A device for reducing the occurrence of dark spots on filter cigarette tipping paper

Abstract

The application discloses a device for reducing dark cigarette of filter cigarette tipping paper, which comprises a transmission shaft, a gas distribution seat sleeved on the transmission shaft, and a closing drum sleeved on the gas distribution seat. The transmission shaft drives the closing drum to rotate. The gas distribution seat comprises a suction area. A plurality of tobacco-accepting grooves, which are in communication with the suction area, are formed in the circumferential direction of the outer wheel surface of the closing drum. A groove is formed between every two adjacent tobacco-accepting grooves. An installation groove is formed in the bottom of the groove. A negative pressure groove body, which penetrates through the wheel body of the closing drum and is in communication with the suction area, is formed in the bottom of the installation groove. A gas distribution block is installed in the installation groove. A tobacco-foam suction hole, which is in communication with the negative pressure groove body, is formed in the gas distribution block. The negative pressure suction force is guided above the movement state of the closing drum through the negative pressure groove body, so that the floating tobacco foam, which is thrown above the closing drum due to centrifugal force, is sucked away. The closing drum of the application has low failure rate and high practicability, prevents the dark cigarette caused by the tobacco foam mixed in the tipping paper, and improves the product qualification rate.

Description

Technical Field

[0001] This invention relates to the field of cigarette equipment, and more specifically to a device for reducing the dark spots on cigarette filters and tipping paper. Background Technology

[0002] The converging drum is a crucial component of the filter cigarette forming system. Driven by the transmission system and the airflow system, it receives short cigarettes from the cigarette supply system, filter tips from the filter supply system, and tipping paper from the tipping paper supply system, bringing them together at the converging drum. The drum's function is to press these three segments together—the short cigarette, the filter tip, and the short cigarette—using the floats on both sides to form a "cigarette assembly," aligning the center of this assembly with the machine's center. The tipping paper supply system then delivers the glued tipping paper, attaching its front end to the assembly, and passes it to the joining drum.

[0003] As the quality requirements for cigarette production processes continue to rise, some shortcomings in the original design of the ZJ17 cigarette making machine have gradually become apparent in cigarette quality. During high-speed operation, after the double-length cigarettes from the cigarette supply system are cut into shorter cigarettes, the tobacco filling at the filter tip (ignition) end falls off due to centrifugal force. This splattered tobacco adheres to the glued tipping paper, and after being twisted together, forms "dark spots" between the tipping paper and the filter tip, severely affecting cigarette quality. This quality problem is an unavoidable defect in the production process and a common and persistent issue with the YJ27 filter tip assembly machine.

[0004] As industry standards for evaluating the quality of cigarette products continue to rise, cigarettes with "dark spots" embedded in the tipping paper of the filter tip are penalized with a deduction of 1.8 points per cigarette, significantly lowering the overall product quality score. (See also...) Fig. 1-2 The "dark spot" in cigarette tipping paper 101 refers to a product quality defect that occurs when the filter tipping machine wraps the short cigarette and filter section with tipping paper 201. This is because small, loosely packed tobacco particles or shreds at the cigarette tip are detached due to centrifugal force as the drums rotate. These particles float between the drums, especially when the tipping paper 201 with adhesive adheres to it enters near the drum 100. At the moment the cigarette and filter section are wrapped, the floating tobacco particles or shreds become trapped between the tipping paper and the filter rod due to centrifugal force. Therefore, we call these tobacco particles, which are wrapped inside the tipping paper 201 and are faintly visible through the paper, "dark spots."

