WO2024094593A1 - Dispositif et procédé de sertissage d'une bande plate ainsi que machine de fabrication de filtres-papier - Google Patents

Dispositif et procédé de sertissage d'une bande plate ainsi que machine de fabrication de filtres-papier Download PDF

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Publication number
WO2024094593A1
WO2024094593A1 PCT/EP2023/080186 EP2023080186W WO2024094593A1 WO 2024094593 A1 WO2024094593 A1 WO 2024094593A1 EP 2023080186 W EP2023080186 W EP 2023080186W WO 2024094593 A1 WO2024094593 A1 WO 2024094593A1
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WO
WIPO (PCT)
Prior art keywords
crimping
flat web
travel speed
designed
closing movement
Prior art date
Application number
PCT/EP2023/080186
Other languages
German (de)
English (en)
Inventor
Hartmut Meis
Patrick STAHL
Patrick Westeroth
Original Assignee
Körber Technologies Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Körber Technologies Gmbh filed Critical Körber Technologies Gmbh
Publication of WO2024094593A1 publication Critical patent/WO2024094593A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/512—Changing form of handled material
    • B65H2301/5126—Embossing, crimping or similar processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5152—Cutting partially, e.g. perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/54—Cigarette making

Definitions

  • the invention relates to a device for crimping a flat web made of a material from the tobacco processing industry, comprising a crimping station with a first crimping roller mounted so as to be rotatable about a first axis of rotation and with a second crimping roller mounted so as to be rotatable about a second axis of rotation, which are operatively coupled and designed to produce a multiplicity of longitudinal lines in the flat web as it passes between the crimping rollers, along which the flat web can be easily folded, in particular in its transverse direction.
  • the invention further relates to a method for crimping a flat web made of a material from the tobacco processing industry, comprising the following steps: providing a flat web and feeding the flat web to a crimping station, producing a multiplicity of longitudinal lines in the flat web, along which the flat web can be easily folded, in particular in its transverse direction, by passing the flat web in the crimping station between a first crimping roller rotating about a first axis of rotation and a second crimping roller rotating about a second axis of rotation.
  • the invention relates to a machine for producing paper filters.
  • flat sheets are processed and used for various purposes.
  • flat sheets made from a paper material from the tobacco processing industry are processed into paper filters.
  • a process step that is often carried out when processing flat sheets is the so-called "crimping" of the flat sheet.
  • This term describes a process in which a large number of longitudinal lines are introduced into the flat sheet.
  • the longitudinal lines are often equidistant in the transverse direction of the flat sheet and extend in the longitudinal direction of the flat sheet.
  • they are often continuous longitudinal lines that extend uninterrupted along the longitudinal direction of the flat sheet.
  • the longitudinal lines introduced into the flat sheet during crimping ensure that the flat sheet can be easily gathered or folded in its transverse direction, i.e. transverse to the longitudinal lines. Gathering the flat sheet is also made easier by the fact that not only longitudinal lines are introduced into the flat sheet during crimping, but also the cross-section of the flat sheet, viewed in a plane perpendicular to its longitudinal direction, is changed in such a way that it at least approximately has a zigzag structure.
  • Crimping rollers are often made up of a large number of disks arranged on a common axis. The disks are parallel to one another and each aligned perpendicular to the common axis. In the area of the outer surfaces, the disks of the crimping rollers are separated from one another by circumferential grooves. The two crimping rollers mesh in such a way that a disk of one crimping roller extends into the groove between the disks of the other crimping roller that interacts with it. By adjusting the distance between the crimping rollers, the engagement depth of the disks can be adjusted. and grooves, which is also referred to as crimping depth.
  • a machine in the tobacco processing industry that includes a crimping device is known, for example, from DE 10 2017 007 455 A1.
  • the flat sheet is crimped by passing it between the crimping rollers. Longitudinal lines are introduced into the flat sheet and its cross-section is changed as described. Based on this structure, the flat sheet can then be gathered together and, for example, processed in a strand forming unit to form a paper filter strand.
  • Paper filters are used in traditional rod-shaped articles in the tobacco processing industry, but also in so-called tobacco heated products, which are also known as heat-not-burn articles. When tobacco heated products are consumed, the tobacco material is heated and not burned.
  • WO 2019/123210 A1 discloses a method in which a material thickness of the flat web is measured with a sensor. The distance between the crimping rollers is adjusted as a function of this distance in order to achieve the desired result in the crimping process carried out.
  • a device for crimping a flat sheet made of a material from the tobacco processing industry comprising: a crimping station with a first crimping roller mounted so as to be rotatable about a first axis of rotation and with a second crimping roller mounted so as to be rotatable about a second axis of rotation, which are operatively coupled and designed to produce a multiplicity of longitudinal lines in the flat web as it passes between the crimping rollers, along which the flat web can be easily folded, in particular in its transverse direction, wherein this device is further developed by: a detection unit which is set up and designed to detect a splice point and/or an increase in the material thickness of the flat web which is spatially limited in the longitudinal direction of the flat web and which exceeds a predeterminable limit value, and to generate an opening signal in response thereto, wherein the detection unit is arranged upstream of the crimping station in the material flow direction,
