CN104479156A - Polyamide acid film with reinforced sides as well as preparation method and facility thereof - Google Patents
Polyamide acid film with reinforced sides as well as preparation method and facility thereof Download PDFInfo
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- CN104479156A CN104479156A CN201410840109.6A CN201410840109A CN104479156A CN 104479156 A CN104479156 A CN 104479156A CN 201410840109 A CN201410840109 A CN 201410840109A CN 104479156 A CN104479156 A CN 104479156A
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Abstract
The invention relates to a polyamide acid film with reinforced sides as well as a preparation method and a facility thereof. The solvent content of the sides of the film is gradually reduced from the middle to outer edges and is symmetrical about a longitudinal center line of the film. The preparation method of the polyamide acid film comprises the steps that the nearer air outlets in sides of the top of a plenum chamber in an improved tap-casting hot-air oven get to an inner side wall of the plenum chamber, the larger the air volume of the air outlets is; the air pressure on the surface of the film is symmetrical about a longitudinal center plane of the plenum chamber; the sides of the polyamide acid film peeled from a steel belt are partly heated; the nearer the air outlets in the sides of the top of the plenum chamber in the hot-air oven in the facility get to the inner side wall of the plenum chamber, the apertures of the air outlets are larger, and the apertures of the air outlets are symmetric about the longitudinal center plane of the plenum chamber; heating tubes are installed above and/or below the sides of the polyamide acid film in the advancing process of the polyamide acid film peeled from the steel belt, and the installation height of the polyamide acid film is symmetric about a vertical plane on a longitudinal center line of the film; the solvent content of the two sides of the film is reduced, the strength of the sides of the film is improved, the polyamide acid film is unlikely to be clamped and pulled broken, and the film yield is increased. The method and facility only need to be partly improved and are easy to use.
Description
Technical field
The present invention relates to Kapton manufacturing technology, be specially Polyamic Acid Film, its preparation method and facility that a kind of side is strengthened.
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 manufacturing process 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.
Along with downstream application product is light, thin, short, little and High Reliability Design requirement, the film thickness specification of the market requirement is tending towards slimming, to its manufacturing technology, quality product particularly product yield all have higher requirement.
In Kapton manufacturing processed, 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 thin film 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 product yield.
On 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 manufacturing processed, 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 this invention is to provide the Polyamic Acid Film that a kind of side is strengthened, reduce gradually with close to outer rim solvent within the scope of the horizontal two side parts one fixed widthes of film, because its intensity of minimizing of side parts film internal solvent content increases, not easily 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 to provide the preparation method of the Polyamic Acid Film that a kind of side is strengthened, change one or more plenum chamber top sides side part air outlets in hot-air oven, make to increase gradually within the scope of the side parts one fixed width of one or more plenum chamber transverse directions, with close to plenum chamber inner side-wall air quantity, the steam output of film side parts solvent is increased, to reduce the solvent of film side parts thus to improve intensity.
Another object of the present invention be the Polyamic Acid Film strengthened of a kind of side of design prepare facility, in the hot-air oven configured, the air outlet of one or more plenum chamber top side parts strengthens with close to plenum chamber inner side-wall, bore, gradually to provide stronger hot blast.
The Polyamic Acid Film that a kind of side provided by the invention is strengthened, reduces with close to outer rim solvent in the scope of the wide X of horizontal two side parts of film, described X=20 ~ 200mm gradually.Central film portion solvent is Q, and side parts solvent is q, q < Q, and film outer rim solvent q is minimum, be (0.2 ~ 0.6) Q.The solvent distribution of film is symmetrical with film longitudinal cenlerline.
The Polyamic Acid Film preparation method that a kind of side provided by the invention is strengthened, 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.Change plenum chamber top sides side part air outlet in salivation hot-air oven, make to increase gradually within the scope of the side parts width Y of plenum chamber transverse direction, with close to plenum chamber inner side-wall air quantity, described Y=20 ~ 200mm.In the middle part of plenum chamber, the blast of film surface is F, is f, f > F at the blast of plenum chamber side parts film surface, and the Pressures f of film outer rim is maximum, be (1.2 ~ 3) F.The wind force distribution of film surface is symmetrical with plenum chamber longitudinal median plane.