[0005] The original YJ27 filter attaching machine uses a defoaming method where the tipping paper 201 on the tipping drum 200 is cut into tipping paper pieces. As these pieces, adsorbed on the tipping paper cutter wheel 300, are about to enter the approaching drum 100, a blower plate located below the tipping paper cutter guard sprays positive pressure airflow to forcibly change the floating state of the detached tobacco dust or shreds caused by centrifugal force. This causes the dust or shreds to fly away from the trajectory of the tipping paper after gluing, theoretically eliminating the problem of "dark spot" cigarettes when the filter cigarette is wrapped in tipping paper. However, this method of forcibly blowing away floating objects with airflow cannot completely remove all floating objects above the approaching drum 100 according to the ideal airflow direction. Some floating objects will always collide with the obstruction under the airflow and fly around erratically. Therefore, the effect is not ideal, and a new structure for removing floating objects needs to be developed to further reduce the generation of "dark spot" cigarettes. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a device for reducing dark spots on cigarette filter paper. The device aims to promptly remove floating debris that is blown about by the jet airflow above the drum, thereby preventing tobacco dust and other floating debris from being rolled into the tipping paper and forming "dark spots" on the cigarette.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows:

[0008] A device for reducing the dark spots of filter cigarette paper includes a drive shaft, a gas distribution seat sleeved on the drive shaft, and a closing drum sleeved on the gas distribution seat. The drive shaft drives the closing drum to rotate. The gas distribution seat includes a suction area. The outer wheel surface of the closing drum is evenly provided with a plurality of smoke-collecting grooves communicating with the suction area along the circumferential direction to absorb the cigarette.

[0009] A groove is formed between two adjacent smoke-collecting slots. An installation slot is formed at the bottom of the groove. A perforated negative pressure slot is formed at the bottom of the installation slot, penetrating the drum body and communicating with the suction area. An air distribution block is installed in the installation slot. A suction hole is formed on the air distribution block, communicating with the negative pressure slot. The suction hole directs the negative pressure suction force to the area above the drum body in motion through the negative pressure slot, so as to suck away the floating tobacco dust thrown out above the drum body due to centrifugal force.

[0010] As an improvement to the above solution, both ends of the air distribution block are provided with positioning threaded holes, through which the air distribution block is installed in the mounting groove.

[0011] As an improvement to the above solution, the gas distribution block and the mounting groove are sealed with a sealing gasket.

[0012] As an improvement to the above solution, the negative pressure tank is offset relative to the groove in the opposite direction of the drum's rotation to prevent the adsorption hole from communicating with the negative pressure tank. The mounting groove is offset relative to the groove in the opposite direction of the drum's rotation, and the offset distance between the mounting groove and the groove is greater than the offset distance between the negative pressure tank and the groove, so that the freely falling water-soaked paper is far away from the air distribution block in the mounting groove, thereby avoiding the negative pressure in the adsorption hole adsorbing the water-soaked paper.

[0013] As an improvement to the above solution, the foam suction hole is set as an oblique hole, which is inclined upward towards the side opposite to the direction of the drum's rotation, so that the water-absorbing paper after free fall is far away from the foam suction hole, so as to avoid the negative pressure in the foam suction hole adsorbing the water-absorbing paper.

[0014] As an improvement to the above solution, both the mounting groove and the negative pressure groove have waist-shaped cross sections, which facilitates processing and forming.

[0015] As an improvement to the above scheme, the upper end of the gas distribution block is inclined inward to collect the negative pressure gas in the foam suction hole.

[0016] As an improvement to the above solution, floating rings that converge inward at the top are installed on both sides of the adducting drum to press the short cigarette and the filter tip together.

[0017] The beneficial effects of this invention are as follows:

[0018] This application adds a function to the converging drum roller to adsorb tobacco dust above it. Specifically, by adding a negative pressure groove to guide the air intake area in conjunction with the air distribution block, the negative pressure air from the air distribution seat is directed to the area above the converging drum roller, thereby real-time suction and removal of tobacco dust floating above it and being flung off by centrifugal force. This converging drum roller function features a low failure rate, high practicality, and excellent dust suction effect. It can effectively reduce the dark spots in cigarettes caused by tobacco dust trapped in the tipping paper, thus improving the product's yield rate. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Appendix Fig. 1 This is a structural diagram of an existing filter tip assembly machine;

[0021] Appendix Fig. 2 This is a schematic diagram of the existing converging drum structure;

[0022] Appendix Fig. 3 This is an exploded view of the structure of the approaching drum in this application;

[0023] Appendix Fig. 4 This is a schematic diagram of the internal structure of the adducting drum in this application;

[0024] Appendix Fig. 5This is a schematic diagram of the internal structure of the adducting drum in this application;

