JPH10180847A - Casting device for forming resin-made film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce pressure stably with a suction chamber by a method wherein the suction chamber is installed at a seal gap from a cooling roll independently of a die, and the suction chamber is moved along a peripheral direction of the cooling roll keeping the seal gap. SOLUTION: A suction chamber 4 is installed independently of a T-die 1. Further, the suction chamber 4 is formed so as to be along an outer peripheral surface of a casting roll 3, and a required seal gap 4d is formed between the suction chamber 4 and the outer peripheral surface of the casting roll 3. Then, a driving component 7 is used as a peripherally moving mechanism moving the suction chamber 4 along a peripheral direction of the casting roll 3 keeping the required seal gap 4d. In the driving component 7, its base end side is supported coaxially with a roll support shaft 3a rotatably around the roll support shaft 3a of the casting roll 3, and the suction chamber 4 is fixed to its tip side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a film-shaped or sheet-shaped resin thin film, and is preferably used as a biaxially stretched film machine, a non-stretched film machine, a sheet machine, or the like. The present invention relates to a casting apparatus for forming a thin film.

[0002]

2. Description of the Related Art FIGS. 31 and 32 are a side view and a front view, respectively, schematically showing a conventional casting apparatus for forming a thin film made of resin. Although FIG. 32 shows only one end portion in the width direction of the conventional device, the other end portion has the same configuration. As shown in FIGS. 31 and 32, in the conventional apparatus, a T-die 101 for extruding a resin melted by an extruder (not shown) as a thin film 102 in the form of a film or a sheet,
Casting roll (cooling roll) that pulls the thin film 102 extruded from 1 onto the outer peripheral surface, cools it, and sends it out
A suction chamber (vacuum box) 104 for stably bringing the thin film 102 into close contact with the casting roll 103 is provided.

Here, the casting roll 103 is
It is rotatably supported on the side frame 107 by a roll support shaft 106. The suction chamber 104
It is fixedly attached to one side of the die 101. A vacuum pump 105 is connected to the suction chamber 104, and the air between the thin film 102 and the casting roll 103 is sucked through the opening 104 a of the suction chamber 104 by operating the vacuum pump 105. Have been.

The opening 104a is formed over the entire width of the thin film 102 immediately near the portion where the thin film 102 starts to adhere to the outer peripheral surface of the casting roll 103. A seal gap 104b is formed between the suction chamber 104 and the casting roll 103. The size of the sealing gap 104b allows the rotation of the casting roll 103 while allowing the thin film 102 to rotate.
It is set such that a required suction pressure (reduced pressure level) can be ensured at a close contact portion between the roller and the casting roll 103. In FIGS. 31 and 32, reference numeral 108 denotes wheels used when moving the apparatus.

With the above-described configuration, the resin melted by an extruder (not shown) is extruded from a T-die 101 as a thin film 102 in the form of a film or a sheet, and is drawn onto the outer peripheral surface of a casting roll 103, cooled and formed. Is done. At this time, the air in the suction chamber 104 is sucked by the vacuum pump 105 to thereby make the suction chamber 1
The air at the close contact portion between the thin film 102 and the casting roll 103 is sucked from the opening portion 104a of 04. As a result, the pressure of the contact portion is reduced, the air trapped between the thin film 102 and the casting roll 103 is eliminated, and the thin film 102 made of molten resin can be stably adhered to the casting roll 103.

[0006]

However, depending on the type of the resin, the T-die 101 and the casting roll 10 may be used.
Under the condition of a small gap with 3, the molten resin is cooled and solidified by the casting roll 103 without relaxing the orientation due to the elongation of the molten resin, so that required film characteristics (thin film characteristics) cannot be obtained. Also, the T-die 101 and the casting roll 10
Under the condition of a small gap with No. 3, the microscopic surface irregularities generated at the exit of the T-die 101 are not relaxed in the elongation section, remain as a roughened surface after cooling and solidification, and deteriorate the film quality (thin film quality). .

Therefore, required film characteristics (thin film characteristics)
It is conceivable to change the gap between the T-die 101 and the casting roll 103 depending on the type of the resin in order to obtain the following. In the conventional apparatus shown in FIGS. 31 and 32, the suction chamber 104 is fixed to the T-die 101. Therefore, the gap between the T-die 101 and the casting roll 103 cannot be changed.

For example, in the conventional apparatus shown in FIGS. 31 and 32, the casting roll 103 is lowered and T
Even if an attempt is made to increase the gap between the die 101 and the casting roll 103, the seal gap 104b between the suction chamber 104 and the casting roll 103 is enlarged, and a required suction pressure cannot be obtained. It is not possible to eliminate air trapped between the thin film 102 and the thin film 102 cannot be stably adhered to the casting roll 103.

According to experiments, the casting apparatus using the suction chamber 104 as described above is used to form the thin film 1.
02 when molding, the type of material resin, viscosity at the time of melting,
Depending on the conditions such as the thickness of the thin film 102 and the molding speed, a vacuum space formed by the thin film-like molten resin immediately after being discharged from the T-die 101, the outer peripheral surface of the casting roll 103, and the tip of the suction chamber 104 is formed. The shape and the presence or absence of outside air flowing into the vacuum space affect the stable adhesion of the thin film 102 to the casting roll 103. In particular, in the case of a resin having a relatively low elongational viscosity, the flow of outside air into the vacuum space affects the stable adhesion of the thin film 102 to the casting roll 103.

For this reason, there is a problem that the thin film 102 vibrates (oscillates) or is drawn into the suction chamber 104, and the effect is particularly large when the thin film 102 is formed at a high speed. For example, FIG.
33 shows a state of inflow of outside air (a dotted arrow indicates an air flow) in a cross section taken along line SS of FIG.
Due to the formation of a vortex due to the dynamic pressure in the portion B2 and the suction in the portion B1, the thin film 102 vibrates (oscillates) or is drawn into the suction chamber 104, which hinders high-speed thin film forming. Become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables a vacuum to be stably reduced by a suction chamber without depending on the size of a gap between a die and a cooling roll. It is another object of the present invention to provide a casting apparatus for forming a thin film made of a resin, in which a gap between a die and a cooling roll can be appropriately set to secure required thin film characteristics to improve the quality of the thin film made of a resin.

[0012]

In order to achieve the above object, a casting apparatus for forming a thin film made of a resin according to the present invention (Claim 1) comprises a die for extruding a molten resin as a thin film, and a thin film extruded from the die. A cooling roll for drawing and cooling on the outer peripheral surface and sending it out, and a suction chamber for sucking air between the thin film and the cooling roll so that the thin film is in close contact with the cooling roll. Circumferential movement for moving the suction chamber along the circumferential direction of the cooling roll while maintaining the required sealing gap while installing the required sealing gap between the die and the cooling roll. It features a mechanism.

As the circumferential moving mechanism, the following ones can be used. A drive member having a base end rotatably supported around a rotation axis of the cooling roll and having a suction chamber fixed to the tip end side (claim 2). The apparatus further comprises a guide member attached to a side frame that supports the side end of the cooling roll and guides the suction chamber along the circumferential direction of the cooling roll.

A drive member rotatably supported at the base end thereof about the rotation axis of the cooling roll, and a guide attached to the tip end of the drive member for guiding the suction chamber along the circumferential direction of the cooling roll. (Claim 4). Further, an elastic seal member may be interposed between the die and the suction chamber (claim 5).

In this case, the elastic seal member is disposed over a width exceeding the entire width of the thin film, and is formed of a foam material, and the entire surface thereof is covered with a glass cloth covered with aluminum foil. The elastic seal main body is configured to include a fitting to be attached to the suction chamber or the die, and the elastic seal main body is configured to be pressed against the die or the suction chamber with elastic force so as to close the space between the die and the suction chamber. Alternatively, the elastic sealing member may be made of a corrosion-resistant metal leaf spring which is disposed over the entire width of the thin film and is attached to the suction chamber or the die. Is configured to close the gap between the die and the suction chamber by pressing the die or the suction chamber with elastic force. Which may (claim 7).

On the other hand, a radial moving mechanism for adjusting the required seal gap by moving the suction chamber in the radial direction of the cooling roll may be provided. As the circumferential moving mechanism and the radial moving mechanism, the followings can be used. The circumferential moving mechanism comprises a driving member having a base end side rotatably supported around the rotation axis of the cooling roll and a suction chamber fixed to the distal end side, and the radial moving mechanism includes a driving member. On the other hand, a suction chamber is provided in a portion to be attached.

The circumferential moving mechanism comprises a guide member attached to a side frame which supports the side end of the cooling roll and guides the suction chamber along the circumferential direction of the cooling roll. It is configured as a mechanism for moving the guide member in the radial direction of the cooling roll (claim 10). A circumferential moving mechanism includes a driving member rotatably supported at a base end side around a rotation axis of the cooling roll, and a suction chamber attached to a distal end side of the driving member and extending the suction chamber along a circumferential direction of the cooling roll. And a guide member for guiding, and the radial movement mechanism is provided in a portion where the guide member is attached to the drive member.

