High-efficiency PET film stretching production device

Abstract

The utility model discloses a kind of PET film efficient stretching production devices, including bottom plate, the top of the bottom plate is sequentially provided with compacting stretching mechanism, cooling mechanism, cross bracing wrinkle prevention mechanism and winding mechanism from right to left.The utility model uses the cooperation of water tank, conveying pipe, semiconductor refrigeration sheet, heat conducting plate and the like structure, effectively solve the problem of limited cooling area of traditional single cooling roller, low heat exchange efficiency.Semiconductor refrigeration sheet is directly cooled to the water in water tank, cooperate with multiple conveying pipes and direct the air cooled to the bottom of PET film, while heat conducting plate and PET film top adhere to radiate heat, form upper and lower two-way cooling, this design greatly improves cooling area and heat exchange efficiency, even in high-speed production state, PET film can also be realized fast, uniform cooling, reduce the performance degradation due to local temperature too high, guarantee setting effect and product quality, the device has the advantages of good cooling effect and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of PET film stretching technology, specifically to a high-efficiency PET film stretching production device. Background Technology

[0002] PET film is a well-rounded packaging film. It has good transparency and gloss; excellent airtightness and aroma retention; moderate moisture resistance, with moisture permeability decreasing at low temperatures. PET film possesses excellent mechanical properties; its toughness is the best among all thermoplastics, and its tensile strength and impact strength are much higher than ordinary films. It also has good stiffness and dimensional stability, making it suitable for secondary processing such as printing and paper bags. During PET film production, a stretching process is required. The utility model patent CN221717612U discloses a stretching device for PET film production. It solves the problem in existing film production stretching devices that, before winding the stretched film, use a cooling mechanism (3) to cool it. However, for film products, after stretching its length, its width will decrease, and the surface of the film will wrinkle due to stretching. In this case, directly cooling, shaping, and winding it would seriously affect the quality of subsequent products. The device uses an external PET film sandwiched between the lower and upper pressure rollers, passing through the cooling roller and the elastic rubber roller, and then winding it around the surface of the winding roller. By controlling the speed of the first and third servo motors, it achieves... The purpose of this patent is to stretch PET film and collect the stretched PET film by winding it around the surface of a take-up roller. By incorporating a cooling cross brace mechanism, after film stretching, a second servo motor drives an elastic rubber roller to rotate. Utilizing two opposing spiral patterns, the PET film is flattened from the center outwards, reducing width reduction and wrinkles. The flattened PET film adheres to the surface of a cooling roller, which cools and shapes it, ensuring flatness during subsequent winding. However, in practical use, this patent relies solely on a single cooling roller for film cooling and shaping. Limited by the cooling area and heat exchange efficiency, it struggles to achieve rapid and uniform cooling of PET film during high-speed production. This not only leads to untimely film cooling, affecting the shaping effect, but also risks deteriorating film performance due to localized overheating, ultimately negatively impacting product quality. Therefore, developing a PET film stretching production device capable of efficient cooling is a pressing technical problem in this field. Utility Model Content

[0003] To address the problems mentioned in the background art, the purpose of this utility model is to provide a high-efficiency PET film stretching production device with the advantages of good cooling effect and ease of use.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency PET film stretching production device, comprising a base plate, wherein a pressing and stretching mechanism, a cooling mechanism, a cross-bracing anti-wrinkle mechanism, and a winding mechanism are sequentially arranged from right to left on the top of the base plate; the cooling mechanism includes a water tank fixedly connected to the top of the base plate; a conveying pipe is fixedly connected inside the water tank; a partition is fixedly connected inside the water tank; the partition is fixedly connected to the conveying pipe; the number of conveying pipes is several; the air outlet of the conveying pipe extends to the top of the partition; a guide shroud is fixedly connected to the bottom of the water tank; air ducts are connected to both sides of the bottom of the guide shroud; a first fan is fixedly connected inside the air duct via a bracket; the air inlet of the conveying pipe extends to the bottom of the water tank and is located inside the guide shroud; semiconductor cooling chips are fixedly connected to both sides inside the water tank; the hot end of the semiconductor cooling chip extends to the outside of the water tank; the cold end of the semiconductor cooling chip extends to the inside of the water tank; a heat-conducting plate is hinged to the back of the top of the water tank; and guide rollers are rotatably connected to both sides of the water tank via brackets.

