Production line for surface spraying of packaging material

Abstract

The utility model relates to the technical field of packaging material surface spraying, and provides a packaging material surface spraying production line. Comprising an unwinding section, a preheating section, a spraying section, a drying section and a winding section which are arranged in sequence; wherein the spraying section is provided with a spraying device and a heating device; the spraying device and the heating device are oppositely arranged in the conveying direction of the packaging material, the spraying device sprays spraying liquid towards the to-be-sprayed face of the packaging material, and the heating device heats the packaging material. The heating device is additionally arranged on the spraying section, the temperature of the packaging material is increased to the optimal temperature interval, when the packaging material is in the heated state, a certain amount of spraying liquid is sprayed to the surface of the packaging material through the spraying head, the spraying liquid containing the functional material can be rapidly dried to form a film on the surface of the packaging material, the good film forming quality is achieved, and the packaging material spraying device is suitable for large-scale popularization and application. And normal functions of the surface of the packaging material are ensured.

Description

Technical Field

[0001] This utility model relates to the field of surface coating technology for packaging materials, and in particular to a production line for surface coating of packaging materials. Background Technology

[0002] As consumers' demands for packaging continue to rise, ordinary packaging with basic mechanical properties can no longer meet their needs for products. Therefore, functional packaging has received great attention from brand owners and packaging manufacturers in recent years. With the continuous development of functional packaging technology, new materials and new packaging technologies are emerging one after another, and the functionality of packaging is becoming more diversified, with extremely wide application markets.

[0003] Basic materials such as PE, PP, and PET have relatively fixed barrier and surface properties. To improve the performance of these basic materials, it is necessary to combine them with functional materials to enhance their functionality. Currently known production processes for functional packaging materials include co-extrusion lamination, coating lamination, vacuum evaporation, roller coating, spraying, and blending.

[0004] However, some functional materials are special; they are formed by tiny particles adhering to the surface of the material and bonding tightly to it, making them difficult to fall off and exhibiting excellent film-forming properties, which is essential for them to perform their functions effectively. Research has shown that these special functional materials require a spray coating process to achieve better results.

[0005] The existing production line's spraying section only sprays the material, then dries it. This method is acceptable when the spraying liquid is a common solution such as ink. However, when the spraying liquid contains functional ingredients, there are special requirements during spraying: the droplets need to form a film quickly on the material surface. Since the spraying section lacks heating, when the droplets are sprayed onto the material surface, the low material temperature causes the water in the droplets to evaporate, resulting in a slow film formation rate and poor film quality for the functional ingredients, thus affecting the effectiveness of the product. Utility Model Content

[0006] This utility model provides a production line for spraying packaging materials to solve the technical problems in the prior art, such as slow film formation speed and poor film quality of functional components on the material surface due to the lack of heating measures in the spraying section, which affects the function of the material.

[0007] This utility model provides a production line for spraying the surface of packaging materials, including an unwinding section, a preheating section, a spraying section, a drying section, and a winding section arranged in sequence; wherein, the spraying section is equipped with a spraying device and a heating device; the spraying device and the heating device are arranged opposite to each other along the conveying direction of the packaging material, the spraying device sprays spray liquid toward the surface of the packaging material to be sprayed, and the heating device heats the packaging material.

[0008] According to the present invention, a production line for spraying the surface of packaging materials includes a spraying device comprising at least a support, a nozzle, and a spraying assembly; the support is disposed on the side of the packaging material conveying direction; the nozzle is disposed on the support and faces the surface of the packaging material to be sprayed; the spraying assembly is connected to the nozzle and is used to provide spraying liquid to the nozzle.

[0009] According to the production line for spraying the surface of packaging materials provided by this utility model, the support is provided with a guide rail, and the spray head is slidably connected to the guide rail to realize the position adjustment of the spray head.

[0010] According to the present invention, a production line for spraying the surface of packaging materials includes a spraying assembly comprising a connector; one end of the connector is slidably connected to the guide rail, and the other end of the connector is hinged to the side of the spray head to achieve angle adjustment of the spray head.

[0011] According to the production line for surface coating of packaging materials provided by this utility model, the heating device is one or a combination of several of the following: electric heating plate, electric heating wire and carbon lamp;

[0012] The heating surface of the electric heating plate is in contact with the packaging material;

[0013] The arrangement direction of the heating wire is perpendicular to the conveying direction of the packaging material;

[0014] The carbon lamps are arranged at intervals in the direction of conveying the packaging material.

