CN109250548B - Method for rolling PVA film for polaroid - Google Patents
Method for rolling PVA film for polaroid Download PDFInfo
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- CN109250548B CN109250548B CN201811008325.9A CN201811008325A CN109250548B CN 109250548 B CN109250548 B CN 109250548B CN 201811008325 A CN201811008325 A CN 201811008325A CN 109250548 B CN109250548 B CN 109250548B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
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Abstract
The invention provides a method for rolling a PVA film for a polaroid, which comprises the steps of rolling the PVA film to be rolled by a rolling press roller through a rolling mechanism; in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move to the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding compression roller is unchanged. According to the winding method provided by the invention, the winding mechanism is controlled to move transversely, so that the repeated stacking of the PVA film on the film site due to the thickness difference is effectively avoided, the accumulation of the thickness difference is weakened to a certain extent, the winding mechanism is controlled to be wholly pushed towards the winding direction, the film on the winding roller mechanism and the winding press roller are always in relatively stable positions, and the stable winding of the film is realized. Experimental results show that the PVA film is flat in surface and free of defects such as wrinkles, stripes, creases and the like in the whole winding process by using the winding method provided by the invention.
Description
Technical Field
The invention relates to the technical field of PVA films, in particular to a method for rolling a PVA film for a polarizer.
Background
Polarizers are important components of Liquid Crystal Displays (LCDs) and are mainly used to control the optical rotation of light passing through the liquid crystal. The polarizer is generally a polarizing film formed by oriented adsorption of iodine or dichroic dye of a dichroic dye to a polyvinyl alcohol resin film. With the increase in width and the thinning of LCD products, the polarizer is also developing in the direction of larger size and thinner thickness.
However, as the width of the PVA film increases and the thickness thereof becomes thinner, a number of problems may occur in the winding process: on one hand, the PVA film is difficult to ensure the absolute uniformity of thickness (the thickness difference of the current product is controlled within +/-1 mu m) in the coating process, especially the transverse thickness of the film, in the winding process, the transverse thickness difference of the film is aggravated along with the increase of the coating layer number of the film, so that the thickness difference is accumulated, and finally, the gradually enlarged thickness difference easily causes the defects of stripes, tracks, wrinkles and the like in the winding of the film, so that the quality problem of the product is caused. On the other hand, since the PVA films are flexible and easily adhered to each other, wrinkles are very easily generated in conventional winding. Moreover, the above phenomenon is more obvious in the winding of a thin and wide PVA film.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for winding a PVA film for a polarizer, which can effectively reduce the defects of stripes, tracks, wrinkles, etc. caused by winding the PVA film, and is suitable for manufacturing a thin PVA film with a large width.
The invention provides a method for rolling a PVA film for a polaroid, which comprises the steps of rolling the PVA film to be rolled by a rolling press roller through a rolling mechanism; in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move to the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding compression roller is unchanged.
Preferably, the width of the PVA film to be rolled is 800 mm-5000 mm, the thickness is 20 μm-100 μm, and the thickness uniformity is within +/-2 μm.
Preferably, the winding compression roller is a flattening roller; the diameter of the winding compression roller is 50 mm-500 mm.
Preferably, the rolling speed is 0.3-10 m/min, the rolling tension is 1-50 N.m, and the rolling length of a single roll of film is 1000-20000 m.
Preferably, the rolling mechanism moves left and right along the central position in the horizontal direction with the amplitude of 1 mm-10 mm.
Preferably, the amplitude of the left and right movement of the winding mechanism along the central position in the horizontal direction is controlled by the thickness tester in a linkage manner.
Preferably, the left and right movement speed of the winding mechanism along the central position in the horizontal direction is 0.1 mm/min-20 mm/min.
Preferably, the rolling mechanism moves towards the rolling direction along with the increase of the thickness of the film roll at the same speed as the radius of the film roll increases.
Preferably, the distance between the surface of the film on the winding mechanism and the surface of the winding press roller is 1 mm-150 mm.
The invention provides a method for rolling a PVA film for a polaroid, which comprises the steps of rolling the PVA film to be rolled by a rolling press roller through a rolling mechanism; in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move to the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding compression roller is unchanged. Compared with the prior art, the winding method provided by the invention has the advantages that the winding mechanism is controlled to move transversely, so that the repeated stacking of the PVA film on the film site due to the thickness difference is effectively avoided, the accumulation of the thickness difference is weakened to a certain extent, the winding mechanism is controlled to be wholly pushed towards the winding direction, the film on the winding roller mechanism and the winding press roller are always in relatively stable positions, and the stable winding of the film is realized. Experimental results show that the PVA film is flat in surface and free of defects such as wrinkles, stripes, creases and the like in the whole winding process by using the winding method provided by the invention.
