Air isolation device and drying oven of plastic film stretching equipment

Abstract

The utility model discloses an air isolation device, which is used for isolating a temperature interval of a drying oven and comprises a plurality of partition plates, a plurality of air inlets and a plurality of air outlets, the air return plate is arc-shaped, and the first end of the air return plate is fixedly connected with the bottom end of the partition plate; the air cutting plate is connected with the second end of the air return plate, the air cutting plate faces the air return plate and forms an angle with the horizontal plane where the second end of the air return plate is located, the air cutting plate and the air return plate form a compression duct, an air outlet is formed in the connecting position of the air cutting plate and the second end of the air return plate, and convection air flows out of the air outlet after passing through the duct when flowing in the preset direction. The effect of effectively isolating air in each heating section can be achieved, the temperature stability and uniformity of the drying oven sections are improved, the stretching quality of film products is improved, the higher the production line speed is, the better the air isolation effect is, and the production requirement for air isolation of the drying oven sections is met. The utility model further provides a drying oven of the plastic film stretching equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of plastic production equipment, especially to air isolation device and plastic film stretching equipment oven. BACKGROUND

[0002] With the increasing of film process standards, domestic and foreign film production line manufacturers continuously innovate and develop biaxially oriented film production lines, and many changes have occurred in the film forming process. The increase of production speed increases the output of the film, but the performance of the film is limited, and the transmission speed and precision of the control system also need to be continuously upgraded. The film stretching equipment oven for manufacturing plastic film is divided into different heating sections, and there are different temperatures in these different heating sections. Each heating section is used for temperature adjustment of the plastic film. On the one hand, the temperature adjustment of the plastic film gives the plastic film certain properties, and on the other hand, through the temperature adjustment of the plastic film, it can be stretched in the process, that is, stretched (in the longitudinal and / or transverse direction). The film stretching equipment includes a plurality of ventilation modules, which are arranged at intervals along the transportation direction of the plastic film, that is, along the extraction direction.

[0003] In the prior art, the bottom between the heating sections of the stretching equipment oven needs to reserve space for the film to run. When the plastic film runs through different heating sections in the stretching equipment oven, it drives the air in different heating sections to flow through the gap, which destroys the stability and uniformity of the temperature in different heating sections, so that the temperature in each heating section cannot reach the preset temperature. In order to maintain the temperature of each heating section, the power of the heating equipment in each heating section of the oven needs to be adjusted constantly to achieve balance, which increases the power consumption of the oven, increases the use cost, and shortens the service life of the equipment. SUMMARY

[0004] The utility model discloses a kind of air isolation devices and plastic film stretching equipment oven, can realize the effect of each heating section air effective isolation, improve oven section temperature stability and uniformity, improve film product stretching quality, and air isolation effect is better with faster production line speed, adapt to the production requirement of high-speed double film oven section air isolation.

[0005] To solve the above technical problems, the embodiment of the utility model discloses an air isolation device for isolating the temperature interval of an oven, comprising:

[0006] a plurality of partitions, a mounting hole is formed in the top of the partition, the partition is fixedly installed in the oven through the mounting hole, in the vertical direction, the plurality of partitions separate the temperature intervals of the oven into a plurality of heating sections, and the partition is used for blocking the convection air between the heating sections;

[0007] a return air baffle, which is arc-shaped, a first end of the return air baffle is fixedly connected to the bottom end of the partition, and the return air baffle is used for guiding the convection air to flow in a preset direction;

[0008] a cutting air baffle, which is connected to the second end of the return air baffle, the cutting air baffle is arranged at an angle towards the second end of the return air baffle and a horizontal plane where the second end of the return air baffle is located, the cutting air baffle and the return air baffle form a compression duct, and a discharge opening is formed at the connection between the cutting air baffle and the second end of the return air baffle, and the convection air flows out of the discharge opening after passing through the duct in the preset direction.

[0009] The above technical scheme can achieve the effect of effectively isolating the air in each heating section, improve the temperature stability and uniformity of the oven section, improve the stretching quality of the film product, and the faster the production line speed, the better the air isolation effect, thereby meeting the production requirements of the air isolation of the high-speed double-stretching film oven section.

