Cigarette filter strip surface burr treatment method

Abstract

The invention provides a cigarette filter strip surface burr treatment method which comprises the following steps: S1, feeding a filter strip made of tows into a saturated steam thermal forming module for thermal forming, and enabling the filter strip to reach a thermal forming temperature; s2, the filter strip is fed into a first hot air dehumidification module, and the filter strip is controlled to be cooled to a first dehumidification temperature from the thermal forming temperature; s3, the filter strip is fed into a second hot air dehumidification module, and the filter strip is controlled to be cooled to a second dehumidification temperature from the first dehumidification temperature; and S4, the filter strip at the second dehumidification temperature is treated through a cold dry gas module, and the filter strip is shaped. Through the continuous treatment process, under the synergistic effect of temperature gradient regulation and control, high-speed airflow dehumidification and continuous ironing, the surface defects of the filter strip are effectively improved, the roundness is remarkably improved, meanwhile, the stability of the internal structure is enhanced, and the production requirements of high-quality filter sticks are completely met.

Description

Technical Field

[0001] This application belongs to the field of cigarette filter rod manufacturing, and specifically relates to a method for treating surface burrs on cigarette filter strips. Background Technology

[0002] In the tobacco product manufacturing industry, filter rods are key components for reducing harmful substances in cigarette smoke and improving the smoking experience. Their surface quality and structural stability directly affect product quality and consumer experience. Currently, surface defects are common in filter rod production, such as burrs, lint, and grooves, as well as insufficient roundness. These defects not only affect the consistency of product appearance but may also lead to unstable molding and material waste in subsequent processing.

[0003] In the existing filter rod production process, the temperature of the filter rod after steam thermoforming is relatively high (usually around 120℃). If it is directly put into the low temperature cold drying process (such as a 5℃ cold dry gas environment), the huge temperature difference will cause significant shrinkage stress inside the filter rod, resulting in structural deformation, cracking or aggravation of surface defects, which seriously affects the product qualification rate.

[0004] Meanwhile, traditional heating treatment devices suffer from insufficient temperature control precision. On the one hand, the heat exchange efficiency between the heating components and the temperature control system is low, making it difficult to achieve precise temperature adjustment, resulting in quality deviations in the filter rods due to temperature fluctuations during processing. On the other hand, some heating devices lack gradient temperature control design, failing to achieve gradual temperature transitions according to the needs of different processing stages of the filter rods, further exacerbating the structural stress problem of the filter rods.

[0005] Furthermore, after the filter rods are thermoformed by steam, a large amount of moisture adheres to their surface. Existing dehumidification processes mostly rely on single or inefficient airflow dehumidification methods, which are difficult to remove moisture quickly and thoroughly. Residual moisture not only causes problems such as stickiness and deformation on the filter rod surface, but also affects the effectiveness of subsequent cold drying treatment and reduces the structural stability of the filter rods. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a method for treating burrs on the surface of tobacco filter strips to solve the above-mentioned problems.

[0007] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0008] This application provides a method for removing burrs from the surface of a cigarette filter strip. The method includes: Step S1: feeding the filter strip made of filament bundles into a saturated steam thermoforming module for thermoforming, and bringing the filter strip to the thermoforming temperature; Step S2: feeding the filter strip into a first hot air dehumidification module, and controlling the filter strip to decrease from the thermoforming temperature to the first dehumidification temperature; Step S3: feeding the filter strip into a second hot air dehumidification module, and controlling the filter strip to decrease from the first dehumidification temperature to the second dehumidification temperature; Step S4: processing the filter strip at the second dehumidification temperature through a cold drying gas module to shape the filter strip.

[0009] Furthermore, the thermoforming temperature is 110-115℃, 115-120℃, or 120-125℃; the first dehumidification temperature is 85-90℃, 90-95℃, or 95-98℃; and the second dehumidification temperature is 65-75℃, 75-80℃, or 80-85℃.

