阅读说明：本技术 一种光学硬化膜试产线用缺陷检测系统 (Defect detection system for optical hardening film trial production line ) 是由 樊燕 张永汉 董红星 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种光学硬化膜试产线用缺陷检测系统,包括卷绕有透明基材的放卷单元、第一输送单元、用于将硬化涂液涂布到所述的透明基材下表面上的涂布单元、第二输送单元、用于将所述的透明基材上的硬化涂液固化形成透明硬化层的固化单元、收卷单元、警报单元和控制单元,所述的放卷单元与所述的第一输送单元之间沿输送方向依次设置有第一光学检测设备和第一打标装置,所述的固化单元与所述的收卷单元之间沿输送方向依次设置有第二光学检测设备、第二打标装置和第三光学检测设备；优点是能够确认记录的缺陷是透明基材的缺陷、透明硬化层的缺陷或两者的叠加,为后续光学硬化膜生产工艺改进提供直接依据。(The invention discloses a defect detection system for an optical hardening film trial production line, which comprises an unreeling unit, a first conveying unit, a coating unit, a second conveying unit, a curing unit, a reeling unit, an alarming unit and a control unit, wherein the unreeling unit is coiled with a transparent base material, the coating unit is used for coating hardening coating liquid on the lower surface of the transparent base material, the curing unit is used for curing the hardening coating liquid on the transparent base material to form a transparent hardened layer, a first optical detection device and a first marking device are sequentially arranged between the unreeling unit and the first conveying unit along the conveying direction, and a second optical detection device, a second marking device and a third optical detection device are sequentially arranged between the curing unit and the reeling unit along the conveying direction; the method has the advantages that the recorded defects can be confirmed to be defects of the transparent substrate, defects of the transparent hardened layer or superposition of the defects and the transparent hardened layer, and direct basis is provided for improvement of a subsequent optical hardened film production process.)

1. A defect detection system for an optical hardening film trial production line comprises an unreeling unit, a first conveying unit, a coating unit, a second conveying unit, a curing unit, a reeling unit, an alarm unit and a control unit, wherein the unreeling unit is coiled with a transparent base material, the coating unit is used for coating hardening coating liquid on the lower surface of the transparent base material, the curing unit is used for curing the hardening coating liquid on the transparent base material to form a transparent hardening layer, the transparent base material is sequentially passed through the first conveying unit, the coating unit, the second conveying unit and the curing unit to obtain an optical hardening film, the optical hardening film is coiled on the reeling unit, the defect detection system is characterized in that a first optical detection device and a first marking device are sequentially arranged between the unreeling unit and the first conveying unit along the conveying direction, the first optical detection device is used for detecting defects on the transparent base material, marking the defects detected by the first optical detection device as first defects, wherein the first marking device makes first marks on the upper surface of the transparent substrate according to the positions of the first defects, the first marks comprise first cross marks corresponding to the most serious positions of the first defects and first graphic marks surrounding the first defects, and the shapes of the first graphic marks correspond to the types of the first defects;

the curing unit and the winding unit are sequentially provided with second optical detection equipment, a second marking device and third optical detection equipment along the conveying direction, the second optical detection equipment is used for detecting defects on the optical hardening film, the defects detected by the second optical detection equipment are marked as second defects, the second marking device makes second marks on the upper surface of the transparent base material according to the positions of the second defects, the second marks comprise second cross marks corresponding to the most serious positions of the second defects and second graphic marks surrounding the second defects, the shapes of the second graphic marks correspond to the types of the second defects, and the third optical detection equipment is used for identifying the first cross marks, the first graphic marks, The second cross mark and the second graph mark and send the recognized image data to the control unit;

the control unit is used for controlling the first optical detection device, the first marking device, the first conveying unit, the coating unit, the second conveying unit, the curing unit, the second optical detection device, the second marking device, the third optical detection device, the winding unit and the alarm unit to work cooperatively, and making the following judgment according to image data sent by the third optical detection device:

a. if the second cross mark is not in the range of the Lcm with the first cross mark at a certain position as the center, the first defect at the position can be completely covered by the transparent hardened layer;

b. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are the same as the shape of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer;

c. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are respectively different from the shape of the first graphic mark at the position, the first defect at the position can be completely covered by the transparent hardened layer, but a new defect is introduced in the coating process;

d. if 2-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, the shape of the second graphic mark corresponding to part of the second cross mark in the Lcm range at the position is the same as that of the first graphic mark at the position, and the shape of the second graphic mark corresponding to the other part of the second cross mark in the Lcm range at the position is different from that of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer, and a new defect is introduced in the coating process;

e. if n +1 or more second cross marks or at least one first cross mark exists in the Lcm range taking the first cross mark at a certain position as the center, the control unit controls the first optical detection device, the first marking device, the first conveying unit, the coating unit, the second conveying unit, the curing unit, the second optical detection device, the second marking device, the third optical detection device and the winding unit to stop running, and controls the alarm unit to give an alarm;

f. if the first cross mark is not in the range of the Lcm with the second cross mark at a certain position as the center, indicating that the position is in the coating process and introducing a new defect;

wherein L is more than or equal to 0.2 and less than or equal to 1.5, n is more than or equal to 5 and less than or equal to 10, and n is a natural number.

2. The system of claim 1, wherein the third optical inspection device is a color industrial camera, the first cross mark color is different from the second cross mark color, the first graphic mark color is different from the second graphic mark color, the shape of the first graphic mark is different from that of the second graphic mark, the position of the first graphic mark is partially overlapped or staggered with that of the second graphic mark, the third optical detection device is used for effectively identifying the color and the shape of the first cross mark, the color and the shape of the first graphic mark, the color and the shape of the second cross mark and the color and the shape of the second graphic mark and sending the identified image data to the control unit.

3. The system of claim 1, wherein the unwinding unit comprises a first roller, and the transparent substrate is wound around the first roller.

4. The system of claim 1, wherein the first optical inspection apparatus and the second optical inspection apparatus are AOI automatic optical inspection apparatuses.

5. The system of claim 1, wherein the first marking device comprises a first marking machine for marking a first cross mark and a second marking machine for marking a first graphic mark, and the first marking machine and the second marking machine both use high temperature resistant and/or UV resistant quick-drying ink; the second marking device comprises a third marking machine for marking a second cross mark and a fourth marking machine for marking a second graph mark, wherein the third marking machine and the fourth marking machine adopt quick-drying printing ink.

6. The system of claim 1, wherein the winding unit comprises a second roller and a rotating motor for driving the second roller to rotate, the optical hardening film is wound around the second roller, and the rotating motor is electrically connected to the control unit.

7. The defect detection system for the trial production line of the optical hardening film as claimed in claim 1, wherein a first storage unit is arranged between the unreeling unit and the first optical detection device, the first storage unit comprises a plurality of third roller shafts and a first linear driving mechanism, the third roller shafts are distributed in a vertically staggered manner, the transparent substrate passes through the third roller shafts in a serpentine material feeding manner, the first linear driving mechanism is electrically connected with the control unit, and the first linear driving mechanism is used for driving any one row of the third roller shafts to move up and down;

the second beat mark device with third optical detection equipment between be provided with second storage unit, second storage unit include many fourth roller and second sharp actuating mechanism, many the fourth roller crisscross distribution from top to bottom, the optics hardening membrane be snakelike form of walking about material and pass through many the fourth roller, second sharp actuating mechanism with the control unit electricity connect, second sharp actuating mechanism be used for driving arbitrary one row the fourth roller reciprocate.

8. The system of claim 1, wherein the alarm unit is an audible and visual alarm.

Technical Field

The invention belongs to the technical field of optical hardening film production, and particularly relates to a defect detection system for an optical hardening film trial production line.

