JP2007330830A - Coating blade and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating blade capable of carrying out coating without causing the lowering of the flowability of a coating color or the change of rheology in the coating and free from the occurrence of failure such as streak, scratch, surface feeling defects or the like, and a method of manufacturing the same. <P>SOLUTION: The coating blade is provided with a slab having flexibility to uniformalize the coating thickness of a coating material applied on the surface of a raw paper web and a blade edge part at one end and a coating part to aim the improvement of life of the edge part and the improvement of paper product quality, wherein a flowability improving treatment part for improving the flowability of the coating material is provided on a part of the slab including the coating part. The flowability improving treatment part is formed by grinding or masking a part of the surface of the slab including the coating part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coating blade, and more particularly, to a flexible coating blade coated with a coating material for the purpose of improving wear resistance and surface properties, and a method for manufacturing the same.

  Conventionally, in the manufacturing process of coated paper, a coating blade has been used to make the coating thickness of the coating material applied to the base paper uniform and smooth the surface of the coated paper.

  The coating blade is hard to wear because the coating material applied to the base paper contains mineral pigment and is hard, and it was necessary to replace the blade frequently. The problem was whether to extend the service life. Another problem is that the surface quality of the blade is significantly deteriorated due to wear and the quality of the coated paper is lowered. In order to solve this problem, the blade base material is coated with a ceramic material such as cermet or alumina having higher wear resistance than the blade material by thermal spraying (Patent Document 1), There has been proposed (Patent Document 2) in which a metal plating layer in which fine diamond particles are partially exposed and dispersed in a portion in contact with the surface of a base paper web is coated by plating electrodeposition to improve the abrasion resistance of the blade.

  In general, in the initial stage of the coating process, the blade for coating is adjusted so as to conform to the unevenness of the base paper web, so that the blade tip portion is formed into a good shape so as to be in uniform contact with the base paper web. Initial familiarity is performed. Due to the initial familiarity, the cutting edge portion of the coating blade comes into uniform contact with the base paper web to which the coating material has been applied, and coating unevenness can be prevented.

  In order to facilitate this initial familiarization, the blade is mechanically machined with a wear surface corresponding to the initial wear before coating the coating material (Patent Document 3) or after coating, at the contact portion with the base paper web. There has been proposed a technique (Patent Document 4) in which initial familiarity is accelerated by polishing a blade into a shape gradually bulging from both ends to the center.

JP 59-88995 A JP 2004-57841 A Japanese Utility Model Publication No. 04-65169 Japanese Patent Laid-Open No. 06-55124

  In these coating blades, an edge is generated as a result of polishing to a specified angle and surface length in order to process into a specified design. This edge causes an abrupt vector change with respect to the flow of the coating material, and the viscosity changes because the fluidity of the coating color is hindered or the rheology is changed. Scratches and streaks are generated on the coated surface. In addition, non-uniform flow of the coating color, that is, turbulent flow causes poor surface feeling such as smoothness of the coated paper surface and reduction of gloss.

  On the other hand, according to the conventional technique, only the cutting edge portion that comes into contact with the base paper web is processed and polished to speed up the initial familiarity and to solve these problems. However, in the prior art, the portion to be processed and polished is limited to the contact portion between the base paper web and the blade, and the covering portion other than the contact portion is not subjected to the surface smoothing treatment. The shape affects the coating color. In this way, the shape of the coating that has not undergone surface smoothing changes the concentration and viscosity of the coating color, so that the coating color stains and particles adhere to the paper other than the part that is in contact with the paper, and are then laminated. Poor fluidity of the color and cause stains. As a result, streaks, scratches, and poor texture of the coated paper occur.

  Further, in the prior art, the treatment of the coated portion that is essentially not in contact with the paper or hardly in contact with the paper has been overlooked. However, the edges of the abrasive coating remain, and the edges interfere with the fluidity of the coating color and change the rheology, thus still causing scratches and streaks. The smoothness of the surface of the coating film to be applied is disturbed, resulting in poor surface feeling.