  • Adjustment means which are set up and designed to move at least one of the two crimping rollers along an adjustment path between a working position, in which longitudinal lines are generated in the flat web when the flat web passes between the crimping rollers, and a disengagement position relative to one another, wherein a distance between the first and the second axis of rotation is smaller in the working position than in the disengagement position, a control unit coupled to the detection unit and the adjustment means, which is set up and designed so that the adjustment means, in response to the opening signal, move the at least one crimping roller in an opening movement in the direction of the disengagement position, move the at least one crimping roller in a closing movement in the direction of the working position, and carry out the closing movement in two mutually different sections of the adjustment path at mutually different travel speeds.
  • the device advantageously enables flat webs to be processed continuously, even if they have splices or increases in material thickness. Splices occur when an outgoing flat web meets a flat web that is to be processed afterwards. is connected.
  • the flat webs provided on bobbins for example, are connected to form an endless flat web using a splicing device in order to enable a continuous process.
  • Increases in the material thickness of the flat web sometimes occur within the material of the flat web, i.e. during processing of the flat web provided on a bobbin, for example. Such increases in material thickness occur, for example, as a result of splicing processes that are carried out when producing the flat web.
  • the crimping rollers are moved back towards the working position to continue the production process.
  • the flat web is not crimped in the usual way. This means that articles or intermediate products from the tobacco processing industry manufactured from this area of the flat web have to be removed from the ongoing production process. They are rejected because they usually do not meet the desired quality requirements.
  • the closing movement is carried out as quickly as possible after the splice has been passed through or the material thickness of the flat web has been increased.
  • the aim is to reach the working position of the crimping rollers as quickly as possible so that the production process can be continued with the desired quality.
  • the working position must be set very precisely.
  • the working position is set with accuracies in the range of a few micrometers (pm) to approx. 10 pm.
  • a very precise positioning of the crimping rollers is carried out. In many cases, precise positioning is only possible if the crimping rollers are moving at a correspondingly low speed.
  • the closing movement is carried out at two different speeds.
  • the control unit is preferably set up and designed to move the adjustment means, with which a distance between the crimping rollers is set, in response to the opening signal in a rapid opening movement, i.e. at a high travel speed, in the direction of the disengagement position.
  • the opposite closing movement takes place after a predetermined or predeterminable period of time has elapsed, i.e. at a slightly later point in time.
  • the time period that passes between the opening movement and the closing movement is used for the splice point to pass through or for the material thickness to be increased by the pair of crimping rollers.
  • the value of this time period can be determined, for example, using empirical tests.
  • the control unit is also preferably set up and designed to control the adjustment means in such a way that after the aforementioned period of time has elapsed, the crimping rollers are again moved at a high travel speed in the direction of the working position.
  • the crimping rollers are not moved at high speed over the entire travel path, but only in a predominant section, for example. The The remaining section of the travel path is traversed at a much lower speed in order to enable the working position to be approached with high accuracy.
  • the travel path of the crimping rollers which results in particular from the difference in the axis distance between the first rotation axis and the second rotation axis when the crimping rollers are in the working position on the one hand and in the disengagement position on the other, can be adjusted depending on the material thickness of the flat strip being processed.
  • the material thickness of the flat strips being processed is, for example, between 35 pm and 500 pm.
  • a crimping depth is first set, i.e. a depth at which the crimping rollers engage with each other. This crimping depth determines the working position. If a splice point or an area of greater material thickness is now detected in the flat web, the material thickness in this area is easily twice as large as in the areas in front of and behind it. Accordingly, the crimping depth is increased during the release process, i.e. during the opening movement in the direction of the release position, for example by the value of the increase in material thickness in the area of the splice. As already explained, this increase in material thickness is approximately the material thickness of the processed flat web (assuming that the material thickness of the flat web doubles in the area of the splice).
  • the travel path determining a release width i.e. the distance between the working position and the opening position, can also be in the range between 35 pm and 500 pm, for example. According to further embodiments, it is provided that the travel path is between 50 pm and 300 pm, and in particular between 100 pm and 200 pm.
