CN110670409A - Coating machine control method and coating machine - Google Patents
Coating machine control method and coating machine Download PDFInfo
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- CN110670409A CN110670409A CN201910785682.4A CN201910785682A CN110670409A CN 110670409 A CN110670409 A CN 110670409A CN 201910785682 A CN201910785682 A CN 201910785682A CN 110670409 A CN110670409 A CN 110670409A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 225
- 238000000576 coating method Methods 0.000 title claims abstract description 225
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000000758 substrate Substances 0.000 claims abstract description 112
- 238000004513 sizing Methods 0.000 claims abstract description 32
- 239000003292 glue Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 23
- 238000007781 pre-processing Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 230000001788 irregular Effects 0.000 description 8
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
Abstract
The application relates to the technical field of papermaking, and particularly discloses a control method of a coating machine, wherein the coating machine comprises: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device; the method comprises the following steps: controlling a camera to obtain a paper state image of the paper substrate before a sizing device performs sizing on the paper substrate; analyzing the paper state image through a PLC (programmable logic controller) to obtain paper state parameters; and controlling the working state of the first coating device according to the paper state parameters through a PLC (programmable logic controller). Through the mode, the paper breaking times of the coating machine can be effectively reduced.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to a coating machine control method and a coating machine.
Background
In the field of papermaking technology, coaters are the basic equipment of every paper machine and are an important guarantee for controlling the surface of paper. In the prior art, in order to wind up a paper product in production, a main arm of a coating machine is generally required to apply a large pressure to a paper seed, and the pressure applied to the paper seed by the preset main arm cannot be changed freely in the original program of the coating machine.
During long-term research and development, the inventor of the present application found that the existing all-in-one machine for coating paper machine (i.e. installing a coating device at the rear section of the paper machine, directly passing through the coating device after the paper substrate comes out, and then rolling the paper substrate) has obvious disadvantages: the broken holes of the paper substrate can not be repaired, and the broken holes are scraped at the coating scraper to cause paper breakage.
Disclosure of Invention
The application provides a coating machine control method and a coating machine, which can effectively reduce the paper breaking times of the coating machine.
In one aspect, the present application provides a coater control method, the coater including: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device; the method comprises the following steps: controlling a camera to obtain a paper state image of the paper substrate before a sizing device performs sizing on the paper substrate; analyzing the paper state image through a PLC (programmable logic controller) to obtain paper state parameters; and controlling the working state of the first coating device according to the paper state parameters through a PLC (programmable logic controller).
Wherein, the step of analyzing the paper state image through the PLC controller to obtain the paper state parameters comprises: loading a paper image, and preprocessing the paper image; determining a broken hole in the paper image by using the function; and recording the area of the broken hole and the position information of the broken hole.
Wherein, the step of controlling the operating condition of the first coating device according to the paper state parameters through the PLC controller comprises: judging whether the area of the broken hole is larger than or equal to the first preset broken hole area or not; if so, controlling the scraper of the first coating device to move to a first preset position within a first preset time so that the scraper of the first coating device is not in contact with the broken hole of the paper base when the broken hole of the paper base reaches the first coating device; the first predetermined time is less than or equal to the time the paper substrate moves from the on-line detection system to the first coating device.
Wherein the area of the first preset hole is 20-40mm2。
Wherein, the coating machine still includes: the dryer is arranged at the downstream of the first coating device and is connected with the PLC; after the step of determining whether the area of the broken hole is greater than or equal to the first preset broken hole area, the method further comprises: if so, controlling the dryer to start within a second preset time so that the dryer dries the paper substrate; the second preset time is less than or equal to the time for moving the broken hole of the paper substrate from the online detection system to the dryer.
