JP3577967B2 - Resin film manufacturing equipment - Google Patents

Description

【００４９】
表１から明らかなように、気体吸引管３１、３２を付加することで、さらに製膜速度を向上できることが判る。製膜速度は、通常高速になるとフィルムにエアを噛み込み、フィルム破れにつながる。したがって可能な製膜速度の上限がその装置の能力を示すパラメータとなる。
【００５０】
【発明の効果】
以上説明したように、本発明によれば、フィルム端部に対し気体噴出管を設けたことによりエア噛みを抑制でき、製膜を安定化させるとともにフィルムの品質を向上でき、しかも製膜速度を向上して生産性を向上できる。
【００５１】
また、さらに気体吸引管を併せて設けることにより、一層の製膜の安定化、品質の向上、製膜速度の向上を達成できる。
【図面の簡単な説明】
【図１】本発明の一実施態様に係る樹脂フィルムの製造装置の概略斜視図である。
【図２】図１の装置の側面図である。
【図３】図１の装置の下面図である。
【図４】図１の装置の拡大部分側面図である。
【図５】図１の装置における条件不適合の場合を示す部分斜視図である。
【図６】本発明の別の実施態様に係る樹脂フィルムの製造装置の概略斜視図である。
【図７】図６の装置の拡大部分斜視図である。
【符号の説明】
１ 口金装置
２ フィルム吸引装置（吸引ノズル）
３ フィルム
４ ベルト（キャスト装置）
４ａ キャスト面
５、６ 気体噴出管
７、８ エア配管
９、１０ 絞り弁
１１、１２ 吸引配管
１３、１４ 絞り弁
１５、１６ ブロワ（真空源）
１７ キャスト面移動方向
１８、１９ 調整装置（移動手段）
２０ 前部吸引口
２１ 後部吸引口
３１、３２ 気体吸引管
３３、３４ 吸引配管
３５、３６ ブロワ
３７、３８ 絞り弁[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for manufacturing a resin film, and more particularly to an apparatus for manufacturing a resin film suitable for an apparatus for forming a film by discharging a molten resin or a resin having fluidity dissolved in a solvent from a slit gap of a die. .
[0002]
[Prior art]
BACKGROUND ART Conventionally, there has been known a manufacturing method in which a molten resin or a solution resin is extruded into a film shape from a slit-shaped die and adhered to a cast surface, and then cooled or dried to form a resin film. In such a resin film manufacturing method, whether or not the point of adhesion of the film discharged from the die to the cast surface is stable has a fundamental effect on the subsequent processes and is an important factor that affects product quality. It is a factor.
[0003]
That is, if the contact point is unstable, a phenomenon occurs in which air is caught between the film and the casting surface from a point where the contact point is most delayed (hereinafter, this is referred to as "air biting"). When this air biting occurs, there have been problems such as uneven thickness on the film surface and stress concentration at the air biting portion in the subsequent stretching process to break the film. This air biting phenomenon becomes more remarkable as the film forming speed increases, which hinders improvement in productivity.
[0004]
Heretofore, as a countermeasure against the air biting, there have been proposed several close contact methods such as utilizing electrostatic force, forcibly pressing with air, or suctioning air with a suction nozzle. However, of these contact methods, the forced pressing method using air disturbs the film on the cast surface due to blowing excessive air, especially when the cast surface becomes high speed or the film becomes thin, the contact point becomes unstable. Disadvantage.
[0005]
In addition, in the adhesion method using electrostatic force, if the electrostatic force is increased as the casting surface speeds up, the adhesion point becomes unstable due to the discharge phenomenon on the metal casting surface. It has the disadvantage of being limited. In addition, the method using static electricity has an essential problem that it is difficult to obtain a sufficient effect when the resin to be formed is a non-conductor.
[0006]
On the other hand, the suction method using a suction nozzle has advantages that it does not require an excessive supply of air and can be applied even when the resin is non-conductive, and is widely used. However, when a suction nozzle is used, the suction force also sucks air from both ends of the film, so that the amount of air flowing between the film and the cast surface increases. The air that has flowed in from the end of the film causes the liquid film to be disturbed particularly at both ends of the film in the form of a liquid film, leading to the occurrence of an air biting phenomenon unique to the end of the film.
