JP2001288689A - Doctor equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a doctor device suitable for doctoring a roll which is difficult to remove dirt or a resin coating roll which is easily scratched with a Teflon coating or the like. SOLUTION: The doctor device 1 includes a doctor blade 4 whose blade edge portion 3 is made of felt. The blade edge portion 3 of the doctor blade 4 is pressed against the outer peripheral surface 2a of the rotating roll 2 and slid in the direction of the roll rotation axis 2b at a predetermined speed. At the same time, water is supplied to the cutting edge portion 3.
Since the cutting edge portion 3 made of felt is provided, foreign matters can be scraped off without damaging the outer peripheral surface of the roll. By performing doctoring while supplying water to the felt cutting edge portion 3, foreign matters accumulated in the felt can be removed, so that the doctor cutting performance of the felt cutting edge portion 3 can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a Teflon (registered trademark) coating on the surface of a roll, which is difficult to remove dirt on the surface of the roll or which is scratched when doctoring with a metal blade. The present invention relates to a doctor device, a doctor blade, and a doctoring method using the doctor blade, which are suitable for doctoring a roll.

[0002]

2. Description of the Related Art Doctor devices are widely used for removing dirt such as foreign matters adhered to the surfaces of papermaking rolls, ironmaking rolls and the like. A doctor device having a typical configuration includes a doctor blade whose blade edge is pressed against an outer peripheral surface of a roll, a blade holder holding the doctor blade, and a doctor bag supporting the blade holder. By pressing the blade edge of the doctor blade at a fixed angle against the outer peripheral surface of the rotating roll at an appropriate angle, foreign substances attached to the outer peripheral surface of the rotating roll are scraped off by the doctor blade. Known doctor blades include those made of metal, those made of hard resin, those made of a composite material in which glass fiber is mixed with resin, and the like.

[0003]

Here, as a roll to be subjected to doctoring (to scrape off dirt such as foreign matters), a roll coated with a chemical such as paint is wrapped around a roll that is particularly difficult to remove dirt. Cylindrical dryers for drying are known. Further, as a roll whose outer peripheral surface is easily damaged, a roll (for example, a Teflon-coated cylindrical dryer) having an outer peripheral surface coated with a resin coating, for example, Teflon coating is known. It is convenient to use the doctor device having the above configuration for scraping off dirt such as foreign matter attached to the outer peripheral surface of these rolls.

However, in a cylindrical dryer for drying by bringing paper coated with a chemical such as a paint into contact, the paint or the like adheres to the outer peripheral surface of the roll and dries. Therefore, dirt is sufficiently removed by a metal doctor or the like. There is a problem that can not be. Furthermore, if the paint contains an adhesive, it is particularly difficult to remove stains. Further, in the case of a roll coated with a resin, there is a problem that the hardness of the outer peripheral surface is low and the surface is easily damaged when doctoring is performed with a commonly used doctor blade. In particular, when a metal doctor blade is used, there is a high risk of scratching the surface.

Conventionally, in the case of a cylinder dryer which is difficult to remove dirt, even if a conventional type of doctor is installed, dirt is not sufficiently removed. Manual work was required to wipe off the remaining foreign matter. Similarly, the removal of dirt such as foreign matter adhering to the surface of the resin coating roll cannot be performed using a conventional doctor device. In fact, they had to rely on manual wiping. However, there is a problem that the operation of manually wiping foreign matter is inefficient, and that foreign matter cannot be reliably removed. Furthermore, since it is necessary to stop the roll and wipe off the foreign matter, there is a disadvantage that the operation efficiency is reduced.

[0006] The object of the present invention is to solve the above problems.
An object of the present invention is to propose a cylinder dryer which is difficult to remove dirt because it is used for drying paper coated with a chemical such as a paint, and a doctor device and a doctor blade which are suitable for doctoring of a resin coating roll whose surface is easily damaged.

