CN215903995U

CN215903995U - Detection system for corona treatment surface of film

Info

Publication number: CN215903995U
Application number: CN202122086273.0U
Authority: CN
Inventors: 吴培服; 王琪; 池卫
Original assignee: Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Current assignee: Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-02-25
Anticipated expiration: 2031-08-31

Abstract

The application discloses detection system of film corona treatment surface includes at least one powder discharge device and the lower charging basket of setting in powder discharge device's below to the corona treatment surface release powder of film. This application can form macroscopic powder distribution image on whole film surface through releasing the powder to the film surface, can the whole electrostatic field that remains of audio-visual reaction, and then can judge whether even on the corona treatment surface of film. The scheme of the application is simple and easy to operate, and whether the microstructure of the large-area film corona treatment surface is uniform or not can be judged in a very short time.

Description

Detection system for corona treatment surface of film

Technical Field

The application relates to a detection system for a corona treated surface of a thin film.

Background

In film post-processing, such as printing, release film processing, in particular high tech, high quality requiring release film processing, corona treatment is usually required. Corona treated film surfaces can produce fine structural variations, and it is generally desirable that these fine structures on the film surface be as uniform as possible. However, since the structure is too fine, it is difficult to perform macro-detection over a large area if the detection is performed microscopically by only local sampling. The liquid coating method and the stroke test method in the prior art can not perform macroscopic detection on the surface of a large-area film, and the methods have the disadvantages of high operation difficulty, complex technical requirements and low detection efficiency.

Disclosure of Invention

The technical problem to be solved by the present application is to provide a detection system for corona treated surfaces of thin films to reduce or avoid the aforementioned problems.

In order to solve the technical problem, the application provides a detection system for a corona treatment surface of a film, which at least comprises a powder releasing device for releasing powder to the corona treatment surface of the film and a blanking basket arranged below the powder releasing device.

Preferably, the film is conveyed obliquely upward, the powder discharge device being disposed upstream of the advancing direction of the film; a detection device is provided downstream of the advancing direction of the film.

Preferably, the powder discharge device includes an upper casing, a lower casing, and a rotating impeller provided inside the upper casing and the lower casing.

Preferably, the top of the upper shell is provided with a feed inlet; the bottom of the lower shell is provided with a discharge hole aligned with the lower blanking basket; and a powder release slit aligned with the film is formed on the buckling surface of the upper shell and the lower shell.

Preferably, an elastic adjusting plate is arranged inside the powder releasing slit, one side of the elastic adjusting plate is fixedly connected inside the powder releasing slit, and the other side of the elastic adjusting plate is abutted against the side surface of the powder releasing slit through an adjusting bolt to adjust the opening angle of the powder releasing slit.

Preferably, a blanking roller located at the upper end of the discharge port is arranged in the lower shell, and the vertical projection plane of the blanking roller is larger than or equal to the cross section of the discharge port.

This application can form macroscopic powder distribution image on whole film surface through releasing the powder to the film surface, can the whole electrostatic field that remains of audio-visual reaction, and then can judge whether even on the corona treatment surface of film. The scheme of the application is simple and easy to operate, and whether the microstructure of the large-area film corona treatment surface is uniform or not can be judged in a very short time.

Drawings

The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application.

FIG. 1 shows a schematic diagram of a thin film corona treated surface inspection system according to one embodiment of the present application.

Figures 2a-2b show images of powder distribution after the powder is attached to the corona treated surface of the film, respectively.

Fig. 3 shows an exploded perspective view of the powder discharge device and the blanking basket of fig. 1.

FIG. 4 shows an exploded perspective view of a powder release device according to an embodiment of the present application.

Fig. 5 shows a schematic cross-sectional view of a powder release device according to another embodiment of the present application.

Fig. 6 shows a schematic perspective view of a lower housing of a powder discharge apparatus according to yet another embodiment of the present application.

Fig. 7 is a side view of a lower housing of a powder discharge apparatus according to still another embodiment of the present application.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present application, embodiments of the present application will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.

As described in the background art, the prior art lacks a technology for performing macroscopic detection on a corona microstructure of a large-area film surface, so that the application provides a simple, easy and convenient detection method, which can judge whether the microstructure of the large-area film corona-treated surface is uniform or not in a very short time.

Fig. 1 is a schematic diagram showing a structure of a system for inspecting a corona-treated surface of a thin film according to an embodiment of the present application, and as shown in the drawing, an overview of the inspection method of the corona-treated surface of the thin film of the present application may include the following steps: the powder is first discharged to the corona-treated surface (shown as the upper surface) of the film 100, and then the uniformity of the corona-treated surface of the film 100 is judged from the powder distribution image attached to the corona-treated surface of the film 100.

