pressing roller is used to roll back and forth on the surface of the tobacco leaf to make the tobacco leaf fully contact with the waste tobacco vein.

[0027] As a preferred embodiment of the present application, step S5 is further included. The tobacco leaf is subjected to color fixing treatment, and the color fixing treatment conditions are that the tobacco leaf after pressing is placed in a constant temperature and humidity environment with a temperature of 33-37°C and a relative humidity of 76%-80% for color fixing for 3-5 days. In the environment with relatively high temperature and humidity, the conversion of the contents in the tobacco leaf to the tobacco leaf will be further deepened, and therefore the processed tobacco leaf is placed in the environment with relatively high temperature and humidity for color fixing treatment, so as to enlarge the color difference between the pressed lines and the non-pressed lines, strengthen the effect of the pressed lines, fix the color, and meet the process processing requirements. Especially in the embodiment after the carbon dioxide treatment, the carbon dioxide remaining in the to-be-embossed part can promote the decomposition of chlorophyll in this part, and further improve the color difference between the pressed lines and the non-pressed lines.

[0028] Another object of the present application is to provide a tobacco leaf with lines prepared by the above method, which has natural lines on the surface and good smoking taste.

[0029] The present application has the following beneficial effects:

[0030] 1. The present application provides a preparation method of a tobacco leaf with lines, which forms lines by using waste tobacco veins, obtains natural and clear lines without affecting the smoking taste of the tobacco leaf, and realizes the reuse of the waste tobacco veins.

[0031] 2. In some embodiments, the tobacco leaves to be embossed can be selected from the tobacco leaves having quality defects such as water stains, press oil and the like on the surface due to improper storage, and the defective parts are set as the embossed parts to cover the defects and realize the reuse of the unqualified tobacco leaves.

[0032] 3. In some embodiments, the stomatal aperture of the tobacco leaves is controlled by a certain concentration of carbon dioxide to regulate the water absorption efficiency of the embossed parts and the non-embossed parts of the tobacco leaves, thereby improving the color difference between the embossed parts and the conventional parts of the tobacco leaves.

[0033] 4. The application provides a cigar wrapper with a pattern, and the cigar wrapper has clear and natural patterns, novel and unique appearance, and can not only enhance the recognition of the cigar product and improve the product value, but also enrich the types of cigar wrappers and meet the individual needs of cigar consumers and the market. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a comparison diagram of the embossed tobacco leaves and the non-embossed tobacco leaves prepared in Example 1;

[0035] Figure 2 is a comparison diagram of the cigars prepared from the embossed tobacco leaves of Example 1 and the cigars prepared from the non-embossed tobacco leaves. DETAILED DESCRIPTION

[0036] The following is a specific embodiment of the application, and the technical solutions of the application are further described in combination with the drawings, but the application is not limited to these embodiments.

[0037] Example 1

[0038] A cigar wrapper with a pattern is prepared by the following steps:

[0039] S1. The tobacco main veins removed in the processing of cigar wrappers or tobacco leaves are selected, the length of the main veins should not be shorter than 40 cm, and the base 3 cm of the main veins is removed. The moisture of the discarded tobacco main veins is adjusted to 25%, and the moisture is balanced to the extent that there is no obvious water on the surface of the main veins, and the veins are soft and not easy to fold. The discarded tobacco main veins with balanced moisture are clamped at both ends with a clamp, and are fixed in parallel on the bottom plate in the same direction, the distance between adjacent discarded tobacco main veins is 0.5 mm, and a pressing template is formed.

[0040] S2. The tobacco leaves with good maturity and a thickness of 0.08 mm and yellow-brown color are selected as the embossed tobacco leaves. The tobacco leaves are laid on the pressing template in the direction of 60° between the branch veins and the discarded tobacco main veins, with the front surface of the tobacco leaves facing downward and the part in contact with the discarded tobacco main veins forming the embossed part and the remaining part forming the non-embossed part.

[0041] S3. The tobacco leaves are rehydrated to a moisture content of 35%, and the rehydration conditions are recorded as follows: a constant temperature and humidity environment with a temperature of 35°C and a humidity of 90%, and a rehydration time of 3 hours. Subsequently, the leaves are sealed and stored until the moisture content is uniform and there is no visible moisture on the surface.

