KR19990044688A - Treatment method in paper machine - Google Patents

Abstract

The present invention relates to a method of processing in a paper machine in connection with a moving member such as a cylinder, roll, felt or wire in contact with the paper web to be produced. The condition is to expose the material in the paper web which tends to adhere to the moving member during the papermaking process and impair its operability. The composition is applied, for example, by a nozzle 4 to a moving member, such as the central roll 1 in the compressed portion. The composition, such as furnishing with the addition of a possible exfoliating chemical, is selected from at least one material in such a way as to act on the at least one substance which is bonded by a chemical process to the moving member such as the central roll 1 from the paper web 6 Contains enzymes. The purpose of the chemical process is to peel and / or decompose the at least one adhesive material from the moving member, ie the central roll 1.

Description

Treatment method in paper machine

The present invention relates to a moving member, such as a cylinder, roll, felt, or wire, which is in contact with a paper web to be produced in a state in which the moving member is adhered to the moving member and is exposed to a material in the paper web that can impair its operation in the papermaking process. It relates to a treatment method in a paper machine related to.

Paper machines are currently used at high operating speeds. In view of the controllability of the papermaking method, an important factor is to maintain the reliability of the moving member in papermaking machines such as cylinders, rolls, felts and wires. In addition to maintaining reliability, another important factor is to improve the operability of the moving member, in particular the central roll of the crimped part, thereby increasing the speed of the papermaking process. Paper machines include many moving members that come into contact with the paper web at various stages of the papermaking process in such a way that the material is peeled off from the paper web in an unregulated manner and adheres to the moving member. Such materials include wood components, coatings such as latex, starch and carboxymethyl cellulose (CMC). If these materials become adhered to the moving member, they may cause problems in the above stages of the papermaking process with long term operation, and worst of all, may cause the destruction of the paper web.

In the following specification, some members of the paper machine are described, and the problems that arise when the above-mentioned materials adhere to these members from the paper web are described. First of all, the material adhering to the felt will lower the dewatering ability of the felt, thus causing problems in operability. It is also evident that the felt change will always cause an interruption, and if such a change cannot occur concurrently with other maintenance operations, if the felt's dehydration capacity is too low, the paper web will break and always incur significant costs. . Similar problems also apply to wires. Their dewatering capacity will be impaired, which not only contaminates the machine, but can also destroy the paper web. For drying cylinders, contamination is a problem that reduces the workability of the process and causes the need for cleaning. In addition, the material peeling off the paper web and adhering to the drying wire reduces the drying capacity if the drying wire is contaminated. A particularly difficult problem arises in the pressing part of the paper machine when the paper web is peeled off from the central roll of the pressing part. At this time, the paper web first enters the papermaking process when the paper web moves from the central roll of the compressed portion to the stretching roll without the support. If the draw ratio is to be increased due to the holding force on the paper web by the adhesive material, the paper web is exposed to an exponentially increasing load. In particular, when using a high speed paper machine, and when the working speed of the papermaking process increases, the paper web is peeled from the central roll of the most critical crimped part for the reasons mentioned above. The material from the paper web adhering to the surface of the central roll prevents, in this critical step, the paper web from peeling off in an optimal manner from the surface of the central roll following the pressing nip. Therefore, the paper web must be subjected to a tensile load and allow for initial peeling. This tensile load is for the paper web in an exponentially increasing manner. Since the tension of the paper web is proportional to its breaking susceptibility, peeling of the paper web from the central roll is the most critical step. Naturally, in the pressed portion of the paper machine currently in use, for example, by a doctor blade positioned against the central roll after the peeling point of the paper web, as well as fluid, i.e. pure water or various peeling chemistries, on the outer surface of the IRA central roll. By spraying water with the substance, an attempt is made to prevent contamination of the central roll. By this method, the condition can be improved to such a degree that most of the material from the paper web adhering to the surface of the central roll can be removed. However, such treatment with doctor blades and chemicals is not sufficient because a colloidal film layer is formed on the outer surface of the central roll that is resistant to the cleaning effects of the peeling chemicals and doctor blades.