For improving Polyamic Acid Film dual-side intensity further, self-supporting Polyamic Acid Film is after steel band stripping, before entering transverse stretching machine, local heating is carried out in the scope of film side parts 20 ~ 200mm, 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.
The Polyamic Acid Film that a kind of side of the present invention's design is strengthened prepare facility, comprise forming mould, the circulation steel band of the shaping polyamic acid liquid film of carrying salivation, there is the hot-air oven of multiple plenum chamber, many thermal wind exhaustings air outlet is arranged at one or more plenum chamber tops, the medullary ray in each discharge air port is vertical with plenum chamber longitudinal cenlerline, and the air outlet bore within the scope of plenum chamber side parts width Y of the present invention increases gradually with close to plenum chamber inner side-wall, described Y=20 ~ 200mm.Middle part air outlet bore is W, and within the scope of Y, air outlet bore is w, w > W, and the air outlet bore w near plenum chamber inner side-wall is maximum, be (1.2 ~ 3) W.Plenum chamber top hot blast air outlet bore is symmetrical with plenum chamber longitudinal median plane.
Polyamic Acid Film peels off rear film from steel band, before entering transverse stretching machine, in film traveling process its laterally within the scope of wide Z the top of side parts and/or below heating tube is installed, described Z=20 ~ 200mm, the heating tube that laterally equidistantly arrangement 2 ~ 6 row length directions are parallel with film direct of travel within the scope of wide Z, the length L=u*t that heating tube arranges, wherein u represents film gait of march, t represents the film treatment time, and 0.5m/min≤u≤20.0m/min, 8 seconds≤t≤80 second.Heating tube and film surface vertical range are m, reduce gradually with close to film outer rim m.Above film outer rim and/or the heating tube of below and film surface apart from minimum be M, M be 10 ~ 30mm, m=(1 ~ 8) M.Reduce gradually with the spacing close to film outer rim heating tube and film at the side parts of the wide Z of film, side parts film surface Heating temperature is improved gradually, is 150 ~ 200 DEG C.Above film two side parts and/or the mounting height of below heating tube with the vertical plane symmetry on film longitudinal cenlerline.
Compared with prior art, the advantage of Polyamic Acid Film, its preparation method and facility that a kind of side of the present invention is strengthened is: 1, the solvent of Polyamic Acid Film two side parts reduces, make it intensity to increase, 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 not easily occurs, by testing, the situation of edge damage, disconnected film seldom occurs, and film product yield improves greatly; 2, this preparation method is easy to realize, only need change the hot blast air outlet bore of hot-air oven plenum chamber side parts, can strengthen side parts air output, the solvent evaporation amount of polyamic acid salivation liquid film side parts increases, reduces the solvent of side parts film; 3, the increasing of hot blast air outlet bore of hot-air oven plenum chamber side parts and the installation of heating tube are only local flow improvement, easy to implement.
Accompanying drawing explanation
Fig. 1 be this side strengthen Polyamic Acid Film embodiment film cross section on solvent scatter chart.
Fig. 2 is that air port schematic diagram is discharged at certain the plenum chamber top one of the hot-air oven preparing facility embodiment 1 of the Polyamic Acid Film that this side is strengthened.
Fig. 3 be the Polyamic Acid Film strengthened of this side prepare facility embodiment 1 self-supporting Polyamic Acid Film from local heating pipe schematic diagram above the film side parts after steel band is peeled off in traveling process.
Fig. 4 is the cross-sectional view of certain avris of Fig. 3.
Fig. 5 is certain the plenum chamber top outlet inlet schematic diagram of the hot-air oven preparing facility embodiment 2 of the Polyamic Acid Film that this side is strengthened.
Number in the figure is: 1, film, 2, plenum chamber top, 3, air outlet, 4, heating tube.
Embodiment
The Polyamic Acid Film embodiment that side is strengthened
The Polyamic Acid Film embodiment that this side is strengthened, reduce gradually with close to outer rim solvent in two side parts of film 1 transverse direction, the scope of wide X=100mm, solvent Q=35% in the middle part of film 1, film 1 outer rim solvent is minimum is 16%, and on film 1 cross section, solvent distribution as shown in Figure 1.
The change of film 1 solvent is symmetrical with film longitudinal cenlerline.
With solvent evenly for the film of Q=35% is for comparative example, under the draw ratio that identical temperature is identical, carry out cross directional stretch with the present embodiment film, 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 strengthen 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 99.0%.