Wherein, the coating machine also includes the second coating unit, and the second coating unit sets up between glue applying device and first coating unit, and the PLC controller still is connected with the second coating unit, and when first preset time is less than or equal to the time that the paper base member removed the second coating unit from on-line measuring system, the method still includes: judging whether the area of the broken hole is larger than or equal to a second preset broken hole area or not, wherein the second preset broken hole area is larger than the first preset broken hole area; if so, controlling the scraper of the second coating device to move to a second preset position within a third preset time, so that the scraper of the second coating device is not in contact with the broken hole of the paper base when the broken hole of the paper base reaches the second coating device; the third predetermined time is less than or equal to the time the paper substrate moves from the on-line detection system to the second coating device.
Wherein the second preset hole area is more than 40mm2。
In another aspect, the present application provides a coater including: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device; the camera is used for acquiring a paper state image of the paper substrate before the sizing device performs sizing on the paper substrate; the PLC is used for analyzing the paper state image to obtain paper state parameters, and the PLC is used for controlling the working state of the first coating device according to the paper state parameters.
The PLC is used for controlling the scraper of the first coating device to move to a first preset position within first preset time when judging that the area of the broken hole in the paper base body is larger than or equal to the area of the first preset broken hole, so that the scraper of the first coating device is not in contact with the broken hole of the paper base body when the broken hole of the paper base body reaches the first coating device, wherein the first preset time is smaller than or equal to the time when the paper base body moves to the first coating device from the online detection system.
Wherein, the coating machine still includes: the second coating device is arranged between the sizing device and the first coating device, the dryer is arranged at the downstream of the first coating device, and the PLC is also connected with the second coating device and the dryer; the PLC is also used for controlling the dryer to start within a second preset time when judging that the area of the broken hole in the paper base body is larger than or equal to the first preset broken hole area, so that the dryer dries the paper base body, wherein the second preset time is smaller than or equal to the time when the broken hole of the paper base body moves from the online detection system to the dryer; the PLC is also used for controlling the scraper of the second coating device to move to a second preset position within third preset time when judging that the area of the broken hole is larger than or equal to the second preset broken hole area, so that the scraper of the second coating device is not in contact with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the second coating device, wherein the second preset broken hole area is larger than the first preset broken hole area, and the third preset time is smaller than or equal to the time for the paper substrate to move to the second coating device from the online detection system.
The beneficial effect of this application is: in contrast to the state of the art, the present application provides a coater control method, a coater including: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device; the method comprises the following steps: controlling a camera to obtain a paper state image of the paper substrate before a sizing device performs sizing on the paper substrate; analyzing the paper state image through a PLC (programmable logic controller) to obtain paper state parameters; and controlling the working state of the first coating device according to the paper state parameters through a PLC (programmable logic controller). By the mode, the paper state image of the paper substrate before glue application is detected by the online paper defect detection system, the paper state parameter is obtained by analyzing the paper state image, the working state of the first coating device is adjusted in real time according to the paper state parameter, the working state of the first coating device is further adapted to the paper state condition of the paper substrate, the paper breaking frequency of the coating machine is effectively reduced to 1-2 times per day, and the running efficiency is improved by 10-20%.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic flow chart illustrating a method for controlling a coater according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a first structure of a coater in an embodiment of the present application;
FIG. 3 is a schematic view of a second structure of a coater in an embodiment of the present application;
FIG. 4 is a schematic flow chart of step S20 in FIG. 1;
FIG. 5 is a schematic flow chart of step S30 in FIG. 1;
FIG. 6 is a schematic flow chart of a method for controlling a coater according to another embodiment of the present disclosure;
FIG. 7 is a schematic view of a coater in another embodiment of the present application;
FIG. 8 is a schematic view showing a structure of a coater in still another embodiment of the present application;
fig. 9 is a schematic flow chart of a coater control method according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 and 3, fig. 1 is a schematic flow chart of a control method of a coater in an embodiment of the present application, fig. 2 is a schematic view of a first structure of the coater in the embodiment of the present application, and fig. 3 is a schematic view of a second structure of the coater in the embodiment of the present application.
