Method for cleaning papermaking machine component and cleaning device used for same

Abstract

[Problem] To sufficiently improve a cleaning effect of a papermaking machine component while being simple. [Solution] A papermaking machine component is at least one selected from the group consisting of: a wire (2); a felt (3); a press roll (4); a wet paper guide roll (10) for guiding wet paper (X1); a wire guide roll (20) for guiding the wire (2); a felt guide roll (30) for guiding the felt (3); a canvas (6) used when the wet paper (X1) is pressed against a dryer roll (5) at a dry part (P3); and a canvas guide roll (60) for guiding the canvas (6). While operating the papermaking machine component, cleaning water including hot water that is at least 60°C but less than 100°C or water vapor that is 100-200°C is linearly blown on the papermaking machine component from a cleaning water head (11). The distance between the papermaking machine component and an opening (11c) of the cleaning water head (11) is 0.1-30 mm.

Description

Method for cleaning paper machine components and cleaning device used therefor

[0001] The present invention relates to a cleaning method for cleaning components constituting a paper machine and a cleaning device used therefor.

[0002] A paper machine is a machine used to make paper. Because paper is typically produced continuously at high speed in a paper machine, if contaminants such as pitch adhere to components of the paper machine (hereinafter also referred to as "paper machine components"), the contaminants are transferred to the paper, resulting in a significant drop in yield.

[0003] For example, felt, a component of a paper machine, has a certain thickness, so contaminants such as pitch can easily penetrate into the interior, making it difficult to thoroughly clean. Moreover, because the felt is pressed firmly against the wet paper, even contaminants that penetrate into the interior can cause contamination of the wet paper. For this reason, cleaning methods that can thoroughly clean the felt have been studied.

[0004] As a method for cleaning felt, for example, a cleaning agent is mixed in warm water and sprayed onto the papermaking felt, and the cleaning agent penetrates deep into the felt to clean it. In this method, the temperature of the warm water is 60 to 90°C, and the spray pressure is 6 to 25 kg / cm. ２ A method for cleaning papermaking felt is known (see, for example, Patent Document 1). A spraying device provided in a papermaking machine is used for cleaning wires, felts, press rolls, canvases, or guide rolls, and the spraying device comprises a cylindrical main body extending in the width direction of the traveling body and an inlet pipe attached to at least one end of the main body, and the chemical solution flowing inside the inlet pipe can flow into the main body, the main body is provided with a plurality of nozzles for spraying the chemical solution, the nozzle openings provided at the tips of the nozzles have a nozzle diameter of 0.2 mm to 5.0 mm, the water pressure of the chemical solution during spraying is 0.05 MPa or more, and the amount of chemical solution flowing into the main body is 1.0 x 10 －３ m ３ / min to 5.0 x 10 －２ m ３ / min, the chemical solution contains a chemical agent containing at least one selected from the group consisting of surfactants and water-soluble polymers, and a chemical solution spraying method (cleaning method) in which the mixing ratio of the chemical agent exceeds 0.1 mass % is known (see, for example, Patent Document 2).

[0005] JP 03-119195 A JP 2018-204167 A

[0006] However, although the cleaning methods described in Patent Documents 1 and 2 can achieve a certain degree of cleaning effect on felt, it cannot be said that the cleaning effect is sufficient.

[0007] The present invention has been made in view of the above circumstances, and aims to provide a method for cleaning paper machine components that is simple yet can sufficiently improve the cleaning effect of paper machine components, and a cleaning device used therein.

[0008] The inventors of the present invention have noticed that the effectiveness of conventional felt cleaning methods varies, and have focused on the distance between the felt and the nozzle of the head that sprays the chemical solution as the cause. Typically, chemical spraying devices are retrofitted to papermaking machine components, so the distance between the felt and the nozzle of the head is a fixed distance (usually 50 to 300 mm). However, they have found that deliberately setting this distance to 0.1 to 30 mm dramatically improves cleaning effectiveness. Furthermore, they have found that when cleaning is performed at this distance, applying a specified amount of cleaning water at a specified spray pressure can solve the above problem even without the use of chemical solutions. Furthermore, they have found that similar effects can be obtained with papermaking machine components other than felt, leading to the completion of the present invention.

