EP3240991A1 - Système de mesure et de régulation d'épaisseur de bande - Google Patents

Système de mesure et de régulation d'épaisseur de bande

Info

Publication number
EP3240991A1
EP3240991A1 EP14909647.1A EP14909647A EP3240991A1 EP 3240991 A1 EP3240991 A1 EP 3240991A1 EP 14909647 A EP14909647 A EP 14909647A EP 3240991 A1 EP3240991 A1 EP 3240991A1
Authority
EP
European Patent Office
Prior art keywords
web
caliper
winding
roll
target
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14909647.1A
Other languages
German (de)
English (en)
Inventor
Gregory Michael Bixler
Vivek Moreshwar Karandikar
Daniel James WILCZYNSKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kimberly Clark Worldwide Inc
Kimberly Clark Corp
Original Assignee
Kimberly Clark Worldwide Inc
Kimberly Clark Corp
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 Kimberly Clark Worldwide Inc, Kimberly Clark Corp filed Critical Kimberly Clark Worldwide Inc
Publication of EP3240991A1 publication Critical patent/EP3240991A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B65H26/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to a predetermined diameter
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • 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
    • B65H26/04—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs for variation in tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1924—Napkins or tissues, e.g. dressings, toweling, serviettes, kitchen paper and compresses

Definitions

  • the properties of the web are monitored by means of on-line measurements.
  • the measurements are conducted in the cross-machine direction (CD) of the web in order to produce a CD profile of the measured property.
  • CD cross-machine direction
  • the measurements are performed by means of measuring apparatuses in which the moving web is measured by means of a measuring sensor moving back and forth in the CD.
  • the properties to be measured may include, for example, moisture, caliper, basis weight, ash content, color, opacity, brightness, gloss, or smoothness of the web.
  • the results obtained from the measuring sensors are used not only for monitoring the properties of the web, but also for controlling the manufacturing and converting processes.
  • the measurement results may be transmitted to a control unit where they are utilized to determine control signals for profiling apparatuses belonging to either the manufacturing or converting process. Based upon the control signal the manufacturing or converting process may be adjusted to alter the CD properties of the web.
  • the present invention provides a method of using a winding apparatus to wind tissue web onto a core to form a rolled tissue product, comprising the steps of providing a first winding algorithm; winding the tissue web about the core in accordance with the first winding algorithm; measuring the caliper of the web across at least a portion of the cross-machine direction of the web, such as across at least a 2.0 cm portion of the web and more preferably at least a 3.0 cm portion of the web; comparing the measured caliper to a target caliper value; providing a second winding algorithm based upon the comparison of the measured caliper to the target caliper; and adjusting at least one winding parameter in accordance with the second winding algorithm.
  • the present invention provides a web winding and measuring system, comprising a calender system; a rotatably-mounted spool onto which a web of material is wound to form a roll; a draw roll over which a web of material is conveyed prior to being wound to form a roll; a light-emitting device configured to illuminate the web as it is conveyed over the draw roll, providing a line on the upper surface of the web in a cross-machine direction; a light-receiving device configured to detect the line; a means for generating measurement data from the detected line; a computing device communicatively coupled to the light-receiving device and configured to receive the measurement data and calculate web caliper; a comparison means for comparing the calculated web caliper to a target web caliper value and determining whether the target web caliper has been achieved, upon determining that the at least one target characteristic has not been achieved, determine an adjustment to at least one parameter to achieve the target characteristic; and adjust the at least one parameter based
  • the present invention provides a web winding and measuring system, comprising a web tensioning system; a rotatably-mounted spool onto which a web of material is wound to form a roll; a draw roll over which a web of material is conveyed prior to being wound to form a roll; a light-emitting device configured to illuminate the web as it is conveyed over the draw roll, providing a line on the upper surface of the web in a cross-machine direction; a light-receiving device configured to detect the line; a means for generating measurement data from the detected line; a computing device communicatively coupled to the light-receiving device and configured to receive the measurement data and calculate web caliper; a comparison means for comparing the calculated web caliper to a target web caliper value and determining whether the target web caliper has been achieved, upon determining that the at least one target characteristic has not been achieved, determine an adjustment to at least one parameter to achieve the target characteristic; and adjust the at least one parameter
  • FIG. 1 is a schematic diagram of one embodiment of a caliper measurement and web handling system for winding a roll of web material
  • FIG. 2 is a block chart of a control method for controlling the caliper of a web
  • FIG. 3 illustrates a caliper measuring device useful in the present invention
  • FIG. 4 is a schematic diagram of another embodiment of a caliper measurement and web handling system for winding roll of web material.