The coater 10 includes: on-line measuring system 11, glueing device 12 and the first coating unit 13 of installing in the frame in proper order, wherein, on-line measuring system 11 includes: the coating apparatus includes a camera 111 and a PLC controller 112, and the PLC controller 112 is connected to the camera 111 and the first coating device 13, respectively.
It should be noted that the coater 10 of the present embodiment is a paper machine coater, which can be used for producing both single-side coated paper and double-side coated paper, and the paper machine coater is provided with a sizing device 12 and at least one set of coating devices downstream of the paper machine, and the paper machine can sequentially comprise a headbox 14, a wire section 142, a press section 143, a drying section 144, and a calender 145, which are mounted on a machine frame. I.e. the sizing device 12 and at least one set of coating devices, are arranged downstream of the calender. The sizing device 12 may be a sizing roller for simultaneously sizing both sides of the paper substrate. The first coating device 13 is a knife coating device that performs knife coating on the paper substrate.
Where the coating machine 10 includes only one set of coating devices, which is the first coating device 13 in this embodiment, the first coating device 13 may be used to blade coat the upper web of the paper substrate to produce single-sided coated paper.
While the coater 10 may include two sets of coating devices (i.e., an upstream coating device 15 and a downstream coating device), the upstream coating device 15 may be used to blade coat the upper web of the paper substrate, and after drying, the paper substrate moves to a downstream coating device, which is the first coating device 13 in this embodiment, and the first coating device 13 may be used to blade coat the lower web of the paper substrate to produce double-sided coated paper. The upstream coating device 15 may also be operated, and the lower wire side of the paper substrate is blade coated only by the first coating device 13 to produce a single-sided coated paper pattern.
The method for controlling the coater 10 includes the steps of:
s10: the control camera 111 acquires a paper-state image of the paper substrate before the sizing device 12 performs sizing on the paper substrate.
The acquisition frequency of the camera 111 may be 50 frames/second. In other embodiments, the acquisition frequency of the camera 111 may be 100 frames/second, 200 frames/second, 300 frames/second, or 400 frames/second. The camera 111 may set an exposure time, and based on the set exposure time, photograph a paper-state image of the paper substrate before the sizing device 12 performs sizing on the paper substrate. The cameras 111 may be dual cameras 111, single cameras 111, or multiple cameras 111, which is not limited herein.
S20: the paper image is analyzed by the PLC controller 112 to obtain paper parameters.
The PLC controller 112 may perform binarization processing on the paper-state image acquired by the camera 111, and analyze the parameter characteristics of the binarized paper-state image by using a neural network algorithm to obtain paper-state parameters.
Because the coating device is installed at the rear section of the paper machine, the paper base body directly passes through the sizing device 12 and the coating device after coming out, holes cannot be repaired on broken holes of the paper base body, and when the broken holes pass through the coating device, a scraper of the coating device directly contacts with the paper surface of the paper base body, so that the broken holes are enlarged to cause paper breakage. Therefore, the paper state parameter may be at least one of the shape, size, and positional relationship of the hole.
Alternatively, in the production process of coated paper, according to different product design requirements, the paper substrate does not need to be coated in a full width, only part of the predetermined coating area of the paper substrate needs to be coated, and the non-predetermined coating area of the paper substrate does not need to be coated. Since the non-intended coated area of the paper substrate is free of the coating material, the area of the blade corresponding to the non-intended coated area of the paper substrate will dry rub against the paper substrate (dry rub refers to the friction occurring between the blade and the uncoated paper substrate), resulting in a hole being broken in the non-intended coated area of the paper substrate. Therefore, the paper state parameter may be at least one of the size and the positional relationship of the non-predetermined coating region.
S30: the operating state of the first coating device 13 is controlled by the PLC controller 112 according to the paper state parameters.
Specifically, the PLC controller 112 may control the coating machine 10 to perform three production modes, including a single-sided coated paper mode, a double-sided coated paper mode, and a safety mode.
