CN108820990B - Method and system applied to paper tension adjustment - Google Patents
Method and system applied to paper tension adjustment Download PDFInfo
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- CN108820990B CN108820990B CN201810522081.XA CN201810522081A CN108820990B CN 108820990 B CN108820990 B CN 108820990B CN 201810522081 A CN201810522081 A CN 201810522081A CN 108820990 B CN108820990 B CN 108820990B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
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- 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
- B65H2701/11—Dimensional aspect of article or web
- B65H2701/113—Size
- B65H2701/1133—Size of webs
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Abstract
The invention relates to the technical field of paper manufacturing, and discloses a method and a system applied to paper tension adjustment. The method comprises the following steps: detecting a first hardness value of the surface of the first web sample; and judging whether the first hardness value is within the hardness threshold range, if not, adjusting the overpressure value of the station corresponding to the first paper roll sample so as to adjust the paper tension of the subsequent paper roll. Through the mode, the paper tension adjusting device can adjust the paper tension.
Description
Technical Field
The invention relates to the technical field of paper manufacturing, in particular to a method and a system applied to paper tension adjustment.
Background
The existing production equipment for papermaking has different degrees of abrasion and control parameter deviation of each papermaking tool in the equipment due to long-time running work. The difficulty of verifying the equipment abrasion and the deviation of the control parameters is high, and the problems of the equipment are often fed back through the quality of product paper. However, the feedback adjustment operation is delayed seriously due to the many processes that the product paper undergoes.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for adjusting paper tension, which can adjust paper tension.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a method for use in paper tensioning, the method comprising: detecting a first hardness value of the surface of the first web sample; and judging whether the first hardness value is within the hardness threshold range, if not, adjusting the overpressure value of the station corresponding to the first paper roll sample so as to adjust the paper tension of the subsequent paper roll.
In an embodiment of the invention, the method further comprises: detecting first hardness values respectively corresponding to a plurality of first detection positions on the surface of a first paper roll sample; respectively judging whether the first hardness values corresponding to the first detection positions are within a hardness threshold range, wherein the first detection positions corresponding to the first hardness values which are not within the hardness threshold range are first defect positions; and adjusting the overpressure value of the station corresponding to the first defect position to adjust the paper tension of the subsequent paper roll.
In an embodiment of the present invention, the step of adjusting the overpressure pressure value of the station corresponding to the first defect position specifically includes: determining a target position of a first defect position on the surface of a first paper roll sample in a first base paper roll; adjusting the overpressure pressure value corresponding to the station where the target position is located to adjust the thickness of paper in a corresponding area in a second original paper roll passing through the station where the target position is located subsequently, so as to adjust the hardness value of the surface of the second original paper roll; wherein the first web sample is taken from a first log.
In an embodiment of the present invention, the step of adjusting the overpressure pressure value of the station corresponding to the first defect location includes: determining a second detection position on the surface of the second original paper roll, and detecting a second hardness value corresponding to the second detection position; wherein, the relative position of the second detection position in the second original paper roll corresponds to the phase position of the first defect position in the first original paper roll; judging whether the second hardness value is within a hardness threshold range, wherein a second detection position corresponding to the second hardness value which is not within the hardness threshold range is a second defect position; and adjusting the fiber content of the sizing agent of the station corresponding to the second defect position so as to adjust the paper tension of the subsequent paper roll.
In an embodiment of the present invention, the step of adjusting the fiber content of the slurry at the station corresponding to the second defect position specifically includes: and adjusting the flow rate of the pulp source corresponding to the station where the second defect position is located to adjust the pulp fiber content of the base paper subsequently formed by the station where the second defect position is located, thereby adjusting the hardness value of the surface of the base paper subsequently formed by the station where the second defect position is located.
In an embodiment of the present invention, the step of detecting the first hardness values respectively corresponding to the plurality of first detection positions on the surface of the first paper roll sample specifically includes: and respectively applying mechanical force action to a plurality of first detection positions on the surface of the first paper roll sample, and counting the characteristic information fed back by each first detection position on the surface of the first paper roll sample to obtain a hardness distribution curve, wherein the hardness distribution curve comprises first hardness values corresponding to each first detection position on the surface of the first paper roll sample.
