CN110980381A - Slitting method of PVA (polyvinyl alcohol) optical film for polaroid - Google Patents
Slitting method of PVA (polyvinyl alcohol) optical film for polaroid Download PDFInfo
- Publication number
- CN110980381A CN110980381A CN201911046091.1A CN201911046091A CN110980381A CN 110980381 A CN110980381 A CN 110980381A CN 201911046091 A CN201911046091 A CN 201911046091A CN 110980381 A CN110980381 A CN 110980381A
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- Prior art keywords
- film
- slitting
- optical film
- controlled
- pva
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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
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/02—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with longitudinal slitters or perforators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
- B65H35/08—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with revolving, e.g. cylinder, cutters or perforators
Abstract
The invention belongs to the field of optical film slitting, and particularly discloses a slitting method of a PVA optical film for a polarizer, which is suitable for slitting a PVA optical film with the thickness of more than 15 um; secondly, leading the film into a knife groove roller through an idler roller and a dancing roller, and cutting the film by using a circular knife, wherein the wrap angle of the film is an obtuse angle when the film is cut by the circular knife; and step three, rewinding the film, and eliminating static accumulation generated in the process by using a static eliminating device. The invention greatly reduces the defect of unstable local tension of the film, reduces the phenomenon that the section of the film is uneven or sawteeth appear, ensures the slitting quality of the film and the orientation reliability of the film in downstream application, and improves the optical performance of the film.
Description
Technical Field
The invention relates to the field of cutting of optical films, in particular to a cutting method of a PVA optical film for a polarizer.
Background
The PVA optical film is a core functional material for manufacturing a polarizer, the PVA optical film is dyed with iodine of a dichroic pigment or a dichroic dye, oriented, and upper and lower laminates to manufacture a polarizer having a polarizing effect on light, and the polarizer is a key component of a Liquid Crystal Display (LCD) (the picture display of the LCD is realized by on-off control of light passing through liquid crystals by the polarizer). With the large size and thin weight of LCD products, the PVA optical film used for manufacturing the polarizer and the polarizer thereof are also developing toward larger size and thinner thickness.
However, as the width of the PVA film becomes larger and the thickness thereof becomes thinner, the film is slit to have uneven or jagged cut surface. Further, the problem is more pronounced in the case of slitting a PVA film having a wider width and a thinner thickness.
Disclosure of Invention
The invention aims to provide a method for slitting a PVA optical film for a polarizer, which is used for solving the problem that the section of the film is not flat or jagged when the film is slit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a slitting method of a PVA optical film for a polarizer is suitable for slitting a PVA optical film with the thickness of more than 15um, and comprises the following steps:
the PVA optical film is introduced into the knife groove roller through the conveying roller, the circular knife is used for cutting, and the wrap angle of the film is an obtuse angle when the circular knife is used for cutting.
The principle of the scheme is as follows:
the inventor finds that the stability factor of a stress point when the film is cut has a large influence on the flatness of a plane, the stress point is more stable, and the flatness of the cut plane is higher when the film is cut.
This scheme of adoption can reach following technological effect:
the PVA optical film has extremely high quality requirements, and the PVA optical film is easily influenced by factors such as environment temperature, humidity, airflow and the like, equipment jumping, operation and the like during slitting to cause the quality of the film to be poor, even wrinkles appear due to unstable local tension of the film, or the appearance quality of the film and the orientation effect during application are influenced due to uneven section or saw teeth. The scheme greatly reduces the defect of unstable local tension of the film, reduces the phenomenon that the section of the film is uneven or has sawteeth, ensures the slitting quality of the film and the orientation reliability of the film in downstream application, and improves the optical performance of the film.
Further, the cutting atmosphere is controlled in the whole cutting process. When the inventor initially investigated and analyzed the causes of unevenness such as corrugation, bulge or slack during the unwinding of the PVA film mother roll, it was found that the unevenness of the film was caused by the jumping of the apparatus and the handling process, and the inventor tried various methods to solve the jumping problem of the apparatus and the reduction of the handling problem, and it was very difficult to eliminate these two original factors. Therefore, the inventor continues to investigate and analyze the reason for the film unevenness, and finally finds that another important factor influencing the film unevenness is an environmental factor (slitting atmosphere), and when the environmental factor is different, the film flatness and the slitting quality are changed accordingly.
Further, the slitting atmosphere specifically comprises: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23-27 ℃, and the humidity is controlled at 55-75%. The air flow rate, temperature and humidity in the environment all have important influence on the flatness of the film, and when the factors such as the air flow rate, the temperature and the humidity are controlled within the range values, the flatness of the film is better, and the slitting quality is better.