Where the coating machine 10 includes only one set of coating devices, the PLC controller 112 may control the coating machine 10 to perform a single-sided coated paper mode so that the first coating device 13 performs blade coating on the upper web of the paper substrate.
When the coater 10 includes the upstream coating device 15 and the downstream coating device, the PLC controller 112 may control the coater 10 to perform a double-sided coated paper mode, such that the upstream coating device 15 may be used to blade coat the upper web of the paper substrate, and the first coating device 13 may blade coat the lower web of the paper substrate; or the coater 10 is controlled to perform a single-sided coated paper mode, and the lower wire side of the paper substrate is blade-coated only by the first coating device 13.
When the PLC controller 112 determines that the paper state parameter is not ideal, for example, when there is a situation that paper breakage is easily caused, such as a hole breaking, a large number of holes breaking, or a large area of the hole breaking, on the paper substrate, the PLC controller 112 may control the coating machine 10 to perform a safety production mode, that is, control the first coating device 13 to stop working, and at this time, the scraper of the first coating device 13 is lifted up to avoid the hole breaking on the paper substrate.
When the PLC controller 112 determines that the paper state parameters are not ideal, for example, when the paper substrate is broken due to dry friction possibly occurring in the non-predetermined coating area of the scraper and the paper substrate, the PLC controller 112 may control the coating machine 10 to perform a safety production mode, that is, control the moving position of the scraper of the first coating device 13 or control the first coating device 13 to stop working, at this time, the scraper of the first coating device 13 is lifted up to avoid the non-predetermined coating area of the paper substrate, thereby avoiding the paper substrate from being broken.
Unlike the case of the prior art, the present embodiment provides a method of controlling a coater 10, the coater 10 including: on-line measuring system 11, glueing device 12 and the first coating unit 13 of installing in the frame in proper order, wherein, on-line measuring system 11 includes: a camera 111 and a PLC controller 112, the PLC controller 112 being connected to the camera 111 and the first coating device 13, respectively; the method comprises the following steps: controlling the camera 111 to obtain a paper-state image of the paper substrate before the sizing device 12 performs sizing on the paper substrate; analyzing the paper state image through the PLC 112 to obtain paper state parameters; the operating state of the first coating device 13 is controlled by the PLC controller 112 according to the paper state parameters. By the mode, the paper state image of the paper substrate before glue application is detected by the online paper defect detection system 11, the paper state parameter is obtained by analyzing the paper state image, the working state of the first coating device 13 is adjusted in real time according to the paper state parameter, the working state of the first coating device 13 is further adapted to the paper state condition of the paper substrate, the paper breaking frequency of the coating machine 10 is effectively reduced to 1-2 times per day, and the running efficiency is improved by 10-20%.
Referring to fig. 4, fig. 4 is a schematic flowchart of step S20 in fig. 1, and in an embodiment, step S20 may include the following steps:
s21: and loading the paper-state image and preprocessing the paper-state image.
Specifically, the loaded paper-state image is the paper-state image acquired in step S10. The preprocessing of the paper-state image includes white balancing the paper-state image, and adjusting the contrast and brightness of the paper-state image. In the embodiment, the gray-scale world automatic white balance algorithm is adopted to perform white balance on the paper-state image, the paper-state image in the lens is subjected to white balance before the paper-state body is shot, and different compensation modes are set according to the color temperature of light during shooting, so that the paper-state image is ensured to have no color cast.
S22: the function is used to determine a hole break in the paper image.
