CN104497329A - Side-thickened polyamic acid film, tape casting equipment and preparation method thereof - Google Patents
Side-thickened polyamic acid film, tape casting equipment and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a side-thickened polyamic acid film, tape casting equipment and a preparation method thereof, and belongs to the field of film preparation. The two lateral side parts of the film gradually increase with the thickness close to the outer edge within an X-wide range, X is 20-200 mm, and the thickness distribution of the film is symmetrical relative to the longitudinal central line of the film. The openness of a lip within a Y length range at the two side parts of a forming mold lip of the tape casting equipment gradually increases with the openness close to the outer edge, and the openness of the lip is symmetrical relative to the longitudinal central line of the lip. The preparation method comprises adjusting the bolt of the forming mold lip to obtain the necessary forming mold lip. According to the invention, since the thicknesses of the two side parts of the film are increased, the strength is increased, the strength of the film at an acting point of a clamping device in a subsequent procedure is increased to avoid unclamping or releasing or edge damage caused by clamping damage and pull damage, so that the product yield is greatly improved; the tape casting equipment and the preparation method disclosed by the invention are easy to achieve, and only the lip bolt is adjusted to increase the openness at the two sides of the lip.
Description
Technical field
The present invention relates to Kapton technology of preparing, be specially the Polyamic Acid Film of a kind of side thickening, its salivation equipment and preparation method.
Background technology
Kapton is the macromolecular material with high strength, high tenacity, abrasion performance, the excellent properties such as high temperature resistant, corrosion-resistant, is the predominating insulation making various medium-to-high grade electrotechnical, electronic components and parts, is widely used in electrotechnical, electronic industry.The preparation technology of current Kapton is with polyamic acid resin solution for raw material, and on slobbering machine, salivation obtains the Polyamic Acid Film of self-supporting, then through adding thermal stretch, high temperature imidization, cooling and shaping process obtain Kapton.
The design requirements of and high reliability light, thin, short, little along with downstream application product, the film thickness specification of the market requirement is tending towards slimming, to its technology of preparing, quality product particularly product yield all have higher requirement.
In Kapton preparation process, the conventional manufacturing process of drawing and setting or tensioning sizing that adopts reaches required thickness and traditional performance.All need two sides gripping Kapton work in-process Polyamic Acid Film when drawing and setting or tensioning sizing, rely on the clamping device of film both sides to apply horizontal force to film under the high temperature conditions, namely cross directional stretch is carried out to film.Also need during longitudinal stretching to grip film dual-side, avoid film to reduce width to central reduction distortion.
Such as, when Kapton is produced, normally polyamic acid resin is shaped to Polyamic Acid Film by salivation mode on slobbering machine, carries out imidization process by High Temperature Furnaces Heating Apparatus afterwards and obtain Kapton.The bilateral of work in-process film to be gripped in imidization, make film under clamp position, carry out cross directional stretch or tensioning process, and keep this state to complete high temperature imidization, to improve the traditional performance of film.
The clamping device of existing film line both sides is mainly and is arranged on chain pincers on the chain of ring-shaped guide rail or pin is buckled.The imidization that vertical cross directional stretch all will carry out pyroprocessing, particularly Polyamic Acid Film to film needs the process of higher temperature, and maximum processing temperature can reach 500 DEG C.Chain in production line and on chain pincers or pin buckle temperature in high temperature environments and also increase, when stretching entry position clamping film very easily because high temperature causes film side to clip broken or tear, the film of side breakage in follow-up stretching, imidization, shape and open in the technological processs such as folder and easily buckle thorn button bit in chain pincers pincers mouth position or pin and put and cause de-pincers or dropout and pulled open, reduce film stretching quality, even film cannot normally rolling, reduce film product yield, have a strong impact on film line output.
Meanwhile, the edge of Polyamic Acid Film upwarps phenomenon due to too thin easy generation, makes film side edge break build up double-deck limit during the clamping of chain pincers.Running into high temperature in the clamping process of double-deck limit makes chain pincers clip position film easily tear, and causes product can not normally rolling equally, reduction film product yield.
