Thin film annealing device and annealing method

Abstract

The invention discloses a thin film annealing device which comprises a preheating assembly, an annealing assembly and a cooling assembly. The preheating assembly, the annealing assembly and the cooling assembly are sequentially connected to equipment, and a first idler roller and a second idler roller are arranged at the front end of the preheating assembly; a third idler roller is arranged at the rear end of the cooling assembly; a thin film is led in through the first idler roller and the second idler roller, wound on the preheating assembly, the annealing assembly and the cooling assembly and led out from the third idler roller; a group of lower floating roller adjusting mechanisms and a group of upper floating roller adjusting mechanisms are respectively arranged between the preheating assembly and the annealing assembly as well as between the annealing assembly and the cooling assembly. According to the thin film annealing device and the thin film annealing method, the existing defects are overcome, and the thin film annealing quality and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to a thin film annealing device and an annealing method. Background Art

[0002] During the film production process, due to factors such as rapid cooling, the film has incomplete crystallization and generates large internal stress, which seriously affects the performance of the film, such as reducing the tensile strength, flexibility and dimensional stability of the film. Traditional annealing methods (hot air annealing, infrared annealing, vacuum annealing) often have problems such as uneven annealing effect, high energy consumption, and low production efficiency, which are difficult to meet the needs of modern industry for high-quality and high-efficiency film production. In particular, during the annealing process, the film is softened by heat, and it is easy to produce "diamond" lines when passing through the annealing rollers, and wrinkles are easy to form between the annealing rollers, and tensile deformation occurs, which has always been a difficulty in film annealing.

[0003] In the traditional film annealing method, on the one hand, it is difficult to accurately control the tension of the film during annealing, resulting in uneven stretching, wrinkles, and even cracks in the film during the annealing process, which seriously affects the quality and yield of the film. On the other hand, the existing annealing equipment structure design is not reasonable enough, and the tension cannot be flexibly adjusted according to the real-time state of the film. In addition, the collaborative work effect between the annealing rollers is not good, making it difficult to meet the diverse annealing needs of films of different materials and thicknesses.

[0004] CN201810298460.5 proposes an annealing and shaping device for a cast-film electronic protective film, including a frame and at least two groups of annealing roller groups, each group of annealing roller groups has at least two groups of annealing rollers, and the annealing rollers are distributed in an S shape, so that the film material is wound in an S shape, increasing the contact time between the film material and the annealing rollers, and improving the annealing effect. The annealing rollers close to the film feed and film outlet directions are provided with a pressure roller mechanism, which can control the pressure of the pressure roller on the film material. A tension sensing component is also provided, which is composed of a tension roller close to the film feed and film outlet directions and a connected tension sensor, which is used to detect the tension of the film material, and adjust the tension of the film material by controlling the pressure of the pressure roller to ensure that the thickness, transparency and viscosity of the film material meet the production requirements. This patent fails to effectively solve the problem of wrinkles generated when the film passes through the annealing roller and between the annealing rollers.

[0005] Therefore, in order to solve the above problems, a thin film annealing device and an annealing method are proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the existing defects and provide a thin film annealing device and annealing method, thereby improving the thin film annealing quality and production efficiency.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a film annealing device, comprising a preheating assembly, an annealing assembly and a cooling assembly; the preheating assembly, the annealing assembly and the cooling assembly are sequentially connected to the equipment, the front end of the preheating assembly is provided with a first idle roller and a second idle roller; the rear end of the cooling assembly is provided with a third idle roller; the film is introduced through the first idle roller and the second idle roller, is wound around the preheating assembly, the annealing assembly and the cooling assembly, and is led out from the third idle roller;

[0008] A group of lower floating roller adjustment mechanisms and a group of upper floating roller adjustment mechanisms are respectively arranged between the preheating assembly and the annealing assembly, and between the annealing assembly and the cooling assembly.

[0009] Preferably, the preheating assembly comprises a first preheating roller and a second preheating roller; the first preheating roller and the second preheating roller are rotatably connected to the device.

