A fully automatic double-coating hot melt adhesive coating machine

Abstract

The utility model discloses a full -automatic double -coated hot melt adhesive coating machine. The coating machine sets up in proper order front unwinding unit group, corona unit group, rectification unit group, double -coated composite host computer, winding unit group and rear unwinding unit group along the production line direction. Double -coated composite host computer adopts satellite type layout, contains two groups of independent coating system, and each group of system is equipped with coating roll, composite roll etc.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and in particular to a fully automatic double-coat hot melt adhesive coating machine. Background Technology

[0002] In industrial production, hot melt adhesive coating technology is widely used in labeling, packaging, electronics, medical and other fields to achieve functions such as material lamination and bonding, thereby improving product performance and quality. However, with the continuous changes and upgrades in market demands, traditional coating equipment has gradually revealed many limitations, mainly in the following aspects:

[0003] Limited coating methods: Traditional coating machines can mostly only perform single-sided coating. In scenarios where coating is required on both sides of a product, two machines are needed to operate separately. This not only occupies a lot 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 the coating on one side first and then flip it over for coating on the other side. This process adds handling and positioning steps, resulting in a longer production cycle and increased labor costs.

[0004] Poor production flexibility: Difficulty in quickly adapting to the production needs of different products. Coating process parameters, such as adhesive dosage, coating speed, and coating temperature, vary significantly between products. Traditional equipment often requires considerable time for equipment debugging and parameter settings when switching products, failing to meet the modern manufacturing trend of multi-variety, small-batch production. This results in a significant drop in production efficiency when facing diversified orders, making it difficult to respond quickly to market changes and causing missed business opportunities.

[0005] Low coating precision: In high-speed production processes, traditional coating equipment struggles to guarantee coating precision. Significant deviations in coating position and poor uniformity of adhesive layer thickness can severely impact product quality and performance, especially in industries with extremely high precision requirements, such as electronic materials manufacturing. For instance, in the manufacture of flexible circuit boards, insufficient coating precision can lead to short circuits or open circuits, reducing product yield and increasing production costs.

[0006] Low level of automation: It relies heavily on manual operation. From feeding the substrate and adjusting the equipment parameters to winding the finished product, all require human intervention. This not only increases labor costs but also easily leads to production errors and quality problems due to human factors. At the same time, manual operation makes it difficult to achieve real-time monitoring and precise control of the production process, which cannot meet the development requirements of modern industrial automation and intelligence.

[0007] To address these issues, the market urgently needs a new type of coating equipment capable of dual- or multi-coating functions, possessing high production efficiency, high flexibility, high precision, and a high degree of automation. This fully automatic dual-coat hot melt adhesive coating machine was 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. Utility Model Content

[0008] To achieve the above objectives, this utility model provides a fully automatic double-coat hot melt adhesive applicator:

[0009] The system includes, sequentially arranged along the production line, a front unwinding unit, a corona treatment unit, a web guiding unit, a dual-coating laminating machine, a winding unit, and a rear unwinding unit. The dual-coating laminating machine is located in the middle of the production line, while the front and rear unwinding units are located at the front and rear ends, respectively. The front and rear unwinding units release the substrate rolls to be coated. The dual-coating laminating machine comprises two independent coating systems, each including a coating roller, a laminating roller, a mirror steel roller, and a cooling roller. The coating roller is used to uniformly coat the hot melt adhesive onto the substrate surface, and the laminating roller is used to coat different layers of the substrate. The coating layers may already be bonded together, with mirror steel rollers assisting in pressing the coating layers together. Cooling rollers are used to quickly cure the hot melt adhesive in the coating. The two coating systems work together to achieve simultaneous coating on the front and back of the substrate. The dual-coating composite host adopts a satellite layout, with each coating roller, composite roller, mirror steel roller, and cooling roller symmetrically distributed around the central steel roller. It is 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 dual-coating composite host also has a coating machine inside that works in conjunction with the coating rollers.

[0010] Furthermore, the front unwinding unit and the rear unwinding unit can be equipped with multiple unwinding rollers, and the combination of multiple unwinding rollers can realize multi-layer or side-by-side unwinding methods.