In addition, similar problems in other parts of the paper machine will be apparent to those skilled in the art when the material peeled from the paper web adheres to the moving member and causes the moving member to contact the paper web in a manner that impairs the operability of the paper machine. Become. In this regard, the crimped part and in particular its central roll are the most critical of the paper machine, as described above, since it is for the paper web when the most critical load in the manufacturing process is peeled off from the center roll of the crimped part. It is regarded as an integral part.

It is an object of the present invention to solve the above-mentioned problems associated with the papermaking process to a large extent and to improve the present technology. A further object is to enable the use of higher operating speeds in the papermaking process and at the same time ensure the continuity of the papermaking process. In order to achieve the above object, the process according to the present invention mainly comprises a chemical process for peeling and / or dissolving at least one adhesive material from the moving member to maintain and / or improve the reliability of the moving member in the papermaking process. A composition comprising at least one enzyme suitable for acting on at least one substance that is peeled off from the paper web and adheres to the transfer member is applied to the transfer member.

As a result, the present invention allows the enzyme to be transferred to the moving part and the effective enzyme can be applied to the material capable of acting on the material present in the moving member by the above chemical process in which the adhesive action is removed, and the material is decomposed or modified. To a surprising discovery that it can be removed from its connection with a moving member.

The method according to the invention provides the advantage that the adhesive material can be affected separately. Suitable enzyme compositions can be selected from well known enzymes based on the mechanism of action for each type of adhesive material to achieve the above-mentioned objects. Thus, according to an advantageous embodiment of the process according to the invention, the adhesive material is selected from wood cellulose, such as cellulose, hemicellulose, pectin, extracts, proteins, lignin or lignans, coatings such as latex, starch and carboxycellulose (CMC). It can be seen that it can include more than one material and can be selected to add a material based on the type of material that can or can adhere to the moving member.

In addition, some advantageous aspects of the invention are provided in the remaining claims.

In the following description, the invention will be explained in more detail with reference to the accompanying drawings and examples.

1 is a schematic side view of an apparatus according to the invention in the compressed part of a paper machine.

FIG. 2 is a schematic enlarged partial view of point I in FIG. 1.

3 is a graph showing the results of a test performed according to Example 5. FIG.

With reference to FIG. 1, after the second pressing nip 2 of the paper machine's central roll 1, in front of the doctor blade 3 in the direction of rotation of the crimping roll (arrow PS), the fluid composition is applied to the joule structure ( 4) or the like to spray the outer surface of the central roll (1). The composition comprises at least one enzyme selected according to the basic idea of the present invention. One or more such enzymes act on the colloidal layer on the outer surface of the central roll 1. The enzyme penetrates the colloidal layer and induces a chemical reaction according to the invention in the colloidal layer, which is formed substantially on the outer surface of the central roll 1, peeled off from the paper web 6 and the central roll 1. Thin or even completely remove the colloidal layer that adheres to the outer surface of the film. The composition sprayed on the outer surface of the central roll 1 may also naturally contain chemicals that act on the macroscopic layer that is removed using a doctor blade. The application point can be located after the doctor blade 3 because the time of action required by the enzyme corresponds to several rotation periods and in this regard the distance between the application point and the doctor blade is not significant.

FIG. 2 shows that cleaning of the surface of the central roll 1 can substantially reduce the adhesion of the paper web 6 on the outer surface of the central roll 1, with the paper roll of the central roll closer to the ideal tangential position. The dashed line 5 schematically shows the effect to be achieved by the method according to the invention leading to the peeling off from the outer surface. This initial delamination of the paper web 6 reduces the draw ratio, i.e. the difference in the peripheral speed between the center roll 1 and the draw roll 7, thereby substantially reducing the tension of the paper web and the risk of breaking the paper web. And / or maintain the same draw ratio without enzyme treatment while increasing the operating speed of the paper machine. In this way, by applying the method according to the invention, better reliability of the crimped part in terms of continuous operation and / or higher operating speed is achieved with the papermaking process.

