A cellulose film processing device and method

Abstract

The present invention discloses a cellulose film processing device and method, the processing device comprising: a conveying device 22, a first supporting metal roller 26, a second supporting metal roller 27, a first trimming device 1, a second trimming device 101, a drying device 29, and a winding device 30. The cellulose film prepared by the present invention has no scratches and no dust on the surface, and avoids problems such as warping of the film edge and uneven thickness caused by inconsistent drying rates between the edge and the middle of the cast film.

Description

Technical Field

[0001] The present invention relates to the field of film production technology, with classification number B26D9 / 00, and specifically to a processing device and method for a cellulose film. Background Art

[0002] TAC film is typically produced using a solution casting method. This involves using partially hydrolyzed cellulose triacetate as the raw material, dissolving it in an organic solvent to create a colloid solution. This colloid solution is then cast onto a continuously rotating support to form a gel-like TAC film of uniform thickness. This film is then peeled, dried, trimmed, embossed, and wound to form a roll-formed TAC film. Compared to other methods such as melt casting and melt extrusion, TAC films produced using the solution casting method exhibit superior optical isotropy and possess excellent optical and physical and chemical properties, making them particularly suitable for optical display applications.

[0003] However, the current solution casting method for preparing TAC films has the following problems: since the drying rate at the edge of the film is inconsistent with the drying rate in the middle, it is easy to cause problems such as warping of the edge of the film and uneven thickness, making it impossible to carry out subsequent processes. In addition, in the existing technology, the light film trimming technology used in the solution casting method mainly adopts the form of a stacked knife shearing structure, which is easy to cause burrs on the edge of the film and easily generate dust. Summary of the Invention

[0004] In view of the above problems existing in the prior art, a cellulose film processing device is provided. The specific technical solution is as follows: A cellulose film processing device includes a conveying device, a first supporting metal roller, a second supporting metal roller, a first trimming device, a second trimming device, a drying device, and a winding device;

[0005] One end of the conveying device is a storage container, the conveying device and the storage container are connected by a pipeline, and the die head is located above the second supporting metal roller, and the die head is connected to the pipeline;

[0006] The second supporting metal roller and the first supporting metal roller are connected by an annular belt-shaped support body, and the annular belt-shaped support body is below the die head;

[0007] The second supporting metal roller, the peeling roller, and the first trimming device are connected through an annular belt support body. One side of the first trimming device is a drying device. The first edge of the film after slitting is connected to the first negative pressure platform. The first negative pressure generating device is connected to the second trimming device through an annular belt support body. One side of the drying device is the second trimming device, and one side of the second trimming device is a winding device.

[0008] Preferably, the first trimming device includes a first guide roller, a second guide roller, a first negative pressure platform, a first trimming knife, a first driving device, a first negative pressure generating device and a second trimming knife.

[0009] Further preferably, the first negative pressure generating device is connected to the second trimming device via an annular belt-shaped support body.

[0010] Further preferably, the first negative pressure platform has an elongated slot, and both sides of the elongated slot have holes. The number of the holes is not limited and depends on actual needs.

[0011] Further preferably, the first trimming knife is embedded in the first negative pressure platform, and the embedding depth thereof is 0.05-0.1 times of the outer diameter of the trimming knife.

[0012] Further preferably, the first trimming knife is embedded in the elongated slot in the first negative pressure platform, and the embedding depth is 0.05-0.08 times the outer diameter of the first trimming knife.

[0013] Further preferably, the first trimming knife is embedded in the elongated slot in the first negative pressure platform, and the embedding depth is 0.08 times the outer diameter of the first trimming knife.

[0014] Further preferably, the outer contour of the first trimming knife is tightly connected to the output shaft of the first driving device. When the first driving device is running, the first trimming knife starts to rotate, and its rotation direction is perpendicular to the running direction of the cast film and parallel to the plane of the first negative pressure platform.

[0015] Further preferably, the first negative pressure generating device is a vortex fan or a centrifugal fan.

[0016] Preferably, the axes of the first guide roller and the second guide roller are in the same plane, the closest distance between the outer contours of the first guide roller and the second guide roller is D, and D is 0.5-1 times the outer diameter of the trimming knife.

[0017] Further preferably, the D is 0.5-0.8 times the outer diameter of the trimming knife.

[0018] Further preferably, D is 0.5 times the outer diameter of the trimming knife.

[0019] Preferably, the straight-line distance between the first trimming knife and the second trimming knife is A, which is the required trimming width of the film.

[0020] Preferably, the parallel distance between the first negative pressure platform and the first guide roller is 1-5 mm.

[0021] Further preferably, the parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0022] Preferably, the first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotation axis of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure. The tip angle of the first trimming knife is set to a, and a is 0.5-5°.