[0018] In the apparatus according to any one of claims 8 to 11, an elastic seal member may be interposed between the die and the suction chamber (claim 12). In this case, the elastic seal member is disposed over the width of the thin film over the entire width, and a stick-shaped elastic seal body formed of a foam material and entirely covered with a glass cloth covered with aluminum foil,
The elastic seal main body is configured to include a fitting to be attached to the suction chamber or the die, and the elastic seal main body is configured to be pressed against the die or the suction chamber with elastic force so as to close the space between the die and the suction chamber. Or the elastic seal member may be
By constructing a corrosion-resistant metal leaf spring disposed over the entire width of the thin film and attached to the suction chamber or the die, the metal leaf spring is elastically pressed against the die or the suction chamber. It may be configured to close the space between the die and the suction chamber (claim 14).

In the apparatus according to the twelfth aspect, a shielding plate capable of shielding the end of the suction opening of the suction chamber may be provided so as to be movable in the width direction of the thin film.
5) A suction nozzle for sucking air from the side of the end of the suction opening of the suction chamber may be provided.
6) A shielding plate capable of shielding the end of the suction opening of the suction chamber is attached movably in the width direction of the thin film,
A suction nozzle for sucking air from the end side of the suction opening of the suction chamber may be provided.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. [1] Description of First Embodiment FIG. 1 is a side view schematically showing a casting apparatus for forming a thin film made of a resin according to a first embodiment of the present invention. As shown in FIG. Also has a T-die (die) 1 for extruding a resin melted by an extruder (not shown) as a thin film 2 in the form of a film or a sheet, and a thin film 2 extruded from the T-die 1 on an outer peripheral surface. It has a casting roll (cooling roll) 3 for taking out, cooling and sending out, and a suction chamber 4 for sucking air between the thin film 2 and the casting roll 3 so that the thin film 2 is stably adhered to the casting roll 3. It is configured.

In the present embodiment, the suction chamber 4 is T
It is provided independently of the die 1. The suction chamber 4 is formed along the outer peripheral surface of the casting roll 3, and the suction chamber 4 and the casting roll 3
A required seal gap 4d is formed between the outer peripheral surface and the outer peripheral surface. The size (interval) of this seal gap 4d
Is set such that a required suction pressure (reduced pressure level) can be ensured at a close contact portion between the thin film 2 and the casting roll 3 while allowing the rotation of the casting roll 3.

As in the prior art, a vacuum pump 5 is connected to the suction chamber 4, and by operating the vacuum pump 5, air between the thin film 2 and the casting roll 3 is released from the opening 4 a of the suction chamber 4. It is configured to be sucked through. Opening 4a (suction port)
Is formed over the entire width of the thin film 2 immediately near the portion where the thin film 2 starts to adhere to the outer peripheral surface of the casting roll 3.

In the first embodiment, the driving member 7 is used as a circumferential moving mechanism for moving the suction chamber 4 along the circumferential direction of the casting roll 3 while maintaining a required sealing gap 4d. . The drive member 7 is rotatably supported on the base end thereof coaxially with the roll support shaft 3a so as to be rotatable around a roll support shaft (rotating shaft) 3a of the casting roll 3 (in the direction of arrow A in FIG. 1). At the same time, the suction chamber 4 is fixed to the distal end side.

An elastic seal (elastic seal member) 6 is interposed between the T-die 1 and the suction chamber 4, and the elastic seal 6 is provided between the T-die 1 and the suction chamber 4. The gap is sealed. Since the casting apparatus for forming a thin film made of resin according to the first embodiment of the present invention is configured as described above, the resin melted by the extruder (not shown) is transferred from the T-die 1 to the thin film 2 in the form of a film or sheet. And cast on the outer peripheral surface of the casting roll 3 to be cooled and formed.

At this time, by sucking the air in the suction chamber 4 by the vacuum pump 5, the air at the close contact portion between the thin film 2 and the casting roll 3 is sucked from the opening 4a of the suction chamber 4. As a result, the space in the vicinity of the close contact portion is decompressed, the air caught between the thin film 2 and the casting roll 3 is eliminated, and the thin film 2 made of molten resin can be stably adhered to the casting roll 3. .

Here, required film characteristics (thin film characteristics)
Considering the case where the gap between the T-die 1 and the casting roll 3 is changed depending on the type of resin in order to obtain
For example, the gap (interval) between the T-die 1 and the casting roll 3 can be increased by retreating (lowering) the casting roll 3. However, in the conventional apparatus, simply moving the casting roll 3 backward increases the distance between the thin film 2 and the opening 4a of the suction chamber 4, and also increases the seal gap 4d between the suction chamber 4 and the casting roll 3. As a result, the space (pressure reduction space) near the close contact portion between the thin film 2 and the casting roll 3 cannot be set to a required pressure reduction level.

In this embodiment, the suction chamber 4 is separated from the T-die 1 and is provided independently of the T-die 1. The suction chamber 4 holds a required sealing gap 4d between the suction chamber 4 and the casting roll 3. Meanwhile, the driving member 7 can move the casting roll 3 along the circumferential direction. Therefore, when the gap between the T-die 1 and the casting roll 3 is large, the suction chamber 4 is moved counterclockwise around the roll support shaft 3 a by the driving member 7 to be advanced to a required position, and The suction port (opening 4a) is formed with the thin film 2 and the casting roll 3
The distance between the thin film 2 and the opening 4a of the suction chamber 4 is reduced by approaching the close contact start portion. Conversely, T
When the gap between the die 1 and the casting roll 3 is small, the suction chamber 4 is moved by the driving member 7 to the roll support shaft 3.
Move clockwise around a and retreat to the required position.

At this time, since the suction chamber 4 is formed along the outer peripheral surface of the casting roll 3, even if the suction chamber 4 is rotated by the driving member 7,
A required seal gap 4d is always maintained between the suction chamber 4 and the outer peripheral surface of the casting roll 3. By setting the position of the suction chamber 4 and holding the seal gap 4d as described above, a required decompression level is secured in the decompression space regardless of the size of the gap between the T die 1 and the casting roll 3. Thus, the pressure in the space between the thin film 2 and the casting roll 3 can be stably reduced by the suction chamber 4.

Further, by changing the size of the gap between the T-die 1 and the casting roll 3 and the position of the suction chamber 4 as described above, the T-die 1 and the suction chamber 4 are changed.
In this embodiment, the elastic seal 6 is interposed between the T-die 1 and the suction chamber 4 even if the gap (interval) between the T-die 1 and the suction chamber 4 changes. The space between the suction chamber 4 and the suction chamber 4 is closed by an elastic seal member. Thereby, airtightness of the decompression space surrounded by the T-die 1, the thin film 2, and the suction chamber 4 can be ensured, and a required decompression level can be reliably obtained in the decompression space.

The operation of rotating the drive chamber 7 around the roll support shaft 3a to rotate the suction chamber 4 may be performed manually or by using a drive mechanism (drive motor) not shown. You may. As described above, according to the casting apparatus for forming a thin film made of resin as the first embodiment of the present invention, the gap between the thin film 2 and the casting roll 3 can be determined regardless of the size of the gap between the T die 1 and the casting roll 3. Can be stably performed by the suction chamber 4 in the space above, so that the gap between the T-die 1 and the casting roll 3 can be appropriately set for any resin, and required film characteristics ( As a result, the quality of the resin thin film (film or sheet) 2 can be significantly improved.

[2] Description of Second Embodiment FIG. 2 is a view schematically showing a resin thin film molding casting apparatus according to a second embodiment of the present invention.
As shown in the figure, the casting apparatus of the second embodiment is configured substantially in the same manner as that of the first embodiment, but in the second embodiment, the suction chamber 4 is cast while maintaining a required seal gap 4d. The guide member 8 serves as a circumferential moving mechanism for moving the roll 3 along the circumferential direction.
Is used.

The guide member 8 is attached to a side frame 8b which supports a side end of the casting roll 3. The guide member 8 is provided with the suction chamber 4 in the circumferential direction of the casting roll 3 (the direction of arrow B in FIG. 2).
A long guide rail 8a is formed in which two pins (or rolls) 4c, 4c attached to the side surface of the suction chamber 4 are engaged so as to be guided along.

The configuration of the casting apparatus according to the second embodiment is the same as that of the first embodiment except for the above-described circumferential movement mechanism, and a description thereof will be omitted.
Since the resin thin film casting apparatus according to the second embodiment of the present invention is configured as described above, when the gap between the T die 1 and the casting roll 3 is large, the suction chamber 4 is connected to the guide member 8. It is moved counterclockwise (leftward in FIG. 2) along the elongated hole guide rail 8a to advance to a required position, and the suction port (opening 4a) of the suction chamber 4 is moved between the thin film 2 and the casting roll 3. By approaching the contact start portion, the distance between the thin film 2 and the opening 4a of the suction chamber 4 is reduced. Conversely, when the gap between the T-die 1 and the casting roll 3 is small, the suction chamber 4 is moved clockwise (to the right in FIG. 2) along the elongated guide rail 8 a of the guide member 8. Retract to the required position.

