A rubber roller forming process for printer

Abstract

The invention relates to the technical field of rubber roller molding, and specifically discloses a rubber roller molding process for a printer. The invention improves the ratio of rubber raw materials and optimizes the mixing process of the raw materials, thereby improving the heat resistance of the rubber roller; by performing multiple curing molding between a rubber tube and a core shaft, the bonding strength between the core shaft and the rubber tube is improved, thereby ensuring the structural stability of the rubber roller; by optimizing the surface of the rubber tube and spraying a wear-resistant coating, the wear resistance of the rubber roller is improved, thereby extending its service life; and solves the problem of loose adhesion between the core shaft and the rubber in the prior art, and the problem that the wear resistance of the rubber roller is poor and the printer rubber roller needs to be frequently replaced.

Description

Technical Field

[0001] The invention relates to the technical field of rubber roller molding, and in particular to a rubber roller molding process for a printer. Background Art

[0002] The rubber roller is an important accessory on the printer and has a significant impact on the quality of printed products. With the increasingly fierce competition in the cultural printing market, the requirements for the quality of printed products are constantly increasing, and the number of high-end high-speed printing presses is also increasing. The quality requirements for the printing rubber rollers that match the printing presses are getting higher and higher. At present, among the rubber rollers used by printing plants, due to the different molding processes used in the manufacturing of the rubber rollers, there may be a situation where the core shaft and the rubber are not tightly bonded, which affects the structural stability and service life of the rubber rollers; moreover, the wear resistance of the rubber rollers is poor. Generally, when the number of printed pages is between 2,000 and 3,000 pages, the printer rubber roller needs to be replaced. Frequent replacement of the rubber roller not only affects the printing efficiency, but also increases the printing cost.

[0003] Therefore, it is urgent to provide a rubber roller forming process for a printer to improve the performance and service life of the printer rubber roller. Summary of the invention

[0004] The purpose of the present invention is to provide a rubber roller forming process for a printer to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a rubber roller forming process for a printer, comprising the following steps:

[0006] S1, raw material selection, mixing the selected raw materials and then kneading them, and filtering the impurities in the rubber compound after kneading;

[0007] S2, using an extruder to extrude the mixed rubber material into a hose, and putting the hose into a vulcanizing tank for vulcanization and shaping;

[0008] S3, cutting the finalized hose and installing the mandrel;

[0009] S4, putting the rubber hose with the mandrel into an oven for forming to obtain a preliminary rubber roller;

[0010] S5. According to the length of the rubber hose required by the rubber roller, the two ends of the rubber hose are cut and removed, and the two ends of the mandrel are polished;

[0011] S6. Use a measuring instrument to perform precision inspection on the size of the polished mandrel;

[0012] S7, placing the rubber roller that has passed the inspection into a cleaning tank for cleaning, and drying the cleaned rubber roller;

[0013] S8, putting the dried rubber roller into a UV machine to optimize the surface of the rubber hose;

[0014] S9, spraying a wear-resistant coating on the surface of the optimized hose, and putting it into an oven for curing and shaping;

[0015] S10, performing platform rolling inspection on the rubber roller, and packaging the rubber rollers that pass the inspection, thereby completing the molding of the rubber rollers.

[0016] Preferably, in the step S1, the raw materials are selected from a composition, in parts by weight, comprising: 30-50 parts of nitrile rubber, 25-50 parts of epichlorohydrin rubber, 55-75 parts of butadiene rubber, 5 parts of activated zinc oxide, 1-2 parts of stearic acid, 15-30 parts of quick-extrusion carbon black, 5-10 parts of conductive carbon black, 10-15 parts of activated calcium carbonate, 3-10 parts of paraffin oil, 5-15 parts of cyclohexane oil, 2 parts of light stabilizer, 1 part of accelerator DM, 1.2 parts of accelerator DT, 0.8 parts of accelerator 29-50 and 1.5 parts of sulfur.