  • the present invention solves the problem of accurately measuring the thickness of a moving web, and in certain embodiments a non-planar web being conveyed over a conveying surface, and making adjustments to the web converting machinery based upon the measured web caliper.
  • the web caliper is measured without contacting the web and in real time while the web is being conveyed at high rates of speed.
  • the method provides for caliper measurement across at least a portion of the web in the cross-machine direction, which further improves the accuracy of the caliper measurement and is a significant improvement over single point measurements.
  • a three dimensional image of the web surface may be generated. The three-dimensional image not only provides for a highly accurate caliper measurement, but provides the additional benefit of enabling the detection of flaws in the web.
  • the accurate and continuous measurement of web caliper may be used to improve the manufacture and processing of the web.
  • winding of the web may be improved by enabling compressive strain to be accurately determined and continuously monitored during winding.
  • Compressive strain is determined from the difference between the actual thickness of the layers of material on the roll and the theoretical thickness of layers of material wound with no compressive strain.
  • the actual thickness of the layers of material on the roll is obtained by accurately measuring the length of material in each layer on the roll and hence the diameter of each layer.
  • the thickness of a band comprising a number of layers can be calculated from the difference of the diameters of its inner and outer layers.
  • Accurate web caliper measurement may also enable more accurate web tension control.
  • the measured caliper may be used to calculate sheet density, which may be in-turn used to adjust the metered winding algorithm. Adjustments to the winding algorithm may control the rotational speed of the mandrel in order to maintain the web of material under constant tension.
  • Measurement of web caliper may also be used to control the tension of the web as it is fed to the log winding device.
  • the web may be trained around a driven draw roll and then passed through a dancer assembly. From there, it may be trained under a guide roll and drawn into the log winding device.
  • the dancer assembly moves from its reference position to lengthen or shorten the web path as necessary to maintain uniform tension in the web.
  • the dancer motion may be controlled by applying a drive torque or a holdback torque to the draw roll depending on detected web caliper. That, in turn, decreases or increases the tension in the web entering the dancer assembly as needed to return the dancer assembly to its reference position.
  • the accurate and continuous measurement of web caliper may be used to adjust web caliper prior to winding the web into a rolled product, such as by adjusting calendering of the web.
  • the caliper of the web may be measured prior to winding, and more preferably immediately prior to winding, to generate a first caliper measurement value.
  • the first caliper measurement value may be compared to a desired caliper measurement value to yield a determined caliper differential, which may be in-turn be used to adjust the calendering system load profile.
  • the web 40 is a tissue web, such as paper towels, toilet paper, or facial tissue, which is wound into a roll 90.
  • a tissue web 40 is unwound from a parent roll (not illustrated) and passed through a caliper control device 12.
  • the caliper control device 12 may be, for example, a calendering system comprising a top roller 14 spaced from a bottom roller 16. The rollers 14 and 16 form a nip 18 through which the web 40 is fed. By applying pressure to the web, the thickness or caliper of the web may be reduced.
  • the calendering device may be a gap calendering device or a contact calendering device.
  • the rollers 14 and 16 may be steel rollers, rubber-coated rollers, or mixtures thereof.
  • any suitable caliper control device may be used in accordance with the present invention.
  • an embossing device may be used in order to control the caliper of the web.
  • the caliper may be controlled by adjusting tension in the web as the web is unwound from the parent roll.
  • Tension control devices are well known in the art and may include, for example, a dancer roll.
  • the relative position of the rollers 14, 16 that make up the calender unit may be controlled by one or more hydraulic actuators 15, 17.
  • Useful hydraulic actuators are known in the art and may comprise a hydraulic cylinder 22 and a moveable arm 23.
  • the oil pressure prevailing in the actuator 21 can be adjusted by means of a hydraulic pressure control unit 26, which may be a programmable logic controller (PLC), thus attaining the desired linear pressure profile in the calender nip 18.
