Method for cleaning paper machine components and cleaning apparatus used therefor

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

Technical Field

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

Background Art

[0002] A paper-making machine is a machine for making paper. In a paper-making machine, usually, since paper is continuously manufactured at high speed, when contaminants such as pitch adhere to members constituting the paper-making machine (hereinafter also referred to as "paper-making machine components"), there is a problem that the yield is greatly reduced because the contaminants are transferred to the paper.

[0003] For example, since the felt, which is a paper-making machine component, has a certain thickness, contaminants such as pitch easily penetrate inside, and sufficient cleaning is difficult. Moreover, since the felt is strongly pressed against the wet paper, even contaminants that have penetrated inside cause contamination of the wet paper. Therefore, conventionally, a cleaning method capable of sufficiently cleaning the felt has been studied.

[0004] As a method for cleaning the felt, for example, in a method for cleaning a felt for papermaking in which a cleaning agent is mixed into warm water and sprayed onto the felt for papermaking, and the cleaning agent is allowed to penetrate deep into the felt for cleaning, the temperature of the warm water is 60 to 90 °C, and the injection pressure is 6 to 25 kg / cm 2 There is known a method for cleaning a felt for papermaking, which is characterized in that it is (for example, see Patent Document 1). Furthermore, for wire, felt, press rolls, canvas, or guide rolls, a spraying device provided on the paper machine is used, the spraying device comprising 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, the chemical liquid flowing inside the inlet pipe being able to flow into the main body, the main body being provided with multiple nozzles for spraying the chemical liquid, the nozzle diameter of the nozzle opening at the tip of the nozzles being 0.2 mm to 5.0 mm, the water pressure of the chemical liquid during spraying being 0.05 MPa or higher, and the amount of chemical liquid flowing into the main body being 1.0 × 10 -3 m 3 / min~5.0×10 -2 m 3 A method of spraying (washing) a chemical solution is known in which the chemical solution is composed of a chemical agent containing at least one selected from the group consisting of surfactants and water-soluble polymers, and water, with the mixing ratio of the chemical agent exceeding 0.1% by mass (see, for example, Patent Document 2). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 03-119195 [Patent Document 2] Japanese Patent Publication No. 2018-204167 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, while the cleaning methods described in Patent Documents 1 and 2 above provide a certain level of cleaning effect on the felt, they cannot be considered sufficient.

[0007] This invention has been made in view of the above circumstances, and aims to provide a method for cleaning paper machine components and a cleaning apparatus used therefor, which is simple yet can sufficiently improve the cleaning effect of the paper machine components. [Means for solving the problem]

[0008] The inventors of the present invention focused on the distance between the felt and the nozzle of the spray head, as the cause of the inconsistency in the effectiveness of conventional felt cleaning methods. Normally, since the chemical spraying device is retrofitted to the paper machine components, there is a certain distance (usually 50-300 mm) between the felt and the nozzle of the head. However, it was found that by deliberately reducing this distance to 0.1-30 mm, the cleaning effect is dramatically improved. Furthermore, we discovered that when cleaning at the above distance, the above problems can be solved even without containing chemicals by applying a predetermined cleaning water at a predetermined spraying pressure. We also found that the same effect can be obtained for components other than felt in the paper machine components, thus completing the present invention.

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

[0010] The present invention relates to a method for cleaning the components of a paper machine, which has at least a wet part in which paper stock is placed on a wire, moisture contained in the paper stock is removed to make wet paper, and the wet paper is compressed by a press roll via felt or transported by felt, and a dry part in which the moisture of the wet paper is evaporated, wherein the paper machine components are at least one selected from the group consisting of a wire, felt, press roll, wet paper guide roll for guiding the wet paper, wire guide roll for guiding the wire, felt guide roll for guiding the felt, canvas used when pressing the wet paper onto a dryer roll in the dry part, and canvas guide roll for guiding the canvas, and while the paper machine components are in operation, cleaning water containing hot water at 60°C or higher and less than 100°C is sprayed linearly onto the paper machine components from a cleaning water head, and the distance between the paper machine components and the opening of the cleaning water head is 0.1 to 30 mm.