Further, the slitting atmosphere specifically comprises: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23 ℃, and the humidity is controlled at 60%. This is the preferred air flow rate, temperature and humidity values.
Further, the slitting atmosphere specifically comprises: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 25 ℃, and the humidity is controlled at 60 percent. This is the preferred air flow rate, temperature and humidity values.
Further, the slitting atmosphere specifically comprises: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23 ℃, and the humidity is controlled at 65 percent. This is the preferred air flow rate, temperature and humidity values.
Furthermore, the film passes through the dancing roller before passing through the conveying roller, and the jumping amplitude of the dancing roller is less than or equal to 5 mu m. When the bounce amplitude of the dancing roller is less than or equal to 5 mu m, the flattening effect on the film is the best.
Furthermore, the traction tension of the film is controlled to be constant in the whole slitting process. The film traction tension is controlled to be stable, the condition of tension fluctuation or tension instability is avoided, the stability of the film during slitting can be ensured, and wrinkles caused during rewinding of the film can be avoided.
Further, the film traction tension is controlled by adjusting the speed of a conveying roller and a winding roller and the pressure of a pressing roller, and whether the tension reaches the required range is displayed by a tension meter according to the specific tension value.
Further, the film tension is 100N/m to 200N/m. When the tension of the film reaches 100N/m-200N/m, the film is better in slitting and flattening effect, and the slitting and winding quality can be ensured; when the film tension is less than 100N/m, the film is easy to relax or wrinkle, and the slitting stability is affected; when the film tension is more than 200N/m, the film is easily deformed, and the optical performance of the film is affected.
Drawings
FIG. 1 is a schematic view showing the wrap angle of a film when cut by a circular knife in example 1 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: a knife groove roller 1, a film 2 and a circular knife 3.
Example 1
A slitting method of a PVA optical film is suitable for slitting a PVA optical film with the thickness of below 15um, and comprises the following steps:
step one, automatically adjusting the deviation of the film on the transverse position through an automatic deviation correcting device.
And step two, passing through an idler roller and a dancing roller (the dancing roller has a bounce amplitude less than or equal to 5 microns), then introducing the dancing roller into a knife groove roller through a conveying roller, and cutting by adopting a circular knife, wherein the wrap angle of the film is an obtuse angle when the circular knife is cut.
And step three, rewinding the film, and eliminating static accumulation generated in the process by using a static eliminating device.
And step four, controlling the rewinding tension of the film to be constant by adjusting the speed of the conveying roller and the speed of the winding roller and the pressure of the pressing roller, wherein the tension of the film is 100N/m, and displaying the traction tension of the film by using a tension meter.
In the cutting process, the cutting atmosphere is controlled, and the cutting atmosphere is specifically as follows: the air flow rate is 5m/min, the temperature is 23 ℃, and the humidity is 60%.
The inventor finds that the film has uneven or jagged section when being slit when the PVA optical film with the thickness of more than 15 micrometers is slit, so that the film is broken or has color spots due to uneven stress when being slit, and researches show that one important reason for causing the uneven or jagged section of the film when being slit is that the PVA film mother roll has uneven conditions of corrugation, drum or looseness and the like in the unfolding process, and the slit film is easy to form wrinkles when being rewound, so that the optical performance of the slit film is influenced.
The automatic deviation rectifying function in the first step is to avoid deviation of the film during unreeling, and the film is inevitably partially dragged after the deviation of the film, so that the film is wrinkled, the automatic deviation rectifying function can avoid the wrinkles caused by the deviation of the film, and meanwhile, the flatness of round surfaces at two ends of the film is facilitated when the cut film is rewound, so that the film can be stored and used conveniently.
In the second step, a circular knife 3 is adopted for cutting, the wrap angle of the film 2 is an obtuse angle when the circular knife 3 cuts, and the wrap angle of the film 2 has the following specific meanings: referring to fig. 1, a portion of the film 2 contacting the knife-grooved roll 1 is an arc-shaped segment, a central angle corresponding to the arc-shaped segment is a wrap angle a of the film 2, and the wrap angle of the film 2 is an obtuse angle in this embodiment. The PVA film with the thickness of more than 15 mu m is thicker than the PVA film with the thickness of less than 15 mu m, if a small wrap angle is adopted, the PVA film is easy to slip on a knife groove roller, and the large wrap angle can ensure that the PVA film is not easy to slip when being cut, thereby ensuring the stability of a stress point.