[0042] S4. The tobacco leaves are rolled and pressed on the back surface using a wooden roller with a pressure of 60N, so that the to-be-embossed part is embossed under the action of the main veins of the discarded tobacco leaves.

[0043] S5. The pressed tomato leaves are placed in a constant temperature and humidity environment with a temperature of 35°C and a relative humidity of 78% for 4 days.

[0044] The prepared cigar tomato skin, and the cigar made from the cigar tomato skin as shown in Figure 1 and Figure 2 The tomato skin has clear and unique lines, a novel and natural appearance, and a strong recognition degree, and the variety of tomato skin raw materials is enriched, which can meet the individual needs of cigar consumers and the market.

[0045] Example 2

[0046] This example is basically the same as example 1, except that step S5 is not performed.

[0047] Example 3

[0048] A cigar tomato skin with lines is prepared by the following steps:

[0049] S1. Select the main veins of discarded tobacco leaves removed during the processing of cigar tomato skin or tomato tobacco leaves, and the length of the main veins should not be shorter than 40 cm. Remove 3 cm from the base of the main veins. Adjust the moisture content of the discarded tobacco leaves to 25%, and fully balance the moisture content until there is no visible moisture on the surface of the main veins, and the veins are soft and not easy to fold. Then immerse the discarded tobacco leaves in vegetable oil for use, and the vegetable oil is extracted from discarded tobacco leaves by steam distillation.

[0050] A bottom plate provided with a plurality of negative pressure holes is selected, and the negative pressure holes are located at one end of the bottom surface of the bottom plate and communicate with a negative pressure device. The discarded tobacco leaves are taken out of the vegetable oil and then fixed to the bottom plate in the same way as in example 1. Then, polyvinyl alcohol solution is applied on the bottom plate, covering the part of the bottom plate not covered by the discarded tobacco leaves and the discarded tobacco leaves themselves. After the polyvinyl alcohol solution is dried into a film, the discarded tobacco leaves and the film covering them are torn off, and the remaining polyvinyl alcohol film on the bottom plate is the required gas barrier film.

[0051] After the film on the discarded tobacco leaves is peeled off, the discarded tobacco leaves are re-fixed to the bottom plate in the same way as in example 1 to form a pressing template.

[0052] S2. Select the tobacco leaves with good maturity, thickness of 0.15 mm, and yellowish brown color as the tobacco leaves to be embossed. Place the tobacco leaves on the embossing template in a direction of 60° between the branch veins and the main veins of the discarded tobacco leaves, with the front of the tobacco leaves facing downward and the part in contact with the main veins of the discarded tobacco leaves forming the part to be embossed, and the rest forming the non-embossed part.

[0053] S3. Put the whole structure of the embossing template and the tobacco leaves into a constant temperature sealed environment at 30°C, spray the pretreatment gas on the tobacco leaves in a direction from top to bottom, and open the negative pressure device to force the pretreatment gas to pass through the part to be embossed and the main veins of the discarded tobacco leaves in turn and then be sucked out from the negative pressure holes of the contact part. Repeat this operation 5 times. The pretreatment gas is composed of carbon dioxide and argon mixed at a volume ratio of 1:99.

[0054] Then, re-moisturize the whole tobacco leaves, and the re-moisturizing conditions are the same as those in Example 1: a constant temperature and humidity environment at a temperature of 35°C and a humidity of 90%, and the re-moisturizing time is 3h.

[0055] S4. Roll and press the tobacco leaves on the back of the tobacco leaves with a wooden press roller, and the pressure is 60N, so that the part to be embossed is embossed under the action of the main veins of the discarded tobacco leaves.

[0056] S5. Put the pressed tobacco leaves into a constant temperature and humidity environment at a temperature of 35°C and a relative humidity of 78% for color fixing for 4 days.

[0057] Example 4

[0058] This example is basically the same as Example 3, and the only difference is that:

[0059] In step S3, put the whole structure of the embossing template and the tobacco leaves to be embossed into a constant temperature sealed environment at 30°C, spray the pretreatment gas on the tobacco leaves to be embossed in a direction from top to bottom, and open the negative pressure device to force the pretreatment gas to pass through the part to be embossed and the main veins of the discarded tobacco leaves in turn and then be sucked out from the negative pressure holes of the contact part. Repeat this operation 5 times. The pretreatment gas is composed of carbon dioxide and argon mixed at a volume ratio of 1:99.

