KR20170020228A - Web guiding apparatus - Google Patents

Abstract

Disclosed is a web guiding apparatus which prevents wrinkles, sags, cracks in the shape of lines, and meandering of a web. A web-guiding roller (21) comprises: an airflow roller (28); and a pair of edge rollers (29) which are installed on both end units in an axial direction of the air flow roller (28). The air flow roller (28) is made of porous members, leaks air, which is discharged from a penetrating hole (27) of an inner tube (22), to permeate from an outer circumferential surface, forms an air layer in between the outer circumferential surface and a web (12), and supports the center unit in a widthwise direction of the web (12) by placing an air layer by a non-contact method. The edge rollers (29) support both side units of the web (29) in contact with the side units. The air flow roller (28) and the edge rollers (29) have the same external diameter, and are formed on the same plane.

Description

WEB GUIDING APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web guide apparatus for guiding the conveyance of the web in the longitudinal direction.

The production facilities for functional films such as magnetic tapes, photographic films and optical functional films are provided with a transporting device for transporting these elongated films (hereinafter sometimes referred to as a web). [0003] As a carrying device, for example, as disclosed in Japanese Patent Application Laid-Open No. 2014-101162, it is known that the entire web is lifted and transported. As described in Japanese Patent Application Laid-Open No. 2001-106402, for example, a stepped roller having both ends (widthwise opposite ends) larger in diameter than the central portion (widthwise central portion) The center portion of the web is floated, and both sides of the web are brought into contact with the rollers.

However, in the apparatus described in Japanese Patent Laid-Open Publication No. 2014-101162, there is a problem that the web being conveyed is "meandering" because the whole web is floated. On the other hand, in the apparatus described in Japanese Patent Application Laid-Open No. 2001-106402, since the end portion is in contact with the roller, the above-described problem of "skew" can be prevented. However, since the stepped roller is used, There has been a problem in that problems such as " wrinkles " and " sagging " and "

It is an object of the present invention to provide a web guide device capable of preventing problems such as " wrinkles " and " slacking " and "

The web guiding apparatus of the present invention includes a pair of contact supporting portions and a non-contact supporting portion provided between one and the other of the pair of contact supporting portions, and guides the conveying in the longitudinal direction of the web. The contact support portion contacts the both side portions of one side of the web and rotates in accordance with the conveyance of the web. The noncontact supporting portion has an air layer formed between the outer circumferential surface and the web by letting out air from the outer circumferential surface to support the center portion in the width direction of the web in a noncontact state via the air layer and the outer circumferential surface is formed flush with the main surface of the contact supporting portion.

It is preferable that the non-contact supporting portion is formed of a porous member having air permeability.

The porous member is preferably at least one of a ceramic sintered body, a porous metal, and a porous plastic.

It is preferable that the contact support portion is rotated by a frictional force with the web.

And a rotation force supply unit for supplying a rotation force to the contact support unit, and the contact support unit is preferably rotated by the rotation force supplied from the rotation force supply unit.

In the case where the thickness of the web is in the range of 40 탆 or less, the web guide apparatus described above has a remarkable effect.

It is preferable that the web is separated from the non-contact supporting portion at a predetermined spacing position, and the non-contact supporting portion flows out the outflow air flowing out from the outer circumferential surface toward the web at the above-

According to the present invention, it is possible to prevent the problem of " skewing " occurring when the whole web is floated, and also to prevent " wrinkles " and " sagging " can do.

The above objects and advantages will be easily understood by those skilled in the art by reading the detailed description of the preferred embodiments with reference to the accompanying drawings.
1 is an explanatory view schematically showing a web transfer apparatus;
2 is a perspective view showing a configuration of a web guide apparatus.
3 is an exploded view of a web guide roller.
4 is a sectional view showing a section perpendicular to the axis of the web guide roller.
5 is a cross-sectional view showing an axial cross section of the web guide roller.
6 is a sectional view showing a section perpendicular to the axis of the web guide roller.
7 is a perspective view showing a configuration of a web guide apparatus.
FIG. 8 is an explanatory view schematically showing a solution deposition apparatus; FIG.

1, the web transfer apparatus 10 is provided with a feeding section 13, a coating section 14, a drying section 15, and a winding section 17. The feeding section 13 continuously loosens the web 12 from the fabric roll 11 which is turned in a coil shape. The application section 14 forms a functional coating film such as a magnetic coating film, a photosensitive coating film, and an optical functional coating film by coating a surface of the web 12 with a functional material. The drying unit 15 dries the coated film. The winding section 17 winds the web 12 (hereinafter sometimes referred to as a wet film 16a and a dry film 16b) having a coated film in a coil shape again.

The web 12 is a flexible support, for example, 100 mm or more and 3000 mm or less in width and 100 m or more and 9000 m or less in length. Examples of the material of the web 12 include polyethylene terephthalate (hereinafter sometimes referred to as PET), polyethylene-2,6-naphthalate, cellulose diacetate, cellulose triacetate, cellulose acetate propionate, polyvinyl chloride, Plastic films such as vinylidene, polycarbonate, polyimide and polyamide; paper; Polyolefins having 2 to 10 carbon atoms such as polyethylene, polypropylene and ethylene butene polymer; Metal foil such as aluminum, copper, and tin; .

The winding section 17 is provided with a motor 18 and a motor control section (conveyance control section) The motor 18 is connected to a take-up shaft 17a around which the web 12 is wound and is driven and controlled by the motor control unit 19 to rotate the take-up shaft 17a. The rotation of the take-up shaft 17a causes the web 12 to be transported from the feeding portion 13 toward the winding portion 17. As described above, the motor control unit 19 functions as a conveyance control unit for controlling the conveyance of the web 12.

The conveying speed of the web 12 can be set freely, but it is preferable that the conveying speed is 1 m / min or more and 200 m / min or less. Further, as will be described later, when the conveying speed of the web 12 is high, there is a possibility that the web 12 being conveyed is likely to be ratted. Conversely, if the conveying speed of the web 12 is low, there is a possibility that the web 12 being conveyed is damaged. Therefore, the conveying speed of the web 12 is more preferably 10 m / min or more and 100 m / min or less.