In actual production line, Kapton open pincers position close to traction wrap-up, when driving pincers, film is subject to the comprehensive actions such as tensile stress, drawing tension and winding tension and easily occurs the rupture of membranes such as raw edges, transverse breakage phenomenon, so that film cannot normally rolling, have a strong impact on thin film yield, reduce film yield.
In order to solve edge damage in Kapton preparation process, the problems such as disconnected film, in recent years there is relevant patent application, as the Chinese utility model patent " the entering pincers guide arrangement of membrane production equipment " that notification number is CN202245464U, publication number is the Chinese invention patent " the chain pincers refrigerating unit of film production machinery " of CN102441987A, publication number is the Chinese invention patent " the opening pincers device in advance of film line " of CN102431161A, publication number is the Chinese invention patent " film clamping device of film of film stretching sizing or tensioning standard equipment " of CN102390112A, notification number is the Chinese utility model patent " a kind of solution film stretching rupture of membranes and thickness homogeneous system " of CN203236699U, wherein individually disclose into pincers guide arrangement, chain pincers refrigerating unit, drive pincers device and clamping device etc. in advance, although clamping device is caused clip broken or Tear Film side problem some reduce, but and fail to eliminate this type of fault completely.And these devices all need to transform existing apparatus for production line or replace, apparatus structure is comparatively complicated, also needs higher improvement cost, therefore is difficult to extensively practice.
In addition publication number is the Chinese invention patent " adhesive tape processing method in film production of slobbering machine " of CN102416684A, publication number is the Chinese invention patent " method for adhesive tape treatment in production of thin film by casting machine " of CN102303388A, notification number is the Chinese utility model patent " polyimide film producing device of automatic erasing releasing agent " etc. of CN202147343U is cause rupture of membranes by improving manufacturing process process salivation adhesive tape, disconnected films etc. are abnormal, adjusting process parameter is more, regulation range is large, particularly introduce as wiping releasing agent can cause film too smooth cannot normal use in the side effect etc. of derived product.
Summary of the invention
The object of the invention is the Polyamic Acid Film designing the thickening of a kind of side, increase gradually with close to outer edge thickness within the scope of the horizontal two side parts one fixed widthes of film, because film both sides are increased by its intensity of retaining part enlarged in thickness thereupon, no longer clipped broken or the fault of raw edges by during clamping, ensure that the quality of film, improve thin film yield.
Another object of the present invention is the salivation equipment of the Polyamic Acid Film that a kind of side of design thickeies, the side parts aperture of the salivation forming mould lip used certain length of polyamic acid solution increases gradually with close to outer rim aperture, gained polyamic acid is salivated within the scope of the horizontal two side parts one fixed widthes of liquid film and increases gradually with close to outer edge thickness.
Another object of the present invention is the preparation method of the Polyamic Acid Film that a kind of side of design thickeies, when polyamic acid solution salivates, regulate salivation forming mould lip, the side parts aperture of forming mould lip certain length is increased gradually with close to outer rim aperture, obtain within the scope of horizontal two side parts one fixed widthes with the polyamic acid salivation liquid film increased gradually close to outer edge thickness, obtain the self-supporting Polyamic Acid Film that laterally two side parts thicken after drying process, no longer clip broken during to ensure that film is clamped or the fault of raw edges.
The Polyamic Acid Film of a kind of side thickening of the present invention's design, increases gradually with close to outer edge thickness in the scope of the wide X of two side parts of its transverse direction, described X=20 ~ 200mm, preferred range is X=60 ~ 120mm.Central film portion thickness is H, and reinforcement thickness is the maximum value of h, h > H, h is (1.2 ~ 3) H.A and A ' point on Polyamic Acid Film cross section bottom line is X with the distance of bottom line homonymy outer rim, and certain point on bottom line outside A is x with the distance of homonymy film outer rim, and the film thickness of this point is h, h=a
1(X-x)
n/ 10
9+ a
2(X-x)
n-1/ 10
7+ a
3(X-x)
n-2/ 10
5+ a
4(X-x)/10
3+ H, n are the integer of 2 ~ 4,1.5 > a
1> 0,1.0 > a
2>-1.0,1.0 > a
3>-1.0,0 > a
4>-1.0.The thickness distribution of Polyamic Acid Film is symmetrical with film longitudinal cenlerline.