Corresponding action can also be achieved with less critical moving members in papermaking processes such as wire, felt, etc., so that the composition comprising the enzyme applied on the moving member is carried by the moving member and generates a desired chemical reaction to move it. It is apparent to those skilled in the art that the member is cleaned to maintain its operability. It is also clear that the enzyme may be brought into contact with the moving member in any suitable manner applicable to the paper machine. Enzymes can also be recovered and recycled during the process.

In the following, it contributes to the decomposition or modification of the material adhering to the moving member such as the center roll 1, the cylinder, the felt, the wire, and the like, and the operability of the papermaking process, for example, the peeling of the paper web from the center roll at the crimped portion. Enhancing enzymes will be described.

Enzymes that degrade and modify cellulose, such as endoglucanases, cellobiohydrolases and β-glucosidases,

Enzymes that degrade and modify wood hemicellulose polymers, such as xylan, mannan and arabinogalactan, including xylanase, mannaase, β-xylosidase and β-mannosidase, and the aforementioned Enzymes that break down the side chain groups of the polymer,

Enzymes that break down and modify wood extracts, in particular lipase hydrolyzed triglycerides,

Pectinase enzymes that degrade wood pectin polymers,

Proteases that degrade wood proteins,

Redox enzymes that act on wood lignin and lignans, including peroxidases and phenol oxidases, in particular laccases, used alone or in combination with low molecular weight organic or inorganic cofactors and mediators,

Enzymes that break down starches such as amylases.

In the examples which follow, the method according to the invention will be illustrated by a series of examples describing laboratory tests, pilot tests and mill grinding tests. Laboratory tests are the most extensive, and these tests serve to illustrate the applicability of the invention by various enzymes. The pilot test series further characterizes the applicability of the method according to the invention. The mill grinding test also shows the applicability of the method on a large scale. These examples serve to illustrate the invention and are not intended to limit the invention.

Example 1

Laboratory studies were conducted to test the effect of enzymatic treatment of the roll surface of the paper machine on peeling of the web.

Using a laboratory apparatus designed for this purpose, the peel tension of the web before and after enzymatic treatment of the roll surface was measured.

Laboratory sheets were prepared from a mixture of debonding pulp (DIP) and thermodynamic pulp (TMP).

DIP 50%

Unbleached Thermodynamic Pulp 50%

Grammage 56 g / m ²

42% after drying material pressing

pH 7.0 (unregulated)

The sheet was pressed against the surface of a Volrok compression roll, generally known in the papermaking art, in two steps under a pressure of 2.2 MPa with exchange of dry sheets sandwiched therebetween. The pressing time is 1 minute each.

The enzyme mixture used is an enzyme sold under the tradename PERGALASE A40. Pagalase A40 is an enzyme mixture that is a product of Genencor, which contains Trichoderma reesei cellulase and hemicellulase, which can hydrolyze colloidal carbohydrates on the surface of a central roll. The pergalase A40 product contains about 2700 cellulose units per ml. Measurement of cellulose activity is based on enzymatic hydrolysis of carboxymethyl cellulose (CMC) in 0.05M sodium acetate buffer at about 50 ° C. and pH 4.8. One active unit refers to the amount of enzyme that, as calculated by glucose, releases one micromole of reducing sugar from the substrate in one minute. Reducing sugars were measured by dinitrosalicylic acid (DNS).

For enzymatic treatment, a buildup was created on the surface of the Volokroll by successively passing ten sheets to the surface without washing the intervening surface.

Enzyme treatment was carried out by maintaining the surface of the Volokoul for 1.0 h in a solution containing 1.0% of pergalase A40 at a temperature of 50 ° C.

Peel tension (N / m) was measured according to the UPM-Kymmene / PHORD method.