Specifically, S22 includes the steps of:
the method comprises the following steps: inputting the preprocessed paper image in a computer, and acquiring all edge points of the paper image by using a canny edge detection algorithm;
step two: classifying all edge points, respectively calculating the difference between the current edge point and the nearest two similar edge points of the current edge point in the vertical direction of the direction, determining the similar edge points with smaller absolute value of the difference, wherein the similar edge points belong to an initial edge line of an image contour, acquiring all initial edge lines of a paper image, distributing a reference direction for each edge point, extracting a feature vector of each edge point, and normalizing each feature vector;
step three: calculating a local self-similarity value and an overall self-similarity value of each edge point on each initial edge line according to the feature vector after normalization processing of each edge point, and taking a weighted combination of the local self-similarity value and the overall self-similarity value as a final self-similarity value of the edge point;
step four: setting a high threshold value, acquiring a set of edge points with the self-similarity value higher than the high threshold value on each initial edge line, and removing the edge points with the self-similarity value lower than the high threshold value on each initial edge line;
step five: calculating the self-similarity value of each edge point in the set and the nearest edge point, setting a low threshold value, acquiring all edge points with the self-similarity values higher than the low threshold value in the set, and marking the edge points lower than the low threshold value in the set as irregular edge points forming irregular images;
step six: classifying the edge points higher than the low threshold in the step five, forming a corrected edge line of an image outline by the same type of edge points, setting a length threshold for all the corrected edge lines, acquiring the corrected edge lines smaller than the threshold, and marking the points on the corrected edge lines as irregular edge points forming irregular images;
and seventhly, counting direction distribution histograms of the irregular edge points in the fifth step and the sixth step, determining the main direction of each irregular edge point, presetting a downward direction threshold range, removing all the irregular edge points with the main directions not within the direction threshold range, and marking the irregular edge points with the main directions within the direction threshold range as hole breaking images.
S23: and recording the area of the broken hole and the position information of the broken hole.
Through the mode, the interference image which is not matched with the characteristic region in the image identification can be eliminated, the accuracy of image contrast identification is improved, and the misjudgment rate is reduced.
Referring to fig. 5, fig. 5 is a schematic flowchart of step S30 in fig. 1, and further, step S30 includes the following steps:
s31: and judging whether the area of the broken hole is larger than or equal to the first preset broken hole area.
If yes, the process proceeds to S32.
S32: and controlling the scraper of the first coating device 13 to move to a first preset position within a first preset time, so that the scraper of the first coating device 13 is not contacted with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the first coating device 13.
Wherein the first preset time is less than or equal to the time for the paper substrate to move from the on-line detection system 11 to the first coating device 13.
Specifically, the first preset perforated area may be determined according to a situation that a paper break is caused after a scraper of the first coating device 13 rubs against a perforated hole of the paper substrate in an actual operation process. If the first preset broken hole area is set to be too large, broken holes with broken hole areas smaller than the first preset broken hole area are caused to break at the first coating device 13; if the first predetermined hole area is set to be too small, the number of unnecessary lifting of the blade of the first coating device 13 increases, which affects the quality.
After the first coating device 13 receives the moving instruction, the time required for the scraper of the first coating device 13 to move to the first preset position is less than or equal to the time for the paper substrate to move from the online detection system 11 to the first coating device 13, so that when the broken hole of the paper substrate reaches the first coating device 13, the scraper of the first coating device 13 is lifted, and the scraper of the first coating device 13 is not in contact with the broken hole of the paper substrate.
The area of the first preset hole can be 20-40mm2E.g. 20mm2、30mm2Or 40mm2。
Referring to fig. 6 and 7, fig. 6 is a schematic flow chart of a control method of the coater 10 according to another embodiment of the present disclosure, and fig. 7 is a schematic structural diagram of the coater 10 according to another embodiment of the present disclosure. Further, the coater 10 further includes: a dryer 16, the dryer 16 being disposed downstream of the first coating device 13, the dryer 16 being connected to a PLC controller 112.
Specifically, the dryer 16 may be an infrared dryer 16 and an air-float dryer 16, and the infrared dryer 16 is the dryer 16 heated by means of an electric infrared radiator or an induction heating device. The air-float dryer 16 may be a dryer 16 that performs drying by means of a hot air blower, a cold air blower.
