Overview of the manufacture and types of printing blankets
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A blanket for printing, which provides ink transfer for printing. The blanket has effective compression resistance, fast recovery, strong adhesion, no sticking, and smooth surface and fabric layer for ink transfer. Regardless of the stability of the dot or full version, 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 printed blankets
The printing blanket is made of multi-layer special fiber fabric and synthetic rubber compound. In the manufacturing process, the thermal energy and chemical energy of the fiber and rubber are combined in a precise control process, and different compounds and structures are given to the blanket. Different performance on the press.
The fabric layer of the printed blanket is different for each layer. The fabric layer is composed of synthetic and natural fibers, and the strength and the resistance are different for each layer.
Printing blankets can be divided into two types of composition:
Ordinary air cushion type
Fabric layer
Adhesive layer adhesive layer
Surface rubber
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 synthetic elastomer and particles. The particles contain air. The compressibility between the layers is determined by air cushion bubbles and rubber compounds. There are three types of blanket surface treatments. The first type of casting: the process of surface polishing using vulcanized paper. The second is grinding: the surface of the blanket is treated by a mechanical grinding process. The third is a chemical surface: the surface of the blanket must be treated with a specialized chemical structure. When it comes to the blanket layer, the printing blanket is composed of a multi-layered fabric. The number of layers refers to the number of layers of the fabric contained in the rubber. It is generally divided into three layers and four layers. Referring to the blanket pad, the blanket pad refers to the force of mutual compression between the plate and the blanket, between the blanket and the blanket, between the blanket and the printing roller or the rear roller. Press liners are one of the most effective parts of the printing process and a vital part of getting print quality. All printed blanket pads should have certain characteristics. Appropriate liners enhance the following characteristics: good print quality, blanket life, and blanket resilience. It can prevent ink accumulation, reduce plate wear, control the web, reduce the breakage of the web, and maintain good overprinting.
normal type
* Requires very accurate printing pressure
* Pushing too high will cause printing failure
* The nip width is different between shutdown and operation
* Collision damage
Air cushion type
* Allows slight deviation in printing pressure
* The pad is highly flexible
* The nip width is only slightly increased during shutdown and operation.
* Collision rebound
The steps to properly seal are as follows: 1. Understand the kerf distance between the blanket and the plate cylinder. 2. Measure the thickness of the blanket and its liner and plate and its liner. 3. Leave excess padding to compensate for the thickness of the blanket installation and honing and licking. [All blankets will have a thickness reduction of 0.001"-.002"/0.03mm-0.05mm] during installation. 4. Record the extrusion pressure. 5. Use a pad to measure the height of the blanket to determine the squeezing pressure. 6. Adjust the gasket to suit the printing conditions and understand the variables of the press for best results. In addition, pad thickness measurement is also very important.
Blanket thickness can be measured on the press or off-board, A. Off-camera measurement: Four-point measurement using the Cady gauge thickness gauge as determined by ISO standards. B. Measuring on a printing press: Using Cobra Mike measured three points on the roller. There are several different types of blanket locking systems on the press: such as T-row bars, double-winding bars, single-winding bars, etc., which lock the blanket.
The correct installation steps for the blanket are: 1. The press is in a standby safe state, and when the plate is installed, the leading end or the collet end of the blanket is placed in the winding rod or the locking system rod. 2. If necessary, insert the pad at the leading end of the blanket or the end of the clamp and fix it. 3. Turn off the printing press 4. Press the inching switch of the printing press to slowly rotate the roller, and roll out the blanket and the liner. 5. Place the press in a standby safe state and place the end of the blanket into the winding rod or the locking system stem.
The blanket tightening procedure is as follows: 1. Install the blanket correctly, tighten the blanket with the torque wrench and fix it according to the preset settings. 2. When the printing press is in the standby printing state, the blanket roller is rotated several times and is still tightened in this state. 3. Disconnect the pressure roller 〞 from the printing 〞 and tighten the blanket again. 4. Re-tighten the blanket when the press is first shut down. 5. The blanket is now properly tensioned and the blanket tension can only be adjusted in the event of a malfunction.
