A method of manufacturing a flight

Abstract

This invention belongs to the field of molding technology for laser imaging office equipment components, specifically a method for manufacturing a scraper. The scraper manufacturing method provided by this invention includes the following steps: S1 film molding; S2 removing the film, cleaning it to remove impurities and release agent from the film surface, obtaining a clean film; S3 preparing a coating according to the formula requirements; S4 uniformly applying the coating prepared in step S3 to the working position of the clean film obtained in step S2, obtaining a coated product; S5 drying the coated product obtained in step S4 to obtain a cured product, and cutting or slitting the cured product; S6 pasting the cut or slitting cured product from step S5 onto a metal bracket. The scraper manufacturing method provided by this invention, by coating a functional coating onto the PU film after molding, produces products with high qualification rates, strong versatility, reduced R&D costs, and increased product functionality.

Description

Technical Field

[0001] This invention belongs to the field of molding technology for laser imaging office equipment parts, and in particular, a method for manufacturing a scraper. Background Technology

[0002] The function of the scraper in laser imaging office equipment is to clean residual developer on the surface of the developer unit (photosensitive drum, etc.), or to control the thickness and uniformity of the developer layer on the developer unit and the electric charge generated by friction. The scraper is generally composed of a metal bracket and a single layer of PU material film.

[0003] Chinese patent application CN100480890A discloses a cleaning scraper element containing a polyurethane formed by using the following substances: a polyhydroxy compound comprising at least one polyester-type polyhydroxy compound, caprolactone diol and polycarbonate diol, wherein the polyester-type polyhydroxy compound is obtained by dehydration condensation of adipic acid and diol components, a polyisocyanate, and a crosslinking agent comprising a short-chain diol and a triol having a molecular weight of 120-2,500, wherein the short-chain diol is at least one of propylene glycol and butanediol, and wherein the polyurethane has a peak temperature of 0°C or lower loss tangent (1 Hz).

[0004] Chinese patent application CN102467059A discloses a cleaning squeegee used in an image forming apparatus employing an electrostatic transfer process. The cleaning squeegee, which incorporates a polyurethane elastomer, is prepared by reacting an isocyanate-containing pseudo-prepolymer, a polyol compound, and a curing agent. The isocyanate-containing pseudo-prepolymer is prepared by reacting a diisocyanate compound with polycaprolactone diol (P1) having a number average molecular weight (Mw) of 2000–4000. The polyol compound is prepared by mixing at least the polycaprolactone diol (P1) with polycaprolactone diol (P2) having a number average molecular weight (Mw) of 500–1000, resulting in a number average molecular weight (Mw) of 1500–1950 for the mixture.

[0005] Ordinary PU film's cleaning ability, or its control over developer thickness, uniformity, and charge, can only be determined by the properties of its material itself. Due to limitations in raw materials and molding processes, the surface properties of PU film are difficult to adjust. Currently, various toner cartridges on the market have different requirements for squeegees, resulting in poor product versatility and difficulties for manufacturers in developing compatible solutions. Especially now, with the trend towards miniaturization, high speed, and long lifespan in laser imaging office equipment, the adaptability requirements for squeegees are becoming increasingly stringent. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a method for manufacturing a scraper. The scraper manufacturing method provided by the present invention, by adding a uniform functional coating to one or both sides of the PU film after molding, produces products with high yield, strong versatility, reduced R&D costs, and increased product functionality, giving it good conductivity, wear resistance, and lubricity.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0008] A method for manufacturing a scraper includes the following steps:

[0009] S1 film molding: After the PU material is mixed evenly, it is poured into a centrifuge or a mold with a support, and then heated and cured to form the film.

[0010] S2 Removes the film from the centrifuge or the film with a support from the mold, cleans it to remove impurities and release agent from the film surface, and obtains a clean film.

[0011] S3. Prepare the coating according to the formula requirements. The weight ratio of the coating to the PU material mentioned in step S1 is 0.5-10:85-98.

