JP2001179687A - Paper powder reducing method for slitter blade in paper cutter and paper cutter having paper powder reducing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper powder reducing method for minimizing the genera tion of dust, particularly paper powder, during cutting while maintaining quality of a paper body in a paper cutter (slitter). SOLUTION: In this paper powder reducing method for slitter blades 1 and 2 in the paper cutter passing a paper 3 between the pair of slitter blades 1 and 2 for cutting them 0.02 to 0.5 cc/m2 of a lubricant is continuously sprayed on a blade tip part of a back side plane of the slitter blade at a flow velocity of 10 to 360 m/s for forming a thin film on a surface of the blade. By this, performance of the slitter blade, particularly the sharpness, is constantly maintained, friction with the paper body is reduced, and the production of the paper powder is minimized. Wear of the blade tip part is reduced and the sharpness is maintained, and as a result, service life of the blade is extended three to five times. Also, the paper body is provided with a sharp section and almost no soiling for enabling manufacturing of a high quality paper body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting apparatus (slitter) for reducing paper dust, and more particularly, to a paper cutting apparatus for cutting a sheet by passing paper between a pair of slitter blades. The present invention relates to a method for reducing paper dust.

[0002]

2. Description of the Related Art In recent years, the use of paper has been widely expanded, and paper materials having unprecedented functions have been developed. Accordingly, paper produced by a paper machine has also been diversified into, for example, white paperboard, cardboard base paper, printing paper, tissue, toilet paper, and the like, and various materials are provided on the market. In order to impart unique properties to each paper, various additives (such as clay) for improving the strength and whiteness of the paper are provided in addition to the fine fibers themselves, which are pulp raw materials.

[0003] By the way, paper (paper body) manufactured by a paper machine
Is appropriately cut by a paper cutting machine (slitter) so as to correspond to the final product. At this time, additives such as fine fibers and clay are generated as paper powder and additive powder due to cutting friction. These dusts are scattered by the rotating slitter blade and are a major cause of deteriorating the working environment. These dusts are generated more as the friction between the surface of the slitter and the paper increases. On the other hand, when a paper body is cut by a paper cutting machine (slitter), friction occurs between the two and the blade of the slitter is heated. It is well known that when a slitter blade is heated, its surface is further liable to wear and its sharpness is reduced.
In addition, the glue contained in the paper body adheres to the slitter blade due to heat, and this also increases as the friction on the surface of the slitter increases.

In order to solve these problems, conventionally,
Measures have been taken to frequently perform the periodic cleaning of the slitter blade or to shorten the interval of the slitter blade replacement period. However, time is lost, and the burden on costs is large. Therefore, it has been considered to use a slitter blade that has been subjected to a surface treatment. That is, a method of processing the slitter blade with a water-repellent or oil-repellent resin, for example, a tetrafluoroethylene resin, or a quenching process.

[0005] However, even if a slitter blade which has been subjected to such processing is employed, the effect is increased only in the initial stage, and the function immediately decreases during use. There is no difference at all. As another method, a method of removing dust has been devised.

For example, 1) There is a method in which dust is sucked by sucking the surface of the slitter blade. However, the suction force is limited, and the one that strongly adheres to the slitter blade is difficult to remove.

2) There is a method in which a brush or cloth is brought into close contact with the surface of the slitter blade to wipe off the paper dust. 3) A method of forming an oil film on the surface of a slitter blade by pressing a flexible member, such as a sponge, which has sufficiently absorbed oil or the like, in order to improve the slip (see, for example, Japanese Patent Application Laid-Open No. 6-800).
However, it cannot form an oil film uniformly and is not suitable for high-speed rotation. Further, the thickness of the oil film is increased, thereby soiling the paper body, and the paper powder generated when the paper is cut absorbs the oil and solidifies to adhere to a flexible member such as sponge.

The above-described method is not a fundamental solution for suppressing (reducing) the generation of paper dust while maintaining sufficient quality so as not to stain the paper body. . A method for reliably solving such a problem has not yet been developed.

