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The ink roller on the printing machine is mainly used to transfer ink. In order to distribute the ink quickly and evenly between the ink rollers, the printing machine is usually arranged in an alternate manner of soft ink rollers and hard ink rollers, so that the adjacent ink rollers have good contact.
Soft ink rollers (commonly known as rubber rollers) are generally made of vulcanized natural rubber, synthetic rubber, gelatin and polyurethane and other polymers; hard ink rollers (commonly known as metal rollers) are generally made of iron , Copper and other metal materials. Both the rubber roller and the metal roller have good lipophilicity, so as to ensure that the ink is well moistened and adhered on the surface, which is the premise of ensuring the transfer of ink between the ink rollers.
Rubber roller manufacturing process
ï¼Main raw materials: high molecular polymers, vulcanizing agents, plasticizers, fillers, accelerators ï¼Main technological process and function: mixing-filtering-curing treatment-grinding-polishing
1. Mixing: Control the content of each component, the heat baking temperature, etc., to stabilize the hardness and components.
2. Filtration: Make the colloid even and free of impurities. This is particularly important for high-speed printing presses: uniform force is applied during high-speed operation, and the energy transfer is uniform. When various factors cause expansion or contraction, they can still maintain uniformity, so that only adjustment can reduce or avoid adverse effects.
3. Curing: Stabilize the speed-giving agent through heating, pressure and vulcanization, so that the rubber shrinks to a minimum degree when subjected to external force. Turn the soft and ductile compounds into a solid material with a certain degree of softness, which is more suitable for the transfer and transfer of ink.
4. Grinding and polishing: The key to determine the dimensional accuracy and surface area of ​​the rubber roller, especially the arc treatment of the alcohol water roller. The rubber surface looks smooth, but under high magnification, there are many small protrusions and depressions. These convex and concave portions increase the surface area of ​​the rubber roller, making it have superior ink transfer and transfer performance.
This process requires a constant temperature: the temperature is too high, the surface is easy to carbonize, and the peeling phenomenon will occur in short-term printing. If the temperature is too low, it will be brittle easily, which will cause the ink transfer performance to decrease.
Rubber roller performance requirements
ï¼Inclusion ï¼Affinity to water and ink ï¼Elasticity – Whether the pressure can be expressed correctly; the pressure performance with good elasticity is obvious ï¼Indentation reflection ï¼The basis for correct adjustment of the printing pressure ï¼Vibration absorption ï¼Prevent up and down jump, resonance (high speed Time)
ï¼Abrasion resistance ï¼The ability to maintain high surface area and prevent glaze formation, and to maintain the inclusiveness ï¼Energy transmission performance ï¼Ensure that it does not accumulate energy or reflect energy ï¼Corrosion resistance ï¼Good chemical resistance performance helps Extend life-Conductivity-Antistatic, non-adsorption of ink and paper wool-Heat transfer-Extend its life and reduce the time for adjusting pressure-High temperature resistance-Extend the life of the rubber roller itself (especially for high-speed machines)
Rubber roller hardness
Rubber roller hardness is an important performance of rubber roller performance, the specific performance is as follows:
-Soft and soft-good tolerance, high elasticity, strong pressure resistance, good vibration absorption, good indentation reflection, large adjustment range of pressure-a certain hardness-not easy to corrode and wear, strong high temperature resistance, rapid pressure performance, so The hardness of the rubber roller needs to be moderate: too soft, poor anti-corrosion ability, easy to accumulate energy; too hard, the ink transfer ability is reduced, the vibration absorption is poor, and it is easy to gradually destroy the precision design of the printing machine. Therefore, it is necessary to select the correct glue type and hardness according to the appropriate printing pressure and other printing suitability.
Attachment: Indentation performance of rubber roller (indentation width-rubber roller pressure)
-Increasing the indentation width by 50% requires an increase of 250% of the pressure of the rubber roller.-Increasing the indentation width by 100% requires an increase of the pressure of the rubber roller by 750%.
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