  • the device is further developed in that the closing movement starting from the release position tion up to the working position, wherein the control unit is set up and designed to control the adjustment means in such a way that the closing movement in a first partial section, which is first traversed starting from the disengagement position and takes up a predominant portion of the adjustment path traversed during the closing movement, is traversed at a second, in particular temporally constant, travel speed and the closing movement in a second partial section, which is traversed subsequent to the first partial section, is traversed at a third, in particular temporally constant, travel speed, wherein the third travel speed is lower than the second travel speed.
  • the advantage of carrying out the closing movement, which takes place at a higher speed in the first section than in the second section, is that the area of the flat track in which an insufficient crimping process takes place due to the disengaged crimping rollers is minimized.
  • the crimping rollers are moved from the opening position at a high speed towards the working position. In order to still be able to control the working position precisely, the further closing movement in the second section of the adjustment path takes place at a lower speed.
  • the opening movement takes place starting from the working position up to the disengagement position and the control unit is set up and designed to control the adjustment means in such a way that the opening movement is carried out in a partial section which takes up at least the majority of an adjustment path traversed during the opening movement, at a first, in particular temporally constant, travel speed, wherein the (previously mentioned) third travel speed is lower than the first travel speed and the third travel speed is lower than the second travel speed. It is further provided in particular that the first travel speed is greater than or equal to the second travel speed.
  • the crimping rollers are initially moved quickly towards the opening position, namely at the first travel speed. After passing through the splice point or increasing the material thickness of the flat web, the crimping rollers are again moved towards the working position at a comparatively high travel speed, the second travel speed, which is however less than or equal to the opening speed. In order to be able to control the working position precisely, the crimping rollers are then moved at a lower speed, the third travel speed. This procedure has proven to be advantageous. The resulting waste can be minimized, and at the same time damage to the crimping device, for example from a splice point, can be prevented. The desired working position is reached with great precision.
  • the first section takes up at least 80%, in particular at least 85%, and in particular at least 90% of the adjustment path traversed during the closing movement.
  • the specified values that the first section takes up on the adjustment path traversed during the closing movement have proven to be advantageous in practical tests.
  • the device is further developed in that the control unit is designed and configured to change an adjustment point at which the transition between the first and the second subsection takes place, wherein the control unit is in particular designed and configured to change the adjustment point depending on a parameter received as part of a user input.
  • the user input can, similar to the fixed values mentioned above, be given as a percentage.
  • the user input can be selected in such a way that the quality requirements for the crimping process desired by the user, for example a crimping depth desired by the user, are already achieved when moving from the first to the second section. In other words, products that are manufactured from the flat web during the process of the crimping rollers in the second section already meet the quality requirements specified by the user. This measure can further reduce the amount of waste that occurs.
  • the device is further developed in that the adjustment means comprise a linear guide and at least one displacement motor, wherein the displacement motor is set up and designed to move the at least one crimping roller, guided by the linear guide, along the adjustment path, wherein the adjustment means further comprise a rotary encoder coupled to the displacement motor and a linear encoder coupled to the linear guide, with each of which an adjustment of the at least one crimping roller along the adjustment path can be measured, wherein the control unit is further set up and designed to feedback-control the opening movement taking into account the measured values recorded by the rotary encoder and to feedback-control the closing movement taking into account the measured values recorded by the rotary encoder and the linear encoder.
  • a linear encoder allows a more precise measurement of the position of the crimping rollers than a rotary encoder.
  • the positioning of the crimping rollers relative to each other can therefore be carried out more precisely on the basis of the measured values of the linear encoder than is possible on the basis of the measured values obtained from a rotary encoder coupled to the travel motor.
  • This is mainly due to the fact that the mechanical error chain, which in the case of a rotary encoder particularly includes an adjustment gear, can be shortened. For this reason, Controlling the distance between the crimping rollers in the second section using the measured values recorded by a linear encoder has proven to be advantageous.
  • control unit is set up and designed to control the closing movement in the first subsection taking into account the measured values recorded by the rotary encoder and in the second subsection taking into account the measured values recorded by the linear encoder.
  • the device for crimping the flat web is further developed in that the detection unit comprises at least one sensor which is designed and configured to measure the material thickness of the flat web, wherein the sensor is in particular an optical sensor, furthermore in particular the sensor is designed and configured to measure a translucency of the flat web.
  • An opening signal can be generated by the sensor in particular when the measured value of the material thickness of the flat web is outside a reference range or tolerance range or exceeds a specified limit value.