[0025] Appendix Fig. 6 This is a schematic diagram of the internal structure of the adducting drum in this application;

[0026] Appendix Fig. 7 This is a partial enlarged view of the approaching drum in this application;

[0027] Appendix Fig. 8 This is a schematic diagram of the gas distribution block of this application;

[0028] Appendix Fig. 9 This is a schematic diagram of the sealing gasket structure of this application;

[0029] Appendix Fig. 10 This is an installation diagram of the gas distribution block of this application;

[0030] Appendix Fig. 11 This is a stress analysis diagram of the cork paper in this application;

[0031] Appendix Fig. 12 This is a schematic diagram of the structure of the adjoining drum and the tipping paper in this application.

[0032] In the diagram: 100, original approach drum; 101, cigarette; 102, cigarette receiving groove; 103, float ring; 104, needle strip mounting groove; 200, tipping paper drum; 201, tipping paper; 300, paper cutting blade; 1, approach drum; 11, groove; 12, mounting groove; 121, threaded hole; 122, air distribution block; 1221, foam suction hole; 123, sealing gasket; 13, negative pressure groove; 2, air distribution seat; 21, suction area; 3, drive shaft. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "upper side", "lower side", "upper end", "both ends", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," "link," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Example

[0037] See Fig. 3 A device for reducing the presence of water spots on the filter paper of cigarettes includes a drive shaft 3, a gas distribution seat 2 sleeved on the drive shaft 3, and a closing drum 1 sleeved on the gas distribution seat 2. The drive shaft 3 is fixedly connected to the end of the closing drum 1 to drive the closing drum 1 to rotate, while the gas distribution seat 2 remains stationary. The gas distribution seat 2 includes a suction area 21. Floating rings 103 are installed on both sides of the closing drum 1, which converge inwards from the top end to squeeze the short cigarette and the filter end together, thereby ensuring that the lengths of the inner and outer filter cigarettes 101 are consistent.

[0038] The outer wheel surface of the approach drum 1 is evenly provided with 18 semi-circular smoke-collecting grooves 102 along the circumferential direction. The bottom of each smoke-collecting groove 102 is provided with 8 adsorption holes with unequal spacing that penetrate the wheel body of the approach drum 1. The adsorption holes of the smoke-collecting groove 102 are connected to the air suction zone 21.

[0039] See Fig. 4-5 A square-section groove 11 is formed between two adjacent smoke-collecting grooves 102. The width of the groove 11 is 23mm, and the distance from the bottom of the groove 11 to the center of the drum 1 is 94mm. (See reference...) Fig. 2 In the original structure of the approach drum 100, a needle strip mounting groove 104 was provided between two adjacent smoke receiving grooves 102. A needle strip was installed in the needle strip mounting groove 104. The function of the needle strip was to support the tipping paper 201 sheet with glue and prevent the tipping paper 201 sheet from adhering to the surface of the approach drum 1. In this application, the approach drum 1 has removed the needle strip mounting groove 104 and replaced it with a groove 11, forming an inwardly recessed square groove 11 space, so that the tipping paper 201 does not come into contact with the wheel body of the approach drum 1.

[0040] See Fig. 6-7The bottom of the groove 11 is provided with an installation groove 12. The bottom of the installation groove 12 has a perforated negative pressure groove 13 that penetrates the wheel body of the approach drum 1 and communicates with the suction zone 21. An air distribution block 122 is installed within the installation groove 12. The air distribution block 122 has a suction hole 1221 that communicates with the negative pressure groove 13. The suction hole 1221, through the negative pressure groove 13 communicating with the suction zone 21, directs the negative pressure suction force above the approach drum 1 during its movement, thereby sucking away the floating tobacco dust thrown out above the approach drum 1 due to centrifugal force. Furthermore, a dust removal pipe is provided in the negative pressure system communicating with the suction zone 21 to remove the tobacco dust sucked in by the suction hole 1221 into the dust removal pipe.

