JP2009085354A - Coating roll working method, coating roll and coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high rotation accuracy when attaching and using a coating roll in a coating apparatus since a roll surface is accurately ground even in a long coating roll. <P>SOLUTION: In the coating roll working method carrying out grinding of the roll surface while rotating the roll 14 in a state supporting both end sides of a rotating shaft 22 of the roll 14 by a pair of bearings, at least one of the pair of bearings is a bearing member 24 provided with a tilting function of following only deflection of the roll 14 in a gravitational direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating roll processing method, a coating roll, and a coating apparatus, and more particularly, to a coating roll processing technique used in a coating apparatus that uniformly forms a wide coating surface.

  Conventionally, various types of coating roll apparatuses have been proposed. Each of these coating roll apparatuses applies a coating solution while guiding a film having a relatively small width.

  By the way, with an increase in the area of functional films (for example, optical compensation films, antireflection films, etc.) used for liquid crystal displays and the like, the film width increases, and a wide coating roll apparatus is required.

  However, in a wide coating roll apparatus, axial deflection due to the weight of the coating roll (hereinafter, also simply referred to as “roll”) increases, and the moment on the bearing portion increases, resulting in roll runout during rotation. Moreover, the load to a bearing part increases with the increase in the roll weight accompanying lengthening of a roll. As a result, there has been a problem that the rotational accuracy of the roll is remarkably lowered and the coating film thickness applied to the film becomes non-uniform.

  On the other hand, for example, Patent Document 1 uses a bearing with a self-aligning mechanism (roller bearing) as a mechanism for rotating the roll. In order to compensate for the low rotational accuracy of the self-aligning mechanism-equipped bearing, a gas bearing outer ring is fixed inside the roll, and a gas bearing support shaft is provided inside the gas bearing outer ring. Thereby, the torque nonuniformity accompanying roll rotation is suppressed.

  Further, Patent Document 2 proposes a bearing structure in which a roll is fixed to an inner ring of an angular bearing, an outer ring of an angular bearing is fixed to an inner peripheral surface, and the outer peripheral surface is fitted with a housing having a spherical body. According to this, the rotation of the roll is made free regardless of the gravity direction or the horizontal direction. In addition, it is said that high rotational accuracy can be realized because there is no play in the axial direction of the angular bearing.

Patent Document 3 proposes a method in which a housing composed of a ball bearing and a roller bearing having a rotational runout accuracy of 1 μm or less is fitted to the shaft portion of the roll, and the roll surface is finally polished while rotating the roll. Has been.
JP-A-6-221325 JP 2006-349100 A JP 2002-336756 A

  However, with the above-described conventional coating roll processing method, it has been difficult to produce a highly accurate coating roll by accurately processing the surface of a long coating roll with high accuracy.

  For example, when the coating roll is ground using a bearing having a spherical housing as in Patent Document 2, the spherical housing can absorb the bending of the long coating roll in the gravity direction. However, since the degree of freedom to support the roll is too large and the rotational axis shake is likely to occur due to a slight external force in a direction different from the direction of gravity, for example, the rotational axis shake occurs during grinding due to the external force pressing the grinding tool against the roll surface. Easy to do. As a result, the ground roll cannot be precisely processed, and when such a roll is used as a coating roll of a coating apparatus, there arises a problem that the thickness of the coating film applied to the film is not uniform. .

  Further, when a roll is aligned with a bearing such as those in Patent Documents 1 to 3 above, there are many point contacts in terms of structure, and the dynamic characteristics of the bearing deteriorate and vibration may occur. When such vibration occurs, there is a possibility that high-precision processing cannot be performed. Further, in the spherical housing as in Patent Document 2, it is difficult to process the spherical surface with high accuracy, and there is a possibility that the processing cost of the bearing body increases.

  Furthermore, in the production process of a functional film, high rotation accuracy of 1 μm or less is required as a coating roll for performing high-precision thin layer coating, and processing accuracy that satisfies this accuracy is required.

  The present invention has been made in view of such circumstances, and even a long coating roll can be used to grind the roll surface with high accuracy. In this case, an object of the present invention is to provide a coating roll processing method capable of obtaining high rotational accuracy.

  In order to achieve the above object, a first aspect of the present invention provides a coating roll for grinding the surface of the roll while rotating the roll in a state where both ends of the rotating shaft of the coating roll are supported by a pair of bearings. In the processing method, at least one of the pair of bearings is a bearing member having a tilting function that follows only the bending of the roll in the gravity direction.