  • the optical sensor is, for example, a laser sensor.
  • the sensor can also be designed as a mechanical button, microwave sensor, high-frequency sensor and/or ultrasonic sensor.
  • At least one of the two crimping rollers is mounted so that it can move relative to the other crimping roller. This allows the mutual distance between the crimping rollers to be varied.
  • the adjustment means therefore only act on one of the two crimping rollers, with the other crimping roller that interacts with it being fixedly mounted.
  • both crimping rollers are movable and are thus moved relative to one another.
  • the first and second crimping rollers are arranged in the crimping station in such a way that the first axis of rotation, about which the first crimping roller is rotatably mounted, and the second axis of rotation, about which the second crimping roller is rotatably mounted, are aligned at least approximately parallel to one another.
  • the crimping rollers are furthermore designed in such a way that the longitudinal lines introduced into the flat web are linear embossings.
  • the lines are in particular continuous, i.e. uninterrupted. This consideration naturally excludes the areas in which the splice point or the increase in the material thickness of the flat web is present.
  • intermittent lines can also be provided, as long as the lines result in sufficient embossing or weakening of the flat web so that it is or can be gathered in the transverse direction or is easily foldable.
  • the object is further achieved by a method for crimping a flat sheet made of a material from the tobacco processing industry, comprising the following steps:
  • the method is further developed in that the closing movement takes place between the disengagement position and the working position, wherein the closing movement is carried out at a second, in particular temporally constant, travel speed in a first partial section, which is first traveled through starting from the disengagement position and takes up a predominant portion of the adjustment path traveled during the closing movement, and the closing movement is carried out at a third, in particular temporally constant, travel speed in a second partial section, which is traveled through subsequent to the first partial section, wherein the third travel speed is lower than the second travel speed.
  • the opening movement between the working position and the Disengagement position takes place, wherein the opening movement is carried out in a partial section which takes up at least the predominant part of an adjustment path traversed during the opening movement, at a first, in particular temporally constant, travel speed, wherein the third travel speed is lower than the first travel speed and the third travel speed is lower than the second travel speed.
  • the first travel speed is greater than or equal to the second travel speed. Furthermore, it is provided in particular that the first or the second travel speed is the highest of all travel speeds, the second travel speed is less than or equal to the first travel speed and the third travel speed is the lowest travel speed.
  • the method is further developed in that the second partial section takes up at least 80%, in particular at least 85%, further in particular at least 90% of the adjustment path traversed during the closing movement.
  • an adjustment point is changed at which the transition between the first and the second subsection takes place, wherein the adjustment point is changed in particular depending on a parameter received as part of a user input.
  • the adjustment means comprise a linear guide and at least one displacement motor, wherein the displacement motor moves the at least one crimping roller, guided by the linear guide, along the adjustment path, wherein the adjustment means further comprise a rotary encoder coupled to the displacement motor and a linear encoder coupled to the linear guide, with each of which an adjustment of the at least one Crimping roller is measured along the adjustment path, whereby the opening movement is controlled in a feedback manner taking into account the measured values recorded by the rotary encoder and the closing movement is controlled in a feedback manner taking into account the measured values recorded by the rotary encoder and the linear encoder.
  • the measured values recorded by the rotary encoder and the measured values recorded by the linear encoder are used as follows, namely in such a way that the closing movement is controlled in a feedback manner in the first subsection taking into account the measured values recorded by the rotary encoder and in the second subsection taking into account the measured values recorded by the linear encoder.
  • the method is further developed in that the detection unit comprises at least one sensor, wherein the material thickness of the flat web is measured with the sensor, and wherein the sensor is in particular an optical sensor, which further measures in particular a translucency of the flat web.
  • the opening signal is generated when the measured value of the material thickness is outside a reference range or tolerance range.
  • the measurement can be carried out optically, for example using a laser.
  • the translucency of the material of the flat sheet is measured, and this value can be used to determine the material thickness of the flat sheet.
  • Other ways of determining the material thickness are a measurement with a mechanical probe, a microwave measurement, a high-frequency measurement or even an ultrasound measurement.
  • a machine for producing paper filters comprising a supply unit for providing a flat web of a paper material of the tobacco processing industry. industry and a device for crimping the flat web according to one or more of the aforementioned embodiments.
  • the machine also comprises a feed unit which is designed and set up to feed the flat web to the device for crimping, a gathering unit which is designed and set up to gather the crimped flat web transversely to its longitudinal direction, a format unit which is designed and set up to produce a paper filter strand from the gathered, crimped flat web and a cutting unit which is designed and set up to cut paper filters from the paper filter strand.