[0007]
[Problems to be solved by the invention]
The object of the present invention is to prevent the inflow of air from both ends of the film into the space between the film and the cast surface when the film is brought into close contact with the cast surface by using the suction nozzle, thereby enabling high-quality products and high-speed film formation. It is an object of the present invention to provide a simple resin film manufacturing apparatus.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a resin film manufacturing apparatus of the present invention includes a die device for discharging a resin having fluidity into a film shape, and a cast in which a film discharged from the die device is placed and continuously moved. In a resin film manufacturing apparatus having a casting device having a surface, and a film suction device for bringing a film placed on the casting surface into close contact with the casting surface, the width direction end of the film discharged from the die device upward, Rutotomoni provided a single or a plurality of gas ejection means for ejecting a gas toward the film, in the vicinity of the gas ejection means, provided a gas suction means for sucking the gas ejected from the gas ejection means it consists those characterized by the.
[0009]
In the resin film manufacturing apparatus, it is preferable that the gas blown from the gas blowing means has a wind speed of 5 m / sec or more and 100 m / sec or less.
[0010]
In addition, it is preferable that a moving means capable of arbitrarily moving the gas ejecting means in a uniaxial direction or a multiaxial direction is provided in the vicinity of an end portion of the film in the width direction of the film. This makes it possible to adjust the gas blowing position and direction.
[0011]
In addition, when the gas ejection means is provided, there is a possibility that the ejected gas may flow between the film and the casting surface from the edge of the film. To prevent this, in the present invention, in the vicinity of the gas ejection means, our Ku provided local gas suction means for sucking the gas ejected from the gas ejection means. The gas suction means is preferably provided on the side of the edge of the film, particularly on the side of both edges.
[0012]
The film suction device sucks air from the opposite side of the direction of movement of the casting surface to the liquid film-like film discharged from the die device to the casting surface, and as much as possible between the landing film and the casting surface. This is a device for adhering a film to a cast surface without air being caught.
[0013]
Although the structure of the film suction device is not particularly limited, it is preferable that the film suction device has a suction port opened toward the film located between the die device and the casting surface until landing.
[0014]
Further, the film suction device may have a structure having a plurality of suction ports and a plurality of suction means, and a suction nozzle provided so that at least one of the suction ports is in contact with the film to form a negative pressure region. You can also. In this structure, it is preferable to provide suction means such as a suction pipe and a blower for each suction port.
[0015]
The casting surface is formed, for example, by a rotating endless belt. Such a casting apparatus using an endless belt is particularly suitable for forming a solution. When the film is a solution film, the temperature of the endless belt is preferably 50 ° C. or higher. In the case of solution film formation using a solvent, the solvent is easily removed by setting the belt temperature as described above.
[0016]
In the resin film manufacturing apparatus according to the present invention as described above, the liquid film-like film discharged from the die device is adhered to the casting surface by the film suction device, at this time, by suction by the device, Excess air tends to flow between the film and the cast surface from both ends of the film. However, in the present invention, the gas ejecting means for ejecting gas at high speed from above the film is provided at the film end, so that the ejected gas forms a flow that escapes at least from the film end to the side. . This gas flow prevents the excess air from flowing in and appropriately removes the incoming air. At the same time, the ejected gas presses the edge of the film toward the cast surface, so that the shape at the time of landing at the edge of the film is deformed so as to reduce the gap between the film and the cast surface. The inflow of air from is suppressed. As a result, the amount of air flowing in from the edge of the film is reduced, and undesirable air biting at the edge of the film is prevented.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
First, the resin, which is a raw material of a film manufactured using the resin film manufacturing apparatus of the present invention, is not particularly limited as long as it can be melted or has fluidity as a solution and can be formed into a film. Examples thereof include thermoplastic resins represented by polyolefins such as polypropylene and polyethylene, polyesters such as polyethylene terephthalate, and heat-resistant resins such as meta-aramids and para-aramids. Needless to say, the resin used may contain additives such as a stabilizer and an antistatic agent.