  According to claim 1, at least one of the bearings that support both ends of the rotating shaft of the coating roll that performs grinding of the roll surface is provided with a bearing member that has a tilting function that follows only the bending of the roll in the gravity direction. I used it. As a result, even if it is a long coating roll, it can absorb the bending in the gravity direction, and even if an external force other than the gravity direction such as the pressing force of the grinding tool is applied to the roll, the roll axis of rotation can fluctuate. Absent. Thereby, since a highly accurate grinding process can be performed, when mounting | wearing and using a coating roll for an application | coating apparatus, a high rotational accuracy can be obtained.

  A second aspect of the present invention is characterized in that, in the first aspect, the bearing member is the same as a bearing that supports the coating roll in an applicator provided with the coating roll.

  According to the second aspect, since the bearing member at the time of machining and the bearing member in the actual machine are made the same, it is possible to perform grinding without depending on the shape error of the bearing.

  Furthermore, by making the bearing member at the time of processing and the bearing member in the actual machine have the same structure, the tilting of the shaft in the film transport direction can be prevented in the actual machine. Therefore, if this bearing member is used for both processing of the coating roll and the actual machine, both high rotation accuracy resulting from the improvement of grinding accuracy and high rotation accuracy resulting from prevention of tilting of the shaft in the film conveying direction are obtained. be able to.

  A third aspect of the present invention is the first or second aspect, wherein the bearing member supports a first bearing portion that rotatably supports a rotating shaft of the coating roll, and supports the first bearing portion, and a gravity direction of the coating roll. And a second bearing portion that allows tilting of the first bearing portion so as to follow only the bending of the first bearing portion.

  According to the third aspect of the present invention, when the coating roll is processed, the bearing member including the second bearing portion that allows the first bearing portion to tilt so as to follow the bending of the coating roll in only the gravity direction is used. Thereby, even if an external force other than the direction of gravity is applied to the coating roll, the rotation axis of the coating roll does not fluctuate, and high rotation accuracy can be realized.

  In the third aspect, the first bearing portion is not particularly limited. For example, a hydraulic hydrostatic bearing can be preferably used. In addition, as the first bearing portion, when there is little disturbance such as vibration entering from the outside, a highly accurate ball bearing or roller bearing can be used. Further, when the required load capacity is small and the influence of the moment is small, such as the weight of the roll is small, a pneumatic bearing method using air pressure, a magnetic bearing method using magnetic force, or the like can be used.

  According to a fourth aspect of the present invention, in the third aspect, the second bearing portion is provided on an outer periphery of the first bearing portion, and a sliding bearing portion inner ring that supports the first bearing portion on an inner circumferential surface, and the sliding bearing portion inner ring. And a slide bearing part outer ring that slidably supports the outer peripheral surface of the inner ring of the slide bearing part.

  A fifth aspect of the present invention is the sliding bearing portion inner ring according to the fourth aspect, wherein the pair of upper and lower outer peripheral surfaces facing each other forms an arcuate convex curved surface along the axial direction of the coating roll and is centered on the axial direction. A pair of outer peripheral surfaces opposed to each other are formed in a partially cylindrical shape, and the slide bearing portion outer ring has a pair of upper and lower inner peripheral surfaces along the axial direction of the coating roll. A pair of inner peripheral surfaces that form an arcuate concave curved surface that is in contact with the pair of outer peripheral surfaces and that oppose left and right with the axial direction as a center are a pair of outer peripheral surfaces that oppose the left and right sides of the sliding bearing inner ring. It has a partial cylindrical space with a flat surface in contact with it.

  According to the fifth aspect, since the side surfaces of the sliding bearing inner ring and the sliding bearing outer ring that constitute the second bearing portion that face the left and right with respect to the axial direction of the coating roll are flat, the second bearing portion is The tilting in the left-right direction can be restricted. In addition, since the two outer peripheral surfaces facing the top and bottom of the inner ring of the sliding bearing portion form an arcuate convex curved surface, the coating roll can be allowed to tilt in the axial direction.

  Thereby, since the point contact part can be reduced as compared with the conventional bearing while ensuring the degree of freedom necessary for alignment, alignment can be performed with improved dynamic characteristics of the bearing. Further, since the accuracy of the curved surface processing is higher than that of the conventional spherical type slide bearing, even if the inner diameter of the slide bearing portion and the outer ring of the slide bearing portion become large, both can be accurately processed. Therefore, the alignment can be made highly accurate and the cost can be reduced.

  A sixth aspect of the present invention is characterized in that, in any one of the first to fifth aspects, the rotational runout accuracy of the coating roll is 1 μm or less.

  According to the sixth aspect, high rotational accuracy can be realized. Here, as a measuring method of the rotation accuracy, there is a measurement of a shake amount of the roll surface by a capacitance type displacement sensor. That is, the displacement amount of the roll surface is acquired as time series data by a displacement sensor installed at a fixed point during the rotation of the roll. The Peak to Peak value of the obtained waveform (horizontal axis: time, vertical axis: displacement) is evaluated as the shake accuracy.