  • the machine according to aspects of the invention makes it possible to produce paper filters of the highest quality with minimal waste at the same time.
  • the machine allows a continuous production process that does not have to be interrupted at splice points on the flat web.
  • it is necessary to briefly interrupt the production process at a splice point on the flat web or to continue it at a reduced speed and to pass through the splice point manually.
  • the products manufactured from this area of the flat web must be discharged.
  • Such a labor-intensive and lengthy interruption of the production process is advantageously not necessary with the machine according to the aforementioned aspects of the invention.
  • the machine is further developed by a discharge unit which is designed and configured to discharge paper filters produced from the paper filter strand from the ongoing process, wherein the control unit of the crimping device is further configured to trigger a discharge process of the discharge unit in response to the opening signal of the detection unit.
  • control unit is further designed and configured to To synchronize the opening movement with the opening signal in such a way that the splice point and/or the increase in the material thickness of the flat web passes through the crimping rollers before the opening movement is completed.
  • the synchronization of the opening movement to the opening signal allows the time period between the opening movement and the closing movement to be minimized.
  • This length of time is chosen as a safety margin, so that it can be assumed with almost absolute certainty that at the start of the closing movement the splice point or the increase in the material thickness of the flat web has already passed the pair of crimping rollers. This means that damage to the pair of crimping rollers due to this thickening of the flat web can be ruled out. At the same time, the area that cannot be processed into products of the desired quality can be minimized.
  • Embodiments of the invention may fulfill individual features or a combination of several features.
  • Fig. 1 is a schematically simplified representation of a machine for producing paper filters, comprising a device for crimping a flat web,
  • Fig. 2 is a schematic representation of a curve of the crimping depth of the crimping rollers as a function of time, during an opening movement and a closing movement, and
  • FIG. 3 and 4 simplified perspective views of a crimping station for crimping a flat strip.
  • Fig. 1 shows a simplified schematic representation of a machine 2 for producing paper filters 24.
  • the machine 2 comprises a supply unit 4 for supplying a flat web 6, which consists for example of a paper material from the tobacco processing industry.
  • the flat web 6 is provided on a bobbin 8.
  • the supply unit 4 comprises a bobbin changer or is designed as such.
  • the machine 2 comprises a splicing unit 10.
  • the flat web 6 is fed from the splicing unit 10, possibly using an intermediate storage device not shown in Fig. 1, into trans-
  • the flat web 6 is fed in the transport direction T to a device 12 for crimping the flat web 6, which will also be referred to below as the crimping device 12.
  • the flat web is transported in its longitudinal direction L, which corresponds to the transport direction T.
  • a feed unit 14 is provided, which is designed and set up to feed the flat web 6 to the crimping device 12.
  • the feed unit 14 is illustrated schematically in Fig. 1 by a pair of transport rollers. Downstream of the crimping device 12, the crimped flat web enters a gathering unit 16.
  • the gathering unit 16 is designed and set up to gather the crimped flat web transversely to its longitudinal direction.
  • the gathering unit 16 is a flat guide which tapers conically in the transport direction T and in this way gathers the flat web.
  • a format unit 18 in which a paper filter strand 20 is produced from the crimped flat web. With the help of a cutting unit 22, individual paper filters 24 are cut from the paper filter strand 20.
  • the machine 2 also includes a discharge unit 52 with which individual paper filters can be discharged from the production process.
  • the crimping device 12 comprises a crimping station 26, a detection unit 28 and a control unit 30.
  • the control unit 30 is coupled to the crimping station 26 and the detection unit 28 in terms of data technology, for example via data lines shown in the figure and not designated in more detail.
  • the crimping station 26 comprises a first crimping roller 32a, which is mounted so as to be rotatable about a first rotation axis 34a.
  • the crimping station 26 also comprises a second crimping roller 32b, which is mounted so as to be rotatable about a second rotation axis 34b.
  • the first and second crimping rollers 32a, 32b are operatively coupled.
  • the rotation speeds of the two crimping rollers 32a, 32b are coordinated with one another.
  • drives (not shown in the figure), for example drive motors, of the crimping rollers 32a, 32b are controlled accordingly. This control can be carried out, for example, via the control unit 30.
  • the two crimping rollers 32a, 32b are also designed to introduce a plurality of longitudinal lines into the flat web 6 as it passes between the crimping rollers 32a, 32b. These longitudinal lines are, for example, embossings.
  • the flat web 6 can be easily folded along these longitudinal lines, in particular in its transverse direction, which is oriented transversely to the longitudinal direction L of the flat web 6, so that it can be gathered together in the gathering unit 16 arranged downstream.
  • the crimping rollers 32a, 32b are designed in a manner known per se.
  • They comprise, for example, a large number of disks arranged parallel to one another, which are spaced apart from one another by circumferential grooves in the area of a circumferential surface of the respective crimping roller 32a, 32b.