[0010] Preferably, the annealing assembly comprises a first annealing roller and a second annealing roller; the first annealing roller and the second annealing roller are rotatably connected to the device;

[0011] The first annealing roller and the second annealing roller are each provided with an infrared heating device.

[0012] Preferably, the cooling assembly includes a first cooling roller and a second cooling roller; the first cooling roller and the second cooling roller are rotatably connected to the equipment.

[0013] Preferably, it also includes a plurality of groups of pressure roller pressure regulating components; a group of the pressure roller pressure regulating components is respectively provided at the first preheating roller, the second preheating roller, the first annealing roller, the second annealing roller, the first cooling roller and the second cooling roller.

[0014] Preferably, the pressure roller pressure adjusting assembly includes a pressure roller pressure adjusting cylinder, a pressure roller pressure adjusting connecting rod and a pressure roller; the middle part of the pressure roller pressure adjusting connecting rod is rotatably connected to the equipment through a pin shaft, one end of the pressure roller pressure adjusting connecting rod is rotatably connected to the pressure roller pressure adjusting cylinder, and the other end is rotatably connected to the pressure roller.

[0015] An annealing method for a thin film annealing device comprises the following steps;

[0016] Step S1, preparation, equipment debugging and parameter setting;

[0017] Step S2, annealing work, film conveying and annealing.

[0018] The step S1, preparation work, equipment debugging and parameter setting includes:

[0019] Step S11, select a polypropylene film with a thickness of 0.05mm and a width of 1000mm; check whether the various components of the film annealing equipment are operating normally; according to the characteristics of the polypropylene film, set the pressure of the pressure roller to 5N, set the target tension value of the lower floating roller adjustment mechanism and a group of upper floating roller adjustment mechanisms to 8N, the annealing temperature of the first preheating roller, the second preheating roller, the first annealing roller and the second annealing roller is 150°C, the heating rate is 5°C / min, the holding time is 15 minutes, and the cooling rate of the first cooling roller and the second cooling roller is 10°C / s.

[0020] The step S2, annealing work, film conveying and annealing includes:

[0021] Step S21, slowly conveying the film to the annealing equipment through the first idle roller and the second idle roller, and bypassing the first preheating roller, the second preheating roller, the first annealing roller, the second annealing roller, the first cooling roller and the second cooling roller in sequence; and multiple groups of pressure roller pressure adjustment components, lower floating roller adjustment mechanisms and upper floating roller adjustment mechanisms; the first preheating roller, the second preheating roller, the first annealing roller and the second annealing roller start working, and heat the film to 150°C according to the set heating rate, and keep it for 15 minutes; during the annealing process, the pressure roller always applies a pressure of 5N to the film to ensure that the film runs stably on the first annealing roller and the second annealing roller; at the same time, the lower floating roller adjustment mechanism and the upper floating roller adjustment mechanism monitor the film tension in real time, and when the tension fluctuates, the adjustment drive device quickly adjusts the floating roller position to stabilize the tension at about 8N; after the film completes annealing and heat preservation, it enters the cooling system, and quickly cools to room temperature at a cooling rate of 10°C / s, and then is led out by the third idle roller; finally, the winding device winds up the cooled film.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The film annealing device and annealing method have precise tension control: through the pressure rollers corresponding to each annealing roller and the floating adjustment mechanism between the annealing rollers, the tension of the film during the annealing process can be controlled in real time and accurately. This precise tension control effectively avoids problems such as stretching deformation and wrinkles caused by uneven tension of the film, greatly improves the annealing quality of the film, and significantly improves the dimensional stability. According to tests, the dimensional stability error of the film annealed using the device and method of the present invention is controlled within ±0.3%.

[0024] It has wide applicability: the pressure of the pressing roller and the tension control parameters of the floating adjustment mechanism can be flexibly adjusted according to the material, thickness, width and other parameters of different films, and is suitable for annealing of various types of films, such as plastic films, metal films, optical films, etc. Whether it is a thin electronic packaging film or a thick industrial packaging film, a good annealing effect can be obtained by the device and method of the present invention.