Background

The optical hardening film generally includes a transparent substrate and a transparent hardening layer coated on the surface of the transparent substrate and formed by thermosetting and/or UV light curing. In the production process, the quality of the optical hardening film is seriously affected by defects such as defects of the transparent base material (such as pricks, scratches, holes and the like), contamination of the transparent hardening layer caused by the circulation of production raw materials or human factors (such as bubbles, agglomerated particles, mosquitoes and the like), scratches generated by mechanical collision in the preparation process of the optical hardening film and the like.

In order to optimize the mass production process, trial production needs to be carried out before formal mass production, incoming material inspection of the transparent base material and trial production process inspection of the optical hardening film need to be carried out manually before trial production, and reference basis is provided for optimization and process control of the subsequent production process according to inspection results. The incoming material inspection of the transparent base material is to manually detect the outer ring of the transparent base material coil stock, and judge whether the incoming material of the transparent base material is qualified or not only by taking the distribution condition of various defects on the outer ring as a basis, but if the outer ring of the transparent base material coil stock is qualified, the inner ring of the transparent base material coil stock has defects, and the defects on the inner ring are not found in time before coating, the quality of an optical hardening film can be seriously influenced, so that the hardening coating liquid is greatly wasted. In addition, partial defects on the transparent substrate can be covered by subsequently adjusting the thickness of the transparent hardened layer, taking the TAC substrate as an example, the TAC substrate is slightly scratched (the width is less than or equal to 0.05mm, the length is less than or equal to 1mm, the distance is more than or equal to 15mm, and the number of the defects is less than 3 strips/m²) Since the transparent base material can be covered by increasing the thickness of the original transparent hardened layer by 10% to 30%, if the inspection and judgment of the transparent base material is too severe, the defect rate of the transparent base material is too high, which results in a large consumption of raw materials.

In general, the trial production process of the optical hardening film is inspected by recording defects on the optical hardening film by manual observation or optical inspection equipment after the transparent hardened layer is formed. For example, the chinese patent publication No. CN111452514B discloses a whole line marking system and method for a polarizing film, which is a multilayer composite optical film. The whole polarizing film line marking system comprises an extension composite section marking device, a coating front section marking device and a coating rear section marking device, wherein a two-dimensional code ink-jet printer is required to regularly spray a two-dimensional code on the edge of a film of an extension composite section of a production line, a two-dimensional code coordinate system of the film is defined, and under the assistance of a subsequent automatic optical detection unit and a decoder, the marking machine marks the coated polarizing film according to coordinates of a first defect part, a second defect part and a third defect part relative to a third automatic optical detection coordinate system so as to mark the first defect part, the second defect part and the third defect part. If the marking system is used for marking the defects of the optical hardening film prepared in a coating mode, the dependence degree of the marking system on a two-dimensional code spraying machine is high, the distribution condition of various defects on the film needs to be converted into coordinates in a unified coordinate system through complex logic operation, then unified marking is carried out, and the two-dimensional code printed on the edge of the optical hardening film introduces new defects for the optical hardening film, so that the marking system can not visually express the defect parts of the optical hardening film on line, can not objectively judge the influence degree of the defects, can not confirm that the recorded defects are the defects of the transparent base material, the defects of the transparent hardening layer or the superposition of the defects and have a plurality of uncertain influence factors, and can not provide direct basis for the improvement of the subsequent optical hardening film production process.

Disclosure of Invention

The invention aims to provide a defect detection system for an optical hardening film production line, which can confirm whether the recorded defects are defects of a transparent substrate, defects of a transparent hardening layer or superposition of the defects and provide direct basis for improvement of a subsequent optical hardening film production process.

