JP2000345489A - Prevention of excessive sticking of paper to press roll of paper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method by which excessive sticking of a paper to a roll surface is prevented over a long period and both abrasion and fouling are prevented in a paper machine. SOLUTION: This method is to prevent excessive sticking of a paper 2 to the surface of a press roll 1 in the press roll 1 in a state thereof fed with the paper 2 by operation of a paper machine. The direct continuous feeding and application of a prescribed amount of a paper improver to the surface of the rotating press roll 1 are continued. A wax film can be formed and maintained on the surface of the press roll 1 to thereby prevent an excessive sticking phenomenon of the paper 2 to the utmost and further prevent the fouling or abrasion of the press roll 1. The quality of the produced paper 2 can resultantly be improved. Even the abrasion of a doctor blade attached to the press roll 1 is prevented to improve the durability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press roll used in a paper machine, and more particularly, to a method for preventing a paper from adhering to the surface of a press roll used in a paper machine.

[0002]

2. Description of the Related Art In a paper machine, a sheet-like wet paper is formed from raw materials, and water is removed from the wet paper to produce a product. To remove water, dehydration and drying are essential conditions. The extent to which the moisture of the wet paper can be dehydrated greatly affects the load on the subsequent drying process, that is, the amount of steam consumed in the dry part (energy cost). ing. In the press part of the paper machine, there are about 2 to 4 portions where paper (wet paper) is pressed against a pair of press rolls and felt and dewatered.

[0003] The wet paper and felt are sandwiched between the pair of press rolls in an overlapping state, and a nip pressure is applied between the rolls so that the moisture of the paper is transferred to the felt side and dehydrated. The press roll has a pair of two types, a roll in contact with the wet paper and a roll in contact with the felt.

Of these, a hard rubber roll or a natural stone or artificial stone roll (so-called stone roll) which is easy to adjust to the paper and has smoothness is used on the wet paper web side in order to emphasize the detachability of the paper. . In particular, with the speeding up of paper machines in recent years, ceramic artificial stone rolls, which are cheaper than stone rolls and make use of the properties of stone rolls, have come to be widely used.

(Over-adhesion phenomenon) By the way, the paper is supplied to the press roll by operating the paper machine. In the press roll in which the paper is supplied, the press roll as described above is used. When used, paper is a major problem in that the paper is over-adhered to its surface. Specifically, after passing through the nip point of the press roll of the pair of press rolls that is in contact with the paper, the paper immediately separates from the surface immediately after the nip point. However, a phenomenon occurs in which the paper is pulled and rotated while being attached to the surface.

FIG. 7 shows a position X in the press part where the paper excessively adheres to the press roll surface.
It is the figure which showed 1 and X2. FIG. 8 is an enlarged view of the over-adhesion phenomenon. The paper 2 adheres to the press roll surface and does not separate even after passing the normal ideal release point Q. The paper separation point P goes beyond that point. Therefore, when the paper 2 after leaving the press roller 1 is peeled off from the surface,
The tension (so-called “draw”) is generated by being pulled by the subsequent roller 1A.

The draw is preferably as small as possible, but tends to increase as the paper separation point P increases (as the peeling angle α increases), as shown in the figure. This is because the draw is balanced at the position of the paper separation point. When the draw is large, paper breakage is likely to occur, and the productivity is reduced. Even when the paper cannot be cut, there are many negative aspects in terms of quality, such as an increase in curl and a reduction in paper width.
In a paper machine aiming at high speed in recent years, since the wet paper web moves at a higher speed, it is necessary to raise the draw as it is. Therefore, it is an immediate task to reduce the draw, that is, to prevent the excessive adhesion phenomenon as much as possible.

(Contamination of contaminants) On the other hand, paper contains pitch, tar, fine fibers, adhesives from recovered waste paper, additives contained in various papers, fillers and other substances contained in the pulp raw material itself. It is contained. When the paper is pressed against the surface of the press roll with a large nip pressure during dehydration, such inclusions are in a state of heat generation under pressure and are likely to be adhered to the surface on the roll side and easily contaminated. Since the adhered substance has an action of stripping the fiber on the paper surface, it causes fluffing of the paper. When the stripped fiber grows greatly, an indentation is formed on the wet paper.

(Wearing) In order to remove the contaminants fixed on the press roll as described above, a method of scraping the contaminants with a doctor blade, which is an auxiliary device of the press roll, is generally used. . However, the roll surface is worn and further roughened by the pressure contact between the doctor blade and the press roll surface. Then, the contaminant enters the rough uneven portion and receives the pressure to be fixed. As a result, it must be scraped off again with a doctor blade, and the same phenomenon is repeated, resulting in a vicious cycle.

