A flat film extrusion film forming hot air composite geomembrane production device and process

Abstract

The present application discloses a flat film extrusion film-forming hot air composite geomembrane production device and process, belonging to the field of geomembrane production technology. The production device includes a frame, a geotextile unwinding device, a film extrusion device, a temperature-controlled multi-roll calender, an industrial hot air blower, a cold-pressed composite roller assembly and a winding device; the film extrusion device is arranged on the frame, and the industrial hot air blower heats the two surfaces of the geomembrane on the second roller and the third roller. The film extrusion device is arranged to cooperate with the temperature-controlled multi-roll calender to obtain a flat film extruded geomembrane with a smooth and uniform thickness; the surface of the geomembrane after film formation is heated by hot air from the industrial hot air blower, and is bonded with the geotextile and composited by the temperature-controlled multi-roll calender, so that the base film will not be damaged, and the quality of the composite geomembrane is uniform; the flat film extrusion film-forming hot air composite geomembrane production device allows online composite film formation with the geotextile after flat extrusion, which is highly efficient, energy-saving, low-carbon and environmentally friendly.

Description

Technical Field

[0001] The present application relates to a flat film extrusion film-forming hot air composite geomembrane production device and process, belonging to the technical field of geomembrane production. Background Art

[0002] Composite geomembrane is an impermeable material made of geotextile and geomembrane. It is mainly used for anti-seepage. The composite geomembrane has high physical and mechanical properties such as tensile strength, tear resistance and bursting resistance, and can meet the needs of civil engineering projects such as water conservancy, municipal engineering, construction, transportation, subway, tunnel, etc.

[0003] At present, traditional composite geomembranes are mostly produced by laminating laminating process or hot laminating process. The laminating laminating process uses the heated and molten polyethylene and other polymer materials to be directly cast onto porous base fabrics such as non-woven geotextiles, which has defects such as uneven film thickness and unqualified hydrostatic pressure resistance index; the hot laminating process is to heat the pre-produced blown polyethylene film and the base fabric on another set of far-infrared heating production line to heat-melt the film surface and laminate it with a cold rolling roller. In the process of processing, in order to avoid wrinkles on the softened geomembrane, the film needs to be stretched horizontally, resulting in a weak spot at the junction of the cloth and the membrane edge, affecting the use of the composite geomembrane. Summary of the invention

[0004] In order to solve the above problems, a flat film extrusion film-forming hot air composite geomembrane production device and process are provided. By arranging a film extrusion device and cooperating with a temperature-controlled multi-roll calender, a flat film extruded geomembrane is obtained, and the film surface is smooth and flat, and the thickness is uniform, so that the thickness of the final composite geomembrane can be guaranteed and the quality is stable; by arranging an industrial hot air blower and cooperating with a temperature-controlled multi-roll calender, the surface of the geomembrane after film formation is heated by the hot air of the industrial hot air blower, and is bonded with the geotextile and composited with the temperature-controlled multi-roll calender, the base film will not be damaged, no weak parts will be produced, and the quality of the composite geomembrane is uniform; the flat film extrusion film-forming hot air composite geomembrane production device allows the flat film to be composited with the geotextile online after flat extrusion, which is highly efficient, energy-saving, low-carbon and environmentally friendly.

[0005] According to one aspect of the present application, a flat film extrusion film-forming hot air composite geomembrane production device is provided, comprising a frame, a geotextile unwinding device, a film extrusion device, a temperature-controlled multi-roll calender, an industrial hot air blower, a cold-pressed composite roller assembly and a winding device; the film extrusion device is arranged on the frame, the geotextile unwinding device comprises a first geotextile unwinding device and a second geotextile unwinding device; the temperature-controlled multi-roll calender comprises a first roller, a second roller, a third roller, a fourth roller and a fifth roller which are arranged in sequence; the cold-pressed composite roller assembly comprises a first cold-pressed composite roller and a second cold-pressed composite roller; the industrial hot air blower heats the two surfaces of the geomembrane on the second roller and the third roller.

[0006] Optionally, the film extrusion device includes a multi-component metering and weighing mixing device, a screw extruder and a hanger-type flat-slit die head, the multi-component metering and weighing mixing device is connected to the screw extruder, and the hanger-type flat-slit die head is arranged at the discharge end of the screw extruder.

[0007] Optionally, the coat-hanger flat-slit die head is arranged between the first roller and the second roller to extrude the membrane sheet into a geomembrane.