[0009] The present invention is a method for cleaning components of a paper machine having at least a wet part in which stock is placed on a wire, moisture contained in the stock is removed to form a wet paper, and the wet paper is compressed by a press roll via a felt or transported by the felt, and a dry part in which the moisture in the wet paper is evaporated, wherein the paper machine component is at least one selected from the group consisting of a wire, a felt, a press roll, a wet paper web guide roll that guides the wet paper, a wire guide roll that guides the wire, a felt guide roll that guides the felt, a canvas used when pressing the wet paper against a dryer roll in the dry part, and a canvas guide roll that guides the canvas, and while the paper machine component is operating, wash water containing steam at 100 to 200°C is sprayed linearly from a wash water head onto the paper machine component, and the distance between the paper machine component and the opening of the wash water head is 0.1 to 30 mm.

[0010] The present invention is a method for cleaning components of a paper machine having at least a wet part in which stock is placed on a wire, moisture contained in the stock is removed to form a wet paper, and the wet paper is compressed by a press roll via a felt or transported by the felt, and a dry part in which the moisture in the wet paper is evaporated, wherein the paper machine component is at least one selected from the group consisting of a wire, a felt, a press roll, a wet paper web guide roll that guides the wet paper, a wire guide roll that guides the wire, a felt guide roll that guides the felt, a canvas used when pressing the wet paper against a dryer roll in the dry part, and a canvas guide roll that guides the canvas, and the method involves spraying wash water containing hot water of 60°C or higher but lower than 100°C linearly from a wash water head onto the paper machine component while the paper machine component is operating, and the distance between the paper machine component and the opening of the wash water head is 0.1 to 30 mm.

[0011] In the method for cleaning paper machine components of the present invention, the paper machine components are preferably wire or felt.

[0012] In the method for cleaning paper machine components of the present invention, the spray pressure of the cleaning water from the cleaning water head is preferably 0.05 to 3.0 MPa.

[0013] In the method for cleaning paper machine components of the present invention, the angle formed between the sprayed surface of the paper machine component and the spray direction of the cleaning water head is preferably 45 to 135°.

[0014] In the method for cleaning paper machine components of the present invention, while the paper machine components are operating, a chemical solution is sprayed onto the paper machine components from a chemical solution head, and cooling water is also sprayed from a cooling water head, and it is preferable that the paper machine components are sprayed in the order of cleaning water, chemical solution, cooling water, or chemical solution, cleaning water, cooling water.

[0015] The present invention is a cleaning device used in the above-mentioned method for cleaning paper machine components, which is a cleaning device comprising a rail portion extending in the width direction of the paper machine components, a base portion that slides back and forth along the rail portion, and a cleaning water head attached to the base, wherein the cleaning water head has a protrusion for bringing it closer to the paper machine components.

[0016] The present invention is a cleaning device used in the above-mentioned method for cleaning papermachine components, and comprises a rail portion extending in the width direction of the papermachine components, a base portion that slides back and forth along the rail portion, a cleaning water head attached to the base, a chemical solution head attached to the base, and a cooling water head attached to the base, wherein the cleaning water head has a protrusion for bringing it closer to the papermachine components, and when cleaning water, chemical solution, and cooling water are sprayed onto the papermachine components in this order, the cleaning water head, chemical solution head, and cooling water head are arranged in series from the upstream side in the direction of operation of the papermachine components, and when chemical solution, cleaning water, and cooling water are sprayed onto the papermachine components in this order, the chemical solution head, cleaning water head, and cooling water head are arranged in series from the upstream side in the direction of operation of the papermachine components.

[0017] The present invention relates to a chemical solution used in the above-mentioned method for cleaning paper machine components, the chemical solution containing a nonionic surfactant or an anionic surfactant.

[0018] In the method for cleaning paper machine components of the present invention, the distance between the paper machine components and the opening of the cleaning water head is set to 0.1 to 30 mm, and the cleaning water is sprayed in a straight line, thereby physically removing contaminants and significantly improving the cleaning effect. In this case, the cleaning water used for cleaning is hot water with a temperature of 60°C or higher but lower than 100°C, or steam at 100 to 200°C, to which thermal energy has been added, thereby facilitating the removal of contaminants.

[0019] In the method for cleaning paper machine components of the present invention, the cleaning effect can be further improved by setting the spray pressure of the cleaning water from the cleaning water head to 0.05 to 3.0 MPa. Also, the cleaning effect can be more sufficiently improved by setting the angle between the sprayed surface of the paper machine component and the spray direction of the cleaning water head to 45 to 135 degrees.

[0020] The cleaning method for paper machine components of the present invention can significantly improve the cleaning effect compared to conventional wire cleaning methods when the paper machine components are wire, because the wire is made of fiber but is highly durable and rigid in terms of stitching and structure. Also, when the paper machine components are felt, the felt is expanded by heat and becomes more easily penetrated, so the cleaning effect can significantly improve compared to conventional felt cleaning methods.