  Furthermore, in the prior art, since there is a step on the boundary line between the coating portion that is not in contact with the paper and the base material of the blade, the fluidity of the coating color is deteriorated or turbulence of the coating color occurs. Or even if foreign matter or dirt in the coating color adheres to the stepped part of the boundary line, the fluidity of the coating color deteriorates and turbulence occurs or the coating amount itself depends on the deposited coating color itself. Streaks due to poor adjustment, scratches, and poor surface appearance of coated paper occur.

  The present invention has been made to remedy the above-mentioned problems, and the object of the present invention is to apply coating during coating by applying a processing treatment to a portion which is not in contact with paper or hardly in contact with paper. Provided is a coating blade capable of performing mirror coating without causing deterioration in color fluidity and rheology, and without causing defects such as poor surface feeling or defective products, and a method for producing the same. There is.

  In order to achieve the above object, in the invention described in claim 1, in order to make the coating thickness of the coating material applied to the surface of the base paper web uniform, it has flexibility and has a cutting edge at one end thereof. In a coating blade provided with a steel piece to be provided and a coating portion for the purpose of improving the life and paper product quality at the cutting edge portion thereof, the fluidity of the coating material to a part of the steel piece including the coating portion is improved. A fluidity improvement processing unit is provided.

  In the present invention, the base paper web is a continuous winding paper in which the base paper is wrapped in a semi-cylindrical form on a backing roll that is a device for feeding the base paper, and the base paper is in an uncoated state and the base of the coated paper and It will be.

  In the coating process, the blade tip of the coating blade contacts the base paper web, and the coating material applied excessively on the surface of the base paper web is scraped to make the coating thickness of the coating material uniform. In this process, the coating blade is polished and worn by the coating material containing the mineral pigment. In order to suppress this, a coating material is coated on the cutting edge portion of the coating blade, preferably 3-20 mm of the cutting edge, but this coating material should be used ceramic materials such as alumina and cermet, metal plating, etc. Can do.

  According to the present invention, the fluidity of the coating material is improved and stabilized by providing the coating portion with a treatment portion for preventing fluidity improvement and rheology change. Here, the fluidity improving treatment part is formed by polishing or masking a part of the surface of the steel piece including the covering part. By providing this fluidity improvement processing section, it prevents the coating color with high foreign matter, dirt, and concentration / viscosity from adhering to the coating section without causing a change in viscosity in the coating color, and coating. Prevents color fluidity degradation. As a result, the coating liquid film is kept uniform like a mirror surface, and streaks, scratches, and poor quality of coated paper are eliminated.

  According to a second aspect of the present invention, in the coating blade according to the first aspect, the fluidity improving treatment portion is formed by rounding the edge of the covering portion covering the steel piece in the coating direction. A covering portion having smoothness in one width direction is included.

  In this invention, the edge of the coating | coated part which covers a steel piece means the area | region which is substantially contacting or not contacting with the base paper web. In the present invention, a material such as ceramic, cermet, or metal plating is sprayed on the covering portion, and one or a plurality of edges formed by polishing are rounded to form a smooth surface.

  In addition, the round processing means that the edge is polished into a curved shape, whereby the coating color flowing along the edge does not cause a sudden vector change, and the fluidity of the coating color is improved and uniform. Coated paper having a coating thickness can be supplied.

  According to a third aspect of the present invention, in the coating blade according to the first or second aspect, the fluidity-improving processing portion is a coating portion and a steel piece that are polished and processed so that there is no step. The boundary part is included.

  The covering portion to be covered with the covering material is at least a region in contact with the surface of the base paper web, and extends toward the center of the blade side portion, so that a boundary portion is formed. Of course, the entire surface of the blade may be covered, but from the viewpoint of cost, it is desirable to form the covering portion up to the center of the blade.

  Further, the processing includes so-called masking that specifically changes the direction of spraying to eliminate unevenness.

  According to a fourth aspect of the present invention, in the coating blade according to the first aspect, the coating portion is coated with a metal material by a plating process.

  According to invention of Claim 5, in the manufacturing method of the coating blade which consists of a flexible steel piece, the coating process which forms a coating | coated part for a lifetime improvement and paper product quality improvement, The said coating | coated part It has the fluidity improvement process which provides a fluidity improvement processing part so that fluidity with a coating material may be improved in a part of steel piece containing.

  In the present invention, the coating step may be a conventional coating method such as a thermal spray type in which a coating layer is melted and sprayed onto a steel piece to form a metal layer.

