Volatile matter removing device in polyester film manufacturing process

Abstract

A volatile matter removing device in the polyester film manufacturing process comprises a first flat nozzle cavity, a first exhaust pipe, a connecting rod, a movable transmission device, a first exhaust fan and a supporting frame, the first exhaust pipe is communicated with the first flat nozzle cavity, the top end of the first exhaust pipe penetrates through a long hole in a platform of the supporting frame and is connected with the first exhaust fan through a horizontal air collecting pipe, and the first flat nozzle cavity is communicated with the connecting rod. The movable transmission device comprises a movable lead screw, a sliding rod, a sliding rail, a sliding block and a motor, the sliding rod is fixed to the middle of the horizontal connecting rod and penetrates through a long hole to be in threaded connection with the movable lead screw, supporting seats are fixed to the two ends of the long hole, and bearings are arranged at the two ends of the movable lead screw and connected with bearing seats on the supporting seats. The motor is connected with one end of the movable lead screw, and a sliding block at the top of the connecting rod is connected with a sliding rail fixed to the lower surface of the supporting frame platform. The device disclosed by the utility model can be used for continuously extracting volatile matters near the lip, avoiding the problem of apparent defects caused by gathering and dropping of the volatile matters or adhesion of the volatile matters to the roller and stabilizing the product quality.

Description

Technical Field

[0001] The utility model relates to a volatile matter removal device, in particular to a volatile matter removal device in the process of manufacturing polyester films. Background Art

[0002] During the film manufacturing process, PET raw material reaches a temperature of 280°C-290°C after being melted, homogenized, and metered in an extruder. It then flows out through a lip and is pulled by casting rollers to form a thick sheet. As the high-temperature melt encounters the cool air and rollers, small polyester molecules precipitate from the melt and accumulate in the die area, gradually forming snowflake-like volatiles. If these volatiles are not removed over time, they may fall onto the casting sheet or adsorb onto the film when wind pressure or temperature fluctuates, forming white spots. After stretching, these spots can cause shallow white marks of varying width. Furthermore, these volatiles adhere strongly to the film, making them difficult to remove during subsequent processing, thus affecting the quality and usability of the film. Therefore, regular cleaning of the volatiles in the die area is necessary. Existing technologies often use dust removal and return air systems to extract these volatiles. However, these systems operate in a large space and are located far from the casting rollers, so volatiles can still accumulate in the die area, affecting product quality. Utility Model Content

[0003] In order to overcome the drawbacks of the prior art, the utility model provides a volatile matter removal device for the polyester film manufacturing process. Flat mouth structures are arranged on the front and rear sides of the lip, and the small molecule volatiles near the lip are extracted in time by using an exhaust fan, so as to prevent the small molecule volatiles from gathering and falling when cooled, thereby preventing the surface of the film and the roller from being contaminated.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A volatile matter removal device in a polyester film manufacturing process, the device includes a movable exhaust device, which is arranged in front of a lip, the movable exhaust device includes a first flat mouth cavity, a first exhaust pipe, a connecting rod, a movable transmission device, a first exhaust fan and a support frame, the cross-section of the first flat mouth cavity is set to be stepped and horizontally arranged, and the flat mouth at the bottom of the rectangular cavity faces the lip, a plurality of first exhaust pipes are provided, and the vertical intervals are uniformly spaced and connected to the top of the rectangular cavity of the first flat mouth cavity, the top ends of the first exhaust pipes pass through the long holes on the platform at the top of the support frame and are connected to the horizontal air collecting pipe, the horizontal air collecting pipe is connected to the air inlet of the first exhaust fan through a hose, the connecting rod is set to be "T" shaped and spaced apart The top of the connecting rod is provided with a sliding block, and the sliding block is fixed on the lower surface of the supporting plate, and the sliding block is connected to the sliding block by a screw thread.

[0006] The volatile matter removal device in the above-mentioned polyester film manufacturing process also includes a fixed exhaust device, which is arranged behind the lip and includes a second flat mouth cavity, a second exhaust pipe and a second exhaust fan. The structure of the second flat mouth cavity is the same as that of the first flat mouth cavity. It is arranged behind the lip, one end of the second exhaust pipe is connected to the second flat mouth cavity, and the other end is connected to the second exhaust fan. The second exhaust fan is fixed on the top platform of the support frame.

[0007] In the above-mentioned volatile matter removal device in the polyester film manufacturing process, the second flat mouth cavity is fixed on the lower platform of the support frame.

[0008] In the volatile matter removal device in the polyester film manufacturing process, the first exhaust duct and the second exhaust duct are both configured as a heating and insulation sleeve structure, including an inner stainless steel tube, a polyurethane insulation layer and an outer protective layer.

[0009] In the above-mentioned volatile matter removal device in the polyester film manufacturing process, the first flat mouth cavity can be moved to 10-20 cm in front of the lip; the second flat mouth cavity is fixed 10-15 cm behind the lip.

[0010] In the above-mentioned volatile matter removal device in the polyester film manufacturing process, the flat mouth opening height of the first flat mouth cavity and the second flat mouth cavity is 5-20 mm, and the opening width is 1.8-2.2 m.