  • PLC programmable logic controller
  • first 14 and second 16 opposed calender rollers are held by two hydraulic actuators 15, 17, which act on the mounting faces of the rollers.
  • the bottom roller 14 is held in a predetermined position.
  • the position of the second roller 16 is adjusted by lowering or raising with the aid of the upper hydraulic actuator 17.
  • This pressure can be increased with the aid of a loading device, which in one embodiment acts on the top roller with a downward force and, in an exemplary embodiment, consists of a hydraulic actuator 17 capable of inserting small increases of downward force on the two mounting faces of the top roller 14. While this is an exemplary embodiment of a calendering operation the specific structure of the calendering stack is not critical to the functioning of the invention.
  • the web 40 leaves the calender nip 18 it is passed over a series of draw rolls 30, 32, 34, 36 and finally to a log winding device (one embodiment illustrated further in FIG. 4) to be wound into a roll 90.
  • a log winding device one embodiment illustrated further in FIG. 4
  • the winding device may be a surface winding device, a center winding device, a coreless winding device, or the like.
  • the system further comprises a first computing device 102 communicatively coupled to a hydraulic pressure control unit 26, which is in-turn communicatively coupled to a hydraulic actuator 21.
  • the hydraulic actuator 21 comprises a moveable arm 23 which is in communication with a calender roll 16 to move the roll from a first to a second position.
  • the system 100 comprises a caliper meter 50 communicatively coupled to the interface board 124.
  • the interface board 124 may be communicatively coupled to a router or switch 126, which is in communication with the first computing device 102 and the PLC 26.
  • a second computing device is communicatively coupled to the PLC.
  • the first computing device 102 generates instructions for configuring the PLC 26 to control the actuator 21. More specifically, the first computing device 102 generates instructions based on predetermined parameters for controlling winding of a web 40 into a roll 90. The parameters incorporate assumptions regarding, for example, the density and compressibility of the finished roll 90, a target number of sheets in the finished roll 90, and a target diameter of the finished roll 90.
  • the first computing device 102 configures the PLC 26 to operate in accordance with the parameters. More specifically, the PLC 26 transmits instructions to the actuator 21 to operate the calender system 12 according to caliper loading algorithm 24 based on the parameters.
  • the caliper loading algorithm 24 dictates the relative position of the first 14 and second 16 calender rolls, which in-turn affects the calender nip pressure, based on the parameters.
  • the caliper meter 50 repeatedly emits light 52 towards the upper surface 42 of the web 40 and samples the light to generate measurement data.
  • the caliper meter 50 transmits the measurement data to the interface board 124.
  • the interface board 124 may further be configured to receive additional information regarding the web, the roll and the winding device, such as the relative position of the winding device mandrel, the web tension and speed of the winding device.
  • the interface board 124 transmits the measurement data to the first computing device 102.
  • the first computing device 102 receives the measurement data from the interface board 124 and calculates the web caliper (M c ). As the web 40 is continuously wound into rolls 90 the caliper meter 50 repeatedly generates measurement data and transmits the measurement data to the first computing device 102 through the interface board 124. Accordingly, the first computing device 102 continuously collects measurement data and repeatedly calculates the caliper of the web as the roll 90 grows. In some embodiments, the first computing device 102 generates, in memory, a three dimensional profile of the web of material based on the collected measurement data.
  • the first computing device 102 determines at least one target characteristic of the roll 90 to be achieved by the web winding and measuring system 100 and analyzes the measurement data to determine whether the at least one target characteristic has been achieved.
  • the at least one target characteristic may include, for example, a target number of sheets of the roll 90, a target diameter for the roll 90, and/or a target ratio of a number of sheets of the roll 90 to a diameter of the roll 90.
  • the first computing device 102 upon determining that the at least one target characteristic has not been achieved, determines an adjustment to at least one parameter to achieve the target characteristic.
  • the first computing device 102 then transmits the at least one adjusted parameter to the first computing device to the PLC 26 to cause the PLC 26 to be configured based on the at least one adjusted parameter.
  • the first computing device 102 determines, for example, an adjustment to the calender nip pressure by the actuator 21 .
  • the first computing device 102 generates a mathematical model of how the starting parameters and operating parameters affect the resulting characteristics of a roll.