[0018]
FIG. 1 is a perspective view schematically showing an apparatus for manufacturing a resin film according to one embodiment of the present invention, and particularly a perspective view for explaining a configuration provided with gas ejection means for ejecting gas toward the film. It is. FIG. 2 is a side view of the device shown in FIG. 1, and FIG. 3 is a bottom view of the device shown in FIG.
[0019]
1, 2 and 3, an extruder (not shown), which is a resin supply source, is connected to a die device 1 that continuously discharges a fluid resin in a film shape. A slit (not shown) for discharging resin in a film shape is provided at a lower end of the base device 1, and side plates 1 a and 1 b capable of adjusting and regulating the length of the slit are provided at both ends in the longitudinal direction of the slit. Are provided respectively.
[0020]
An orbiting endless belt 4 constituting the casting device is provided below the die device 1, and its outer surface is a casting surface 4a. In this embodiment, the endless belt 4 is installed so that the casting surface 4a of the portion facing the die device 1 is in the horizontal direction, and the endless belt 4 moves in the horizontal direction in the direction indicated by the arrow 17. I do. Further, in this embodiment, the casting surface 4a is formed by the endless belt 4, but the casting surface 4a may be formed on the outer surface of the rotary casting drum.
[0021]
On the other hand, a suction nozzle 2 as a film suction device is provided near the slit of the die device 1 and the casting surface 4a. The suction nozzle 2 has a suction port opened in a space between the slit of the die device 1 and the casting surface 4a, and mainly sucks the air in this space to transfer the film 3 discharged from the slit to the casting surface 4a. Has the effect of making it adhere to Suction pipes 11 and 12 are connected to the suction nozzle 2, and blowers 15 and 16 are connected to the respective suction pipes 11 and 12. Throttle valves 13 and 14 are connected to the suction pipes 11 and 12 so that the suction flow rate and suction pressure can be adjusted.
[0022]
The molten resin or solution resin supplied from the extruder is discharged downward from the slit of the die device 1 to form a film 3 and flows down so as to be placed on the casting surface 4 a moving in the direction of arrow 17. I do. The degree of close contact of the film 3 with the casting surface 4a is determined by the fact that the suction nozzle 2 arranged upstream (in the opposite direction of the arrow 17) from the point where the film 3 contacts the casting surface 4a (the opposite side of the arrow 17) sucks air. Is controlled by the suction pressure (negative pressure) generated by the pressure.
[0023]
The apparatus for manufacturing a resin film described above in this embodiment is a known apparatus per se.
[0024]
The features of the resin film manufacturing apparatus of the present invention are as follows.
At the front part (downstream side in the film discharge direction) of the base device 1, gas ejection pipes 5, 6 as gas ejection means for ejecting gas to the width direction end of the film 3 made of the cast liquid film are attached. Have been. Gas pipes 7 and 8 are connected to the gas ejection pipes 5 and 6, and the flow rate and the wind velocity of the gas blown out by the throttle valves 9 and 10 can be adjusted. Adjusting devices 18 and 19 are attached to the gas ejection pipes 5 and 6 as moving means that can move in at least one axis direction, in this embodiment, multi-axis directions so that the gas ejection direction and the gas ejection position can be adjusted. I have. The cross-sectional shape of the gas ejection pipes 5 and 6 is preferably circular or rectangular, and the inner diameter is preferably 1 to 10 mm.
[0025]
In the present invention, the gas is blown to the widthwise end of the film 3 made of the cast liquid film, and the widthwise end of the gas to blow the gas of the present invention is preferably 100 mm from the edge of the cast film. , And more preferably, the edge portion of the liquid film, particularly, a portion within 5 mm from the edge.
[0026]
In the present invention, the type of gas to be blown is not particularly limited, but is preferably dry air, nitrogen, or the like, and is preferably a clean gas that has passed through a filter in order to prevent foreign substances from being mixed into the film.
