Film blowing machine for biodegradable plastic production

Abstract

The utility model relates to the field of film processing, discloses a film blowing machine for biodegradable plastic production, and aims to solve the problems that in the working process of the film blowing machine, air used for film blowing contains fine dust, the film blowing quality can be influenced if the air is not treated, VOC (volatile organic compound) waste gas can be generated in production, and the human health can be influenced after the VOC waste gas is directly discharged. The air blower is communicated with the filter chamber, the HEPA efficient filter screen is arranged in the filter chamber, the filter chamber is communicated with the die head through the first air conveying pipe, the spherical filter pipe is communicated with the air extracting pump, the activated carbon adsorbent is arranged in the spherical filter pipe, and the air extracting pump is communicated with the absorbing chamber through the second air conveying pipe, so that fine dust in air is filtered, and the air purifying effect is achieved. The problem that fine dust adheres to the thin film is solved, the quality of the thin film is improved, and the exhausted VOC waste gas can be captured and adsorbed, so that the VOC waste gas is purified, and the body health of workers is protected.

Description

Technical Field

[0001] The utility model relates to the field of film processing, in particular to a film blowing machine for producing biodegradable plastics. Background Art

[0002] Biodegradable plastic film is a common plastic product. It can be produced by calendering, extrusion, blow molding and other process methods. Blown film is to add biodegradable plastic particles into a hopper, and use the rotating beveled edge of the auger to generate a thrust perpendicular to the beveled edge on the biodegradable plastic particles to push the biodegradable plastic particles forward. During the pushing process, the biodegradable plastic particles gradually melt due to friction, collision and external heating of the barrel. After the molten biodegradable plastic particles come out of the die, they are rolled up by a cooling air ring, a herringbone plate, and a traction roller to become a finished film.

[0003] The patent application number is CN201921991384.2, a film blowing machine for film processing. By setting a filter box and a HEPA high-efficiency filter, the air drawn from the outside is processed during the blower film blowing operation, and the fine dust in the air is filtered out, solving the problem of fine dust adhering to the film and improving the quality of the film. However, in this process, the heating and melting of biodegradable plastic particles will produce VOC waste gas, which will have a huge impact on human health after direct emission. For the health of the staff, the generated VOC waste gas needs to be processed. Utility Model Content

[0004] The utility model aims to solve the technical problem that the film blowing machine emits VOC waste gas that harms human health during operation, and provides a film blowing machine for biodegradable plastic production, which uses activated carbon adsorbent to capture and adsorb VOC waste gas, thereby purifying the VOC waste gas.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A film blowing machine for producing biodegradable plastics, comprising a base, a die head, a die mouth, a barrel, a hopper, a first motor, a horizontal auger, a second motor, a vertical auger, four electric heating plates, a filter chamber, a HEPA high-efficiency filter, a blower, a first air duct, an absorption chamber, an air pump, a second air duct, a spherical filter tube, an activated carbon adsorbent, and a controller. The base is a rectangular box-shaped structure made of metal, and the interior is a cavity. The die head is arranged above the base, and the bottom of the die head is fixedly connected to the top of the base. The die mouth is arranged above the die head, and the bottom of the die mouth is connected to the top of the die head. The barrel is arranged on the side of the die head and above the base, the side end of the barrel is connected to the side of the die head, and the bottom of the barrel is fixedly connected to the top of the base. The hopper is arranged above the barrel away from the die head, and the bottom of the hopper is connected to the top of the barrel. The first motor is arranged on the side of the barrel away from the die head, the first motor shaft horizontally penetrates the side end of the barrel away from the die head, the axis of the first motor shaft coincides with the axis of the barrel, and the side of the first motor is fixedly connected to the side end of the barrel. The horizontal auger is arranged horizontally inside the barrel, the axis of the horizontal auger coincides with the axis of the first motor shaft, and the side end of the horizontal auger close to the first motor is fixedly connected to the first motor shaft. The second motor is arranged inside the base and below the die head, the second motor shaft vertically penetrates the bottom of the die head, the axis of the second motor shaft coincides with the axis of the bottom of the die head, and the top of the second motor is fixedly connected to the bottom of the die head. The vertical auger is vertically arranged inside the die head, the axis of the vertical auger coincides with the axis of the second motor shaft, and the lower end of the vertical auger close to the second motor is fixedly connected to the second motor shaft. The four electric heating plates are long thin plates, which are respectively inlaid on the upper surface of the barrel, the lower surface of the barrel, the inner surface of the die head, and close to the inner surface of the die head. The filter chamber is arranged inside the base near the die head, and the bottom of the filter chamber is fixedly connected to the lower surface of the base. The HEPA high-efficiency filter is arranged inside the filter chamber and is parallel to the top surface of the filter chamber, and the side of the HEPA high-efficiency filter is fixedly connected to the inner surface of the filter chamber. The blower is arranged inside the base and on the side of the filter chamber, the bottom of the blower is fixedly connected to the lower surface of the base, the air inlet of the blower penetrates the upper surface of the base and communicates with the outside, and the air outlet is connected to the side of the filter chamber. The first air supply pipe is arranged above the filter chamber and on the side of the die head, the lower end of the first air supply pipe penetrates the upper surface of the base downward and communicates with the filter chamber, and the upper end is connected to the side of the die head. The absorption chamber is arranged above the die mouth, and the bottom of the absorption chamber is connected to the top of the die mouth. The vacuum pump is arranged above the barrel near the die head, and the bottom of the vacuum pump is fixedly connected to the top of the barrel. The second air supply pipe is arranged on the side of the absorption chamber near the vacuum pump, the upper end of the second air supply pipe is connected to the side of the absorption chamber, and the lower end is connected to the vacuum pump nozzle. The spherical filter tube is arranged above the barrel and on the side of the vacuum pump. The air inlet of the spherical filter tube is connected to the exhaust nozzle of the vacuum pump, and the air outlet is connected to the outside. The activated carbon adsorbent is arranged inside the spherical filter tube. The controller penetrates the side of the base and is arranged inside the base. The bottom of the controller is fixedly connected to the bottom of the base. The controller is electrically connected to the first motor, the second motor, the electric heating plate, the blower, and the vacuum pump respectively.