[0005] As a preferred embodiment of this invention, heat dissipation pipes are fixedly connected to both sides of the water tank, and a second fan is fixedly connected to the inside of the heat dissipation pipes via a bracket. The hot end of the semiconductor cooling chip is located inside the heat dissipation pipe.

[0006] As a preferred embodiment of this invention, a heat-conducting block is fixedly connected to the surface of the conveying pipe, and the number of heat-conducting blocks is several, and the heat-conducting blocks are evenly distributed on the surface of the conveying pipe.

[0007] As a preferred embodiment of this utility model, the heat-conducting plate is made of copper, and a heat dissipation fin is fixedly connected to the top of the heat-conducting plate. The number of heat dissipation fins is several, and an opening is provided on the surface of the heat dissipation fin. A heat-spreading rod is fixedly connected inside the opening, and a handle is fixedly connected to the front of the heat-conducting plate.

[0008] As a preferred embodiment of this utility model, stirring rods are rotatably connected to both sides inside the water tank, and motors are fixedly connected to both sides of the back of the water tank, with the output end of the motors fixedly connected to the stirring rods.

[0009] As a preferred embodiment of this utility model, dustproof nets are fixedly connected to the surfaces of the air inlet of the air duct, the air outlet of the conveying pipe, the air inlet of the heat dissipation pipe, and the air outlet of the heat dissipation pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model utilizes a combination of a water tank, conveying pipes, a semiconductor cooling chip, and a heat-conducting plate to effectively solve the problems of limited cooling area and low heat exchange efficiency of traditional single cooling rollers. The semiconductor cooling chip directly cools the water in the water tank, and multiple conveying pipes guide the cooled air to the bottom of the PET film. Simultaneously, the heat-conducting plate is attached to the top of the PET film for heat dissipation, forming bidirectional cooling from top to bottom. This design significantly improves the cooling area and heat exchange efficiency, enabling rapid and uniform cooling of the PET film even under high-speed production conditions. This reduces performance degradation caused by excessively high local temperatures, ensuring the setting effect and product quality. This device has the advantages of good cooling effect and ease of use.

