The choice of collator: friction and suction

Friction and suction are two forms of paper on the collation machine. The purchase must be combined with the actual situation and the content of the work to be completed. It is generally necessary to comprehensively consider the production speed, output, factory buildings, workstations and other accessories, specific production conditions and so on. If a single-color or two-color print is printed, and accidental ink contamination does not have a great influence on the quality of the product, the friction-type collator is the best choice; if it is printed in multicolor, the color is thick and the coating is applied. When fabric materials are used, it is best to choose a suction-type collating machine. Friction Collator The Friction Collator uses a friction roller to transfer the paper in the paper cassette to the feed conveyor. The separation paper is separated by a separate baffle or page angle separator, which ensures the transmission of single sheets. Like our usual copier feed. The operator can adjust the system's operating speed, overlap detection and feed wheel pressure and more. There are many kinds of friction type collator, everything from desktop equipment to 60-story working tower type machines. Desktop devices are generally suitable for small office or quick printers, and high-speed, large tower devices are generally used for large-scale commercial printing. The advantage of using a friction collator is that it is cheap, but the disadvantage is that it can easily cause smudges. Aspirated Collating Machine The aspirating collating machine is equipped with an evacuating robot arm that sucks paper through the end suction cup and places it on the conveyor belt. The machine separates the paper by blowing air through the air outlet to ensure the clean and accurate transport of the paper. Most printers today use suction-type collating machines. Because it does not cause smudges, it is also easier to handle coated or textured paper. Today's multi-color printing, the popularity of coated paper, and occasionally imported paper, provide a solid foundation for choosing a suction-type collating machine. For the post-press processing, the loss caused by the rework will be quite large, so the suction-type collating machine is often the necessary system. The following table shows the general choice of friction or suction equipment. Friction and suction contrast (+best* bad/unable) Friction type Aspirating type Description Printing multi-color* +Friction wheel is easy to cause stains, roller is easy to have offset materials, paper dust accumulation; suction type is not The impact of offset materials and paper scraps will not cause smudges. Thick coating / + field anti-white / + color toner copy / + friction wheel easy to contaminate the toner. Duplicating + + aspirating will not cause smudges. Material coating * +Friction wheel can easily cause smearing; suction work is gentle and there is no stain. Import/Friction type cannot process textured paper and recycled paper; suction is not limited. Matte/+friction affects frosted surfaces, which can cause work failure; air suction is harmless. IV Ecological printing is another year of environmental deterioration. Every day, the city is shrouded in a mist. The tingling throat and tears have always invaded us. The deterioration of the environment has reached a point where no remediation is possible. What responsibility should the printing industry bear, and what should the fast printers do? Chemicals in printing are the main cause of environmental pollution. We all know, but what comes into the printing shop is not finished product or waste. The harmful gases, solid wastes, and waste water generated during printing all destroy the environment in different ways. Think about the scene of a printing shop. Design patterns, negatives, inks, fountain solutions, and print cleaners do not contain chemicals. Which does not leave the same, either solid, or liquid and then gas waste? Therefore, finding suitable and safe supplies will help reduce or reduce environmental pollution. Vendors are obliged to find safer and more applicable chemicals regardless of their size, but this is not something that every fast-printing company can do. Large companies can assign special personnel or agencies to take charge of this work. Can small businesses do it? Do they have capital and energy? They can only rely on the outside world, that is, suppliers, to do a good job in this area. Indeed, ink manufacturers and various types of chemical manufacturers are also committed to solving the problems of ink, fountain solution, cleaning agents, etc. This problem is both the law and the most urgent requirement of customers. Large enterprises can appoint suppliers to solve some of their own common problems, while small companies should make full use of the research and efforts made by manufacturers in this regard and find solutions for themselves. In many publications, there are some manufacturers' corresponding products for specific issues. For example, reducing the volatilization of gases, reducing hazardous wastes, and cleaning up the discharge of waste water. The vegetable oil in the ink At present, the biggest achievement in the production of environmentally friendly offset inks is the method of adding soy oil as a volatile agent to the ink. The National Soy Ink Information Center's exhibition promotion work has been done for many years. In their brochures, more than 50 manufacturers of this type of ink are listed, and it is emphasized that soy inks are improving the atmosphere. The environment and the benefits of enhanced deinking capability in recycled paper production. Soybean oil or other vegetable oils have played a pivotal role in ink manufacturing. The replacement of chemical carbohydrate preparations with natural vegetable oils has become the accepted standard for most companies. The content of vegetable oil in sheetfed printing ink is generally between 20% and 35%, mainly soybean oil, peanut oil and corn oil. Gans Ink & Supply Co. Inc produced an ink called Soy Plus with a VOC content of less than 1%. Its raw material contains a little peanut oil, which is faster than traditional inks, stable ink, and suitable for a variety of coated or uncoated materials. In addition to soybean oil, various other vegetable oils also play an extremely important role in the manufacture of inks. The ink of the Dutch company Van Son is mainly made from linseed oil and rapeseed oil, plus some other vegetable oils. Ink manufacturing does not solve all ink-related waste problems, and many companies are using their inks to start thinking. Van Son is the company that bears the brunt of this. Headquartered in the Netherlands, Van Son is committed to providing printers with high quality, environmentally friendly products. Recognizing that much of the waste was caused by the contact of the ink tank with air after it was opened and a solidified layer