[0009]

SUMMARY OF THE INVENTION The present invention is intended to solve these problems. That is, an object of the present invention is to provide a paper dust reducing method for minimizing the generation of dust at the time of cutting, particularly the generation of paper dust, while maintaining the quality of a paper body in a paper cutting machine (slitter). That is.
Another object of the present invention is to provide a paper cutting machine having a paper dust reducing function.

[0010]

Means for Solving the Problems The present inventors have conducted intensive studies on such problems, and as a result,
Surprisingly, a very small amount of lubricant was applied to the slitter blade,
In addition, it has been found that by continuously supplying the slitter blade, the sharpness of the slitter blade does not decrease and the paper body is not stained, and based on this finding, the present invention has been completed.

That is, the present invention relates to (1): a method for reducing paper dust of a slitter blade in a paper cutting machine for cutting paper by passing the paper between a pair of slitter blades, wherein the method is continuously constant with respect to the slitter blade. A method of reducing paper dust by spraying an amount of lubricant to form a thin film on the surface of the blade.

(2) When the spray amount of the lubricant is 0.0
(2) The method for reducing paper dust according to the above (1), wherein the amount is ² to 0.5 cc / m ² .

Further, (3) the paper dust reducing method according to (1), wherein the lubricant contains one kind selected from silicone oil, vegetable oil, mineral oil and synthetic oil or a combination thereof.

Further, (4) the paper dust reducing method according to the above (1), wherein the spraying of the lubricant is performed on the overlap at the cutting edge of the slitter blade.

[0015] (5) The method for reducing paper dust according to (1), wherein the spraying of the lubricant is performed at a flow rate of 10 to 360 m / sec.

(6) A method for reducing paper dust of a slitter blade in a paper cutting machine that cuts paper by passing the paper between a pair of slitter blades, wherein the method is continuous with a cutting edge of a flat surface on the back side of the slitter blade. Specifically, a method of reducing paper dust by spraying a lubricant of 0.02 to 0.5 cc / m ^{2 at} a flow rate of 10 to 360 m / sec to form a thin film on the surface of the blade is provided.

Further, (7) a paper cutting machine provided with a pair of upper and lower slitter blades and a drive unit for the slitter blades, wherein a spray nozzle for spraying a lubricant to a cutting edge of the slitter blade is provided. The paper cutting device has a paper dust reducing function.

Further, (8) the spray nozzle is provided in the paper cutting device having the paper dust reducing function of (7) above, which is opposed to the slitter blade surface at a distance of 2 to 20 mm.

Further, (9) the spray nozzle is provided in the paper cutting device having a paper dust reducing function of (7), which is capable of spraying at least at a flow rate of 10 to 360 m / sec.

The present invention can also adopt a configuration in which two or more selected from the above 1 to 6 are combined as long as this object is met. Similarly, a configuration in which two or more selected from the above 7 to 9 are combined can be adopted.

[0021]

The thin lubricant film is formed on the surface of the slitter blade by constantly spraying a very small amount of lubricant on the surface of the slitter blade in a constant amount. By the formed thin film, friction between the paper body and the slitter is reduced, wear on the surface is suppressed, and sharpness is maintained. As a result, the generation of paper dust is reduced as much as possible, and the paper itself is hardly stained.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments and the drawings. First, an outline of a paper cutting machine provided with a slitter blade to which the present invention is applied will be described.

FIG. 1 is a front view showing a paper cutting machine, and FIG. 2 is a side view thereof. The paper cutting machine A has a slitter blade 1,
2 and a driving unit 1A for supporting and rotating it
2A. That is, it includes a lower slitter blade 1 and a lower drive unit 1A that rotationally drives it, and an upper slitter blade 2 and an upper drive unit 2A that rotationally drives it.