[0010] Furthermore, the first dehumidification temperature is 85℃, and the second dehumidification temperature is 65℃.

[0011] Furthermore, both the first and second hot air dehumidification modules integrate heat exchangers and heating cores. The airflow channels inside the heat exchangers are provided with an inner ring circulating heat exchange channel and an outer ring circulating heat exchange channel. The outer ring circulating heat exchange channel preheats and heats the compressed air once, while the inner ring circulating heat exchange channel heats the compressed air a second time. After passing through the outer and inner ring circulating heat exchange channels, the air temperature stabilizes at the preset temperature value of the heat exchanger.

[0012] Furthermore, the heating core contacts the heat exchanger for heat exchange. The temperature range of the heating core is controlled by adjusting the temperature of the heat exchanger. The temperature of the heating core can vary between 70-220℃, and the temperature of the heating core is controlled below 170℃.

[0013] Furthermore, the filament bundle is a diacetate cellulose filament bundle.

[0014] Furthermore, the gas supply pressure is adjusted to control the flow rate of hot air inside the cavities of the first and second hot air dehumidification modules.

[0015] Furthermore, the temperature of the cold dry gas in the cold dry gas module is 0-5℃.

[0016] Further, step S2 includes: step S21: setting the temperature of the first hot air dehumidification module to a first dehumidification temperature; step S22: forming an interference contact between the first hot air dehumidification module and the outer circle of the filter strip; step S23: the filter strip and the first hot air dehumidification module slide relative to each other, causing the filter strip to drop from the thermoforming temperature to the first dehumidification temperature.

[0017] Further, step S4 includes: step S41: passing the filter strip at the second dehumidification temperature through at least two sets of cold-drying gas modules in sequence; step S42: the cold-drying gas modules are arranged circumferentially along the filter strip, and the cold-drying gas from the cold-drying gas modules blows onto the surface of the filter strip to shape it.

[0018] As can be seen from the above technical solution, the advantages and positive effects of the method for treating surface burrs on tobacco filter strips proposed in this application are as follows:

[0019] (1) Significantly improve the surface quality of the filter rod: By heating the inner core and the filter strip through interference contact ironing of the outer circle, combined with gradient temperature control, the defects such as grooves, fly filaments and burrs caused by uneven distribution of filaments on the surface of the filter rod can be effectively eliminated, greatly improving the appearance consistency and surface smoothness of the filter rod, and significantly increasing the roundness of the filter rod.

[0020] (2) Optimize the internal structural stability of the filter rod: The step-down cooling process is adopted to gradually reduce the temperature of the filter rod from the high temperature after steam thermoforming to the temperature before cold drying treatment. This avoids the drastic temperature difference caused by the direct contact of the high temperature filter rod with the low temperature cold dry gas in the traditional process, eliminates the shrinkage stress inside the filter rod from the root, significantly enhances the structural stability of the filter rod, and reduces problems such as deformation and cracking caused by internal stress.

[0021] (3) Improved production efficiency and adaptability: This method is adaptable to higher production speeds and can meet the needs of high-efficiency production. At the same time, through the dual circulation channel design of the heat exchanger, the compressed air temperature is precisely controlled. Combined with the adjustable heat core temperature, it can stably adapt to the production needs of filter rods made of various materials, reducing the equipment adjustment costs and operation difficulties caused by material differences.

[0022] (4) Enhanced equipment operational reliability: The contact-type heat conduction design between the heating core and the heat exchanger achieves efficient thermal balance, reducing temperature fluctuations in the heating core. This reduces aging of the anti-stick coating caused by sudden temperature changes, extends the service life of related components, and lowers the frequency and cost of equipment maintenance. In addition, the high-speed airflow inside the cavity can quickly remove moisture from the surface of the filter rods. Combined with the adjustable air source pressure, this avoids filter rod adhesion and equipment component corrosion caused by residual moisture, improving the stability of continuous equipment operation.

