TW201404482A - Method for removing foreign matter of web and apparatus for removing foreign matter of web - Google Patents

Abstract

An apparatus for removing a foreign matter of a web is provided, which includes: a backup roller around which a traveling web is wrapped and which supports the traveling web and which driven-rotates by a conveyance of the web; a cleaning roller which transfers the foreign matter attached to the surface of the web to the peripheral surface of the cleaning roller by nipping the web between the backup roller and the cleaning roller and which driven-rotates by a conveyance of the web; an adhesion roller which transfers the foreign matter transferred on the cleaning roller to the peripheral surface of the adhesion roller having an adhesion layer by pressing the adhesion roller to the cleaning roller to remove the foreign matter and which driven-rotates by rotation of the cleaning roller; a roller-center circumferential velocity measuring unit for measuring a rotation circumferential velocity (V1) at a roller-center of the cleaning roller; a roller-edge circumferential velocity measuring unit for measuring a rotation circumferential velocity (V2) at a roller-edge of the backup roller; and a circumferential velocity difference ratio adjusting unit for adjusting a circumferential velocity difference ratio which is indicated by [(V2-V1)/V1] x 100 base on the measured value at roller center and roller edge.

Description

Foreign matter removing method for thin slat strip and foreign matter removing device

The present invention relates to a method for removing foreign matter of a thin strip and a foreign matter removing device, and more particularly to a method for removing a web attached to a base film, an intermediate product film, a product film or the like in each process of manufacturing an optical film. A method for removing foreign matter of a thin strip of foreign matter such as dust and a foreign matter removing device.

For example, the optical compensation film is a thin film strip (base film) made of a transparent resin, and is subjected to a saponification process, an alignment film forming process (intermediate film), and an optical anisotropic layer forming process (product film). Manufacturing.

However, when the thin strip is conveyed in each process, foreign matter such as dust or dust suspended in the process may adhere to the surface of the thin strip by the force of static electricity or the like. When coating is performed in a state where foreign matter adheres to the surface of the thin strip, coating unevenness may occur or uneven alignment may occur. Further, an optical compensation film produced by using an alignment film having an uneven alignment is liable to cause optical dot defects.

In an optical film such as an optical compensation film, adhesion to a surface of a thin strip Things become the main cause of various defects, so it is important to remove them.

As a method of removing foreign matter on the surface of the thin strip, a method of cleaning the surface of the thin strip by a cleaning liquid such as water is known, but the selection of the cleaning liquid, the physical property change of the surface of the thin strip caused by the cleaning liquid, and the apparatus are known. Disadvantages such as large-scale processing and cleaning of waste liquid.

As another method, there is a method in which air is blown to the surface of the thin strip to remove foreign matter, but there is a disadvantage that the effect of removing foreign matter such as micron-order fine dust which is a problem on the optical film is small.

Due to such a background, the foreign matter removing device of the rubber roller type is widely used in the industry, and the foreign matter removing device holds the adhesive rubber roller by the surface of the thin strip to transfer the foreign matter on the surface of the thin strip to The rubber roll side is removed, and the thin strip is wound and supported on a back up roller and transported (for example, Patent Document 1).

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-288483

However, the foreign matter removing device of the adhesive rubber roller method has a problem that the removal efficiency of the foreign matter is deteriorated depending on the rigidity of the roller, the thickness of the web tension of the conveyed thin strip, the magnitude of the clamping pressure, and the like. . In addition, there is the following problem: on the back side of the thin strip (the surface without the optical layer) The strip travels in the direction of the strip to produce streaky scratches or dust.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a foreign matter removing method for a thin slat strip and a foreign matter removing device which removes a foreign matter of a thin slat strip by an adhesive rubber roller, and the removal efficiency of the foreign matter is good, and can be effectively suppressed. Stripe-like scratches or dust are generated on the back side of the slats along the direction in which the slats travel.

In order to achieve the object, the thin strip of one embodiment of the present invention is different The object removing method is a foreign matter removing method of removing foreign matter adhering to the surface of the thin strip by using a supporting roller and a cleaning roller, and the supporting roller winds and supports the conveyed thin strip by The thin strip is driven to rotate, the cleaning roller includes a roller circumferential surface having an adhesive rubber, and the foreign matter removing method of the thin strip includes the following steps: a transfer removing step, the support roller and the The thin strips are sandwiched between the cleaning rollers, thereby transferring foreign matter adhering to the surface of the thin strip to the cleaning roller; a peripheral speed measuring step of measuring a rotation circumference of a central portion of the roller of the cleaning roller a speed V1 (m/min) and a rotational peripheral speed V2 (m/min) of the roller end portion of the support roller; and a peripheral speed difference rate adjusting step of adjusting the peripheral speed difference rate so that [(V2- The peripheral speed difference ratio represented by V1)/V1]×100 satisfies 0.5% or less.

Furthermore, in the present invention, the rotational peripheral speed of both ends of the roller supporting the roller is The description will be made in the same manner. However, in the case where the rotation peripheral speed is different, the rotation peripheral speed of the roller end portion having a large rotation peripheral speed is V2. The same is true below.

About foreign matter removal efficiency when removing thin strips of foreign matter by means of adhesive rubber roller The inventors obtained the following findings by dropping, causing scratches on the back side of the thin strip, and causing dust.

That is, depending on the degree of rigidity of the support roller and the cleaning roller, the magnitude of the tension of the thin strip wound and supported on the support roller, and the holding force of the support strip and the cleaning roller for holding the thin strip, the support roller or the cleaning When the roller is deflected, the circumferential speed difference occurs at the center portion of the roller and the end portion of the roller as the cleaning roller of the rubber roller. By the difference in the peripheral speed of the cleaning roller, the peripheral speed of the backup roller is increased, and the conveying speed of the thin slats is deviated, which causes deterioration of the removal efficiency of foreign matter, generation of streaky scratches, and generation of dust.