  • the first computing device 102 generates the mathematical model by applying one or more statistical techniques, such as linear or polynomial regression, and/or principal component analysis to the collected data to determine how parameters affect the resulting characteristics of a roll and which parameters have the most influence in affecting the resulting characteristics of the roll.
  • an operator of the web winding and measuring system may execute a simulation of forming a roll, based on the parameters, prior to actually forming the roll on the web winding and measuring system.
  • an operator may enter a set of target characteristics and starting parameters into the first computing device and the first computing device provides the operator with a set of operating parameters required to achieve the target characteristics, based on the mathematical model.
  • the first computing device may be configured with a comparison means that compare the measured caliper values to the target caliper values. On the basis of the comparison, the comparison means forms an error profile that may be used to determine a corrected error profile.
  • the corrected error profile may be transmitted to the PLC for controlling the calender nip load. For example, using the corrected error profile a new control signal may be transmitted to one or more actuators to adjust the calender nip pressure.
  • the first computing device 102 may comprise a comparison means to which the measurement results (M c ) are input.
  • the target web caliper (T c ) values are also input in the comparison means.
  • the comparison means compares the measured values of the process with the target web caliper values and forms an error profile PD on the basis of the comparison, which profile is sent to the PLC 26.
  • the PLC 26 comprises control algorithms forming control signals (C) on the basis of the error profile PD, which control signals are sent to one or several actuators affecting the relative position of the calender roils and in-turn the calender nip profile and load.
  • the calender unit may comprise a plurality of actuators arranged across the width of the web so that they each have a separate area of influence in the cross-machine direction of the web.
  • the control signals C cause the necessary change in the operation of the actuator, thus affecting the caliper of the web across the entire cross-machine direction.
  • the control unit updates the error profile PD for example constantly in accordance with a given measurement cycle, time or control interval, producing the control commands C typically on the basis of the last error profile.
  • the error profile Po can be calculated for example at intervals of two measurement scans across the width of the web.
  • control unit comprises means for controlling the manufacturing or finishing process of a web.
  • control unit may also comprise other means.
  • the steps of the above-described control method can be performed by a program, for example a microprocessor.
  • the means may be composed of one or more microprocessors and the application software contained therein.
  • the means may also comprise means for transmission of information and signals between the means. In this example, there are several means carrying out the steps, but the different steps of the method can also be performed in a single means.
  • the means for determining the corrected error profile can be arranged as an independent part of the control unit, or they can be integrated as a part of the control means.
  • the means for determining the corrected error profile can also be arranged as a separate program unit outside the control unit.
  • the control unit and the means for determining the corrected error profile have been provided with means for transmitting information between them.
  • the measurement results measured by the measuring devices can be transmitted to the control unit via conductors or wirelessly. If the measurements are transmitted to the control unit wirelessly, the measuring means are provided with a transmitter for transmitting measurement results, and the control unit is provided with a receiver for receiving measurement results.
  • the control commands produced by the control unit can also be conveyed to the control unit either via conductors or wirelessly. If the control commands are transmitted to the actuators wirelessly, the control unit is provided with a transmitter for transmitting control commands and the actuator is provided with a receiver for receiving control commands.
  • FIG. 3 a caliper measurement device 50 useful in obtaining caliper measurement data is illustrated in greater detail.
  • the caliper measurement device 50 comprises radiation source 51 positioned so as to illuminate the upper surface 42 of the web and in certain embodiments the surface 38 of the draw roll 38.
  • the caliper measurement device 50 may comprise a multi-point triangulation-based sensor which is well known in the art.
  • US Patent No. 4,937,445 discloses a sensor head capable of measuring the dimensions of a workpiece b illuminating the workpiece with a plurality of light sources and then aligning a series of spots reflected from a workpiece using a camera that lies in the same plane as both the spots and the light sources.
  • the caliper measurement device 50 comprises a radiation source 51 which generates a line 45 generally oriented in the cross-machine direction (CD), which is generally perpendicular to the machine direction (MD).
  • the caliper measurement device 50 further comprises a detector 48 configured to detect radiation reflected from the surfaces of the upper surface 42 of the web 40 or the surface 38 of the draw roll 38.
  • the radiation source 51 and detector 46 are generally illustrated as being contained within a single apparatus, i.e., caliper measurement device 50, however, in certain embodiments the devices may be housed separately.