[0007] When using the film blowing machine for production, the staff turns on the first motor, the second motor, the electric heating plate, the blower, and the vacuum pump through the controller. The first motor shaft rotates and drives the horizontal auger to rotate along the axis direction of the first motor shaft. The second motor shaft rotates and drives the vertical auger to rotate along the axis direction of the second motor shaft. The electric heating plate starts to heat, the blower and the vacuum pump start to operate, and the outside air enters the blower through the blower air inlet, and then reaches the inside of the filter chamber through the blower outlet. The fine dust in the air is filtered when passing through the HEPA high-efficiency filter. The filtered air passes through the first air duct, die head, die mouth, second air duct, vacuum pump, spherical filter tube in turn and then returns to the outside.

[0008] When the film blowing machine is running, the staff pours the biodegradable plastic particles into the hopper. The biodegradable plastic particles pass through the hopper into the barrel. The horizontal auger pushes the biodegradable plastic particles to the bottom of the die. The biodegradable plastic particles collide with each other and melt due to the friction of the horizontal auger and the heating of the electric heating plate. The vertical auger pushes the molten biodegradable plastic particles to the top of the die. The molten biodegradable plastic particles expand after being heated by the electric heating plate and are blown out of the die mouth by the filtered air.

[0009] VOC waste gas will be generated during the heating, melting and expansion of biodegradable plastic particles. After passing through the die, the VOC waste gas passes through the absorption chamber and the second air duct in turn under the action of the vacuum pump and enters the interior of the vacuum pump. After being discharged into the spherical filter tube through the vacuum pump, it is captured and adsorbed by the activated carbon adsorbent.

[0010] Furthermore, a number of base support blocks are fixedly connected to the lower surface of the base.

[0011] The base support block can improve the stability of the overall structure and also facilitate the movement of the film blowing machine.

[0012] Furthermore, a safety door is installed on the side of the base, and a sealing door is installed on the side of the filter chamber.

[0013] The installation of a sealed door can not only improve the sealing of the filter chamber to prevent contamination by unfiltered air, but also allow the HEPA high-efficiency filter to be replaced in time when the purification effect is not ideal.

[0014] Furthermore, one end of the barrel away from the die head is fixed to the top of the base by welding, and a space is left between the barrel and the base.

[0015] Make sure there is sufficient air entering the air inlet when the blower is operating.