Result: Peel Tension (N / m)

DIP / TMP Pulp:

Before enzyme treatment

Sheet 1 1.41

Sheet 4 1.45

Sheet 10 1.45

After enzyme treatment

Sheet 1 0.90

Sheet 2 1.18

Sheet 3 1.41

These preliminary tests showed a clear reduction in peel tension. Peeling of the web from the roll surface is easier and the peel value is clearly reduced.

Example 2

This example shows the effect of various enzyme preparations on the peeling properties of the paper web. All enzyme preparation is, WO95 / 30 744 is an arc, and United States Patent No. is prepared by the method described in No. 5,445,949 and recovered DLU 100 U / ㎖ with the exception of Pseudomonas (Pseudomonas) Rapa azepin commercially available is used in a concentration of. DLU lipase activity was determined spectroscopically at 550 nm as the amount of resorphin produced in hydrolysis of 1,2-O-diaryryl-rac-glucero-3-glutaric acid resorphin ester at pH 6.8 and 37 ° C. (Reference example WO95 / 30744). Resinase A2X® is a lipase produced by Novo Nordisk with a standardized activity of 100 KLU / g. Pectinex 3XL® is a pectinase produced by Novo Nordisk with Aspergillus niger and has a standardized activity of 3000 FDU / ml. Enzyme treatment was performed in a manner corresponding to Example 1. Laboratory sheets were prepared from the DIP / TMP mixture as in Example 1, except that only five sheets were prepared prior to enzyme treatment without using any filler. For all enzyme liquids, a dose of 1% was used.

Processing result:

Treated pH Peel Tension (N / m)

Before enzyme treatment / after enzyme treatment

Reference Material 5 Sheet 1 2.21 Sheet 1 2.59

Sheet 3 2.25 Sheet 2 2.63

Sheet 5 2.55 Sheet 3 2.63

Reference Material 7 Sheet 1 2.13 Sheet 1 2.28

Sheet 3 2.25 Sheet 2 2.58

Sheet5 2.36

Fergalase A40 (registered store) 5 Sheet 1 2.16 Sheet 1 1.44

(Cellulose / Hemicellulose) Sheet 3 2.18 Sheet 2 1.71

Sheet 5 2.55 Sheet 3 2.17

Pseudomonas Lipase 5 Sheet1 2.16 Sheet1 1.82

Sheet3 2.18 Sheet2 1.92

Sheet 5 2.32 Sheet 3 2.05

Pseudomonas Lipase 7 Sheet1 2.24 Sheet1 1.94

Sheet 3 2.32 Sheet 2 2.13

Sheet 5 2.32 Sheet 3 2.32

Reginase® 5 Sheet 1 2.17 Sheet 1 2.09

(Lipase) Sheet3 2.28 Sheet2 2.13

Sheet 5 2.44 Sheet 3 2.28

Reginase® 7 Sheet1 2.15 Sheet1 2.02

(Lipase) Sheet3 2.24 Sheet2 2.34

Sheet 5 2.32 Sheet 3 2.40

Pectinex 3XL® 5 Sheet1 2.21 Sheet1 2.40

(Pectinase) Sheet3 2.24 Sheet2 2.47

Sheet 5 2.51 Sheet 3 2.47

Of the four enzyme preparations, Pergalase A40® most effectively improved the peeling of the paper web, corresponding to a decrease of about 38% in peel tension. The two lipases showed the greatest reduction in peel tension at pH 5 and slightly lower efficiency at pH 7. Pectinase showed a moderate exfoliation effect.

Example 3

Laboratory results were conducted to confirm the results and to ensure that the most efficient enzyme formulation chemicals did not improve exfoliation. The experiment was performed as in Example 2, using a fresh pulp sample, except that the level of peel force required was lower than in Example 2. All enzyme and reference treatments were performed at pH 5.

