A method for adjusting the draw resistance stability of a filter rod

Abstract

The application discloses a method for adjusting the stability of the suction resistance of filter rods, and is used for adjusting the stability of the suction resistance of filter rods produced by a filter rod forming machine. The filter rod forming machine is provided with an input roller and an opening roller in sequence along the running direction of the tow. The circumferential surfaces of the input roller and the opening roller are in contact with the tow. The adjusting method comprises the following steps: checking the opening degree of the tow in the filter rods produced by the filter rod forming machine; if the opening degree of the tow is insufficient, increasing the roller speed ratio of the opening roller to the input roller on the basis of a first reference roller speed ratio; if the opening degree of the tow is excessive, decreasing the roller speed ratio of the opening roller to the input roller on the basis of the first reference roller speed ratio; wherein the first reference roller speed ratio is the reference value of the roller speed ratio of the opening roller to the input roller. The application can adjust the roller speed ratio of each roller in the filter rod forming machine according to the actual production situation, thereby effectively improving the stability of the suction resistance of the filter rods, and is convenient to operate, time-saving and labor-saving.

Description

Technical Field

[0001] This invention relates to the field of tobacco filter rod processing technology, and in particular to a method for adjusting the draw resistance stability of a filter rod. Background Technology

[0002] Cigarette filters have a certain filtering effect on particulate matter in cigarette smoke, partially removing certain components such as tar and nicotine, thus reducing harmful substances in the smoke and alleviating the conflict between smoking and health. Furthermore, when the average draw resistance of the filter is relatively stable, the magnitude of its draw resistance deviation directly affects the draw resistance deviation of the cigarette, and consequently, the stability of the cigarette's smoke indicators, thus impacting the consumer's smoking experience.

[0003] Filter rods are made by a filter rod forming machine, the structure of which is as follows: Figure 2 As shown, the fiber bundle 1 is drawn from the fiber bundle package, passes through the guide ring and enters the primary air opener 5. Most of the fluctuations are eliminated at the primary air opener 5. It then sequentially enters the secondary air opener 6, brake roller 8, input roller 2, and opening roller 3. The fiber bundle 1 is further opened using the roller speed difference. It then passes through the tertiary air opener 7 and is treated with glycerin. Afterwards, it is relaxed at the relaxation roller 4 and then enters the high-pressure nozzle 9 to reach the smoke gun for wrapping and shaping, forming a filter rod. The suction resistance stability of the filter rod is related to the roller speed ratio between the rollers, and the degree to which the roller speed ratio affects the suction resistance stability of the filter rod varies with the wear of each roller and the amount of fiber fed into the filter.

[0004] In existing technologies, although gradient experiments and orthogonal experiments can be used to determine the optimal value of each roller speed ratio, these experiments can only represent data from the experimental stage and cannot adjust the roller speed ratio in real time according to the wear state of the equipment and the condition of the incoming filament in actual production. Therefore, the filter rod suction resistance stability is poor. In addition, these methods are time-consuming and labor-intensive, and the experimental cycle is long. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that it is currently impossible to accurately and quickly obtain the optimal values ​​of the roller speed ratios in a filter rod forming machine based on actual production conditions, resulting in poor suction resistance stability and wasted manpower in the produced filter rods. This invention provides a method for adjusting the suction resistance stability of filter rods. The method allows for adjustment of the roller speed ratios in the filter rod forming machine according to actual production conditions, thereby effectively improving the suction resistance stability of the filter rods. Furthermore, it is convenient to operate and saves time and effort.

[0006] To address the aforementioned technical problems, embodiments of the present invention disclose a method for adjusting the suction resistance stability of filter rods, used to adjust the suction resistance stability of filter rods produced by a filter rod forming machine. Along the running direction of the filament bundle, the filter rod forming machine is sequentially equipped with an input roller and an opening roller, the circumferential surfaces of which are in contact with the filament bundle. The adjustment method includes:

[0007] Inspect the openness of the filament bundles in the filter rods produced by the filter rod forming machine;

[0008] If the opening degree of the filament bundle is insufficient, the speed ratio between the opening roller and the input roller shall be increased based on the first reference roller speed ratio.

[0009] If the opening of the filament bundle is excessive, the speed ratio between the opening roller and the input roller shall be reduced based on the first reference roller speed ratio.

[0010] The first reference roll speed ratio is the reference value of the roll speed ratio between the opening roll and the input roll.