[0012] S4. The coating prepared in step S3 is evenly applied to the working position of the cleaning film obtained in step S2 to obtain the coated product.

[0013] S5. Place the coated product obtained in step S4 into an oven at 100-150℃ and dry it for 10-30 minutes to obtain a cured product. Cut or slit the cured product.

[0014] S6. Adhere the cured material after cutting or slicing in step S5 onto the metal bracket.

[0015] Further, in step S3, the weight ratio of the coating to the PU material in step S1 is (1-5):(95-98).

[0016] Furthermore, in step S3, the weight ratio of the coating to the PU material in step S1 is 2:98.

[0017] Furthermore, the coating method in step S4 is spraying, dipping, or brushing.

[0018] Further, in step S5, the coated product obtained in step S4 is placed in an oven at 110-130°C for drying.

[0019] Furthermore, the drying time in step S5 is 15-25 minutes.

[0020] Further, the PU material in step S1 comprises the following components and their weight percentages: 65-95% polyurethane prepolymer, 0-30% polyester polyol resin, 5-12% curing agent, 0-5% conductive agent, and 0-5% lubricant.

[0021] Furthermore, the PU material in step S1 comprises the following components and their weight percentages: 70% polyurethane prepolymer, 20% polyester polyol resin, 6% curing agent, 2% conductive agent, and 2% lubricant.

[0022] Further, the curing agent is 1,3-propanediol, 1,4-butanediol, trimethylolpropane, trimethylolethane, and mixtures thereof.

[0023] Furthermore, the conductive agent is silver powder, zinc oxide, or tin trioxide.

[0024] Furthermore, the lubricant is molybdenum disulfide or silicon dioxide.

[0025] Further, the coating in step S3 comprises the following components and their weight percentages: 54.97-65.49% deionized water, 25-30% abrasive particles, 2-3% polycarboxylate dispersant, 5-8% polyvinyl alcohol, 2-3% thickener, 0.5-1% attapulgite clay, and 0.01-0.03% defoamer.

[0026] Furthermore, the coating in step S3 comprises the following components and their weight percentages: 59.48% deionized water, 28% abrasive particles, 2.5% polycarboxylate dispersant, 7% polyvinyl alcohol, 2.2% thickener, 0.8% attapulgite clay, and 0.02% defoamer.

[0027] Furthermore, the abrasive particles are one or more of silicon dioxide, aluminum oxide, or carbon black, and the particle size of the abrasive particles is 200nm-20μm.

[0028] Furthermore, the thickener is hydroxyethyl cellulose.

[0029] Furthermore, the defoamer is isooctanol.

[0030] The method for preparing the coating in step S3 includes the following steps:

[0031] (1) Take half of the deionized water, add polyvinyl alcohol, heat to 65-75℃, and stir until completely dissolved to obtain solution A;

[0032] (2) Add abrasive particles and attapulgite clay to the remaining deionized water and stir well to obtain material B;

[0033] (3) Mix the solution A obtained in step (1) and the material B obtained in step (2), add polycarboxylate dispersant, thickener and defoamer, stir at a speed of 800-1000 r / min for 40-60 minutes, and the solution is obtained.

[0034] Further, step (1) involves heating to 70°C.

[0035] Furthermore, the stirring speed in step (3) is 900 r / min.

[0036] Furthermore, the stirring time in step (3) is 50 minutes.

[0037] In this invention, the PU material includes polyurethane prepolymer, curing agent, conductive agent, and lubricant, etc., and the coating is prepared from abrasive microparticles, polycarboxylate dispersant, polyvinyl alcohol, thickener, and attapulgite, etc. The scraper manufacturing method provided by this invention, by adding a uniform functional coating to one or both sides of the PU film after molding, results in a high product qualification rate, strong versatility, reduced R&D costs, and increased product functionality, giving it good conductivity, wear resistance, and lubricity.

[0038] Compared with the prior art, the scraper manufacturing method provided by the present invention has the following advantages:

[0039] (1) The scraper manufacturing method provided by the present invention is simple and effective.