In an embodiment of the present invention, the step of respectively determining whether the first hardness value corresponding to each first detection position is within the hardness threshold range specifically includes: and obtaining a first hardness value corresponding to each first detection position on the surface of the first paper roll sample from the hardness distribution curve, and comparing the first hardness value with a hardness threshold range respectively.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a system for sheet tension adjustment that is capable of implementing the method for sheet tension adjustment as set forth in the above embodiments.
In an embodiment of the invention, the system comprises a controller and an overpressure device, wherein the controller is connected with the overpressure device, and the controller is used for controlling the overpressure device to adjust overpressure pressures corresponding to different stations.
In an embodiment of the present invention, the system further includes a head box, the head box is provided with different head nozzles corresponding to different stations, and the head box is connected to a controller, and the controller is configured to control the head flows of the different head nozzles to control the fiber contents of the pulp corresponding to the different stations.
The invention has the beneficial effects that: the method is characterized in that a first hardness value of the surface of a first paper roll sample is detected to judge whether the surface tension of the first paper roll sample meets the requirement, and the hardness value of the surface of the first paper roll sample is utilized to reflect the surface tension of the first paper roll sample to a certain extent. And comparing the first hardness value with a hardness threshold range, and judging whether the first hardness value is within the hardness threshold range. And if the first hardness value is not within the hardness threshold range, feeding back the overpressure pressure of the station corresponding to the first paper roll sample, and adjusting the paper tension of the subsequent paper roll by adjusting the overpressure pressure value of the station corresponding to the first paper roll sample.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the method of the present invention applied to sheet tension adjustment;
FIG. 2 is a schematic flow chart of a second embodiment of the method of the present invention applied to sheet tension adjustment;
FIG. 3 is a schematic representation of a first embodiment of a hardness profile of the present invention;
FIG. 4 is a schematic representation of a second embodiment of the hardness profile of the present invention;
FIG. 5 is a schematic representation of a third embodiment of a hardness profile of the present invention;
FIG. 6 is a schematic flow chart of a third embodiment of the method of the present invention applied to sheet tension adjustment;
FIG. 7 is a schematic diagram of an embodiment of the system for adjusting sheet tension according to the present invention;
FIG. 8 is a schematic diagram of the structure of one embodiment of a headbox of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a method for adjusting paper tension according to the present invention.
S101: detecting a first hardness value of the surface of the first web sample;
the hardness of the surface of the first web sample reflects to some extent the surface tension of the first web sample. The embodiment can improve the condition of uneven paper surface tension caused by abrasion of papermaking equipment and parameter deviation by detecting the first hardness value of the surface of the first paper roll sample to evaluate the surface tension of the first paper roll sample.
S102: judging whether the first hardness value is within the hardness threshold range;
in this embodiment, in order to evaluate whether the detected first hardness value on the surface of the first paper roll sample meets the requirement, the first hardness value is compared with the hardness threshold range, and whether the first hardness value is within the hardness threshold range is determined, so as to evaluate whether the first hardness value is reasonable. Wherein the hardness threshold range is a set of first hardness values that the surface of the first web sample meets requirements.
S103: if not, adjusting the overpressure value of the station corresponding to the first paper roll sample to adjust the paper tension of the subsequent paper roll;
in this embodiment, if the detected first hardness value of the surface of the first paper roll sample is not within the above hardness threshold range, it indicates that the first hardness value is not up to the requirement, and the hardness of the area corresponding to the first hardness value on the surface of the first paper roll sample needs to be adjusted. In the paper making process of the paper roll, the process directly related to the surface hardness is a supercalendering process. And adjusting the overpressure value applied to the station corresponding to the first paper roll sample by the supercalendering device to adjust the surface hardness of the subsequent paper roll passing through the station, thereby adjusting the paper tension of the subsequent paper roll.
