Two-way stretching device for PET (Polyethylene Terephthalate) film

Abstract

The utility model relates to the technical field of PET film processing equipment, in particular to a PET film two-way stretching device which comprises an unwinding assembly, a winding assembly, an auxiliary assembly, a heating box, a cooling assembly and a stretching assembly, and the unwinding assembly, the auxiliary assembly, the heating box, the cooling assembly and the winding assembly are sequentially arranged from right to left. A feeding port and a discharging port which are used for inputting and outputting a film are formed in the two ends of the heating box respectively, the stretching assembly is arranged in the heating box, a heating assembly used for heating the film is further arranged in the heating box, and the cooling assembly is used for reducing the temperature of the stretched film. The film stretching device has the effects of improving the problem that the stretching effect of the middle position is poor during two-way stretching of the film and improving the stretching quality of the film.

Description

Technical Field

[0001] The utility model relates to the field of PET film processing equipment technology, in particular to a PET film bidirectional stretching device. Background Art

[0002] The PET film biaxial stretching device is a device used to prepare polyester film (such as PET film). Through this device, the film can be stretched to obtain a stretching effect in both the longitudinal and transverse directions, thereby obtaining a biaxially stretched film with excellent performance. In the packaging industry, PET film is widely used. In the production and processing of PET film, the PET film needs to be stretched.

[0003] The existing Chinese patent with announcement number CN216032472U discloses a biaxial stretching device for producing light-resistant and moisture-resistant PET film, which includes a platform, two vertical plates are fixedly installed on the top of the platform, and the same horizontal plate is fixedly installed on the top of the two vertical plates. A mounting groove located between the two vertical plates is opened on the top of the platform, and a first motor is fixedly installed in the mounting groove. The output shaft end of the first motor extends out of the mounting groove and is fixedly installed with a placement seat, a heating groove is opened on the top of the placement seat, and an electric heating plate is fixedly installed on the bottom inner wall of the heating groove, a heat conducting plate is fixedly installed on the top of the placement seat, and a plurality of heat conducting sheets are fixedly installed at equal intervals on the bottom of the heat conducting plate.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when the above-mentioned device performs biaxial stretching on the PET film, the two ends of the film are fixed, and the stretching degree in the middle of the film is low during the stretching process, which can easily cause the stretching effect in the middle of the film to fail to achieve the expected stretching quality, and there are certain limitations. Utility Model Content

[0005] In order to improve the problem of poor stretching effect in the middle position of the film during biaxial stretching and improve the stretching quality of the film, the present application provides a PET film biaxial stretching device.

[0006] The present application provides a PET film biaxial stretching device adopts the following technical solution:

[0007] A PET film biaxial stretching device comprises a unwinding assembly, a winding assembly, an auxiliary assembly, a heating box, a cooling assembly and a stretching assembly, wherein the unwinding assembly, the auxiliary assembly, the heating box, the cooling assembly and the winding assembly are arranged in sequence from right to left, and a feed port and a discharge port for inputting and outputting a film are respectively provided at both ends of the heating box, the stretching assembly is arranged in the heating box, and a heating assembly for heating the film is also provided in the heating box, and the cooling assembly is used to reduce the temperature of the film after stretching.

[0008] Preferably, the unwinding assembly includes an unwinding rack, a first bearing block, an unwinding roller, and an unwinding motor. The unwinding rack is placed on one side of the feeding port of the heating box close to it. The unwinding rack is arranged in an inverted "U" shape. The first bearing block is connected to the unwinding rack, and one first bearing block is provided on each of the opposite sides of the unwinding rack. The unwinding roller is connected between the two first bearing blocks. The unwinding motor is connected to the unwinding rack, and the output shaft of the unwinding motor is coaxially connected to the roller shaft of the unwinding roller.