The technical scheme adopted by the invention for solving the technical problems is as follows: a defect detection system for an optical hardening film trial production line comprises an unreeling unit, a first conveying unit, a coating unit, a second conveying unit, a curing unit, a reeling unit, an alarm unit and a control unit, wherein the unreeling unit is coiled with a transparent base material, the coating unit is used for coating hardening coating liquid on the lower surface of the transparent base material, the curing unit is used for curing the hardening coating liquid on the transparent base material to form a transparent hardening layer, the optical hardening film is coiled on the reeling unit after the transparent base material sequentially passes through the first conveying unit, the coating unit, the second conveying unit and the curing unit, a first optical detection device and a first marking device are sequentially arranged between the unreeling unit and the first conveying unit along the conveying direction, and the first optical detection device is used for detecting defects on the transparent base material, marking the defects detected by the first optical detection device as first defects, wherein the first marking device makes first marks on the upper surface of the transparent substrate according to the positions of the first defects, the first marks comprise first cross marks corresponding to the most serious positions of the first defects and first graphic marks surrounding the first defects, and the shapes of the first graphic marks correspond to the types of the first defects;

the curing unit and the winding unit are sequentially provided with second optical detection equipment, a second marking device and third optical detection equipment along the conveying direction, the second optical detection equipment is used for detecting defects on the optical hardening film, the defects detected by the second optical detection equipment are marked as second defects, the second marking device makes second marks on the upper surface of the transparent base material according to the positions of the second defects, the second marks comprise second cross marks corresponding to the most serious positions of the second defects and second graphic marks surrounding the second defects, the shapes of the second graphic marks correspond to the types of the second defects, and the third optical detection equipment is used for identifying the first cross marks, the first graphic marks, The second cross mark and the second graph mark and send the recognized image data to the control unit;

the control unit is used for controlling the first optical detection device, the first marking device, the first conveying unit, the coating unit, the second conveying unit, the curing unit, the second optical detection device, the second marking device, the third optical detection device, the winding unit and the alarm unit to work cooperatively, and making the following judgment according to image data sent by the third optical detection device:

a. if the second cross mark is not in the range of the Lcm with the first cross mark at a certain position as the center, the first defect at the position can be completely covered by the transparent hardened layer;

b. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are the same as the shape of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer;

c. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are respectively different from the shape of the first graphic mark at the position, the first defect at the position can be completely covered by the transparent hardened layer, but a new defect is introduced in the coating process;

d. if 2-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, the shape of the second graphic mark corresponding to part of the second cross mark in the Lcm range at the position is the same as that of the first graphic mark at the position, and the shape of the second graphic mark corresponding to the other part of the second cross mark in the Lcm range at the position is different from that of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer, and a new defect is introduced in the coating process;

e. if n +1 or more second cross marks or at least one first cross mark exists in the Lcm range taking the first cross mark at a certain position as the center, the control unit controls the first optical detection device, the first marking device, the first conveying unit, the coating unit, the second conveying unit, the curing unit, the second optical detection device, the second marking device, the third optical detection device and the winding unit to stop running, and controls the alarm unit to give an alarm;

f. if the first cross mark is not in the range of the Lcm with the second cross mark at a certain position as the center, indicating that the position is in the coating process and introducing a new defect;

wherein L is more than or equal to 0.2 and less than or equal to 1.5, n is more than or equal to 5 and less than or equal to 10, and n is a natural number.

The third optical detection device is a color industrial camera, the color of the first cross mark is different from that of the second cross mark, said first graphical indicia being a different color than said second graphical indicia, said first graphical indicia being a different shape than said second graphical indicia, the position of the first graphic mark is partially overlapped or staggered with the position of the second graphic mark, the third optical detection device is used for effectively identifying the color and the shape of the first cross mark, the color and the shape of the first graphic mark, the color and the shape of the second cross mark and the color and the shape of the second graphic mark, and the identified image data is sent to the control unit, so that the subsequent control unit can accurately judge the distribution condition of various defects and the coverage degree of the defects on the transparent base material.

The unreeling unit comprises a first roll shaft, and the transparent base material is coiled on the first roll shaft.