[0021] In the method for cleaning paper machine components of the present invention, in addition to spraying cleaning water, a chemical solution is sprayed from a chemical solution head, and cooling water is also sprayed from a cooling water head, so that contaminants are not only peeled off but also partially dissolved and washed away. In addition, by first applying the cleaning water and chemical solution to the paper machine components and then applying the cooling water, the cleaning effect can be further improved.

[0022] The cleaning device of the present invention is used in the above-described method for cleaning papermachine components, and therefore can achieve the above-described cleaning effect. Furthermore, since the cleaning device is a sliding type equipped with a rail portion, a base portion, and a cleaning water head, it has a simple configuration, is relatively lightweight, and can be easily installed on the papermachine components. Furthermore, since the cleaning water head has a protrusion for bringing it closer to the papermachine components, it is not necessary to bring the rail portion closer to the papermachine components in order to set the distance between the papermachine components and the opening of the cleaning water head to 0.1 to 30 mm. This allows the rail portion to be installed safely.

[0023] In addition, if the washing device further includes a washing head and a cooling water head, the washing effect described above can be achieved. Furthermore, in the washing device, the washing water head, washing head, and cooling water head are all attached to the base, so the configuration can be kept simple. Furthermore, by arranging the heads in the order of washing water head, chemical solution head, and cooling water head, or the order of chemical solution head, washing water head, and cooling water head from the upstream side in the operating direction of the papermaking machine components, the above-mentioned effect can be achieved, and by further arranging these in series, it becomes possible to reliably apply cooling water to the locations where the washing water head and chemical solution head are provided.

[0024] The chemical solution of the present invention is used in the above-mentioned method for cleaning paper machine components, and therefore can exert the above-mentioned cleaning effect. Furthermore, by including a nonionic surfactant or an anionic surfactant in the chemical solution, the effect of dissolving contaminants such as pitch adhering to the paper machine components can be improved.

[0025] Fig. 1 is a schematic side view showing a part of a paper machine in a method for cleaning paper machine components according to this embodiment. Fig. 2 is a schematic view for explaining the state in which cleaning water is sprayed onto the paper machine components shown in Fig. 1. Fig. 3 is a perspective view showing a cleaning device according to this embodiment. Fig. 4 is a perspective view showing an enlarged view of the base and each head of the cleaning device shown in Fig. 3.

[0026] Preferred embodiments of the present invention will be described in detail below, with reference to the drawings as necessary. In the drawings, identical elements are designated by the same reference numerals, and duplicate explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to those shown.

[0027] (Method for Cleaning Paper Machine Components) The method for cleaning paper machine components according to the present invention is a method for cleaning components that make up a paper machine. That is, the method can be used to clean each of the paper machine components. Specific examples of paper machine components will be described later. Here, the "paper machine" refers to a machine that continuously produces paper, and any general machine having the respective parts described below can be used. That is, the cleaning device described below can be retrofitted to an existing paper machine. The "paper" produced by a paper machine is not particularly limited, although it varies in the degree of contamination. Examples include so-called western paper such as printing paper, newsprint, coated paper, packaging paper, tissue paper, household paper such as toilet paper and tissue paper, and miscellaneous paper, as well as so-called paperboard such as cardboard, white paperboard, colored paperboard, paper tube base paper, building material base paper, and various backing paper. Furthermore, pulp, waste paper, a mixture of pulp and waste paper, and the like can be used as the "paper stock." Furthermore, "contaminants" refer to objects that contaminate wet paper, such as pitch, water stains, oil stains, insects, paper dust, slime, etc. Furthermore, "operating direction" refers to the direction in which the paper machine components travel or rotate during operation. The operating direction of the paper machine components and the width direction of the paper machine components are perpendicular to each other.

[0028] FIG. 1 is a schematic side view showing a part of a paper machine used in a method for cleaning paper machine components according to this embodiment. Position W in FIG. 1 indicates a position where the method for cleaning paper machine components according to this embodiment can be applied. As shown in FIG. 1 , the paper machine 100 includes at least a stock preparation part P1 for preparing stock in a head box 1, a wet part P2 for placing stock X on a wire 2 (Fourdrinier) to remove moisture contained in the stock X and forming a wet paper X1, and compressing the wet paper X1 with a press roll 4 via a felt 3 to remove moisture, a dry part P3 for pressing the wet paper X1 with a canvas 6 so that it contacts a dryer roll 5 and evaporating the moisture from the wet paper X1, a calender part (not shown) for performing so-called calendering, and a winding part (not shown) for winding the paper onto a reel. That is, the paper machine shown in FIG. 1 is a multi-cylinder paper machine for producing paperboard or paper.