[0011] 2. This invention utilizes heat dissipation pipes on both sides of the water tank and a second fan to specifically dissipate heat from the hot end of the thermoelectric cooler. During operation, the hot end of the thermoelectric cooler continuously generates heat; heat accumulation can severely impact its cooling efficiency. The heat dissipation pipes provide an independent space for the hot end to dissipate heat, and the second fan accelerates airflow within the pipes, quickly removing heat from the hot end and ensuring the thermoelectric cooler maintains a consistently high-efficiency cooling state. This design avoids a decrease in cooling capacity due to insufficient heat dissipation from the hot end, ensuring the cooling effect of the water in the tank and maintaining the temperature stability of the cold air blown out by the delivery pipe, thus providing reliable support for the continuous and efficient cooling of the PET film. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cooling mechanism of this utility model; Figure 3 This is a front sectional view of the water tank and flow guide structure of this utility model; Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0013] In the diagram: 1. Base plate; 2. Pressing and stretching mechanism; 3. Cooling mechanism; 4. Cross bracing anti-wrinkle mechanism; 5. Winding mechanism; 6. Water tank; 7. Conveying pipe; 8. Partition plate; 9. Flow guide; 10. Air duct; 11. Heat-conducting plate; 12. Guide roller; 13. Semiconductor cooling chip; 14. Heat dissipation pipe; 15. Heat dissipation fins; 16. Heat-spreading rod; 17. Heat-conducting block; 18. Stirring rod; 19. Dustproof net. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1 to 4 As shown, a high-efficiency PET film stretching production device includes a base plate 1. From right to left, a pressing and stretching mechanism 2, a cooling mechanism 3, a cross-bracing anti-wrinkle mechanism 4, and a winding mechanism 5 are sequentially arranged on the top of the base plate 1. The cooling mechanism 3 includes a water tank 6 fixedly connected to the top of the base plate 1. A conveying pipe 7 is fixedly connected inside the water tank 6, and a partition 8 is fixedly connected inside the water tank 6. The partition 8 is fixedly connected to the conveying pipe 7. There are several conveying pipes 7, and the air outlet of the conveying pipe 7 extends above the partition 8. A flow guide shroud 9 is fixedly connected to the bottom of the water tank 6 to guide the airflow. Both sides of the bottom of the cover 9 are connected to air ducts 10. A first fan is fixedly connected inside the air duct 10 via a bracket. The air inlet of the delivery pipe 7 extends to the bottom of the water tank 6 and is located inside the guide cover 9. Semiconductor cooling chips 13 are fixedly connected to both sides inside the water tank 6. The hot end of the semiconductor cooling chip 13 extends to the outside of the water tank 6, and the cold end of the semiconductor cooling chip 13 extends to the inside of the water tank 6. A heat-conducting plate 11 is hinged to the back of the top of the water tank 6. Guide rollers 12 are rotatably connected to both sides of the water tank 6 via brackets. Pressing and stretching mechanism 2 and cross bracing anti-wrinkle machine are also included. Mechanism 4 and winding mechanism 5 are similar in principle to the pressing and stretching mechanism 2, cross bracing mechanism and winding mechanism 5 mentioned in the utility model patent with publication number CN221717612U, which discloses a stretching device for PET film production, and achieve the same effect. This application will not elaborate further. The cross bracing anti-wrinkle mechanism 4 differs slightly from the cooling cross bracing mechanism in the comparative example. The cooling roller in the comparative example is replaced with a solid support roller in this device, eliminating its cooling function, but not affecting its anti-wrinkle function. Under the action of the first fan, the external... Air is drawn into the air duct 10, then into the air guide shroud 9, and then transported to the top of the water tank 6 through multiple delivery pipes 7, thereby blowing air onto the bottom of the film. It should be noted that the air force blown out by the delivery pipes 7 is not too strong, so as not to damage the PET film. The breeze blows the PET film upward, so that the top of the PET film is in contact with the bottom of the heat-conducting plate 11. The heat-conducting plate 11 can dissipate heat from the PET film on the one hand, and limit the PET film on the other hand to prevent damage to the PET film. At the same time, the bottom of the heat-conducting plate 11 is smooth.

[0016] refer to Figure 2Both sides of the water tank 6 are fixedly connected to heat dissipation pipes 14. A second fan is fixedly connected inside the heat dissipation pipes 14 by a bracket. The hot end of the semiconductor cooling chip 13 is located inside the heat dissipation pipes 14.

[0017] As a technical optimization of this utility model, the heat dissipation pipes 14 on both sides of the water tank 6 and the second fan are specifically designed to dissipate heat from the hot end of the thermoelectric cooler 13. When the thermoelectric cooler 13 is working, its hot end continuously generates heat; if this heat accumulates, it will severely affect its cooling efficiency. The heat dissipation pipes 14 provide an independent heat dissipation space for the hot end, and the second fan accelerates the airflow within the pipes, quickly removing heat from the hot end and ensuring that the thermoelectric cooler 13 always maintains a highly efficient cooling state. This design avoids a decrease in cooling capacity due to insufficient heat dissipation from the hot end, ensuring the cooling effect of the water in the water tank 6, thereby maintaining the temperature stability of the cold air blown out by the delivery pipe 7, and providing reliable support for the continuous and efficient cooling of the PET film.

[0018] refer to Figure 3 A heat-conducting block 17 is fixedly connected to the surface of the conveying pipe 7. There are several heat-conducting blocks 17, which are evenly distributed on the surface of the conveying pipe 7.

[0019] As a technical optimization of this utility model, the multiple heat-conducting blocks 17 on the surface of the conveying pipe 7 can significantly increase the contact area between the conveying pipe 7 and the cold water in the water tank 6, thereby accelerating the heat exchange rate. When air passes through the conveying pipe 7, the heat-conducting blocks 17 can more fully transfer the cold energy in the water tank 6 to the air inside the pipe, resulting in lower temperature and stronger cooling capacity of the blown-out cold air, thus ensuring the stability of the film performance after shaping.

[0020] refer to Figure 3 The heat-conducting plate 11 is made of copper. A heat dissipation fin 15 is fixedly connected to the top of the heat-conducting plate 11. There are several heat dissipation fins 15. An opening is opened on the surface of the heat dissipation fin 15. A heat-spreading rod 16 is fixedly connected inside the opening. A handle is fixedly connected to the front of the heat-conducting plate 11.