The salivation equipment of the Polyamic Acid Film of the side thickening of the present invention's design, comprise forming mould, the circulation steel band of the shaping polyamic acid liquid film of carrying salivation and hot-air oven, lip aperture within the scope of the long Y of its forming mould lip two side parts increases gradually with close to outer rim aperture, and gained salivation polyamic acid liquid film laterally two side parts one fixed widthes increases with close to outer edge thickness.Described Y=20 ~ 200mm, preferred range is Y=60 ~ 120mm.In the middle part of forming mould lip, aperture is W, and within the scope of Y, forming mould lip aperture is the maximum value of w, w > W, w is (1.2 ~ 3) W.B and B ' point on straight line M vertical with steel band working direction in the plane in lip right on is Y with the distance of homonymy lip outer end, between B, B ' two, lip aperture is W, certain point on straight line M outside B is y with the distance of homonymy lip outer end, and the lip aperture of this point is w
W=b
1(Y-y)
n/ 10
9+ b
2(Y-y)
n-1/ 10
7+ b
3(Y-y)
n-2/ 10
5+ b
4(Y-y)/10
3+ W, n are the integer of 2 ~ 4,1.5 > b
1> 0,1.0 > b
2>-1.0,1.0 > b
3>-1.0,0 > b
4>-1.0.The lip aperture of forming mould is symmetrical with lip longitudinal cenlerline.
The preparation method of the Polyamic Acid Film of the side thickening of the present invention's design, the polyamic acid solution of synthesis salivates through forming mould and becomes polyamic acid liquid film on steel band, and the steel band being loaded with polyamic acid liquid film becomes the Polyamic Acid Film of self-supporting through hot-air oven drying.When polyamic acid solution salivates, be adjusted to mould lip bolt, lip aperture within the scope of the long Y of forming mould lip two side parts is increased gradually with close to outer rim aperture, described Y=20 ~ 200mm, in the middle part of forming mould lip, aperture is W, within the scope of Y, forming mould lip aperture is the maximum value of w, w > W, w is (1.2 ~ 3) W.The lip aperture of forming mould is symmetrical with lip longitudinal cenlerline.Be adjusted to along bolt on mould lip two ends, make the lip of the long Y scope of forming mould lip two ends side parts upwarps along outer end, lower edge is still horizontal linear; Or to be adjusted on mould lip two ends edge and lower to bolt, to make forming mould lip upwarps along two ends, lower curved under two ends.
Improve further to allow the intensity of Polyamic Acid Film dual-side, regulate the air outlet at each plenum chamber top in hot-air oven, make to be in the air outlet of discharging the long Z scope of side parts in air port in plenum chamber top one to increase gradually with close to sidewall, bore, make to increase gradually within the scope of the side parts one fixed width of plenum chamber transverse direction, with close to plenum chamber inner side-wall air quantity, in plenum chamber, the hot blast blast of middle part film surface is F, the hot blast blast of the film surface of two side parts is f, the maximum value of f > F, f is (1.2 ~ 3) F.
Because in plenum chamber, the hot blast blast of two side parts film surfaces is large compared with middle part, in the scope of the wide X of side parts of polyamic acid liquid film transverse direction, increase gradually with the steam output close to outer rim solvent, after salivation oven, in the scope of the wide X of horizontal two side parts of the self-supporting Polyamic Acid Film obtained, reduce gradually with close to outer rim solvent, therefore the intensity of gained self-supporting Polyamic Acid Film both sides edge improves, clip broken when being clamped to prevent film or the fault of raw edges.
