CN105599193B - A kind of drying means of polyvinyl alcohol optical thin film - Google Patents
A kind of drying means of polyvinyl alcohol optical thin film Download PDFInfo
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- CN105599193B CN105599193B CN201610137722.0A CN201610137722A CN105599193B CN 105599193 B CN105599193 B CN 105599193B CN 201610137722 A CN201610137722 A CN 201610137722A CN 105599193 B CN105599193 B CN 105599193B
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- Prior art keywords
- roller
- polyvinyl alcohol
- thin film
- optical thin
- drying unit
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0092—Drying moulded articles or half products, e.g. preforms, during or after moulding or cooling
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- Polarising Elements (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a kind of drying means of polyvinyl alcohol optical thin film, it is characterised in that：Polyvinyl alcohol water solution increases by one group of drying unit being made up of one or several rollers after roller is cast, the polyvinyl alcohol optical thin film is dried into drying unit from formation polyvinyl alcohol optical thin film after roller drying and moulding is peeled off is cast；By the regulation to each roller diameter, temperature, speed in drying unit, balanced polyvinyl alcohol optical thin film interior outside heat intensity, before being mitigated or eliminated one side it is heated and bring warpage, width upper the problem of having big difference.
Description
First, technical field
It is specifically a kind of to be used for polarisation the present invention relates to a kind of drying means of polyvinyl alcohol (PVA) optical thin film
The drying means of the polyvinyl alcohol optical thin film of piece production.
2nd, background technology
Polaroid enables to natural light that polarization phenomena occurs, and it and liquid crystal combination are become with image displaying function
Component, it is the key component in liquid crystal display.Polaroid is by the stretching of polyvinyl alcohol optical thin film, dyeing and fine with three acetic acid
Tie up plain film fitting to form, three cellulose acetate membrane mainly plays moistureproof damp proof protective effect, wherein dyed polyvinyl alcohol light
Learn film and possess polarizing properties, the quality of this layer film determines polaroid, the overall performance of liquid crystal display.
At present, polyvinyl alcohol optical thin film main production process is by polyvinyl alcohol casting film-forming soluble in water, with poly- second
Unlike the conventional plastics such as alkene, polypropylene film, need that processing is dried after polyvinyl alcohol casting film-forming to remove moisture.Cause
This, the production line that polyvinyl alcohol film is produced using aqueous solution the tape casting must be equipped with casting roller of the larger diameter with heating function
Cylinder, to ensure that film when rotating stripping in one week around roller, can have time enough shaping, otherwise film will be in because that can not dry
Glue-like, it can not be peeled off from roller surface.
In general, polyvinyl alcohol water solution aqueous about 70%, in order to ensure that film is peeled off, it is necessary to be down to 30% by aqueous
Hereinafter, i.e., 40% or so moisture is removed by drying.In the process, film inner surface is pressed close to roller one side heat intensity and is more than
Outer surface, heated time is longer, and longitudinal contraction and the horizontal stroke from two lateral center of film edge occur in dehydration process is dried
To contraction.Such film is being spread out in use, its marginal portion easily warpage, spreading is poor, and due to from center to both sides
Stress distribution, have more obvious position difference.
Film warpage can cause to stretch it is uneven, although can be mitigated or eliminated with the method for both sides cutting edge, simultaneously
Product size is reduced, yield is reduced, can cause product quality unqualified when serious.When position difference is larger, light can be caused
Interference effect, when liquid crystal display particularly large scale liquid crystal is shown, reduce imaging quality.
3rd, the content of the invention
The present invention is intended to provide a kind of drying means of polyvinyl alcohol optical thin film, optically thin to improve traditional polyvinyl alcohol
The shortcomings of easy warpage present in film production process, position difference fluctuation
The present invention solves technical problem, adopts the following technical scheme that：
The drying means of polyvinyl alcohol optical thin film of the present invention, its feature are：
Polyvinyl alcohol water solution is from formation polyvinyl alcohol optical thin film after roller drying and moulding is peeled off is cast, in curtain coating roller
Increase by one group of drying unit being made up of one or several rollers afterwards, enter the polyvinyl alcohol optical thin film and dry list
Member is dried；By the regulation to each roller diameter, temperature, speed in drying unit, in balanced polyvinyl alcohol optical thin film
Outside heat intensity, before being mitigated or eliminated one side it is heated and bring warpage, width upper the problem of having big difference.