[0016] Furthermore, an inclined surface is formed above the side surface where the die head is connected to the first air duct.

[0017] The filtered air flows through the first air delivery pipe and changes its flow direction through the inclined surface, which can greatly improve the film blowing efficiency and quality.

[0018] Furthermore, filter screens are installed at both ends of the spherical filter tube close to the activated carbon adsorbent.

[0019] The VOC exhaust gas is pre-treated by the filter to remove particulate matter. At the same time, the filters at both ends can prevent the activated carbon adsorbent from moving to the air inlet and outlet.

[0020] Beneficial effects of the utility model:

[0021] 1. The utility model is provided with a blower, a filter box, a HEPA high-efficiency filter, an air pump, an absorption box, a spherical filter tube, an activated carbon adsorbent and other structures, which not only filters the fine dust in the air, solves the problem of fine dust adhering to the film, improves the quality of the film, but also can capture and adsorb the discharged VOC waste gas, thereby purifying the VOC waste gas and protecting the health of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a front view cross-sectional structural schematic diagram of a film blowing machine for producing biodegradable plastics.

[0023] Figure 2 The utility model is a front view structural schematic diagram of a film blowing machine for producing biodegradable plastics.

[0024] Explanation of the reference numerals: 1. base; 2. die head; 3. die mouth; 4. barrel; 5. hopper; 6. first motor; 7. horizontal auger; 8. second motor; 9. vertical auger; 10. electric heating plate; 11. filter chamber; 12. HEPA high-efficiency filter; 13. blower; 14. first air duct; 15. absorption chamber; 16. vacuum pump; 17. second air duct; 18. spherical filter tube; 19. activated carbon adsorbent; 20. controller. DETAILED DESCRIPTION

[0025] The concept of the present invention and the technical effects produced will be clearly and completely described below in conjunction with the embodiments so as to fully understand the purpose, features and effects of the present invention.

[0026] like Figure 1A film blowing machine for producing biodegradable plastics, comprising a base 1, a die head 2, a die mouth 3, a barrel 4, a hopper 5, a first motor 6, a horizontal auger 7, a second motor 8, a vertical auger 9, four electric heating plates 10, a filter chamber 11, a HEPA high-efficiency filter 12, a blower 13, a first air duct 14, an absorption chamber 15, an air pump 16, a second air duct 17, a spherical filter tube 18, an activated carbon adsorbent 19, and a controller 20. The base 1 is a rectangular box-shaped structure made of metal material, and the interior is a cavity. The die head 2 is arranged above the base 1, and the bottom of the die head 2 is fixedly connected to the top of the base 1. The die mouth 3 is arranged above the die head 2, and the bottom of the die mouth 3 is connected to the top of the die head 2. The barrel 4 is arranged on the side of the die head 2 and arranged above the base 1, the side end of the barrel 4 is connected to the side of the die head 2, and the bottom of the barrel 4 is fixedly connected to the top of the base 1. The hopper 5 is arranged above the barrel 4 away from the die head 2, and the bottom of the hopper 5 is connected to the top of the barrel 4. The first motor 6 is arranged on the side of the barrel 4 away from the die head 2, the first motor 6 shaft horizontally penetrates the side end of the barrel 4 away from the die head 2, the axis of the first motor 6 shaft coincides with the axis of the barrel 4, and the side of the first motor 6 is fixedly connected to the side end of the barrel 4. The horizontal auger 7 is arranged horizontally inside the barrel 4, the axis of the horizontal auger 7 coincides with the axis of the first motor 6 shaft, and the side end of the horizontal auger 7 close to the first motor 6 is fixedly connected to the shaft of the first motor 6. The second motor 8 is arranged inside the base 1 and below the die head 2, the shaft of the second motor 8 vertically penetrates the bottom of the die head 2, the axis of the second motor 8 shaft coincides with the axis of the bottom of the die head 2, and the top of the second motor 8 is fixedly connected to the bottom of the die head 2. The vertical auger 9 is arranged vertically inside the die head 2, the axis of the vertical auger 9 coincides with the axis of the second motor 8 shaft, and the lower end of the vertical auger 9 close to the second motor 8 is fixedly connected to the shaft of the second motor 8. The four electric heating plates 10 are long thin plates, which are respectively embedded in the upper surface of the barrel 4, the lower surface of the barrel 4, the inner surface of the die head 2 and close to the inner surface of the die head 2. The filter chamber 11 is arranged inside the base 1 near the die head 2, and the bottom of the filter chamber 11 is fixedly connected to the lower surface of the base 1. The HEPA high-efficiency filter 12 is arranged inside the filter chamber 11 and is parallel to the top surface of the filter chamber 11. The side of the HEPA high-efficiency filter 12 is fixedly connected to the inner surface of the filter chamber 11. The blower 13 is arranged inside the base 1 and arranged on the side of the filter chamber 11. The bottom of the blower 13 is fixedly connected to the lower surface of the base 1. The air inlet of the blower 13 passes through the upper surface of the base 1 and is connected to the outside world, and the air outlet is connected to the side of the filter chamber 11. The first air duct 14 is arranged above the filter chamber 11 and is arranged on the side of the die head 2. The lower end of the first air duct 14 passes through the upper surface of the base 1 downward to communicate with the filter chamber 11, and the upper end is connected to the side of the die head 2. The absorption chamber 15 is arranged above the die opening 3, and the bottom of the absorption chamber 15 is connected with the top of the die opening 3. The suction pump 16 is arranged above the barrel 4 near the die head 2, and the bottom of the suction pump 16 is fixedly connected with the top of the barrel 4.The second air duct 17 is arranged on the side of the absorption chamber 15 near the vacuum pump 16. The upper end of the second air duct 17 is connected to the side of the absorption chamber 15, and the lower end is connected to the suction nozzle of the vacuum pump 16. The spherical filter tube 18 is arranged above the barrel 4 and on the side of the vacuum pump 16. The air inlet of the spherical filter tube 18 is connected to the exhaust nozzle of the vacuum pump 16, and the air outlet is connected to the outside. The activated carbon adsorbent 19 is arranged inside the spherical filter tube 18. The controller 20 passes through the side of the base 1 and is arranged inside the base 1. The bottom of the controller 20 is fixedly connected to the bottom of the base 1. The controller 20 is electrically connected to the first motor 6, the second motor 8, the electric heating plate 10, the blower 13, and the vacuum pump 16 respectively.