The method of further raising Polyamic Acid Film dual-side intensity also has, at self-supporting Polyamic Acid Film after steel band stripping, side parts within the scope of film X=20 ~ 200mm carries out local heating, side parts film surface Heating temperature is 150 ~ 200 DEG C, and heat-up time is 8 seconds ~ 80 seconds.Content reduces further, imines rate improves because solvent partly evaporates again to pass through the film side parts heated, and its intensity is strengthened.
Compared with prior art, the advantage of the Polyamic Acid Film that side of the present invention thickeies, its salivation equipment and preparation method is: 1, the thickness of Polyamic Acid Film two side parts is greater than interior thickness, the increasing of thickness makes it intensity to be increased, namely when this back draft or tensioning, the chain pincers of clamping device or the thin film strength of fibula origin of force increase, make because clipping broken, pulling open the de-pincers that causes or dropout fault no longer occurs, by testing, the situation of edge damage, disconnected film almost no longer occurs, and film product yield improves greatly; 2, the preparation method of the Polyamic Acid Film of both sides of the present invention thickening is easy to realize, and only need be adjusted to the lip bolt of mould, the aperture of lip both sides can be made to strengthen, and obtains the polyamic acid salivation liquid film that both sides thicken.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of the Polyamic Acid Film embodiment that this side thickeies.
Fig. 2 is the front elevational schematic of the salivation apparatus embodiments 1 forming mould lip of the Polyamic Acid Film that this side thickeies.
Fig. 3 is the front elevational schematic of the salivation apparatus embodiments 2 forming mould lip of the Polyamic Acid Film that this side thickeies.
Number in the figure is: 1, film, 2, forming mould lip.
Embodiment
The Polyamic Acid Film embodiment that side thickeies
The cross section of the Polyamic Acid Film embodiment that this side thickeies as shown in Figure 1, increase gradually with close to outer edge thickness in two side parts of its transverse direction, the scope of wide X=100mm, film 1 interior thickness H=0.06mm, the outer edge thickness of side is 0.131mm to the maximum, A and the A ' point of film 1 both sides is X=100mm apart from the distance of homonymy film 1 outer rim respectively, and certain point outside A is x with the distance of homonymy film 1 outer rim, and film 1 thickness of this point is h, this routine n=4
h＝0.073(X-x)
4/10
9+0.069(X-x)
3/10
7+0.613(X-x)
2/10
5-0.045(X-x)/10
3+0.06
Outer most edge x=0,
h＝0.073×10
8/10
9+0.069×10
6/10
7+0.613×10
4/10
5-0.045×10
2/10
3+0.06＝0.131mm。
The thickness distribution of Polyamic Acid Film 1 is symmetrical with film longitudinal cenlerline.
Take uniform thickness as the film of D=60 μm be comparative example, carry out cross directional stretch with the present embodiment film under the draw ratio that identical temperature is identical, the following process of longitudinal stretching and tensioning imidization tests, the two result is as shown in table 1:
Table 1 the present embodiment and comparative example following process situation comparison sheet
From the results shown in Table 1, the Polyamic Acid Film horizontal edge damage number of operation that draws in following process process adopting the side of the present embodiment to thicken is only 1.2% of traditional films.Vertical drawing also obviously is reduced with edge damage number of times in imidization operation, and the total disconnected film number of times on Production Line for Polyimide Film is tending towards 0, and product yield is up to 96.0%, and product yield reaches 92.0%.