Each of the upper and lower slitter blades is provided with a blade edge portion which is a peripherally cut (tapered) region. The lower slitter blade 1 and the upper slitter blade 2 are vertically arranged as a pair, and a part (for example, about 1 to 2 mm) of the cutting edge part overlaps and is in contact with each other so as to face each other. If the overlapping surface of the slitter blades is the back plane and the opposite side is the front surface, the lower slitter blade 1 and the upper slitter blade are in contact with each other on the back planes. Since the slitter blade is rotating, the overlapping portion is an area having a certain width on the rotation locus, which is referred to as an "overlapping area S" (see FIG. 4).

On the other hand, before and after the slitter blade of the paper cutting machine A,
A cradle 5 for supporting and guiding the transported paper body 3 is arranged. The paper body 3, for example, white paperboard, cardboard base paper, printing paper, tissue, toilet paper, etc. is transported while being mounted on the receiving table 5, and cut in the transport direction by the upper and lower slitter blades 1, 2.

Incidentally, the interval between the center axes of the slitter blades can be adjusted. The reason is that the slitter blade uses expensive SKD (die steel) as a material, and the blade portion is worn out and shortened when used for a long period of time. In this case, the slitter blade is used again after sharpening. For this reason, after resharpening, the diameter is slightly shortened, and the distance between the center axes of the two must be narrowed.

A spray nozzle 4 for spraying lubricating oil is disposed near the blade edge on the rear flat surface of the lower slitter blade 1. It is preferable that the spray nozzle 4 is opposed to the surface of the slitter blade at a distance of 2 to 20 mm near the cutting edge portion at the cutting position. If the distance is less than 2 mm, the paper powder may come into contact with the spray nozzle, and if the distance is more than 20 mm, the spray area is widened, and it is difficult to accurately and locally spray the blade tip. The specific attachment of the spray nozzle 4 is performed, for example, by fixing the spray nozzle 4 to a bracket 7 extending from the main body of the paper cutting machine. The position of the spray nozzle 4 is not limited as long as the spray nozzle 4 can be sprayed toward the overlapping area S of the cutting edge.

Here, a lubricating oil, which is a chemical solution, is supplied to the spray nozzle 4 from a tank (not shown), and is sprayed on the surface of the slitter blade along with an air flow. The injection nozzle 4 has an ability capable of sufficiently securing an injection flow rate of 10 to 360 m / sec, which will be described later. The control of the spray nozzle 4 is as follows.
This is performed by the spray nozzle control unit 8, and the spray amount of the chemical solution can be adjusted. The paper cutting machine of the present invention has been described above.

Next, a method for reducing paper dust of the slitter blade in the paper cutting machine according to the present invention will be described. FIG.
FIG. 1 is a schematic view showing a method for reducing paper dust of a slitter blade of the present invention. (A) is a front view (cover is omitted),
(B) shows a side view. The paper body 3 passes between the lower slitter blade 1 and the upper slitter blade 2, and is cut and supplied by the cutting edges of both slitter blades. A constant amount of lubricant is constantly sprayed from the spray nozzle 4 arranged near the cutting edge of the slitter blade 1 and applied to the cutting edge of the slitter blade.

The location of the spray nozzle 4 can be freely selected as long as the spray nozzle 4 can be sprayed toward the overlapping area S of the slit blades, as described above. By the way, as the slitter blade, a diameter of 20 to 30 cm is adopted,
The cutting edge has a width of about 10% of the radius. It is this part that contributes to the cutting of the slitter blade, so it is more efficient that the lubricant is sprayed intensively in this approximately 10% of the width area. It is good to spray into a region which is about 10% inward from the peripheral end.

In order to perform more efficient spraying,
What is necessary is just to spray toward the contact surface of the lower slitter blade 1 and the upper slitter blade 2. From the spray nozzle 4, a chemical solution, that is, a lubricant is sprayed on the air flow, and the spraying force surely attaches the lubricant to the surface of the slitter blade in an extremely thin layer. The air flow, that is, the flow rate of the spray is preferably performed at 10 to 360 m / sec. If the flow velocity of the injection is less than 10 m / sec, the slitter blade 1 loses the flow of the air during the normal rotation, and a complete thin film on the surface of the slitter blade cannot be expected sufficiently. On the other hand, if the flow velocity is higher than 360 m / sec, it becomes physically difficult to inject. In the present invention, when the lubricant is sprayed and adheres to the surface of the rotating slitter blade, even by centrifugal force,
It is also an advantage that an extremely thin film can be formed on the cutting edge more effectively because the attached lubricant is spread in the radial direction.