Treatment Peeling Tensile (N / m)

Before enzyme treatment / after enzyme treatment

Reference Material Sheet1 1.28 Sheet1 1.60

Sheet3 1.35 Sheet2 1.66

Sheet 5 1.66 Sheet 3 1.77

Inactivated pergalase A40® sheet 1 1.28 sheet 1 1.47

(Boiling for 20 minutes) Sheet3 1.49 Sheet2 1.66

Sheet 5 1.50 Sheet 3 1.92

Sheet 1 1.28 Sheet 1 1.43 of Fergalase A40 (registered trademark)

Formulation Chemicals Sheet3 1.39 Sheet2 1.47

Sheet 5 1.58 Sheet 3 1.60

Pseudomonas Lipase Sheet 1 1.20 Sheet 1 1.43

Formulation Chemicals Sheet3 1.39 Sheet2 1.47

Sheet 5 1.58 Sheet 3 1.60

Pseudomonas Lipase Sheet1 1.28 Sheet1 1.12

Sheet3 1.43 Sheet2 1.28

Sheet 5 1.54 Sheet 3 1.39

Fergalase A40 (R) Sheet1 1.24 Sheet1 0.78

Sheet3 1.43 Sheet2 1.28

Sheet 5 1.54 Sheet 3 1.20

The results clearly show that the active enzyme protein reduces the exfoliation factor. Thus, the paper sheet can be removed more easily from the balllock surface than in the reference material treatment.

Example 4

This example demonstrates the cellulase / hemicellulase for peeling the paper web from the squeeze roll surface material when making a paper sheet from a furnish from a paper machine that produces a SC paper of 56 g / m ² reference weight. And the effects of lipase enzymes. 1% enzyme solution was used for treatment at pH 5. Paper sheets were prepared and measurements were performed in a manner corresponding to that of Example 3.

Pulp mixture

Bleached / Unbleached TMP 50/50

Chemical Pulp / TMP 20/80

Grammar 56g / m ²

Ash content 24%

pH 4.7

Retaining agent (Fennopol K 3400 R) 470 g / t (0.27%)

Dry material after 40% compression

The primary purpose is to show how enzymes affect exfoliation when used alone or in combination.

Treatment Peeling Tensile (N / m)

Before enzyme treatment / after enzyme treatment

Reference Material Sheet1 1.50 Sheet1 1.75

Sheet3 1.67 Sheet2 2.05

Sheet 5 1.81 Sheet 3 2.21

Fergalase A40® Sheet 1 1.45 Sheet 1 1.07

Sheet3 1.47 Sheet2 1.12

Sheet 5 1.79 Sheet 3 1.41

Pseudomonas Lipase Sheet1 1.43 Sheet1 1.26

Sheet3 1.53 Sheet2 1.35

Sheet 5 1.60 Sheet 3 1.52

Fergalase A40® Sheet1 1.45 Sheet1 0.72

And Pseudomonas Lipase Sheet 3 1.52 Sheet 2 0.78

Sheet 5 1.64 Sheet 3 0.97

The enzyme reduced the peel tensile to approximately the same as that of the pulp mixture containing DIP. Surprisingly, when the two enzymes were used together, the force required to peel the paper from the voloke surface was highly reduced. Peel tension was 56% lower after enzyme treatment. Moreover, the treatment also appeared to reduce the rate of new deposit formation on the surface.

Example 5

This example shows a test performed on a pilot scale in a test apparatus substantially corresponding to the crimp portion shown in FIG. 1. The objective was to find out the effect of the pergalase A40® enzyme on the central roll of the squeezed portion of the paper machine and to find out how the pergalase A40® acts on the peeling of the paper web from the central roll. It's there.

The main dimensions and process conditions of the test apparatus are as follows: roll diameter: 1230 mm, nip load: 120 kN / m, roll material: ball lock, roll speed: 22 m / s. The temperature of the system was 47 ° C. and the pH was 4.3.

The furnish in the testing process is SC paper furnishing, ie the process involved is the production of magazine printing paper.

Reference Process R was carried out in the first stage of the test process for 3 hours. Application of the pergalase A40® enzyme, ie the actual test process K, was performed about 2.5 hours after the baseline process. The feed capacity of the enzyme mixture during the test process was 2 liters per ton of paper.