[0017] Preferably, in the step S1, the selected raw materials are mixed and then kneaded, wherein the specific kneading process is:

[0018] Add nitrile rubber, epichlorohydrin rubber and butadiene rubber into the mixing chamber in sequence, the temperature of the mixing chamber is 50℃~70℃, and plasticate for 15 minutes;

[0019] Add active zinc oxide, stearic acid and active calcium carbonate and mix for 5 minutes;

[0020] Add conductive carbon black and light stabilizer and mix for 10 minutes;

[0021] Add quick-pressed carbon black and 50% naphthenic oil and mix for 5 minutes;

[0022] Add 50% paraffin oil and mix for 5 minutes, and lower the temperature to 100℃~105℃;

[0023] Add the remaining naphthenic oil and paraffin oil and mix for 10 minutes;

[0024] When the temperature of the mixing chamber reaches 130°C, the rubber material is discharged.

[0025] Preferably, before the step S2, the rubber material after the internal mixing is placed in a rubber mixer for cooling and sheeting, and the sheeted rubber material is cut into strips.

[0026] Preferably, in step S2, the extruder is a four-stage extruder, and the extrusion temperatures are 75°C, 65°C, 55°C, and 45°C from the die head; the extrusion speed is 5.00-6.00 / rpm; and the outer diameter of the extruded hose is 9.70mm-10.30mm.

[0027] Preferably, in the step S2, when the hose is placed in a vulcanization tank for vulcanization and shaping, the pressure in the vulcanization tank is 0.48 MPa to 0.52 MPa, the temperature is 155° C. to 160° C., and the vulcanization time is 60 min to 120 min.

[0028] Preferably, in the step S4, the rubber roller has a rubber hose hardness of 57HRC to 63HRC, a rubber hose volume resistance of 0.20MΩ to 2.00MΩ, and a surface roughness of not less than 0.80μm.

[0029] Preferably, in step S5, the diameter of the polished mandrel is 8.52 mm to 8.55 mm, and the curvature of the mandrel is 0.15 mm to 0.19 mm.

[0030] Preferably, in the step S8, the UV time is 16 seconds, the UV temperature is 80° C. to 100° C., and the output speed is 4 m / min.

[0031] Preferably, in the step S9, the amount of the wear-resistant coating of a single rubber roller is 25 mg to 40 mg; the oven curing temperature is 120° C., and the curing time is 40 min.

[0032] Compared with the prior art, the present invention has the following advantages and technical effects:

[0033] The rubber roller forming process for a printer provided by the present invention improves the ratio of rubber raw materials and optimizes the mixing process of the raw materials, thereby improving the heat resistance of the rubber roller; by performing multiple curing molding between the rubber tube and the core shaft, the bonding strength between the core shaft and the rubber tube is improved, thereby ensuring the structural stability of the rubber roller; by optimizing the surface of the rubber tube and spraying a wear-resistant coating, the wear resistance of the rubber roller is improved, thereby extending its service life. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention provides a rubber roller forming process for a printer, comprising the following steps:

[0036] S1. Raw materials selection: the raw materials are selected to have a composition, in parts by weight, including: 30-50 parts of nitrile rubber, 25-50 parts of epichlorohydrin rubber, 55-75 parts of butadiene rubber, 5 parts of active zinc oxide, 1-2 parts of stearic acid, 15-30 parts of quick-extrusion carbon black, 5-10 parts of conductive carbon black, 10-15 parts of active calcium carbonate, 3-10 parts of paraffin oil, 5-15 parts of cyclohexane oil, 2 parts of light stabilizer, 1 part of accelerator DM, 1.2 parts of accelerator DT, 0.8 parts of accelerator 29-50 and 1.5 parts of sulfur; the selected raw materials are mixed and then banburying is performed. The specific banburying process is as follows:

[0037] Add nitrile rubber, epichlorohydrin rubber and butadiene rubber into the mixing chamber in sequence, the temperature of the mixing chamber is 50℃~70℃, and plasticate for 15 minutes;

[0038] Add active zinc oxide, stearic acid and active calcium carbonate and mix for 5 minutes;

[0039] Add conductive carbon black and light stabilizer and mix for 10 minutes;

[0040] Add quick-pressed carbon black and 50% naphthenic oil and mix for 5 minutes;

[0041] Add 50% paraffin oil and mix for 5 minutes, and lower the temperature to 100℃~105℃;

[0042] Add the remaining naphthenic oil and paraffin oil and mix for 10 minutes;

