Film forming machine with roller belt cooling structure

Abstract

The invention discloses a film forming machine with a roller belt cooling structure. A rubber film conveying belt is wound on a first tensioning roller, a second tensioning roller, a third cooling roller, a second cooling roller and a first cooling roller. The adhesive film conveying belt penetrates through the adhesive film temperature control device; the adhesive film temperature control device comprises a temperature control box body, two air uniformizing pore plates are fixedly mounted in the temperature control box body, and the adhesive film conveying belt penetrates through the middle of the two air uniformizing pore plates which are parallel to each other at an interval; temperature control cavities are formed between the air uniformizing pore plate and the top wall and the bottom wall of the temperature control box body, and each temperature control cavity is divided into a plurality of temperature control unit cavities through temperature control cavity partition plates; an electric heater, a cold air pipe opening and an air blower are arranged in each temperature control unit cavity; a plurality of wave-shaped flow guide discs are arranged on the inner cylinder wall of the first cooling roller or / and the second cooling roller or / and the third cooling roller at equal intervals, and spiral fins are arranged on the outer cylinder wall of the inner cylinder. The film forming machine has the characteristics of high production efficiency and excellent product quality.

Description

Technical Field

[0001] The invention relates to a production device for making a cast film, in particular to a film casting machine comprising a molten film conveyor belt and a cooling roller structure. Background Art

[0002] The film casting process has the advantages of simple equipment, continuous operation and high production efficiency. The cooling, temperature control and shaping effect of the film in the casting process directly affects the production speed and quality of the film. At present, the film casting equipment mainly includes a film extrusion mold and a corresponding pair of rollers that roll against each other. The main function of the rollers is to cool and shape the extruded film and press the film pattern. There are two main casting processes. One is to emboss the rollers first and then cool and shape them, and the other is to cool and shape them first and then emboss them. The corresponding film casting equipment has not gotten rid of the structural form of cooling by rotating cooling rollers. In this structure, since the contact angle and arc length of the film and the cooling roller are always fixed, in order to achieve the ideal cooling and shaping effect, the cooling time can only be extended by reducing the speed of the cooling roller. The reduction in the speed of the cooling roller will inevitably lead to a decrease in the operating efficiency of the casting machine. Therefore, the existing structure that only relies on the cooling roller to cool and shape the extruded film has become a bottleneck for improving the production efficiency of the casting machine. The ambient temperature of the molten film extruded from the extrusion die will have a direct impact on the quality of the film. Improper temperature control will result in inadequate modification of the raw materials, insufficient coupling activation, and uneven stress in various parts of the film, which can easily cause the film to wrinkle, crack, or even have defects such as holes. Obviously, the existing film cast molding machines have not paid attention to this technical feature, which has also restricted the improvement of the quality of the finished film. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, 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 the cast film, but also accurately control the cooling temperature of the casting roller to ensure the quality of the cast product.

[0004] In order to solve the above technical problems, the film forming machine with a roller cooling structure of the present invention comprises an extrusion die, and cooling rollers 1, 2 and 3, and also tensioning rollers 1 and 2; a film conveyor belt is wound around the tensioning rollers 1, 2, 3, 2 and 1; the film conveyor belt passes through a film temperature control device; the film temperature control device comprises a temperature control box, in which two uniform air holes are fixedly installed, and the film conveyor belt passes through the middle of the two parallel and spaced uniform air holes;

[0005] The air uniformity orifice plates respectively form a temperature control cavity with the top wall and the bottom wall of the temperature control box, and each temperature control cavity is divided into a plurality of temperature control unit cavities by the temperature control cavity partition; the temperature control unit cavities are each provided with an electric heater, a cold air pipe port and a blower; the plate surface of the air uniformity orifice plates is uniformly provided with a plurality of through holes;

[0006] The cooling roller one and / or cooling roller two and / or cooling roller three include an outer cylinder and an inner cylinder arranged in the cylinder cavity of the outer cylinder, the two ends of the outer cylinder are fixedly supported on the end shaft through the outer cylinder end covers at the corresponding ends, and the two ends of the inner cylinder are fixedly supported on the end shaft through the inner cylinder end covers at the corresponding ends; a cold water cavity is formed between the outer cylinder and the inner cylinder arranged at intervals from each other, and the end axis center hole arranged on the end shaft leads to the cold water cavity through the cold water hole; a plurality of corrugated guide plates are equidistantly arranged on the inner cylinder wall of the outer cylinder, and spiral winglets are arranged on the outer cylinder wall of the inner cylinder.