A motor for rotating the winding shaft 13a around which the fabric roll 11 is wound may be provided and the motor may be controlled by the motor control unit 19 in the same manner as the motor 18. [ Since the web conveying apparatus 10 is provided with a plurality of rollers for guiding the conveyance of the web 12, such as a web guide roller 21 described later, a motor for rotating these rollers is provided, As shown in Fig.

A web guide device (20) is provided between the application part (14) and the drying part (15). The web guide apparatus 20 includes a web guide roller 21, a blower 25 and a blowing control unit 26. The web 12 is guided by a web guide roller 21, (15). The web 12 is wrapped around the web guide roller 21 between the application portion 14 and the drying portion 15 so that the lower surface in Fig. 1 is supported by the web guide roller 21, And is conveyed to the drying section 15 by a crest-shaped conveyance path having the crest 21 as the apex.

2 to 5, the web guide roller 21 includes an inner tube 22 fixed to a support portion (not shown), and a pair of guide rollers 23, which are rotatably supported on the outer side of the inner tube 22 via a bearing 23 And an outer tube 24 attached thereto.

A pipe (not shown) from the blower 25 is connected to both ends of the inner tube 22. The blower 25 is driven and controlled by a blowing control unit (air amount control unit) 26, and supplies air to the inside of the inner tube 22 through a pipe. The inner tube 22 is provided with a plurality of through holes 27 penetrating the side wall. Air supplied from the air blower 25 is discharged from the through hole 27. In this embodiment, the web 12 is wrapped around the web guide roller 21 in an angular range of 90 degrees above the web guide roller 21 (see Fig. 4). In the present embodiment, through holes 27 are provided in an angle range of 90 degrees on the upper side of the inner tube 22 so as to discharge air toward this range.

The outer tube 24 has an air flow roller 28 and a pair of edge rollers (contact supporting portions) provided at both ends of the air flow roller 28 in the axial direction (the width direction of the web 12) (29).

The air flow roller 28 is made of a member having air permeability. Examples of members having air permeability include porous members having an open cell structure, and more specifically, ceramic sintered bodies, porous metals, and porous plastics. The air flow roller 28 forms an air layer between the outer circumferential surface and the web 12 by allowing the air discharged from the through hole 27 of the inner tube 22 to flow out from the outer circumferential surface of the air flow roller 28, And supports the central portion (widthwise central portion) of the web 12 in a noncontact state via the air layer. Thus, the air flow roller 28 is the non-contact supporting portion of the present invention.

The air flow roller 28 may be composed of only one kind of the above-described air permeable member, or may be a combination of plural kinds of members having air permeability. It is also possible to use airflow rollers in which air permeability is imparted by providing a plurality of through holes on the side wall of the tubular member like the through holes 27 of the inner tube 27. [

However, in the present invention, as described later, the thickness of the air layer formed between the outer periphery of the air float roller 28 and the web 12 can be reduced to the limit, (Hereinafter sometimes referred to as outflow air) may be a little, if air can pass through the air flow roller 28 from the inside to the outer circumferential surface without resistance, the supply amount of the outflow air is increased more than necessary Throw away.

Therefore, it is preferable that the flow path of the outflow air is small and complicated (not linear) so that the resistance of the outflow air from the inside to the outer circumferential surface of the air flow roller 28 becomes a resistance. Specifically, when a through hole is provided in the air flow roller 28, it is preferable that the diameter of the through hole is 100 탆 or less. In the case of constructing the air flow roller 28 using the porous member, it is preferable that the average pore diameter is 60 탆 or less (# 200), and more preferably 30 탆 or less (# 400). Examples of the porous member include ceramics such as alumina, metal such as stainless steel, and plastic. The porous member may be selected depending on the diameter of the hole, the size of the material, and the price.

On the other hand, the edge roller 29 is a contact support portion of the present invention which supports both side portions of the web 12 in contact with each other, unlike the air flow roller 28. The edge roller 29 is formed of a roller surface in contact with the web 12, such as stainless steel, ceramic, super hard alloy, hard chrome plating, anodized aluminum, or the like. The outer tube 24 rotates in accordance with the conveyance of the web 12 by the frictional force between the edge roller 29 and the web 12.

Further, the edge roller 29 does not need to have air permeability unlike the air flow roller 28. However, in order to more reliably prevent the web 12 from slipping on the surface of the edge roller 29 and causing the web 12 to " skew " due to the small frictional force with the web 12, At least the surface of the roller 29 may be formed of a porous member and the frictional force between the web 12 and the edge roller 29 may be increased by the irregularity caused by the hole of the porous member. Of course, the frictional force between the web 12 and the edge roller 29 may be increased by performing concave-convex processing or grooving such as satin or dimple on the surface of the edge roller 29 by blasting.

The outer tube 24 is formed so that the boundary between the airflow roller 28 and the edge roller 29 is flat, that is, the airflow roller 28 and the edge roller 29 have the same outer diameter, The surfaces of the edge rollers 29 are formed in the same plane (see Fig. 5). By doing this, it is possible to prevent the problem that "wrinkles", "sagging" and "line-shaped flaws" are formed in the boundary between the air flow roller 28 and the edge roller 29 or in the vicinity of the web 12 have. Further, in the present invention, since both side portions of the web 12 are held in contact with each other, " skewing " of the web 12 can be prevented.

In the web transporting apparatus 10 having the web guide rollers 21 as described above, the web 12 is released from the raw roll 11 from the feeding section 13 and transported to the application section 14. In the application section 14, a functional material is coated on the surface of the conveyed web 12, and is conveyed toward the web guide roller 21 as a wet film 16a.

The wet film 16a is conveyed to the drying section 15 by the web guide roller 21. The wet film 16a conveyed to the drying section 15 is dried in the drying section 15 to become the dry film 16b and wound in the form of a coil in the winding section 17 again. The coil-shaped, i.e., roll-shaped, dry film 16b is transferred to the next processing step and processed into a product.

In the above embodiment, the web guide roller 21 is an example of a pre-rotation roller that is rotated following the conveyance of the web 12 by the frictional force with the web 12. However, The web guide roller 21 may be rotated by supplying a rotational force to the web guide roller 21. [ In this case, a control unit that rotates the web guide roller 21 so that the difference in speed between the movement speed of the outer peripheral surface of the web guide roller 21 and the conveyance speed of the web 12 is 1% or less, It is desirable to install it.

