The type and performance of domestic small offset presses

Small offset printing is generally referred to as "light printing." Refers to the machine light weight, simple structure, light pressure, printed products can only do office supplies. In actual fact, with the continuous development and improvement of the Big 8 and the Six-Power, the new technologies such as ink separation, bilateral pull gauges, bridge feeding, and variable frequency speed control are adopted. These machines print short magazines, samples, albums, and color prints. Publicity products, stickers, and other products can still be competent. Therefore, they are increasingly favored by small and medium-sized printing factories.
At present, China's small and medium-sized printing presses use small offset presses. Both domestic and imported, imported machines are 1-2 times more expensive than domestic ones, limited to funds, small and medium-sized printing companies have a large demand for domestic small offset presses, and some varieties are even in short supply. It is the manufacture of small offset presses. The golden age of the manufacturers.
There are more than 20 small offset press manufacturers in China, distributed in various provinces, such as Beiren, Guankou, and Weihai Haitian. Shandong, the largest manufacturer of small offset presses, except Weihai Bintian, Weihai Printing Machinery, Weifang Huaguang, Weifang Eastern Airlines, Weifang Sanjia, and Yantai Wuzhou. From the point of view of small offset presses manufactured by various factories, it can be roughly classified into the following types.
1. Desktop eight small offset press. For example, the Yingkou J81, Chongqing Sanko J818 and other machines weigh approximately 70kg and use the friction roller to feed paper. Most machines use a zinc oxide paper base plate. Most of the products are materials, supplementary materials, and exam papers. This kind of machine is small in size, light in weight, belongs to light printing equipment, the price is about 16,000 yuan.
2. Ink mixed small offset press. For example, the Yingkou 1800AWD, Weihai Printing Machine Y1A3 and other machines, floor-type without bridge, water roller, ink roller mixed together, straight paper, using nozzle feeding method, no rules, weighing about 600kg, the most suitable oxidation Zinc printing short-lived text, usually printed paper weight 60 ~ 100g/m2, 40g/m2 below the paper is difficult to print, so this type of machine can also be called light printing equipment, priced at 60,000 yuan about.
3. Side push type small offset press. For example, Weifang Huaguang D81A, Wenzhou Weiyan YP1A3 and other machines. In this type of machine, the water roller and the ink roller are separated, but there is one plate roller and two plate rollers. The nozzle is used to feed the paper, and the paper is fed straight into the paper. The paper is fed through the bridge, and the paper is transported to the paper through the feeding belt. The former regulations, and then push the prescribed position, the relative accuracy of overprinting is relatively poor, and the uniformity of the ink on the surface of the two inking rollers is poor. It is difficult to print color prints, especially color solid prints. Therefore, Such machines should also be classified as light printing equipment, priced at around 60,000 yuan.
4. After the suction nozzle type horizontal feeding side pull gauge small offset press. For example, the Nanning ball J801-I, Beijing multiple PZ1440 and other machines. This type of machine uses a large offset press-type rear nozzle to feed paper, cross-feed, no bridge, the paper is sent to the front gauge by the transfer wheel, and then the paper is positioned on the front gauge by the friction force of the ball on the cylinder. On the side, then pull the paper to pull the position, the front gauge of this type of machine can be adjusted, very conducive to multi-color overprint. Its ink-and-ink separation, three plated ink rollers and one plated water roller, printing ink color uniformity is better. Helical gear frequency control, especially helical gear transmission, has a larger meshing coefficient and is unique in small offset presses. Suitable for printing paper weight 28g/m2 ~ 200g/m2 prints. The weight of the machine is more than 600kg. Obviously, this type of machine is suitable for commercial printing, and it is difficult to draw light on the scope of printing. Therefore, it is called a small offset printing machine and the price is about 60,000 yuan.
5. Cross-bridge type lateral feeding side offset small offset press. For example, Weifang Huaguang WF47A, Changzhou PuDete D61A, Weihaitian WH17 and other six small offset presses. The common feature of this kind of machine is "two inks and one water", that is, two sets of inking roller and one plate of water roller. Cross-feeding paper, double-sided pull gauges, paper from the front suction nozzle after the suction paper sent to the bridge over the paper conveyor belt, and then passed into the front gauge and side pull the specified position after printing. The front gauge of this type of machine cannot be adjusted. If the image is registered, it can only be solved by pulling the plate position. This type of machine is equipped with advanced clamping devices and the loading is fast and reliable. The printing speed is about 7,000 sheets per hour, and the weight of printed paper is from 28g/m2-250g/m2, and the application range is relatively large. However, since there are only two inking rollers, the amount of ink on the layout is poor and the uniformity is poor. Therefore, the effect of color printing on the printed version, especially on the full-size version, is unsatisfactory. However, because it has more advantages, it can satisfy general products. The business requirements, so this type of machine is a factory-type small offset press, the price varies from factory to factory, about between 65,000 to 90,000 yuan.
6. Factory type single, two-color small offset press. This type of machine is powered by six machines. The common feature is cross-feeding, cross-bridge, side pull gauges, "Sanmojishui", and powder spraying devices. The maximum speed is over 7,000. This type of machine is overprinted accurately without ink bars. The on-the-spot version is sturdy and strong. The printed product is the same quality as a large-sized offset press. It can meet the quality requirements of medium-to-high products and has a promising future. Several models with special features will now be introduced.
1) In addition to the advantages mentioned above, the SJ47A Liukai small offset press of Shandong Weifang Sanjia Co., Ltd. has a maximum weight of 350g/m2 which can meet the printing requirements for small-lot clothing labels. Less than 80,000 yuan.
2) Beijing Beiren Brand YP-1B3A six-opening small offset printing press adopts PLC control and continuous feeding after the suction level. This way the paper feeding is stable and accurate. Therefore, its maximum speed can reach 10,000 per hour. Equipped with static eliminator and fixed-point automatic refueling mechanism to ensure the normal operation of the machine and smooth printing. Commercial printing is more practical.
3) Wei Hai Bin Tian WH47-NP six open small offset press, two-color printing, horizontal straight code, rolling line cutting and other functions completed at one time, and the two-color roller can be fine-tuned around the world, convenient operation, especially suitable for printing VAT invoices Thin paper voucher products are the most advanced machines in China's small offset presses.
At present, some manufacturers have lengthened the rollers of small offset presses and created a small offset press type four-way boot. I think that the scope of small offset presses can only be up to six hours before starting. Of course, manufacturers can continue to develop new products for market demand, which is a good thing for China's printing industry.
Here, we hope that the manufacturers of small offset presses can further improve the quality of materials and processing accuracy, and strictly perform assembly and commissioning work, improve the rate of one-time unpacking, and strive to seize the international market.