The salivation apparatus embodiments 1 of the Polyamic Acid Film that side thickeies
The salivation equipment of the Polyamic Acid Film that this routine side thickeies, comprise forming mould, the circulation steel band of carrying polyamic acid liquid film and hot-air oven, the forming mould of this example is salivation mouth, its lip 2 front view as shown in Figure 2, aperture W=0.262mm in the middle part of lip 2, the lip 2 of the long Y=100mm scope of salivation lip mouth 2 two ends side parts upwarps along outer end, lower edge is still horizontal linear, within the scope of lip 2 both sides 100mm, aperture is with close to outer rim, aperture increases gradually, at lip 2 two ends, aperture is 0.574mm to the maximum, B and B ' point on lip 2 times edges is Y=100mm with the distance of homonymy lip 2 outer end, lip 2 times distances along certain point outside upper B and homonymy lip 2 outer end are y, lip 2 aperture of this point is w, this routine n=4,
w＝1.313(Y-y)
4/10
9+0.838(Y-y)
3/10
7+0.975(Y-y)
2/10
5-0.009(Y-y)/10
3+0.262。
Lip 2 aperture of salivation mouth is symmetrical with lip longitudinal cenlerline.
Gained polyamic acid liquid film interior thickness is 0.262mm, and both sides of the edge maximum ga(u)ge is 0.574mm.The Polyamic Acid Film that the side that just can obtain above-described embodiment after drying thickeies.The salivation apparatus embodiments 2 of the Polyamic Acid Film that side thickeies
In the salivation equipment of the Polyamic Acid Film of the side thickening of this example, forming mould is extrusion die, its lip 2 front view as shown in Figure 3, extrusion die lip upwarps along two ends, lower curved under two ends, aperture W=0.262mm in the middle part of lip, lip 2 aperture of the long Y=100mm scope of lip 2 two ends side parts, increase gradually with close to outer rim aperture, at lip 2 two ends, aperture is 0.574mm to the maximum, B and B ' puts on the positive frontal plane of lip 2 perpendicular to steel band working direction, with up and down along on equidistant medullary ray, B and B ' point is Y=100mm with the distance of homonymy lip outer end, certain point on above-mentioned medullary ray outside B is y with the distance of homonymy lip 2 outer end, lip 2 aperture of this position is w, this routine n=4,
w＝1.313(Y-y)
4/10
9+0.838(Y-y)
3/10
7+0.975(Y-y)
2/10
5-0.009(Y-y)/10
3+0.262。
Lip 2 aperture of extrusion die is symmetrical with lip longitudinal cenlerline.
The salivation equipment other parts of this example are identical with above-mentioned salivation apparatus embodiments 1.
Preparation method's embodiment 1 of the Polyamic Acid Film that side thickeies
The polyamic acid solution that preparation method's embodiment 1 of the Polyamic Acid Film that this side thickeies is synthesized salivates into polyamic acid liquid film through forming mould on steel band, the steel band being loaded with polyamic acid liquid film becomes the Polyamic Acid Film of self-supporting through hot-air oven drying, the forming mould of this routine polyamic acid solution salivation is salivation mouth, its lip 2 front view as shown in Figure 2, aperture W=0.262mm in the middle part of lip 2, regulate on salivation lip mouth 2 two ends along bolt, make the lip 2 of the long Y=100mm scope of salivation lip mouth 2 two ends side parts upwarps along outer end, lower edge is still horizontal linear, within the scope of lip 2 both sides 100mm, aperture is with close to outer rim, aperture increases gradually, at lip 2 two ends, aperture is 0.574mm to the maximum, obtain the salivation mouth of the salivation apparatus embodiments 1 of the Polyamic Acid Film that side thickeies.
Also the curve on edge on lip 2 can be selected through the salivation mouth of special processing, and lip 2 upwarps along two ends, and lower edge is still horizontal linear, and the aperture of the long Y=100mm scope of lip 2 two ends side parts increases gradually with close to outer rim aperture.According to different film thickness requirement during salivation, select different salivation mouths.
In this routine hot-air oven, the side parts air outlet of the long 100mm scope of each plenum chamber top top cross increases gradually with close to sidewall, bore, make to increase gradually within the scope of the side parts 100mm of plenum chamber transverse direction, with close to plenum chamber inner side-wall air quantity, in this routine plenum chamber, the maximum hot blast blast of two side parts film surfaces is 2 times of the hot blast blast of middle part film surface.