Side strengthen Polyamic Acid Film prepare facility embodiment 1
This side strengthen Polyamic Acid Film prepare facility embodiment, comprise forming mould, the circulation steel band of the shaping polyamic acid liquid film of carrying salivation, there is the hot-air oven of multiple plenum chamber, there is many thermal wind exhaustings air outlet 3 on 2, one or more plenum chamber tops, certain thermal wind exhausting air outlet 3 on 2, certain plenum chamber top as shown in Figure 2, the medullary ray in one discharge air port 3 is vertical with plenum chamber longitudinal cenlerline, 3 air outlets 3 within the scope of this routine plenum chamber partial width Y=100mm are interconnected and become elongated hole, increase gradually with close to this elongated hole bore of plenum chamber inner side-wall.Air outlet 3 bore W=8.0mm in the middle part of this row, within the scope of Y, air outlet 3 bore is w, maximum near the air outlet 3 bore w of plenum chamber inner side-wall, be 2W.2, plenum chamber top hot blast air outlet bore is symmetrical with plenum chamber longitudinal median plane.
Polyamic Acid Film 1 is after steel band stripping, before entering transverse stretching machine, above side parts, heating tube 4 is installed within the scope of its horizontal wide Z=100mm in film 1 traveling process, as shown in Figure 3, the heating tube 4 that laterally equidistantly arrangement 4 row length directions are parallel with film 1 direct of travel within the scope of wide 100mm, the length L=u*t that this routine heating tube 4 arranges, wherein u represents film 1 gait of march, this routine u=6.0m/min, t represent film 1 treatment time, this routine t=45 second; L=4.5m.As shown in Figure 4, the heating tube of this example above film 1 outer rim 4 and the minimum M=20mm of the surperficial vertical range of film 1, strengthening gradually with leaving film 1 outer rim m, is 55.26mm with the top heating tube 4 at film 1 outer rim horizontal throw 100mm place and the vertical range on film 1 surface.Heating tube 4 above side parts makes the temperature of film 1 side-flank surfaces, improves gradually with close to film 1 outer rim, and this routine film 1 outer fringe surface temperature reaches 180 DEG C.
Facility embodiment 2 prepared by the Polyamic Acid Film that side is strengthened
The air outlet 3 on 2, the plenum chamber top of this example is slightly different, other structure and the Polyamic Acid Film that side is strengthened to prepare facility embodiment 1 identical.As shown in Figure 5, air outlet 3 is many slits crossing 2, plenum chamber top, vertical with plenum chamber longitudinal cenlerline.Stitch wide for the wide w that expands as of W=8.0mm, two avris long Y=100mm scope inseam in the middle part of each bar air outlet 3 slit, outer end stitch wide w maximum, be 16mm.2, plenum chamber top each bar air outlet 3 slit seam is wide symmetrical with plenum chamber longitudinal median plane.
The Polyamic Acid Film preparation method embodiment that side is strengthened
The use of this example prepares facility embodiment 1 with the Polyamic Acid Film of upper side edge reinforcement.
The polyamic acid solution of synthesis 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 1 of self-supporting through hot-air oven drying, within the scope of the wide 100mm of side parts of plenum chamber transverse direction, increase gradually with close to plenum chamber inner side-wall air quantity.In the middle part of plenum chamber, the blast on film 1 surface is F, and within the scope of the wide 100mm of plenum chamber side parts, the blast on film 1 surface is f, and film 1 outer fringe surface blast f is maximum, be 2F.Film 1 Pressures is symmetrical with plenum chamber longitudinal median plane.
The self-supporting Polyamic Acid Film that this example is peeled off from steel band is before entering transverse stretching machine, in traveling process, film 1 side parts is carried out local heat treatment by the heating tube installed above it, this routine film 1 outer fringe surface Heating temperature reaches 180 DEG C, drops to room temperature gradually by edge inside film 1 surface temperature.The side parts local heating time is 60 seconds.Content reduces further, imines rate improves because solvent partly evaporates again to pass through film 1 side parts heated, and its intensity is strengthened.Above film 1 liang of side parts, the mounting height of heating tube is with the vertical plane symmetry on film 1 longitudinal cenlerline.
