Electrostatic spraying equipment and aerosol generating substrate manufacturing system

Abstract

The utility model provides electrostatic spraying equipment, which is used for uniformly attaching a viscosity-reducing spraying object to the surface of an aerosol generating substrate, the electrostatic spraying equipment comprises an electrostatic generator, the electrostatic generator is used for enabling the viscosity-reducing spraying object to be charged, and the charged viscosity-reducing spraying object is uniformly attached to the surface of the aerosol generating substrate after being sprayed. The utility model further provides an aerosol generating substrate and a manufacturing system thereof, the system comprises a first rolling device, a first drying device, a first conveying device, an electrostatic spraying device, a second rolling device, a second conveying device and a second drying device, and the purpose is to reduce the surface viscosity of the aerosol generating substrate. And adverse effects caused by mutual adhesion and block connection due to long-time storage of the aerosol generating substrates after boxing are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco processing, in particular to an electrostatic spraying device and an aerosol generating matrix manufacturing system. Background Art

[0002] Reconstituted tobacco is the main tobacco material used in heat-not-burn cigarettes and is also the core raw material of heat-not-burn cigarettes. Reconstituted tobacco, also known as tobacco flakes, reconstituted tobacco, and homogenized tobacco, is an aerosol-generating matrix. Its physical and chemical properties are similar to those of tobacco leaves and can be used to replace tobacco leaves as a raw material for tobacco products. The production processes of reconstituted tobacco leaves mainly include rolling method, thick pulp method, papermaking method, and dry method. Rolling method reconstituted tobacco leaves are made by crushing tobacco stems, tobacco dust, stems and other tobacco materials, and then mixing and stirring them with adhesives, enhancers, humectants and water in a certain proportion to form loose granules, and then rolling them through a roller press to form a continuous thin sheet with a thickness of about 0.1 to 0.3 mm. The thin sheet is dried and then cut into reconstituted tobacco leaf shreds by a shredder. Reconstituted tobacco leaf shreds are usually rolled thin sheets with a length of about 3 to 5 mm and a width of about 0.8 to 1.2 mm.

[0003] Since the thin sheets contain a certain amount of adhesive, the thin sheets are prone to agglomeration during long-term packaging and storage, which affects subsequent use. At present, the problem of thin sheets sticking and agglomeration after packaging is generally improved by reducing the packing density of the thin sheets, reducing the moisture content of the thin sheets, or reducing the amount of adhesive, but this will result in unfavorable consequences such as increased packaging quantity, increased thin sheet breakage, and decreased thin sheet strength. Utility Model Content

[0004] In order to reduce the surface stickiness of the roll-pressed thin sheets and reduce the adverse effects caused by the thin sheets sticking to each other due to long-term storage after packaging, this patent provides the following technical solutions:

[0005] The first aspect: provides an electrostatic spraying device for uniformly attaching a viscosity-reducing spray to the surface of an aerosol-generating substrate, the electrostatic spraying device comprising an electrostatic generator, the electrostatic generator being used to charge the viscosity-reducing spray, and when the charged viscosity-reducing spray is sprayed, it will uniformly adhere to the surface of the aerosol-generating substrate; the electrostatic spraying device also comprises a spraying chamber and a storage and feeding device, the spraying chamber comprising: an aerosol-generating substrate inlet, a first spraying cabin, a second spraying cabin, an air jet channel and a dust collection channel; the storage and feeding device is used to transport the viscosity-reducing spray to the spraying chamber.

[0006] Furthermore, the aerosol generating substrate inlet is provided with an atomizing water nozzle, and the atomizing water nozzle is used to humidify the aerosol generating substrate and increase the adsorption amount of the viscosity reducing spray on the surface of the aerosol generating substrate.

