JPH0737372U - Blade holder deflection correction device for blade coater - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the blade from being affected by the bending of the support beam. [Structure] A support beam is suspended horizontally between the upper ends of a pair of pressure arms 9 via a rotatable arm 8.
A blade holder 6 for holding the blade 5 is arranged on the support beam 7. A plurality of telescopic actuators are interposed between the blade holder 6 and the support beam 7. The strain sensor 19 is attached to the blade holder 6. A controller 20 for operating the expansion actuator based on the signal from the strain sensor 19 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blade holder deflection correcting device of a blade coater used when applying a coating liquid to a web such as a base paper produced in a paper mill to apply a coating.

[0002]

[Prior art]

 The base paper produced in the paper mill is often regarded as a processed paper as a product that meets the required purpose. Among the processed papers, the coated paper (coated paper) has a modified surface property. A blade coater is one of the coating machines used in this work, which is manufactured by the operation of applying a coating liquid on the surface of paper for the purpose of improving its performance.

As a blade coater, there is a blade coater whose example is shown in (a) and (b) of FIG. That is, the web 2 as the base paper is wound around the backing roll 1 and conveyed, and the coating liquid 4 can be supplied to the surface of the web 2 from below the backing roll 1 by the coating liquid supply device 3. is there. Further, in order to scrape off the surplus coating liquid supplied to form a coating liquid film having a required thickness on the surface of the web 2, the blade 5 is moved to the longitudinal direction of the backing roll 1 in the width direction of the web 2. The blade holder 6 holding the blade 5 is fixed horizontally on the support beam 7 arranged in parallel with the backing roll 1, and both ends of the support beam 7 are vertically arranged. Attached to the lower end of each arm 8 and the upper end of each arm 8 is attached to the upper end of a vertically opposed pressure arm 9 vertically extending so as to extend below the arm 8 via a shaft 10. It is rotatably suspended, and the lower end of each pressure arm 9 is rotatably supported by a fixed frame 12 via a shaft 11 parallel to the backing roll 1 and fixed to the pressure arm 9. Addition between the frame 12 and By the expansion / contraction operation of the cylinder 13, the pressing arm 9 can be tilted in the direction of contacting / separating with respect to the backing roll 1, and the pressing force of the blade 5 with respect to the web 2 can be adjusted. By the operation of the angle adjusting jack 15 interposed between the intermediate portion of the connecting beam 14 provided between the lower facing surfaces of the respective pressure arms 9 and the supporting beam 7, the arm 8 is moved around the shaft 10 as a fulcrum. The blade 5 can be rotated to adjust the contact angle of the blade 5 with respect to the web 2. Further, a profile adjusting device 16 having a width-direction divided structure is provided on the back surface of the blade 5 on the blade holder 6 so that the profile can be adjusted. By operating the file adjusting device 16, each part of the blade 5 in the width direction can be arbitrarily deformed so that the coating profile in the width direction can be freely adjusted.

[0004]

[Problems to be solved by the device]

 However, in the case of the above blade coater, when the width is wide (5000 mm or more), the supporting beam 7 is bent due to its own weight and pressing force, so that it is also supported by the blade holder 6 installed on the supporting beam 7. Bending force due to the bending of the beam 7 is given, which adversely affects the blade 5 that determines the thickness and profile of the coating liquid film. That is, when the support beam 7 is bent, its influence is exerted on the blade 5 via the blade holder 6, so that the delicate blade contact angle of the blade 5 with respect to the web 2 is greatly deviated at the end portion and the central portion. However, problems such as the occurrence of such problems will occur, and the coating profile in the width direction will not be uniform. Therefore, conventionally, the blade 5 is displaced by the operation of the profile adjusting device 16 to adjust the coating profile, but the operation of the profile adjusting device 16 is complicated and the quality accuracy in the width direction is improved. Will be difficult to put out.

In view of the above, the present invention provides a blade holder for a blade coater in which the deflection of the blade holder is corrected so that the blade is not affected by the deflection of the support beam, and the profile adjustment accuracy of the profile adjustment device is improved. It is intended to provide a deflection correction device.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has a pair of pressure arms which can be brought into and out of contact with a backing roll, and between the upper ends thereof, both ends of a support beam arranged in parallel with the backing roll are rotated via the arms. A blade holder that holds the blade is installed on the support beam, and the blade is pressed against the surface of the web wound around the backing roll to apply the coating on the surface of the web. Between the blade holder and the support beam of the blade coater, which is designed to scrape off the surplus of the working fluid, a telescopic actuator that is vertically expandable and retractable is installed in the direction parallel to the backing roll. The configuration is such that they are installed at intervals.

A strain sensor is attached to the blade holder at a position corresponding to each expansion / contraction actuator, and a controller is provided which sends a drive command to each expansion / contraction actuator based on a signal from the distortion sensor.

[0008]

[Action]

 When the support beam is deflected, the deflection is transmitted to the blade holder. At this time, when the telescopic actuator is actuated in response to the deflection, the blade holder is horizontally corrected so that the deflection becomes zero. Therefore, the blade is not affected by the bending of the support beam.