The first optical detection device and the second optical detection device are AOI automatic optical detectors. In the structure, the AOI automatic optical detector acquires a picture of a defect through a CCD camera system, extracts main characteristic parameters of the defect after processing through algorithms of an image processing card, computer processing software and the like, compares the main characteristic parameters with parameters in a defect template defined in a control unit database, and confirms the type of the defect.

The first marking device comprises a first marking machine for marking a first cross mark and a second marking machine for marking a first graph mark, and the first marking machine and the second marking machine both adopt high temperature resistant and/or UV resistant quick-drying printing ink; the second marking device comprises a third marking machine for marking a second cross mark and a fourth marking machine for marking a second graph mark, wherein the third marking machine and the fourth marking machine adopt quick-drying printing ink. In this structure, the type of rapid-curing cutback printing ink is selected according to the solidification mode of solidification unit, if the thermosetting adopts high temperature resistant rapid-curing cutback printing ink, and the UV photocuring adopts anti UV rapid-curing cutback printing ink to guarantee that all signs on the transparent substrate can not receive follow-up solidification environmental impact, all signs are difficult for taking place the disappearance, are favorable to follow-up control unit to make accurate judgement.

The winding unit comprises a second roller shaft and a rotating motor used for driving the second roller shaft to rotate, the optical hardening film is wound on the second roller shaft, and the rotating motor is electrically connected with the control unit.

A first material storage unit is arranged between the unreeling unit and the first optical detection device and comprises a plurality of third roll shafts and a first linear driving mechanism, the third roll shafts are distributed in an up-and-down staggered manner, the transparent base material passes through the third roll shafts in a snake-shaped material conveying manner, the first linear driving mechanism is electrically connected with the control unit, and the first linear driving mechanism is used for driving any one row of the third roll shafts to move up and down;

the second beat mark device with third optical detection equipment between be provided with second storage unit, second storage unit include many fourth roller and second sharp actuating mechanism, many the fourth roller crisscross distribution from top to bottom, the optics hardening membrane be snakelike form of walking about material and pass through many the fourth roller, second sharp actuating mechanism with the control unit electricity connect, second sharp actuating mechanism be used for driving arbitrary one row the fourth roller reciprocate. In the structure, because the third optical detection unit needs to identify the colors and shapes of different randomly-appearing marks, so that the control unit can determine whether the defects of the transparent base material can be effectively covered, the method is used for analyzing and counting the distribution condition of new defects generated during the subsequent coating preparation of the transparent hardened layer, if the defect amount on the optical hardened film is excessive, the processing time is longer relatively, and in order to ensure normal production, through arranging the first storage unit and the second storage unit, the transparent base material forms the snake-shaped material feeding at the first storage unit, and through driving any one row of third roller shafts to move in the opposite direction relative to other third roller shafts by the first linear driving mechanism, the conveying line of the transparent base material can be relatively prolonged, so as to achieve the purpose of temporarily storing the transparent base material, and similarly, the optical hardened film forms the snake-shaped material feeding at the second storage unit, the second linear driving mechanism drives any row of fourth rollers to move in the opposite direction relative to other fourth roller shafts, so that the conveying line of the optical hardening film can be relatively extended, the purpose of temporarily storing the optical hardening film is achieved, and the normal operation of a test production line is ensured.

The alarm unit is a sound-light alarm.

Compared with the prior art, the invention has the advantages that:

1. detecting defects on the transparent substrate through first optical detection equipment, marking and recording through a first marking device, detecting defects on the optical hardening film through second optical detection equipment, marking and recording through a second marking device, identifying all identifiers through third optical detection equipment, sending the identified image data to a control unit, comparing all the identifiers through the control unit, directly obtaining the detected defects from the transparent substrate, the transparent hardening layer or the superposition of the transparent hardening layer and the transparent hardening layer according to a judging method, directly obtaining whether the defects on the transparent substrate can be covered by the transparent hardening layer, and providing a direct basis for the improvement of the subsequent optical hardening film production process;