[0007] Furthermore, the first spray booth includes a first electrode plate and a first spray gun, one end of the electrostatic generator is connected to the first electrode plate and the other end is connected to the first spray gun, the first electrode plate and the first spray gun are set opposite to each other and the aerosol generating matrix passes between the two; the second spray booth includes a second electrode plate and a second spray gun, one end of the electrostatic generator is connected to the second electrode plate and the other end is connected to the second spray gun, the second electrode plate and the second spray gun are set opposite to each other and the aerosol generating matrix passes between the two; the first electrode plate and the second spray gun are located on the same side, and the first spray gun and the second electrode plate are located on the same side, so that the viscosity reducing spray can cover at least two directions of the aerosol generating matrix.

[0008] Furthermore, the jet passage includes a compressed air inlet and a compressed air nozzle.

[0009] Furthermore, the dust collecting channel includes a dust collecting strip, a dust collecting chamber and a dust collecting main pipe. The dust collecting strip is arranged inside the first spraying chamber and the second spraying chamber. The dust collecting strip and the dust collecting chamber absorb excess viscosity reducing spray and collect them in the dust collecting main pipe.

[0010] Furthermore, the viscosity-reducing spray includes one or more microparticles, and the particle size of the microparticles is 100-300 meshes.

[0011] Furthermore, the moisture content of the microparticles is 8-10%.

[0012] Furthermore, the viscosity reducing spray is tobacco powder, and the sugar content of the tobacco powder is lower than the sugar content of the aerosol generating substrate.

[0013] The second aspect: provides an aerosol generating matrix manufacturing system, the above-mentioned electrostatic spraying equipment.

[0014] Furthermore, it also includes: a first rolling device and a first drying device arranged upstream of the electrostatic spraying device, and a second rolling device, a second conveying device and a second drying device arranged downstream of the electrostatic spraying device, the aerosol generating matrix is ​​a sheet-like aerosol generating matrix, wherein the first rolling device is used to calender the mixture of raw materials and auxiliary materials to form a sheet-like aerosol generating matrix, and the second rolling device is used to increase the bonding strength between the viscosity reducing spray and the sheet-like aerosol generating matrix.

[0015] This patent has the following beneficial effects:

[0016] 1. In the method of reducing the surface viscosity of the sheet by the roller pressing method of the present invention, the sheet is dried for the first time after the first roller pressing of the sheet. At this time, the sheet has a certain strength and the surface viscosity has been effectively reduced. The sheet does not stick to the roller and does not break during the powder coating roller pressing. The atomized water nozzle at the sheet entrance wets the sheet surface to enhance the adsorption of the viscosity-reducing spray. The sheet adsorbing a large amount of the viscosity-reducing spray is rolled for the second time, so that the sheet surface and the viscosity-reducing spray are more firmly combined. The powder electrostatic spraying process has a large spraying range and a uniform spraying effect, which can effectively reduce the surface viscosity of the sheet.

[0017] 2. In this patent, the sheet runs between the first electrode plate and the first spray gun, close to one side of the first electrode plate, and the sheet is pulled by the subsequent roller press to obtain a certain tension to avoid contact between the sheet and the first electrode plate; when the system is working, the smoke powder particles are driven by the airflow through the nozzle of the first spray gun with negative charge, and under the dual effects of airflow and electrostatic attraction, they fly to the first electrode plate with positive charge, and are intercepted by the sheet halfway, thus forming a single-sided powder coating effect. By exchanging the positions of the metal plates and spray guns in the upper and lower compartments, the effect of double-sided powder coating of the sheet can be achieved;

[0018] 3. In addition to roller-pressed thin sheets, this patented electrostatic spraying equipment can also be used for other sheet-like aerosol-generating matrices, such as papermaking thin sheets, thick slurry thin sheets, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a process flow chart of reducing the viscosity of the surface of the aerosol-generating substrate of the utility model;

[0021] Figure 2 This is a schematic diagram of the aerosol generation matrix manufacturing system of the utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the electrostatic spraying equipment of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the spray chamber of the utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the spray chamber of the utility model.