The basic working principle of the application is as follows: the corona treatment applies high-frequency high-voltage electricity to the surface of the film, so that strong static electricity can be generated on the surface of the film, if the structure of the surface of the film is uniform, the electrostatic field on the surface of the film can be kept uniform, otherwise, uneven static electricity residue is generated at the place where the structure of the surface of the film is uneven, and the subsequent processing is not good due to the uneven static electricity residue, such as uneven release agent coating. According to the principle, when powder is released to the corona treatment surface of the film, the powder is influenced by static electricity and is attached to the surface of the film, a distribution image capable of reflecting the form of a residual electrostatic field is formed, and whether the corona treatment surface of the film is uniform or not can be judged.

Figures 2a-2b show, respectively, the powder distribution images after the powder has adhered to the corona treated surface of the film, and it is apparent from these figures that the powder distribution image of figure 2a is relatively random and not very uniform, whereas the powder distribution image of figure 2b is relatively uniform over most of its area, and thus can be seen visually, the corona treated surface of figure 2a is not very uniform, and the corona treated surface of figure 2b is relatively more uniform.

In the configuration shown in fig. 1, the inspection system for corona-treated surface of thin film of the present application includes at least one powder discharge device 200 for discharging powder to corona-treated surface of thin film 100 and a hopper basket 300 disposed below powder discharge device 200. In the illustrated embodiment, the film 100 is conveyed obliquely upward around the surface of the material roller 400, and the powder discharge device 200 discharges the powder upstream in the advancing direction of the film 100, so that a recognizable powder distribution image is formed downstream in the advancing direction of the film 100. The advantage of the obliquely upward transportation of the film 100 is that the excessive released powder can naturally slide down into the blanking basket 300 by virtue of its gravity, avoiding the image interference caused by the excessive powder accumulated unnaturally; if the film 100 is conveyed vertically upward, there is a fear that the residual electrostatic force is not strong enough to completely adsorb the powder to the film surface against the gravity of the powder, and the slope of the film conveyance obliquely upward is preferably 30 to 70 degrees. Here, the upstream and downstream are with respect to the advancing direction of the film, and are not related to the vertical positional relationship of the illustrated structure.

As mentioned above, the detection method for the corona treatment surface of the film is very intuitive, and the released powder can be paved on the whole film surface, so that a macroscopic powder distribution image can be formed on the whole film surface, and the uniformity of the corona treatment surface can be judged by the technicians in the field through visual observation.

Of course, for large-scale industrial production, the uniformity is judged by visual observation, which is obviously not very stable, on one hand, the uniformity is too hard and easy to leak, and on the other hand, the interference of human factors is also very large and the accuracy is not high. Therefore, in the embodiment shown in fig. 1, the detection device 500 may be disposed downstream in the advancing direction of the film 100, and the powder distribution image may be subjected to an operation such as recognition determination by the detection device 500.

That is, the present application can judge the uniformity of the corona-treated surface of the thin film by visual observation after the powder is discharged to form the powder distribution image, and can also perform detection using any one of the existing detection apparatuses.

For example, in the prior art document CN 206740668U published by the applicant's previous application, an on-line defect detecting apparatus for a thin film is disclosed, which can be used for on-line defect detection of the thin film. Therefore, the inspection apparatus 500 of the inspection system for thin film corona treated surfaces of the present application may also be similar to the inspection apparatus of the prior art, which is incorporated herein as a part of the present application by way of example, and other similar embodiments may be obtained by those skilled in the art through reasonable derivation based on the disclosure of the prior art.

The structure of one embodiment of the inspection apparatus 500 of the present application is illustrated below according to the on-line inspection apparatus for film defects described in the prior art CN 206740668U, but of course, a person skilled in the art can also retrieve other similar inspection apparatuses by reading the above-mentioned prior art to obtain more specific structure, function and principle of the inspection apparatus 500, or derive other similar inspection techniques according to the present application and the description of the prior art.