[0011] By adopting the above technical solution, the speed ratio of the opening roller to the input roller is adjusted according to the opening state of the filament bundle. The method is simple, highly accurate, and can improve the stability of the filter rod's suction resistance. It can also avoid the large amount of additional data detection generated by gradient experiments and orthogonal experiments. The operation is convenient and saves time and effort.

[0012] Optionally, the first reference roll speed ratio is 1.25-1.5.

[0013] Optionally, the inspection of the openness of the filament bundles in the filter rods produced by the filter rod forming machine includes:

[0014] Within 30 seconds after the filter rod is produced, tear off the forming paper on the surface of the filter rod and determine whether the volume of the filament bundle inside the filter rod expands to more than 3-5 times its original volume after the forming paper is removed.

[0015] If not, the looseness of the filament bundle is deemed insufficient.

[0016] Optionally, inspecting the openness of the filament bundles in the filter rods produced by the filter rod forming machine also includes:

[0017] Within 30 seconds of the filter rod being produced, tear off the forming paper on the surface of the filter rod, gently pull the filament bundle to make the width of the filament bundle 7-8 times its original width, and check whether there are any broken filaments in the filament bundle.

[0018] If so, the looseness of the filament bundle is determined to be excessive;

[0019] If not, loosen the filament bundle and determine whether the amount of retraction of the filament bundle along its width direction after the tension is lost is greater than or equal to 60% of the width dimension of the filament bundle after it is pulled apart.

[0020] If not, then the looseness of the filament bundle is determined to be excessive.

[0021] Optionally, the filter rod forming machine also includes a relaxation roller, which is located downstream of the opening roller along the running direction of the filament bundle, and the circumferential surface of the relaxation roller is in contact with the filament bundle; the adjustment method also includes: while increasing the roller speed ratio between the opening roller and the input roller, decreasing the roller speed ratio between the relaxation roller and the opening roller.

[0022] When the opening degree of the filament bundle is insufficient, increasing the speed ratio between the opening roller and the input roller can narrow the filament bundle at the upstream end of the opening roller, which is beneficial for opening. Simultaneously, decreasing the speed ratio between the releasing roller and the opening roller can widen the filament bundle at the downstream end of the opening roller, giving the filament bundle curl recovery properties. Using this technical solution, the width of the filament bundle narrows before passing through the opening roller and widens again after passing through it, thus avoiding insufficient opening degree of the filament bundle while ensuring its curl recovery properties; furthermore, it can ensure that the amount of plasticizers such as glycerin applied remains constant.

[0023] Optionally, if the opening degree of the filament bundle is insufficient, and excessive opening of the filament bundle occurs during the process of increasing the speed ratio between the opening roller and the input roller, then the pressure applied to the filament bundle by the opening roller is slightly reduced based on the reference pressure value of the opening roller, and the speed ratio between the opening roller and the input roller is slightly increased; wherein, the reference pressure value of the opening roller is the reference value of the pressure applied to the filament bundle by the opening roller.

[0024] Optionally, when slightly reducing the pressure applied to the yarn bundle by the opening roller, the pressure applied to the yarn bundle by the opening roller is reduced in multiple stages, each time by 0.02 MPa; when slightly increasing the speed ratio between the opening roller and the input roller, the speed ratio between the opening roller and the input roller is increased in multiple stages, each time by less than or equal to 0.01.

[0025] Optionally, while reducing the speed ratio between the opening roll and the input roll, the speed ratio between the relaxation roll and the opening roll can be increased.

[0026] When the opening and loosening of the filament bundle is excessive, reducing the speed ratio between the opening roller and the input roller can widen the filament bundle upstream of the opening roller, preventing excessive opening and loosening. Simultaneously, increasing the speed ratio between the loosening roller and the opening roller can narrow the filament bundle downstream of the opening roller, keeping the bundle width essentially constant. By employing this technical solution, the filament bundle widens before passing through the opening roller and narrows again afterward, thus avoiding excessive opening and loosening while ensuring a consistent application rate of plasticizers such as glycerin.

[0027] Optionally, if the opening looseness of the filament bundle is excessive, and insufficient opening looseness occurs during the process of reducing the speed ratio between the opening roller and the input roller, then based on the reference pressure value of the opening roller, the pressure applied to the filament bundle by the opening roller is slightly increased, and the speed ratio between the opening roller and the input roller is slightly decreased; wherein, the reference pressure value of the opening roller is the reference value of the pressure applied to the filament bundle by the opening roller.

