The non-watermark portion of the non-watermarked portion is sometimes easily scratched by the silicone rubber layer, exposing the photosensitive resin layer under which it absorbs ink. At this time it is necessary to use its special correction fluid (a kind of liquid silicone rubber) to repair the scratched part.
The biggest difference between waterless offset inks and traditional printing inks is the difference in the resin or binder used. Water-free ink binders should meet the rheological properties and have a higher viscosity than the binders in traditional printing inks.
The theoretical basis for waterless printing is that the surface energy of the non-graphical silicone rubber material on the printing plate is relatively low, and the viscosity of the waterless ink ensures that the affinity between the inks is greater than the affinity between the ink and the silicone rubber coating, so the silicone rubber The coating is ink-repellent.
(2) Temperature Control System One factor that affects viscosity is temperature. Removing the dampening solution from the offset printing process will reduce the cooling effect on the surface of the printing plate. Due to friction, the temperature on the plate will increase. Because the viscosity of the waterless ink is large, the friction between the waterless ink and the ink roller will also increase the temperature.
The function of the temperature control system is to circulate enough coolant in the tandem roller to take away the heat generated by the mechanical action of the printing unit. It should be noted that this temperature control system is not designed to cool the ink roller. It only controls the temperature to a constant value during the printing process. With a constant temperature, the viscosity of the waterless ink will also remain.
Waterless proofing cannot be done using conventional proofers. Because the traditional proofer, outlets are larger than waterless printing. Many waterless printers use digital proofing systems.
2. The Presstek System Presstek PEARLdry waterless version consists of two parts: a waterless version and a waterless ink similar to Toray.
Presstek claims that the temperature control system on the press is an option. PEARL dry no watermark version with a maximum capacity of 50,000 impressions. If the print volume is less than 10,000 prints, there is no effect on the temperature on the press. Only the long-run version requires a temperature control system. PEARL dry is not watermarked, but it can also be recycled. The maximum size is four open.
The PEARL dry waterless version consists of four layers: an ink-repellent silicone rubber layer, a light-absorbing imaging layer, an ink-receiving layer, an aluminum base or a polyester base layer. PEARL dry without watermark imaging, no need for film, no exposure, no processing. Its imaging uses mainly an ablation technique. Use an infrared laser diode to ablate the silicone rubber coating on the plate to expose the underlying ink-receptive layer. During imaging, the laser rapidly heats the imaging layer to record images. The imaging layer is evaporated and the upper silicone rubber coating is stripped from the plate to form a graphic. After the plate is imaged, it must be cleaned and automatically mounted on the plate cylinder.
The system can be imaged in machine imaging (such as the octal QMDI) or using the Presstek direct platemaker. The platesetter has eight open or four open formats.
Because of the backbone Postscipt system, proofing can also be a variety of digital proofing options: such as Iris's inkjet proofing and 3M's Rainbow proofing system.
Third, the main advantages of waterless printing:
· Protecting the environment: Without using fountain solution, it is very beneficial to environmental protection.
• Color consistency: Without a wetting system, the color change on the print is small during the printing process.
Color saturation: The four-color printing density is about 20% higher than the SWOP standard (web offset specification, commonly used ink set in the United States).
* Smaller dot gains: Good reproduction of details, small expansion of water-free printing dots, printable high-calorie lines, and good reproduction of details. Even with 175 lines/inch screens, waterless printing is quite good.
· Wide range of printing: waterless printing and printing on paper that cannot be used in traditional printing. Such as offset paper and so on. Without the wetting system, many paper problems disappeared in traditional printing.
• Short print preparation time: About 40% shorter than traditional print preparation time.
1. Waterless Printing and Environment (1) Environmental Protection Breakthrough. Fresh air, abundant water, dense forests, and safe working conditions are all environments that countries around the world are pursuing. However, in some places, the printing industry has caused serious damage to the environment. Waterless printing will make a great contribution to environmental protection.
(2) No longer use volatile organics. Waterless printing eliminates the use of volatile organics in fountain solutions. Some volatile organic compounds can destroy Earth's helium-oxygen layers, creating a warm-temperate effect on Earth. Now, using water-based inks, bid farewell to volatile organics.