And in the third step, the static electricity of the film can be removed, so that the influence of the static electricity on the flattening of the film can be weakened, the dust adsorbed by the static electricity of the film can be removed, and the quality of the film is improved.
The PVA optical film has extremely high quality requirements, and the PVA optical film is easily influenced by factors such as environment temperature, humidity, airflow and the like, equipment jumping, operation and the like during slitting to cause the quality of the film to be poor, even wrinkles appear due to unstable local tension of the film, or the appearance quality and the orientation effect of the film are influenced due to uneven section or saw teeth. The scheme greatly reduces the defect of unstable local tension of the film, reduces the phenomenon that the section of the film is uneven or has sawteeth, ensures the slitting quality of the film and the orientation reliability of the film in downstream application, and improves the optical performance of the film.
Example 2
This example differs from example 1 in that: the atmosphere of the cutting is different, in this embodiment, the temperature is controlled at 25 ℃, and the humidity is controlled at 60%.
Example 3
This example differs from example 1 in that: the atmosphere of the cutting is different, in this embodiment, the temperature is controlled at 23 ℃, and the humidity is controlled at 65%.
Example 4
This example differs from example 1 in that: the atmosphere of the cutting is different, in this embodiment, the temperature is controlled at 25 ℃, and the humidity is controlled at 75%.
Example 5
This example differs from example 1 in that: the atmosphere of slitting was varied, and the air flow rate in this example was 3 m/min.
Example 6
This example differs from example 1 in that: the film tension was varied, and in this example the film tension was 30N/m.
Example 7
This example differs from example 1 in that: the film tension was varied, and in this example the film tension was 100N/m.
Comparative example 1
This comparative example differs from example 1 in that: the slitting atmosphere was not controlled.
Comparative example 2
This comparative example differs from example 1 in that: the atmosphere of slitting was different, and the air flow rate in this comparative example was 6 m/min.
Comparative example 3
This comparative example differs from example 1 in that: the atmosphere of cutting is different, the temperature is controlled at 22 ℃ and the humidity is controlled at 50% in the comparative example.
Comparative example 4
This comparative example differs from example 1 in that: the atmosphere of cutting is different, in this comparative example, the temperature is controlled at 28 ℃, and the humidity is controlled at 60%.
Comparative example 5
This comparative example differs from example 1 in that: no static electricity eliminating device.
Comparative example 6
This comparative example differs from example 1 in that: without a deviation correcting device.
The examples and comparative examples were compared and the results were as follows: (in the following table, the judgment of the motion state of the film is carried out by observing whether the film is flat, corrugated or loose by naked eyes, the judgment of the section effect is carried out by observing whether the film is flat or sawtoothed by naked eyes, the judgment of the rolling state is carried out by observing whether the film is flat, folded or deformed by naked eyes, the orientation effect is good, cracked or broken by the stretching rate, when the stretching rate is 5.8-6.3 times, the orientation effect is good, when the stretching rate is less than 5.5 times, the orientation effect is poor, and the judgment of the optical performance is carried out by observing whether light spots or not by naked eyes.)
As can be seen from the above table, when the slitting atmosphere is controlled at an air flow rate of less than or equal to 5m/min, the temperature is controlled at 23-27 ℃, the humidity is controlled at 55-75%, and the film tension is controlled at 30-100N/m, the motion state of the film is flat, the corrugated relaxation state is avoided, the section is flat, the film is flat and free of wrinkle deformation during winding, the orientation effect is good, no crack or fracture is caused, and the optical performance is good.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A slitting method of a PVA optical film for a polarizer is characterized by comprising the following steps: the method is suitable for slitting the PVA optical film with the thickness of more than 15um, and comprises the following steps:
the PVA optical film is introduced into the knife groove roller through the conveying roller, the circular knife is used for cutting, and the wrap angle of the film is an obtuse angle when the circular knife is used for cutting.
2. The slitting method of the PVA optical film for the polarizer according to claim 1, wherein: and controlling the cutting atmosphere in the whole cutting process.
3. The slitting method of the PVA optical film for the polarizer according to claim 2, wherein: the slitting atmosphere specifically comprises the following steps: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23-27 ℃, and the humidity is controlled at 55-75%.
4. The slitting method of the PVA optical film for the polarizer according to claim 3, wherein: the slitting atmosphere specifically comprises the following steps: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23 ℃, and the humidity is controlled at 60%.
5. The slitting method of the PVA optical film for the polarizer according to claim 3, wherein: the slitting atmosphere specifically comprises the following steps: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 25 ℃, and the humidity is controlled at 60%.