[0010] Under such circumstances, attempts have been made to solve the above drawbacks as much as possible. For example, in advance,
In some cases, a press roll whose surface is subjected to a contamination prevention treatment is used. However, the effect of preventing contamination decreases with the operation of the paper machine, resulting in a lack of durability. Also, for example,
Although there is a method of increasing the pressure of the doctor blade, the contaminants adhered to the surface can be easily removed, but if the doctor blade pressure is increased, the roll surface is increasingly worn, and the doctor blade is also greatly worn.

For this reason, the durability of the press roll and the doctor blade is reduced, and the replacement cycle (depending on the material of the doctor blade, especially in a recent high-speed paper machine, one to three days to one week).
Time, the doctor blade must be replaced. ) Is also shorter. Further, due to the setup work at the time of replacement, time loss is increased and production efficiency is deteriorated. This method of increasing the doctor blade pressure cannot significantly reduce (prevent) the excessive adhesion phenomenon.

On the other hand, for example, a water pond is formed on the doctor edge of the roll, and a water film is formed on the roll surface by using the water that penetrates therethrough, so that sticky substances such as pitch and fine fibers accumulate on the roll surface. There are ways to avoid that. However, the doctor blade pressure is inevitably weak in order to ensure the water dive, and the scraping action cannot be sufficiently exhibited. In other words, contaminants that once adhere to the surface are difficult to remove.

When contaminants penetrate the doctor blade, the blade may be temporarily lifted. As a result, a large amount of water overflows from the doctor blade and wets the paper, which reverses the role of the press part which should be dewatered. I do. Moreover, the quality of the paper is significantly poor unless it has a uniform water distribution in the traveling direction. In the future, if the recycling of waste paper progresses and the amount of sticky substances and fine fibers in the raw material increases, this will not always be a sufficient measure. As described above, the conventional countermeasures have advantages and disadvantages, and there has not been developed any one that reduces excessive adhesion of paper to the press roll surface and prevents both abrasion and contamination.

[0014]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems. That is, an object of the present invention is to provide a method for preventing over-adhesion of paper to the press roll surface for a long period of time in a paper machine and also preventing abrasion and contamination.

[0015]

Means for Solving the Problems Thus, the present inventors have conducted intensive studies on such problems, and as a result,
By continuing to supply a small amount of wax as if kneading it into the press roll, an extremely thin wax film can be constantly maintained on the surface, and this Watts film is effective in reducing excessive adhesion, preventing abrasion, and preventing contamination. And found that the present invention was completed based on this finding.

That is, the present invention relates to (1) a press roll in a state where paper is supplied by operation of a paper machine.
This is a method for preventing the paper from adhering to the surface, which is a method for preventing the paper from continuously adhering to the direct surface of the rotating press roll by continuously supplying a fixed amount of the paper release improving agent.

(2) A method for preventing excessive adhesion of a paper separation improver containing wax as a main component.

Also, (3) a method for preventing over-adhesion using a wax emulsified with a surfactant as a paper release improver.

Further, (4) a method for preventing excessive adhesion in which the melting point of wax used as a paper release improver is lower than the surface temperature of a press roll.

Further, (5) a method for preventing excessive adhesion in which the melting point of wax used as a paper release improver is 60 ° C. or less.

(6) The wax used as a paper release improver is paraffin wax, microcrystalline wax, petrolatum, synthetic wax, alkane pure product (C17-C27), α-olefin, alkene pure product (C19- C29), which is at least one method selected from the group of animal and plant glycerides.

Further, (7) the present invention resides in a method for preventing over-adhesion, which is provided by spraying the paper release improver on the surface of a press roll.

(8) A method of preventing excessive adhesion of paper on the surface of a press roll in a state where paper is supplied by operation of a paper machine, comprising: On the other hand, the present invention is directed to a method for preventing over-adhesion, in which a wax having a melting point lower than the surface temperature of the press roll is continuously supplied and supplied in an amount of 0.01 to 10 mg / m ² in terms of paper passing therethrough.

(9) A method for preventing excessive adhesion of paper on the surface of a press roll in a state where paper is supplied by operation of a paper machine, the method comprising the following steps 1) to 4): A method for preventing over-adhesion. 1. A step of supplying and applying wax directly to the surface of the rotating press roll. 2. A step of forming a wax film by melting the wax by further supplying and applying pressure to the press roll surface (wax film forming step); 3. A step in which the press roll and the paper are pressed against each other to transfer wax to the paper and wear the wax film layer (wax transfer step). 4. After the wax film has been worn, a step of filling the worn-out portion with the supplied wax (wax replenishing step).

[0025]

By continuously supplying and supplying a predetermined amount of wax to the surface of the press roll, the wax uniformly spreads over the surface of the press roll, and a wax film (layer) is formed. This wax film is extremely thin and highly releasable, and is stable even when paper (wet paper) is pressed against a press roll at high pressure. Even when a large nip pressure is applied,
It prevents sticky substances and fine fibers on the wet paper from sticking to the press roll.

Further, when the paper is peeled off from the press roll, a thin wax film for improving the releasability is interposed between the paper and the press roll. become. Then, the wax of the wax film on the press roll surface is transferred to the paper, and on the other hand, the wax is replenished even after the wax film has been worn.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments and drawings. Generally, a paper machine is provided with a dewatering part (press part). This part is a pickup that takes in paper (wet paper) from the wire, a felt that absorbs paper moisture, and a press that sandwiches this felt and paper at high pressure. Consists of rolls. FIG. 1 shows an example of a press part in the paper machine. The press roll 1 on the felt side includes a suction roll provided with a suction device and a grooved roll cut in a circumferential direction in order to promote the transfer of moisture from the felt 4. Also, it has already been mentioned that a hard rubber roll or a natural granite or artificial stone roll is used as a press roll for directly pressing the paper surface.

The method for preventing over-adhesion of the present invention is mainly applied to a press roll incorporated in this paper machine and directly pressing the surface of paper. In order to prevent the press roll from being contaminated, it is necessary to continuously supply and supply a constant amount of the paper release improver to the direct surface of the press roll. FIG. 2 is a part of the press part, and shows a position (position of the nozzle S) where the paper release improving agent is supplied.

As the paper release improver used in the present invention,
A wax having a low melting point of 25 to 60 ° C. is preferable as the melting point of the wax in consideration of the surface temperature of the normal press roll 1 in an operating state. The wax is selected from the group of, for example, paraffin wax, microcrystalline wax, petrolatum, synthetic wax, pure alkane (C17 to C27), α-olefin, pure alkene (C19 to C29), and animal and plant glycerides. One or more are used. The press roll 1 during the operation of the paper machine usually weighs 100 kg of paper.
Since a large linear pressure (nip pressure) of not less than / cm 2 is applied, a wax having a property that can maintain a stable wax film under this pressure, has releasability, and does not denature is preferable. By using a wax having a melting point lower than the surface temperature of the press roll 1, the wax receives the heat of the press roll and the nip pressure and can reliably fill the concave portions on the rough surface.

When a wax is supplied, a surfactant and water may be added to the wax to emulsify the water. In this state, the wax has a particle size of 0.1 μm to 1.0 μm, and when scattered, the wax easily enters the concave portion of the rough surface of the press roll. In addition, since the particles are fine, the surface area increases, and the particles are easily fused by the heat of the press roll. Here, the surfactant must not adversely affect the paper product and must not destroy the surface size or decolorize the paper fibers. Specific examples of the surfactant include polyoxyethylene alkyl ether and sorbitan fatty acid ester.

The mixing ratio of the surfactant may be the minimum amount necessary for emulsification, and 5 to 30% by weight based on the wax is employed. As a specific spraying method, a wax 50 may be appropriately used according to conditions such as paper quality and press roll.
Use a paper release enhancer with ~ 5000 times water.
The wax, which is solid particles at normal temperature, is sprayed on the surface of the press roll, and then melts due to the surface temperature (the temperature rises somewhat due to the frictional heat between the roll and the doctor or the heat transmitted through the felt) and becomes liquid. The melting point is preferably lower than the surface temperature of the press roll (for example, 70 ° C.). A spray nozzle is used to actually apply the wax to the surface of the press roll.

By the way, with respect to the supply amount of the wax which is the main component of the paper release improving agent, it is necessary to spray the wax little by little so as not to lose the wax film formed on the press roll surface. The supply amount of the wax component is
0.01 to 10 mg / m in terms of paper passing
² , preferably 0.05 to ² mg / m ² . If the supply amount is less than 0.01 mg / m ² , the wax film breaks and a uniform wax film cannot be formed, and if the supply amount exceeds 10 mg / m ² , the wax becomes excessively paper-free. , The printability of paper becomes poor. Here, a series of steps for applying a paper separation improver containing wax as a main component to the direct surface of the press roll will be described.

1) [Waxing Step] When a paper release improver containing wax W as a main component is supplied and applied to the cylindrical press roll 1, the other press rolls of the pair press the paper with the press roll via a felt. The wax W applied to the press roll receives pressure and adheres to the surface of the press roll (A), and fills the rough irregularities on the surface of the press roll. Fine particles (0.1μm)
When it is dispersed as (〜1.0 μm), it becomes easy to enter the uneven portion.

2) [Wax film forming step] The wax W adhered to the press roll surface by continuous supply of the wax forms a thin wax film (about several tens of microns) on the surface of the press roll 1 (B) supply The wax is melted by the surface heat of the press roll to form a liquid wax film. Wax is like this,
If the melting point is slightly higher than room temperature, that is, slightly lower than the surface temperature of the press roll, such a wax film can be formed.

3) [Wax transfer step] On the other hand, since the wax film formed on the surface of the press roll 1 is kept pressed against the supplied paper, the wax W is transferred to the paper little by little. (Transfer phenomenon) Therefore, the wax film formed on the press roll 1 gradually wears out.

4) [Wax replenishment step] However, since the wax W is still supplied to the press roll, the part which has been consumed and reduced is immediately replenished (D). The reduction and replenishment effects are not distinct, but are co-operative and simultaneous.

As described above, during the operation of the paper machine, if the wax is continuously supplied to the surface of the moving new press roll, the above steps 1) and 2) are carried out in the initial stage. Next, when the wax is continuously supplied, the above steps 3) to 4) are performed. Thus, the wax application step, the wax film forming step, the wax transfer step,
After going through each of the four steps of the wax replenishment step, the surface of the press roll is always in a state where a constant wax film is formed. In such a state, the releasability of the press roll surface is increased, so that the paper separation point is reduced and the draw is reduced. Therefore, over-adhesion is prevented.

Unlike the conventional case where the surface of the press roll has been subjected to a contamination prevention treatment in advance, the contamination prevention effect does not decrease with the operation of the paper machine. The effect can be maintained at all times. Since this wax film also functions as lubrication between the doctor blade and the press roll, wear of both the doctor blade and the press roll is suppressed. Therefore, the replacement cycle of the press roll and the doctor blade becomes longer. Further, since the wax film has good releasability, fixation of contaminants is prevented. Therefore, the surface of the press roll can always maintain smooth and high releasability.

Here, in the present invention, a method for supplying (specifically, spraying) the paper release improving agent to the press roll surface will be described for reference. 3 to 5 schematically show a method of spraying the paper release improver. FIG. 3 shows a state in which the paper separation improver is sprayed from a long spray nozzle. FIG. 4 shows a state in which the paper separation improver is sprayed from the spray nozzle (opposite type) of the chemical liquid ejecting apparatus toward the surface of the press roll. FIG. 5 shows a state in which the improver is sprayed, and FIG. 5 shows a state in which the paper release improver is sprayed from the movable spray nozzle.

FIG. 6 shows a chemical liquid ejecting apparatus used for spraying a paper release improver, which is a chemical liquid. This chemical liquid spraying device sprays the paper separation improver sent from the chemical liquid tank 10 from the spray nozzle S toward the press roll surface. If necessary, water is introduced via a flow meter 11 and mixed by a mixer 12 to simultaneously spray water with a spray nozzle S.
May be sprayed from. By changing the spraying nozzle, various spraying methods for the press roll can be selected. By the way, in the present invention, since the amount of wax to be sprayed is an important point, an experimental result of the spraying is shown.

[0041]

[Example 1] [Example 1] At the time of velvety multi-cylinder paper machine (Mitsubishi Heavy Industries) / newspaper making, a paper release enhancer was sprayed using a nozzle of a fixed type spraying device, after a doctor blade, and a press surface ( (Temperature: 75 ° C.) for one month. The paper release improver used here is a 10% emulsified aqueous solution mixed with a wax (paraffin wax, melting point 60 ° C.) and a surfactant at a weight ratio of 8: 2, and diluted with water 10 times. What was diluted 400 times on the surface of the press roll with a fixed type spraying device was sprayed at 2000 cc per minute (density 1 g / cc).

Therefore, the supply amount of the wax here is 2
000 g / min × 1/400 × 10/100 × 8/10 =
0.4g / min

The paper (newspaper) produced during that time was also inspected for printability and quality, but no effect was observed because the amount was as small as 0.2 mg / m ² .

