A drying apparatus for PET film production

Abstract

This utility model relates to the field of PET film production technology, specifically disclosing a drying device for PET film production, including a drying chamber. Two symmetrically distributed partitions are fixedly connected inside the drying chamber, dividing it into a preheating zone, a drying zone, and a slow cooling zone from top to bottom. Multiple guide rollers are rotatably connected inside the drying chamber, and the film material is arranged in an S-shape by the guide rollers. Drying mechanisms are provided inside the preheating zone, drying zone, and slow cooling zone. Each drying mechanism includes a U-shaped air cavity, with multiple evenly distributed air holes on both the upper and lower end faces of the U-shaped air cavity. Slider blocks are fixedly connected to both the upper and lower end faces of the U-shaped air cavity. Through the multi-temperature zone segmented drying structure and the reciprocating uniform air delivery mechanism, sudden heating and cooling during the film material drying process are effectively avoided, ensuring that hot air acts evenly on both sides of the film material, significantly reducing bubbles and warping defects, and improving drying efficiency.

Description

Technical Field

[0001] This utility model relates to the field of PET film production technology, and specifically discloses a drying device for PET film production. Background Technology

[0002] PET film, or polyester film, is a type of packaging film with comprehensive performance. PET film has many excellent properties, and its production process requires the use of drying equipment for drying.

[0003] Chinese patent CN220261705U discloses a drying device for PET film production, including a base plate, a support frame at the top of the base plate, a drying chamber at the top of the support frame, pre-reserved slots at the middle positions of both sides inside the drying chamber, a dryer at the rear end of one side of the top of the drying chamber, and an air guide hood at the output end of the dryer. An adjustment structure is provided between the other end of the drying nozzle and both ends inside the drying chamber. During use, rotating the adjustment turntable adjusts the length of the adjustment rod passing through the slot via a threaded connection, thereby adjusting the position of the drying nozzle inside the drying chamber. Simultaneously, a stabilizing guide rod rises and falls within the slot to stabilize the drying nozzle, thus achieving convenient, quick, and stable adjustment of the drying nozzle spacing. This allows the drying device to adjust the degree of drying of the PET film according to drying requirements, making it highly feasible.

[0004] The aforementioned document discloses a drying device for PET film production that uses a single temperature zone, which easily leads to uneven thermal stress in the film material during drying, resulting in defects such as bubbles and warping. Therefore, a drying device for PET film production is needed to solve this problem. Utility Model Content

[0005] This invention proposes a drying device for PET film production. Through a multi-temperature zone segmented drying structure and a reciprocating uniform air supply mechanism, it effectively avoids the phenomenon of sudden heating and cooling during the film material drying process, so that hot air is evenly applied to the upper and lower sides of the film material, significantly reducing bubbles and warping defects and improving drying efficiency.

[0006] This invention is implemented as follows: a drying device for PET film production includes a drying chamber. Two symmetrically distributed partitions are fixedly connected inside the drying chamber, dividing it into a preheating zone, a drying zone, and a slow cooling zone from top to bottom. Multiple guide rollers are rotatably connected inside the drying chamber, and the film material is arranged in an S-shape by these rollers. Drying mechanisms are provided inside the preheating zone, drying zone, and slow cooling zone. Each drying mechanism includes a U-shaped air cavity. Multiple evenly distributed air holes are opened on the upper and lower end faces of the U-shaped air cavity. Slider blocks are fixedly connected to the upper and lower end faces of the U-shaped air cavity. Three lead screws are rotatably connected between the front and rear end faces inside the drying chamber. The three sliders on the upper side are threadedly connected to the three lead screws. Three hot air blowers are installed on the rear end face of the drying chamber. The air outlets of the three hot air blowers are connected to connecting pipes extending into the drying chamber. The other ends of the three connecting pipes are respectively connected to the three U-shaped air cavities.

[0007] As a preferred embodiment of the drying device for PET film production according to this utility model, the front end of the middle lead screw extends to the outside of the drying chamber and is fixedly connected to a double-groove synchronous pulley, and the front ends of the other two lead screws also extend to the outside of the drying chamber and are fixedly connected to single-groove synchronous pulleys. The double-groove synchronous pulley and the two single-groove synchronous pulleys are all connected by synchronous belt drive. A servo motor with its output end fixedly connected to one of the lead screws is installed on the rear end face of the drying chamber.

[0008] As a preferred embodiment of the drying device for PET film production according to this utility model, temperature sensors and humidity sensors are all installed inside the preheating zone, drying zone and slow cooling zone.

[0009] As a preferred embodiment of the drying device for PET film production according to this utility model, three limiting rods are fixedly connected between the front and rear end faces inside the drying chamber, and three sliders located on the lower side are slidably connected to the three limiting rods respectively.

[0010] In a preferred embodiment of the drying device for PET film production according to this utility model, the middle part of the connecting pipe is a telescopic flexible hose.

[0011] As a preferred embodiment of the drying device for PET film production according to this utility model, a feed inlet is provided on the upper side of the left end face of the drying box, and a discharge outlet is provided on the lower side of the right end face of the drying box. Rectangular holes are provided through the outer walls of both partitions.