[0025] Improved production efficiency: Precise tension control enables the film to complete the annealing process in a shorter time, and reduces the scrap rate and rework rate caused by film quality problems, thereby improving production efficiency and reducing production costs. Compared with traditional annealing equipment, production efficiency can be increased by 30%-50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 is a schematic diagram of a thin film annealing device of the present invention;

[0028] Figure 2 It is a schematic diagram of the annealing method of the thin film annealing device of the present invention;

[0029] Figure 3 A detailed diagram of step S1 of the annealing method of the thin film annealing device of the present invention;

[0030] Figure 4 Detailed view of step S2 of the annealing method of the thin film annealing device of the present invention.

[0031] In the figure: 1. film; 2. first idler roller; 3. second idler roller; 4. pressure roller pressure regulating cylinder; 5. pressure roller pressure regulating connecting rod; 6. pressure roller; 7. first preheating roller; 8. second preheating roller; 9. lower floating roller adjusting mechanism; 10. upper floating roller adjusting mechanism; 11. first annealing roller; 12. second annealing roller; 13. infrared heating device; 14. first cooling roller; 15. second cooling roller; 16. third idler roller. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1A film annealing device comprises a preheating assembly, an annealing assembly and a cooling assembly; the preheating assembly, the annealing assembly and the cooling assembly are connected to the equipment in sequence, the front end of the preheating assembly is provided with a first idle roller 2 and a second idle roller 3; the rear end of the cooling assembly is provided with a third idle roller 16; the film 1 is introduced through the first idle roller 2 and the second idle roller 3, is wound around the preheating assembly, the annealing assembly and the cooling assembly, and is led out from the third idle roller 16. A group of lower floating roller adjustment mechanisms 9 and a group of upper floating roller adjustment mechanisms 10 are respectively provided between the preheating assembly and the annealing assembly, and between the annealing assembly and the cooling assembly.

[0034] Specifically, a lower floating roller adjustment mechanism 9 and an upper floating roller adjustment mechanism 10 are arranged between annealing rollers with different functions. The mechanism mainly consists of a floating roller, a tension sensor and an adjustment drive device. The floating roller is installed on the guide rail of the frame through a slider that can move up and down, and can automatically adjust its position according to the change of film tension. The tension sensor is installed on the supporting shaft of the floating roller to monitor the tension value of the film in real time. When the tension sensor detects that the film tension changes, it transmits the signal to the adjustment cylinder. The adjustment drive device drives the floating roller up and down through a connecting rod mechanism according to the received signal, thereby adjusting the tension of the film. For example, when the film tension is too large, the adjustment drive device drives the floating roller to rise, relax the film, and reduce the tension; when the film tension is too small, the floating roller descends, tightens the film, and increases the tension. Each floating roller adjustment mechanism has two groups, an upper floating roller adjustment mechanism 10 and a lower floating roller adjustment mechanism 9. The upper floating roller adjustment mechanism 10 is activated when the film has longitudinal stripes to increase the wrap angle entering the next roller, while the lower floating roller adjustment mechanism 9 is used under normal circumstances.

[0035] Specifically, the preheating assembly includes a first preheating roller 7 and a second preheating roller 8; the first preheating roller 7 and the second preheating roller 8 are rotatably connected to the device. The annealing assembly includes a first annealing roller 11 and a second annealing roller 12; the first annealing roller 11 and the second annealing roller 12 are rotatably connected to the device; an infrared heating device 13 is provided on each of the first annealing roller 11 and the second annealing roller 12. The cooling assembly includes a first cooling roller 14 and a second cooling roller 15; the first cooling roller 14 and the second cooling roller 15 are rotatably connected to the device.

[0036] Specifically, the number of preheating rollers, annealing rollers, and cooling rollers can be increased in even numbers such as 2, 4, 6, 8, etc. according to the annealing process requirements. The temperature of the preheating roller is set at 5°C above the softening point of the film material and within 15°C. The temperature of the annealing roller is set at 15°C below the melting point of the film material and within 30°C. The temperature of the cooling roller is set at 15°C above the room temperature and within 40°C.