[0010] According to another specific embodiment of the present application, the embodiment of the present application discloses that the partition is bent at an angle with respect to the vertical direction near the bottom end, and the first end of the return air baffle is abuttingly fixed to the bent portion of the partition.

[0011] According to another specific embodiment of the present application, the embodiment of the present application discloses that the bending angle of the bent portion of the partition ranges from 0 to 90 degrees.

[0012] According to another specific embodiment of the present application, the embodiment of the present application discloses that a plurality of discharge openings are arranged at the connection between the cutting air baffle and the second end of the return air baffle in the horizontal direction.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses that the length of the discharge opening ranges from 10 to 200 mm, and the width ranges from 5 to 10 mm.

[0014] According to another specific embodiment of the present application, the embodiment of the present application discloses that the return air baffle is arranged in a circular arc shape, and the bending radius is 3-10 mm.

[0015] According to another specific embodiment of the present application, the embodiment of the present application discloses that the included angle between the cutting air baffle and the return air baffle is 10-80 degrees.

[0016] According to another specific embodiment of the present application, the bottom end of the baffle plate and the first end of the return air plate are respectively provided with corresponding threaded holes, and the bottom end of the baffle plate and the first end of the return air plate are fixedly connected by a bolt penetrating through the two threaded holes.

[0017] The embodiment of the present application further discloses a plastic film stretching equipment oven for temperature adjustment of a film, which comprises a box body structure, a plurality of heating zones are arranged in the box body structure, the film passes through the bottom of the plurality of heating zones, and the air isolation device in the specification is arranged between the heating zones.

[0018] According to another specific embodiment of the present application, the embodiment of the present application discloses that the distance between the lowest end of the bottom end of the return air plate and the film is 1-2 cm.

[0019] The application has the advantages that: the application realizes the effect of effective air isolation of each heating zone, improves the temperature stability and uniformity of the oven section, improves the stretching quality of the film product, and the faster the production line speed, the better the air isolation effect, and the production requirement of high-speed double-stretching film oven section air isolation is met. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure of the air isolation device is shown Figure 1 ;

[0021] Figure 2 The structure of the air isolation device is shown Figure 2 ;

[0022] Figure 3 The structure of the air isolation device is shown Figure 3 . DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0025] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product is usually placed, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0026] The terms "first", "second", etc. are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0029] With reference to Figures 1 to 3 , the present application provides an air isolation device for isolating the temperature interval of an oven, comprising: a partition plate 1, a return air plate 2 and a wind cutting plate 3, a plurality of partition plates 1, a mounting hole is formed in the top of the partition plate 1, the partition plate 1 is fixedly installed in the oven through the mounting hole, along the vertical direction, the plurality of partition plates 1 interval the temperature interval of the oven into a plurality of heating sections, the partition plate 1 is used for blocking the convection air between the heating sections; the return air plate 2 is arc-shaped, the first end of the return air plate 2 is fixedly connected with the bottom end of the partition plate 1, the return air plate 2 is used for guiding the convection air to flow along the preset direction; the wind cutting plate 3 is connected with the second end of the return air plate 2, the wind cutting plate 3 is arranged towards the return air plate 2 and at an angle with the horizontal plane where the second end of the return air plate 2 is located, the wind cutting plate 3 and the return air plate 2 form a compression tunnel, an air outlet 4 is formed at the connection between the wind cutting plate 3 and the second end of the return air plate 2, the convection air flows out from the air outlet 4 after passing through the tunnel along the preset direction.

[0030] In this embodiment, the partition 1 serves as a partition structure for the heating section inside the oven, and its top end is along the vertical direction ( Figure 1 As shown in the Y-direction, the partition 1 is fixed to the oven, providing a stable physical partition for the internal space of the oven. This fixing method ensures the positional stability of the partition 1 under high-temperature conditions, effectively preventing large-scale lateral convection of air between different heating sections, reducing disordered heat transfer between sections, and enabling each heating section to independently maintain its set temperature range, thereby ensuring temperature stability. For example, when multi-section heating of the film is performed at different temperatures, the partition 1 can prevent the random movement of hot air, avoiding temperature fluctuations in one section due to the influence of other sections, thus improving the accuracy of temperature control during the film heating process of the entire oven.