[0025] The reference numerals are described as follows:

[0026] 1: The first roller pressing equipment

[0027] 2: The first drying equipment

[0028] 3: First transmission equipment

[0029] 4: Electrostatic spraying equipment

[0030] 41: Thin film spraying room

[0031] 411: Flake Entrance

[0032] 4111: Atomizing water nozzle

[0033] 412: First spray booth

[0034] 4121: First plate

[0035] 4122: First electrode

[0036] 4123: The First Spray Gun

[0037] 413: Second spray booth

[0038] 4131: Second plate

[0039] 4132: Second electrode

[0040] 4133: Second spray gun

[0041] 414: Jet Channel

[0042] 4141: Compressed air inlet

[0043] 4142: Compressed air nozzle

[0044] 415: Dust collection channel

[0045] 4151: Dust collecting strip

[0046] 4152: Dust collection compartment

[0047] 4153: Dust collection main

[0048] 42: Static Electricity Generator

[0049] 43: Storage and feeding device

[0050] 5: Second roller pressing equipment

[0051] 6: Second transmission device

[0052] 7: Second drying equipment DETAILED DESCRIPTION

[0053] The detailed features and advantages of this patent are described in detail in the specific implementation method below, and the content is sufficient to enable any technical personnel in this field to understand the technical content of this patent and implement it accordingly. According to the description, claims and drawings disclosed in this specification, technical personnel in this field can easily understand the relevant purposes and advantages of this patent.

[0054] In order to make the purpose, technical solutions and advantages of this patent clearer, the implementation method of this patent will be further described in detail below in conjunction with the accompanying drawings.

[0055] like Figure 1 As shown, Example 1 is a method for manufacturing a roll-pressed sheet with low surface viscosity according to the present invention, and the specific steps are as follows:

[0056] (1) Prepare raw materials for producing tobacco sheets and prepare a viscosity-reducing spray. The viscosity-reducing spray used in this embodiment is tobacco powder.

[0057] For reference, tobacco raw materials such as tobacco leaves, fragments and crushed powder are removed from impurities and the moisture content is adjusted to below 12% for pulverization, and tobacco powder with a particle size of 150 mesh is obtained by controlling the operating parameters of the pulverizer;

[0058] The prepared tobacco powder is divided into two parts, one part is mixed with sodium carboxymethyl cellulose at a mass ratio of 100:2 to form a dry material; the other part is used as a viscosity-reducing spray;

[0059] The wood fiberboard and distilled water were mixed in a mass ratio of 4:96 and then hydraulically pulped to obtain a wood pulp liquid with a concentration of 4%;

[0060] Mixing sodium carboxymethyl cellulose and glycerol at a mass ratio of 2:100 to form a dispersion of sodium carboxymethyl cellulose;

[0061] The prepared wood pulp liquid and sodium carboxymethyl cellulose dispersion liquid are mixed in a mass ratio of 1:1, and stirred thoroughly to form a wet material;

[0062] The dry material and the wet material are stirred and mixed in a mass ratio of 3:2 to obtain a granular or agglomerated dry-wet mixed material.

[0063] (2) The dry-wet mixture is fed into a roller forming process and a thin sheet of wet material with a thickness of 0.20 mm is formed at the outlet of the first roller pressing device.

[0064] (3) The wet flakes are fed into the first drying device 2, and the first drying temperature is set to 85° C. The drying time is 2 min. The first moisture content of the flakes after the first drying reaches 17.5%. At this time, the tensile strength of the flakes is greatly improved compared to before drying, and the viscosity of the flake surface is significantly reduced due to water loss during drying.

[0065] In this embodiment, the first drying device 2 and the second drying device 7 are commonly used devices in the field of roller-pressed slice drying, generally a belt oven, and the wet slice material is carried by a mesh belt and runs inside the oven for drying, and the drying method adopts hot air convection drying or infrared drying.

[0066] (4) After primary drying, the sheet is sent to the electrostatic spraying device 4 through the first conveying device 3, and is first lightly moistened by the atomized water nozzle 4111. The purpose of moistening the sheet surface is to enable the subsequently sprayed smoke powder to better adhere to the sheet surface. Then, the smoke powder prepared in step (1) is sprayed by the first spray gun 4123 and the second spray gun 4133 respectively, so that the smoke powder adheres to both sides of the sheet, further reducing the viscosity of the sheet.