It is needless to say that even when the web guide roller 21 is a free rotation roller as in the above embodiment, the web guide roller 21 is rotated in the range of the speed difference between the moving speed of the outer peripheral surface of the web guide roller 21 and the web conveying speed, (21) is rotated. In this case, the frictional force with respect to the web 12, specifically, the web guide roller 21 (in particular, the width of the web guide roller 21) (29), the conveying tension of the web 12, and the like.

The width of the air flow roller 28 and the edge roller 29, that is, the width of the non-contact supporting portion and the contact supporting portion, can be freely set. The sum of the widths of both side portions of the web 12 that are in contact with the contact supporting portion is preferably 0.5% or more and less than 5%, more preferably 1% or more and less than 3% of the entire width of the web 12 . By making the total of the widths of both side portions of the web 12 contacting with the contact supporting portion less than 5%, the occurrence of " scratching " or the like accompanying the conveyance is more reliably reduced as compared with the case of 5% A larger usable area can be secured as a product. On the other hand, by setting the sum of the widths of both side portions of the web 12 that are in contact with the contact support portion to 0.5% or more, the effect of preventing the web from " skewing "

The thickness of the air layer formed between the web 12 and the non-contact supporting portion can be freely set. In the present invention, since the non-contact supporting portion and the contact supporting portion are on the same plane, the center portion of the web 12 is held in a non-contact manner by using a so-called stepped roller having a diameter smaller than the outer diameter of both side portions, It is not necessary to make the thickness of the air layer formed between the non-contact supporting portion and the web 12 equal to the height of the stepped portion of the stepped roller as compared with the case of supporting both sides of the web 12 in contact with each other. Therefore, in the present invention, it is preferable that the thickness of the air layer is as small as possible to the extreme, more specifically, in the range of more than 0 탆 and less than 15 탆. By reducing the thickness of the air layer in this manner, it is possible to suppress the amount of air (volume of air supplied per unit time) supplied to float the web 12. Further, by thinning the thickness of the air layer, it is also possible to suppress the " rattle ring (vibration in the direction perpendicular to the surface of the web) "

The air layer formed between the web 12 and the non-contact supporting portion includes not only outflow air flowing out of the non-contact supporting portion but also air flowing along the web 12 along the web 12 in accordance with the conveyance of the web 12. [ (Hereinafter referred to also as accompanying air) (the air layer is composed of the outflow air and the accompanying air). As described above, according to the present invention, since the thickness of the air layer can be made thinner to the extreme as described above, almost all of the air layer is constituted by the accompanying air, more specifically, the air amount of the outflow air constituting the air layer is set to 5 % Or less, and the supply amount of the outflow air can be suppressed.

When the conveying speed of the web 12 is high, the air amount of the accompanying air is increased to increase the thickness of the air layer, and when the web 12 is conveyed at a high speed, The amount of air in the associated air is reduced and the thickness of the air layer is reduced. The greater the thickness of the air layer, that is, the faster the conveyance speed of the web 12, the more likely the " rattle ring " Conversely, the thinner the thickness of the air layer, that is, the slower the conveying speed of the web 12, the more likely the web 12 in contact with the roller is damaged due to contact with the roller. Therefore, from the viewpoint of stabilizing the thickness of the air layer, the conveying speed of the web 12 is preferably 10 m / min or more and 100 m / min or less.

As described above, the air layer formed between the web 12 and the non-contact supporting portion includes the outflow air and the accompanying air. The amount of air in the outflow air changes in accordance with the amount of air blown from the blower 25, (I.e., the rotational speed of the motor 18). That is, the blowing control unit 26 for controlling the blower 25 also functions as an air amount control unit for controlling the amount of air in the outflow air constituting the air layer. The motor control unit 19 for controlling the motor 18, that is, the conveyance control unit, also functions as an air amount control unit for controlling the amount of air in the air constituting the air layer.

Further, the thickness of the air layer changes in accordance with the amount of air in the outgoing air or the accompanying air, so that the airflow control unit 26 and the motor control unit 19 also function as an air layer thickness control unit for controlling the thickness of the air layer. When controlling the thickness of the air layer, by controlling both the amount of air in the outflow air (the amount of air supplied by the blower 25) and the amount of air in the accompanying air (the rotational speed of the motor 18) The thickness of the air layer may be controlled to a desired thickness by controlling the other side to be constant.

Further, the present invention achieves a more remarkable effect when guiding the transport of a relatively thin web having a thickness of 40 占 퐉 or less, more preferably 16 占 퐉 or less. That is, when the whole web is supported in a noncontact manner as in the prior art, the web is more likely to be " ratted " as the thickness of the web becomes thinner. Further, when the central portion of the web is supported in a noncontact manner by using the stepped rollers as in the prior art, and both side portions of the web are supported in contact with each other, as the thickness of the web becomes thinner, Or " sagging ", and " sagging " are liable to occur. On the contrary, the present invention can prevent the conventional problems even when the thickness of the web is thin.

Further, the present invention achieves a more remarkable effect when the web is wrapped around the web guide roller and the web has a relatively high conveying tension of 200 N / m or more and 300 N / m or more. That is, in the case of using the stepped bearing roller as in the prior art, "wrinkles", "sagging" and "stripe scratches" are liable to occur at the boundary between the contact supporting portion and the non- On the other hand, in the present invention, since the contact support portion and the non-contact support portion are formed on the same plane, the above-described problem can be prevented even when the transfer tension is high.

Further, the present invention achieves a more remarkable effect when the conveying tension of the web is relatively low such as 50 N / m or less and 20 N / m or less. That is, in the case of transporting the entire web by lifting the web as in the prior art, the web tends to be "skewed" as the transport tension is lowered. On the other hand, according to the present invention, since only the center portion of the web floats and both side portions are held in contact with each other, the aforementioned problem can be prevented even when the conveying tension is low. The above-mentioned conveying tension expressed in units of " N / m " means a force in the longitudinal direction given per 1 m width of the web.