The drying means of polyvinyl alcohol optical thin film of the present invention, its feature are lain also in：
The moisture content of polyvinyl alcohol optical thin film obtained after curtain coating roller drying and moulding is peeled off for 10~50% (preferably
15~30%) moisture content, through the dried polyvinyl alcohol optical thin film of drying unit is 1~10%.
The quantity for forming the roller of drying unit is 1~20, preferably 7~15.
The roller for forming drying unit can be metal material or other materials, be passed through in the roller
Heat medium, such as recirculated water, heat kerosene, electrical heating.
Above-mentioned roller diameter scope is 50mm~1000mm, preferably 150mm~600mm；Each roller diameter can with identical,
Can be the combination of different-diameter, diameter is too small to be unfavorable for heating, and excessive then processing cost is higher, expensive.Preferably, respectively
Roller is numbered successively with the distance apart from the curtain coating roller, and the diameter of odd-numbered roller is straight more than even-numbered roller
Effect is more preferable during footpath.
Above-mentioned roller width is according to depending on thin-film width.
The heating temperature range for forming each roller of drying unit is 20~100 DEG C, preferably 40~90 DEG C；Each roller temperature
Can be with identical or different temperatures combination.Preferably, each roller of drying unit is formed with apart from the curtain coating roller
Distance be numbered, effect is more preferable when the temperature of odd-numbered roller is more than even-numbered roller temperature.
Forming the rotating speed of each roller of drying unit can adjust, and rotating speed can be with identical or friction speed group
Close.Preferably, on the basis of the curtain coating roller rotating speed, the rotating speed of each roller is incremented by according to 0.8~1.0 ratio.
Compared with the prior art, beneficial effects of the present invention are embodied in：
1st, the present invention is made by setting the drying unit being made up of some rollers that film is dried after roller is cast
Film be heated evenly, warpage and position difference fluctuation the defects of preferably controlled, membrane quality has bigger lifting；
2nd, in the present invention, drying unit is combined into using the roller of multiple small diameters, roller manufacture difficulty is small, and economy can
OK；
3rd, in the present invention, the uniform of film interior outside can be realized by changing the parameters such as roller diameter, temperature, speed
Heating；
4th, illustrate
Fig. 1 is the schematic diagram of drying unit of the present invention；
Label in figure：1 is curtain coating roller；2 be 1# rollers, and 3 be 2# rollers, and 4 be n-1# rollers, and 5 be n# rollers.
5th, embodiment
As shown in figure 1, the drying means of polyvinyl alcohol optical thin film of the present invention, be increase after roller is cast one group by
The drying unit that n roller is formed, polyvinyl alcohol water solution form polyvinyl alcohol optics from after being cast the stripping of the drying and moulding of roller 1
Film, by packaging film feeding to the unit (successively by 1# rollers 2,2# rollers 3 ..., n-1# rollers 4 and n# rollers 5), be dried to
Type is wound.Roller quantity, diameter, temperature, rotating speed and implementation result are as follows：
Embodiment 1：Roller quantity n=7
The drying unit of setting the present embodiment is made up of 7 rollers, the rotating speed of each roller compared to curtain coating roller ratio,
The temperature and diameter of each roller are shown in Table 1.
Table 1 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 2：Roller quantity 7
The drying unit of setting the present embodiment is made up of 7 rollers, the rotating speed of each roller compared to curtain coating roller ratio,
The temperature and diameter of each roller are shown in Table 2.
Table 2 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 3：Roller quantity 7
The drying unit of setting the present embodiment is made up of 7 rollers, the rotating speed of each roller compared to curtain coating roller ratio,
The temperature and diameter of each roller are shown in Table 3.
Table 3 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 4：Roller quantity 11
The drying unit of setting the present embodiment is made up of 11 rollers, and the rotating speed of each roller is compared to the ratio for being cast roller
Example, the temperature of each roller and diameter are shown in Table 4.
Table 4 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 5：Roller quantity 1
The drying unit of setting the present embodiment is made up of 1 roller, the rotating speed of the roller compared to curtain coating roller ratio,
The temperature and diameter of roller are shown in Table 5.