[0067] In this embodiment, the first conveying device 3 is a lifting belt, which is used to lift the slices after the first stage of drying to a certain height so that the semi-dried slices can freely fall vertically into the powder spraying room for powder spraying.

[0068] (5) The sheet with the smoke powder sprayed on both sides is rolled by the second rolling device 5, so that the smoke powder on the surface of the sheet is more firmly bonded to the sheet.

[0069] (6) After the second rolling, the slices are sent to the second drying device 7 through the second conveying device 6. The second drying temperature is set to 120° C. and the drying time is 6 minutes. After the second drying, the second moisture content of the slices reaches 6%.

[0070] (7) After secondary drying, the slices are cut into strips and packed in boxes.

[0071] The invention relates to an electrostatic spraying system for producing roll-pressed thin sheets suitable for the above-mentioned manufacturing method.

[0072] like Figure 2 As shown, the manufacturing system for producing electrostatic spraying of roller-pressed thin films includes a first roller pressing device 1, a first drying device 2, a first conveying device 3, an electrostatic spraying device 4, a thin film spraying chamber 41, a thin film inlet 411, an atomizing water nozzle 4111, a first spraying cabin 412, a first electrode 4121, a first electrode 4122, a first spray gun 4123, a second spraying cabin 413, a second electrode 4131, a second electrode 4132, a second spray gun 4133, an air jet channel 414, a compressed air inlet 4141, a compressed air nozzle 4142, a dust collecting channel 415, a dust collecting strip 4151, a dust collecting cabin 4152, a dust collecting main pipe 4153, an electrostatic generator 42, a storage and feeding device 43, a second roller pressing device 5, a second conveying device 6, and a second drying device 7.

[0073] The first rolling device 1 is used for sheet calendering, and in this embodiment is mainly used for sheet forming by rolling method. In this embodiment, the two rollers of the first rolling device 1 have equal diameters but different speeds. After rolling, the sheet adheres to the fast roller and is peeled off by a scraper.

[0074] The second rolling device 5 uses two equal-diameter rollers to rotate at the same speed relative to each other. The linear speed of the roller surface matches the running speed of the sheet. The powder-coated sheet is rolled to enhance the adhesion between the tobacco powder and the sheet substrate.

[0075] like Figure 3 As shown, the electrostatic spraying equipment 4 includes a thin film spraying chamber 41, an electrostatic generator 42 and a storage and feeding device 43. The storage and feeding device 43 transports smoke powder to the thin film spraying chamber 41. The electrostatic generator 42 is connected to the thin film spraying chamber 41 and provides positive and negative charges to the thin film spraying chamber 41.

[0076] The storage and feeding device 43 is a commonly used device in the powder electrostatic spraying industry, which is used to temporarily store a certain amount of smoke powder and transport the smoke powder to the first spray gun 4123 and the second spray gun 4133. The storage and feeding device 43 is generally equipped with a stirring device to continuously stir the smoke powder to prevent the formation of agglomerated particles.

[0077] The electrostatic generator 42, the storage and feeding device 43, the first spray gun 4123 and the second spray gun 4133 are commonly used equipment in the powder spraying industry. The basic principle is that the smoke powder is transported from the powder silo to the powder spray gun by gravity, a screw conveyor or an airflow, and is sucked into the high-speed airflow through the negative pressure formed by the compressed air, mixed with the air and dispersed for the first time. The high-speed airflow carries the smoke powder through the spray gun nozzle, and the powder is polarized and carries a negative charge in the negatively charged area of ​​the nozzle. The powder moves to the positively charged area under the action of the electric field force.