[0011] The volatile matter removal device in the above-mentioned polyester film manufacturing process is also provided with an activated carbon adsorption tank, which is fixed on the top platform of the support frame. The air outlet of the first exhaust fan is connected to the activated carbon adsorption tank through a hose, and the air outlet of the second exhaust fan is connected to the activated carbon adsorption tank through an insulation pipe.

[0012] The beneficial effects of the present invention are as follows: the device of the present invention is installed on the front and rear sides of the lip, the movable flat mouth cavity is moved to 10-20 cm in front of the lip, and the fixed flat mouth cavity is installed 10-15 cm behind the lip, which can timely, continuously and effectively extract volatiles near the lip during the film manufacturing process, effectively reduce the accumulation of volatiles in the die head area, avoid the apparent defects caused by volatiles falling or adhering to the roller, stabilize product quality, extend continuous production time, and improve film production stability; the exhaust duct adopts a heating and insulation structure to avoid volatiles pre-cooling and accumulation on the pipe wall, blocking the exhaust duct; the first flat mouth cavity adjusts its position in real time through a mobile transmission device according to production needs, has higher adaptability, and is convenient for cleaning the flat mouth cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the volatile matter removal device;

[0016] Figure 3 Schematic diagram of the cross-section structure of the first exhaust duct.

[0017] In the figure: 1. First flat mouth cavity; 2. Second exhaust duct; 3. Connecting rod; 4. Moving transmission device; 4-1. Moving screw; 4-2. Sliding rod; 4-3. Slide rail; 4-4. Slider; 4-5. Motor; 5. First exhaust fan; 6. Support frame; 7. Lip; 8. Horizontal air collecting duct; 9. Horizontal connecting rod; 10. Second flat mouth cavity; 11. Second exhaust duct; 12. Second exhaust fan; 13. Activated carbon adsorption tank. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] See Figure 1 and Figure 2The utility model discloses a volatile removal device in the polyester film manufacturing process, including movable exhaust device and fixed exhaust device, both are arranged respectively in the front and rear of lip 7, the movable exhaust device includes first flat mouth cavity 1, first exhaust pipe 2, connecting rod 3, mobile transmission device 4, first exhaust fan 5 and support frame 6, the cross section of first flat mouth cavity 1 is arranged as ladder shape, horizontally arranged, and the flat mouth of the cuboid cavity bottom convex is towards the direction of lip 7, first exhaust pipe 2 is provided with several (such as the interval is provided with three in the drawing), and it is communicated with the cuboid cavity top of first flat mouth cavity 1 vertically and evenly, the top of first exhaust pipe 2 respectively passes through the long hole on the top platform of support frame 6 and is communicated with horizontal wind collecting pipe 8, horizontal wind collecting pipe 8 is connected with the air inlet of first exhaust fan 5 through the hose, connecting rod 3 is arranged as the shape of " T " (arranged as two), and it is arranged in the interval between first exhaust pipe, and the bottom is fixed in the cuboid cavity top of first flat mouth cavity 1, and the top horizontal section one end is connected with horizontal connecting rod 9, mobile transmission device 4 includes mobile lead screw 4-1, sliding rod 4-2, slide rail 4-3, sliding block 4-4 and motor 4-5, sliding rod 4-2 is fixed vertically in the middle part of horizontal connecting rod 9, passes through the long hole on the top platform of support frame 6 and is screwed with mobile lead screw 4-1, the platform on both ends of long hole is fixed with support seat, bearing seat is arranged on both support seats, motor 4-5 is fixed on the support seat of one end, mobile lead screw 4-1 is horizontally arranged, and both ends are provided with bearing, and bearing is used in cooperation with bearing seat, one end of mobile lead screw is connected with motor 4-5 by passing through bearing seat, and the other end is connected by passing through bearing and bearing seat, the sliding block 4-4 is arranged on the top horizontal section of connecting rod 3, the slide rail 4-3 is fixed on the lower surface of the top platform of support frame 6, the sliding block 4-4 is slidably connected with the slide rail 4-3, the motor is started, drives mobile lead screw to rotate, sliding rod moves back and forth along mobile lead screw, to realize the displacement of first flat mouth cavity.

[0020] The fixed exhaust device includes second flat mouth cavity 10, second exhaust pipe 11 and second exhaust fan 12, the structure of second flat mouth cavity 10 is same with first flat mouth cavity 1, and it is arranged in the rear of lip 7, one end of second exhaust pipe 11 is communicated with second flat mouth cavity 10, and the other end is connected with second exhaust fan 12, and second exhaust fan 12 is fixed on the top platform of support frame 6. The air outlet of first exhaust fan 5 is connected with activated carbon adsorption tank 13 through the hose, and the air outlet of second exhaust fan 12 is connected with activated carbon adsorption tank 13 through the heat preservation pipe. The gas treated by activated carbon adsorption tank 13 is discharged.

