The rubber roller is an important printing material. It is made of rubber as the main raw material. The quality of the rubber roller and the proper use of it are one of the important factors that affect the quality of offset printing. Therefore, we must pay great attention to it.
First, the rubber used in the rubber roller Natural rubber and synthetic rubber two categories. In addition to the high elasticity of natural rubber, there is a certain degree of strength and good wear resistance, insulation, impervious water permeability. However, the effect of temperature on it is very significant. When the temperature is slightly high, it will be soft and sticky. When the temperature is lower, it will be hard and brittle. In addition, due to the effects of oxygen and light, the time will be longer and it will lose its elasticity and aging. When it comes to gasoline, benzene and other organic solvents, it swells. Therefore, natural rubber cannot be used for the surface layer of the rubber roller.
Synthetic rubber is a synthetic polymer elastic material, and there are many types of synthetic rubber. The rubber used for the rubber roll is mainly acrylonitrile-butadiene rubber, polychloroprene polysulfide, and polyurethane rubber.
Second, the metal core rubber roller Offset roller is a round roller composed of metal core and rubber. The metal core of the rubber roller is the skeleton of the rubber roller, so the material is required to have good rigidity and no deformation. Its diameter is generally 42-45 mm, and the metal core must have the following technical conditions:
1. The metal core material must be made of round steel or no steel pipe.
2. The surface of the metal core shall have a "human" shape and a straight thread. The central part of the metal core shall be divided into two ends with a pitch of about 10-15mm.
3. There must be a thimble hole at both ends of the metal core, and the thimble hole must be in the middle. Absolutely no eccentricity is allowed, in case the turning diameter is different.
4. The metal core must be balanced during processing and must not be allowed to oscillate or bend.
5. The surface of the metal core must not be affected by mechanical damage, porosity, cracks, and welding.
6. Before processing the rubber roll, the metal core must be inspected and treated to remove oil and rust.
Third, the structure of the rubber roller
The rubber roller consists of a metal core and a rubber layer. The rubber layer is divided into a surface layer, a bridge layer, and a hard glue layer. The surface adhesive layer is the main part of the rubber roller, and it plays a role of uniform ink transmission. The thickness of the adhesive layer is generally 6-8mm; the hardness is low, and it is generally about 30° Shore. The bridge glue layer plays a role in bonding the surface layer of the glue, the thickness is 8-10mm, and the hardness is generally around 50° Shore. The hard glue layer plays a role in bonding the metal core and the bridge glue layer, and its thickness is 2-3mm, and the hardness is above 98° Shore.
Fourth, the technical requirements of rubber roller 1. Hardness and elasticity. The rubber roller must have good elasticity and minimal compression deformation, and the surface layer should be soft, but too soft or too hard can affect the ink transfer effect.
2. Ink transferability. It is required to have a large amount of ink sucked by the rubber roller and a low ink transfer rate, so that more ink can be stored on the rubber roller, which helps to transport the ink evenly, and can transfer a sufficient amount of ink evenly in a short period of time. Printing plate up.
3. Adaptability. It is required that under various temperature conditions, the properties of the rubber roller should be good to ink transfer; under high temperature conditions, it is required that the roller should not be hardened and maintain good ink-transferability; under high temperature conditions, the roller should be required to be non-tacky. Bake the glue, in the process of operation requires that the roller heat is small, in order to maintain a constant ink viscosity.
4. Oil resistance. The rubber roller is more resistant to oil, and rubber rollers with poor oil resistance tend to expand or shrink, causing dimensional changes that affect the quality of the print.
5. In addition to the above requirements, the rubber roller must also have a certain strength and wear resistance. The surface of the rubber roller should be free from impurities, pinholes, and easy to clean. The overall diameter of the roller must be the same.
Fifth, the use and storage of rubber roller When cleaning the rubber roller daily, it must be cleaned carefully. When cleaning the rubber roller, it cannot be greedy and convenient. Do not rely on the scraper to clean it completely. Always lift the roller to perform manual cleaning, especially the glue. Both ends of the roller must be cleaned, because the drying oil and the diffusion agent in the resin ink penetrate the surface of the roller for a long time, and the surface of the rough capillary hole is closed to form an oxidized conjunctiva, which causes the roller to lose fat and affect the ink absorption and ink transfer effect. . If a smooth hard rubber roll appears on the surface of the rubber roll, the conjunctiva can be removed by hand or by mechanical sanding, but the diameter of the rubber roll cannot be changed too much, otherwise the ink transfer performance will be affected. It can also be washed with about 20% aqueous sodium hydroxide solution, then neutralized with weak acid, and finally rinsed with fresh water. However, organic solutions such as ketone esters cannot be used to clean the conjunctiva layer.
The aging of the rubber roller coupled with the erosion of chemicals can easily cause the rotten rubber to lose the “slagâ€, which will cause troubles to the printing and seriously affect the quality of the product. The exclusion method is generally to polish the soft and cracked adhesive layer. Or grinding processing.
The storage life of the rubber roller can not be too long, because the aging of the rubber is always present. The longer the storage period, the more serious the aging. In addition, the rubber roller should be stored in a place without direct sunlight, dry, clean and cool, and avoid excessive humidity or overheating. The rollers should be straight at the journal end and the surfaces should not touch each other. Don't take apart the original nephew and open it when you use it.