  A seventh aspect of the present invention is characterized in that, in the fifth or sixth aspect, a radius of curvature R of the arcuate convex curved surface is 0.8 to 2 times an inner diameter d of the inner ring of the sliding bearing portion.

  If the radius of curvature of the arc-shaped convex curved surface is too small, the rigidity required to support the coating roll will be lowered due to the structure. If the radius of curvature is too large, sufficient alignment cannot be obtained. Neither is preferred. According to claim 7, the radius of curvature of the arc-shaped convex curved surface is 0.8 to 2 times (about 40 to 500 mm) of the inner diameter d (about 50 to 250 mm) of the inner ring of the sliding bearing portion. Such a problem can be suppressed.

  An eighth aspect according to any one of the fifth to seventh aspects, wherein the ratio B / R of the width B between the planes facing the left and right sides and the curvature radius R is 1 in the outer peripheral surface of the inner ring of the sliding bearing portion. ~ 5.

  According to the eighth aspect, even when a force other than the direction of gravity acts on the inner ring of the sliding bearing, the position of the inner ring of the sliding bearing becomes stable with respect to the outer ring of the sliding bearing, and the dynamic characteristics of the inner ring of the sliding bearing are reduced. High alignment can be demonstrated without any problems. That is, if the B / R ratio is less than 1, the dynamic characteristics of the inner ring of the sliding bearing portion are likely to deteriorate, and if the B / R ratio exceeds 5, the weight of the inner ring of the sliding bearing portion increases, making smooth alignment difficult. For this reason, the B / R ratio is preferably about 1 to 5.

  A ninth aspect is characterized in that, in any one of the third to eighth aspects, the first bearing portion is a hydraulic hydrostatic bearing.

  According to the ninth aspect, since the hydrostatic bearing system showing high vibration damping, high rotation accuracy, high load capacity, etc. is adopted as the bearing system for supporting the coating roll, both static characteristics and dynamic characteristics are adopted. Can be improved. Further, in the first bearing portion that supports the long coating roll, it is possible to prevent galling (contact) between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the first bearing portion, which are a concern.

  A tenth aspect of the present invention provides the method according to the ninth aspect, wherein measuring means for measuring the temperature of the lubricating oil of the hydraulic hydrostatic bearing, and temperature control means for controlling the lubricating oil to a predetermined temperature based on a result of the measuring means. , Provided.

  When supporting a coating roll having a large width and weight, high bearing rigidity is required. However, the oil supply pressure of the hydrostatic hydrostatic bearing increases, and the lubricating oil easily generates heat. Since the temperature of this lubricating oil affects the performance of the bearing even in the range of ± several degrees C., temperature control of the lubricating oil is important. According to the tenth aspect, since the temperature of the lubricating oil is monitored and the lubricating oil is controlled to have a predetermined temperature, the performance of the bearing can be maintained stably.

  An eleventh aspect is characterized in that, in any one of the first to tenth aspects, an effective surface length of the coating roll is 3000 mm or less.

  The coating roll having such a large width increases the axial deflection due to its own weight. According to the eleventh aspect, since the effective surface length of the coating roll is 3000 mm or less, the amount of deflection of the coating roll can be made constant or less (50 μm or less).

  A twelfth aspect according to any one of the third to eleventh aspects, wherein both ends of the rotating shaft of the coating roll are supported by the pair of bearing members, and one of the pair of bearing members includes a first bearing portion. It is characterized by being supported by a thrust bearing.

  If the coating roll is simply supported by the journal type hydrostatic bearing, the movement of the rotating shaft in the thrust direction becomes free. For this reason, there is a method of supporting the thrust direction at both ends of the coating roll as a bearing mechanism for restricting the movement of the coating roll in the thrust direction. However, when thermal expansion in the axial direction of the coating roll due to heat generation of the lubricating oil occurs, there is no play in the axial direction, and there is a risk of deformation due to a compressive load. According to the twelfth aspect, since the thrust bearing is provided on only one of the coating rolls, the above-described problems can be suppressed.

  According to a thirteenth aspect of the present invention, there is provided a coating roll produced by the coating roll processing method according to any one of the first to twelfth aspects, in order to achieve the object.

  According to the thirteenth aspect, it is possible to obtain a coating roll exhibiting high rotational accuracy without causing rotational shaft shake.

  According to a fourteenth aspect of the present invention, in order to achieve the above object, a coating liquid bridge is formed in a clearance between a coating head and a strip-shaped film wound around a coating roll and running in the horizontal direction, and the coating is performed. An extrusion-type coating apparatus for coating the film with a coating liquid discharged from a head. The coating apparatus includes the coating roll according to claim 13.