This routine self-supporting Polyamic Acid Film is after steel band stripping, and above the side parts of film 100mm, be provided with heating tube carry out local heating, side parts film surface Heating temperature is 165 DEG C, and heat-up time is 65 seconds.
Same be the film of D=60 μm with uniform thickness is comparative example, and under the draw ratio that identical temperature is identical, carry out cross directional stretch with the film of the present embodiment process, the following process of longitudinal stretching and tensioning imidization tests, the two result is as shown in table 2:
The film of table 2 the present embodiment process and comparative example film following process situation comparison sheet
From the results shown in Table 2, the Polyamic Acid Film horizontal edge damage number of operation that draws in following process process adopting the side of the present embodiment to thicken is only 0.2% of traditional films.Vertical drawing also obviously is reduced with edge damage number of times in imidization operation, and the total disconnected film number of times on Production Line for Polyimide Film is tending towards 0, and product yield is tending towards 100.0%, and product yield is up to 98.0%.Preparation method's embodiment 2 of the Polyamic Acid Film that side thickeies
The forming mould of this routine polyamic acid solution salivation is extrusion die, its lip 2 front view as shown in Figure 3, regulate the bolt on edge and lower edge on extrusion die lip 2 two ends, make extrusion die lip 2 upwarps along two ends, lower curved under two ends, aperture W=0.262mm in the middle part of lip 2, lip 2 aperture of the long Y=100mm scope of lip 2 two ends side parts, to increase gradually with close to outer rim aperture, at lip 2 two ends, aperture is 0.574mm to the maximum, obtains the extrusion die of the salivation apparatus embodiments 2 of the Polyamic Acid Film that side thickeies.
Also the curve on the upper and lower edge of lip 2 can be selected through the extrusion die of special processing, and lip 2 upwarps along two ends, and lower curved under two ends, the aperture of the long Y=100mm scope of lip 2 two ends side parts increases gradually with close to outer rim aperture.According to different film thickness requirement during salivation, select different extrusion dies.
Other is identical with above-mentioned preparation method's embodiment 1 for the preparation method of this example.
Above-described embodiment, be only the specific case further described object of the present invention, technical scheme and beneficial effect, the present invention is not defined in this.All make within scope of disclosure of the present invention any amendment, equivalent replacement, improvement etc., be all included within protection scope of the present invention.
Claims (10)
1. a Polyamic Acid Film for side thickening, is characterized in that:
Increase gradually with close to outer edge thickness in the scope of the wide X of two side parts of described Polyamic Acid Film transverse direction, described X=20 ~ 200mm, central film portion thickness is H, and reinforcement thickness is h, the maximum value of h > H, h is (1.2 ~ 3) H.
2. the Polyamic Acid Film of side thickening according to claim 1, is characterized in that:
A and A ' point on described Polyamic Acid Film cross section bottom line is X with the distance of homonymy bottom line outer rim, and certain point on bottom line outside A is x with the distance of homonymy film outer rim, and the film thickness of this point is h, h=a
1(X-x)
n/ 10
9+ a
2(X-x)
n-1/ 10
7+ a
3(X-x)
n-2/ 10
5+ a
4(X-x)/10
3+ H, n are the integer of 2 ~ 4,1.5 > a
1> 0,1.0 > a
2>-1.0,1.0 > a
3>-1.0,0 > a
4>-1.0, film thickness distribution is symmetrical with film longitudinal cenlerline.
3. the Polyamic Acid Film of side thickening according to claim 1 and 2, is characterized in that:
Described X=60 ~ 120mm.
4. a salivation equipment for the Polyamic Acid Film of side thickening, comprises forming mould, and the circulation steel band of the shaping polyamic acid liquid film of carrying salivation and hot-air oven, is characterized in that:
The lip aperture of the long Y scope of described forming mould lip two side parts increases gradually with close to outer rim aperture, described Y=20 ~ 200mm, in the middle part of forming mould lip, aperture is W, within the scope of Y, forming mould lip aperture is w, the maximum value of w > W, w is (1.2 ~ 3) W.