[0011] Furthermore, the coating machine also includes a glue tank, which is equipped with an ultrasonic liquid level sensor and an automatic glue replenishment system. The ultrasonic liquid level sensor is used to monitor the liquid level of hot melt adhesive in the glue tank in real time. When the liquid level is lower than the set value, the automatic glue replenishment system is activated to provide a continuous and stable supply of hot melt adhesive to the coating system.

[0012] Furthermore, the winding unit 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.

[0013] Furthermore, the alignment unit uses high-precision sensors to monitor substrate offset in real time. The high-precision sensors can accurately detect the lateral position deviation of the substrate during the conveying process. After the offset is detected, the substrate path is dynamically adjusted through the servo drive mechanism to keep the substrate on the correct conveying track.

[0014] Furthermore, the corona treatment unit is equipped with a corona treatment device, which generates high-voltage corona to pretreat the surface of the substrate, thereby changing the physical and chemical properties of the substrate surface.

[0015] Furthermore, the coating machine integrates a PLC and a touch screen control terminal. The PLC is used for logic control and data processing of the operation of each unit, while the touch screen control terminal is used by operators to monitor the operating parameters of each station in real time, including tension, temperature, and speed, and supports digital preset and dynamic adjustment of coating parameters.

[0016] Furthermore, the cooling system adopts closed-loop temperature control technology, which monitors the substrate temperature in real time through temperature sensors and dynamically adjusts the refrigerant flow rate based on the monitored temperature.

[0017] The beneficial effects of this utility model are:

[0018] The simultaneous front and back coating design enables a single machine to produce the equivalent of two traditional single-coating machines, increasing production efficiency by 80%. The independent servo-driven dual coating system allows for switching coating modes (such as single / double-sided, different adhesive types) via a human-machine interface, with preset parameters automatically recalled, reducing changeover time to within 15 minutes. The satellite layout supports the expansion of front / rear unwinding units (up to 3 units), enabling coating of more than 3 layers of substrates, adapting to the needs of complex products such as electronic materials and medical dressings. The cooling system adopts closed-loop temperature control technology, dynamically adjusting the refrigerant flow according to the substrate temperature, resulting in 35% energy savings compared to traditional models. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of the internal structure of an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the dual-coating composite host according to an embodiment of the present invention.

[0023] In the diagram: 1. Front unwinding unit; 2. Corona generator unit; 3. Tracking unit; 4. Double coating composite main unit; 5. Rewinding unit; 6. Coating machine; 7. Coating roller; 8. Composite roller; 9. Mirror steel roller; 10. Cooling roller; 11. Glue box; 12. Rear unwinding unit. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments. For some known technologies, those skilled in the art can also use other alternative methods to implement the invention. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0025] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0026] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly 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 a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0027] See Figures 1 to 3 As shown

[0028] Overall Equipment Layout

[0029] This utility model adopts a modular satellite layout, arranged sequentially along the production line direction:

[0030] Front unwinding unit 1: Equipped with Ø1000mm unwinding rollers to carry substrate rolls and support glue supply from glue tank 11 up to 600kg.

[0031] Corona treatment unit 2: Equipped with a corona treatment device to pretreat the substrate surface to enhance coating adhesion;

[0032] Correction unit 3: It adopts high-precision sensors to monitor the substrate offset in real time and dynamically adjusts it through a servo drive mechanism;

[0033] Dual-coating composite host 4: core module, which includes two independent coating systems, each set of which is equipped with coating roller 7, composite roller 8, mirror steel roller 9 and cooling roller 10 to achieve simultaneous coating on both sides;

[0034] Rear unwinding unit 12: symmetrical layout with front unwinding, supports reverse substrate input;

[0035] Rewinding Unit 5: Equipped with a 2150mm take-up roller and an integrated tension control system to ensure the flatness of the finished roll.

[0036] Dual coating system implementation

[0037] Forward coating: The substrate is unwound 1 and then enters the double coating host 4 after corona treatment 2 and correction 3. The glue application system uniformly coats the hot melt adhesive on the front side of the substrate through the metering roller. After being pressed by the mirror steel roller 9, it is cured by the cooling roller (10).

[0038] Reverse coating: The substrate is simultaneously fed into the dual coating host 4 after unwinding 12. The adhesive application system completes the back coating of the substrate using the same process, and double-sided lamination is achieved through the composite roller 8.

[0039] Quick changeover: The dual coating system uses independent servo drives and can switch coating modes through a human-machine interface. It supports digital preset of coating parameters (such as glue amount and temperature), and the changeover time is shortened to within 15 minutes.