The revolution in ink technology has eliminated the need for organic solvents in cleaning blankets, greatly reducing the emission of volatile organic compounds. The car wash water is made up of 93% water and 7% harmless surfactants (such as soap, etc.) , is a water-based cleaning agent. (To be continued)
The biggest difference between waterless offset inks and traditional printing inks is the difference in the resin or binder used. Water-free ink binders should meet the rheological properties and have a higher viscosity than the binders in traditional printing inks.
The theoretical basis for waterless printing is that the surface energy of the non-graphical silicone rubber material on the printing plate is relatively low, and the viscosity of the waterless ink ensures that the affinity between the inks is greater than the affinity between the ink and the silicone rubber coating, so the silicone rubber The coating is ink-repellent.
(2) Temperature Control System One factor that affects viscosity is temperature. Removing the dampening solution from the offset printing process will reduce the cooling effect on the surface of the printing plate. Due to friction, the temperature on the plate will increase. Because the viscosity of the waterless ink is large, the friction between the waterless ink and the ink roller will also increase the temperature.
The function of the temperature control system is to circulate enough coolant in the tandem roller to take away the heat generated by the mechanical action of the printing unit. It should be noted that this temperature control system is not designed to cool the ink roller. It only controls the temperature to a constant value during the printing process. With a constant temperature, the viscosity of the waterless ink will also remain.
Waterless proofing cannot be done using conventional proofers. Because the traditional proofer, outlets are larger than waterless printing. Many waterless printers use digital proofing systems.
2. The Presstek System Presstek PEARLdry waterless version consists of two parts: a waterless version and a waterless ink similar to Toray.
Presstek claims that the temperature control system on the press is an option. PEARL dry no watermark version with a maximum capacity of 50,000 impressions. If the print volume is less than 10,000 prints, there is no effect on the temperature on the press. Only the long-run version requires a temperature control system. PEARL dry is not watermarked, but it can also be recycled. The maximum size is four open.
The PEARL dry waterless version consists of four layers: an ink-repellent silicone rubber layer, a light-absorbing imaging layer, an ink-receiving layer, an aluminum base or a polyester base layer. PEARL dry without watermark imaging, no need for film, no exposure, no processing. Its imaging uses mainly an ablation technique. Use an infrared laser diode to ablate the silicone rubber coating on the plate to expose the underlying ink-receptive layer. During imaging, the laser rapidly heats the imaging layer to record images. The imaging layer is evaporated and the upper silicone rubber coating is stripped from the plate to form a graphic. After the plate is imaged, it must be cleaned and automatically mounted on the plate cylinder.
The system can be imaged in machine imaging (such as the octal QMDI) or using the Presstek direct platemaker. The platesetter has eight open or four open formats.
Because of the backbone Postscipt system, proofing can also be a variety of digital proofing options: such as Iris's inkjet proofing and 3M's Rainbow proofing system.
Third, the main advantages of waterless printing:
· Protecting the environment: Without using fountain solution, it is very beneficial to environmental protection.
• Color consistency: Without a wetting system, the color change on the print is small during the printing process.
Color saturation: The four-color printing density is about 20% higher than the SWOP standard (web offset specification, commonly used ink set in the United States).
* Smaller dot gains: Good reproduction of details, small expansion of water-free printing dots, printable high-calorie lines, and good reproduction of details. Even with 175 lines/inch screens, waterless printing is quite good.
· Wide range of printing: waterless printing and printing on paper that cannot be used in traditional printing. Such as offset paper and so on. Without the wetting system, many paper problems disappeared in traditional printing.
• Short print preparation time: About 40% shorter than traditional print preparation time.
1. Waterless Printing and Environment (1) Environmental Protection Breakthrough. Fresh air, abundant water, dense forests, and safe working conditions are all environments that countries around the world are pursuing. However, in some places, the printing industry has caused serious damage to the environment. Waterless printing will make a great contribution to environmental protection.
(2) No longer use volatile organics. Waterless printing eliminates the use of volatile organics in fountain solutions. Some volatile organic compounds can destroy Earth's helium-oxygen layers, creating a warm-temperate effect on Earth. Now, using water-based inks, bid farewell to volatile organics.
The revolution in ink technology has eliminated the need for organic solvents in cleaning blankets, greatly reducing the emission of volatile organic compounds. The car wash water is made up of 93% water and 7% harmless surfactants (such as soap, etc.) , is a water-based cleaning agent. (To be continued)
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