[0078] like Figure 4 , Figure 5 As shown, the sheet spraying chamber 41 in this embodiment includes a sheet inlet 411, a first spraying chamber 412, a second spraying chamber 413, an air jet channel 414 and a dust collection channel 415. The sheet inlet 411 is provided with two rows of atomized water nozzles 4111, a total of 6, and the atomized water nozzles 4111 are used to humidify the sheet and increase the adsorption amount of smoke powder on the sheet surface;

[0079] An air jet channel 414 and a dust collecting channel 415 are provided in the second spraying cabin 413. The air jet channel 414 includes four compressed air inlets 4141 and four compressed air nozzles 4142. The compressed air nozzles 4142 are used to sweep the floating dust on the surface of the thin sheet after being coated with powder. A dust collecting cabin 4152 is provided below the compressed air nozzles 4142. The dust collecting channel 415 is provided with four dust collecting strips 4151, one dust collecting cabin 4152 and one dust collecting main pipe 4153. The dust collecting strips 4151 are provided at the corners inside the first spraying cabin 412 and the second spraying cabin 413. The dust collecting main pipe 4153 is at the bottom of the second spraying cabin 413. The dust collecting strips 4151 and the dust collecting cabin 4152 absorb excess smoke and powder and collect them in the dust collecting main pipe 4153. The dust collecting main pipe 4153 centrally transports the dust collected in the thin sheet spraying chamber 41.

[0080] The first spraying cabin 412 includes a first pole plate 4121, a first electrode 4122 and a first spray gun 4123, one end of the first electrode 4122 is connected to the electrostatic generator 42 and the other end is connected to the first pole plate 4121, and the first pole plate 4121 and the first spray gun 4123 are arranged opposite to each other; the second spraying cabin 413 includes a second pole plate 4131, a second electrode 4132 and a second spray gun 4133, one end of the second electrode 4132 is connected to the electrostatic generator 42 and the other end is connected to the second pole plate 4131, and the second pole plate 4131 and the second spray gun 4133 are arranged opposite to each other; the first spraying cabin 412 and the second spraying cabin 413 are arranged up and down, and powder is sprayed on the upper and lower surfaces of the sheet respectively. A first electrode plate 4121 is arranged on one side of the first spraying cabin 412, and the plate width is slightly narrower than the sheet width. The first electrode plate 4121 is connected to the electrostatic generator 42 so that the first electrode plate 4121 carries a positive charge. Two first spray guns 4123 are arranged side by side on the other side. The spray guns are connected to the electrostatic generator 42 so that the nozzle of the first spray gun 4123 carries a negative charge, and the first spray gun 4123 is connected to the storage and feeding device 43 by a pipeline. A second electrode plate 4131 is arranged on one side of the second spraying cabin 413, and the plate width is slightly narrower than the sheet width. The second electrode plate 4131 is connected to the electrostatic generator 42 so that the second electrode plate 4131 carries a positive charge. Two second spray guns 4133 are arranged side by side on the other side. The spray guns are connected to the electrostatic generator 42 so that the nozzle of the second spray gun 4133 carries a negative charge, and the second spray gun 4133 is connected to the storage and feeding device 43 by a pipeline. The first electrode plate 4121 and the second spray gun 4133 are located on the same side, and the first spray gun 4123 and the second electrode plate 4131 are located on the same side.

[0081] The thin sheet runs between the first electrode plate 4121 and the first spray gun 4123, close to one side of the first electrode plate 4121, and the thin sheet obtains a certain tension through the traction of the subsequent roller press to avoid the thin sheet from contacting the first electrode plate 4121; when working, the smoke powder particles are driven by the airflow through the nozzle of the first spray gun 4123 with negative charge, and under the dual effects of airflow and electrostatic attraction, fly to the first electrode plate 4121 with positive charge, and are intercepted by the thin sheet in the middle, thereby forming a single-sided powder coating effect. The single-sided powder-coated sheet is run between the second electrode plate 4131 and the second spray gun 4133, close to one side of the second electrode plate 4131, and the sheet is given a certain tension by the traction of the subsequent roller press to avoid contact between the sheet and the second electrode plate 4131; during operation, the smoke powder particles are driven by the airflow through the nozzle of the second spray gun 4133 with negative charge, and under the dual effects of airflow and electrostatic attraction, fly to the second electrode plate 4131 with positive charge, and are intercepted by the sheet on the way, thereby achieving the effect of powder coating on both sides of the sheet.