It can be seen from the above that, the method for adjusting paper tension provided by the present invention determines whether the surface tension of the first paper roll sample meets the requirement by detecting the first hardness value of the surface of the first paper roll sample, and reflects the surface tension of the first paper roll sample to a certain extent by using the hardness value of the surface of the first paper roll sample. And comparing the first hardness value with a hardness threshold range, and judging whether the first hardness value is within the hardness threshold range. And if the first hardness value is not within the hardness threshold range, feeding back the overpressure pressure of the station corresponding to the first paper roll sample, and adjusting the paper tension of the subsequent paper roll by adjusting the overpressure pressure value of the station corresponding to the first paper roll sample.
Referring to fig. 2, fig. 2 is a schematic flow chart of a second embodiment of a method for adjusting paper tension according to the present invention.
Because the paper making equipment runs for a long time, the paper making equipment has abrasion and production parameter deviation in different degrees, so that the paper produced by the paper making equipment has quality problems in different degrees, one of which is the quality problem of uneven surface tension of the paper. By comparing the corresponding relationship between the surface tension of the paper and the papermaking conditions of each section of the process for a long time, the fact that the uniformity of the surface hardness of the paper directly affects the tension uniformity of the paper is found, specifically, the uniformity of the surface hardness of the paper is good, and the uniformity of the surface tension of the paper is also good. Therefore, the method for adjusting the paper tension described in this embodiment utilizes the uniformity of the paper surface hardness to evaluate the uniformity of the paper surface tension, and adjusts the relevant production parameters to improve the uniformity of the paper surface tension.
It should be noted that the method for adjusting the paper tension described in this embodiment includes, but is not limited to, the following steps.
S201: detecting first hardness values respectively corresponding to a plurality of first detection positions on the surface of a first paper roll sample;
in this embodiment, a first log sample is taken from a first log produced by a papermaking apparatus to test for uniformity of surface hardness of the first log. The method can be implemented by cutting a plurality of first paper roll samples from different positions of a first original paper roll for sampling evaluation, selecting a plurality of first detection positions on the surface of the first paper roll sample, and respectively detecting hardness values corresponding to the plurality of first detection positions, namely first hardness values. And evaluating the tension uniformity of the surface of the first paper roll sample according to the first hardness value distribution of the surface of the first paper roll sample.
In an embodiment of the present invention, the first hardness values respectively corresponding to a plurality of first detection positions on the surface of the first paper roll sample may specifically be: and respectively applying mechanical force action (such as knocking force) to the plurality of first detection positions on the surface of the first paper roll sample, feeding back characteristic information after the surface of the first paper roll sample receives the mechanical force action, converting the fed-back characteristic information into corresponding hardness values, and counting the characteristic information fed back by each first detection position on the surface of the first paper roll sample to obtain hardness distribution curves of the plurality of first detection positions, wherein the hardness distribution curves comprise the first hardness values corresponding to each first detection position on the surface of the first paper roll sample.
For example, in a papermaking line, workers often use a specific instrument to measure a first hardness value of the surface of a first web sample. Specifically, the instrument is held by a worker and moves at a constant speed in the width direction of the first paper roll sample, and the instrument respectively exerts mechanical force on a plurality of first detection positions in the width direction of the first paper roll sample so as to finish the detection of the surface hardness of the first paper roll sample and draw a hardness distribution curve.
S202: respectively judging whether the first hardness values corresponding to the first detection positions are within a hardness threshold range, wherein the first detection positions corresponding to the first hardness values which are not within the hardness threshold range are first defect positions;
in this embodiment, in order to evaluate whether the uniformity of the hardness distribution on the surface of the first paper roll sample meets the requirement of making the surface tension of the first paper roll sample uniform, the first hardness values of the first detection positions on the surface of the first paper roll sample need to be evaluated respectively. If the first hardness values of the first detection positions are all in a reasonable range, the surface hardness distribution of the first paper roll sample is uniform, and if the first hardness values of part of the first detection positions are not in the reasonable range, the first hardness values of the first detection positions need to be adjusted, so that the surface hardness distribution of the first paper roll sample is uniform. The hardness threshold ranges set forth in this example define a reasonable range of hardness for the surface of the roll.
