CN113686877B

CN113686877B - Method and system for rapidly detecting surface defects of film

Info

Publication number: CN113686877B
Application number: CN202111010419.1A
Authority: CN
Inventors: 吴培服; 王琪; 吴迪; 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: 2024-05-07
Anticipated expiration: 2041-08-31
Also published as: CN113686877A

Abstract

The application discloses a rapid detection system for surface defects of a film, which is used for detecting the surface defects of the film through detection equipment after the film passes through a stretching roller and before entering a traction winding roller, wherein the rapid detection system for the surface defects of the film further comprises a steam spraying device which is arranged between the stretching roller and the detection equipment and used for spraying steam to the film. In addition, the application also discloses a method for rapidly detecting the defects on the surface of the film, which comprises the steps of spraying steam against the film before detecting the film, condensing the steam and adhering the steam to the surface of the film, so that the tiny defects on the surface of the film can be enhanced, the defects become more obvious under the fumigation of the steam and are more easily detected by subsequent detection equipment, and the detection accuracy and efficiency are improved.

Description

Method and system for rapidly detecting surface defects of film

Technical Field

The application relates to the field of film production and detection, in particular to a method and a system for rapidly detecting surface defects of a film.

Background

In prior art document CN 206740668U disclosed in the applicant's previous application, an online detection device for defects of a film is disclosed, which is used for online detecting defects of the film after the film passes through a stretching roller and before entering a traction winding roller, wherein the online detection device for defects of the film comprises a light source component arranged below the film, an image acquisition component arranged above the film and right to the light source component, and a rear end server connected with the image acquisition component. The film defect online detection equipment in the prior art can be used for shooting pictures through the image acquisition assembly and transmitting the pictures to the rear-end server for identification, and can be used for effectively detecting film defects, so that quality defect problems such as fish eyes, string points and the like on the surface of the film can be effectively controlled.

In the actual production process, the applicant finds that, especially in the film production with high technical and high quality requirements, some defects of the film appearance are often encountered, such as: scratches, oil stains, roll marks, fish eyes, coating or corona treatment are uneven, and these defects can cause trouble for post-processing by downstream customers, resulting in poor products. The prior art disclosed by the applicant has a certain degree of omission and misjudgment when detecting the unobvious defects, and needs to be solved.

Disclosure of Invention

The present application provides a method and a system for rapidly detecting defects on a film surface, so as to reduce or avoid the above-mentioned problems.

In order to solve the technical problems, the application provides a method for rapidly detecting surface defects of a film, which is used for detecting the surface defects of the film after the film passes through a stretching roller and before entering a traction winding roller, wherein the method comprises the following steps: steam is sprayed onto the film prior to the film being inspected.

Preferably, the vapor is formed by evaporation of a liquid in the following parts by weight:

Preferably, the steam is formed by evaporating a mixed solution of the following parts by weight: 80-100 parts of distilled water, 10-15 parts of sodium alkyl benzene sulfonate, 20-30 parts of ethanol and 1-2 parts of polydimethylsiloxane.

Preferably, the steam is sprayed onto the film from below the film.

Preferably, the method further comprises the step of drying the film after the detection.

The application also provides a rapid detection system for the surface defects of the film, which is used for detecting the surface defects of the film through detection equipment after the film passes through a stretching roller and before entering a traction winding roller, wherein the rapid detection system for the surface defects of the film further comprises a steam spraying device which is arranged between the stretching roller and the detection equipment and used for spraying steam to the film.

Preferably, the steam spraying device at least comprises a steam pipe with a plurality of threaded holes and a steam cover fixedly connected to the steam pipe through a plurality of threaded joints.

Preferably, the two ends of the threaded joint are provided with external threads, and the middle part is provided with a flange; the lower end of the screwed joint is in threaded connection with the threaded hole of the steam pipe, and the upper end of the screwed joint penetrates through the unthreaded hole on the steam cover and is connected with the nut.

Preferably, the steam hood has a W-shaped cross section, a flat portion is formed at the middle portion thereof, the flat portion contacts with the flange of the screw joint, and grooves are formed at both sides of the flat portion.

Preferably, the bottom outer side of the groove of the steam cover abuts against the outer surface of the steam pipe.

Preferably, the end edge of the steam hood is bent to form a plane part parallel to the surface of the film, and a soft felt is fixed on the surface of the plane part.