[0041] Furthermore, the negative pressure groove 13 is a through-hole with a groove width of 3mm and a center distance of 72mm. The negative pressure groove 13 is offset relative to the groove 11 in the opposite direction to the rotation of the drum 1 (see...). Fig. 1 The drum 1 rotates counterclockwise with the drive shaft 3, while the negative pressure trough 13 is offset clockwise by 5mm to prevent the adsorption holes from communicating with the negative pressure trough 13. The mounting groove 12 is a waist-shaped groove with a width of 10mm, a center distance of 86mm, and a depth of 14mm. The mounting groove 12 is offset by 6cm relative to the groove 11 in the opposite direction of the rotation of the drum 1, and its offset distance relative to the groove 11 is greater than the offset distance of the negative pressure trough 13 relative to the groove 11, so that the freely falling water-soaked paper 201 is away from the air distribution block 122 in the mounting groove 12, so as to avoid the negative pressure in the adsorption hole 1221 adsorbing the water-soaked paper 201.

[0042] Furthermore, the foam suction hole 1221 is set as an oblique hole, which is inclined upward towards the side opposite to the direction of rotation of the drum 1, so that the water-absorbing paper 201 after falling freely is away from the foam suction hole 1221, so as to avoid the negative pressure in the foam suction hole 1221 adsorbing the water-absorbing paper 201.

[0043] See Fig. 8-10 Each end of the mounting groove 12 has a 16mm deep M4 threaded hole 121. The air distribution block 122 is installed in the mounting groove 12 through the threaded hole 121. The air distribution block 122's suction hole 1221 is connected to the negative pressure groove 13 below it. The air distribution block 122 and the mounting groove 12 are sealed by a sealing gasket 123 to prevent negative pressure leakage.

[0044] See Fig. 8 The upper end of the gas distribution block 122 is inclined inward to gather the negative pressure gas in the foam suction hole 1221, which strengthens the negative pressure suction force and makes it easier to suck the tobacco powder into the foam suction hole. At the same time, it prevents the tobacco powder from accumulating on the upper surface of the gas distribution block. The inclined design allows the tobacco powder to slide to the inside and be sucked away by the foam suction hole.

[0045] Furthermore, the air distribution block 122 is configured in two specifications, allowing for the replacement of different specifications of air distribution blocks 122 to accommodate cigarette sticks 101 of different lengths. The length of a standard cigarette stick 101 is 54mm-64mm, while the length of an unconventional cigarette stick 101 is 35mm-45mm. Because the unconventional cigarette stick 101 is shorter, the distance between the two end tips of the stick 101 is larger, resulting in a longer filter tip. The spacing between the left and right holes of the standard cigarette air distribution block 122 cannot meet the distance requirements at the end tips, and the negative pressure suction cannot effectively adsorb tobacco dust. Therefore, replacing the air distribution block 122 can improve the efficiency of tobacco dust extraction.

[0046] The gas distribution block 122 comes in two specifications: a standard type and a non-standard, irregularly shaped type. The standard type is suitable for cigarettes 101 with a length of 54mm-64mm; the non-standard type is suitable for cigarettes 101 with a length of 35mm-45mm. Since the center-to-center distance of the oblong holes in the mounting groove 12 for installing the gas distribution block 122 is 86mm, the center-to-center distance for both types of gas distribution blocks 122 is also 86mm. Each center-to-center point has a cylindrical through-hole, which is used to pass an M4 screw through the cylindrical through-hole to secure the gas distribution block 122 within the mounting groove 12. The thickness of the gas distribution block 122 is 6mm. The standard air distribution block 122 has five 2.5mm diameter oblique holes (foam suction holes 1221). These oblique holes are circular through-holes with an inclination angle of 50 degrees. The spacing between any two through-holes is 15mm, and the center-to-center distance between the two furthest holes is 60mm. The non-standard air distribution block 122 also has five 2.5mm diameter oblique holes. These oblique holes are circular through-holes with an inclination angle of 50 degrees. The spacing between any two through-holes is 20mm, and the center-to-center distance between the two furthest holes is 80mm.

[0047] See Fig. 12 This application verifies that the improved approach drum 1 has good foam suction function through the following device:

[0048] 1. Calculation of unloading air volume

[0049] Total negative pressure air volume: 12000Pa; 5 rows of adsorption holes × 5 = 25 holes; hole diameter φ2.5.