[0060] Then, re-moisturize the whole tobacco leaves, and the re-moisturizing conditions are the same as those in Example 1: a constant temperature and humidity environment at a temperature of 35°C and a humidity of 90%, and the re-moisturizing time is 3h.

[0061] Then tear off the polyvinyl alcohol film on the bottom plate, spray the re-treatment gas on the tobacco leaves to be embossed in a direction from top to bottom, and open the negative pressure device to force the re-treatment gas to pass through the tobacco leaves to be embossed in turn and then be sucked out from the negative pressure holes. Repeat this operation 3 times. The re-treatment gas is composed of carbon dioxide and argon mixed at a volume ratio of 2.5:97.5.

[0062] Example 5

[0063] A cigaer casing with a texture is prepared by the following steps:

[0064] S1. Selecting the main veins of tobacco leaves removed in the processing of cigar casings or tobacco leaves, the length of the main veins should not be shorter than 40 cm, and removing 3 cm from the base of the main veins. Adjusting the moisture of the discarded main veins of tobacco leaves to 23%, and fully balancing until there is no obvious water on the surface of the main veins, and the veins are soft and not easy to fold. Clamping the ends of the discarded main veins of tobacco leaves that have completed moisture balancing with a clamp, and fixing them in parallel on the bottom plate in the same direction, with a spacing of 0.3 mm between adjacent discarded main veins of tobacco leaves, to form a pressing template.

[0065] S2. Selecting tobacco leaves with good maturity, a thickness of 0.1 mm, and a medium brown color as the tobacco leaves to be textured. Laying the tobacco leaves on the pressing template in a direction of 45° between the branch veins and the discarded main veins of tobacco leaves, with the front surface of the tobacco leaves facing downward and the part in contact with the discarded main veins of tobacco leaves forming the textured part, and the remaining part forming the non-textured part.

[0066] S3. Adjusting the moisture of the tobacco leaves to 33%, and recording the conditioning conditions as follows: a constant temperature and humidity environment with a temperature of 35℃ and a humidity of 90%, and a conditioning time of 2.5 h. Then sealing and storing, and balancing until the moisture of the tobacco leaves is uniform and there is no obvious water on the surface.

[0067] S4. Rolling and pressing the tobacco leaves on the back surface of the tobacco leaves with a wooden pressing roller, with a pressure of 45 N, so that the textured part is textured under the action of the discarded main veins of tobacco leaves.

[0068] S5. Placing the pressed cigar casing tobacco leaves into a constant temperature and humidity environment with a temperature of 33℃ and a relative humidity of 76% for color fixing for 5 days.

[0069] Example 6

[0070] A cigaer casing with a texture is prepared by the following steps:

[0071] S1. Selecting the main veins of tobacco leaves removed in the processing of cigar casings or tobacco leaves, the length of the main veins should not be shorter than 40 cm, and removing 3 cm from the base of the main veins. Adjusting the moisture of the discarded main veins of tobacco leaves to 27%, and fully balancing until there is no obvious water on the surface of the main veins, and the veins are soft and not easy to fold. Clamping the ends of the discarded main veins of tobacco leaves that have completed moisture balancing with a clamp, and fixing them in parallel on the bottom plate in the same direction, with a spacing of 0.6 mm between adjacent discarded main veins of tobacco leaves, to form a pressing template.

[0072] S2. Selecting tobacco leaves with good maturity, a thickness of 0.1 mm, and a red-brown color as the tobacco leaves to be textured. Laying the tobacco leaves on the pressing template in a direction of 50° between the branch veins and the discarded main veins of tobacco leaves, with the front surface of the tobacco leaves facing downward and the part in contact with the discarded main veins of tobacco leaves forming the textured part, and the remaining part forming the non-textured part.

[0073] S3. The tobacco leaves were rehydrated to a moisture content of 37%, and the rehydration conditions were recorded as follows: a constant temperature and humidity environment with a temperature of 35°C and a humidity of 90%, and a rehydration time of 3.5 h. Subsequently, the tobacco leaves were sealed and stored until the moisture content was uniform and the surface was free of visible moisture.

[0074] S4. The tobacco leaves were rolled and pressed on the back surface of the tobacco leaves using a wooden roller with a pressure of 75 N, so that the to-be-embossed part was embossed under the action of the main vein of the discarded tobacco leaves.