Furthermore, about rotating the peripheral speed by the center of the roller and the end of the roller at the cleaning roller A mechanism for generating a circumferential speed difference to cause a deviation between the peripheral speed of the support roller and the conveying speed of the thin slats will be described later.

In addition, when the rotational peripheral speed of the center portion of the roller of the cleaning roller is V1 (m/min) and the rotational peripheral speed of the roller end portion of the backup roller is V2 (m/min), [(V2-) The peripheral speed difference ratio represented by V1)/V1]×100 satisfies 0.5% or less, whereby the removal efficiency of foreign matter can be improved, and streaky scratches and dust generation can be suppressed.

The foreign matter removing method of the thin slat of the present invention is completed based on the above-described knowledge. When the rotational peripheral speed of the central portion of the roller of the cleaning roller is set to V1 (m/min), the rotational peripheral speed of the roller end portion of the supporting roller is set. When V2 (m/min) is set, the circumferential speed difference ratio represented by [(V2-V1)/V1]×100 is made 0.5% or less. Thereby, the removal efficiency of foreign matter can be improved, and streaky scratches and dust generation can be suppressed.

In addition, the reason why the circumferential speed difference V2 of the roller end portion of the support roller is obtained as a problem in the circumferential speed difference between the center portion of the roller of the cleaning roller and the roller end portion will be described later.

The method for removing foreign matter of the thin strip preferably further comprises the following steps: The adhesive roller is pressed to the cleaning roller to transfer the foreign matter transferred to the cleaning roller to the adhesive roller, and the adhesive roller includes a roller circumferential surface having an adhesive layer.

In order to achieve the object, the foreign matter removal of another embodiment of the present invention The device includes: a support roller made of metal or resin, wound and supported by the conveyed thin strip, and driven to rotate by the conveyance of the thin strip; the cleaning roller and the support roller sandwich the thin strip to be attached The foreign matter on the surface of the thin strip is transferred to the circumferential surface of the roller having the adhesive rubber, and is removed by the conveyance of the thin strip; the central peripheral speed measuring unit measures the rotation circumference of the central portion of the roller of the cleaning roller. The speed V1; the end peripheral speed measuring unit measures the rotational peripheral speed V2 of the roller end portion of the support roller; and the peripheral speed difference adjusting unit adjusts the [[V2] according to the measured value of the center portion of the roller and the end portion of the roller. -V1) / V1] × 100 indicates the peripheral speed difference.

a foreign matter removing device according to the thin strip, comprising: a central peripheral speed test The fixed unit measures the rotational peripheral speed V1 of the center portion of the roller of the cleaning roller; the end peripheral speed measuring unit measures the rotational peripheral speed V2 of the roller end portion of the support roller; and the peripheral speed difference adjusting unit according to the center portion of the roller and the roller The measured value of the end portion is adjusted to the peripheral speed difference ratio expressed by [(V2 - V1) / V1] × 100; therefore, the removal efficiency of foreign matter can be improved, and streaky scratches and dust generation can be effectively suppressed.

In the present invention, it is preferred to include an adhesive roller which is pressed To the cleaning roller, the foreign matter transferred to the cleaning roller is transferred to the peripheral surface of the roller having the adhesive layer to be removed. Further, it is preferable that the support roller and the cleaning roller use a roller having a deflection amount in the axial direction of 50 μm or less.

The method for measuring the amount of deflection of each roller is not particularly limited, but may be preferably A method of arranging a laser displacement meter at each of the center portion of the roller and both ends of the roller is used.

Thus, by using at least the support roller and the cleaning roller, the rigidity is large. The roller, that is, the roller having low flexibility, can reduce the circumferential speed difference between the center portion of the roller of the support roller and the end portion of the roller.

Further, in the present invention, the peripheral speed difference adjustment unit preferably has a wrap angle adjustment At least one of an integral unit and a clamping pressure adjusting unit that adjusts a package angle of the thin strip wound on the support roller, the clamping pressure adjusting unit adjusting the clamping of the thin strip to the supporting roller and The clamping pressure between the cleaning rollers.

The reason is that the winding is supported by the use of the wrap angle adjustment unit. The wrap angle of the thin strip on the roll can reduce the peripheral speed difference between the center portion of the roll of the cleaning roller and the end portion of the roll. It is preferable to set the package angle to 20 or less.

And, the reason is that it is adjusted by using the clamping pressure adjusting unit The nip pressure between the support roller and the cleaning roller can reduce the circumferential speed difference between the center portion of the roller of the cleaning roller and the end portion of the roller. It is preferable to adjust the nip pressure to 0.5 N/cm or more and 1.0 N/cm or less. By adjusting the nip pressure to 0.5 N/cm or more and 1.0 N/cm or less as described above, the circumferential speed difference between the center portion of the roll of the backup roll and the end portion of the roll is further reduced, thereby improving the foreign matter removal performance. It can prevent scratches on the back of the thin strip more effectively.

Further, in the invention, it is preferable that the roller main body portion of the cleaning roller is rubber Made, and the rubber hardness is 20 ° ~ 60 °.

Further, in the invention, it is preferable that the thin strip is any one of a base film, an intermediate product film, and a product film when the optical film is produced. The reason for this is that in the case of an optical film, fine foreign matter adhering to the surface of the thin strip causes defects in optical characteristics, and scratches or dust generation at the time of removal of foreign matter also cause a decrease in optical characteristics.

According to the foreign matter removing method and the foreign matter removing device of the thin strip of the present invention, when the thin strip of foreign matter is removed by the adhesive rubber roller, the removal efficiency of the foreign matter is good, and the streaking of the thin strip in the traveling direction of the thin strip can be effectively suppressed. Scratches or produces dust.