[0023] More preferably, the angle a is 1-1.5°.

[0024] More preferably, the angle a is 1.5°.

[0025] Further preferably, the first driving device includes but is not limited to a variable frequency motor, a servo motor and a pneumatic drive motor.

[0026] Preferably, the thickness b of the first trimming knife is 0.3-5 mm, and the first trimming knife is a double-sided blade structure.

[0027] Further preferably, the thickness b of the first trimming knife is 0.3-1 mm.

[0028] Further preferably, the thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0029] Preferably, the outer diameter linear speed of the first trimming knife is 0.5-5 times the running speed of the cellulose film.

[0030] Further preferably, the outer diameter linear speed of the first trimming blade is 1-1.5 times the running speed of the film.

[0031] Further preferably, the outer diameter linear speed of the first trimming blade is 1.5 times the running speed of the film.

[0032] A second aspect of the present invention provides a method for processing a cellulose film, the method comprising the following steps:

[0033] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0034] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0035] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0036] Preferably, the cast film in step S2 needs to be peeled off and then pre-trimmed.

[0037] The above technical solution has the following advantages or beneficial effects:

[0038] (1) The present invention adopts a processing method of first peeling the cast film and then pre-cutting the edges, so that the thickness of the drying area of ​​the cast film is uniform and the edges are neat, avoiding the problems of film edge warping and uneven thickness caused by the inconsistent drying rates between the edge and the middle of the cast film.

[0039] (2) The cutting blade of the present invention adopts a double-sided blade structure, which avoids the edge of the cast film after slitting from contacting the blade again, thereby making the cut edge neat. The multiple cutting edges are used to avoid scratches on the cellulose film.

[0040] (3) The first negative pressure platform in the present invention has an elongated slot, and holes are provided on both sides of the elongated slot. During operation, dust generated by cutting can escape from the holes, so that the surface of the cellulose membrane is dust-free.

[0041] (4) The present invention optimizes the closest distance between the edges of the first guide roller and the second guide roller, the angle of the first trimming knife, the outer diameter linear speed and the outer diameter, which not only improves the flatness and burr-freeness of the edge of the cellulose film, but also makes the surface free of dust and scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0043] Figure 1 A cellulose film processing device proposed by the present invention;

[0044] Figure 2 This is a schematic structural diagram of the first trimming device proposed in the present invention.

[0045] Figure 3 This is a schematic diagram of the principle of the first trimming device proposed in the present invention;

[0046] Figure 4 This is a schematic structural diagram of the first trimming knife proposed in the present invention. Figure 4 It includes a the angle of the first trimming knife and b the thickness of the first trimming knife.

[0047] Figure 5 This is a schematic structural diagram of the first negative pressure platform proposed in the present invention.

[0048] The above-mentioned figure marks represent: first trimming device 1, second trimming device 101, first trimming knife 11, second trimming knife 111, first guide roller 13, second guide roller 14, first driving device 15, second driving device 151, first negative pressure platform 16, second negative pressure platform 161, hole 18, elongated slot 19, film 20, storage container 21, conveying device 22, pipeline 23, die head 24, annular belt support body 25, first supporting metal roller 26, second supporting metal roller 27, peeling roller 28, drying device 29, winding device 30, first negative pressure generating device 31, first edge 32 of the film after slitting, second edge 321 of the film after slitting. DETAILED DESCRIPTION

[0049] Example 1

[0050] like Figures 1 to 5 As shown, a cellulose film processing device proposed in this embodiment includes a conveying device 22, a first supporting metal roller 26, a second supporting metal roller 27, a first trimming device 1, a second trimming device 101, a drying device 29, and a winding device 30. One end of the conveying device 22 is a storage container 21, and the conveying device 22 and the storage container 21 are connected by a pipe 23. Above the second supporting metal roller 27 is a die head 24, and the die head 24 is connected to the pipe 23.

[0051] The second supporting metal roller 27 and the first supporting metal roller 26 are connected by an annular belt-shaped support body 25, and the annular belt-shaped support body 25 is below the die head 24;

[0052] The second supporting metal roller 27, the peeling roller 28, and the first trimming device 1 are connected by an annular belt support body 25. One side of the first trimming device 1 is a drying device 29. The first edge 32 of the film after slitting is connected to the first negative pressure platform 16. One side of the drying device 29 is the second trimming device 101, and one side of the second trimming device 101 is the winding device 30.

[0053] The first trimming device 1 is embedded in the elongated slot 19 in the first negative pressure platform 16 , and the embedding depth is 0.08 times the outer diameter of the trimming knife.

