Film forming machine with roll belt cooling structure

Abstract

This invention discloses a film forming machine with a roller cooling structure. A film conveyor belt is wound around tension roller one, tension roller two, cooling roller three, cooling roller two, and cooling roller one. The film conveyor belt passes through a film temperature control device. This temperature control device includes a temperature control chamber, inside which two air-distributing perforated plates are fixedly installed. The film conveyor belt passes between the two parallel and spaced air-distributing perforated plates. The air-distributing perforated plates form temperature control cavities with the top and bottom walls of the temperature control chamber, and each temperature control cavity is divided into several temperature control unit cavities by temperature control cavity partitions. Each temperature control unit cavity is equipped with an electric heater, a cold air inlet, and a blower. Several corrugated guide plates are equidistantly arranged on the inner wall of cooling roller one and / or cooling roller two and / or cooling roller three, and spiral vanes are arranged on the outer wall of the inner cylinder. This film forming machine features high production efficiency and excellent product quality.

Description

Technical Field

[0001] This invention relates to a production equipment for producing cast films, and more particularly to a cast film casting machine comprising a molten film conveyor belt and a cooling roller structure. Background Technology

[0002] Film casting has the advantages of simple equipment, continuous operation, and high production efficiency. The effectiveness of cooling and temperature control during the casting process directly affects the production speed and quality of the film. Currently, film casting equipment mainly consists of a film extrusion die and multiple pairs of opposing rollers. The main function of these roller pairs is to cool and shape the extruded film and to press patterns onto it. The main casting processes are essentially two methods: one is to first emboss the rollers and then cool and shape it; the other is to first cool and shape it and then emboss it. Correspondingly, film casting equipment still relies on rotating cooling rollers for cooling. In this structure, since the contact angle and arc length between the film and the cooling rollers are always fixed, to achieve the ideal cooling and shaping effect, the cooling time can only be extended by reducing the rotation speed of the cooling rollers. However, reducing the rotation speed of the cooling rollers inevitably leads to a decrease in the operating efficiency of the casting machine. Therefore, the existing structure that relies solely on cooling rollers for cooling and shaping the extruded film has become a bottleneck for improving the production efficiency of casting machines. The ambient temperature of the molten film extruded from the die directly affects the quality of the film. Improper temperature control can lead to inadequate raw material modification, insufficient coupling activation, and uneven stress in different parts of the film, which can easily cause defects such as wrinkles, cracks, and even holes. Obviously, existing film casting machines have not taken this technical characteristic into account, thus restricting the improvement of the quality of finished film products. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a film forming machine with a roller cooling structure, which can not only effectively improve the production efficiency of cast film, but also accurately control the cooling temperature of the cast roller to ensure the quality of the cast product.

[0004] To solve the above-mentioned technical problems, the present invention provides a film forming machine with a roller cooling structure, including an extrusion die, and cooling roller one, cooling roller two, and cooling roller three, as well as tension roller one and tension roller two; a film conveyor belt is wrapped around the tension roller one, tension roller two, cooling roller three, cooling roller two, and cooling roller one; the film conveyor belt passes through a film temperature control device; the film temperature control device includes a temperature control box, and two air distribution plates are fixedly installed inside the temperature control box, and the film conveyor belt passes through the middle of the two parallel and spaced air distribution plates;

[0005] The air distribution perforated plate forms a temperature control cavity between the top and bottom walls of the temperature control box, and each temperature control cavity is divided into several temperature control unit cavities by a temperature control cavity partition; each temperature control unit cavity is equipped with an electric heater, a cold air inlet and a blower; several through holes are evenly distributed on the surface of the air distribution perforated plate;

[0006] The cooling roller one and / or cooling roller two and / or cooling roller three includes an outer cylinder and an inner cylinder disposed within the outer cylinder cavity. The two ends of the outer cylinder are fixedly supported on the end shaft by corresponding outer cylinder end caps, and the two ends of the inner cylinder are fixedly supported on the end shaft by corresponding inner cylinder end caps. A cold water cavity is formed between the outer cylinder and the inner cylinder, which are spaced apart from each other. The end shaft center hole disposed on the end shaft leads to the cold water cavity through a cold water hole. A plurality of corrugated guide plates are equidistantly disposed on the inner cylinder wall of the outer cylinder, and helical blades are disposed on the outer cylinder wall of the inner cylinder.