In addition, the rolling method provided by the invention is suitable for thin and wide PVA films, and the PVA films obtained by rolling can be stable and uniform without defect, have more excellent appearance, and are further suitable for manufacturing large-area liquid crystal displays.
Drawings
FIG. 1 is a diagram showing the effect of a PVA film obtained by the winding method provided in example 1 of the present invention;
FIG. 2 is a diagram showing the effect of a PVA film obtained by the winding method provided in example 2 of the present invention;
FIG. 3 is a diagram showing the effect of a PVA film obtained by the winding method provided in example 3 of the present invention;
FIG. 4 is a diagram showing the effect of the PVA film obtained by the winding method according to comparative example 1;
FIG. 5 is a diagram showing the effect of the PVA film obtained by the winding method of comparative example 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for rolling a PVA film for a polaroid, which comprises the steps of rolling the PVA film to be rolled by a rolling press roller through a rolling mechanism; in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move to the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding compression roller is unchanged.
According to the invention, a PVA film to be rolled is rolled through a rolling mechanism after passing through a rolling compression roller; the invention has no special limitation on the winding device, adopts PVA coating equipment well known by technicians in the field, comprises a winding mechanism capable of realizing the winding function and a necessary winding compression roller arranged in front of the winding mechanism, and has no special limitation on the invention.
In the invention, the width of the PVA film to be rolled is preferably 800 mm-5000 mm, and more preferably 2800 mm; the thickness of the PVA film to be rolled is preferably 20-100 μm, and more preferably 50-70 μm; the thickness uniformity of the PVA film to be rolled is preferably within +/-2 μm, and more preferably +/-1 μm.
In the invention, the rolling compression roller is preferably a flattening roller; the flattening roller can ensure the flattening effect of the film before rolling, and the invention has no special limitation to the effect. In the present invention, the roll of the take-up press roll is preferably a metal-coated roll or a rubber-coated roll. In the present invention, the diameter of the take-up roll is preferably 50mm to 500mm, and more preferably 80mm to 300 mm. In the invention, the diameter of the winding compression roller is too small, and winding wrinkles are easily formed.
In the invention, the winding mechanism is preferably a winding roller; the winding mechanism can move in the horizontal direction, and comprises a winding direction perpendicular to the horizontal direction to move transversely (cannot move up and down), and further comprises a winding direction.
In the invention, the rolling speed is preferably 0.3-10 m/min, more preferably 2-5 m/min; the winding tension of the winding is preferably 1 N.m-50 N.m, and more preferably 14 N.m; the rolling length of the rolled single-roll film is preferably 1000 m-20000 m, and more preferably 20000 m. In a preferred embodiment of the invention, the tension jump during winding is less than ± 0.5N · m under the winding tension.
In the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move towards the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding press roller is unchanged.
The invention controls the winding mechanism to move left and right along the central position in the horizontal direction. In the invention, the width of the rolling mechanism moving left and right along the central position in the horizontal direction is preferably 1mm to 10mm, and more preferably 5 mm.
In the invention, the amplitude of the left and right movement of the winding mechanism along the central position in the horizontal direction is controlled by the thickness tester in a linkage manner. According to the invention, the online thickness testing instrument in the film production line is used together with the winding mechanism, so that the purpose of online adjustment and control of the movement of the winding mechanism can be achieved.
In the invention, the speed of the rolling mechanism moving left and right along the central position in the horizontal direction is preferably 0.1 mm/min-20 mm/min, and more preferably 10 mm/min. In the invention, the process that the winding mechanism moves left and right along the central position in the horizontal direction can be continuously carried out or carried out at intervals, so that the film on the winding mechanism is ensured not to be stacked in thickness in the TD (film width) direction.
In the invention, the applicant researches and discovers that the rolling mechanism is controlled to move transversely, so that repeated stacking of the PVA film on the film site due to thickness difference can be effectively avoided, the accumulation of the thickness difference is weakened to a certain extent, and the problem of wrinkling of the PVA film can be effectively reduced.
The invention controls the rolling mechanism to move towards the rolling direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the rolling mechanism and the surface of the rolling press roller is not changed. In the invention, the distance between the surface of the film on the winding mechanism and the surface of the winding press roller is preferably 1 mm-150 mm, and more preferably 5 mm-100 mm.
In the invention, the speed of the rolling mechanism moving to the rolling direction along with the increase of the thickness of the film roll is preferably the same as the speed of the radius increase of the film roll; thereby ensuring that the film on the winding roller mechanism and the winding press roller are always in relatively stable positions.
In the invention, along with the increase of the film winding length, the relative position of the film on the winding mechanism and the winding compression roller before winding is inevitably changed; the applicant researches and discovers that when the rolling mechanism is controlled to integrally move towards the rolling direction along with the increase of the rolling length, the film on the rolling mechanism and the rolling compression roller are always kept in relatively stable positions, and the stable rolling of the film is promoted.
