Full-automatic double-coating hot melt adhesive coating machine

Abstract

The invention discloses a full-automatic double-coating hot melt adhesive coating machine. The coating machine is sequentially provided with a front unwinding unit, a corona unit, a deviation rectifying unit, a double-coating composite host, a winding unit and a rear unwinding unit along the direction of a production line. The double-coating composite host adopts a satellite type layout and comprises two groups of independent coating systems, and each group of system is provided with a coating roller, a composite roller and the like, so that simultaneous coating in forward and reverse directions can be realized. The front unwinding unit and the rear unwinding unit can be provided with a plurality of unwinding rollers, multi-layer or side-by-side layout unwinding is achieved, and products can be conveniently and rapidly converted. And the equipment is provided with a high-precision encoder and a laser range finder, so that accurate coating positioning is realized. Meanwhile, the glue box is provided with an ultrasonic liquid level sensor and an automatic glue supplementing system, and the winding unit adopts a constant-tension taper control algorithm, so that stable glue supply and winding quality are guaranteed. The coating machine solves the problems that a traditional coating machine is single in coating mode, poor in production flexibility and the like, is widely suitable for the industries of labels, electronic materials, medical treatment and the like, and effectively improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coating equipment, and particularly to a fully automatic double-coating hot melt adhesive coater. Background Art

[0002] In industrial production, hot melt adhesive coating technology is widely used in multiple fields such as labels, packaging, electronics, and medical, to achieve functions such as material lamination and bonding, and improve product performance and quality. With the continuous change and upgrade of market demands, traditional coating equipment has gradually exposed many limitations, mainly reflected in the following aspects: Single coating method: Most traditional coaters can only perform single-sided coating. In some scenarios where double-sided coating of products is required, two devices need to operate separately, which not only occupies a large amount of production space but also makes the production process cumbersome and inefficient. For example, in the production of self-adhesive labels, traditional equipment can only complete one-sided coating first and then turn over for coating, which adds links such as handling and positioning, resulting in an extended production cycle and increased labor costs.

[0003] Poor production flexibility: It is difficult to quickly adapt to the production requirements of different products. The coating process parameters of different products, such as the amount of glue, coating speed, coating temperature, etc., vary greatly. When traditional equipment switches products, it often takes a lot of time for equipment debugging and parameter setting, and cannot meet the production trend of multi-variety and small-batch in modern manufacturing. This causes a significant decline in production efficiency when enterprises face diverse orders, making it difficult to quickly respond to market changes and missing business opportunities.

[0004] Low coating accuracy: During high-speed production, it is difficult to guarantee the coating accuracy of traditional coating equipment. The coating position deviation is large, and the uniformity of the glue layer thickness is poor. For some industries with extremely high requirements for coating accuracy, such as the manufacturing of electronic materials, it will seriously affect product quality and performance. For example, in the manufacturing of flexible circuit boards, if the coating accuracy is insufficient, it may lead to circuit short circuits or open circuits, reducing the product qualification rate and increasing production costs.

[0005] Low degree of automation: It relies on a large amount of manual operation. From the loading of the base material, the adjustment of equipment parameters to the winding of the finished product, manual participation is required, which not only increases labor costs but also easily causes production errors and quality problems due to human factors. At the same time, manual operation is difficult to achieve real-time monitoring and precise control of the production process, and cannot meet the development requirements of modern industrial automation and intelligence.

[0006] To solve these problems, there is an urgent need in the market for a new type of coating equipment that can achieve double coating or multi - coating functions, and has characteristics such as high production efficiency, high flexibility, high precision, and high automation. This fully automatic double - coating hot - melt adhesive coater is developed based on such market demands and industry pain points, aiming to improve the application level of hot - melt adhesive coating technology and provide strong support for the development of related industries. Summary of the Invention