[0023] (5) Reduce production costs: The reduction of the surface defect rate of filter rods directly reduces the scrap rate and saves raw material costs; the extension of equipment maintenance cycle shortens downtime for maintenance and reduces production losses caused by downtime, thus comprehensively improving production efficiency. Attached Figure Description

[0024] The above description of this application and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solutions.

[0025] Figure 1 This is a flowchart of the method for treating surface burrs on tobacco filter strips according to this application;

[0026] Figure 2 This is a schematic diagram of the deployment of the tobacco filter strip forming production line according to the first embodiment;

[0027] Figure 3 This is a schematic diagram of the deployment of the tobacco filter strip forming production line according to the second embodiment;

[0028] Figure 4 This is a structural diagram of the hot air dehumidification module;

[0029] Figure 5 This is a three-dimensional schematic diagram of the second hot air dehumidification module;

[0030] Figure 6 This is a cross-sectional schematic diagram of the second hot air dehumidification module.

[0031] The reference numerals in the attached figures are explained as follows:

[0032] Silk bundle: 100;

[0033] Saturated steam thermoforming module: 200;

[0034] First hot air dehumidification module: 300;

[0035] Second hot air dehumidification module: 400;

[0036] Compressed air inlet: 410;

[0037] Heat exchanger: 420;

[0038] Outer ring circulating heat exchange channel: 421;

[0039] Inner ring circulating heat exchange channel: 422:

[0040] Heat pipe electrode: 423;

[0041] Heated core: 430;

[0042] High-temperature air outlet: 440;

[0043] Filter bar inlet: 450;

[0044] Insulation sleeve: 460;

[0045] Filter bar outlet: 470;

[0046] Front cover: 481;

[0047] Rear end cover: 482;

[0048] Refrigerated dry gas module: 500;

[0049] Molded filter strips: 900. Detailed Implementation

[0050] The detailed features and advantages of this application are described below in the specific embodiments. The content of this description is sufficient to enable any person skilled in the art to understand the technical content of this application and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this application.

[0051] The invention will now be described with reference to the accompanying drawings, in which similar reference numerals denote similar elements. While specific structures and arrangements are discussed, it should be understood that this is done merely for illustrative purposes. Those skilled in the art will recognize that other structures and arrangements can be used without departing from the spirit and scope of the invention. It will be apparent to those skilled in the art that the invention can also be used in a variety of other applications.

[0052] In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined to have the following meanings:

[0053] The singular forms “a” and “the” include their corresponding plural forms. “At least one” means one or more, and “more” means two or more. “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0054] All figures used to represent component amounts, properties (e.g., molecular weight), reaction conditions, etc., should be considered to be modified in all cases by the terms "within the unavoidable margin of error" or "about". Therefore, the numerical values ​​set forth herein are approximate and may vary depending on the desired properties sought to be obtained by the present invention. The principle of equivalents, which is applied to a minimum and not intended to limit the scope of the claims, should be applied, for example, each value should be interpreted at least according to the reported significant digits and by applying conventional rounding techniques.

[0055] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0056] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Unless otherwise indicated, the following abbreviations have the following meanings, and any other abbreviations used herein but not defined have their generally accepted standard meanings:

[0058] All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, and in particular, meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0059] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0060] Those skilled in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they would choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they would choose the references cited in this patent to reasonably interpret the terms; and finally, they would choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by those skilled in the art to reasonably interpret the terms.

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0062] Please refer to Figure 1 and Figure 2 This application provides a method for removing burrs from the surface of a cigarette filter strip. The specific steps of this method are as follows:

[0063] Step S1: The filter strip made of filament bundles is fed into the saturated steam thermoforming module for thermoforming and the filter strips are brought to the thermoforming temperature.

[0064] Among them, the fiber bundle 100 is made of diacetate fiber bundle, which has good formability and adsorption properties and is a commonly used raw material for tobacco filter rod production. Its fiber density and crimp are pretreated to meet the processing requirements of this treatment method.