[0008] Optionally, the winding device includes a traction machine, a trimming mechanism, a film storage rack, a winding machine and a transverse cutting mechanism, the trimming mechanism is arranged on the side of the traction machine away from the temperature-controlled multi-roll calender, and the film storage rack is arranged on the side of the trimming mechanism away from the traction machine; the transverse cutting mechanism is arranged on the side of the film storage rack away from the trimming mechanism; the winding machine is arranged on the side of the transverse cutting mechanism away from the film storage rack.

[0009] Optionally, the first geotextile unwinding device and the second geotextile unwinding device are arranged between the second roller and the third roller to achieve the lamination of the three-layer structure of the bottom geotextile, the geomembrane and the upper geotextile.

[0010] Optionally, the first cold-pressed composite roller is arranged next to the second roller to cooperate with the second roller to achieve the pressing of the bottom geotextile and the geomembrane; the second cold-pressed composite roller is arranged next to the third roller to cooperate with the third roller to achieve the pressing of the upper geotextile and the geomembrane; a tension roller is provided between the fifth roller and the traction machine.

[0011] Specifically, a fabric supporting roller is provided between the first geotextile unwinding device and the second roller, and between the second geotextile unwinding device and the third roller.

[0012] Optionally, the first roller is a rubber roller, and the second roller, the third roller, the fourth roller, the fifth roller, the first cold-pressed composite roller and the second cold-pressed composite roller are all steel rollers.

[0013] According to another aspect of the present application, a flat film extrusion film forming hot air composite geomembrane production process is also provided, using the above-mentioned flat film extrusion film forming hot air composite geomembrane production device, comprising the following steps:

[0014] (1) Membrane extrusion: Add the raw materials for geomembrane production into a multi-component metering and weighing mixing device, and melt extrude them through a screw extruder and a coat hanger type flat seam die to obtain a sheet of geomembrane;

[0015] (2) Calendering: The membrane sheet enters between the first roller and the second roller and is squeezed into a smooth and flat geomembrane with uniform thickness;

[0016] (3) Bonding of bottom geotextile: The bottom geotextile passes through the first geotextile unwinding device and the first cold-pressed composite roller, and enters the temperature-controlled multi-roll calender between the second roller and the first cold-pressed composite roller, and is bonded to one side of the flat film heated by the industrial hot air blower;

[0017] (4) Lamination of the upper geotextile: Before the geomembrane enters the third roller, the industrial hot air blower heats the geomembrane with hot air. The upper geotextile passes through the second geotextile unwinding device and the second cold-pressed composite roller, and enters the temperature-controlled multi-roll calender between the second cold-pressed composite roller and the third roller, and passes through the fourth roller and the fifth roller to form a composite geomembrane.

[0018] (5) Rolling: The finished geomembrane is subjected to a trimming mechanism, a film storage rack, and a winding machine to obtain a geomembrane roll of a fixed length. The transverse cutting mechanism cuts the geomembrane in the width direction of the geomembrane to obtain a finished geomembrane roll.

[0019] Optionally, the extrusion temperature in step (1) is 170-250°C; the thickness of the geomembrane in step (2) is 0.3 mm-2.5 mm; and the hot air temperature of the industrial hot air blower in steps (3) and (4) is 200°C-300°C.

[0020] Specifically, the extrusion temperature in step (1) is 170-250°C. Under this temperature condition, the feed speed and flow rate are controlled by a quantitative feeding mechanism to ensure the stability of the extrusion process. In the melting stage, the plastic particles are continuously squeezed, rubbed, heated and melted to form a uniform melt; in the extrusion stage, the melt passes through the die to form the desired product, and is extruded at a certain speed through the die outlet.

[0021] Specifically, the hot air temperature in step (3) and step (4) is 200-300°C. Under this temperature condition, the surface of the flat film after extrusion can be softened and combined with the cloth to achieve higher production efficiency.

[0022] Optionally, the temperature of the second roller is 85°C to 95°C, the temperature of the third roller is 75°C to 85°C, the temperature of the fourth roller is 65°C to 75°C, and the temperature of the fifth roller is 55°C to 65°C.

[0023] Specifically, the present application defines the temperature of the roller, under which the molding shrinkage and dimensional stability of the film can be controlled to be optimal.