[0015] According to the production line for surface coating of packaging materials provided by this utility model, the coating section is further provided with a receiving box;

[0016] The receiving box is disposed opposite to the spraying device, and the receiving box is located on the side of the packaging material away from the spraying device;

[0017] The receiving box has an open side facing the packaging material, and is used to catch the sprayed liquid splashed from the packaging material.

[0018] The production line for surface coating of packaging materials according to the present invention further includes an exhaust fan; a ventilation pipe is provided at the position opposite to the packaging material in the receiving box;

[0019] The exhaust fan is located on the side of the receiving box opposite to the packaging material, and the exhaust fan is connected to the ventilation pipe for extracting the splashed coating liquid.

[0020] According to the present invention, a production line for surface coating of packaging materials is provided, wherein the drying section includes a drying channel;

[0021] The drying channel is equipped with drying and heating devices arranged at intervals along the conveying direction of the packaging material, and the top wall of the drying channel is equipped with drying and ventilation devices.

[0022] The drying and heating equipment is at least one of heating tiles, heating wires, and infrared heaters.

[0023] According to the present invention, a production line for surface coating of packaging materials further includes an imprinting section; the imprinting section is disposed between the unwinding section and the preheating section; the imprinting section includes a rubber roller, a pattern roller, a cooling roller, and a tension roller; the outer surface of the rubber roller and the outer surface of the pattern roller are pressed together for imprinting the packaging material; the cooling roller is disposed at the rear section of the pattern roller; the tension roller is disposed at the rear section of the cooling roller to provide tension to the packaging material.

[0024] The production line for surface coating of packaging materials provided by this utility model further includes a first pressure sensor and a second pressure sensor.

[0025] The first pressure sensor is disposed between the unwinding section and the preheating section to detect the tension of the packaging material before it is coated.

[0026] The second pressure sensor is disposed between the drying section and the winding section to detect the tension of the packaging material after it has been coated.

[0027] The production line for surface coating of packaging materials provided by this utility model raises the temperature of the packaging material to the optimal temperature range by adding a heating device to the coating section. When the packaging material is heated, the nozzle sprays a certain amount of coating liquid onto the surface of the packaging material. The coating liquid containing functional materials can quickly dry and form a film on the surface of the packaging material, with good film quality, ensuring that the surface of the packaging material can perform its normal function. Attached Figure Description

[0028] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a production line for spraying the surface of packaging materials provided by this utility model;

[0030] Figure 2 This is a structural diagram of the nozzle, bracket, and spraying assembly provided by this utility model;

[0031] Figure 3 This is a schematic diagram showing the connection between the receiving box and the exhaust fan provided by this utility model;

[0032] Figure 4 This is a schematic diagram of the imprinting section provided by this utility model.

[0033] Figure label:

[0034] 1: Release the roll segment;

[0035] 2: Preheating section;

[0036] 3: Spraying section; 31: Spraying device; 311: Bracket; 312: Spray nozzle; 313: Guide rail; 314: Connector; 32: Heating device; 33: Material receiving box; 34: Exhaust fan; 35: Ventilation duct;

[0037] 4: Drying section;

[0038] 5: Rewinding section;

[0039] 61: Rubber roller; 62: Patterned roller; 63: Cooling roller; 64: Tension roller;

[0040] 7: First pressure sensor;

[0041] 8: Second pressure sensor. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0043] The following is combined Figures 1-4This invention describes a production line for surface coating of packaging materials.

[0044] Figure 1 This is a schematic diagram of a production line for spraying packaging materials according to this utility model, as shown below. Figure 1 As shown, this utility model provides a production line for spraying the surface of packaging materials, which can be applied to improve the inner surface performance of food packaging material rolls, giving the inner surface of the material better pre-set functionality. The embodiment provides an unwinding section 1, a preheating section 2, a spraying section 3, a drying section 4, and a winding section 5 arranged in sequence. Among them, the spraying section 3 is equipped with a spraying device 31 and a heating device 32. The spraying device 31 and the heating device 32 are arranged opposite to each other along the conveying direction of the packaging material. The spraying device 31 sprays the spraying liquid toward the surface of the packaging material to be sprayed to form a functional coating. The heating device 32 heats the packaging material. Under the heated state, the packaging material is sprayed with a certain amount of spraying liquid, and the spraying liquid dries quickly on the surface of the material to form a film.