In the above-described embodiment, the web 12 is wrapped around the web guide roller 21 in an angle range of 90 degrees above the web guide roller 21. However, the scope of winding the web 12 is not limited to this, . In the above embodiment, the outflow air flows out from the region where the web 12 is wound around the web guide roller 21, but the present invention is not limited to this. For example, the above-described through hole 27 (see Figs. 3 to 5) may be provided over the entire circumference of the inner tube 22, and the web guide roller may be configured so that the outflow air flows out from the entire circumference.

Conversely, the configuration may be such that the outflow air flows out from only a part of the region where the web 12 is wound around. In this case, it is preferable to let the outflow air flow out from the web guide roller 30 toward the web 12 at the spaced-apart position P1, like the web guide roller 30 shown in Fig. In the explanation using the drawings after FIG. 6, the same reference numerals are given to members similar to those of the above-described embodiment, and the description thereof is omitted.

6, the web 12 is wrapped around the upper side of the web guide roller 30 in an angular range of 90 degrees, as in the above-described embodiment. That is, in the example of Fig. 6, the temporary position P1 at which the web 12 is separated from the web guide roller 30 is set to the counterclockwise direction (45 DEG). 6, a through hole 27 is formed in the inner tube 22 so as to allow the outflow air to flow out from an angular range of 20 degrees about the dislocation position P1.

As described above, in the present invention, the air layer formed between the web 12 and the airflow roller 28 can be made as thin as possible. The air layer also includes accompanying air flowing along with the conveyance of the web 12. In the present invention, almost all of the air layer can be constituted by the accompanying air. On the other hand, when the web 12 is separated from the air flow roller 28 in the vicinity of the temporary position P1, the pressure of the air constituting the air layer is lowered and the web 12 is moved to the air flow roller 28 There is a possibility that they are in contact with each other. On the other hand, by arranging the outflow air to flow out toward the web 12 at the temporary position P1 as shown in Fig. 6, it is possible to prevent the aforementioned problem, that is, contact between the web 12 and the airflow roller 28 . In the example of Fig. 6, the supply amount of the outflow air can be suppressed as compared with the configuration in which the outflow air flows out from the entire region where the web 12 is wound around, for example.

In the above embodiment, the air flow roller 28 and the edge roller 29 are integrated and rotated together. However, the present invention is not limited to this. For example, as shown in Fig. 7, only the edge roller 29 may be rotated. 7, the web guide device 31 is an example in which the above-described air flow roller 28 (see Figs. 2 and 3) is replaced with (replaced with) the main body 32. Fig. The body portion 32 is a noncontact supporting portion of the present invention in which the upper portion is constituted by a porous member and the air supplied to the inside by the blower 25 flows out from the upper portion. The main body portion 32 is, for example, a bottom surface fixed to the floor or the like.

At both ends of the main body 32, a support shaft 32a is provided. An edge roller 29 is attached to the support shaft 32a and is rotatably supported. Even if such a configuration, that is, a configuration in which the noncontact supporting portion is not rotated, the same effect as in the above-described embodiment can be obtained. Further, when the noncontact supporting portion is not rotated, the air amount of the associated air constituting the air layer is reduced, as compared with the case where the noncontact supporting portion rotates. Therefore, when the non-contact support portion is configured not to rotate, it is possible to prevent the contact between the web 12 and the non-contact support portion by increasing the supply amount of the outflow air or increasing the conveyance speed of the web 12 desirable.

In the above-described embodiment, an example in which accompanying air is naturally generated by the conveyance of the web 12 has been described. However, not only such a naturally occurring air accompanied by such air, but also forcibly generating from the blower . That is, a blower for generating accompanying air may be provided. By providing the blower for generating the accompanying air in this manner, it is possible to supply a stable amount of the accompanying air even in a situation where the accompanied air is insufficient. Examples of situations in which the accompanying air is insufficient include a case where the conveying speed of the web 12 is low, specifically, a conveying speed of the web 12 is 50 m / min or less and 20 m / min or less. A situation in which the accompanying air is insufficient is a case in which the noncontact supporting portion does not rotate as in the example of Fig.

Further, when a blower for forcibly generating accompanying air is provided as described above, a control unit for controlling the blower functions as an air amount control unit for controlling the air amount of the accompanying air. When a blower forcibly generating the accompanying air is provided, the control unit for controlling the blower also functions as an air layer thickness control unit for controlling the thickness of the air layer formed between the web 12 and the non-contact supporting unit.

The present invention also relates to a production facility for producing a functional film by applying a functional material to a base film (web) as described above, as well as a process for producing a base film itself or a solution for directly producing a functional film The present invention can be applied to a film-forming apparatus or a melting-film-forming apparatus.

The web guided by the web guiding device of the present invention in the solution film-forming process is a so-called wet film obtained by soaking a solvent after being peeled from a support (flow casting support) and a dried film after drying In some cases). In the solution film-forming equipment, a dope containing a polymer and a solvent is softened to a flexible support to form a flexible film on the flexible support, and the flexible film is peeled off as a film from the flexible support. Since the peeled film is faded with the solvent, the solvent is evaporated to dry the film. The dried film is wound in a winding device so as to be in the form of a roll, or sent to the next process. As an apparatus for carrying out the next process, for example, the web transfer apparatus 10 shown in Fig. 1 can be mentioned. The web guided by the web guiding apparatus of the present invention in the melt film formation is a film extruded into a thin film by melting a raw material polymer by a melt extruder.

The wet film in the solution film formation is a solvent and is heated to promote drying. Further, when the film in the melt film is extruded from a melt extruder, it is at a high temperature of about melting point. As described above, even when the web guide of the present invention is used to guide a web having a solvent or a high-temperature web, the same effects as those of the above-described embodiment can be obtained.

Hereinafter, as an example of an embodiment using the web guide device of the present invention in a film-forming apparatus, a description will be given of a case in which a web guide roller 21 is used in a solution film-forming apparatus with reference to FIG.

[Raw material]

As a raw material for the dope 51, known polymers and solvents capable of producing a film by solution casting can be used. Of the polymers, cellulose acylate and cyclic polyolefin can be preferably used. Any of these polymers is basically the same in terms of the structure of the production facility and the flow of the production process. Therefore, the case where the cellulose acylate film is used as the polymer component will be described below as an example.