[0029] The paper machine 100 also has a wet paper web guide roll 10 that guides the wet paper web X1, a wire guide roll 20 that guides the wire 2, a felt guide roll 30 that guides the felt 3, and a canvas guide roll 60 that guides the canvas 6. Therefore, the paper machine 100 is capable of continuously producing paper by passing through these parts.

[0030] The paper machine component is at least one selected from the group consisting of the wire 2, the felt 3, the press roll 4, the canvas 6, the wet paper web guide roll 10 that guides the wet paper web X1, the wire guide roll 20 that guides the wire 2, the felt guide roll 30 that guides the felt 3, and the canvas guide roll 60 that guides the canvas 6. Of these, the paper machine component is preferably the wire 2 or the felt 3 from the viewpoint of the cleaning effect according to the present invention.

[0031] These paper machine components are components that come into direct or indirect contact with the wet paper during operation. In other words, by suppressing adhesion of contaminants to these paper machine components, it is possible to suppress the transfer of contaminants to the wet paper. As a result, it is possible to improve the yield of paper production. Incidentally, the dryer roll 5 is also a component that comes into direct contact with the wet paper, but because it operates in a special environment of high temperature and humidity, it is excluded from the paper machine components in the paper machine component cleaning method of the present invention.

[0032] Figure 2 is a schematic diagram for explaining the state in which wash water is sprayed onto the paper machine component shown in Figure 1. As shown in Figure 2, in the method for cleaning the paper machine component Z, wash water is sprayed onto the paper machine component Z by a wash water head 11 while the paper machine component Z is operating. Details of the wash water head 11 will be described later.

[0033] In the method for cleaning the paper machine component Z, the cleaning water is sprayed in a straight line from the cleaning water head 11. This spraying can be performed using a sliding-type cleaning device, which will be described later, or by using a shower device that extends across the entire width of the paper machine component and has multiple nozzles. This can improve the impact of the cleaning water when it hits the paper machine component, thereby enhancing the cleaning effect. Furthermore, if the paper machine component Z is a felt 3, for example, the cleaning water can be easily delivered to the inside of the felt 3 by spraying it in a straight line from the cleaning water head.

[0034] In the method for cleaning a papermachine component Z, the distance D1 between the papermachine component Z and the opening 11c of the cleaning water head 11 is 0.1 to 30 mm, preferably 0.1 to 10 mm, more preferably 0.1 to 5 mm, and even more preferably 1 to 5 mm. By setting the distance between the papermachine component Z and the opening 11c of the cleaning water head 11 to 0.1 to 30 mm, the cleaning effect can be significantly improved. On the other hand, if the distance D1 between the papermachine component Z and the opening 11c of the cleaning water head 11 is greater than 30 mm, a sufficient cleaning effect cannot be obtained.

[0035] The spray pressure of the wash water from the wash water head 11 is preferably 0.05 to 3.0 MPa. If the spray pressure is less than 0.05 MPa, the effect of removing contaminants will be insufficient compared to when the spray pressure is within the above range, and if the spray pressure exceeds 3.0 MPa, there is a risk of damaging the paper machine components Z (particularly the felt 3) over long periods of use compared to when the spray pressure is within the above range.

[0036] Furthermore, the angle θ formed between the sprayed surface Za of the papermachine component Z and the spraying direction Y of the wash water head 11 is preferably 45 to 135°, and more preferably 70 to 110°. Note that the "sprayed surface" refers to the contact surface of the papermachine component Z at the intersection of the spraying direction Y of the spray head or the like and the papermachine component Z. If the angle θ formed between the sprayed surface Za of the papermachine component Z and the spraying direction Y of the wash water head 11 is less than 45° or exceeds 135°, the wash water is more likely to scatter than when the angle θ is within the above range, and therefore sufficient cleaning effect tends not to be obtained.

[0037] In the method for cleaning paper machine components Z, when the distance D1 from the opening 11c of the cleaning water head 11 is set within the above range and the spray pressure of the cleaning water from the cleaning water head 11 is set within the above range, hot water at 60°C or higher but lower than 100°C, or steam at 100 to 200°C, is used as the cleaning water. That is, in this case, hot water at 60°C or higher but lower than 100°C, or steam at 100 to 200°C, can provide sufficient cleaning effects without using a surfactant or the like. Among these, steam at 100 to 200°C is preferred as the cleaning water. In this case, the cleaning water becomes a gas containing water particles, increasing the surface area and making it possible to clean every corner of the paper machine components.