Finally, choose a blanket cleaner to briefly describe. The choice of cleaning agent should be considered for safety, flammability, relevant management regulations and cleaning effect. The strong cleaning agent has a good cleaning effect but causes the blanket to swell and eliminates the plasticizer in the blanket. The flexible cleaning agent takes a long time and more energy to clean, but does not damage the surface of the blanket. In addition, the drying speed and the choice of solvents designed to clean the surface of the blanket are the right way.
B. Overview of printing blankets
There are many types of printing blankets. The air cushion type blankets are divided into the following types. The following are only for reference:
1. Full air cushion type blanket: suitable for high speed rotation, printing machine and high speed leaflet machine. Resilience is best. It has the best resistance to stretching and long life. The surface is finely ground and compensates for poor quality paper, which improves the printing quality.
2. Air cushion rubber: for the performance of the full version and outlets. The surface is a mixture of layers that is easy to clean, long-term use, and the surface is not easily imprinted.
3. Three in one
Blanket: The laminated layer is integrally formed and can withstand the strongest in India; the middle air cushion layer is different from the general rubber blanket layering layer, which is easy to have bubbles, so that the product is easy to lose thickness due to printing pressure; it is not necessary to increase the replacement of the backing paper. frequency. The bottom is waterproof and solvent resistant, and will not be flat due to water absorption, resulting in uneven pressure. The surface of the blanket is specially charcoal-treated, and it is resistant to large and small, and it does not cause paper marks due to long printing.
4. General level air cushion blanket: most suitable for non-coated paper printing and cardboard printing. The surface grinding particle size is 6u ~ 8u, which is most suitable for paper printing with poor local papermaking.
5. Traditional blanket: economical and practical blanket for commercial printing. The surface is resistant to oil, so long-term cleaning with a solvent such as general gasoline is not easy, and it is not easy to cause glaze to be lighted and the rubber cloth to become sticky.
6.UV-specific blanket: Add anti-UV resin component to the blanket mixture, which can resist UV rays, and the rubber is not easy to be powdered. It is quick to recover and will not cause paper cuts due to size printing.
7. Partial glazing blanket: special splicing layer for local cutting purposes. At the junction of the cutting layer and the non-cutting layer, the hardness can be cut, the bearing capacity is uniform, and the glazing effect is improved. After cutting, tear open without burrs and smooth the glaze.
8. Metallic printing 2PSC blanket: A blanket specially developed for two-piece metal printing. Pre-coated self-adhesive is used. The gum is uniform and free of bubbles. Make the printing pressure more even.
9. Anti-friction blanket: The surface rubber mixture contains high hardness carbon molecules, which greatly improves the friction resistance. Applicable to the printed material of the uneven surface. The rubber surface is not easy to wear and prolongs the use time.
10. Paper cup special blanket: no bottom canvas layer, moderate hardness, so that the ink transfer is more complete. When double-sided tape is blended, even with cheap double-sided tape, the adhesion is greatly improved and it does not slip off, which saves expensive double-sided tape.
11.UV self-adhesive blanket: The viscosity of the adhesive is the best to prevent the tearing angle from being damaged. The rubber surface contains UV-resistant UV resin for extended life when used in UV printing.
12. Reporting machine self-adhesive blanket: The report printing machine uses the long-lasting gray blanket. The hardness is soft, and the foam is used, and the serviceability is better. To prevent softening of the rubber during storage, please pay attention to humidity and temperature.
13.Dunlop Reporting Machine Self-adhesive Blanket: High-viscosity adhesive, the glue is not easy to deform and degumming. Removing the blanket will not leave a residue that is difficult to remove. Good solvent resistance. Can be used in UV inks.
14. A variety of aluminum strip blankets.
There are many types of printing machines in the domestic printing industry, but mainly Japanese and European, as well as printing machines made in Taiwan, the United States, Eastern Europe and other countries. As long as these printing presses are lithographic printing presses, they must rely on the blanket transfer printing 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 heavy role in the printing process. The role. On the other hand, there are many materials agents for various types of blankets in China, but they are mainly used in Japan and Europe and the United States, and the choice of price and quality is also diversified, while the specifications, suitability, adjustment, maintenance, cleaning, etc. of blankets are diverse. Please refer to the original factory specifications for your purchase. In order to pursue good and beautiful printing quality, please take care of the blanket on your printing machine.