Among the cellulose acylates, the ratio of the esterification of the hydroxyl group of cellulose with the carboxylic acid, that is, the degree of substitution of the acyl group (hereinafter referred to as the acyl group substitution degree) satisfies all the conditions of the following formulas (I) to (III) desirable. In the general formulas (I) to (III), A and B are both an acyl group substitution degree, the acyl group in A is an acetyl group, and the acyl group in B has 3 to 22 carbon atoms.

2.5? A + B? (I)

0? A? 3.0 ... (II)

0? B? 2.9? (III)

The glucose unit constituting cellulose and having a? -1,4 bond has a free hydroxyl group at 2-position, 3-position and 6-position. The cellulose acylate is a polymer (polymer) in which some or all of these hydroxyl groups are esterified and the hydrogen of the hydroxyl group is substituted with an acyl group having 2 or more carbon atoms. When the esterification of one hydroxyl group in the glucose unit is 100%, the degree of substitution is 1. Therefore, in the case of cellulose acylate, if the hydroxyl groups at the 2-position, the 3-position and the 6-position are each esterified to 100% .

Here, the substitution degree of the acyl group at the 2-position of the glucose unit is DS2, the substitution degree of the acyl group at the 3-position is DS3, and the substitution degree of the acyl group at the 6-position is DS6. The substitution degree of all the acyl groups obtained by DS2 + DS3 + DS6 is preferably 2.00 to 3.00, more preferably 2.22 to 2.90, and even more preferably 2.40 to 2.88. Further, DS6 / (DS2 + DS3 + DS6) is preferably 0.28 or more, more preferably 0.30 or more, and further preferably 0.31 to 0.34.

The acyl group may be only one kind, or two or more types. When two or more kinds of acyl groups are present, one of them is preferably an acetyl group. The sum of substitution degrees of acetyl groups of hydrogen in the hydroxyl groups at the 2-position, the 3-position and the 6-position is defined as DSA, and the sum of substitution degrees by the acyl groups other than the acetyl groups at the 2-position, , The value of DSA + DSB is preferably 2.22 to 2.90, particularly preferably 2.40 to 2.88. The DSB is preferably 0.30 or more, particularly preferably 0.70 or more. It is preferable that 20% or more of the DSB is a substituent of the 6-position hydroxyl group, more preferably 25% or more, more preferably 30% or more, particularly preferably 33% desirable. The value of DSA + DSB at the 6-position of the cellulose acylate is preferably 0.75 or more, more preferably 0.80 or more, and particularly preferably 0.85 or more. By using the cellulose acylate as described above, it is possible to produce a dope with favorable solubility and a dope with low viscosity and good filtration property. Particularly, when a non-chlorine-based organic solvent is used, the above-mentioned cellulose acylate is preferable.

The acyl group having 2 or more carbon atoms may be an aliphatic group or an aryl group and is not particularly limited. For example, an alkylcarbonyl ester, an alkenylcarbonyl ester, an aromatic carbonyl ester, or an aromatic alkylcarbonyl ester of cellulose, and these may each have a substituted group. Propanoyl group, butanoyl group, pentanoyl group, hexanoyl group, octanoyl group, decanoyl group, dodecanoyl group, tridecanoyl group, tetradecanoyl group, hexadecanoyl group, octadecanoyl group, iso-butanoyl group, t -Butanoyl group, cyclohexanecarbonyl group, oleyl group, benzoyl group, naphthylcarbonyl group, cinnamoyl group and the like. Of these, a propionyl group, a butanoyl group, a dodecanoyl group, an octadecanoyl group, a t-butanoyl group, an oleyl group, a benzoyl group, a naphthylcarbonyl group and a cinnamoyl group are more preferable, and a propionyl group, Is particularly preferable.

The details of the cellulose acylate are described in the paragraphs [0140] to [0195] of Japanese Patent Application Laid-Open No. 2005-104148, which are also applicable to the present invention.

Examples of the solvent for producing the dope 51 include aliphatic hydrocarbons such as aromatic hydrocarbons such as benzene and toluene and halogenated hydrocarbons such as dichloromethane, chloroform and chlorobenzene; alcohols such as methanol and ethanol; (such as acetone, methyl ethyl ketone and the like), esters (such as methyl acetate, ethyl acetate and acetic acid propyl), and ethers (such as methyl ethyl ketone and the like), n-butanol And tetrahydrofuran, methyl cellosolve, etc.) and the like. Here, the dope is a polymer solution or dispersion obtained by dissolving the polymer in a solvent or dispersing it in a dispersion medium.

As the solvent, halogenated hydrocarbons having 1 to 7 carbon atoms are particularly preferable, and dichloromethane is most preferable. From the viewpoints of the solubility of the cellulose acylate, the peeling property of the flexible film from the support, the mechanical strength of the film, and the optical properties of the film, one or several kinds of alcohols having 1 to 5 carbon atoms are dissolved in dichloromethane It is preferable to use them in a mixed manner. At this time, the content of the alcohol is preferably 2% by weight to 25% by weight, more preferably 5% by weight to 20% by weight, based on the whole solvent. Specific preferred examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol and the like. Among them, methanol, ethanol, n-butanol or a mixture thereof is preferably used.

When it is aimed to minimize the influence on the environment, the dope may be produced without using dichloromethane. As the solvent in this case, an ether having 4 to 12 carbon atoms, a ketone having 3 to 12 carbon atoms, and an ester having 3 to 12 carbon atoms are preferable, and these solvents may be suitably mixed and used. These ethers, ketones and esters may have a cyclic structure. Further, a compound having two or more functional groups of ether, ketone and ester (i.e., -O-, -CO- and -COO-) can also be used as a solvent. The solvent may be, for example, one having another functional group such as an alcoholic hydroxyl group in its chemical structure.

Various known additives such as a plasticizer, an ultraviolet absorber (UV agent), a deterioration inhibitor, a slip agent and a release promoter may be added to the dope 51 according to the purpose. For example, known plasticizers such as phosphate ester plasticizers such as triphenyl phosphate and biphenyl diphenyl phosphate, phthalic acid ester plasticizers such as diethyl phthalate, and polyester polyurethane elastomers can be used as the plasticizer .