After step S31, the method further includes the steps of:
if the area of the broken hole is greater than or equal to the first predetermined area, the process proceeds to step S34.
S34: the dryer 16 is controlled to start for a second preset time to allow the dryer 16 to dry the paper substrate.
Wherein the second predetermined time is less than or equal to the time for moving the broken hole of the paper substrate from the on-line detection system 11 to the dryer 16.
Further, the paper substrate coated in the first coating device 13 is dried, and the infrared dryer 16 and the air-float dryer 16 may be used as the dryer 16. Since the dryer 16 is disposed downstream of the first coating device 13 and the distance between the two is small, after the first coating device 13 receives the moving instruction, the dryer 16 can receive the starting instruction to dry the coated paper substrate while the blade of the first coating device 13 moves to the first preset position.
In this manner, the dryer 16 is not activated in time resulting in too high a moisture content in the paper substrate, which can easily lead to paper breaks.
Further, the coater 10 further includes a second coating device 15, the second coating device 15 is disposed between the sizing device 12 and the first coating device 13, and the PLC controller 112 is further connected to the second coating device 15.
Specifically, the second coating device 15 corresponds to the upstream coating device 15 for blade coating the upper web of the paper substrate; while the first coating device 13 corresponds to a downstream coating device for blade coating the lower web side of the paper substrate.
Referring to fig. 8 and 9, fig. 9 is a schematic structural diagram of a coater 10 according to another embodiment of the present disclosure, and fig. 8 is a schematic flow chart of a control method of the coater 10 according to another embodiment of the present disclosure. Wherein, when the first preset time is less than or equal to the time for moving the paper substrate from the on-line detection system 11 to the second coating device 15, the method further comprises the following steps:
s40: and judging whether the area of the broken hole is larger than or equal to the second preset broken hole area.
And the second preset hole area is larger than the first preset hole area.
If yes, the process proceeds to step S50.
S50: and controlling the scraper of the second coating device 15 to move to the second preset position within the third preset time, so that the scraper of the second coating device 15 is not contacted with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the second coating device 15.
Wherein the third predetermined time is less than or equal to the time the paper substrate moves from the in-line inspection system 11 to the second coating device 15.
S32: and controlling the scraper of the first coating device 13 to move to a first preset position within a first preset time, so that the scraper of the first coating device 13 is not contacted with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the first coating device 13.
Specifically, the inventors of the present application found that, when the second coating device 15 performs coating, the occurrence of paper breakage at the holes of the paper substrate accounts for 10 to 20% of the total number of paper breakings; when the first coating device 13 performs coating, the occurrence of paper breakage at the broken holes of the paper substrate accounts for 60 to 70% of the total number of paper breakings. Therefore, it is necessary to control the blade of the second coating device 15 to move to the second preset position to avoid the broke of the paper substrate.
The second preset area of the broken hole can be determined according to the situation of paper breakage caused by friction between the scraper of the second coating device 15 and the broken hole of the paper substrate in the actual operation process. If the second preset broken hole area is set to be too large, broken holes with broken hole areas smaller than the second preset broken hole area are caused to break at the second coating device 15; if the second predetermined perforation area is set to be too small, the number of unnecessary lifting of the blade of the second coating device 15 increases, which affects the quality.
After the second coating device 15 receives the moving instruction, the time required for the scraper of the second coating device 15 to move to the second preset position is less than or equal to the time for the paper substrate to move from the online detection system 11 to the second coating device 15, so that when the broken hole of the paper substrate reaches the second coating device 15, the scraper of the second coating device 15 is lifted, and the scraper of the second coating device 15 is not in contact with the broken hole of the paper substrate.
The second preset broken hole area is more than 40mm2E.g. 42mm2、50mm2Or 60mm2。
The present application provides a coater 10, the coater 10 including: on-line measuring system 11, glueing device 12 and the first coating unit 13 of installing in the frame in proper order, wherein, on-line measuring system 11 includes: the coating apparatus includes a camera 111 and a PLC controller 112, and the PLC controller 112 is connected to the camera 111 and the first coating device 13, respectively.