[0009] Preferably, the auxiliary assembly includes a fixing rack, a first auxiliary roller, a second auxiliary roller, a first moving rack, and a first lifting cylinder. The fixing rack is placed between the heating box and the unwinding rack. The fixing rack is arranged in an inverted "U" shape. The first auxiliary roller is connected to the fixing rack. The first lifting cylinder is connected to the top of the fixing rack. The first moving rack is connected to the end of the piston rod of the first lifting cylinder passing through the fixing rack. The second auxiliary roller is connected to the first moving rack. The first auxiliary roller and the second auxiliary roller are arranged in parallel, and the first auxiliary roller is located below the second auxiliary roller.

[0010] Preferably, the stretching assembly includes a second lifting cylinder, a lifting rack, and a stretching roller. The second lifting cylinder is connected to the heating box, and several second lifting cylinders are respectively provided on the upper and lower side walls of the heating box. The several second lifting cylinders are arranged along the length direction of the heating box, and the upper and lower rows of the second lifting cylinders are arranged in a staggered manner. The lifting rack is connected to the end of the piston rod of the second lifting cylinder penetrating into the heating box. The stretching roller is connected to the lifting rack, and the stretching roller is arranged in a direction perpendicular to the running route of the film.

[0011] Preferably, the heating assembly includes electric heating rods and a heat preservation board. The electric heating rods are connected inside the heating box, and several electric heating rods are respectively provided on the opposite sides of the heating box. The electric heating rods are arranged along the width direction of the heating box. The heat preservation board is connected to the inner wall of the heating box.

[0012] Preferably, the cooling assembly includes a mounting rack, a first cooling roller, a second cooling roller, a second moving rack, and a third lifting cylinder. The mounting rack is placed on one side of the discharging port of the heating box close to it. The mounting rack is arranged in an inverted "U" shape. The first cooling roller is connected to the mounting rack. The third lifting cylinder is connected to the top of the mounting rack. The second moving rack is connected to the end of the piston rod of the third lifting cylinder passing through the mounting rack. The second cooling roller is connected to the second moving rack. The first cooling roller and the second cooling roller are arranged in parallel, and the first cooling roller is located below the second cooling roller.

[0013] Preferably, the winding assembly includes a winding frame, second bearing seats, a winding roller, a winding motor, a pressing cylinder, and a pressing plate. The winding frame is placed on one side of the cooling assembly. The winding frame is arranged in an inverted "U" shape. The second bearing seats are connected to the winding frame, and one second bearing seat is provided on each of the opposite sides of the winding frame. The winding roller is connected between the two second bearing seats. The winding motor is connected to the winding frame, and the output shaft of the winding motor is coaxially connected to the roller shaft of the winding roller. The pressing cylinder is connected to the top of the winding frame, and the pressing plate is connected to the end of the piston rod of the pressing cylinder passing through the winding frame. The pressing plate is arranged in a direction parallel to the axis of the winding roller.

[0014] In summary, the present application includes the following beneficial technical effects:

[0015] A PET film biaxial stretching device provided by the present utility model includes an unwinding assembly, a winding assembly, an auxiliary assembly, a heating box, a cooling assembly, a stretching assembly, and a heating assembly. Before operation, the film on the unwinding assembly is sequentially passed through the auxiliary assembly, the stretching assembly in the heating box, and the cooling assembly, and then fixed to the winding assembly. During stretching, the heating assembly in the heating box is used to heat the film to improve its ductility, and the stretching assembly is used to perform multi-stage stretching on the film in the heating box to make the stretching uniform, thereby solving the problem of poor stretching effect at the middle position during the biaxial stretching of the film and improving the stretching quality of the film. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the PET film biaxial stretching device in the embodiment of the present application;

[0017] Figure 2 is a schematic diagram for showing the internal structure of the heating box in the embodiment of the present application.