  • the radiation source may be any structure for generating an illumination line, such as a laser or narrow-band light emitting diode (LED) and optics for focus and fine line generation.
  • the radiation source could generate radiation with substantially identical visible or other wavelengths, although different wavelengths can be used. For instance, near-infrared (NIR) wavelengths could be used.
  • the radiation source may produce radiation continuously or in a pulsed fashion, meaning the illumination line 45 could be generated intermittently or continuously.
  • the radiation source projects a reference laser plane towards the upper web 42 and forms a line 45 in the cross- machine direction on the surface 42 of the web 40. While the line is illustrated as being projected normal to the nominal web surface other angles maybe used so long as the line illuminates a portion of both the web surface and the conveyor surface.
  • the line measures at least about 1.0 cm, still more preferably at least about 2.0 cm and still more preferably at least about 3.0 cm, such as from about 3.0 to about 10.0 cm.
  • the detector 46 detects the illuminated line 45.
  • the detector 46 may be any suitable structure for capturing information about lines projected onto a sheet.
  • the detector 46 comprises a lens 47 and a detector array 48.
  • the lens 47 may include filters to exclude unwanted wavelengths of light from acquired images.
  • the detector array 48 may be photo-detector arrays of either linear or matrix types, or Position sensing photodiodes (PSDs) which provide image position data as a voltage. Where photo-detector arrays are used, processing to determine zone image position can use threshoided centroids and multiple centroids or first moment calculations.
  • Suitable detector arrays include, for example, a charge-coupled device (CCD), a complementary metal oxide semiconductor (CMOS) device, or a charge injection device (CID).
  • a single light source 51 projects a line of light 45 such that light is reflected from the upper surface 42 of the web 40 in nominal alignment along a reflection axis.
  • the reflected light is assessed for displacement from a nominal position (for example height of the surface from which the light is reflected, i.e. vertical displacement).
  • a measurement plane is defined to include the reflection axis and the possible displaced locations of the reflections.
  • the reflected light passes through the lens 47 and is detected by the detector array 48.
  • the analysis of the images captured by the detector could be performed by an suitable device or system, in some embodiments, the detector is included within a "smart" camera, where some or all operations in the analysis of an image and the calculation of a triangulated distance to a point are done by the camera itself. In other embodiments, the detector provides images or other information to an external device or system that processes the images and calculates the triangulated distances. For example, as illustrated in FIGS. 1 and 4 the caliper measurement device 50 provides data to an interface board 124, which in-turn transfers data to a computer 102 for calculation of distances based upon triangulation, analysis of the distance data and ultimately calculation of web caliper (C).
  • the distance between the surface 38 of the draw roll 36 and the caliper measuring device 50 is first determined by illuminating the surface 38 with a line of light 45 prior to the web 40 being conveyed over the surface 38 of the draw roll 36.
  • the caliper measuring device 50 is located a distance H above the surface 38 and a horizontal distance x from radiation source 51.
  • Detector 48 detects the line 45.
  • a computerized Image processing unit 102 computes the height (H1) from the caliper measuring device 50 to the surface 38 by applying the formula:
  • ⁇ is the angle at which detector 48 views line 45.
  • H2 A second measurement (H2) is taken once the web 40 is being conveyed along the surface 38 of the draw roll 36. With the addition of the web 40 to the draw roll surface 38 the height increases causing ⁇ to increase. Further as the height of the web relative to the surface of the draw roll increases and decreases the value of ⁇ increases and decreases.
  • the actual position of line 45 and the vertical distance of line 45 above the surface 38 of the draw roll 36 can be determined by triangulation. It is a straightforward image processing task to determine the angle ⁇ and the height (H2) from the images captured by the camera. Once H2 is determined, caliper (C) of the web 40 is calculated by simply subtracting H1 from H2. Although the camera cannot see the bottom surface of the web (surface opposite the upper surface 42), it is assumed that the lower surface lies substantially in-plane with the known plane of the conveyor surface 16.
  • the height of the draw roll surface (H1) and the height of the web (H2) are measured concurrently by illuminating the upper surface of the web and the draw roll surface concurrently as the web is conveyed across the surface.
  • the upper web 40 surface 42 and the draw roll surface 38 are illuminated using a radiation source 51 to form a line 45 disposed substantially in the cross-machine direction of the web 40 normal to the machine direction and the direction of travel of the web.