2. the method is characterized in that a first cross mark is marked at the position with the most serious first defect, a first graphic mark corresponding to the first defect is marked on the principle of surrounding the first defect as much as possible, a second cross mark is marked at the position with the most serious second defect, and a second graphic mark corresponding to the second defect is marked on the principle of surrounding the second defect as much as possible, because the cross mark is easier to be obtained by a third optical detection device relative to marks with other shapes and is also easy to position the actual position of the defect, a control unit is convenient to judge the overlap ratio and the misalignment amount between the first graphic mark and the second graphic mark corresponding to the same type of defect according to the distance between the central points of different cross marks, so that the covering degree of the defect on a transparent base material by a transparent hardened layer is more accurately judged, and a direct criterion is provided for accurately controlling the thickness of the transparent hardened layer by a subsequent optical hardened film, in addition, parameters such as the types and the distribution conditions of all defects can be directly obtained by counting the number of the first graphic marks and the second graphic marks, so that reference is provided for the control of the subsequent optical hardening film production process;

3. the first mark and the second mark are both positioned on the other surface of the transparent substrate relative to the transparent hardened layer, the first mark cannot be soaked in the hardening coating liquid to cause pollution, the first mark and the second mark both adopt quick-drying ink, the optical hardened film cannot pollute the surface of the transparent hardened layer in the roll-to-roll continuous production process, the circle range of all marks is proper, unnecessary impurities cannot be brought into the optical hardened film, the clean production of the whole optical hardened film cannot be influenced in the mode of visually marking defects by the ink, and the subsequent optical hardened film can be conveniently cut to remove defects when being attached to specific commodities;

4. if more than n +1 second cross marks or at least one first cross mark exists in the Lcm range with the first cross mark as the center, the first defect on the transparent substrate and the second defect on the transparent hardened layer are relatively dense, the control unit controls the first optical detection device, the first marking device, the first conveying unit, the coating unit, the second conveying unit, the curing unit, the second optical detection device, the second marking device, the third optical detection device and the winding unit to stop running, an alarm is sent out through the alarm unit to remind workers, the severity of the first defect and the severity of the second defect in the range are judged by the workers according to the density of the marks on the optical hardened film surface, and the detection result is manually recorded. If the machine halt is caused by a large number of first defects, a raw material supplier is contacted to analyze the forming reasons of the defects of the transparent base material, and the raw material is returned; if the second defect is large in quantity to cause shutdown, measures such as adjusting production process parameters (for example, reducing the running speed of a roll shaft) and/or raw material proportion of the hardening coating liquid (for example, reducing the proportion of particles in raw materials) are required to find a source causing the defects from the trial production process of the optical hardening film, so that the subsequent mass production of the optical hardening film is protected.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention;

FIG. 2 is a control framework diagram of the present invention.

In the figure: 11. an unwinding unit; 111. a first roller shaft; 12. a first conveying unit; 13. a coating unit; 14. a second conveying unit; 15. a curing unit; 16. a winding unit; 161. a second roller shaft; 17. an alarm unit; 18. a control unit; 2. a transparent substrate; 3. an optical hardening film; 4. a first optical detection device; 5. a first marking device; 51. a first marking machine; 52. a second marking machine; 6. a second optical detection device; 7. a second marking device; 71. a third marking machine; 72. a fourth marking machine; 8. a third optical detection device; 91. a first storage unit; 911. a third roller shaft; 92. a second storage unit; 921. and a fourth roller shaft.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows: as shown in fig. 1 and fig. 2, a defect detecting system for an optical hardened film trial production line comprises an unreeling unit 11 on which a transparent substrate 2 is wound, a first conveying unit 12, a coating unit 13 for coating a hardened coating liquid on the lower surface of the transparent substrate 2, a second conveying unit 14, a curing unit 15 for curing the hardened coating liquid on the transparent substrate 2 to form a transparent hardened layer, a reeling unit 16, an alarm unit 17 and a control unit 18, wherein the transparent substrate 2 is sequentially passed through the first conveying unit 12, the coating unit 13, the second conveying unit 14 and the curing unit 15 to obtain an optical hardened film 3, the optical hardened film 3 is reeled on the reeling unit 16, a first optical detecting device 4 and a first marking device 5 are sequentially arranged between the unreeling unit 11 and the first conveying unit 12 along a conveying direction, the first optical detecting device 4 is used for detecting defects on the transparent substrate 2, the defects detected by the first optical detection device 4 are marked as first defects, the first marking device 5 makes first marks on the upper surface of the transparent base material 2 according to the positions of the first defects, the first marks comprise first cross marks corresponding to the positions where the first defects are most serious and first graphic marks surrounding the first defects, and the shapes of the first graphic marks correspond to the types of the first defects.