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

[0012] In the cleaning method for paper machine components of the present invention, it is preferable that the spraying pressure of the cleaning water in the cleaning water head is 0.05 to 3.0 MPa.

[0013] In the cleaning method for paper machine components of the present invention, it is preferable that the angle between the surface of the paper machine component to be sprayed and the spraying direction of the cleaning water head is 45 to 135°.

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

[0015] The present invention relates to a cleaning device used in the above-described method for cleaning paper machine components, comprising a rail portion extending in the width direction of the paper machine component, a base portion that reciprocates and slides along the rail portion, and a cleaning water head attached to the base portion, wherein the cleaning water head has a protruding portion for bringing it closer to the paper machine component.

[0016] The present invention relates to a cleaning device used in the above-described method for cleaning paper machine components, comprising: a rail portion extending in the width direction of the paper machine component; a base portion that reciprocates and slides along the rail portion; a cleaning water head attached to the base portion; a chemical solution head attached to the base portion; and a cooling water head attached to the base portion, wherein the cleaning water head has a protrusion for bringing it closer to the paper machine component; when spraying cleaning water, chemical solution, and cooling water onto the paper machine component in that order, the cleaning water head, chemical solution head, and cooling water head are arranged in series from the upstream side in the operating direction of the paper machine component; and when spraying chemical solution, cleaning water, and cooling water onto the paper machine component in that order, the chemical solution head, cleaning water head, and cooling water head are arranged in series from the upstream side in the operating direction of the paper machine component.

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

[0018] In the paper machine component cleaning method of the present invention, the distance between the paper machine component and the nozzle of the cleaning water head is set to 0.1 to 30 mm, and by spraying the cleaning water in a straight line, contaminants are physically removed, and the cleaning effect can be greatly improved. In this case, by using hot water with added thermal energy at a temperature of 60°C to less than 100°C or steam at 100°C to 200°C as the washing water, the removal of contaminants can be accelerated.

[0019] In the method for cleaning a papermaking constituent member of the present invention, the spraying pressure of the cleaning water in the cleaning water head is set to 0.05 to 3.0 MPa, whereby the cleaning effect can be further improved. Also, by setting the angle formed between the sprayed surface of the papermaking constituent member and the spraying direction of the cleaning water head to 45 to 135°, the cleaning effect can be more sufficiently improved.

[0020] In the method for cleaning a papermaking constituent member of the present invention, when the papermaking constituent member is a wire, since the wire is made of fibers, has a high durability in terms of sewing method and structure, and is rigid, the cleaning effect can be significantly improved compared to the conventional method for cleaning a wire. Also, when the papermaking constituent member is a felt, by expanding the felt with heat and making it easier to penetrate deeper inside, the cleaning effect can be significantly improved compared to the conventional method for cleaning a felt.

[0021] In the method for cleaning a papermaking constituent member of the present invention, in addition to spraying the cleaning water, a chemical solution is sprayed from the chemical solution head, and further, cooling water is sprayed from the cooling water head, whereby not only contaminants can be peeled off, but also a part of them can be dissolved and washed away. Also, at this time, by applying the cleaning water and the chemical solution to the papermaking constituent member first 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 method for cleaning a papermaking constituent member described above, and thus can exhibit the above-described cleaning effect. Also, since the cleaning device is a sliding type including a rail part, a base part, and a cleaning water head, its structure is simple and relatively lightweight, and it can be easily installed on the papermaking constituent member. [[ID=二十ー]] [[ID=二十二]]Also, since the cleaning water head has a protruding part to approach the papermaking constituent member, it is not necessary to approach the rail part to the papermaking constituent member in order to set the distance between the papermaking constituent member and the mouth part of the cleaning water head to 0.1 to 30 mm. Thereby, the rail part can be safely installed. [[ID=二十三]]

[0023] In addition, if the cleaning device further includes a cleaning head and a cooling water head, the cleaning effects described above can be achieved. Furthermore, in the cleaning device, the cleaning water head, the cleaning head, and the cooling water head are all attached to the base, thus maintaining a simple configuration. Furthermore, by arranging the paper machine components in the order of washing water head, chemical solution head, and cooling water head from the upstream side in the direction of operation, or in the order of chemical solution head, washing water head, and cooling water head, the above-mentioned effects can be obtained. By further arranging these in series, it becomes possible to reliably supply cooling water to the locations where the washing water head and chemical solution head are attached.