[0038] In the method for cleaning a papermachine component Z, when the papermachine component Z is a wire 2, the wire 2 is made of fiber, but is highly durable and rigid in terms of stitching and structure, and therefore the cleaning effect can be significantly improved compared to conventional wire cleaning methods. Also, when the papermachine component Z is a felt 3, the felt 3 can be expanded by heat and the cleaning water can penetrate deeper into the felt for cleaning, thereby significantly improving the cleaning effect compared to conventional felt cleaning methods. Therefore, it is more preferable that the papermachine component Z is a wire 2 or a felt 3, and the cleaning water is steam at 100 to 200°C.

[0039] The wire 2 (papermaking net) may be made of polyester monofilament, polyamide monofilament, or the like. These may be resin-treated. The felt 3 may be a single-woven felt, a double-woven felt, a laminated felt, a non-woven felt, a seamed felt, or the like. Among these, it is preferable to use a single-woven felt or a double-woven felt as the felt 3 from the viewpoint of the cleaning effect according to the present invention.

[0040] In the method for cleaning the paper machine components Z, it is preferable to spray not only cleaning water but also chemicals and cooling water onto the paper machine components Z while the paper machine components Z are operating. This not only allows the cleaning water to peel off contaminants from the paper machine components Z, but also allows the chemicals to dissolve some of the contaminants, which can then be washed away with the cooling water. This further improves the cleaning effect.

[0041] As described above, the cleaning water is sprayed in a straight line from the cleaning water head 11, while the chemical solution is sprayed in a fan-like or circular pattern from the chemical solution head, and the cooling water is sprayed in a fan-like pattern from the cooling water head. Because the chemical solution is sprayed in a fan-like or circular pattern and the cooling water is sprayed in a fan-like pattern, the impact upon impact is weak, but a sufficient amount can be applied over a wide area. This means that the chemical solution can be reliably mixed with the cleaning water, and the cooling water can thoroughly wash away the chemical solution and any remaining contaminants.

[0042] Here, in the method for cleaning the paper machine component Z, it is preferable to first apply cleaning water and chemicals to the paper machine component Z, and then apply cooling water. The order in which the cleaning water and chemicals are applied is not particularly limited. Furthermore, the position on the paper machine component Z to which the cleaning water is sprayed, the position to which the chemicals are sprayed, and the position to which the cooling water is sprayed may be the same or different.

[0043] In the method for cleaning paper machine components Z, the cleaning effect can be further enhanced by first applying cleaning water and chemicals and allowing some of them to coexist. Furthermore, if the paper machine component is a felt 3, the felt 3 is expanded by the cleaning water, and the cleaning water and chemicals penetrate into the interior of the felt 3, thereby washing out contaminants. Then, the contaminants and chemicals are washed away with cooling water, and the felt 3 is cooled and shrinks, returning to its original state.

[0044] In the method for cleaning paper machine components, the distance between the paper machine component Z and the opening of the chemical head is not particularly limited and may be a typical value of 50 to 300 mm. However, if this distance is too small, there is a drawback in that it is not possible to apply the chemical over a wide area. The spray pressure of the chemical head is not particularly limited, but it is preferably set so that the impact of the chemical when it lands is smaller than the impact of the cleaning water when it lands. The angle between the sprayed surface Za of the paper machine component Z and the spray direction of the chemical head is preferably 45 to 135°, as in the case of cleaning water.

[0045] As the chemical solution, for example, an antifouling composition can be used. Details of the chemical solution will be described later.

[0046] The cooling water used is water at a temperature of less than 60°C. In the method for cleaning a paper machine component Z, the distance between the paper machine component Z and the opening of the cooling water head is not particularly limited and may be a general value of 50 to 300 mm. If the distance is too small, there is a drawback in that it is not possible to apply the cooling water over a wide area. The spray pressure of the cooling water head is not particularly limited, but it is preferably set so that the impact of the cooling water when it lands is smaller than the impact of the cleaning water when it lands.

[0047] In the method for cleaning paper machine components, when the paper machine component is a felt 3, it is preferable to apply wash water or apply wash water, a chemical solution, and cooling water, and then suck the moisture out of the felt 3 using a suction device called a suction box. This makes it possible to remove moisture contained in the felt 3 due to the wash water, cooling water, etc. Furthermore, if any washed-out contaminants remain on the surface of the felt 3, they can be removed by suction.