Here, the amount of the wax sprayed is calculated on the basis of the passing paper (paper speed 1000 m / min, paper width 2 m, paper making amount 2000 m ² / min), and 0.4 g / min × 1/2000 m ² / min. ≒ 0.2mg / m
^Two

As a result, the paper separation from the press surface is improved, and the peeling point is from P to P as compared to before applying the present technology.
1 (see FIG. 8), moved down by 30 mm, the peel angle α decreased,
The draw was reduced from 1.8% to 1.7%. In addition, the amount of soil residue generated is from 320 g to 8 g per day, and the number of paper breaks is 8
From 5 times to 5 times. In addition, the doctor blade has been extended about two to three times in 96 to 210 hours due to reduced wear.

Example 2 At the time of forming a fourdrinier multi-cylinder paper machine (Kobayashi Seisakusho) cardboard base paper, a paper release improver was applied to the press surface after the doctor blade using the nozzle of the opposed type spraying device. A continuous spraying operation was performed for one month. The paper release improver used here was mixed with a wax (microcrystalline wax, melting point of 50 ° C.) and a surfactant in a weight ratio of 8: 2, and diluted with water five times.
% Emulsified aqueous solution. What was 400 times diluted on the surface of the press roll with a fixed sprayer, 2000cc per minute
(Density 1 g / cc).

Therefore, the supply amount of the wax here is 2000 g / min × 1/400 × 20/100 × 8/10
= 0.8 g / min

The printability and quality of the paper (base cardboard) produced during that time were also examined.
/ M ² · min.

The amount of wax applied was calculated based on the passing paper (paper speed 400 m / min, paper width 3.5 m, papermaking amount 14
00 m ² / min), 0.8 g / min × 1/1400 m ² /min≒0.6 mg / m
^Two

In this machine, the raw material is 100% of used paper, and the used paper also contains a large amount of gum pitch due to the recent 5 to 6 recycles. Met. However, as a result of applying the present technology, the paper separation from the press surface was improved, the peeling point was moved from P to P1 by 10 to 45 mm below, and the draw was reduced by 0.5%. As a result, the number of paper cuts decreased from 105 times to 65 times in the previous month, and productivity improved by 8.7%. The amount of dirt residue generated is 1
The daily consumption was reduced from 85 g to 12 g, the wear of the doctor blade was reduced by half, and the use time was doubled.

[Example 3] (When the amount of wax sprayed was changed to be increased) In Example 1, the amount of wax sprayed was changed to 1.0 mg / m2.
^The same treatment was performed except that the concentration was ² , 5.0 mg / m ² . The amount of generated dirt is 5 g at 1.0 mg / m ² ,
3 g at 5.0 mg / m ² , with a doctor life of 1.0
280 hours in the case of mg / m ^2, is a tendency to continue to improve and 320 hours in the case of 5.0mg / m ² was observed.

[Example 4] (Wax dispersion was reduced
In the case of Example 1, the amount of sprayed wax was 0.1 mg / m
^Two, 0.02 mg / m ^TwoPerform the same processing except
Was. Spray amount is 0.1mg / m^Two, 0.02mg / m
In this case, the amount of soil residue generated is 15 g, 50
g. The life of the doctor blade is 180 hours, 1
40 hours.

[Comparative Example 1] (Comparison with water) Under the same conditions as in Example 1, the spraying of the paper release improver was stopped, and only water was sprayed for one month. No effect of improving paper separation by water spraying was observed, and the peeling point returned (increased) to the state before wax spraying 12 minutes after the start of operation. However, the rise of the residue on the press surface decreased, and the amount of dirt residue was reduced to 160 g per day.
At the time of stoppage, the state of the press surface was observed, but the amount of deposits was smaller than when water was not sprayed. That is, it was confirmed that water spraying was effective in removing the residue. On the other hand, there was no effect of reducing the wear of the doctor blade, and the usable time limit was 96 hours.

[Comparative Example 2] (Comparison with high melting point wax) High melting point wax (melting point: 85 ° C) under the same conditions as in Example 1.
1 month after spraying the paper release improver. Since the wax melting point was higher than the press surface temperature, the wax particles did not dissolve and adhered to the surface as solid particles, the press surface became cloudy, and no effect of improving paper separation was observed.

The peeling point due to water spraying returned (up) to the point P1 before wax spraying 12 minutes after the start of operation. The amount of dirt residue generated was 170 g per day, and the state of the press surface was observed at the time of stoppage. However, the wear on the doctor blade was reduced and the use time was doubled.