[0024] The beneficial effects of this application include but are not limited to:

[0025] 1. According to the flat film extrusion film forming hot air composite geomembrane production device of the present application, by setting the film extrusion device and the temperature-controlled multi-roll calender to cooperate, the flat film extruded geomembrane is obtained, the film surface is smooth and flat, the thickness is uniform, so that the thickness of the final composite geomembrane can be guaranteed and the quality is stable; by setting the industrial hot air blower and the temperature-controlled multi-roll calender to cooperate, the surface of the geomembrane after film formation is heated by the hot air of the industrial hot air blower, and the geotextile is laminated by the temperature-controlled multi-roll calender, the base film will not be damaged, no weak parts will be generated, and the quality of the composite geomembrane is uniform; the flat film extrusion film forming hot air composite geomembrane production device allows the flat extrusion film to be composited with the geotextile online after film formation, which is efficient, energy-saving, low-carbon and environmentally friendly.

[0026] 2. According to the flat film extrusion film forming hot air composite geomembrane production device of the present application, by setting the first geotextile unwinding device and the second geotextile unwinding device, the bottom geotextile and the upper geotextile enter the temperature-controlled multi-roll calender, are compounded with the geomembrane, and the composite film is formed online, which simplifies the operation steps and improves the efficiency; by setting the first cold-pressed composite roller and the second cold-pressed composite roller, respectively cooperating with the second roller and the third roller, the bottom geotextile and the geomembrane, and the upper geotextile and the geomembrane are bonded.

[0027] 3. According to the flat film extrusion film forming hot air composite geomembrane production device of the present application, by setting a temperature-controlled multi-roll calender, on the one hand, the film sheet can be extruded to obtain a geomembrane with a smooth surface and uniform thickness, and on the other hand, the bottom geotextile and the upper geotextile can be composited with the geomembrane online, which is simple and efficient; and the roller temperature, roller gap, and roller pressure are controllable and adjustable to meet the production requirements of different composite geomembranes.

[0028] 4. According to the flat film extrusion film forming hot air composite geomembrane production process of the present application, the process steps are simplified, the operation is simple, and the energy saving and high efficiency are achieved; by limiting the process parameters such as the temperature of each roller, the extrusion temperature, and the hot air temperature, the obtained composite geomembrane is of excellent quality, and the quality stability and uniformity as well as the production efficiency are improved; the production process provided by the present application has a wide range of application, and is applicable to various geotextiles and various polymer materials such as polyethylene, polypropylene, and polyvinyl chloride, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 It is a schematic diagram of the process of the flat film extrusion film-forming hot air composite geomembrane production device involved in the embodiment of the present application;

[0031] Figure 2This is a schematic structural diagram of the geotextile unwinding device, temperature-controlled multi-roll calender, and industrial hot air blower involved in the embodiment of the present application.

[0032] List of parts and reference numerals:

[0033] 1. Frame; 2. First geotextile unwinding device; 3. Second geotextile unwinding device; 4. Multi-component metering, weighing and mixing device; 5. Screw extruder; 6. Hanger-type flat-seam die head; 7. First roller; 8. Second roller; 9. Third roller; 10. Fourth roller; 11. Fifth roller; 12. Industrial hot air blower; 13. Fabric support roller; 14. First cold-pressed composite roller; 15. Second cold-pressed composite roller. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0035] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0037] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0041] refer to Figure 1-Figure 2 The embodiment of the present application discloses a flat film extrusion film-forming hot air composite geomembrane production device, including a frame 1, a geotextile unwinding device, a film extrusion device, a temperature-controlled multi-roll calender, an industrial hot air blower 12, a cold-pressed composite roller assembly and a winding device; the film extrusion device is arranged on the frame 1, the geotextile unwinding device includes a first geotextile unwinding device 2 and a second geotextile unwinding device 3; the temperature-controlled multi-roll calender includes a first roller 7, a second roller 8, a third roller 9, a fourth roller 10 and a fifth roller 11 arranged in sequence; the cold-pressed composite roller assembly includes a first cold-pressed composite roller 14 and a second cold-pressed composite roller 15; the industrial hot air blower 12 heats the two surfaces of the geomembrane on the second roller 8 and the third roller 9.

[0042] Specifically, by arranging a film extrusion device in cooperation with a temperature-controlled multi-roll calender, a flat film extruded geomembrane is obtained, and the film surface is smooth and flat, and the thickness is uniform, so that the thickness of the final composite geomembrane can be guaranteed and the quality is stable; by arranging an industrial hot air blower 12 in cooperation with the temperature-controlled multi-roll calender, the surface of the geomembrane after film formation is heated by the hot air of the industrial hot air blower 12, and is bonded with the geotextile and composited with the temperature-controlled multi-roll calender, the base film will not be damaged, no weak parts will be generated, and the quality of the composite geomembrane is uniform; the flat film extrusion film-forming hot air composite geomembrane production device allows the flat extruded film to be composited with the geotextile online, which is highly efficient, energy-saving, low-carbon and environmentally friendly.