The dope 51 having a cellulose acylate concentration of 5 wt% or more and 40 wt% or less is prepared using the raw materials described above. The cellulose acylate concentration is more preferably in the range of 15 wt% or more and 30 wt% or less, and more preferably in the range of 17 wt% or more and 25 wt% or less. The concentration of the additive is preferably in the range of 1 wt% to 20 wt% with respect to the total solid content.

With respect to the production of the dope 51, the method of dissolving the raw material, the filtration method, the defoaming and the addition method are described in detail in paragraphs [0517] to [0616] of Japanese Patent Application Laid-Open No. 2005-104148 , And the contents of these references are also applicable to the present invention.

[Film production method]

8 is a schematic view of the solution deposition equipment 50. Fig. However, the present invention is not limited to this solution film-forming equipment 50. The solution film-forming equipment 50 is provided with a flexible chamber 53, a first drying chamber 56, a tenter 57, a corner cutting device 58, a second drying chamber 61, a cooling chamber 62, A static eliminator 63, a pair of nulling rollers 66, and a winding unit 67 are provided. The flexible chamber 53 is made of a wet film (web) 52, which is a cellulose acylate film in which the dope 51 in which the cellulose acylate is dissolved in the solvent is softened. The first drying chamber (56) dries while conveying the wet film (52). The tenter 57 holds the both end portions of the wet film 52 coming out of the first drying chamber 56 and dries while conveying the wet film 52 in a state where it is held. A corner cutting device 58 cuts both ends of the wet film 52. The second drying chamber 61 is made of a cellulose acylate film (web of the present invention, hereinafter simply referred to as a film) 59 in which the wet film 52 is conveyed while being dried, The cooling chamber (62) is for cooling the film (59). The static eliminator 63 is for reducing the amount of charge of the film 59. The knurling-imparting roller pair 66 embosses the side end portion of the film 59. The winding section (67) winds the film (59).

The flexible chamber 53 is provided with a flexible die 71 for discharging the dope 51 and a band 72 as a flexible support. The flexible die 71 is preferably a coat hanger type die.

The band 72 as the flexible support is wound around the backup roller 73 rotating in the circumferential direction and continuously runs by the rotation of the backup roller 73. [ The backup roller 73 is provided with a drive means (not shown), and the backup roller 73 is rotated by this drive means.

The backup roller 73 is internally formed with a passage (not shown) through which the heat transfer medium passes. A heat transfer medium circulating device (not shown) is connected to the backup roller 73. This heat transfer medium circulating device circulates and supplies the heat transfer medium to the above-mentioned flow path by controlling the temperature of the heat transfer medium. As a result, the circumferential surface temperature of the backup roller 73 is controlled and the temperature of the band 72 contacting the backup roller 73 is set to a predetermined value. The temperature of the band 72 is appropriately set in accordance with the kind of the solvent, the kind of the solid component, the concentration of the dope 51, and the like.

Flexible beads are formed from the flexible die 71 to the band 72 and a flexible film 78 is formed on the band 72. [ A pressure reducing chamber (76) is provided on the upstream side of the flexible bead. The area on the upstream side is reduced with respect to the flexible bead to stabilize the shape of the flexible bead.

The flexible chamber 53 is provided with a temperature adjusting device 77 for maintaining the internal temperature at a predetermined value and a condenser for condensing and recovering the solvent evaporated from the dope 51 and the flexible film 78 Is installed. A recovery device (not shown) for recovering the condensed and liquefied solvent is provided outside the flexible chamber 53. The solvent recovered by the recovery device is regenerated and reused as a solvent for producing the dope.

The flexible chamber 53 is provided with a peeling roller 85 for supporting the wet film 52 for peeling the flexible film 78 from the band 72. The flexible film 78 is dried until it has a self-supporting property and is peeled off from the band 72. The weight of the residual solvent in the flexible film 78 at the time of peeling is preferably 10 to 200 when the weight of the solid is 100.

Instead of the band 72 and the backup roller 73, a drum rotating in the circumferential direction may also be used. In this case, the flexible film 78 is gelled by cooling to have self-supporting property. By drying while cooling, the peeling timing can be made faster.

The first drying chamber 56 is provided with a blower (not shown). The temperature of the drying wind from the blower is preferably in the range of 20 캜 to 250 캜. The first drying chamber 56 is provided with a web guide roller 21 for guiding the wet film 52 to the tenter 57. Thus, the "wetting" of the wet film 52 (web) can be suppressed and the wet film 52 can be stably transported. In addition, there is no case such as "wrinkles", "sagging" or "line-shaped scratches" at the boundary between the air flow roller 28 (non-contact supporting portion) and the edge roller 29 . A plurality of web guide rollers 21 may be provided in the first drying chamber 56. Further, all of the plurality of rollers provided in the conveying path of the first drying chamber 56 may be the web guide roller 21 or only the web guide roller 21.

In the first drying chamber 56, with respect to a plurality of rollers disposed on the conveying path, the rotation speed of the roller on the downstream side is made higher than the rotation speed of the roller on the upstream side, Tension), that is, tension in the transport direction can be given. Thus, sagging or deformation of the wet film 52 can be prevented.

In the first drying chamber 56, the wet film 52 is conveyed in the up-and-down-amplitude path by sequentially wrapping the wet film 52 on the rollers disposed upside down. However, the present invention is not limited thereto It does not. For example, a plurality of rollers may be horizontally disposed on the lower surface side of the wet film 52 so as to support the lower surface of the wet film 52, while the transport path of the wet film 52 in the first drying chamber 56 is horizontal, .

Further, an air blower for blowing dry air for drying the first wet room 55 by evaporating the solvent from the wet film 52 may be provided in the first drying room 56. In this case, since the solvent is less likely to evaporate than the surface of the wet film 52 opposite to the surface facing the band 72, the wet film 52 is formed on the surface of the wet film 52 facing the band 72 It is preferable to blow dry air. Although the first drying chamber 56 is provided in this embodiment, it is not necessary to provide the first drying chamber 56. That is, even if the tenter 57 described later is disposed immediately after the backup roller 73 do.