The camera 111 is used to obtain a paper-state image of the paper substrate before the sizing device 12 applies the size to the paper substrate.
The PLC controller 112 is configured to analyze the paper-state image to obtain a paper-state parameter, and control the working state of the first coating device 13 according to the paper-state parameter through the PLC controller 112.
It should be noted that the coating machine 10 of the present embodiment can perform the steps of the above method, and the detailed description of the related contents refers to the above method section, which is not repeated herein.
The coater 10 includes: on-line measuring system 11, glueing device 12 and the first coating unit 13 of installing in the frame in proper order, wherein, on-line measuring system 11 includes: a camera 111 and a PLC controller 112, the PLC controller 112 being connected to the camera 111 and the first coating device 13, respectively; the method comprises the following steps: controlling the camera 111 to obtain a paper-state image of the paper substrate before the sizing device 12 performs sizing on the paper substrate; analyzing the paper state image through the PLC 112 to obtain paper state parameters; the operating state of the first coating device 13 is controlled by the PLC controller 112 according to the paper state parameters. By the mode, the paper state image of the paper substrate before glue application is detected by the online paper defect detection system 11, the paper state parameter is obtained by analyzing the paper state image, the working state of the first coating device 13 is adjusted in real time according to the paper state parameter, the working state of the first coating device 13 is further adapted to the paper state condition of the paper substrate, the paper breaking frequency of the coating machine 10 is effectively reduced to 1-2 times per day, and the running efficiency is improved by 10-20%.
In an embodiment, the coating machine 10 further includes: a second coating device 15 and a dryer 16, the second coating device 15 being disposed between the sizing device 12 and the first coating device 13, the dryer 16 being disposed downstream of the first coating device 13, the PLC controller 112 further being connected to the second coating device 15 and the dryer 16.
The PLC controller 112 is configured to control the scraper of the first coating device 13 to move to a first preset position within a first preset time when it is determined that the area of the broken hole in the paper substrate is greater than or equal to a first preset broken hole area, so that the scraper of the first coating device 13 does not contact the broken hole of the paper substrate when the broken hole of the paper substrate reaches the first coating device 13, where the first preset time is less than or equal to the time when the paper substrate moves from the online detection system 11 to the first coating device 13.
The PLC controller 112 is further configured to control the dryer 16 to start within a second preset time when it is determined that the area of the broken hole in the paper substrate is greater than or equal to the first preset area of the broken hole, so that the dryer 16 dries the paper substrate, where the second preset time is less than or equal to the time when the broken hole in the paper substrate moves from the online detection system 11 to the dryer 16.
The PLC controller 112 is further configured to control the scraper of the second coating device 15 to move to a second preset position within a third preset time when it is determined that the area of the broken hole is greater than or equal to a second preset broken hole area, so that the scraper of the second coating device 15 does not contact the broken hole of the paper substrate when the broken hole of the paper substrate reaches the second coating device 15, where the second preset broken hole area is greater than the first preset broken hole area, and the third preset time is less than or equal to the time when the paper substrate moves from the online detection system 11 to the second coating device 15.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A coater control method, characterized in that the coater comprises: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device;
the method comprises the following steps:
controlling the camera to acquire a paper-state image of the paper substrate before the sizing device performs sizing on the paper substrate;
analyzing the paper state image through the PLC to obtain paper state parameters;
and controlling the working state of the first coating device according to the paper state parameters through the PLC.
2. The method of claim 1, wherein the step of analyzing the paper image by the PLC controller to obtain paper parameters comprises:
loading the paper image and preprocessing the paper image;
determining a broken hole in the paper image by using a function;
and recording the area of the broken hole and the position information of the broken hole.