[0043] Specifically, the hot air temperature of the industrial hot air blower 12 is adjustable.

[0044] Specifically, the industrial hot air blower 12 has two air outlets, one air outlet is arranged at the second roller 8, and the surface of the geomembrane is heated by hot air to achieve the bonding of the bottom geotextile and the geomembrane; the other air outlet is arranged at the third roller 9, and the other surface of the geomembrane is heated by hot air to achieve the bonding of the upper geotextile and the geomembrane.

[0045] As an embodiment, the diaphragm extrusion device includes a multi-component metering and weighing mixing device 4, a screw extruder 5 and a hanger-type flat-slit die 6. The multi-component metering and weighing mixing device 4 is connected to the screw extruder 5, and the hanger-type flat-slit die 6 is arranged at the discharge end of the screw extruder 5.

[0046] Specifically, in the present application, the multi-component metering and weighing mixing device 4, the screw extruder 5 and the coat-hanger type flat-slit die head 6 are all commercially available devices.

[0047] As an embodiment, a coat-hanger type flat seam die 6 is disposed between the first roller 7 and the second roller 8 to extrude the membrane sheet into a geomembrane.

[0048] Specifically, the membrane is extruded through the coat-hanger flat-slit die 6 and enters between the first roller 7 and the second roller 8. The membrane is squeezed into a smooth and flat geomembrane to facilitate the subsequent bonding of the geotextile and the geomembrane.

[0049] Specifically, the present application does not make specific limitations on the temperature of the first roller 7 and the second roller 8, the gap and pressure between the first roller 7 and the second roller 8, and those skilled in the art may make selections based on actual conditions.

[0050] As an embodiment, the winding device includes a traction machine, a trimming mechanism, a film storage rack, a winding machine and a transverse cutting mechanism. The trimming mechanism is arranged on the side of the traction machine away from the temperature-controlled multi-roll calender, and the film storage rack is arranged on the side of the trimming mechanism away from the traction machine; the transverse cutting mechanism is arranged on the side of the film storage rack away from the trimming mechanism; and the winding machine is arranged on the side of the transverse cutting mechanism away from the film storage rack.

[0051] Specifically, the present application provides a traction machine, under the action of which the composite geomembrane moves forward at a uniform speed, and subsequent operations such as edge cutting, film storage, and winding are performed.

[0052] Specifically, the geomembrane is rolled up by a winder, and after the winder is finished, the geomembrane is cut by a transverse cutting mechanism, so that the rolled geomembrane can be easily carried by the staff. When the winder cannot roll up the geomembrane in time, the geomembrane can be temporarily stored by the film storage rack, so as to reduce the possibility of affecting the production efficiency.

[0053] As an implementation mode, the first geotextile unwinding device 2 and the second geotextile unwinding device 3 are arranged between the second roller 8 and the third roller 9 to achieve the lamination of the three-layer structure of the bottom geotextile, the geomembrane and the upper geotextile.

[0054] Specifically, the present application does not make specific limitations on the temperature, gap, and pressure of the second roller 8 and the third roller 9, and those skilled in the art may make selections based on actual conditions.

[0055] As an implementation mode, the first cold-pressed composite roller 14 is arranged next to the second roller 8 to cooperate with the second roller 8 to realize the pressing of the bottom geotextile and the geomembrane; the second cold-pressed composite roller 15 is arranged next to the third roller 9 to cooperate with the third roller 9 to realize the pressing of the upper geotextile and the geomembrane; a tension roller is provided between the fifth roller 11 and the traction machine.

[0056] Specifically, the present application does not make specific limitations on the gap, temperature, and pressure between the first cold-pressed composite roller 14 and the second roller 8, and technical personnel in the field can make choices based on actual conditions; the present application does not make specific limitations on the gap, temperature, and pressure between the second cold-pressed composite roller 15 and the third roller 9, and technical personnel in the field can make choices based on actual conditions.

[0057] Specifically, a fabric supporting roller 13 is provided between the first geotextile unwinding device 2 and the second roller 8 , and between the second geotextile unwinding device 3 and the third roller 9 .

[0058] As an implementation mode, the first roller 7 is a rubber roller, and the second roller 8, the third roller 9, the fourth roller 10, the fifth roller 11, the first cold-pressed composite roller 14 and the second cold-pressed composite roller 15 are all steel rollers.

[0059] The present application utilizes the above-mentioned flat film extrusion film forming hot air composite geomembrane production device to produce a flat film extrusion film forming hot air composite geomembrane, comprising the following steps:

[0060] (1) Film extrusion: Add the raw materials for geomembrane production into the multi-component weighing and mixing device 4, and melt-extrude through the screw extruder 5 and the coat-hanger type flat seam die head 6 to obtain a sheet-like geomembrane film;

[0061] (2) Calendering: The film enters between the first roller 7 and the second roller 8 and is squeezed into a smooth and flat geomembrane with uniform thickness;

[0062] (3) Bonding of bottom geotextile: The bottom geotextile passes through the first geotextile unwinding device 2 and the first cold-pressed composite roller 14, and enters the temperature-controlled multi-roll calender between the second roller 8 and the first cold-pressed composite roller 14, and is bonded to one side of the flat film heated by the industrial hot air blower;

[0063] (4) Lamination of the upper geotextile: Before the geotextile enters the third roller 9, the industrial hot air blower 12 heats the geotextile with hot air. The upper geotextile passes through the second geotextile unwinding device 3 and the second cold-pressed composite roller 15, and enters the temperature-controlled multi-roll calender between the second cold-pressed composite roller 15 and the third roller 9, and passes through the fourth roller 10 and the fifth roller 11 to form a composite geotextile.

[0064] (5) Rolling: The finished geomembrane is subjected to a trimming mechanism, a film storage rack, and a winding machine to obtain a geomembrane roll of a fixed length. The transverse cutting mechanism cuts the geomembrane in the width direction of the geomembrane to obtain a finished geomembrane roll.

[0065] As an embodiment, the extrusion temperature in step (1) is 170°C; the thickness of the geomembrane in step (2) is 2 mm; and the hot air temperature of the industrial hot air blower 12 in steps (3) and (4) is 200°C.

[0066] Specifically, the extrusion temperature in step (1) is 170°C. Under this temperature condition, the feed speed and flow rate are controlled by the quantitative feeding mechanism to ensure the stability of the extrusion process. In the melting stage, the plastic particles are continuously squeezed, rubbed, heated and melted to form a uniform melt; in the extrusion stage, the melt passes through the die to form the desired product, and is extruded at a certain speed through the die outlet.

[0067] As an embodiment, the temperature of the second roller 8 is 90°C, the temperature of the third roller 9 is 80°C, the temperature of the fourth roller 10 is 70°C, and the temperature of the fifth roller 11 is 60°C.

[0068] Specifically, the present application defines the temperature of the roller, under which the molding shrinkage and dimensional stability of the film can be controlled to be optimal.

[0069] Specifically, in the flat film extrusion hot air composite geomembrane production process provided by the present application, in step (3) and step (4), the two surfaces of the geomembrane, which already has a certain temperature, are heated by hot air from an industrial hair dryer, and with the cooperation of the first cold-pressed composite roller 14 and the second cold-pressed composite roller 15, they are bonded to the geotextiles on both sides and enter the subsequent rollers, and the cloth and the film are extruded and composited, and finally the geotextile is composited on both sides of the film to form a "sandwich structure" of cloth-membrane-cloth, and the base film is not damaged; the peel strength between the cloth and the film is moderate, and the two materials of the cloth and the film are combined, and the performance of each is guaranteed, while at the same time, they have a positive reinforcement function, and the quality is excellent and stable.

[0070] The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims

1. A flat film extrusion film forming hot air composite geomembrane production device, characterized in that: It comprises a frame (1), a geotextile unwinding device, a film extrusion device, a temperature-controlled multi-roll calender, an industrial hot air blower (12), a cold-pressed composite roller assembly and a winding device; the film extrusion device is arranged on the frame (1); the geotextile unwinding device comprises a first geotextile unwinding device (2) and a second geotextile unwinding device (3); the temperature-controlled multi-roll calender comprises a first roller (7), a second roller (8), a third roller (9), a fourth roller (10) and a fifth roller (11) which are arranged in sequence; the cold-pressed composite roller assembly comprises a first cold-pressed composite roller (14) and a second cold-pressed composite roller (15); the industrial hot air blower (12) heats the two surfaces of the geomembrane on the second roller (8) and the third roller (9); The first geotextile unwinding device (2) and the second geotextile unwinding device (3) are arranged between the second roller (8) and the third roller (9) to achieve lamination of the three-layer structure of the bottom geotextile, the geomembrane and the upper geotextile; The first cold-pressed composite roller (14) is arranged beside the second roller (8) to cooperate with the second roller (8) to achieve the pressing of the bottom layer of geotextile and geomembrane; the second cold-pressed composite roller (15) is arranged beside the third roller (9) to cooperate with the third roller (9) to achieve the pressing of the upper layer of geotextile and geomembrane; a tension roller is arranged between the fifth roller (11) and the traction machine.