[0040] Satellite positioning technology

[0041] The dual coating host 4 adopts a multi-roll synchronous satellite structure, with each functional roll (coating, laminating, cooling) symmetrically distributed with the central steel roll as the reference, ensuring accurate and stable substrate path;

[0042] Equipped with a high-precision encoder and laser rangefinder, it achieves a positioning accuracy of ±0.1mm for the coating position;

[0043] The satellite layout supports multi-layer substrate overlay coating, and the production of composite products with more than 3 layers can be achieved by expanding the unwinding units (2-3 sets each at the front and rear).

[0044] Intelligent control system

[0045] Integrated PLC + touch screen control terminal to monitor the operating parameters (tension, temperature, speed) of each station in real time.

[0046] The glue tank 11 is equipped with an ultrasonic liquid level sensor and an automatic glue replenishment system to ensure continuous glue supply;

[0047] The winding unit 5 adopts a constant tension taper control algorithm to avoid wrinkling or loosening of the coil.

[0048] Working principle:

[0049] Substrate input and pretreatment

[0050] The front unwinding unit 1 releases the substrate roll, which is then conveyed to the corona treatment unit 2 via a Ø1000mm unwinding roller. The substrate surface is corona treated to enhance surface activity and improve adhesive adhesion.

[0051] The alignment unit 3 monitors the substrate offset in real time and dynamically adjusts it through a servo mechanism to ensure that the substrate enters the coating area with a precise path.

[0052] Dual-coating composite process

[0053] Forward coating: The pretreated substrate enters the double coating composite host 4. The upper coating system uniformly coats the hot melt adhesive onto the front side of the substrate through the metering roller. After being pressed by the mirror steel roller 9, it is quickly cured by the cooling roller 10.

[0054] Reverse coating: Simultaneously, the substrate released by the unwinding unit 12 enters the main machine from below, and the lower coating system completes the coating on the back of the substrate. It is then bonded to the front-coated substrate by the composite roller 8 to form a double-sided composite structure.

[0055] Satellite-based precise positioning

[0056] The dual-coating main unit adopts a multi-roll synchronous satellite structure, with the central steel roller as the reference, and the functional rollers (coating, laminating, cooling) are symmetrically distributed to ensure that the substrate path is stable and without deviation.

[0057] A high-precision encoder and laser rangefinder are used to calibrate the coating position in real time, achieving a positioning accuracy of ±0.1mm.

[0058] Intelligent control and tension management

[0059] The PLC + touch screen system monitors parameters (tension, temperature, speed) at each workstation in real time and supports digital presets and dynamic adjustments.

[0060] The glue box 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 deformation of the roll material.

[0061] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fully automatic double-coat hot melt adhesive coating machine, characterized in that, The system includes a front unwinding unit (1), a corona generator unit (2), a web guiding unit (3), a dual-coating composite host (4), a winding unit (5), and a rear unwinding unit (12), arranged sequentially along the production line direction, as well as a cooling system. The dual-coating composite host (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 and rear ends of the production line, respectively. The front unwinding unit (1) and the rear unwinding unit (12) are used to release the substrate roll to be coated. The dual-coating composite host (4) includes two independent coating systems. Each coating system includes 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 uniformly coat the hot melt adhesive onto the substrate surface. The composite roller (8) is used to bond different layers of substrate or coated layer, the mirror steel roller (9) assists in pressing the coated layer, and the cooling roller (10) is used to quickly cure the hot melt adhesive of the coating. The two sets of coating systems can cooperate to achieve simultaneous coating of the substrate in both directions. The dual coating composite host (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. It is 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 dual coating composite host (4) is also equipped with a coating machine (6) that works in conjunction with the coating roller (7).

2. The fully automatic double-coat hot melt adhesive coating machine according to claim 1, characterized in that, The front unwinding unit (1) and the rear unwinding unit (12) can be equipped with multiple unwinding rollers. The combination of multiple unwinding rollers can realize a multi-layer or side-by-side unwinding method.

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

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

6. The fully automatic double-coat hot melt adhesive coating machine according to claim 1, characterized in that, The corona generator (2) is equipped with a corona treatment device. The corona treatment device generates a high voltage corona to pretreat the surface of the substrate and change the physical and chemical properties of the substrate surface.

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

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

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