[0037] Specifically, it also includes multiple groups of roller pressure adjustment components; one group of roller pressure adjustment components is respectively provided at the first preheating roller 7, the second preheating roller 8, the first annealing roller 11, the second annealing roller 12, the first cooling roller 14 and the second cooling roller 15. The roller pressure adjustment component includes a roller pressure adjustment cylinder 4, a roller pressure adjustment connecting rod 5 and a roller 6; the middle part of the roller pressure adjustment connecting rod 5 is rotatably connected to the equipment through a pin shaft, one end of the roller pressure adjustment connecting rod 5 is rotatably connected to the roller pressure adjustment cylinder 4, and the other end is rotatably connected to the roller 6.

[0038] Specifically, the roller pressure regulating cylinder 4 controls the opening and closing of the roller 6 through the roller pressure regulating connecting rod 5, and the roller pressure regulating cylinder 4 is equipped with a spiral regulating device to control the roller pressure. The operator can accurately adjust the pressure of the roller on the film on the annealing roller through the pressure regulating device according to the material, thickness and preset tension requirements of the film. For example, for thinner and softer films, the roller pressure can be appropriately reduced to avoid damage to the film due to excessive squeezing; for thicker and more rigid films, the roller pressure can be increased to better control the running state of the film on the annealing roller.

[0039] Specifically, a polypropylene film with a thickness of 0.05 mm and a width of 1000 mm was selected; whether each component of the film annealing equipment was operating normally was checked; according to the characteristics of the polypropylene film, the pressure of the pressing roller 6 was set to 5N, and the target tension values ​​of the lower floating roller adjustment mechanism 9 and a group of upper floating roller adjustment mechanisms 10 were set to 8N. The annealing temperatures of the first preheating roller 7, the second preheating roller 8, the first annealing roller 11 and the second annealing roller 12 were 150°C, the heating rate was 5°C / min, the holding time was 15 minutes, and the cooling rate of the first cooling roller 14 and the second cooling roller 15 was 10°C / s.

[0040] Specifically, the film 1 is slowly conveyed to the annealing device through the first idler roller 2 and the second idler roller 3, and passes through the first preheating roller 7, the second preheating roller 8, the first annealing roller 11, the second annealing roller 12, the first cooling roller 14 and the second cooling roller 15 in sequence; as well as multiple groups of pressure roller pressure adjustment components, the lower floating roller adjustment mechanism 9 and the upper floating roller adjustment mechanism 10; the first preheating roller 7, the second preheating roller 8, the first annealing roller 11 and the second annealing roller 12 start to work, and heat the film to 150°C according to the set heating rate, and keep it for 15 minutes; during the annealing process, the film is heated to 150°C at a set heating rate, and kept for 15 minutes. During the process, the pressure roller 6 always applies a pressure of 5N to the film 1 to ensure that the film 1 runs stably on the first annealing roller 11 and the second annealing roller 12; at the same time, the lower floating roller adjustment mechanism 9 and the upper floating roller adjustment mechanism 10 monitor the film tension in real time. When the tension fluctuates, the adjustment drive device quickly adjusts the position of the floating roller to stabilize the tension at about 8N; after the film completes annealing and heat preservation, it enters the cooling system and quickly cools to room temperature at a cooling rate of 10℃ / s, and then is led out by the third idle roller 16; finally, the winding device winds up the cooled film.

[0041] See also Figure 2-4 , an annealing method of a thin film annealing device, comprising the following steps;

[0042] Step S1, preparation, equipment debugging and parameter setting;

[0043] Step S2, annealing work, film conveying and annealing.

[0044] Step S1, preparation, equipment debugging and parameter setting include;

[0045] Step S11, select a polypropylene film with a thickness of 0.05mm and a width of 1000mm; check whether the various components of the film annealing equipment are operating normally; according to the characteristics of the polypropylene film, set the pressure of the pressure roller 6 to 5N, set the target tension value of the lower floating roller adjustment mechanism 9 and a group of upper floating roller adjustment mechanisms 10 to 8N, the annealing temperature of the first preheating roller 7, the second preheating roller 8, the first annealing roller 11 and the second annealing roller 12 is 150°C, the heating rate is 5°C / min, the holding time is 15 minutes, and the cooling rate of the first cooling roller 14 and the second cooling roller 15 is 10°C / s.