[0027] When the film blowing machine is used for production, the staff turns on the first motor 6, the second motor 8, the electric heating plate 10, the blower 13, and the vacuum pump 16 through the controller 20. The shaft of the first motor 6 rotates and drives the horizontal auger 7 to rotate along the axis direction of the shaft of the first motor 6. The shaft of the second motor 8 rotates and drives the vertical auger 9 to rotate along the axis direction of the shaft of the second motor 8. The electric heating plate 10 starts to heat, and the blower 13 and the vacuum pump 16 start to operate. The outside air enters the inside of the blower 13 through the air inlet of the blower 13, and then reaches the inside of the filter chamber 11 through the air outlet of the blower 13. The fine dust in the air is filtered when passing through the HEPA high-efficiency filter 12. The filtered air passes through the first air duct 14, the die head 2, the die mouth 3, the second air duct 17, the vacuum pump 16, and the spherical filter tube 18 in turn and then returns to the outside.

[0028] When the film blowing machine is running, the staff pours the biodegradable plastic particles into the hopper 5, the biodegradable plastic particles pass through the hopper 5 into the barrel 4, the transverse auger 7 pushes the biodegradable plastic particles to the bottom of the die 2, the biodegradable plastic particles collide with each other and melt after being rubbed by the transverse auger 7 and heated by the electric heating plate 10, the vertical auger 9 pushes the molten biodegradable plastic particles to the top of the die 2, the molten biodegradable plastic particles expand after being heated by the electric heating plate 10, and are blown out of the die 3 by the filtered air.

[0029] VOC waste gas is generated during the heating, melting and expansion of the biodegradable plastic particles. After passing through the die 3, the VOC waste gas passes through the absorption chamber 15 and the second air duct 17 in turn under the action of the vacuum pump 16 and enters the interior of the vacuum pump 16. After being discharged into the spherical filter tube 18 through the vacuum pump 16, it is captured and adsorbed by the activated carbon adsorbent 19.

[0030] A number of base 1 support blocks are fixedly connected to the lower surface of the base 1 .

[0031] The support block of the base 1 can improve the stability of the overall structure and facilitate the movement of the film blowing machine.