[0048] (Chemical Solution) The chemical solution is used in the above-mentioned method for cleaning paper machine components. As the chemical solution, an aqueous solution (5 to 20%) of a surfactant is preferably used. From the viewpoint of mainly removing pitch (contaminants), the surfactant preferably contains a nonionic surfactant or an anionic surfactant, and more preferably contains a nonionic surfactant. Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyethylene alkyl thioethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxypropylene glycols, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, and glycerin fatty acid esters. These may be used alone or in combination.

[0049] Examples of anionic surfactants include aliphatic monocarboxylates, polyoxyethylene alkyl ether carboxylates, N-acylsarcosinates, N-acylglutamates, dialkyl sulfosuccinates, alkanesulfonates, olefinsulfonates, alkylbenzenesulfonates, naphthalenesulfonate-formaldehyde condensates, alkylnaphthalenesulfonates, N-methyl-N-acyltaurates, alkyl sulfates, polyoxyethylene alkyl ether sulfates, fat and oil sulfates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl phenyl ether phosphates, etc. These may be used alone or in combination.

[0050] (Washing Device) The washing device is used in the above-described method for washing paper machine components. FIG. 3 is a perspective view showing the washing device according to this embodiment. As shown in FIG. 3, the washing device 12 includes a rail portion 13a extending in the width direction of the paper machine components, a base portion 13b that slides back and forth along the rail portion 13a, a washing water head 11 attached to the base portion 13b, a chemical solution head 14a attached to the base portion 13b, and a cooling water head 14b attached to the base portion 13b. In the washing device 12, the washing water head 11, the chemical solution head 14a, and the cooling water head 14b slide back and forth along the rail portion 13a as a unit. As such, the washing device 12 has a simple configuration and is relatively lightweight, making it relatively easy to install on paper machine components.

[0051] In the cleaning device 12, both ends of the rail portion 13a are attached and fixed to frames (not shown) provided on both sides of the paper machine component. The cleaning device 12 can be attached to conventional paper machine components afterward. The rail portion 13a is a housing having a rail on one side and incorporating a tube for circulating cleaning water, etc.

[0052] Figure 4 is an enlarged perspective view of the base and each head of the washing device shown in Figure 3. As shown in Figure 4, the base 13b has a block portion 13b1 and a pair of frame portions 13b2 attached to the block portion 13b1. In the base 13b, the block portion 13b1 is slidable back and forth along the rail portion 13. The frame portion 13b2 supports the wash water head 11, the chemical head 14a, and the cooling water head 14b by sandwiching them between them. In this case, the frame portion 13b2 supports the chemical head 14a, the wash water head 11, and the cooling water head 14b, which are arranged in series in this order from the upstream side in the operating direction of the paper machine components.

[0053] The wash water head 11 has a wash water head main body 11a supported by a frame portion 13b2 and a cylindrical protrusion 11b protruding from the wash water head main body 11a in the spraying direction. The protrusion 11b has a mouth 11c at its tip. Because the wash water head 11 has the protrusion 11b, the mouth 11c can be easily brought close to the paper machine components. In other words, it is not necessary to bring the rail portion 13a close to the paper machine components to keep the distance between the paper machine components and the mouth 11c within the above-mentioned range. This allows the rail portion 13a to be installed safely. Furthermore, in the wash water head 11, the wash water is guided by the protrusion 11b, allowing the wash water to be sprayed more linearly onto the paper machine components. In this case, the total length D2 of the protrusion 11b is preferably 10 mm or more from the viewpoint of spraying the wash water forcefully and linearly.

[0054] The chemical head 14a has a nozzle 14a1 at the tip in the spraying direction, from which the chemical solution is sprayed in a circular pattern, while the cooling water head 14b has a nozzle 14b1 at the tip in the spraying direction, from which the cooling water is sprayed in a fan pattern.

[0055] The above-described method for cleaning paper machine components is carried out in the cleaning device 12. Therefore, the cleaning device 12 has a simple configuration, yet can sufficiently improve the cleaning effect of paper machine components.

[0056] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0057] In the method for cleaning paper machine components according to this embodiment, a multi-cylinder paper machine for producing paperboard or paper is used, but the present invention is not limited to this, and a household paper machine for producing household paper may also be used. In this case, the paper machine has at least a stock mixing part for mixing the stock in a head box, a wet part for placing the stock on a wire (cylinder) and removing the moisture contained in the stock to form a wet paper, and transporting the wet paper on a felt, a dry part for evaporating the moisture from the wet paper, and a winding part for winding the paper onto a reel.