[0028] Optionally, when slightly increasing the pressure applied to the yarn bundle by the opening roller, the pressure applied to the yarn bundle by the opening roller is increased multiple times, with each increase being 0.02 MPa; when slightly decreasing the speed ratio between the opening roller and the input roller, the speed ratio between the opening roller and the input roller is decreased multiple times, with each decrease being less than or equal to 0.01.

[0029] Optionally, the reference pressure value of the opening roller is 0.18-0.25 MPa.

[0030] Optionally, the filter rod forming machine further includes: a primary air opener, a secondary air opener, and a tertiary air opener. The primary and secondary air openers are located upstream of the input roller along the direction of the filament bundle's movement, while the tertiary air opener is located between the opening roller and the releasing roller. When the filament bundle is replaced, the width of the filament bundles output from the previous and subsequent bundles after passing through the tertiary air opener is compared. If the width of the filament bundle output from the subsequent bundle is less than the width of the filament bundle output from the previous bundle, the speed ratio between the releasing roller and the opening roller is reduced by 0.01-0.06. If the width of the filament bundle output from the subsequent bundle is greater than the width of the filament bundle output from the previous bundle, the speed ratio between the releasing roller and the opening roller is increased by 0.01-0.06.

[0031] By adopting the above technical solution, the suction resistance of the filter rod can be adjusted according to the different raw materials of the fiber bundle when changing the fiber bundle package, thereby avoiding poor suction resistance stability of the filter rod caused by different raw materials of the fiber bundle.

[0032] Optionally, the filter rod forming machine also includes a brake roller, which is located upstream of the input roller along the running direction of the filament bundle. The circumferential surface of the brake roller is in contact with the filament bundle. The adjustment method further includes: taking five groups of filter rods produced by the filter rod forming machine, each group containing 30 filter rods, and detecting the suction resistance value of each filter rod. The average suction resistance value of the 30 filter rods in the same group is taken as the average suction resistance value of the group. Then, the maximum suction resistance value in the group is subtracted from the average suction resistance value of the group to obtain the first count value, and the average suction resistance value of the group is subtracted from the minimum suction resistance value in the group to obtain the second count value. If, in at least three groups, the difference between the first and second count values ​​exceeds 40 Pa, the pressure applied to the yarn by the brake roller is increased by 0.01-0.03 bar based on the brake roller's reference pressure value; if, in at least three groups, the difference between the second and first count values ​​exceeds 40 Pa, the pressure applied to the yarn by the brake roller is decreased by 0.01-0.03 bar based on the brake roller's reference pressure value; wherein, the brake roller's reference pressure value is the reference value of the pressure applied to the yarn by the brake roller.

[0033] When the pressure applied to the fiber bundle by the brake roller increases, the average suction resistance decreases. At this time, the weight of the filter rod should be increased accordingly to ensure that the average suction resistance of the filter rod remains unchanged. When the pressure applied to the fiber bundle by the brake roller decreases, the average suction resistance increases. At this time, the weight of the filter rod should be decreased accordingly to ensure that the average suction resistance of the filter rod remains unchanged.

[0034] Optionally, the reference pressure value of the brake roller is 0.4-0.6 bar.

[0035] Optionally, it further includes: if the difference between the first count value and the second count value does not exceed ±40Pa, and both the first count value and the second count value are less than 110Pa, then the speed ratio between the opening roll and the input roll is determined to be the optimal value, and there is no need to manually adjust the speed ratio between the opening roll and the input roll.

[0036] Optionally, the filter rod forming machine also includes a high-pressure nozzle. Along the running direction of the filament bundle, the high-pressure nozzle is located at the downstream end of the loosening roller. After the roller speed ratio between the loosening roller and the input roller is adjusted to the optimal value, the air pressure of the high-pressure nozzle is increased based on the reference air pressure percentage of the high-pressure nozzle until the filament bundle is straightened. Then, the air pressure of the high-pressure nozzle is reduced until the filament bundle begins to vibrate. Finally, the air pressure of the high-pressure nozzle is increased by 1%-4% so that the filament bundle just stops vibrating.

[0037] By adopting the above technical solution, it is possible to prevent the filament bundle from coming into violent contact with the baffle on the filter rod forming machine, thereby avoiding additional resistance to the filament bundle before it enters the high-pressure nozzle after being loosened.

[0038] Optionally, the reference air pressure percentage for the high-pressure nozzle is 45%-70%.

