On-line detection device for coating quality of hot stamping foil

Abstract

The utility model discloses an electrochemical aluminum hot stamping foil coating quality on-line detection device, which relates to the technical field of winding equipment, is arranged on an electrochemical aluminum hot stamping foil coating production line and comprises a coating mechanism, a coating thickness and uniformity detection mechanism and a coating surface defect identification mechanism. The coating mechanism comprises a supporting wall plate, a base material guide roller, a coating roller and a drying box; the coating thickness and uniformity detection mechanism is sequentially provided with a front low-position guide roller, a front detection box, a horizontal high-position guide roller, a rear detection box and a rear low-position guide roller, and the coating thickness and uniformity are detected through laser; the coating surface defect recognition mechanism comprises a light source, an image acquisition device and a defect detection unit, and recognizes surface defects through image comparison. According to the device, multi-sensor data fusion and an intelligent algorithm are combined, upgrading from single-index detection to whole-process quality control is achieved, production problems can be fed back in real time, detection precision and efficiency are improved, and modern online detection requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of winding equipment technology, specifically to an online detection device for the coating quality of electroplated aluminum hot stamping foil. Background Technology

[0002] Electroplated aluminum hot stamping foil is a composite material widely used in packaging, printing, decoration and other fields. Its core function is to transfer patterns, text and other designs to the surface of the substrate through hot stamping process to achieve decorative or marking effects. Coating quality is one of the key factors that determines the performance of electroplated aluminum hot stamping foil, and directly affects the hot stamping effect and service life, such as clarity, adhesion, and gloss.

[0003] Currently, many companies still rely on manual observation of defects such as bubbles and pinholes on the coating surface and verify adhesion and hot stamping effect through trial hot stamping. This method is highly subjective, inefficient, and cannot detect micro-defects. Furthermore, the detection methods are mostly batch sampling, which cannot provide real-time feedback on production problems. For the detection of the layer thickness and uniformity of electroplated aluminum hot stamping foil, many manufacturers still use simple back-projection light sources combined with visual inspection, which is far from meeting the high precision and online detection requirements of modern non-contact detection technology. Summary of the Invention

[0004] To address the problems existing in the background technology, this application provides an online detection device for the coating quality of electroplated aluminum hot stamping foil. It focuses on three major dimensions: detection of the thickness uniformity of the coating set before aluminum plating of electroplated aluminum hot stamping foil, identification of surface defects, and monitoring of tension and temperature. At the same time, it combines multi-sensor data fusion and intelligent algorithm optimization to achieve an upgrade from single index detection to full-process quality control.

[0005] To achieve the above objectives, this application adopts the following technical solution: an online detection device for the coating quality of electroplated aluminum hot stamping foil, which is installed on the electroplated aluminum hot stamping foil coating production line, characterized in that it includes a coating mechanism, a coating thickness and uniformity detection mechanism, and a coating surface defect identification mechanism.

[0006] The coating mechanism includes two supporting wall panels 1, a substrate guide roller 2, and a coating roller 3 that is in contact with the substrate guide roller 2. The lower part of the coating roller 3 is immersed in the coating liquid. A drying box 4 is set above the coating roller 3, and corresponding mechanisms for airflow regulation and temperature control are set inside it.

[0007] The dried hot stamping foil is taken out from the drying chamber 4 and sent to the coating thickness and uniformity detection mechanism. This mechanism includes, in sequence, a front low-position guide roller 5, a front detection box 6, two horizontal high-position guide rollers 7 set at the same height, a rear detection box 8, and a rear low-position guide roller 9. The front low-position guide roller 5 and the rear low-position guide roller 9 have a height difference with the horizontal high-position guide roller 7, guiding the traction hot stamping foil into an inclined state. The front detection box 6 covers the first horizontal high-position guide roller 7 and contains a laser emitter 6-1, a reflected light receiver 6-2, and a controller. The controller is connected to a display and an alarm. The coating thickness is calculated by measuring the distance difference between the upper and lower surfaces of the coating and the result is output. If the detected coating thickness exceeds the specified range, it is displayed and an alarm is triggered. Furthermore, with the vertical line between the midpoints of the two horizontal high-position guide rollers 7 at the same height as the axis of symmetry, the second horizontal high-position guide roller 7, the rear detection box 8, and the rear low-position guide roller 9 are symmetrically installed.

