The rubber roller is a rubber product made by vulcanizing the coated rubber layer on the iron core. The main materials are natural rubber, nitrile rubber, silicone rubber, polyurethane and so on. Nitrile rubber is generally used for the surface rubber layer of the rubber rollers commonly used for offset printing, and polyurethane rubber is used for middle and high grades.
Printing rubber rollers, blankets, fountain solution and ink cleaner (car wash water) are all auxiliary printing equipment. Although they are used in small amounts in printing, they have a great influence on the quality and stability of the printed matter.
The rubber roller is also one of the main components of the inking system of the offset printing press. It must be in continuous contact with water, ink, paper, etc., so it should absorb moisture to a minimum. Compared with metal rollers, rubber rollers have the characteristics of elasticity, acid and alkali resistance, and no rust. They have good ink absorption and ink transfer properties, and are easy to clean, so they are widely used.
Proper selection, use, cleaning and maintenance of rubber rollers are very important for printing quality. In particular, to ensure the full play of high-end printing machines, rubber rollers and cleaning agents matching their requirements must be selected.
However, at present, domestic printing rubber roller manufacturers are mostly small enterprises, most of which are low-end products. They are used for ordinary offset printing machine manufacturers, or renovating old rubber rollers for small and medium-sized printing factories. long. Most of the rubber rollers on high-end offset printing machines are still imported, or directly imported, or made with imported mixed rubber roller materials.
Rubber roller cleaning agent also faces the same problem. With the high-speed multi-colorization of offset printing and the rising voice of "green", alcohol wetting will also be controlled, and the demand for high-quality printing rubber rollers and cleaning agents at reasonable prices will also increase.
Match dilemma
Among the printing auxiliary equipment, high-quality rubber rollers and their cleaning solvents (car washing water) are faced with how to improve quality and reduce costs, so that printing companies can afford "BMW", but also "Golden Saddle" and "Feed" The problem of "fine materials".
With the development of offset printing equipment in the direction of high-speed multi-colorization, the rubber roller has changed from the self-provided processing parts of the printing factory to the market procurement. However, the rubber rollers of high-end equipment rely more on imports, so the problems of "buying horses" and "matching saddles" have also become a problem for printing companies, especially small and medium-sized printing companies.
In the era of lead printing, printing companies with a certain scale all set up their own "glue houses" to renovate printing rollers. This kind of rubber roller has low cost and serious pollution. It is easy to soften at high temperature and hard at low temperature, and it can not adapt to high temperature and high humidity environment, especially the printing gold and printing mesh screen version is not suitable. With the replacement of printing equipment and the improvement of environmental protection requirements, it has gradually Eliminate.
In the 1980s, printing rubber rollers showed great technological innovations. The new rubber rollers were not restricted by climatic conditions and had good strength and corrosion resistance, but the cost was high. After that, problems such as large and small ink and wash, large dot increase, heavy front-to-back and even ink sticks occurred on the ground, which required frequent shutdown and debugging. This virtually wastes time and increases costs, and print quality is difficult to maintain stability. After a while, it was no longer possible, and had to replace the new rubber roller. Fall into another "reincarnation" again.
Finally, the overall accounting, waste products plus the time and cost of downtime delays, as well as the quality and delivery time, and the various adverse factors that bring to the company's reputation, it is better to use the original rubber roller cost-effective.
Faced with the dilemma of rubber roller selection in printing companies, domestic rubber roller manufacturers should increase R & D investment, research and development by themselves, or introduce advanced technology, or actively seek joint ventures with well-known foreign manufacturers, both to solve domestic prices suitable for high-quality rubber rollers The dilemma of inadequate supply can also take this opportunity to enhance the market competitiveness of enterprises, preemptively occupy the market, curb the "unification of the world" of imported rubber rollers, and avoid the embarrassment of domestic rubber rollers being forced out. [next]
Carefully
In printing companies, everyone usually gives enough care to printing blankets. The printing rubber roller is the same rubber product as the printing blanket. It also needs to maintain stable mechanical properties, chemical properties and printability to prolong the service life and ensure the quality of printing. Therefore, its storage, use and maintenance should be given the same attention and care as the blanket. But not in all printing companies, rubber rollers can be treated equally with printing blankets.