[0018] Description of the reference numerals: 1. Unwinding assembly; 11. Unwinding frame; 12. First bearing seat; 13. Unwinding roller; 14. Unwinding motor; 2. Auxiliary assembly; 21. Fixed frame; 22. First auxiliary roller; 23. Second auxiliary roller; 24. First moving frame; 25. First lifting cylinder; 3. Stretching assembly; 31. Second lifting cylinder; 32. Lifting frame; 33. Stretching roller; 4. Heating box; 41. Feed inlet; 42. Discharge outlet; 5. Heating assembly; 51. Electric heating rod; 52. Heat preservation board; 6. Cooling assembly; 61. Mounting frame; 62. First cooling roller; 63. Second cooling roller; 64. Second moving frame; 65. Third lifting cylinder; 7. Winding assembly; 71. Winding frame; 72. Second bearing seat; 73. Winding roller; 74. Winding motor; 75. Pressing cylinder; 76. Pressing plate. Detailed Description of the Embodiment

[0019] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the solution in the embodiments of the present utility model with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0021] The embodiment of the present application discloses a biaxial stretching device for PET films. Referring to Figure 1 and Figure 2 , the biaxial stretching device for PET films includes an unwinding assembly 1, a winding assembly 7, an auxiliary assembly 2, a heating box 4, a cooling assembly 6, and a stretching assembly 3. The unwinding assembly 1, the auxiliary assembly 2, the heating box 4, the cooling assembly 6, and the winding assembly 7 are arranged in sequence from right to left. Feed ports 41 and discharge ports 42 for film input and output are respectively opened at both ends of the heating box 4. The stretching assembly 3 is arranged inside the heating box 4. A heating assembly 5 for heating the film is further provided inside the heating box 4. The cooling assembly 6 is used to reduce the temperature of the stretched film.

[0022] The unwinding assembly 1 includes an unwinding frame 11, a first bearing seat 12, an unwinding roller 13, and an unwinding motor 14. The unwinding frame 11 is placed on one side close to the feed port 41 of the heating box 4. The unwinding frame 11 is arranged in an inverted "U" shape. The first bearing seat 12 is connected to the unwinding frame 11, and one first bearing seat 12 is provided on each of the opposite sides of the unwinding frame 11. The unwinding roller 13 is connected between the two first bearing seats 12. The unwinding motor 14 is connected to the unwinding frame 11, and the output shaft of the unwinding motor 14 is coaxially connected to the roller shaft of the unwinding roller 13.

[0023] The auxiliary component 2 includes a fixing frame 21, a first auxiliary roller 22, a second auxiliary roller 23, a first moving frame 24 and a first lifting cylinder 25. The fixing frame 21 is placed between the heating box 4 and the unwinding frame 11. The fixing frame 21 is arranged in an inverted “U” shape. The first auxiliary roller 22 is connected to the fixing frame 21. The first lifting cylinder 25 is connected to the top of the fixing frame 21. The first moving frame 24 is connected to the end of the piston rod of the first lifting cylinder 25 passing through the fixing frame 21. The second auxiliary roller 23 is connected to the first moving frame 24. The first auxiliary roller 22 and the second auxiliary roller 23 are arranged in parallel. The first auxiliary roller 22 is located below the second auxiliary roller 23.

[0024] The stretching component 3 includes a second lifting cylinder 31, a lifting frame 32 and a stretching roller 33. The second lifting cylinder 31 is connected to the heating box 4. A number of second lifting cylinders 31 are respectively provided on the upper and lower side walls of the heating box 4. The number of second lifting cylinders 31 is arranged along the length direction of the heating box 4. The upper and lower rows of second lifting cylinders 31 are arranged in a staggered manner. The lifting frame 32 is connected to the end of the piston rod of the second lifting cylinder 31 penetrating into the heating box 4. The stretching roller 33 is connected to the lifting frame 32. The stretching roller 33 is arranged in a direction perpendicular to the film running route.

[0025] The heating component 5 includes electric heating rods 51 and heat insulation plates 52. The electric heating rods 51 are connected inside the heating box 4. A number of electric heating rods 51 are respectively provided on the opposite sides of the heating box 4. The electric heating rods 51 are arranged along the width direction of the heating box 4. The heat insulation plates 52 are connected to the inner wall of the heating box 4. During stretching, the electric heating rods 51 are used to increase the temperature inside the heating box 4, and the film is heated to improve its ductility. And the heat insulation plates 52 are used to reduce the loss of temperature inside the heating box 4.