  According to the invention described in claim 6, in the coating blade manufacturing method according to claim 5, the fluidity improving step is a step in which round processing is performed on the edge portion of the covering portion covering the steel piece. It is characterized by including.

  According to the seventh aspect of the present invention, in the coating blade manufacturing method according to the fifth or sixth aspect, in the fluidity improving step, the boundary portion between the covering portion and the steel slab is polished or jointed. It is characterized by including a step of eliminating the step by processing so as not to exist.

  According to an eighth aspect of the present invention, in the coating blade manufacturing method according to the fifth aspect, the coating step is characterized in that the cutting edge is coated with a metal material by plating.

  By applying the coating blade according to the present invention, the edge that is not in contact with paper or hardly in contact with the paper is rounded to form a smooth surface, thereby improving the fluidity of the coating color and causing the edge. It is possible to prevent the occurrence of defects such as streaks and poor surface feeling due to changes in the physical properties of the coating liquid due to a change in rheology caused by a sudden vector change.

  Moreover, the effect similar to the above can be obtained by eliminating a step at the boundary portion by polishing or processing the boundary portion between the covering portion and the steel piece.

  Embodiments of a coating blade and a method for producing the same according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view of a coating blade using a sprayed layer as a coating portion according to an embodiment of the present invention. In the coating blade 1 according to the present invention, a side portion 6 that is in contact with the base paper web 4 is formed on one of the steel pieces 2, and a side portion 8 that faces the side portion 6 is formed on the other side. A blade edge portion is formed at the end of the side portion 6, and this blade edge portion needs to have a specific design depending on coating conditions. In general, the blade tip has an angle, and ceramic or the like is thermally sprayed along this. Ceramic or the like is sprayed from the blade edge portion to the center of the side portion 6 to form a sprayed layer 12 as a coating portion.

  The thermal spray layer 12 is polished to form a polished surface, and one or a plurality of edges 14 and 16 are formed of two polished surfaces adjacent to a portion that is not in contact with or hardly in contact with paper. The In order to improve the fluidity of the blade edge angle, the coating material introduction portion is wide and the blade edge is usually narrow and is in close contact with the paper.

  These edges 14 and 16 are further rounded to form corners of the surface in the coating material flow direction by rounding to form roundness, which is a fluidity improving processing portion, and smooth surfaces having smoothness in the width direction.

  In general, there are two types of round processing: a type in which a circular polishing machine swings and rotates horizontally on the edge to perform horizontal polishing, and a type in which the polishing is rotated to form a rounded smooth surface on the edge part. is there.

  Since the coating material 18 flows along a smooth surface obtained by round processing, the direction of the coating material 18 can be continuously changed, and generation of turbulent flow can be prevented.

  In the present invention, the sprayed surface formed on the slope 10 is defined as a bevel surface 20. The base paper web 4 is a continuous winding paper in which a base paper is wrapped in a semi-cylindrical shape on a backing roll 22.

  Subsequently, a usage mode of the coating blade configured as described above will be described below with reference to FIG.

  The base paper web 4 is continuously fed by the rotation of the backing roll 22 and wound around a take-up roll (not shown). The direction of rotation of the backing roll 22 is indicated by an arrow J in FIG.

  In the process of feeding the base paper web 4, a coating material 18 (coating color) is sprayed and applied to the base paper web 4 from the side 6 of the steel piece. An arrow K in FIG. 1 indicates the spraying direction of the coating material.

  Thereafter, the base paper web 4 coated with the coating material is pressed onto the surface of the base paper web 4 in the direction opposite to the rotation direction of the backing roll 22, thereby applying the coating material excessively applied on the base paper web 4. Is scraped off by the bevel surface 20. Thereby, the coated paper in which the coating thickness of the coating material is made uniform is manufactured. Similar to the prior art, the blade 1 is flexible and can adapt to the shape of the base paper web 4.