[0058] In the method for cleaning paper machine components according to this embodiment, the cleaning water is hot water at 60°C or higher but lower than 100°C, or steam at 100 to 200°C, but may also contain auxiliary agents such as antiseptics, rust inhibitors, disinfectants, and pH adjusters. The cleaning water may also contain the main components of a chemical solution. In other words, although the cleaning water and the chemical solution are sprayed separately onto the paper machine components, they may also be sprayed together.

[0059] In the method for cleaning paper machine components according to this embodiment, cleaning water, chemicals, and cooling water are sprayed onto the paper machine components, but this is not limited to this, and it is also possible to spray only cleaning water, or to spray cleaning water and chemicals, or to spray cleaning water and cooling water.

[0060] In the method for cleaning paper machine components according to this embodiment, the cooling water is water at a temperature of less than 60°C, but may contain auxiliary agents such as preservatives, rust inhibitors, disinfectants, and pH adjusters.

[0061] The chemical solution according to this embodiment contains a nonionic surfactant or an anionic surfactant, but may also contain other substances such as a polymer, a chelate, an organic acid, an inorganic acid, an organic base, or an inorganic base.

[0062] The cleaning device 12 according to this embodiment comprises a rail portion 13a, a base portion 13b, a cleaning water head 11, a chemical liquid head 14a, and a cooling water head 14b, but if chemical liquid and / or cooling water is not to be sprayed, the corresponding chemical liquid head 14a and cooling water head 14b do not need to be used, and the corresponding chemical liquid head 14a and cooling water head 14b may be removed, for example, and not provided.

[0063] In the cleaning device 12 according to this embodiment, the cleaning water head 11, the chemical liquid head 14a, and the cooling water head 14b are configured to slide back and forth along the rail portion 13a as a single unit, but they may also slide back and forth separately.

[0064] In the cleaning device 12 according to this embodiment, the chemical head 14a, the cleaning water head 11, and the cooling water head 14b are arranged in series in this order from the upstream side in the operating direction of the paper machine components, but the cleaning water head 11, the chemical head 14a, and the cooling water head 14b may also be arranged in series in this order from the upstream side in the operating direction of the paper machine components.

[0065] The cleaning device 12 according to this embodiment has a cylindrical protrusion 11b that protrudes in the spraying direction from the cleaning water head main body 11a, but the protrusion is not limited to a cylindrical shape and may be a square tube. Also, in the cleaning device 12, the chemical solution is sprayed in a circular shape, and the cooling water is sprayed in a fan shape, but this is not limiting.

[0066] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0067] (Examples 1 to 14 and Comparative Examples 1 to 6) Simulated soiling consisting of a mixture of adhesive, calcium carbonate, and carbon black was attached to a predetermined location (50 cm long x 50 cm wide) of a paperboard felt, and while the paperboard felt was operated in a felt running tester (felt length 2.5 m, running speed 800 m / min), washing was carried out for 30 minutes using the washing water shown in Table 1 under the conditions shown in Table 1 in the washing device shown in Figure 4. Note that an aqueous solution of polyoxyalkylene alkyl ether was used as the chemical solution, and water at 25°C was used as the cooling water. In Table 1, "D1" refers to the distance between the paperboard felt and the opening of the washing water head, "pressure" refers to the spray pressure of the washing water, and "angle" refers to the spray angle of the washing water.

[0068] (Table 1)

[0069] (Evaluation) After cleaning, a photograph was taken of a predetermined area of ​​the paperboard felt where simulated soiling had been applied before cleaning, and the percentage of the area of ​​the cleaned portion (non-black portion) was calculated. Note that if the area of ​​the cleaned portion is 50% or more, a sufficient cleaning effect can be achieved even in an actual machine. The results obtained are shown in Table 2. Note that in Table 2, "-" indicates cases where measurement was not possible due to damage to the felt.

[0070] (Table 2)

[0071] As is clear from the results in Table 2, the cleaning methods of Examples 1 to 14 were found to provide sufficient cleaning effects compared to the methods of Comparative Examples 1 to 5. In particular, the cleaning effect was greater when the nozzle of the cleaning head was brought closer to the paper machine components, and it was found that the cleaning effect decreased significantly as the distance increased beyond 30 mm. Similar effects were also observed with paper machine components other than felt.

[0072] The method for cleaning paper machine components of the present invention can be used as a method for cleaning components of a paper machine used to manufacture paper. Also, the cleaning device of the present invention can be used as a device for cleaning components of a paper machine. The method and device for cleaning paper machine components of the present invention are simple yet can sufficiently improve the cleaning effect of paper machine components.