[0007] Furthermore, the cooling roller one and the cooling roller three are respectively located opposite to each other at the front and rear sides of the cooling roller two; and the extrusion die is located above the front end of the film conveyor belt.

[0008] Furthermore, an embossed pattern is arranged on the outer cylinder surface of the cooling roller 2; and a rubber roller coating layer is coated on the outer cylinder surfaces of the cooling roller 1 and the cooling roller 3.

[0009] Furthermore, the film conveyor belt is a mesh belt or a woven belt; a pattern structure is arranged on the belt surface of the film conveyor belt, and the pattern structure is consistent with the embossed pattern on the second cooling roller.

[0010] Furthermore, the cold air pipe outlet is connected to one end of the cold air generating pipe, the other end of the cold air generating pipe is connected to the air outlet of the blower, and the cold air generating pipe is arranged in the cold water cabinet; the circulating water inlet of the cold water cabinet is connected to the water outlet of the chiller; the circulating water outlet of the cold water cabinet is connected to the water inlet of the chiller.

[0011] Furthermore, the cold air pipe outlet is connected to the cold air generating pipe end through a cold air pipe control valve; the hair dryer is an axial flow fan, the blower is a centrifugal fan, the cold air fan is a compression chiller; the cold air pipe control valve is an electromagnetic stop valve.

[0012] Furthermore, the diameter d1 of the central hole of the corrugated guide plate is larger than the outer diameter d2 of the spiral wing.

[0013] Furthermore, the spacing distance between two adjacent corrugated guide plates is equal to the pitch of the spiral wing.

[0014] Furthermore, the cone vertex 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 arranged on the conical surface.

[0015] In the technical solution of the present invention, since a film conveyor belt is stretched around the cooling roller group, the tensioning roller group and the conveyor belt correction device, the film in a molten state extruded by the extrusion mold with a relatively high temperature does not directly enter the counter-roll cooling roller for cooling, but the extruded film in a molten state 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 restricted by the cooling wrap angle size and wrap angle arc length of the cooling roller, so that the conveying speed of the film on the conveyor belt can be greatly improved, 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, the 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 be used to adjust the cooling speed of the film and the film temperature control time by means of a heating or cooling device to create an optimal film environment temperature; and different temperature control sections can be set in the film temperature control device to achieve precise temperature control, so that the film modification is in place, the coupling activation is sufficient, and the uneven stress in all directions of the film can be effectively eliminated. By optimizing the above-mentioned film setting temperature, the film can be completely prevented from wrinkling and bursting, as well as defects such as cracks and holes, thereby effectively improving and stabilizing the quality of the film product while ensuring the efficiency of the cast film production.

[0017] Also, since a corrugated guide plate is installed on the inner cylinder wall of the outer cylinder, on the one hand, the arrangement of the corrugated guide plate increases the heat exchange contact area between the outer cylinder body and the guide plate and the cooling water, and on the other hand, the use of a conical corrugated plate wall can generate cold water flow resistance and eddy current at the plate wall, prolonging the contact path and duration between the cold water and the outer cylinder and the corrugated plate wall, strengthening the heat exchange between the cooling water and the outer cylinder, and greatly improving the refrigeration effect of the outer cylinder. At the same time, spiral fins are arranged on the outer wall of the inner cylinder, which increases the flow path length of the cooling water in the cold water cavity, prolongs the residence time of the cooling water in the cold water cavity, further enhances the heat exchange efficiency between the cooling water and the outer cylinder, and forms a cooling roller structure with good refrigeration effect. The structure of the present invention is more conducive to the continuous and large-scale production of film casting, improves the casting production efficiency, and ensures the mechanical properties and product quality of the cast film. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of the film temperature control device in the embodiment shown;

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

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

[0023] Figure 5 yes Figure 4 Left view of .