10‧‧‧ Foreign object removal device

12‧‧‧Support roll

14‧‧‧cleaning roller

16‧‧‧Adhesive roller

18‧‧‧1st mobile platform

20‧‧‧Roll support table

22‧‧‧ Bearing

24‧‧‧Base

26‧‧‧1 track

28‧‧‧Linear guides

30‧‧‧1st cylinder device

30A‧‧‧Piston rod

32‧‧‧2nd mobile platform

34‧‧‧Roll support table

36‧‧‧ Bearing

38‧‧‧2nd track

40‧‧‧Linear guides

42‧‧‧2nd cylinder device

42A‧‧‧Piston rod

44‧‧‧3rd mobile platform

46‧‧‧Roll support table

48‧‧‧ bearing

50‧‧‧3rd track

52‧‧‧Linear guides

54‧‧‧3rd cylinder device

54A‧‧‧Piston rod

56A‧‧‧Central Speed Measurement Unit

56B‧‧‧End peripheral speed measuring unit

58‧‧‧Week speed difference adjustment unit

58A‧‧‧Wrap angle adjustment unit

58B‧‧‧Clamping pressure adjustment unit

60‧‧‧ Controller

61‧‧‧guide roller

62‧‧‧Joint roller

63‧‧‧Cylinder unit

64‧‧‧ rod

P‧‧‧Scratch

W‧‧‧thin slats

Contact points that began to contact X‧‧‧

Y‧‧‧Contacts at the end of contact

Fig. 1 is a side view showing an embodiment of a foreign matter removing device of the present invention.

Fig. 2 is a plan view showing an embodiment of the foreign matter removing device of the present invention.

Fig. 3 is an explanatory diagram of a wrap angle.

Fig. 4 is an explanatory view of a scratch generated on the back surface of the thin strip.

Fig. 5 is an explanatory view for explaining a mechanism of generating a circumferential speed difference of the cleaning roller.

Fig. 6 is an explanatory view for explaining a state of a central portion of a roller in the mechanism of Fig. 5;

Fig. 7 is an explanatory view for explaining a state of a roller end portion in the mechanism of Fig. 5;

Fig. 8 is an explanatory view for explaining the relationship between the package angle of the thin strip and the tension of the web and the amount of deflection of the roll of the backup roll.

Fig. 9 is an explanatory view for explaining the relationship between the nip pressure and the rotational peripheral speed of the backup roller.

Hereinafter, a preferred embodiment of the foreign matter removing method and the foreign matter removing device of the thin strip of the present invention will be described in detail with reference to the accompanying drawings.

Here, the parts denoted by the same symbols in the drawings are the same elements having the same function. Further, in the present specification, when "~" is used to indicate a numerical range, the numerical value of the upper limit indicated by "~" and the numerical value of the lower limit are also included in the numerical range.

[Composition of foreign matter removal device]

Fig. 1 is a side view of the foreign matter removing device 10 of the thin strip of the embodiment of the present invention viewed from the side, and Fig. 2 is a plan view as seen from the upper surface. Further, the foreign matter removing device 10 of the thin strip of the embodiment of the present invention is not limited to the use, but is particularly suitable for removing the thin strips attached to the base film, the intermediate product film, the product film, and the like in the respective processes for manufacturing the optical film. A device for foreign matter such as dust.

As shown in FIGS. 1 and 2, the support roller 12, the cleaning roller 14, and the adhesive roller 16 are arranged in parallel by setting the axial height positions of the rollers to be the same.

The support roller 12 is rotatably supported by a pair of bearings 22 and 22 which are opposed to each other and disposed on the roller support table 20, and the roller support table 20 is fixed to the first moving platform 18. The first moving platform 18 is slidably supported by a pair of parallel first rails 26 and 26 by linear guides 28 and 28, and the pair of first rails 26 and 26 are laid on the base 24 . Further, the base 24 is provided with a pair of first cylinder devices 30 and 30 for moving the first moving platform 18 on the first rail 26, and the front ends of the piston rods 30A and 30A are provided. It is fixed to the first mobile platform 18.

The support roller 12 is formed as a roller in which a metal main body or a resin roller main body portion is provided on a roll core made of metal. When the roller main body portion is made of metal, it is preferable to carry out a hardening treatment such as nickel-chromium alloy plating on the surface of the roller. Further, when the roller main body portion is made of a resin, it is preferable to use a hard resin. Further, the support roller 12 is not limited to a metal or resin, and a roller whose main body portion is made of a hard material can be used.

The cleaning roller 14 is rotatably supported on a pair of bearings 36, 36, The pair of bearings 36 and 36 are disposed opposite to each other on the roller support table 34, and the roller support table 34 is fixed to the second moving platform 32. The second moving platform 32 is slidably supported by the pair of parallel second rails 38 and 38 by the linear guides 40 and 40, and the pair of second rails 38 and 38 are laid on the susceptor 24. Further, the base 24 is provided with a pair of second cylinder devices 42 and 42 for moving the second moving platform 32 on the second rail 38, and the distal ends of the respective piston rods 42A and 42A are fixed to the second moving platform 32. Further, the second cylinder devices 42 and 42 are disposed to face the first cylinder devices 30 and 30.

The cleaning roller 14 is formed as a rubber roller which will have an adhesive rubber roller The body portion is disposed on a roll core formed of metal. The adhesive force as the surface of the roller of the cleaning roller 14 is preferably in the range of 1 (hPa) to 60 (hPa). Further, the rubber hardness of the roller main body portion is preferably in the range of 20 to 60.

The method for measuring the rubber hardness of the cleaning roller 14 is based on a spring. The method of the type A (JIS K 6301A, JIS is a Japanese industrial standard (abbreviation of Japan Industrial Standards)) is the same as the measurement value by the rubber Durometer A.

Further, the method of measuring the adhesion of the surface of the roller of the cleaning roller 14 is based on JIS. K 6256.