[0043] When the temperature of the mixing chamber reaches 130°C, the rubber material is discharged;

[0044] And filter the impurities in the rubber compound after mixing;

[0045] S2. Use an extruder to extrude the mixed rubber material into a hose. The extruder adopts a four-stage extruder. The extrusion temperatures are 75°C, 65°C, 55°C, and 45°C from the die head. The extrusion speed is 5.00-6.00 / rpm. The outer diameter of the extruded hose is 9.70mm-10.30mm. The hose is placed in a vulcanizing tank for vulcanization and shaping. The pressure in the vulcanizing tank is 0.48MPa-0.52MPa, the temperature is 155°C-160°C, and the vulcanization time is 60min-120min.

[0046] S3. Cut the finalized hose to a length of 240.00mm to 244.00mm, and install the mandrel. Before installing the mandrel, check whether there is rust, burrs, or bruises on the appearance of the mandrel. The length of the mandrel is controlled to be 252.30mm to 252.70mm, and try to ensure that the exposed lengths at both ends of the mandrel are consistent, so as to facilitate the subsequent cutting and pulling operations of the hose.

[0047] S4, putting the rubber hose with the mandrel into an oven for forming to obtain a preliminary rubber roller, the parameters of which are as follows: the hardness of the rubber hose is 57HRC-63HRC, the volume resistance of the rubber hose is 0.20MΩ-2.00MΩ, and the surface roughness of the rubber hose is not less than 0.80μm;

[0048] S5. According to the required length of the rubber hose of the rubber roller, the two ends of the rubber hose are cut and removed to control the total length of the rubber hose to be 228.10mm-228.90mm. The length of the mandrel exposed at both ends of the rubber hose is the same, and the two ends of the mandrel are polished. The diameter of the polished mandrel is 8.52mm-8.55mm, and the mandrel camber is 0.15mm-0.19mm.

[0049] S6. Use a measuring instrument to perform precision inspection on the size of the polished mandrel;

[0050] S7. Place the rubber roller that has passed the inspection on a tray and put it into a cleaning tank for two cleanings. Two cleaning tanks are used. Pour an appropriate amount of detergent into the first cleaning tank. The water level in the two tanks should be 20 mm to 30 mm higher than the rubber roller to be washed. The two cleaning methods are to use a row of brushes to clean the rubber roller three times horizontally and vertically. The rubber roller that has been cleaned is quickly blown dry to ensure that there is no stain, water stain or scratch on the surface of the rubber roller. Then, the roller is placed in an oven for drying. The oven temperature is controlled at 120° C. and the drying time is 10 minutes.

[0051] S8. After the dried rubber roller is placed in a room temperature environment for a certain period of time, it is placed in a UV machine to optimize the surface of the hose and solidify the hose surface; the UV time is 16 seconds, the UV temperature is 80℃~100℃, and the output speed is 4m / min;

[0052] S9. Spray the wear-resistant coating on the surface of the optimized hose. The amount of wear-resistant coating for a single rubber roller is 25 mg to 40 mg. Then put it into an oven for curing and setting. The oven curing temperature is 120°C and the curing time is 40 minutes.

[0053] S10. Perform platform rolling test on the rubber rollers, and package the rubber rollers that pass the test to complete the forming of the rubber rollers; the qualified standards are: no obvious impurities, no embedded fibers, no stains and various obvious lines on the appearance; qualified size; no flash during platform rolling test, no light transmission in the middle, and consistent light transmission on both sides, which is a qualified product.

[0054] To further optimize the solution, in order to reduce bubbles in the rubber compound and facilitate subsequent extrusion operations, before step S2, the rubber compound after internal mixing is placed in a rubber mixer for cooling and sheeting, and the sheeted rubber compound is cut into strips.

[0055] Example

[0056] Table 1 Material ratio after multiple improvements to the raw material ratio of 76# formula

[0057]

[0058] Table 2 Performance test results

[0059]

[0060] The rubber roller forming process for a printer provided by the present invention improves the heat resistance of the rubber roller by improving the ratio of rubber raw materials; improves the bonding strength between the core shaft and the rubber roller by performing multiple curing forming between the rubber tube and the core shaft, thereby ensuring the structural stability of the rubber roller; and improves the wear resistance of the rubber roller by optimizing the surface of the rubber tube and spraying a wear-resistant coating, thereby extending its service life.