[0024] In the figure, 1 is a film conveyor belt, 2 is a tensioning roller, 3 is an extrusion die, 4 is a film, 5 is a film temperature control device, 501 is a temperature control box, 502 is an electric heater, 503 is a cold air pipe outlet, 504 is a hair dryer, 505 is a cold air pipe control valve, 506 is a temperature control chamber partition, 507 is a uniform air hole plate, 508 is a cold air generating pipe, 509 is a heat exchange cabinet, 510 is a refrigerant water, 511 is a chiller, 512—blower, 6—tensioning roller 2, 7—cooling roller 3, 8—cooling roller 2, 801—outer cylinder, 802—wavy 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 wing, 810—end axial hole, 9—cooling roller 1, 10—guide roller 1, 11—guide roller 2. DETAILED DESCRIPTION

[0025] like Figure 1 The film forming machine with a roller belt cooling structure shown in the figure comprises cooling roller 1 9, cooling roller 2 8 and cooling roller 3 7 rotatably supported on the film forming frame, and tensioning roller 1 2, tensioning roller 2 6, guide roller 1 10 and guide roller 2 11 are also rotatably supported on the film forming frame. The extrusion die 3 is movably suspended on the die support. A film conveyor belt 1 is wound around tensioning roller 1 2, tensioning roller 2 6, cooling roller 3 7, cooling roller 2 8, cooling roller 1 9, guide roller 1 10 and guide roller 2 11; the film conveyor belt 1 passes through a film temperature control device 5, and the film temperature control device 5 is installed on the film forming frame.

[0026] The cooling roller 3 7 and the cooling roller 1 9 are respectively located on both sides of the cooling roller 2 8 in opposite directions. The cooling roller 3 7, the cooling roller 2 8 and the cooling roller 1 9 are all connected with the corresponding circulating cooling water circuit, that is, the cooling water enters the roller cooling cavity from one end of the roller for heat exchange and then flows out from the other end of the roller cooling cavity. The cooling roller 2 8 located in the middle position is a steel roller, and an embossed pattern is formed on the outer cylinder surface of the steel roller, and the embossed pattern corresponds to or is the same as the embossed pattern of the film conveyor belt 1. The outer cylinder surfaces of the cooling roller 3 7 and the cooling roller 2 9 are coated with a rubber layer, and the material and structure of the rubber layer are the same as those in the prior art. The cooling roller 3 7, the cooling roller 2 8 and the cooling roller 1 9 are all connected to the corresponding roller drive motor in a transmission manner. Or at least one roller is connected to the corresponding roller drive motor in a transmission manner. The film conveyor belt 1 adopts a metal mesh belt, and the belt surface pattern of the metal mesh belt is consistent with the outer cylinder surface pattern of the cooling roller 28. Of course, the film conveyor belt 1 can also be a woven belt made of fiber weaving, and its belt surface pattern is also consistent with the cylinder surface pattern of the cooling roller 28.

[0027] The film temperature control device 5 is close to the extrusion die 3, and the horizontal section of the film conveyor belt 1 just passes through the temperature control cavity 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, and the extrusion die 3 is movably hoisted on the die bracket, and the extrusion port of the extrusion die 3 is tilted toward the upper belt surface of the film conveyor belt 1.

[0028] The molten film 4 extruded from the extrusion port of the extrusion die 3 enters the belt surface of the horizontal section of the film conveyor belt 1, and passes through the temperature control cavity of the film temperature control device 5 along with the film conveyor belt 1, and then passes through the opposing rolling points of the cooling roller 2 8 and the cooling roller 3 7, and then successively bypasses the lower cylinder surface of the cooling roller 2 8 and the upper cylinder surface of the cooling roller 1 9 to become a molded film with embossed texture.

[0029] like Figure 2 The film temperature control device shown in the figure comprises a temperature control box 501, which is a rectangular tube-shaped structure. Narrow input ports and output ports for the film conveyor belt 1 and the film 4 thereon to pass through and output are respectively arranged on the end plates at both ends of the temperature control box 501 with the rectangular tube-shaped structure.

[0030] Two uniform air holes 507 are arranged horizontally and spaced apart in the chamber of the temperature control chamber 501, and a horizontal passage for passing the film conveyor belt 1 and the film 4 is formed between the two uniform air holes 507. The uniform air holes 507 located on the upper side and the top chamber wall of the temperature control chamber 501 form an upper temperature control chamber, and the uniform air holes 507 located on the lower side and the bottom chamber wall of the temperature control chamber 501 form a lower temperature control chamber. A number of circular through holes of the same aperture are evenly distributed on the uniform air holes 507.

[0031] The upper temperature control cavity and the lower temperature control cavity are divided into three temperature control unit cavities by the temperature control cavity partition 506. A blower 504 for blowing air into the unit cavity is installed in each temperature control unit cavity, and a cold air pipe port 503 and an electric heater 502 are installed on both sides of the blower 504. The blower 504, the cold air pipe port 503 and the electric heater 502 in the upper temperature control unit cavity are installed on the top wall of the temperature control box 501, and similarly, the blower 504, the cold air pipe port 503 and the electric heater 502 in the lower temperature control unit cavity are installed on the bottom wall of the temperature control box 501.

