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Dongguan printing roller related knowledge
(1) Introduction to printing rubber roller:
Printing roller: rubber roll for printing
Such rubber rolls have moderate hardness and elasticity, high oil resistance, wash solvent resistance, abrasion resistance and shape stability. Soft rolls are generally made of SBR, CR and PU. The surface of the hard stick was originally made of copper and replaced with polyester resin.
(2) Repair analysis of printing rubber roller:
In the work process, the printing rubber roller usually appears, wears, holes, etc. If the new roller is replaced, the cost is too high and the production progress is affected. Rubber repair agent can be used for repair and repair process, taking BD916 rubber repair agent produced by Xiangfan Lianji Adhesive Factory as an example:
1. Surface treatment: Touch the hair to be repaired, clean, decontaminate, degrease, and dry.
2. With rubber repair, pour the rubber repair agent curing agent group B into the iron of the main agent group A and mix it quickly (A: B = 1:1), then pour it into the area to be repaired.
3. Curing: It can be used for 4-6 hours at room temperature and reaches maximum strength in 48 hours.
(3) Storage method:
When the printing rubber roller is stored, it should be supported for storage in the shaft. It is strictly prohibited to stack and stack, and the roller spacing should not be less than 5mm.
(3) Pay attention to matters
1 When carrying and moving, it is necessary to lift and hang the shaft to prevent the rubber surface from smashing, touching and scratching.
2 The new roller is not used temporarily, please do not take off the wrapping paper, the wrapping paper can play a protective role.
3 The printing rubber roller stored in the super-scale period should be inspected before use, and the printing rubber roller should be inspected before use.
(4) Maintenance of printing rubber roller The key to offset printing technology is the control of waterway and ink path balance. The balance of ink and ink relies on the key components of rubber roller and ink roller. Its quality can directly affect product quality. This is especially true for gravure, embossing, and flexo printing. General printing companies maintain equipment once a week, including the maintenance of printing rollers. There are several ways to maintain:
1. After the daily production operation is completed, the rubber roller should be carefully cleaned and washed twice;
2. Cleaning of the printing roller must use the specified chemical, such as industrial alcohol, and must not use corrosive solvents;
3. Remove the rubber roller during holiday break to prevent deformation under pressure;
4. The protection of the surface of the printing roller should be wrapped in newsprint and placed in a dark and ventilated place. [1]
(5) Repair of printing rubber roller for printing rubber roller
1. Surface treatment: Touch the hair to be repaired, clean, decontaminate, degrease, and dry.
2. With rubber repair, pour the rubber repair agent curing agent group B into the iron of the main agent group A and stir it quickly (A: B = 1:1), then pour it into the area to be repaired.
3. Curing: It can be used for 4-6 hours at room temperature and reaches maximum strength in 48 hours.
(6) Faults and causes of common rubber rollers such as printing rubber rollers
1. Heat aging rubber roller will accelerate desulfurization when heated, resulting in heat aging, making the surface sticky, soft, and even cracked into orange. The rubber roller can only be replaced at this time.
2. The colloidal off-chip ink is dried early in the process of transfer on the surface of the colloid, and the dried ink film is degraded due to the ductility of the ink film during the rolling process, which causes the colloidal surface to be destroyed by the crack of the ink film, thereby causing the colloid to fall off. The reason for the early drying of the ink is mainly because the desiccant is added to the ink, and the ink with faster ink drying (for example, POP ink for aluminum foil) is printed, and the ink roller is not cleaned as required, so that the ink is in use during long-term use. A dry knot occurred on the rubber roller.
During the processing of the roller, the temperature is too high, the surface is easy to carbonize, and the printing phenomenon will occur when printing is short.
Excessive printing pressure adjustment, when the machine is idling, if the idling protection measures are improper or not timely, it will accelerate the damage of the surface of the roller.
Solution: The rubber roller that has lost the block can be replaced to solve the resulting printing failure.
3. Surface glazing During the printing process, the organic matter and inorganic matter in the binder in the ink, and the hydrophilic colloid in the fountain solution, the detached filler in the paper, the coating will form a layer of "bright film" on the surface of the ink roller. ", the surface of the ink roller is made vitrified, and the ink transfer performance is lowered.
4. Crystalline compound on the surface of the rubber roller
5. Rubber roller expansion: In addition to the cause of heat, the main reason is the use of improper cleaning agent, so that the colloid is swollen. Solution: Choose the appropriate cleaning agent. (Organic solvent that often causes the rubber roller to swell: MEK methylacetone, trichloroethylene, acetone, cyclomethane, banana water; non-swelling organic solvent: alcohol, kerosene, light oil, roller cleaning agent)
6. Circumferential streaks: In addition to the crystalline compound causing similar circumferential streaks, the dry ink on the hard ink roller will scratch the surface of the soft rubber roller during operation to form a circumferential strip. mark. At this point, the dead ink remover must be used to remove the dried ink.
7. The water bucket roller is stained with ink: the surface of the chrome roller can fully separate the ink after adsorbing the dampening solution, but the excessive dampening solution, the acidity of the dampening solution will increase the emulsification of the ink, and the emulsified ink will follow The return water path returns to the water fountain roller, and the ink on the water fountain roller will cause poor dampening and local water failure. The ink on the bucket roller must be removed in time. At the same time adjust the size of the dampening solution and its composition.
8. Splashing water on both ends of the water roller: During the printing process, water droplets are dropped on the printing surface of the printing plate at both ends of the water roller. The reason for this is as follows: the difference between the length of the water roller and the metering roller exceeds the allowable range, and the length difference It is larger than 0.5mm; the corner of the water bucket roller is well treated, and the roundness of the corner is greater than 0.5mm.
(7) Main features of printing rubber rollers
First, the polyurethane rubber roller colloid has sufficient surface viscosity. Therefore, the rubber roller has good ink transfer property and ink discharge performance in the printing process, and good ink affinity can ensure high quality printing.
Second, it has excellent physical properties. Long-term use will not make the rubber roller hard and aging, and it has good tear resistance, good resilience and excellent wear resistance. Long service life, easy to store, long-term storage does not affect the use of results. In the unbearable pressure of natural rubber rubber roller and synthetic rubber roller, high-speed rotary machine, high-temperature, high-humidity production environment can also operate as usual without impact (polyurethane rubber roller's tensile strength, wear resistance is natural rubber glue The roller is 3 times to 5 times. The compression set is permanent, and the resilience and wear resistance are better than that of the synthetic rubber type rubber roller such as the nitrile rubber roller.
Third, the high-grade rubber roller looks bright and bright from the appearance, the surface of the gel is fine and smooth, and the glue and the core are firmly bonded. The size of the rubber roller does not change greatly at different temperatures, and it can adapt to high temperature and high humidity environment or cold and dry weather conditions.
Fourth, the printing rubber roller has good affinity for water: due to the special formulation added to the polyurethane material, the internal structure of the molecule is changed, and the factor of good affinity to water is introduced and increased, and the resistance of the material to water is improved. Surface tension and surface water absorption, so it is used as a dampening water, alcohol series rubber roller, and the effect is excellent.
5. Printing rubber roller has excellent chemical properties and is suitable for various types of inks and printing methods. It is very suitable for varnish rubber roller and UV ink roller. (especially good solvent resistance to diesel, gasoline, dampening oil, kerosene, salt water, etc.)
Sixth, high-grade rubber roller is easy to clean. It is very easy to convert dark and dark inks in production. As a plate roller for some printing presses, it can stick to the characteristics of paper wool, dust and anti-sticking powder on the printing plate, and does not require frequent loading and unloading cleaning. Easy to produce.
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