In this embodiment, a second optical detection device 6, a second marking device 7 and a third optical detection device 8 are sequentially arranged between the curing unit 15 and the winding unit 16 along the conveying direction, the second optical detection device 6 is used for detecting defects on the optical cured film 3, the defects detected by the second optical detection device 6 are marked as second defects, the second marking device 7 makes second marks on the upper surface of the transparent substrate 2 according to the positions of the second defects, the second marks comprise second cross marks corresponding to the most serious positions of the second defects and second graphic marks surrounding the second defects, the shapes of the second graphic marks correspond to the types of the second defects, the third optical detection device 8 is used for identifying the first cross marks, a first graphic identification, a second letter identification, and a second graphic identification, and transmits the recognized image data to the control unit 18.

In this embodiment, the control unit 18 is configured to control the first optical detection device 4, the first marking device 5, the first conveying unit 12, the coating unit 13, the second conveying unit 14, the curing unit 15, the second optical detection device 6, the second marking device 7, the third optical detection device 8, the winding unit 16, and the alarm unit 17 to cooperate, and make the following determination according to the image data sent by the third optical detection device 8:

a. if the second cross mark is not in the range of the Lcm with the first cross mark at a certain position as the center, the first defect at the position can be completely covered by the transparent hardened layer;

b. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are the same as the shape of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer;

c. if 1-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, and the shapes of the second graphic marks corresponding to all the second cross marks in the Lcm range at the position are respectively different from the shape of the first graphic mark at the position, the first defect at the position can be completely covered by the transparent hardened layer, but a new defect is introduced in the coating process;

d. if 2-n second cross marks exist in the Lcm range with the first cross mark at a certain position as the center, the shape of the second graphic mark corresponding to part of the second cross mark in the Lcm range at the position is the same as that of the first graphic mark at the position, and the shape of the second graphic mark corresponding to the other part of the second cross mark in the Lcm range at the position is different from that of the first graphic mark at the position, the first defect at the position cannot be completely covered by the transparent hardened layer, and a new defect is introduced in the coating process;

e. if n +1 or more (including n + 1) second cross marks or at least one first cross mark exists in the Lcm range with the first cross mark at a certain position as the center, the control unit 18 controls the first optical detection device 4, the first marking device 5, the first conveying unit 12, the coating unit 13, the second conveying unit 14, the curing unit 15, the second optical detection device 6, the second marking device 7, the third optical detection device 8 and the winding unit 16 to stop running, and controls the alarm unit 17 to give an alarm;

f. if the first cross mark is not in the range of the Lcm with the second cross mark at a certain position as the center, indicating that the position is in the coating process and introducing a new defect;

wherein L is more than or equal to 0.2 and less than or equal to 1.5, and L is usually 1, and then fine adjustment is carried out according to actual production process parameters and the like; n is more than or equal to 5 and less than or equal to 10, n is a natural number, usually n is 5, and then fine adjustment is carried out according to actual production process parameters and the like.

In this embodiment, the first conveying unit 12 and the second conveying unit 14 are both of a conventional structure in the art, and are not developed here.