[0032] The heat exchange cabinet 509 is a closed cabinet, and contains refrigerant water 510 in the heat exchange cabinet 509. The refrigerant water 510 uses purified water or pure water. The circulating water outlet of the heat exchange cabinet 509 is connected to the water inlet of the chiller 511, and the circulating water inlet of the heat exchange cabinet 509 is connected to the water outlet of the chiller 511. A cold air generating pipe 508 is immersed in the refrigerant water 510 of the heat exchange cabinet 509. Both ends of the cold air generating pipe 508 extend out of the cabinet wall of the heat exchange cabinet 509. The lower end of the cold air generating pipe 508 is connected to the air outlet of the blower 512. The upper end of the cold air generating pipe 508 is connected to the corresponding cold air pipe port 503 through the cold air pipe control valve 505. The cold air pipe control valve 505 is an electromagnetic stop valve. The chiller 511 is a common compression air cooler; the hair dryer 504 is an axial flow fan, and the blower 512 is a centrifugal fan.

[0033] In the above structure, since the upper temperature control chamber and the lower temperature control chamber are divided into a number of temperature control unit chambers, the film 4 on the film conveyor belt 1 can be temperature-controlled in sections, so that different heating and heating temperature parameter values ​​are implemented for different film material components to achieve ideal modification and activation effects. Accordingly, the number of temperature control unit chambers separated by the upper and lower temperature control chambers is not limited to three, and the number of separations should be determined according to specific design conditions. The temperature control unit chambers can be set to form a homogenized temperature control airflow through the homogenization effect of the chamber, and the temperature control airflow in the chamber is then blown to the film conveyor belt 1 and the film 4 thereon through the uniform air hole plate 507, so that the temperature control airflow acts evenly on the upper and lower surfaces of the film.

[0034] like Figure 3The specific structure of the cooling roller in the present invention is shown. The cooling roller 1 9, the cooling roller 2 8 and the cooling roller 3 7 all adopt the same structure, or at least one of them adopts the following cooling roller structure. The cooling roller in this embodiment includes an outer cylinder 801 and an inner cylinder 808 which are spaced apart from each other, and an end shaft 804 located at both ends. The same end of the outer cylinder 801 and the inner cylinder 808 are fixedly mounted on the end shaft 804 at the same end through the outer cylinder end cover 803 and the inner end cover 806 at the same end, respectively. The outer cylinder end cover 803 and the inner end cover 806 at the same end are spaced apart from each other. A cold water cavity 807 is formed between the outer cylinder 801 and the inner cylinder 808 which are spaced apart from each other, and a tube end cold water channel is formed between the outer cylinder end cover 803 and the inner cylinder end cover 806 which are spaced apart from each other. An end shaft center hole 810 is provided at the center of the end shaft 804, and the end shaft center hole 810 leads to the cold water cavity 807 through the cold water hole 805 on the end shaft 804 and the tube end cold water channel.

[0035] A plurality of corrugated guide plates 802 are fixedly arranged at equal intervals on the inner wall of the outer cylinder 801, and a spiral wing 809 is fixedly arranged on the outer wall of the inner cylinder 808. The outer diameter of the cylinder where the top of the spiral wing 809 is located is d2.

[0036] like Figure 4 and Figure 5 As shown, the corrugated guide plate 802 is generally a conical plate structure, and the cone vertex angle α of the cone where the conical plate is located is 120°, and the cone vertex angle α of the cone surface can also be preferably 100°-150°. The wall of the corrugated guide plate 802 is a corrugated surface, and the diameter of the central circular hole of the corrugated guide plate 802 is d1. The diameter d1 of the central hole of the corrugated guide plate 802 is greater than the outer diameter d2 of the spiral wing 809. The spacing distance between two adjacent wave guide plates 802 is equal to the pitch of the spiral wing 809.