[0040] (2) The manufacturing method of the scraper provided by this invention results in a high product qualification rate. Existing films often exhibit surface defects during the molding process, which can lead to abnormalities in the printed artwork. However, the manufacturing method of the scraper provided by this invention can compensate for these defects through a coating, providing better quality assurance for the product.

[0041] (3) The squeegee manufacturing method provided by this invention can increase the versatility of products and reduce R&D costs. Traditional films require their own materials to provide the necessary cleaning capabilities and developer control. Due to the wide variety of toner cartridges on the market and their poor versatility, each product requires the development of a new film formula, which may necessitate new processes, resulting in high R&D costs and difficult production control. However, the squeegee manufacturing method provided by this invention can unify several film formulas, allowing for versatility across multiple products simply by changing the surface coating, significantly reducing R&D and production control costs.

[0042] (4) The products manufactured using the scraper manufacturing method provided by this invention have strong functionality. Existing films, due to limitations in their materials, cannot meet customer requirements in terms of functionality, especially for new high-speed, long-life products. However, the scraper manufacturing method provided by this invention can maintain the physical properties of the film itself while providing new functional surfaces, such as improved conductivity, wear resistance, and lubricity, thus meeting or even exceeding a range of customer functional requirements. Detailed Implementation

[0043] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the scope of the present invention.

[0044] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0045] Example 1: A method for manufacturing a scraper

[0046] The method for manufacturing the scraper includes the following steps:

[0047] S1 film molding: After the PU material is mixed evenly, it is poured into a centrifuge and heated to cure and form the film;

[0048] S2 removes the film from the centrifuge, cleans it to remove impurities and release agent from the film surface, and obtains a clean film.

[0049] S3. Prepare the coating according to the formula requirements. The weight ratio of the coating to the PU material mentioned in step S1 is 0.5:98.

[0050] S4. The coating prepared in step S3 is evenly applied to the working position of the cleaning film obtained in step S2. The coating method is dip coating, and the coated product is obtained.

[0051] S5. Place the coated product obtained in step S4 into an oven at 100°C and dry it for 10 minutes to obtain a cured product. Cut the cured product.

[0052] S6. Adhere the cured material cut in step S5 onto the metal bracket.

[0053] The PU material in step S1 consists of the following components and their weight percentages: 65% polyurethane prepolymer, 30% polyester polyol resin, and 5% curing agent; the curing agent is 1,3-propanediol.

[0054] The coating in step S3 consists of the following components and their weight percentages: 65.49% deionized water, 25% abrasive microparticles, 2% polycarboxylate dispersant, 5% polyvinyl alcohol, 2% thickener, 0.5% attapulgite clay, and 0.01% defoamer; the abrasive microparticles are silica with a particle size of 200 nm; the thickener is hydroxyethyl cellulose; and the defoamer is isooctanol.

[0055] The method for preparing the coating in step S3 includes the following steps:

[0056] (1) Take half of the deionized water, add polyvinyl alcohol, heat to 65°C, and stir until completely dissolved to obtain solution A;

[0057] (2) Add abrasive particles and attapulgite clay to the remaining deionized water and stir well to obtain material B;

[0058] (3) Mix the solution A obtained in step (1) and the material B obtained in step (2), add polycarboxylate dispersant, thickener and defoamer, stir at a speed of 800 r / min for 40 minutes to obtain the solution.

[0059] Example 2: A method for manufacturing a scraper

[0060] The method for manufacturing the scraper includes the following steps:

[0061] S1 film molding: After the PU material is mixed evenly, it is poured into a mold with a support frame and heated to cure and form.

[0062] S2 removes the film with support from the mold, cleans it to remove impurities and release agent from the surface of the film, and obtains a clean film.

[0063] S3 prepares the coating according to the formula requirements, and the weight ratio of the coating to the PU material in step S1 is 10:85;

[0064] S4. The coating prepared in step S3 is evenly applied to the working position of the cleaning film obtained in step S2 by brushing to obtain the coated product.