The method specifically comprises the following steps: and reading the first hardness values corresponding to the first detection positions on the surface of the first paper roll sample from the hardness distribution curve obtained in the step, and respectively comparing the first hardness values with the hardness threshold range, namely respectively judging whether the first hardness values corresponding to the first detection positions are within the hardness threshold range. The first hardness values corresponding to the first detection positions are reasonable hardness values within the hardness threshold range, the work stations corresponding to the first detection positions which are not within the hardness threshold range are positions needing hardness adjustment, and the first detection positions are defined as first defect positions. The hardness distribution curve is shown in fig. 3, wherein a is a first hardness value coordinate axis, d is a distance coordinate axis in the width direction of the first paper roll sample, and w is a hardness threshold range. As can be seen from the figure, each node in the hardness distribution curve is the first hardness value of the first detection position, wherein the first hardness values b1 and b2 are outside the hardness threshold range w, and therefore the first detection positions corresponding to the first hardness values b1 and b2 are the first defect positions.
It should be noted that the hardness threshold range is summarized by collecting a large amount of production data for a long time and according to information fed back by a user, reflects a reasonable range that the hardness of each position of paper of the paper roll can meet the use requirements of the user, and continuously adjusts according to the feedback information of the production process and the use process of the user so that the uniformity of the hardness distribution of the paper reaches different aspects and the requirements of the user. Moreover, the hardness distribution of the surface of the first paper roll sample in the width direction is different, and the corresponding hardness threshold value range is also different. For example, the hardness profile shown in FIG. 4 exhibits a generally single-sided slope; the hardness distribution curve shown in FIG. 5 is generally smooth, but the difference between the high and low values is large and is distributed in a zigzag manner. The hardness distribution curves of fig. 4 and 5 have different trends, and the hardness threshold ranges corresponding to the trends are different. And the hardness value uniformity in the width direction of the surface of the paper roll is further optimized by selecting a reasonable hardness threshold range. In the embodiment, a reasonable hardness threshold range is selected to participate in adjustment according to the hardness distribution condition of the surface of the first paper roll sample in the width direction.
In addition, a plurality of different stations are correspondingly arranged in the paper making equipment along the width direction of the paper roll, and each station respectively controls the preparation and production of paper in a certain area on the paper roll along the width direction. The papermaking equipment is provided with different production parameters aiming at different stations, so that the stations jointly participate in the preparation production work of an integral paper roll, namely, a plurality of areas of the final finished paper roll along the width direction of the paper roll respectively correspond to one station. It can be understood that the stations of the paper making equipment used in each process on the paper making production line correspond to each other, that is, the product of a certain station of the paper making equipment in the previous process is transmitted to the corresponding station of the paper making equipment in the next process for further processing and production.
S203: adjusting the overpressure value of the station corresponding to the first defect position to adjust the paper tension of the subsequent paper roll;
in this embodiment, the first hardness value corresponding to the first defect position is not within the hardness threshold range, so that the surface hardness distribution of the first paper roll sample is uneven, which causes the surface tension of the first paper roll sample to be uneven, and the paper surface of the first paper roll sample is prone to be broken. In the paper-making production line, the process directly related to the surface hardness of the first paper roll sample is a supercalendering process, and the hardness of the paper surface is adjusted by overpressure pressure applied to the paper surface in the supercalendering process, so that when the first hardness value of the first defect position is poor, the first hardness value is fed back to the supercalendering process, and the overpressure pressure value of the station corresponding to the first defect position is adjusted to improve the hardness distribution of the subsequent paper roll, thereby adjusting the paper tension of the subsequent paper roll.