3. The method of claim 2, wherein the step of controlling the working state of the first coating device according to the paper state parameter by the PLC controller comprises:
judging whether the area of the broken hole is larger than or equal to a first preset broken hole area;
if so, controlling the scraper of the first coating device to move to a first preset position within a first preset time so that the scraper of the first coating device is not in contact with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the first coating device;
the first preset time is less than or equal to the time for the paper substrate to move from the online detection system to the first coating device.
4. The method of claim 3, wherein the first predetermined perforation area is 20-40mm2。
5. The method of claim 3, wherein the coater further comprises: a dryer disposed downstream of the first coating device, the dryer being connected to the PLC controller;
after the step of determining whether the area of the broken hole is greater than or equal to a first preset broken hole area, the method further includes:
if so, controlling the dryer to start within a second preset time so that the dryer dries the paper substrate;
the second preset time is less than or equal to the time for moving the broken hole of the paper substrate from the online detection system to the dryer.
6. The method of claim 3, wherein the coater further comprises a second coating device disposed between the sizing device and the first coating device, the PLC controller further connected to the second coating device, and wherein when the first predetermined time is less than or equal to a time when the paper substrate moves from the in-line inspection system to the second coating device, the method further comprises:
judging whether the area of the broken hole is larger than or equal to a second preset broken hole area or not, wherein the second preset broken hole area is larger than the first preset broken hole area;
if so, controlling the scraper of the second coating device to move to a second preset position within a third preset time, so that the scraper of the second coating device is not in contact with the broken hole of the paper substrate when the broken hole of the paper substrate reaches the second coating device;
the third preset time is less than or equal to the time for the paper substrate to move from the online detection system to the second coating device.
7. The method of claim 6, wherein the second predetermined perforation area is greater than 40mm2。
8. A coater, comprising: install online detecting system, glue applying device and the first coating unit in the frame in proper order, wherein, online detecting system includes: the PLC is respectively connected with the camera and the first coating device;
the camera is used for acquiring a paper-state image of the paper substrate before the sizing device performs sizing on the paper substrate;
the PLC is used for analyzing the paper state image to obtain paper state parameters, and the PLC is used for controlling the working state of the first coating device according to the paper state parameters.
9. A coater according to claim 8,
the PLC controller is used for: when the area of the broken hole in the paper base body is judged to be larger than or equal to a first preset broken hole area, controlling a scraper of the first coating device to move to a first preset position within a first preset time, so that when the broken hole of the paper base body reaches the first coating device, the scraper of the first coating device is not in contact with the broken hole of the paper base body, wherein the first preset time is smaller than or equal to the time for moving the paper base body from the online detection system to the first coating device.
10. The coater according to claim 9,
the coating machine further includes: the second coating device is arranged between the sizing device and the first coating device, the dryer is arranged at the downstream of the first coating device, and the PLC is also connected with the second coating device and the dryer;
the PLC controller is further configured to: when the area of the broken holes in the paper substrate is judged to be larger than or equal to the first preset broken hole area, controlling the dryer to start within second preset time so that the dryer dries the paper substrate, wherein the second preset time is smaller than or equal to the time for moving the broken holes of the paper substrate from the online detection system to the dryer;
the PLC controller is further configured to: when the area of the broken hole is judged to be larger than or equal to the second preset broken hole area, the scraper of the second coating device is controlled to move to the second preset position within third preset time, so that when the broken hole of the paper base body reaches the second coating device, the scraper of the second coating device is not in contact with the broken hole of the paper base body, wherein the second preset broken hole area is larger than the first preset broken hole area, and the third preset time is smaller than or equal to the time for the paper base body to move from the online detection system to the second coating device.
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Denomination of invention: A coating machine control method and coating machine Effective date of registration: 20231101 Granted publication date: 20220315 Pledgee: Bank of China Limited by Share Ltd. Zhenjiang Dagang sub branch Pledgor: Goldeast Paper (Jiangsu) Co.,Ltd. Registration number: Y2023980063170 |