[0065] Pretreatment stage: After the cellulose acetate bundles are initially rolled into shape by the forming machine, they form continuous filter strips. The filter strips first enter the saturated steam thermoforming module 200.

[0066] Inside this module, the filter strip is encased in a saturated steam environment. The fiber bundles soften and bind together under high temperature, completing the thermoforming process. At this point, the filter strip temperature rises to 120°C, and a small amount of water vapor forms on the surface due to steam condensation.

[0067] The saturated steam thermoforming module 200 provides saturated steam through a steam generator, so that after the filter strip is thermoformed in the module, the temperature is stably maintained at 110-115℃, 115-120℃ or 120-125℃, preferably 120℃. This temperature can ensure that the fiber bundle 100 is fully softened and formed, and will not cause the fiber bundle 100 to degrade due to excessive temperature.

[0068] The production speed is set to 100 meters per minute, which is the highest operating speed adapted to this method. At this speed, the processing efficiency of each module is dynamically matched with the filter rod conveying speed, ensuring that the filter rod can get sufficient processing time in each module.

[0069] Step S2: Send the filter strip into the first hot air dehumidification module and control the filter strip to drop from the thermoforming temperature to the first dehumidification temperature.

[0070] For example, the temperature of the first hot air dehumidification module 300 is set to 85°C. After being heated in stages by the outer and inner ring circulating heat exchange channels, the temperature fluctuation range of the compressed air is controlled within ±1°C. The heating core is heated by contact heat exchange with the heat exchanger, and the temperature is synchronously stabilized at about 85°C. This temperature can effectively remove moisture from the surface of the filter strip and smooth the surface of the fiber bundle through ironing.

[0071] Step S2 includes:

[0072] Step S21: Set the temperature of the first hot air dehumidification module to the first dehumidification temperature.

[0073] Step S22: Make interference contact between the first hot air dehumidification module and the outer circle of the filter strip.

[0074] Step S23: The filter strip slides relative to the first hot air dehumidification module, causing the filter strip to drop from the thermoforming temperature to the first dehumidification temperature.

[0075] The first stage of hot air dehumidification and ironing: The thermoformed filter strips are smoothly fed into the first hot air dehumidification module 300 by the conveyor wheel. After the filter strips enter the module cavity, they first come into contact with a high-speed hot airflow of 85°C. The airflow flows along the axial direction of the filter strips, quickly carrying away the water vapor adhering to the surface, while preheating and balancing the inside of the filter strips.

[0076] At the same time, the heated inner core, whose temperature is stabilized at 85℃, forms an interference contact with the outer circle of the filter strip. During the high-speed movement of the filter strip, the outer surface of its outer circle slides relative to the outer surface of the heated inner core, which is equivalent to continuous outer circle ironing. This causes the fiber bundles to rearrange under the action of heat, fill the surface grooves, and suppress the generation of fly filaments. During this process, the temperature of the filter strip gradually drops to 85℃.

[0077] Step S3: Send the filter strip into the second hot air dehumidification module and control the filter strip to drop from the first dehumidification temperature to the second dehumidification temperature.

[0078] The temperature of the second hot air dehumidification module 400 is set to 65℃. After the compressed air is heated twice, the temperature is stabilized at 65℃. The temperature of the heating core drops to 65℃ synchronously with the heat exchanger, forming a stepped cooling gradient from 120℃ to 85℃ and then to 65℃.

[0079] The second stage of hot air dehumidification and shaping: The filter strips processed by the first hot air dehumidification module 300 enter the second hot air dehumidification module 400, where the 65°C hot airflow continues to deeply dehumidify the surface of the filter strips, further reducing the moisture content of the filter strips.

[0080] The inner core is heated to 65°C to iron the filter strip a second time. At this time, the temperature of the filter strip has dropped to 65°C, and the plasticity of the fiber is weakened. Ironing can fix the surface shape that has been formed, and at the same time further correct the roundness deviation of the filter strip.

[0081] Step S4: The filter strips at the second dehumidification temperature are processed by the cold drying gas module to shape the filter strips.

