Several problems that should be paid attention to in improving the comprehensive benefits of rubber rollers

    The rubber roller is a rubber product made by vulcanizing the coated rubber layer on the iron core. The main materials include natural rubber, nitrile rubber, silicon rubber, and polyurethane. Offset commonly used rubber roller surface layer is generally selected nitrile rubber, high-grade selection of polyurethane rubber.
    Printing rollers and blankets, fountain solutions, and ink cleaners (car wash water), etc., belong to the printing aids. Their use in printing is small, but it has a great influence on the quality and stability of prints.
    The rubber roller is also one of the main components of the offset printing ink system. It should be in continuous contact with water, ink, paper, etc. Therefore, moisture should be absorbed to a minimum. Compared with the metal roller, the rubber roller has the characteristics of elasticity, acid and alkali resistance, no rust, etc., has good ink absorption and ink transmission, and is easy to clean, so it is widely used.
    The correct selection and use, cleaning and maintenance of the rubber roller are critical to the printing quality. In particular, to ensure the full play of the role of high-end printing presses, it is necessary to use the rubber roller and its cleaning agent that match its requirements.
    However, at present, most of the domestic manufacturers of printing rubber rollers are small-scale enterprises, most of which are low-grade products, which are used for ordinary offset printing press manufacturers, or they can replace the old rubber rollers for small and medium-sized printing factories. They can only be used on medium and low-speed printing machines, and their service lives are also not long. The majority of rubber rollers on high-grade offset presses still rely on imports, either directly or on imported rubber rollers.
    Roller cleaners also face the same problem. With the high-speed multicoloring of offset printing and the soaring of “green” voices, alcohol wetting will also be controlled. The demand of printing presses for moderately-priced high-quality printing rollers and cleaning agents will also increase.
    Match the dilemma
    In printing aids, high-quality rubber rollers and cleaning solvents (car wash water) are faced with how to improve quality and reduce costs, so that printing companies can afford "BMW" and they can afford "Golden Saddle" and "Hello". The problem of "fine material".
    With the development of offset printing equipment towards high-speed multi-colorization, the cots have changed from self-provided parts of the printing industry in the printing era to market procurement. However, the rubber rollers of high-end equipment are heavily dependent on imports. Therefore, the problems of “buying horses” and “saddlebacks” have also become a problem for printing companies, especially small and medium-sized printing companies.
    In the printing era, printing companies with a certain scale have set up "plastic rooms" to revamp their printing rollers. This roller has a low cost and serious pollution. Soft and soft at high temperatures, hard and hard at low temperatures, can not adapt to high temperature, high humidity environment, especially the printing presses, printing screen adjustment is even more unsuitable, with the upgrading of printing equipment and environmental protection requirements have been gradually Eliminated.
In the 1980s, great technical innovations appeared in the printing roller. The new roller was not constrained by climatic conditions and had strong strength and corrosion resistance, but the cost was high.
Since the 1990s, printing companies have introduced printing machinery and printing equipment from developed countries, and the rubber rollers are naturally supplied with original rubber rollers. However, after a few years of use, when the aging of the rubber roller needs to be replaced, in the face of a disparity between domestic and imported products that differ by a factor of several times, many printing companies consider more cost factors and replace them with inexpensive domestic rubber rollers.
    Because the printability of the domestic rubber roller and the original rubber roller is very different, after replacing the domestic roller, many printing parameters must be re-tested and adjusted. Usually the quality is still right at the beginning, but the problem does not come in a few months.
    First, the ability to transfer water and transfer ink reduced the quality of printing. Machine personnel continuously increased the amount of ink and water. The balance between water and ink was difficult to grasp. The chance of waste products in printing increased, and the difficulty of machine operator's work increased. It was necessary to increase the sampling inspection. Frequency and constantly adjust the amount of ink on the water; printing speed is also not up, can not play the advantages of high-speed printing presses.
