CN105599193A - Method for drying polyvinyl alcohol optical film - Google Patents
Method for drying polyvinyl alcohol optical film Download PDFInfo
- Publication number
- CN105599193A CN105599193A CN201610137722.0A CN201610137722A CN105599193A CN 105599193 A CN105599193 A CN 105599193A CN 201610137722 A CN201610137722 A CN 201610137722A CN 105599193 A CN105599193 A CN 105599193A
- Authority
- CN
- China
- Prior art keywords
- polyvinyl alcohol
- roller
- drying
- thin film
- optical thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001035 drying Methods 0.000 title claims abstract description 60
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 47
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title abstract description 9
- 239000012788 optical film Substances 0.000 title abstract 5
- 238000007766 curtain coating Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 31
- 239000010409 thin film Substances 0.000 claims description 30
- 239000010408 film Substances 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Polarising Elements (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for drying a polyvinyl alcohol optical film. The method is characterized by comprising the steps that after a polyvinyl alcohol water solution is dry-molded and stripped from a curtain coating roller, the polyvinyl alcohol optical film is formed, a set of drying unit formed by one or more rollers is additionally arranged behind the curtain coating roller, and the polyvinyl alcohol optical film is made to enter the drying unit to be dried. The diameters, temperatures and speeds of all the rollers in the drying unit are adjusted, the heating strengths of the inner face and the outer face of the polyvinyl alcohol optical film are balanced, and the problems of warping and the too large width-direction phase difference caused by previous single-face heating are relieved or eliminated.
Description
One, technical field
The present invention relates to the drying means of a kind of polyvinyl alcohol (PVA) optical thin film, specifically a kind of raw for polaroidThe drying means of the polyvinyl alcohol optical thin film producing.
Two, background technology
Polaroid can make natural daylight generation polarization phenomena, and it and liquid crystal are combined, and becomes the assembly with image displaying function,It is the key component in liquid crystal display. Polaroid is to stretch, dye and and three cellulose acetate membrane by polyvinyl alcohol optical thin filmLaminating forms, and three cellulose acetate membrane mainly plays moistureproof damp proof protective effect, wherein dyed polyvinyl alcohol optical thin film toolStandby polarizing properties, the quality of this layer film has determined the overall performance of polaroid, liquid crystal display.
At present, the main production method of polyvinyl alcohol optical thin film is by casting film-forming soluble in water polyvinyl alcohol, with polyethylene, poly-The conventional plastic maskings such as propylene are different, need to be dried to process to remove moisture after polyvinyl alcohol casting film-forming. Therefore, makeThe production line of water solution casting method production polyvinyl alcohol film must be equipped with the curtain coating roller of larger diameter band heating function, to protectCard film, rotating around roller while within one week, peeling off, can have time enough moulding, otherwise film will be glue-like because being dried,Cannot peel off from roller surface.
In general, polyvinyl alcohol water solution is moisture approximately 70%, in order to ensure that film peels off, need to be down to below 30% moisture,By the dry 40% left and right moisture of removing. In this process, film inner surface is pressed close to the one-sided heat intensity of roller and is greater than outer surface,Heated time is longer, and in dry dehydration process, longitudinal contraction and the cross-direction shrinkage from film edge two side direction centers occurs. ThisThe film of sample is spreading out while using, very easily warpage of its marginal portion, and spreading is poor, and due to the stress distribution from middle mind-set both sides,There is comparatively significantly phasic difference.
Film warpage can cause and stretch inhomogeneously, although can alleviate or eliminate by the method for both sides cutting edge, the while has also reducedProduct size, reduces output, when serious, can cause product quality defective. When phasic difference is larger, can cause the interference effect of lightShould, when particularly large scale liquid crystal shows, reduce video picture quality in liquid crystal display.
Three, summary of the invention
The present invention aims to provide a kind of drying means of polyvinyl alcohol optical thin film, produces to improve traditional polyvinyl alcohol optical thin filmThe shortcoming such as easy warpage, phasic difference fluctuation existing in technique
Technical solution problem of the present invention, adopts following technical scheme:
The drying means of polyvinyl alcohol optical thin film of the present invention, its feature is:
Polyvinyl alcohol water solution is peeled off rear formation polyvinyl alcohol optical thin film from curtain coating roller drying and moulding, after curtain coating roller, increasesAdd one group of drying unit being formed by one or several rollers, make described polyvinyl alcohol optical thin film enter drying unit and doDry; By the adjusting to each roller diameter, temperature, speed in drying unit, in balanced polyvinyl alcohol optical thin film, outside is heatedIntensity, alleviate or eliminate before one side be heated and the upper problem having big difference of warpage, width brought.