  According to the fourteenth aspect, in such a coating apparatus, the rotation axis of the coating roll does not fluctuate in the film conveyance direction. For this reason, a uniform clearance can be formed between the coating roll around which the film is wound and the coating head, and the coating liquid can be uniformly coated. The coating roll includes a backup roll.

  According to the present invention, even a long coating roll can be ground with high accuracy. Moreover, when mounting | wearing and using a coating roll for an application | coating apparatus, high rotation accuracy can be obtained.

  Hereinafter, preferred embodiments of a coating roll bearing structure and a coating apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view for explaining the outline of a coating apparatus having a coating roll bearing structure according to the present invention. Among these, FIG. 1 (A) is a figure which shows the principal part of a coating device, and FIG. 1 (B) is a figure which shows the structural member of a bearing member.

  As shown in FIG. 1, a coating device 10 is a device that applies a coating solution to a continuously running film, and mainly a backup roll 14 (hereinafter simply referred to as “roll 14”) around which the film 12 is wound. And an extrusion-type coating head 16 disposed with a predetermined clearance with respect to the roll 14. Hereinafter, the axial direction of the roll 14 is the X direction, and the left and right direction (the direction perpendicular to the axial direction or the film transport direction) is the Y direction and the vertical direction (the direction of gravity) is the axial direction of the roll 14 The Z direction is used, and both include the plus side and the minus side.

  A pocket 18 is formed in the width direction of the film 12 inside the extrusion type coating head 16. The pocket 18 communicates with the slit opening 20 a at the tip (lip) of the coating head 16 via the slit 20. The slit opening 20 a is formed in an elongated shape in the width direction of the film 12, and the width dimension is formed to be substantially equal to the width dimension of the film 12. Then, the coating liquid supplied to the pocket 18 via the supply path 17 by a coating liquid supply source (not shown) is discharged from the slit opening 20 a via the slit 20. Then, a coating solution bridge (bead) is formed in the clearance between the tip of the coating head 16 and the continuously running film 12, and the coating solution is transferred to the film 12. The application head 16 is supported by a support member (not shown).

  The roll 14 is formed to be wide enough to wind the film 12, and the rotating shafts 22 at both ends thereof are rotatably supported by bearing members 24 having the bearing structure according to the present invention.

  For example, the roll 14 used in the present invention is easily bent in the direction of gravity due to its own weight because the weight of the roll 14 is about 400 kg and the width is relatively large. When this bending occurs, the clearance distribution between the coating head 16 and the roll 14 becomes non-uniform. For this reason, in order to keep the clearance distribution between the coating head 16 and the roll 14 uniform, it is necessary to adjust the tip shape of the coating head 16 to the shape of the bent roll 14. The amount of error that appears during this adjustment is affected by the amount of deflection of the roll 14. Specifically, about 10% of the deflection amount of the roll 14 appears as a clearance adjustment error.

  Since the distribution accuracy of the clearance between the coating head 16 and the roll 14 is required to be 5 μm or less, the deflection amount of the roll 14 is preferably 50 μm or less, and the effective surface length L of the roll 14 is 3000 mm or less. It is preferable.

  However, even if the above adjustment is performed, the film 12 is wound around the roll 14 and conveyed in the horizontal direction. Therefore, due to fluctuations in the tension of the film 12 applied to the roll 14 and external vibration in the conveyance direction transmitted to the roll 14. The clearance between the coating head 16 and the roll 14 varies. Thereby, the film thickness distribution of a coating layer and the film width direction becomes non-uniform | heterogenous. For this reason, it is necessary to stably support (align) the roll 14 so as not to cause shaft runout (fluctuation of the rotational axis) while following the axial deflection of the roll 14.

  Therefore, in the present invention, the bearing member 24 is configured so as to eliminate alignment in the film conveyance direction (Y direction) and align only in the axial direction (X direction) of the roll 14. Hereinafter, the bearing member 24 which is a characteristic part of the present invention will be described.

  In the bearing member 24, a hydraulic hydrostatic bearing 26 (first bearing portion) that rotatably supports the rotating shaft 22 is disposed on the outer periphery of the rotating shaft 22 of the roll 14, and further on the outer periphery thereof is a hydraulic type. A slide bearing 27 (second bearing portion) that supports the hydrostatic bearing 26 and aligns the roll 14 is provided.

  The slide bearing 27 includes a slide bearing portion inner ring 28 and a slide bearing portion outer ring 30.