At this time, similarly to the first embodiment, since the suction chamber 4 is formed along the outer peripheral surface of the casting roll 3, the suction chamber 4 is formed on the elongated guide rail 8a of the guide member 8. Even if it moves along, a required seal gap 4d is always maintained between the suction chamber 4 and the outer peripheral surface of the casting roll 3. The operation of moving the suction chamber 4 along the guide rail 8a may be performed manually, or may be performed using a drive mechanism (not shown).

As described above, the same function and effect as in the first embodiment can be obtained by the casting apparatus for forming a thin film made of resin according to the second embodiment of the present invention. [3] Description of Third Embodiment FIG. 3 is a view schematically showing a casting apparatus for forming a resin thin film as a third embodiment of the present invention.
As shown in FIG. 7, the casting apparatus of the third embodiment is configured substantially in the same manner as that of the first embodiment, but in the third embodiment, the suction chamber 4 is cast while maintaining a required seal gap 4d. A driving member 9 and a guide member 10 are used as a circumferential moving mechanism for moving the roll 3 along the circumferential direction.

Here, the drive member 9 is coaxial with the roll support shaft 3a so that the base end thereof can rotate around the roll support shaft (rotation shaft) 3a of the casting roll 3 (the direction of arrow D in FIG. 3). The guide member 10 is attached to the distal end side of the drive member 9. The guide member 10 has two pins (or rolls) 4c attached to the side surfaces of the suction chamber 4 so as to guide the suction chamber 4 along the circumferential direction of the casting roll 3 (the direction of arrow C in FIG. 3). , 4c to be engaged with the elongated guide rail 10a
Are formed.

Since the casting apparatus for forming a resin thin film according to the third embodiment of the present invention is configured as described above, when the gap between the T-die 1 and the casting roll 3 is large, the suction chamber 4 is driven. The suction chamber 4 is moved along the elongated guide rail 10a of the guide member 10 after coarse adjustment is performed by moving the roll 9 around the roll support shaft 3a in the counterclockwise direction and moving it to an appropriate position. Make fine adjustments to position
The suction port (opening 4a) of the suction chamber 4 is positioned near the contact start portion between the thin film 2 and the casting roll 3.

Conversely, the T-die 1 and the casting roll 3
If the gap between the suction chamber 4 and the suction chamber 4 is small, the suction chamber 4 is moved clockwise around the roll support shaft 3a by the driving member 9 to make a rough adjustment to retreat to an appropriate position. Elongated guide rail 1
Fine adjustment for moving along 0a and positioning at a required position is performed.

At this time, similarly to the first embodiment, since the suction chamber 4 is formed along the outer peripheral surface of the casting roll 3, even if the suction chamber 4 is rotated by the driving member 9, Even if the suction chamber 4 moves along the elongated guide rail 10a of the guide member 10, a required seal gap 4d is always maintained between the suction chamber 4 and the outer peripheral surface of the casting roll 3.

The operation of rotating the drive chamber 9 around the roll support shaft 3a to rotate the suction chamber 4 may be performed manually or by using a drive mechanism (drive motor) not shown. You may. Similarly, suction chamber 4
May be manually performed or may be performed using a drive mechanism (not shown).

As described above, the same function and effect as those of the first embodiment can be obtained by the resin thin film casting apparatus according to the third embodiment of the present invention.
In the third embodiment, the positioning of the suction chamber 4 is performed in two ways: coarse adjustment by the drive member 9 and fine adjustment by the guide member 10.
Since the positioning is performed in stages, positioning can be performed with high accuracy.

In the first to third embodiments described above,
Although the space between the T-die 1 and the suction chamber 4 is closed by the elastic seal body 6, any material can be used as long as the gap between the T-die 1 and the suction chamber 4 can be closed while following the change in size. Besides an elastic body such as rubber, a bellows-shaped member or the like can be used. In the above-described embodiment, the driving member 7; the guide member 8; the driving member 9; and the circumferential moving mechanism that moves the suction chamber 4 along the circumferential direction of the casting roll 3 while maintaining the required seal gap 4d. Although three modes using the guide member 10 have been described, the present invention is not limited to this, and the suction chamber 4 is moved along the circumferential direction of the casting roll 3 while maintaining a required seal gap 4d. Other mechanisms may be used as long as they can be moved.

[4] Description of Fourth Embodiment FIGS. 4 to 7 each show a main part of a resin thin film casting apparatus according to a fourth embodiment of the present invention. , Respectively, is a perspective view and a side sectional view showing a configuration and an attached state of the elastic seal member, FIG. 6 is a side sectional view showing a mounted state of the elastic seal member, and FIG. 7 is different in size from that shown in FIG. It is a sectional side view showing the state where the elastic seal member was mounted.

In the fourth embodiment, a more specific embodiment of the elastic seal 6 interposed between the T-die 1 and the suction chamber 4 in the first to third embodiments will be described. . In the drawings, the same reference numerals as those described above indicate the same portions, and thus detailed description thereof will be omitted. In the fourth to twelfth embodiments, the suction chamber (vacuum box) indicated by reference numeral 4 in the first to third embodiments is indicated by reference numeral 40, and the elastic seal body 6 is described as the elastic seal member 50.

As shown in FIGS. 4, 5 and 6, the fourth
Suction chamber 4 in casting apparatus of embodiment
0 performs the same function as the suction chamber 4 in the first to third embodiments, and includes the upper wall 41a, 41b, the rear wall 4
The housing 41 includes a housing 1c and left and right side walls 41d, and labyrinth packings 42 and 43 fixed to lower portions of outer surfaces of the rear wall 41c and the left and right side walls 41d, respectively. The labyrinth packing 43 is fixedly provided on each of the left and right side walls 41d.

Then, in front of the suction chamber 40 (FIG. 5,
6 is open, and a suction port (opening) 40 a is formed between the upper wall 41 a of the suction chamber 40 and the outer peripheral surface of the casting roll 3. Also, the housing 4
1 is closed by the outer peripheral surface of the casting roll 3 from below except for the suction port 40a, and a suction chamber 40b is formed between the housing 41 and the casting roll 3.

The labyrinth packings 42 and 43 are opposed to the outer peripheral surface of the casting roll 3 at a small interval, and suppress the inflow of air from the lower portion of the rear wall 41c and the left and right side walls 41d. Note that a rubber seal, a felt seal, or the like can be used instead of the labyrinth packings 42, 43. The suction chamber 40b is connected to the vacuum pump 5 (see FIGS. 1 to 3) via a suction duct 60 fixed to the upper wall 41b.

The entire suction chamber 40 is shown in FIGS.
3, is rotatably supported concentrically (around the roll support shaft 3a) with the casting roll 3 by any of the circumferential movement mechanisms described with reference to FIG. It can rotate and move along the outer peripheral surface. Now, the elastic seal member 50 of the present embodiment is disposed over a width exceeding the entire width of the thin film 2, and as shown in FIGS. 4 to 7, the elastic seal main body 51 and the mounting bracket (mounting tool) 52. And 53.

The elastic seal body 51 is formed in a rod shape having a semicircular cross section with a foam material such as polyimide foam having excellent heat resistance and high rebound resilience and low compression residual strain, and its front surface is covered with aluminum foil. Covered with glass cloth (in which aluminum foil and glass cloth are integrally bonded with an adhesive). This elastic seal body 51
The lower portion is sandwiched from the front and rear by rising portions 52b and 53b of the mounting brackets 52 and 53, and these mounting brackets 52 and 53 are fixed to the suction chamber 4 by mounting bolts 55.
0, and is fixed to the suction chamber 40 by being fixed to the upper wall 41a.

As shown in FIG. 6 and FIG. 7, the elastic seal member 50 presses the elastic seal body 51 against the T die 1 with an elastic force so as to contact the T die 1.
And the suction chamber 40 are closed. Mounting bracket 5
3 is arranged so as to rest on the mounting bracket 52,
In a state where the long hole 52a formed on the second side and the long hole 53a formed on the mounting bracket 53 are aligned, these long holes 5a are aligned.
By attaching the mounting bolt 55 to the upper wall 41a of the suction chamber 40 through the washer 54 through the washer 54, the mounting brackets 52 and 53 are integrally fixed. As shown in FIG.
The female screw on the side of the upper wall 41a that is screwed into is formed as a blind screw by the back plate 41e.

As shown in FIG. 7, the elongated hole 52a is formed so that the position of the mounting bracket 53 can be changed in order to mount the elastic seal bodies 51 having different sizes to the suction chamber 40. The long hole 53a is formed so as to be able to adjust the mounting position of the elastic seal member 50 with respect to the suction chamber 40 in cooperation with the long hole 52a on the mounting bracket 52. It is also possible to move and attach the elastic seal member 50 from the position indicated by the solid line to the position indicated by the alternate long and short dash line A3 in FIGS.