The adhesive roller 16 is rotatably supported on a pair of bearings 48, 48, The pair of bearings 48, 48 are disposed opposite to the roller support table 46, and the roller support table 46 is fixed to the third moving platform 44. The third moving platform 44 is slidably supported by the pair of parallel third rails 50, 50 by the linear guides 52, 52, and the pair of third rails 50, 50 are laid on the second moving platform 32. Further, on the second moving platform 32, a pair of third cylinder devices 54 and 54 that move the third moving platform 44 on the third rail 50 are provided, and the ends of the respective piston rods 54A and 54A are fixed to the third moving platform. 44. Further, the third cylinder devices 54 and 54 are arranged in the same direction as the second cylinder devices 42 and 42.

The adhesive roller 16 is formed as a roller having an adhesive layer on a metal roll core. The adhesive layer has an adhesiveness greater than that of the rubber roller body portion of the cleaning roller. The adhesive layer may be formed of rubber having a higher adhesion than the cleaning roller, or may be an adhesive tape roller having an adhesive tape wound around a metal roll core. The adhesive force of the adhesive layer is preferably in the range of 50 (hPa) to 400 (hPa) in the measurement method of JIS K 6256.

The roll faces of the support roller 12, the cleaning roller 14, and the adhesive roller 16 are formed longer than The width of the thin strip W. For example, the roll face length is preferably about 100 mm to 200 mm longer than the width of the thin strip W. Further, it is preferable that at least the support roller 12, the cleaning roller 14, and the adhesive roller 16 use a low deflection roller having a deflection amount in the axial direction of 100 μm or less, preferably using a core direction. The amount of deflection is Low deflection rolls below 50 μm.

The low deflection roller is not particularly limited as long as the amount of deflection is 100 μm or less. For example, a "double tube low deflection roller" or a "carbon roll" manufactured by Mitsubishi Plastics Co., Ltd. can be used. When "double tube low deflection rolls" and "carbonaceous rolls" are used, it is preferred to use "carbonaceous rolls" for the support rolls 12 and "double tube low deflection rolls" for the cleaning rolls 14.

Further, in the foreign matter removing device 10, a central portion peripheral speed measurement is provided. The unit 56A measures the rotational peripheral speed V1 of the center portion of the roller of the cleaning roller 14, the end peripheral speed measuring unit 56B, measures the rotational peripheral speed V2 of the roller end portion of the backup roller 12, and the peripheral speed difference adjusting unit 58 (58A, 58B), the peripheral speed difference ratio represented by [(V2-V1)/V1]×100 is adjusted according to the measured values of the center portion of the roll and the end portion of the roll.

Here, the present invention sets the circumferential speed difference between the center portion of the roller of the cleaning roller 14 and the end portion of the roller. The reason for measuring the rotational peripheral speed V2 of the roller end portion of the support roller 12 is explained as a problem.

That is, when the cleaning roller 14 is deflected, two of the rubber cleaning rollers 14 are formed. Since the end portion is strongly pressed to both end portions of the backup roller 12 and deformed, it is impossible to measure an accurate rotational peripheral speed. Further, the reason for this is that the rotational peripheral speed of both ends of the roller of the backup roller 12 can be regarded as the rotational peripheral speed V2 of both ends of the roller of the cleaning roller 14.

Therefore, as shown in FIG. 2, the rotational peripheral speed V1 of the central portion of the roller is at the cleaning roller. In the center portion of the support roller 12, the center peripheral speed measuring unit 56A is provided for measurement. On the other hand, the end peripheral speed measuring unit 56B is provided at both end portions of the support roller 12 for the measurement of the rotational peripheral speed V2 of the roller end portion. .

The rotational peripheral speed of the roller end portion of the backup roller 12 can be regarded as the rotational peripheral speed V2 of both ends of the roller of the cleaning roller 14, and the following mechanism can be referred to.

The central portion peripheral speed measuring unit 56A and the end peripheral speed measuring unit 56B are preferably It is the use of a non-contact measuring unit. As the non-contact measuring unit, for example, a unit that measures the peripheral speed of the roll by a laser Doppler velocimeter can be preferably used. In FIG. 2, the end peripheral speed measuring means 56B are respectively provided at both end portions of the support roller 12, but the end peripheral speed measuring means 56B may be provided only on one end side of the support roller 12. The rotation peripheral speeds of the both ends of the roller of the support roller 12 are set to be the same. However, when the rotation peripheral speeds are different, the end peripheral speed measuring units 56B are respectively disposed on the support roller 12 At the end, the rotational peripheral speed of the end portion of the roller having a large rotating peripheral speed is set to V2.

The central portion peripheral speed measuring unit 56A and the end peripheral speed measuring unit 56B The measured rotational peripheral speed V1 and the rotational peripheral speed V2 are transmitted to the controller 60 via a signal cable.

Further, as the peripheral speed difference adjustment unit 58, a wrap angle (wrap The adjustment unit 58A and the nip pressure adjustment unit 58B.

The wrap angle adjusting unit 58A adjusts the thin plate wound and supported on the support roller 12 The wrap angle (winding angle) of the strip W may be provided in any one of the inlet side and the outlet side of the support roller 12 in the sheet conveying direction, but is more preferably the outlet side.

As shown in FIG. 3, the wrap angle (θ) means that the thin strip W and the support roller 12 are opened. The central angle formed by the contact X at the beginning of contact and the contact Y at the end of contact.

The wrap angle adjusting unit 58A is as shown in FIG. 1 at the support roller 12 and the guide roller 61. An engagement roller 62 joined to the thin strip W is provided on the thin slat transfer line. The thin strip W is placed in an S shape and is carried between the support roller 12, the joining roller 62, and the guide roller 61. Both ends of the rotating shaft of the joining roller 62 are rotatably supported by the rods 64 and 64 of the pair of cylinder devices 63 and 63, and the pair of cylinder devices 63 and 63 are disposed along the width direction of the thin strip W. Thereby, the rods 64 and 64 are expanded and contracted by the cylinder devices 63 and 63, and the wrap angle (θ) of the thin strip W can be changed.

The clamping pressure adjusting unit 58B is adjusted between the support roller 12 and the cleaning roller 14 The nip pressure of the thin strip W is sandwiched between the second cylinder device 42 and the controller 60 by a signal cable. That is, the amount of elongation of the piston rod in the second cylinder device 42 is controlled by an instruction from the controller 60, thereby adjusting the nip pressure. Further, the first cylinder device 30 performs attachment and detachment of the backup roller 12. The third cylinder device 54 adjusts the nip pressure between the cleaning roller 14 and the adhesive roller 16. The control of the first cylinder device 30 and the third cylinder device 54 may be performed by the controller 60, or another controller may be provided.

Next, the removal of the attachment using the foreign matter removing device 10 constructed as described above will be described. A method of removing foreign matter from foreign matter on the surface of the thin strip W.

By the piston rods of the first cylinder device 30 and the second cylinder device 42 30A. The piston rod 42A is extended to hold the thin strip W, and the thin strip W is wound and supported on the support roller 12 to be conveyed. Thereby, foreign matter such as dust adhering to the surface of the thin strip W is transferred to the cleaning roller 14 and removed.

Further, the piston rod 54A of the third cylinder device 54 is extended. The adhesive roller 16 is pressed to the cleaning roller 14, and thus will be transferred to the cleaning roller 14. The foreign matter is further transferred to the adhesive roller 16 to be removed. Thereby, the foreign material on the surface of the conveyed thin strip W can be continuously removed.

When the foreign matter is removed, the central portion peripheral speed measuring unit 56A and the end are utilized. The partial peripheral speed measuring unit 56B sequentially measures the rotational circumferential speed V1 of the roller center portion of the cleaning roller 14 and the rotational circumferential speed V2 of the roller end portion of the backup roller 12, and sequentially transmits the measured values to the controller 60. The controller 60 calculates a circumferential speed difference ratio expressed by [(V2 - V1) / V1] × 100 based on the measured rotational circumferential speed V1 and the rotational circumferential speed V2, and determines whether or not the circumferential speed difference ratio is 0.5% or less.

Next, if the circumferential speed difference is 0.5% or less, the controller 60 removes the foreign matter. Device 10 is still operating. Further, when the weekly speed difference ratio exceeds 0.5%, the controller 60 controls at least one of the wrap angle adjusting unit 58A and the nip pressure adjusting unit 58B so that the circumferential speed difference ratio is 0.5% or less. That is, the wrap angle (θ) of the thin strip W wound around the support roller 12 is reduced by the wrap angle adjusting unit 58A so that the wrap angle (θ) is, for example, 20° or less. Then, the nip pressure adjusting unit 58B is adjusted so that the nip pressure is, for example, 0.5 N/cm or more and 1.0 N/cm or less.

Therefore, the circumferential speed difference rate is less than 0.5%, so the adhesive rubber roller is used. When the thin strip of foreign matter is removed, the removal efficiency of the foreign matter is good, and the stripe-like scratches P (refer to FIG. 4) or generated along the traveling direction of the thin strips on the back surface of the thin strip W (the surface without the coated film) can be effectively suppressed. dust.

Here, the magnitude of the tension or the clamping pressure according to the thin strip W is explained. Small, and a mechanism for generating a peripheral speed difference between the peripheral speed of the central portion of the cleaning roller 14 and the peripheral speed of the end portion.

Figure 5 is an exaggeration showing that the support roller 12 is deflected by the tension of the thin strip W. A diagram of the state of the bow. 6 is a cross-sectional view of the center portion of the roller of the support roller 12 shown in FIG. 5 taken along line a-a, and FIG. 7(A) is a cross-sectional view of the end portion of the cutting roller taken along line b-b.

When the support roller 12 is deflected by the tension of the thin strip W as shown in FIG. 5, The center portion of the roller of the cleaning roller 14 acts in a direction in which the clamping pressure is weakened. Therefore, as shown in FIG. 6, the deformation of the center portion of the roller of the cleaning roller 14 is small. Further, the center portion of the roller of the cleaning roller 14 is in contact with the thin strip W, and has adhesiveness and a large grip force to the thin strip W. Therefore, the cleaning roller 14 rotates at the same speed as the transport speed of the thin strip W.

On the other hand, both ends of the cleaning roller 14 are not supported by the thin strips W The holding roller 12 is in direct contact, and the roll surface length of the cleaning roller 14 is larger than the width of the thin strip W. Further, since the deflecting support roller 12 acts in the direction in which the nip pressure is increased, the deformation of both ends of the roller of the cleaning roller 14 is increased.

(B) of FIG. 7 is a contact portion of the roller end portion of the cleaning roller 14 and the support roller 12 A magnified view of the points. As shown in (B) of FIG. 7, the roller end portion of the rubber-made cleaning roller 14 (indicated by oblique lines) is concavely deformed at a portion indicated by B1-B2, and the rubber-made cleaning roller 14 is more than the support roller. 12 is softer. Further, both ends of the concave shape are slightly covered by the support roller 12, and as a result, the roller end portion of the cleaning roller 14 is in concave contact with the support roller 12 at the portion of A1-A2. Further, the length of the concave curve indicated by A1-A2 is larger than the length of the concave curve indicated by B1-B2, and therefore the rotational peripheral speed of the roller end portion of the cleaning roller 14 is larger than the rotational peripheral speed of the central portion of the roller.

Further, both ends of the roller of the cleaning roller 14 and the both ends of the roller of the backup roller 12 are straight Since the contact is clamped, the support roller 12 is rotated at the same rotational peripheral speed as the rotational peripheral speed of both end portions of the cleaning roller 14. That is, as described above, the rotational peripheral speed V2 of the roller end portion of the backup roller 12 can be regarded as the rotational peripheral speed of the roller end portion of the cleaning roller 14.

As a result, the rotation peripheral speed of the support roller 12 is larger than the conveyance of the thin strip W At the speed, the support roller 12 and the thin strip W generate a slip.

Thereby, as shown in FIG. 4, the dust adhered to the back surface of the thin strip W The foreign matter is caused to generate the scratches P on the back surface of the thin strip W in the direction in which the thin strips are conveyed. For example, a scratch of about 200 μm is produced due to 1% sliding. Moreover, it is easy to generate dust due to sliding.

And, due to the deflection of the support roller 12, the center portion of the roller of the cleaning roller 14 is The clamping pressure is weakened, whereby the foreign matter removal efficiency is also lowered.

Furthermore, the mechanism described above is a case where the support roller 12 is The tension of the thin strip W is deflected, whereby a peripheral speed difference is generated at the center portion of the roller of the cleaning roller 14 and the end portion of the roller. However, when the support roller 12 or the cleaning roller 14 is deflected by the nip pressure, the same mechanism is employed, and a peripheral speed difference is generated at the center portion of the roller of the cleaning roller 14 and the roller end portion.

Therefore, the inventors have made an effort to study the rotation of the center portion of the roller of the cleaning roller 14. The difference between the peripheral speed V1 and the rotational peripheral speed V2 of the both ends of the roller of the backup roller 12, in other words, the rotational peripheral speed V1 of the roller central portion of the cleaning roller 14 and the rotational peripheral speed of the both ends of the roller of the cleaning roller 14 The degree of the difference can be tolerated, and it is found that as long as the circumferential speed difference expressed by [(V2-V1)/V1]×100 is 0.5% or less, the foreign matter removal performance, scratches, and dust generation are suppressed. There are no practical problems in the aspect.

Further, the peripheral speed difference can be made 0.5% or less by performing at least one of the following three methods.

(1) A low deflection roller having a deflection amount of at least 50 μm in the axial direction of at least the support roller 12, the cleaning roller 14, and the cleaning roller 16 is used.

(2) The wrap angle (θ) of the thin strip W wound and supported on the support roller 12 is adjusted by the wrap angle adjusting unit 58A.

8 is a view showing a relationship between a wrap angle (θ) of the thin strip W wound around the backup roll 12 and a sheet tension of the sheet and a roll deflection amount (μm) of the backup roll 12. As is known from Fig. 8, under the same sheet tension, the larger the wrap angle (θ), the larger the amount of roll deflection of the support roller 12. Therefore, by reducing the wrap angle (θ) of the thin strip W wound and supported on the support roller 12 by the wrap angle adjusting unit 58A, the amount of roll deflection of the support roller 12 can be reduced. Thereby, according to the mechanism described above, the peripheral speed difference rate of the cleaning roller 14 can be reduced. The wrap angle (θ) is preferably set to 20° or less.

(3) The nip pressure between the support roller 12 and the cleaning roller 14 is adjusted by the nip pressure adjusting unit 58B.

FIG. 9 is a view showing the relationship between the nip pressure (N/cm) and the rotational peripheral speed of the backup roller 12. The line formed by the dots indicated by the triangle in Fig. 9 is the rotational peripheral speed (m/min) of the support roller 12. Further, the line formed by the dots indicated by the quadrilateral is the rotational peripheral speed (m/min) of the transport roller that transports the thin strip W, and corresponds to the transport speed of the thin strip W.

If the nip pressure is increased, the rotational peripheral speed of the roller end portion of the cleaning roller 14 is increased in accordance with the mechanism described above, and the rotational peripheral speed of the support roller 12 is increased accordingly. Big.

Therefore, by reducing the nip pressure of the support roller 12 and the cleaning roller 14 by the nip pressure adjusting unit 58B, the peripheral speed difference of the cleaning roller 14 can be reduced according to the mechanism described above. The nip pressure is preferably 0.5 N/cm or more and 1.0 N/cm or less.

[Examples]

The foreign matter removing method and the foreign matter removing device of the thin strip described in the embodiment of the present invention will be specifically described as a result of the test.

[Conditions of foreign matter removal device]

<thin slats>

. Type... TAC, triacetate cellulose

. Width...1490mm

. Transfer speed...100m/min

. Transfer tension...350N

<Support Roller>

. Roll surface length...1650mm

. Roller diameter...110mm

. Type... metal roll

. An aluminum tube type support roll having a deflection amount of about 600 μm and a low deflection type support roll having a deflection amount of about 50 μm were used.

<cleaning roller>

. Roll surface length...1650mm

. Roller diameter...110mm

. Type... adhesive rubber roller

. Rubber hardness...35°

. Adhesion...10hPa

. An aluminum tube type cleaning roller having a deflection amount of about 600 μm and a low deflection type cleaning roller having a deflection amount of about 50 μm were used.

<adhesive roller>

. Roll surface length...1650mm

. Roller diameter...100mm

. Type... adhesive rubber roller

. Adhesion...90hPa

. An aluminum tube type adhesive roller having a deflection amount of about 600 μm and a low deflection type adhesive roller having a deflection amount of about 50 μm were used.

<Remarks>

. In Table 1, the support roller is shown as "BUR", the cleaning roller is shown as "CLR", and the adhesive roller is shown as "adhesive R".

. In the "roller deflection amount" of Table 1, the deflection directions of the support roller and the cleaning roller and the adhesive roller are opposite, and therefore the amount of deflection of the support roller is marked "-".

. The "central peripheral speed" in Table 1 is the peripheral speed (V1) measured by the cleaning roller (CLR), and the "end peripheral speed" is the peripheral speed (V2) measured by the support roller (BUR).

. The "roller deflection amount" in Table 1 was measured by disposing a laser displacement meter at the center portion of the roller and both ends of the roller.

[evaluation project]

<Evaluation method of dust removal performance>

Light from one side of the thin strip from the light source and used on the other side A transmissive surface inspection device equipped with a charge coupled device (CCD) camera. In addition, the dust removal rate is a number of foreign matter per unit m (foreign matter of 10 μm or more) of the thin strip before dust removal by the cleaning roller, and the thin strip is removed by the cleaning roller. When the number of foreign matters per unit m (foreign matter of 10 μm or more) is B, it is represented by the following formula.

Dust removal rate (%) = [1-(B/A)] × 100

<Evaluation method of scratches on the back side of thin slats>

One surface of the thin strip is irradiated with light from the light source, and a reflective surface inspection device equipped with a CCD camera is used for the same surface as the light source.

Next, the number of the scratches is evaluated, and the number of the scratches is set to C (the scratch of 50 μm or more) per unit m of the thin strip before dust removal by the cleaning roller, and is used as C. When the number of scratches per unit area (scratch of 50 μm or more) of the thin strip after dust removal by the cleaning roller is set to D, it is expressed by the following formula.

Number of scratches = D-C (pieces / m)

<Method of evaluation>

*A... When the dust removal rate indicating the dust removal performance is 60% or more, the number of scratches on the back side of the thin strip is less than 0.001/m, which means "very good".

*B... The dust removal rate indicating dust removal performance is 40% or more to less than 60%, and the number of scratches on the back side of the thin strip is 0.001/m or more ~ less than 0.01/m means "good".

*C... When the dust removal rate indicating dust removal performance is less than 40%, and the number of scratches on the back side of the thin strip is 0.01/m or more, it means "poor".

[test results]

As known from the comparison of Test 1 to Test 4 in Table 1, when supporting rolls, cleaning When the roll and the adhesive roll were both aluminum-rolled rolls, and the holding pressure was fixed at 2.0 N/cm, the amount of deflection of the support roll was changed by changing the wrap angle of the thin strip of the support roll.

And, as known from the comparison of Test 5 to Test 8, by supporting the support roller For the low-flex roller, the amount of deflection of the support roller was reduced to 100 μm or less as compared with Test 1 to Test 4.

However, in Tests 1 to 8, the clamping pressure was large, 2.0 N/cm, and Moreover, the amount of deflection of the cleaning roller is as large as 100 μm, so the peripheral speed difference of the cleaning roller is as high as 1% to 2%. That is, the circumferential speed difference does not reach 0.5% or less which satisfies the present invention. As a result, the foreign matter removal performance was evaluated as "C" to "B", and the scratches on the back surface of the thin strip were evaluated as "C", and the overall evaluation was also "C".

In contrast, Test 9 was to reduce the clamping pressure of Test 8 to 1.0 N/cm. In the case of this, the amount of deflection of the cleaning roller was reduced to 50 μm. Thereby, the peripheral speed difference rate of the cleaning roller reaches 0.5%, thereby satisfying the present invention. As a result, the foreign matter removal performance of Test 9 was evaluated as "A", and the scratches on the back surface of the thin strip were evaluated as "B", and the overall evaluation was "B".

In addition, in Test 10 and Test 11, the support roller and the cleaning roller were set to two rollers. The low deflection roller was fixed at 20° and the clamping pressure was set to 2.0 N/cm and 1.0 N/cm. As a result, the amount of deflection of the support roller and the cleaning roller was reduced, and the peripheral speed difference of the cleaning roller was also reduced, which was 0.1% in Test 10. In Test 11, it was 0.0%. Thus, the foreign matter removal performance of Test 10 was "A", the scratch on the back side of the thin strip was "B", and the overall evaluation was also "B". Further, the foreign matter removal performance of the test 11, the scratch on the back side of the thin strip, and the overall evaluation were all evaluated as "A".

Further, in Test 12 and Test 13, the support roller, the cleaning roller, and the adhesive roller were set as low deflection rollers, and the wrap angle was fixed at 20°, and the nip pressure was set to 2.0 N/cm and 1.0 N/cm. Two levels to carry out the situation. As a result, the amount of deflection of the support roller, the cleaning roller, and the adhesive roller was reduced, and the peripheral speed difference of the cleaning roller was also reduced, which was 0.1% in Test 12 and 0.0% in Test 13. Thus, the foreign matter removal performance of the test 12 was "A", the scratch on the back side of the thin strip was "B", and the overall evaluation was also "B". Further, the foreign matter removal performance of the test 13, the scratch on the back side of the thin strip, and the overall evaluation were all evaluated as "B".

Further, in Test 14 and Test 15, the support roller, the cleaning roller, and the adhesive roller were set as low deflection rollers, and the wrap angle was fixed at 20°, and the nip pressure was set to 0.5 N/cm and 0.3 N/cm. Two levels to carry out the situation. As a result, when the nip pressure was set to 0.5 N/cm, the amount of deflection of the support roller, the cleaning roller, and the adhesive roller was reduced, and the peripheral speed difference of the cleaning roller also reached 0.0% in Test 14. Thus, in Test 14, the foreign matter removal performance was "A", the scratch on the back side of the thin strip was "A", and the overall evaluation was also "A".

On the other hand, when the nip pressure was set to 0.3 N/cm as in Test 15, the deflection amount of the support roller, the cleaning roller, and the adhesive roller was reduced, but the peripheral speed of the support roller became smaller than the cleaning. The center of the roller is at a peripheral speed. Thus, although the foreign matter removal performance of the test 15 is "B", the scratch on the back side of the thin strip is "C", comprehensive evaluation The price is also "C".

It can be seen that the clamping pressure is adjusted to 0.5 N/cm or more and 1.0. Below N/cm, the circumferential speed difference between the center portion of the roller of the support roller and the end portion of the roller is further reduced, so that the foreign matter removing performance can be improved, and on the other hand, the occurrence of scratches on the back surface of the thin strip can be more effectively prevented.

Moreover, as an evaluation item, there is no description of "dust generation", but It is also possible to effectively suppress "dust generation" by setting the circumferential speed difference of the cleaning roller to 0.5% or less.