[0008] Behind the coating thickness and uniformity detection mechanism, a coating surface defect identification mechanism is provided, including a light source 10 and an image acquisition device 11. The light source 10 is located between the second horizontal high guide roller 7 and the rear low guide roller 9, and is located below the hot stamping foil. The light source 10 is arranged parallel to the hot stamping foil to ensure that its illumination angle covers the entire hot stamping foil that the row passes through.

[0009] The image acquisition device 11 is installed on the other side of the hot stamping foil opposite to the position of the light source 10, and acquires the image formed on the back of the foil after being illuminated by the light source 10. A defect detection unit is set up next to the image acquisition device 11 and the two are directly connected. The real-time image of the hot stamping foil coating image acquired by the image acquisition device 11 under the back projection light source 10 is directly transmitted to the defect detection unit, which compares the real-time image with the standard image. When a defect is identified in the cigarette packaging image, the specific location is recorded.

[0010] Preferably, the rear ends of the front low-position guide roller 5 and the rear low-position guide roller 9 are mounted on the support wall plate 1 with the sliding groove 1-1, and their heights are adjusted by a lifting device connected to their rear ends, thereby changing the travel angle of the hot stamping foil passing over the roller surfaces of the front low-position guide roller 5 and the rear low-position guide roller 9; the maximum height of the front low-position guide roller 5 and the rear low-position guide roller 9 is flush with the horizontal high-position guide roller 7, and the angle adjustment range of the hot stamping foil is between 0° and 60°.

[0011] Preferably, the light source 10 includes a housing 10-1 and a lighting assembly 10-2; a transparent glass plate is installed on the top surface of the housing 10-1, and the lighting assembly 10-2 is installed on the bottom inside the housing 10-1, including several LED light modules, which are arranged at equal intervals and controlled by an independent switch to realize the switching and brightness adjustment of any LED light module.

[0012] The detection device described in this application achieves online detection of the coating quality of electroplated aluminum hot stamping foil through the coordinated operation of multiple mechanisms. Its specific operation process and beneficial effects are as follows:

[0013] ① Substrate coating and drying

[0014] The electroplated aluminum hot stamping foil substrate is pulled by both sides of the support wall plate 1 and conveyed to the coating area by the substrate guide roller 2; the lower part of the coating roller 3 is immersed in the coating liquid and is in contact with the substrate guide roller 2 to evenly coat the liquid on the surface of the substrate to form a coating; the coated substrate is pulled to the drying oven 4, where the coating is dried by the airflow regulation and temperature control mechanism to remove moisture or solvent.

[0015] ② Coating thickness and uniformity testing

[0016] After drying, the hot stamping foil is guided by the front low-position guide roller 5 and enters the area of ​​the first horizontal high-position guide roller 7 in an inclined state. The laser emitter 6-1 in the front detection box 6 emits a laser, which shines on the surface of the hot stamping foil coating. The reflected light receiver 6-2 receives the reflected signal. The controller calculates the distance difference between the upper and lower surfaces of the coating to obtain the coating thickness data. If the thickness exceeds the specified range, the controller triggers the display and alarm functions. The hot stamping foil continues to be conveyed to the rear detection box 8 by the second horizontal high-position guide roller 7, and the thickness and uniformity are detected again. The hot stamping foil that has been tested is exported by the rear low-position guide roller 9. During this process, the height of the front / rear low-position guide roller 9 can be adjusted by the lifting device to change the tilt angle of the hot stamping foil and adapt to different testing requirements.

[0017] ③ Identification of coating surface defects

[0018] After thickness testing, the hot stamping foil enters the coating surface defect identification mechanism. The light source 10 located below the hot stamping foil illuminates its surface in parallel, and a transparent glass plate ensures uniform light coverage. The image acquisition device 11 is installed above the hot stamping foil and opposite to the light source 10 to acquire the back image formed after the light source 10 illuminates it in real time. The image data is directly transmitted to the adjacent defect detection unit. The unit compares the real-time image with the standard image to identify surface defects such as bubbles and pinholes, and records the specific location of the defects.

[0019] During the above-mentioned testing process, the device simultaneously integrates multi-dimensional data such as thickness uniformity and surface defects, and combines them with parameters such as temperature control of drying oven 4 and tension state of substrate traction. The data is fused and analyzed through intelligent algorithms. If problems such as excessive thickness or too many defects are found, the system provides real-time feedback to the production line, which facilitates timely adjustment of process parameters such as coating roller speed and drying temperature, thereby achieving closed-loop quality control throughout the entire process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the online detection device for the coating quality of electroplated aluminum hot stamping foil.

