JP2016023058A - Cleaning device of sheet transportation roll, and sheet manufacturing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning device of a sheet transportation roll, and a sheet manufacturing method capable of providing a sheet of excellent surface quality that uses the same, capable of removing a sticking substance that sticks to a surface of the sheet transportation roll with no interruption of a production process, identifying position of a defect occurrence roll and a sticking substance in a short time from a sheet surface defect, and removing the sticking substance with sure by visual and direct confirmation.SOLUTION: A cleaning device 2 of a sheet transportation roll 4 is such a cleaning device 2 as removes a sticking substance sticking to a surface of the sheet transportation roll 4 by a cleaning part 18. The cleaning part 18 includes a scraper for removing the sticking substance, and sucking means for sucking the sticking substance that has been removed. The cleaning device 2 includes a corridor 1 on which a person rides, above the sheet transportation roll 4, which is capable of moving in sheet transportation direction.SELECTED DRAWING: Figure 1

Description

  The present invention can remove the adhering matter adhering to the surface of the sheet conveying roll without interrupting the production process. From the surface defect of the sheet, the position of the defect generating roll and the adhering matter can be identified in a short time and directly confirmed visually. The present invention relates to a sheet conveying roll cleaning device capable of reliably removing deposits and a sheet manufacturing method capable of obtaining a sheet having excellent surface quality using the same.

  On the surface of the sheet conveying roll that continuously conveys a sheet made of paper, cloth, thermoplastic resin, or the like, dust brought in by the sheet, dust around the sheet conveying roll, and foreign matters due to the sheet itself may adhere. Since these deposits may transfer or adhere to the surface of the sheet and cause defects or breakage of the sheet, once the deposit adheres to the sheet conveying roll, the production line is stopped and the sheet is stopped. Since the transport rolls must be cleaned, there is a problem in terms of cost due to a decrease in productivity in addition to the sheet quality.

  For example, in the case of producing a sheet made of a thermoplastic resin, the molten thermoplastic resin is cast while being cooled, and then the sheet is formed. The molecules are oriented by stretching in the direction and the width direction of the sheet perpendicular to the conveying direction, that is, in the transverse direction. In general, as an apparatus for stretching a sheet in a longitudinal direction, a stretching apparatus including a plurality of rotating rolls whose temperature can be freely adjusted is known. In this stretching apparatus, by heating or cooling the sheet with a rotating roll, by passing the sheet in a state where the rotating speed of the rotating roll on the outlet side is higher than the rotating speed of the rotating roll on the inlet side, The sheet can be stretched in the machine direction. At this time, as a problem when the sheet made of the thermoplastic resin comes into contact with the sheet conveying roll, in particular, a very small amount of monomer, oligomer, etc. present on the surface of the sheet, decomposed product, bleed-out product, addition A thing represented by a thing, a modified | denatured substance, etc. adheres to the roll surface which contacted this sheet | seat, and is deposited with time. These transfer or adhere to the surface of the sheet to cause defects or cause breakage of the sheet. Therefore, various roll cleaning methods have been proposed in order to remove deposits adhering to the surface of the sheet conveying roll that continuously conveys the sheet.

  In such a situation, the scraper can be pressed against the surface of the sheet conveying roll with high accuracy and with a target contact pressure, and the surface of the sheet conveying roll can be cleaned properly even with a high-precision roll with a small surface roughness. An apparatus has been proposed (Patent Document 1).

  Moreover, it can be removed and sucked without reattaching deposits, and the scraper replacement cycle is very long. Even if the sheet transport roll to be cleaned is longer than 1000 mm in the longitudinal direction, it can be evenly distributed. A cleaning device for a sheet conveying roll that can be cleaned and requires only a small suction power has been proposed (Patent Document 2).

JP 7-267420 A Japanese Patent No. 2718321

  The cleaning device for the sheet conveying roll described in Patent Document 1 provides the scraper to the surface of the sheet conveying roll by providing a pressure contact means capable of pressing the scraper on the surface of the sheet conveying roll with a contact pressure controlled to a predetermined pressure. It can be pressed with a well-targeted contact pressure, and deposits on the surface of a high-precision roll having a very small surface roughness can be completely removed. However, no consideration is given to the fact that the defect-developing roll causing the defect is identified in a short time from the surface defects of the sheet, and the deposits are reliably removed while directly visually confirming.