Further, if the deflection of the blade holder is detected by the strain sensor and the expansion / contraction actuator is operated by a command from the controller based on the detected value, the blade holder is automatically kept in a horizontal state. Become.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1A and 1B show an embodiment of the present invention, in which a pair of pressure arms 9 that can be brought into and out of contact with the backing roll 1 by tilting about the lower end as a fulcrum. Between the upper ends, both ends of a supporting beam 7 arranged parallel to the backing roll 1 are rotatably suspended via arms 8, respectively, and on the supporting beam 7, a blade 5 arranged in parallel with the backing roll 1 is provided. A blade holder 6 for holding the blade is installed, and the blade 5 is pressed against the surface of the web 2 wound around the backing roll 1 to scrape off the excess amount of the coating liquid 4 applied to the surface of the web. In the blade coater, between the blade holder 6 and the support beam 7, as a telescopic actuator, a jack 18 which is telescopically driven by a motor 17 is installed. The interposing installation is performed at a required arrangement interval in a direction parallel to the kicking roll 1. In addition, a controller 20 is attached to each of the jacks 18 of the blade holder 6 at a position corresponding to each of the jacks 18, and a controller 20 which sends a drive command to the motor 17 of each of the jacks 18 based on the signal of each of the strain sensors 19. Prepare

When the support beam 7 is bent due to its own weight or the like as shown in FIG. 2A, the effect of the bending is transmitted to the blade 5 via the jack 18 and the blade holder 6. At this time, each strain sensor 19 attached to the blade holder 6 detects the bending of each portion of the blade holder 6 in the longitudinal direction, and the signal is sent to the controller 20. The controller 20 issues a drive command to the motor 17 of each jack 18 based on the signal sent from each strain sensor 19 so that the deflection of the blade holder 6 becomes zero. As a result, the jacks 18 are expanded / contracted by the required amount from the controller 20. As a result, as shown in FIG. 2B, the bending of the blade holder 6 is corrected and held in the horizontal state. . Therefore, the blade 5 is not affected by the bending of the supporting beam 7.

Further, in the above, even if the bending amount of the support beam 7 is further changed by pressing the blade 5 or the like, the blade holder 6 can be automatically kept horizontal in the same manner as above. Therefore, the delicate blade contact angle of the blade 5 with respect to the web 2 is not disturbed by the influence of the bending of the support beam 7, and the coating profile adjustment by the profile adjustment device 16 can be performed accurately.

In the embodiment described above, the jack 18 as an expansion / contraction actuator is expanded / contracted based on a signal from the strain sensor 19 attached to the blade holder 6 to automatically correct the bending of the blade holder 6. However, the jack 18 may be expanded / contracted based on the signal from the coating amount, and a hydraulic cylinder or the like may be used as the expansion / contraction actuator. Of course, various changes can be made without departing from the scope of the present invention.

[0015]

[Effect of device]

 As described above, according to the blade holder deflection correcting device of the blade coater of the present invention, since the telescopic actuator is installed between the blade holder holding the blade and the support beam at a required interval, When the flexure occurs, the expansion / contraction of the expansion / contraction actuator can keep the blade holder horizontal, and can prevent the effect of the flexure of the support beam from affecting the blade. Not only can the frequency of operation of the profile adjustment device for adjusting the width of the blade be reduced, but the delicate blade contact angle of the blade can be made uniform in the width direction. It is also possible to attach a strain sensor to the blade holder and control it based on the signal of the strain sensor. By so operating the expansion actuators a command from over La, it is possible to automatically correct the deflection of even the blade holder deflection of the support beam is changed, exhibits an effect that.

[Brief description of drawings]

FIG. 1 shows an embodiment of a blade holder deflection correcting device of a blade coater of the present invention, (a) is a cut side view, and (b) is a view taken along the line AA of (a).

2A and 2B are diagrams showing an operating state, in which FIG. 2A is a schematic view showing a state before the deflection of the blade holder is corrected, and FIG. 2B is a schematic diagram showing a state after the deflection of the blade holder is corrected. .

FIG. 3 shows an example of a conventional blade coater,
(A) is a cutting side view, (B) is a BB arrow view of (A).

[Explanation of symbols]

 1 Backing Roll 2 Web 4 Coating Liquid 5 Blade 6 Blade Holder 7 Support Beam 8 Arm 9 Pressure Arm 18 Jack (Extension Actuator) 19 Strain Sensor 20 Controller

Claims (2)

[Scope of utility model registration request] 1. A support beam, which is arranged in parallel with the backing roll, is rotatably suspended between the upper ends of a pair of pressure arms that can be brought into and out of contact with the backing roll by means of the arms. On the support beam, install a blade holder to hold the blade, press the blade against the surface of the web wrapped around the backing roll to scrape off the excess coating liquid applied to the web surface. A blade coater characterized by having a structure in which an expansion / contraction actuator capable of expanding / contracting in a vertical direction is interposed between the blade holder and the support beam in a certain blade coater in a direction parallel to the backing roll at a required interval. Blade holder deflection correction device. 2. A blade according to claim 1, further comprising a strain sensor attached to a position corresponding to each expansion / contraction actuator of the blade holder, and a controller for sending a drive command to each expansion / contraction actuator based on a signal from each distortion sensor. Deflection correction device for blade holder of coater.