[0007]

In order to solve the above-mentioned problems, the present invention relates to a doctor apparatus having a doctor blade, a blade holder and a doctor back, which is used for scraping off dirt on a roll outer peripheral surface. The blade portion of the doctor blade pressed against the outer peripheral surface is made of felt.

The roll to be scraped off by the doctor device of the present invention is a cylindrical dryer for contacting and drying paper coated with a chemical such as paint, or a resin coating such as Teflon coating on the surface. There is a role.

Here, the doctor blade is attached to the blade core so as to cover a substantially rectangular blade core and a front end portion of the blade core from a surface portion of the blade core to a back surface portion through a front edge. In this case, the bent portion of the felt material functions as a cutting edge portion of the doctor blade.

[0010] In the doctor device for a resin-coated roll having this configuration, the outer peripheral surface of the roll is not damaged since the blade portion of the doctor blade is made of felt. Further, it was also confirmed that since there was no gap between the roll surface and the tip of the doctor blade and the contact was reliable, foreign substances could be efficiently scraped off from the outer peripheral surface of the roll.

If the foreign matter is scraped off by a felt doctor blade tip, the scraped foreign matter may accumulate in the felt. Therefore, the doctor device of the present invention, in addition to the above-described configuration, has a configuration in which water is supplied to supply water to the blade portion of the felt doctor blade in order to remove foreign matters accumulated in the felt. Is desirable. Water is supplied at a high temperature (for example, 100 ° C or higher) like a cylinder dryer.
In the doctoring of the roll, the blade contact portion also has a cooling function.

Next, it is preferable that the doctor device of the present invention is configured as a movable doctor device or a sliding doctor device because doctoring can be performed uniformly in the roll surface length direction. In this case, blade moving means for reciprocating the doctor blade along the roll outer peripheral surface in parallel with the roll rotation axis may be provided.

Further, the doctor device of the present invention can be configured to include the air tube type blade holder. In this case, the pressure contact force of the doctor blade against the roll surface can be adjusted by expansion and contraction of the air tube to which the air is applied.

On the other hand, the present invention relates to a doctor apparatus for a resin-coated roll used for doctoring a roll coated with a resin such as Teflon coating, wherein a cutting edge portion of a doctor blade pressed against the outer peripheral surface of the roll is provided. Is made of felt.

Also in this case, the doctor blade of the present invention is provided with the rectangular blade core and the blade so that the front end of the blade core covers the back surface through the front edge from the front surface of the blade core. It may be made of a rectangular felt material attached to a core material, and the bent portion of the felt material may be used as the blade edge of the doctor blade.

In the present invention, "felt" used at the tip of the doctor blade is used in a broad sense.
Wool or other animal hair as the main raw material, which is subjected to moisture, heat and pressure to produce fine fibers, and synthetic fibers such as nylon, acrylic, polypropylene, polyester, piniron, polyethylene, vinylon and rayon are entangled at high density by needle punching. So-called needle felt, which is a non-woven fabric
The nonwoven fabric includes a nonwoven fabric, a woven fabric mainly made of animal hair, and a woven fabric that is not animal hair but is mainly made of natural fibers or synthetic fibers. Among them, the felt with the needle felt is particularly excellent in terms of durability and the like, and can be suitably used.

Next, the present invention provides a doctoring method for scraping off dirt on the outer peripheral surface of a roll by using a doctor device, wherein a doctor blade having a cutting edge portion made of felt is pressed against the outer peripheral surface of the roll. Is moved along the outer peripheral surface of the roll in parallel with the roll rotation axis, and alternatively or alternatively, the scraping is performed while supplying water to the blade tip portion.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a doctor device for a resin coating roll to which the present invention is applied will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a doctor device of the present embodiment,
FIG. 2 is a schematic cross-sectional configuration diagram, and FIG. 3 is a diagram showing the doctor blade components.