[0065] S5. Place the coated product obtained in step S4 into an oven at 150°C and dry it for 30 minutes to obtain a cured product. Cut the cured product into pieces.

[0066] S6. Adhere the cured material after being cut in step S5 onto the metal bracket.

[0067] The PU material in step S1 consists of the following components and their weight percentages: 95% polyurethane prepolymer and 5% curing agent; the curing agent is trimethylolpropane.

[0068] The coating described in step S3 comprises the following components and their weight percentages: 54.97% deionized water, 30% abrasive microparticles, 3% polycarboxylate dispersant, 8% polyvinyl alcohol, 3% thickener, 1% attapulgite clay, and 0.03% defoamer; the abrasive microparticles are composed of alumina and carbon black in a weight ratio of 2:5, and the particle size of the abrasive microparticles is 20 μm; the thickener is hydroxyethyl cellulose; and the defoamer is isooctanol.

[0069] The method for preparing the coating in step S3 includes the following steps:

[0070] (1) Take half of the deionized water, add polyvinyl alcohol, heat to 75°C, and stir until completely dissolved to obtain solution A;

[0071] (2) Add abrasive particles and attapulgite clay to the remaining deionized water and stir well to obtain material B;

[0072] (3) Mix the solution A obtained in step (1) and the material B obtained in step (2), add polycarboxylate dispersant, thickener and defoamer, stir at a speed of 1000 r / min for 60 minutes to obtain the solution.

[0073] Example 3: A method for manufacturing a scraper

[0074] The method for manufacturing the scraper includes the following steps:

[0075] S1 film molding: After the PU material is mixed evenly, it is poured into a centrifuge and heated to cure and form the film;

[0076] S2 removes the film from the centrifuge, cleans it to remove impurities and release agent from the film surface, and obtains a clean film.

[0077] S3 prepares the coating according to the formula requirements, and the weight ratio of the coating to the PU material in step S1 is 2:98;

[0078] S4. The coating prepared in step S3 is evenly applied to the working position of the cleaning film obtained in step S2 by spraying to obtain the coated product.

[0079] S5. Place the coated product obtained in step S4 into an oven at 120°C and dry it for 20 minutes to obtain a cured product. Cut the cured product.

[0080] S6. Adhere the cured material cut in step S5 onto the metal bracket.

[0081] The PU material in step S1 consists of the following components and their weight percentages:

[0082] The composition includes 65% polyurethane prepolymer, 13% polyester polyol resin, 12% curing agent, 5% conductive agent, and 5% lubricant; the curing agent is composed of 1,4-butanediol and trimethylolethane in a weight ratio of 2:5; the conductive agent is tin trioxide; and the lubricant is molybdenum disulfide.

[0083] The coating described in step S3 comprises the following components and their weight percentages: 59.48% deionized water, 28% abrasive microparticles, 2.5% polycarboxylate dispersant, 7% polyvinyl alcohol, 2.2% thickener, 0.8% attapulgite clay, and 0.02% defoamer; the abrasive microparticles are composed of silica, alumina, and carbon black in a weight ratio of 1:2:4, and the particle size of the abrasive microparticles is 500 nm; the thickener is hydroxyethyl cellulose; and the defoamer is isooctanol.

[0084] The method for preparing the coating in step S3 includes the following steps:

[0085] (1) Take half of the deionized water, add polyvinyl alcohol, heat to 70°C, and stir until completely dissolved to obtain solution A;

[0086] (2) Add abrasive particles and attapulgite clay to the remaining deionized water and stir well to obtain material B;

[0087] (3) Mix the solution A obtained in step (1) and the material B obtained in step (2), add polycarboxylate dispersant, thickener and defoamer, stir at a speed of 900 r / min for 50 minutes, and the mixture is obtained.

[0088] Test Example 1: Scraper Wear Test

[0089] 1. Experimental materials: scrapers prepared in Examples 1, 2 and 3.