[0039] Optionally, before adjusting the speed ratio between the opening roller and the input roller, the method further includes: adjusting the air pressure of the primary air opener to 130 mbar, the air pressure of the secondary air opener to 110 mbar, the air pressure of the tertiary air opener to 50 mbar, and adjusting the pressure applied to the yarn bundle by the input roller to 0.18-0.25 MPa.

[0040] Optionally, before adjusting the speed ratio between the opening roller and the input roller, the process also includes: removing the glue residue inside and outside the high-pressure nozzle, removing the fly shavings inside the filter rod forming machine, and cleaning the gap between the opening plates of the primary air opener, the secondary air opener, and the tertiary air opener. Attached Figure Description

[0041] Figure 1 A flowchart illustrating the method for adjusting the suction resistance stability of a filter rod according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram of the filter rod forming machine is shown.

[0043] Reference numerals: 1. filament bundle; 2. input roller; 3. opening roller; 4. release roller; 5. primary air opener; 6. secondary air opener; 7. tertiary air opener; 8. brake roller; 9. high-pressure nozzle. Detailed Implementation

[0044] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0045] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a method for adjusting the suction resistance stability of a filter rod, used to adjust the suction resistance stability of filter rods produced by a filter rod forming machine, along the running direction of the filament bundle 1 (e.g., Figure 2 (The arrow in the image indicates the direction). The filter rod forming machine is equipped with an input roller 2 and an opening roller 3 in sequence. The circumferential surfaces of both the input roller 2 and the opening roller 3 are in contact with the filament bundle 1. The adjustment method includes:

[0049] Step S1: Inspect the openness of the filament bundle 1 in the filter rods produced by the filter rod forming machine;

[0050] Step S2: If the opening degree of the filament bundle 1 is insufficient, increase the speed ratio between the opening roller 3 and the input roller 2 based on the first reference roller speed ratio;

[0051] Step S3: If the opening looseness of the filament bundle 1 is excessive, then reduce the speed ratio between the opening roller 3 and the input roller 2 based on the first reference roller speed ratio;

[0052] The first reference roll speed ratio is the reference value of the roll speed ratio between the opening roll 3 and the input roll 2; specifically, the first reference roll speed ratio can be 1.25-1.5.

[0053] By adopting the above technical solution, the speed ratio of the opening roller 3 to the input roller 2 is adjusted according to the opening state of the filament bundle 1. The method is simple, accurate, and can improve the stability of the filter rod's suction resistance. It can also avoid the large amount of additional data detection generated by gradient experiments and orthogonal experiments. The operation is convenient and saves time and effort.

[0054] Furthermore, methods for checking whether the openness of the fiber bundle 1 is insufficient include:

[0055] Within 30 seconds after the filter rod is produced, tear off the forming paper on the surface of the filter rod and determine whether the volume of the filament bundle 1 inside the filter rod expands to more than 3-5 times its original volume after the constraint of the forming paper is removed.

[0056] If not, it indicates that the elasticity of the filament bundle 1 is insufficient, therefore the openness of the filament bundle 1 is determined to be insufficient.

[0057] Furthermore, methods for checking whether the fiber bundle 1 is excessively loose include:

[0058] Within 30 seconds after the filter rod is produced, tear off the forming paper on the surface of the filter rod, gently pull and unfold the filament bundle 1 so that the width of the filament bundle 1 is 7-8 times its original width (that is, the diameter of the filament bundle 1 under the action of the forming paper) to determine whether there are broken filaments in the filament bundle 1.

[0059] If so, it indicates that the fiber bundle 1 is not tough enough, therefore the looseness of the fiber bundle 1 is determined to be excessive;

[0060] If not, loosen the filament bundle 1 and determine whether the amount of retraction of the filament bundle 1 along its width direction after the tension is lost is greater than or equal to 60% of the width dimension of the filament bundle 1 after it is pulled open.

[0061] If not, then the looseness of the filament bundle 1 is determined to be excessive.