First, referring to FIG. 1 and FIG. 2, the doctor device 1 of this embodiment is a movable or sliding doctor device, and the outer periphery of a resin coating roll 2 whose surface is coated with Teflon. The doctor ring is performed over the entire width of the roll outer peripheral surface 2a while reciprocating in the direction of the rotation axis 2b of the roll 2 along the surface 2a.

It should be noted that the doctor device 1 of this embodiment can also be suitably used for a cylindrical dryer having a metal surface for drying by bringing paper coated with a chemical such as paint into contact with the paper. It can be installed together with a fixed doctor device used for a shape dryer.

The doctor device 1 of the present embodiment has a doctor blade 4 having a blade edge portion 3 pressed against the outer peripheral surface 2a of a roll, a blade holder 5 holding the doctor blade 4, and a blade holder (blade). A linear motion mechanism 6 for reciprocating the holding device 5 in the direction of the roll rotation axis 2b (roll width direction), and a doctor back 7 supporting the linear motion mechanism 6 are provided.

A watering pipe 8 for watering the blade portion 3 is disposed above the blade portion 3 in parallel with the blade portion 3, and the watering pipe 8 is provided along the length direction thereof. The watering nozzles 8a are formed at regular intervals (the pipes 8 and the watering nozzles 8a are not shown in FIG. 1). Next, referring to FIGS. The structure of the doctor blade 4 which is a feature of the device 1 will be described. Doctor blade 4 of this example
Is provided with a rectangular blade core material 11 having a constant thickness as shown in FIG. A rectangular felt material 12 having a constant thickness, which is folded in two as shown in FIG. 3 (b), is attached to a front end portion (blade tip side portion) of the blade core material 11 from the front end edge 11a side. I have. In other words, the portion of the blade core material 11 on the front end side is separated from the front surface side by the front edge 1
It is covered with a felt material 12 over the back surface side via 1a. The bent portion 12 a of the folded felt material 12 is used as the cutting edge portion 3.

The felt used in the present embodiment is a needle felt (manufactured by Nippon Felt Kogyo Co., Ltd., model number GA3071) using synthetic fibers as a main raw material.

In this embodiment, the felt material 12 is fastened to the blade core material 11 using screws 13 and nuts 14 so that the felt material 12 attached to the blade core material 11 in the folded state does not come off. That is, as shown in FIG. 3A, three screw holes 12 (1) to 12 are formed at upper and lower end portions of the felt material 12 attached in a folded state and at substantially the center portion of the blade core material 11, respectively. (3),
12 (11) to 12 (13) and screw hole 11 (1)
To 11 (3) are formed at corresponding positions.
2 (c) are applied to the upper and lower surfaces of the folded felt material 12 respectively, and the lower felt pressing plate 16 is applied. 3 screw holes 15 drilled in
Screws 13 are screwed in from (1) to 15 (3), and the leg of each screw 13 is passed through the felt material 12 in a folded state, and each screw hole 16 (1) of the upper felt pressing plate 15 is screwed.
To 16 (3), and nuts 14 are respectively attached to the protruding portions.

The blade core 11 may be, for example, an epoxy resin plate having a thickness of 1.5 mm, a width of 150 mm, and a length of 74.5 mm.
It may be 10-15 mm thick, 170 mm wide, 65 mm-120 mm long (in the unfolded state). In this case, the felt material 12 becomes the blade core material 11.
At both ends, the felt material ends project laterally from both ends of the blade core 11. On the other hand, the felt holding plates 15 and 16 are, for example, 2 m thick.
m, 150 mm wide and 20 mm long epoxy resin plate. Obviously, each part of the doctor blade 2 of the present invention is not limited to such dimensions and materials.

Next, as the blade holder 5 holding the doctor blade 4, a well-known air tube type is used in this embodiment. This air tube type blade holder (blade holding device) 5 has a rectangular top plate 51, and blade fingers 52 are attached at regular intervals on the back surface thereof. The rear end portion 4 a of the doctor blade 4 can be detachably inserted into 53. In this example, the leaf springs 18, 1 are disposed between the rear end portion 4 a of the inserted doctor blade 4 and the top plate 51.
9 prevent the doctor blade 4 from coming off.