[0082] Cold air that has undergone freeze-drying is introduced and the temperature is set to 5°C for final shaping of the filter rod.

[0083] It is understandable that both the first hot air dehumidification module 300 and the second hot air dehumidification module 400 are equipped with airflow speed sensors inside their cavities. By adjusting the air supply pressure, the hot air flow speed inside the cavity is kept stable at 12 m / s.

[0084] The airflow impact force generated by this flow rate is sufficient to remove most of the moisture remaining on the surface of the filter strip due to steam forming, while the filter strip will not shift or deform due to excessive flow rate.

[0085] Step S4 includes:

[0086] Step S41: Pass the filter strips at the second dehumidification temperature through at least two sets of cold dry gas modules in sequence.

[0087] Step S42: The cold-drying gas module is set along the circumference of the filter strip, and the cold-drying gas from the cold-drying gas module is blown onto the surface of the filter strip to shape the filter strip.

[0088] like Figure 3 As shown, during the cold drying and shaping stage, the filter strips output from the second hot air dehumidification module 400 pass through four sets of cold drying gas modules 500 in sequence. Cold drying gas at 5°C is blown evenly from all sides onto the surface of the filter strips, causing the filter strip temperature to drop rapidly to room temperature, thus completing the final shaping.

[0089] Because the filter strip undergoes a stepped cooling process, the internal shrinkage stress caused by sudden cooling in traditional processes is avoided, ensuring the stability of the filter strip's internal structure.

[0090] It is understandable that through the above continuous processing, the surface defects of the filter strip are effectively improved and the roundness is significantly enhanced under the synergistic effect of temperature gradient control, high-speed airflow dehumidification and continuous ironing.

[0091] At the same time, the internal structural stability is enhanced, fully meeting the production requirements of high-quality filter rods.

[0092] Specifically, the equipment used in this treatment method is arranged sequentially along the filter rod conveying path, including a saturated steam thermoforming module 200, a first hot air dehumidification module 300, a second hot air dehumidification module 400, and four sets of cold dry gas modules 500. The spacing between adjacent modules is controlled at 40mm to ensure that the filter rod is subjected to uniform force during the conveying process and to avoid shaking or stretching deformation caused by excessive spacing.

[0093] The fiber bundle 100 passes sequentially through a saturated steam thermoforming module 200, a first hot air dehumidification module 300, and a second hot air dehumidification module 400, and then sequentially through four sets of cold-drying gas modules 500 to complete the deburring of the filter rod surface. The forming fiber bundle 100 uses diacetate fiber bundles, and the maximum production speed suitable for this method is 100 meters per minute.

[0094] Please refer to Figures 4 to 6 The first hot air dehumidification module 300 and the second hot air dehumidification module 400 both integrate a heat exchanger 420 and a heating core 430. The airflow channel inside the heat exchanger 420 is provided with an inner ring circulating heat exchange channel 422 and an outer ring circulating heat exchange channel 421.

[0095] Air enters the hot air dehumidification module through the compressed air inlet 410. The outer ring circulating heat exchange channel 421 preheats and heats the compressed air once, while the inner ring circulating heat exchange channel 422 heats the compressed air a second time. After circulating through the outer and inner ring heat exchange channels 422, the air temperature stabilizes at the preset temperature value of the heat exchanger 420.

[0096] Specifically, the first hot air dehumidification module 300 and the second hot air dehumidification module 400 have the same structure, both integrating a set of high-efficiency heat exchangers 420 and a heating core 430. The heat exchanger 420 adopts a double-layer circulation channel design, including an outer ring circulation heat exchange channel 421 and an inner ring circulation heat exchange channel 422.

[0097] The distance between the first hot air dehumidification module 300 and the second hot air dehumidification module 400 is 40mm. The first dehumidification temperature is 85-90℃, 90-95℃ or 95-98℃, and the second dehumidification temperature is 65-75℃, 75-80℃ or 80-85℃.