The defects randomly occurring in the production of the optical hardening film are known, all known defects are classified according to the types of the defects, the characteristics of all known defects are recorded into a database of a control unit to serve as a defect template, a plurality of pattern identifiers are preset in the database of the control unit, and each type of defect corresponds to one pattern identifier. When the types of any two first defects are the same, the shapes of the two first graphic identifications at the two first defects are the same, when the types of any two first defects are different, the shapes of the two first graphic identifications at the two first defects are different, when the type of a certain first defect is the same as that of a certain second defect, the shapes of the first graphic identification at the first defect and the second graphic identification at the second defect are the same, when the type of a certain first defect is different from that of a certain second defect, the shapes of the first graphic identification at the first defect and the second graphic identification at the second defect are different, for example, when the first defect and the second defect are scratch defects, an oval identification is adopted, when the first defect is a scratch defect, a rectangular identification is adopted, when the defect is a prick defect, a circular identification is adopted, when the defect is a white point defect, a triangular identification is adopted, and the like, specifically, the defect shape is adjusted according to actual conditions so as to surround the defect part as much as possible and to clearly distinguish different types of defects in terms of shape.

Example two: the rest of the embodiment is the same as the first embodiment, and is different in that the third optical detection device 8 is a color industrial camera, the first cross mark color is different from the second cross mark color, the first pattern mark color is different from the second pattern mark color, the first pattern mark shape is different from the second pattern mark shape, the position of the first pattern mark is partially overlapped or staggered with the position of the second pattern mark, and the third optical detection device 8 is used for effectively recognizing the color and shape of the first cross mark, the color and shape of the first pattern mark, the color and shape of the second cross mark, and the color and shape of the second pattern mark, and sending the recognized image data to the control unit 18.

In this embodiment, the unwinding unit 11 includes a first roller 111, and the transparent substrate 2 is wound around the first roller 111.

In this embodiment, the first optical inspection apparatus 4 and the second optical inspection apparatus 6 are both AOI automatic optical inspection apparatuses.

In this embodiment, the first marking device 5 includes a first marking machine 51 for marking a first cross mark and a second marking machine 52 for marking a first graphic mark, and both the first marking machine 51 and the second marking machine 52 use high temperature resistant and/or UV resistant quick-drying ink; the second marking device 7 comprises a third marking machine 71 for marking a second cross mark and a fourth marking machine 72 for marking a second graphic mark, wherein the third marking machine 71 and the fourth marking machine 72 both adopt commercially available quick-drying ink.

In the present embodiment, the winding unit 16 includes a second roller 161, and a rotating motor (not shown) for driving the second roller 161 to rotate, the optical hardening film 3 is wound around the second roller 161, and the rotating motor is electrically connected to the control unit 18.

Example three: the rest of the parts are the same as the first embodiment, and the difference is that a first storage unit 91 is arranged between the unreeling unit 11 and the first optical detection device 4, the first storage unit 91 includes a plurality of third shafts 911 and a first linear driving mechanism (not shown in the figure), the plurality of third shafts 911 are distributed in a vertically staggered manner, the transparent base material 2 is in a snake-shaped feeding form and passes through the plurality of third shafts 911, the first linear driving mechanism is electrically connected with the control unit 18, and the first linear driving mechanism is used for driving any one row of the third shafts 911 to move up and down.

In this embodiment, a second storage unit 92 is arranged between the second marking device 7 and the third optical detection device 8, the second storage unit 92 includes a plurality of fourth rollers 921 and a second linear driving mechanism (not shown), the plurality of fourth rollers 921 are distributed in a vertically staggered manner, the optical hardening film 3 is in a serpentine feeding form and passes through the plurality of fourth rollers 921, the second linear driving mechanism is electrically connected with the control unit 18, and the second linear driving mechanism is used for driving any one row of fourth rollers 921 to move up and down.

In the present embodiment, the alarm unit 17 is an acoustic-optical alarm.