  • the disks of one crimping roller 32a, 32b engage in the grooves of the other crimping roller 32a, 32b, so that the lines mentioned are embossed on the flat sheet 6 as it passes between the crimping rollers 32a, 32b.
  • the flat sheet 6 is embossed or pre-folded in a zigzag shape in cross-section, viewed in a plane perpendicular to its longitudinal direction L.
  • the detection unit 28 is arranged upstream of the crimping station 26 in the material flow direction T, i.e. arranged upstream in the material flow direction T.
  • the detection unit 28 is set up and designed to detect a splice point and/or an increase in the material thickness of the flat web 6 that is spatially limited in the longitudinal direction L of the flat web 6.
  • a splice point as an example. Such a splice point is created when the outgoing flat web 6 is connected to the further flat web 6' using the splice unit 10.
  • the corresponding statements also apply to an increase in the material thickness of the flat web 6 that is spatially limited in the longitudinal direction L of the flat web 6, which can be caused, for example, by a the splice performed on the flat track 6.
  • the detection unit 6 is set up and designed to measure the material thickness of the flat web 6 and to determine whether a predetermined or predeterminable limit value is exceeded.
  • the detection unit 28 generates an opening signal S.
  • This opening signal S is communicated from the detection unit 28 to the control unit 30.
  • the control unit 30 controls adjustment means 36 of the crimping station 26.
  • the adjustment means 36 for example a suitably designed and configured adjustment motor, are set up and designed to move at least one of the two crimping rollers 32a, 32b along an adjustment path 38.
  • the first crimping roller 32a is designed to be adjustable by way of example.
  • the adjustment path 38 illustrates this adjustability of the first crimping roller 32a.
  • the first rotation axis 34a of the first crimping roller 32a is displaced linearly so that the distance between the first and second rotation axes 34a, 34b changes.
  • the adjustment path 38 is shown in an oversized manner.
  • the adjustment means 36 are designed to move the first crimping roller 32a between a working position and a disengagement position.
  • the working position longitudinal lines are embossed between the crimping rollers 32a, 32b of the flat web 6 as the flat web 6 passes through.
  • the disengagement position the distance between the two rotation axes 34a, 34b of the crimping rollers 32a, 32b is greater than in the working position.
  • the crimping rollers 32a, 32b are also moved far enough apart that a splice present in the flat web 6 can pass the crimping rollers 32a, 32b without a mechanical event, for example a mechanical impact, occurring in the crimping station 26.
  • the control unit 30 is arranged and designed to control the setting means 36 of the crimping station 26 such that the first crimping roller 32a in In response to the opening signal S, the first crimping roller 32a is moved in an opening movement in the direction of the disengagement position. After a predetermined or predeterminable period of time, the first crimping roller 32a is moved in a closing movement in the direction of the working position. The closing movement takes place in two different sections of the adjustment path 38 with different travel speeds.
  • the detection unit 28 used to detect the material thickness of the flat web 6 is, for example, a sensor that is set up to measure a translucency of the flat web 6.
  • an optical sensor is used.
  • it is a laser sensor.
  • the machine shown in Fig. 1 for producing paper filters 24 comprises the discharge unit 52, illustrated by an arrow.
  • the discharge unit 52 is designed and configured to discharge paper filters 24 produced from the paper filter strand 20 from the ongoing process.
  • the control unit 30 of the crimping device 12 is configured to trigger a discharge process of the discharge unit 52 in response to the opening signal S of the detection unit 28. The exact time of the discharge process takes place taking into account the production speed.
  • the opening movement and the closing movement of the first crimping roller 32a will be explained in connection with Fig. 2.
  • the figure shows a schematic representation of the crimping depth A over time.
  • the crimping depth correlates directly with a distance between the crimping rollers 32a, 32b, for example the distance between the rotation axes 34a, 34b, but with the opposite sign. This means that as the distance between the rotation axes 34a, 34b decreases, the crimping depth increases and vice versa.
  • a zero point of the crimping depth can be set to the value at which cylinder shells constructed from the envelope curves of the crimping rollers just touch. As the crimping rollers mesh more and more, the crimping depth assumes positive values.
  • Fig. 2 shows the crimping depth A in arbitrary units over time t, also shown in arbitrary units. Instead of focusing on time t, it would also be possible to focus on a position along the flat track 6, viewed in the
  • the crimping rollers 32a, 32b are in the working position. In the working position, the crimping rollers 32a, 32b mesh with a crimping depth A1. In the working position, the crimping depth is controlled, for example, with feedback.
  • the control unit 30 receives the opening signal S. Based on the processing speed and the geometry of the material flow in the machine 2, the time t2 is determined at which the control unit 30 controls the setting means 36 such that the first crimping roller 32a begins the opening movement in the direction of the disengagement position.
  • the first crimping roller 32a is moved at high speed, referred to as the first travel speed, in the direction of the disengagement position. This shows the large gradient with which the crimping depth A decreases from time t2.
  • the crimping depth A is so low that articles or intermediate products manufactured from a flat web 6 crimped to this depth, for example paper filters 24 manufactured from the flat web 6, no longer meet the desired quality criteria.
  • This limit value of the crimping depth shall be referred to as crimping depth A3.