[0045] Furthermore, in the embodiments of this utility model, it includes a traction section, a preheating section, a heating section, a spraying section, a drying section, a spraying exhaust section, and a drying exhaust section; wherein, other forming processes can be added before the spraying section 3, or an unwinding process can be added directly; the spraying section 3 can be one or multiple; after the process of the spraying section 3 is completed, a slitting process can be added, or a winding process can be added directly.

[0046] Furthermore, the preheating section 2 mentioned above generally adopts a preheating roller, or it can be designed as a preheating channel. The temperature of the preheating roller or preheating channel is above 80°C. After the processed packaging material leaves the preheating section 2, the surface temperature of the material needs to reach above 30°C and be maintained at above 30°C before entering the next heating and spraying stage.

[0047] Figure 2 This is a structural diagram of the spray nozzle 312, the bracket 311, and the spraying assembly provided by this utility model, as shown below. Figure 2 As shown, according to an embodiment of the present invention, a production line for spraying the surface of packaging materials includes a spraying device 31 comprising at least a support 311, a nozzle 312, and a spraying assembly. The support 311 is disposed on the side of the packaging material conveying direction. The nozzle 312 is disposed on the support 311 and faces the surface of the packaging material to be sprayed. The spraying assembly is connected to the nozzle 312 and is used to provide spraying liquid to the nozzle 312. The number of nozzles 312 is determined according to the spraying range of the nozzle 312 and the width of the material to be sprayed, and can be one or more.

[0048] Furthermore, in one embodiment of this utility model, the spraying assembly may also include a tank containing spraying liquid, a pump providing spraying power, a delivery pipe for conveying the spraying liquid, a valve for controlling the spraying pressure, and a pressure gauge for displaying the pressure.

[0049] According to an embodiment of the present invention, a production line for spraying the surface of packaging materials is provided, wherein the support 311 is provided with a guide rail 313, and the nozzle 312 is slidably connected to the guide rail 313 to realize the position adjustment of the nozzle 312.

[0050] Furthermore, in a specific embodiment of this utility model, the bracket 311 may include multiple guide rails 313, which may be arranged horizontally, vertically, or obliquely. The guide rails 313 may be elongated holes or sliding grooves. The side of the nozzle 312 may be provided with a snap-fit ​​component, which can snap onto the guide rail 313, allowing the nozzle 312 to slide on the guide rail 313. At the same time, the snap-fit ​​component also has a fastening function, which can fix the nozzle 312 after it has moved to a designated position, preventing the nozzle 312 from slipping during the spraying process.

[0051] According to the production line for spraying the surface of packaging materials provided by this utility model, the spraying component includes a connector 314; one end of the connector 314 is slidably connected to the guide rail 313, and the other end of the connector 314 is hinged to the side of the nozzle 312 to realize the angle adjustment of the nozzle 312.

[0052] Specifically, one end of the connector 314 is provided with a retainer, which can be engaged and secured with the guide rail 313. The other end of the connector 314 is provided with a hinge ball sleeve, and the other end of the hinge ball sleeve is fixed to the side of the nozzle 312. In this way, the nozzle 312 and the connector 314 are hinged. The orientation of the nozzle 312 can be adjusted by rotating the hinge ball, so that the nozzle 312 can be perpendicular to the surface of the packaging material to be sprayed, or can form any suitable angle with the surface of the packaging material.

[0053] According to an embodiment of the present invention, a production line for spraying the surface of packaging materials is provided, wherein the heating device 32 is an electric heating plate; there are multiple electric heating plates, which are arranged at intervals within the spraying range of the spraying device 31. The edges of the electric heating plates preferably extend beyond or are flush with the sides of the packaging material to ensure that all the packaging material is heated; wherein, the heating surface of the electric heating plate is in contact with the packaging material, which can maximize the heat transfer efficiency and save energy.

[0054] In another embodiment of this utility model, the heating device 32 is an electric heating wire; there are multiple electric heating wires, which are arranged at intervals within the spraying range of the spraying device 31; wherein, the arrangement direction of the electric heating wires is perpendicular to the conveying direction of the packaging material, and this arrangement is also to improve the heat transfer efficiency.

[0055] In another embodiment of this utility model, the heating device 32 is a carbon lamp; there are multiple carbon lamps, which are arranged at intervals in the conveying direction of the packaging material, and all carbon lamps are arranged on the back side of the packaging material to be coated.

[0056] In addition, depending on actual needs, the heating plate, heating wire and carbon lamp mentioned above can be used in combination without any restrictions on quantity or location, as long as the surface temperature of the packaging material reaches above 50°C.