[0062] Furthermore, the filter rod forming machine also includes a relaxation roller 4. Along the running direction of the filament bundle 1, the relaxation roller 4 is located downstream of the opening roller 3, and the circumferential surface of the relaxation roller 4 is in contact with the filament bundle 1. The adjustment method provided by the embodiment of the present invention further includes: while increasing the roller speed ratio between the opening roller 3 and the input roller 2, decreasing the roller speed ratio between the relaxation roller 4 and the opening roller 3. When the opening degree of the filament bundle 1 is insufficient, by increasing the roller speed ratio between the opening roller 3 and the input roller 2, the filament bundle 1 located upstream of the opening roller 3 can be narrowed, which is beneficial for opening. At the same time, decreasing the roller speed ratio between the relaxation roller 4 and the opening roller 3 can widen the filament bundle 1 located downstream of the opening roller 3, so that the filament bundle 1 has the ability to recover its curl. By adopting the above technical solution, the width of the filament bundle 1 can be narrowed before passing through the opening roller 3, and then widened again after passing through the opening roller 3, thereby avoiding insufficient opening degree of the filament bundle 1 and ensuring the ability to recover its curl; in addition, it can also ensure that the amount of plasticizers such as glycerin remains unchanged.

[0063] If the opening degree of the filament bundle 1 is insufficient, and the opening degree of the filament bundle 1 is excessive during the subsequent process of increasing the speed ratio between the opening roller 3 and the input roller 2, then the pressure applied to the filament bundle 1 by the opening roller 3 is slightly reduced based on the reference pressure value of the opening roller, and the speed ratio between the opening roller 3 and the input roller 2 is slightly increased; wherein, the reference pressure value of the opening roller is the reference value of the pressure applied to the filament bundle 1 by the opening roller 3.

[0064] Specifically, when slightly reducing the pressure applied to the yarn bundle 1 by the opening roller 3, the pressure is reduced multiple times, each time by 0.02 MPa; when slightly increasing the speed ratio between the opening roller 3 and the input roller 2, the speed ratio between the opening roller 3 and the input roller 2 is increased multiple times, each time by less than or equal to 0.01, and the sum of the slightly increased or slightly decreased speed ratio between the opening roller 3 and the input roller 2 does not exceed 0.06.

[0065] Furthermore, while reducing the speed ratio between the opening roller 3 and the input roller 2, the speed ratio between the releasing roller 4 and the opening roller 3 is increased.

[0066] When the opening looseness of the filament bundle 1 is excessive, reducing the speed ratio between the opening roller 3 and the input roller 2 can widen the filament bundle 1 located upstream of the opening roller 3, thus preventing excessive opening looseness. Simultaneously, increasing the speed ratio between the loosening roller 4 and the opening roller 3 can narrow the filament bundle 1 located downstream of the opening roller 3. By employing this technical solution, the width of the filament bundle 1 can be widened before passing through the opening roller 3 and then narrowed again after passing through it. This avoids excessive opening looseness of the filament bundle 1 while ensuring that its final width remains essentially unchanged, thus maintaining a consistent amount of plasticizers such as glycerin.

[0067] If the opening looseness of the yarn bundle 1 is excessive, and subsequent reduction of the speed ratio between the opening roller 3 and the input roller 2 results in insufficient opening looseness of the yarn bundle 1, then, based on the reference pressure value of the opening roller, the pressure applied to the yarn bundle 1 by the opening roller 3 is slightly increased, and the speed ratio between the opening roller 3 and the input roller 2 is slightly decreased. The reference pressure value of the opening roller is the baseline value of the pressure applied to the yarn bundle 1 by the opening roller 3. Specifically, the reference pressure value of the opening roller can be 0.18-0.25 MPa.

[0068] Specifically, when slightly increasing the pressure applied to the yarn bundle 1 by the opening roller 3, the pressure is increased multiple times, with each increase being 0.02 MPa; when slightly decreasing the speed ratio between the opening roller 3 and the input roller 2, the speed ratio between the opening roller 3 and the input roller 2 is decreased multiple times, with each decrease being less than or equal to 0.01, and the sum of the slight increases or decreases in the speed ratio between the opening roller 3 and the input roller 2 does not exceed 0.06.

[0069] Furthermore, the filter rod forming machine also includes: a primary air opener 5, a secondary air opener 6, and a tertiary air opener 7. The primary air opener 5 and the secondary air opener 6 are located upstream of the input roller 2 along the running direction of the filament bundle 1, while the tertiary air opener 7 is located between the opening roller 3 and the relaxing roller 4. When the filament bundle is replaced, the width of the filament bundle output from the two bundles after passing through the tertiary air opener 7 is compared. If the width of the filament bundle output from the later bundle is less than that from the earlier bundle, the speed ratio of the relaxing roller 4 to the opening roller 3 is reduced by 0.01-0.06. If the width of the filament bundle output from the later bundle is greater than that from the earlier bundle, the speed ratio of the relaxing roller 4 to the opening roller 3 is increased by 0.01-0.06. By adopting the above technical solution, the suction resistance of the filter rod can be adjusted according to the different raw materials of the fiber bundle when changing the fiber bundle package, thereby avoiding poor suction resistance stability of the filter rod caused by different raw materials of the fiber bundle.