[0082] In the specification of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and components of the present invention, but these terms are used here only for the convenience of description and are determined based on the example orientations shown in the drawings. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only used as illustrations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0083] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0084] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An electrostatic spraying device for uniformly attaching a viscosity-reducing spray to the surface of an aerosol-generating substrate, characterized in that: The electrostatic spraying device (4) comprises an electrostatic generator (42), wherein the electrostatic generator (42) is used to charge the viscosity-reducing spray material, so that the charged viscosity-reducing spray material is uniformly attached to the surface of the aerosol-generating substrate after being sprayed; The electrostatic spraying equipment (4) further comprises a spraying room (41) and a storage and feeding device (43). The spraying chamber (41) comprises: an aerosol generating substrate inlet (411), a first spraying chamber (412), a second spraying chamber (413), an air jet channel (414) and a dust collecting channel (415); The storage and supply device (43) is used to transport the viscosity-reducing spray to the spray chamber (41).

2. The electrostatic spraying equipment according to claim 1, characterized in that: The aerosol generating substrate inlet (411) has an atomizing water nozzle (4111), and the atomizing water nozzle (4111) is used to humidify the aerosol generating substrate and increase the adsorption amount of the viscosity reducing spray on the surface of the aerosol generating substrate.

3. The electrostatic spraying equipment according to claim 1, characterized in that: The first spray chamber (412) comprises a first electrode plate (4121) and a first spray gun (4123), one end of the electrostatic generator (42) is connected to the first electrode plate (4121) and the other end is connected to the first spray gun (4123), the first electrode plate (4121) and the first spray gun (4123) are arranged opposite to each other and the aerosol generating matrix passes between the two; The second spraying cabin (413) comprises a second electrode plate (4131) and a second spray gun (4133), one end of the electrostatic generator (42) is connected to the second electrode plate (4131) and the other end is connected to the second spray gun (4133), the second electrode plate (4131) and the second spray gun (4133) are arranged opposite to each other and the aerosol generating matrix passes between the two; The first electrode plate (4121) and the second spray gun (4133) are located on the same side, and the first spray gun (4123) and the second electrode plate (4131) are located on the same side, so that the viscosity-reducing spray can cover at least two directions of the aerosol generating substrate.

4. The electrostatic spraying equipment according to claim 3, characterized in that: The jet passage (414) includes a compressed air inlet (4141) and a compressed air nozzle (4142).

5. The electrostatic spraying equipment according to claim 1, characterized in that: The dust collecting channel (415) comprises a dust collecting strip (4151), a dust collecting chamber (4152) and a dust collecting main pipe (4153); the dust collecting strip (4151) is arranged inside the first spraying chamber (412) and the second spraying chamber (413); the dust collecting strip (4151) and the dust collecting chamber (4152) absorb excess viscosity-reducing spray and collect them in the dust collecting main pipe (4153).

6. The electrostatic spraying equipment according to claim 1, characterized in that: The viscosity-reducing spray comprises one or more microparticles, and the particle size of the microparticles is 100-300 meshes.

7. The electrostatic spraying equipment according to claim 6, characterized in that: The moisture content of the microparticles is 8-10%.

8. The electrostatic spraying equipment according to claim 1, characterized in that: The viscosity reducing spray is tobacco powder, and the sugar content of the tobacco powder is lower than the sugar content of the aerosol generating substrate.

9. An aerosol generating substrate manufacturing system, characterized in that: The invention comprises an electrostatic spraying device as claimed in any one of claims 1 to 8.

10. The aerosol-generating substrate manufacturing system of claim 9, wherein: Also includes: A first rolling device (1) and a first drying device (2) are arranged upstream of the electrostatic spraying device, and a second rolling device (5), a second conveying device (6) and a second drying device (7) are arranged downstream of the electrostatic spraying device, wherein the aerosol generating matrix is ​​a sheet-like aerosol generating matrix, wherein the first rolling device (1) is used to calender the raw material and auxiliary material mixture to form the sheet-like aerosol generating matrix, and the second rolling device (5) is used to increase the bonding strength between the viscosity reducing spray and the sheet-like aerosol generating matrix.

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