[0007] Furthermore, the first and third cooling rollers are respectively positioned opposite each other on the front and rear sides of the second cooling roller; the extrusion die is located above the front end of the film conveyor belt.

[0008] Furthermore, the outer cylinder surface of the second cooling roller is provided with an embossed pattern; the outer cylinder surfaces of the first cooling roller and the third cooling roller are covered with a rubber coating layer.

[0009] Furthermore, the adhesive film conveyor belt is a mesh belt or a woven belt; the belt surface of the adhesive film conveyor belt is provided with a patterned structure, which matches the embossed pattern on the second cooling roller.

[0010] Furthermore, the cold air duct is connected to one end of the cold air generating pipe, and the other end of the cold air generating pipe is connected to the air outlet of the blower. The cold air generating pipe is installed in the chilled water tank. The circulating water inlet of the chilled water tank is connected to the water outlet of the chiller. The circulating water outlet of the chilled water tank is connected to the water inlet of the chiller.

[0011] Furthermore, the cold air duct outlet is connected to the cold air generating duct end via a cold air duct control valve; the blower is an axial flow fan, the blower is a centrifugal fan, and the cold air fan is a compression chiller; the cold air duct control valve is an electromagnetic shut-off valve.

[0012] Furthermore, the diameter d1 of the central hole of the corrugated guide disk is greater than the outer diameter d2 of the spiral blade.

[0013] Furthermore, the distance between two adjacent corrugated guide disks is equal to the pitch of the spiral blade.

[0014] Furthermore, the cone apex angle α of the conical surface where the corrugated guide plate is located is 100°-150°, and the wall of the corrugated guide plate is a corrugated surface disposed on the conical surface.

[0015] In the technical solution of this invention, since a film conveyor belt is stretched around the cooling roller group, tensioning roller group, and conveyor belt correction device, the relatively high-temperature molten film extruded from the extrusion die does not directly enter the cooling rollers for cooling. Instead, the molten extruded film enters the film conveyor belt for temperature-controlled casting and shaping. On the one hand, the molten film can obtain sufficient film shaping time and shaping path length on the conveyor belt, without being limited by the size and arc length of the cooling wrap angle of the cooling rollers. This can greatly increase the conveying speed of the film on the conveyor belt, thereby greatly improving the casting production efficiency of the casting machine. On the other hand, the film can form a uniform film surface pattern on the contact surface with the conveyor belt. During the film conveying process, process parameters such as the film conveying environment temperature can be controlled to obtain a film with more stable quality.

[0016] Furthermore, since the molten extruded film passes through the film temperature control device along with the film conveyor belt, the film temperature control device can adjust and control the cooling rate of the film and the duration of film temperature control through heating or cooling devices to create the optimal film environment temperature. Moreover, by setting different temperature control sections in the film temperature control device, precise temperature control can be achieved, ensuring that the film modification is in place, the coupling activation is sufficient, and the unevenness of the film stress in all directions can be effectively eliminated. Through the optimization of the film setting temperature, the formation of wrinkles, bursting, cracks, and holes in the film is completely avoided, thereby effectively improving and stabilizing the quality of the film product while ensuring the efficiency of casting production.

[0017] Furthermore, the corrugated guide plate installed on the inner wall of the outer cylinder increases the heat exchange contact area between the outer cylinder, the guide plate, and the cooling water. The conical corrugated plate wall also generates flow resistance and eddies in the cold water, extending the contact path and duration between the cold water and the outer cylinder and the corrugated plate wall, thus enhancing heat exchange and significantly improving the cooling effect of the outer cylinder. Simultaneously, the spiral vanes on the outer wall of the inner cylinder further increase the flow path of the cooling water in the cold water chamber, prolonging its residence time and further enhancing the heat exchange efficiency between the cooling water and the outer cylinder, resulting in a cooling roller structure with excellent cooling performance. This invention's structure is more conducive to continuous, large-scale production of cast film, improving production efficiency and ensuring the mechanical properties and product quality of the cast film. Attached Figure Description

[0018] The film forming machine with a roller cooling structure of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of a specific embodiment of the film forming machine with a roller cooling structure according to the present invention;

[0020] Figure 2 yes Figure 1 A cross-sectional view of the film temperature control device in the embodiment shown.

[0021] Figure 3 yes Figure 1 A cross-sectional view of the cooling roller in the embodiment shown;

[0022] Figure 4 yes Figure 3 Front view of the corrugated guide plate;

[0023] Figure 5 yes Figure 4 The left view.