[0057] According to the production line for spraying the surface of packaging materials provided by this utility model, due to the strong impact between the spraying liquid and the material surface during the spraying process, the spraying liquid splashes. In order to maintain the hygiene and safety of the production environment, a receiving box 33 is set below the heating device 32. The receiving box 33 is set opposite to the spraying device 31, and the receiving box 33 is located on the side of the packaging material away from the spraying device 31. One side of the receiving box 33 is open, and the opening of the receiving box 33 faces the packaging material to receive the spraying liquid splashed from the packaging material.

[0058] further, Figure 3 This is a schematic diagram showing the connection between the receiving box 33 and the exhaust fan 34 provided by this utility model. Figure 3 As shown, a production line for spraying the surface of packaging materials according to an embodiment of the present invention further includes an exhaust fan 34; a ventilator 35 is provided at the location of the receiving box 33 opposite to the packaging material; the exhaust fan 34 is located on the side of the receiving box 33 facing away from the packaging material, and the exhaust fan 34 is connected to the ventilator 35 for extracting splashed spray liquid for further processing of the spray liquid.

[0059] In one embodiment of this utility model, after the packaging material coated with the spraying liquid exits from the spraying section 3, in order to dry better, the packaging material coated with the functional spraying liquid enters the drying section. The drying section includes a drying channel, and the drying temperature of the drying channel is greater than 30°C. The interior of the drying channel is provided with drying heating devices arranged at intervals along the conveying direction of the packaging material. The drying heating devices are at least one of heating tiles, heating wires, and infrared heaters. The top wall of the drying channel is provided with drying ventilation equipment. This is mainly to absorb excess volatile solvents on the surface of the sprayed material. After the sprayed material exits from the drying channel, it can be ensured that the surface of the material is completely dry.

[0060] Figure 4 This is a schematic diagram of the imprinting section provided by this utility model, as shown below. Figure 4As shown, the production line for surface coating of packaging materials according to the present invention further includes an imprinting section; the imprinting section is disposed between the unwinding section 1 and the preheating section 2; the imprinting section includes a rubber roller 61, a pattern roller 62, a cooling roller 63, and a tension roller 64; the outer side of the rubber roller 61 and the outer side of the pattern roller 62 are pressed together for imprinting the packaging material; the cooling roller 63 is disposed at the rear section of the pattern roller 62; the tension roller 64 is disposed at the rear section of the cooling roller 63 to provide tension for the packaging material.

[0061] According to an embodiment of this utility model, a production line for surface coating of packaging materials requires a traction device for traction during the entire coating process. A first pressure sensor 7 and a second pressure sensor 8 are designed for tension monitoring. The first pressure sensor 7 is located between the unwinding section 1 and the preheating section 2 to detect the tension of the packaging material before coating. The second pressure sensor 8 is located between the drying section 4 and the winding section 5 to detect the tension of the packaging material after coating. This ensures that the packaging material remains taut and does not loosen during the coating process; generally, a tension of 50N or higher is preferable.

[0062] Furthermore, two embodiments of this utility model are provided.

[0063] Example 1

[0064] Using the production line provided by this utility model, PE composite aluminum film is sprayed and processed. The specific process flow is as follows: unwinding → preheating → first heating → first spraying → first drying → second heating → second spraying → second drying → third heating → third spraying → third drying → fourth heating → fourth spraying → fourth drying → fifth heating → fifth spraying → fifth drying → winding.

[0065] The specific parameters are as follows: preheating temperature 80℃, heating plate temperature 130℃, nozzle 312 air pressure 0.4 bar, nozzle 312 hydraulic pressure 0.5 bar, oven temperature 100℃, machine speed 30 m / min, nozzle 312 height 10 cm, tension 50 N, and 5 coats. Functional particles accumulate, forming a good deposition effect and exhibiting excellent pre-set functionality. Because the sprayed liquid impacts the packaging material surface during the spraying process, and the packaging material surface has a certain temperature, there is excellent adhesion between the sprayed liquid and the packaging material surface, making the coating less prone to peeling and cracking.

[0066] Example 2

[0067] Using the production line provided by this utility model, paper aluminum-plastic film is sprayed and processed. The specific process flow is as follows: unwinding → preheating → first heating → first spraying → first drying → rewinding.