  The flow of the coating material 18 at this time is as shown by the arrow in FIG. 1. In the coating process, the coating material 18 adheres to the base paper web 4 and flows in the same direction as the rotation direction of the backing roll 22, and on the bevel surface. The direction of contact is changed, and a flow in the opposite direction to the base paper web 4 occurs along the side portion 6. In the present invention, the edge of the covering portion is smoothly formed in the coating material flow direction by round processing and is uniformly smooth in the width direction, so that non-uniform flow (turbulent flow) does not occur in the coating material, Since the coating material is transferred to the base paper in a mirror state with no unevenness in the width direction, no poor surface feeling occurs.

  According to one embodiment of the present invention, by smoothing the edge of the covering portion covering the steel piece by round processing, the fluidity of the coating material is promoted and the occurrence of turbulence is suppressed, and the coating material It prevents particles contained therein from depositing on the edge, and deposits are easily generated due to changes in rheology, thereby preventing the occurrence of scratches and streaks due to these foreign substances.

  FIG. 2 shows a third embodiment of the present invention, and further shows a coating blade in which the step at the boundary portion 25 between the sprayed layer 12 and the steel piece 2 is eliminated by polishing.

  The sprayed layer 12 is sprayed from the blade edge part of the steel slab 2 to the inner side. The sprayed layer 12 is sprayed so that its thickness decreases as it goes to the inner side, but the surface is not smooth only by spraying, and irregularities are formed on the inner boundary 25. In the present invention, a smooth surface is formed without a step by masking the boundary portion 25 where the irregularities are formed so as not to have a polishing process or a seam. Since the boundary portion 25 has flatness due to this processing, the coating material 18 is not contaminated with dirt and foreign matter, and turbulent flow does not occur. It is possible to eliminate the occurrence of streaks and eliminate surface defects.

  FIG. 3 is a schematic cross-sectional view of a coating blade using a plating layer as a covering portion according to the third embodiment of the present invention. In the coating blade 30 according to the present invention, a side portion 34 that contacts the base paper web 4 is formed on one of the steel pieces 32, and a side portion 36 that faces the side portion 34 is formed on the other side. The cutting edge portion of the side portion 34 needs to have a specific design depending on coating conditions. In general, the blade edge has an angle, and the plating layer 44 is formed from the edge portion to the center of the side portion 34.

  The plated layer 44 is formed from the end portion 46 of the steel piece 32 to the side portion 34 through the blade edge portion 38. In particular, the third embodiment of the present invention is formed by plating the plating layer without generating irregularities and steps in the boundary region 48 between the plating layer 44 of the side portion 34 and the steel piece 32. .

  Next, a usage mode of the coating blade configured as described above will be described below with reference to FIG.

  The base paper web 4 is continuously fed by the rotation of the backing roll 22 and wound around a take-up roll (not shown). The direction of rotation of the backing roll 22 is indicated by an arrow J in FIG.

  In the process of feeding the base paper web 4, a coating material 50 (coating color) is sprayed and applied to the base paper web 4 from the side 34 of the steel piece. An arrow K in FIG. 3 indicates the spraying direction of the coating material.

  Thereafter, the base paper web 4 to which the coating material is applied is pressed onto the surface of the base paper web 4 in the direction opposite to the rotation direction of the backing roll 22, thereby applying the coating material excessively applied on the base paper web 4. Is scraped off by the bevel surface 52. Thereby, the coated paper in which the coating thickness of the coating material is made uniform is manufactured. Similar to the prior art, the blade 32 is flexible and can adapt to the shape of the base paper web 4.

  The flow of the coating material 50 at this time is as shown by the arrow in FIG. 3, and in the coating process, a flow that adheres to the base paper web 4 in the same direction as the rotation direction of the backing roll 22 and the bevel surface. The direction of contact is changed, and a flow is generated along the side portion 34 in the opposite direction to the base paper web 4. In this invention, since a coating | coated part is smoothly formed by masking, a nonuniform flow (turbulent flow) does not generate | occur | produce and a surface defect does not generate | occur | produce.