Further, the paper powder can be immediately blown off from the slitter blade by utilizing the flow velocity of the spray nozzle 4.
In this case, if the spray nozzle 4 is arranged toward the cutting edge of the cutting position, paper dust generated during cutting can be immediately blown off from the cutting edge. Unlike the blowing of strong compressed air, the blowing by the spray nozzle 4 functions as a secondary effect of chemical liquid spraying, and the spraying is performed so widely that the working environment is adversely affected. There is no. That is, there is an effect that the slitter blade is separated only from the cutting edge without polluting the environment.

As the lubricant to be sprayed, one kind selected from silicone oil, vegetable oil, mineral oil, synthetic oil and the like, or a combination thereof is used. A very small amount of lubricant is continuously sprayed onto the rotating slitter blade for a certain period of time. for that reason,
At all times, a very thin film of a certain thickness is formed on the slitter blade surface, and the performance of the slitter blade edge,
That is, the sharpness is always maintained.

That is, since the thin film of the lubricant minimizes the friction between the paper body and the slitter blade as much as possible, in the paper cutting machine of the present invention, the generation of paper dust itself is suppressed as low as possible. Wear of the blade tip itself is suppressed. Therefore, heating due to frictional heat is also prevented, and
It should be noted that the spray from the spray nozzle, combined with the cooling effect of the cutting edge, has the advantage of extending the life as a slitter blade. Further, since the spray amount of the lubricant is very small, the amount of the lubricant carried away by the paper body is extremely small, and the paper body is hardly contaminated and high quality is maintained.

In the present invention, from the viewpoint of reduction of frictional force and contamination of paper, the spray amount of the lubricant, which is a chemical to be sprayed, is preferably about 0.02 to 0.5 cc / m ^2. Preferably, it is about 0.03 cc / m ² . When the amount is less than 0.02 cc / m ² , the thin film is not formed uniformly and the film is cut, so that the performance of the cutting edge of the slitter blade cannot be sufficiently maintained. If it is larger than 0.5 cc / m ² , the effect tends to be saturated.

Incidentally, the diameter of the slitter blade used is usually 20 to 40 cm, and the rotation speed of the slitter blade is from low speed rotation (320 rpm) to high speed rotation (3 rpm).
200 rpm) (200 m to 300 m in paper speed)
0 m / min). Also, the range of the cutting edge is usually 3 to 5 mm inward from the cutting edge. Next, an example is shown, but the present invention is not necessarily limited to this example.

[Embodiment] Of the upper slitter blade and the lower slitter blade used in a sheet cutter (manufactured by Mitsubishi Corp., automatic slitter scorer), a spray nozzle for spraying a chemical solution toward the blade edge of the lower slitter blade is used. I set it. The installation position of the spray nozzle was attached to the bracket 7 extended from the sheet cutter and was near the cut portion of the rear flat surface of the lower slitter blade. Then, the spray nozzle was arranged with respect to the blade edge portion in the direction of transport of the paper body. Then, the paperboard was supplied to a sheet cutter, and continuous cutting was performed between the upper and lower slitter blades. At that time, 0.03 cc of lubricant (here, silicone oil) was applied to the cutting edge of the rotating lower slitter blade (new).
/ M ² continued to be sprayed. The spray velocity is 120 m /
Seconds.

The results of the operation for 48 hours are as follows. 1. Almost no paper dust was generated. 2. At the time of cutting, almost no paper dust adhered to the cutting edge of each slitter blade, and the cutting edge was always new. 3. The cut edge of the paper was extremely sharp. 4. No contamination of the cut paper is visible.