[0021] Figure 2 yes Figure 1 A schematic diagram showing the routing of electroplated aluminum hot stamping foil.

[0022] Figure 3 This is a schematic diagram of the internal structure of the pre-detection box.

[0023] Figure 4 This is a schematic diagram of the internal structure of the light source.

[0024] In the diagram: 1. Supporting wall panel; 1-1. Sliding groove; 2. Substrate guide roller; 3. Coating roller; 4. Drying oven; 5. Front low-position guide roller; 6. Front detection box; 6. Laser emitter; 6-1. Reflected light receiver; 6-2. Horizontal high-position guide roller; 7. Rear detection box; 8. Rear low-position guide roller; 9. Light source; 10. Box body; 10-1. Lighting assembly; 10-2. Image acquisition device; 11. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] refer to Figure 1-4 This online detection device for the coating quality of electroplated aluminum hot stamping foil is integrated into the coating production line. Along the direction of substrate travel, a coating mechanism, a coating thickness and uniformity detection mechanism, and a coating surface defect identification mechanism are set in sequence. Through the collaboration of multiple mechanisms, the entire process of online monitoring of coating quality is realized.

[0027] The core frame of the coating mechanism consists of two supporting wall panels 1 on both sides. A substrate guide roller 2 is rotatably mounted on the supporting wall panel 1, with the substrate guide roller 2 in contact with the coating roller 3. The lower part of the coating roller 3 is immersed in a container holding the coating liquid. The rotation of the roller evenly transfers the liquid to the substrate surface to form a coating. A drying chamber 4 is installed above, equipped with airflow regulation and temperature control components. By adjusting the airflow rate and temperature inside the chamber, rapid curing and drying of the coating are achieved.

[0028] After drying, the hot stamping foil is guided into the coating thickness and uniformity detection mechanism. Its path is formed by the front low-position guide roller 5, the front detection box 6, two horizontal high-position guide rollers 7, the rear detection box 8, and the rear low-position guide roller 9 in sequence. The rear ends of the front low-position guide roller 5 and the rear low-position guide roller 9 are both mounted on a back plate with a sliding groove 1-1. A lifting device is connected to the outside of the back plate. The lifting device drives the guide rollers to move up and down along the sliding groove 1-1, creating a height difference between the front low-position guide roller 5 and the horizontal high-position guide roller 7, and between the rear low-position guide roller 9 and the horizontal high-position guide roller 7. This pulls the hot stamping foil into an inclined state, adapting to different detection scenarios. The front detection box 6 is fixed directly above the first horizontal high-position guide roller 7. The box integrates a laser emitter 6-1, a reflected light receiver 6-2, and a controller. The laser emitted by the laser emitter 6-1 is perpendicularly irradiated onto the surface of the hot stamping foil coating. The reflected light receiver 6-2 synchronously receives the reflected signals from the upper and lower surfaces of the coating. The controller calculates the path difference between the two reflected light beams to obtain the coating thickness data. If the thickness exceeds the preset range, the controller triggers the external display module and alarm module to provide an abnormality prompt. The second horizontal high-position guide roller 7, the rear detection box 8, and the rear low-position guide roller 9 are symmetrically installed with the perpendicular line from the midpoint of the two horizontal high-position guide rollers 7 as the axis of symmetry. The detection components in the rear detection box 8 are completely identical to those in the front detection box 6, performing secondary thickness and uniformity detection on the hot stamping foil to improve data reliability.

[0029] The coating surface defect identification mechanism is located behind the thickness detection mechanism and mainly consists of a light source 10, an image acquisition device 11, and a defect detection unit. The light source 10 is positioned below the hot stamping foil between the second horizontal high-position guide roller 7 and the rear low-position guide roller 9, parallel to the hot stamping foil. The main body of the light source 10 is a sealed box 10-1, with a transparent glass plate covering the top surface. Several LED light modules are installed at the bottom inside the box, equidistantly arranged along the width of the hot stamping foil. Each module is equipped with an independent switch and brightness adjuster, allowing individual control of the light intensity in a specific area according to detection requirements. The image acquisition device 11 is installed above the hot stamping foil, opposite the position of the light source 10, with its lens facing the area illuminated by the light source 10, acquiring real-time transmitted images of the back of the hot stamping foil. The image acquisition device 11 is directly connected to the defect detection unit via a data cable. The defect detection unit has a built-in standard image database, comparing the real-time acquired images pixel-wise with the standard images to identify surface defects such as bubbles, pinholes, and scratches, and recording the specific location of the defects through coordinate positioning.