The drying means of polyvinyl alcohol optical thin film of the present invention, its feature is also:
The moisture content of polyvinyl alcohol optical thin film obtaining after curtain coating roller drying and moulding is peeled off is 10～50% (preferably15～30%), the moisture content of the dried polyvinyl alcohol optical thin film in drying unit is 1～10%.
The quantity that forms the roller of drying unit is 1～20, preferably 7～15.
The roller that forms drying unit can be metal material, can be also other material, has passed into heating and be situated between in described rollerMatter, as recirculated water, heat kerosene, electrical heating etc.
Above-mentioned roller diameter scope is 50mm～1000mm, preferably 150mm～600mm; Each roller diameter can be identical, alsoCan be the combination of different-diameter, too small being unfavorable for of diameter heats, and excessive processing cost is higher, expensive. Preferably,Each roller is numbered successively with the distance of the described curtain coating roller of distance, and it is straight that the diameter of odd-numbered roller is greater than even-numbered rollerBetter effects if when footpath.
Above-mentioned roller width is determined according to thin-film width.
The heating-up temperature scope that forms each roller of drying unit is 20～100 DEG C, preferably 40～90 DEG C; Each roller temperature can phaseWith, can be also the combination of different temperatures. Preferably, form each roller of drying unit with the distance of the described curtain coating roller of distanceBe numbered better effects if when the temperature of odd-numbered roller is greater than even-numbered roller temperature.
The rotating speed that forms each roller of drying unit can be adjusted, and rotating speed can be identical, can be also the combination of friction speed. ExcellentChoosing, taking described curtain coating roller rotating speed as benchmark, the rotating speed of each roller increases progressively according to 0.8～1.0 ratio.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is dried film by the drying unit being made up of some rollers is set after curtain coating roller, the film makingBe heated evenly, the defects such as warpage and phasic difference fluctuation are better controlled, and membrane quality has larger lifting;
2, in the present invention, adopt the roller of multiple small diameters to be combined into drying unit, roller manufacture difficulty is little, economically feasible;
3,, in the present invention, can, by changing the parameters such as roller diameter, temperature, speed, realize the homogeneous heating of outside in film;
Four, brief description of the drawings
Fig. 1 is the schematic diagram of drying unit of the present invention;
Number in the figure: 1 is curtain coating roller; 2 is 1# roller, and 3 is 2# roller, and 4 is n-1# roller, and 5 is n# roller.
Five, detailed description of the invention
As shown in Figure 1, the drying means of polyvinyl alcohol optical thin film of the present invention, is after curtain coating roller, to increase by one group by nThe drying unit that roller forms, polyvinyl alcohol water solution is peeled off rear formation polyvinyl alcohol optical thin film from curtain coating roller 1 drying and moulding,By packaging film feeding to this unit (pass through successively 1# roller 2,2# roller 3 ..., n-1# roller 4 and n# roller 5), be dried toType rolling. 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, and the rotating speed of each roller is than the ratio of curtain coating roller, each rollerThe temperature of cylinder and diameter are in table 1.
Table 1 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 2: 7 of roller quantity
The drying unit of setting the present embodiment is made up of 7 rollers, and the rotating speed of each roller is than the ratio of curtain coating roller, each rollerThe temperature of cylinder and diameter are in table 2.
Table 2 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 3: 7 of roller quantity
The drying unit of setting the present embodiment is made up of 7 rollers, and the rotating speed of each roller is than the ratio of curtain coating roller, each rollerThe temperature of cylinder and diameter are in table 3.
Table 3 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 4: 11 of roller quantity
The drying unit of setting the present embodiment is made up of 11 rollers, and the rotating speed of each roller is than the ratio of curtain coating roller, each rollerThe temperature of cylinder and diameter are in table 4.
Table 4 forms rotating speed, temperature and the diameter of each roller of drying unit
Embodiment 5: 1 of roller quantity
The drying unit of setting the present embodiment is made up of 1 roller, and the rotating speed of this roller is than ratio, the roller of curtain coating rollerTemperature and diameter in table 5.