2. The flat film extrusion film forming hot air composite geomembrane production device according to claim 1 is characterized in that: The film extrusion device comprises a multi-component metering and weighing mixing device (4), a screw extruder (5) and a hanger-type flat-slit die head (6); the multi-component metering and weighing mixing device (4) is connected to the screw extruder (5), and the hanger-type flat-slit die head (6) is arranged at the discharge end of the screw extruder (5).

3. The flat film extrusion film forming hot air composite geomembrane production device according to claim 2 is characterized in that: The hanger-type flat-seam die head (6) is arranged between the first roller (7) and the second roller (8) to extrude the membrane sheet into a geomembrane.

4. The flat film extrusion film forming hot air composite geomembrane production device according to claim 1 is characterized in that: The winding device includes a traction machine, a trimming mechanism, a film storage rack, a winding machine and a transverse cutting mechanism. The trimming mechanism is arranged on the side of the traction machine away from the temperature-controlled multi-roll calender, and the film storage rack is arranged on the side of the trimming mechanism away from the traction machine; the transverse cutting mechanism is arranged on the side of the film storage rack away from the trimming mechanism; and the winding machine is arranged on the side of the transverse cutting mechanism away from the film storage rack.

5. The flat film extrusion film forming hot air composite geomembrane production device according to claim 1 is characterized in that: The first roller (7) is a rubber roller, and the second roller (8), the third roller (9), the fourth roller (10), the fifth roller (11), the first cold-pressed composite roller (14) and the second cold-pressed composite roller (15) are all steel rollers.

6. A flat film extrusion film forming hot air composite geomembrane production process, using the flat film extrusion film forming hot air composite geomembrane production device according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Film extrusion: adding geomembrane production raw materials to a multi-component metering and weighing mixing device (4), and melt-extruded through a screw extruder (5) and a coat hanger type flat seam die head (6) to obtain a sheet-like geomembrane film; (2) Calendering: The membrane sheet enters between the first roller (7) and the second roller (8) and is squeezed into a smooth and flat geomembrane with uniform thickness; (3) Lamination of the bottom geotextile: The bottom geotextile passes through the first geotextile unwinding device (2) and the first cold-pressed composite roller (14), and enters the temperature-controlled multi-roll calender between the second roller (8) and the first cold-pressed composite roller (14), and is laminated with one side of the flat film that has been heated by the industrial hot air blower (12); (4) Lamination of the upper geotextile: Before the geotextile enters the third roller (9), the industrial hot air blower (12) heats the geotextile with hot air, and the upper geotextile passes through the second geotextile unwinding device (3) and the second cold-pressed composite roller (15), and enters the temperature-controlled multi-roll calender between the second cold-pressed composite roller (15) and the third roller (9), and passes through the fourth roller (10) and the fifth roller (11) to form a composite geotextile; (5) Rolling: The finished geomembrane is subjected to a trimming mechanism, a film storage rack, and a winding machine to obtain a geomembrane roll of a fixed length. The transverse cutting mechanism cuts the geomembrane in the width direction of the geomembrane to obtain a finished geomembrane roll.

7. The flat film extrusion hot air composite geomembrane production process according to claim 6 is characterized in that: The extrusion temperature in step (1) is 170 to 250°C; the thickness of the geomembrane in step (2) is 0.3 mm to 2.5 mm; and the hot air temperature of the industrial hot air blower (12) in steps (3) and (4) is 200 to 300°C.

8. The flat film extrusion hot air composite geomembrane production process according to claim 6, characterized in that: The temperature of the second roller (8) is 85°C to 95°C, the temperature of the third roller (9) is 75°C to 85°C, the temperature of the fourth roller (10) is 65°C to 75°C, and the temperature of the fifth roller (11) is 55°C to 65°C.

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