[0012] As a preferred embodiment of the drying device for PET film production according to this utility model, the outer wall of the drying chamber is equipped with a controller, and the servo motor, hot air blower, temperature sensor and humidity sensor are all electrically connected to the controller.

[0013] The beneficial effects of this utility model are:

[0014] 1. A multi-temperature zone segmented drying structure is adopted, which allows the film material to be dried through a preheating zone, a drying zone and a slow cooling zone, avoiding sudden heating and cooling caused by a single temperature zone and reducing defects such as bubbles and warping.

[0015] 2. The reciprocating motion uniform air supply mechanism ensures that hot air can be evenly applied to both the upper and lower sides of the film material, resulting in uniform heating and high drying efficiency. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is an overall structural diagram of a drying device for PET film production according to this utility model.

[0018] Figure 2 This is a front sectional view of a drying apparatus for PET film production according to this utility model.

[0019] Figure 3 This is a right sectional view of a drying apparatus for PET film production according to the present invention.

[0020] Figure 4 This is a structural diagram of the spiral-shaped air cavity of this utility model.

[0021] The markings in the diagram are: 1. Drying oven; 101. Preheating zone; 102. Drying zone; 103. Slow cooling zone; 2. Partition; 3. Film material; 4. Guide roller; 5. U-shaped air cavity; 6. Air hole; 7. Slider; 8. Lead screw; 9. Limiting rod; 10. Double groove synchronous pulley; 11. Single groove synchronous pulley; 12. Servo motor; 13. Hot air blower; 14. Connecting pipe; 15. Temperature sensor; 16. Humidity sensor. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-4A drying apparatus for PET film production includes a drying chamber 1. Two symmetrically distributed partitions 2 are fixedly connected inside the drying chamber 1, dividing it into a preheating zone 101, a drying zone 102, and a slow cooling zone 103 from top to bottom. Multiple guide rollers 4 are rotatably connected inside the drying chamber 1, and the film material 3 is arranged in an S-shape by the guide rollers 4. Drying mechanisms are provided inside the preheating zone 101, drying zone 102, and slow cooling zone 103. Each drying mechanism includes a rotary air chamber 5. Multiple evenly distributed air holes 6 are opened on the upper and lower end faces of the cavity 5. Slider 7 is fixedly connected to the upper and lower end faces of the shaped air cavity 5. Three lead screws 8 are rotatably connected between the front and rear end faces of the drying box 1. The three sliders 7 on the upper side are threadedly connected to the three lead screws 8 respectively. Three hot air blowers 13 are installed on the rear end face of the drying box 1. The air outlets of the three hot air blowers 13 are all connected to connecting pipes 14 extending into the interior of the drying box 1. The other end of the three connecting pipes 14 is connected to the three shaped air cavities 5 respectively.

[0024] In this embodiment: the film material 3 is dried through the preheating zone 101, the drying zone 102 and the slow cooling zone 103 to avoid sudden heating and cooling caused by a single temperature zone, and to reduce defects such as bubbles and warping. The hot air blower 13 is started and generates hot air, which is blown evenly on both sides of the film material 3 through multiple air holes 6. The servo motor 12 drives the lead screw 8 to rotate forward and backward. The lead screw 8 drives the loop air cavity 5 to move back and forth through the slider 7, so that the hot air is blown evenly on the film material 3 and the film material 3 is heated evenly.

[0025] As a technical optimization of this utility model, the front end of the middle lead screw 8 extends to the outside of the drying chamber 1 and is fixedly connected to a double-groove synchronous pulley 10. The front ends of the other two lead screws 8 also extend to the outside of the drying chamber 1 and are fixedly connected to single-groove synchronous pulleys 11. The double-groove synchronous pulley 10 and the two single-groove synchronous pulleys 11 are all connected by synchronous belt drive. A servo motor 12 with its output end fixedly connected to one of the lead screws 8 is installed on the rear end face of the drying chamber 1.

[0026] In this embodiment: the servo motor 12 is started, and the servo motor 12 drives one of the lead screws 8 to rotate in both directions. Then, through the double-groove synchronous pulley 10, the single-groove synchronous pulley 11 and the synchronous belt, the other two lead screws 8 are driven to rotate synchronously, which facilitates the synchronous back-and-forth movement of the three loop-shaped air chambers 5, so that the film material 3 is heated evenly.

[0027] As a technical optimization of this utility model, temperature sensor 15 and humidity sensor 16 are provided inside the preheating zone 101, drying zone 102 and slow cooling zone 103.

[0028] In this embodiment, the temperature sensor 15 and humidity sensor 16 facilitate real-time detection of the temperature and humidity in the preheating zone 101, drying zone 102 and slow cooling zone 103.

[0029] As a technical optimization of this utility model, three limiting rods 9 are fixedly connected between the front and rear end faces inside the drying oven 1, and three sliders 7 located on the lower side are slidably connected to the three limiting rods 9 respectively.

[0030] In this embodiment, the limiting rod 9 facilitates the limiting of the loop-shaped air cavity 5, making the back-and-forth movement of the loop-shaped air cavity 5 stable.

