Ink scraper manufactured by lamination method and manufacturing method thereof

Abstract

The ink scraper of the present invention comprises a flat and elongated substrate and a first coating layer with a polymer-fiber fabric as the main material covering at least one side thereof, wherein the first coating layer contains at least one additional component for improving the wear resistance of the coating layer. The ink scraper of the present invention adopts a fiber fabric-reinforced thermosetting polymer as the coating layer, and the coating layer contains hard fillers and lubricating particles. The coating layer has a higher wear resistance and better deformation resistance, and can effectively increase the working life of the polymer coating layer. At the same time, the present invention also discloses a method for manufacturing the ink scraper. Through a lamination method, a thicker polymer coating layer can be processed at a lower cost, and the coating thickness can reach several hundred microns to several millimeters. The thicker polymer coating layer further increases the service life of the scraper and reduces the frequency of scraper replacement.

Description

Technical Field

[0001] The invention relates to a scraper for scraping off excess ink or glue on the surface of a roller, comprising a substrate and a first coating layer composed of polymer, glass fiber and filler on the substrate. In addition, the invention also relates to a method for manufacturing the scraper, belonging to the field of printing and coating technology. Background Art

[0002] Scrapers, or specifically doctor blades, are widely used tools, especially in the printing, coating and coating industries. Their function is to scrape excess ink or glue from a surface. The surface can be a flat surface (such as screen printing) or a round surface of a cylinder (such as gravure printing, vertical coating). The ink or glue can be liquid, paste, or even solid powder.

[0003] In the actual application of the scraper, the working edge of the scraper contacts the surface of the roller or drum at a certain angle and is often subjected to a certain pressure. When the roller or drum rotates, the scraper moves relative to its surface to scrape off excess ink. From the above process, it can be understood that: on the one hand, the degree of fit between the working edge of the scraper and the roller or drum has an important influence on the quality of printing and coating. If the scraper is not completely fitted or unevenly fitted, the amount of ink or glue in some areas will be uncontrollable. On the other hand, the scraper edge and the surface of the roller or drum are in a state of long-term wear. Therefore, the working edge of the scraper and the surface of the drum often need to be surface treated to increase their wear resistance.

[0004] In existing patents, improvements to scrapers are often based on a base layer made of steel, with a coating or covering layer made of alloy or polymer near the working edge of the base layer. The performance of the coating or covering layer directly affects the mechanical properties and friction properties of the scraper. The following are some patents that use polymer materials as coatings or covering layers:

[0005] (1) Document US7152526B2 reports an ink scraper having a first layer of alloy-based material and a second layer of resin-based material on a scraper substrate. The alloy of the first layer includes a nickel alloy mainly composed of nickel and a chromium alloy mainly composed of chromium, and the alloy contains SiC ceramic filler. The second layer is mainly composed of organic resins such as acrylic acid, phenol, epoxy, polyimide, polyolefin, etc., and contains particles of fluorine-based polymers.

[0006] (2) JP2000507523A reports an ink scraper, wherein one or both sides of the substrate surface are coated with a polymer material, and the surface energy thereof is 10-60 mN / m. The polymer material may be a hydrocarbon polymer, a fluorinated acrylic polymer, a polyether, a polyimide, a polyurethane, a polysilicon ether, a polytetrafluoroethylene, or the like.

[0007] (3) Document NL9300810A reports an ink scraper in which the coating is a plastic with a smooth surface, especially polytetrafluoroethylene; the base layer is an elastic material, especially rubber, in particular, foam rubber.

[0008] (4) Document US6681692B2 describes an ink scraper, the base layer of which is cold-rolled steel and the covering layer is a wear-prone material, including soft pure metal, soft alloy, oxide, polymer, etc., with a hardness of 200-600 HV.

[0009] (5) Document US7632560B2 reports an ink scraper, wherein the substrate is made of steel, and polytetrafluoroethylene is coated on the working surface of the substrate, wherein the polytetrafluoroethylene contains metal or metal carbide particles and lubricating particles. The manufacturing method of the scraper is also reported: the polymer coating is coated on the substrate by dipping, spraying, etc.

[0010] However, in terms of service life and wear resistance, the scrapers manufactured by the above technology are not completely satisfactory. The reasons are: First, the above technologies (1)(2)(3)(4) only use polymer materials as coatings, which have insufficient hardness and wear resistance, and the wear rate of the coating is relatively fast during continuous printing; even if granular wear-resistant fillers or lubricating fillers are used in the polymer, such as patent (5), the wear rate of the coating is still relatively high. Second, the polymer coating in the above technology often adopts a process of direct spraying and dipping on the substrate surface, and the coating thickness is relatively thin. Therefore, the amount of coating available for consumption in the working area is very small. The above two points lead to a high frequency of replacement of scrapers in continuous printing, affecting production efficiency.

[0011] On the other hand, in actual printing and coating production, if production is carried out immediately after the replacement of the scraper, it is easy to produce stripes, uneven production quality problems. The reason is that the contact between the new scraper and the roller or drum is not complete. Therefore, after replacing the scraper, it is often necessary to run the machine empty for about 10-60 minutes to run it in order to make the contact between the working edge of the scraper and the roller perfectly fit. In this regard, the polymer-coated scraper has the following advantages over other superhard-coated scrapers: First, the polymer-coated scraper has a shorter running-in time; second, the polymer-coated scraper causes less damage to the surface of the roller or drum during empty machine operation and subsequent production.

[0012] Therefore, the object of the present invention is to provide a scraper which can enhance the wear resistance and service life of the polymer coating and has the above advantages of the polymer coating: short running-in time and little damage to the roller or drum surface. Summary of the invention

[0013] Based on the above technical background and the failure investigation of the scraper, the idea of ​​the present invention is:

[0014] (1) The inventors of the present invention have found a basic fact in the investigation of polymer scraper failure: during use, polymer scrapers are subjected to pressure and mechanical wear, so local bending and defects occur at the working edge of the scraper, leading to failure. For this reason, the working edge of the polymer needs to have sufficient hardness, and the polymer needs to have a certain rigidity (high elastic modulus) and strength. Another basic fact is that when continuous fibers are used as reinforcing materials in polymers, the hardness, rigidity and strength of the polymer can be effectively improved, and the impact resistance of the local polymer can be improved. Therefore, the fiber-reinforced polymer used in the present invention is in contact with the roller or drum, and its effect is better than the pure resin or the filled modified material of the resin and the dispersed filler in the existing technical solutions. At the same time, the matrix is ​​made of an elastic alloy, which works together with the fiber-reinforced polymer to make the contact pressure between the scraper and the drum stable, uniform, and of appropriate size.

[0015] (2) In the investigation of metal or metal modified scrapers, the inventors discovered another basic fact: when a high-hardness metal is used as the working edge of the scraper, the running-in time between the new scraper and the roller is long, and the scraper wears the roller more. Therefore, considering the above two problems, the higher the hardness of the scraper edge, the better. An effective way to reduce the running-in time and roller wear is to appropriately reduce the hardness of the scraper edge. Therefore, compared with alloys, polymer materials are a better choice.

[0016] (3) Another obvious fact is that in order to extend the service life of the scraper, considering the wear rate of the polymer, increasing the thickness of the polymer layer is a feasible method.

[0017] In summary, the specific technical solutions of the present invention are as follows:

[0018] The present invention provides a scraper especially for the printing industry, which comprises a flat and elongated substrate and a first coating layer with polymer-fiber fabric as the main material covering at least one side thereof, wherein the first coating layer contains at least one additional component for improving the wear resistance of the coating layer.

[0019] The first coating is a laminated material formed by laminating and curing a semi-cured sheet whose main material is a thermosetting polymer and a fiber fabric. The thermosetting polymer includes one or more of a thermosetting epoxy resin polymer, a thermosetting polyimide polymer, and a thermosetting polyphenylene ether polymer.

[0020] The thermosetting epoxy resin polymer refers to a polymer having a three-dimensional network structure formed by a chemical reaction between a type of macromolecule containing two or more epoxy groups in the molecular structure and a curing agent. The epoxy resin is one or more of bisphenol A epoxy resin, brominated epoxy resin, novolac epoxy resin, multifunctional epoxy resin, phenoloxy resin, and brominated phenoloxy resin. The curing agent is one or more of aliphatic polyamine, aromatic amine, dicyandiamide, anhydride curing agent, linear phenolic resin, and polysulfide rubber.

[0021] The thermosetting polyimide polymer refers to a network structure polymer synthesized with bismaleimide (BMI) as a basic monomer. The bismaleimide is one or more of diamine-modified bismaleimide, epoxy resin-modified bismaleimide, allylphenyl compound-modified bismaleimide, thermoplastic resin-modified bismaleimide, cyanate-modified bismaleimide (BT resin), and triallyl isocyanurate-modified bismaleimide.

[0022] The thermosetting polyphenylene ether polymer refers to a bulk network structure polymer formed by reacting a thermosetting modified polyphenylene ether resin as a main resin with a curing agent. The thermosetting modified polyphenylene ether resin is one or more of polyolefin modified polyphenylene ether resin, epoxy modified polyphenylene ether resin, triallyl isocyanurate modified polyphenylene ether, cyanate modified polyphenylene ether resin, BT resin modified polyphenylene ether resin, and polyphenylene ether resin modified with allyl active groups on the polyphenylene ether molecular structure.

[0023] According to the present invention, the thermosetting epoxy resin polymer, thermosetting polyimide polymer, and thermosetting polyphenylene ether polymer include a polymer mixture with the above polymer as the main component. Here, the above thermosetting polymer can be used together with one or more of other modified resins, but the modified resin has a smaller share than the thermosetting polymer. Preferably, the weight percentage of the thermosetting polymer in the polymer is at least 51%, and particularly preferably at least 70%. The modified resin can be one or more of polyester resin, acrylic resin, nitrile rubber, polyolefin, polystyrene, polyamide, polycarbonate, polyallyl sulfone, polyallyl ketone, polyphenylene sulfide, polyarylate, liquid crystal polymer, and fluororesin. The modified resin plays a role in improving the mechanical properties of the thermosetting polymer, such as toughening.

[0024] The fiber fabric in the present invention can be one or more of glass fiber cloth, carbon fiber cloth, aramid fiber cloth, super-stretched polyethylene fiber cloth, ceramic fiber cloth, and metal fiber cloth. Preferably, glass fiber cloth is used. More preferably, E glass fiber cloth is used. Such material cost is relatively good, and there is a mature production coating process.

[0025] In the present invention, the content of the glass fiber cloth in the first coating is 10-70% of the total weight percentage of the coating. Such a ratio is most suitable in the coating process of the coating, and at the same time ensures that the polymer has a sufficiently high strength. Although, in principle, it is also possible to set the glass fiber cloth content to be less than 10% or greater than 70% by weight. However, the above-mentioned positive effects will be reduced as a result.

[0026] Advantageously, the thickness of the first coating is 0.1-3.0 mm. Such a thickness of the first coating helps to provide sufficient wear to increase the life of the working edge of the scraper. If it is less than 0.1 mm, the life of the working edge is not advantageous compared with the prior art. If it is greater than 3.0 mm, it is uneconomical in terms of cost and processing difficulty.

[0027] In the present invention, the additional component includes a hard filler. The hard filler includes one or more of aluminum oxide, diamond, cubic boron nitride, silicon nitride, silicon carbide, and tungsten carbide. The polymer coating with the above-mentioned additional components has high wear resistance and a long service life. At the same time, the above-mentioned hard filler can also form a good composite with the polymer in the coating. If necessary, the compatibility of the resin and the filler can be increased by physically or chemically modifying the surface of the hard filler, such as adding a compatibilizer.

[0028] In the present invention, the hard filler is a hard particle filler, and the hard particle size is 0.1-20 μm, and particularly preferably 1-5 μm. Such a size can further improve the wear resistance of the scraper of the present invention while ensuring the convenience of the coating process operation. When the filler particle size is less than 0.1 μm, the coating process is more difficult and the wear resistance is reduced; when the filler particle size is greater than 20 μm, the roughness of the scraper surface will increase, causing excessive wear on the roller.

[0029] In the present invention, the content of the hard particle filler is 10-50% of the total coating volume percentage. When the volume ratio is less than 10%, the wear resistance of the scraper is not significantly improved; when the volume ratio is greater than 50%, the coating process is more difficult.

[0030] In addition, the additional components in the present invention include lubricating particles, which can effectively reduce the sliding friction coefficient between the coating and the roller, thereby reducing the wear of the scraper and the roller.

[0031] The lubricating particles include one or more of polytetrafluoroethylene microspheres, hexagonal boron nitride, and graphene. Particularly preferably, hexagonal boron nitride and polytetrafluoroethylene microspheres are particularly suitable.

[0032] The content of the lubricating particles is 1-20% of the total volume percentage of the coating. If the volume is less than 1%, there will be no obvious lubrication effect; in principle, a volume greater than 20% is also feasible. However, too high a proportion of lubricating particles will reduce the mechanical properties of the coating.

[0033] In a preferred embodiment of the present invention, the substrate is made of steel. In the printing industry and the coating industry, steel or stainless steel is widely used as the scraper substrate, and its type is not particularly limited.

[0034] In another preferred embodiment of the present invention, the substrate is made of beryllium copper alloy. Beryllium copper alloy has the characteristics of high strength, high elasticity and fatigue resistance, and is particularly suitable for scraper substrates.

[0035] The present invention provides a favorable method for manufacturing a scraper, in particular, the method for manufacturing the scraper of the present invention, comprising the steps of: (S1) preparing a semi-cured sheet by coating thermosetting polymer (thermosetting polymer), initiator, hard filler, lubricating particles, and other additives with glass fiber cloth through vertical coating, horizontal coating, calendering, etc.; (S2) roughening one or both sides of a substrate; (S3) hot-pressing and curing at least one layer of the semi-cured sheet and the substrate, wherein the cured semi-cured sheet forms the first coating layer and is tightly attached to the substrate; (S4) forming the scraper according to the shape of the coating roller by means of striping, milling, cutting, etc.

[0036] Among them, a commonly used coating method in the first step is vertical coating (vertical glue coating). More specifically, thermosetting polymer, initiator, filler, lubricating particles and other additives are uniformly dispersed in a suitable organic solvent to produce a glue solution containing the above ingredients. The type of the suitable organic solvent depends on the thermosetting polymer system used. Then, the glue solution is coated on the glass fiber cloth in a vertical coating machine, and dried to a state of partial cross-linking reaction (B state, B-Stage) to produce the semi-cured sheet.

[0037] The purpose of roughening the substrate in the second step is to enhance the bonding ability between the substrate material and the prepreg. The roughening treatment includes but is not limited to electrochemical roughening, laser roughening, mechanical roughening, chemical reaction corrosion and other methods.

[0038] In the third step, the hot pressing curing of the substrate and the prepreg is preferably carried out in a vacuum laminator. Through vacuum hot pressing, the gas and low molecular weight substances in the polymer can be removed, so that the curing reaction is fully carried out and the pressed product has fewer defects.

[0039] The coating formed in the third step may completely cover the substrate on one side, or may cover the substrate on the upper and lower sides of the substrate. In one embodiment, the side of the substrate is not covered by the coating. However, in other embodiments, the side of the substrate may also be covered by the coating; if the side of the substrate needs to be covered, the prepreg needs to cover the edge range of the substrate in the third step.

[0040] In another method for manufacturing a scraper, the following steps are included: (S1) thermosetting polymer (thermosetting polymer), initiator, hard filler, lubricating particles, and other additives are made into a semi-cured sheet with glass fiber cloth by vertical coating, horizontal coating, calendering, etc.; (S2) at least one layer of the semi-cured sheet is hot-pressed and cured to form a hard polymer laminate; (S3) the hard polymer laminate is tightly bonded to a substrate by a thermosetting adhesive to form the scraper.

[0041] Compared with the prior art, the present invention is beneficial in that:

[0042] (1) The present invention uses steel or beryllium copper alloy as a substrate, and the scraper made of it has sufficient strength and elasticity. In addition, the present invention uses a polymer as a coating on the working edge, which reduces the running-in time between the scraper and the roller after replacing a new scraper. Compared with the high-hardness scrapers in the prior art, especially metal scrapers, the polymer coating effectively reduces the wear of the scraper working edge on the roller surface.

[0043] (2) The present invention uses a fiber fabric reinforced thermosetting polymer as a coating, and the coating contains hard fillers and lubricating particles. Compared with the polymer coating in the prior art, the coating in the present invention has higher wear resistance and better deformation resistance, and can effectively increase the working life of the polymer layer.

[0044] (3) In the prior art, coating methods are mostly used, and the thickness of the polymer layer is generally several microns to more than ten microns. The present invention adopts a lamination method, which can produce a thicker polymer coating at a lower cost, and the coating thickness can reach several hundred microns to several millimeters. The thicker polymer coating further increases the service life of the scraper and reduces the frequency of scraper replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Fig. 1(A) is a cross section of a scraper according to the present invention. Fig. 1(B) is a cross section of a scraper according to the present invention, wherein the coating is on the upper and lower surfaces of the substrate. Fig. 1(C) is a cross section of a scraper according to the present invention, wherein the coating covers the side surfaces and the upper and lower surfaces of the substrate.

[0046] Figure 2 1 (A) is a schematic diagram of the working state of the scraper of the present invention.

[0047] FIG. 3(A) is a schematic diagram of the superposition of the prepreg and the substrate in the manufacturing step of the third embodiment of the present invention; FIG. 3(B) is a schematic diagram of the structure of the manufactured laminated material.

[0048] Figure 4 It is a schematic cross-sectional view of the scraper described in Example 4 of the present invention. DETAILED DESCRIPTION

[0049] FIG1 is a schematic diagram showing three types of scrapers according to the present invention in cross section. The schematic diagram is used to help understand the structure and relative position relationship of the scraper types, but is not equivalent to the actual processing ratio.

[0050] In Figure 1, the substrate 11 is made of steel. Different coating forms can be used in different application scenarios. In Figure 1 (A), the coating 12 is located on one side of the substrate 11, and the working edge 121 in contact with the roller forms a specific angle (for example, α = 10-70 degrees), which is suitable for unidirectional rotation of the roller and continuous scraper application. In Figure 1 (B), the coating 12 is located on both sides of the substrate 11, which can be used in application scenarios where the roller rotates in both directions. In Figure 1 (C), the coating 12 covers the side of the substrate 11, which is suitable for applications that are more concerned about roller wear. Therefore, according to the use requirements of printing or coating, the present invention can adopt a more suitable coating method.

[0051] Figure 2 What is shown is a side view schematic diagram of the working state of the scraper in Figure 1 (A). Among them, the scraper 21 contacts the printing roller 22 at a specific angle. The scraper 21 includes a base 211 and a coating 212. The base 211 is steel, and the coating 212 is an epoxy resin-glass fiber cloth material. The coating 212 contains hard fillers (such as aluminum oxide) and lubricating particles (such as hexagonal boron nitride). The direction of rotation of the printing roller 22 is indicated by a solid arrow. In fact, the contact surface between the scraper and the printing roller is the coating 212. During the rotation, the glue 23 (such as printing ink) attached to the printing roller is scraped off by the scraper 21, flows along the coating 212 to the rear end and falls from the scraper.

[0052] The following is an example of a preferred specific embodiment of the present invention to illustrate the method for making the scraper provided by the present invention.

[0053] Example 1:

[0054] Add the following components in a clean container in sequence: 60 parts by mass of bisphenol A epoxy resin, 20 parts by mass of multifunctional epoxy resin, and 20 parts by mass of nitrile rubber. After the above resins are evenly mixed, add 3.2 parts by mass of dicyandiamide curing agent dissolved in dimethylformamide (DMF) and 0.04 parts by mass of curing accelerator 2-methylimidazole. Continue stirring and mixing for 1 hour to obtain pure resin glue. Add 200 parts by mass of solvent methyl ethyl ketone (MEK) to another clean container, then add 150 parts by mass of aluminum oxide particles (particle size 3 microns), stir for 20 minutes, then add 60 parts by mass of hexagonal boron nitride (particle size 3 microns), continue stirring for 20 minutes, add pure resin glue, and disperse at high speed in a vacuum emulsifier for 1 hour. Obtain a uniformly dispersed glue containing fillers and lubricating particles. The above-mentioned glue solution is used for coating, and 1080 glass fiber cloth (glass fiber cloth) is used for coating. The oven temperature is 110 degrees Celsius, and the baking time is 1.5 minutes. Semi-curing is performed to obtain the semi-cured sheet, wherein the resin mass fraction in the semi-cured sheet is controlled to be 65%, and the thickness of the semi-cured sheet is 75 microns.

[0055] The substrate is made of high elastic stainless steel foil with a thickness of 0.100 mm. The stainless steel strip is cut into sheets, and one side is degreased and cleaned, and sandblasted to form a matte surface.

[0056] The three layers of the above-mentioned prepregs and stainless steel foil are stacked in sequence, and a release film is applied to one side of the prepreg surface. The above-mentioned stacked layers are placed in a mirror stainless steel plate to form a "BOOK". The "BOOK" is placed in a vacuum hot press machine, and the hot pressing condition is 190 degrees Celsius for 90 minutes. The release film is removed to obtain a stainless steel base laminate material covered with a thermosetting epoxy resin-glass fiber coating. Among them, the coating thickness is 0.2mm and the base thickness is 0.1mm.

[0057] The above-mentioned laminated material is subjected to cutting, grinding and other mechanical processing operations according to the use requirements to obtain the sheet-type scraper, as shown in FIG. 1(A).

[0058] Example 2:

[0059] In a clean container, 80 parts by mass of bismaleimide (4,4'-diaminodiphenylmethane, DDM) prepolymer resin modified by diamine (4,4'-diaminodiphenylmethane, DDM), 0.03 parts by mass of 2-methyl-4-ethylimidazole, 20 parts by mass of bisphenol A epoxy resin, 80 parts by mass of solvent dimethylformamide (DMF) are added successively, and uniformly dispersed at room temperature until all resins are dissolved, 80 parts by mass of spherical alumina particles (average particle size 3 microns) are added successively, stirred for 20 minutes, 10 parts by mass of hexagonal boron nitride particles (average particle size 3 microns) are added, stirred for 20 minutes, and then dispersed in a high-speed disperser for 60 minutes to obtain a uniformly dispersed glue. The above-mentioned glue is used for coating, and 1080 glass fiber cloth is used for coating, the oven temperature is 155 degrees Celsius, and the baking time is 7 minutes, and the semi-cured sheet is obtained, wherein the thickness of the semi-cured sheet is 0.100mm.

[0060] The substrate is made of high elastic stainless steel foil with a thickness of 0.100 mm. The stainless steel strip is cut into sheets, and both the upper and lower surfaces are degreased and sandblasted to form a matte surface.

[0061] The "two layers of prepreg / stainless steel foil / two layers of prepreg" are stacked in sequence, and the release films are applied on the upper and lower sides, and the above stacked layers are placed in a mirror stainless steel plate to make a "BOOK". The "BOOK" is placed in a vacuum hot press, and the hot pressing condition is 220 degrees Celsius for 90 minutes. The release film is removed to obtain a stainless steel base laminate material covered with a thermosetting polyimide-glass fiber coating. Among them, the thickness of the upper and lower coatings is 0.20mm, the thickness of the base is 0.10mm, and the total thickness of the scraper is 0.50mm.

[0062] The above laminated material is cut, polished and other mechanically processed according to the use requirements to obtain a blade-type scraper as shown in FIG. 1(B).

[0063] Example 3:

[0064] In a clean container, 80 parts by mass of PPO resin modified with allyl end groups (model SA9000, Saudi Arabia basic materials), 20 parts by mass of triallyl isocyanurate (TAIC), and 50 parts by mass of solvent xylene are added in sequence, and uniformly dispersed at room temperature until all the resins are dissolved, and then 120 parts by mass of silicon carbide spherical particles (particle size 5 microns) are added in sequence, stirred for 20 minutes, 20 parts by mass of polytetrafluoroethylene microsphere particles (average particle size 5 microns) are added, stirred for 20 minutes, and 3 parts by mass of initiator (DCP) are added, and then dispersed in a high-speed disperser for 60 minutes to obtain a uniformly dispersed glue. The above-mentioned glue is used for coating, and 1080 glass fiber cloth is used for coating, the oven temperature is 110 degrees Celsius, the baking time is 3 minutes, and the semi-cured sheet is obtained by semi-curing, and the thickness of the semi-cured sheet is 0.100mm.

[0065] The substrate is made of highly elastic beryllium copper alloy foil with a thickness of 0.150 mm. The beryllium copper alloy foil is cut into strips, and both the upper and lower surfaces are degreased, cleaned, and polished to form a matte surface.

[0066] The "two layers of semi-cured sheets / beryllium copper alloy strip foil / two layers of semi-cured sheets" are stacked in sequence, and release films are applied on the upper and lower sides. The above stacked layers are placed in a mirror stainless steel plate to form a "BOOK". Among them, the side view of the stacked structure is shown in Figure 3 (A). The middle layer is a beryllium copper alloy strip 31, and the upper and lower three layers of semi-cured sheets 32 and the three layers of semi-cured sheets 33 are the same size and overlap each other; one side edge 321 thereof exceeds the edge 311 of the beryllium copper alloy foil, and the width of the excess edge is d = 10mm. The outer layer is a release film 34. The "BOOK" is placed in a vacuum hot press, and the hot pressing conditions are hot pressing at 220 degrees Celsius for 90 minutes. The release film is removed to obtain a laminated material as shown in Figure 3 (B). Due to the fluidity of the semi-cured sheet, the polymer coating 35 in the laminated material can not only cover the upper and lower sides of the base layer, but also cover the side edges of the base layer 36.

[0067] The above laminated material is subjected to cutting, grinding and other mechanical processing operations according to the use requirements to obtain a sheet-type scraper as shown in Figure 1 (C).

[0068] Example 4:

[0069] Example 4 shows another method for making the scraper of the present invention. The preparation of the semi-cured sheet in Example 4 is the same as that in Example 1. Afterwards, three layers of epoxy resin-glass fiber cloth semi-cured sheets are stacked in sequence, and release films are coated on both sides. The above stacked layers are placed in a mirror stainless steel plate to form a "BOOK". The "BOOK" is placed in a vacuum hot press, and the hot pressing conditions are 190 degrees Celsius for 90 minutes. The release film is removed to obtain a thermosetting epoxy resin-glass fiber laminate with a thickness of 0.20 mm.

[0070] The substrate is made of high elastic stainless steel foil with a thickness of 0.10 mm. The stainless steel strip is cut into strips, and one side is degreased and cleaned, and sandblasted to form a matte surface.

[0071] Cut the epoxy resin-fiberglass laminate into strips and bond them to the rough surface of the stainless steel strip using thermosetting epoxy resin glue. During bonding, the strip laminate can completely cover one side of the stainless steel strip and extend beyond the edge of the substrate. Figure 4 As shown, the edge 421 of the laminate 42 extends beyond the edge 411 of the substrate 41, and the extension distance is d2 = 2.0 mm. The working edge of the scraper 4 is the laminate. In the working state, one side of the laminate 42 contacts the roller and moves in the direction of rotation of the roller. Figure 4The scraper structure shown has similar beneficial effects to the scraper structure shown in Figure 1 (C), and is suitable for application scenarios where the focus is on reducing the wear of the scraper on the surface of the printing roller and a low-hardness working edge scraper is preferred.

[0072] As shown in the experiment, the scrapers listed in Examples 1-4 have good wear resistance and stability, and can effectively scrape the glue on the roller without streaks or uneven color blocks throughout the service life of the scraper; after replacing the new scraper, its running-in time is significantly shorter than that of ordinary carbon steel scrapers and other carbide scrapers; in continuous high-speed, long-term wear experiments, the above-mentioned scrapers also have better wear on the roller than ordinary carbon steel scrapers and other carbide scrapers.

[0073] The above-mentioned scraper structure diagram and manufacturing method should only be understood as illustrative examples and can be arbitrarily changed within the scope of the present invention. For example, the shape of the coating and the substrate can also be changed by means of mechanical processing, and in particular, the working edge of the coating can be chamfered or rounded to give it a specific shape. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. An ink scraper manufactured by lamination method, characterized in that: The invention comprises a flat and elongated substrate and a first coating layer with a polymer-fiber fabric as a main material covering at least one side thereof, wherein the first coating layer contains at least one additional component for improving the wear resistance of the coating layer; the first coating layer is a laminated material formed by laminating and curing a semi-cured sheet with a main material of a thermosetting polymer and a fiber fabric; The ink scraper uses steel or beryllium copper alloy as a substrate, and heat-presses and solidifies at least one prepreg with the substrate or tightly bonds a hard polymer laminate with the substrate, wherein heat-presses and solidifies at least one prepreg to form a hard polymer laminate; The thickness of the first coating is 0.1-3.0 mm; The thermosetting polymer includes one or more of a thermosetting epoxy resin polymer, a thermosetting polyimide polymer, and a thermosetting polyphenylene ether polymer; The thermosetting epoxy resin polymer refers to a polymer with a three-dimensional network structure formed by a chemical reaction between a type of macromolecule containing two or more epoxy groups in the molecular structure and a curing agent; the epoxy resin is one or more of bisphenol A epoxy resin, brominated epoxy resin, novolac epoxy resin, multifunctional epoxy resin, phenoloxy resin, brominated phenoloxy resin; the curing agent is one or more of aliphatic polyamine, aromatic amine, dicyandiamide, anhydride curing agent, linear phenolic resin, polysulfide rubber; The thermosetting polyimide polymer refers to a network structure polymer synthesized with bismaleimide as the basic monomer; the bismaleimide is one or more of diamine-modified bismaleimide, epoxy resin-modified bismaleimide, allylphenyl compound-modified bismaleimide, thermoplastic resin-modified bismaleimide, cyanate-modified bismaleimide, and triallyl isocyanurate-modified bismaleimide; The thermosetting polyphenylene ether polymer refers to a polymer having a bulk network structure formed by reacting a thermosetting modified polyphenylene ether resin as the main resin with a curing agent; the thermosetting modified polyphenylene ether resin is one or more of a polyolefin-modified polyphenylene ether resin, an epoxy-modified polyphenylene ether resin, a triallyl isocyanurate-modified polyphenylene ether, a cyanate-modified polyphenylene ether resin, a BT resin-modified polyphenylene ether resin, and a polyphenylene ether resin with allyl active groups modified on the polyphenylene ether molecular structure.

2. The ink scraper according to claim 1, characterized in that: The polymer comprises a major portion consisting of one or more thermosetting polymers and a minor portion consisting of one or more modified resins; The thermosetting polymer is one or more of a thermosetting epoxy resin polymer, a thermosetting polyimide polymer, and a thermosetting polyphenylene ether polymer; The weight percentage of the thermosetting polymer in the polymer is at least 51%; The modified resin is one or more of polyester resin, acrylic resin, nitrile rubber, polyolefin, polystyrene, polyamide, polycarbonate, polyallyl sulfone, polyallyl ketone, polyphenylene sulfide, polyarylate, liquid crystal polymer, and fluororesin.

3. The ink scraper according to claim 1, characterized in that: The fiber fabric is one or more of glass fiber fabric, carbon fiber fabric, aramid fiber fabric, super-stretched polyethylene fiber fabric, ceramic fiber fabric, and metal fiber fabric.

4. The ink scraper according to claim 1 or 3, characterized in that: The content of the fiber fabric in the first covering layer is 10-70% of the total mass percentage of the covering layer.

5. The ink scraper according to claim 1, characterized in that: The additional ingredients include hard fillers; The hard filler includes one or more of alumina, diamond, cubic boron nitride, silicon nitride, silicon carbide, and tungsten carbide; The particle size of the hard filler is 0.1-20 μm; The content of the hard filler is 10-50% of the total volume percentage of the coating.

6. The ink scraper according to claim 1, characterized in that: The additional ingredients include lubricating particles; The lubricating particles include one or more of polytetrafluoroethylene microspheres, hexagonal boron nitride, and graphene; The content of the lubricating particles is 1-20% of the total volume percentage of the coating.

7. A method for manufacturing an ink scraper as claimed in any one of claims 1 to 6, characterized in that: The following steps are included: S1. The thermosetting polymer, initiator, hard filler, lubricating particles, and other additives are made into a prepreg by vertical coating, horizontal coating or calendar coating with a fiber fabric; S2. roughening one or both sides of the substrate; S3. The at least one layer of prepreg and the substrate are heat-pressed and cured, and the cured prepreg forms the first coating, which is closely attached to the substrate; S4. The scraper is shaped according to the shape of the coating roller by striping, milling or cutting.

8. A method for manufacturing an ink scraper as claimed in any one of claims 1 to 6, characterized in that: The following steps are included: S1. Preparing a prepreg by vertical coating, horizontal coating or calendar coating of a thermosetting polymer, an initiator, a hard filler, lubricating particles, and other additives with a fiber fabric; S2. hot pressing and curing at least one layer of the prepreg to produce a rigid polymer laminate; S3. The rigid polymer laminate is tightly bonded to the substrate by a thermosetting adhesive; S4. The scraper is shaped according to the shape of the coating roller by striping, milling or cutting.

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