[0070] Furthermore, the filter rod forming machine also includes a brake roller 8, which is located upstream of the input roller 2 along the running direction of the filament bundle 1. The circumferential surface of the brake roller 8 is in contact with the filament bundle 1. The adjustment method provided in the embodiment of the present invention further includes: taking five groups of filter rods produced by the filter rod forming machine, each group containing 30 filter rods, detecting the suction resistance value of each filter rod, and taking the average suction resistance value of the 30 filter rods in the same group as the average suction resistance value of the group. Then, subtracting the average suction resistance value of the group from the maximum suction resistance value in the group is used as the first count value of the group, and subtracting the minimum suction resistance value of the group from the average suction resistance value of the group is used as the second count value of the group. If, in at least three groups, the difference between the first count value and the second count value is greater than 40 Pa, the pressure applied by the brake roller 8 to the yarn bundle 1 is increased by 0.01-0.03 bar based on the reference pressure value of the brake roller 8; if, in at least three groups, the difference between the second count value and the first count value is greater than 40 Pa, the pressure applied by the brake roller 8 to the yarn bundle 1 is decreased by 0.01-0.03 bar based on the reference pressure value of the brake roller 8; wherein, the reference pressure value of the brake roller 8 is a reference value of the pressure applied by the brake roller 8 to the yarn bundle 1, and the reference pressure value of the brake roller 8 can be 0.4-0.6 bar.

[0071] When the pressure applied to the filament bundle 1 by the brake roller 8 increases, the average suction resistance decreases. In this case, the weight of the filter rod should be increased accordingly to ensure that the average suction resistance of the filter rod remains constant. Conversely, when the pressure applied to the filament bundle 1 by the brake roller 8 decreases, the average suction resistance increases. In this case, the weight of the filter rod should be decreased accordingly to ensure that the average suction resistance of the filter rod remains constant. Specifically, the weight of the filter rod can be adjusted by regulating the overall speed of the filter rod forming machine. Increasing the overall speed increases the weight of the filter rod, and decreasing the overall speed decreases the weight of the filter rod.

[0072] Furthermore, it also includes: if the difference between the first count value and the second count value does not exceed ±40Pa, and both the first count value and the second count value are less than 110Pa, then the speed ratio between the opening roller 3 and the input roller 2 is determined to be the optimal value, and there is no need to manually adjust the speed ratio between the opening roller 3 and the input roller 2.

[0073] Furthermore, the filter rod forming machine also includes a high-pressure nozzle 9. Located downstream of the loosening roller 4 along the running direction of the filament bundle 1, the high-pressure nozzle 9 increases the air pressure of the high-pressure nozzle 9 based on the reference air pressure percentage until the filament bundle 1 straightens. Then, the air pressure of the high-pressure nozzle 9 is reduced until the filament bundle 1 begins to vibrate. Finally, the air pressure of the high-pressure nozzle 9 is increased by 1%-4% until the filament bundle 1 just stops vibrating. Specifically, the reference air pressure percentage of the high-pressure nozzle can be 45%-70%. This technical solution prevents the filament bundle 1 from violently contacting the baffles on the filter rod forming machine, thus avoiding additional resistance to the loosened filament bundle 1 before it enters the high-pressure nozzle 9.

[0074] Furthermore, before adjusting the speed ratio between the opening roller 3 and the input roller 2, the following steps are also included: adjusting the air pressure of the primary air opener 5 to 130 mbar, adjusting the air pressure of the secondary air opener 6 to 110 mbar, adjusting the air pressure of the tertiary air opener 7 to 50 mbar, and adjusting the pressure applied by the input roller 2 to the yarn bundle 1 to 0.18-0.25 MPa.

[0075] Furthermore, before adjusting the speed ratio between the opening roller 3 and the input roller 2, the process also includes: removing the glue residue inside and outside the high-pressure nozzle 9, removing the fly waste inside the filter rod forming machine, and cleaning the gap between the opening plates of the primary air opener 5, the secondary air opener 6, and the tertiary air opener 7.