According to the method and the system for rapidly detecting the defects on the surface of the film, disclosed by the application, the steam is sprayed to the film before the film is detected, the tiny defects on the surface of the film can be enhanced by condensing the steam and adhering to the surface of the film, the defects become more obvious under the fumigation of the steam and are more easily detected by subsequent detection equipment, and the detection accuracy and efficiency are improved.

Drawings

The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application.

FIG. 1 is a schematic diagram of a system for rapidly detecting defects on a surface of a film according to an embodiment of the present application.

FIG. 2 is a schematic diagram showing a side view of a rapid detection system for surface defects of the film shown in FIG. 1.

Figures 3a-3f show examples of pictures of film surface defects before and after steaming, respectively.

Fig. 4 is a schematic perspective view showing a steam spraying apparatus according to an embodiment of the present application.

Fig. 5 is an exploded perspective view showing a steam spraying apparatus according to another embodiment of the present application.

Fig. 6 shows a schematic cross-sectional view of a steam injection apparatus according to yet another embodiment of the application.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals.

As described in the background art, for some insignificant surface defects on the film, the detection mode of the prior art is often not easy to find, so the present application proposes an improved rapid detection system for surface defects of the film, and particularly as shown in fig. 1-2, which respectively show a schematic structural diagram and a schematic side view structural diagram of the rapid detection system for surface defects of the film according to an embodiment of the present application.

As shown, the rapid detection system of surface defects of thin films of the present application may comprise a portion of CN 206740668U mentioned in the background, which is incorporated herein by reference as part of the present application, and other similar embodiments may be obtained by rational derivation by those skilled in the art, based on the disclosure of this prior art.

Specifically, the rapid detection system for surface defects of a film according to the present application can be used to detect surface defects of the film 100 by the detection apparatus 500 after the film 100 passes through the stretching roll 200 and before entering the pulling roll 300. The inspection apparatus 500 may be an online inspection apparatus for defects of thin films as described in the foregoing prior art, or any other apparatus that can be used to visually inspect surface defects.

The following description of the on-line detection device for defects in thin films illustrates the structure of a specific embodiment of the detection device 500 according to the present application, however, those skilled in the art can also search for other similar detection devices by reading the above description of the prior art to obtain more specific structures, functions and principles of the detection device 500, or derive other similar detection techniques according to the present application and the description of the prior art.

In one embodiment, as shown, the detection apparatus 500 that can be employed in the present application includes a light source module 1 disposed below a film 100, an image acquisition module 2 disposed above the film 100 and facing the light source module 1, and a back-end server 3 connected to the image acquisition module 2. In one embodiment, the image capturing assembly 2 includes a plurality of high-speed cameras 21 arranged laterally in a direction perpendicular to the advancing direction of the film 100, each of the high-speed cameras 21 being respectively connected to the backend server 3 by a circuit. The basic working principle of the detection device 500 is: first, the film 100 is transmitted by light emitted from the light source assembly 1, and then the film 100 is photographed by the image pickup assembly 2 above the film 100. If there are defective spots, such as so-called fish eyes, strings of spots, etc., on the film 100, the light under the film 100 will not completely penetrate the film 100 at these defective spot locations, spots will be formed on the photo taken by the image capturing assembly 2, and the locations without defects will be the color of the light source only on the photo. The photos obtained by the image acquisition component 2 are transmitted to the back-end server 3 on line in real time through a circuit, and the shooting moment of each photo is also transmitted to the back-end server 3. The pull-up roll 300 is provided with a meter (not shown) for measuring the length of the film 100, and the meter operates in synchronization with the pull-up roll, and the value of the meter at the time of photographing is also transmitted to the back-end server 3. After the photo is transmitted to the back-end server 3, the photo is identified by the identification software running on the back-end server 3, if no defect exists, a pure white image is displayed, if a defect exists, spots are formed on a white background, the size of the spots is identified by the identification software, for example, if the diameter of the spots is larger than a preset value, the defect exists is determined, the photo is automatically marked by the software, the shooting time and the size of the defect are recorded, and the longitudinal and transverse coordinates of the defect on the film 100 are determined by the shooting time, the corresponding meter and the position calculation of the high-speed camera 21, and the defect is positioned and recorded. If a large or regular defect is encountered, the production process, raw materials, equipment and the like are likely to be faulty, an alarm can be set through software, and the equipment can be turned off in an emergency after the defect photo is verified manually, so that the continuous loss caused by the generation of a large amount of waste products is avoided. Finally, each batch, roll of film product, having a number of defects verified, can be rated for classification based on market consumption.