[0090] 2. Test method: The wear test was conducted in accordance with the industry standard JB / T10934-2010 "Technical conditions for cleaning scrapers for photoconductor drums of digital copiers and laser printers".

[0091] 3. Test Results

[0092] The experimental results are shown in Table 1.

[0093] Table 1: Abrasion test results of scrapers

[0094]

[0095]

[0096] The Shore hardness scale was used to measure the wear value. This standard wear value represents the amount of wear on the scraper without a coating at different hardness indices. The percentage value represents the difference in product weight before and after the test relative to the product weight before the test. Table 1 shows that the scrapers prepared in Examples 1, 2, and 3 all meet industry standards, and their wear values ​​are far lower than the standard values. This indicates that the scraper manufactured using the scraper manufacturing method provided by this invention can achieve excellent wear resistance. Furthermore, the scraper manufactured using the scraper manufacturing method provided by this invention exhibits good electrical conductivity, wear resistance, and lubricity.

[0097] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a scraper, characterized in that, Includes the following steps: S1 film molding: After the PU material is mixed evenly, it is poured into a centrifuge or a mold with a support, and then heated and cured to form the film. S2 Removes the film from the centrifuge or the film with a support from the mold, cleans it to remove impurities and release agent from the film surface, and obtains a clean film. S3. Prepare the coating according to the formula requirements. The weight ratio of the coating to the PU material mentioned in step S1 is 0.5-10:85-98. S4. The coating prepared in step S3 is evenly applied to the working position of the cleaning film obtained in step S2 to obtain the coated product. S5. Place the coated product obtained in step S4 into an oven at 100-150℃ and dry it for 10-30 minutes to obtain a cured product. Cut or slit the cured product. S6. Adhere the cured material after cutting or slicing in step S5 onto the metal bracket; The PU material in step S1 comprises the following components and their weight percentages: 65-95% polyurethane prepolymer, 0-30% polyester polyol resin, 5-12% curing agent, 0-5% conductive agent, and 0-5% lubricant. The coating described in step S3 comprises the following components and their weight percentages: 54.97-65.49% deionized water, 25-30% abrasive particles, 2-3% polycarboxylate dispersant, 5-8% polyvinyl alcohol, 2-3% thickener, 0.5-1% attapulgite clay, and 0.01-0.03% defoamer.

2. The method for manufacturing a scraper as described in claim 1, characterized in that, In step S3, the weight ratio of the coating to the PU material in step S1 is (1-5):(95-98).

3. The method for manufacturing a scraper as described in claim 1, characterized in that, The coating method in step S4 is spraying, dipping, or brushing.

4. The method for manufacturing a scraper as described in claim 1, characterized in that, In step S5, the coated product obtained in step S4 is placed in an oven at 110-130°C for drying; the drying time is 15-25 minutes.

5. The method for manufacturing a scraper as described in claim 1, characterized in that, The PU material in step S1 consists of the following components and their weight percentages: 70% polyurethane prepolymer, 20% polyester polyol resin, 6% curing agent, 2% conductive agent, and 2% lubricant.

6. The method for manufacturing a scraper as described in claim 1, characterized in that, The curing agent is 1,3-propanediol, 1,4-butanediol, trimethylolpropane, trimethylolethane, and mixtures thereof; the conductive agent is silver powder, zinc oxide, or tin trioxide; and the lubricant is molybdenum disulfide or silicon dioxide.

7. The method for manufacturing a scraper as described in claim 1, characterized in that, The coating described in step S3 consists of the following components and their weight percentages: 59.48% deionized water, 28% abrasive particles, 2.5% polycarboxylate dispersant, 7% polyvinyl alcohol, 2.2% thickener, 0.8% attapulgite clay, and 0.02% defoamer.

8. The method for manufacturing a scraper as described in claim 1, characterized in that, The abrasive particles are one or more of silicon dioxide, alumina, or carbon black, and the particle size of the abrasive particles is 200nm-20μm; the thickener is hydroxyethyl cellulose; and the defoamer is isooctanol.

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