[0050] Bernoulli's equation is:

[0051]

[0052] Where P is the pressure value, and ρ is the air density, which is 1.181 kg / m³ at normal temperature and pressure. 3 V is the gas flow rate, and C is a constant.

[0053] Pipe flow rate:

[0054] Q = Av1 = Av2

[0055] Where A, v1, and v2 represent the adsorption pore area, outlet velocity, and inlet velocity, respectively. The adsorption pore diameter is 2.5 mm.

[0056]

[0057] Applying Bernoulli's equation to the orifice inlet and outlet (P1, ρ1 are the inlet pressure and density, P2, ρ2 are the outlet pressure and density) yields:

[0058]

[0059] Where P1 is the inlet pressure of the small orifice, which was measured to be 1.2 × 10⁻⁶. 4 Pa, P2 is atmospheric pressure 1.01 × 10⁻⁶ 5 Pa.

[0060] From the continuity equation, we know that:

[0061] Q = Av1 = Av2

[0062] v1 = v2

[0063] The formula for calculating the density of air under different air pressures and temperatures is as follows:

[0064]

[0065] Where P1 is the actual pressure, 1.2 × 10⁻⁶. 4 Pa, P2 is standard atmospheric pressure 1.01 × 10⁻⁶. 5 Pa, T is the thermodynamic temperature 273 + 26 = 299

[0066]

[0067] Combining equations (1), (2), and (3), the airflow velocity through the small hole can be obtained as follows:

[0068]

[0069] The flow rate is:

[0070] Q1 = v i A = 41 × 4.906 × 10 -6 =2.01×10 -4 m 3 / s

[0071] Q2 = v1A2 = 41 × 9.424 × 10 -3 =0.386m 3 / s

[0072] X = Q1 / Q2 = 2.01 × 10 -4 / 0.386 = 0.052%

[0073] The leakage flow rate through the adsorption orifice is only 0.052% of the total flow rate, so its impact on the locomotive's total negative pressure is minimal. The negative pressure leakage value will not affect the locomotive's operating status or quality stability.

[0074] 2. Calculation of the influence of suction force of air distribution block suction holes on interference of floating tobacco dust and cork paper.

[0075] (1) Calculation of interference effect of cork paper

[0076] General formula for wind load: F1=A*P*C d

[0077] Where A1 is the area of ​​the object subjected to force, P is the wind pressure, and C is the surface area of ​​the object subjected to force. d This is the drag coefficient;

[0078] A1=L*W=0.029*0.024=6.96×10 -4 m 2

[0079] v=v1*(1-α1)=41*(1-40%)=24.6m 2

[0080]

[0081] According to the references: C d =1.4

[0082] F1 = A1 * P * C d =6.96×10 -4 *0.378*1.4=3.68×10 -4 N

[0083] Weight of a single tipping sheet:

[0084] m1 = 2 × 10 -3 kg

[0085] Centrifugal force formula:

[0086] F2 = am1

[0087] Where a is the centripetal acceleration:

[0088]

[0089] F2 = am １ =19.5×2×10 -3 =3.9×10 -2 N

[0090] See Fig. 11The weight of the cork paper itself:

[0091] F3=m1g=2×10 -3 ×9.8=1.96×10 -2

[0092] Component of the resultant force along the X-axis:

[0093] F x =F2cosα-F1cosβ

[0094] =3.9×10 -2 ×0.4-3.68×10 -4 ×0.25

[0095] =0.94N

[0096] Component of the resultant force along the Y-axis:

[0097] F ｙ = -F3-F2sinα-F1sinβ

[0098] = -1.96 × 10 -2 -3.9×10 -2 ×0.4-3.68×10 -4 ×0.25

[0099] = -3.53 × 10 -2 N

[0100] The components F of centrifugal force, gravity, and wind pressure on the cork paper in the X and Y axes x >0, F ｙ <0 does not affect the normal wrapping of the tipping paper.