[0021] Reference Figure 3The first exhaust pipe 2 and the second exhaust pipe 11 are both configured as a heating and insulation sleeve structure, including an inner stainless steel pipe, a polyurethane insulation layer and an outer protective layer to prevent volatiles from accumulating in the exhaust pipe and blocking the exhaust pipe. The hose is a Teflon tube.

[0022] When in use, the first flat mouth cavity 2 can be moved to 10-20 cm in front of the lip; the second flat mouth cavity 10 is fixed 10-15 cm behind the lip.

[0023] The flat mouth opening height of the first flat mouth cavity 2 and the second flat mouth cavity 10 is 5-20 mm, and the opening width is 1.8-2.2 m.

[0024] Working process: During production, start the motor, move the screw to rotate, drive the sliding rod to move back and forth in the long hole, the sliding rod drives the connecting rod to move left and right, and the slider on the top of the connecting rod slides along the slide rail, thereby driving the first exhaust duct to move to 10-20cm in front of the lip. Turn on the first exhaust fan and the second exhaust fan to continuously work and remove volatiles at the lip; when production is interrupted, clean the first flat mouth cavity by moving the screw away from the lip, and move the casting roller to clean the second flat mouth cavity.

Claims

1. A device for removing volatiles in a polyester film manufacturing process, characterized in that: The device includes a movable exhaust device, which is arranged in front of the lip (7). The movable exhaust device includes a first flat mouth cavity (1), a first exhaust pipe (2), a connecting rod (3), a movable transmission device (4), a first exhaust fan (5) and a support frame (6). The cross section of the first flat mouth cavity (1) is set to be stepped and horizontally arranged. The flat mouth at the bottom of its rectangular cavity faces the lip (7). A plurality of first exhaust pipes (2) are provided, which are evenly spaced vertically and connected to the top of the rectangular cavity of the first flat mouth cavity (1). The top ends of the first exhaust pipes (2) pass through the long holes on the top platform of the support frame (6) and are connected to the horizontal air collecting pipe (8). The horizontal air collecting pipe (8) is connected to the air inlet of the first exhaust fan (5) through a hose. The connecting rod (3) is set to be "T" shaped and is spaced between the first exhaust pipes. The bottom end is fixed to the first flat mouth cavity (1). The top of the rectangular cavity, the top horizontal section is connected to the horizontal connecting rod (9), the mobile transmission device (4) includes a moving screw (4-1), a sliding rod (4-2), a slide rail (4-3), a slider (4-4) and a motor (4-5), the sliding rod (4-2) is vertically fixed to the middle of the horizontal connecting rod (9), passes through the long hole on the top platform of the support frame (6) and is threadedly connected to the moving screw (4-1), support seats are fixed at both ends of the long hole, and bearing seats are provided on both support seats. The moving screw (4-1) is horizontally arranged, and bearings are provided at both ends. The bearings are connected to the bearing seats. The motor (4-5) is fixed on the support seat at one end and is connected to one end of the moving screw. A slider (4-4) is provided on the top horizontal section of the connecting rod (3), the slide rail (4-3) is fixed on the lower surface of the top platform of the support frame (6), and the slider (4-4) is slidably connected to the slide rail (4-3).

2. The volatile matter removal device in the polyester film manufacturing process according to claim 1, characterized in that: The device also includes a fixed exhaust device, which is arranged behind the lip (7) and includes a second flat mouth cavity (10), a second exhaust pipe (11) and a second exhaust fan (12). The second flat mouth cavity (10) has the same structure as the first flat mouth cavity (1) and is arranged behind the lip (7). One end of the second exhaust pipe (11) is connected to the second flat mouth cavity (10) and the other end is connected to the second exhaust fan (12). The second exhaust fan (12) is fixed on the top platform of the support frame (6).

3. The volatile matter removal device for polyester film manufacturing according to claim 2, characterized in that: The second flat mouth cavity (10) is fixed on the lower platform of the support frame (6).

4. The volatile matter removal device for polyester film manufacturing according to claim 2, characterized in that: The first exhaust duct (2) and the second exhaust duct (11) are both configured as a heating and heat-insulating sleeve structure, comprising an inner stainless steel tube, a polyurethane heat-insulating layer, and an outer protective layer.

5. The volatile matter removal device in the polyester film manufacturing process according to claim 2, characterized in that: The first flat mouth cavity (1) can be moved to 10-20 cm in front of the lip; the second flat mouth cavity (10) is fixed 10-15 cm behind the lip.

6. The volatile matter removal device for polyester film manufacturing according to claim 2, characterized in that: The flat mouth opening height of the first flat mouth cavity (1) and the second flat mouth cavity (10) is 5-20 mm, and the opening width is 1.8-2.2 m.

7. The volatile matter removal device for polyester film manufacturing according to claim 2, characterized in that: The device is further provided with an activated carbon adsorption tank (13), which is fixed on the top platform of the support frame (6); the air outlet of the first exhaust fan (5) is connected to the activated carbon adsorption tank (13) through a hose; and the air outlet of the second exhaust fan (12) is connected to the activated carbon adsorption tank (13) through an insulation pipe.

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