Table 5 forms rotating speed, temperature and the diameter of the roller of drying unit
The data comparison of embodiment 1~5
Polyvinyl alcohol water solution is peeled off by curtain coating roller 1 drying and moulding, is respectively led into the drying unit of embodiment 1~5
After being dried, the performance of products obtained therefrom is shown in Table 6.
The performance comparison of each embodiment products obtained therefrom of table 6
Claims (5)
- A kind of 1. drying means of polyvinyl alcohol optical thin film, it is characterised in that：Polyvinyl alcohol water solution forms polyvinyl alcohol optical thin film from after being cast the stripping of roller drying and moulding, after roller is cast Increase by one group of drying unit being made up of one or several rollers, the polyvinyl alcohol optical thin film is entered into drying unit Row drying；By the regulation to each roller diameter, temperature, speed in drying unit, balanced polyvinyl alcohol optical thin film interior outside Heat intensity, before being mitigated or eliminated one side it is heated and bring warpage, width upper the problem of having big difference；Each roller of drying unit will be formed, be numbered successively with the distance apart from the curtain coating roller；Each roller diameter scope for forming drying unit is 50mm~1000mm, and the diameter of odd-numbered roller is compiled more than even number Number roller diameter；The heating temperature range for forming each roller of drying unit is 20~100 DEG C, and the temperature of odd-numbered roller is more than occasionally Number numbering roller temperature；The rotating speed for forming each roller of drying unit is on the basis of the curtain coating roller rotating speed, is passed according to 0.8~1.0 ratio Increase.
- 2. the drying means of polyvinyl alcohol optical thin film according to claim 1, it is characterised in that：Dried through being cast roller The moisture content for the polyvinyl alcohol optical thin film that shaping obtains after peeling off is 10~50%, through the dried polyvinyl alcohol of drying unit The moisture content of optical thin film is 1~10%.
- 3. the drying means of polyvinyl alcohol optical thin film according to claim 1, it is characterised in that：Form drying unit The quantity of roller is 1~20.
- 4. the drying means of polyvinyl alcohol optical thin film according to claim 3, it is characterised in that：Form drying unit The quantity of roller is 7~15.
- 5. the drying means of polyvinyl alcohol optical thin film according to claim 1, it is characterised in that：Forming drying unit Each roller in be passed through heating medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137722.0A CN105599193B (en) | 2016-03-10 | 2016-03-10 | A kind of drying means of polyvinyl alcohol optical thin film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137722.0A CN105599193B (en) | 2016-03-10 | 2016-03-10 | A kind of drying means of polyvinyl alcohol optical thin film |
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| Publication Number | Publication Date |
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| CN105599193A CN105599193A (en) | 2016-05-25 |
| CN105599193B true CN105599193B (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610137722.0A Active CN105599193B (en) | 2016-03-10 | 2016-03-10 | A kind of drying means of polyvinyl alcohol optical thin film |
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| CN110884010B (en) * | 2019-10-30 | 2022-04-05 | 中国石油化工股份有限公司 | Preparation method of PVA film with smooth surface |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1026349A (en) * | 1961-10-27 | 1966-04-20 | Kurashiki Rayon Kk | Method of manufacturing thin films of polyvinyl alcohols |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60108550T2 (en) * | 2000-05-02 | 2006-01-12 | KURARAY CO., LTD, Kurashiki | Polymer film of polyvinyl alcohol, process for their preparation and polarizing film |
| JP6185734B2 (en) * | 2012-03-30 | 2017-08-23 | 株式会社クラレ | Method for producing polyvinyl alcohol polymer film |
| CN103360615B (en) * | 2012-04-06 | 2016-06-08 | 何越赋 | A kind of water-soluble membrane production equipment of energy-saving durable |
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- 2016-03-10 CN CN201610137722.0A patent/CN105599193B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1026349A (en) * | 1961-10-27 | 1966-04-20 | Kurashiki Rayon Kk | Method of manufacturing thin films of polyvinyl alcohols |
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Denomination of invention: A drying method for polyvinyl alcohol optical thin films Effective date of registration: 20230710 Granted publication date: 20180406 Pledgee: Industrial and Commercial Bank of China Limited Chaohu sub branch Pledgor: ANHUI WANWEI UPDATED HIGH-TECH MATERIAL INDUSTRY Co.,Ltd. Registration number: Y2023980047850 |