In fact, the care required by the rubber roller is not so difficult to do:
During transportation and handling, avoid collision with sharp and hard objects, do not press heavily, and do not cause strong friction between foreign objects and rubber rollers.
When entering the warehouse, each rubber roller should be tested, such as whether there are pits on the surface, whether there is deviation or deformation of the roundness and diameter.
The storage period of the rubber roller should not be too long, preferably not more than 6 months. The date should be marked on the outer packaging of the rubber rollers in stock, in order to implement quality tracking and "new storage" when out of the warehouse.
Make reasonable inventory. It can neither be out of stock or under-stocked, nor over-stocked. It is necessary to maintain a certain stock of rubber rollers. Because the newly cast rubber roller should not be put into use immediately. At this time, the internal structure of the rubber roller is not stable enough. If it is put into use immediately, it is easy to reduce the service life. The new rubber roller should be placed for a period of time to adapt it to the outside temperature and humidity, and maintain a relatively stable state, which can increase the toughness of the colloid, thereby improving durability. Too much inventory, too long, is not only a waste of funds, but also will cause natural aging, wrinkling, and corrosion of the shaft head due to long storage, resulting in unnecessary storage damage. According to the actual production situation and the type of rubber roller (for example, the replacement of the rubber roller is more and frequent, and the ink roller and the ink roller are replaced relatively less), the stock of various rubber rollers should be reasonably formulated.
The storage environment of the rubber roller is the same as that of the blanket. Choose a cool, dry and ventilated place. The temperature should be maintained at 20-25 ° C and the relative humidity should be maintained at 60% -70%. Avoid direct sunlight, preferably in a backlit or dark warehouse indoor. Keep away from high temperature, heat and radioactive sources, and avoid storing with acids, alkalis, oils and sharp hard materials. In addition, the rubber roller should be placed vertically or horizontally. It is best to use a special frame to place it horizontally. The rubber head should be placed on the frame to support the shoulders on both sides and keep the rubber roller parallel to the ground. Press, or contact with other objects to prevent the adhesive surface from being deformed and sticking, and at the same time, do not remove the packaging paper before use.
Rubber rollers should not be stored near large motors and generators. Because of the large amount of ozone generated by these devices, the surface of the rubber roller will be aged and cracked.
Before long-term storage, the rubber roller should be ground or rubbed with talc to test the surface of the rubber roller.
The old rubber rollers that are left unused should be cleaned, wrapped with plastic film and placed on the rubber roller frame. Do not stack a few of them randomly or lean them against the wall, so as not to expose the rubber to undesirable Loss of business.
The waste rubber rollers should not be thrown, placed, pressed or pressed in a heavy way during the transportation process to the casting process, so as to keep the roller core from deviating or bending and ensure the normal use of the roller core.
Since the 1990s, printing companies have introduced printing machinery and printing equipment from developed countries, and the rubber rollers are naturally also supplied with original rubber rollers. However, after several years of use, when the aging rubber roller needs to be replaced, in the face of the disparity between the domestic and imported prices, many printing companies have more to consider the cost factor and replaced the low-cost domestic rubber roller.
Because the printing suitability of the domestic rubber roller is very different from that of the original rubber roller, after replacing the domestic rubber roller, many printing parameters must be retested and adjusted. Usually the quality is justified at first, but the problem comes within a few months.
First, the ability to transfer water and ink is reduced, which leads to a decline in printing quality; machine personnel continue to increase the amount of water and ink, and the balance of water and ink is difficult to grasp. The probability of waste products in printing increases, and the difficulty of machine operators increases. It is necessary to increase the number of sampling inspections. Frequency and constantly adjust the amount of ink on the water; printing speed can not go up, can not play the advantages of high-speed printers.
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