The accompanying Tables 1 and 3 show the effect of the application of the enzyme at both the reference process R and the actual test process K, ie at the peel point of the paper web from the central roll. It should be noted that both the reference process R and the actual test process K, ie, the draw difference is kept constant at a value of 0.49 m / s during application of the enzyme. The enzyme mixture was added to the raw water, mixed, sprayed onto the surface of the central roll through a nozzle located after the doctor blade, and then treated with a second doctor blade.

Table 1

Reference process R Hours (minutes) 015306090120180 Transition A → B / CM00.51.0000.50.5 Ash (%) 30.4-31.8 Grammar g / m ² 52.5-54.5 Test process K 195210235265295320 1.01.00.51.51.52.0 29.831.8 53.355.0

The table shows that point A in Fig. 2, that is, the peeling point of the paper web at the initial position during the reference process R, moves about 2 cm in the direction opposite to the direction of rotation of the central roll (transition, S, A → B, Fig. Shows 2). Ash content (%) and grammar are actually constant during the test process.

The test process shows that the application of the pergalase A40® enzyme in water to be sprayed onto the surface of the central roll causes a transition S of the delamination point of the significant paper web (FIG. 2). 2 also illustrates the transition, where point A represents the initial position, ie the position during the reference process, and point B represents the action of the enzyme, ie the transition. Referring to FIG. 3, the actual test process K also shows that the enzyme starts working within about 1 hour from the start of the application.

Example 6

The purpose of the test process to be carried out on a large scale is to find out the effect of the Pergalase A40®, which was studied in Example 2, on the release of the paper web from the central roll in the crimp section and the maintenance of the central roll cleaning. Rather, it is to discover possible effects on the properties of the destruction pulp and paper due to the migration of Pergalase A40® from the central roll to the destruction system.

The conditions of the municipal permit process:

Paper grade:

50 g / m ² paper (30% ash) and

60g / m ² paper (32% ash)

Production rate:

55t / h

Working speed

1550 m / min

Test device:

Different mixtures of materials with the following components were applied by spraying on the central roll in the crimp section before the doctor braid:

Test Part 1. Water + Conventional Peeling Chemicals [Celfix®], i.e. Reference Material A

Test Part 2. Test Process K, ie Pergalase A40®, Reference Substances A and B, with a volume of 0.2 liters of water per ton of paper

Test Part 3. Pure Water, i.e. Reference Substance B

Test Part 4. Reference Substance A

When the dose according to test part 1 was administered, the pulper of the first press was emptied at intervals of 1 to 2 hours, thus carrying more Pergalase A40® in the disruption system as well.

Post Processing and Measurement:

New car:

Contamination of the center roll within 4 minutes, lubrication of the center roll stops;

Destroyed capacity quality;

Quality of paper;

Dehydration and retention.

Path and result of the test process:

The criteria for test part 2 at the start of the test process are test part 1 and at the end of the test process are test parts 3 (2 hours) and 4.

Table 1 shows the results of the test process with regard to contamination of the drawn cars and the center roll. Using reference water as pure water (test part 3) or water + peeling chemistries (test parts 1 and 4), it is suggested that Pergalase A40® reduces the need for elongation from 3.42% to 3.31%. Able to know. In addition, when starting with test part 2, ie Pergalase A40®, a consumption time of about 1.0 to 1.5 hours is required before improvement is observed in the peeling of the paper web from the central roll, and into test part 2 It should be noted that after 2 hours from the start, the effect is confirmed and the extension car may be reduced. In a corresponding manner, within 0.5 to 1 hour after discontinuing application of the Pergalase A40®, ie, starting test part 3, peeling from the central roll was clearly reduced and the draw difference increased.

Table 1. Effect of different treatments on tension difference

Test part Elongation% One 3.42 2 3.31 3 3.43 4 3.42

The effect of Fergalase A40® is apparent when studying contamination of central rolls. Although the difference between pure water (test part 3) and water + stripping chemicals (test parts 1 and 4) is small, the amount of material attached to the central roll during treatment with Pergalase A40® (test part 2) Significant decrease compared to test sections 1, 3 and 4.