[0076] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A method for adjusting the suction resistance stability of filter rods, used to adjust the suction resistance stability of filter rods produced by a filter rod forming machine, wherein a brake roller, an input roller, and an opening roller are sequentially arranged on the filter rod forming machine along the running direction of the filament bundle, and the circumferential surfaces of the brake roller, the input roller, and the opening roller are all in contact with the filament bundle, characterized in that, The adjustment method includes: Inspect the openness of the filament bundles in the filter rods produced by the filter rod forming machine; If the opening degree of the filament bundle is insufficient, the speed ratio between the opening roller and the input roller is increased based on the first reference roller speed ratio. If the opening looseness of the filament bundle is excessive, then the speed ratio of the opening roller to the input roller is reduced based on the first reference roller speed ratio; Wherein, the first reference roll speed ratio is the reference value of the roll speed ratio between the opening roll and the input roll; The adjustment method further includes: taking five groups of filter rods produced by the filter rod forming machine, each group containing 30 filter rods, detecting the suction resistance value of each filter rod, and taking the average suction resistance value of the 30 filter rods in the same group as the average suction resistance value of the group. Then, subtracting the average suction resistance value of the group from the maximum suction resistance value in the group to obtain the first count value of the group, and subtracting the minimum suction resistance value of the group from the average suction resistance value of the group to obtain the second count value of the group. If the difference between the first count value and the second count value is greater than 40 Pa in at least three groups, the pressure applied to the filament by the brake roller is increased by 0.01-0.03 bar based on the brake roller reference pressure value; if the difference between the second count value and the first count value is greater than 40 Pa in at least three groups, the pressure applied to the filament by the brake roller is decreased by 0.01-0.03 bar based on the brake roller reference pressure value; wherein, the brake roller reference pressure value is the reference value of the pressure applied to the filament by the brake roller.

2. The method for adjusting the suction resistance stability of the filter rod as described in claim 1, characterized in that, The first reference roller speed ratio is 1.25-1.

5.

3. The method for adjusting the suction resistance stability of the filter rod as described in claim 1, characterized in that, The inspection of the openness of the filament bundles in the filter rods produced by the filter rod forming machine includes: Within 30 seconds after the filter rod is produced, the forming paper on the surface of the filter rod is torn off, and it is determined whether the volume of the filament bundle inside the filter rod expands to more than or equal to 3-5 times its original volume after the constraint of the forming paper is removed. If not, the looseness of the filament bundle is determined to be insufficient.

4. The method for adjusting the suction resistance stability of the filter rod as described in claim 3, characterized in that, The inspection of the openness of the filament bundles in the filter rods produced by the filter rod forming machine also includes: Within 30 seconds after the filter rod is produced, tear off the forming paper on the surface of the filter rod, gently pull the filament bundle to make the width of the filament bundle 7-8 times its original width, and determine whether there are any broken filaments in the filament bundle. If so, the looseness of the filament bundle is determined to be excessive; If not, then release the filament bundle and determine whether the amount of retraction of the filament bundle along its width direction after the tension is lost is greater than or equal to 60% of the width dimension of the filament bundle after it is pulled open; If not, then the looseness of the filament bundle is determined to be excessive.

5. The method for adjusting the suction resistance stability of the filter rod as described in claim 1, characterized in that, The filter rod forming machine also includes a relaxation roller, which is located downstream of the opening roller along the running direction of the filament bundle, and the circumferential surface of the relaxation roller is in contact with the filament bundle. The adjustment method further includes: increasing the speed ratio between the opening roller and the input roller while decreasing the speed ratio between the relaxation roller and the opening roller.

6. The method for adjusting the suction resistance stability of the filter rod as described in claim 5, characterized in that, If the opening degree of the filament bundle is insufficient, and the opening degree of the filament bundle is excessive during the process of increasing the speed ratio between the opening roller and the input roller, then the pressure applied to the filament bundle by the opening roller is slightly reduced based on the reference pressure value of the opening roller, and the speed ratio between the opening roller and the input roller is slightly increased; wherein, the reference pressure value of the opening roller is the reference value of the pressure applied to the filament bundle by the opening roller.

7. The method for adjusting the suction resistance stability of the filter rod as described in claim 6, characterized in that, When slightly reducing the pressure applied to the filament by the opening roller, the pressure is reduced multiple times, each time by 0.02 MPa; when slightly increasing the speed ratio between the opening roller and the input roller, the speed ratio between the opening roller and the input roller is increased multiple times, each time by less than or equal to 0.