[0007] Based on the above - mentioned purpose, the present invention provides a fully automatic double - coating hot - melt adhesive coater: It includes a front unwinding unit, a corona unit, a deviation rectification unit, a double - coating composite main machine, a winding unit, and a rear unwinding unit arranged in sequence along the production line direction; the double - coating composite main machine is located in the middle of the production line, the front unwinding unit and the rear unwinding unit are located at the front end and the rear end of the production line respectively. The front unwinding unit and the rear unwinding unit are used to release the substrate coil materials to be coated. The double - coating composite main machine contains two independent coating systems. Each coating system includes a coating roller, a composite roller, a mirror - finished steel roller, and a cooling roller. The coating roller is used to evenly coat the hot - melt adhesive on the surface of the substrate. The composite roller is used to bond different layers of the substrate or the coated layers. The mirror - finished steel roller assists in pressing the coated layer. The cooling roller is used to quickly solidify the coated hot - melt adhesive. The two coating systems cooperate to achieve simultaneous forward and reverse coating of the substrate. The double - coating composite main machine adopts a satellite layout. Each coating roller, composite roller, mirror - finished steel roller, and cooling roller are symmetrically distributed with the central steel roller as the reference, and are equipped with high - precision encoders and laser rangefinders. The high - precision encoders are used to accurately measure the rotation position and speed of each roller, and the laser rangefinders are used to real - time monitor the coating position. Inside the double - coating composite main machine, there is also a coater that cooperates with the coating roller.

[0008] Further, the front unwinding unit and the rear unwinding unit can be provided with multiple unwinding rollers, and through the combination of multiple unwinding rollers, the unwinding method of multi - layer or side - by - side layout can be achieved.

[0009] Further, the coater also includes a glue tank, and the glue tank is configured with an ultrasonic liquid level sensor and an automatic glue replenishment system. The ultrasonic liquid level sensor is used to real - time monitor the liquid level of the hot - melt adhesive in the glue tank. When the liquid level is lower than the set value, the automatic glue replenishment system is started to provide continuous and stable hot - melt adhesive supply for the coating system.

[0010] Further, the winding unit adopts a constant - tension taper control algorithm, and is configured with a winding roller and a tension control system. The tension control system adjusts the winding force in real - time according to the constant - tension taper control algorithm.

[0011] Further, the deviation rectification unit uses a high - precision sensor to real - time monitor the substrate deviation. The high - precision sensor can accurately detect the lateral position deviation of the substrate during transportation. After detecting the deviation, the servo drive mechanism dynamically adjusts the substrate path to keep the substrate on the correct transportation track.

[0012] Furthermore, the corona unit is provided with a corona treatment device which generates high-voltage corona to pre-treat the surface of the passing substrate, changing the physical and chemical properties of the substrate surface.

[0013] Furthermore, the coater integrates a PLC + touch screen control terminal. The PLC is used for logical control and data processing of the operation of each unit, and the touch screen control terminal is used for the operator to monitor the operation parameters of each station in real time, including tension, temperature, and speed, and supports digital presetting and dynamic adjustment of coating parameters.

[0014] Furthermore, the cooling system adopts a closed-loop temperature control technology. The closed-loop temperature control technology monitors the substrate temperature in real time through a temperature sensor and dynamically adjusts the refrigerant flow according to the monitored temperature.

[0015] Advantages of the present invention: The front and back side synchronous coating design enables the production capacity of a single device to be equivalent to that of two traditional single-coating machines, with an 80% increase in production efficiency; the double-coating system driven independently by servo motors can switch coating modes (such as single / double-sided, different adhesive types) through the human-machine interface, and the preset parameters are automatically called, shortening the product changeover time to within 15 minutes; the satellite layout supports the expansion of front / rear unwind units (up to 3 groups), enabling coating of substrates stacked with more than 3 layers, meeting the requirements of complex products such as electronic materials and medical dressings; the cooling system adopts a closed-loop temperature control technology, dynamically adjusting the refrigerant flow according to the substrate temperature, saving 35% energy compared with traditional models. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic cross-sectional view of the internal structure of an embodiment of the present invention; Figure 3 It is a schematic diagram of the internal structure of the double-coating composite main machine of an embodiment of the present invention.

[0018] In the figure: 1, front unwind unit; 2, corona unit; 3, deviation rectification unit; 4, double-coating composite main machine; 5, winding unit; 6, coater; 7, coating roller; 8, composite roller; 9, mirror steel roller; 10, cooling roller; 11, glue tank; 12, rear unwind unit. Detailed Embodiments

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0020] It should be noted that in the specification, references to "one embodiment", "an embodiment", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when describing a specific feature, structure, or characteristic in connection with an embodiment, implementing such feature, structure, or characteristic in connection with other embodiments (whether or not explicitly described) should be within the knowledge of those skilled in the relevant art.

[0021] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, at least in part depending on the context, can allow for the existence of other factors that may not be explicitly described.