[0073] DESCRIPTION OF SYMBOLS 1...Head box 10...Wet paper web guide roll 100...Paper machine 11...Washing water head 11a...Washing water head main body 11b...Protrusion 11c, 14a1, 14b1...Mouth portion 12...Cleaning device 13a...Rail portion 13b...Base portion 13b1...Block portion 13b2...Frame portion 14a...Chemical solution head 14b...Cooling water head 2...Wire 20...Wire guide roll 3...Felt 30...Felt guide roll 4...Press roll 5...Dryer roll 6...Canvas 60...Canvas guide roll P1...Paper stock mixing part P2...Wet part P3...Dry part X...Paper stock X1...Wet paper Z...Paper machine component Za...Sprayed surface

Claims

1. A method for cleaning components of a paper machine having at least a wet part in which stock is placed on a wire, the moisture contained in the stock is removed to form a wet paper, and the wet paper is compressed by a press roll via a felt or transported by a felt, and a dry part in which the moisture in the wet paper is evaporated, wherein the paper machine component is at least one selected from the group consisting of the wire, the felt, the press roll, a wet paper guide roll that guides the wet paper, a wire guide roll that guides the wire, a felt guide roll that guides the felt, a canvas used to press the wet paper against a dryer roll in the dry part, and a canvas guide roll that guides the canvas, and while the paper machine component is operating, wash water containing steam at 100 to 200°C is sprayed linearly onto the paper machine component from a wash water head, and the distance between the paper machine component and the opening of the wash water head is 0.1 to 30 mm.

2. A method for cleaning components of a paper machine having at least a wet part in which stock is placed on a wire, moisture contained in the stock is removed to form a wet paper, and the wet paper is compressed by a press roll via a felt or conveyed by a felt, and a dry part in which the moisture in the wet paper is evaporated, wherein the paper machine component is at least one selected from the group consisting of the wire, the felt, the press roll, a wet paper guide roll that guides the wet paper, a wire guide roll that guides the wire, a felt guide roll that guides the felt, a canvas used when pressing the wet paper against a dryer roll in the dry part, and a canvas guide roll that guides the canvas, and wherein washing water containing hot water of 60°C or more and less than 100°C is sprayed linearly from a washing water head onto the paper machine component while the paper machine component is operating, The method for cleaning a paper machine component, wherein the distance between the paper machine component and the opening of the cleaning water head is 0.1 to 30 mm.

3. A method for cleaning paper machine components according to claim 1 or 2, wherein the paper machine components are the wires or the felts.

4. A method for cleaning paper machine components according to claim 1 or 2, wherein the spray pressure of the cleaning water from the cleaning water head is 0.05 to 3.0 MPa.

5. A method for cleaning paper machine components according to claim 1 or 2, wherein the angle between the sprayed surface of the paper machine component and the spray direction of the cleaning water head is 45 to 135 degrees.

6. A method for cleaning a paper machine component according to claim 1 or 2, wherein a chemical solution is sprayed onto the paper machine component from a chemical solution head, and cooling water is further sprayed onto the paper machine component from a cooling water head while the paper machine component is operating, and the cleaning water, the chemical solution, and the cooling water are sprayed onto the paper machine component in this order, or the chemical solution, the cleaning water, and the cooling water.

7. A cleaning device used in the method for cleaning paper machine components according to claim 1 or 2, comprising: a rail portion extending in the width direction of the paper machine components; a base portion that slides back and forth along the rail portion; and a cleaning water head attached to the base, wherein the cleaning water head has a protrusion for bringing it closer to the paper machine components.

8. A cleaning device used in the method for cleaning paper machine components according to claim 6, comprising: a rail portion extending in the width direction of the paper machine components; a base portion that slides back and forth along the rail portion; the cleaning water head attached to the base; the chemical solution head attached to the base; and a cooling water head attached to the base, wherein the cleaning water head has a protrusion for bringing it closer to the paper machine components; and when the cleaning water, the chemical solution, and the cooling water are sprayed onto the paper machine components in this order, the cleaning water head, the chemical solution head, and the cooling water head are arranged in series from the upstream side in the direction of operation of the paper machine components; and when the chemical solution, the cleaning water, and the cooling water are sprayed onto the paper machine components in this order, the chemical solution head, the cleaning water head, and the cooling water head are arranged in series from the upstream side in the direction of operation of the paper machine components.

9. A chemical solution used in the method for cleaning paper machine components according to claim 6, which contains a nonionic surfactant or an anionic surfactant.

Images