  • the products manufactured from the associated area of the flat web 6 are ejected.
  • the ejection unit 52 is controlled to eject paper filters 24 manufactured from the associated area of the paper web 6.
  • the splice passes through the pair of crimping rollers.
  • the first crimping roller 32a has not yet fully completed the opening movement in the direction of the disengagement position.
  • the crimping rollers 32a have reached the crimping depth A2, which corresponds to the disengagement position.
  • the time period until at time t6, at which the closing movement begins and the first crimping roller 32a is moved back towards the working position, is dimensioned with an appropriate safety margin. This ensures with almost absolute certainty that the splice has passed the pair of crimping rollers before the closing movement begins.
  • the closing movement takes place in a first section, which is first traveled through starting from the disengagement position and takes up a predominant portion of the adjustment path 38 traveled through during the closing movement, at a second travel speed.
  • the first section extends between the time t6 and the time t7.
  • the second travel speed can be similar to or the same as the first travel speed with which the first crimping roller 32a is moved in the direction of the disengagement position between the time t2 and the time t5.
  • the travel speeds are in particular constant over time, at least in sections.
  • the crimping depth A again reaches the value A2.
  • This value is characterized by the fact that articles that are manufactured from a flat strip crimped with the corresponding crimping depth meet the specified quality criteria. In other words, from time t7, the crimping depth A is again large enough to produce articles of the desired quality. From time t7, the removal of the articles from the production process can therefore be stopped.
  • the value A2 of this crimping depth can be set in particular by the user of machine 2, for example, taking into account the respective quality criteria.
  • the first crimping roller 32a continues the closing movement at a third travel speed.
  • This third travel speed is significantly lower than the first and second travel speeds.
  • first travel speed: section t2 t5; second travel speed: section t6 t7; third travel speed: section t8 t9 the increase in the crimping depth A and thus the travel speed is significantly higher than in sections t8 to t9.
  • the increase in the crimping depth in sections t6 to t7 is also significantly greater than in sections t8 to t9, since in the first section of the closing movement the first crimping roller 32a is moved at a higher travel speed than in the second section of the closing movement. From time t9, the first crimping roller 32a has reached its working position again.
  • the entire opening movement extends between times t2 and t5, the entire closing movement extends between times t6 and t9.
  • the first section of the closing movement which takes place between times t6 and t7, extends between the crimping depth A2 and A3.
  • the second section extends between the crimping depth A3 and A1.
  • the adjustment path 38 extends from the crimping depth A2 to the crimping depth A1.
  • the first section takes up the majority of the adjustment path 38 traversed during the closing movement.
  • the first section takes up at least 80%, in particular at least 85% and furthermore in particular at least 90% of the entire adjustment path 38 that extends between A2 and A1.
  • the transition between the first section and the second section is defined by an adjustment point at which the crimp depth is A3.
  • This adjustment point can be changed depending on a user input.
  • the adjustment point, defined by the value of the crimp depth A3, can be set, for example, depending on the quality criteria for the products manufactured from the crimped flat strip.
  • 3 and 4 each show an embodiment of the crimping station 26 in a simplified perspective view.
  • the adjustment means 36 are designed in such a way that they comprise a linear guide 40. With the help of this linear guide 40, the first crimping roller 32a can be moved relative to the second crimping roller 32b.
  • the second crimping roller 32b is, for example, fixedly mounted.
  • the first crimping roller 32a is mounted on a support plate 42, which is coupled to the base plate of the crimping station 26 via the linear guide 40 for moving the first crimping roller 32a.
  • the first crimping roller 32a and its first drive motor 44a are mounted on the support plate 42.
  • the second crimping roller 32b is driven by a second drive motor 44b and is mounted on the base plate.
  • a travel motor 46 is provided for moving the first crimping roller 32a along the linear guide 40.
  • the travel motor 46 is designed and constructed to move the first crimping roller 32a, guided by the linear guide 40, along the adjustment path 38 (see also Fig. 1).
  • a rotary encoder 48 is coupled to the travel motor 46.
  • a linear encoder 50 is coupled to the linear guide 40.
  • the movement and position of the first crimping roller 32a along the adjustment path 38 can be measured using both the rotary encoder 48 and the linear encoder 50.
  • the distance between the crimping rollers 32a, 32b, in other words also the crimping depth shown in Fig. 2 can be calculated from the measured values of both encoders 48, 50.
  • the measured values of the linear encoder 50 are, however, more precise.
  • the control unit 30 is set up and designed to control the opening movement with feedback, taking into account both the measured values recorded by the rotary encoder 48 and the measured values recorded by the linear encoder 50.
  • control unit 30 is designed and constructed to control the closing movement in the first section, i.e. between the crimping depth A2 and the crimping depth A3 or between the times t6 and t7, taking into account the measured values recorded by the rotary encoder 48.
  • the movement of the first crimping roller 32a along the adjustment path 38 is controlled taking into account the measured values recorded by the linear encoder 50. This makes it possible to move to the working position precisely.