[0061] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A rubber roller forming process for a printer, characterized in that: The following steps are involved: S1, raw material selection, mixing the selected raw materials and then kneading them, and filtering the impurities in the rubber compound after kneading; S2, using an extruder to extrude the mixed rubber material into a hose, and putting the hose into a vulcanizing tank for vulcanization and shaping; S3, cutting the finalized hose and installing the mandrel; S4, putting the rubber hose with the mandrel into an oven for forming to obtain a preliminary rubber roller; S5. According to the length of the rubber hose required by the rubber roller, the two ends of the rubber hose are cut and removed, and the two ends of the mandrel are polished; S6. Use a measuring instrument to perform precision inspection on the size of the polished mandrel; S7, placing the rubber roller that has passed the inspection into a cleaning tank for cleaning, and drying the cleaned rubber roller; S8, putting the dried rubber roller into a UV machine to optimize the surface of the rubber hose; S9, spraying a wear-resistant coating on the surface of the optimized hose, and putting it into an oven for curing and shaping; S10, performing platform rolling inspection on the rubber rollers, and packaging the rubber rollers that pass the inspection, thereby completing the molding of the rubber rollers; In the step S1, the raw materials are selected from a composition, in parts by weight, including: 30-50 parts of nitrile rubber, 25-50 parts of epichlorohydrin rubber, 55-75 parts of butadiene rubber, 5 parts of active zinc oxide, 1-2 parts of stearic acid, 15-30 parts of quick-extrusion carbon black, 5-10 parts of conductive carbon black, 10-15 parts of active calcium carbonate, 3-10 parts of paraffin oil, 5-15 parts of cyclohexane oil, 2 parts of light stabilizer, 1 part of accelerator DM, 1.2 parts of accelerator DT, 0.8 parts of accelerator 29-50 and 1.5 parts of sulfur; In the step S1, the selected raw materials are mixed and then kneaded, wherein the specific kneading process is: Add nitrile rubber, epichlorohydrin rubber and butadiene rubber into the mixing chamber in sequence, the temperature of the mixing chamber is 50℃~70℃, and plasticize for 15 minutes; Add active zinc oxide, stearic acid and active calcium carbonate and mix for 5 minutes; Add conductive carbon black and light stabilizer and mix for 10 minutes; Add quick-pressed carbon black and 50% naphthenic oil and mix for 5 minutes; Add 50% paraffin oil and mix for 5 minutes, and then lower the temperature to 100℃~105℃; Add the remaining naphthenic oil and paraffin oil and mix for 10 minutes; When the temperature of the mixing chamber reaches 130°C, the rubber material is discharged.

2. The rubber roller forming process for a printer according to claim 1, characterized in that: Before the step S2, the rubber material after the banburying is put into a rubber mixer for cooling and sheeting, and the sheeted rubber material is cut into strips.

3. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S2, the extruder is a four-stage extruder, and the extrusion temperatures are 75°, 65°, 55°, and 45° from the die head; the extrusion speed is 5.00-6.00 / rpm; and the outer diameter of the extruded hose is 9.70 mm-10.30 mm.

4. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S2, when the hose is placed in a vulcanization tank for vulcanization and shaping, the pressure in the vulcanization tank is 0.48 MPa to 0.52 MPa, the temperature is 155° C. to 160° C., and the vulcanization time is 60 min to 120 min.

5. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S4, the rubber roller has a rubber hose hardness of 57HRC to 63HRC, a rubber hose volume resistance of 0.20MΩ to 2.00MΩ, and a surface roughness of not less than 0.80μm.

6. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S5, the diameter of the polished mandrel is 8.52 mm to 8.55 mm, and the mandrel arch is 0.15 mm to 0.19 mm.

7. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S8, the UV time is 16 seconds, the UV temperature is 80° C. to 100° C., and the output speed is 4 m / min.

8. The rubber roller forming process for a printer according to claim 1, characterized in that: In the step S9, the amount of wear-resistant coating of a single rubber roller is 25 mg to 40 mg; the oven curing temperature is 120° C., and the curing time is 40 min.

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