During the test process, the quality of the destructive material, the quality of the paper, dehydration and retention were also observed, but no deviation from normal fluctuations was observed.

A large scale test process lubricates the central roll of the press section with an enzyme-containing fluid (pergalase A40® / water mixture) to both peel off the paper web and maintain the central roll wash. Significantly better results are achieved than conventional methods, ie pure water or a mixture of water and stripping chemicals. From the central roll, a fluid containing the enzyme (Pergalase A40®) was transferred to the disruption system, but no significant effect was observed on the quality of the destructive or paper, either dehydrated or retained.

Example 7

This experiment was carried out in a laboratory to remove impurities by enzymes from wire materials obtained from paper machines producing printing paper and using thermodynamic pulp and DIP as the pulp feedstock. The pergalase A40® cellulase / hemicellulase mixture and Pseudomonas lipase were studied by wire treatment at pH 5 and 50 ° C. Wire pieces were maintained for 24 hours in an enzyme solution (Pergalase A40® 2700 U / mL, Pseudomonas 500 DLU / mL). Prior to treatment, deposits were studied and labeled with a stereomicroscope and the same deposits were tested after treatment. Further washes were performed using a pressure washer after 5 seconds of enzyme treatment. Deposits were tested after enzyme treatment and after pressure washing.

Processing material Number of deposits before and after enzyme treatment Number of deposits in enzymatic wires before and after pressure washing Reference substance 6/6 10/10 Fergalase A40 (registered trademark) 7/7 8/8 Pseudomonas lipase 8/8 9/2 Fergalase A40® + Pseudomonas Lipase 8/8 8/2

Observation by stereomicroscope clearly demonstrated that after enzymatic treatment the deposits still adhere to the wire, but can be removed much more easily by mechanical forces such as pressure washing. High pressure water showers were often used in mills throughout the day to clean wires and felts when the paper machine was in operation.

Example 8

This example describes a milling test performed on a paper machine producing printing paper from thermodynamic and deink pulp. Peeling of the paper web was studied in the fourth press nip following the center compression roll. The purpose of the grinding test is to improve the exfoliation by the use of enzymes. The enzyme was applied in a similar manner to that shown in FIG. For this test, a mixture of cellulase and lipase enzymes was prepared. The enzyme contains the following additives:

Cellulase: 2463 CMC U / ml

Lipase: 82 DLU / mL

Test process conditions:

Paper grade: 45 g / m ²

Production rate: 34.8 t / h

Paper speed: 1447 m / min

Test configuration:

Technical treatment period: conventional chemicals

Enzyme treatment period: cellulose-lipase mixture, volume 0,18 l / t

Post Processing and Measurement:

Difference between the fourth nip and the dry part

Quality of paper

Wet end measurement

The draw difference between the fourth press nip and the dry portion was 13.1 m / min during the reference material treatment period. 15 minutes after initiating the addition of the enzyme, the peeling point of the paper web began to change, and during the next two times, it was clearly visualized that the peeling angle was smaller than before the enzyme addition. After 4 hours of initiation of the enzyme addition, the draw difference was reduced to 12.2 m / min, corresponding to a decrease of about 7%. The enzyme did not cause a negative effect on the quality of the paper or the wet end chemistry.

Example 9

This example describes a pulverization test to study the separation of chemical pulp webs from two compression rolls in a pulp dryer. Peeling was particularly difficult when using pulp containing high content of extract and hemicellulose. As the peeling chemical, a surfactant diluted with water was used for both compression rolls. Chemicals and enzymes were added to the top of the press to form a liquid layer in front of the doctor blade.