Comparative Example 3 (Excessive Wax Supply) In Example 1, the amount of the applied wax was 20 mg / m ^2.
Other than the above, the same processing was performed. The amount of generated dirt is 3
g. Doctor life was also 320 hours. However, an excessive amount of wax applied to the paper surface causes a problem of lowering the fixing property of the ink in a later printing process.

[Comparative Example 4] (In the case where the amount of supplied wax is too small) In Example 1, the amount of the applied wax was 0.005 mg.
/ M ^2, and the same processing was performed. However, the stain residue generated at the doctor blade tip was not different from Comparative Example 1 (in the case of only water), and the life of the doctor blade was almost the same.

Although the present invention has been described above, the present invention is not limited only to the embodiments and the examples.
It goes without saying that various other modifications can be made without departing from the essence of the invention. For example, although the target of supply and supply of the paper release improver has been described as a press roll, the application destination is not limited to this, and a roll in which an excessive adhesion phenomenon occurs in direct contact with paper, for example, a guide roll It is of course possible to adapt to the above.

[0059]

According to the present invention, by constantly supplying a certain amount of paper release improver, a wax film is formed and maintained on the surface of the press roll, so that excessive adhesion of paper is prevented as much as possible, and contamination and wear of the press roll are prevented. Can be prevented, and the quality of the resulting paper can be improved. Further, wear of the doctor blade attached to the press roll is prevented, and durability is improved. As a result, the number of times of cleaning and replacing the press roll and the doctor blade is reduced, and maintenance is simplified.

[Brief description of the drawings]

FIG. 1 shows an example of a press part in a paper machine.

FIG. 2 is a part of a press part, showing a position where a paper release improver is supplied and supplied.

FIG. 3 is a diagram illustrating a spraying state by a long spray nozzle.

FIG. 4 is a diagram showing a spraying state by a facing spray nozzle.

FIG. 5 is a diagram illustrating a spraying state by a movable spray nozzle.

FIG. 6 shows a chemical liquid ejecting apparatus used for spraying a paper release improver.

FIG. 7 is a view showing positions X1 and X at which a paper excessively adheres to a press roll surface in a press part;
FIG.

FIG. 8 is an enlarged view of an over-adhesion phenomenon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press roll 1A ... Roll 2 ... Paper 3 ... Doctor blade 4 ... Felt 10 ... Chemical liquid tank 11 ... Flow meter 12 ... Mixer P ... Paper separation point P1 ... Paper separation point Q ... Ideal separation point S ... Injection nozzle

Claims (9)

[Claims] 1. A method for preventing paper from adhering to the surface of a press roll in a state in which paper is supplied by operation of a paper machine, comprising: A method for preventing over-adhesion, wherein the paper release improver is continuously supplied and applied. 2. The method for preventing excessive adhesion according to claim 1, wherein the paper separation improver is mainly composed of wax. 3. A paper emulsifier obtained by emulsifying a wax with a surfactant as a paper release improver.
The method for preventing overadhesion as described. 4. The method according to claim 2, wherein the melting point of the wax used as the paper separation improver is lower than the surface temperature of the press roll. 5. The method according to claim 2, wherein the melting point of the wax used as the paper separation improver is 60 ° C. or less. 6. The wax used as a paper release improver,
Paraffin wax, microcrystalline wax,
Vaseline, synthetic wax, pure alkane (C17-C2
7), α-olefin, alkene pure product (C19 to C2)
9) The method according to claim 2 or 3, wherein the method is one or more selected from the group of animal and plant glycerides. 7. The method for preventing excessive adhesion according to claim 1, wherein the paper separation improver is supplied by spraying onto the surface of a press roll. 8. A method for preventing excessive adhesion of paper on a surface of a press roll in a state where paper is supplied by operation of a paper machine, comprising: Of wax having a melting point lower than the surface temperature of
A method for preventing over-adhesion, characterized in that it is continuously supplied at 10 mg / m ² . 9. A method for preventing excessive adhesion of paper on the surface of a press roll to which paper is supplied by operation of a paper machine, comprising the following steps 1) to 4). Prevention method. 1. A step of supplying and applying wax directly to the surface of the rotating press roll. 2. A step of forming a wax film by melting the wax by further supplying and applying pressure to the press roll surface (wax film forming step); 3. A step in which the press roll and the paper are pressed against each other to transfer wax to the paper and wear the wax film layer (wax transfer step). 4. After the wax film has been worn, a step of filling the worn-out portion with the supplied wax (wax replenishing step).