[0026] The cooling component 6 includes a mounting frame 61, a first cooling roller 62, a second cooling roller 63, a second moving frame 64 and a third lifting cylinder 65. The mounting frame 61 is placed on one side close to the discharge port 42 of the heating box 4. The mounting frame 61 is arranged in an inverted “U” shape. The first cooling roller 62 is connected to the mounting frame 61. The third lifting cylinder 65 is connected to the top of the mounting frame 61. The second moving frame 64 is connected to the end of the piston rod of the third lifting cylinder 65 passing through the mounting frame 61. The second cooling roller 63 is connected to the second moving frame 64. The first cooling roller 62 and the second cooling roller 63 are arranged in parallel. The first cooling roller 62 is located below the second cooling roller 63.

[0027] The first cooling roller 62 and the second cooling roller 63 are used to cool down the heated film, which is convenient for subsequent winding of the film.

[0028] The coiling assembly 7 includes a coiling frame 71, a second bearing block 72, a coiling roller 73, a coiling motor 74, a pressing cylinder 75 and a pressing plate 76. The coiling frame 71 is placed on one side of the cooling assembly 6. The coiling frame 71 is arranged in an inverted "U" shape. The second bearing block 72 is connected to the coiling frame 71, and one second bearing block 72 is provided on each of the opposite sides of the coiling frame 71. The coiling roller 73 is connected between the two second bearing blocks 72. The coiling motor 74 is connected to the coiling frame 71, and the output shaft of the coiling motor 74 is coaxially connected to the roller shaft of the coiling roller 73. The pressing cylinder 75 is connected to the top of the coiling frame 71, and the pressing plate 76 is connected to the end of the piston rod of the pressing cylinder 75 passing through the coiling frame 71. The pressing plate 76 is arranged along the direction parallel to the axis of the coiling roller 73.

[0029] The implementation principle of a PET film biaxial stretching device in an embodiment of the present application is as follows: During operation, the film on the unwinding roller 13 is sequentially passed between the first auxiliary roller 22 and the second auxiliary roller 23, between the stretching rollers 33 in the heating box 4, and between the first cooling roller 62 and the second cooling roller 63, and then fixed on the coiling roller 73. Then, the first lifting cylinder 25 is used to push the second auxiliary roller 23 to press down the film, the second lifting cylinder 31 is used to push the stretching rollers 33 to tighten the film, the third lifting cylinder 65 is used to push the second cooling roller 63 to press down the film, and at the same time, the temperature in the heating box 4 is increased by using the heating rod. Then, the unwinding motor 14 is used to drive the unwinding roller 13 to rotate and cooperate with the coiling motor 74 to drive the coiling roller 73 to rotate so that the film moves from left to right for stretching and coiling. When the stretching of the film on the unwinding roller 13 is nearly finished, the pressing cylinder 75 is used to push the pressing plate 76 to slightly press the film on the coiling roller 73 so that the remaining film can be tightened.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A PET film biaxial stretching device, characterized in that: It includes an unwinding component (1), a winding component (7), an auxiliary component (2), a heating box (4), a cooling component (6) and a stretching component (3). The unwinding component (1), the auxiliary component (2), the heating box (4), the cooling component (6) and the winding component (7) are arranged in sequence from right to left. Feed ports (41) and discharge ports (42) for film input and output are respectively opened at both ends of the heating box (4). The stretching component (3) is arranged inside the heating box (4). A heating component (5) for heating the film is also provided inside the heating box (4). The cooling component (6) is used to reduce the temperature of the stretched film.

2. A PET film biaxial stretching device according to claim 1, characterized in that: The unwinding component (1) includes an unwinding rack (11), a first bearing seat (12), an unwinding roller (13) and an unwinding motor (14). The unwinding rack (11) is placed on one side close to the feed port (41) of the heating box (4). The unwinding rack (11) is arranged in an inverted "U" shape. The first bearing seat (12) is connected to the unwinding rack (11). One first bearing seat (12) is provided on each of the opposite sides of the unwinding rack (11). The unwinding roller (13) is connected between the two first bearing seats (12). The unwinding motor (14) is connected to the unwinding rack (11). The output shaft of the unwinding motor (14) is coaxially connected to the roller shaft of the unwinding roller (13).