[0027]
In the present invention, the strength of the blown gas is preferably about 5 to 100 m / sec as the wind speed.
[0028]
In the above, the embodiment of the resin film manufacturing apparatus of the present invention including the gas ejection pipes 5 and 6 as the gas ejection means has been described. The nozzle 2 may be used, or a support stand (not shown) of the base device may be used. In short, it is only necessary that gas can be blown to both ends of the liquid film by a gas blowing means that can adjust the direction and the flow rate.
[0029]
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
[0030]
Example 1
In N-methyl-2-pyrrolidone (NMP), 2-chloroparaphenylenediamine corresponding to 80 mol% as an aromatic diamine component and 4,4′-diaminodiphenyl ether corresponding to 20 mol% are dissolved. Was added to the mixture, and the mixture was stirred for 2 hours to complete the polymerization. This was neutralized with lithium hydroxide to obtain an aromatic polyamide solution having a polymer concentration of 11% by weight and a viscosity of 2000 poise. This solution was continuously discharged in the form of a film at a rate of 2 kg / min by a die device 1 having a discharge slit having a width of 2 m to produce a film 3.
[0031]
As the suction nozzle, a box-type suction device 2 having two suction ports, a front suction port 20 and a rear suction port 21, shown in FIG. 3 was used. The front suction port 20 formed a negative pressure area at a position in contact with the film 3. The detailed dimensions are as follows. The A dimension of the front suction port 20 was 100 mm. The rear suction port 21 is provided so as to surround the front suction port 20 except for a portion located on the film 3 side of the front suction port 20. The C size of the rear suction port 21 was 80 mm, the F size was 20 mm, the B size and the D size were 60 mm, respectively, and the E size and the G size were 25 mm, respectively. The discharged film 3 was brought into close contact with the endless belt 4 (cast surface 4 a) moving in the direction of arrow 17 at a surface temperature of 90 ° C. by the suction device 2. Then, after drying with hot air, stretching and washing in a water washing step (not shown), stretching and heat treatment in a heat treatment step (not shown), a polyamide film having a winding thickness of 6 μm was obtained.
[0032]
The gas ejection pipes 5 and 6 and the adjusting devices 18 and 19 constituting the gas ejection means shown in FIG. 1 are installed on the front surface of the base device 1, and these gas ejection devices are connected to a compressed air source (not shown) by an air pipe 7. , 8 and throttle valves 9, 10.
[0033]
When the distance (X distance) between the die 1 and the casting surface 4a of the belt 4 (to the casting surface) is 3 mm and the moving speed of the belt 4 is 5 m / min, the desired distance between the film 3 and the casting surface 4a is obtained. Adhesion started, and thereafter, the belt moving speed was increased while increasing the degree of vacuum in the front suction port 20 and the rear suction port 21. Dry 5 mm inside from the edge of the cast film and 2 mm in front of the landing line of the film on the cast surface with a pipe (gas ejection tube 5, 6) having an inner diameter of 2 mm from 10 mm above the cast surface. Air was blown at a wind speed of 20 m / sec.
[0034]
When the belt moving speed reached 22 m / min, the degree of vacuum at the front suction port 20 was 100 mmAq, and the degree of vacuum at the rear suction port 21 was 110 mmAq, a stable film was formed without air biting.
[0035]
Comparative Example 1
The film 3 extruded under the same conditions as in Example 1 was adhered to the cast surface 4a by the suction device 2 having the same dimensions as in Example 1 to form a film. The gas ejection device was installed in the same place as in Example 1, but gas was not sprayed.
[0036]
When the moving speed of the belt 4 is set to 5 m / min, the desired close contact between the film 3 and the casting surface 4a starts, and thereafter, the belt moving speed is increased while increasing the degree of vacuum of the front suction port 20 and the rear suction port 21. Was increased. When the belt moving speed was 13 m / min, the degree of vacuum at the front suction port 20 was 100 mmAq, and the degree of vacuum at the rear suction port 21 was 110 mmAq, stable film formation without air biting occurred. When it was raised by an amount, air biting occurred. Although the degree of vacuum at the front suction port 20 was increased to 150 mmAq and the degree of vacuum at the rear suction port 21 was increased to 170 mmAq, air biting could not be suppressed.