[0101] (2) Calculation of suction force for floating tobacco dust

[0102] The average weight of a single tobacco dust particle (m2) is 0.05 g / piece, and the area (A2) is 2 × 10⁻⁶. -6 m 2 .

[0103] F1 = A2 * P * C d =2×10 -6 *0.378*1.4=1.06×10 -6 N

[0104] F2 = am1 = 19.5 × 5 × 10 -2 =0.98N

[0105] F3 = m2g = 5 × 10 -5 ×9.8=4.9×10 -4

[0106] Component of the resultant force along the X-axis:

[0107] F x =F2cosα-F1cosβ

[0108] = 0.98 × 0.4 - 1.06 × 10 -6 ×0.25

[0109] =0.392N

[0110] Component of the resultant force along the Y-axis:

[0111] F y = -F3-F2sinα-F1sinβ

[0112] = -4.9 × 10 -4 -0.98×0.4-1.06×10 -6 ×0.25

[0113] = -0.394N

[0114] The components F of centrifugal force, gravity, and wind pressure acting on floating tobacco dust along the X and Y axes. x >0, F y <0, the resultant force points towards the adsorption pore, which helps to draw out smoke dust.

[0115] In summary, calculations show that the improved suction hole 1221 of the adductor drum 1 in this application has excellent suction function. This function is reliably designed, and the negative pressure air leakage value will not adversely affect the locomotive operation. Locomotives equipped with the adductor drum 1 of this application effectively reduce the number of dark spots in cigarettes caused by tobacco dust trapped in the tipping paper, improve the pass rate of sampled cigarettes, and enhance consumers' smoking experience and acceptance of cigarette products.

[0116] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for reducing the amount of water spots on the filter paper of cigarettes, characterized in that: It includes a drive shaft, a gas distribution seat movably sleeved on the drive shaft, and a closing drum wheel movably sleeved on the gas distribution seat. The drive shaft is fixedly connected to the end of the closing drum wheel to drive the closing drum wheel to rotate. The gas distribution seat includes a suction area. The outer wheel surface of the closing drum wheel is evenly provided with a plurality of smoke-collecting grooves communicating with the suction area along the circumferential direction to absorb cigarettes. A groove is provided between two adjacent smoke receiving slots. A mounting slot is provided at the bottom of the groove. A perforated negative pressure slot is provided at the bottom of the mounting slot, which penetrates the drum body and communicates with the suction area. An air distribution block is installed in the mounting slot. A suction hole is provided on the air distribution block and communicates with the negative pressure slot. The suction hole directs the negative pressure suction force to the area above the drum body in motion through the negative pressure slot, so as to suck away the floating tobacco dust that is thrown out above the drum body due to centrifugal force. The mounting groove is offset relative to the recess in the opposite direction of the drum's rotation, and the offset distance between the mounting groove and the recess is greater than the offset distance between the negative pressure trough and the recess, so that the freely falling cork paper is far away from the air distribution block in the mounting groove. The foam-absorbing hole is set as an oblique hole, which is inclined upward towards the side opposite to the direction of the drum's rotation, so that the water-absorbing paper is away from the foam-absorbing hole after falling freely; The upper end of the gas distribution block is inclined inward to collect the negative pressure gas in the foam suction hole.

2. The device for reducing the dark spots on the filter paper of cigarettes according to claim 1, characterized in that: Both ends of the gas distribution block are provided with positioning threaded holes, and the gas distribution block is installed in the mounting groove through the positioning threaded holes.

3. The device for reducing the dark spots on the filter paper of cigarettes according to claim 1, characterized in that: The gas distribution block and the mounting groove are sealed by a sealing gasket.

4. The device for reducing the dark spots on the filter paper of cigarettes according to claim 1, characterized in that: The negative pressure trough is offset relative to the groove in the opposite direction to the rotation of the drum.

5. The device for reducing the dark spots on the filter paper of cigarettes according to claim 1, characterized in that: Both the mounting groove and the negative pressure groove have waist-shaped cross sections.

6. The device for reducing the dark spots on the filter paper of cigarettes according to claim 1, characterized in that: The two sides of the adducting drum are equipped with float rings that move inward from the top, which are used to squeeze the short cigarette and the filter tip together.

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