[0031] As a technical optimization of this utility model, the middle part of the connecting pipe 14 is a telescopic flexible hose.

[0032] In this embodiment: by setting the middle part of the connecting pipe 14 as a telescopic flexible hose, it is easy for the air outlet of the hot air blower 13 to maintain communication with the reciprocating air cavity 5.

[0033] As a technical optimization of this utility model, a feed inlet is provided on the upper side of the left end face of the drying oven 1, and a discharge outlet is provided on the lower side of the right end face of the drying oven 1. Rectangular holes are provided through the outer walls of the two partitions 2.

[0034] In this embodiment: a feed inlet is provided on the upper side of the left end face of the drying chamber 1, a discharge outlet is provided on the lower side of the right end face of the drying chamber 1, and rectangular holes are opened through the outer walls of both partitions 2 to facilitate the feeding and discharging of the film material 3.

[0035] As a technical optimization of this utility model, a controller is provided on the outer wall of the drying oven 1, and the servo motor 12, hot air blower 13, temperature sensor 15 and humidity sensor 16 are all electrically connected to the controller.

[0036] In this embodiment: the controller facilitates the normal operation of the servo motor 12 and the hot air blower 13. The temperature sensor 15 and the humidity sensor 16 monitor the temperature and humidity changes of the preheating zone 101, the drying zone 102 and the slow cooling zone 103 in real time and transmit the signals to the controller. The controller adjusts the power of the hot air blower 13 according to the temperature and humidity.

[0037] The working principle and usage process of this utility model are as follows: When in use, the servo motor 12 and the hot air blower 13 are started. The hot air blower 13 generates hot air and blows it evenly on both sides of the film material 3 through multiple air holes 6. The servo motor 12 drives one of the lead screws 8 to rotate forward and backward, and then drives the other two lead screws 8 to rotate synchronously through the double groove synchronous pulley 10, the single groove synchronous pulley 11 and the synchronous belt. The lead screws 8 drive the loop air cavity 5 to move back and forth through the slider 7, so that the hot air is evenly blown on the film material 3. The film material 3 is dried through the preheating zone 101, the drying zone 102 and the slow cooling zone 103 to avoid sudden heating and cooling caused by a single temperature zone and reduce defects such as bubbles and warping.

[0038] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A drying device for PET film production, comprising a drying box (1), characterized in that: The drying chamber (1) has two symmetrically distributed partitions (2) fixedly connected inside. The drying chamber (1) is divided into a preheating zone (101), a drying zone (102), and a slow cooling zone (103) from top to bottom by the two partitions (2). Multiple guide rollers (4) are rotatably connected inside the drying chamber (1). The film material (3) is arranged in an S-shape by the multiple guide rollers (4). The preheating zone (101), the drying zone (102), and the slow cooling zone (103) are all equipped with drying mechanisms. The drying mechanism includes a loop air cavity (5). The loop air cavity (5) has two upper and lower sections inside. Multiple evenly distributed air holes (6) are opened on the end face. Slider (7) is fixedly connected to the upper and lower end faces of the U-shaped air cavity (5). Three screw rods (8) are rotatably connected between the front and rear end faces inside the drying box (1). The three sliders (7) on the upper side are threadedly connected to the three screw rods (8). Three hot air blowers (13) are installed on the rear end face of the drying box (1). The air outlets of the three hot air blowers (13) are connected to connecting pipes (14) extending into the drying box (1). The other end of the three connecting pipes (14) is connected to the three U-shaped air cavities (5).

2. The drying device for PET film production according to claim 1, characterized in that: The front end of the middle lead screw (8) extends to the outside of the drying chamber (1) and is fixedly connected to a double-groove synchronous pulley (10). The front ends of the other two lead screws (8) also extend to the outside of the drying chamber (1) and are fixedly connected to single-groove synchronous pulleys (11). The double-groove synchronous pulley (10) and the two single-groove synchronous pulleys (11) are connected by synchronous belt drive. A servo motor (12) with its output end fixedly connected to one of the lead screws (8) is installed on the rear end face of the drying chamber (1).

3. The drying device for PET film production according to claim 2, characterized in that: Temperature sensors (15) and humidity sensors (16) are installed inside the preheating zone (101), drying zone (102) and slow cooling zone (103).

4. The drying device for PET film production according to claim 1, characterized in that: Three limiting rods (9) are fixedly connected between the front and rear end faces inside the drying oven (1), and three sliders (7) located on the lower side are slidably connected to the three limiting rods (9) respectively.

5. The drying device for PET film production according to claim 1, characterized in that: The middle part of the connecting pipe (14) is a telescopic flexible hose.

6. The drying device for PET film production according to claim 1, characterized in that: The drying chamber (1) has an inlet on the upper side of the left end face and an outlet on the lower side of the right end face. The outer walls of the two partitions (2) are provided with rectangular holes.

7. A drying apparatus for PET film production according to claim 3, characterized in that: The outer wall of the drying oven (1) is equipped with a controller, and the servo motor (12), hot air blower (13), temperature sensor (15) and humidity sensor (16) are all electrically connected to the controller.

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