Manufacturing and types of the hottest printing bl

2022-07-24
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Manufacturing and types of printing blanket

printing blanket, which provides ink transfer during printing, has effective compression resistance, fast recovery, strong viscosity, and does not leave any adhesive. Its smooth surface layer and fabric layer make the ink transmission more stable or the full version more stable. As a transfer unit, blanket plays an important role in the printing process without blanket, The printing cannot be completed

a. manufacturing of printed blanket

printed blanket is made of multi-layer special fiber fabric and synthetic rubber compound. During the manufacturing operation, the fiber fabric and rubber are combined with thermal and chemical energy in a precisely controlled process. In addition, different compounds and structures endow the blanket with different properties on the printing machine

the fiber layer of printed rubber blanket is different from each other. The fiber layer is composed of synthetic and natural fibers, and the strength and durability of each layer are different. Transfer from hard and brittle form to sticky and strong form

printing rubber cloth can be divided into two types of composition:

ordinary air cushion type

fiber fabric layer

adhesive layer

surface rubber air cushion layer

comparison between ordinary type and air cushion type: when it comes to air cushion layer, the air cushion layer is in the state of closed particles, which is composed of synthetic elastomer and particles, and the particles contain air, The compressibility between layers is determined by air cushion layer bubbles and rubber compounds. There are three types of rubber blanket surface treatment. The first type is coating casting: the process of using vulcanized paper to form surface polishing. The second is grinding: the surface of the blanket is treated by mechanical grinding process. The third is 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 fabric. The number of layers refers to the number of fiber fabric layers contained in the rubber, which is generally divided into three layers and four layers. When it comes to blanket pad, Blanket Pad refers to the mutual extrusion force between the printing plate and blanket, between blanket and blanket, between blanket and printing roller or rear roller. The printer pad is one of the most effective parts in the printing process, and it is also a crucial link to obtain printing quality. All printing blanket liners should have certain characteristics. Appropriate liners will enhance the following characteristics: good printing quality, service life of blanket, and resilience of blanket. It can prevent ink piling, reduce the wear of printing plate, control the web well, reduce the breakage of web, and maintain good overprint

ordinary type

* requires very accurate printing pressure

* too high pad will cause printing failure

* roll gap width is different in shutdown and operation states

* collision damage

air cushion type

* allows slight deviation in printing pressure

* pad height flexibility is large

* roll gap width is only slightly increased in shutdown and operation states

* collision rebound

the steps for correct gasket are as follows: 1 Understand the notch distance of blanket and plate cylinder. 2. measure the thickness of blanket and its liner, printing plate and its liner. 3. leave extra padding to compensate for the thickness of blanket installation and "grinding". (all 2 rubber sheets that attach great importance to the construction of new material industry system will have a thickness decrease of 0.001 "-.002"/0.03mm-0.05mm during installation). 4. record the extrusion pressure. 5. measure the blanket height with a pad gauge to determine the extrusion pressure. 6. adjust the pad to adapt to the printing conditions and understand the variable factors of the printing machine to achieve the best results. In addition, the measurement of liner thickness is also very important

the blanket thickness can be measured on the printing press or off the machine. A. off the machine measurement: use the Cady gauge thickness meter to measure at the four points determined by the ISO standard. B. Measurement on the printer: use Cobra Mike 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 rod, double winding rod, single winding rod, etc. to lock the blanket

the correct installation steps for the blanket are as follows: 1 When the printer is in the standby safe state and the printing plate is installed, put the guide end or collet end of the blanket into the winding rod or locking system rod for fixation. 2. if necessary, insert the gasket into the guide end or collet end of the blanket and fix it. 3. turn off the printer 4 Press down the inching switch of the printing machine and slowly rotate the roller to roll out the blanket and liner. 5. put the printer in the standby safe state and put the end of the blanket into the winding rod or locking system rod

the rubber blanket tightening procedure is: 1 Install the blanket correctly, tighten the blanket with a torque wrench according to the predetermined setting and fix it. 2. when the printer is in the "standby printing" state, rotate the blanket roller several times and tighten it again under this state. 3. press the material pressure roller to "disconnect printing" and tighten the blanket again. 4. when the printing press stops for the first time, tighten the blanket again. 5. the tension of the blanket is appropriate now. The tension of the blanket can be adjusted only in case of failure