[0031] Figure 1 In the middle, the direction of air flow is as follows Figure 1 As shown in the S-direction, the arc-shaped return air plate 2 has a unique airflow guiding advantage. When the film moves inside the oven, the air it carries flows orderly from the first end to the second end along the arc-shaped surface of the return air plate 2. This arc-shaped guiding effect organizes the originally chaotic airflow, giving it directionality and consistency. On the one hand, it prevents the air carried by the film from spreading throughout the oven and interfering with the temperature field of other heating sections; on the other hand, by concentrating and guiding the airflow in a specific direction, it lays the foundation for the subsequent coordinated formation of a duct and airflow wall by the air cutter plate 3 and the return air plate 2. At the same time, during the airflow guiding process, the arc-shaped return air plate 2, due to its curved surface characteristics, can reduce airflow resistance and turbulence compared to a planar structure, making the airflow on its surface smoother and more efficient, which helps to improve the stability and efficiency of the entire air circulation system inside the oven.

[0032] The cutting air plate 3 is arranged at an angle with the horizontal plane where the second end of the return air plate 2 is located and together forms a gradually narrowing duct. This ingenious design makes good use of the principle of aerodynamics. When the air driven by the film is guided along the arc surface of the return air plate 2 to the second end, the duct between the cutting air plate 3 and the return air plate 2 compresses and accelerates the airflow. As the duct gradually narrows, the airflow speed increases and the pressure increases, eventually forming a wind wall with certain intensity and stability at the air outlet 4. This wind wall not only effectively blocks the wind driven by the film from spreading to the next heating section, but also adapts to the production requirements of air isolation in the film stretching oven section. In addition, the specific angle arrangement of the cutting air plate 3 and the return air plate 2 can effectively adjust and control the airflow in different directions and speeds, ensuring that the wind wall blown out of the air outlet 4 in shape, intensity and position can accurately meet the blocking requirements, further improving the reliability and stability of air isolation in the oven, and ensuring the uniformity of the temperature of each heating section is not affected by the airflow during the movement of the film, thereby improving the stretching quality of the film product.

[0033] The present application achieves the effect of air isolation in each heating section, improves the stability and uniformity of the oven section temperature, improves the stretching quality of the film product, and the faster the production line speed, the better the air isolation effect, which meets the production requirements of air isolation in the high-speed double film stretching oven section.

[0034] In the present application, the partition plate 1 is made of high-temperature-resistant and corrosion-resistant thermal insulation materials, such as aluminum silicate fiber thermal insulation plate or metal sandwich thermal insulation plate, with a thickness range of 2-5mm to ensure the structural strength and stability in the oven environment. The top of the partition plate 1 is provided with a waist-shaped hole 5. The design of the waist-shaped hole 5 can adjust the fixed distance between the partition plate 1 and the oven according to the distance between the partition plate 1 and the film. The return air plate 2 is made of the same or matched high-temperature-resistant material as the partition plate 1 in a circular arc shape, which is formed by precise die stamping or bending process to ensure the consistency and accuracy of the circular arc shape, so as to achieve good return air effect and guide smooth airflow.

[0035] In an implementable embodiment, the partition plate 1 is bent at an angle with the vertical direction near the bottom end, and the first end of the return air plate 2 is fixedly connected with the bent part of the partition plate 1. The first end of the return air plate 2 is parallel to and fixedly connected with the bent part of the partition plate 1, so that the connection between the return air plate 2 and the partition plate 1 is more firm. The bending angle of the bent part of the partition plate 1 ranges from 0 to 90 degrees.

[0036] In this embodiment, the partition plate 1 is bent at an angle close to the bottom end, and the first end of the return air plate 2 is parallel to and fixedly connected to the bent part of the partition plate 1. The parallel connection between the return air plate 2 and the partition plate 1 increases the contact area between them, so that the stress borne by the connection point can be more evenly distributed on the contact surface. Compared with simple point contact or small area contact connection method, it can effectively reduce the risk of structural damage caused by local stress concentration at the connection part. During the long-term operation of the oven, the thermal expansion and contraction effect caused by internal temperature changes, as well as the slight vibration that may occur during equipment operation, will all exert forces on the structural parts. This large-area parallel abutting and fixing method provides a stable "support base" for the connection part, which can better resist the influence of these external forces and ensure the integrity and stability of the entire structure, thereby ensuring that the space division of each heating section in the oven remains accurate and stable, providing a continuous and reliable structural foundation for the temperature stability and uniformity of each heating section, and indirectly ensuring the consistency of the film product stretching quality.