The invention provides a method for rolling a PVA film for a polaroid, which comprises the steps of rolling the PVA film to be rolled by a rolling press roller through a rolling mechanism; in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism moves to the winding direction along with the increase of the thickness of the film roll, so that the distance between the surface of the film on the winding mechanism and the surface of the winding compression roller is unchanged. Compared with the prior art, the winding method provided by the invention has the advantages that the winding mechanism is controlled to move transversely, so that the repeated stacking of the PVA film on the film site due to the thickness difference is effectively avoided, the accumulation of the thickness difference is weakened to a certain extent, the winding mechanism is controlled to be wholly pushed towards the winding direction, the film on the winding roller mechanism and the winding press roller are always in relatively stable positions, and the stable winding of the film is realized. Experimental results show that the PVA film is flat in surface and free of defects such as wrinkles, stripes, creases and the like in the whole winding process by using the winding method provided by the invention.
In addition, the rolling method provided by the invention is suitable for thin and wide PVA films, and the PVA films obtained by rolling can be stable and uniform without defect, have more excellent appearance, and are further suitable for manufacturing large-area liquid crystal displays.
To further illustrate the present invention, the following examples are provided for illustration. The equipment used in the following embodiments of the present invention is PVA coating equipment, which comprises extrusion feeding equipment, a T-shaped die, a mirror surface roller, a drying roller set, an air-floating oven, a roll-out winding mechanism, and the like.
Example 1
Preparing a PVA film with the width of 2800mm, the thickness of 75 microns and the film thickness uniformity of +/-1 micron by a PVA film production line; rolling the PVA film by a rolling mechanism after passing through a rolling compression roller with the diameter of 250 mm; in the winding process, the winding mechanism is controlled to transversely move (to be deviated from the center position left and right) within the range of 5mm, the transverse moving speed is 10mm/min, and the winding stability is ensured; meanwhile, the winding speed is 5m/min, the winding tension is 14 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 5 mm; and the total length of the film is 20000m, so that the PVA film is wound.
In the whole rolling process, the surface of the PVA film is flat, and the defects of cockles, stripes, creases and the like are avoided, and the method is shown in figure 1.
Example 2
Preparing a PVA film with the width of 800mm, the thickness of 20 mu m and the film thickness uniformity of +/-1 mu m by a PVA film production line; rolling the PVA film by a rolling mechanism after passing through a rolling compression roller with the diameter of 50 mm; in the winding process, the winding mechanism is controlled to transversely move (to be offset from the center position left and right) within the range of 5mm, the transverse moving speed is 0.1mm/min, and the winding stability is ensured; meanwhile, the winding speed is 2m/min, the winding tension is 50 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 50 mm; and the total length of the film is 20000m, so that the PVA film is wound.
In the whole rolling process, the surface of the PVA film is flat, and the defects of cockles, stripes, creases and the like are avoided, and the method is shown in figure 2.
Example 3
Preparing a PVA film with the width of 5000mm, the thickness of 100 mu m and the film thickness uniformity of +/-2 mu m by a PVA film production line; rolling the PVA film by a rolling mechanism after passing through a rolling compression roller with the diameter of 500 mm; in the winding process, the winding mechanism is controlled to transversely move (to be deviated from the center position left and right) within a range of 10mm, the transverse moving speed is 20mm/min, and the winding stability is ensured; meanwhile, the winding speed is 10m/min, the winding tension is 1 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 1 mm; and the total length of the film is 20000m, so that the PVA film is wound.
In the whole rolling process, the surface of the PVA film is flat, and the defects of cockles, stripes, creases and the like are avoided, and the method is shown in figure 3.
Comparative example 1
Preparing a PVA film with the width of 2800mm, the thickness of 75 microns and the film thickness uniformity of +/-1 micron by a PVA film production line; rolling the PVA film by a rolling mechanism after passing through a rolling compression roller with the diameter of 250 mm; in the winding process, the winding mechanism is controlled to be fixed and not to shift left and right, and winding is carried out; meanwhile, the winding speed is 5m/min, the winding tension is 14 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 5 mm; and the total length of the film is 20000m, so that the PVA film is wound.
The whole rolling process, PVA film rolling stability in earlier stage, nevertheless along with the increase of rolling up core thickness, the film thickness difference on rolling up the core shows gradually, finally leads to the film of rolling up in-core to appear defects such as pincher trees, see FIG. 4 and show.