6. The slitting method of the PVA optical film for the polarizer according to claim 3, wherein: the slitting atmosphere specifically comprises the following steps: the air flow rate is less than or equal to 5m/min, the temperature is controlled at 23 ℃, and the humidity is controlled at 65%.
7. The slitting method of the PVA optical film for the polarizer according to claim 1, wherein: the film passes through the dancing roller before passing through the conveying roller, and the jumping amplitude of the dancing roller is less than or equal to 5 mu m.
8. The slitting method of the PVA optical film for the polarizer according to claim 1 or 7, wherein: and controlling the film traction tension to be constant in the whole slitting process.
9. The slitting method of the PVA optical film for the polarizer of claim 8, wherein: the film traction tension is controlled by adjusting the speed of a conveying roller and a winding roller and the pressure of a pressing roller.
10. The slitting method of the PVA optical film for the polarizer of claim 8, wherein: the tension of the film is 100N/m-200N/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911046091.1A CN110980381A (en) | 2019-10-30 | 2019-10-30 | Slitting method of PVA (polyvinyl alcohol) optical film for polaroid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911046091.1A CN110980381A (en) | 2019-10-30 | 2019-10-30 | Slitting method of PVA (polyvinyl alcohol) optical film for polaroid |
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| CN110980381A true CN110980381A (en) | 2020-04-10 |
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| CN201911046091.1A Pending CN110980381A (en) | 2019-10-30 | 2019-10-30 | Slitting method of PVA (polyvinyl alcohol) optical film for polaroid |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004217398A (en) * | 2003-01-17 | 2004-08-05 | Fuji Iron Works Co Ltd | Winding device and winding method for slitter |
| CN101250275A (en) * | 2007-02-20 | 2008-08-27 | 富士胶片株式会社 | Method for producing cellulose acylate film |
| CN203699521U (en) * | 2014-01-22 | 2014-07-09 | 嘉兴鹏翔包装材料有限公司 | Thin film splitting machine |
| CN105000416A (en) * | 2015-06-06 | 2015-10-28 | 安庆市天润纸塑包装有限责任公司 | Splitting machine with automatic adjusting function |
| CN205416330U (en) * | 2016-03-19 | 2016-08-03 | 温州康达包装材料有限公司 | Biaxial stretching polypropylene film's cutting machine |
| CN205766372U (en) * | 2016-07-06 | 2016-12-07 | 南京索特包装制品有限公司 | Cutting machine and leftover material recycling device thereof |
| CN207467848U (en) * | 2017-10-10 | 2018-06-08 | 宁波福象包装科技有限公司 | A kind of winding structure of cork paper cutting machine |
| CN208601587U (en) * | 2018-05-31 | 2019-03-15 | 江苏清陶能源科技有限公司 | A kind of chamfered edge device being continuously coated with for film |
| CN209455795U (en) * | 2018-12-28 | 2019-10-01 | 日东电工株式会社 | The end edge portion of optical film cuts off separator |
-
2019
- 2019-10-30 CN CN201911046091.1A patent/CN110980381A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004217398A (en) * | 2003-01-17 | 2004-08-05 | Fuji Iron Works Co Ltd | Winding device and winding method for slitter |
| CN101250275A (en) * | 2007-02-20 | 2008-08-27 | 富士胶片株式会社 | Method for producing cellulose acylate film |
| CN203699521U (en) * | 2014-01-22 | 2014-07-09 | 嘉兴鹏翔包装材料有限公司 | Thin film splitting machine |
| CN105000416A (en) * | 2015-06-06 | 2015-10-28 | 安庆市天润纸塑包装有限责任公司 | Splitting machine with automatic adjusting function |
| CN205416330U (en) * | 2016-03-19 | 2016-08-03 | 温州康达包装材料有限公司 | Biaxial stretching polypropylene film's cutting machine |
| CN205766372U (en) * | 2016-07-06 | 2016-12-07 | 南京索特包装制品有限公司 | Cutting machine and leftover material recycling device thereof |
| CN207467848U (en) * | 2017-10-10 | 2018-06-08 | 宁波福象包装科技有限公司 | A kind of winding structure of cork paper cutting machine |
| CN208601587U (en) * | 2018-05-31 | 2019-03-15 | 江苏清陶能源科技有限公司 | A kind of chamfered edge device being continuously coated with for film |
| CN209455795U (en) * | 2018-12-28 | 2019-10-01 | 日东电工株式会社 | The end edge portion of optical film cuts off separator |
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