As described in the background, the detection device 500 of the above embodiment has a poor detection effect on some surface defects on the film, which are not obvious, and thus the present application is further improved on this basis. As shown, the rapid inspection system of film surface defects of the present application further includes a steam spraying device 400 which sprays steam to the film 100, disposed between the stretching roller 200 and the inspection apparatus 500. That is, the present application adds a step of spraying steam to the film 100 before the film 100 is inspected on the basis of the prior art.

The basic working principle of the application is as follows: before the film is detected, steam is sprayed to the film, and the steam is condensed and attached to the surface of the film, so that tiny defects on the surface of the film can be enhanced, the defects become more obvious under the fumigation of the steam and are more easily detected by subsequent detection equipment, and the detection accuracy and efficiency are improved.

Fig. 3a-3f show examples of pictures of surface defects of the film before and after steaming, respectively, wherein fig. 3a, 3c, 3e are images before steaming, and fig. 3b, 3d, 3f correspond to fig. 3a, 3c, 3e, respectively, showing images after steaming. It is evident therefrom that the surface of the film after fumigation forms a distinct texture, and that the pattern and structure of defects can be readily discerned, which are difficult to display so distinctly without fumigation.

Further, in order to obtain a better adhesion development effect, the steam of the present application may be formed by evaporating a mixed solution of the following parts by weight: 80-100 parts of distilled water, 10-15 parts of sodium alkyl benzene sulfonate, 20-30 parts of ethanol and 1-2 parts of polydimethylsiloxane.

The following tables correspond to the composition of the mixed solutions employed in fig. 3b, 3d, 3f, respectively.

It can be seen from fig. 3b, 3d, 3f that the above components can be applied to the present application to obtain a good developing effect.

In addition, as shown, steam is preferably sprayed onto the film 100 from below the film, which facilitates the rapid removal of excess condensate from the film surface, avoiding the formation of a drooling watermark on the film. Of course, since the steam is a lean gas having a small water content after all, it is also possible to provide the steam to be injected toward the film from other directions. If the film surface temperature is too low, condensation watermarks are formed, and of course, the film surface temperature is relatively high when the film is stretched, and the probability of instantaneous condensation of thin steam is not very high, so that even spraying the film from above is an acceptable scheme.

Specific embodiments of the steam spraying apparatus of the present application are further described below with reference to fig. 4-6. Which show a schematic perspective view, an exploded perspective view and a schematic cross-sectional view of a steam spraying device according to an embodiment of the present application, respectively.

As shown, the steam spraying apparatus 400 of the present application may include at least one steam pipe 401 having a plurality of screw holes 4011 and a steam cover 402 fixedly coupled to the steam pipe 401 by a plurality of screw joints 403.

The steam pipe 401 comprises a working pipe with a thicker middle diameter and steam inlet pipes with thinner diameters on two sides, and can be used for introducing high-temperature steam into the working pipe from two ends through the steam inlet pipes, and can also be used for introducing steam from one end and guiding the steam with reduced temperature back to a steam boiler (not shown in the figure) from the other end. A plurality of threaded holes 4011 are provided in a row on the work pipe for connecting threaded joints 403.

The steam may be generated by means well known in the art and directed through a pipe into steam pipe 401, for example, the steam may be generated by a steam boiler. In addition, the pressure, temperature, and flow rate of the steam supplied to the steam pipe 401 may be adjusted a plurality of times according to the actual operation by a known pressure gauge, thermometer, flow meter, or the like until a defect that can significantly show the surface of the film is reached.

The steam shield 402 is used to enclose the injected steam against the film 100 in a range such that the injected steam reaches the film 100 as uniformly as possible. In addition, when the steam spraying device 400 is disposed below the film 100 as shown in fig. 2, the steam cover 402 may also be used to catch the cooling liquid that is condensed and falls by the steam, so as to avoid the cooling liquid from accumulating on the film to form a drool watermark.

As can be seen in detail in fig. 6, the threaded joint 403 is provided with external threads at both ends and a flange 4031 in the middle; the lower end of the nipple 403 is screwed into the threaded hole 4011 of the steam pipe 401, and the upper end passes through the light hole 4021 of the steam shield 402 and is connected to the nut 405. The center of the longitudinal axis of the screwed joint 403 is provided with an injection hole 4032 with a reduced middle and expanded two ends, and the injection hole 4032 with the structure can accelerate the flow speed of air flow and disperse injected steam so as to reduce the volume of liquid drops in the steam, avoid the formation of condensed water as much as possible, and be beneficial to obtaining a more uniform steam film.