[0098] The inlet of the outer ring circulating heat exchange channel 421 is connected to the compressed air source to achieve preheating and primary heating of the compressed air; the inner ring circulating heat exchange channel 422 is nested in the outer ring channel, and the channel wall is made of a metal material with a high thermal conductivity, which is used to perform secondary heating on the compressed air after it has been processed by the outer ring channel, so that the temperature of the compressed air is stabilized at the set value of the heat exchanger 420.

[0099] The heating core 430 has a cylindrical structure and its outer surface is coated with a high-temperature resistant and non-stick coating. One end of the core is in contact with the output end of the heat exchanger 420. The outer diameter of the heating core 430 is slightly larger than the standard diameter of the filter strip, forming an interference fit to ensure that the filter strip maintains full contact with the outer surface of the heating core 430 during high-speed movement.

[0100] It is understandable that the heating core 430 and the heat exchanger 420 are closely connected by contact, and the two achieve an efficient heat conduction process through direct contact, and finally reach a thermal equilibrium state.

[0101] The heated inner core 430, in a state of thermal equilibrium, makes interference fit contact with the filter bar. During continuous production operation, as the filter bar moves, it is subjected to the "ironing" treatment of its outer circumference by the heated inner core 430. This treatment method can effectively reduce quality defects such as grooves and filaments on the surface of the filter bar, while significantly improving the roundness index of the filter bar.

[0102] It is understandable that the first hot air dehumidification module 300 and the second hot air dehumidification module 400 have similar structures. Taking the second hot air dehumidification module 400 as an example, the second hot air dehumidification module 400 has a filter strip inlet 450 and a filter strip outlet 470 for the filter strip to enter and exit. After the filter strip enters from the filter strip inlet 450, the high-temperature ironing mechanism 400 can perform surface deburring treatment on it. The surface quality and roundness of the filter strip coming out from the filter strip inlet 450 will be significantly improved.

[0103] The main structure of the high-temperature ironing mechanism 400 consists of a heat exchanger 420, a heating core 430, a heat insulation tube 460, and a front cover 481 and a rear cover 482 for assembling the above structures. These structures form a modular whole and work together to complete the surface treatment of the filter strip.

[0104] The heating core 430 has a circular channel in the middle that coaxially connects to the filter strip inlet 450. The diameter of the circular channel is determined according to the diameter of the filter strip, achieving a proper interference fit with the filter rod. The heating core 430 has several through holes on its sidewalls serving as high-temperature air outlets 440. These through holes are arranged in one or more rows in a circumferential array. The number, shape, direction, and diameter of the through holes can be precisely calculated using simulation technology based on the characteristics of the fiber bundle material and the surface quality requirements of the filter strip, thereby ensuring that hot air acts uniformly on the filter strip surface at a suitable speed and pressure.

[0105] The rear end of the heating core 430 is connected to the heat insulation sleeve 460. The heat insulation sleeve 460 has good thermal conductivity and excellent high-temperature resistance of its internal channels. In one specific embodiment, the heat insulation sleeve 460 is made of polytetrafluoroethylene (PTFE), which not only has excellent thermal insulation properties but also good anti-sticking properties. The inner diameter of the heat insulation sleeve 460 is slightly larger than the inner diameter of the heating core 430 to allow the filter strip to return to its preset diameter.

[0106] The heat exchanger 420 is fitted outside the insulation jacket and the heating core. The heat exchanger 420 has one or more heaters (heat pipes) inside. The heat pipe electrodes 423 of the heat pipes are connected to the control system. The heat pipes can measure the temperature by resistance detection. Alternatively, one or more thermocouples can be installed inside the heat exchanger 420 to achieve uniform heating and precise temperature control.