  As shown in FIG. 1B, the slide bearing portion inner ring 28 has two outer peripheral surfaces 28a, 28b facing the Z direction (vertical direction) of the slide bearing portion inner ring 28 in a convex curved surface having an arc shape in the X direction. The two outer peripheral surfaces 28c and 28d facing the Y direction (left and right with the axial direction as the center) are formed in a partially cylindrical shape that forms a plane.

  A slide bearing portion outer ring 30 that supports the slide bearing portion inner ring 28 is disposed on the outer periphery of the slide bearing portion inner ring 28, and is formed so as to accommodate the slide bearing portion inner ring 28. That is, the two inner peripheral surfaces 30a and 30b facing the Z direction (vertical direction) of the outer ring 30 form an arcuate concave curved surface in the X direction, and are opposed to the Y direction (left and right around the axial direction). The two inner peripheral surfaces 30c and 30d are flat (see FIG. 4 described later). As a result, the slide bearing inner ring 28 tilts only in the X direction and does not tilt in the Y direction. Therefore, the hydraulic hydrostatic bearing 26 that supports the rotating shaft 22 can be allowed to tilt only in the X direction and can not be tilted in the Y direction.

  If the radius of curvature R is too small, the outer peripheral surfaces 28a and 28b of the plain bearing portion inner ring 28 are structurally less rigid to support the roll 14, and if the radius of curvature R is too large, the alignment is reduced. For this reason, the curvature radius R of the outer peripheral surfaces 28a and 28b of the sliding bearing portion inner ring 28 is set to 0.8 to 2 times (about 40 to 500 mm) the inner diameter d (about 50 to 250 mm) of the sliding bearing portion inner ring 28. Is preferred.

  Of the outer peripheral surface of the sliding bearing inner ring 28, the ratio between the width B and the radius of curvature R between the two outer peripheral surfaces 28c, 28d facing in the Y direction (left and right with the axial direction as the center) (hereinafter referred to as "B / When the R ratio is less than 1, the dynamic characteristics of the sliding bearing inner ring 28 are likely to deteriorate, and when it exceeds 5, the weight of the sliding bearing inner ring 28 increases, and smooth alignment cannot be achieved. For this reason, it is preferable to make B / R ratio into 1-5.

  FIG. 2 is an enlarged cross-sectional view illustrating the internal configuration of the bearing member 24 having the bearing structure according to the present invention. The figure shows the bearing member 24 on the side where the thrust bearing is provided.

  As shown in FIG. 2, an outer peripheral member 32 of a hydraulic hydrostatic bearing 26 that rotatably supports the rotating shaft 22 is fixed to the inner peripheral surface of the slide bearing portion inner ring 28. It moves together. An oil supply groove 34 for supplying lubricating oil is provided in the circumferential direction on the inner peripheral surface of the slide bearing portion inner ring 28.

  A static pressure pocket 36 and an atmospheric pressure release groove 38 are formed along the circumferential direction and the axial direction between the inner wall surface of the hydraulic static pressure bearing 26 and the rotary shaft 22, and the static pressure pocket 36 and the atmospheric pressure are formed. The release groove 38 communicates with the outer peripheral surface of the rotating shaft 22 via a bearing metal member 40 in which a fine flow path is formed so that lubricating oil can pass. The atmospheric pressure release groove 38 is sealed by a seal member 42. Further, an oil supply port 44 is formed on the surface of the outer peripheral member 32 facing the oil supply groove 34, and the oil supply port 44 and the static pressure pocket 36 communicate with each other through an oil supply hole 46 formed in a fine channel shape. ing. The static pressure pockets 38 and 38 communicate with an oil drain hole 48 formed along the axial direction at the lower part in the direction of gravity, and the oil drain hole 48 communicates with an oil drain port 50.

  Thereby, the lubricating oil passes from the oil supply groove 34 formed in the circumferential direction through the oil supply port 44 and the oil supply hole 46, and the static pressure pocket 36, the bearing metal member 40 (circumferential fine flow path), and the atmospheric pressure. It is supplied to the release groove 38. The lubricating oil circulating through the static pressure pocket 36 and the atmospheric pressure release groove 38 is collected in the oil drain hole 48 and then discharged to the outside through the oil drain port 50.

  A lubricating oil supply source 52 for storing and supplying lubricating oil communicates with each of the oil supply groove 34 and the oil discharge port 50 through pipe lines 54a and 54b, and a lubricating oil circulation path 54 is formed. A thermometer 56 for measuring the temperature of the lubricating oil and a lubricating oil temperature control mechanism 58 are provided in the middle of the lubricating oil circulation path 54. In the thermometer 56, the temperature of the lubricating oil can be constantly monitored. The lubricating oil temperature control mechanism 58 controls the temperature of the lubricating oil to be a predetermined temperature using a temperature control device such as air cooling, water cooling, or a refrigerant method. Thereby, based on the temperature measurement result of the lubricating oil in the thermometer 56, the lubricating oil temperature control mechanism 58 controls the temperature of the lubricating oil to be a predetermined temperature.

  Inside the hydraulic hydrostatic bearing 26, a thrust bearing 60 is provided in a flange shape next to the atmospheric pressure release groove 38 on the side opposite to the roll 14. The thrust bearing 60 is rotatable together with the roll 14 while being fixed to the roll 14, and oil is applied to the circumferential side surface between the outer peripheral member 32 and the fixed member 62 fixed by the screw 64. A fine flow path that can be lubricated is formed. The lubricating oil that has flowed out of the atmospheric pressure release groove 38 passes through the fine flow path and lubricates to restrict the movement of the roll 14 in the axial direction. A rubbing seal 66 is provided on the roll 14 side of the hydraulic hydrostatic bearing 26 as necessary.

  The thrust bearing 60 is preferably provided on only one of the pair of bearing members 24. That is, when the lubricating oil generates heat, thermal expansion in the axial direction of the roll 14 occurs, but the amount of expansion increases as the roll becomes longer. If the thrust direction is supported at both ends of the roll 14, there is no play in the axial direction, and there is a risk of deformation due to a compressive load. Therefore, by providing the thrust bearing 60 on only one of the pair of bearing members 24 that support the roll 14, the above problems are suppressed.

  Next, the procedure of the processing method of the present invention will be described with reference to FIGS. FIG. 3 is a conceptual diagram of a processing apparatus 10 'to which the processing method of the present invention is applied. In the figure, the same bearing member 24 as described in the above application device is used as a bearing that rotatably supports the rotating shaft 22 of the roll 14 to be ground. FIG. 4 is a schematic diagram showing how the roll 14 bends in the direction of gravity, and FIG. 5 is a schematic diagram for explaining the operation of the bearing member 24. 5A is a view of the operation in FIG. 3 as viewed from the front, and is a cross-sectional view of the bearing member 24 in the direction of gravity. FIG. 5B is a view of the operation in FIG. 3 as viewed from above, and is a cross-sectional view of the bearing member 24 in the horizontal direction.

  First, as shown in FIG. 3, the rotating shafts 22 at both ends of the roll 14 are attached to the bearing member 24, and the roll 14 is ground with a grinding tool 68 while being rotatably supported. At this time, the surface of the roll 14 is ground so that the rotational runout accuracy of the roll 14 is 1 μm or less. The rotational runout accuracy refers to a Peak-to-Peak value of a time-series waveform obtained from the result of measuring the amount of displacement on the roll surface, and can be measured by, for example, a capacitive displacement sensor.

  When starting the grinding process, as shown in FIG. 4, the roll 14 is bent in the direction of gravity by its own weight. At this time, in the bearing member 24, as shown in FIG. 5A, the sliding bearing inner ring 28 tilts in the X direction following the bending of the roll 14 (see the arrow).

  When the state at this time is viewed from above, as shown in FIG. 5 (B), in the bearing member 24, the outer peripheral surface 28c of the sliding bearing inner ring 28 and the inner peripheral surface 30c of the outer ring 30 in the Y direction, Since the outer peripheral surface 28d of the sliding bearing portion inner ring 28 and the inner peripheral surface 30d of the sliding bearing portion outer ring 30 are in contact with each other on a plane, the sliding bearing portion inner ring 28 is stably fixed without tilting in the Y direction. .

  That is, even if the roll 14 is bent, the plain bearing portion inner ring 28 is tilted only in the X direction so as to follow the bending, and is not tilted in the Y direction. For this reason, the rotation axis 14A (dotted line) of the roll 14 does not fluctuate, and the roll 14 can be rotatably supported with high rotational accuracy. Therefore, even if the roll 14 is bent or an external force is applied from a direction other than the gravity direction, the surface of the roll 14 can be finally processed in a state in which the shake of the rotation axis of the coating roll is eliminated.

  Thus, according to this embodiment, since the roll surface is ground in a state where the rotary shaft 22 of the roll 14 is rotatably supported so as to follow the bending of the roll 14 only in the gravity direction, Even when an external force such as a force is applied, the rotational axis of the roll does not fluctuate. Therefore, even with a long coating roll, the roll surface can be ground with high accuracy. Moreover, when mounting | wearing and using a coating roll for an application | coating apparatus, high rotation accuracy can be obtained. Furthermore, since the bearing member at the time of processing and the bearing member in the actual machine are made the same, it is possible to perform grinding without depending on the shape error of the bearing.

  Compared to conventional spherical type plain bearings, the partial cylindrical type slide bearing of the present invention has a higher accuracy of curved surface processing. Therefore, even if the inner diameter of the slide bearing part and the outer ring of the slide bearing part become larger, both of them can be combined. Processing can be performed with high accuracy. Therefore, the alignment can be made highly accurate and the cost can be reduced.

  In addition, as a film 12 used for this invention, well-known various films can be used. Generally, various known plastic films such as polyethylene terephthalate, polyethylene-2,6-naphthalate, cellulose diacetate, cellulose triacetate, cellulose acetate propionate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyimide, polyamide, Paper, various laminated papers coated with or laminating α-polyolefins having 2 to 10 carbon atoms such as polyethylene, polypropylene, ethylene butene copolymer, etc., belt-like substrates such as metal foils such as aluminum, copper and tin And a composite material obtained by laminating these layers.

  As mentioned above, although preferable embodiment of the processing method of the roll which concerns on this invention was described, this invention is not limited to the said embodiment, Various aspects can be taken.

  For example, in each of the above embodiments, the hydrostatic hydrostatic bearing 26 that is reliable in high vibration damping, high rotational accuracy, high load capacity, and the like is employed as the first bearing portion that supports the rotating shaft 22. However, various bearings can be used. In addition, when there is little disturbance such as vibration entering from the outside, a highly accurate ball bearing system or roller bearing system can be adopted. Further, when the required load capacity is small and the influence of the moment is small, such as the weight of the roll is small, a pneumatic bearing method using air pressure, a magnetic bearing method using magnetic force, or the like can be adopted.

  In each said embodiment, although the bearing member 24 which has the bearing structure which concerns on this invention was arrange | positioned at the both ends of the roll 14, it is not limited to this, You may arrange | position to only one side. Also in this case, the same effect as described above can be obtained.

  Further, in the present embodiment, the processing method of the backup roll around which the film is wound in the coating apparatus using the extrusion type coating head has been described. However, the present invention is not limited to this. For example, the coating liquid scraped up by the roll The present invention can also be applied to a method for processing a coating bar in a bar coating apparatus that transfers a film to a film.

  The roll surface was ground in a state where both ends of the rotating shaft 22 of the test coating roll having an effective surface length of 1500 mm and a roll diameter of 100 mm were supported by bearings. The coating roll was manufactured in the following flow.

  First, a hollow material pipe having a desired material (chrome molybdenum steel, aluminum, or the like, which can be appropriately changed depending on the intended use) and a size, was cut and finished with a bite. A cylindrical member having an outer diameter equal to that of the inner diameter portion of the raw pipe was shrink-fitted to both ends of the raw pipe to attach the rotary shaft 22 to form the outer shape of the roll.

  Next, the outer diameter of the roll was ground with a grindstone (at this time, the roll axis and the grindstone axis were parallel), and the roll surface was subjected to Ni—Cr plating treatment of about 30 μm. Furthermore, the surface was prepared by performing run-off as necessary and performing vertical polishing (in this vertical polishing, the axis of the grindstone was approximately perpendicular to the axis of the roller).

  Then, the surface was finally buffed in a state where it was fitted to the bearing member under the following conditions to finish the accuracy.

  As a bearing support system at the time of polishing, a case where only one of the rotating shafts 22 is supported by the bearing member 24 of the present invention is referred to as Example 1, and a case where both ends of the rotating shaft 22 are supported by the bearing member 24 of the present invention is used. The case where it was set as Example 2 and it supported by the conventional bearing member (slide bearing) without using the bearing member 24 of this invention was made into the comparative example 1.

  The processing accuracy was measured by measuring the rotational runout accuracy of the roll after grinding, and was evaluated according to the following criteria.

○… Rotational runout accuracy is 1 μm or less and machining accuracy is very good. Δ… Rotational runout accuracy is over 1 μm and 3 μm or less, and machining accuracy is good. The results are shown in Table 1.

  As shown in Table 1, in Examples 1 and 2 in which the bearing member 24 of the present invention is used for either one of the rotary shafts 22 of the roll, it can be seen that high processing accuracy (rotational runout accuracy) can be obtained. It was. On the other hand, in Comparative Example 1 supported by the conventional bearing member without using the bearing member 24 of the present invention, it is understood that the processing accuracy of the roll surface is inferior on the order of several μm compared to Examples 1 and 2. It was.

  From the above results, it was confirmed that the machining accuracy could be improved by using the bearing member 24 of the present invention for at least one of the pair of bearings that support both ends of the roll.