The blade fingers 52 are rotatably supported in the front-rear direction (the direction of arrow A) about the rotation shaft by a rotation shaft 55 bridged between support brackets 54 disposed at both ends. . The support bracket 54 is formed by erecting a part of both end edges of a bottom plate 56 arranged at a fixed distance from the blade finger 52 at a right angle.

Blade finger 52 and bottom plate 5
6, an opening air tube 57 and a pressurizing air tube 58 are respectively disposed before and after the rotating shaft 55. By controlling the supply and discharge of air to these air tubes 57 and 58, the doctor blade 4 can be separated from the roll outer peripheral surface 2a,
Also, the blade tip portion 3 of the doctor blade 4 is pressed with a predetermined pressing force.
Can be pressed against the roll outer peripheral surface 2a.

The linear motion mechanism 6 supporting the blade holder 5 includes a base 61 attached to the doctor back 7.
And a pair of linear slide rails 62 and 63 formed on the base 61 and extending in the roll width direction, and a slide table 64 that linearly reciprocates along the linear slide rails 62 and 63. Slide table 6
The back surface 4 is connected to a driving belt 65 such as a timing belt. The driving belt 65 includes a driving pulley 6 disposed at one end in the roll width direction.
6 and a driven pulley 67 disposed at the other end thereof so as to be parallel to the slide rail.

The drive pulley 66 is fixed to the output shaft of an AC servomotor 68 as a drive source. When the motor 68 is driven, the slide table 64 is linearly moved along the slide rails 62 and 63 by the drive belt 65. I do. If the motor 68 is reversed, the slide table 64 can be moved in the opposite direction. The moving range L (4) of the doctor blade 4 is the surface length L (2) of the roll 2.
The cutting edge 3 of the doctor blade 4 is set so as to be movable so as to include (the roll width, the length in the direction of the roll rotation axis 2b). The drive of the motor 68 may be controlled based on the output.

Next, the doctor back 7 supporting the linear motion mechanism 6 has support shafts 71, 72 at both ends thereof, and these support shafts 71, 72 are supported by bearings mounted on fixed frames 73, 74. It is supported in a rotatable state.

The thus configured doctor device 1 of this embodiment
Then, by controlling the amount of expansion and contraction of the pair of air tubes 57 and 58, the roll 2 rotating the felt cutting edge portion 3 of the doctor blade 4 with an appropriate pressing force.
To the outer peripheral surface 2a. As a result, doctoring of the roll outer peripheral surface 2a on which the Teflon coating is performed by the felt edge portion 3 is performed. Further, the doctor blade 4 performs doctoring over the entire outer peripheral surface of the roll while moving in the direction of the roll rotation axis 2b continuously or intermittently at a constant speed by the linear motion mechanism 6. Further, in this example, water is continuously or intermittently sprayed from the nozzle 8a to the felt edge portion 3.

Although the doctor device of this embodiment is of a movable type, the present invention is similarly applied to a general doctor device in which the doctor blade width is set to include the entire width of the roll to be doctored. It is possible.

[0035]

As described above, in the present invention, a doctor blade having a blade edge made of felt is used, and a cylindrical dryer or the like after coating with a chemical such as paint which is difficult to remove the surface stain is used. In addition, foreign matter can be scraped off from the roll outer peripheral surface without relying on humans and without damaging the roll outer peripheral surface by doctoring the outer peripheral surface of the resin-coated roll where the roll surface is easily damaged. In addition, it is possible to surely scrape off foreign matters which are hard to be removed by adhering to the surface.

In the present invention, while supplying water,
It is preferable to doctor the outer peripheral surface of the roll with a doctor blade having a blade edge made of felt. This makes it possible to easily discharge the foreign matter accumulated in the felt to the outside, and to maintain the doctoring performance of the felt blade portion in a favorable state. In addition, when used for a high-temperature roll such as a dryer roll, an effect of preventing heat generation can be expected by supplying water.