[0107] The heat exchanger 420 includes an outer ring circulating heat exchange channel 421 and an inner ring circulating heat exchange channel 422. The front end of the outer ring circulating heat exchange channel 421 is connected to the compressed air inlet 410, matching a common compressed air supply pipeline. The outer ring circulating heat exchange channel 421 flows circumferentially and extends from front to back within the relatively outer portion of the heat exchanger 420, thereby preheating the compressed air; the rear end of the outer ring circulating heat exchange channel 421 is connected to the rear end of the inner ring circulating heat exchange channel 422. The inner ring circulating heat exchange channel 422 flows circumferentially and extends from back to front within the relatively inner portion of the heat exchanger 420, thereby further heating the compressed air; the other end of the inner ring circulating heat exchange channel 422 is connected to the high-temperature air outlet 440 on the heating inner core 430. In this embodiment, both the outer ring circulating heat exchange channel 421 and the inner ring circulating heat exchange channel 422 adopt a reciprocating rotating structure, which helps to achieve uniform heating and flow stability of the air. In another embodiment, both the outer ring circulating heat exchange channel 421 and the inner ring circulating heat exchange channel 422 adopt a spiral rotation structure.

[0108] Finally, using the cold and dry gas generated by the cold and dry gas module 500, the gas is precisely blown onto the surface of the filter strip. The properties of the cold and dry gas are used to shape the filter strip, ultimately obtaining the molded filter strip 900.

[0109] Through the above continuous processing, the surface defects of the filter bar are effectively improved and the roundness is significantly enhanced under the synergistic effect of temperature gradient control, high-speed airflow dehumidification and continuous ironing. At the same time, the internal structural stability is enhanced, which fully meets the production requirements of high-quality filter rods.

[0110] It should be noted that the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0111] In this specification, references to "an embodiment" or "a specific implementation" mean that a particular feature, structure, or characteristic described in connection with that embodiment / specific implementation is included in at least one embodiment / specific implementation of the invention. Therefore, the phrase "in one embodiment / specific implementation" appearing in various places in this specification does not necessarily refer to the same embodiment / setting, but rather to potentially different embodiments. Furthermore, specific features, structures, or characteristics may be combined in one or more embodiments / settings in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0112] Similarly, it should be understood that in the above description of exemplary embodiments / specific implementations of the present invention, various features of the invention are sometimes combined together in a single embodiment / specific implementation or its figures and descriptions, with the aim of simplifying the disclosure and aiding in the understanding of one or more of the various aspects of the invention.

[0113] However, except where explicitly stated otherwise or where there is an obvious technical contradiction or exclusion, the descriptive method of this patent should not be construed as reflecting an intention to claim more features than are explicitly stated in each claim. Rather, the inventive aspect reflected in the claims lies in not all features of the individual foregoing disclosed embodiments / specific implementations.

[0114] Therefore, the claims following the detailed description are expressly incorporated herein, and each claim exists independently as a separate embodiment / specific implementation of the invention.

[0115] Furthermore, while some embodiments / specific implementations described herein include, but are not limited to, other features included in other embodiments / specific implementations, combinations of features from different embodiments / specific implementations are intended to be within the scope of the invention and form different embodiments / specific implementations, as will be understood by those skilled in the art. For example, in the following claims, embodiments / specific implementations of any claim can be used in any combination.

[0116] The terms and expressions used in this specification are for illustrative purposes and not for limitation. In using these terms and expressions, it is not intended to exclude any equivalents of the features or portions thereof shown and described, but rather to recognize that various modifications may be possible within the scope of the invention.

[0117] Therefore, it should be understood that although the invention has been specifically disclosed through preferred embodiments, exemplary embodiments and optional features, those skilled in the art may take variations or modifications of the concepts disclosed herein, and such variations and modifications are therefore considered to be within the scope of the invention as defined by the appended claims.

[0118] The specific embodiments given in this specification are examples of useful implementations of the present invention. It will be apparent to those skilled in the art that the present invention can be implemented using many variations of the devices, device components, and method steps disclosed in this specification.

[0119] The foregoing description of specific embodiments fully discloses the general features of the present invention, enabling others to easily modify and / or adapt such specific embodiments for various applications by applying knowledge within the scope of the art, without conducting excessive experimentation and without departing from the general concept of the present invention.