01.

8. The method for adjusting the suction resistance stability of the filter rod as described in claim 5, characterized in that, While decreasing the speed ratio between the opening roller and the input roller, the speed ratio between the releasing roller and the opening roller is increased.

9. The method for adjusting the suction resistance stability of the filter rod as described in claim 8, characterized in that, If the opening looseness of the filament bundle is excessive, and the opening looseness of the filament bundle is insufficient during the process of reducing the speed ratio between the opening roller and the input roller, then based on the reference pressure value of the opening roller, the pressure applied to the filament bundle by the opening roller is slightly increased, and the speed ratio between the opening roller and the input roller is slightly decreased; wherein, the reference pressure value of the opening roller is the reference value of the pressure applied to the filament bundle by the opening roller.

10. The method for adjusting the suction resistance stability of the filter rod as described in claim 9, characterized in that, When slightly increasing the pressure applied to the filament by the opening roller, the pressure is increased multiple times, with each increase being 0.02 MPa; when slightly decreasing the speed ratio between the opening roller and the input roller, the speed ratio between the opening roller and the input roller is decreased multiple times, with each decrease being less than or equal to 0.

01.

11. The method for adjusting the suction resistance stability of the filter rod as described in claim 6 or 9, characterized in that, The reference pressure value of the opening roller is 0.18-0.25 MPa.

12. The method for adjusting the suction resistance stability of the filter rod as described in claim 5, characterized in that, The filter rod forming machine further includes: a primary air opener, a secondary air opener, and a tertiary air opener. The primary and secondary air openers are located upstream of the input roller along the running direction of the filament bundle, and the tertiary air opener is located between the opening roller and the releasing roller. When the filament bundle is replaced, the width of the filament bundles output from the previous and subsequent bundles after passing through the tertiary air opener is compared. If the width of the filament bundle output from the subsequent bundle is less than the width of the filament bundle output from the previous bundle, the speed ratio between the releasing roller and the opening roller is reduced by 0.01-0.

06. If the width of the filament bundle output from the subsequent bundle is greater than the width of the filament bundle output from the previous bundle, the speed ratio between the releasing roller and the opening roller is increased by 0.01-0.

06.

13. The method for adjusting the suction resistance stability of the filter rod as described in claim 1, characterized in that, The reference pressure value of the brake roller is 0.4-0.6 bar.

14. The method for adjusting the suction resistance stability of the filter rod as described in claim 12, characterized in that, Also includes: If the difference between the first count value and the second count value does not exceed ±40 Pa, and both the first count value and the second count value are less than 110 Pa, then the speed ratio between the opening roller and the input roller is determined to be the optimal value, and no manual adjustment of the speed ratio between the opening roller and the input roller is required.

15. The method for adjusting the suction resistance stability of the filter rod as described in claim 14, characterized in that, The filter rod forming machine also includes a high-pressure nozzle. Along the running direction of the filament bundle, the high-pressure nozzle is located at the downstream end of the loosening roller. After the roller speed ratio between the loosening roller and the input roller is adjusted to the optimal value, the air pressure of the high-pressure nozzle is increased based on the reference air pressure percentage of the high-pressure nozzle until the filament bundle is straightened. Then, the air pressure of the high-pressure nozzle is reduced until the filament bundle begins to vibrate. Finally, the air pressure of the high-pressure nozzle is increased by 1%-4% so that the filament bundle just stops vibrating.

16. The method for adjusting the suction resistance stability of the filter rod as described in claim 15, characterized in that, The reference air pressure percentage for the high-pressure nozzle is 45%-70%.

17. The method for adjusting the suction resistance stability of a filter rod as described in claim 12, characterized in that, Before adjusting the speed ratio between the opening roller and the input roller, the method further includes: adjusting the air pressure of the primary air opener to 130 mbar, adjusting the air pressure of the secondary air opener to 110 mbar, adjusting the air pressure of the tertiary air opener to 50 mbar, and adjusting the pressure applied to the filament by the input roller to 0.18-0.25 MPa.

18. The method for adjusting the suction resistance stability of a filter rod as described in claim 15, characterized in that, Before adjusting the speed ratio between the opening roller and the input roller, the process also includes: removing the glue residue inside and outside the high-pressure nozzle, removing the fly shavings inside the filter rod forming machine, and cleaning the gap between the opening plates of the primary air opener, the secondary air opener, and the tertiary air opener.

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