Knowledge expansion of the hottest blanket

2022-08-22
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Blanket knowledge development

blanket for printing, which provides ink transfer during printing. Blanket has effective compression resistance, fast recovery, strong viscosity, and does not leave any adhesive. Its smooth surface and fabric layer make the ink transmission more stable. Blanket, as a transfer unit, plays an important role in the printing process. Without blanket, 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

printed rubber cloth can be divided into two types:

ordinary air cushion type

fiber layer fiber layer

adhesive layer

surface rubber air cushion layer

surface rubber

comparison between ordinary and air cushion types: when it comes to air cushion layer, air cushion layer is in the state of closed particles, which is composed of synthetic elastomer and particles, and particles contain air, The compressibility between layers is determined by air cushion layer bubbles and rubber compounds. The surface treatment of rubber blanket is divided into three types. The first type is coating casting: the process of using vulcanized paper to form surface polishing. The second is grinding: the surface of rubber blanket is treated by mechanical grinding process. The third is chemical surface: the surface of rubber blanket must be treated by a professional chemical structure. Speaking of blanket layer, 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 at most. Speaking of 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 printing machine pad is one of the parts that need to be effectively controlled 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 the printing plate, control the web well, reduce the breakage of the web, and maintain a good overprint

ordinary type

* requires that the printing pressure is very accurate

* too high pad will cause printing failure

* the width of roll gap is different in the shutdown and operation states

* collision damage

air cushion type

* allows a slight deviation in the printing pressure

* the pad height is flexible

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

* collision rebound

when it comes to the correct gasket, the steps 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". The thickness of all rubber sheets will decrease by 0.001 - 002/0.03mm-0.05mm﹞。 4. Record the extrusion pressure. 5. Use a liner gauge to measure the height of the blanket 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 effect. In addition, the measurement of liner thickness is also very important

the thickness of rubber blanket can be measured on the printing press or off the machine. A. off the machine measurement: use cadygauge thickness meter to measure at four points determined by ISO standard. B. Measure on the printer: use cobramike to measure the three points on the roller. There are several different types of blanket locking systems on the printing machine: such as T-bar, double winding bar, single winding bar, etc. to lock the blanket

the correct installation steps of rubber blanket are: 1 When the printing machine 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 tightening procedure of rubber blanket is: 1 The important problem of correct installation is to choose the correct connection solution to install the blanket, and tighten and fix the blanket with the torque wrench according to the predetermined setting. 2. When the printer is in the "standby printing" state, turn the blanket roller several times and tighten it again when it is still in this state. 3. Make the pressure roller "disconnect printing" and tighten the blanket again. 4. When the printing machine 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 blanket cleaner to briefly describe. 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 does not damage the surface of the rubber cloth. In addition, the drying speed and the choice of solvent specially designed for cleaning the surface of blanket are the right way

b. overview of types of printed blanket

there are many types of printed blanket. Air cushion blanket is divided into the following types, and the following is only for reference:

1 Full accuracy is not easy to guarantee air cushion blanket: suitable for high-speed rotary, newspaper printing machine and high-speed leaf tensioning machine. The resilience is the best. It has the best telescopic resistance and long service life. The surface grinding is exquisite, which can compensate the poor quality paper and improve the printing quality

2. Air cushion rubber: for full version and dot performance. 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 formed as a whole, which can resist the strongest in India; The air cushion layer in the middle is different from the general rubber blanket, which is mounted layer by layer. It is easy to have bubbles, which makes the product easy to lose thickness due to printing; There is no need 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 paper printing with poor local papermaking

5. Traditional blanket: Economic and practical blanket for commercial printing. The surface has good oil resistance, so even if you use general gasoline and other solvents for long-term cleaning, it is not easy to cause glaze gloss and sticky rubber cloth

special blanket: UV resistant resin is added to the blanket mixture, which can resist UV, and the rubber is not easy to powdered

it has fast recovery and will not produce paper cuts 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 can withstand cutting, the bearing capacity is uniform, and the glazing effect is improved. After cutting, tear it without burrs and polish it 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 carbon molecules with high hardness, 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 soft and hardness, making the ink transfer more complete. When mounting double-sided tape, (even with cheap double-sided tape), the adhesion is greatly improved, and it will not slip, which can save expensive double-sided tape expenses

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

12. Self adhesive blanket of report machine: gray blanket that has been used by report printing machine for a long time. The hardness is relatively soft, and the foam rubber is used, which has better 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 blanket will not leave residues that are difficult to remove. Good solvent resistance. It can be used for UV ink

14. All kinds of rubber blanket 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. The special materials, additives, functional materials, special chemicals and other products produced by these printing machines are widely used in all fields of people's daily life. As long as the lithographic printing machine relies on the rubber blanket to transfer the printing lines to complete the printing process, the quality of the rubber blanket also affects the printing quality. It can be seen that the rubber blanket plays a very important role in the printing process as the introduction of professional management companies. On the other hand, there are many material agents of all kinds of rubber 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 rubber blanket on your printing machine

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