In one embodiment, as shown, the inspection apparatus 500 that can be used in the present application includes a light source assembly 1 disposed below the film 100, an image capturing assembly 2 disposed above the film 100 opposite to the light source assembly 1, and a back-end server 3 connected to the image capturing assembly 2. The basic working principle of the detection device 500 is: first, the film 100 is transmitted through the light emitted from the light source assembly 1, and then the film 100 is photographed through the image pickup assembly 2 above the film 100. The pictures obtained by the image acquisition assembly 2 are transmitted to the back-end server 3 on line in real time through a circuit, and the shooting time of each picture is also transmitted to the back-end server 3. Further, the material roll 400 is provided with a meter counter (not shown) for measuring the length of the film 100, and the meter counter and the material roll 400 operate in synchronization, and the value of the meter counter at the time of taking a photograph is also transmitted to the back-end server 3. After the picture is transmitted to the back-end server 3, the picture is recognized through recognition software running on the back-end server 3, if the picture is uniform, the displayed picture is similar to a pure-color picture, if the picture has a non-uniform place, irregular spots exist, the size of the spots is recognized through the recognition software, for example, if the diameter of the spots is larger than a preset numerical value, the defects are determined, the picture is automatically marked through the software, the shooting time and the defect size are recorded, the vertical and horizontal coordinates of the defects on the film 100 are determined through the shooting time, the corresponding meter counter and the position calculation of the high-speed camera of the image acquisition assembly 2, and the defects are located and recorded. If a large or regular defect is met, the production process, raw materials, equipment and the like possibly have faults, the alarm can be set through software, and the equipment can be shut down emergently after a defect photo is verified manually, so that loss caused by continuous waste in large quantities is avoided. Finally, after the number of defects of each batch and each roll of film products is verified, the film products can be graded and classified according to market consumption conditions.

Further, in order to make the powder distribution image easier to record and recognize, the powder used in the present application may preferably be made of a material that is more easily electrostatically adsorbed, preferably a nano-powder that is white under white light irradiation and has a relatively small density. For example, one or a mixture of calcium carbonate, magnesium sulfate, silica, sodium carbonate, sodium bicarbonate, aluminum sulfate, aluminum potassium sulfate, etc., having a particle size of 0.1 to 200 μm may be used. The powder adhering to the surface of the film may remain as an anti-blocking ingredient, or may be removed by subsequent wiping or washing with water.

Specific embodiments of the thin film corona treated surface detection system of the present application are further described below with reference to FIGS. 3-7. Wherein fig. 3 shows an exploded perspective view of the powder discharge device and the blanking basket of fig. 1; FIG. 4 shows an exploded perspective view of a powder release device according to an embodiment of the present application; FIG. 5 shows a schematic cross-sectional view of a powder release device according to another embodiment of the present application; FIG. 6 is a schematic perspective view of a lower housing of a powder discharge apparatus according to yet another embodiment of the present application; fig. 7 is a side view of a lower housing of a powder discharge apparatus according to still another embodiment of the present application.

As described above, the inspection system for corona-treated surface of film of the present application includes at least one powder discharge device 200 for discharging powder to corona-treated surface of film 100 and a hopper basket 300 disposed below powder discharge device 200.

In the illustrated embodiment, the discharge basket 300 is a rectangular box with an open top, semicircular notches 301 are formed at both sides of the discharge basket 300 to match the surfaces of the feed rollers 400, and notches 302 corresponding to the width and height of the film 100 are formed at the side of the discharge basket 300 facing the film 100. The gap matched with the material roller 400 and the film 100 is arranged, the purpose is to limit powder in the area range of the blanking basket 300 as much as possible, and damage to the health of operators due to dust diffusion is avoided. In addition, in order to facilitate the moving and positioning installation, a lifting roller (not shown) may be further provided at the bottom of the blanking basket 300, and after the material in the blanking basket 300 is filled, the height of the blanking basket 300 may be lowered to remove the blanking basket 300 from below the material roller 400.

The powder discharge device 200 is an elongated column that matches the width of the film 100, and since the structure is a thin-walled elongated structure, the surface is provided with many reinforcing ribs for strength, as shown in the figure. The powder discharge apparatus 200 includes an upper casing 201, a lower casing 202, and a rotary impeller 203 provided inside the upper casing 201 and the lower casing 202. In one embodiment, the top of the upper shell 201 is provided with a feed inlet 2011; the bottom of the lower shell 202 is provided with a discharge hole 2021 aligned with the lower blanking basket 300; the fastening surfaces of the upper case 201 and the lower case 202 are formed with powder discharge slits 2012 aligned with the film 100, and the width of the powder discharge slits 2012 is preferably greater than the width of the film 100.

Powder is fed into the powder discharge device 200 from the feed inlet 2011 of the upper housing 201 through a conveying device (not shown in the figure, for example, a conveying pipeline and the like), the rotating impeller 203 is driven by an external driving mechanism (not shown in the figure, for example, a motor driving a belt and the like) to rotate at a high speed, a rotating airflow is formed in the powder discharge device 200, and therefore fine powder is stirred up and is discharged to the surface of the film 100 along with the airflow from the powder discharge slit 2012. For clarity and understanding, the structures of the conveying pipeline, the motor, the belt and the like which are exemplified in brackets are omitted in the figures, and other structures such as small bearings are not shown in the figures, and the structure of the application can be easily understood by those skilled in the art based on common knowledge.