In an embodiment of the present invention, the adjusting the overpressure pressure value of the station corresponding to the first defect position may specifically be: a target location in a first parent roll of a first defect location on a surface of a first roll sample is determined (wherein the first roll sample is taken from the first parent roll. the error in tracking the first defect location to the target location can be accurate to within 1 cm). And adjusting the overpressure pressure value corresponding to the station where the target position is located to adjust the thickness of the paper in the corresponding area of the second original paper roll (namely the subsequent paper roll) passing through the station where the target position is located, and changing the fiber distribution of the corresponding paper surface area in the second original paper roll to adjust the hardness of the paper surface area, so that the hardness value of the surface of the second original paper roll is adjusted. For example, if the first hardness value fed back by the first defect position is lower, it indicates that the paper at the first defect position is slightly pressed, and correspondingly, the overpressure pressure value corresponding to the station where the target position is located is appropriately reduced; or if the first hardness value fed back by the first defect position is higher, the overpressure pressure applied to the paper at the first defect position is smaller, the thickness of the paper is thicker, and the overpressure pressure value corresponding to the station where the target position is located is correspondingly and properly increased.
It should be noted that, since the first defect location is a point on the surface of the first sample roll, and the station where the target location is located is a regional concept, the adjustment of the overpressure pressure corresponding to the first defect location will affect the overpressure pressure value of the whole region of the station. Therefore, the adjustment range of the overpressure pressure value is small, adjustment is carried out according to the difference value between the first hardness value of the first defect position and the hardness threshold range, the hardness of the subsequent paper of the station where the target position is located is adjusted to be the edge value closest to the hardness threshold range in the hardness threshold range, and the thickness change of the paper is reflected by the thickness change of the paper scanned in real time, so that whether the thickness of the paper is effectively improved before and after the overpressure pressure adjustment is judged.
It can be seen from the above that the method for adjusting the tension of paper provided by the present invention evaluates the uniformity of the tension on the surface of the first sample roll by the hardness distribution on the surface of the first sample roll. Specifically, first hardness values corresponding to a plurality of first detection positions on the surface of a first paper roll sample are detected and compared with a hardness threshold range, and overpressure pressure values of stations corresponding to first defect positions corresponding to the first hardness values not within the hardness threshold range are adjusted to adjust the surface hardness of paper rolls passing through the stations subsequently, so that the paper tension of the subsequent paper rolls is adjusted.
Referring to fig. 6, fig. 6 is a schematic flow chart of a third embodiment of a method for adjusting paper tension according to the present invention.
Since the adjustment range of the overpressure pressure value has the maximum value, that is, when the adjustment of the overpressure pressure value reaches the maximum adjustment range, the hardness of the surface of the paper passing through the station where the target position corresponding to the first defect position is located cannot be adjusted to be within the hardness threshold range, the pulp fiber content and the distribution state of the base paper corresponding to the station need to be further adjusted.
The first defect position which cannot be completely corrected by adjusting overpressure pressure exists on the surface of the first paper roll sample, and the reason is that in the pulp forming link of the first raw paper roll corresponding to the first paper roll sample, the thickness of the first raw paper roll in the width direction of the first raw paper roll is not uniform due to different pulp fiber contents in pulp corresponding to different stations and different distribution uniformity of the pulp fibers, and even if the thickness of the first raw paper roll is roughly controlled to be relatively flat through soft-pressing pressure, a position/area with large thickness difference still exists. The thickness of the paper with the partial position/area with the thickness difference can be adjusted to a reasonable range through the supercalendering link, and the thickness of the partial position/area of the first original paper roll can not be adjusted to the reasonable range even if the thickness is adjusted through the supercalendering link, so that the pulp fiber content of the paper pulp corresponding to the relevant station is required to participate in the hardness adjustment.
The method for adjusting the paper tension provided by this embodiment combines the adjustment of overpressure pressure and the adjustment of the fiber content of the base paper pulp to adjust the surface hardness distribution of the paper roll. Including but not limited to the following steps.
S301: detecting first hardness values respectively corresponding to a plurality of first detection positions on the surface of a first paper roll sample;
in this embodiment, a first log sample is taken from a first log produced by a papermaking apparatus to test for uniformity of surface hardness of the first log. The method can be implemented by cutting a plurality of first paper roll samples from different positions of a first original paper roll for sampling evaluation, selecting a plurality of first detection positions on the surface of the first paper roll sample, and respectively detecting hardness values corresponding to the plurality of first detection positions, namely first hardness values. And evaluating the tension uniformity of the surface of the first paper roll sample according to the first hardness value distribution of the surface of the first paper roll sample.