In FIG. 6, since the thin film (film, sheet) 2 is thin in the apparatus of the fourth embodiment, for example,
The force for sucking the thin film 2 by the suction chamber 40 is relatively small and sufficient, and the T die 1 and the casting roll 3
The state in which the distance between is set small is shown. In FIG. 7, in the apparatus of the fourth embodiment, for example, since the thin film (film, sheet) 2 is thick, the force for sucking the thin film 2 by the suction chamber 40 needs to be relatively large, and the T die 1 and the casting roll 3 shows a state in which the distance between them is set large.

The lower surface of the T-die 1 in the apparatus shown in FIGS. 1 to 3 has a gradient that extends from the horizontal plane near the extrusion opening of the thin film 2 toward the outside (right side in the figure). On the other hand, in the present embodiment shown in FIGS. 6 and 7,
Although the case where the lower surface shape of the T die 1 has two different gradients is shown, there is no significant difference between the lower surface shapes of the T die 1. Alternatively, the elastic seal member 50 may be attached to the lower surface of the T-die 1 so as to press and contact the upper surface of the suction chamber 40 with elastic force.

Next, the operation of the resin thin film casting apparatus according to the fourth embodiment of the present invention will be described. The molten resin is extruded from the T-die 1 to form a thin film 2, is wound around a casting roll 3, and is formed by cooling. When the suction chamber 40 is not used, the thin film 2 in the molten state is drawn by the casting roll 3 and runs in a direction indicated by a two-dot chain line A1 in FIG. 6 or FIG. The quality of the thin film 2 is degraded because air is entrained in the thin film 2.

Then, the suction operation of the suction chamber 40 makes the rear side of the thin film 2 (the right side in FIGS. 6 and 7) a negative pressure, and pulls the thin film 2 rearward by the pressure difference from the front side to change the attitude of the thin film 2. 6 and 7, the angle at which the thin film 2 enters the casting roll 3 is increased.
A partition is formed on the rear side of the thin film 2 to create a negative pressure on the rear side of the thin film 2, and air between the thin film 2 and the thin film 2 is sucked by the suction chamber 40, but the size of the partitioned space is not appropriate. Then, an unstable phenomenon occurs in which the thin film 2 vibrates due to the sucked air. In particular, when air flows into the suction chamber 40b between the T-die 1 and the suction chamber 40 as shown by an arrow A2 in FIG.

For this reason, the tip of the suction chamber 40 is adjusted to an optimum position where the unstable phenomenon hardly occurs. However, even if the position of the suction chamber 40 is changed for the adjustment, the inflow passage of the air from the outside is restricted. It is necessary to close the gap between the T-die 1 and the suction chamber 40 so as not to be formed.
The elastic sealing member 50 of the present embodiment is
Even if the gap between the upper surface of the T-die 1 and the lower surface of the T-die 1 changes, it is elastically deformed and automatically closes the gap. 6 and 7, the outline shape of the elastic seal member 50 before the suction chamber 40 moves (the outline shape before being deformed by being pressed from the T-die 1) is indicated by a two-dot chain line.

The T-die 1 and the casting roll 3
When the positional relationship between the elastic seal member 50 and the elastic seal member 50 is largely changed, the elastic seal member 50 itself needs to be replaced with another elastic seal member. As described above, according to the casting apparatus for forming a thin film made of resin as the fourth embodiment of the present invention, even if the position of the suction chamber 40 is changed, the gap between the upper surface of the suction chamber 40 and the lower surface of the T-die 1 is changed. Can be reliably and automatically closed by the elastic seal member 50, so that the airtightness of the decompression space surrounded by the T-die 1, the thin film 2, and the suction chamber 40 can be ensured, and the required decompression in the decompression space The level can be reliably obtained.

Each thin film (film, sheet) 2
As described above, even when the position of the suction chamber 40 is changed, the upper surface of the suction chamber 40 and the lower surface of the T-die 1 are adjusted even when the position of the suction chamber 40 is changed, as described above. Can be reliably and automatically closed by the elastic seal member 50, so that the vibration of the thin film 2 caused by air flowing into the suction chamber 40 from the gap can be reliably prevented, and the adjustment work is extremely performed. It can be easily performed, and can immediately start the production operation after the adjustment work.

[5] Description of Fifth Embodiment FIGS. 8 (a) to 8 (c) each show the construction and mounting of an elastic seal member in a resin thin film casting apparatus according to a fifth embodiment of the present invention. It is a side sectional view showing a state. In the fifth embodiment, as an elastic seal member for closing the space between the T-die 1 and the suction chamber 40, FIGS.
Instead of the elastic sealing member 50 in the casting device of the fourth embodiment described above with reference to FIG. 7, leaf springs 56a to 56c as shown in any of FIGS.
Are used, and the other parts are configured in the same manner as in the fourth embodiment.

These leaf springs 56a to 56c are made of a corrosion-resistant thin metal (plate thickness is 1 mm or less) such as stainless steel, and are arranged over a width exceeding the entire width of the thin film 2. It is attached to the upper wall 41a by the attachment bolt 55. And metal leaf springs 56a-
The space between the lower surface of the T-die 1 and the upper surface of the suction chamber 40 is closed by bringing the 56c into pressure contact with the lower surface of the T-die 1 with elastic force.

The leaf spring 56a shown in FIG.
The leaf spring 56b shown in FIG. 8B has a shape in which the tip is inflated in an arc shape and is folded back, and is a mountain-shaped leaf spring having an arc portion on an upper part, and is shown in FIG.
c is a hook-shaped one with the tip side directed upward, and in each of the figures, the state of being deformed by contact with the T-die 1 is indicated by a two-dot chain line.

Each of these leaf springs 56a to 56c makes contact with both the lower surface of the T-die 1 and the upper surface of the suction chamber 40 with elastic force to close the gap, and the shape thereof is shown in FIG. The shape is not limited to the shape shown in FIG. Further, the leaf springs 56a to 56c are
May be attached to the upper surface of the suction chamber 40 with elastic force.

Further, the T-die 1 and the casting roll 3
When changing the positional relationship with the plate spring 56a
~ 56c itself is exchanged for another size. As described above, the casting apparatus for forming a thin film made of resin according to the fifth embodiment of the present invention can also be used as shown in FIG.
(A) to leaf springs 56a to 56c as shown in FIG.
The same operation and effect as in the fourth embodiment can be obtained by using.

[6] Description of Sixth Embodiment FIGS. 9 to 16 show a casting apparatus for forming a thin film made of resin according to a sixth embodiment of the present invention, and FIGS. FIGS. 11 and 12 are a perspective view and a side sectional view, respectively, showing a configuration and an attached state of the elastic seal member.
3 is a side sectional view showing a mounted state of the elastic seal member, FIG. 14 is a side sectional view showing a state where an elastic seal member having a size different from that shown in FIG. 13 is mounted, FIGS.
6 is a schematic side view for explaining the operation example. In the drawings, the same reference numerals as those described above indicate the same or similar portions, and thus detailed description thereof may be omitted.

As shown in FIGS. 1 and 2, the casting apparatus according to the sixth embodiment also has a T-die (die) 1 for extruding a resin melted by an extruder (not shown) as a thin film 2 in the form of a film or a sheet. A casting roll (cooling roll) 3 for drawing the thin film 2 extruded from the T-die 1 onto the outer peripheral surface, cooling it, and sending it out;
And a suction chamber 40 for sucking air between the thin film 2 and the casting roll 3 so as to stably adhere to the casting roll 3. The casting roll 13 is rotatably supported by a roll support shaft 16 with respect to a side frame 17. Wheels 18 used for moving the apparatus in a horizontal direction are mounted below the side frame 17. Have been.

Also in this embodiment, the suction chamber 40
Are provided independently of the T-die 1. In addition, the suction chamber 40 is formed along the outer peripheral surface of the casting roll 3, and a required sealing gap is formed between the suction chamber 40 and the outer peripheral surface of the casting roll 3. The size (interval) of the seal gap is set such that a required suction pressure (reduced pressure level) can be secured at the close contact portion between the thin film 2 and the casting roll 3 while allowing the rotation of the casting roll 3. I have.

Incidentally, the suction chamber 40 is shown in FIGS.
As shown in FIGS. 3 and 14, the suction chamber 40 has the same configuration as the suction chamber 40 of the fourth embodiment described above with reference to FIGS. A vacuum pump 5 is connected to the suction chamber 40 through a suction duct 60. By operating the vacuum pump 5, air between the thin film 2 and the casting roll 3 is sucked into the suction port ( Opening) 40
a. The suction port 40a is formed over the entire width of the thin film 2 immediately near a portion where the thin film 2 starts to adhere to the outer peripheral surface of the casting roll 3.

