Monitoring device for center line glue of filter stick

Abstract

The monitoring device comprises an industrial personal computer, a forming paper preheater, a glue spraying nozzle and a thermal imager, wherein the forming paper preheater, the glue spraying nozzle and the thermal imager are sequentially arranged in the conveying direction of forming paper. And the thermal imager is connected with the industrial personal computer. Compared with the prior art, the molding paper is preheated before glue spraying, so that a large temperature difference is formed between the middle line glue sprayed on the molding paper and the preheated molding paper, the middle line glue is highlighted in a developing image of a thermal imager, the monitoring accuracy is improved, and meanwhile, adverse effects caused by error detection can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of filter rod production, and more specifically, to a monitoring device for filter rod midline glue. Background Art

[0002] During filter rod production, centerline glue is a key auxiliary material, bonding the forming paper to the diacetate tow and preventing shrinkage and tow movement. Currently, water-based latex is the primary glue used in filter rod centerline glue, applied using either linear or spiral spraying. Centerline glue monitoring primarily involves capacitance monitoring (included in the original machine) and visual monitoring (developed by a third party).

[0003] Capacitance monitoring measures the capacitance of capacitors in a circuit. The presence or absence of centerline glue on the forming paper causes subtle changes in capacitance. This change is detected through an amplification circuit. If the capacitance falls below a specified value, a warning is issued or the machine is directly shut down by program control. This monitoring method is applicable to both linear and spiral spraying machines.

[0004] However, after a long period of production, it was discovered that the capacitance monitoring system was too sensitive, requiring high standards for centerline glue application. Even the slightest fluctuation would trigger a program-controlled shutdown, causing frequent equipment starts and stops, resulting in significant waste. Currently, production processes either shield the sensor or lower the lower limit to avoid frequent shutdowns, which means that capacitance-based centerline glue monitoring is no longer effective.

[0005] Visual monitoring was developed by a third party in recent years and introduced to filter rod production lines. As we all know, visual monitoring uses industrial cameras to collect product appearance parameters such as color, shape, size, and position, and then compares them with preset samples to perform differentiation and identification.

[0006] Because the centerline glue is pure white, using a water-based latex, and the build paper is also pure white, they cannot be distinguished by color. Visual monitoring relies on the fact that linearly sprayed centerline glue forms a long, straight line (single or double) on the build paper. This line has a certain thickness, and when illuminated from the side, a thin black shadow appears. This shadow can be captured by an industrial camera, creating a perfect contrast with the white build paper. If the black line breaks or disappears, it can be determined that the centerline glue is missing.

[0007] However, many current filter rod forming machines utilize a spiral glue nozzle, which uses a high-pressure airflow to apply the centerline glue onto the forming paper in a spiral pattern. This glue application method produces a wider glue line, resulting in a better bond between the tow and the forming paper. However, the centerline glue applied by the spiral glue spray is very thin due to the high-pressure airflow, and does not cast a shadow under bright conditions. Conventional visual inspection methods cannot detect the presence of the glue line.

[0008] In summary, existing technical means are unable to effectively monitor the presence of centerline glue while avoiding frequent shutdowns of production activities caused by misdetection. Utility Model Content

[0009] The present application provides a monitoring device for the centerline glue of a filter rod, which preheats the forming paper before spraying the glue, so that a large temperature difference is formed between the centerline glue sprayed on the forming paper and the preheated forming paper, so that the centerline glue stands out in the development image of the thermal imager, thereby improving the accuracy of monitoring and avoiding the adverse effects caused by misdetection.

[0010] The present application provides a monitoring device for the glue in the center of a filter rod, comprising an industrial computer, a forming paper preheater, a glue spray nozzle and a thermal imager arranged in sequence along the conveying direction of the forming paper; the thermal imager is connected to the industrial computer.

[0011] Preferably, a cooling element is provided on the glue spray nozzle.

[0012] Preferably, a paper guide is provided at a position on the conveying path of the shaping paper corresponding to the glue spraying nozzle.

[0013] Preferably, a forming paper preheating roller is provided between the forming paper preheater and the paper guide plate.

[0014] Preferably, a hot melt glue gun and a wrapping paper heating plate are sequentially provided downstream of the thermal imager on the conveying path of the wrapping paper.

[0015] Preferably, the thermal imager is an infrared imager.

[0016] The present application also provides a method for monitoring the glue in the filter rod, comprising:

[0017] Preheating the plug wrap upstream of the glue nozzle;

[0018] Use the glue spray nozzle to spray the center line glue on the forming paper;

[0019] The surface temperature of the forming paper coated with centerline glue is detected by a thermal imager to obtain a development map;

[0020] The centerline glue spraying area is identified in the developing image using an industrial computer to determine whether there is centerline glue on the forming paper and the spraying status of the centerline glue.

[0021] Preferably, the plug wrapping paper is preheated by a plug wrapping paper preheater upstream of the glue spraying nozzle.

[0022] Preferably, the plugging paper is preheated by a plugging paper preheater and a plugging paper preheating roller upstream of the glue spraying nozzle.

[0023] Preferably, a cooling element is provided on the glue spray nozzle.