According to the result of the embodiment, the winding is supported and supported on the support roller The package angle of the upper slats and the nip pressure of the support roller and the cleaning roller can make the cleaning roller have a peripheral speed difference of 0.5% or less.

And, according to the results of Test 1 to Test 15, foreign matter removal performance, thin The scratches on the back side of the slats and the overall evaluation were evaluated as "A" in which the circumferential speed difference rate was 0.0%, and the circumferential speed difference rate of 0.0% was said to be the best mode.

In this case, by using a low deflection roller for the support roller, the cleaning roller, Better results can be obtained with at least the support roller and the cleaning roller in the viscous roller.

However, in order to be applied to a large-sized liquid crystal display device or to improve the quality At the rate, the width of the optical film tends to be enlarged, and the lengths of the roll surfaces of the support roll, the cleaning roll, and the adhesive roll used are all lengthened, and it becomes easy to bend. Moreover, depending on the production line configuration of the optical film, the angle of the package wound on the support roller may have to be increased.

Therefore, it is preferred to use at least a support roller, a cleaning roller, and an adhesive roller. a low deflection roller having a deflection amount of 50 μm or less in the axial direction of the holding roller and the cleaning roller, and Further, the wrap angle adjustment unit and the nip pressure adjusting unit adjust the wrap angle or the nip pressure, thereby making the cleaning roll have a circumferential speed difference of 0.5% or less.

12‧‧‧Support roll

14‧‧‧cleaning roller

16‧‧‧Adhesive roller

18‧‧‧1st mobile platform

20‧‧‧Roll support table

22‧‧‧ Bearing

24‧‧‧Base

26‧‧‧1 track

28‧‧‧Linear guides

30‧‧‧1st cylinder device

30A‧‧‧Piston rod

32‧‧‧2nd mobile platform

34‧‧‧Roll support table

36‧‧‧ Bearing

38‧‧‧2nd track

40‧‧‧Linear guides

42‧‧‧2nd cylinder device

42A‧‧‧Piston rod

44‧‧‧3rd mobile platform

46‧‧‧Roll support table

48‧‧‧ bearing

50‧‧‧3rd track

52‧‧‧Linear guides

54‧‧‧3rd cylinder device

54A‧‧‧Piston rod

56A‧‧‧Central Speed Measurement Unit

56B‧‧‧End peripheral speed measuring unit

58B‧‧‧Clamping pressure adjustment unit

60‧‧‧ Controller

61‧‧‧guide roller

62‧‧‧Joint roller

63‧‧‧Cylinder unit

64‧‧‧ rod

W‧‧‧thin slats

Claims (9)

A foreign matter removing method for a thin strip, which uses a support roller and a cleaning roller to remove foreign matter adhering to a surface of the thin strip, the support roller winding and supporting the conveyed thin strip, and by the thin strip The transport roller is driven to rotate, the cleaning roller includes a roller circumferential surface having an adhesive rubber, and the foreign matter removing method of the thin strip is characterized by comprising the steps of: a transfer removing step, the support roller and the cleaning The thin strips are sandwiched between the rollers, whereby foreign matter adhering to the surface of the thin strip is transferred to the cleaning roller; the peripheral speed measuring step determines the rotational peripheral speed of the central portion of the roller of the cleaning roller V1 (m/min) and a rotation peripheral speed V2 (m/min) of the roller end portion of the support roller; and a circumferential speed difference rate adjustment step of adjusting the circumferential speed difference rate so that [(V2-V1) The circumferential speed difference ratio expressed by /V1]×100 satisfies 0.5% or less. The method of removing foreign matter of a thin strip according to claim 1, further comprising the steps of: pressing an adhesive roller to the cleaning roller to transfer the foreign matter transferred to the cleaning roller to the An adhesive roller comprising a roller circumferential surface having an adhesive layer. A foreign matter removing device for a thin strip, comprising: a supporting roller that winds and supports the conveyed thin strip, and is driven to rotate by the conveying of the thin strip; the cleaning roller, by the thin strip Rotating and moving, and including a circumferential surface of the roller having adhesive rubber, and sandwiching the thin strip between the support roller and the support roller Transferring the foreign matter adhering to the surface of the thin strip to the circumferential surface of the roller; the central portion peripheral speed measuring unit measures the rotational peripheral speed V1 of the central portion of the roller of the cleaning roller; and the end peripheral speed measuring unit And measuring a rotational peripheral speed V2 of the roller end portion of the support roller; and a circumferential speed difference adjustment unit that is adjusted by [(V2-V1)/ according to the measured values of the central portion of the roller and the both ends of the roller The peripheral speed difference ratio represented by V1]×100. A foreign matter removing device for a thin strip according to claim 3, comprising: an adhesive roller that presses the cleaning roller to transfer the foreign matter transferred to the cleaning roller to an adhesive layer The circumference of the roll is removed. The foreign matter removing device for a thin strip according to the third aspect of the invention, wherein the support roller and the cleaning roller are rollers having a deflection amount of 50 μm or less in the axial direction. The foreign matter removing device of the thin strip according to claim 3, wherein the peripheral speed difference adjusting unit is at least one of: a wrap angle adjusting unit, and the winding is adjusted in the Supporting a package angle of the thin strip on the roller; and clamping a pressure adjusting unit to adjust a clamping pressure for clamping the thin strip between the support roller and the cleaning roller. a foreign matter removing device for a thin strip as described in claim 6 of the patent application, The wrap angle adjusting unit sets the wrap angle to 20° or less. The foreign matter removing device for a thin strip according to claim 6, wherein the nip pressure adjusting unit adjusts the nip pressure to 0.5 N/cm or more and 1.0 N/cm or less. The foreign matter removing device for a thin strip according to claim 3, wherein the thin strip is any one of a base film, an intermediate product film, and a product film when the optical film is produced.