[0037] Since the corrugated guide plate 802 is installed on the inner cylinder wall of the outer cylinder 801, on the one hand, the setting of the corrugated guide plate 802 increases the heat exchange contact area between the outer cylinder body and the guide plate and the cooling water, and on the other hand, the use of the conical corrugated plate wall can generate cold water flow resistance and vortex at the plate wall, prolonging the contact path and duration of the cold water with the outer cylinder and the corrugated plate wall, strengthening the heat exchange between the cooling water and the outer cylinder, and greatly improving the refrigeration effect of the outer cylinder. At the same time, the spiral fins 809 are arranged on the outer wall of the inner cylinder 808, which increases the flow path length of the cooling water in the cold water cavity 807, prolongs the residence time of the cooling water in the cold water cavity 807, further enhances the heat exchange efficiency between the cooling water and the outer cylinder, and forms a cooling roller structure with good refrigeration effect.

[0038] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work 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 a cooling roller 1 (9), a cooling roller 2 (8) and a cooling roller 3 (7), characterized in that: It also includes a tensioning roller one (2) and a tensioning roller two (6); a film conveyor belt (1) is wound around the tensioning roller one (2), the tensioning roller two (6), the cooling roller three (7), the cooling roller two (8) and the cooling roller one (2); the film conveyor belt (1) passes through a film temperature control device (5); the film temperature control device (5) includes a temperature control box (501), two uniform air holes (507) are fixedly installed in the temperature control box (501), and the film conveyor belt (1) passes through the middle of the two parallel and spaced uniform air holes (507); The uniform air hole plate (507) forms a temperature control cavity with the top wall and the bottom wall of the temperature control box (501), and each temperature control cavity is divided into a plurality of temperature control unit cavities by a temperature control cavity partition plate (506); The temperature control unit cavity is provided with an electric heater (502), a cold air pipe port (503) and a blower (504); the plate surface of the uniforming orifice plate (507) is evenly distributed with a plurality of through holes; The cooling roller one (9) or / and the cooling roller two (8) or / and the cooling roller three (7) comprises an outer cylinder (801) and an inner cylinder (808) arranged in the cylinder cavity of the outer cylinder (801); the two ends of the outer cylinder (801) are fixedly supported on the end shaft (804) through the outer cylinder end covers (803) at the corresponding ends, and the two ends of the inner cylinder (808) are fixedly supported on the end shaft (804) through the inner cylinder end covers (806) at the corresponding ends; a cold water cavity (807) is formed between the outer cylinder (801) and the inner cylinder (808) which are arranged at intervals from each other, and the end axis center hole (810) arranged on the end shaft (804) leads to the cold water cavity (807) through the cold water hole (805); a plurality of corrugated guide plates (802) are equidistantly arranged on the inner cylinder wall of the outer cylinder (801), and spiral fins (809) are arranged on the outer cylinder wall of the inner cylinder (808).

2. The film forming machine with a roller cooling structure according to claim 1, characterized in that: The cooling roller one (9) and the cooling roller three (7) are respectively located opposite to each other on the front and rear sides of the cooling roller two (8); the extrusion die (3) is located above the front end of the film conveyor belt (1).

3. The film forming machine with a roller cooling structure according to claim 2, characterized in that: The outer cylinder surface of the second cooling roller (8) is provided with an embossed pattern; the outer cylinder surfaces of the first cooling roller (9) and the third cooling roller (7) are covered with a rubber roller coating layer.

4. The film forming machine with a roller cooling structure according to claim 1, 2 or 3, characterized in that: The film conveyor belt (1) is a mesh belt or a woven belt; a pattern structure is arranged on the belt surface of the film conveyor belt (1), and the pattern structure is consistent with the embossed pattern on the second cooling roller (8).

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

6. The film forming machine with a roller cooling structure according to claim 1 or 5, characterized in that: The cold air pipe opening (503) is connected to the end of the cold air generating pipe (508) via a cold air pipe control valve (505); the hair dryer (504) is an axial flow fan, the blower (512) is a centrifugal fan, and the cold air fan (511) is a compression chiller; the cold air pipe control valve (505) is an electromagnetic stop valve.

7. The film forming machine with a roller cooling structure according to claim 1, characterized in that: The diameter d1 of the central hole of the corrugated guide plate (802) is greater than the outer diameter d2 of the spiral wing (809).

8. The film forming machine with a roller cooling structure according to claim 1, characterized in that: The spacing distance between two adjacent wavy guide plates (802) is equal to the pitch of the spiral wing (809).

9. The film forming machine with a roller cooling structure according to claim 1, 7 or 8, characterized in that: The cone vertex angle α of the conical surface where the wavy guide plate (802) is located is 100°-150°, and the plate wall of the wavy guide plate (802) is a corrugated surface arranged on the conical surface.

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