[0022] Refer to Figures 1 to 3 as shown Overall layout of the equipment The present invention adopts a modular satellite layout, which is sequentially arranged along the production line direction as follows: Front unwind unit 1: Configured with a Ø1000mm unwind roller to carry the base material coil and support the supply of glue from the maximum 600kg glue tank 11. Corona unit 2: Equipped with a corona treatment device to pre-treat the surface of the base material to enhance the coating adhesion. Edge correction unit 3: Uses high-precision sensors to monitor the deviation of the base material in real time and dynamically adjusts it through a servo drive mechanism. Dual coating composite main machine 4: The core module, which includes two independent coating systems. Each group is configured with a coating roller 7, a composite roller 8, a mirror steel roller 9, and a cooling roller 10 to achieve double-sided synchronous coating. Rear unwind unit 12: Symmetrically arranged with the front unwind unit to support the reverse input of the base material. Rewind unit 5: Configured with a 2150mm rewind roller and integrated with a tension control system to ensure the flatness of the finished coil material.

[0023] Implementation of the dual coating system Forward coating: The base material from the front unwind 1 enters the double coating main machine 4 after corona treatment 2 and deviation correction 3. The gluing system evenly coats the hot melt adhesive on the front side of the base material through a metering roller, and after being pressed by a mirror steel roller 9, it is cured by a cooling roller (10).

[0024] Reverse coating: The base material from the rear unwind 12 is synchronously input into the double coating main machine 4. The lower gluing system completes the coating on the back side of the base material using the same process, and double-sided lamination is achieved through a compounding roller 8.

[0025] Quick product changeover: The double coating system uses independent servo drives, can switch the coating mode through a human-machine interface, supports digital presetting of coating parameters (such as glue volume, temperature), and the product changeover time is shortened to within 15 minutes.

[0026] Satellite positioning technology The double coating main machine 4 adopts a multi-roller synchronous satellite structure, and each functional roller (coating, compounding, cooling) is symmetrically distributed with the central steel roller as the reference, ensuring the accurate and stable path of the base material; Equipped with high-precision encoders and laser rangefinders to achieve a positioning accuracy of ±0.1 mm for the coating position; The satellite layout supports multi-layer base material stacking coating, and through the expansion of the unwind units (2 - 3 groups in the front / back), the production of composite products with more than 3 layers can be achieved.

[0027] Intelligent control system Integrated PLC + touch screen control terminal, real-time monitoring of the operating parameters of each station (tension, temperature, speed); The glue tank 11 is equipped with an ultrasonic liquid level sensor and an automatic glue replenishment system to ensure continuous glue supply; The rewinding unit 5 adopts a constant tension taper control algorithm to avoid wrinkling or loose winding of the rolled material.

[0028] Working principle: Base material input and pre-treatment The front unwind unit 1 releases the base material roll, and conveys it to the corona unit 2 through a Ø1000 mm unwind roller for corona treatment of the base material surface to enhance surface activity and improve the adhesion of the glue.

[0029] The deviation correction unit 3 monitors the deviation of the base material in real time and dynamically adjusts it through a servo mechanism to ensure that the base material enters the coating area along an accurate path.

[0030] Double coating and compounding process Forward coating: The pre-treated base material enters the double coating and compounding main machine 4. The upper coating system evenly coats the hot melt adhesive on the front side of the base material through a metering roller, and after being pressed by a mirror steel roller 9, it is quickly cured by a cooling roller 10.

[0031] Reverse coating: Synchronously, the substrate released by the rear unwind unit 12 enters the main machine from below. The lower coating system coats the back of the substrate, and it is laminated with the front-coated substrate through the laminating roller 8 to form a double-sided composite structure.

[0032] Satellite-type precise positioning The double-coating main machine adopts a multi-roller synchronous satellite structure. With the central steel roller as the reference, each functional roller (coating, laminating, cooling) is symmetrically distributed to ensure a stable substrate path without deviation.

[0033] The high-precision encoder and laser rangefinder calibrate the coating position in real time to achieve a positioning accuracy of ±0.1 mm.

[0034] Intelligent control and tension management The PLC + touch screen system monitors the parameters of each station (tension, temperature, speed) in real time and supports digital presetting and dynamic adjustment.

[0035] The glue tank 11 automatically replenishes glue through an ultrasonic liquid level sensor to ensure continuous glue supply; the winding unit 5 adopts a constant tension taper control algorithm to avoid coil deformation.

[0036] This invention covers any substitutions, modifications, equivalent methods, and solutions made within the essence and scope of this invention. To enable the public to have a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments of this invention. However, those skilled in the art can fully understand this invention even without the description of these details. Additionally, to avoid unnecessary confusion to the essence of this invention, well-known methods, processes, flows, components, and circuits are not described in detail.

[0037] The above are only the preferred embodiments of this invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of this invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this invention.