Table 5 forms rotating speed, temperature and the diameter of the roller of drying unit
Embodiment 1～5 Data Comparison
Polyvinyl alcohol water solution is peeled off through curtain coating roller 1 drying and moulding, and the drying unit that causes respectively embodiment 1～5 is doneAfter dry, the performance of products obtained therefrom is in table 6.
The performance comparison of the each embodiment products obtained therefrom of table 6
Claims (10)
1. a drying means for polyvinyl alcohol optical thin film, is characterized in that:
Polyvinyl alcohol water solution is peeled off rear formation polyvinyl alcohol optical thin film from curtain coating roller drying and moulding, after curtain coating roller, increasesAdd one group of drying unit being formed by one or several rollers, make described polyvinyl alcohol optical thin film enter drying unit and doDry; By the adjusting to each roller diameter, temperature, speed in drying unit, in balanced polyvinyl alcohol optical thin film, outside is heatedIntensity, alleviate or eliminate before one side be heated and the upper problem having big difference of warpage, width brought.
2. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: dry through curtain coating rollerThe moisture content that the polyvinyl alcohol optical thin film of rear acquisition is peeled off in dry moulding is 10～50%, the dried polyvinyl alcohol light in drying unitThe moisture content of learning film is 1～10%.
3. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: form drying unitThe quantity of roller be 1～20.
4. the drying means of polyvinyl alcohol optical thin film according to claim 3, is characterized in that: form drying unitThe quantity of roller be 7～15.
5. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: forming dry listIn each roller of unit, pass into heat medium.
6. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: form drying unitEach roller diameter scope be 50mm～1000mm.
7. according to the drying means of the polyvinyl alcohol optical thin film described in claim 1 or 6, it is characterized in that: form dryEach roller of unit, is numbered successively with the distance of the described curtain coating roller of distance, and the diameter of odd-numbered roller is greater than even number and compilesNumber roller diameter.
8. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: form drying unitThe heating-up temperature scope of each roller be 20～100 DEG C.
9. according to the drying means of the polyvinyl alcohol optical thin film described in claim 1 or 8, it is characterized in that: form dryEach roller of unit, is numbered with the distance of the described curtain coating roller of distance, and the temperature of odd-numbered roller is greater than even-numbered rollerCylinder temperature.
10. the drying means of polyvinyl alcohol optical thin film according to claim 1, is characterized in that: form drying unitThe rotating speed of each roller be taking described curtain coating roller rotating speed as benchmark, increase progressively according to 0.8～1.0 ratio.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105599193A true CN105599193A (en) | 2016-05-25 |
| CN105599193B CN105599193B (en) | 2018-04-06 |
Family
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Family Applications (1)
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105599193B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110884010A (en) * | 2019-10-30 | 2020-03-17 | 中国石油化工股份有限公司 | Preparation method of PVA film with smooth surface |
Citations (4)
| 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 |
| CN1182195C (en) * | 2000-05-02 | 2004-12-29 | 可乐丽股份有限公司 | Polyvinyl alcohol polymer film, its preparation process and polarized light film |
| CN103360615A (en) * | 2012-04-06 | 2013-10-23 | 何越赋 | A kind of water soluble film production unit of energy-saving durable |
| JP2013228718A (en) * | 2012-03-30 | 2013-11-07 | Kuraray Co Ltd | Manufacturing method of polyvinyl alcohol-based polymer film |
-
2016
- 2016-03-10 CN CN201610137722.0A patent/CN105599193B/en active Active
Patent Citations (5)
| 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 |
| US3471594A (en) * | 1961-10-27 | 1969-10-07 | Kuraray Co | Methods of manufacturing polyvinyl alcohol films |
| CN1182195C (en) * | 2000-05-02 | 2004-12-29 | 可乐丽股份有限公司 | Polyvinyl alcohol polymer film, its preparation process and polarized light film |
| JP2013228718A (en) * | 2012-03-30 | 2013-11-07 | Kuraray Co Ltd | Manufacturing method of polyvinyl alcohol-based polymer film |
| CN103360615A (en) * | 2012-04-06 | 2013-10-23 | 何越赋 | A kind of water soluble film production unit of energy-saving durable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110884010A (en) * | 2019-10-30 | 2020-03-17 | 中国石油化工股份有限公司 | Preparation method of PVA film with smooth surface |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105599193B (en) | 2018-04-06 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
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 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
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 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |