JP5179614B2 - Endless band inspection method and apparatus - Google Patents

Description

  The present invention relates to an endless band inspection method and apparatus.

  With the increase in the screen size of a liquid crystal display (LCD), an optical film used for the LCD is also required to have a large area. The optical film is manufactured to be long and then cut into a predetermined size according to the dimensions of the LCD. Therefore, in order to manufacture an optical film having a larger area, it is necessary to manufacture a long optical film having a width larger than that of the conventional one.

  As a typical method for producing a long optical film, there is a continuous solution casting method. As is well known in the solution casting method, a dope in which a polymer is dissolved in a solvent is cast on a moving casting support, and a casting film made of the dope is formed on the casting support. In this method, the cast film is peeled off from the cast support and dried.

  As a casting support, a metal band stretched around a driving roller is used, and the maximum width of a film that can be manufactured is limited by the width of the band. Therefore, a wider band is required to produce a wider film. However, until now, only bands with a width of up to about 2 m have been obtained.

  Therefore, in Patent Document 1, a band having a larger width than the conventional band is welded in the longitudinal direction to a central band that is a central part in the width direction and a pair of side bands that are each side part of the band. Have gained.

Korean Patent Publication No. 2009-0110082

  However, the band described in Patent Document 1 is likely to warp in the width direction due to a welding line extending in the longitudinal direction. In particular, warping is likely to occur from the end of the band in the width direction, that is, from the center band to the side band. If the solution film-forming method is performed using a band whose end in the width direction is warped, unevenness in the thickness of the cast film occurs due to this warpage. Even if the cast film having such thickness unevenness is dried, it becomes a film having thickness unevenness. Furthermore, when the cast film having the uneven thickness is peeled off, a residual peeling failure is likely to occur. Further, when the cast film having uneven thickness is dried, foaming is likely to occur. In addition, when the band is stretched over the drive roller so that the inner surface of the band curved by warpage is in contact with the peripheral surface of the drive roller, the end of the band is locally at the side of the band. Will come into contact. If the state where the band end is locally in contact with the peripheral surface of the drive roller is continued, deformation of the side portion of the band increases, and thus the problem due to the thickness unevenness described above easily occurs.

  In addition, when it becomes possible to manufacture a band that exceeds the production limit width at the present time by technical development, the warp caused by the welding line is eliminated by using the band. However, an increase in the band width causes a problem of warping in the width direction.

  Thus, regardless of the presence or absence of a welding line, when using a band wider than the conventional band, a problem of warpage in the width direction occurs.

  An object of the present invention is to provide an endless band inspection method and apparatus capable of detecting a warp of a band without performing a solution casting method when a band wider than the conventional one is manufactured.

In order to solve the above-described problems, the present invention provides a surface for forming a casting film made of the dope that has reached the arrival position where the dope flowing down from the casting die arrives, and film formation when circulating In a method for inspecting a metal endless band provided with a back surface to be supported by a roller, the back surface is supported by the inspection roller and corresponds to the reaching position in the endless band in a state in which a moving tension is applied. The distance H calculation step of calculating the distance H from the measured position on the surface to the support surface of the inspection roller, and the floating amount CL from the support surface to the back surface at the measurement position by the equation (1) It has a floating amount calculation step to calculate, and a determination step for determining whether or not the calculated floating amount CL is equal to or less than a threshold value.
Formula (1) CL = HD
D: thickness of the endless band at the measurement position

The inspection roller supports the endless band at the axial center so that the axial end is exposed, and in the distance calculation step, the distance from the measurement position to the distance measuring means using the distance measuring means. It is preferable to measure a distance B from A to the distance measuring means at the axial position at A and the measurement position, and calculate the distance H by Equation (2).
Formula (2) H = BA

  In the float amount calculating step, the position information from the reference position set to the endless band to the measurement position and the thickness D of the endless band at the measurement position are stored in association with each other from the storage means. It is preferable to read the thickness D and calculate the floating amount CL using the thickness D of the endless band read from the storage means.

The endless band is preferably composed of a metal first web and a metal second web welded to one side in the width direction of the first web. Moreover, it is preferable that the film forming roller and the inspection roller are the same roller. Furthermore, it is preferable that the moving tension is 60 N / mm ² and the threshold value is 0.1 mm or less.

In the present invention, the arrival position where the dope flowing down from the casting die reaches is set, and the surface for forming the casting film made of the reached dope is supported by the film-forming roller when circulating. In a metal endless band inspection apparatus provided with a back surface for measuring on the surface corresponding to the reaching position of the endless band in a state where the back surface is supported by a roller for inspection and a moving tension is applied. Distance calculating means for calculating a distance H from the position to the support surface of the inspection roller, and a float amount calculating means for calculating a float amount CL from the support surface to the back surface at the measurement position by Equation (1). And determining means for determining whether or not the calculated floating amount CL is equal to or less than a threshold value.
Formula (1) CL = HD
D: thickness of the endless band at the measurement position

The inspection roller supports the endless band at the axial center so that the axial end is exposed, and measures the distance A to the measurement position and the distance B to the axial end at the measurement position. It is preferable that a distance measuring unit is provided, and the distance calculating unit calculates the distance H according to Equation (2).
Formula (2) H = BA

  The storage unit stores the position information from the reference position set to the endless band to the measurement position and the thickness D of the endless band at the measurement position in association with each other. It is preferable to calculate the floating amount CL using the thickness D of the endless band stored in the storage unit.

  The film-forming roller and the inspection roller are preferably the same roller.

  According to the present invention, from the endless band in which the back surface is supported by the inspection roller and the moving tension is applied, from the measurement position on the surface corresponding to the arrival position where the dope lands to the support surface of the inspection roller. A distance H calculating step for calculating the distance H, a floating amount calculating step for calculating a floating amount CL from the support surface to the back surface at the measurement position, and a determination for determining whether the calculated floating amount CL is equal to or less than a threshold value. Therefore, the warping of the band can be detected without performing the solution casting method.

It is a side view which shows the outline | summary of the manufacturing equipment of a band. It is a top view which shows the outline | summary of a band manufacturing equipment. It is a side view which shows the outline | summary of a welding unit. It is a top view which shows the outline | summary of a welding unit. It is a VV line sectional view showing an outline of a welding support roller. It is explanatory drawing of a weld bead and its periphery. It is the schematic of a taper roller. It is the schematic of a clip. It is the schematic of a band. It is a side view which shows the outline | summary of solution casting apparatus. It is a side view which shows the outline | summary of the arrival position DP and the pressure reduction area BA. It is a perspective view which shows the outline | summary of a casting die, a pressure reduction chamber, and the film forming roller. It is a perspective view which shows the outline | summary of the arrival position DP and the pressure reduction area BA. It is a side view which shows the outline | summary of a band test | inspection apparatus when a rotating shaft is set to the tension application position. It is a perspective view which shows the outline | summary of the band wound around the roller for a test | inspection. It is a block diagram which shows the outline | summary of a band test | inspection apparatus. It is a side view which shows the outline | summary of a band test | inspection apparatus when a rotating shaft is set to a slack position. It is explanatory drawing which shows the outline | summary of thickness information. It is sectional drawing of the band in thickness measurement line ST (j) set to measurement position MP1, and shows the outline | summary of distance A, B, and H. FIG. It is sectional drawing of the band in thickness measurement line ST (j) set to measurement position MP1, and shows the outline | summary of distance A and H, the thickness D of the band, and the floating amount CL. It is a flowchart which shows the outline | summary of a band test process. It is a side view which shows the outline | summary of a band test | inspection apparatus when a rotating shaft is set to the tension application position. It is explanatory drawing which shows the outline | summary of the distance which the sensor device of a ranging sensor detects when the curvature has not arisen in the band. It is explanatory drawing which shows the outline | summary of the distance which the sensor device of a distance measuring sensor detects when the curvature has arisen in the band.

  The band manufacturing equipment 10 shown in FIG. 1 and FIG. 2 creates a long band member 13 including a long central member 12 and side members 11 provided on both sides of the central member 12 in the width direction.

  The side member 11 and the central member 12 are metal sheet materials, respectively. The side member 11 is a narrow sheet material having a relatively narrow width. The side member 11 and the central member 12 are preferably formed from the same material, and more preferably formed through the same raw material and forming process. For example, as the side member 11 and the central member 12, it is preferable to use those formed from stainless steel.

  As the central member 12, a band that has been used as a conventional casting support may be used. The central member 12 is wider than the side member 11, and the width of the central member 12 in this embodiment is constant in the range of 1500 mm to 2100 mm, and the width of the side member 11 is constant in the range of 50 mm to 500 mm. is there.

  The band manufacturing facility 10 includes a delivery unit 16, a butting unit 17, a welding unit 18, a heating unit 19, and a winding device 20.

  The sending unit 16 includes a first sending device 23 that sends out the side member 11 and a second sending device 24 that sends out the central member 12, and sends the side member 11 and the central member 12 to the butting unit 17 independently. . The side member 11 wound in a roll shape is set in the first delivery device 23, and the side member 11 is unwound and sent to the butting portion 17. In the second delivery device 24, the central member 12 wound in a roll shape is set, and the central member 12 is unwound and sent to the butting portion 17.

  The abutting portion 17 abuts the side member 11 and the central member 12 that are independently guided so that the side edge 11e of the side member 11 and the side edge 12e of the central member 12 are in contact with each other. The abutting portion 17 includes a first roller 26 and a second roller 27 that are sequentially arranged on the conveying path of the central member 12 from the upstream side, a third roller 28 that is arranged on the conveying path of the side member 11, the side member 11 and It is preferable to have the 4th roller 29 distribute | arranged to a conveyance path so that both of the center members 12 may be supported.

  The fourth roller 29 is a butt that supports the fed side member 11 and the central member 12 at a butt position Ph where one side edge of the side member 11 and one side edge of the central member 12 start to contact each other. It is a support roller.

  The second roller 27 and the third roller 28 respectively adjust the conveyance path of the central member 12 and the conveyance path of the side member 11 so that the central member 12 and the side member 11 are in contact with each other on the peripheral surface of the fourth roller 29. To do.

  The 2nd roller 27 adjusts the conveyance path | route of the center member 12, and controls the passage path | route of the side edge 12e which should be welded with the side member 11 toward the abutting position Ph. The second roller 27 is movable in the width direction Y of the central member 12. The shift mechanism 32 moves the second roller 27 in the width direction Y.

  Between the second roller 27 and the fourth roller 29, there is position detecting means 34 for detecting the passing position of one of the side edges 12e of the central member 12 and sending a signal of the detected passing position to the controller 33. Arranged. The controller 33 obtains the displacement amount of the second roller 27 in the width direction Y based on the sent signal of the passing position, and sends the displacement amount signal to the shift mechanism 32. The shift mechanism 32 changes the inclination of the second roller 27 and the position of the second roller 27 in the width direction Y of the central member 12 based on the sent displacement amount signal. Thus, the central member 12 is displaced in the width direction Y by changing the inclination and position of the second roller 27.

  The first roller 26 is preferably provided with a shift mechanism 37. By this shift mechanism 37, the first roller 26 pushes the central member 12 toward the second roller 27 from one member surface. Depending on the amount of displacement of the first roller 26, the pressing force of the first roller 26 against the central member 12 changes, and the winding central angle of the central member 12 wound around the second roller 27 is adjusted by adjusting the pressing pressure. Can be controlled. By controlling the winding center angle, the amount of displacement of the central member 12 in the width direction Y by the second roller 27 can be controlled more precisely.

  The 3rd roller 28 adjusts the conveyance path of the side member 11, and adjusts the passage path of one side edge 11e which should be welded with the center member 12 toward the abutting position Ph. The third roller 28 is provided with a controller 38 that controls the orientation in the longitudinal direction. For example, the controller 38 moves the longitudinal direction of the third roller 28 to the side so that the angle θ1 formed by the circumferential direction in the contact area while in contact with the side member 11 and the transport direction X of the central member 12 changes. It changes along the member surface of the member 11.

  As described above, it is preferable to use the first roller 26 to the third roller 28 to control the butting position Ph on the fourth roller 29. The first roller 26 to the third roller 28 are preferably drive rollers that rotate in the circumferential direction. By rotating in the circumferential direction, the first roller 26 and the second roller 27 also function as a transport unit for the central member 12, and the third roller 28 also functions as a transport unit for the side member 11. By using the first roller 26 to the third roller 28 as driving rollers, the control of the conveyance path between the side member 11 and the central member 12 becomes more reliable, and the first roller 26 between the side member 11 and the central member 12 becomes more reliable. The slip on the third roller 28 is prevented and the member surface is prevented from being damaged.

The welding unit 18 welds the side member 11 and the central member 12 supplied from the butt portion 17 in a state where the side edges 11e and 12e are in contact with each other. By being continuously supplied from the abutting portion 17, a longitudinal welding process of welding the side member 11 and the central member 12 in the longitudinal direction can be performed. The welding unit 18 includes a welding device 42. Examples of the welding device 42 include a laser welding device. As the laser welding apparatus, for example, a CO ₂ laser welding apparatus or a YAG laser welding apparatus can be used. In this embodiment, a case where a CO ₂ laser welding apparatus is used as the welding apparatus 42 will be described.

The welding device 42 emits the condensed laser light and irradiates the side member 11 and the central member 12 as irradiation targets with the laser light, thereby melting and joining the side member 11 and the central member 12. The welding apparatus 42 includes a laser oscillator 43, a welding apparatus main body 46 that collects and emits laser light guided from the laser oscillator 43, and a gas supply unit that supplies CO ₂ gas when irradiating the laser light ( (Not shown). The CO ₂ gas prevents oxidation of the side member 11 and the central member 12. In FIG. 2, the illustration of the laser oscillator 43 is omitted to avoid complication of the drawing.

  A TIG welding (Tungsten Inert Gas welding) apparatus may be used instead of the laser welding apparatus. As is well known, TIG welding is one type of welding arc welding that uses an arc as a heat source, and is a type of inert gas arc welding that uses inert gas (inert gas) as a shielding gas and tungsten or a tungsten alloy as an electrode. is there. Laser welding is more preferable than TIG welding. Moreover, it is good also as hybrid welding which combined TIG welding and laser welding.

  A welding support roller 41 for supporting the side member 11 and the central member 12 on the circumferential surface is provided in the conveyance path between the side member 11 and the central member 12 so as to face the laser beam exit of the welding apparatus main body 46. is there. The rotation axis of the welding support roller 41 is parallel to the width direction Y of the side member 11 and the central member 12. The support position of the side member 11 and the central member 12 by the welding support roller 41 is set so that the side member 11 and the central member 12 while being supported by the peripheral surface of the welding support roller 41 are irradiated with laser light. It is preferable to do. That is, it is preferable to perform welding on the welding support roller 41. Thereby, the side member 11 and the central member 12 are stabilized in a state in which the side edges 11e and 12e are in contact with each other, and the laser beam can be reliably irradiated to the portion to be irradiated.

  The welding apparatus body 46 is preferably provided with a shift mechanism 50 for displacement in the width direction Y. A contact position Ps (see FIG. 5) where the side edge 11e of the side member 11 and the side edge 12e of the central member 12 are in contact with each other is detected on the upstream side of the welding device 42, and the detected contact position Ps (see FIG. 5) is detected. ) Position detecting means 47 is provided for sending the signal (1) to the controller 51. The position detection means 47 should just be distribute | arranged to the conveyance path vicinity from the butting position Ph to the welding apparatus 42 (for example, welding position Pw).

  The controller 51 obtains the displacement amount of the welding apparatus main body 46 in the width direction Y based on the sent signal of the contact position Ps (see FIG. 5), and sends the displacement amount signal to the shift mechanism 50. When the conveyance speed signal between the side member 11 and the central member 12 is input, the controller 51 sends a displacement timing signal together with a displacement timing signal to the displacement mechanism 50 to the displacement mechanism 50. The shift mechanism 50 changes the position of the welding apparatus main body 46 at a predetermined timing based on the received displacement amount and displacement timing signal. Thus, by changing the position of the welding apparatus main body 46 in the width direction Y, the irradiation position of the laser beam is controlled more precisely, and the side member 11 and the central member 12 are more reliably welded. In addition, the conveyance speed of the side member 11 and the central member 12 to the welding apparatus 42 in this embodiment is set as a range of 0.15 m / min or more and 20 m / min or less.

  As shown in FIG. 1, the welding unit 18 is more preferably provided with a chamber 52 that partitions the welding device main body 46 and the welding support roller 41 from the external space, and a cleaning device 55 that cleans the gas. In FIG. 2, the illustration of the chamber 52 and the cleaning device 55 is omitted to avoid complication of the drawing. The chamber 52 is provided with a first opening (not shown) for letting out the internal gas to the outside and a second opening (not shown) for guiding the gas cleaned by the cleaning device 55 to the inside. The first opening and the second opening are each connected to the cleaning device 55. The gas inside the chamber 52 is guided to the cleaning device 55 from the first opening, and the cleaning device 55 cleans the gas guided from the chamber 52 and sends it to the chamber 52 through the second opening. In this way, the internal gas of the chamber 52 is circulated with the cleaning device 55.

  By cleaning the internal gas of the chamber 52, the welding position Pw and its periphery are cleaned, and foreign matter and the like are prevented from being mixed into the welded portion 13w. Note that, by keeping the pressure inside the chamber 52 higher than the pressure in the external space, the inside of the chamber 52 can be reliably held in a clean state. Further, by setting the welding position Pw to a relatively high position with respect to the delivery unit 16, the butting unit 17, the heating unit 19, and the winding device 20, it is possible to further prevent foreign matters from being guided from these positions. it can.

  The cleanliness inside the chamber 52 is preferably, for example, class 1000 or less, more preferably class 100 or less, according to the US Federal Standard FED-STD-209D.

  The heating unit 19 is preferably provided on the downstream side of the welding unit 18. The heating part 19 will not be specifically limited if it heats the welding part 13w of the band member 13 obtained by welding so that it may become a fixed temperature range. There may be a case where stress due to distortion caused by welding remains inside the welded portion 13w and its periphery. The stress can be removed by heating the welded portion 13w and the periphery thereof by the heating unit 19. By removing the stress, deformation of the welded portion 13w can be suppressed even when the solution casting method is performed continuously for a long time.

  Although the temperature of the welding part 13w by the heating of the heating part 19 will not be specifically limited if it is the temperature from which stress is removed, For example, when the band member 13 consists of stainless steel, the temperature of the welding part 13w is 100 degreeC or more. It is preferably 200 ° C. or lower, and more preferably 120 ° C. or higher and 180 ° C. or lower.

  As the heating unit 19, for example, there is a blowing means. As shown in FIG. 1, the blowing means as the heating unit 19 includes a duct 56 that blows out a gas having a constant temperature, and a blower 57 that sends the gas to the duct 56 after controlling the temperature of the gas. In FIG. 2, the illustration of the duct 56 and the blower 57 is omitted to avoid complication of the drawing.

  The heating unit 19 may be provided on the opposite side of the welding support roller 41 as shown in FIG. 1 with respect to the conveyance path of the band member 13 or may be provided on the same side as the welding support roller 41.

  The band member 13 from which the stress has been removed is sent to the winding device 20 downstream of the heating unit 19 and wound up in a roll shape. In the winding device 20, a winding core for winding the band member 13 is set, and driving means for rotating the winding core in the circumferential direction is provided.

  The winding device 20 also functions as a welding tension control means for controlling the tension between the band member 13, the side member 11, and the central member 12 at the welding position Pw. Therefore, it is preferable to control the torque of the winding device 20 so that the tension between the band member 13, the side member 11, and the central member 12 at the welding position Pw is kept constant. Thereby, the welding part 13w can be made into a fixed state in a longitudinal direction.

  When starting welding, it is preferable to use the winding device 20 as follows, for example. First, the side member 11 and the central member 12 are set on the conveyance path from the delivery unit 16 to the winding device 20, and the respective ends of the side member 11 and the central member 12 are wound around the winding core of the winding device 20. Winding of the side member 11 and the central member 12 is started. Winding is started, the conveyance path between the side member 11 and the central member 12 is controlled, and the butting position Ph is held at a predetermined position. After the abutting position Ph between the side member 11 and the central member 12 is held constant, welding is started by the welding device 42.

  It is preferable that the welding is performed while suppressing the positional deviation among the side member 11, the central member 12, and the band member 13. For example, instead of the welding unit 18, a welding unit 61 as shown in FIGS. 3 and 4 provided with a pressing device may be used. The welding unit 61 further includes a pressing device 62 in addition to the welding unit 18 shown in FIGS. 1 and 2, and includes a shift mechanism 50, a controller 51, a chamber 52, and a cleaning device 55 in the same manner as the welding unit 18. In order to avoid complication of illustration, these illustrations are omitted in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2 and description thereof is omitted. In the welding unit 61, the chamber 52 surrounds the pressing device 62 and the welding support roller 41 so as to partition from the external space.

  The pressing device 62 suppresses misalignment of the side member 11, the central member 12, and the band member 13 at the welding position Pw, and is welded by a pair of belts including a first belt 63 and a second belt 64. The side member 11, the central member 12, and the band member 13 on the support roller 41 are pressed.

  The first belt 63 and the second belt 64 are endless belts formed in an annular shape. The first belt 63 and the second belt 64 are wound around the circumferential surfaces of the fifth roller 67 to the seventh roller 69 so as to be aligned in the longitudinal directions of the fifth roller 67 to the seventh roller 69. At least one of the fifth roller 67 to the seventh roller 69 is a drive roller that rotates in the circumferential direction. Due to the rotation of the driving roller, the first belt 63 and the second belt 64 are conveyed while maintaining a conveyance path parallel to each other.

  The fifth roller 67 to the seventh roller 69 are arranged so that the rotation axis thereof is parallel to the rotation axis of the welding support roller 41.

  The fifth roller 67 to the seventh roller 69 are arranged in a region opposite to the side on which the fourth roller 29 and the welding support roller 41 are arranged with respect to the conveyance path between the side member 11 and the central member 12. . The fifth roller 67 is provided so as to face the conveyance path between the side member 11 and the central member 12 from the fourth roller 29 toward the welding support roller 41. The sixth roller 68 is provided so as to face the conveyance path between the side member 11 and the central member 12 from the welding support roller 41 toward the heating unit 19. The seventh roller 69 is appropriately arranged so as to determine the conveyance path of the first belt 63 and the second belt 64 from the sixth roller 68 to the fifth roller 67.

  The fifth roller 67 and the sixth roller 68 are the first belt 63 and the second belt 64 that are directed from the fifth roller 67 to the sixth roller 68, and the side member 11, the central member 12, and the band on the welding support roller 41. It arrange | positions so that it may convey so that the member 13 may be pressed. For example, when the side member 11 and the central member 12 on the welding support roller 41 are welded from above, the lower end of each of the fifth roller 67 and the sixth roller 68 is higher than the upper end of the welding support roller 41. Also, it is arranged to be in a low position.

  The fifth roller 67 and the sixth roller 68 are arranged so that the conveyance path of the first belt 63 faces the conveyance path between the side member 11 and the side portion 13s of the band member 13 formed from the side member 11, and The transport path of the second belt 64 is provided so as to face the transport path between the central member 12 and the central portion 13c of the band member 13 formed from the central member 12. Accordingly, the first belt 63 presses the side member 11 and the side portion 13s against the welding support roller 41, and the second belt 64 presses the center member 12 and the center portion 13c against the welding support roller 41, respectively.

  As described above, the first belt 63 and the second belt 64 are provided to face the welding support roller 41, respectively, so that the heights of the side member 11 and the central member 12 at the welding position Pw are equal. Press. The height of the side member 11 and the central member 12 is the height of the surface of each member 11 and 12. By pressing the side member 11 and the central member 12 so that the heights are equal to each other and performing welding in this state, the aspect of the welded portion 13w becomes more uniform in the longitudinal direction and welding is more reliably performed. Can be done.

  The longitudinal welding process will be described in more detail with reference to FIGS. The first belt 63 and the second belt 64 are conveyed in a state of being separated from each other. The conveyance path is set so that the welding position Pw passes through the gap between the first belt 63 and the second belt 64 for the first belt 63 and the second belt 64. Thereby, the contact position Ps at which the side edge 11e of the side member 11 and the side edge 12e of the central member 12 are in contact with each other passes through the gap between the first belt 63 and the second belt 64, as shown in FIG. Welding is performed between the first belt 63 and the second belt 64. In addition, illustration of the welding apparatus main body 46 is abbreviate | omitted in FIG.

  The distance D1 between the first belt 63 and the second belt 64 is preferably in the range of 6 mm to 12 mm. In the cross section in the width direction Y between the side member 11 and the central member 12, the distance D2 between the contact position Ps and the first belt 63 and the distance D3 between the contact position Ps and the second belt 64 are 3 mm or more and less than 6 mm, respectively. It is preferable to set it as the range.

  Instead of the pressing device 62, rollers (not shown) having a rotation axis parallel to the rotation axis of the welding support roller 41 may be arranged upstream and downstream of the welding device main body 46, respectively. In this case, the side member 11 and the central member 12 at the welding position Pw can be pressed by pressing the side member 11 and the central member 12 with one upstream roller and pressing the band member 13 with the other downstream. it can.

  As shown in FIG. 6, a weld bead 72 is formed at the contact position Ps and the periphery thereof by melting by the heat of the welding device 42. Heat is transmitted from the weld bead 72 to both sides, and a heat-affected region 73 is generated in each of the side member 11 and the central member 12 that is affected by heat in welding. The heat-affected area 73 may immediately show a different property from other areas that are not affected by heat or may show over time. For example, when a material having such a wide thermal effect is used as a casting support, the welded part 13w is deformed or the casting film is foamed when the solution casting method is continuously performed for a long time. And other harmful effects occur.

  Therefore, as shown in FIG. 5, in the peripheral region of the welding support roller 41, a high heat conduction portion made of a material having higher heat conductivity than the side member 11 and the central member 12 is in a passage region through which the contact position Ps passes. 71 is preferably formed. Thereby, the heat from the welding apparatus 42 (refer FIG. 3, FIG. 4) can be spread | diffused more quickly. In order to diffuse heat more quickly on the side of the welding support roller 41, the width of the heat affected area 73 between the side member 11 and the central member 12 can be made smaller or the depth of the heat affected area 73 can be made shallower.

  It is preferable that the width D4 of the passage region used as the high heat conducting portion 71 is in a range of 26 mm or more and 32 mm or less.

  Furthermore, it is more preferable that high heat conductive portions made of a material having higher thermal conductivity than the side member 11 and the central member 12 are formed on both surfaces of the first belt 63 and the second belt 64. Thereby, the magnitude | size of the heat affected zone 73 can be made small in the width direction or the thickness direction.

  It is preferable that the side edge 11e of the side member 11 and the side edge 12e of the central member 12 are in close contact with each other so that the gap is 0 (zero) at the welding position Pw. Therefore, it is preferable that the side member 11 and the central member 12 are formed in advance so as not to generate a gap when the side edges 11e and 12e are brought into contact with each other. Thereby, the band member without a space | gap in a welding part can be manufactured more reliably.

  The above-described longitudinal welding process may be only a continuous welding process in which welding is continuously performed in the longitudinal direction of the side member 11 and the central member 12, and in addition to this, intermittent welding in which welding is intermittently performed. A welding process may be performed. When intermittently welding, the side member 11 and the central member 12 that are continuously sent to the welding device 42 are welded intermittently. Such an intermittent welding process is preferably performed before the continuous welding process. In this case, in the intermittent welding process, first, the side member 11 and the central member 12 may be temporarily joined, and then joined over the entire longitudinal direction in the continuous welding process.

  When temporary joining is performed in the intermittent welding process and then joining is performed in the continuous welding process, the side member 11 and the central member 12 are guided to the welding unit 18 from the butt portion 17 (see FIGS. 1 and 2), and intermittently. Weld to. In addition, when the side member 11 and the central member 12 are provided with a surface corresponding to a casting surface when used as a subsequent casting support and a back surface corresponding to a non-casting surface, intermittent The welding in the welding process is preferably performed on the back surface. Then, the side member 11 and the central member 12 are conveyed so that a back surface may pass facing the welding apparatus main body 46 (refer FIG. 1).

  After performing an intermittent welding process, it guides to the winding device 20 and winds up. In addition, you may heat with the heating part 19 with respect to a welding part before winding. A temporary joining member (not shown) made up of the side member 11 and the central member 12 wound through the intermittent welding process is unwound by a feeding device (not shown) and sent to the welding unit 18 again. This feeding is performed so that the surface of the temporary welding member passes facing the welding apparatus main body 46 (see FIG. 1). The welding unit 18 performs continuous welding to obtain the band member 13. In place of this method, the two welding units 18 are arranged side by side relatively upstream and downstream, intermittent welding is performed by one upstream welding unit 18, and continuous welding is performed by the other downstream welding unit 18. May be implemented.

  When welding is performed, the weld bead 72 may be formed so as to be higher than the side member 11 and the central member 12. Therefore, as shown in FIG. 5, the welding support roller 41 used in the case where the first process of welding one surface in the longitudinal direction and the second process of welding the other surface in the longitudinal direction are performed as shown in FIG. Further, it is preferable that a groove 76 is formed in a passing region through which the contact position Ps passes on the peripheral surface of the welding support roller 41. It is good to carry out the 2nd process by conveying the side member 11 and the central member 12 so that the welding part formed from the welding beat 72 raised in the 1st process may pass this groove | channel 76. FIG. Thereby, the band member 13 that is smoother and has less residual stress can be obtained. Therefore, even when used in solution casting, it is possible to more reliably produce a film in which the band as a casting support is less deformed and changes in properties, the casting membrane does not foam, and the thickness is not uneven.

  The width D5 of the groove 76 is preferably in the range of 6 mm to 12 mm, and the depth D6 of the groove may be about 1 mm.

  In the above embodiment, the third roller 28 is used as means for adjusting the conveyance path of the side member 11 in the abutting portion 17, but instead of the third roller 28, a tapered roller 81 as shown in FIG. 7 may be used. The taper roller 81 is a roller having a circular cross section formed so that the diameter d continuously decreases gradually from one end to the other end. The diameter d gradually decreases gradually from one end to the other end at a constant rate. The taper roller 81 is arranged so that one end with a large diameter d faces the conveyance path of the central member 12 and the other end with a small diameter d faces the side opposite to the central member 12 (conveyance path side of the side member 11).

  The side member 11 being conveyed comes into contact with the taper roller 81, thereby changing the conveyance path to the direction of the arrow A toward the central member 12, and approaching the central member 12. Thereby, the side member 11 is reliably conveyed toward the butting position Ph (refer FIG. 1, FIG. 2).

  The taper roller 81 is preferably provided with driving means 82 that rotates in the circumferential direction. The rotating shaft is formed through the center of one end surface and the center of the other end surface. By conveying the side member 11 by the taper roller 81 rotated by the driving means 82, the side member comes closer to the central member 12 more effectively.

  Instead of the third roller 28, a clip 85 as gripping means as shown in FIG. 8 may be used. The clip 85 includes a clip body 86 opened in a U-shape and a pair of sandwiching pins 87 provided at the respective distal end portions of the clip body 86, and grips and holds the side member 11. The pinching pin 87 is provided so as to be movable between a pinching position for pinching the side member 11 and a retreating position for retreating from the pinching position. The clip 85 includes a moving mechanism 88 and is movable between a grip start position where gripping is started and a grip release position where gripping is released. The clip 85 is also movable in the width direction Y.

  The clip 85 grips the side member 11 when the pinching pin 87 moves to the pinching position at the gripping start position. The clip 85 is conveyed downstream while approaching the direction A toward the central member 12 with the side member 11 being gripped.

  The taper roller 81 and the clip 85 may be used to bring the central member 12 closer to the side member 11 in addition to being used to bring the side member 11 closer to the central member 12. In this case, the central member 12 may be supported or conveyed by the taper roller 81 and the clip 85.

  In the above embodiment, the both side members 11 are welded to the central member 12 at the same time. However, after the one side member 11 is welded to the central member 12, the other side member 11 may be welded to the central member 12. .

  As shown in FIG. 9, a band 91 used as a casting support is an endless band that is formed into an annular shape. The band 91 is formed by welding one end and the other end in the longitudinal direction of the band member 13. The band member 13 for forming the band 91 may be cut to a predetermined length, or when the band member 13 is made from the side member 11 and the central member 12 that have been cut to a predetermined length in advance. The band 91 may be made as it is without cutting. The diameter of the pinhole in the weld is preferably less than 40 μm.

  The band member 13 is preferably cut in a direction crossing the width direction Y. More preferably, the cut direction is such that the angle formed with the width direction Y is in the range of approximately 5 ° to 15 °. The angle θ2 formed by the welded portion 91v where one end and the other end in the longitudinal direction of the band member 13 thus cut are welded and the width direction Y is in a range of approximately 5 ° to 15 °. As described above, in the annular welding process in which the long band member 13 is annular, the welding apparatus 42 used in the longitudinal welding process may be used, or other known welding apparatuses may be used.

  The band 91 manufactured by welding includes a side portion 91s formed from the side member 11 (see FIGS. 1 to 8) and a center portion 91c formed from the central member 12 (see FIGS. 1 to 8). The welded portions 91w of the side portions 91s and the central portion 91c are exposed on the band front surface 91a and the back surface 91b. The welded portion 91w is a portion corresponding to the welded portion 13w. The linear welded portion 91 w is preferably provided so as to be parallel to the longitudinal direction of the band 91. The width of the band 91 thus obtained is in the range of 2000 mm to 3000 mm.

  The obtained band 91 is used for a solution casting facility after the surface is polished to a mirror surface. Next, a method for producing a film in a solution casting apparatus will be described below. The kind of polymer is not particularly limited, and a known polymer that can be formed into a film by solution casting may be used. In the following embodiments, a case where cellulose acylate is used as a polymer will be described as an example.

  As shown in FIG. 10, the solution casting apparatus 110 includes a film forming apparatus 117 that forms a film 116 from a dope 113 in which cellulose acylate 111 is dissolved in a solvent 112, and each side portion of the film 116 is held by a holding means 120a. The first tenter 120 that advances drying, a roller drying device 124 that dries while supporting the film 116 with a plurality of rollers 122, and each side portion of the film 116 is held by the holding means 125a, and tension in the width direction is maintained. A second tenter 125 applied to the film 116, a slitter 126 that cuts out each ear held by the holding means 125a of the second tenter 125, and a film 116 from which the ear is cut are wound around a winding core into a roll shape. And a winding device 127 to be provided in order from the upstream side.

  The film forming apparatus 117 includes a pair of film forming rollers 131 and 132 that rotate in the circumferential direction. The pair of film forming rollers 131 and 132 are arranged so as to be parallel to each other on a horizontal plane, and a band 91 is wound around the film forming roller 131 and the film forming roller 132. The film forming roller 131 is a drive roller, and the film forming roller 132 is a free roller. The film forming rollers 131 and 132 are respectively provided with a first controller (not shown) and a second controller (not shown) for controlling the peripheral surface temperature to a predetermined temperature.

  The film forming device 117 is sequentially provided with a casting die 133 that flows out the dope 113 from the upstream side toward the downstream side in the moving direction of the band 91, a film drying device 134, and a peeling roller 135.

  As shown in FIGS. 11 and 12, the casting die 133 flows down the dope 113 (see FIG. 10) toward the surface 91a (hereinafter referred to as the band surface) 91a supported by the film-forming roller 131. The outlet 133a from which the dope 113 (see FIG. 10) flows out is provided at the tip. The casting die 133 is arranged so that the outlet 133 a faces the band surface 91 a of the band 91.

  The dope 113 (see FIG. 10) flowing down from the casting die 133 lands at the arrival position DP on the band surface 91a. Since the band 91 is in a moving state, the dope 113 (see FIG. 10) that has landed at the arrival position DP is flowed and extended in the casting area CA set on the band surface 91a. Thus, a casting film 136 made of the dope 113 (see FIG. 10) and having a casting width CW is formed in the casting area CA.

The casting die 133 is arranged so that the arrival position DP is a position as described below. As shown in FIGS. 11 and 13, the reaching position DP is set to a portion of the band surface 91a supported by the film forming roller 131. The arrival position DP is preferably set on the upstream side in the movement direction of the band 91 from the top TP of the film forming roller 131. Further, the surface _{L TP} extending toward the top portion TP from the rotation center _{O 131a} of the rotating shaft 131a, the angle φ1 of the surface _{L DP} and the angle from the rotation center _{O 131a} extending toward the arrival position DP of the rotary shaft 131a is It is preferably 0 ° or more and 45 ° or less.

  As shown in FIG. 10, the membrane drying apparatus 134 includes a first duct 141 to a third duct 143. The first duct 141 to the third duct 143 that send the drying air toward the casting film 136 are sequentially arranged along the moving path of the band 91 from the upstream side. The first duct 141 is provided on the band surface 91 a side and the band back surface 91 b side of the band 91 that moves from the film forming roller 131 toward the film forming roller 132. The second duct 142 is provided on the band surface 91 a side of the band 91 supported by the film forming roller 131. The third duct 143 is provided on the band surface 91 a side and the band back surface 91 b side of the band 91 that moves from the film forming roller 132 toward the film forming roller 131.

  The first to third ducts 141 to 143 are each connected to a blower (not shown). A blower controller (not shown) that independently controls the temperature, humidity, and flow rate of the gas supplied to each of the first duct to the third ducts 141 to 143 is connected to the blower. The first duct to the third ducts 141 to 143 are provided with outlets for sending the gas supplied from the blower as dry air. The outlets provided in the first to third ducts 141 to 143 are formed so as to face the band surface 91a and the back surface 91b.

  Outflow ports provided in the first duct 141 to the third duct 143 are formed in a slit shape and extend from one end of the band 91 to the other end. The length of each outlet in the width direction of the band 91 may be such that the entire casting film 136 is exposed to dry air.

  The temperature of the drying air is preferably lowered as it goes from the upstream side to the downstream side of the moving path of the band 91. The temperature of the drying air from the first duct 141 is preferably 50 ° C. or more and 140 ° C. or less, the temperature of the drying air from the second duct 142 is preferably 50 ° C. or more and 140 ° C. or less, and the third The temperature of the drying air from the duct 143 is preferably 40 ° C. or higher and 100 ° C. or lower.

As shown in FIG. 11, the film-forming roller 131 includes a rotating shaft 131a and a roller body 131b that is pivotally attached to the rotating shaft 131a. The film forming roller 132 has the same structure as the film forming roller 131. As shown in FIG. 12, a motor 171 and a drive unit 172 are connected to the rotating shaft 131a. The film-forming roller 131 is rotated about the rotation shaft 131a by the motor 171. The drive unit 172 applies an external force from the film forming roller 132 (see FIG. 10) toward the film forming roller 131 to the rotating shaft 131a. By applying an external force F1 to the rotating shaft 131a, the moving tension T1 is applied to the band 91. A load cell 173 is attached to the rotating shaft 131a. The load cell 173 detects the magnitude of the external force F1 received by the rotating shaft 131a. The control unit (not shown) calculates the moving tension T1 by dividing the external force F1 detected by the load cell 173 by the value stored in the internal memory. The size of the moving tension T1 may be determined according to the size of the band 91 and the moving path, and is, for example, 60 N / mm ² .

  Next, a solution casting method performed in the solution casting equipment 110 will be described. In the solution casting method, a film forming process, a film drying process, a stripping process, and a film drying process are sequentially performed.

  In the film forming step, as shown in FIG. 11, the casting die 133 continuously flows out the dope 113 (see FIG. 10) to the band surface 91a. Through the film formation process, a casting film 136 made of the dope 113 and having a casting width CW (see FIG. 12) is formed in the casting area CA (see FIG. 12).

  As shown in FIGS. 10 and 11, in the membrane drying step, the first duct 141 faces the casting membrane 136 and the back surface 91b of the band 91, the second duct 142 faces the casting membrane 136, and the third duct. 143 sends out the drying air toward the casting film 136 and the back surface 91b of the band 91, respectively. When the drying air hits the casting film 136, the solvent evaporates from the casting film 136. In addition, as a result of the band back surface 91b being heated by the contact with the dry air, the solvent in the casting film 136 is promoted. Further, the temperature of the peripheral surface of the film-forming roller 132 is adjusted by the second controller so as to be higher than the temperature of the casting film 136. As a result of the band 91 being heated from the band back surface 91 b side by contact with the film forming roller 132, heat from the film forming roller 132 is transmitted to the casting film 136. Thus, the solvent in the cast film 136 is promoted.

  In the stripping step, the casting film 136 that has been transported to the first tenter 120 by evaporation of the solvent is peeled off from the band 91 in a state containing the solvent. At the time of stripping, the film 116 is supported by the stripping roller 135, and the stripping position PP where the casting film 136 is stripped from the band 91 is kept constant. The stripping roller 135 may be a driving roller that includes driving means and rotates in the circumferential direction.

  The band 91 from which the casting film 136 has been peeled is at a higher temperature than the dope 113 flowing out from the casting die 133 by the film drying device 134. If the dope 113 flows out of the band 91 as it is, foaming of the dope 113 occurs. Therefore, using the first controller, the temperature of the peripheral surface of the film forming roller 131 is adjusted to be lower than that of the dope 113 flowing out from the casting die 133. As a result, the band 91 supported by the film forming roller 131 has a temperature lower than that of the dope 113 flowing out from the casting die 133, so that foaming of the dope 113 can be prevented.

  The cast film 136 peeled off, that is, the film 116 is sequentially guided to the first tenter 120, the roller drying device 124, and the second tenter 125. In the first tenter 120, the roller drying device 124, and the second tenter 125, a film drying process in which the film 116 comes into contact with a predetermined dry gas is performed. The film 116 is dried by the film drying process.

  The slitter 126 performs an ear-cutting process for cutting off the ear portion of the film 116. The film 116 from which the ears have been cut is rolled by the winding device 127.

(Band inspection device)
Next, for the band 91 manufactured by the band manufacturing facility 10 (see FIG. 1), a band inspection for inspecting whether or not thickness unevenness occurs due to warping of the band when used in the solution casting method. The apparatus will be described.

  As shown in FIGS. 14 and 15, the band inspection apparatus 200 includes a pair of inspection rollers 201 and 202, a shift unit 203, a motor 205, a drive unit 206, a load cell 207, a sensor unit 208, And a control unit 210 (see FIG. 16).

  The pair of inspection rollers 201 and 202 are for winding the band 91 to be inspected, and are arranged so as to be parallel to each other on a horizontal plane. The inspection roller 201 is a drive roller, and the inspection roller 202 is a free roller. The inspection rollers 201 and 202 preferably have the same shape and dimensions as the film forming rollers 131 and 132. For example, the diameters of the inspection rollers 201 and 202 are preferably the same as the diameters of the film forming rollers 131 and 132.

Even when the diameter of the inspection roller is different from the diameter of the film forming roller, the normal stress acting on the band wound around the film forming roller is the normal stress acting on the band wound around the film forming roller. The present invention can be applied under the same condition. The normal stress N acting on the band wound around the roller of diameter Dr can be expressed by the following equation. Here, T1 is the band moving tension, and THb is the band thickness.
N = THb × T1 / 0.5Dr

  The inspection roller 201 includes a rotation shaft 201a and a roller body 201b that is attached to the rotation shaft 201a. The inspection roller 202 includes a rotating shaft 202a and a roller body 202b that is pivotally attached to the rotating shaft 202a.

  The rotary shaft 202a includes a tension application position Pt where a predetermined tension is applied to the band 91 spanned over the inspection rollers 201 and 202, and a slack position Pr where the band 91 spanned over the inspection rollers 201 and 202 relaxes. (See FIG. 17). The shift unit 203 shifts the rotation shaft 202a between the tension application position Pt and the slack position Pr under the control of a shift control unit (not shown).

  The band 91 to be inspected is wound around the inspection roller 201 and the inspection roller 202. Of the peripheral surface 201bx of the roller body 201b, the axial center portion 201bc supports the band back surface 91b. Of the peripheral surface 201bx of the roller body 201b, the axial end 201be is exposed.

  The rotating shaft 201 a is connected to the motor 205. By the motor 205, the roller body 201b rotates around the rotation shaft 201a. The drive unit 206 applies an external force F2 from the roller body 202b toward the roller body 201b to the rotation shaft 201a. By applying the external force F2 to the rotating shaft 201a, the moving tension T2 is applied to the band 91 that is stretched around the inspection rollers 202 and 201. The load cell 207 detects the magnitude of the external force F2 received by the rotating shaft 201a.

On the band surface 91a of the band 91 supported by the inspection roller 201, a measurement position MP1 extending in the width direction of the band 91 is set. The measurement position MP1 corresponds to the arrival position DP (see FIG. 11). That is, the surface _{M TP} and the rotation shaft 201a rotation center _{O 201a} from extending toward the measuring position MP1 plane _{M MP1} and the angle formed extending toward the top portion TP of the inspection roller 201 from the rotation center _{O 201a} of the rotary shaft 201a The angle φ2 is equal to the angle φ1 (see FIG. 11).

A measurement position MP2 is set on the peripheral surface 201bx. Measurement position MP2 is line of intersection between the axial end portions 201be of the surface _{M MP1.}

The sensor unit 208 is a band surface 91a side of the band 91 is preferably disposed on the surface _{M MP.} The sensor unit 208 includes a measurement window 208a that faces the measurement position MP1. The measurement window 208 a extends in the width direction of the band 91 from one end to the other end in the axial direction of the roller body 201 b that supports the band 91.

  The sensor unit 208 includes a distance measuring sensor 208x that measures a distance from the measurement window 208a to the measurement position MP1 and a distance from the measurement window 208a to the measurement position MP2, and a reference position set on the band surface 91a. And a reference position detection sensor 208y for detecting whether or not it is on MP1. The distance measuring sensor 208x includes a sensor device (not shown), a built-in CPU (not shown), and a built-in memory (not shown). As the reference position detection sensor 208y, for example, a reflective photosensor can be used. The reference position set on the band surface 91a will be described later.

  Thickness measurement lines ST (j) [j = 1, 2, 3,..., N] extending in the width direction of the band 91 are set so as to be aligned in the longitudinal direction of the band 91. Further, the thickness measurement lines SM (i) [i = 1, 2, 3,..., M] extending in the longitudinal direction of the band 91 are set to be aligned in the width direction of the band 91. Note that the interval between adjacent thickness measurement lines ST and the interval between adjacent thickness measurement lines SM are set to predetermined values in advance.

  As illustrated in FIG. 16, the control unit 210 includes a CPU 211, a storage unit 212, a distance calculation unit 216, a floating amount calculation unit 217, and a determination unit 218.

  The CPU 211 is electrically connected to the storage unit 212 and the units 216 to 218 via the bus 222. The storage unit 212 stores programs and data. Examples of the program stored in the storage unit 212 include a band inspection program. The data stored in the storage unit 212 includes band thickness information 225 (see FIG. 18), a threshold TH1, a moving tension T1, and the like.

  As shown in FIG. 18, the band thickness information 225 includes position information MD of each thickness measurement line ST (see FIG. 15) and thickness distribution information DB of the band 91 in each thickness measurement line ST (see FIG. 15). It consists of. The position information MD represents a distance L (j) (see FIG. 15) from the reference position B1 (see FIG. 15) to an arbitrary thickness measurement line S (j) in the longitudinal direction of the band 91. Here, the reference position B1 is the welded portion 91v (see FIG. 15) exposed on the band surface 91a.

  The thickness distribution information DB includes the measurement values D of the thickness of the band 91 at each intersection P between the thickness measurement line ST and the thickness measurement line SM, and the measurement values D are grouped for each thickness measurement line ST. For example, when the measured value of the thickness of the band 91 at the intersection P (i, j) between the arbitrary thickness measurement line ST (j) and the arbitrary thickness measurement line SM (i) is represented as D (i, j), the arbitrary D (1, j), D (2, j), D (3, j),..., D (i−1) are included in the thickness distribution information DB (j) for the thickness measurement line ST (j). , J), D (i, j), D (i + 1, j)..., D (m, j). The measured value D (i, j) can be obtained in advance by an ultrasonic sensor or the like.

As shown in FIG. 16, the distance calculation unit 216 calculates a distance H (see FIG. 19) from the peripheral surface 201bx of the roller main body 201b to the band surface 91a by the equation (2).
Formula (2) H = BA
A is the distance from the measurement window 208a to the measurement position MP1 (see FIG. 19), and B is the distance from the measurement window 208a to the measurement position MP2 (see FIG. 19).

The floating amount calculation unit 217 calculates the floating amount CL (see FIG. 20) from the circumferential surface 201bx to the band back surface 91b by the equation (1).
Formula (1) CL = HD

  The determination unit 218 determines whether all of the CL calculated by the floating amount calculation unit 217 are equal to or less than the threshold value TH1. The threshold value TH1 is stored in the storage unit 212. The threshold value TH1 may be determined according to the target quality of the band 91. In the solution casting method, it is preferable to set the threshold value TH1 to 0.1 mm or less in order to suppress the thickness unevenness failure, the remaining peeling failure due to the thickness unevenness failure, and foaming.

  Next, the band inspection process 230 (see FIG. 21) in the band inspection apparatus 200 shown in FIG. 14 will be described.

  First, the shift unit 203 sets the rotation shaft 202a to the slack position Pr (see FIG. 17). The band 91 to be inspected is passed over the inspection rollers 201 and 202. Thereafter, the shift unit 203 sets the rotation shaft 202a to the tension application position Pt (S10 in FIG. 21).

  As shown in FIGS. 15 and 16, the drive unit 206 applies an external force F <b> 2 to the rotation shaft 201 a under the control of the control unit 210. The load cell 207 detects the external force F2. The control unit 210 reads the external force F2 from the load cell 207 and reads the value BS from the storage unit 212. The value BS is obtained by multiplying the average cross-sectional area Sav of the band 91 by 2. Next, the control unit 210 calculates the moving tension T2 by dividing the external force F2 by the value BS. Then, the control unit 210 adjusts the magnitude of the external force F2 so that the calculated movement tension T2 is equal to the movement tension T1 read from the storage unit 212. In this way, the same movement tension as that during film formation is applied to the band 91 (S11 in FIG. 21).

  As shown in FIGS. 14 and 15, when the motor 205 rotates the rotation shaft 201a, the band 91 moves in the longitudinal direction. The reference position detection sensor 208y emits test light to the measurement position MP1 using a light source. The test light emitted from the reference position detection sensor 208y is reflected at the measurement position MP1, and enters the measurement window 208a as reflected light. The reference position detection sensor 208y detects the amount of reflected light incident from the measurement window 208a. The built-in CPU sends a reference position detection signal to the CPU 211 when the detected amount of reflected light is less than the reference amount. Here, the reference amount is the amount of reflected light on the band surface 91a excluding the reference position B1 when the test light is applied onto the measurement position MP1. Thus, the reference position detection sensor 208y detects the reference position B1 on the measurement position MP1 (S12 in FIG. 21).

  The CPU 211 rotates the inspection roller 201 via the motor 205 for a predetermined time t1 from the time when the reference position detection signal is received. By the rotation of the inspection roller 201, the band 91 is sent out in the longitudinal direction by a distance L corresponding to the time t1. For example, when the band 91 is sent out from the reference position B1 by the distance L (j), the thickness measurement line ST (j) is positioned on the reference position MP1 (S13 in FIG. 21).

  As shown in FIG. 19, the sensor unit 208 uses a distance measuring sensor 208x (see FIG. 16) to measure the distance from the band surface 91a to the measurement window 208a at each intersection P (see FIG. 15) on the reference position MP1. A is measured (S14 in FIG. 21). For example, when the thickness measurement line ST (j) is positioned on the reference position MP1 (see FIG. 15), the distance measuring sensor 208x (see FIG. 16) has an intersection P (i, j on the thickness measurement line ST (j). ) The distance A (i, j) [i = 1, 2, 3,... M] at [i = 1, 2, 3,.

  Further, the sensor unit 208 measures the distance B from the axial end 201be to the measurement window 208a at the reference position MP2 (see FIG. 15) using the distance measuring sensor 208x (see FIG. 16). When the thickness measurement line S (j) is located on the reference position MP1, the distance measuring sensor 208x (see FIG. 16) measures the distance B (j) from the axial end 201be to the measurement window 208a (FIG. 21). S15). Note that the number of measurement points for the distance B (j) may be one or more as long as it is a point set on the measurement position MP2. When one measurement point of the distance B (j) is set, the measurement value at the measurement point may be the distance B (j). When a plurality of measurement points for the distance B (j) are set, the average value of the measurement values at each measurement point may be set as the distance B (j).

  The measured values of the distance A and the distance B are respectively stored in the storage unit 212 (see FIG. 16) (S16 in FIG. 21).

  The CPU 211 determines whether or not measurement for all thickness measurement lines ST has been completed (S17 in FIG. 21). When it is determined that the measurement for all the thickness measurement lines ST has been completed, the process proceeds to the next process (S20 in FIG. 21). On the other hand, when it is determined that the measurement for all the thickness measurement lines ST is not completed, the step of moving the band 91 until the next thickness measurement line ST is on the reference position MP1 (S18 in FIG. 21); A series of steps (S14 to S16) for measuring the thickness measurement line ST are repeated.

The distance calculation unit 216 calculates the distance H (see FIG. 20) from the axial end 201be to the band surface 91a by using the equation (2) (S20 in FIG. 21). The calculated distance H is stored in the storage unit 212 (see FIG. 16). Expression (2) H (i, j) = B (j) −A (i, j)
[j = 1, 2, 3,... n] [i = 1, 2, 3,.

The floating amount calculation unit 217 reads the band thickness information 225 from the storage unit 212, and calculates the floating amount CL (i, j) (see FIG. 21) from the equation (1) (S21 in FIG. 21). The calculated floating amount CL is stored in the storage unit 212 (see FIG. 16).
Expression (1) CL (i, j) = H (i, j) −D (i, j)
[j = 1, 2, 3,... n] [i = 1, 2, 3,.

  The determination unit 218 determines whether or not all the floating amounts CL (i, j) of the band 91 are equal to or less than the threshold value TH1 (S22 in FIG. 21). When it is determined that all the floating amounts CL (i, j) are equal to or less than the threshold value TH1, the band 91 is determined as “accepted product” (S23 in FIG. 21). On the other hand, the band 91 determined to be out of the allowable range is determined as a “failed product” (S24 in FIG. 21).

  When the band 91 determined as “failed product” is used in the solution casting method, unevenness of thickness occurs in the casting film 136. In the present invention, the manufactured band 91 is inspected based on the floating amount CL under the same conditions as the film forming conditions. Therefore, the band 91 that induces uneven thickness of the cast film without performing the solution film forming method. It is possible to detect whether or not there is.

  As shown in FIGS. 11 and 12, a decompression chamber 237 for depressurizing the back side of the bead (the upstream side in the movement direction of the band 91) may be provided on the upstream side in the movement direction of the casting die 133. Here, the bead is formed from the outflow port 133 a to the band surface 91 a of the band 91 by the dope flowing out from the casting die 133. Due to the movement of the band 91, the decompression chamber 237 suppresses the vibration of the bead caused by the accompanying air flowing in the moving direction of the band 91 due to the movement of the band 91. Can be prevented. The vibration of the beads caused by the accompanying wind becomes a problem when the moving speed of the band 91 exceeds 30 m / min. Therefore, when the moving speed of the band 91 exceeds 30 m / min, it is preferable to provide the decompression chamber 237.

  The decompression chamber 237 is disposed upstream of the casting die 133 in the moving direction of the band 91 so as to be close to the band surface 91a in the normal direction of the band surface 91a. The distance between the decompression chamber 237 and the band surface 91a is, for example, 0.7 mm or less. A decompression fan (not shown) for sucking the gas in the decompression chamber 237 is connected to the decompression chamber 237 via a suction pipe.

  The decompression chamber 237 includes a box-shaped chamber body, a seal member for enhancing the sealing property in the chamber body, and a rectifying member for adjusting the gas flow in the decompression chamber 237 to a predetermined direction. . The chamber body is for enclosing the back side of the bead, and includes an upstream side wind shielding plate 237a, a pair of side wind shielding plates 237b, a top plate 237c, and a front plate. The upstream side wind shield 237a is in an upright position with respect to the band surface 91a on the upstream side in the moving direction of the band 91 with respect to the outlet 133a (see FIG. 11), and in the normal direction of the band surface 91a, the band surface 91a. It is provided so as to be close. The upstream wind shielding plate 237a extends from one side of the band 91 to the other side, and both end portions of the upstream wind shielding plate 237a face each other. Each of the pair of side wind shields 237b is extended from the both ends of the upstream wind shield 237a toward the downstream side in the moving direction of the band 91 in a posture standing with respect to the surface of the side portion. A top plate 237c and a front plate are spanned between the pair of side wind shielding plates 237b.

  The decompression chamber main body is surrounded by an upstream side wind shield 237a, a pair of side wind shields 237b, a top plate 237c, and a front plate, and has a suction port (not shown) that opens toward the band surface 91a. Have. With a decompression fan (not shown), the decompression chamber 237 sucks the gas upstream of the bead from the suction port. As a result of the suction of the gas on the upstream side of the bead, the pressure on the upstream side of the bead decreases, and a pressure difference ΔP between the upstream side and the downstream side of the bead can be generated. Due to this pressure difference ΔP, the vibration of the bead caused by the accompanying air flowing in the moving direction of the band 91 due to the movement of the band 91 and suppressing the vibration of the bead is suppressed. Can be prevented.

  As shown in FIGS. 11 and 13, a reduced pressure area BA is formed on the band surface 91 a of the band 91. The decompression area BA is a portion covered by the decompression chamber 237 on the band surface 91a supported by the film forming roller 131.

  In this case, in addition to the measurement of the floating amount CL for the measurement position MP1, using the band inspection apparatus 200 (see FIG. 14), the floating amount CL of the measurement position MA (see FIG. 15) corresponding to the reduced pressure area BA is measured. It is preferable to perform the measurement. More specifically, a measurement line ML extending in the width direction is set at the measurement position MA set on the band surface 91a, and the above-described band inspection process 230 (see FIG. 21) is performed for each measurement line ML. Is preferred. The measurement line ML is preferably set side by side from the upstream end in the movement direction of the band 91 at the measurement position MA to the downstream end in the movement direction of the band 91. As a result, the band 91 can be inspected over the entire measurement position MA.

The measurement position MA is set on the band surface 91a supported by the inspection roller 201. As shown in FIGS. 11 and 22, the angle φ _BAu formed by the surface L _BAu and the surface L _TP extending from the rotation center O _131a toward the upstream end BAu in the moving direction of the band 91 in the decompression area BA is the rotation center. from O _201a and the plane _{M mAU} and the surface _{M TP} extending toward the moving direction upstream end mAU band 91 of the measuring position MA is equal to the angle phi _mAU of angle. The angle φ _BAd formed by the surface L _BAd and the surface L _TP extending from the rotation center O _131a toward the downstream end BAd in the movement direction of the band 91 in the decompression area BA is a band at the measurement position MA from the rotation center O _201a. 91 is equal to an angle φ _MAd formed by a surface M _MAd extending toward the downstream end MAd in the moving direction and the surface M _TP .

  When the band 91 in which the floating amount CL at the measurement position MA exceeds the threshold value TH1 is used in the solution casting method, the movement of the band 91 causes variations in the sealing performance of the decompression unit. As a result of the vibration of the bead due to the variation in the sealing performance of the decompression unit, the thickness of the cast film is uneven at the final low. Therefore, the floating amount CL is measured at the measurement position MA (see FIG. 22) corresponding to the decompression area BA, and the band 91 is inspected over the entire measurement position MA, thereby performing the casting without performing the solution casting method. It is possible to detect whether or not the band induces uneven thickness of the film.

  Next, an example of a method for setting the thickness measurement line SM will be described. FIG. 23 shows distance data detected by the sensor device of the distance measuring sensor 208x for a band in which no warp occurs, that is, a band in which the floating amount CL is all “0”, and FIG. 24 shows a band in which a warp occurs. The distance data detected by the sensor device of the distance measuring sensor 208x is shown. The horizontal axis in FIGS. 23 and 24 represents the position in the width direction of the band 91, and the vertical axis in FIGS. 23 and 24 represents the distance detected by the sensor device.

  The sensor device of the distance measuring sensor 208x measures the distance from the measurement surface 208a to the band surface 91a or the axial end 208be from one end to the other end of the band 91 in the width direction. The built-in CPU of the distance measuring sensor 208x reads the distance data measured by the sensor device (hereinafter referred to as distance data) from one width direction outer side to the width direction center side to the other width direction outer side. Next, the built-in CPU determines that the rising edge E1 is the end of the axial end 201be and the peak E2 is the end of the band 91 in the distance data. Here, the rising edge E1 is the rising edge that is first detected by the built-in CPU that reads from one width direction outside to the other width direction outside, and the peak E2 is a position that indicates the maximum value of the distance data. .

  Next, the built-in CPU selects arbitrary distance data between the position of the rising E1 and the position away from the rising E1 by a predetermined amount toward the center in the width direction. Then, the distance B is calculated based on the selected distance data.

  Further, the built-in CPU selects arbitrary distance data between the position of the peak E2 and the position away from the peak E2 by a predetermined amount ε toward the center in the width direction. Thus, the built-in CPU calculates the distance A based on the selected distance data.

  Of the thickness measurement lines SM, the one positioned closest to the end in the width direction of the band 91, that is, the thickness measurement line SM (1) and the thickness measurement line SM (m) correspond to the peak E2 in FIGS. The position is preferably set at one end or the other end of the band 91. Thus, the built-in CPU can recognize the position of the peak E2 as the thickness measurement line SM (1) or the thickness measurement line SM (M). In addition, since the interval ε between adjacent thickness measurement lines SM is set in advance, the thickness measurement line SM (2) and the thickness measurement line SM (M−) are located at a predetermined distance from the peak E2 toward the center in the width direction. 1).

  By doing in this way, even if the edge part of the band 91 in the width direction warps, the error of the position of the thickness measurement line SM in the width direction can be minimized.

  In the above embodiment, the thickness measurement line SM is set based on one end or the other end of the band 91. However, the present invention is not limited to this, and a portion where warpage does not occur (for example, the center in the width direction of the band 91). Part)), the thickness measurement line SM may be set at a position away from the part by a predetermined distance. In the case of the band 91 having the welded portion 91w, the thickness measuring line SM may be set at a position away from the portion by a predetermined distance with reference to the position of the welded portion 91w. Note that the thickness measurement line SM may be set at a position away from the portion by a predetermined distance with reference to a separate mark set on the band surface 91a.

  The band inspection step 230 is applicable to both the band 91 having only the welded portion 91v and the band 91 having the welded portion 91v and the welded portion 91w.

  In the film forming apparatus 117 (see FIG. 10), the reaching position DP and the peeling position PP are set on the band surface 91a of the band 91 supported by the film forming roller 131. Not limited to. For example, instead of the film forming roller 131, a reaching support roller and a peeling support roller may be used. And, on the surface 91a of the band 91 spanned between the reaching support roller and the peeling support roller, the reaching position DP is set in the portion supported by the reaching support roller, and the portion supported by the peeling support roller Is set to the peeling position PP. Further, when the decompression chamber 237 is provided, the decompression area BA is set in a portion supported by the reaching support roller. You may perform the band test process 230 of this invention with respect to the position corresponding to such arrival position DP or pressure reduction area BA.

  The reference position B1 may not be the welded portion 91v. For example, a separate mark set on the band surface 91a may be used as the reference position B1.

  The film forming rollers 131 and 132 and the evaluation rollers 201 and 202 are preferably the same roller. Moreover, in the solution casting apparatus 110, the band inspection process 230 may be performed.

  The film 116 obtained by the solution casting apparatus 110 shown in FIG. 10 can be used for a retardation film or a polarizing plate protective film.

  The width of the film 116 is preferably 600 mm or greater and 3000 mm or less, and preferably 2000 mm or greater and 3000 mm or less. Further, the present invention can be applied even when the width of the film 116 exceeds 3000 mm. The film 116 preferably has a thickness of 30 μm or more and 120 μm or less.

(polymer)
The polymer that can be used in the present invention is not particularly limited as long as it is a thermoplastic resin, and examples thereof include cellulose acylate, a lactone ring-containing polymer, a cyclic olefin, and polycarbonate. Of these, cellulose acylate and cyclic olefin are preferable, and cellulose acylate containing an acetate group and propionate group and a cyclic olefin obtained by addition polymerization are particularly preferable.

(Cellulose acylate)
As a cellulose acylate, it is preferable that the substitution degree of the acyl group to the hydroxyl group of a cellulose satisfy | fills following formula (I)-(III). In the following formulas (I) to (III), A and B represent the substitution degree of the acyl group with respect to the hydrogen atom in the hydroxyl group of cellulose, A is the substitution degree of the acetyl group, and B is 3 to 22 carbon atoms. This is the substitution degree of the acyl group. It is preferable that 90% by mass or more of the cellulose acylate is 0.1 to 4 mm particles. Among these, the present invention is particularly effective when cellulose diacetate (DAC) is used as the cellulose acylate.
(I) 2.0 ≦ A + B ≦ 3.0
(II) 0 ≦ A ≦ 3.0
(III) 0 ≦ B ≦ 2.9

  Glucose units having β-1,4 bonds constituting cellulose have free hydroxyl groups at the 2nd, 3rd and 6th positions. Cellulose acylate is a polymer obtained by esterifying some or all of these hydroxyl groups with an acyl group having 2 or more carbon atoms. The degree of acyl substitution means the ratio at which the hydroxyl group of cellulose is esterified at each of the 2-position, 3-position and 6-position (the substitution degree is 1 in the case of 100% esterification).

  The total degree of acylation substitution, that is, the value of DS2 + DS3 + DS6 is preferably 2.00 to 3.00, more preferably 2.22 to 2.90, and particularly preferably 2.40 to 2.88. Further, the value of DS6 / (DS2 + DS3 + DS6) is preferably 0.28, more preferably 0.30 or more, and particularly preferably 0.31 to 0.34. Here, DS2 is a ratio in which the hydrogen of the hydroxyl group at the 2-position in the glucose unit is substituted by an acyl group (hereinafter referred to as “acyl substitution degree at the 2-position”), and DS3 is the hydroxyl group at the 3-position in the glucose unit. The hydrogen is substituted with an acyl group (hereinafter referred to as “acyl substitution degree at the 3-position”), and DS6 is the ratio of the hydrogen at the 6-position hydroxyl group substituted with an acyl group (hereinafter referred to as “acyl substitution degree at the 3-position”). "The 6-position acyl substitution degree").

  Only one type of acyl group may be used in the cellulose acylate of the present invention, or two or more types of acyl groups may be used. When two or more kinds of acyl groups are used, it is preferable that one of them is an acetyl group. The sum of the degree of substitution of hydroxyl groups at the 2nd, 3rd and 6th positions by acetyl groups is DSA, and the sum of the degree of substitution of the hydroxyl groups at the 2nd, 3rd and 6th positions by acyl groups other than acetyl groups When DSB is DSB, the value of DSA + DSB is preferably 2.22 to 2.90, and particularly preferably 2.40 to 2.88.