Further, in the present invention, it is preferable that the doctor blade is reciprocated along the rotation axis of the roll to perform doctoring. By doing so, even when there is a portion where the contact between the blade and the roll surface is not good, there is no portion where the dirt is not sufficiently scraped off, and the dirt on the outer peripheral surface of the roll is uniformly removed. Can be removed.

Further, in the present invention, it is preferable that an air tube type blade holding device is provided. Fine adjustment can be made by adjusting the pressing force of the doctor blade against the roll surface by the air pressure in the air tube. This is particularly effective for rolls that are easily damaged, such as resin-coated rolls.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a doctor device to which the present invention is applied.

FIG. 2 is a side view of the doctor device of FIG.

3A and 3B are diagrams showing components of a doctor blade in the doctor device of FIG. 1, wherein FIG. 3A is a plan view of a blade core material, FIG. 3B is a plan view of a state in which a felt material is spread on a plane, and FIG. () Is a plan view of the felt holding plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Doctor device 2 Roll 2a Roll outer surface with Teflon coating 2b Roll rotation axis 3 Teflon cutting edge portion 4 Doctor blade 4a Rear end portion of doctor blade 5 Blade holder (blade holding device) 6 Linear motion mechanism 7 Doctor back Reference Signs List 8 watering pipe (water supply means) 8a watering nozzle 11 blade core material 11a tip edge of blade core material 12 felt material 12a bent portion of felt material 13 screw 14 nut 15, 16 felt pressing plate 18, 19 leaf spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Fumiki Akakawa, Oji, Ebetsu, Hokkaido Oji Paper Co., Ltd., in Ebetsu Mill (72) Inventor, Masamitsu Watanabe, Oji, Ebetsu, Hokkaido, Oji Paper Co., Ltd., in Ebetsu Mill ( 72) Inventor Hiroshi Mayumi 1 Oji, Ebetsu-shi, Hokkaido Oji Paper Co., Ltd. F-term in Ebetsu Mill (reference) 4L055 CG23 FA20 FA30

Claims (8)

[Claims] 1. A doctor device having a doctor blade, a blade holder, and a doctor bag for scraping off dirt on the outer peripheral surface of a roll, wherein a blade edge portion of the doctor blade pressed against the outer peripheral surface of the roll is made of felt. A doctor device characterized in that: 2. The roll according to claim 1, wherein the roll on which the doctor device is installed is a cylindrical dryer for drying the paper coated with a chemical such as paint by contacting the roll, or a roll having a resin coating on the surface. A doctor device, characterized in that: 3. The doctor blade according to claim 1, wherein the doctor blade covers a substantially rectangular blade core material and a back surface portion of the blade core material at a front end portion from a front surface portion of the blade core material through a front edge. And a felt material attached to the blade core material, wherein a bent portion of the felt material is a blade edge portion of the doctor blade. 4. The doctor device according to claim 1, further comprising water supply means for supplying water to a blade portion of the felt doctor blade. 5. A blade moving means according to claim 1, wherein said doctor blade portion reciprocates along said roll outer peripheral surface in parallel with said roll rotation axis. A doctor device characterized in that: 6. The air tube according to claim 1, further comprising the air tube type blade holder, wherein the pressure contact force against the roll surface of the doctor blade is applied with air to expand and contract the air tube. A doctor device that can be adjusted by a doctor. 7. A doctor blade for use in the doctor device according to claim 1, wherein the blade portion of the doctor blade is made of felt. 8. A doctoring method for scraping dirt on a roll outer peripheral surface by using a doctor device, wherein a doctor blade made of felt is used as a blade portion pressed against the roll outer peripheral surface, and the doctor blade portion is moved to the roll outer peripheral surface. A doctoring method in which water is supplied to the blade tip portion together with or instead of being moved parallel to the roll rotation axis along the axis of the blade.