Rubber blanket for printing, which provides ink transfer during printing. The rubber blanket has effective pressure resistance, fast recovery, strong adhesion, and does not leave any stickers. Its smooth surface and fabric layer make the ink transfer Regardless of whether the dot or full version is more stable, the transfer unit of the blanket plays an important role in the printing process. Without the blanket, the printing cannot be completed.
A. Manufacturing of printing blankets
Printing blankets are made of multiple layers of special fiber fabrics and synthetic rubber compounds. During manufacturing operations, the thermal energy and chemical energy of fiber fabrics and rubber are combined in a precisely controlled process. In addition, different compounds and structures endow the blanket Different performance on the printing press.
The fiber fabric layer of the printing blanket is different for each layer. The fiber fabric layer is composed of synthetic and natural fibers, and the strength and resistance are different for each layer.
Printing blankets can be divided into two types:
Ordinary air cushion type
Fiber fabric layer
Adhesive layer Adhesive layer
Surface rubber air cushion
Surface rubber
Comparison between ordinary type and air cushion type: When it comes to the air cushion layer, the air cushion layer is in the state of closed particles. It consists of a synthetic elastomer and particles. The particles contain air. The compressibility between the layers is determined by the air cushion layer bubbles and rubber compounds. The surface treatment of blankets is divided into three types, the first one is casting: the process of forming surface polishing using vulcanized paper. The second is grinding: the surface of the blanket is processed by a mechanical grinding process. The third is the chemical surface: the surface of the blanket must be treated with a professional chemical structure. Speaking of the blanket layer, the printed blanket is composed of multiple layers of fiber fabrics. The number of layers refers to the number of fiber woven layers contained in the rubber, which is generally divided into three layers and four layers at most. Speaking of blanket pads, blanket pads refer to the force of mutual squeezing between the printing plate and the blanket, between the blanket and the blanket, and between the blanket and the printing roller or the rear roller, Printing machine liner is one of the most effective parts in the printing process, and it is also an important part of obtaining printing quality. All printed blankets should have certain characteristics. Appropriate pads will enhance the following characteristics: good printing quality, the life of the blanket, and the resilience of the blanket. It can prevent ink stacking, reduce plate wear, good control of the roll paper, reduce the breakage of the roll paper, and maintain a good overprint.
Common type a. Requires very accurate printing pressure
b. High pads can cause printing problems
c. Roll gap width is different in shutdown and running state
d. Damaged by collision
Air cushion type
a. Allow slight deviation of printing pressure
b. Highly flexible cushion
c. The width of the nip increases only a small amount during shutdown and operation
d. Collision rebound
The correct padding steps are as follows: 1. Understand the cutting groove distance of the blanket and plate roller. 2. Measure the thickness of the blanket and its pad and the printing plate and its pad. 3. Leave extra padding to compensate for the thickness of the blanket installation and grinding and grinding. ? All blankets will be 0.001 "-. 002" /0.03mm-0.05mm thick when installed. 4. Record the squeeze pressure. 5. Use the pad gauge against the height of the blanket to determine the squeeze pressure. 6. Adjust the pad to suit the printing conditions and understand the variable factors of the printing machine to achieve the best results. In addition, pad thickness measurement is also very important.
The thickness of the blanket can be measured on the printing machine or off-machine. A. Off-machine measurement: use the Cadygauge thickness gauge to measure at four points determined by the ISO standard. B. Measurement on the printing press: CobraMike is used to measure three points on the roller. There are several different types of blanket locking systems on the printing press: such as T-line stop bar, double winding rod, single winding rod, etc. to lock the blanket.
The correct installation steps for the blanket are: 1. When the printing press is in a safe state of standby and the printing plate has been installed, put the leading end or collet end of the blanket into the winding rod or locking system rod to fix it. 2. If necessary, insert the gasket at the leading end of the blanket or the end of the collet and fix it. 3. Turn off the printing press 4. Press the inching switch of the printing press and slowly turn the roller to roll out the blanket and liner. 5. Put the printing machine in the standby safe state and put the end of the blanket into the winding rod or locking system rod.
The procedure for tightening the blanket is as follows: 1. Install the blanket correctly, and use the torque wrench to tighten and fix the blanket in accordance with the predetermined settings. 2. When the printing machine is in the standby printing state, turn the blanket roller several times and still tighten in this state. 3. Make the pressure roller disconnect the printing and tighten the blanket again. 4. When the printing press stops for the first time, tighten the blanket again. 5. The blanket is now properly tensioned, and the blanket tension can only be adjusted when a fault occurs.
Finally, choose a blanket cleaner to briefly describe. The selection of cleaning agent needs to consider factors, such as safety, flammability, relevant management regulations and cleaning effect. The strong cleaning agent has a good cleaning effect but will cause the blanket to swell and eliminate the plasticizer in the blanket. The flexible cleaning agent takes longer time and more energy to clean, but does not damage the surface of the blanket. In addition, the speed of drying and the choice of solvents designed specifically for cleaning the surface of the blanket are the correct ways.
B. Overview of types of printing blankets
There are many types of printing blankets. Air cushion blankets are divided into the following types. The following are for reference only:
1. Full air cushion type blanket: suitable for high-speed rotation, printing presses and high-speed leaf-leaving machines. Resilience is the best. It has the best stretch resistance and long life. The surface is exquisitely polished, which compensates for the poor quality paper and improves the printing quality.
2. Air cushion type rubber: give consideration to the performance of full version and outlets. The surface is a mixture layer, easy to clean, long-term use, the surface is not easy to leave marks.
3. Three-in-one blanket: The lamination layer is integrally formed, which can withstand the strongest in India; the middle air cushion layer is different from the ordinary blanket to be laminated layer by layer, which is prone to bubbles and makes the product easy to lose thickness due to printing pressure; Increase the frequency of replacing the backing paper. The bottom is waterproof and solvent-proof, and will not be uneven due to water absorption, causing uneven pressure. The surface of the blanket is specially treated with carbon, resistant to large and small plates, and no paper marks will be produced due to long printing volume.
4. General-grade air cushion blanket: It is most suitable for uncoated paper printing and cardboard printing. The surface grinding particle size is 6u ～ 8u, which is most suitable for the printing of paper with poor local papermaking.
5. Traditional blanket: economical and practical blanket for commercial printing. The surface has good oil resistance, so even if it is cleaned for a long time with general gasoline and other solvents, it is not easy to cause the phenomenon of glaze photochemical and rubber stickiness.
6. Special blanket for UV: Anti-UV resin component is added to the mixture of the blanket, which can resist UV and ultraviolet light, and the rubber is not easy to powder. Fast recovery, no paper cuts due to printing of large and small plates.
7. Partial glazing blanket: special mounting layer, used for partial cutting purposes. At the junction of the cutting layer and the non-cutting layer, the hardness is resistant to cutting, the bearing capacity is uniform, and the glazing effect is improved. After cutting, tear off the burr-free and smooth.
8. Metal printing 2PSC blanket: a blanket specially developed for two-piece metal printing. Use pre-coated self-adhesive. The colloid is uniform without bubbles. Make the printing pressure more even.
9. Friction-resistant blanket: The surface rubber mixture contains carbon molecules with high hardness, which greatly improves the friction resistance. Suitable for printed materials with uneven surface. The rubber surface is not easy to wear and prolong the use time.
10. Special rubber blanket for paper cups: no bottom canvas layer, moderate softness and hardness, making the ink transfer more complete. When laminating double-sided tape, the adhesion (even with cheap double-sided tape) is greatly improved, will not slip off, and can save expensive double-sided tape expenditure.
11.UV self-adhesive rubber cloth: the adhesive viscosity is the best to prevent the tearing angle damage. The rubber surface contains UV-resistant resin, which can extend the life when used in UV printing.
12. Self-adhesive blanket for report machine: The gray blanket used for long time in the report printer. The hardness is relatively soft, and the foam adhesive is adopted, which has better serviceability. To prevent softening of the glue during storage, please pay attention to humidity and temperature.
13.Dunlop report machine self-adhesive rubber cloth: high viscosity adhesive, the glue is not easy to deform and degumming. Removing the blanket will not leave residue that is difficult to remove. Good solvent resistance. Can be used for UV inks.
14. Various rubber blankets with aluminum strips.
There are many types of printing machines in the domestic printing industry, but they are mainly Japanese and European. In addition, there are printing machines made in Taiwan, the United States, Eastern Europe and other countries. As long as these printing machines are lithographic printing machines, they need to transfer the pattern to complete the printing process. The quality of the blanket also affects the quality of the printing. It can be seen that the blanket plays a very important role in the printing process. Role. On the other hand, there are many materials agents for various types of blankets in China, but the main sources of supply are made in Japan, Europe and America, and the choice of price and quality is also diversified. , Please refer to the original specifications of the manufacturer as the basis for your purchase, in order to pursue good and exquisite printing quality, please take good care of the blanket on your printing machine.
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