  The cleaning device for the sheet conveying roll described in Patent Document 2 has a scraper arranged at an optimum position and angle, and a suction means that can extremely lengthen the replacement cycle of the scraper by optimizing the scraper material. By moving the portion in the roll longitudinal direction, the deposits can be reliably removed substantially over the entire length of the roll. However, as in Patent Document 1, consideration is given to the fact that the defect-developing roll that is the cause is identified in a short time from the surface defects of the sheet, and the deposits are reliably removed while directly confirming visually. Absent.

  The object of the present invention is to remove the adhering matter adhering to the surface of the sheet conveying roll without interrupting the production process, identifying the position of the defect generating roll and the adhering matter in a short time from the sheet surface defect, and directly visually It is an object of the present invention to provide a sheet conveying roll cleaning device capable of reliably removing deposits while confirming, and a sheet manufacturing method capable of obtaining an excellent surface quality sheet using the same.

  The cleaning device for a sheet conveying roll according to the present invention is a cleaning device that removes the adhering matter adhering to the surface of the sheet conveying roll by a cleaning unit, and the scraper from which the cleaning unit removes the adhering matter, and the removed adhering matter. The cleaning device includes a corridor for a person to get on the sheet conveyance roll and is movable in the sheet conveyance direction.

  According to the present invention, it is possible to remove deposits adhering to the surface of the sheet conveying roll without interrupting the production process. From the defects on the sheet surface, the positions of the defect-generating roll and the deposits are identified in a short time, and directly confirmed visually. Therefore, it is possible to provide a sheet conveying roll cleaning device that can reliably remove deposits, and a sheet manufacturing method that can provide a sheet having excellent surface quality using the same.

  More specifically, in a sheet conveying roll that continuously conveys a sheet made of paper, cloth, thermoplastic resin, or the like, a cleaning device that removes deposits attached to the surface of the sheet conveying roll by a cleaning unit. The position of the defect-occurring roll and deposits is identified in a short time from the sheet surface defect, and the worker gets on the corridor provided in the cleaning device located above the sheet conveying roll and securely attaches it while visually checking it. It can be suitably used as a sheet conveying roll cleaning device capable of removing kimono and a sheet manufacturing method capable of obtaining an excellent surface quality sheet using the same.

FIG. 1 is a side view of a cleaning device for a sheet conveying roll. FIG. 2 is a schematic view of the sheet manufacturing method. FIG. 3 is a schematic view showing a sheet surface defect portion. FIG. 4 is a vertical cross-sectional view of the cleaning unit in the sheet conveying roll cleaning device.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings.

  The cleaning device for a sheet conveying roll according to the present invention is a cleaning device that removes the adhering matter adhering to the surface of the sheet conveying roll by a cleaning unit, and the scraper from which the cleaning unit removes the adhering matter, and the removed adhering matter. The cleaning device includes a corridor for a person to get on the sheet conveyance roll and is movable in the sheet conveyance direction.

  First, an example of the sheet conveying roll cleaning device of the present invention will be described with reference to the side view of the sheet conveying roll cleaning device shown in FIG. The present invention is not limited to this.

  A plurality of sheet conveying rolls 4 are arranged in the sheet conveying direction, and are wound at a predetermined angle to hold the sheet 5 by friction on the roll surface. In order to efficiently secure the winding angle, a structure in which the upper and lower sides of the roll are conveyed alternately in a plow shape is preferable. A nip roll (not shown) may be arranged and nipped between the sheet conveying roll 4 and the nip roll for gripping.

  When stretching the sheet 5 while transporting the sheet 5 of thermoplastic resin, it is desirable that the sheet transport roll 4 is controlled to a temperature suitable for each purpose of heating, stretching and cooling. At this time, the roll in the stretching section is stretched while being conveyed by gradually increasing the peripheral speed.

  The corridor 1 is a scaffold on which a person can ride to visually check the surface of the sheet conveying roll 4. It is desirable to have a handrail-shaped safety fence so that a person on the corridor 1 does not fall. The walkway 1 is preferably movable on the sheet transport direction moving rail 3 in order to prevent the sheet transport roll 4 immediately below the walkway 1 from interfering with the walkway 1 itself. As a result, it is possible to visually check all the predetermined rolls in one corridor.

  In order to clean the surface of the sheet conveying roll 4, it may be cleaned manually by using a cleaning jig having a cleaning portion 18 at the end of a long stick. However, since the jig is caught, there is a safety problem. Since there is a problem that the cleaning result differs because the force applied and the pressing angle are different depending on the person to be cleaned, it is desirable to clean with the cleaning device 2.

  The sheet conveying roll cleaning device of the present invention presses the cleaning unit 18 suitable for cleaning the sheet conveying roll 4 with a pressing mechanism 17 having a structure in which the pressing angle of an air cylinder or the like is always constant and the pressing force can be finely adjusted. . Further, the cleaning device 2 is configured to be movable integrally with the walkway 1.

  The cleaning device for a sheet conveying roll of the present invention can be suitably used for cleaning a roll for conveying a sheet made of paper, cloth, thermoplastic resin, or the like. In particular, it is preferably used for cleaning a roll for conveying a sheet made of a thermoplastic resin. Typical examples of the thermoplastic resin include resins selected from polyesters, polyamides, polyolefins, polyphenyl sulfides, mixtures thereof, modified products, and the like, and polyester resins are particularly preferable.

  The deposit in the present invention is derived from a thermoplastic resin, for example, and includes various organic compounds generated in the production process as components. For example, a low molecular weight product, a decomposed product, a bleed-out product, or an additive of the thermoplastic resin. Further, sublimates, oils and fats, dusts and the like contained in the air are also included. When the thermoplastic resin is a polyester resin, for example, polyethylene terephthalate, the main low molecular weight substances are monomers such as terephthalic acid, bishydroxyethyl terephthalic acid, monohydroxyethyl terephthalic acid, and dimers, trimers, and cyclic trimers. Oligomers such as are targeted.

  Although it does not specifically limit as a sheet | seat conveyance roll used as the object of cleaning in this invention, For example, in the case of the sheet | seat conveyance roll which conveys the sheet | seat which consists of thermoplastic resins, what has an extending process in the manufacturing process of this sheet | seat is the said sheet | seat. Stretching rolls that stretch in the sheet conveyance direction, that is, stretching rolls in a longitudinal stretching machine that stretches the sheet in the longitudinal direction are the most likely to accumulate dirt and cause defects in the sheet. Is preferred.

  In the cleaning device for a sheet conveying roll according to the present invention, the scraper is preferably made of zirconia ceramics, cemented carbide or hardened carbon steel.

  Generally, as a material of a scraper, stainless steel, carbon steel, tool steel, etc. are mentioned as a metal. When the scraper is made of general carbon steel, stainless steel, or the like, there is a problem that the cutting edge wears down and the ability to remove deposits decreases rapidly. Depending on the conditions, multiple scrapers may be required for one cleaning. In this case, in addition to the problem that it takes time to replace the scraper, there is a problem that the replacing operation itself of the scraper is very difficult. Therefore, as the characteristics required as the material of the scraper, optimum strength and flexibility are required in relation to the strength of the surface of the sheet conveying roll that comes into contact. In the case of using ceramics as the material of the scraper, examples thereof include alumina and nitrogen silicon, but zirconia is preferable. The Vickers hardness Hv is preferably about 1200 to 1600. Further, when carbon steel is used as the material of the scraper, the hardening treatment of the carbon steel is good for quenching. The Vickers hardness Hv is preferably about 850 to 900. In the case of cemented carbide, the Vickers hardness Hv is preferably about 1500 to 1800.

The cleaning device for a sheet conveying roll according to the present invention is characterized in that the cleaning unit includes suction means for sucking the deposits removed by the scraper. The suction ability of the suction means is preferably 15 kPa or more and 40 kPa or less. If the suction static pressure is less than 15 kPa, the deposits peeled off by the scraper cannot be completely sucked and may re-adhere to the roll surface. When the suction static pressure exceeds 40 kPa, the flexible piping part may be crushed by the suction pressure, peeled off by the scraper, and the deposit cannot be completely sucked, and may reattach to the roll surface. Here, “suction static pressure” referred to in the present invention refers to a source pressure. Further, when the distance between the tip of the scraper and the suction port is 20 mm and the maximum flow rate is 1 m ³ / min, the flow velocity in the vicinity of the scraper blade is preferably 10 m / sec.

  It is preferable that the pressing force of the scraper in the present invention is a constant load in the range of 0.5 kgf to 2.5 kgf with respect to the rotation axis direction of the sheet conveying roll of the scraper, that is, the contact portion with the roll longitudinal direction. Further, the length (blade width) of the scraper is preferably short to improve the uniformity and controllability of the pressing force, and is preferably long to shorten the cleaning time. The specific length is preferably about 30 mm to 200 mm. As for the edge shape (edge angle) of the scraper, an acute angle has a higher cleaning ability, and an obtuse angle has a higher wear resistance. Specifically, it is preferable that the blade edge angle is about 10 ° to 40 °. The thickness of the scraper is preferably thin for improving the edge re-polishing property, and thicker for improving the bending resistance. Specifically, the thing of about 0.1 mm-1.0 mm is preferable.

  FIG. 4 shows a longitudinal sectional view of the cleaning portion in the sheet conveying roll cleaning device of the present invention. The roll cleaning method in the present invention cleans the entire roll surface while moving the cleaning unit 18 of the cleaning device 2 in the roll longitudinal direction of the rotating sheet transport roll 4, that is, in the direction orthogonal to the sheet transport direction. The movement in the roll longitudinal direction may be manually moved or automatically moved by a drive motor.

  In the present invention, the angle formed by the scraper 21 and the sheet conveying roll 4 is 45 ° toward the upstream side of the sheet conveying roll 4 (the direction opposite to the rotation direction of the sheet conveying roll). It has a rake angle of 15 ° to 75 ° with respect to the roll tangent in the range of °, that is, the contact point between the blade edge and the roll. When the rake angle of the scraper 21 is within this range, the adhering matter adhering to the sheet conveying roll 4 is on the surface of the sheet conveying roll 4 in a direction perpendicular to the roll rotation axis, that is, relative to the upstream side in the sheet conveying direction. Although it has a speed component, it actually collides with the scraper 21 that is stationary in the sheet conveying direction and is removed from the surface of the sheet conveying roll 4, and at the same time, the removed deposit is dammed by the scraper 21. Then, it has a velocity component toward the upstream in the sheet conveying direction relative to the surface of the sheet conveying roll 4, as if the removed deposit is directed upstream in the sheet conveying direction by the scraper 21. It will be scraped off. Accordingly, the suction nozzle 22 of the cleaning device 2 that sucks the removed deposit is provided on the upstream side of the blade edge in the sheet conveying direction so as to open facing the blade edge.

  The suction of the suction nozzle 22 is connected to the suction side of the suction blower 20 fixed in the vicinity of the sheet conveying roll 4, and is used to check the clogging of the dust collector 19 and the dust collector 19 for collecting the sucked deposits. It is desirable that the pressure gauge 25 is constituted by a suction pipe 24 for connecting them, and a flexible pipe 23 for following the movement of the corridor 1 in the sheet conveying direction and the movement of the cleaning device 2 in the roll longitudinal direction.

  A schematic view of a specific sheet manufacturing method of the present invention is shown in FIG. The present invention is not limited to this.

  In the case of a sheet manufacturing method of a sheet 5 made of a thermoplastic resin (hereinafter sometimes referred to as a resin film), raw material resin pellets are supplied to an extruder 10 as an extrusion means and melted in a temperature range from a melting point to plus 70 ° C. After weighing with a gear pump in a state, the molten resin is filtered with a filtration device to remove foreign matters and gelled substances. Next, the resin melt that has passed through the filtering device is formed into a target width and thickness by a die 11 that is a die means, and then continuously discharged as a fixed amount of sheet-like melt. Next, an electrostatic charge is deposited on the extruded sheet-like melt from the upper surface or the lower surface, and cooled on the surface of the rotating cooling body 12 (also called a casting drum) as a cooling means in a temperature range of 10 ° C. to 60 ° C. Solidify to obtain an unstretched resin film. As a method for casting the resin film, air is blown out from a slit-like, spot-like or planar air supply device (also called an air chamber), and is brought into close contact with the rotating cooling body 12 to be cooled and solidified. A method of closely contacting the body 12 and cooling and solidifying the body 12 is also preferable. Next, biaxial stretching of the unstretched resin film is performed using a stretching apparatus. Here, in general, as a biaxial stretching method for the purpose of imparting molecular orientation to a film to improve physical strength and the like, an unstretched film is transported in a film stretching direction by a longitudinal stretching machine 13, that is, longitudinally. After stretching in the direction, the uniaxially stretched film stretched in the longitudinal direction is stretched in the width direction of the film perpendicular to the conveying direction by the stenter 14, that is, in the transverse direction, or the unstretched film is stretched by the stenter 14 A simultaneous biaxial stretching method in which the longitudinal direction and the transverse direction are simultaneously stretched is known.

  As an example of the sheet manufacturing method of the present invention, a sequential biaxial stretching method will be described. The unstretched resin film is stretched in the sheet conveying direction, that is, in the longitudinal direction, using a longitudinal stretching machine (stretching machine in the sheet conveying direction) 13. Stretching in the sheet conveying direction refers to stretching for imparting molecular orientation in the sheet conveying direction, and is usually performed by a difference in roll peripheral speed, and this stretching may be performed in one stage, You may carry out in multiple steps using a roll pair. As the draw ratio of the resin film, 2 to 8 times is preferably used. The stretching temperature is preferably a temperature range of plus 90 ° C. from the glass transition temperature of the resin constituting the resin film. After the surface treatment such as corona treatment, flame treatment, and plasma treatment is applied to the uniaxially stretched resin film thus obtained, functions such as easy slipping, easy adhesion, and antistatic properties May be applied by applying a coating solution with a coating apparatus as a coating means during the resin film manufacturing process.

  Next, the resin film uniaxially stretched in the longitudinal direction is preheated in the stenter preheating chamber using the stenter 14, and stretched in the width direction of the film perpendicular to the sheet conveying direction, that is, in the transverse direction in the stenter stretching chamber. Stretching in the width direction refers to stretching for imparting molecular orientation in the width direction of the resin film, and exits from the entrance of the stenter along the rails located at both end portions in the width direction of the resin film in the stenter. With a number of clips moving toward the part, it is conveyed while gripping both side ends in the width direction of the resin film, and stretched in the width direction of the resin film. As the draw ratio of the resin film, 2 to 8 times is preferably used. The stretching temperature is preferably a temperature range of plus 90 ° C. from the glass transition temperature of the resin constituting the film. The biaxially stretched resin film is heat-treated in a temperature range of 150 ° C. to 250 ° C. in a stenter heat fixing chamber in order to impart flatness and dimensional stability. After being heat-treated in this manner, it is cooled to room temperature while being uniformly cooled in the width direction in the stenter cooling chamber, and wound up by the turret winder 15 as a winding means to obtain a biaxially stretched resin film . Moreover, you may use a relaxation process etc. together in the case of cooling from heat processing as needed.

  The installation position of the in-line inspection device 16 in the present invention is preferably between the stenter 14 and the turret winder 15. According to the sheet manufacturing method of the present invention, the surface defect of the resin film is detected by the in-line inspection device 16 and analyzed by the data processing device in the sheet conveying direction and the roll longitudinal direction. By specifying the position of the kimono, the cause deposit can be reliably removed in a short time.

  FIG. 3 is a schematic view showing a sheet surface defect portion. In general, the occurrence state of the defect is mapped and grasped visually or by the in-line inspection device 16. Scratch-like defects caused by the sheet conveying roll 4 occur at a pitch of the outer peripheral length of the sheet conveying roll 4, and therefore occur at different pitches when the diameters are different. When the sheet 5 is stretched in the conveying direction while being conveyed, the pitch of the defects is different even if the diameter of the sheet conveying roll 4 is the same. Since the scratches generated due to the sheet conveying roll 4 before stretching are stretched thereafter, the pitch becomes longer accordingly. Since the scratch A6 is generated due to the roll for cooling after stretching, the pitch is the generated pitch A7. On the other hand, since the scratch B8 is generated due to the stretching roll, the pitch is the generated pitch B9. Therefore, the generated pitch B9 is longer than the generated pitch A7 by the amount that is extended until cooling.

  In the sheet manufacturing method of the present invention, the sheet 5 is continuously conveyed by the sheet conveying roll 4 and wound up by the turret type winder 15, while the winding of the sheet 5 is continued. The defect occurrence roll is estimated based on the information of 16 and the defect occurrence roll is cleaned by using the sheet conveying roll cleaning device of the present invention.

  According to the present invention, it is possible to remove deposits adhering to the surface of the sheet conveying roll without interrupting the production process. From the defects on the sheet surface, the positions of the defect-generating roll and the deposits are identified in a short time, and directly confirmed visually. However, it is possible to reliably remove deposits and to obtain a sheet with excellent surface quality.

  EXAMPLES Hereinafter, although this invention is demonstrated along an Example, this invention is not restrict | limited by these Examples. Various characteristics were carried out by the following methods.

(Evaluation of sheet after cleaning the roll)
After illuminating the sheet with LED illumination of 800 lux and visually inspecting the entire length of the sheet in the sheet conveyance direction for 1 m, check the part that appears to be scratched with a microscope, and if it is a scratch, measure the length in the longitudinal direction. To do. For those having a length in the longitudinal direction of 0.1 mm or more, the number of occurrences was counted to map the occurrence state, and evaluated according to the following criteria.
(Double-circle): There was no part which seems to be a crack by visual inspection. (Since it was possible to eliminate scratches in a very short time, production loss was small.)
◯: There was no part that seemed to be scratched by visual inspection.
(Triangle | delta): Although the part considered to be a crack was found in the visual inspection, there was no thing more than 0.1 mm as a result of the measurement with a microscope.
X: The part which seems to be a wound by visual inspection was found, and there was a thing of 0.1 mm or more as a result of the measurement with a microscope.

Example 1
The cleaning device 18 for the sheet conveying roll 4 shown in FIGS. 1 and 2 was used to clean the sheet conveying roll 4 by the cleaning unit 18 shown in FIG. The scraper 21 is made of zirconia ceramic, the blade width is 45 mm, the surface material of the sheet conveying roll 4 is chrome plated, the pressing force of the scraper 21 is 1 kgf, and the suction static pressure of the suction blower 20 is 20 kPa.

  While a 150 μm thick PET resin film was being conveyed at a speed of 70 m / min, a scratch-like defect with a length of 0.3 mm in the longitudinal direction was found. As a result of visual inspection, deposits were found on the roll surface, so that the deposits could be removed by cleaning with a cleaning device, and scratch-like defects were eliminated.

(Example 2)
The cleaning device 18 for the sheet conveying roll 4 shown in FIGS. 1 and 2 was used to clean the sheet conveying roll 4 by the cleaning unit 18 shown in FIG. The scraper 21 is made of zirconia ceramic, the blade width is 45 mm, the surface material of the sheet conveying roll 4 is chrome plated, the pressing force of the scraper 21 is 1 kgf, and the suction static pressure of the suction blower 30 is 20 kPa.

  While a biaxially stretched PET resin film having a thickness of 50 μm was conveyed at a speed of 150 m / min, a scratch-like defect having a longitudinal length of 0.12 mm was detected by the in-line inspection device 16. The defect generation pitch (longitudinal direction) was 1.900 mm, and the lateral direction (roll longitudinal direction) position was 1022 mm from the right side toward the upstream side in the sheet conveying direction. Since the longitudinal draw ratio is 3 times (1.73 × 1.73) and the draw roll diameter is φ350 mm and 1.73 times, the cause roll is specified as the second draw from the generated pitch. Further, since the lateral direction is four times as large as the lateral direction position, it is specified as a position of 255 mm from the right side toward the upstream side in the sheet conveying direction, and the corridor 1 provided in the cleaning device 2 located above the longitudinal stretching machine 13. When the cleaning was carried out while checking the surface of the sheet conveying roll 4 of the corresponding part, the occurrence of scratch-like defects disappeared.

(Example 3)
The cleaning device 18 for the sheet conveying roll 4 shown in FIGS. 1 and 2 was used to clean the sheet conveying roll 4 by the cleaning unit 18 shown in FIG. The scraper 21 is made of carbon steel whose surface is nitrided, the blade width is 45 mm, the surface material of the sheet conveying roll 4 is chrome plating, the pressing force of the scraper 21 is 1.2 kgf, and the suction static pressure of the suction blower 20 is 10 kPa. is there.

  A flaw-like defect having a length of 0.25 mm in the longitudinal direction was found in the defect inspection machine 16 while a PET resin film having a thickness of 120 μm was being conveyed at a speed of 100 m / min. I got on the corridor 1 equipped in 2 and visually confirmed the surface of the sheet conveying roll 4, and found deposits on the roll surface, so I thought that I could remove the deposits when cleaned with the cleaning device 2, Upon inspection, a flaw-like defect of 0.12 mm was found when it was shifted 100 mm from the original scratch location. As a result of measuring the suction wind speed of the suction nozzle 22 during operation of the suction blower 20, the wind speed was 2 m / sec or less, and almost no suction was possible.

Example 4
The cleaning device 18 for the sheet conveying roll 4 shown in FIGS. 1 and 2 was used to clean the sheet conveying roll 4 by the cleaning unit 18 shown in FIG. The scraper 21 is made of cemented carbide, the blade width is 45 mm, the surface material of the sheet conveying roll 4 is chrome plated, the pressing force of the scraper 21 is 1.2 kgf, and the suction static pressure of the suction blower 20 is 50 kPa.

  While a PET resin film having a thickness of 120 μm is being conveyed at a speed of 100 m / min, a flaw-like defect having a longitudinal length of 0.25 was found in the in-line inspection device 16, so a cleaning device located above the longitudinal stretching machine 13 When the surface of the sheet conveying roll 4 was visually checked on the corridor 1 equipped with No. 2, the deposit was found on the surface of the roll. As a result, a scratch defect of 0.12 mm was found at a position 80 mm away from the original scratch location. As a result of measuring the suction wind speed of the suction nozzle 22 during the operation of the suction blower 20, the wind speed was 1 m / sec or less, and the flexible pipe 23 was crushed and closed.

(Comparative Example 1)
The sheet conveying roll 4 was cleaned using the cleaning device 2 for the sheet conveying roll 4 shown in FIGS. The cleaning device 2 does not include the walkway 1, the scraper 21 is made of cemented carbide, the blade width is 45 mm, the surface material of the sheet conveying roll 4 is chrome plated, the pressing force of the scraper 21 is 2.0 kgf, and the suction blower The suction static pressure of 20 is 0 kPa.

  While a PET resin film with a thickness of 120 μm was being transported at a speed of 100 m / min, a flaw-like defect with a longitudinal length of 0.25 mm was found by visual inspection. As a result, the sheet conveyance was stopped once and all the sheet conveyance rolls 4 were cleaned.

  According to the present invention, in a sheet conveying roll that continuously conveys a sheet made of paper, cloth, thermoplastic resin, or the like, it is possible to remove deposits adhering to the surface of the sheet conveying roll without interrupting the production process. A sheet transport roll cleaning device that can identify the position of the defect-generating roll and deposits in a short time from the surface defects, and remove the deposits while confirming directly by visual observation, and excellent surface quality using the same. The sheet manufacturing method which can obtain the sheet | seat of this can be provided.

1: Walkway 2: Cleaning device 3: Rail for moving sheet conveyance direction 4: Sheet conveyance roll 5: Sheet 6: Scratch A
7: Generated pitch A
8: Scratch B
9: Generated pitch B
DESCRIPTION OF SYMBOLS 10: Extruder 11: Base 12: Rotary cooling body 13: Longitudinal drawing machine 14: Stenter 15: Turret type winder 16: Inline inspection device 17: Pressing mechanism 18: Cleaning part 19: Dust collector 20: Suction blower 21: Scraper 22: Suction nozzle 23: Flexible piping 24: Suction piping 25: Pressure gauge

Claims (4)

A cleaning device that removes deposits adhered to the surface of the sheet conveying roll by a cleaning unit,
The cleaning unit has a scraper for removing the deposit, and suction means for sucking the removed deposit,
A cleaning device for a sheet transport roll, wherein the cleaning device includes a walkway for a person to get above the sheet transport roll and is movable in the sheet transport direction.   The sheet conveying roll cleaning device according to claim 1, wherein the suction means has a suction capacity of 15 kPa to 40 kPa.   The cleaning device for a sheet conveying roll according to claim 1 or 2, wherein the sheet conveying roll is an extending roll extending in a sheet conveying direction.   In the process until the sheet is continuously conveyed by the sheet conveyance roll and wound by the turret type winder, the defect occurrence roll is estimated based on the information of the inline inspection device while continuing the winding of the sheet, The sheet manufacturing method which cleans a defect generation | occurrence | production roll using the cleaning apparatus of the sheet | seat conveyance roll in any one of Claims 1-3.

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