[0024] In the diagram, 1—film conveyor belt, 2—tension roller 1, 3—extrusion die, 4—film, 5—film temperature control device, 501—temperature control chamber, 502—electric heater, 503—cold air duct inlet, 504—blower, 505—cold air duct control valve, 506—temperature control chamber partition, 507—air distribution perforated plate, 508—cold air generating pipe, 509—heat exchanger, 510—chilled water, 511—chiller. 512—Blower, 6—Tensioning roller II, 7—Cooling roller III, 8—Cooling roller II, 801—Outer cylinder, 802—Wave-shaped guide plate, 803—Outer cylinder end cover, 804—End shaft, 805—Cold water hole, 806—Inner cylinder end cover, 807—Cold water cavity, 808—Inner cylinder, 809—Spiral blade, 810—End shaft center hole, 9—Cooling roller I, 10—Guide roller I, 11—Guide roller II. Detailed Implementation

[0025] like Figure 1 The film forming machine shown has a roller cooling structure, including cooling roller 9, cooling roller 8, and cooling roller 7 rotatably supported on a film forming frame. Tensioning roller 2, tensioning roller 6, guide roller 10, and guide roller 21 are also rotatably supported on the film forming frame. An extrusion die 3 is movably suspended on a die support. A film conveyor belt 1 is wound around tensioning roller 2, tensioning roller 6, cooling roller 7, cooling roller 8, cooling roller 9, guide roller 10, and guide roller 21; the film conveyor belt 1 passes through a film temperature control device 5, which is mounted on the film forming frame.

[0026] Cooling rollers 7 and 9 are positioned opposite each other on either side of cooling roller 8. All three rollers (7, 8, and 9) are connected to corresponding circulating cooling water channels; cooling water enters the cooling chamber from one end of the roller for heat exchange and then flows out from the other end. Cooling roller 8, located in the middle, is made of steel and has embossed patterns on its outer surface, which correspond to or are identical to the embossed patterns on the film conveyor belt 1. The outer surfaces of cooling rollers 7 and 9 are covered with an adhesive layer, the material and structure of which are identical to those in the prior art. All three rollers (7, 8, and 9) are interconnected with their corresponding roller drive motors. Alternatively, at least one roller is connected to a corresponding roller drive motor. The film conveyor belt 1 is made of metal mesh belt, and the pattern of the metal mesh belt is consistent with the pattern of the outer cylinder surface of the cooling roller 8. Of course, the film conveyor belt 1 can also be made of woven fiber belt, and its pattern is also consistent with the pattern of the cylinder surface of the cooling roller 8.

[0027] The film temperature control device 5 is located near the extrusion die 3, and the horizontal section of the film conveyor belt 1 passes through the temperature control chamber of the film temperature control device 5. The extrusion die 3 is located above the front end of the horizontal section of the film conveyor belt 1. The extrusion die 3 is movably suspended on the die support, and the extrusion nozzle of the extrusion die 3 is inclined towards the upper surface of the film conveyor belt 1.

[0028] The molten film 4 extruded from the extrusion nozzle of the extrusion die 3 enters the horizontal section of the film conveyor belt 1 and passes through the temperature control chamber of the film temperature control device 5 along with the film conveyor belt 1. After passing through the rolling points of the opposing cooling rollers 8 and 7, it passes successively over the lower cylinder surface of the cooling roller 8 and the upper cylinder surface of the cooling roller 9, and becomes a molded film with embossed texture.

[0029] like Figure 2 The film temperature control device shown includes a temperature control box 501, which has a rectangular tube structure. Narrow input ports and output ports are respectively provided on the end plates at both ends of the rectangular tube structure of the temperature control box 501 for the film conveyor belt 1 and the film 4 on it to pass through and exit.

[0030] Two air-distributing perforated plates 507 are horizontally arranged at intervals within the cavity of the temperature control chamber 501, forming a horizontal channel between the two plates for the passage of the film conveyor belt 1 and the film 4. The upper air-distributing perforated plate 507 and the top wall of the temperature control chamber 501 form the upper temperature control cavity, and the lower air-distributing perforated plate 507 and the bottom wall of the temperature control chamber 501 form the lower temperature control cavity. Several circular through holes of the same diameter are evenly distributed on the air-distributing perforated plates 507.