  • the line 45 extends beyond the edge 44 of the web 40 and onto the surface 38 of the draw roll 36.
  • a matrix array is used to sense the line 45.
  • a contour of the web surface 42 is produced by the light section principle, and the location of the edge 44 can be determined by the location of rapid contour fall of the image. For example, by sequentially scanning lines of the array of the first location at which the line location is for example, 100 pixels less than the previous, can be chosen as the edge 44 of the web 40. The caliper C of the web 40 may then be calculated b simply subtracting H1 from H2.
  • FIG. 4 illustrates an alternate embodiment of a web winding system 100.
  • the system 100 includes a first computing device 102 communicatively coupled to a PLC 204 which controls a log winding apparatus.
  • the PLC 204 is communicatively coupled to a servo drive 206.
  • the servo drive 206 is communicatively coupled to a servo motor 208 and an encoder 210.
  • the servo motor 208 is coupled to a motor pulley.
  • the motor pulley is operatively coupled to a spool pulley through a drive belt.
  • the spool pulley is coupled to a spool. That is, the spool is rotatably mounted to the spool pulley.
  • an encoder 220 is operatively coupled to the spool.
  • the encoder 220 is communicatively coupled to an interface board 124.
  • Other devices for monitoring and measuring winding may be coupled to the spool such as a tension sensor 221 or a humidity sensor 222.
  • a caliper measurement device 50 is communicatively coupled to the interface board 124.
  • the caliper measurement device 50 preferably continuously measures at least a portion of the web caliper in the cross-machine direction as the web is being conveyed over the surface 38 of the draw roll 36 before it is wound into a roll on the mandrel 138.
  • the CD portion of the web measured by the caliper measurement device is at least about 1.0 cm, still more preferably at least about 2.0 cm and still more preferably at least about 3.0 cm, such as from about 3.0 to about 10.0 cm.
  • the interface board 124 is communicatively coupled to a first computing device 102.
  • the first computing device 102 may also be communicatively coupled to a second PLC 26 for controlling a calender unit. Based upon measurement data received from the caliper measurement device 50 the first computing device 102 may generate signals to control the calender device as described above. In this manner measurement data from the caliper measurement device 50 may be transmitted to the first computing device 102 and used to adjust the web caliper by making adjustments to the calender system load profile. The adjusted web caliper may then be measured and fed forward to adjust the metered winding algorithm used to control the winding apparatus and/or one or more components of the winding apparatus.
  • the first computing device 102 generates instructions for configuring the PLC 204 to control the servo drive 206. More specifically, the first computing device 102 generates instructions based on predetermined parameters for controlling winding of a web of material into a roll. The parameters incorporate assumptions regarding, for example, the density and compressibility of the finished roll, a target number of sheets in the finished roll, and a target diameter of the finished roll. The first computing device 102 configures the PLC 204 to operate in accordance with the parameters. More specifically, the PLC 204 transmits instructions to the servo drive 206, to operate the servo motor 208 according to an electronic cam profile based on the parameters.
  • the electronic cam profile dictates positions and velocities for the servo motor 208, based on the parameters.
  • the servo drive 206 transmits power and instructions to the servo motor 208 in accordance with the electronic cam profile and receives feedback regarding the position and/or velocity of the servo motor 208 from the encoder 210.
  • the servo motor 208 rotates the motor pulley which is coupled to the spool pulley by the drive belt.
  • the encoder 220 As the spool pulley rotates the spool the encoder 220 generates position and velocity data about the spool and transmits the data to the interface board 124.
  • a tension sensor 221 measures tension exerted by the spool on a web of material being wound by the spool and transmits tension data to the interface board 124.
  • the caliper measuring device 50 repeatedly emits light 52 towards the web (not illustrated) traveling over the draw roll 36 and samples the light to generate caliper data, as described in more detail above. The caliper measuring device 50 transmits the measurement data to the interface board 124.
  • the first computing device 102 receives the measurement data from the interface board 124 and calculates the caliper of the web. As the web continuously passes over the draw roll 36 and is wound into a web on a core supported by the mandrel 138, the caliper measuring device 50 repeatedly generates measurement data and transmits the measurement data to the first computing device102 through the interface board 124. Accordingly, the first computing device 102 continuously collects measurement data and repeatedly calculates the caliper of the web as the roll grows.