[0120] Therefore, based on the teachings and guidance provided herein, it is intended that such modifications and alterations be included within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and is not intended to be limiting; thus, the wording or terminology in this specification will be interpreted by those skilled in the art based on the foregoing teachings and guidance.

[0121] Furthermore, the scope of the invention should not be limited to any of the exemplary embodiments described above, but only to the appended claims and their equivalents.

Claims

1. A method for treating burrs on the surface of a tobacco filter strip, characterized in that, The method for removing burrs from the surface of the cigarette filter strip includes: Step S1: The filter strip made of filament bundle is fed into the saturated steam thermoforming module for thermoforming, and the filter strip reaches the thermoforming temperature; Step S2: Send the filter strip into the first hot air dehumidification module and control the filter strip to drop from the thermoforming temperature to the first dehumidification temperature; Step S3: Send the filter strip into the second hot air dehumidification module and control the filter strip to drop from the first dehumidification temperature to the second dehumidification temperature; Step S4: The filter strip at the second dehumidification temperature is processed by the cold drying gas module to shape the filter strip.

2. The method for treating burrs on the surface of tobacco filter strips according to claim 1, characterized in that, The thermoforming temperature is 110-115℃, 115-120℃, or 120-125℃. The first dehumidification temperature is 85-90℃, 90-95℃, or 95-98℃; The second dehumidification temperature is 65-75℃, 75-80℃, or 80-85℃.

3. The method for treating burrs on the surface of tobacco filter strips according to claim 1, characterized in that, The first dehumidification temperature is 85℃, and the second dehumidification temperature is 65℃.

4. The method for treating burrs on the surface of tobacco filter strips according to claim 1, characterized in that, Both the first and second hot air dehumidification modules integrate heat exchangers and heating cores. The airflow channels within the heat exchangers are configured with an inner and an outer circulating heat exchange channel. The outer ring circulating heat exchange channel preheats and heats the compressed air initially, while the inner ring circulating heat exchange channel heats the compressed air a second time. After passing through the outer and inner ring circulating heat exchange channels, the air temperature stabilizes at the preset temperature value of the heat exchanger.

5. The method for treating burrs on the surface of a tobacco filter strip according to claim 4, characterized in that, The heating core exchanges heat with the heat exchanger through contact. The temperature range of the heating core is controlled by adjusting the temperature of the heat exchanger. The temperature of the heating core can vary between 70-220°C, and the temperature of the heating core is controlled below 170°C.

6. The method for treating burrs on the surface of a tobacco filter strip according to claim 1, characterized in that, The filament bundle is a cellulose diacetate filament bundle.

7. The method for treating burrs on the surface of tobacco filter strips according to claim 1, characterized in that, Adjusting the air supply pressure controls the flow rate of hot air inside the cavities of the first and second hot air dehumidification modules.

8. The method for treating burrs on the surface of tobacco filter strips according to claim 1, characterized in that, The temperature of the cold-dry gas in the cold-dry gas module is 0-5℃.

9. The method for treating burrs on the surface of a tobacco filter strip according to claim 1, characterized in that, Step S2 includes: Step S21: The temperature of the first hot air dehumidification module is set to the first dehumidification temperature; Step S22: Make an interference fit between the first hot air dehumidification module and the outer circle of the filter strip; Step S23: The filter strip slides relative to the first hot air dehumidification module, causing the filter strip to drop from the thermoforming temperature to the first dehumidification temperature.

10. The method for treating burrs on the surface of a tobacco filter strip according to claim 1, characterized in that, Step S4 includes: Step S41: Pass the filter strip at the second dehumidification temperature through at least two sets of cold dry gas modules in sequence; Step S42: The cold-drying gas module is arranged circumferentially along the filter strip, and the cold-drying gas from the cold-drying gas module is blown onto the surface of the filter strip to shape the filter strip.

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