Both ends of the wet film 52 sent to the tenter 57 are held by a holding means (not shown) and conveyed by the movement of the holding means. Then, it is dried during this conveyance. As the holding means, there are a clip for gripping the side end portion of the wet film 52 and a plurality of fins for holding and holding the side end portion. When the band 72 is used as the flexible support and the flexible film 78 is peeled off after evaporating a part of the solvent, the holding means in the tenter 57 is preferably a clip, while using the drum as the flexible support In the case of peeling off the cooled coagulated film without substantially evaporating the solvent, the holding means in the tenter 57 is preferably a pin. Further, in the tenter 57, the wet film 52 is heated to a temperature of not less than 120 ° C and not more than 180 ° C, whereby the drying can proceed.

After the wet film 52 is dried in the tenter 57, both end portions of the wet film 52 are cut off by the corner cutting device 58. The cut end portions are sent to the crusher 89 by a cutter blower (not shown). The side end portion is crushed by the crusher 89 into a chip. The chip is reused for dope production.

On the other hand, the wet film 52 whose both ends are cut and removed is sent to the second drying chamber 61 and is further dried while being conveyed. The internal temperature of the second drying chamber 61 is not particularly limited, but is preferably 60 to 140 캜. The conveying path of the second drying chamber 61 is provided with a web guide roller 21 as in the first drying chamber 56. Thus, the "wetting" of the wet film 52 (web) can be suppressed and the wet film 52 can be stably transported. In addition, there is no case such as "wrinkles", "sagging" or "line-shaped scratches" at the boundary between the air flow roller 28 (non-contact supporting portion) and the edge roller 29 . The plurality of rollers provided on the conveying path of the second drying chamber 61 may be the web guide rollers 21 or only the web guide rollers 21.

The dried film 59 is preferably cooled in the cooling chamber 62 to about room temperature.

A winding device 92 for winding the film 59 and a press roller 93 for controlling the tension at the time of winding the film 59 are provided in the winding section 67.

In addition, there is a roller (not shown) on the conveying path of the solution film-forming equipment 50, and the web guide roller of the present invention can be used for any of these rollers. As a result, the web (the wet film 52 or the film 59) is prevented from being "skewed", and stable transport can be achieved. In addition, there is no case such as "wrinkles", "sagging" or "line-shaped scratches" at the boundary between the air flow roller 28 (non-contact supporting portion) and the edge roller 29 .

[Example]

In order to demonstrate the effect of the web guide apparatus of the present invention, Examples 1 to 6 using the web guide apparatus of the present invention and Comparative Examples 1 to 7 using the conventional web guide apparatus were compared. Hereinafter, the comparison results will be described with reference to Tables 1 and 2.

[Table 1]

[Table 2]

As shown in Table 1, in the first to sixth embodiments, in the web guide device 20, the web guide rollers 21 shown in Figs. 2 to 5 are used, And also conveyed on both sides of the web 12 in contact with each other. The web guide roller 21 of each of Examples 1 to 6 has a diameter of 80 mm, a width of the air flow roller 28 is 1450 mm, and the material of the air flow roller 28 is a porous metal. In Examples 1 to 6, the width of the web 12 supported in contact with the edge roller 29 was 20 mm with respect to the side. In Examples 1 to 6, the amount of airflow (air layer thickness) of the web 12 caused by the airflow roller 28 was 3 占 퐉 under the control of the air blower 25, 28, the amount of air in the outflow air flowing out from the circumferential surface of the exhaust port 28 was controlled. At this time, the supply amount of the outflow air required for floating the web 12 was 1 L / min, and the air pressure was 0.3 MPa. The floating amount (thickness of the air layer) of the web 12 was measured with a laser displacement gauge LK-G10 manufactured by Keyence.

As shown in Table 2, in Comparative Examples 1 to 4, a circumferential web guide roller having no step on the outer circumference was used in the web guide apparatus, and the entire web 12 And returned in a contact state. The web guide rollers of Comparative Examples 1 to 4 had a surface length (width) of 1600 mm and a diameter of 100 mm and were made of nickel, hard chrome plating, buff finish (roughness Ra <0.6 μm).

In the comparative examples 5 to 7, the web 12 was transported in a non-contact state with respect to the center of the web 12, and in contact with both sides of the web 12 using the stepped rollers in the web guide. In the web guide rollers of Comparative Examples 4 and 5, the width of the center portion was 1450 mm, the width of both side portions was 50 mm, the diameter of the center portion was 250 mm, and the diameters of both side portions were 300 mm. In Comparative Examples 5 to 7, the width of the web 12 supported in contact with both side portions of the web guide roller was 20 mm with respect to the side. In Comparative Examples 5 to 7, the amount of air to be discharged from the circumferential surface of the web guide roller was controlled so that the central portion of the web guide roller would have a floating amount of 25 mm to float the web 12. At this time, the amount of air supplied for floating the web 12 was 10,000 l / min.

As shown in Tables 1 and 2, in Examples 1 to 6 and Comparative Examples 1 to 7, a PET film having a width of 1490 mm was used as the web 12. Under these conditions, the thickness, the conveying speed, and the conveying tension of the web 12 are changed to "wrinkle and sag (wrinkles or sagging at both sides of the web 12 and the central portion thereof and in the vicinity thereof"), Scratches (scratches on the strips at the boundaries between the both side portions and the center portion of the web 12) "," product scratches (scratches on the center portion (product portion) of the web 12) Positional deviation in the direction &quot;). &Quot;

"Wrinkles and sagging", "edge scratches" and "product scratches" were evaluated by reflecting light on the web 12 and visually observing the reflection state. As for the "wrinkles and slacks", when "wrinkles" and "slackness" are confirmed at the boundaries between the both side portions and the central portion of the web 12 and in the vicinity thereof, it is evaluated as " Passed ". Regarding "edge scratches", when "line scratches" were confirmed at the boundaries between the both side portions and the center portion of the web 12, it was evaluated as "disqualified", and when the scratches were not confirmed, "pass" . As for the &quot; product scratches &quot;, when the &quot; scratches &quot; were confirmed in the product portion at the center of the web 12, it was evaluated as &quot; failed &quot; In addition, regarding the "meandering", the position of the end of the web 12 was monitored, and when a deviation of 1 mm or more occurred, it was evaluated as "failure", and when the deviation of 1 mm or more did not occur, .