[0032] A safety door is installed on the side of the base 1, and a sealing door is installed on the side of the filter chamber 11.

[0033] The installation of the sealing door can not only improve the sealing performance of the filter chamber 11 to prevent pollution by unfiltered air, but also can replace the HEPA high-efficiency filter 12 in time when the purification effect is not ideal.

[0034] One end of the barrel 4 away from the die head 2 is fixed to the top of the base 1 by welding, and a space is left between the barrel 4 and the base 1 .

[0035] The blower 13 ensures that sufficient air enters the air inlet when it is working.

[0036] The upper side of the side where the die head 2 is connected to the first air supply pipe 14 is an inclined surface.

[0037] The filtered air flows through the first air delivery pipe 14 and changes its flow direction through the inclined surface, which can improve the film blowing efficiency and quality to a greater extent.

[0038] Filter screens are installed at both ends of the spherical filter tube 18 close to the activated carbon adsorbent 19.

[0039] The VOC exhaust gas is pre-treated by the filter to remove particulate matter. At the same time, the filter at both ends can prevent the activated carbon adsorbent 19 from moving to the air inlet and the air outlet.

[0040] Working principle: When using the film blowing machine for production, the staff turns on the first motor, the second motor, the electric heating plate, the blower, and the vacuum pump through the controller. The first motor shaft rotates and drives the horizontal auger to rotate along the axis direction of the first motor shaft. The second motor shaft rotates and drives the vertical auger to rotate along the axis direction of the second motor shaft. The electric heating plate starts to heat, and the blower and the vacuum pump start to run. The outside air enters the blower through the blower air inlet, and then reaches the inside of the filter chamber through the blower outlet. The fine dust in the air is filtered when passing through the HEPA high-efficiency filter. The filtered air passes through the first air duct, die head, die mouth, second air duct, vacuum pump, spherical filter tube in turn and returns to the outside. When the film blowing machine is running, the staff pours the biodegradable plastic particles into the hopper, and the biodegradable plastic particles pass through the hopper into the barrel. The horizontal auger pushes the biodegradable plastic particles to the bottom of the die head. The biodegradable plastic particles collide with each other and melt after being rubbed by the horizontal auger and heated by the electric heating plate. The vertical auger pushes the molten biodegradable plastic particles to the top of the die head. The molten biodegradable plastic particles expand after being heated by the electric heating plate and blown out of the die mouth by the filtered air. VOC waste gas will be generated during the heating, melting and expansion of biodegradable plastic particles. After passing through the die mouth, the VOC waste gas passes through the absorption chamber and the second air duct in turn under the action of the vacuum pump and enters the vacuum pump. After being discharged into the spherical filter tube by the vacuum pump, it is captured and adsorbed by the activated carbon adsorbent.

[0041] The above embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work all fall within the scope of protection of the utility model.

