Toray System
The Toray waterless printing system consists of three parts: a waterless version, a specially configured waterless printing ink, and a printing device with a temperature control system.
The Toray waterless version is multi-laminated, with the bottom layer being aluminum-based and coated with a layer of light-sensitive polymeric material. This is the middle layer and the top layer is 2 micron-sized silicone. Rubber layer. Depending on the type of Toray waterless version, the print rate is from 150,000 to 600,000 impressions. This data is based on plain copperplate paper. If the surface of the paper is rough, the print resistance will decrease to some extent. The Toray waterless version is recyclable, just like the traditional recyclable PS version. Toray plates are ideal for a variety of sheetfed and web offset presses.
The exposure of this printing plate can also use the traditional vacuum squeegee and light source, and the exposure time is similar to the exposure time of the traditional printing plate. At the time of exposure, the amount of UV light is controlled by the size of the density on the film so that the light penetrates the silicone layer onto the intermediate photopolymer layer. The photoreaction on the photopolymer layer is very precise, the resolution of the printing plate is very high, it can reach 175 lines/inch, and the outlet dot range is 0.5%-99.5%. The following figure shows the imaging mechanism of traditional wet and non-watermark versions.
![]()
After exposure, the printing plate is developed and the development process is very simple. The device for waterless plate development is different from the conventional developing device in that it applies special chemical reagents and processes the mechanical structure of the printing plate. The treated plate is an ink-repellant silicone layer in the non-graphic area. In the graphic area, the silicone layer has been removed leaving the ink-imprinted photopolymerizable material. The plate can be designed to selectively adsorb and repel ink without using any water or alcohol.
The main difference between waterless inks and traditional inks is the difference between the resin and the binder used. The printing material of the waterless printing ink is selected according to its rheology, and it is higher than the binder of the traditional ink. The principle of waterless printing is that the silicone layer in the non-image area of ​​the printing plate has a lower surface energy. If the viscosity of the ink is relatively high, the force that the molecules themselves attract each other is higher than the affinity with silicone. The material here has a strong ink repellency.
The main factor affecting the viscosity is temperature. Since there is no water involved in the waterless printing process, a material that cools the surface temperature of the printing plate is lost. Due to friction, the temperature of the surface of the plate cylinder will continue to rise. At the same time, since the viscosity of the water-free ink is high, the process of grinding the ink on the drum also causes the temperature of the drum surface to rise.
This is why there is a need for precise temperature control on waterless printing equipment. The most popular system uses vibration refrigeration technology, in the cooling process, the hollow vibration cooling roller in the ink wheel pulls out the coolant. This structure has been used for many years on high-speed web offset presses. Now that it has been improved, it has also begun to be applied to sheet-fed printing equipment. Almost all sheet-fed press manufacturers offer hollow ink vibratory rollers to control the temperature. The following figure shows a typical temperature control system for a waterless printer. The number of ink vibrating rollers is different, and the effect of temperature control is also different.
![]()
The function of the temperature control system is to circulate the refrigerant through the trajectory of the roller, removing the heat generated by the mechanical movement of the printing unit.
It is worth noting that this type of system is not designed for cooling (or cooling) of the ink roller, but merely to maintain the normal temperature at which the printer normally operates. Only by maintaining a constant temperature, the viscosity of the ink can be maintained to its best. The figure below shows the optimal temperature task window in the temperature control system for waterless printing.
![]()
Waterless proofing can be done directly on film. Note that not all analog systems can reproduce the low dot gain of waterless printing. Some experienced waterless printing companies provide high-precision proofs, and some waterless printing companies use calibrated digital proofing systems to produce samples, and they have also achieved good results.
Presstek System
The Presstek PEARLdry printing system consists of two parts: printing plates and specially formulated waterless inks, whose inks are very similar to those used by Toray.
According to Presstek, whether to install a temperature control system is a choice for printing companies. However, in order to obtain a higher endurance rate, it is recommended to install a temperature control system. The PEARLdry plate has a maximum print rate of 50,000. PEARLdry plates are also recyclable, with the largest plate size being 23.75" x 29.4" (four open). The following figure shows the PEARLdry ABL negative plate used in waterless printing.
![]()
Like the Toray plate, the top layer of the PEARLdry plate is also a silicon repellent layer. The middle is a photosensitive layer, which can absorb ink, and can maintain the stability of the plate size.
The plates are imaged and exposed without the need for film and film development. The imaging technology it uses is called ablation technology. An array of IR (infrared) laser diodes is used to remove the silicone image layer and the underlying aluminum or polyester layer is exposed to allow the ink to be absorbed. During imaging, the laser processes the image area by rapidly heating the image layer. The resulting gas expansion causes the image and upper silicone layer to separate from the plate. After the plate is imaged, the plate is peeled off and mounted on the press. The system can directly image the plate on the press (8-up A3 format GTP-DI or Quickmaster DI), or it can be imaged off-line using Presstek's PEARLsetter. The images taken offline have 8 open A3 format (15.75" x 20") and 4 open A2 format (23.75" x 29.4"). With a web size of 40 inches (102 cm), the image of the split printing plate can be completed on a thermal plate processor. With the continuous emergence of other Postscript systems, various types of digital proofing systems can be used for proofing waterless printing, such as Iris inkjet printers and 3M's Rainbow.