In the sixth embodiment, as in the first embodiment, a driving member is used as a circumferential moving mechanism for moving the suction chamber 40 along the circumferential direction of the casting roll 3 while maintaining a required sealing gap. 110 is used. The drive member 110 is supported coaxially with the roll support shaft 16 so that its base end can rotate around the roll support shaft (rotation shaft) 16 of the casting roll 3 (in the direction of arrow A in FIG. 9). Together with the suction chamber 40
Has been fixed.

The drive member 110 is formed with two long holes 110a in the radial direction of the casting roll 3, and by adjusting the tightening position of the support bolt 11 passing through these long holes 110a, The suction chamber 40 is attached to the driving member 110 so as to be movable in the radial direction of the casting roll 3, that is, the required sealing gap between the outer peripheral surface of the casting roll 3 and the suction chamber 40 is adjustable. I have. The above-described elongated hole 110a and the support bolt 11 constitute a radial moving mechanism. Although FIG. 10 shows only one end portion in the width direction of the device of the present embodiment, the other end portion has the same configuration.

Further, an elastic seal member 50 is interposed between the T-die 1 and the suction chamber 40, and the gap between the T-die 1 and the suction chamber 40 is sealed by the elastic seal member 50. I have. This elastic sealing member 50
Are disposed over a width exceeding the entire width of the thin film 2, similarly to the elastic seal member 50 of the fourth embodiment described with reference to FIGS. 4 to 7, and as shown in FIGS. It comprises a seal body 51 and mounting brackets (mounting tools) 52 and 53.

Here, the elastic seal body 51 is formed in a rod shape having a semicircular cross section by a foam material such as polyimide foam having excellent heat resistance and high rebound resilience and low compression residual strain, and its front surface is covered with aluminum foil. Covered with glass cloth (in which aluminum foil and glass cloth are integrally bonded with an adhesive). This elastic seal body 51
The lower portion is sandwiched from the front and rear by rising portions 52b and 53b of the mounting brackets 52 and 53, and these mounting brackets 52 and 53 are fixed to the suction chamber 4 by mounting bolts 55.
0, and is fixed to the suction chamber 40 by being fixed to the upper wall 41a.

As shown in FIG. 6 and FIG. 7, the elastic seal member 50 presses the elastic seal body 51 against the T die 1 with an elastic force to thereby make the T die 1
And the suction chamber 40 are closed. Mounting bracket 5
3 is arranged so as to rest on the mounting bracket 52,
In a state where the long hole 52a formed on the second side and the bolt hole 53a formed on the mounting bracket 53 are aligned, the mounting bolt 55 is inserted into the long hole 52a and the bolt hole 53a via the washer 54. The upper wall 4 of the suction chamber 40 through
By tightening to 1a, the mounting brackets 52 and 53 are integrally fixed. As shown in FIG. 12, the female screw on the side of the upper wall 41a to be screwed with the mounting bolt 55 is configured as a blind screw by the back plate 41e.

As shown in FIG. 14, the elongated hole 52a is formed so that the position of the mounting bracket 53 can be changed in order to mount the elastic seal main bodies 51 having different sizes to the suction chamber 40. In FIGS. 9, 13 and 15, in the apparatus of the sixth embodiment, for example, the thin film 2 is used.
In this case, the force for sucking the thin film 2 by the suction chamber 40 is relatively small and sufficient, and the distance between the T die 1 and the casting roll 3 is set small. 14 and 16, in the apparatus of the sixth embodiment, for example, since the thin film 2 is thick, the force for sucking the thin film 2 by the suction chamber 40 needs to be relatively large, and the T die 1 and the casting roll 3 The state in which the distance between is set large is shown.

Next, the operation of the casting apparatus for forming a thin film made of resin according to the sixth embodiment of the present invention constructed as described above will be described. The device of the sixth embodiment basically operates in the same manner as the first embodiment shown in FIG. In this embodiment, as shown in FIG. 15 and FIG.
The gap between the die 1 and the casting roll 3 can be increased. However, if the casting roll 3 is simply retracted, the thin film 2 and the casting roll 3 are not moved.
The opening on the side surface formed by the outer peripheral surface of the suction chamber 40 and the tip of the suction chamber 40 becomes large, and the required pressure reduction level is not reached.

Therefore, as shown in FIG.
The suction chamber 40 attached to the suction chamber 4 is advanced to a required position to reduce the side opening, and
By sucking the air inside 0 to a required reduced pressure level by the vacuum pump 5, the molten thin film 2 can be stably adhered to the casting roll 3 immediately after being extruded from the T-die 1.

Further, as described above, by changing the size of the gap between the T-die 1 and the casting roll 3 and the position of the suction chamber 40, even if the gap (interval) between the T-die 1 and the suction chamber 40 changes. In this embodiment,
Elastic sealing member 5 between T-die 1 and suction chamber 40
Since 0 is interposed, the space between the T-die 1 and the suction chamber 40 is closed by an elastic seal member while following the change.

The elastic seal member 50 of this embodiment is elastically deformed even if the gap between the upper surface of the suction chamber 40 and the lower surface of the T-die 1 changes and automatically closes the gap. ing. Thereby, the airtightness of the reduced-pressure space surrounded by the T-die 1, the thin film 2, and the suction chamber 40 can be ensured, and a required reduced-pressure level can be reliably obtained in the reduced-pressure space. 13 and 14,
The outline shape of the elastic seal member 50 before the suction chamber 40 moves (the outline shape before being deformed by being pressed from the T-die 1) is indicated by a chain line 50a.

The T-die 1 and the casting roll 3
14 or FIG. 1 when the positional relationship with
As shown in FIG. 6, the adjustment is performed by replacing the elastic seal member 50 itself with another one having another size. Alternatively, the elastic seal member 50 may be attached to the lower surface of the T-die 1 so as to press and contact the upper surface of the suction chamber 40 with elastic force.

As described above, according to the casting apparatus for forming a thin film made of resin according to the sixth embodiment of the present invention, the suction chamber 40 holds the required sealing gap between the casting roll 3 and the casting roll. 3
The suction chamber 40 is movable in the circumferential direction of the suction roll 40 and also in the radial direction of the casting roll 3.
In addition to being able to adjust the gap between the seal and the casting roll 3, the elastic seal member 50 can seal the gap regardless of the size of the gap between the lower surface of the T-die 1 and the upper surface of the suction chamber 40. it can.

Therefore, regardless of the size of the gap between the T die 1 and the casting roll 3, the pressure in the space between the thin film 2 and the casting roll 3 is reduced by the suction chamber 4.
0, the gap between the T-die 1 and the casting roll 3 can be set appropriately for any resin, and required film characteristics (thin film characteristics) are secured. The quality of the resin thin film (film or sheet) 2 can be greatly improved.

[7] Description of Seventh Embodiment FIGS. 17 (a) to 17 (c) show the construction and mounting of an elastic seal member in a resin thin film casting apparatus according to a seventh embodiment of the present invention. It is a side sectional view showing a state. In the seventh embodiment, instead of the elastic sheet member 50 in the above-described sixth embodiment, the same as those described in the fifth embodiment with reference to FIGS.
(C) The leaf springs 56a to 56c as shown in any of (c) are used, and the other parts are configured similarly to the sixth embodiment.

As in the fifth embodiment, these leaf springs 56a to 56c are made of a corrosion-resistant thin metal such as stainless steel (having a plate thickness of 1 mm or less) and extend over the entire width of the thin film 2. Upper wall 41a of the suction chamber 40
Is attached by a mounting bolt 55. And
By pressing the metal leaf springs 56a to 56c against the lower surface of the T die 1 with elastic force, the space between the lower surface of the T die 1 and the upper surface of the suction chamber 40 is closed.

The leaf spring 56a shown in FIG.
Has a shape in which the tip is bulged in an arc shape and folded back, and a plate spring 56b shown in FIG. 17B is a mountain shape having an arc portion at an upper portion, and a plate spring 56b shown in FIG. The spring 56c has a hook shape with the tip side facing upward,
In each of the figures, the state of being deformed by contact with the T-die 1 is indicated by a two-dot chain line.

Each of these leaf springs 56a to 56c contacts both the lower surface of the T-die 1 and the upper surface of the suction chamber 40 with elastic force to close the gap, and the shape thereof is shown in FIG. The shape is not limited to the shape shown in FIG. Further, the leaf springs 56a to 56c may be attached to the lower surface of the T-die 1 so as to press the upper surface of the suction chamber 40 with an elastic force.

Further, the T-die 1 and the casting roll 3
When changing the positional relationship with the plate spring 56a
~ 56c itself is exchanged for another size. Thus, the casting apparatus for forming a thin film made of resin according to the seventh embodiment of the present invention can also be used as shown in FIG.
7 (a) to 17 (c), leaf springs 56a to 5
By using 6c, the same operation and effect as in the sixth embodiment can be obtained.

[8] Description of Eighth Embodiment FIGS. 18 to 20 show a casting apparatus for forming a thin film made of resin according to an eighth embodiment of the present invention, and FIG. 18 is a schematic side view thereof. 19 is a perspective view showing a configuration and an attached state of the elastic seal member and the shielding plate, and FIG. 20 is a diagram showing an inflow state of outside air in a cross section taken along line PP of FIG. Note that the same reference numerals as those described above indicate the same or similar parts, and thus description thereof will be omitted.