1 is a schematic cross-sectional view showing a first embodiment of a coating blade according to the present invention. It is a schematic sectional drawing which shows 2nd embodiment of the braiding blade concerning this invention. It is a schematic sectional drawing which shows 3rd embodiment of the blade for coating which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating blade 2 Steel piece 4 Base paper web 6 Side part 8 Side part 10 Slope 14, 16 Edge 12 Thermal spray layer 18 Coating material 20 Bevel surface 22 Backing roll E Blade edge part 25 Boundary part 30 Coating blade 32 Steel piece 34 Side part 36 Side part 40 Slope 44 Plating layer 48 Boundary area 50 Coating material 52 Bevel surface

In order to achieve the above object, in the invention described in claim 1, in order to make the coating thickness of the coating material applied to the surface of the base paper web uniform, it has flexibility and has a cutting edge at one end thereof. In a coating blade comprising a steel slab comprising a coating part for the purpose of improving life and paper product quality at the blade edge part , a coating material on a part of the steel slab including the coating part not in contact with the base paper web ; A fluidity improvement processing unit for improving the fluidity of the liquid is provided.

According to the present invention, the fluidity of the coating material is improved and stabilized by providing the coating portion with a treatment portion for preventing fluidity improvement and rheology change. Here, the fluidity improving processing part is formed by polishing or masking a part of the surface of the steel piece including the covering part that is not in contact with the base paper web . By providing this fluidity improvement processing section, it prevents the coating color with high foreign matter, dirt, and concentration / viscosity from adhering to the coating section without causing a change in viscosity in the coating color, and coating. Prevents color fluidity degradation. As a result, the coating liquid film is kept uniform like a mirror surface, and streaks, scratches, and poor quality of coated paper are eliminated.

According to invention of Claim 5, in the manufacturing method of the coating blade which consists of a flexible steel piece, the coating process which forms a coating | coated part for a lifetime improvement and paper product quality improvement, The said coating | coated part It has the fluidity improvement process which provides a fluidity improvement processing part so that fluidity with a coating material may be improved in a part which is not in contact with a base paper web of a billet containing steel.

In order to achieve the above object, in the invention described in claim 1, in order to make the coating thickness of the coating material applied to the surface of the base paper web uniform, it has flexibility and has a cutting edge at one end thereof. In coating blades that have a steel slab and a coating on the cutting edge for the purpose of improving the service life and improving the quality of paper products , there are no surface defects due to turbulent flow , and there are no scratches or streaks due to deposits. A fluidity improvement processing part for improving fluidity with a coating material so as to prevent occurrence is provided at a part of an edge not in contact with a base paper web of a steel piece including the covering part. is there.

According to invention of Claim 5, in the manufacturing method of the coating blade which consists of a flexible steel piece, the coating process which forms a coating part for life improvement and paper product quality improvement, and turbulent flow generation The fluidity improving processing section for improving the fluidity with the coating material so as to prevent the occurrence of scratches and streaks due to the generation of deposits on the base paper web of the steel slab including the covering section It has the fluidity improvement process provided in a part of edge which is not touching, It is characterized by the above-mentioned.

Claims (8)

  In order to make the coating thickness of the coating material applied to the surface of the base paper web uniform, a steel piece having flexibility and having a blade edge portion at one end thereof, and improving the life and paper product quality at the blade edge portion. A coating blade provided with a coating portion as an object, wherein a fluidity improving processing portion for improving fluidity with a coating material is provided on a part of a steel piece including the coating portion. .   The said fluidity improvement process part contains the coating | coated part which has the smoothness in a steel piece width direction while the edge of the coating | coated part which covers a steel piece is round-processed in an application direction. Coating blade.   3. The coating blade according to claim 1, wherein the fluidity improving processing part includes a boundary part between a coating part and a steel piece that are polished and processed so as not to have a step. 4.   2. The coating blade according to claim 1, wherein the coating portion is coated with a metal material by plating.   In a manufacturing method of a coating blade made of a flexible steel piece, a coating step for forming a coating part for improving life and improving paper product quality; and a coating material on a part of the steel piece including the coating part; A method for producing a coating blade, comprising: a fluidity improving step of providing a fluidity improving processing section so as to improve the fluidity of the coating.   6. The method of manufacturing a coating blade according to claim 5, wherein the fluidity improving step includes a step of rounding the edge portion of the covering portion covering the steel piece.   The fluidity improving step includes a step of eliminating a step by polishing or processing a boundary portion between the covering portion and the steel piece so that there is no seam. Manufacturing method for industrial blades.   6. The method for manufacturing a coating blade according to claim 5, wherein the coating step includes coating the blade edge with a metal material by plating.

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