Comparative example 2
Preparing a PVA film with the width of 2800mm, the thickness of 75 microns and the film thickness uniformity of +/-1 micron by a PVA film production line; directly winding the PVA film through a winding mechanism (no winding press roller is arranged in front of a winding roller); in the winding process, the winding mechanism is controlled to transversely move (to be deviated from the center position left and right) within the range of 5mm, the transverse moving speed is 10mm/min, and the winding stability is ensured; meanwhile, the winding speed is 5m/min, and the winding tension is 14 N.m; the film directly enters a roll core for rolling, and the total length of the rolled film is 20000m, so that the rolling of the PVA film is completed.
The whole winding process is unstable, and stripe wrinkles are easily generated and introduced into the film roll, so that the performance of the product is damaged, as shown in fig. 5.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A method for rolling a PVA film for a polaroid comprises the steps of rolling the PVA film to be rolled by a rolling press roller and then by a rolling mechanism; the device is characterized in that in the winding process, the winding mechanism is controlled to move left and right along the central position in the horizontal direction, and the winding mechanism is controlled to move towards the winding direction along with the increase of the thickness of a film roll, so that the distance between the surface of the film on the winding mechanism and the surface of a winding compression roller is unchanged; the winding compression roller is a flattening roller; the amplitude of the rolling mechanism moving left and right along the central position in the horizontal direction is controlled by the thickness tester in a linkage manner;
when the width of the PVA film is 2800mm, the thickness of the PVA film is 75 microns, and the uniformity of the thickness of the PVA film is +/-1 micron, winding the PVA film by a winding mechanism after passing through a winding press roller with the diameter of 250 mm; in the winding process, the winding mechanism is controlled to transversely move within a range of 5mm, the transverse moving speed is 10mm/min, and the winding stability is ensured; meanwhile, the winding speed is 5m/min, the winding tension is 14 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 5 mm; the total length of the film is 20000m, and the winding of the PVA film is completed;
when the width of the PVA film is 800mm, the thickness of the PVA film is 20 mu m, and the uniformity of the thickness of the PVA film is +/-1 mu m, winding the PVA film by a winding mechanism after passing through a winding compression roller with the diameter of 50 mm; in the winding process, the winding mechanism is controlled to transversely move within the range of 5mm, the transverse moving speed is 0.1mm/min, and the winding stability is ensured; meanwhile, the winding speed is 2m/min, the winding tension is 50 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 50 mm; the total length of the film is 20000m, and the winding of the PVA film is completed;
when the width of the PVA film is 5000mm, the thickness of the PVA film is 100 mu m, and the uniformity of the thickness of the PVA film is +/-2 mu m, winding the PVA film by a winding mechanism after passing through a winding compression roller with the diameter of 500 mm; in the winding process, the winding mechanism is controlled to transversely move within a range of 10mm, the transverse moving speed is 20mm/min, and the winding stability is ensured; meanwhile, the winding speed is 10m/min, the winding tension is 1 N.m, and the winding mechanism moves backwards along with the film winding, so that the distance between the surface of the film on the winding roller and the surface of the winding compression roller is always kept at 1 mm; and the total length of the film is 20000m, so that the PVA film is wound.
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| CN112794165A (en) * | 2021-01-19 | 2021-05-14 | 江苏厚生新能源科技有限公司 | Method for reducing rolling deformation of main line base film |
| CN112777376A (en) * | 2021-01-19 | 2021-05-11 | 江苏厚生新能源科技有限公司 | Method for reducing rolling deformation of base film main line |
| CN112777375A (en) * | 2021-01-19 | 2021-05-11 | 江苏厚生新能源科技有限公司 | Secondary slitting method for reducing rolling wavy edges |
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| CN201287982Y (en) * | 2008-10-24 | 2009-08-12 | 汕头市远东轻化装备有限公司 | Film rolling apparatus |
| CN202369170U (en) * | 2011-12-21 | 2012-08-08 | 天津市中天宏大纸业有限公司 | Automatic winding tracking device for hot melt adhesive coating machine |
| CN202807960U (en) * | 2012-06-13 | 2013-03-20 | 湖州新利商标制带有限公司 | Rolling-up machine for coated label cloth |
| CN104003233B (en) * | 2014-06-11 | 2016-11-02 | 永新股份（黄山）包装有限公司 | A kind of thin film film roll thickness product tires out control system |
| CN204528822U (en) * | 2015-02-07 | 2015-08-05 | 宿迁市金田塑业有限公司 | Prevent BOPP film from running the wrap-up on limit |
| CN205061062U (en) * | 2015-10-27 | 2016-03-02 | 苏州金韦尔机械有限公司 | Stone paper rolling machine |
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| CN105947761A (en) * | 2016-07-01 | 2016-09-21 | 无锡先导智能装备股份有限公司 | Tracking device for collecting and winding |
| CN206857827U (en) * | 2017-06-06 | 2018-01-09 | 湖北恒泰橡塑有限公司 | The gap adjustment wrap-up of film for transfusion |
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