[0024] Since the chemical solution of the present invention is used in the above-described method for cleaning the components of a paper machine, it can exhibit the above-described cleaning effect. Furthermore, by including a nonionic surfactant or anionic surfactant in the chemical solution, the dissolving effect on contaminants such as pitch adhering to the paper machine components can be improved. [Brief explanation of the drawing]

[0025] [Figure 1] Figure 1 is a schematic side view showing a part of a paper machine in a cleaning method for paper machine components according to this embodiment. [Figure 2] Figure 2 is a schematic diagram illustrating the process of spraying cleaning water onto the paper machine components shown in Figure 1. [Figure 3] Figure 3 is a perspective view showing the cleaning apparatus according to this embodiment. [Figure 4] Figure 4 is a magnified perspective view of the base and each head of the cleaning device shown in Figure 3. [Modes for carrying out the invention]

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

[0027] (Method for cleaning components of a paper machine) The paper machine component cleaning method according to the present invention is a method for cleaning the components that make up a paper machine. In other words, it is a method that can be used to clean each individual component of a paper machine. Specific examples of paper machine components will be described later. Here, a "paper machine" is a machine that continuously produces paper, and any general-purpose machine with the parts described later can be used. In other words, the cleaning device described later can be retrofitted to an existing paper machine. The "paper" produced by a paper machine is not particularly limited, although there are differences in the degree of contamination. It can include so-called Western-style 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 cardboard such as corrugated cardboard base paper, white cardboard, colored cardboard, paper tube base paper, building material base paper, and various types of backing paper. Furthermore, as "paper stock," pulp, recycled paper, or mixtures of pulp and recycled paper can be used. Furthermore, "contaminants" are any objects that contaminate the wet paper, such as pitch, water stains, oil stains, insects, paper dust, slime, etc. Furthermore, "direction of operation" refers to the direction in which the components of the paper machine travel or rotate while in operation. Furthermore, the operating direction of the paper machine components and the width direction of the paper machine components are perpendicular to each other.

[0028] Figure 1 is a schematic side view showing a part of a paper machine in the paper machine component cleaning method according to this embodiment. In Figure 1, position W indicates the position to which the paper machine component cleaning method according to this embodiment can be applied. As shown in Figure 1, the paper machine 100 includes at least a pulp mixing part P1 for mixing the pulp in the headbox 1, a wet part P2 for placing the pulp X on a wire 2 (long screen) to remove the moisture contained in the pulp X to make wet paper X1, and compressing the wet paper X1 with a press roll 4 via felt 3 to remove moisture, a dry part P3 for pressing the wet paper X1 with a canvas 6 so that it comes into contact with a dryer roll 5 to evaporate the moisture from the wet paper X1, a calendering part (not shown) for performing so-called calendering, and a winding part (not shown) for winding the paper onto a reel. In other words, the paper machine shown in Figure 1 is a multi-cylinder paper machine used to manufacture cardboard and paper.

[0029] Furthermore, the paper machine 100 includes a wet paper guide roll 10 for guiding the wet paper X1, a wire guide roll 20 for guiding the wire 2, a felt guide roll 30 for guiding the felt 3, and a canvas guide roll 60 for guiding the canvas 6. Therefore, the paper machine 100 makes it possible to continuously manufacture paper by passing through these parts.

[0030] The paper machine components are at least one selected from the group consisting of the wire 2, felt 3, press roll 4, canvas 6, wet paper guide roll 10 for guiding wet paper X1, wire guide roll 20 for guiding wire 2, felt guide roll 30 for guiding felt 3, and canvas guide roll 60 for guiding canvas 6, among the components of the paper machine described above. Among these, the paper machine component is preferably wire 2 or felt 3 from the viewpoint of the cleaning effect according to the present invention.

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

[0032] Figure 2 is a schematic diagram illustrating the process of spraying cleaning water onto the paper machine components shown in Figure 1. As shown in Figure 2, in the method for cleaning the paper machine component Z, cleaning water is sprayed onto the paper machine component Z using a cleaning water head 11 while the paper machine component Z is in operation. Details of the cleaning water head 11 will be described later.

[0033] In the method for cleaning the paper machine component Z, the cleaning water is sprayed linearly from the cleaning water head 11. This spraying can be carried out using a sliding type cleaning device, as described later, or by using a shower device that extends across the entire width of the paper machine component and has multiple nozzles. This improves the impact of the washing water on the paper machine components, thereby enhancing the cleaning effect. Furthermore, if the paper machine component Z is felt 3, for example, by spraying cleaning water in a straight line from the cleaning water head, the cleaning water can easily reach the inside of the felt 3.

[0034] In a method for cleaning a paper machine component Z, the distance D1 between the paper machine 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 paper machine component Z and the opening 11c of the washing water head 11 to 0.1 to 30 mm, the washing effect can be greatly improved. On the other hand, if the distance D1 between the paper machine component Z and the opening 11c of the washing water head 11 is made larger than 30 mm, a sufficient washing effect cannot be obtained.

[0035] Furthermore, the spray pressure of the cleaning water in the cleaning water head 11 is preferably 0.05 to 3.0 MPa. If the spraying pressure is less than 0.05 MPa, the effect of removing contaminants will be insufficient compared to when the spraying pressure is within the above range. If the spraying pressure exceeds 3.0 MPa, there is a risk of damaging the paper machine components Z (especially the felt 3) with prolonged use, compared to when the spraying pressure is within the above range.

[0036] Furthermore, the angle θ between the surface Za of the paper machine component Z that is sprayed and the spraying direction Y of the washing water head 11 is preferably 45 to 135°, and more preferably 70 to 110°. The "surface that is sprayed" refers to the contact surface of the paper machine component Z at the intersection of the spraying direction Y of the spray head, etc., and the paper machine component Z. If the angle θ between the surface Za of the paper machine component Z to be sprayed and the spraying direction Y of the washing water head 11 is less than 45° or greater than 135°, the washing water tends to scatter more easily compared to when the angle θ is within the above range, and therefore a sufficient cleaning effect tends not to be obtained.

[0037] In a method for cleaning the paper machine components Z, when the distance D1 from the opening 11c of the cleaning water head 11 is within the above range, and the spraying pressure of the cleaning water from the cleaning water head 11 is within the above range, the cleaning water used is either hot water at 60°C or above but below 100°C, or steam at 100°C to 200°C. In other words, in this case, sufficient cleaning effect can be achieved with just hot water at 60°C or above but below 100°C, or steam at 100°C to 200°C, without using surfactants or the like. Among these, the washing water is preferably water vapor at 100-200°C. In this case, the cleaning water becomes a gas containing fine water particles, increasing the surface area and making it possible to clean every corner of the paper machine components.

[0038] In a method for cleaning a paper machine component Z, if the paper machine component Z is a wire 2, the wire 2, although made of fibers, is highly durable and rigid due to its stitching and structure, thus significantly improving the cleaning effect compared to conventional wire cleaning methods. Furthermore, if the paper machine component Z is felt 3, the felt 3 can be expanded by heat, and the cleaning water can penetrate deeper into the material for cleaning, thus significantly improving the cleaning effect compared to conventional felt cleaning methods. Therefore, it is more preferable that the paper machine component Z is a wire 2 or felt 3, and that the washing water is steam at 100 to 200°C.

[0039] Wire 2 (papermaking mesh) can be made of polyester monofilament, polyamide monofilament, or the like. These may also be resin-coated. As felt 3, single-layer felt, double-layer felt, laminated felt, non-woven felt, seam-attached felt, etc. can be used. Among these, from the viewpoint of the cleaning effect according to the present invention, it is preferable to use single-layer felt or double-layer felt as felt 3.

[0040] In a method for cleaning a paper machine component Z, it is preferable to spray a chemical solution and cooling water onto the paper machine component Z in addition to cleaning water while the paper machine component Z is in operation. This allows the contaminants to be detached from the paper machine components Z by the washing water, partially dissolved by the chemical solution, and then washed away by the cooling water. This can further improve the cleaning effect.

[0041] In this configuration, as described above, the cleaning water is sprayed in a straight line from the cleaning water head 11, the chemical solution is sprayed in a fan or circular pattern from the chemical solution head, and the cooling water is sprayed in a fan pattern from the cooling water head. In this way, the chemical solution is sprayed in a fan or circular pattern, and the cooling water is sprayed in a fan pattern. Although the impact upon impact is weak, a sufficient amount can be applied over a wide area. In other words, the chemical solution can be reliably kept in contact with the washing water, and the cooling water can thoroughly wash away the chemical solution and any remaining contaminants.

[0042] In this case, in the method for cleaning the paper machine components Z, it is preferable to first apply cleaning water and chemical solution to the paper machine components Z, and then apply cooling water. The order in which the cleaning water and chemical solution are applied is not particularly limited. Furthermore, the spray locations of the cleaning water, the chemical solution, and the cooling water on the paper machine component Z may be the same or different.

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

[0044] In the method for cleaning the components of a paper machine, the distance between the paper machine component Z and the opening of the chemical solution head is not particularly limited and may be a general 50 to 300 mm. However, a drawback is that if the distance covered is too short, it will not be able to be applied over a wide area. Furthermore, while there are no particular limitations on the spraying pressure of the chemical solution in the chemical solution head, it is preferable to set it so that the impact of the chemical solution upon impact is smaller than the impact of the cleaning water upon impact. Furthermore, the angle between the surface Za of the paper machine component Z to be sprayed and the spraying direction of the chemical solution head is preferably 45 to 135°, similar to the case of washing water.

[0045] For example, a contamination prevention agent composition can be used as the chemical solution. Details of the chemical solution will be described later.

[0046] The cooling water used will be water at a temperature of less than 60°C. In the method for cleaning the 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 typical 50 to 300 mm. However, a drawback is that if the distance covered is too short, it will not be able to be applied over a wide area. Furthermore, while there are no particular limitations on the spraying pressure of the cooling water in the cooling water head, it is preferable to set it so that the impact of the cooling water upon impact is smaller than the impact of the cleaning water upon impact.

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

[0048] (Medicinal solution) The chemical solution is used in the cleaning method for the paper machine components described above. As the chemical solution, an aqueous solution of surfactant (5-20%) is preferably used. As for the surfactant, it is more preferable to include a nonionic surfactant or an anionic surfactant, and even more preferable to include a nonionic surfactant, primarily from the viewpoint of removing pitch (contaminants). Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyethylene alkyl thioethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene glycol, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, and glycerin fatty acid esters. These may be used individually or in combination.

[0049] Examples of anionic surfactants include aliphatic monocarboxylates, polyoxyethylene alkyl ether carboxylates, N-acyl sarcosine salts, N-acyl glutamates, dialkyl sulfosuccinates, alkanesulfonates, olefin sulfonates, alkylbenzene sulfonates, naphthalene sulfonate-formaldehyde condensates, alkylnaphthalene sulfonates, N-methyl-N-acyl taurine salts, alkyl sulfates, polyoxyethylene alkyl ether sulfates, oil sulfate esters, alkyl phosphates, polyoxyethylene alkyl ether phosphates, and polyoxyethylene alkylphenyl ether phosphates. These can be used individually or in combination.

[0050] (Cleaning device) The cleaning device is used in the cleaning method for the paper machine components described above. Figure 3 is a perspective view showing the cleaning apparatus according to this embodiment. As shown in Figure 3, the cleaning device 12 comprises a rail portion 13a extending in the width direction of the paper machine components, a base portion 13b that reciprocates and slides along the rail portion 13a, a cleaning 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 cleaning device 12, the cleaning water head 11, the chemical solution head 14a, and the cooling water head 14b are integrated and slide back and forth along the rail section 13a. Thus, because the cleaning device 12 has a simple structure and is relatively lightweight, it can be installed relatively easily on the components of the paper machine.

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

[0052] Figure 4 is a magnified perspective view of the base and each head of the cleaning device shown in Figure 3. As shown in Figure 4, the base portion 13b has a block portion 13b1 and a pair of frame portions 13b2 attached to the block portion 13b1. At the base portion 13b, the block portion 13b1 is capable of reciprocating and sliding along the rail portion 13. The frame portion 13b2 is supported by clamping the cleaning water head 11, the chemical solution head 14a, and the cooling water head 14b. At this time, the frame section 13b2 supports the chemical solution head 14a, the washing water head 11, and the cooling water head 14b, which are arranged in series from the upstream side in the operating direction of the paper machine components.

[0053] The cleaning water head 11 has a cleaning water head body 11a supported by the frame 13b2, and a cylindrical projection 11b that protrudes from the cleaning water head body 11a in the spraying direction. Furthermore, a mouth portion 11c is provided at the tip of the protruding portion 11b. The washing water head 11 has a protruding portion 11b, which allows the opening 11c to be easily brought close to the paper machine components. In other words, in order to keep the distance between the paper machine components and the opening 11c within the above range, it is not necessary to bring the rail section 13a close to the paper machine components. This allows the rail section 13a to be installed safely. Furthermore, in the washing water head 11, the washing water is guided by the protruding portion 11b, making it possible to spray the washing water onto the paper machine components in a more linear fashion. In this case, the total length D2 of the protruding portion 11b is preferably 10 mm or more, from the viewpoint of spraying cleaning water forcefully and linearly.

[0054] In addition, the chemical solution head 14a is provided with a nozzle 14a1 at the tip in the spraying direction, and the chemical solution is sprayed in a circular pattern from the nozzle 14a1. Furthermore, the cooling water head 14b is provided with a nozzle 14b1 at the tip in the spraying direction, and the cooling water is sprayed in a fan shape from the nozzle 14b1.

[0055] In the cleaning device 12, the above-described method for cleaning the paper machine components is performed. Therefore, the cleaning device 12 has a simple structure, yet it can sufficiently improve the cleaning effect of the paper machine components.

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

[0057] In the cleaning method for paper machine components according to this embodiment, a multi-cylinder paper machine for manufacturing cardboard and paper is used, but the method is not limited to this, and a household paper machine for manufacturing household paper may also be used. In this case, the paper machine includes at least a pulp mixing section for mixing the pulp in a headbox, a wet section for placing the pulp on a wire (cylinder mesh) and removing the moisture contained in the pulp to make wet paper, and for transporting the wet paper on felt, a dry section for evaporating the moisture from the wet paper, and a winding section for winding the paper onto a reel.

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

[0059] In the cleaning method for paper machine components according to this embodiment, cleaning water, chemical solution, and cooling water are sprayed onto the paper machine components, but the method is not limited to this, and cleaning water only may be sprayed, cleaning water and chemical solution may be sprayed, or cleaning water and cooling water may be sprayed.

[0060] In the method for cleaning paper machine components according to this embodiment, the cooling water consists of water at a temperature of less than 60°C, but may also 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 anionic surfactant, but may also contain polymers, chelates, organic acids, inorganic acids, organic bases, inorganic bases, etc.

[0062] The cleaning device 12 according to this embodiment includes a rail section 13a, a base section 13b, a cleaning water head 11, a chemical solution head 14a, and a cooling water head 14b. However, if chemical solution and / or cooling water are not to be sprayed, the corresponding chemical solution head 14a and cooling water head 14b do not need to be used, and the corresponding chemical solution head 14a and cooling water head 14b may be removed or otherwise omitted.

[0063] In the cleaning apparatus 12 according to this embodiment, the cleaning water head 11, the chemical solution head 14a, and the cooling water head 14b are integrated and reciprocate along the rail section 13a, but they may also reciprocate separately.

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

[0065] In the cleaning device 12 according to this embodiment, there is a cylindrical projection 11b that protrudes in the spraying direction from the cleaning water head body 11a, but the projection is not limited to a cylindrical shape and may be rectangular. Furthermore, in the cleaning device 12, the chemical solution is sprayed in a circular pattern and the cooling water is sprayed in a fan shape, but this is not limited to this configuration. [Examples]

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

[0067] (Examples 1-14 and Comparative Examples 1-6) A simulated stain consisting of an adhesive, calcium carbonate, and carbon black was applied to a designated area (50 cm x 50 cm) of felt for cardboard. The felt for cardboard was then operated on a felt running test machine (felt length 2.5 m, running speed 800 m / min) and washed for 30 minutes using the washing water shown in Table 1 and under the conditions shown in Table 1, in the washing apparatus shown in Figure 4. 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" is the distance between the felt for the cardboard and the opening of the cleaning water head, "Pressure" is the pressure of the cleaning water spray, and "Angle" is the angle of the cleaning water spray.

[0068] (Table 1) TIFF0007882461000001.tif147161

[0069] (evaluation) After cleaning, a photograph was taken of a designated area on the cardboard felt that had been treated with simulated dirt before cleaning, and the percentage of the area of ​​the cleaned portion (non-black portion) was calculated. Furthermore, if the area of ​​the cleaned portion is 50% or more, sufficient cleaning effect can be achieved even in actual use. The results obtained are shown in Table 2. In Table 2, "-" indicates an instance where measurement was not possible due to damage to the felt.

[0070] (Table 2) TIFF0007882461000002.tif112158

[0071] As is clear from the results in Table 2, it was confirmed that the cleaning methods of Examples 1 to 14 provide a sufficient cleaning effect compared to the cleaning methods of Comparative Examples 1 to 5. In particular, the cleaning effect was greatly enhanced by bringing the opening of the cleaning head closer to the paper machine components, and it was found that the cleaning effect decreased drastically when the distance increased beyond 30 mm. Furthermore, similar effects were observed in paper machine components other than felt. [Industrial applicability]

[0072] The present invention's method for cleaning paper machine components can be used in a paper machine used for manufacturing paper, as a method for cleaning components that make up the paper machine. Furthermore, the cleaning device of the present invention can be used as a device for cleaning components that make up a paper machine. The cleaning method and cleaning apparatus for paper machine components of the present invention are simple yet can significantly improve the cleaning effect of paper machine components. [Explanation of symbols]

[0073] 1. Headbox 10. Wet paper guide roll 100...paper machine 11. Washing water head 11a... Washing water head body 11b...Protrusion 11c,14a1,14b1...Mouth 12. Washing device 13a... Rail section 13b...Base 13b1... Block section 13b2...Frame section 14a... Head for chemical solutions 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 pulp mixing part P2...Wet part P3... Dry part X...Paper material X1...Wet paper Z... Paper machine components Za... Surface to be sprayed

Claims

1. A method for cleaning the components of a paper machine, comprising at least a wet part in which paper pulp is placed on a wire, the moisture contained in the paper pulp is removed to make wet paper, and the wet paper is compressed by a press roll via felt or transported by felt, and a dry part in which the moisture of the wet paper is evaporated, The paper machine component is at least one selected from the group consisting of the wire, the felt, the press roll, the wet paper guide roll for guiding the wet paper, the wire guide roll for guiding the wire, the felt guide roll for guiding the felt, the canvas used when pressing the wet paper onto the dryer roll in the dry part, and the canvas guide roll for guiding the canvas. While operating the paper machine components, cleaning water containing steam at 100-200°C is sprayed linearly onto the paper machine components from a cleaning water head, a chemical solution is sprayed from a chemical solution head, and cooling water is sprayed from a cooling water head. The distance between the paper machine component and the opening of the washing water head is 0.1 to 30 mm. A method for cleaning paper machine components, comprising spraying the cleaning water, the chemical solution, the cooling water, or the chemical solution, the cleaning water, and the cooling water in that order onto the paper machine components.

2. A method for cleaning the components of a paper machine, comprising at least a wet part in which paper pulp is placed on a wire, the moisture contained in the paper pulp is removed to make wet paper, and the wet paper is compressed by a press roll via felt or transported by felt, and a dry part in which the moisture of the wet paper is evaporated, The paper machine component is at least one selected from the group consisting of the wire, the felt, the press roll, the wet paper guide roll for guiding the wet paper, the wire guide roll for guiding the wire, the felt guide roll for guiding the felt, the canvas used when pressing the wet paper onto the dryer roll in the dry part, and the canvas guide roll for guiding the canvas. While operating the paper machine components, cleaning water containing hot water at 60°C to less than 100°C is sprayed linearly onto the paper machine components from a cleaning water head, a chemical solution is sprayed from a chemical solution head, and cooling water is sprayed from a cooling water head. The distance between the paper machine component and the opening of the washing water head is 0.1 to 30 mm. A method for cleaning paper machine components, comprising spraying the cleaning water, the chemical solution, the cooling water, or the chemical solution, the cleaning water, and the cooling water in that order onto the paper machine components.

3. The method for cleaning a paper machine component according to claim 1 or 2, wherein the paper machine component is the wire or the felt.

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

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

6. A paper machine component having at least a wet part in which paper stock is placed on a wire, moisture contained in the paper stock is removed to make wet paper, and the wet paper is compressed by a press roll via felt or transported by felt, and a dry part in which moisture is evaporated from the wet paper, 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 for guiding the wet paper, a wire guide roll for guiding the wire, a felt guide roll for guiding the felt, a canvas used when pressing the wet paper onto a dryer roll in the dry part, and a canvas guide roll for guiding the canvas, While operating the aforementioned paper machine components, cleaning water containing water vapor at 100 to 200°C is sprayed linearly onto the paper machine components from a cleaning water head. A cleaning device used in a method for cleaning paper machine components, wherein the distance between the paper machine component and the opening of the cleaning water head is 0.1 to 30 mm, The rail portion extending in the width direction of the paper machine component, A base that slides back and forth along the rail section, The cleaning water head attached to the base, Equipped with, A cleaning device having a protruding portion for bringing the cleaning water head closer to the paper machine components.

7. A paper machine component having at least a wet part in which paper stock is placed on a wire, moisture contained in the paper stock is removed to make wet paper, and the wet paper is compressed by a press roll via felt or transported by felt, and a dry part in which moisture is evaporated from the wet paper, 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 for guiding the wet paper, a wire guide roll for guiding the wire, a felt guide roll for guiding the felt, a canvas used when pressing the wet paper onto a dryer roll in the dry part, and a canvas guide roll for guiding the canvas, While operating the paper machine components, cleaning water containing hot water at 60°C or higher and less than 100°C is sprayed onto the paper machine components in a straight line from a cleaning water head. A cleaning device used in a method for cleaning paper machine components, wherein the distance between the paper machine component and the opening of the cleaning water head is 0.1 to 30 mm, The rail portion extending in the width direction of the paper machine component, A base that slides back and forth along the rail section, The cleaning water head attached to the base, Equipped with, A cleaning device having a protruding portion for bringing the cleaning water head closer to the paper machine components.

8. A cleaning device used in the method for cleaning paper machine components according to claim 1 or 2, The rail portion extending in the width direction of the paper machine component, A base that slides back and forth along the rail section, The cleaning water head attached to the base, The liquid dispensing head attached to the base, A cooling water head attached to the base, Equipped with, The washing water head has a protruding portion for bringing it closer to the paper machine component, When spraying the paper machine components with the cleaning water, chemical solution, and cooling water in that order, the cleaning water head, the chemical solution head, and the cooling water head are arranged in series from the upstream side in the operating direction of the paper machine components. When spraying the paper machine components with the chemical solution, the washing water, and the cooling water in that order, the washing device is arranged in series from the upstream side in the operating direction of the paper machine components, in the order of the chemical solution head, the washing water head, and the cooling water head.

9. A chemical solution used in the method for cleaning paper machine components according to claim 1 or 2, A chemical solution containing a nonionic surfactant or anionic surfactant.

Images