[0037] When the oven is in operation, air flows between the heating sections and the structural parts. If there are gaps or irregular shapes at the connection part, it is easy to cause turbulent flow, vortex and other unstable flow phenomena at these locations, which will affect the uniform distribution of heat and the air isolation effect. The close parallel abutting and fixing of the return air plate 2 and the bent part of the partition plate 1 allows the air to transition more smoothly when passing through this area, reducing unnecessary energy loss and air flow interference, which helps to maintain the efficiency and stability of the entire oven internal air flow system, further improving the air isolation effect between the heating sections, ensuring that each heating section can be independently and accurately controlled, meeting the strict requirements of different heating stages in the film production process, and helping to improve the stretching quality of the film product and meet the challenges of equipment stability and process precision under high-speed production conditions.

[0038] The partition plate 1 is bent near the bottom end, and the bending angle can be accurately adjusted between 0-90 degrees, for example, using a numerical control bending machine to ensure the flatness and precision of the bent part, so that the return air plate 2 can be tightly abutted and fixed. The bent part can be appropriately rounded with a radius of 1-3 mm to reduce stress concentration.

[0039] In an implementable embodiment, the air blowing port 4 is provided with multiple air blowing ports 4, which are arranged at equal intervals along the horizontal direction (indicated by the X direction). Figure 1 The multiple air blowing ports 4 are arranged at the connection between the air cutting plate 3 and the second end of the return air plate 2.

[0040] In this embodiment, the air blowing ports 4 are arranged at equal intervals along the horizontal direction at the connection between the air cutting plate 3 and the air return plate 2. The length of the air blowing port 4 ranges from 10 to 200 mm, and the width ranges from 5 to 10 mm. Laser cutting or numerical control stamping process is adopted to process the air blowing port 4, so as to ensure the dimensional accuracy and edge smoothness of the air blowing port 4, and reduce the air flow resistance and noise.

[0041] The multiple air blowing ports 4 arranged at equal intervals along the horizontal direction can make the air wall blown out of the duct formed by the air return plate 2 and the air cutting plate 3 more evenly distributed in the horizontal direction. For the air flow driven by the film at different positions in the oven, the uniformly distributed air blowing ports 4 can provide omnidirectional and consistent blocking effect. Whether the air is driven by the edge or the center area of the film, it can be effectively intercepted to avoid air leakage and disturbance in local areas due to weak air wall, thereby ensuring the comprehensiveness and reliability of air isolation between each heating section, and ensuring the stability and uniformity of the temperature field in the entire oven are not disturbed by the air flow driven by the film movement, which plays a key role in improving the stretching quality consistency of the film product in the entire width direction.

[0042] The moving speed of the film at different positions in the oven may have slight differences, and the air blowing ports 4 arranged at equal intervals can adaptively block the air flow of different flow rates. For example, the speed of the film near the transmission roller shaft of the oven may change slightly due to friction, and the uniformly distributed air blowing ports 4 can flexibly respond to these changes and always maintain stable air isolation effect, further reflecting the adaptability of this design to complex production conditions and effectively meeting the air isolation needs of the high-speed double-stretching film oven under different process conditions.

[0043] The length of the air blowing port 4 ranges from 10 to 200 mm, and the width ranges from 5 to 10 mm, which can ensure sufficient air wall coverage area while avoiding uneven air wall strength or local collapse due to excessive length. For example, shorter air blowing ports 4 can form high-strength air columns in local areas, and multiple short air blowing ports 4 can be combined to form a continuous and stable air wall, effectively dealing with different sizes of air flow groups driven by the film. Longer air blowing ports 4 can be used to handle large-area, low-flow air flow disturbance. By adjusting the combination of air blowing ports 4 of different lengths, the best air isolation effect can be achieved by flexibly configuring according to the width of the film, the moving speed, and the internal space layout of the oven, etc. in actual production, and the precision control ability of the temperature environment during the stretching process of the film product is improved.