The Toray waterless printing system consists of three parts: a waterless version, a specially configured waterless printing ink, and a printing device with a temperature control system.
The Toray waterless version is multi-laminated, with the bottom layer being aluminum-based and coated with a layer of light-sensitive polymeric material. This is the middle layer and the top layer is 2 micron-sized silicone. Rubber layer. Depending on the type of Toray waterless version, the print rate is from 150,000 to 600,000 impressions. This data is based on plain copperplate paper. If the surface of the paper is rough, the print resistance will decrease to some extent. The Toray waterless version is recyclable, just like the traditional recyclable PS version. Toray plates are ideal for a variety of sheetfed and web offset presses.
The exposure of this printing plate can also use the traditional vacuum squeegee and light source, and the exposure time is similar to the exposure time of the traditional printing plate. At the time of exposure, the amount of UV light is controlled by the size of the density on the film so that the light penetrates the silicone layer onto the intermediate photopolymer layer. The photoreaction on the photopolymer layer is very precise, the resolution of the printing plate is very high, it can reach 175 lines/inch, and the outlet dot range is 0.5%-99.5%. The following figure shows the imaging mechanism of traditional wet and non-watermark versions.
After exposure, the printing plate is developed and the development process is very simple. The device for waterless plate development is different from the conventional developing device in that it applies special chemical reagents and processes the mechanical structure of the printing plate. The treated plate is an ink-repellant silicone layer in the non-graphic area. In the graphic area, the silicone layer has been removed leaving the ink-imprinted photopolymerizable material. The plate can be designed to selectively adsorb and repel ink without using any water or alcohol.
The main difference between waterless inks and traditional inks is the difference between the resin and the binder used. The printing material of the waterless printing ink is selected according to its rheology, and it is higher than the binder of the traditional ink. The principle of waterless printing is that the silicone layer in the non-image area of ​​the printing plate has a lower surface energy. If the viscosity of the ink is relatively high, the force that the molecules themselves attract each other is higher than the affinity with silicone. The material here has a strong ink repellency.
The main factor affecting the viscosity is temperature. Since there is no water involved in the waterless printing process, a material that cools the surface temperature of the printing plate is lost. Due to friction, the temperature of the surface of the plate cylinder will continue to rise. At the same time, since the viscosity of the water-free ink is high, the process of grinding the ink on the drum also causes the temperature of the drum surface to rise.
This is why there is a need for precise temperature control on waterless printing equipment. The most popular system uses vibration refrigeration technology, in the cooling process, the hollow vibration cooling roller in the ink wheel pulls out the coolant. This structure has been used for many years on high-speed web offset presses. Now that it has been improved, it has also begun to be applied to sheet-fed printing equipment. Almost all sheet-fed press manufacturers offer hollow ink vibratory rollers to control the temperature. The following figure shows a typical temperature control system for a waterless printer. The number of ink vibrating rollers is different, and the effect of temperature control is also different.
The function of the temperature control system is to circulate the refrigerant through the trajectory of the roller, removing the heat generated by the mechanical movement of the printing unit.
It is worth noting that this type of system is not designed for cooling (or cooling) of the ink roller, but merely to maintain the normal temperature at which the printer normally operates. Only by maintaining a constant temperature, the viscosity of the ink can be maintained to its best. The figure below shows the optimal temperature task window in the temperature control system for waterless printing.
Waterless proofing can be done directly on film. Note that not all analog systems can reproduce the low dot gain of waterless printing. Some experienced waterless printing companies provide high-precision proofs, and some waterless printing companies use calibrated digital proofing systems to produce samples, and they have also achieved good results.
Presstek System
The Presstek PEARLdry printing system consists of two parts: printing plates and specially formulated waterless inks, whose inks are very similar to those used by Toray.
According to Presstek, whether to install a temperature control system is a choice for printing companies. However, in order to obtain a higher endurance rate, it is recommended to install a temperature control system. The PEARLdry plate has a maximum print rate of 50,000. PEARLdry plates are also recyclable, with the largest plate size being 23.75" x 29.4" (four open). The following figure shows the PEARLdry ABL negative plate used in waterless printing.
Like the Toray plate, the top layer of the PEARLdry plate is also a silicon repellent layer. The middle is a photosensitive layer, which can absorb ink, and can maintain the stability of the plate size.
The plates are imaged and exposed without the need for film and film development. The imaging technology it uses is called ablation technology. An array of IR (infrared) laser diodes is used to remove the silicone image layer and the underlying aluminum or polyester layer is exposed to allow the ink to be absorbed. During imaging, the laser processes the image area by rapidly heating the image layer. The resulting gas expansion causes the image and upper silicone layer to separate from the plate. After the plate is imaged, the plate is peeled off and mounted on the press. The system can directly image the plate on the press (8-up A3 format GTP-DI or Quickmaster DI), or it can be imaged off-line using Presstek's PEARLsetter. The images taken offline have 8 open A3 format (15.75" x 20") and 4 open A2 format (23.75" x 29.4"). With a web size of 40 inches (102 cm), the image of the split printing plate can be completed on a thermal plate processor. With the continuous emergence of other Postscript systems, various types of digital proofing systems can be used for proofing waterless printing, such as Iris inkjet printers and 3M's Rainbow.
Milk Storage Bag,Breast Milk Cooler Bag,Breast Milk Storage,Breast milk Bag
Zhejiang Carebao Co., Ltd , https://www.carebao.com