The eighth embodiment has a configuration substantially similar to that of the above-described sixth embodiment, as shown in FIG. 18. However, in the present embodiment, as shown in FIGS. At the end of the suction port (suction opening) 40a of 40, a shielding plate 160 for shielding the opening at the end and suppressing suction from the end is attached movably in the width direction of the thin film 2. I have.

That is, as shown in FIG.
0, a long hole 160a is formed.
0a and through suction washer 161 through suction chamber 4
0 mounting bolt 16 tightened against the upper wall 41a
2, the shielding plate 160 is attached to the suction chamber 40. The shielding plate 160 can be moved in the width direction of the thin film 2 by the long holes 160, and the amount of shielding at the end of the suction port 40 a of the suction chamber 40 can be adjusted. Although FIG. 19 shows only one end portion in the width direction of the device of the present embodiment, the other end portion is similarly configured.

The casting apparatus for forming a thin film made of a resin according to the eighth embodiment, which is constructed as described above, is also basically the same as the sixth embodiment.
Since the operation is the same as that of the embodiment, only the operation and effect of the shielding plate 160 will be described here with reference to FIG. In the conventional example shown in FIG. 33, as described above, since the flow from the front surface becomes the main flow with respect to the front opening portion of the suction chamber 104, the vortex is formed by the dynamic pressure in the B2 portion and the suction in the B1 portion. This causes a problem that the thin film 102 vibrates (oscillates) or is drawn into the suction chamber 104.

On the other hand, in the present embodiment, as shown by the dotted arrows in FIG. 20, the rectifying effect of the shielding plate 160 causes the flow from the side to the main opening to be the main flow. And the formation of vortices is suppressed, the vibration (oscillation) of the thin film 2 and the drawing into the suction chamber 40 are suppressed, and stable thin film molding can be performed with any resin.

In particular, in the present embodiment, when a thin film is formed from a resin having a relatively low elongational viscosity, a great effect is exerted to stably adhere the thin film 2 to the casting roll 3. The airflow can be appropriately controlled by moving the shielding plate 160 in accordance with the amount of necking of the thin film 2.

[0092]

[9] Description of Ninth Embodiment FIGS. 21 to 23 show a casting apparatus for forming a resin thin film as a ninth embodiment of the present invention. FIG. 21 is a schematic side view thereof, and FIG. FIG. 2 is a perspective view showing a configuration and an attached state of an elastic seal member and a suction nozzle, FIG.
FIG. 3 is a diagram showing an inflow state of outside air in a cross section along the line QQ in FIG. 21. Note that the same reference numerals as those described above indicate the same or similar parts, and thus description thereof will be omitted.

The ninth embodiment is substantially the same as the sixth embodiment described above, as shown in FIG. 21, but in the present embodiment, as shown in FIGS. A side suction nozzle 70 for sucking air from the side of the end of the suction port (suction opening) 40a of 40 is attached. The side suction nozzle 70 is connected to a vacuum pump 71, and the air at the end of the suction port 40 a of the suction chamber 40 is sucked from the side suction nozzle 70 by the vacuum pump 71. Although FIG. 22 shows only one end portion in the width direction of the device of the present embodiment, the other end portion has the same configuration.

The resin thin film casting apparatus according to the ninth embodiment, which is constructed as described above, is also basically the same as the sixth embodiment.
Since the operation is the same as that of the embodiment, only the operation and effect of the side suction nozzle 70 will be described here with reference to FIG. In the present embodiment, as shown by a dotted arrow in FIG.
The flow due to the suction into the side suction nozzle 70 becomes the main flow, the formation of dynamic pressure and vortex is suppressed, the vibration (oscillation) of the thin film 2 and the drawing into the suction chamber 40 are suppressed, and a stable thin film forming is possible with any resin. Can be performed.

In particular, in the present embodiment, when forming a thin film using a resin having a relatively low elongational viscosity, a great effect is exerted to stably adhere the thin film 2 to the casting roll 3. The air flow can be controlled by controlling the amount of air sucked into the suction chamber 40 and the side suction nozzle 71 by the vacuum pumps 5 and 71, respectively.

[10] Description of Tenth Embodiment FIGS. 24 to 26 show a resin thin film casting apparatus according to a tenth embodiment of the present invention.
Is a schematic side view thereof, and FIG. 25 is an elastic seal member thereof.
FIG. 26 is a perspective view showing a configuration and an attached state of the shield plate and the suction nozzle, and FIG. 26 is a diagram showing an inflow state of outside air in a cross section taken along line RR of FIG. Note that the same reference numerals as those described above indicate the same or similar parts, and thus description thereof will be omitted.

The tenth embodiment has a configuration substantially similar to that of the above-described sixth embodiment, as shown in FIG. 24. However, in the present embodiment, as shown in FIG. 24 and FIG. Both the shield plate 160 described in the embodiment and the side suction nozzle 70 described in the ninth embodiment are provided. That is, a shielding plate 160 for shielding the opening at the end of the suction port (suction opening) 40 a of the suction chamber 40 to suppress the suction from the end is provided with the thin film 2.
The shield plate 160 is movably mounted in the width direction of the
(That is, the end of the suction port 40a of the suction chamber 40)
Side suction nozzle 70 for sucking air from the side of the end
Is attached. The side suction nozzle 70 is connected to a vacuum pump 71, and the air at the end of the suction port 40 a of the suction chamber 40 is sucked from the side suction nozzle 70 by the vacuum pump 71.

Further, similarly to the eighth embodiment, as shown in FIG. 25, a long hole 160a is formed in the shielding plate 160, and penetrates the long hole 160a, and is connected to the suction chamber 40 through the washer 161. The shield plate 160 is attached to the suction chamber 40 by attachment bolts 162 that are fastened to the upper wall 41a. The shielding plate 160 can be moved in the width direction of the thin film 2 by the long holes 160, and the amount of shielding at the end of the suction port 40 a of the suction chamber 40 can be adjusted.

Although FIG. 25 shows only one end portion in the width direction of the device of the present embodiment, the other end portion has the same configuration. The casting apparatus for forming a thin film made of resin according to the tenth embodiment configured as described above basically operates in the same manner as the sixth embodiment. Therefore, here, the shielding plate 160 and the side suction Only the function and effect of the nozzle 70 will be described.

In this embodiment, as shown by the dotted arrows in FIG. 26, the suction operation of the side suction nozzle 70 causes the flow by suction into the side suction nozzle 70 to become the mainstream, and the suction plate by the shielding plate 160. By rectifying the suction into 40, the formation of dynamic pressure and vortex is suppressed, the vibration (oscillation) of the thin film 2 and the suction into the suction chamber 40 are suppressed, and stable thin film molding is performed with any resin. Becomes possible.

In particular, in the present embodiment, when a thin film is formed from a resin having a relatively low elongational viscosity, a great effect is exerted to stably adhere the thin film 2 to the casting roll 3. In this embodiment, the suction chamber 40 and the side suction nozzle 7 are also controlled by the vacuum pumps 5 and 71.
The airflow can be controlled by controlling the amount of air taken into the airbag 1 respectively.

[11] Description of Eleventh Embodiment FIGS. 27 and 28 are a side view and a front view, respectively, schematically showing a resin thin film casting apparatus as an eleventh embodiment of the present invention. In the eleventh embodiment, the casting apparatus of the above-described second embodiment is provided with a radial moving mechanism for adjusting the required sealing gap by moving the suction chamber 40 in the radial direction of the casting roll 3. In the figure, since the same reference numerals as those described above indicate the same or similar parts,
The description is omitted.

In the casting apparatus according to the eleventh embodiment, as shown in FIGS. 27 and 28, as a circumferential moving mechanism for moving the suction chamber 40 along the circumferential direction of the casting roll 3 while maintaining a required seal gap. , A guide frame (guide member) 13 is used. The guide frame 13 is a side frame 1 that supports the side end of the roll support shaft 16 of the casting roll 3.
7 is attached by an attachment bolt 12. The guide frame 13 guides the suction chamber 40 along the circumferential direction of the casting roll 3.
A long guide rail 13a is formed to engage two pins (or rolls) 11a attached to the side surface of the suction chamber 40.

In this embodiment, the mounting bolt 12
Guide frame 1 against side frame 17
By adjusting the mounting height position of 3, the required sealing gap between the outer peripheral surface of the casting roll 3 and the suction chamber 40 can be adjusted. That is, the above-described mounting bolt 12 functions as a radial moving mechanism.

In FIG. 28, only one end portion in the width direction of the apparatus according to the present embodiment is shown, but the other end portion has the same configuration. The gap between the lower surface of the T-die 1 and the upper surface of the suction chamber 40 is closed by the above-described elastic seal member 50 attached to the suction chamber 40. According to the casting apparatus for forming a thin film made of resin as the eleventh embodiment of the present invention configured as described above, only the configuration of the circumferential direction moving mechanism and the radial direction moving mechanism is different from the sixth embodiment. The same operation and effect as the embodiment can be obtained.