[0030] Workflow:

[0031] The substrate is pulled and conveyed to the coating area by the substrate guide roller 2. After the coating roller 3 applies the liquid to the surface of the substrate, the substrate is introduced into the drying oven 4, where the coating is dried by airflow regulation and temperature control.

[0032] After drying, the hot stamping foil enters the area of ​​the horizontal high-position guide roller 7 in an inclined state. The front detection box 6 and the rear detection box 8 measure the coating thickness respectively through the laser detection component, and trigger an alarm when there is an abnormality.

[0033] After the hot stamping foil enters the defect detection area, the light source 10 illuminates the coating surface evenly through the transparent glass plate, and the image acquisition device 11 acquires the back image and transmits it to the defect detection unit to complete defect identification and location.

[0034] Throughout the entire inspection process, the controller integrates thickness data, defect data, and drying oven temperature data in real time. It analyzes and judges the coating quality through intelligent algorithms. If any abnormality occurs, it feeds back to the production line control system to realize real-time adjustment of process parameters and form a closed-loop quality control.

[0035] This utility model achieves independent operation and coordinated linkage of various testing functions through modular design, upgrading from single-index testing to full-process quality control, which greatly improves the production quality and efficiency of electroplated aluminum hot stamping foil.

Claims

1. An online inspection device for the coating quality of electroplated aluminum hot stamping foil, installed on an electroplated aluminum hot stamping foil coating production line, characterized in that: This includes coating mechanisms, coating thickness and uniformity testing mechanisms, and coating surface defect identification mechanisms; The coating mechanism includes two supporting wall panels (1), a substrate guide roller (2), and a coating roller (3) that is attached to the substrate guide roller (2). The lower part of the coating roller (3) is immersed in the coating liquid. A drying box (4) is set above the coating roller (3), and a corresponding mechanism for airflow regulation and temperature control is set inside it. The coating thickness and uniformity detection mechanism includes a front low-position guide roller (5), a front detection box (6), two horizontal high-position guide rollers (7) set at the same height, a rear detection box (8), and a rear low-position guide roller (9); wherein, the vertical height of the front low-position guide roller (5) and the rear low-position guide roller (9) is less than or equal to the vertical height of the horizontal high-position guide roller (7); the front detection box (6) covers the first horizontal high-position guide roller (7), and a laser emitter (6-1), a reflected light receiver (6-2), and a controller are provided inside the front detection box (6), and the controller is connected to a display and an alarm; in addition, with the vertical line between the midpoints of the two horizontal high-position guide rollers (7) set at the same height as the axis of symmetry, the second horizontal high-position guide roller (7), the rear detection box (8), and the rear low-position guide roller (9) are symmetrically installed; Behind the coating thickness and uniformity detection mechanism, a coating surface defect identification mechanism is provided, including a light source (10) and an image acquisition device (11); the light source (10) is located between the second horizontal high guide roller (7) and the rear low guide roller (9), and is located below the hot stamping foil, with the light source (10) and the hot stamping foil arranged parallel to each other; The image acquisition device (11) is installed on the other side of the hot stamping foil opposite to the position of the light source (10) to acquire the image formed on its back after being irradiated by the light source (10); a defect detection unit is set up next to the image acquisition device (11), and the two are directly connected.

2. The online detection device for the coating quality of electroplated aluminum hot stamping foil according to claim 1, characterized in that, The rear ends of the front low-position guide roller (5) and the rear low-position guide roller (9) are mounted on the support wall plate (1) with the sliding groove (1-1), and their heights are adjusted by the lifting device connected to their rear ends, thereby changing the travel angle of the hot stamping foil passing over the roller surface of the front low-position guide roller (5) and the rear low-position guide roller (9); the maximum height of the front low-position guide roller (5) and the rear low-position guide roller (9) is flush with the horizontal high-position guide roller (7), and the angle adjustment range of the hot stamping foil is between 0° and 60°.

3. The online detection device for the coating quality of electroplated aluminum hot stamping foil according to claim 1, characterized in that, The light source (10) includes a housing (10-1) and a lighting assembly (10-2); a transparent glass plate is installed on the top surface of the housing (10-1), and the lighting assembly (10-2) is installed on the bottom inside the housing (10-1), including several LED light modules, which are arranged at equal intervals and controlled by an independent switch to adjust the switching and brightness of the LED light modules.

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