Landscapes

  • Replacement Of Web Rolls (AREA)

Abstract

L'invention concerne un dispositif (12) et un procédé de sertissage d'une bande plate (6) constituée d'une matière de l'industrie de traitement du tabac, ainsi qu'une machine (2) de fabrication de filtres-papier (24). Un poste de sertissage (26) comportant un premier rouleau de sertissage (32a) et un second rouleau de sertissage (34b) est conçu de manière à générer dans la bande plate (6) une pluralité de lignes longitudinales, le long desquelles la bande plate (6) peut aisément être pliée. Une unité de détection (28) est conçue et réalisée de manière à détecter un point de raccordement et/ou une augmentation limitée dans l'espace dans la direction longitudinale (l) de la bande plate (6) d'une épaisseur de matériau de la bande plate (6) et à générer un signal d'ouverture S. Des moyens de réglage (36) déplacent au moins l'un des deux rouleaux de sertissage (32a,32b) le long d'une trajectoire de déplacement (38) entre une position de travail et une position de désembrayage. Une unité de commande (30) commande les moyens de réglage (36) en réponse au signal d'ouverture S, de telle sorte que ledit au moins un rouleau de sertissage (32a, 32b) se déplace, en un mouvement d'ouverture en direction de la position de désembrayage, et en un mouvement de fermeture en direction de la position de travail dans deux parties différentes l'une de l'autre de la trajectoire de déplacement (38), à des vitesses de déplacement différentes l'une de l'autre.
PCT/EP2023/080186 2022-11-01 2023-10-30 Dispositif et procédé de sertissage d'une bande plate ainsi que machine de fabrication de filtres-papier WO2024094593A1 (fr)

Applications Claiming Priority (2)

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DE102022128889.7 2022-11-01
DE102022128889.7A DE102022128889B4 (de) 2022-11-01 2022-11-01 Vorrichtung und Verfahren zum Crimpen einer Flachbahn sowie Maschine zum Herstellen von Papierfiltern

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WO2024094593A1 true WO2024094593A1 (fr) 2024-05-10

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PCT/EP2023/080186 WO2024094593A1 (fr) 2022-11-01 2023-10-30 Dispositif et procédé de sertissage d'une bande plate ainsi que machine de fabrication de filtres-papier

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WO (1) WO2024094593A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2061929A5 (en) * 1969-10-01 1971-06-25 Gall Jean Paul Automatic guarding of sheet processing equip -
JP2004331330A (ja) * 2003-05-08 2004-11-25 Hitachi Chem Co Ltd 接着材テープリール、接着装置及び接続方法
DE102017007455A1 (de) 2017-08-08 2019-02-14 Hauni Maschinenbau Gmbh Maschine der Tabak verarbeitenden Industrie zur gleichzeitigen Herstellung mehrerer Stränge
WO2019123210A1 (fr) 2017-12-22 2019-06-27 G.D S.P.A. Procédé et unité de sertissage d'une bande de matière destinée à l'industrie du tabac
WO2021136612A1 (fr) * 2019-12-30 2021-07-08 Philip Morris Products S.A. Procédé et appareil pour onduler une feuille

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047536A (en) 1974-06-19 1977-09-13 Asfour Emil S Method of making cigarettes and a cigarette made according thereto
DE102019116263A1 (de) 2019-06-14 2020-12-17 Hauni Maschinenbau Gmbh Einrichtung mit einer Mehrfach-Strangbildungsvorrichtung und Verfahren der Tabak verarbeitenden Industrie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2061929A5 (en) * 1969-10-01 1971-06-25 Gall Jean Paul Automatic guarding of sheet processing equip -
JP2004331330A (ja) * 2003-05-08 2004-11-25 Hitachi Chem Co Ltd 接着材テープリール、接着装置及び接続方法
DE102017007455A1 (de) 2017-08-08 2019-02-14 Hauni Maschinenbau Gmbh Maschine der Tabak verarbeitenden Industrie zur gleichzeitigen Herstellung mehrerer Stränge
WO2019123210A1 (fr) 2017-12-22 2019-06-27 G.D S.P.A. Procédé et unité de sertissage d'une bande de matière destinée à l'industrie du tabac
EP3727042A1 (fr) * 2017-12-22 2020-10-28 G.D. S.p.A Procédé et unité de sertissage d'une bande de matière destinée à l'industrie du tabac
WO2021136612A1 (fr) * 2019-12-30 2021-07-08 Philip Morris Products S.A. Procédé et appareil pour onduler une feuille

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