[0046] Step S2, annealing work, film conveying and annealing includes;

[0047] Step S21, the film 1 is slowly conveyed to the annealing equipment through the first idler roller 2 and the second idler roller 3, and passes through the first preheating roller 7, the second preheating roller 8, the first annealing roller 11, the second annealing roller 12, the first cooling roller 14 and the second cooling roller 15 in sequence; and multiple groups of pressure roller pressure adjustment components, the lower floating roller adjustment mechanism 9 and the upper floating roller adjustment mechanism 10; the first preheating roller 7, the second preheating roller 8, the first annealing roller 11 and the second annealing roller 12 start to work, and heat the film to 150°C according to the set heating rate, and keep it for 15 minutes; in the annealing During the process, the pressure roller 6 always applies a pressure of 5N to the film 1 to ensure that the film 1 runs stably on the first annealing roller 11 and the second annealing roller 12; at the same time, the lower floating roller adjustment mechanism 9 and the upper floating roller adjustment mechanism 10 monitor the film tension in real time. When the tension fluctuates, the adjustment drive device quickly adjusts the position of the floating roller to stabilize the tension at about 8N; after the film completes annealing and heat preservation, it enters the cooling system and quickly cools to room temperature at a cooling rate of 10℃ / s, and then is led out by the third idle roller 16; finally, the cooled film is rolled up by the winding device.

[0048] After annealing, the polypropylene film has a smooth surface without wrinkles or tensile deformation. Through mechanical property testing, the tensile strength of the film increased from 30MPa before annealing to 38MPa, and the dimensional stability was good. The dimensional change rate was less than ±0.3% under different ambient temperatures, meeting the performance requirements of high-quality packaging films.

[0049] The film annealing device and annealing method have precise tension control: through the pressure rollers corresponding to each annealing roller and the floating adjustment mechanism between the annealing rollers, the tension of the film during the annealing process can be controlled in real time and accurately. This precise tension control effectively avoids problems such as stretching deformation and wrinkles caused by uneven tension of the film, greatly improves the annealing quality of the film, and significantly improves the dimensional stability. According to tests, the dimensional stability error of the film annealed using the device and method of the present invention is controlled within ±0.3%.

[0050] It has wide applicability: the pressure of the pressing roller and the tension control parameters of the floating adjustment mechanism can be flexibly adjusted according to the material, thickness, width and other parameters of different films, and is suitable for annealing of various types of films, such as plastic films, metal films, optical films, etc. Whether it is a thin electronic packaging film or a thick industrial packaging film, a good annealing effect can be obtained by the device and method of the present invention.

[0051] Improved production efficiency: Precise tension control enables the film to complete the annealing process in a shorter time, and reduces the scrap rate and rework rate caused by film quality problems, thereby improving production efficiency and reducing production costs. Compared with traditional annealing equipment, production efficiency can be increased by 30%-50%.

[0052] The thin film annealing device and annealing method have significant advantages in improving the quality and production efficiency of thin film annealing. In actual production applications, the equipment parameters and annealing process can be further optimized according to the specific needs of different films to achieve the best annealing effect. At the same time, the technical solution of the present invention has good scalability and operability, and can meet the needs of thin film production enterprises of different sizes.

[0053] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thin film annealing device, characterized in that: The invention comprises a preheating component, an annealing component and a cooling component; the preheating component, the annealing component and the cooling component are connected to the equipment in sequence, the front end of the preheating component is provided with a first idle roller (2) and a second idle roller (3); the rear end of the cooling component is provided with a third idle roller (16); the film (1) is introduced through the first idle roller (2) and the second idle roller (3), is wound around the preheating component, the annealing component and the cooling component, and is led out from the third idle roller (16); A group of lower floating roller adjustment mechanisms (9) and a group of upper floating roller adjustment mechanisms (10) are respectively arranged between the preheating component and the annealing component, and between the annealing component and the cooling component.