3. A PET film biaxial stretching device according to claim 1, characterized in that: The auxiliary component (2) includes a fixing rack (21), a first auxiliary roller (22), a second auxiliary roller (23), a first moving rack (24) and a first lifting cylinder (25). The fixing rack (21) is placed between the heating box (4) and the unwinding rack (11). The fixing rack (21) is arranged in an inverted "U" shape. The first auxiliary roller (22) is connected to the fixing rack (21). The first lifting cylinder (25) is connected to the top of the fixing rack (21). The first moving rack (24) is connected to the end of the piston rod of the first lifting cylinder (25) passing through the fixing rack (21). The second auxiliary roller (23) is connected to the first moving rack (24). The first auxiliary roller (22) and the second auxiliary roller (23) are arranged parallel to each other. The first auxiliary roller (22) is located below the second auxiliary roller (23).

4. A PET film biaxial stretching device according to claim 1, characterized in that: The stretching component (3) includes a second lifting cylinder (31), a lifting rack (32) and a stretching roller (33). The second lifting cylinder (31) is connected to the heating box (4). A number of second lifting cylinders (31) are respectively provided on the upper and lower side walls of the heating box (4). The number of the second lifting cylinders (31) is arranged along the length direction of the heating box (4). The upper and lower rows of the second lifting cylinders (31) are arranged in a staggered manner. The lifting rack (32) is connected to the end of the piston rod of the second lifting cylinder (31) penetrating into the heating box (4). The stretching roller (33) is connected to the lifting rack (32). The stretching roller (33) is arranged in a direction perpendicular to the film running route.

5. A PET film biaxial stretching device according to claim 1, characterized in that: The heating assembly (5) includes a heating rod (51) and a heat preservation plate (52). The heating rod (51) is connected inside the heating box (4). A plurality of heating rods (51) are respectively provided on two opposite sides of the heating box (4). The heating rods (51) are arranged along the width direction of the heating box (4). The heat preservation plate (52) is connected to the inner wall of the heating box (4).

6. A PET film biaxial stretching device according to claim 1, characterized in that: The cooling assembly (6) includes a mounting frame (61), a first cooling roller (62), a second cooling roller (63), a second moving frame (64) and a third lifting cylinder (65). The mounting frame (61) is placed on one side close to the discharge port (42) of the heating box (4). The mounting frame (61) is arranged in an inverted "U" shape. The first cooling roller (62) is connected to the mounting frame (61). The third lifting cylinder (65) is connected to the top of the mounting frame (61). The second moving frame (64) is connected to the end of the piston rod of the third lifting cylinder (65) passing through the mounting frame (61). The second cooling roller (63) is connected to the second moving frame (64). The first cooling roller (62) and the second cooling roller (63) are arranged parallel to each other. The first cooling roller (62) is located below the second cooling roller (63).

7. A PET film biaxial stretching device according to claim 1, characterized in that: The winding assembly (7) includes a winding frame (71), a second bearing seat (72), a winding roller (73), a winding motor (74), a pressing cylinder (75) and a pressing plate (76). The winding frame (71) is placed on one side of the cooling assembly (6). The winding frame (71) is arranged in an inverted "U" shape. The second bearing seat (72) is connected to the winding frame (71). One second bearing seat (72) is respectively provided on two opposite sides of the winding frame (71). The winding roller (73) is connected between the two second bearing seats (72). The winding motor (74) is connected to the winding frame (71). The output shaft of the winding motor (74) is coaxially connected to the roller shaft of the winding roller (73). The pressing cylinder (75) is connected to the top of the winding frame (71). The pressing plate (76) is connected to the end of the piston rod of the pressing cylinder (75) passing through the winding frame (71). The pressing plate (76) is arranged along the direction parallel to the axis of the winding roller (73).

Images