  • the controller may be configured to receive the calculated caliper of the web immediately prior to its being wound into a roll and, based on this information, to then control the metered winding algorithm should the caliper of the web be outside preset limits.
  • the controller can be configured to make adjustments in the amount of tension that is placed upon the web of material during winding.
  • the diameter of the rolls of material produced and/or the firmness of the rolls of material produced may be controlled within preset limits such that every roll produced has substantially uniform and desirable characteristics.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne des systèmes et des procédés pour effectuer des ajustements de la machine de transformation de bande sur la base de l'épaisseur de bande mesurée. Généralement, l'épaisseur de bande est mesurée sans entrer en contact avec la bande et en temps réel pendant que la bande est transportée à des vitesses élevées. Le système de mesure d'épaisseur de bande à étrier peut être utilisé dans le système de transformation de bande pour améliorer le contrôle de l'épaisseur de bande et améliorer l'enroulement. La mesure d'épaisseur de bande peut être retournée à un système de calandrage pour améliorer l'épaisseur de la bande alimentée dans un système d'enroulement, ou bien l'épaisseur peut être transférée au système d'enroulement de bande afin d'améliorer la tension de bande et les performances d'enroulement.
EP14909647.1A 2014-12-30 2014-12-30 Système de mesure et de régulation d'épaisseur de bande Withdrawn EP3240991A1 (fr)

Applications Claiming Priority (1)

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PCT/US2014/072755 WO2016108843A1 (fr) 2014-12-30 2014-12-30 Système de mesure et de régulation d'épaisseur de bande

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EP3240991A1 true EP3240991A1 (fr) 2017-11-08

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US (1) US20170327337A1 (fr)
EP (1) EP3240991A1 (fr)
AU (1) AU2014415595A1 (fr)
BR (1) BR112017013219A2 (fr)
CA (1) CA2970447A1 (fr)
MX (1) MX2017007910A (fr)
WO (1) WO2016108843A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600072709A1 (it) * 2016-07-12 2018-01-12 Perini Fabio Spa Linea di trasformazione per carta tissue e metodo
CA3094144A1 (fr) 2018-04-04 2019-10-10 Paper Converting Machine Company Commande pour appareil de deroulement de rouleau parent et procedes
IT201800006607A1 (it) * 2018-06-25 2019-12-25 Ribobinatrice per la produzione di logs di materiale cartaceo.
WO2020180667A1 (fr) 2019-03-01 2020-09-10 Paper Converting Machine Company Procédés et appareil de bobinage de rebobineuse
US11434096B2 (en) 2019-06-10 2022-09-06 Kimberly-Clark Worldwide, Inc. Adaptive sheet caliper control system and apparatus and methods
US12049372B2 (en) 2020-06-26 2024-07-30 Paper Converting Machine Company Method for producing coreless roll products
SE2230416A1 (en) * 2022-12-15 2024-06-16 Valmet Oy A method of winding a web
CN117622974B (zh) * 2023-12-30 2024-08-09 深圳市赢合科技股份有限公司 一种智能化控制的隔膜分切装置及其分切方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60244750A (ja) * 1984-05-18 1985-12-04 Fuji Photo Film Co Ltd 巻厚検出装置
WO1992019522A1 (fr) * 1991-05-03 1992-11-12 Eastman Kodak Company Commande d'enroulement de bande
US6755940B2 (en) * 2001-12-20 2004-06-29 Kimberly-Clark Worldwide, Inc. Method and apparatus for caliper control of a fibrous web
US20060254367A1 (en) * 2005-05-12 2006-11-16 Abb Ltd. Measurement system for improved paper roll runnability
JP2008205188A (ja) * 2007-02-20 2008-09-04 Mitsubishi Heavy Ind Ltd 膜厚計測方法及びその装置ならびに薄膜製造システム

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Publication number Publication date
WO2016108843A1 (fr) 2016-07-07
CA2970447A1 (fr) 2016-07-07
US20170327337A1 (en) 2017-11-16
MX2017007910A (es) 2017-09-05
AU2014415595A1 (en) 2017-07-20
BR112017013219A2 (pt) 2018-02-06

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