In the eleventh embodiment, any of the elastic seal members 50 and the metal leaf springs 56a to 56c shown in the fourth to seventh embodiments may be used.
The shielding plate 160 and the side suction nozzle 70 described in the tenth embodiment may be used. [12] Description of Twelfth Embodiment FIGS. 29 and 30 are a side view and a front view schematically showing a casting apparatus for forming a thin film made of resin according to a twelfth embodiment of the present invention.

In the twelfth embodiment, the casting apparatus of the third embodiment described above is provided with a radial moving mechanism for adjusting the required sealing gap by moving the suction chamber 40 in the radial direction of the casting roll 3. In the figure, the same reference numerals as those described above indicate the same or similar parts, and therefore, description thereof will be omitted. First
In the casting apparatus according to the second embodiment, as shown in FIGS. 29 and 30, a driving member 20 is used as a circumferential direction moving mechanism for moving the suction chamber 40 along the circumferential direction of the casting roll 3 while maintaining a required sealing gap. A guide frame (guide member) 23 is used.

The driving member 20 is rotatably supported on the base end thereof coaxially with the roll support shaft 3a so as to be rotatable around the roll support shaft 16 of the casting roll 3.
The guide frame 23 is attached to the front end of the “0” by a mounting bolt 22. The guide frame 23 has two pins (or rolls) 11a, 11a attached to the side surfaces of the suction chamber 40 in order to guide the suction chamber 40 along the circumferential direction of the casting roll 3.
A long hole-shaped guide rail 23a is formed.

In this embodiment, the mounting bolt 22
By adjusting the mounting height position of the guide frame 23 with respect to the driving member 20, the required sealing gap between the outer peripheral surface of the casting roll 3 and the suction chamber 40 can be adjusted. That is, the above-described mounting bolt 22 functions as a radial moving mechanism.

Although FIG. 30 shows only one end portion in the width direction of the apparatus according to the present embodiment, the other end portion has the same configuration. The gap between the lower surface of the T-die 1 and the upper surface of the suction chamber 40 is closed by the above-described elastic seal member 50 attached to the suction chamber 40. In the resin thin film molding casting apparatus according to the twelfth embodiment of the present invention configured as described above,
Similarly to the third embodiment, when the gap between the T-die 1 and the casting roll 3 is large, the suction chamber 40 is moved counterclockwise around the roll support shaft 16 by the driving member 20 to advance to an appropriate position. After performing the rough adjustment, the suction chamber 40 is moved along the elongated guide rail 23a of the guide frame 23 to perform fine adjustment for positioning the suction chamber 40 at a required position.
a is positioned near the contact start portion between the thin film 2 and the casting roll 3.

Conversely, the T-die 1 and the casting roll 3
If the gap between the suction chamber 40 and the guide frame 23 is small, the suction chamber 40 is moved clockwise around the roll support shaft 16 by the driving member 20 and retracted to an appropriate position. The fine adjustment is performed by moving along the long hole-shaped guide rail 23a and positioning it at a required position.

According to such a casting apparatus for forming a thin film made of resin as the twelfth embodiment of the present invention, the third
The same operation and effect as in the embodiment can be obtained, and the configuration of the circumferential direction moving mechanism and the radial direction movement mechanism is different from that of the sixth embodiment, and the same operation and effect as in the sixth embodiment can be obtained. Note that also in the twelfth embodiment,
Any of the elastic seal member 50 and the metal leaf springs 56a to 56c shown in the fourth to seventh embodiments may be used, and the shielding plate 160 and the side suction nozzle 70 shown in the eighth to tenth embodiments may be used. May be used.

[0113]

As described above in detail, according to the casting apparatus for forming a thin film made of resin of the present invention (claims 1 to 4), the suction chamber is separated from the die and provided independently of the die. The suction chamber moves along the circumferential direction of the cooling roll by a circumferential moving mechanism while maintaining a required seal gap with the cooling roll.

In the circumferential moving mechanism according to the second aspect, the suction chamber can be moved in the circumferential direction of the cooling roll by rotating the driving member about the rotation axis of the cooling roll. According to the third aspect, the cooling chamber can be moved in the circumferential direction by guiding the suction chamber along the guide member. Further, in the circumferential moving mechanism according to claim 4, by rotating the driving member about the rotation axis of the cooling roll and guiding the suction chamber along the guide member,
The suction chamber can be moved in the circumferential direction of the cooling roll.

Therefore, when the gap between the die and the cooling roll is large, the suction chamber is moved by the circumferential moving mechanism so that the suction port (opening) of the suction chamber is located at the contact start portion between the thin film and the cooling roll. By approaching, the required pressure reduction level is secured without depending on the size of the gap between the die and the cooling roll, and the pressure in the space between the thin film and the cooling roll can be stably reduced by the suction chamber. This makes it possible to properly set the gap between the die and the cooling roll for any resin,
There is an effect that required thin film characteristics are secured and the quality of the resin thin film can be greatly improved.

At this time, by interposing an elastic seal member between the die and the suction chamber, even if the size of the gap between the die and the cooling roll or the position of the suction chamber is changed, the change can be followed. The space between the die and the suction chamber can be closed by an elastic sealing member. Thereby, the airtightness of the reduced pressure space surrounded by the die, the thin film and the suction chamber can be ensured, and a required reduced pressure level can be reliably obtained in the reduced pressure space.

Further, the position of the suction chamber is changed by disposing the elastic sealing member over a width exceeding the entire width of the thin film and pressing the die with elastic force to close the die and the suction chamber. Even if this is done, the gap between the suction chamber and the die can be reliably and automatically closed by the elastic sealing member, so that the airtightness of the decompression space surrounded by the die, the thin film and the suction chamber can be ensured, and the decompression space can be secured. , The required reduced pressure level can be reliably obtained. In addition, when adjusting the position of the suction chamber to determine the optimal conditions to be performed prior to the start of the production operation of each thin film, vibration of the thin film caused by air flowing into the suction chamber from the gap between the suction chamber and the die is required. Therefore, the adjustment operation can be performed extremely easily, and the production operation can be immediately started immediately after the adjustment operation (claims 6 and 7).

On the other hand, according to the casting apparatus for forming a thin film made of resin according to claims 8 to 14, the suction chamber is provided in the circumferential direction and the radial direction of the cooling roll while maintaining a required sealing gap between the suction roll and the cooling roll. In addition to being movable, the seal gap between the suction chamber and the cooling roll can be adjusted, and the elastic seal member can seal the gap regardless of the size of the gap between the die and the suction chamber.

Therefore, regardless of the size of the gap between the die and the cooling roll, the space between the thin film and the cooling roll can be stably depressurized by the suction chamber. It is possible to appropriately set the gap between the die and the cooling roll, and there is an effect that required thin film characteristics are secured and the quality of the resin thin film can be greatly improved.

Further, a thin plate extruded from the die is provided by providing a shielding plate capable of shielding the end of the suction opening of the suction chamber and a suction nozzle for sucking air from the end of the suction opening of the suction chamber. The main flow of the flow by suction into the space formed by the cooling roll and the suction chamber is controlled, and the vibration (oscillation) of the thin film and the drawing of the thin film into the suction chamber can be suppressed. This also makes it possible to perform stable thin film forming (claims 15 to 17).

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a casting apparatus for forming a resin thin film as a first embodiment of the present invention.

FIG. 2 is a side view schematically showing a casting apparatus for forming a resin thin film as a second embodiment of the present invention.

FIG. 3 is a side view schematically showing a casting apparatus for forming a resin thin film as a third embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration and an attached state of an elastic seal member in a resin thin film molding casting apparatus as a fourth embodiment of the present invention.

FIG. 5 is a side sectional view showing a configuration and an attached state of an elastic seal member according to a fourth embodiment.

FIG. 6 is a side sectional view showing a mounting state of an elastic seal member according to a fourth embodiment.

FIG. 7 shows a casting device according to a fourth embodiment.
FIG. 7 is a side sectional view showing a state where elastic seal members having different sizes from those shown in FIG. 6 are mounted.

FIGS. 8A to 8C are side sectional views showing a configuration and an attached state of an elastic seal member in a resin thin film molding casting apparatus according to a fifth embodiment of the present invention.

FIG. 9 is a side view schematically showing a casting apparatus for forming a resin thin film as a sixth embodiment of the present invention.

FIG. 10 is a front view schematically showing a casting apparatus for forming a resin thin film as a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration and an attached state of an elastic seal member of a sixth embodiment.

FIG. 12 is a side sectional view showing a configuration and an attached state of an elastic seal member of a sixth embodiment.

FIG. 13 is a side sectional view showing a mounted state of an elastic seal member according to a sixth embodiment.