[0054] The outer contour of the first trimming knife 11 is tightly connected to the output shaft of the first driving device 15 . When the first driving device 15 is running, the first trimming knife 11 starts to rotate, and its rotation direction is perpendicular to the running direction of the cast film and parallel to the plane of the first negative pressure platform 16 .

[0055] The first negative pressure generating device 31 is a vortex blower.

[0056] The first negative pressure generating device 31 is connected to the second trimming device 101 via an annular belt-shaped support body 25 .

[0057] The first negative pressure platform 16 has an elongated slot 19 , and both sides of the elongated slot have eight holes 18 .

[0058] The straight-line distance between the first trimming knife 11 and the second trimming knife 111 is A, which is the required trimming width of the film.

[0059] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0060] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0061] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0062] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0063] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 1 times the outer diameter of the trimming knife, that is, 100 mm.

[0064] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0065] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 1.5°.

[0066] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0067] The first trimming knife has a double-sided blade structure.

[0068] The outer diameter linear speed of the first trimming blade is 1.5 times the running speed of the cellulose film.

[0069] Example 2

[0070] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0071] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0072] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0073] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0074] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 0.5 times the outer diameter of the trimming knife, that is, 50 mm.

[0075] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0076] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 1.5°.

[0077] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0078] The first trimming knife has a double-sided blade structure.

[0079] The outer diameter linear speed of the first trimming blade is 1.5 times the running speed of the cellulose film.

[0080] The rest is the same as Example 1.

[0081] Example 3

[0082] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0083] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0084] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0085] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0086] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 0.5 times the outer diameter of the trimming knife, that is, 50 mm.

[0087] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0088] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 5°.

[0089] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0090] The first trimming knife has a double-sided blade structure.

[0091] The outer diameter linear speed of the first trimming blade is 1.5 times the running speed of the cellulose film.

[0092] The rest is the same as Example 1.

[0093] Example 4

[0094] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0095] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0096] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0097] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0098] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 0.5 times the outer diameter of the trimming knife, that is, 50 mm.

[0099] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0100] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 0.5°.

[0101] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0102] The first trimming knife has a double-sided blade structure.

[0103] The outer diameter linear speed of the first trimming blade is 1.5 times the running speed of the cellulose film.

[0104] The rest is the same as Example 1.

[0105] Example 5

[0106] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0107] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0108] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0109] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0110] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 0.5 times the outer diameter of the trimming knife, that is, 50 mm.

[0111] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0112] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 1.5°.

[0113] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0114] The first trimming knife has a double-sided blade structure.

[0115] The outer diameter linear speed of the first trimming blade is 0.5 times the running speed of the cellulose film.

[0116] The rest is the same as Example 1.

[0117] Example 6

[0118] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0119] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0120] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0121] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0122] The axes of the first guide roller and the second guide roller are in the same plane, and the closest distance between the edges of the first guide roller and the second guide roller is D, which is 0.5 times the outer diameter of the trimming knife, that is, 50 mm.

[0123] The parallel distance between the first negative pressure platform and the first guide roller is 2.5 mm.

[0124] The first cutting knife device consists of a first trimming knife and a first driving device. The first trimming knife is a circular structure with a pointed top. The top of the first trimming knife takes the axis of the rotating shaft of the first trimming knife as the baseline. The first trimming knife is a symmetrical structure and its angle is set to a, which is 1.5°.

[0125] The thickness b of the first trimming knife is 0.5 mm, and the outer diameter is 100 mm.

[0126] The first trimming knife has a double-sided blade structure.

[0127] The outer diameter linear speed of the first trimming blade is 1 times the running speed of the cellulose film.

[0128] The rest is the same as Example 1.

[0129] Example 7

[0130] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0131] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0132] S2. Pre-cutting: The cast film is driven by the first supporting metal roller and the second supporting metal roller to reach the peeling roller for peeling. After peeling, it is guided to the drying device by the first guide roller and the second guide roller to obtain a semi-finished product.

[0133] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0134] The rest is the same as Example 2.

[0135] Example 8

[0136] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0137] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0138] S2. Pre-cutting: The cast film is driven by the first supporting metal roller and the second supporting metal roller to reach the peeling roller for peeling. After peeling, the cast film is directly introduced into the drying device to obtain a semi-finished product.

[0139] S3. Final trimming: The semi-finished product is run through the second trimming device for final trimming and rolled into a product.

[0140] The rest is the same as Example 2.

[0141] Example 9

[0142] This embodiment also provides a method for processing a cellulose film, and the specific steps are as follows:

[0143] S1. Film Laying: The cellulose solution in the storage container is transported from a conveying device to a die head through a pipeline. The die head discharges the cellulose solution onto an annular belt support. At this time, the annular belt support is in operation to form a cast film.