S302: respectively judging whether the first hardness values corresponding to the first detection positions are within a hardness threshold range, wherein the first detection positions corresponding to the first hardness values which are not within the hardness threshold range are first defect positions;
in this embodiment, in order to evaluate whether the uniformity of the hardness distribution on the surface of the first paper roll sample meets the requirement of making the surface tension of the first paper roll sample uniform, the first hardness values of the first detection positions on the surface of the first paper roll sample need to be evaluated respectively. If the first hardness values of the first detection positions are all in a reasonable range, the surface hardness distribution of the first paper roll sample is uniform, and if the first hardness values of part of the first detection positions are not in the reasonable range, the first hardness values of the first detection positions need to be adjusted, so that the surface hardness distribution of the first paper roll sample is uniform. The hardness threshold ranges set forth in this example define a reasonable range of hardness for the surface of the roll.
S303: adjusting the overpressure value of the station corresponding to the first defect position to adjust the paper tension of the subsequent second original paper roll;
in this embodiment, the first hardness value corresponding to the first defect position is not within the hardness threshold range, so that the surface hardness distribution of the first paper roll sample is uneven, which causes the surface tension of the first paper roll sample to be uneven, and the paper surface of the first paper roll sample is prone to be broken. In the paper-making production line, the process directly related to the surface hardness of the first paper roll sample is a supercalendering process, and the hardness of the paper surface is adjusted by overpressure pressure applied to the paper surface in the supercalendering process, so that when the first hardness value of the first defect position is poor, the embodiment feeds back the first hardness value to the supercalendering process to improve the hardness distribution of the subsequent paper roll by adjusting the overpressure pressure value of the station corresponding to the first defect position, thereby adjusting the paper tension of the subsequent paper roll (such as a second original paper roll and the like).
S304: determining a second detection position on the surface of the second original paper roll, and detecting a second hardness value corresponding to the second detection position;
in this embodiment, in order to detect whether the hardness of the paper produced at the station corresponding to the first defect position on the surface of the original first original roll is adjusted to be within the hardness threshold range after the overpressure pressure adjustment, a second detection position is determined on the surface of the second original roll, and a second hardness value corresponding to the second detection position is detected. The width of the first original paper roll is the same as that of the second original paper roll, and the relative position of the second detection position in the second original paper roll corresponds to the phase position of the first defect position in the first original paper roll, so that the second detection position corresponds to the first defect position, and whether overpressure pressure adjustment of a station corresponding to the first defect position adjusts the hardness of a paper surface area (namely, the second detection position) corresponding to the station in a subsequent paper roll (namely, the second original paper roll) to be within a hardness threshold range is verified. At least one first defect position exists on the surface of the first base paper roll, and correspondingly, the number of second detection positions determined on the surface of the second base paper roll is the same as that of the first defect positions.
S305: judging whether the second hardness value is within a hardness threshold range, wherein a second detection position corresponding to the second hardness value which is not within the hardness threshold range is a second defect position;
in this embodiment, the second hardness value is compared with the hardness threshold range to determine whether the second hardness value is within the hardness threshold range. The hardness threshold range is described in detail in the above embodiments, and is not described herein. And defining a second detection position corresponding to a second hardness value which is not within the hardness threshold range as a second defect position, wherein after the overpressure pressure of the corresponding station in the second defect position, namely the first defect position, is adjusted, the hardness of the surface area of the paper corresponding to the station still cannot be adjusted to the first defect position within the hardness threshold range. The fiber content of the pulp slurry at the station corresponding to the second defect position needs to participate in the hardness adjustment.