[Comparative Example] A similar experiment was performed as in the Example, except that the chemical solution was not sprayed at all by the spray nozzle. Driving 4
The results obtained after 8 hours are as follows. 1. Extremely high generation of paper dust. 2. At the time of cutting, a large amount of paper powder adheres to the cutting edge of each slitter blade. 3. The cut end of the paper body was in a state where fluff was seen. 4. Dirt was visible on the cut paper body.

Although the present invention has been described above, it is needless to say that the present invention is not limited to the embodiments, and that various other modifications are possible without departing from the essence thereof. For example, a plurality of spray nozzles can be provided for the slitter blade. Also,
As a paper cutting machine, any machine having a different function may be used as long as it has a slitter blade. Further, as the paper cutting machine, any rotation direction of the slitter blade with respect to the paper body can be adopted. In addition, although lubricating oil was used as a drug, the inventor has confirmed that a surfactant is also effective. Further, although the target of cutting is shown as an example of a paper body, in the case where dust of the material to be cut is generated at the time of cutting, the present invention can be applied to a plastic plate other than the paper body.

[0041]

According to the present invention, by continuously supplying the lubricant to the surface of the slitter blade at a constant rate, a thin film of the lubricant is formed on the slitter blade. The performance of the slitter blade, particularly the sharpness, is always maintained, the friction with the paper body is reduced, and the generation of paper dust is reduced as much as possible. The wear of the cutting edge is reduced, the sharpness is maintained, and as a result, the life of the blade is extended 3 to 5 times. Also, the cut edge of the paper body is sharp and there is almost no dirt on the paper body,
High quality paper can be manufactured.

[Brief description of the drawings]

FIG. 1 is a front view showing a paper cutting machine.

FIG. 2 is a side view showing a paper cutting machine.

FIGS. 3A and 3B are schematic diagrams showing a method for reducing paper dust of a slitter blade according to the present invention, wherein FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a diagram showing an overlapping area S in the slitter blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower slitter blade 1A drive part 2 Upper slitter blade 2A drive part 3 Paper (paper body) 4 Spray nozzle 5 Receiving stand 6 Cover body 7 Bracket 8 Injection nozzle control part

Claims (9)

[Claims] 1. A method for reducing paper dust of a slitter blade in a paper cutting machine for cutting paper by passing paper between a pair of slitter blades, wherein a predetermined amount of lubricant is continuously sprayed on the slitter blade. A method for reducing paper dust, comprising forming a thin film on the surface of a blade. 2. The spray amount of the lubricant is 0.02 to 0.5 cc.
/ M ^{2. The} method for reducing paper dust according to claim 1, wherein 3. The method according to claim 1, wherein the lubricant is silicone oil, vegetable oil, mineral oil,
The method for reducing paper dust according to claim 1, wherein the method comprises one kind selected from synthetic oils or a combination thereof. 4. The paper dust reducing method according to claim 1, wherein the spraying of the lubricant is performed on the overlap at the cutting edge of the slitter blade. 5. The spray of the lubricant is performed at a flow rate of 10 to 360 m /
The method according to claim 1, wherein the method is performed in seconds. 6. A method for reducing paper dust of a slitter blade in a paper cutting machine which cuts a sheet by passing paper between a pair of slitter blades, wherein a cutting edge of a flat surface on the back side of the slitter blade is continuously reduced by 0.02. 0.5 to 0.5 cc / m ² of lubricant at a flow rate of 10 to 36.
A method for reducing paper dust, comprising spraying at 0 m / sec to form a thin film on the surface of the blade. 7. A paper cutting machine provided with a pair of upper and lower slitter blades and a drive unit thereof, wherein a spray nozzle for spraying a lubricant to a cutting edge of the slitter blade is arranged. A paper cutting device having a paper dust reducing function. 8. The spray nozzle is located at a distance of 2 to 2 from the slitter blade surface.
8. The device according to claim 7, wherein the device is opposed to a distance of 20 mm.
A paper cutting device having the paper dust reducing function described in the above. 9. The spray nozzle has a flow rate of at least 10 to 3
8. The paper cutting device having a paper dust reducing function according to claim 7, wherein spraying at 60 m / sec is possible.