It should be noted that when the rotating impeller 203 rotates at a high speed, the powder inside is discharged in any outlet direction. Therefore, the feed opening 2011 preferably only has an opening for sealing connection with the conveyor, and the rest of the feed opening is preferably sealed, so that no dust can diffuse from the feed opening 2011 into the working environment. In addition, it is also necessary to take care that the powder impacts the powder in the blanking basket 300 from the discharge port 2021 under the action of the airflow, resulting in dust diffusion. Therefore, on one hand, the size of the discharge port 2021 is controlled, and on the other hand, the end of the discharge port 2021 is extended into the bottom of the basket 300 as much as possible.

In another embodiment of the present application, a blanking roller 2025 is disposed inside the lower housing 202 and located at the upper end of the discharging opening 2021, and a vertical projection plane of the blanking roller 2025 is greater than or equal to the cross section of the discharging opening 2021, as shown in the figure. The purpose of the blanking roller 2025 is to seal the upper end of the discharge port 2021, and to prevent the powder inside from falling into the blanking basket 300 in a short time, thereby requiring the powder to be continuously fed from the feed port 2011. The blanking roller 2025 may be made of a light material such as foam-wrapped rubber or plastic or a metal sheet, so long as the upper end of the discharge port 2021 can be substantially sealed, and the light weight also facilitates the installation thereof inside the lower case 202.

Of course, if the improper operation causes the powder inside the powder discharging device 200 to be too much, the powder discharging slit 2012 may be blocked, and therefore, in one embodiment of the present application, the blanking roller 2025 may move up and down in the vertical direction. Specifically, referring to fig. 6 and 7, two long holes 2026 are respectively formed on two sides of the lower housing 202, a rotating shaft 2027 connected to the blanking roller 2025 is inserted into the long holes 2026, and the rotating shaft 2027 is lifted along the long holes 2026, so that the blanking roller 2025 can be lifted, and the upper end of the discharge port 2021 blocked by the blanking roller 2025 can be opened, and the excess powder can be slid into the blanking basket 300 through the exposed gap.

Further, in order to control the amount of the released powder, in an embodiment of the present application, an elastic adjusting plate 2023 is disposed inside the powder releasing slot 2012, one side of the elastic adjusting plate 2023 is fixedly connected inside the powder releasing slot 2012, and the other side of the elastic adjusting plate 2023 abuts against the side surface of the powder releasing slot to adjust the opening angle thereof by an adjusting bolt 2024, as shown in fig. 5 and 7. The larger the angle at which the elastic regulation plate 2023 is lifted upward, the smaller the throat formed at the tip thereof, the smaller the amount of powder that can be discharged, whereas the smaller the angle at which the elastic regulation plate 2023 is lifted, the larger the amount of powder that can be discharged. In the illustrated embodiment, the spring-adjusting plate 2023 is fixed to the lower case 202 by rivets. Of course, in another embodiment not shown, the elastic adjustment plate 2023 may also be fixed to the upper case 201 by rivets.

To sum up, this application can form macroscopic powder distribution image on whole film surface through releasing the powder to the film surface, can the whole residual electrostatic field of visual reaction, and then can judge whether even on the corona treatment surface of film. The scheme of the application is simple and easy to operate, and whether the microstructure of the large-area film corona treatment surface is uniform or not can be judged in a very short time.

It should be appreciated by those skilled in the art that while the present application is described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is thus given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims and are to be interpreted as combined with each other in a different embodiment so as to cover the scope of the present application.

The above description is only illustrative of the present invention and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of this application shall fall within the scope of this application.

Claims

1. A system for detecting corona-treated surfaces of films, comprising at least one powder discharge device for discharging powder onto corona-treated surfaces of films and a discharge basket disposed below the powder discharge device.

2. The inspection system according to claim 1, wherein the thin film is conveyed obliquely upward, and a powder discharge device is provided upstream of an advancing direction of the thin film; a detection device is provided downstream of the advancing direction of the film.

3. The detection system of claim 2, wherein the powder discharge device comprises an upper housing, a lower housing, and a rotating impeller disposed inside the upper and lower housings.

4. The detection system of claim 3, wherein the top of the upper housing is provided with a feed port; the bottom of the lower shell is provided with a discharge hole aligned with the lower blanking basket; and a powder release slit aligned with the film is formed on the buckling surface of the upper shell and the lower shell.

5. The detection system as claimed in claim 4, wherein an elastic adjustment plate is disposed inside the powder discharge slit, and one side of the elastic adjustment plate is fixedly connected inside the powder discharge slit, and the other side of the elastic adjustment plate abuts against the side surface of the powder discharge slit through an adjustment bolt to adjust the opening angle of the powder discharge slit.

6. The detection system as claimed in claim 5, wherein a blanking roller is disposed in the lower housing at the upper end of the discharge port, and the vertical projection plane of the blanking roller is greater than or equal to the cross section of the discharge port.