S306: adjusting the content of pulp fibers of a station corresponding to the second defect position to adjust the paper tension of a subsequent paper roll;
in this embodiment, the second base roll has a plurality of different stations corresponding to the width direction thereof, and the different stations participate in the processes of base paper forming, paper making and the like of the second base roll. In the forming link of the second raw paper roll, different stations are respectively corresponding to pulp sources so as to provide pulp for forming the raw paper at the stations. The content and distribution state of pulp fibers in the pulp corresponding to different stations will affect the quality (e.g. hardness value, etc.) of the subsequent forming base paper. In this embodiment, the content of the pulp fibers of the base paper subsequently formed at the station where the second defect position is located is adjusted by adjusting the content of the pulp fibers of the station corresponding to the second defect position, so that the hardness value of the surface of the base paper subsequently formed at the station where the second defect position is located is adjusted, and the hardness of the surface of the paper is further adjusted on the basis of adjusting the overpressure pressure. The method specifically comprises the following steps: after the overpressure pressure of the station corresponding to the first defect position is adjusted, the hardness of the area of the surface of the second raw paper roll corresponding to the station is still relatively small, which indicates that the content of the pulp fibers corresponding to the station is relatively low, and the pulp flow of the pulp source corresponding to the station is properly increased to increase the content of the pulp fibers corresponding to the station, otherwise, the reverse is performed.
It should be noted that the method for adjusting the paper tension described in this embodiment utilizes the uniformity of the surface hardness distribution of the paper roll to evaluate the uniformity of the surface tension. When the defect of uniformity of the surface hardness distribution of the paper roll is detected, the paper roll is fed back to a supercalendering link, and hardness adjustment is performed in advance (an adjustment result can be obtained within 2 hours generally) so as to solve the problem of hysteresis of the feedback adjustment of the paper tension. And the adjustment effect of the surface hardness of the paper roll is improved by adjusting the pulp fiber content of the base paper pulp.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a system for adjusting paper tension according to the present invention.
In this embodiment, the system 1 for adjusting paper tension can implement the method for adjusting paper tension described in the above embodiments, and will not be described herein again.
Further, the system 1 comprises a controller 11 and an overpressure device 12, wherein the overpressure device 12 is a device used for applying overpressure pressure on the surface of the paper in the paper making process to perform the supercalendering process. The overpressure device 12 may in particular be a supercalender or the like. The super calender consists of metal rollers and paper pulp rollers which are arranged vertically at intervals. During operation, the glossiness, smoothness and tightness of paper are further improved due to the fact that the number of rollers is large, linear pressure is large, and friction is generated on paper surfaces due to deformation of paper pulp rollers. The super calender has fast speed and is used by a plurality of supercalenders. The paper-feeding device is also provided with auxiliary devices such as a paper-ejecting frame, a paper winding machine, a special lifting operation platform and the like. It is widely used for finishing of writing paper, offset printing paper, coated paper, capacitor paper, and the like.
The controller 11 is a logic circuit set having independent computing capability, includes a logic integrated circuit such as a CPU (central processing Unit), and has computing and controlling capabilities.
In other embodiments of the present invention, the controller 11 further comprises a human-machine interface for providing human-machine interaction, for providing data display and control command input.