FIG. 14 is a side sectional view showing a state where an elastic seal member having a different size from that shown in FIG. 13 is mounted in the casting device of the sixth embodiment.

FIG. 15 is a schematic side view for explaining an operation example of the sixth embodiment.

FIG. 16 is a schematic side view for explaining an operation example of the sixth embodiment.

FIGS. 17 (a) to (c) are side sectional views showing a configuration and an attached state of an elastic seal member in a resin thin film molding casting apparatus as a seventh embodiment of the present invention.

FIG. 18 is a side view schematically showing a casting apparatus for forming a resin thin film as an eighth embodiment of the present invention.

FIG. 19 is a perspective view illustrating a configuration and an attached state of an elastic seal member and a shielding plate according to an eighth embodiment.

FIG. 20 is a diagram showing an inflow state of outside air in a cross section taken along line PP of FIG. 18;

FIG. 21 is a side view schematically showing a resin thin film molding casting apparatus according to a ninth embodiment of the present invention.

FIG. 22 is a perspective view illustrating a configuration and an attached state of an elastic seal member and a suction nozzle according to a ninth embodiment.

FIG. 23 is a diagram showing an inflow state of outside air in a cross section taken along line QQ in FIG. 21;

FIG. 24 is a side view schematically showing a casting apparatus for forming a resin thin film as a tenth embodiment of the present invention.

FIG. 25 is a perspective view illustrating a configuration and an attached state of an elastic seal member, a shielding plate, and a suction nozzle according to a tenth embodiment.

26 is a diagram showing a state of inflow of outside air in a cross section along the line RR in FIG. 24;

FIG. 27 is a side view schematically showing a resin thin film forming casting apparatus as an eleventh embodiment of the present invention.

FIG. 28 is a front view schematically showing a casting apparatus for forming a resin thin film as an eleventh embodiment of the present invention.

FIG. 29 is a side view schematically showing a casting apparatus for forming a resin thin film as a twelfth embodiment of the present invention.

FIG. 30 is a front view schematically showing a resin thin film molding casting apparatus according to a twelfth embodiment of the present invention.

FIG. 31 is a side view schematically showing a conventional casting apparatus for forming a thin film made of resin.

FIG. 32 is a front view schematically showing a conventional casting apparatus for forming a thin film made of resin.

FIG. 33 is a diagram showing an inflow state of outside air in a cross section taken along line SS in FIG. 31;

[Explanation of symbols]

Reference Signs List 1 T die (die) 2 Film or sheet thin film 3 Casting roll (cooling roll) 3a Roll support shaft (rotating shaft) 4 Suction chamber 4a Opening 4c Pin (or roll) 4d Seal gap 5 Vacuum pump 6 Elastic seal Body (elastic seal member) 7 Drive member (circumferential movement mechanism) 8 Guide member (circumferential movement mechanism) 8a Slotted guide rail 8b Side frame 9 Drive member (circumferential movement mechanism) 10 Guide member (circumferential movement mechanism) 10a Slotted guide rail 11 Support bolt (radial moving mechanism) 11a Pin (or roll; circumferential moving mechanism) 12 Mounting bolt (radial moving mechanism) 13 Guide frame (guide member; circumferential moving mechanism) 13a long Hole-shaped guide rail 16 Roll support shaft (rotary shaft) 20 Drive member (circumferential movement mechanism) 2 Mounting bolt (radial moving mechanism) 23 Guide frame (guide member; circumferential moving mechanism) 23a Slotted guide rail 40 Suction chamber (vacuum box) 40a Suction port (suction opening) 50 Elastic seal member 51 Elastic seal body 52 , 53 Mounting bracket (mounting tool) 56a, 56b, 56c Metal leaf spring (elastic sealing member) 70 Side suction nozzle 110 Driving member (circumferential moving mechanism) 110a Slot (radial moving mechanism) 160 Shielding plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Haruki Nakao 1 Nagoya City Nakamura-ku Iwazuka-cho character highway 1 Nagoya Equipment Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Daisuke Oi 1 Address: Mitsubishi Heavy Industries, Ltd., Nagoya Machine Works

Claims (17)

[Claims] 1. A die for extruding a molten resin as a thin film,
A cooling roll that pulls the thin film extruded from the die onto an outer peripheral surface, cools and feeds the thin film, and a suction chamber that sucks air between the thin film and the cooling roll so that the thin film is brought into close contact with the cooling roll. In the casting apparatus for forming a thin film made of resin, the suction chamber is installed independently of the die and with a required sealing gap between the cooling roll and the cooling chamber. A casting apparatus for forming a thin film made of resin, comprising a circumferential moving mechanism for moving the suction chamber along the circumferential direction of the cooling roll while maintaining a seal gap. And a driving member having a base end rotatably supported at a base end thereof around a rotation axis of the cooling roll and a suction chamber fixed to a front end side. The casting apparatus for forming a thin film made of resin according to claim 1, wherein: 3. The cooling apparatus according to claim 2, wherein the circumferential moving mechanism includes a guide member attached to a side frame that supports a side end of the cooling roll and guides the suction chamber along a circumferential direction of the cooling roll. The casting apparatus for forming a thin film made of resin according to claim 1, wherein: 4. A driving member having a base end side rotatably supported around a rotation axis of the cooling roll, the driving member having a circumferential end thereof,
The resin thin film according to claim 1, further comprising a guide member attached to a tip end of the driving member and guiding the suction chamber along a circumferential direction of the cooling roll. Casting equipment for molding. 5. An elastic seal member is interposed between the die and the suction chamber.
The casting apparatus for forming a resin thin film according to claim 4. 6. A rod-shaped elastic seal body which is disposed over a width exceeding the entire width of the thin film, and is formed of a foam material, and the entire surface thereof is covered with a glass cloth covered with aluminum foil. And a fitting for attaching the elastic seal body to the suction chamber or the die. The die and the suction chamber are brought into contact with each other by pressing the elastic seal body against the die or the suction chamber with elastic force. The casting apparatus for forming a thin film made of resin according to claim 5, wherein a gap between the castings is closed. 7. The resilient sealing member comprises a corrosion-resistant metal leaf spring disposed over a width of the thin film and attached to the suction chamber or the die.
6. The resin thin film according to claim 5, wherein a gap between the die and the suction chamber is closed by pressing the metal leaf spring against the die or the suction chamber with elastic force. Casting equipment for molding. 8. The apparatus according to claim 1, further comprising a radial moving mechanism for moving the suction chamber in a radial direction of the cooling roll to adjust the required seal gap.
The casting apparatus for forming a resin thin film according to the above. 9. The peripheral moving mechanism includes a driving member having a base end rotatably supported around a rotation axis of the cooling roll and a suction chamber fixed to a distal end side. 9. The casting apparatus for forming a thin film made of resin according to claim 8, wherein the radial moving mechanism is provided at a portion where the suction chamber is attached to the driving member. 10. The cooling device according to claim 1, wherein the circumferential moving mechanism includes a guide member attached to a side frame that supports a side end of the cooling roll and guides the suction chamber along a circumferential direction of the cooling roll. 9. The casting apparatus according to claim 8, wherein the radial moving mechanism is configured as a mechanism for moving the guide member in a radial direction of the cooling roll. 11. A driving member having a base end side rotatably supported around a rotation axis of the cooling roll, and a peripheral moving mechanism for attaching the suction chamber to a distal end side of the driving member. A guide member for guiding the cooling member along a circumferential direction thereof, and the radial moving mechanism is provided at a portion where the guide member is attached to the drive member. 9. The casting apparatus for forming a resin thin film according to claim 8, wherein: 12. The casting apparatus according to claim 8, wherein an elastic sealing member is interposed between the die and the suction chamber. . 13. A rod-shaped elastic seal body which is disposed over a width exceeding the entire width of the thin film, and is formed of a foam material, and the entire surface thereof is covered with a glass cloth covered with aluminum foil. And a fitting for attaching the elastic seal body to the suction chamber or the die. The die and the suction chamber are brought into contact with each other by pressing the elastic seal body against the die or the suction chamber with elastic force. 13. The casting apparatus for forming a thin film made of resin according to claim 12, wherein a gap is closed. 14. The elastic sealing member comprises a corrosion-resistant metal leaf spring disposed over the entire width of the thin film and attached to the suction chamber or the die. 13. The casting apparatus according to claim 12, wherein a gap between the die and the suction chamber is closed by pressing the die or the suction chamber with elastic force. 15. The resin thin film molding according to claim 12, wherein a shielding plate capable of shielding an end of the suction opening of the suction chamber is provided so as to be movable in a width direction of the thin film. Casting device. 16. The casting apparatus according to claim 12, further comprising a suction nozzle for sucking air from a side of an end of the suction opening of the suction chamber. 17. A shielding plate capable of shielding an end of a suction opening of the suction chamber is movably mounted in a width direction of the thin film, and air is blown from a side of an end of the suction opening of the suction chamber. The casting apparatus for forming a thin film made of resin according to claim 12, further comprising a suction nozzle for sucking.