Claims

1. A film blowing machine for producing biodegradable plastics, characterized in that: The invention comprises a base (1), a die head (2), a die mouth (3), a barrel (4), a hopper (5), a first motor (6), a horizontal auger (7), a second motor (8), a vertical auger (9), four electric heating plates (10), a filter chamber (11), a HEPA high-efficiency filter (12), a blower (13), a first air duct (14), an absorption chamber (15), an air pump (16), a second air duct (17), a spherical filter tube (18), an activated carbon adsorbent (19), and a controller (20). The base (1) is a rectangular box-shaped structure made of metal, and the interior is a cavity; the die head (2) is arranged above the base (1), and the bottom of the die head (2) is fixedly connected to the top of the base (1); The die opening (3) is arranged above the die head (2), and the bottom of the die opening (3) is connected to the top of the die head (2); the barrel (4) is arranged on the side of the die head (2) and on the top of the base (1), the side end of the barrel (4) is connected to the side of the die head (2), and the bottom of the barrel (4) is fixedly connected to the top of the base (1); the hopper (5) is arranged above the barrel (4) away from the die head (2), and the bottom of the hopper (5) is connected to the top of the barrel (4); the first motor (6) is arranged on the side of the barrel (4) away from the die head (2), and the rotating shaft of the first motor (6) transversely passes through the side end of the barrel (4) away from the die head (2), and the first motor (6) is arranged on the side of the barrel (4) away from the die head (2). The axis of the rotating shaft of a motor (6) coincides with the axis of the barrel (4), and the side of the first motor (6) is fixedly connected to the side end of the barrel (4); the transverse auger (7) is transversely arranged inside the barrel (4), the axis of the transverse auger (7) coincides with the axis of the rotating shaft of the first motor (6), and the side end of the transverse auger (7) close to the first motor (6) is fixedly connected to the rotating shaft of the first motor (6); the second motor (8) is arranged inside the base (1) and below the die head (2), the rotating shaft of the second motor (8) vertically passes through the bottom of the die head (2), the axis of the rotating shaft of the second motor (8) coincides with the axis of the bottom of the die head (2), and the top of the second motor (8) The vertical auger (9) is vertically arranged inside the die head (2), the axis of the vertical auger (9) coincides with the axis of the rotating shaft of the second motor (8), and the lower end of the vertical auger (9) close to the second motor (8) is fixedly connected to the rotating shaft of the second motor (8); the four electric heating plates (10) are long thin plates, which are respectively embedded in the upper surface of the inner part of the barrel (4), the lower surface of the inner part of the barrel (4), the inner surface of the die head (2) and closely attached to the inner surface of the die head (2); the filter chamber (11) is arranged inside the base (1) close to the die head (2), and the bottom of the filter chamber (11) is fixedly connected to the lower surface of the inner part of the base (1);The HEPA high-efficiency filter (12) is arranged inside the filter chamber (11) and is parallel to the top surface of the filter chamber (11), and the side surface of the HEPA high-efficiency filter (12) is fixedly connected to the inner surface of the filter chamber (11); the blower (13) is arranged inside the base (1) and is arranged on the side of the filter chamber (11), the bottom of the blower (13) is fixedly connected to the lower surface of the base (1), and the air inlet of the blower (13) passes through the upper surface of the base (1) and is connected to the outside. The air outlet is connected to the side of the filter chamber (11); the first air supply pipe (14) is arranged above the filter chamber (11) and on the side of the die head (2); the lower end of the first air supply pipe (14) passes through the upper surface of the base (1) downward and is connected to the filter chamber (11), and the upper end is connected to the side of the die head (2); the absorption chamber (15) is arranged above the die opening (3), and the bottom of the absorption chamber (15) is connected to the top of the die opening (3); the vacuum pump (16) is arranged on the barrel (4) The bottom of the vacuum pump (16) is fixedly connected to the top of the barrel (4) near the die head (2); the second air supply pipe (17) is arranged on the side of the absorption chamber (15) near the vacuum pump (16); the upper end of the second air supply pipe (17) is connected to the side of the absorption chamber (15), and the lower end is connected to the suction nozzle of the vacuum pump (16); the spherical filter tube (18) is arranged above the barrel (4) and on the side of the vacuum pump (16); the air inlet of the spherical filter tube (18) The air outlet is connected to the exhaust nozzle of the vacuum pump (16), and the air outlet is connected to the outside; the activated carbon adsorbent (19) is arranged inside the spherical filter tube (18); the controller (20) passes through the side of the base (1) and is arranged inside the base (1); the bottom of the controller (20) is fixedly connected to the bottom of the base (1); the controller (20) is electrically connected to the first motor (6), the second motor (8), the electric heating plate (10), the blower (13), and the vacuum pump (16) respectively.

2. A film blowing machine for producing biodegradable plastics according to claim 1, characterized in that A number of base (1) support blocks are fixedly connected to the lower surface of the base (1).

3. A film blowing machine for producing biodegradable plastics according to claim 1, characterized in that A safety door is installed on the side of the base (1), and a sealing door is installed on the side of the filter chamber (11).

4. A film blowing machine for producing biodegradable plastics according to claim 1, characterized in that The upper side of the side where the die head (2) is connected to the first air duct (14) is an inclined surface.

5. The film blowing machine for producing biodegradable plastics according to claim 1, characterized in that The suction nozzle of the suction pump (16) is connected to the lower end of the second air supply pipe (17), and the exhaust nozzle is connected to the air inlet of the spherical filter tube (18).

6. A film blowing machine for producing biodegradable plastics according to claim 1, characterized in that : Filter screens are respectively installed at both ends of the spherical filter tube (18) close to the activated carbon adsorbent (19).

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