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 (9)
1. a Polyamic Acid Film for side reinforcement, is characterized in that:
Reduce gradually with close to outer rim solvent in the scope of the wide X of horizontal two side parts of described film, described X=20 ~ 200mm, central film portion solvent is Q, side parts solvent is q, q < Q, film outer rim solvent q be minimum, be (0.2 ~ 0.6) Q.
2. the Polyamic Acid Film of side reinforcement according to claim 1, is characterized in that:
The solvent distribution of described film is symmetrical with film longitudinal cenlerline.
3. a preparation method for the Polyamic Acid Film of side reinforcement, the polyamic acid solution of synthesis salivates into polyamic acid liquid film through forming mould 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:
Change the air outlet of plenum chamber top side parts in salivation hot-air oven, make to increase gradually within the scope of the side parts width Y of plenum chamber transverse direction, with close to plenum chamber inner side-wall air quantity, described Y=20 ~ 200mm, in the middle part of plenum chamber, the blast of film surface is F, be f at the blast of plenum chamber side parts film surface, f > F, film outer fringe surface blast f be maximum, be (1.2 ~ 3) F.
4. the preparation method of the Polyamic Acid Film of side reinforcement according to claim 3, is characterized in that:
In salivation hot-air oven, the wind force distribution of film surface is symmetrical with plenum chamber longitudinal median plane.
5. the preparation method of the Polyamic Acid Film of side reinforcement according to claim 4, is characterized in that:
Described self-supporting Polyamic Acid Film is after steel band stripping, and before entering transverse stretching machine, carry out local heating in the scope of film side parts 20 ~ 200mm, side parts film surface Heating temperature is 150 ~ 200 DEG C, and heat-up time is 8 seconds ~ 80 seconds.
6. the Polyamic Acid Film strengthened of a side prepare facility, comprise forming mould, the circulation steel band of the shaping polyamic acid liquid film of carrying salivation, there is the hot-air oven of multiple plenum chamber, many thermal wind exhaustings air outlet is arranged at one or more plenum chamber tops, the medullary ray in each discharge air port is vertical with plenum chamber longitudinal cenlerline, it is characterized in that:
Air outlet (3) bore within the scope of the side parts width Y in described plenum chamber top (2) portion increases gradually with close to plenum chamber inner side-wall, described Y=20 ~ 200mm, middle part air outlet (3) bore is W, within the scope of Y, air outlet (3) bore is w, w > W, maximum near air outlet (3) the bore w of plenum chamber inner side-wall, be (1.2 ~ 3) W.
7. the Polyamic Acid Film strengthened of side according to claim 6 prepare facility, it is characterized in that:
Plenum chamber top (2) portion hot blast air outlet (3) bore is symmetrical with plenum chamber longitudinal median plane.
8. the Polyamic Acid Film strengthened of side according to claim 6 prepare facility, it is characterized in that:
Polyamic Acid Film (1) is after steel band stripping, before entering transverse stretching machine, in film (1) traveling process, within the scope of its horizontal wide Z, heating tube (4) is installed in above side parts and/or below, described Z=20 ~ 200mm, the heating tube (4) that laterally equidistantly arrangement 2 ~ 6 row length directions are parallel with film (1) direct of travel within the scope of wide Z, the length L=u*t that heating tube (4) arranges, wherein u represents film (1) gait of march, t represents film (1) treatment time, and 0.5m/min≤u≤20.0m/min, 8 seconds≤t≤80 second, heating tube (4) and film (1) surface distance are m, reduce gradually with close to film (1) outer rim m, above film (1) outer rim and/or the heating tube (4) of below and film (1) surface distance minimum be M, M is 10 ~ 30mm, m=(1 ~ 8) M.
9. the Polyamic Acid Film strengthened of side according to claim 8 prepare facility, it is characterized in that:
Above film (1) two side parts and/or the mounting height of below heating tube (4) with the vertical plane symmetry on film (1) longitudinal cenlerline.
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Cited By (3)
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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 |
| CN111113754A (en) * | 2019-11-22 | 2020-05-08 | 桂林电器科学研究院有限公司 | Method for improving edge strength of polyamide acid film |
| CN112999979A (en) * | 2021-02-04 | 2021-06-22 | 江苏亚宝绝缘材料股份有限公司 | Automatic production line and automatic production method of polyimide film |
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| Publication number | Publication date |
|---|---|
| CN104479156B (en) | 2017-08-11 |
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