5. the salivation equipment of the Polyamic Acid Film of side thickening according to claim 4, is characterized in that:
B and B ' point on straight line M vertical with steel band working direction in the plane in described lip right on is Y with the distance of homonymy lip outer end, between B and B ', lip aperture is W, certain point on lip medullary ray outside B is y with the distance of homonymy lip outer end, and the lip aperture of this point is w
W=b
1(Y-y)
n/ 10
9+ b
2(Y-y)
n-1/ 10
7+ b
3(Y-y)
n-2/ 10
5+ b
4(Y-y)/10
3+ W, n are the integer of 2 ~ 4,1.5 > b
1> 0,1.0 > b
2>-1.0,1.0 > b
3>-1.0,0 > b
4>-1.0, lip aperture is symmetrical with lip longitudinal cenlerline.
6. the salivation equipment of the Polyamic Acid Film that the side according to claim 4 or 5 thickeies, is characterized in that:
Described Y=60 ~ 120mm.
7. the preparation method of the Polyamic Acid Film of a side thickening, the polyamic acid solution of synthesis salivates through forming mould and is shaped to polyamic acid liquid film on steel band, and the steel band being loaded with polyamic acid liquid film becomes the Polyamic Acid Film of self-supporting through hot-air oven drying; It is characterized in that:
When polyamic acid solution salivates, be adjusted to mould lip bolt, the lip aperture of the long Y scope of described forming mould lip two side parts is increased gradually with close to outer rim aperture, described Y=20 ~ 200mm, in the middle part of forming mould lip, aperture is W, and within the scope of Y, forming mould lip aperture is w, w > W, the maximum value of w is (1.2 ~ 3) W, and the lip aperture of forming mould is symmetrical with lip longitudinal cenlerline.
8. the preparation method of the Polyamic Acid Film of side thickening according to claim 7, is characterized in that:
Be adjusted to along bolt on mould lip two ends, make the lip of the long Y scope of forming mould lip two ends side parts upwarps along outer end, lower edge is still horizontal linear; Or to be adjusted on mould lip two ends edge and lower to bolt, to make forming mould lip upwarps along two ends, lower curved under two ends.
9. the preparation method of the Polyamic Acid Film that the side according to claim 7 or 8 thickeies, is characterized in that:
Regulate the air outlet at each plenum chamber top in hot-air oven, the side parts air outlet being in the long Z scope of plenum chamber top cross is increased gradually with close to sidewall, bore, increase gradually within the scope of the side parts one fixed width of plenum chamber transverse direction, with close to plenum chamber inner side-wall air quantity, in plenum chamber, the hot blast blast of middle part film surface is F, the hot blast blast of two side parts film surfaces is f, the maximum value of f > F, f is (1.2 ~ 3) F.
10. the preparation method of the Polyamic Acid Film that the side according to claim 7 or 8 thickeies, is characterized in that:
Self-supporting Polyamic Acid Film is after steel band stripping, and the side parts within the scope of film X=20 ~ 200mm carries out local heating, and side parts film surface Heating temperature is 150 ~ 200 DEG C, and heat-up time is 8 seconds ~ 80 seconds.
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| CN105196578A (en) * | 2015-10-23 | 2015-12-30 | 上海洛兴包装材料有限公司 | Shrinkage sheet and manufacturing method thereof |
| CN113147012A (en) * | 2021-03-09 | 2021-07-23 | 复旦大学 | Polytetrafluoroethylene film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113147012A (en) * | 2021-03-09 | 2021-07-23 | 复旦大学 | Polytetrafluoroethylene film and preparation method thereof |
| CN113147012B (en) * | 2021-03-09 | 2022-09-02 | 复旦大学 | Polytetrafluoroethylene film and preparation method thereof |
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