[0037]
Comparative Example 2
The film 3 extruded under the same conditions as in Example 1 was adhered to the cast surface 4a by the suction device 2 having the same dimensions as in Example 1 to form a film. The gas ejection device was installed in the same place as in Example 1, and the air velocity of the blown air was set to the same condition as in Example 1. However, suction by the suction device 2 was not performed.
[0038]
When the moving speed of the belt 4 was set to 2 m / min, desired contact between the film 3 and the casting surface 4a was started, and thereafter, the speed was increased by 0.5 m / min. When the belt moving speed was 7 m / min, air biting occurred, and the wind speed of the air blown from the gas ejection device was increased to 30 m / min, but the occurrence of air biting could not be suppressed.
[0039]
Comparative Example 3
The film 3 extruded under the same conditions as in Example 1 was adhered to the cast surface 4a by the suction device 2 having the same dimensions as in Example 1 to form a film. The gas ejection device was installed in the same place as in Example 1. However, no gas was blown, and no suction by the suction device 2 was performed.
[0040]
The desired close contact between the film 3 and the casting surface 4a was started at the time when the moving speed of the belt 4 was 2 m / min, and thereafter, the speed was increased by 0.3 m / min. Air biting occurred at a belt moving speed of 3.3 m / min.
[0041]
As described above, according to the embodiment of the present invention, in the apparatus for manufacturing a resin film, gas ejecting means is provided, and gas is ejected from the gas ejecting means to both ends in the width direction of the film formed of the liquid film to be cast. By spraying, the occurrence of air biting on the film surface could be suppressed. As a result, since the film formation is stabilized, the film is not broken by the subsequent stretching step, and the productivity can be improved.
[0042]
As described above, the suppression of the air biting is achieved by preventing the inflow air by forming a flow in which the jetting gas from the gas jetting means escapes to the outside of the end of the film, and as shown in FIG. The end of the film 3 is deformed by the jetting gas from the jetting means 5 (6), and the gap between the end of the film 3 to be landed and the casting surface 4a is suppressed small, so that the amount of inflowing air is suppressed. This is due to both.
[0043]
In the above embodiment, the gas ejection pipes 5 and 6 are provided as the gas ejection means. However, if the conditions are not satisfied, for example, if the directions and the wind speeds of the gas ejection pipes 5 and 6 are not appropriate, the ejected gas is As shown in FIG. 5, there is a possibility that the film 3 may go between the film 3 and the casting surface 4a from the end.
[0044]
The present invention also provides a configuration for eliminating such a risk, together with the above-described gas ejection means .
[0045]
FIG. 6 shows an apparatus for manufacturing a resin film according to another embodiment of the present invention. In particular, as a configuration for eliminating the above-mentioned fear, gas suction for sucking gas ejected from gas ejection means is provided. 2 shows an apparatus for manufacturing a resin film having a configuration provided with means. In this embodiment, in addition to the configuration of the embodiment shown in FIG. 1, a gas suction pipe as a gas suction means for sucking the gas jetted from the gas jet pipes 5, 6 is provided near the gas jet pipes 5, 6. 31 and 32 are provided. Suction pipes 33 and 34 are connected to the gas suction pipes 31 and 32, and are suctioned by blowers 35 and 36 as vacuum sources, and the suction amount can be adjusted by throttle valves 37 and 38.
[0046]
With this configuration, the gas ejected from the gas ejection pipe 5 (6) is locally sucked into the gas suction pipes 31 (32) without flowing to the back of the film 3 as shown in FIG. Can be done. That is, it is possible to rectify the flow from the gas ejection pipe 5 in a desired direction and to prevent the gas from flowing around without generating excess gas. As a result, the risk of inconvenience as shown in FIG. 5 can be eliminated, and more stable high-speed film formation can be achieved.