[0031] Both the upper and lower temperature control chambers are divided into three temperature control unit chambers by a temperature control chamber partition 506. Each temperature control unit chamber is equipped with a blower 504 for supplying air to the unit chamber. A cold air inlet 503 and an electric heater 502 are installed on either side of the blower 504. The blower 504, cold air inlet 503, and electric heater 502 located in the upper temperature control unit chamber are mounted on the top wall of the temperature control box 501. Similarly, the blower 504, cold air inlet 503, and electric heater 502 located in the lower temperature control unit chamber are mounted on the bottom wall of the temperature control box 501.

[0032] The heat exchanger 509 is a closed cabinet containing chilled water 510, which is purified or pure water. The circulating water outlet of the heat exchanger 509 is connected to the inlet of the chiller 511, and the circulating water inlet of the heat exchanger 509 is connected to the outlet of the chiller 511. A cold air generating pipe 508 is immersed in the chilled water 510 in the heat exchanger 509. Both ends of the cold air generating pipe 508 extend out of the cabinet wall of the heat exchanger 509. The lower end of the cold air generating pipe 508 is connected to the air outlet of the blower 512, and the upper end of the cold air generating pipe 508 is connected to the corresponding cold air duct port 503 through a cold air duct control valve 505, which is a solenoid shut-off valve. The chiller 511 is a common compressor-type air cooler; the blower 504 is an axial flow fan; and the blower 512 is a centrifugal fan.

[0033] In the above structure, since both the upper and lower temperature control chambers are divided into several temperature control unit chambers, the temperature of the adhesive film 4 on the adhesive film conveyor belt 1 can be adjusted and controlled in sections. This allows for different heating and activation temperature parameters to be applied to different adhesive film material components, achieving ideal modification and activation effects. Accordingly, the number of temperature control unit chambers separating the upper and lower temperature control chambers is not limited to three, but should be determined according to specific design conditions. The temperature control unit chambers can form a uniform temperature-controlled airflow through the homogenization effect of the chambers. The temperature-controlled airflow in the chambers is then blown onto the adhesive film conveyor belt 1 and the adhesive film 4 on it through the air distribution plate 507, so that the temperature-controlled airflow acts evenly on the upper and lower surfaces of the adhesive film.

[0034] like Figure 3The specific structure of the cooling rollers in this invention is shown. Cooling roller 1 (9), cooling roller 2 (8), and cooling roller 3 (7) all adopt the same structure, or at least one of them adopts the cooling roller structure described below. In this embodiment, the cooling rollers include an outer cylinder 801 and an inner cylinder 808 that are spaced apart from each other, and end shafts 804 located at both ends. The same end of the outer cylinder 801 and the inner cylinder 808 are respectively fixedly mounted on the end shaft 804 at the same end via an outer cylinder end cap 803 and an inner end cap 806 at the same end. The outer cylinder end cap 803 and the inner end cap 806 at the same end are spaced apart from each other. A cold water chamber 807 is formed between the spaced-apart outer cylinder 801 and the inner cylinder 808, and a cylinder end cold water channel is formed between the outer cylinder end cap 803 and the inner cylinder end cap 806 at the same end. An end shaft center hole 810 is provided in the center of the end shaft 804, and the end shaft center hole 810 leads to the cold water chamber 807 through a cold water hole 805 on the end shaft 804 and the cylinder end cold water channel.

[0035] Several corrugated guide plates 802 are fixedly arranged at equal intervals on the inner wall of the outer cylinder 801, and a spiral blade 809 is fixedly arranged on the outer wall of the inner cylinder 808, with the outer diameter d2 of the cylinder at the top of the spiral blade 809.

[0036] like Figure 4 and Figure 5 As shown, the corrugated guide disk 802 is generally a conical disk structure. The apex angle α of the cone containing the disk is 120°, and the apex angle α of the conical surface can also preferably be between 100° and 150°. The wall of the corrugated guide disk 802 is corrugated, and the diameter of the central circular hole of the corrugated guide disk 802 is d1. The diameter d1 of the central hole of the corrugated guide disk 802 is larger than the outer diameter d2 of the propeller blade 809. The spacing between two adjacent corrugated guide disks 802 is equal to the pitch of the propeller blade 809.