After that, there were problems such as the sudden and large ink drop, serious increase in outlets, light weight in front of the site, and even ink sticks, which required regular shutdowns. This is an invisible waste of time, increased costs, and the printing quality is difficult to maintain stability. After a period of time, it was too late to replace the new rubber roller. Once again caught in another "reincarnation."
    Finally, the overall account, waste plus time and cost of stoppage delays, and thus affect the quality and delivery time, to the company's reputation for the various unfavorable factors, it is better to use the original rubber roller cost-effective.
    In the face of this dilemma in the selection of rubber rollers for printing enterprises, domestic rubber roller manufacturers should increase R&D investment, develop their own products, or introduce advanced technology, or actively seek joint ventures with well-known foreign manufacturers to solve the problem that domestic prices are suitable for high-quality rubber rollers. The precarious situation of insufficient supply can also rely on this opportunity to enhance the market competitiveness of enterprises and preemptively occupy the market, curb the import of rubber rollers to "unify the world" and avoid the situation in which domestic rollers are forced out.
    Careful care
    In printing companies, we usually give adequate care to printing blankets. Printing rubber rollers and rubber blankets are the same as rubber products. They also need to maintain stable mechanical properties, chemical properties and printability to prolong their service life and ensure the quality of printed products. Therefore, its storage, use and maintenance should also be given the same attention as the blanket, the same care. But not at all printing companies, the rubber roller can be treated equally with printed blankets.
    In fact, the need for care of the rubber roller is not that difficult to do:
    During transport and handling, collision with sharp hard objects should be avoided, and heavy pressure should not be applied. Strong friction between foreign objects and the rubber roller must not be caused.
    When the storage, each roller should be tested, such as the presence of pits on the surface, whether the roundness and diameter deviation, deformation and so on.
    The storage period of the rubber roller should not be too long, preferably not more than 6 months. Dates should be marked on the outer roll of the stock roll in order to carry out quality tracking and delivery.
    Make a reasonable inventory. Neither inventory nor inventory is too small nor too much inventory. It is very necessary to keep a certain stock of rubber rollers. Because the new cast rubber roller should not be put into use immediately. At this time, the internal structure of the rubber roller is not stable enough, and 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 allow it to adapt to the outside temperature and humidity, and maintain a relatively stable state, which can increase the toughness of the colloid, thereby enhancing durability. Too much inventory and too long will not only be a waste of funds, but will also lead to natural aging, creasing, and corrosion of the shaft head due to long storage time, resulting in unnecessary library damage. Should be based on the actual production situation and the type of roller (such as the number of plastic roller replacement and frequent, and uniform ink roller, transfer roller is relatively small replacement), a reasonable inventory of various rubber rollers.
    The storage environment of the rubber roller should be the same as that of the blanket. Choose a cool, dry and ventilated place. Keep the temperature at 20~25°C, and keep the relative humidity at 60%~70%. Avoid direct sunlight. It is better to use the backlight or dark warehouse. indoor. Keep away from heat, heat, and radioactive sources and avoid storing with acids, alkalis, oils, and hard materials. In addition, the rubber roller should be erected vertically or horizontally. It is best to use a special rack horizontally. The rubber head should be placed on the frame body to support the shoulders on both sides and keep the rubber roller parallel to the ground. It is forbidden that the glue surfaces are stacked and squeezed. Pressure, or contact with other items, to prevent deformation and adhesion of plastic surface pressure, at the same time, do not remove the wrapper before use.
    Cots should not be stored near large motors and generators. Because the large amount of ozone generated by these devices will cause the surface of the roller to crack and crack.
    Long-term preservation of the rubber roller should be used before grinding or talcum powder to wipe the surface of the roller.
    After the unused old rollers are cleaned, they are wrapped with plastic film and placed on the roller frame. Do not stack them together or place them upside down on the wall to prevent the colloid from being trapped. Loss of business.
    In the process of transporting waste rubber rollers to processing and casting, avoid throwing, dislodging, disorderly pressing or heavy pressure to keep the roller core from deviating or bending and ensure that the roller core can be used normally.