[0047]
Examples 2, 3 and Comparative Example 4
Table 1 shows the results of comparing the case where the gas suction pipes 31 and 32 were attached (Examples 2 and 3) and the case where the gas suction pipes 31 and 32 were not attached (Comparative Example 4) under the same film forming conditions as in Example 1 described above. Show. It should be noted that Comparative Example 4 and Example 1 described above are substantially equivalent.
[0048]
[Table 1]

[0049]
As is clear from Table 1, it is understood that the film forming speed can be further improved by adding the gas suction pipes 31, 32. When the film forming speed is usually high, air is caught in the film, which leads to film breakage. Therefore, the upper limit of the possible film forming speed is a parameter indicating the capability of the apparatus.
[0050]
【The invention's effect】
As described above, according to the present invention, by providing the gas ejection pipe at the end of the film, air biting can be suppressed, the film formation can be stabilized and the quality of the film can be improved, and the film formation speed can be reduced. Can improve the productivity.
[0051]
Further, by further providing a gas suction pipe, it is possible to further stabilize film formation, improve quality, and improve film formation speed.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an apparatus for manufacturing a resin film according to an embodiment of the present invention.
FIG. 2 is a side view of the apparatus of FIG.
FIG. 3 is a bottom view of the apparatus of FIG. 1;
FIG. 4 is an enlarged partial side view of the device of FIG. 1;
FIG. 5 is a partial perspective view showing a case where conditions are not satisfied in the apparatus of FIG. 1;
FIG. 6 is a schematic perspective view of an apparatus for manufacturing a resin film according to another embodiment of the present invention.
FIG. 7 is an enlarged partial perspective view of the device of FIG. 6;
[Explanation of symbols]
1. Cap unit 2 Film suction device (suction nozzle)
3 Film 4 belt (casting device)
4a Cast surface 5, 6 Gas ejection pipe 7, 8 Air pipe 9, 10 Throttle valve 11, 12 Suction pipe 13, 14 Throttle valve 15, 16 Blower (vacuum source)
17 Cast surface moving direction 18, 19 Adjusting device (moving means)
20 front suction port 21 rear suction port 31, 32 gas suction pipe 33, 34 suction pipe 35, 36 blower 37, 38 throttle valve

Claims (8)

A die device for discharging a resin having fluidity into a film form, a cast device having a cast surface on which a film discharged from the die device is placed and continuously moved, and a film placed on the cast surface. In a resin film manufacturing apparatus having a film suction device that is in close contact with the cast surface, a single or plural gases that eject gas toward the film above the widthwise end of the film discharged from the die device. Rutotomoni provided ejection means, in the vicinity of the gas ejection means, apparatus for producing a resin film characterized in that a gas suction means for sucking the gas ejected from the gas ejection means. 2. The resin film manufacturing apparatus according to claim 1, wherein the gas blown from the gas blower has a wind speed of 5 m / sec or more and 100 m / sec or less. The moving means for arbitrarily moving the gas ejecting means in a uniaxial direction or a multiaxial direction near the widthwise end of the film is provided in the gas ejecting means. Equipment for the production of resin films. The apparatus for manufacturing a resin film according to any one of claims 1 to 3, wherein the gas suction means is provided on an edge side of the film. The resin according to any one of claims 1 to 4, wherein the film suction device has a suction port opened toward a film up to a landing located between the die device and a casting surface. Film production equipment. The film suction device has a plurality of suction ports and a plurality of suction means, wherein at least one of the suction ports is a suction nozzle provided so as to form a negative pressure region in contact with the film , An apparatus for producing a resin film according to claim 1. The apparatus for manufacturing a resin film according to any one of claims 1 to 6, wherein a casting surface of the casting apparatus is formed by a rotating endless belt . The apparatus for manufacturing a resin film according to claim 7, wherein the film discharged from the die device is a solution film, and the temperature of the endless belt is 50C or higher .

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