[0144] S2. Pre-trimming: Driven by the first supporting metal roller and the second supporting metal roller, the cast film reaches the peeling roller for peeling. After peeling, it is guided to the first trimming device by the first guide roller and the second guide roller. After pre-trimming by the first trimming device, the cast film enters the drying device to obtain a semi-finished product.

[0145] S3. Final trimming: The semi-finished product is directly rolled into a finished product.

[0146] Performance Testing

[0147] The evaluation method involves visually observing and evaluating a film product with a length of 2000mm in the casting direction and a width of 1200mm using the light reflection method. The main evaluation criteria are the number of apparent scratches, the degree of unevenness caused by apparent dust, the apparent dust content, and the neatness of the cut edges.

[0148] The evaluation results are shown in Table 1.

[0149] The products of Examples 1-6 and Comparative Examples 1-3 were tested and evaluated according to the following criteria:

[0150] A: No scratches; no unevenness such as pits; no dust on the surface; neat edges without burrs.

[0151] B: Minor scratches, less than 5 in number; less than 3 uneven pits; trace dust on the surface; neat edges with local burrs.

[0152] C: There are obvious scratches, more than 5 in number; there are more than 3 uneven pits; there is a lot of dust attached to the surface; the edges are uneven and jagged.

[0153] D: The product is warped and wrinkled during the process and cannot be rolled up.

[0154] Table 1

[0155]

Claims

1. A cellulose film processing device, characterized in that: The invention comprises a conveying device (22), a first supporting metal roller (26), a second supporting metal roller (27), a first trimming device (1), a second trimming device (101), a drying device (29), and a winding device (30); one end of the conveying device (22) is a storage container (21), the conveying device (22) and the storage container (21) are connected via a pipe (23), the upper portion of the second supporting metal roller (27) is a die head (24), the die head (24) is connected to the pipe (23); the second supporting metal roller (27) and the first supporting metal roller ( 26) are connected through an annular belt-shaped support body (25), and the annular belt-shaped support body (25) is below the die head (24); the second supporting metal roller (27), the peeling roller (28), and the first trimming device (1) are connected through the annular belt-shaped support body (25), one side of the first trimming device (1) is a drying device (29), the first edge (32) of the film after slitting is connected to the first negative pressure platform (16), one side of the drying device (29) is a second trimming device (101), and one side of the second trimming device (101) is a winding device (30); The first trimming device (1) comprises a first guide roller (13), a second guide roller (14), a first negative pressure platform (16), a first trimming knife (11), a first driving device (15), a first negative pressure generating device (31) and a second trimming knife (111); The axes of the first guide roller (13) and the second guide roller (14) are located on the same plane, and the closest distance between the outer contours of the first guide roller (13) and the second guide roller (14) is D, and D is 0.5-1 times the outer diameter of the first trimming knife (11); The first trimming knife (11) is a circular structure with a pointed top. The top of the first trimming knife (11) is based on the axis of the rotation axis of the first trimming knife (11). The first trimming knife (11) is a symmetrical structure. The tip angle of the first trimming knife is set to a, and a is 0.5-5°. The first negative pressure platform (16) has an elongated slot (19), and both sides of the elongated slot have eight holes (18); the first trimming device (1) is embedded in the elongated slot (19) in the first negative pressure platform (16).

2. A cellulose film processing device according to claim 1, characterized in that: The straight-line distance between the first trimming knife (11) and the second trimming knife (111) is A, which is the required trimming width of the film.

3. A cellulose film processing device according to claim 2, characterized in that: The parallel distance between the first negative pressure platform (16) and the first guide roller (13) is 1-5 mm.

4. The cellulose film processing device according to claim 1, characterized in that: The thickness b of the first trimming knife (11) is 0.3-5 mm, and the first trimming knife has a double-sided blade structure.

5. The cellulose film processing device according to claim 1, characterized in that: The outer diameter linear speed of the first trimming knife (11) is 0.5-5 times the running speed of the cellulose film.

6. A method for processing a cellulose film according to any one of claims 1 to 5, characterized in that: The processing method comprises the following steps: S1. Film laying: The cellulose solution is passed from a storage container (21) through a conveying device (22) to a die (24), and then sprayed onto an annular belt-shaped support (25) to form a cast film; S2. Pre-cutting: The cast film is pre-cut by the first trimming device (1) and then enters the drying device (29) to produce a semi-finished product; S3. Final trimming: The dried cast film enters the second trimming device (101) for final trimming and is then rolled up to obtain the product.

7. The method for processing a cellulose film according to claim 6, characterized in that: The cast film in step S2 needs to be peeled off and then pre-cut.

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