finally, choose the blanket cleaner for a brief introduction. The factors to be considered in the selection of cleaning agent are safety, flammability, relevant management regulations and cleaning effect. The strong detergent has good cleaning effect, but it will cause the rubber cloth to swell and eliminate the plasticizer in the rubber cloth. The flexible detergent takes a long time and more energy to clean, but will not damage the surface of the rubber cloth. In addition, the drying speed and the choice of solvents specially designed for cleaning the surface of the blanket are the right way

b. overview of types of printed blanket

there are many types of printed blanket. The air cushion blanket is divided into the following types. The following only refers to the microcomputer control system for the automatic control of various modes of experimental force, displacement and deformation:

1 Full air cushion blanket: suitable for high-speed rotary, newspaper printing machine and high-speed leaf tensioning machine. The recovery elasticity is the best. It has the best telescopic resistance and long service life. The surface grinding is exquisite, which can compensate the poor paper quality and improve the printing quality

2. Air cushion rubber: for full size and dot performance. The surface is a mixture layer, easy to clean, long-term use, the surface is not easy to leave an impression

3. Three in one blanket: the laminating layer is formed as a whole, which can resist the strongest in India; The air cushion layer in the middle is different from the common rubber blanket, which is mounted layer by layer. It is easy to have bubbles and the product is easy to lose its thickness due to printing; It is not necessary to increase the frequency of changing the backing paper. The bottom is waterproof and solvent proof, and will not be uneven due to water absorption, resulting in uneven pressure. The rubber cloth surface is specially treated with carbon, which is resistant to large and small versions, and will never produce paper marks due to long printing volume

4. General air cushion blanket: most suitable for uncoated paper printing and Paperboard Printing. The surface grinding particle size is 6U ~ 8U, which is most suitable for printing on paper with poor local papermaking

5. Traditional blanket: Economic and practical blanket for commercial printing. The surface has good oil resistance, so it is not easy to cause glaze glossing and sticky rubber cloth even if it is cleaned with general gasoline and other solvents for a long time

special blanket: anti UV resin is added to the blanket mixture, which can resist UV and the rubber is not easy to powdered. Fast recovery, no paper cutting marks due to large and small version printing

7. Local glazing blanket: special laminating layer, used for local cutting. At the junction of cutting layer and non cutting layer, the hardness is resistant to cutting, the bearing capacity is uniform, and the glazing effect is improved. After cutting, it shall be torn without burrs and polished smoothly

8. Metal printing 2psc blanket: blanket specially developed for two-piece metal printing. Pre coated self-adhesive is used. The colloid is uniform without bubbles. Make the printing pressure more even

9. Friction resistant blanket: the surface rubber mixture contains high hardness carbon molecules, which greatly improves the friction resistance. Suitable for printing materials with concave and convex surfaces. The rubber surface is not easy to wear and prolong the service time

10. Special blanket for paper cup: no bottom canvas layer, moderate hardness and softness, making ink transfer more complete. When mounting the double-sided tape, (even with cheap double-sided tape), the adhesion is greatly improved and will not slip off, which can save expensive double-sided tape expenses

self adhesive blanket: the adhesive viscosity is the best to prevent damage of tear angle. The rubber cover contains anti UV resin, which can prolong the service life when used for UV printing

12. Report machine self-adhesive blanket: gray blanket used by report printing machine for a long time. The hardness is soft, and the foam rubber is used, with good serviceability. Please pay attention to humidity and temperature to prevent the glue from softening during storage

nlop report machine self-adhesive blanket: high viscosity adhesive, which is not easy to deform and degumm. Removing the rubber blanket will not leave residues that are difficult to remove. Good solvent resistance. Can be used for UV inks

14. All kinds of rubber cloth with aluminum strips

there are many kinds 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 all rely on blanket transfer to complete the printing process. The quality of blanket also affects the quality of printing. It can be seen that blanket plays a very important role in the printing process. On the other hand, there are many material agents for various kinds of blanket in China, but the main source of goods is made in Japan and Europe and the United States, and the choice of price and quality is also diversified. Please refer to the specifications and instructions of the original factory 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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