[0044] The width of the design is 5-10mm, which helps to control the thickness and flow rate of the wind wall. The narrower width makes the blown air flow have a higher speed and pressure, which can form a more compact wind wall and enhance the barrier ability of the film-driven air flow. Moreover, this relatively narrow air outlet 4 can reduce unnecessary air flow output, reduce the load of the air circulation system inside the oven, improve energy utilization efficiency, and also avoid the hindering of other normal air flow paths in the oven due to the over-thick wind wall, which is conducive to maintaining the balance and stability of the aerodynamic environment in the entire oven, ensuring the orderly progress of heat exchange and temperature control in each heating section.

[0045] In an implementable embodiment, the air return plate 2 is arranged in a circular arc shape with a bending radius of 3-10mm. The included angle between the air cutting plate 3 and the air return plate 2 is 10-80 degrees.

[0046] In this embodiment, the air return plate 2 is in a circular arc shape with a bending radius of 3-10mm, which makes the air return plate 2 have good air guiding performance. A smaller bending radius helps to quickly change the direction of the air flow in a limited space and guide the film-driven wind to flow smoothly along the arc surface. For example, when the air flow generated by the high-speed movement of the film hits the air return plate 2, the circular arc structure can guide the air flow to the direction of the air cutting plate 3 with less resistance, avoiding turbulence or backflow phenomenon caused by sudden turning of the air flow, ensuring the stability and orderliness of the air flow.

[0047] The appropriate bending radius range balances the structural strength and aerodynamic performance of the air return plate 2. A smaller radius increases the structural rigidity of the air return plate 2, making it less likely to deform in the high-temperature and high-air-flow-impact oven environment, so it can stably play a guiding role for a long time. At the same time, this range of radius can also ensure that the air flow can be effectively guided under different film production process conditions, such as different film thickness, width and moving speed, etc., improving the adaptability of the equipment to various production conditions, further ensuring the stability of the air isolation effect of each heating section, and helping to improve the consistency of the stretching quality of the film products.

[0048] The included angle between the air cutting plate 3 and the air return plate 2 is determined according to the speed of the film movement, when the film flow rate is low and the flow is small, the included angle between the air cutting plate 3 and the air return plate 2 can be selected to be small, the airflow can be gradually accelerated and compressed in the duct, and finally a stable and uniform air wall is formed, avoiding airflow turbulence caused by excessive compression and affecting the quality of the air wall. For some thin film products that are sensitive to temperature changes and require fine production process, this small angle setting can provide a more gentle and accurate air barrier effect, which is beneficial to accurately control the temperature environment of each heating section and improve the quality of the thin film product. When the flow rate of the film is large and the flow of the film is large, the contraction of the duct required is more drastic, and the included angle between the air cutting plate 3 and the air return plate 2 needs to be large. The fast movement of the film will generate strong airflow disturbance, and the large included angle can quickly compress and accelerate these airflows to form a high-strength air wall, effectively preventing airflow from interfering with other heating sections. The oven adjusts the formation mechanism of the air wall according to actual production needs, whether it is low-speed high-precision production or high-speed large-scale production, it can achieve good air isolation effect, significantly improve the versatility and adaptability of the equipment, and meet the strict requirements of different thin film product production processes on the air isolation of the oven, thereby laying a solid foundation for improving the stretching quality and production efficiency of the thin film product.

[0049] In an implementable embodiment, the bottom end of the partition plate 1 and the first end of the air return plate 2 are respectively provided with corresponding threaded holes, and the bottom end of the partition plate 1 and the first end of the air return plate 2 are fixedly connected by a bolt 6 penetrating the two threaded holes.

[0050] In this embodiment, threaded holes are machined at the bottom end of the partition plate 1 according to design requirements, the thread specification can be selected as M4-M8, and the thread depth is 5-10mm, to ensure the reliability and stability of the bolt 6 connection.

[0051] The embodiment of the utility model further discloses a plastic film stretching equipment oven for temperature adjustment of the film, which comprises a box body structure, a plurality of heating zones are arranged in the box body structure, the film passes through the bottom of the plurality of heating zones, and the air isolation device in the above description is arranged between the heating zones. The distance between the lowest end of the bottom end of the air return plate 2 and the film is 1-2cm.