Claims

1. A fully automatic double-coating hot melt adhesive coating machine, characterized in that: The invention comprises a front unwinding unit (1), a corona unit (2), a deviation correction unit (3), a double coating composite main machine (4), a winding unit (5) and a rear unwinding unit (12) which are arranged in sequence along the direction of the production line; the double coating composite main machine (4) is located in the middle of the production line; the front unwinding unit (1) and the rear unwinding unit (12) are located at the front end and the rear end of the production line respectively; the front unwinding unit (1) and the rear unwinding unit (12) are used to release the substrate coil to be coated; the double coating composite main machine (4) comprises two sets of independent coating systems, each set of coating systems comprises a coating roller (7), a composite roller (8), a mirror steel roller (9) and a cooling roller (10); the coating roller (7) is used to evenly coat the hot melt adhesive on the surface of the substrate; the composite roller (8) is used to evenly coat the hot melt adhesive on the surface of the substrate; the composite roller (9) is used to evenly coat the hot melt adhesive on the surface of the substrate; the composite roller (10) is used to evenly coat the hot melt adhesive on the surface of the substrate; the composite roller (10) is used to evenly coat the hot melt adhesive on the surface of the substrate; the composite roller (10) is used to evenly coat the hot melt adhesive on the surface of the substrate. The combining roller (8) is used to make different layers of substrates or coated layers adhere to each other, the mirror steel roller (9) assists in pressing the coating layer, and the cooling roller (10) is used to quickly solidify the coated hot melt adhesive. The two sets of coating systems cooperate to achieve simultaneous coating of the substrate in the forward and reverse directions. The double-coating composite main machine (4) adopts a satellite layout. Each coating roller (7), composite roller (8), mirror steel roller (9) and cooling roller (10) are symmetrically distributed with the central steel roller as the reference, and are equipped with a high-precision encoder and a laser rangefinder. The high-precision encoder is used to accurately measure the rotation position and speed of each roller, and the laser rangefinder is used to monitor the coating position in real time. The double-coating composite main machine (4) is also provided with a coating machine (6) that cooperates with the coating roller (7).

2. The fully automatic double-coating hot melt adhesive coating machine according to claim 1 is characterized in that: The front unwinding unit (1) and the rear unwinding unit (12) may be provided with a plurality of unwinding rollers, and a multi-layer or side-by-side unwinding method may be realized through the combination of the plurality of unwinding rollers.

3. The fully automatic double-coating hot melt adhesive coating machine according to claim 1 is characterized in that: The system also includes a glue box (11), wherein the glue box (11) is equipped with an ultrasonic liquid level sensor and an automatic glue replenishing system. The ultrasonic liquid level sensor is used to monitor the liquid level of the hot melt glue in the glue box (11) in real time. When the liquid level is lower than a set value, the automatic glue replenishing system is activated to provide a continuous and stable supply of hot melt glue to the coating system.

4. The fully automatic double-coating hot melt adhesive coating machine according to claim 1, characterized in that: The winding unit (5) adopts a constant tension taper control algorithm and is equipped with a winding roller and a tension control system. The tension control system adjusts the winding force in real time according to the constant tension taper control algorithm.

5. The fully automatic double-coating hot melt adhesive coating machine according to claim 1, characterized in that: The deviation correction unit (3) uses a high-precision sensor to monitor the deviation of the substrate in real time. The high-precision sensor can accurately detect the lateral position deviation of the substrate during the conveying process. After the deviation is detected, the substrate path is dynamically adjusted through the servo drive mechanism to keep the substrate on the correct conveying track.

6. The fully automatic double-coating hot melt adhesive coating machine according to claim 1, characterized in that: The corona machine unit (2) is provided with a corona treatment device, which generates high-voltage corona to pre-treat the surface of the substrate passing through, thereby changing the physical and chemical properties of the substrate surface.

7. The fully automatic double-coating hot melt adhesive coating machine according to any one of claims 1 to 6, characterized in that: The coating machine integrates PLC + touch screen control terminal. PLC is used for logical control and data processing of the operation of each unit. The touch screen control terminal is used for operators to monitor the operating parameters of each workstation in real time, including tension, temperature, speed, and supports digital preset and dynamic adjustment of coating parameters.

8. The fully automatic double-coating hot melt adhesive coating machine according to claim 7, characterized in that: The cooling system adopts a closed-loop temperature control technology, which monitors the substrate temperature in real time through a temperature sensor and dynamically adjusts the refrigerant flow rate according to the monitored temperature.

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