2. The thin film annealing device according to claim 1, characterized in that: The preheating assembly comprises a first preheating roller (7) and a second preheating roller (8); the first preheating roller (7) and the second preheating roller (8) are rotatably connected to the device.

3. The thin film annealing device according to claim 2, characterized in that: The annealing assembly comprises a first annealing roller (11) and a second annealing roller (12); the first annealing roller (11) and the second annealing roller (12) are rotatably connected to the device; The first annealing roller (11) and the second annealing roller (12) are each provided with an infrared heating device (13).

4. The thin film annealing device according to claim 3, characterized in that: The cooling assembly comprises a first cooling roller (14) and a second cooling roller (15); the first cooling roller (14) and the second cooling roller (15) are rotatably connected to the device.

5. The thin film annealing device according to claim 4, characterized in that: It also includes multiple groups of pressure roller pressure adjustment components; one group of pressure roller pressure adjustment components is respectively provided at the first preheating roller (7), the second preheating roller (8), the first annealing roller (11), the second annealing roller (12), the first cooling roller (14) and the second cooling roller (15).

6. The thin film annealing device according to claim 5, characterized in that: The pressure roller pressure regulating assembly comprises a pressure roller pressure regulating cylinder (4), a pressure roller pressure regulating connecting rod (5) and a pressure roller (6); the middle portion of the pressure roller pressure regulating connecting rod (5) is rotatably connected to the device via a pin shaft, one end of the pressure roller pressure regulating connecting rod (5) is rotatably connected to the pressure roller pressure regulating cylinder (4), and the other end is rotatably connected to the pressure roller (6).

7. An annealing method for a thin film annealing device, characterized in that: The steps include: Step S1, preparation, equipment debugging and parameter setting; Step S2, annealing work, film conveying and annealing.

8. The annealing method of the thin film annealing device according to claim 8, characterized in that: The step S1, preparation work, equipment debugging and parameter setting includes: Step S11, select a polypropylene film with a thickness of 0.05 mm and a width of 1000 mm; check whether the various components of the film annealing equipment are operating normally; according to the characteristics of the polypropylene film, set the pressure of the pressure roller (6) to 5N, set the target tension value of the lower floating roller adjustment mechanism (9) and a group of upper floating roller adjustment mechanisms (10) to 8N, the annealing temperature of the first preheating roller (7), the second preheating roller (8), the first annealing roller (11) and the second annealing roller (12) to 150°C, the heating rate to 5°C / min, the holding time to 15 minutes, and the cooling rate of the first cooling roller (14) and the second cooling roller (15) to 10°C / s.

9. The annealing method of the thin film annealing device according to claim 8, characterized in that: The step S2, annealing work, film transport and annealing includes: Step S21, the film (1) is slowly conveyed to the annealing equipment through the first idle roller (2) and the second idle roller (3), and passes through the first preheating roller (7), the second preheating roller (8), the first annealing roller (11), the second annealing roller (12), the first cooling roller (14) and the second cooling roller (15) in sequence; and a plurality of pressure roller pressure adjustment components, a lower floating roller adjustment mechanism (9) and an upper floating roller adjustment mechanism (10); the first preheating roller (7), the second preheating roller (8), the first annealing roller (11) and the second annealing roller (12) start to work, and heat the film to 150° C. according to the set heating rate, and keep it for 1 5 minutes; during the annealing process, the pressure roller (6) always applies a pressure of 5N to the film (1) to ensure that the film (1) runs stably on the first annealing roller (11) and the second annealing roller (12); at the same time, the lower floating roller adjustment mechanism (9) and the upper floating roller adjustment mechanism (10) monitor the film tension in real time. When the tension fluctuates, the adjustment drive device quickly adjusts the position of the floating roller to stabilize the tension at about 8N; after the film completes annealing and heat preservation, it enters the cooling system and is quickly cooled to room temperature at a cooling rate of 10℃ / s, and then is led out by the third idle roller (16); finally, the cooled film is rolled up by the winding device.

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