[0021] As a technical optimization of this utility model, the copper heat-conducting plate 11 has excellent thermal conductivity, which can quickly absorb heat from the surface of the PET film. The heat dissipation fins 15 on the top increase the contact area with air, and together with the heat dissipation rod 16, they accelerate heat diffusion and improve heat dissipation efficiency. The handle on the front facilitates opening and closing the heat-conducting plate 11. This structure not only enhances the heat dissipation effect at the top through close contact with the PET film, but also avoids heat accumulation through efficient heat dissipation components, ensuring the continuous and stable cooling capacity of the heat-conducting plate 11, and further improving the uniformity and reliability of PET film cooling and shaping.

[0022] refer to Figure 3Both sides of the inside of the water tank 6 are rotatably connected to stirring rods 18, and both sides of the back of the water tank 6 are fixedly connected to motors, with the output end of the motors fixedly connected to the stirring rods 18.

[0023] As a technical optimization of this utility model, the stirring rod 18 inside the water tank 6, driven by a motor, can break the static state of the water in the water tank 6, allowing for a uniform distribution of cold water. When the semiconductor cooling chip 13 is working, if the water is still, the water temperature near it will be lower, while the water temperature in areas further away will be higher, resulting in uneven cooling. The stirring rod 18 drives the water flow to circulate, ensuring that the water temperature in all areas of the water tank 6 remains consistent, and ensuring that the air drawn in by the multiple delivery pipes 7 can be cooled evenly. This design avoids localized cooling differences in the PET film caused by uneven water temperature, resulting in more uniform performance of all parts of the cooled PET film, reducing wrinkles or deformation caused by uneven cooling, and improving product quality stability.

[0024] refer to Figure 4 Dustproof nets 19 are fixedly connected to the surfaces of the air inlet of the air duct 10, the air outlet of the conveying pipe 7, the air inlet of the heat dissipation pipe 14, and the air outlet of the heat dissipation pipe 14.

[0025] As a technical optimization of this utility model, the dustproof nets 19 at the air inlets and outlets of the air duct 10, conveying pipe 7, and heat dissipation pipe 14 effectively prevent external dust and impurities from entering the equipment. If the air drawn in by the air duct 10 contains dust, it will adhere to the inner wall of the first fan or conveying pipe 7, affecting air circulation and heat exchange efficiency; dust entering the heat dissipation pipe 14 may clog the pipe, reducing the heat dissipation effect of the hot end of the semiconductor cooling chip 13; dust at the air outlet of the conveying pipe 7 may also directly contaminate the surface of the PET film. The dustproof nets 19 reduce the wear and clogging of equipment components by dust, extend the service life of the equipment, and at the same time prevent dust from contaminating the film, ensuring the appearance and performance of the product, and reducing the frequency and cost of subsequent cleaning and maintenance.