[Example 1]

In the first embodiment, the thickness of the web 12 is 40 占 퐉, the transporting speed is 50 m / min, and the transporting tension is 100 N / m (see Table 1). In the first embodiment, an evaluation of "pass" was obtained for all the items ("wrinkles / sagging", "edge scratches", "product scratches", "meander").

[Example 2]

In the second embodiment, the thickness of the web 12 is 25 탆, the conveying speed is 50 m / min, and the conveying tension is 100 N / m (see Table 1). Also in the second embodiment, evaluation of &quot; pass &quot; was obtained for all the items.

[Example 3]

In Example 3, the web 12 was evaluated to have a thickness of 16 占 퐉, a conveying speed of 50 m / min, and a conveying tension of 100 N / m (see Table 1). Also in the third embodiment, evaluation of &quot; pass &quot; was obtained for all the items.

[Example 4]

In Example 4, the web 12 was evaluated to have a thickness of 16 탆, a conveying speed of 50 m / min, and a conveying tension of 300 N / m (see Table 1). Also in the fourth embodiment, evaluation of &quot; pass &quot; was obtained for all the items.

[Example 5]

In Example 5, the web 12 was evaluated to have a thickness of 16 μm, a conveying speed of 50 m / min, and a conveying tension of 30 N / m (see Table 1). Also in the fifth embodiment, evaluation of &quot; pass &quot; was obtained for all the items.

[Example 6]

In Example 6, the web 12 was evaluated to have a thickness of 16 탆, a conveying speed of 100 m / min, and a conveying tension of 30 N / m (see Table 1). As a result, evaluation of "pass" was obtained for all items in the sixth embodiment.

[Comparative Example 1]

In Comparative Example 1, the thickness of the web 12 was 40 μm, the conveying speed was 50 m / min, and the conveying tension was 100 N / m (see Table 2). In Comparative Example 1, the evaluation of &quot; product scratch &quot; was &quot; failed &quot;.

[Comparative Example 2]

In Comparative Example 2, the thickness of the web 12 was 25 μm, the conveying speed was 50 m / min, and the conveying tension was 100 N / m (see Table 2). In Comparative Example 2, the evaluation of &quot; product scratches &quot; was &quot; failed &quot;.

[Comparative Example 3]

In Comparative Example 3, the web 12 was evaluated to have a thickness of 16 μm, a conveying speed of 50 m / min, and a conveying tension of 100 N / m (see Table 2). In Comparative Example 3, the evaluation of &quot; product scratch &quot;

[Comparative Example 4]

In Comparative Example 4, the thickness of the web 12 was 16 μm, the conveying speed was 50 m / min, and the conveying tension was 30 N / m (see Table 2). In this Comparative Example 4, the evaluation of &quot; product scratches &quot; and &quot; meandering &quot;

[Comparative Example 5]

In Comparative Example 5, the thickness of the web 12 was 40 μm, the transporting speed was 50 m / min, and the transporting tension was 100 N / m (see Table 2). In this Comparative Example 5, the evaluation of &quot; edge scratch &quot; was &quot; failed &quot;.

[Comparative Example 6]

In Comparative Example 6, the thickness of the web 12 was 25 μm, the transporting speed was 50 m / min, and the transporting tension was 100 N / m (see Table 2). In Comparative Example 6, the evaluation of &quot; wrinkle / sagging &quot; and &quot; edge scratch &quot;

[Comparative Example 7]

In Comparative Example 7, the thickness of the web 12 was 16 μm, the conveying speed was 50 m / min, and the conveying tension was 100 N / m (see Table 2). In Comparative Example 7, the evaluation of &quot; wrinkles / sagging &quot; and &quot; edge scratches &quot;

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it was confirmed that "wrinkles / sagging", "edge scratches", "product scratches" and " Further, it was confirmed that the present invention effectively functions even when the thickness of the web to be conveyed is relatively small, such as less than 40 占 퐉 (see Examples 1 to 6). It was also confirmed that the present invention effectively functions even in the case where the transport tension is relatively high such as exceeding 100 N / m or in the case where the transport tension is relatively low such as below 100 N / m (Examples 4 - 6). Further, it was confirmed that the present invention effectively functions even if the conveying speed is relatively fast, such as exceeding 50 m / min (see Embodiment 6).

Claims (10)

A web guide device for guiding the conveyance of the web in the longitudinal direction,
A pair of contact supporting portions which contact the both sides of one side of the web with a peripheral surface and rotate according to the conveyance of the web,
An air layer is formed between the outer circumferential surface and the web by discharging air from the outer circumferential surface to support the widthwise central portion of the web in a noncontact state via the air layer, And the outer circumferential surface is formed in the same plane as the main surface of the contact support portion,
And the web guide device. The method according to claim 1,
Wherein the non-contact supporting portion is formed of a porous member having air permeability. 3. The method of claim 2,
Wherein the porous member is at least one of a ceramic sintered body, a porous metal, and a porous plastic. 4. The method according to any one of claims 1 to 3,
Wherein the contact support portion is rotated by a friction force with the web. 4. The method according to any one of claims 1 to 3,
And a rotation force supply unit for supplying a rotation force to the contact support unit,
Wherein the contact support portion is rotated by a rotational force supplied from the rotational force supply portion. 4. The method according to any one of claims 1 to 3,
Wherein the web has a thickness of 40 mu m or less. 5. The method of claim 4,
Wherein the web has a thickness of 40 mu m or less. 6. The method of claim 5,
Wherein the web has a thickness of 40 mu m or less. 4. The method according to any one of claims 1 to 3,
The web is separated from the non-contact supporting portion at a predetermined spacing position,
And the non-contact support portion causes the outflow air flowing out from the outer circumferential surface to flow out toward the web at the temporary position. 5. The method of claim 4,
Wherein the web is separated from the non-contact supporting portion at a predetermined discrete position,
And the non-contact support portion causes the outflow air flowing out from the outer circumferential surface to flow out toward the web at the temporary position.

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