[0024] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0026] Figure 1 This is a schematic diagram of the structure of the monitoring device for the filter rod midline glue provided by this application;

[0027] Figure 2 Thermal imager development image obtained by the spiral glue spraying method provided in this application;

[0028] Figure 3 This is the thermal imager development image obtained by the linear spraying method provided in this application. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] The present application provides a monitoring device for the centerline glue of a filter rod, which preheats the forming paper before spraying the glue, so that a large temperature difference is formed between the centerline glue sprayed on the forming paper and the preheated forming paper, so that the centerline glue stands out in the development image of the thermal imager, thereby improving the accuracy of monitoring and avoiding the adverse effects caused by misdetection.

[0034] like Figure 1 As shown, the monitoring device for the filter rod centerline glue provided in the present application includes an industrial computer (not shown in the figure), a forming paper preheater 9, a glue nozzle 4 and a thermal imager 3 arranged on the frame 1 in sequence along the conveying direction of the forming paper 8.

[0035] like Figure 1As shown, a paper guide 7 is provided at a position corresponding to the glue spraying nozzle 4 on the conveying path of the shaping paper 8, for providing support for the shaping paper 8 and improving the adhesion of the center line glue.

[0036] The thermal imager 3 is used to perform thermal imaging on the forming paper sprayed with the center line glue to form a development image. Figure 2 The image shows the development obtained after the glue nozzle 4 sprays the center line glue in a spiral glue spraying manner, wherein the hotter forming paper 21 appears red, and the cooler glue line 22 appears bluish-black. Figure 3 The development image obtained after the glue nozzle 4 sprays the center line glue in a linear spraying manner is shown, wherein the hotter forming paper 31 appears red, and the cooler glue line 32 appears bluish-black.

[0037] As an embodiment, the thermal imager 3 is an infrared imager, which has a high sensitivity to temperature, so that the contrast between the forming paper and the center line glue in the development image is higher.

[0038] like Figure 1 As shown, a hot melt glue gun 2 and a wrapping paper heating plate 5 are located downstream of the thermal imager 3 on the conveying path of the wrapping paper 8. A paper guide rod 6 is located at a position corresponding to the hot melt glue gun 2 to provide guidance and support for the wrapping paper. The wrapping paper heating plate 5 heats the wrapping paper, increasing the heat of the centerline glue and the viscosity of the melt glue, ensuring that the wrapping paper is well bonded to the tow through the centerline glue and that the ends of the wrapping paper are also well bonded together through the hot melt glue.

[0039] Preferably, if Figure 1 As shown, the glue spray nozzle 4 is provided with a cooling element, which reduces the temperature of the center glue, thereby increasing the temperature difference between the preheated forming paper and the center glue, making the development image of the thermal imager more obvious.

[0040] Preferably, if Figure 1 As shown, a wrapping paper preheating roller 10 is provided between the wrapping paper preheater 9 and the paper guide 7. The wrapping paper preheating roller 10 further preheats the wrapping paper on the one hand, and provides steering guidance for the wrapping paper on the other hand, thereby reducing the space occupied by the monitoring device.

[0041] The thermal imager 3 is connected to an industrial computer. The industrial computer is used to receive the development image from the thermal imager 3 and identify the glue line in the development image by color comparison, thereby determining whether there is center line glue and the spraying status of the center line glue.

[0042] Based on the above, the present application also provides a method for monitoring the glue in the filter rod, comprising:

[0043] P1: Preheating of the plug wrap upstream of the glue nozzle.

[0044] As an embodiment, the plugging paper is preheated by a plugging paper preheater upstream of the glue spraying nozzle.

[0045] Preferably, the plugging paper is preheated by a plugging paper preheater and a plugging paper preheating roller upstream of the glue spraying nozzle.

[0046] P2: Use the glue spray nozzle to spray the center line glue onto the forming paper.

[0047] As an embodiment, the glue spraying nozzle adopts a spiral glue spraying method.

[0048] As another embodiment, the glue spraying nozzle adopts a linear spraying method.

[0049] Preferably, a cooling element is provided on the glue spray nozzle.

[0050] P3: Use a thermal imager to detect the surface temperature of the forming paper coated with center line glue and obtain a development map.

[0051] P4: Use an industrial computer to identify the centerline glue spraying area in the developer image, determine whether the centerline glue exists on the forming paper, and determine the centerline glue spraying status (for example, whether it is interrupted). It should be noted that the centerline glue spraying area is identified using existing technology, and this application does not provide any technical improvements.

[0052] The present application solves the problem of difficult and inaccurate monitoring of centerline glue during filter rod production.

[0053] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A monitoring device for filter rod midline glue, characterized in that: The invention comprises an industrial computer, a shaping paper preheater, a glue spraying nozzle and a thermal imager which are sequentially arranged along the conveying direction of the shaping paper; the thermal imager is connected to the industrial computer.

2. The monitoring device for the filter rod midline glue according to claim 1, characterized in that: The glue spraying nozzle is provided with a refrigeration element.

3. The monitoring device for filter rod midline glue according to claim 1 or 2, characterized in that: A paper guide is provided at a position on the conveying path of the shaping paper corresponding to the glue spraying nozzle.

4. The monitoring device for the filter rod midline glue according to claim 3, characterized in that: A shaping paper preheating roller is provided between the shaping paper preheater and the paper guide plate.

5. The monitoring device for filter rod midline glue according to claim 1 or 4, characterized in that: On the conveying path of the forming paper, a hot melt glue gun and a forming paper heating plate are sequentially provided downstream of the thermal imager.

6. The monitoring device for filter rod midline glue according to claim 1, characterized in that: The thermal imager is an infrared imager.

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