The steam shield 402 is generally W-shaped in cross section with a land portion 4022 formed in the middle thereof in contact with the flange 4031 of the threaded joint 403, and a groove 4023 formed on each side of the land portion 4022. The steam shield 402 with a W-shaped cross section may be as shown in fig. 6, wherein the bottom outer side of the groove 4023 of the steam shield 402 abuts against the outer surface of the steam pipe 401, so that the steam shield 402 may be kept on the steam pipe 401 in balance, and the steam shield 402 is prevented from twisting and swinging under the action of air flow. This is because the steam shield 402 is large and can only be made of thin-walled metal, so that the rigidity is small, and by making it in the form of a W-shaped section, it is possible to obtain both a greater rigidity and a bottom structure that encloses the steam pipe 401, with a better stability, and at the same time it is possible to obtain grooves 4023 on both sides for accommodating the dropped condensate water. In one embodiment, the grooves 4023 of the steam shield 402 may be in communication with a diversion conduit (not shown) to facilitate drainage of condensate water that has dropped into the grooves 4023.

To avoid leakage of condensed water and air leakage, in one embodiment, a rubber gasket 404 may be provided between the nut 405 and the steam shield 402. Of course, since the nut 405 is located at a high position, there is a small chance of leakage of a large amount of liquid, and the rubber gasket 404 is provided to prevent the steam hood 402 from leaking at the mounting position, so as to enhance the effect of the steam forward spraying film formation.

In another embodiment, a flat portion 4024 is formed by bending the end edge of the steam mask 402 in parallel to the surface of the film, and the flat portion 4024 may be fixed with a soft felt (not shown) to prevent the end edge of the steam mask 402 from being scratched by contact with the film.

It should be understood by those skilled in the art that while the present application has been described in terms of several embodiments, not every embodiment contains only one independent technical solution. The description is given for clearness of understanding only, and those skilled in the art will understand the description as a whole and will recognize that the technical solutions described in the various embodiments may be combined with one another to understand the scope of the present application.

The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this application, and it is intended to be within the scope of the application.

Claims

1. A method for rapidly detecting surface defects of a film (100) after the film (100) passes through a stretching roll (200) and before entering a pulling wind-up roll (300), the method comprising the steps of: spraying steam onto the film (100) prior to detecting the film (100); the steam is formed by evaporating the following mixed solution in parts by weight: 80-100 parts of distilled water, 10-15 parts of sodium alkyl benzene sulfonate, 20-30 parts of ethanol and 1-2 parts of polydimethylsiloxane.

2. The method according to claim 1, wherein the steam is sprayed onto the membrane (100) from below the membrane (100).

3. The method of claim 1, further comprising the step of drying the film (100) after the detecting.

4. A rapid detection system for surface defects of a film (100) for detecting the surface defects of the film (100) by a detection device (500) after the film (100) passes through a stretching roller (200) and before entering a traction wind-up roller (300), characterized in that the rapid detection system for surface defects of a film further comprises a steam spraying device (400) arranged between the stretching roller (200) and the detection device (500) for spraying steam to the film (100); the steam is formed by evaporating the following mixed solution in parts by weight: 80-100 parts of distilled water, 10-15 parts of sodium alkyl benzene sulfonate, 20-30 parts of ethanol and 1-2 parts of polydimethylsiloxane.

5. The rapid detection system according to claim 4, wherein the steam injection apparatus (400) comprises at least one steam pipe (401) having a plurality of screw holes (4011) and a steam hood (402) fixedly connected to the steam pipe (401) by a plurality of screw joints (403).

6. The rapid detection system according to claim 5, characterized in that the threaded joint (403) is provided with external threads at both ends, and a flange (4031) in the middle; the lower end of the screwed joint (403) is connected with a screwed hole (4011) of the steam pipe (401) in a screwed way, and the upper end of the screwed joint passes through a unthreaded hole (4021) on the steam cover (402) and is connected with the nut (405).

7. The rapid inspection system of claim 6, wherein the steam shield (402) has a W-shaped cross section with a land portion (4022) formed therein in contact with the flange (4031) of the nipple (403), and a groove (4023) is formed on each side of the land portion (4022).

8. The rapid detection system of claim 7, wherein a bottom outside of the groove (4023) of the steam shield (402) abuts an outer surface of the steam pipe (401).

9. The rapid inspection system of claim 8, wherein the distal edge of the vapor enclosure (402) is folded to form a planar portion (4024) parallel to the surface of the membrane, the surface of the planar portion (4024) having a soft felt secured thereto.