[0068] The specific parameters are as follows: preheating temperature 80℃, heating plate temperature 150℃, nozzle 312 air pressure 0.65 bar, nozzle 312 hydraulic pressure 0.65 bar, oven temperature 100℃, machine speed 100m / min, nozzle 312 height 15cm, tension 60N, and one coat. The functional coating liquid can be wicked into the PE material. Through the control of the above process parameters, the coating liquid is evenly covered on the inner surface of the packaging material. Because the coating liquid has a large impact force on the packaging material during spraying, it is quickly wicked into the PE material. Simultaneously, a heating and drying process is included, allowing the coating liquid to quickly dry into a film on the surface of the packaging material with no excess liquid, achieving excellent pre-set functionality on the packaging material surface.

[0069] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A production line for surface spraying of packaging material, characterized in that The coating device comprises a unwinding section (1), a preheating section (2), a spraying section (3), a drying section (4) and a winding section (5) arranged in sequence. The spraying section (3) is provided with a spraying device (31) and a heating device (32). The spraying device (31) and the heating device (32) are oppositely arranged along the conveying direction of the packaging material, the spraying device (31) sprays the spraying liquid towards the spraying surface of the packaging material, and the heating device (32) heats the packaging material.

2. The packaging material surface spray-coating line according to claim 1, characterized in that, The spraying device (31) comprises a support (311), a nozzle (312) and a spraying assembly. The support (311) is arranged on the side of the conveying direction of the packaging material. The nozzle (312) is arranged on the support (311) and faces the spraying surface of the packaging material. The spraying assembly is connected with the nozzle (312) and is used for providing the nozzle (312) with the spraying liquid.

3. The packaging material surface spray-coating line according to claim 2, characterized in that, The support (311) is provided with a guide rail (313), and the nozzle (312) is slidably connected with the guide rail (313) to adjust the position of the nozzle (312).

4. The packaging material surface spray-coating line according to claim 3, characterized in that, The spraying assembly comprises a connecting piece (314). One end of the connecting piece (314) is slidably connected with the guide rail (313), and the other end of the connecting piece (314) is hingedly connected with the side of the nozzle (312) to adjust the angle of the nozzle (312).

5. The packaging material surface spray-coating line according to claim 1, characterized in that, The heating device (32) is one or a combination of electric heating plates, electric heating wires and carbon lamps. The heating surface of the electric heating plate is attached to the packaging material. The arrangement direction of the electric heating wire is perpendicular to the conveying direction of the packaging material. The carbon lamps are arranged at intervals in the conveying direction of the packaging material.

6. The packaging material surface spray-coating line according to claim 1, characterized in that, The spraying section (3) is further provided with a receiving box (33). The receiving box (33) is oppositely arranged with the spraying device (31), and the receiving box (33) is located on the side of the packaging material away from the spraying device (31). The receiving box (33) is open on one side, and the opening of the receiving box (33) faces the packaging material and is used for receiving the spraying liquid splashed from the packaging material.

7. The packaging material surface spray-coating line according to claim 6, characterized in that, Further comprising an air extractor (34). The receiving box (33) is provided with a ventilation pipe (35) opposite to the packaging material. The air extractor (34) is arranged on the side of the receiving box (33) away from the packaging material, and the air extractor (34) is connected with the ventilation pipe (35) and is used for extracting the splashed spraying liquid.

8. The packaging material surface spray-coating line according to claim 1, characterized in that, The drying section comprises a drying channel. The inside of the drying channel is provided with drying heating equipment arranged at intervals in the conveying direction of the packaging material, and the top wall of the drying channel is provided with drying ventilation equipment. The drying heating equipment is at least one of heating tiles, heating wires and infrared heaters.

9. The production line for surface spraying of packaging material according to any of claims 1-8, characterized in that, Further comprising a stamping section. The stamping section is arranged between the unwinding section (1) and the preheating section (2). The stamping section comprises a rubber roller (61), a pattern roller (62), a cooling roller (63) and a tension roller (64). The outer side of the rubber roller (61) and the outer side of the flower roller (62) are pressed for embossing the packaging material; The cooling roller (63) is arranged at the rear section of the flower roller (62); The tension roller (64) is arranged at the rear section of the cooling roller (63) to provide tension for the packaging material.

10. The surface-coating production line for packaging materials according to any one of claims 1-8, characterized in that, Further comprising a first pressure sensor (7) and a second pressure sensor (8); The first pressure sensor (7) is arranged between the unwinding section (1) and the preheating section (2) to detect the tension of the packaging material before spraying; The second pressure sensor (8) is arranged between the drying section (4) and the winding section (5) to detect the tension of the packaging material after spraying.

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