was formed which made this part of the ink unusable, Van Son proposed a vacuum card tube ink packaging product. The ink is ejected from the nozzle of the tube to prevent other parts from coming into contact with the air, resulting in no solidified layer, which effectively reduces waste and saves ink. There are two ways for the ink nozzles of the ink tube to be used. One is a pneumatic spray gun, which is directly connected to the paper feeding compressor and controlled by a button; the other is a manual operation, in which the operator controls the lower handle of the ink tube. Van Son claims that one company that uses their products has saved about 20% of printing inks. In a year, printing companies not only saved a lot of production costs, but also produced less waste. The use of ink management ink management is very important. Every printer should know how to save, because when the waste ink is discarded, it is not only waste, but also a sum of money. In the work, printers generally use the method of mixing various colors of inks and formulating them into various colors according to the standards for a certain printing job. However, when this printing work is completed, the remaining ink of the mixture can only be set aside and I do not know when it will be used. With an ink management system, the computer can help printers calculate the various inks needed according to the printing capacity, reduce waste as much as possible, and can also mix the remaining inks each time they are finished to make another color. For the printing of the next batch of jobs, full use of ink, to its maximum extent realize its value. Computer management can also achieve the highest stability of color formulation. The color formulated according to the formula is fast and good, saving time and saving materials for printing companies. Through the computer can also achieve the ink inventory management, so that producers regularly know the remaining ink in the inventory, not only helps reduce the current consumption, but also cultivate a positive sense of saving work. Fountain solution fountain solution Ethanol removal is a popular trend in the printing industry. People are scrambling to use new products. However, while some new products have reduced or eliminated IPA, reducing the volatilization of dampening fluids, they have added other equally harmful, if not excessive, chemicals. Therefore, before using the new method, we must also pay attention to other issues such as waste discharge. The function of the fountain solution in printing is mainly reflected in the following seven aspects: 1. The fountain solution can form a layer of water film and isolate the direct contact between the ink and the background material; 2. It can maintain the hydrophilic property of the background material. 3, printing work, you can make the ink quickly from the background material, no adhesion; 4, can speed up the diffusion of water on the surface of the printing plate; 5, to maintain the water evenly in the dampening roller; 6, on the printing plate and Like skin cloth to play a role in lubrication; 7, control the emulsification of ink and water. From this point of view, the use of dampening solution is not a matter of simply replacing the alcohol with any other solvent. It is necessary to consider its effect on the printing effect and the relationship with the ink and printing plate. Personnel Safety Varn International is one of several well-known suppliers of short-run chemical printing formulations. It has been committed to adopting new technologies to provide printing operators with the safest production protection based on the protection of work efficiency and improved performance. It is an example of the production of Crystal 2500 fountain solution and non-alcohol PAR. Crystal 2500 contains no VOCs, while PAR contains a high melting point surfactant that can greatly reduce VOCs emissions. Its chemical formulation does not exceed 5 ounces per gallon of water and is fully compliant with the Air Cleaning Act. Of course, the use of this new type of dampening agent is not a matter of simply changing the agent. It requires the printer to contact the manufacturer to decide whether or not to make appropriate adjustments to the equipment. Some machines need to be replaced with a different hardness roller, and some require cooling devices. Different equipment requires different treatments to ensure the best printing results. Varn also developed a dampening system, Kompac, which automatically adjusts the ink balance, eliminating the need for alcohol and reducing waste by about half. Another Kompac II is a special dampening system. The dampening plate can be up to 18 inches in width. It uses a universal damper designed for minicomputers, Universal Pink. The printing ink can be printed in a short version. Or oily ink. The cleaning and cleaning solvents for printing presses and rubber blankets are the main causes of environmental pollution and have attracted widespread attention from all walks of life. The United States has issued a series of federal regulations and local regulations to regulate chemical production and improve the environment. The EPA joint printing community is launching a DfE (environmental design) program to conduct an experimental study of all printing presses and vinyl wipe cleaning solvents to determine their impact on the environment, personnel, and associated costs. At present, the EPA is headed by Mr. Karen Doershug. The Joint Graphic Arts Technology Foundation (GATF) and various printing associations, suppliers, printers, consulting agencies and other organizations publish an extensive content covering all kinds of printing detergents. Brochures to help small print companies choose the right cleaning products. Its core publication, "EPA Solutions for Lithographic Printers," aims to help printers understand the performance of existing solvents by comparing their existing rubber fabric cleaners with other products. , such as safety, performance, price and possible impact on the environment, to judge their products, to provide useful help for future work. Today, many manufacturers have produced safer printing presses and rubber cloth cleaners. Most of them are high-melting-point cleaners with high boiling points and low boiling points. They have water-based or water-soluble products. A key factor in determining a new product to replace an existing product is to consider the actual working conditions of the product, including the speed of drying of the solvent, the amount of grease that needs to be removed, and so on. The price aspect is also a factor that should be considered. Will using new products affect production? Will it increase the workload of the staff? All are questions that need to be answered. Alternative products may sometimes prolong the drying time or complicate the work, but if it is of great benefit to the environment and the human body, it is worthwhile to increase the amount of labor.