Further, the system 1 comprises a headbox 13 for providing the pulp required for the formation of base paper. The headbox 13 is provided with different headbox nozzles 131 for different stations 14. The headbox 13 is connected to a controller 11, and the controller 11 is used to control the amount of the stock flow of the different head nozzles 131 to control the fiber content of the stock corresponding to the different stations 14, as shown in fig. 8.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method for use in paper tensioning, the method comprising:
detecting a first hardness value of the surface of the first web sample;
judging whether the first hardness value is within a hardness threshold range, if not, adjusting the overpressure value of a station corresponding to the first paper roll sample to adjust the paper tension of a subsequent paper roll;
the method further comprises:
detecting the first hardness values respectively corresponding to a plurality of first detection positions on the surface of the first paper roll sample;
respectively judging whether the first hardness value corresponding to each first detection position is within the hardness threshold range, wherein the first detection position corresponding to the first hardness value which is not within the hardness threshold range is a first defect position;
adjusting the overpressure value of the station corresponding to the first defect position to adjust the paper tension of the subsequent paper roll;
the step of adjusting the overpressure pressure value of the station corresponding to the first defect position specifically includes:
determining a target position of the first defect position on the surface of the first paper roll sample in a first base paper roll;
adjusting the overpressure pressure value corresponding to the station where the target position is located to adjust the thickness of paper passing through the corresponding area in the second original paper roll of the station where the target position is located subsequently, so as to adjust the hardness value of the surface of the second original paper roll;
wherein the first web sample is taken from the first base web;
the step of adjusting the overpressure pressure value of the station corresponding to the first defect position comprises the following steps:
determining a second detection position on the surface of the second original paper roll, and detecting a second hardness value corresponding to the second detection position; wherein the relative position of the second detection position in the second reel of base paper corresponds to the phase position of the first defect position in the first reel of base paper;
judging whether the second hardness value is within the hardness threshold range, wherein the second detection position corresponding to the second hardness value which is not within the hardness threshold range is a second defect position;
and adjusting the fiber content of the sizing agent of the station corresponding to the second defect position so as to adjust the paper tension of the subsequent paper roll.
2. The method according to claim 1, wherein the step of adjusting the pulp fiber content of the station corresponding to the second defect position comprises:
and adjusting the flow rate of the pulp source corresponding to the station where the second defect position is located to adjust the pulp fiber content of the base paper subsequently formed by the station where the second defect position is located, so as to adjust the hardness value of the surface of the base paper subsequently formed by the station where the second defect position is located.
3. The method according to claim 1, wherein said step of detecting said first hardness value corresponding to each of a plurality of first detection locations on said first web sample surface comprises:
and respectively applying mechanical force to the plurality of first detection positions on the surface of the first paper roll sample, and counting characteristic information fed back by each first detection position on the surface of the first paper roll sample to obtain a hardness distribution curve, wherein the hardness distribution curve comprises the first hardness value corresponding to each first detection position on the surface of the first paper roll sample.
4. The method according to claim 3, wherein the step of respectively determining whether the first hardness value corresponding to each of the first detection positions is within the hardness threshold range specifically comprises:
and obtaining the first hardness values corresponding to the first detection positions on the surface of the first paper roll sample from the hardness distribution curve, and comparing the first hardness values with the hardness threshold range respectively.
5. A system for the adjustment of the tension of paper, characterized in that it is able to implement a method for the adjustment of the tension of paper according to any one of claims 1 to 4.
6. The system according to claim 5, characterized in that the system comprises a controller and an overpressure device, wherein the controller is connected with the overpressure device and is used for controlling the overpressure device to adjust overpressure pressures corresponding to different stations.
7. The system of claim 6, further comprising a headbox, wherein the headbox is provided with different headbox nozzles corresponding to different stations, and the headbox is connected to the controller, and the controller is configured to control the flow rate of the different headbox nozzles to control the fiber content of the stock corresponding to the different stations.
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| DE4442746C1 (en) * | 1994-12-01 | 1996-05-02 | Voith Sulzer Finishing Gmbh | Method and device for treating a material web |
| US7799171B2 (en) * | 2004-07-01 | 2010-09-21 | Metso Paper, Inc. | Reeling method and system as well as an measuring apparatus |
| US20060254367A1 (en) * | 2005-05-12 | 2006-11-16 | Abb Ltd. | Measurement system for improved paper roll runnability |
| US9388530B2 (en) * | 2008-10-07 | 2016-07-12 | Nalco Company | Method and apparatus for monitoring and controlling the application of performance enhancing materials to creping cylindersto improve process |
| CN101725073B (en) * | 2009-11-24 | 2012-01-25 | 保定钞票纸业有限公司 | Paper eliminating processing method and device |
| US8728276B2 (en) * | 2010-05-20 | 2014-05-20 | Honeywell International Inc. | Apparatus and method for controlling curling potential of paper, paperboard, or other product during manufacture |
| CN103243605B (en) * | 2013-04-29 | 2015-11-25 | 金红叶纸业集团有限公司 | Stablize method and the paper making technique of paper making quality |
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