Test process conditions:

Pulp: Unbleached Birch Chemical Pulp

Production rate: 12 tons / h

Test configuration:

A mixture of cellulase and lipase was added in place of the surfactant in the compacting rolls to improve the exfoliation of the pulp web. The enzyme liquid contained the following additives:

Cellulase: 2488 CMC U / ml

Lipase: 407 DLU / mL

The enzyme was applied to two compression rolls at the following doses:

Press 1 Press 2

1 day: 0.24 ℓ / t 0.24 ℓ / t

2 days: 0.125ℓ / t 0.125ℓ / t

3 days: 0.08ℓ / t 0.08ℓ / t

0.24ℓ / t 0.08ℓ / t

Peeling of the pulp web using enzymes was equivalent to peeling with surfactants on days 1 and 2. On day 3, the reduction in capacity to 0.08 l / t in both compression rolls significantly increased the adhesion of the pulp web to the second press. After 15 minutes of varying the enzyme dose back to the level of 0.24 L / t in the second press, exfoliation was again improved to the same level on Days 1 and 2. During the test, no breakdown occurred in the press section, while during the reference process with current chemicals, the number of breaks in the press section was normally about 1 to 2 per 3 day process. It can be concluded that the enzyme can also be used to improve the exfoliation of the pulp web.

From the above description, the water + enzyme additive + conventional exfoliation chemistry is because the mechanisms of action of the different components are so different that no harmful interactions are possible, since the interaction mechanisms of the components of water, enzyme additives and exfoliating chemicals are supported by one another. It is apparent to those skilled in the art that mixtures of materials are also sufficiently possible.

It is clear that the present invention can also be effective with respect to other moving members in paper machines. For example, in felt, the action of at least equally effective enzymes can be expected.

Claims (12)

Moving members, such as cylinders, rolls, felts or wires, which are in contact with the paper web to be produced under conditions that adhere to the moving member during the papermaking process and expose it to materials in the paper web that tend to impair its operability; In the related art, in paper machines, the peeling and / or disassembly of at least one adhesive material from the moving member is carried out by a chemical process and carried on the moving member to maintain and / or improve the reliability of the moving member in the papermaking process. A method of applying to a moving member a composition comprising at least one enzyme suitable for acting on at least one substance to be bonded. The method of claim 1, wherein the one or more enzymes are selected to apply the composition according to the type of material that can be bonded or adhered to the moving member, so that the adhesive material is cellulose, hemicellulose, pectin, extract, protein , A wood component selected from lignin or lignans, a coating such as latex, starch and carboxy methyl cellulose (CMC). The method according to claim 1 or 2, wherein the enzyme is a cellulase selected from the group consisting of endoglucanases, cellobiohydrolases and β-glucosidase. The aceterase decomposing acetyl group according to claim 1 or 2, wherein the enzyme is endocylanase, endomanase, enzymatic digested arabinogalactase, β-xylosidase, β-mannosidase, and hemicellulose. , α-arabinosidase, α-glucuronidase and α-galactosidase. The method of claim 1 or 2, wherein the enzyme is a lipase. The method of claim 1 or 2, wherein the enzyme is a protease. The method of claim 1 or 2, wherein the enzyme is pectinase. The method of claim 1 or 2, wherein the enzyme is a redox enzyme selected from peroxidase or laccase. The method of claim 1 or 2, wherein the enzyme is an amylase. The method of claim 3, wherein the composition to be applied comprises at least two different components selected from the group consisting of cellulase, hemicellulase, lipase, protease, pectinase, redox enzymes and amylase. . The method of claim 1, wherein the composition to be applied comprises one or more enzymes with one or more non-enzymatic exfoliation chemicals. 2. The papermaking machine according to claim 1, wherein the moving member is a center roll in the crimped part, in particular in the crimped part thereof, in order to peel and / or disintegrate the at least one adhesive material from the center roll 1, in particular a center roll. In order to improve the controllability of the peeling of the paper web from the composition, a composition comprising at least one enzyme suitable for acting on at least one substance adhering to the central roll 1 from the paper web 6 by a chemical process is employed. Application to the outer surface of the central roll (1) at the crimped part.