[0037] Because a corrugated guide plate 802 is installed on the inner wall of the outer cylinder 801, on the one hand, the corrugated guide plate 802 increases the heat exchange contact area between the outer cylinder and the guide plate and the cooling water; on the other hand, the conical corrugated plate wall can generate cold water flow resistance and eddies at the plate wall, prolonging the contact path and duration between the cold water and the outer cylinder and the corrugated plate wall, enhancing the heat exchange between the cooling water and the outer cylinder, and greatly improving the cooling effect of the outer cylinder. At the same time, the spiral vanes 809 installed on the outer wall of the inner cylinder 808 further increase the flow path length of the cooling water in the cold water cavity 807, prolonging the residence time of the cooling water in the cold water cavity 807, further enhancing the heat exchange efficiency between the cooling water and the outer cylinder, forming a cooling roller structure with good cooling effect.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. Many modifications and variations can be made based on the content of this specification. The selection and detailed description of these embodiments are intended to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize it. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A film forming machine with a roller cooling structure, comprising an extrusion die (3), and cooling roller one (9), cooling roller two (8) and cooling roller three (7), characterized in that: It also includes tension roller one (2) and tension roller two (6); a film conveyor belt (1) is wrapped around the tension roller one (2), tension roller two (6), cooling roller three (7), cooling roller two (8) and cooling roller one (2); the extrusion die (3) is located above the front end of the film conveyor belt (1); The film conveyor belt (1) passes through the film temperature control device (5); the film temperature control device (5) includes a temperature control box (501), and two air distribution plates (507) are fixedly installed inside the temperature control box (501). The film conveyor belt (1) passes through the middle of the two parallel and spaced air distribution plates (507). The air distribution perforated plate (507) forms a temperature control cavity between the top wall and the bottom wall of the temperature control box (501), and each temperature control cavity is divided into several temperature control unit cavities by a temperature control cavity partition (506); each temperature control unit cavity is provided with an electric heater (502), a cold air duct (503) and a blower (504); the surface of the air distribution perforated plate (507) is evenly distributed with several through holes; The cooling roller one (9) and / or cooling roller two (8) and / or cooling roller three (7) include an outer cylinder (801) and an inner cylinder (808) disposed within the cavity of the outer cylinder (801). The two ends of the outer cylinder (801) are fixedly supported on the end shaft (804) by corresponding outer cylinder end caps (803), and the two ends of the inner cylinder (808) are fixedly supported on the end shaft (804) by corresponding inner cylinder end caps (806). A cold water chamber (807) is formed between the outer cylinder (801) and the inner cylinder (808) which are spaced apart from each other. The end shaft center hole (810) on the end shaft (804) leads to the cold water chamber (807) through the cold water hole (805); a plurality of corrugated guide plates (802) are equidistantly arranged on the inner wall of the outer cylinder (801), and a spiral blade (809) is arranged on the outer wall of the inner cylinder (808); the diameter d1 of the center hole of the corrugated guide plate (802) is greater than the outer diameter d2 of the spiral blade (809); the spacing between two adjacent corrugated guide plates (802) is equal to the pitch of the spiral blade (809); The first cooling roller (9) and the third cooling roller (7) are respectively located on the front and rear sides of the second cooling roller (8). The outer cylinder surface of the second cooling roller (8) is provided with embossed patterns. The outer cylinder surfaces of the first cooling roller (9) and the third cooling roller (7) are covered with a rubber roller coating layer. The rubber film conveyor belt (1) is a mesh belt or a woven belt. The conveyor belt (1) has a patterned structure on its surface, which matches the embossed pattern on the cooling roller (8).

2. The film forming machine with a roller cooling structure according to claim 1, characterized in that; The cold air duct (503) is connected to one end of the cold air generating pipe (508), and the other end of the cold air generating pipe (508) is connected to the air outlet of the blower (512). The cold air generating pipe (508) is installed in the chilled water tank (509). The circulating water inlet of the chilled water tank (509) is connected to the water outlet of the chiller (511). The circulating water outlet of the chilled water tank (509) is connected to the water inlet of the chiller (511).

3. The film forming machine with a roller cooling structure according to claim 1 or 2, characterized in that: The cold air duct (503) is connected to the end of the cold air generating duct (508) through the cold air duct control valve (505); the blower (504) is an axial flow fan, the blower (512) is a centrifugal fan, and the chiller (511) is a compression chiller; the cold air duct control valve (505) is an electromagnetic shut-off valve.

4. The film forming machine with a roller cooling structure according to claim 1, characterized in that: The cone apex angle α of the conical surface where the corrugated guide plate (802) is located is 100°-150°, and the wall of the corrugated guide plate (802) is a corrugated surface provided on the conical surface.

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