  The DSB is preferably 0.30 or more, particularly preferably 0.7 or more. Further, 20% or more of DSB is preferably a substituent of a hydroxyl group at the 6-position, more preferably 25% or more, further preferably 30% or more, and particularly preferably 33% or more. Further, the DSA + DSB value at the 6-position of the cellulose acylate is 0.75 or more, more preferably 0.80 or more, and particularly preferably cellulose acylate of 0.85 or more. By using it, a dope with better solubility can be produced. In particular, when a non-chlorine organic solvent is used, a dope having excellent solubility, low viscosity and excellent filterability can be produced.

  Cellulose, which is a raw material for cellulose acylate, may be obtained from either linter or pulp.

  The acyl group having 2 or more carbon atoms of cellulose acylate in the present invention may be an aliphatic group or an aryl group, and is not particularly limited. For example, cellulose alkylcarbonyl ester, alkenylcarbonyl ester, aromatic carbonyl ester, aromatic alkylcarbonyl ester and the like may be mentioned, and each may further have a substituted group. Preferred examples of these include propionyl 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, olenoyl group, benzoyl group, naphthylcarbonyl group, cinnamoyl group and the like. Among these, a propionyl group, a butanoyl group, a dodecanoyl group, an octadecanoyl group, a t-butanoyl group, an oleoyl group, a benzoyl group, a naphthylcarbonyl group, a cinnamoyl group, and the like are more preferable, and a propionyl group and a butanoyl group are particularly preferable. It is.

(solvent)
Solvents for preparing the dope include aromatic hydrocarbons (eg, benzene, toluene, etc.), halogenated hydrocarbons (eg, dichloromethane, chlorobenzene, etc.), alcohols (eg, methanol, ethanol, n-propanol, n-butanol, Diethylene glycol, etc.), ketones (eg, acetone, methyl ethyl ketone, etc.), esters (eg, methyl acetate, ethyl acetate, propyl acetate, etc.) and ethers (eg, tetrahydrofuran, methyl cellosolve, etc.).

  Among the above halogenated hydrocarbons, halogenated hydrocarbons having 1 to 7 carbon atoms are preferably used, and dichloromethane is most preferably used. From the viewpoint of physical properties such as solubility of cellulose acylate, peelability from cast film support, mechanical strength and optical properties of the film, one or several kinds of alcohols having 1 to 5 carbon atoms in addition to dichloromethane It is preferable to mix. As for content of alcohol, 2-25 mass% is preferable with respect to the whole solvent, More preferably, it is 5-20 mass%. Examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, and n-butanol, but methanol, ethanol, n-butanol, or a mixture thereof is preferably used.

  Recently, a solvent composition not using dichloromethane has been studied for the purpose of minimizing the influence on the environment. In this case, ethers having 4 to 12 carbon atoms, ketones having 3 to 12 carbon atoms, esters having 3 to 12 carbon atoms, and alcohols having 1 to 12 carbon atoms are preferable, and these are appropriately mixed. Sometimes it is used. For example, a mixed solvent of methyl acetate, acetone, ethanol, and n-butanol can be mentioned. These ethers, ketones, esters and alcohols may have a cyclic structure. A compound having two or more functional groups of ether, ketone, ester, and alcohol (that is, —O—, —CO—, —COO—, and —OH) can also be used as the solvent.

  In order to confirm the effect of the present invention below, Experiments 1 to 6 were performed. Details of each experiment will be described in Experiment 1. For Experiments 2 to 6, only conditions different from Experiment 1 are shown.

(Experiment 1)
In the band manufacturing facility 10 shown in FIG. 1, a band (A-1) was manufactured from a side member 11 (width 150 mm) made of SUS316 and a central member 12 (width 2000 mm) made of SUS316.

For the band (A-1), the band inspection process 230 shown in FIG. 21 was performed using the band inspection apparatus 200 shown in FIG. In the band inspection process 230, the floating amount CL at the measurement position MP1 and the floating amount CL at the measurement position MA were measured. Maximum _{CL MA} floating amount CL at the maximum value _{CL MP,} and measurement position MA floating amount CL at the measurement position MP1 is shown in Table 1. During the band inspection process 230, the moving tension T2 applied to the band to be inspected was 60 N / mm ² .

  In a solution casting apparatus 110 (see FIG. 10), a film 116 was produced from a dope 113 containing cellulose diacetate (DAC) and a solvent. Band A was used as band 91. The moving speed of the band 91 was 40 m / min. The casting die 133 continuously flowed out the dope 113 to the band 91 in the moving state. On the surface 91 a of the band 91, a casting film 136 made of the dope 113 was formed.

  The solvent was evaporated from the cast film 136 on the band 91 using the dry air from each of the ducts 141 to 143. A peeling roller 135 peeled off the casting film 136 from the band 91 to obtain a film 116. The film 116 was sequentially sent to the first tenter 120, the roller drying device 124, the second tenter 125, and the slitter 126.

(Experiments 2-6)
A film 116 was produced in the same manner as in Experiment 1 except that the bands (A-2) to (A-6) obtained by the band production facility 10 were used instead of the band (A-1). However, the maximum value CL _{MP of} the floating amount CL and the maximum value CL _MA of the floating amount CL are as shown in Table 1.

  The films obtained in Experiment 1 to Experiment 6 were evaluated as follows.

1. Evaluation of peeling residue The band was examined for the presence or absence of peeling of the cast film.
○: No peeling of the cast film occurred in the band.
X: The casting film was not peeled off in the band.

2. Evaluation of presence or absence of thickness unevenness The presence or absence of thickness unevenness of the cast film was evaluated by the following procedure. A sample film was cut out from the film before being wound around the winding core at the winding portion 127. When light was transmitted through the sample film, the shadow appearing on the surface of the sample film was visually observed. If the intensity of the shadow observed on the sample film is larger than that of the product film that passed the evaluation test of thickness unevenness as a retardation film or polarizing plate protective film, the thickness unevenness cannot be tolerated (×) It was judged. In addition, if the scale of the shadow observed on the sample film is the same as or smaller than that of a product film that has passed the performance test as a retardation film or a polarizing plate protective film, the thickness unevenness is acceptable. It was judged that it was possible (○).

  The evaluation results of Experiments 1 to 6 are shown in Table 1. In Table 1, the numbers assigned to the evaluation results represent the numbers assigned to the evaluation items.

91 Band 200 Band inspection device 201, 202 Inspection roller 203 Shift unit 205 Motor 206 Drive unit 207 Load cell 208 Sensor unit 208x Distance sensor 208y Reference position detection sensor 211 CPU
212 storage unit 216 distance calculation unit 217 floating amount calculation unit 218 determination unit 230 band inspection step 237 decompression chamber

Claims (10)

A reaching position where the dope flowing down from the casting die reaches is set, and includes a front surface for forming a casting film made of the reached dope, and a back surface for being supported by the film-forming roller when circulating. In the inspection method of the endless band made of metal,
A distance for calculating a distance H from the measurement position on the front surface corresponding to the arrival position to the support surface of the inspection roller in the endless band in a state where the back surface is supported by the inspection roller and a moving tension is applied. H calculation step;
A floating amount calculation step of calculating a floating amount CL from the support surface to the back surface at the measurement position according to the equation (1),
And a determination step of determining whether or not the calculated floating amount CL is equal to or less than a threshold value.
Formula (1) CL = HD
D: thickness of the endless band at the measurement position The inspection roller supports the endless band at the axial center so that the axial end is exposed,
In the distance calculating step, distance measurement means is used to measure a distance A from the measurement position to the distance measurement means and a distance B from the end in the axial direction to the distance measurement means at the measurement position. 2. The endless band inspection method according to claim 1, wherein the distance H is calculated according to 2).
Formula (2) H = BA In the float amount calculating step, the position information from the reference position set to the endless band to the measurement position and the thickness D of the endless band at the measurement position are stored in association with each other from the storage means. Read thickness D,
3. The method for inspecting an endless band according to claim 1 or 2, wherein the floating amount CL is calculated using a thickness D of the endless band read from the storage means.   The said endless band consists of a metal 1st web and the metal 2nd web welded to the width direction one side of this 1st web, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Endless band inspection method.   The endless band inspection method according to any one of claims 1 to 4, wherein the film-forming roller and the inspection roller are the same roller. The moving tension is 60 N / mm ² ;
6. The endless band inspection method according to claim 1, wherein the threshold value is 0.1 mm or less. A reaching position where the dope flowing down from the casting die reaches is set, and includes a front surface for forming a casting film made of the reached dope, and a back surface for being supported by the film-forming roller when circulating. In a metal endless band inspection device,
A distance for calculating a distance H from the measurement position on the front surface corresponding to the arrival position to the support surface of the inspection roller in the endless band in a state where the back surface is supported by the inspection roller and a moving tension is applied. A calculation means;
A floating amount calculating means for calculating a floating amount CL from the support surface to the back surface at the measurement position according to the equation (1);
An endless band inspection apparatus comprising: determination means for determining whether or not the calculated floating amount CL is equal to or less than a threshold value.
Formula (1) CL = HD
D: thickness of the endless band at the measurement position The inspection roller supports the endless band at the axial center so that the axial end is exposed,
Distance measuring means for measuring the distance A to the measurement position and the distance B to the axial end at the measurement position is provided,
The endless band inspection apparatus according to claim 7, wherein the distance calculation unit calculates the distance H according to Equation (2).
Formula (2) H = BA Storage means for storing position information from a reference position set to the endless band to the measurement position and a thickness D of the endless band at the measurement position in association with each other;
9. The endless band inspection apparatus according to claim 7, wherein the floating amount calculating means calculates the floating amount CL by using the thickness D of the endless band stored in the storage means.   10. The endless band inspection apparatus according to claim 7, wherein the film-forming roller and the inspection roller are the same roller.

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