[0026] The working principle and usage process of this utility model are as follows: When using this high-efficiency PET film stretching production device, firstly, check whether each mechanism is installed in place, ensuring that the base plate 1 is placed stably and all components are firmly connected. Then, connect the device to the power supply, start the semiconductor cooling chip 13 to cool the water in the water tank 6, and simultaneously turn on the second fan to allow airflow within the heat dissipation pipe 14, helping to dissipate heat from the hot end of the semiconductor cooling chip 13 and ensuring stable cooling efficiency. Next, start the motor to drive the stirring rod 18 to rotate within the water tank 6, ensuring uniform cooling of the water in the tank 6 and avoiding localized temperature differences that could affect the cooling effect. After the preparation is completed, the PET film to be processed is passed through the pressing and stretching mechanism 2, cooling mechanism 3, cross bracing anti-wrinkle mechanism 4 and winding mechanism 5 from right to left. The pressing and stretching mechanism 2 presses the PET film. By controlling the feeding speed of the pressing and stretching mechanism 2 and the winding speed of the winding mechanism 5, the PET film is stretched. During the stretching process, the feeding speed of the pressing and stretching mechanism 2 is kept less than the winding speed of the winding mechanism 5, thereby realizing the stretching processing of the PET film. When the PET film enters the cooling mechanism 3, the first fan is turned on. External air enters the air guide shroud 9 through the air duct 10 and is then conveyed upward through multiple conveying pipes 7. The heat-conducting blocks 17 on the surface of the conveying pipes 7 come into full contact with the cold water in the water tank 6, so that the air inside the pipe is cooled. The cooled air is blown from the air outlet of the conveying pipes 7 to the bottom of the PET film. At the same time, the top of the PET film is in contact with the heat-conducting plate 11. The copper heat-conducting plate 11 quickly absorbs the heat of the PET film and then dissipates the heat into the air through the heat dissipation fins 15 and the heat-spreading rod 16 on the top, forming a two-way cooling effect. The guide roller 12 ensures that the PET film moves smoothly during the cooling process. After cooling, the PET film enters the cross-bracing anti-wrinkle mechanism 4, which further refines the film to prevent wrinkles and ensures it remains flat. By rotating an elastic rubber roller, two spirals rotating in opposite directions are driven to flatten the PET film from the center to both sides, reducing the reduction in the width of the PET film and the occurrence of wrinkles. Finally, the processed PET film is conveyed to the winding mechanism 5, where it is wound up to complete the entire production process.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency stretching production apparatus for PET film, comprising a base plate (1), characterized in that: The top of the base plate (1) is provided with a pressing and stretching mechanism (2), a cooling mechanism (3), a cross bracing anti-wrinkle mechanism (4), and a winding mechanism (5) from right to left. The cooling mechanism (3) includes a water tank (6) fixedly connected to the top of the base plate (1). A conveying pipe (7) is fixedly connected inside the water tank (6). A partition (8) is fixedly connected inside the water tank (6). The partition (8) is fixedly connected to the conveying pipe (7). There are several conveying pipes (7). The air outlet of the conveying pipe (7) extends to the top of the partition (8). A guide shroud (9) is fixedly connected to the bottom of the water tank (6). (9) Both sides of the bottom are connected to the air duct (10). The air duct (10) is fixedly connected to the first fan by the bracket. The air inlet of the conveying pipe (7) extends to the bottom of the water tank (6) and is located inside the guide shroud (9). Both sides of the inside of the water tank (6) are fixedly connected to the semiconductor cooling chip (13). The hot end of the semiconductor cooling chip (13) extends to the outside of the water tank (6). The cold end of the semiconductor cooling chip (13) extends to the inside of the water tank (6). The back of the top of the water tank (6) is hinged to the heat conduction plate (11). Both sides of the water tank (6) are rotatably connected to the guide roller (12) by the bracket.

2. The high-efficiency stretching production apparatus for PET film according to claim 1, characterized in that: Both sides of the water tank (6) are fixedly connected to heat dissipation pipes (14), and a second fan is fixedly connected inside the heat dissipation pipes (14) by a bracket. The hot end of the semiconductor cooling chip (13) is located inside the heat dissipation pipes (14).

3. The high-efficiency stretching production apparatus for PET film according to claim 2, characterized in that: A heat-conducting block (17) is fixedly connected to the surface of the conveying pipe (7). There are several heat-conducting blocks (17), and the heat-conducting blocks (17) are evenly distributed on the surface of the conveying pipe (7).

4. The high-efficiency stretching production apparatus for PET film according to claim 3, characterized in that: The heat-conducting plate (11) is made of copper. A heat dissipation fin (15) is fixedly connected to the top of the heat-conducting plate (11). There are several heat dissipation fins (15). An opening is provided on the surface of the heat dissipation fin (15). A heat-spreading rod (16) is fixedly connected inside the opening. A handle is fixedly connected to the front of the heat-conducting plate (11).

5. The high-efficiency stretching production apparatus for PET film according to claim 4, characterized in that: Stirring rods (18) are rotatably connected to both sides inside the water tank (6), and motors are fixedly connected to both sides of the back of the water tank (6). The output end of the motor is fixedly connected to the stirring rods (18).

6. The high-efficiency stretching production apparatus for PET film according to claim 5, characterized in that: Dustproof nets (19) are fixedly connected to the surfaces of the air inlet of the air duct (10), the air outlet of the conveying pipe (7), the air inlet of the heat dissipation pipe (14), and the air outlet of the heat dissipation pipe (14).

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