[0052] In this embodiment, the distance between the lowest end of the bottom end of the air return plate 2 and the film is 1-2 cm, which can ensure that the air brought by the film movement can be efficiently captured and guided by the air return plate 2. Due to the close distance, the energy loss of the airflow during the transmission from the film surface to the air return plate 2 is very small, and the airflow can enter the air return plate 2 in a relatively stable state, so that the guiding effect of the air return plate 2 on the airflow is more direct and effective. In the high-speed production process, if the airflow generated by the rapid movement of the film cannot be effectively guided in time, it may form a turbulent flow in the oven, and such a close distance setting can effectively prevent such a situation from occurring, ensuring the orderly flow of the airflow and the stability of the subsequent air wall. The distance between the lowest end of the bottom end of the air return plate 2 and the film is 1-2 cm, which helps to reduce the loss or uneven distribution of heat in the area between the film and the air return plate 2. The residence time of hot air in this narrow space is relatively short, which can be more quickly guided by the air return plate 2 to a specific direction for recycling or isolation treatment, avoiding temperature fluctuations caused by excessive accumulation or loss of heat in the local area, thereby improving the stability and uniformity of the temperature of each heating zone, providing a more precise temperature adjustment environment for the film, and helping to improve the stretching quality of the film product.

[0053] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is a further detailed description of the present application in conjunction with specific embodiments, and cannot be regarded as a limitation of the specific implementation of the present application. Those skilled in the art can make various changes in form and details without departing from the spirit and scope of the present application, including making a number of simple deductions or substitutions.

Claims

1. An air isolation device for isolating temperature zones of an oven, characterized in that, The utility model relates to an air isolation device for thin film drying oven, comprising: a plurality of partitions, the top of which is provided with mounting holes, the partitions are fixedly installed in the oven through the mounting holes, and the plurality of partitions separate the temperature intervals of the oven into a plurality of heating sections in the vertical direction, and the partitions are used for blocking the convection air between the heating sections; a return air baffle in an arc shape, a first end of the return air baffle is fixedly connected to the bottom end of the partition, and the return air baffle is used for guiding the convection air to flow in a preset direction; a cutting air baffle connected to the second end of the return air baffle, the cutting air baffle is arranged towards the return air baffle and at an angle to the horizontal plane where the second end of the return air baffle is located, the cutting air baffle and the return air baffle form a compression duct, and the connection between the cutting air baffle and the second end of the return air baffle is provided with an air outlet, and the convection air flows out of the air outlet after passing through the duct in the preset direction.

2. The air isolation device of claim 1, wherein, The partition is bent at an angle to the vertical direction near the bottom end, and the first end of the return air baffle is fixedly connected to the bent portion of the partition.

3. The air isolation device of claim 2, wherein, The bending angle of the bent portion of the partition ranges from 0 to 90 degrees.

4. The air isolation device of claim 1, wherein, The air outlet is provided with a plurality of air outlets, which are arranged at equal intervals in the horizontal direction at the connection between the cutting air baffle and the second end of the return air baffle.

5. The air isolation device of claim 1, wherein, The length of the air outlet ranges from 10 to 200 mm, and the width ranges from 5 to 10 mm.

6. The air isolation device of claim 1, wherein, The return air baffle is arranged in a circular arc shape, and the bending radius ranges from 3 to 10 mm.

7. The air isolation device of claim 1, wherein, The included angle between the cutting air baffle and the return air baffle ranges from 10 to 80 degrees.

8. The air isolation device of claim 1, wherein, The bottom end of the partition and the first end of the return air baffle are respectively provided with corresponding threaded holes, and the bottom end of the partition and the first end of the return air baffle are fixedly connected by a bolt penetrating through the two threaded holes.

9. A plastic film stretching apparatus oven for temperature conditioning of a film, characterized by, The utility model relates to an air isolation device for thin film drying oven, comprising:

10. The plastic film stretching apparatus oven of claim 9, wherein, The distance between the lowest end of the bottom end of the return air baffle and the thin film ranges from 1 to 2 cm.

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