JP2007083188A - Nozzle and device for suction of coating solution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle and a device for suction of a coating solution allowing easy removal of the choking matter. <P>SOLUTION: A suction tube 54 is removable from an outer tube 52, thereby easily cleaning deposited matter, i.e. the solidified coating solution deposited on the outer peripheral surfaces of a coating solution suction inlet 38 and the suction tube 54 and deposited matter deposited on the inside of the suction tube 54. When the coating solution suction nozzle 14 is choked, it is unnecessary to remove of the whole of the nozzle 14 from the body 42 of the device 10. Instead, it is sufficient that a fresh or an preliminarily cleaned spare suction tube 54 is attached to the outer tube 52 after removal of the suction tube 54 of the nozzle 14 from the outer tube 52, resulting in a substantial reduction of the time for interruption of the device 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coating liquid suction nozzle and a coating liquid suction device for sucking a coating liquid applied to a coating surface of a coating object.

  As a method for transferring the coating solution to the continuously running belt, a roller coating method, a dip coating method, a fountain coating method, etc. are known, and as a method for controlling the transferred coating solution to a predetermined film thickness, an air knife coating is used. Methods, blade coating methods, bar coating methods and the like are known.

  Of these coating methods, in the case of the bar coating method in which the coating rod that rotates by contact with the traveling belt-like material picks up the coating liquid and transfers it to the belt-like material, and then controls the film thickness by the rod surface roughness, Due to the surface tension of the coating solution, the belt-like object edge is thickly coated. The same applies when coating up to the edge of the belt in other coating methods.

  For this reason, as a preventive measure, a method of scraping off the coating solution at the thick coating portion with a blade, a method of blowing out the thick coating with air after coating, a method of sucking and removing the thick coating portion after coating, and the like are disclosed.

  Among these, in the method (Patent Documents 1 to 6) using the coating liquid suction nozzle that sucks and removes the thick coating portion after coating, the sucked coating liquid evaporates under a pressure of 1 atm or less, and the concentration of the coating liquid increases. Then, it is dried and fixed in the coating liquid suction nozzle.

For this reason, the cleaning liquid is supplied into the coating liquid suction nozzle simultaneously with the suction of the coating liquid. However, the countermeasure is not complete, and the coating liquid suction nozzle is clogged, resulting in insufficient suction of the coating liquid. Thick coating remains on the edges of the film or uneven suction occurs. Therefore, each time, the coating liquid suction device must be stopped for a long time to clean the coating liquid suction nozzle.
JP-A-56-73579 Japanese Utility Model Publication No. 60-49949 Japanese Patent Laid-Open No. 2-99166 JP-A-7-299410 JP 2002-66430 A JP 2002-282765 A

  An object of the present invention is to provide a coating liquid suction nozzle and a coating liquid suction device that can easily remove clogging in consideration of the above facts.

  The invention according to claim 1 is a coating liquid suction nozzle that sucks the coating liquid applied to the coating surface of the belt-shaped object, and includes a coating liquid suction port that sucks the coating liquid and a cleaning liquid supply port to which the cleaning liquid is supplied. An outer tube formed with, and a suction tube that is detachably inserted into the outer tube and sucks the coating liquid sucked from the coating liquid suction port and the cleaning liquid supplied from the cleaning liquid supply port. It is structured.

  In the first aspect of the invention, the coating liquid suction nozzle is provided with an outer tube in which a coating liquid suction port for sucking the coating liquid and a cleaning liquid supply port for supplying the cleaning liquid are formed. By inserting the suction pipe into the outer pipe, the coating liquid suction port and the cleaning liquid supply port formed in the outer pipe can be communicated with the suction pipe.

  In addition, since the suction tube can be detached from the outer tube by making the suction tube detachable from the outer tube, a fixed object (the coating solution is solidified) fixed to the coating liquid suction port or the outer peripheral surface of the suction tube. Etc.) and fixed matter adhering to the inside of the suction tube can be easily washed.

  By the way, the suction pipe is smaller in diameter than the outer pipe, and the coating liquid flows in the suction pipe. Therefore, even if the inside of the suction pipe is washed, the fixed matter due to the coating liquid cannot be completely removed, but should be replaced at a predetermined cycle. However, by making the suction tube detachable from the outer tube, only the suction tube can be replaced, and the running cost can be reduced compared to the case where the entire coating liquid suction nozzle is replaced. .

  According to a second aspect of the present invention, there is provided the coating liquid suction nozzle according to the first aspect, wherein a solvent-resistant sealing material is used at a joint portion between the outer tube and the suction tube.

  In the invention according to claim 2, by using a solvent-resistant sealing material at the joint portion of the outer tube and the suction tube, the space between the outer tube and the suction tube is sealed so that the cleaning liquid and the coating liquid do not leak. Yes. Moreover, since it is a solvent-resistant sealing material, deterioration of the sealing material due to the solvent can be prevented.

  A third aspect of the present invention is a coating liquid suction device that sucks a coating liquid applied to a coating surface of a belt-shaped object, the coating liquid suction nozzle for sucking the coating liquid, the coating liquid suction nozzle, and a strip shape A main body portion that determines and holds a relative position with respect to an object, the coating liquid suction nozzle is positioned and fixed to the main body portion, and a cleaning liquid supply for supplying a coating liquid suction port and a cleaning liquid for sucking the coating liquid is provided. An outer tube in which a mouth is formed, a suction tube that is detachably inserted into the outer tube and sucks the coating liquid sucked from the coating liquid suction port and the cleaning liquid supplied from the cleaning liquid supply port; It is characterized by comprising.

  In the invention described in claim 3, the application liquid suction nozzle for sucking the application liquid applied to the application surface of the belt-like object is held by the main body portion in a state where the relative position to the belt-like object is determined. Here, the outer tube of the coating liquid suction nozzle is positioned and fixed to the main body, and the suction tube is detachably inserted into the outer tube.

  For this reason, when the clogging of the coating liquid suction nozzle occurs, it is not necessary to remove the entire coating liquid suction nozzle from the main body. After the suction pipe of the coating liquid suction nozzle is removed from the outer tube, it is new or already cleaned. Since it is only necessary to attach the spare suction pipe that is used to the outer pipe, the time for stopping the coating liquid suction apparatus can be greatly reduced.

  Also, when the entire application liquid suction nozzle is attached to or detached from the main body, after the application liquid suction nozzle is washed, when the application liquid suction nozzle is installed in the main body, the position of the application liquid suction port of the application liquid suction nozzle is aligned. There is a need. In this case, it is necessary to measure the gap between the coating liquid suction nozzle and the roll that supports the belt-like object, and to align the coating liquid suction nozzle again.

  However, in the present invention, the outer tube is positioned and fixed to the main body in a state where the relative position with respect to the belt is determined, and the suction tube is attached to and detached from the outer tube. And the relative position remains.

  Therefore, it is not necessary to position the coating liquid suction port every time the coating liquid suction nozzle is cleaned, and it is not necessary to stop the coating liquid suction device for a long time. For this reason, productivity of the lithographic printing plate can be improved. Further, since only the suction pipe can be replaced, the productivity of the lithographic printing plate can be improved as compared with the case where the entire coating liquid suction nozzle is replaced.

  In the first aspect of the invention, since the suction tube can be detached from the outer tube by making the suction tube detachable from the outer tube, the solid tube fixed to the coating liquid suction port or the outer peripheral surface of the suction tube is secured. It is possible to easily wash a kimono (such as a solidified coating solution) or a sticking material adhering to the inside of the suction tube. Further, by making the suction tube detachable from the outer tube, it is possible to replace only the suction tube, and it is possible to reduce the running cost compared to the case where the entire coating liquid suction nozzle is replaced.

  In the invention according to claim 2, the space between the outer tube and the suction tube can be sealed to prevent the leakage of the cleaning liquid and the coating liquid. Moreover, since it is a solvent-resistant sealing material, deterioration of the sealing material due to the solvent can be prevented.

  In the invention according to claim 3, when the coating liquid suction nozzle is clogged, it is not necessary to remove the entire coating liquid suction nozzle from the main body, and after removing the suction pipe of the coating liquid suction nozzle from the outer tube Since a new or already cleaned spare suction pipe may be attached to the outer pipe, the time for stopping the coating liquid suction apparatus can be greatly reduced. Further, it is not necessary to position the coating liquid suction port every time the coating liquid suction nozzle is cleaned, and it is not necessary to stop the coating liquid suction device for a long time, so that the productivity of the lithographic printing plate can be improved. Further, since only the suction pipe can be replaced, the productivity of the lithographic printing plate can be improved as compared with the case where the entire coating liquid suction nozzle is replaced.

  FIG. 1 shows a coating liquid suction system system of the coating liquid suction apparatus 10.

  The coating liquid suction system system is provided with a vacuum pump 12 so as to lower the pressure of the entire coating liquid suction system system. A coating liquid suction nozzle 14 is connected to the vacuum pump 12 via a vacuum tank 16, and the suction pressure of the coating liquid suction nozzle 14 is determined by the pressure of the vacuum tank 16.

  A buffer tank 20 is connected between the vacuum pump 12 and the vacuum tank 16 via a filter 18, and the pressure variation in the vacuum tank 16 is prevented by the buffer tank 20. Further, a pressure adjustment valve 22 is connected between the buffer tank 20 and the vacuum tank 16, and the pressure of the vacuum tank 16 is released and adjusted based on the value of the vacuum pressure gauge 24 connected to the vacuum tank 16. .

  Further, a cleaning liquid stock tank 28 is connected to the vacuum tank 16 via a vacuum-resistant liquid feed pump 26 and a filter 18. Here, the liquid sucked by the coating liquid suction nozzle 14 (hereinafter referred to as “suction liquid”) is accumulated in the vacuum tank 16 and is discharged or returned to the cleaning liquid stock tank 28 by the vacuum feed pump 26.

  When discharging the suction liquid, only the cleaning liquid is supplied to the cleaning liquid stock tank 28. On the other hand, when the suction liquid is returned to the cleaning liquid stock tank 28, a part of the suction liquid is discharged and mixed with the cleaning liquid corresponding to the reduced liquid amount. The liquid in the cleaning liquid stock tank 28 is sucked by the suction pressure of the coating liquid suction nozzle 14, and the flow rate set by the flow rate setting valve 34 based on the numerical value of the flow meter 32 is supplied to the coating liquid suction nozzle 14.

  Here, the inner diameter and suction pressure of the coating liquid suction port 38 of the coating liquid suction nozzle 14 (see FIG. 4A, which will be described later) are set at the edge of the belt-like object (web 40 (see FIG. 2)) to be conveyed. Although selection is required depending on the amount of liquid, the inner diameter of the coating liquid suction port 38 is preferably 1 to 5 mm, and the suction pressure is preferably 10 to 70 kPa. The cleaning flow rate needs to be selected depending on the liquid composition of the coating liquid, but is preferably 100 to 500 cc / min. The cleaning liquid is preferably a coating liquid main solvent or a mixed solvent having a composition close to the coating liquid solvent composition.

  The position of the coating liquid suction port 38 relative to the edge of the web 40 varies depending on the diameter of the coating liquid suction port 38, the thickness of the thick coating, the amount of thick coating, etc., but the clearance with the web 40 is 0.2-2 mm. In this range, the horizontal distance from the end surface of the web 40 to the center of the coating liquid suction port 38 is preferably set in the range of 2 mm from the outer edge to 5 mm from the outer edge.

  Next, the configuration of the coating liquid suction apparatus 10 according to the embodiment of the present invention will be described.

  As shown in FIG. 2, a pass roller 41 around which a web 40 is wound is disposed in the vicinity of the coating liquid suction device 10, and the web 40 is continuously conveyed at a constant speed along the pass roller 41. Is done. The coating liquid suction device 10 includes a main body portion 42 and a coating liquid suction nozzle 14. The main body portion 42 includes a pedestal 44 and is fixed so as not to move. An XY table 46 is attached to the pedestal 44 and is movable with respect to the pedestal 44.

  Micrometers 48 are arranged on the XY table 46 along the X direction (the width direction of the web 40 to be transported) and the Y direction (the transport direction of the web 40 to be transported). The table 46 can be positioned accurately. Further, a nozzle fixing bracket 50 is fixed to the XY table 46 so that the coating liquid suction nozzle 14 can be fixed.

  Here, as shown in FIGS. 3A, 3B, and 4B, the coating liquid suction nozzle 14 includes a substantially cylindrical outer tube 52 fixed to the nozzle fixing bracket 50, and the outer tube. And a suction tube 54 that is detachably fixed to 52. The nozzle fixing bracket 50 is provided with a plate-like fixing wall 56, and an insertion hole 58 through which the outer tube 52 can be inserted is formed at the center of the fixing wall 56. The fixed wall 56 is formed with a notch 60 that communicates with the insertion hole 58 so that an elastic force can be obtained.

  A pair of fixing portions 62 project from the side wall 56A of the fixing wall 56 with the notch portion 60 therebetween, and a screw hole 62A is formed in the fixing portion 62 so that the fixing screw 64 can be screwed. The outer tube 52 is inserted into the insertion hole 58 and the fixing screw 64 is screwed into the screw hole 62 </ b> A, whereby the outer tube 52 is tightened and fixed to the fixing wall 56.

  On the other hand, a conical portion 66 is formed on one end side of the outer tube 52. A coating liquid suction port 38 is formed at the tip of the conical portion 66. As shown in FIG. 2, the coating liquid suction port 38 is formed at the edge of the coating surface 40A of the web 40 in a state where the relative position to the web 40 is determined. The surplus coating liquid disposed oppositely and applied to the coating surface 40A of the web 40 is sucked.

  In general, it is often necessary to suck the excess coating liquid in the vicinity of both ends of the web 40 in the width direction. Therefore, the coating liquid suction nozzle 14 is correspondingly disposed in the vicinity of both ends of the web 40 in the width direction. The

  As shown in FIG. 4B, a cleaning liquid supply port 68 is formed in the outer tube 52, and a substantially inverted letter-shaped channel 70 is formed in the cleaning liquid supply port 68. The flow path 70 is connected to the cleaning liquid stock tank 28 (see FIG. 1), and the cleaning liquid can flow into the outer tube 52 through the flow path 70.

  One end of a substantially cylindrical suction tube 54 can be inserted into the outer tube 52, one end of the suction tube 54 has a truncated cone shape, and the outer peripheral surface faces one end of the suction tube 54. A spiral groove 82 is formed. With the suction pipe 54 inserted into the outer pipe 52, the coating liquid suction port 38 of the outer pipe 52 is positioned on the same axis as the suction pipe 54, and the suction flow path 55 formed on the axis of the suction pipe 54. Communication is possible.

  An annular flange 72 projects from a substantially central portion in the axial direction of the suction pipe 54, has an outer diameter dimension substantially the same as the outer diameter dimension of the outer pipe 52, and can come into surface contact with the end surface of the outer pipe 52. Yes. The flange 72 is formed with screw holes 72A at a predetermined pitch along the circumferential direction, and the screw holes 52A are also formed on the end surface of the outer tube 52 corresponding to the screw holes 72A. The suction tube 54 is fixed to the outer tube 52 by screwing the fixing screws 74 into the screw holes 72A and 52A.

  Incidentally, a substantially cylindrical mounting portion 76 having a diameter slightly smaller than the inner diameter of the outer tube 52 is formed on the end surface of the flange 72 located on one end side of the suction tube 54. A mounting groove 78 is formed in the outer peripheral surface of the mounting portion 76 along the circumferential direction. A solvent-resistant O-ring 80 is mounted in the mounting groove 78, and the water tightness between the outer tube 52 and the suction tube 54 can be improved.

  The other end side of the suction pipe 54 is connected to the vacuum tank 16 (see FIG. 1) so that the inside of the suction pipe 54 has a negative pressure. The cleaning liquid flowing into the outer pipe 52 from the cleaning liquid supply port 68 is guided to one end of the suction pipe 54 through the groove 82.

  When the cleaning liquid reaches one end of the suction pipe 54, the cleaning liquid is sucked into the suction flow path 55 of the suction pipe 54 together with the excess coating liquid on the web 40 sucked through the coating liquid suction port 38 of the outer pipe 52. As described above, the concentration of the sucked coating liquid can be lowered by sucking the surplus coating liquid together with the cleaning liquid. It is also possible to flow only the cleaning liquid, clean the inner surface of the outer tube 52 with the cleaning liquid, and prevent the coating liquid from adhering between the outer tube 52 and the suction tube 54.

  Next, the operation of the coating liquid suction apparatus 10 according to the embodiment of the present invention will be described.

  As shown in FIGS. 4A and 4B, the coating liquid suction nozzle 14 is fixed to the outer tube 52 fixed to the nozzle fixing bracket 50 of the main body 42 of the coating solution suction device 10, and the outer tube 52. The suction tube 54 is detachably fixed.

  That is, since the suction tube 54 can be removed from the outer tube 52, it adheres to the coating liquid suction port 38 and the fixed matter fixed to the outer peripheral surface of the suction tube 54 (such as a solidified coating solution) or the suction tube 54. Fixed matter and the like can be easily washed.

  Further, when the coating liquid suction nozzle 14 is clogged, it is not necessary to remove the entire coating liquid suction nozzle 14 from the main body portion 42, and after removing the suction pipe 54 of the coating liquid suction nozzle 14 from the outer pipe 52, Since a new or already cleaned spare suction pipe 54 may be attached to the outer pipe 52, the time for stopping the coating liquid suction apparatus 10 can be greatly reduced.

  Here, when the entire coating liquid suction nozzle 14 can be attached to and detached from the main body portion 42, when the coating liquid suction nozzle 14 is installed in the main body portion 42 after cleaning the coating liquid suction nozzle 14, It is necessary to align the position of the coating liquid suction port 38. In this case, it is necessary to stop the application, measure the gap between the application liquid suction port 38 and the pass roller 41 that supports the web 40, and align the application liquid suction nozzle 14 again.

  However, in the present invention, the outer tube 52 is positioned with respect to the main body 42, and the suction tube 54 is attached to and detached from the outer tube 52, so that the relative positional relationship between the coating liquid suction port 38 and the web 40 is maintained. Will remain. Therefore, it is not necessary to align the coating liquid suction port 38 every time the coating liquid suction nozzle 14 is cleaned, and it is not necessary to stop the coating liquid suction apparatus 10 for a long time. For this reason, the productivity of the web 40 can be improved.

  By the way, since the suction pipe 54 has a smaller diameter than the outer pipe 52 and the coating liquid flows in the suction pipe 54, even if the suction pipe 54 is cleaned, the fixed matter due to the coating liquid is not completely removed. However, by making the suction tube 54 detachable from the outer tube 52, it is possible to replace only the suction tube 54, compared with the case where the entire coating liquid suction nozzle 14 is replaced. Thus, the running cost can be reduced.

  Also, by using a solvent-resistant O-ring 80 at the joint between the outer tube 52 and the suction tube 54, the space between the outer tube 52 and the suction tube 54 is sealed so that the cleaning liquid and coating liquid do not leak. . Moreover, since it is a solvent-resistant sealing material, it is possible to prevent the O-ring 80 from being deteriorated by the solvent.

  In addition, the kind of the coating liquid sucked by the coating liquid suction apparatus 10 of the present invention, the type of the web 40 as a coating object, and the use of the coating liquid suction apparatus 10 are not particularly limited, and are widely applied to the entire coating field. Is possible. That is, the coating liquid may be an organic solvent-based one or an aqueous one.

  Moreover, as a coating object, a resin-made thing etc. can be applied besides a metallic thing. The shape of the object to be coated is not limited to a web shape, but may be a sheet shape. The number of layers of the coating film formed by applying the coating liquid is not limited and may be one or more. As an example, the present invention can be applied to a case where a photosensitive solution applied to the surface of an aluminum web that is a support for a lithographic printing plate is sucked.

Further, the structure of the coating liquid suction nozzle 14 is not limited to the structure in which the cleaning liquid can flow into the outer tube 52 as described above, but the configuration in which the cleaning liquid flows can clean the inside of the suction pipe 54. Therefore, it is preferable.
<Example>
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to this Example.
1) Application conditions ・ Web thickness 0.3mm
・ Line speed 50m / min ・ Bar coating Coating liquid metering coating amount: 15cc / m ^{2 to} 40cc / m ²
・ Liquid viscosity 5-50mPa ・ s
・ Continuous application time 0.5-10 days 2) Comparative example

  Table 1 shows the results of comparison of cleaning methods and the like between the conventional coating liquid suction nozzle and the coating liquid suction nozzle of the present invention. As shown in Table 1, in the conventional coating liquid suction nozzle, the entire coating liquid suction nozzle is removed from the main body, and ultrasonic cleaning is performed for about 4 to 5 hours. Then, after cleaning, the cleaning liquid is circulated in the coating liquid suction nozzle.

  The cleaning effect is confirmed by nothing being discharged from the coating liquid suction nozzle, but since the cleaning effect is unclear, the coating liquid suction nozzle can be used several times continuously, regardless of the amount of fixed material. It becomes disposal. Further, when the removed coating liquid suction nozzle is attached to the main body, it is necessary to align the main body with the main body, which takes about 30 minutes to 1 hour.

  On the other hand, as shown in FIGS. 4A and 4B, in the coating liquid suction nozzle 14 of the present invention, the suction tube 54 is removed from the outer tube 52 fixed to the main body portion 42, and the fixed matter is rubbed. take. The time required for this was about 10 minutes.

  In addition, since it can be confirmed by visual observation that no adherent is adhered, the cleaning effect is clear, the occurrence of clogging can be prevented, and stable quality can be ensured. Furthermore, since the position of the outer tube 52 (coating liquid suction port 38) with respect to the main body portion 42 does not change, it is only necessary to attach the suction tube 54 to the outer tube 52, and it can be restored in about 5 minutes. Productivity is improved.

It is a schematic block diagram which shows the coating liquid suction system system of the coating liquid suction apparatus which concerns on embodiment of this invention. It is a schematic front view which shows the structure of the coating liquid suction apparatus which concerns on embodiment of this invention. (B) which shows the coating liquid suction nozzle which concerns on embodiment of this invention is a schematic front view, (A) is a left view of (B). (A) is sectional drawing which shows the state which attached the suction tube of the coating liquid suction nozzle which concerns on embodiment of this invention to the outer tube, (B) is the state which removed the suction tube from the outer tube. It is sectional drawing shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coating liquid suction apparatus 36 Coating liquid suction nozzle 38 Coating liquid suction port 42 Main body part 52 Outer pipe 54 Suction pipe 68 Cleaning liquid supply port 80 O-ring (solvent-resistant sealing material)

Claims (3)

A coating liquid suction nozzle that sucks the coating liquid applied to the application surface of the strip,
An outer tube formed with a coating liquid suction port for sucking the coating liquid and a cleaning liquid supply port to which the cleaning liquid is supplied;
A suction tube that is detachably inserted into the outer tube and sucks the coating liquid sucked from the coating liquid suction port and the cleaning liquid supplied from the cleaning liquid supply port;
A coating liquid suction nozzle comprising:   The coating liquid suction nozzle according to claim 1, wherein a solvent-resistant sealing material is used at a joint portion between the outer tube and the suction tube. A coating liquid suction device for sucking a coating liquid applied to a coating surface of a band-shaped object,
A coating liquid suction nozzle for sucking the coating liquid;
A main body portion that determines and holds a relative position between the coating liquid suction nozzle and the strip;
With
The coating liquid suction nozzle is
An outer tube in which a positioning liquid is positioned and fixed to the main body, and a coating liquid suction port for sucking the coating liquid and a cleaning liquid supply port to which the cleaning liquid is supplied;
A suction tube that is detachably inserted into the outer tube and sucks the coating liquid sucked from the coating liquid suction port and the cleaning liquid supplied from the cleaning liquid supply port;
A coating liquid suction device comprising:

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