It is a perspective view explaining the outline | summary of the coating device incorporating the roll manufactured with the processing method of the coating roll which concerns on this invention. It is an expanded sectional view explaining the internal structure of the bearing member in FIG. It is a conceptual diagram of the processing apparatus which applies the processing method which concerns on this invention. It is explanatory drawing explaining a mode that a roll bends in a gravitational direction. It is explanatory drawing explaining operation | movement in the processing apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Application | coating apparatus, 10 '... Processing apparatus, 12 ... Film, 14 ... Roll, 16 ... Application | coating head, 22 ... Rotating shaft, 24 ... Bearing member, 26 ... Hydraulic hydrostatic bearing, 27 ... Slide bearing, 28 ... Slide Bearing part inner ring, 28a, 28b ... Outer peripheral surface of sliding bearing part inner ring (Z direction), 28c, 28d ... Outer peripheral surface of sliding bearing part inner ring (Y direction), 30 ... Outer ring of sliding bearing part, 30a, 30b ... Sliding bearing part Inner peripheral surface of outer ring (Z direction), 30c, 30d ... Inner peripheral surface of sliding bearing outer ring (Y direction), 36 ... Static pressure pocket, 38 ... Atmospheric pressure release groove, 56 ... Thermometer, 58 ... Lubricating oil temperature Control mechanism, 60 ... thrust bearing

Claims (14)

In the coating roll processing method for grinding the roll surface while rotating the roll in a state where both ends of the rotating shaft of the coating roll are supported by a pair of bearings,
At least one of the pair of bearings is a bearing member having a tilting function that follows only the bending of the roll in the gravitational direction.   The method of processing a coating roll, wherein the bearing member is the same as a bearing that supports the coating roll in an applicator provided with the coating roll. The bearing member is
A first bearing portion that rotatably supports the rotating shaft of the coating roll;
A second bearing portion that supports the first bearing portion and allows the tilting of the first bearing portion so as to follow only the bending in the gravity direction of the coating roll;
The processing method of the coating roll of Claim 1 or 2 characterized by the above-mentioned. The second bearing portion is
A slide bearing portion inner ring provided on an outer periphery of the first bearing portion and supporting the first bearing portion on an inner peripheral surface;
A slide bearing portion outer ring provided on the outer periphery of the slide bearing portion inner ring, and slidably supporting the outer peripheral surface of the inner ring;
The method for processing a coating roll according to claim 3, wherein the bearing is a sliding bearing. The inner ring of the sliding bearing portion has a pair of outer peripheral surfaces facing vertically forming an arcuate convex curved surface along the axial direction of the coating roll and a pair of outer peripheral surfaces facing left and right centering on the axial direction. Is formed in a partial cylindrical shape,
The sliding bearing portion outer ring has an arcuate concave curved surface in which a pair of upper and lower inner circumferential surfaces that are vertically opposed contact the pair of outer circumferential surfaces of the sliding bearing inner ring along the axial direction of the coating roll. The pair of inner peripheral surfaces opposed to the left and right with a direction as a center has a partially cylindrical space that forms a plane in contact with the pair of outer peripheral surfaces opposed to the left and right of the sliding bearing inner ring. 5. A method for processing a coating roll according to 4.   The processing method of a coating roll according to any one of claims 1 to 5, wherein a rotational runout accuracy of the coating roll is set to 1 µm or less.   The method of processing a coating roll according to claim 5 or 6, wherein a radius of curvature R of the arcuate convex curved surface is 0.8 to 2 times an inner diameter d of the inner ring of the sliding bearing portion. Among the outer peripheral surfaces of the sliding bearing inner ring,
8. The coating roll processing method according to claim 5, wherein a ratio B / R between a width B between the left and right planes and the radius of curvature R is 1 to 5. 9. .   The coating roller processing method according to claim 3, wherein the first bearing portion is a hydraulic hydrostatic bearing. Measuring means for measuring the temperature of the lubricating oil of the hydraulic hydrostatic bearing;
Temperature control means for controlling the lubricating oil to a predetermined temperature based on the result of the measurement means;
The processing method of the coating roll of Claim 9 characterized by the above-mentioned.   The effective surface length of the said coating roll is 3000 mm or less, The processing method of the coating roll of any one of Claims 1-10 characterized by the above-mentioned.   The both ends of the rotating shaft of the coating roll are supported by the pair of bearing members, and one first bearing portion of the pair of bearing members is supported by a thrust bearing. The processing method of the coating roll of any one of these.   A coating roll produced by the coating roll processing method according to claim 1. An extrusion type in which a coating liquid bridge is formed in the clearance between the coating head and a strip-shaped film wound around a coating roll and running in the horizontal direction, and the coating liquid discharged from the coating head is applied to the film. In the coating device of
A coating apparatus comprising the coating roll according to claim 13.

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