First, the rubber used in the rubber roller Natural rubber and synthetic rubber two categories. In addition to the high elasticity of natural rubber, there is a certain degree of strength and good wear resistance, insulation, impervious water permeability. However, the effect of temperature on it is very significant. When the temperature is slightly high, it will be soft and sticky. When the temperature is lower, it will be hard and brittle. In addition, due to the effects of oxygen and light, the time will be longer and it will lose its elasticity and aging. When it comes to gasoline, benzene and other organic solvents, it swells. Therefore, natural rubber cannot be used for the surface layer of the rubber roller.
Synthetic rubber is a synthetic polymer elastic material, and there are many types of synthetic rubber. The rubber used for the rubber roll is mainly acrylonitrile-butadiene rubber, polychloroprene polysulfide, and polyurethane rubber.
Second, the metal core rubber roller Offset roller is a round roller composed of metal core and rubber. The metal core of the rubber roller is the skeleton of the rubber roller, so the material is required to have good rigidity and no deformation. Its diameter is generally 42-45 mm, and the metal core must have the following technical conditions:
1. The metal core material must be made of round steel or no steel pipe.
2. The surface of the metal core shall have a "human" shape and a straight thread. The central part of the metal core shall be divided into two ends with a pitch of about 10-15mm.
3. There must be a thimble hole at both ends of the metal core, and the thimble hole must be in the middle. Absolutely no eccentricity is allowed, in case the turning diameter is different.
4. The metal core must be balanced during processing and must not be allowed to oscillate or bend.
5. The surface of the metal core must not be affected by mechanical damage, porosity, cracks, and welding.
6. Before processing the rubber roll, the metal core must be inspected and treated to remove oil and rust.
Third, the structure of the rubber roller
The rubber roller consists of a metal core and a rubber layer. The rubber layer is divided into a surface layer, a bridge layer, and a hard glue layer. The surface adhesive layer is the main part of the rubber roller, and it plays a role of uniform ink transmission. The thickness of the adhesive layer is generally 6-8mm; the hardness is low, and it is generally about 30° Shore. The bridge glue layer plays a role in bonding the surface layer of the glue, the thickness is 8-10mm, and the hardness is generally around 50° Shore. The hard glue layer plays a role in bonding the metal core and the bridge glue layer, and its thickness is 2-3mm, and the hardness is above 98° Shore.
Fourth, the technical requirements of rubber roller 1. Hardness and elasticity. The rubber roller must have good elasticity and minimal compression deformation, and the surface layer should be soft, but too soft or too hard can affect the ink transfer effect.
2. Ink transferability. It is required to have a large amount of ink sucked by the rubber roller and a low ink transfer rate, so that more ink can be stored on the rubber roller, which helps to transport the ink evenly, and can transfer a sufficient amount of ink evenly in a short period of time. Printing plate up.
3. Adaptability. It is required that under various temperature conditions, the properties of the rubber roller should be good to ink transfer; under high temperature conditions, it is required that the roller should not be hardened and maintain good ink-transferability; under high temperature conditions, the roller should be required to be non-tacky. Bake the glue, in the process of operation requires that the roller heat is small, in order to maintain a constant ink viscosity.
4. Oil resistance. The rubber roller is more resistant to oil, and rubber rollers with poor oil resistance tend to expand or shrink, causing dimensional changes that affect the quality of the print.
5. In addition to the above requirements, the rubber roller must also have a certain strength and wear resistance. The surface of the rubber roller should be free from impurities, pinholes, and easy to clean. The overall diameter of the roller must be the same.
Fifth, the use and storage of rubber roller When cleaning the rubber roller daily, it must be cleaned carefully. When cleaning the rubber roller, it cannot be greedy and convenient. Do not rely on the scraper to clean it completely. Always lift the roller to perform manual cleaning, especially the glue. Both ends of the roller must be cleaned, because the drying oil and the diffusion agent in the resin ink penetrate the surface of the roller for a long time, and the surface of the rough capillary hole is closed to form an oxidized conjunctiva, which causes the roller to lose fat and affect the ink absorption and ink transfer effect. . If a smooth hard rubber roll appears on the surface of the rubber roll, the conjunctiva can be removed by hand or by mechanical sanding, but the diameter of the rubber roll cannot be changed too much, otherwise the ink transfer performance will be affected. It can also be washed with about 20% aqueous sodium hydroxide solution, then neutralized with weak acid, and finally rinsed with fresh water. However, organic solutions such as ketone esters cannot be used to clean the conjunctiva layer.
The aging of the rubber roller coupled with the erosion of chemicals can easily cause the rotten rubber to lose the “slagâ€, which will cause troubles to the printing and seriously affect the quality of the product. The exclusion method is generally to polish the soft and cracked adhesive layer. Or grinding processing.
The storage life of the rubber roller can not be too long, because the aging of the rubber is always present. The longer the storage period, the more serious the aging. In addition, the rubber roller should be stored in a place without direct sunlight, dry, clean and cool, and avoid excessive humidity or overheating. The rollers should be straight at the journal end and the surfaces should not touch each other. Don't take apart the original nephew and open it when you use it.
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