[0075] S5. The pressed tobacco leaves were placed in a constant temperature and humidity environment with a temperature of 37°C and a relative humidity of 80% for a color fixing time of 3 days.

[0076] Comparative Example 1

[0077] This comparative example is basically the same as Example 1, except that a wooden stick is used instead of the main vein of the discarded tobacco leaves.

[0078] Color difference detection

[0079] The color difference between the embossed part and the conventional part of the cigar wrapper obtained in the examples and comparative examples was detected using a color difference detector, and the detection results are shown in Table 1.

[0080] Table 1.

[0081]

[0082] As shown in Table 1, it can be seen from Comparative Example 1 and Comparative Example 2 that using the main vein of the discarded tobacco leaves as the embossing template of the tobacco leaves not only makes the embossed part natural, but also effectively increases the color difference between the embossed part and the conventional part of the tobacco leaves, which may be caused by the penetration of organic substances in the main vein of the discarded tobacco leaves into the surface of the tobacco leaves to deepen the color of the embossed part. It can be seen from Comparative Example 1 and Example 2 that the color fixing treatment step can further deepen the color difference between the embossed part and the conventional part of the tobacco leaves, which may be caused by the transformation of the contents in the tobacco leaves in a high temperature and high humidity environment. It can be seen from Comparative Example 1 and Examples 3 and 4 that a certain concentration of carbon dioxide treatment can further deepen the color difference between the embossed part and the conventional part of the tobacco leaves, which may be caused by the influence of carbon dioxide on the opening degree of the stomata of the tobacco leaves and the promotion of the decomposition of chlorophyll.

[0083] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A method of making a banded cigar wrapper, characterized by: The method comprises the following steps: S1. Selecting discarded tobacco main veins, fixing the discarded tobacco main veins on a bottom plate to form a pressing template, and fixing the discarded tobacco main veins on the bottom plate after adjusting the moisture content of the discarded tobacco main veins to (25.0±2.0) %; S2. Placing tobacco leaves on the pressing template, the part of the tobacco leaves in contact with the discarded tobacco main veins forming a to-be-embossed part, and the remaining part forming a non-embossed part; S3. Moisturizing the tobacco leaves, and moisturizing the tobacco leaves to a moisture content of 33% to 37% on the surface of the tobacco leaves; In step S3, first, a pre-treatment gas stream is passed through the to-be-embossed part in an environment with a temperature not exceeding 45°C, the pre-treatment gas stream containing carbon dioxide with a volume concentration of 0.9% to 1.35%; then, the whole tobacco leaves are moisturized; After moisturizing, a re-treatment gas stream is passed through the whole tobacco leaves, the re-treatment gas stream containing carbon dioxide with a volume concentration of 1.8% to 2.7%; S4. Pressing the tobacco leaves, and the pressing pressure is 45 to 75 N; The cells of the to-be-embossed part of the tobacco leaves are broken under the action of the discarded tobacco main veins, and the free water in the tobacco leaf tissue carries part of the organic matter in the tobacco leaves to the surface of the tobacco leaves, and the organic matter is oxidized and condensed into brown positions; the non-embossed part remains unchanged; thus, a color difference is generated between the to-be-embossed part and the non-embossed part of the tobacco leaves, and a cigar wrapper with a pattern is obtained; S5. Color fixing treatment is performed on the tobacco leaves, and the color fixing treatment conditions are as follows: the pressed tobacco leaves are placed in a constant temperature and humidity environment with a temperature of 33 to 37°C and a relative humidity of 76% to 80% for color fixing for 3 to 5 days.

2. A method of making a banded cigar wrapper according to claim 1, characterized in that: The pre-treatment gas stream is composed of carbon dioxide and an inert gas.

3. A method of making a banded cigar wrapper according to claim 1, wherein: The bottom plate is provided with a plurality of negative pressure holes; the part of the surface of the bottom plate used to contact the discarded tobacco main veins forms a contact part, and the remaining part forms an empty part; the empty part is paved with a gas barrier film.

4. A method of making a banded cigar wrapper according to claim 1, characterized in that: In step S4, the pressing treatment is rolling pressing.

5. A cigar wrapper with a pattern prepared by the method according to any one of claims 1 to 4.

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