(2) The FireStation digital controller and data server are the brains of the system, including FireWire high-speed connections. The system can process 400 million pixels per second. The digital controller transmits the data to the laser and has special electronics to maintain the imaging accuracy, accuracy, and consistency. The FireStation controller is capable of transferring ink ink zone data directly to the ink control system of the direct imaging press.
(3) The integrated motion system can place the laser at the right place at the right time.
At the exhibition, Presstek listed a long list of companies that use the company's DI technology and manufacturers' booths. In addition to imaging components, Presstek also introduced plates for computer-to-plate and plate imaging machines.
2. Adarst's 557 DI
In this exhibition, Presstek and Adast jointly launched a new type of direct imaging printer 557 DI. The direct imaging technology of this model is based on the Presstek ProFire imaging system and the innovative drum design of the internal storage plate, using the Presster's Prardldry Plus plate. At the time of change of plate, the plate material is output from the supply roll in the plate cylinder. At the same time, the plate of the previous job is involved in the take-up plate. This time takes only 20 seconds, and at the same time, 5 plates are imaged. Accurate printing.
557 DI has four-color and five-color models, format 381mm × 520mm, waterless offset printing, 12,000 printing per hour. There are 32 lasers on each machine on the machine. It takes only 4.4 minutes to complete imaging at 2540dpi resolution. 10 minutes of print preparation, including loading, loading, inking, imaging, changing plates, ink key settings, overprinting and color balance.
3. Heidelberg Speedmaster DI 46-4
This is a 34mm × 46mm format full-color color short-printing model. The printing unit is equipped with a unique plate cylinder, each with an integrated master box. Each box contains enough plate material for 35 prints. When printing plates are changed, the four color plates are simultaneously imaged and can be accurately positioned without the operator having to adjust them. Four imaging devices use a total of 16 laser diodes to image the plate. The laser beam etched the top layer to expose the ink-sensitive base layer, while the ink-repelling silicon surface remained intact in the non-printed areas. The imaging accuracy is 1270 dpi and the number of screen lines is 150 lpi. After imaging, the plate is ready for printing using an automatic cleaning system.
The machine is a satellite type, and a four-fold diameter central impression cylinder makes it possible to print four colors at a time, reducing paper stress and tension.
With a printing speed of 10,000 impressions/minute, a 500-print job (including print preparation time) can be completed in 20 minutes. This model fully utilizes the advantages of DI and is designed to change jobs frequently. Not only for short-lived, but also for 10,000 prints/hour, it is handy for long-lived.
4. Heidelberg Speedmaster 74DI
This is the DI model in the original Heidelberg Speedmaster press with the addition of an imaging device.
The Heidelberg AutoPlate plate processing system designed for DI is designed to automatically pull out and clamp the development-free thermal plate when imaging, and then simultaneously image all the printing units through the CP2000 touch screen.
The image forming equipment used by the Speedmaster 74 DI printing unit is equipped with a 40W laser and achieves 20 in. × 28 in with a resolution of 2400 dpi. The entire imaging time of the web does not exceed 3.5 minutes. The imaging process is performed on all printing units at the same time, overprinting is precise, and there is no need for any subsequent processing for the development of the plate.
The ink zone settings are automatically performed. The data of CIP3 is used to calculate the distribution of all color inks of the job and then transferred to the CP ink fountain for reservation. This helps to reduce the amount of wasted paper at start-up and therefore also reduces preparation time.
It is worth mentioning that the AutoPlate system, in addition to the functions of drawing and clamping thermal plates, also has the ability to remotely perform lateral, circumferential, and diagonal line registrations, plus programmable Clean the ink roller, blanket, and impression cylinder. Each plate change and automatic clamping time within 1 minute, and without the use of any tools for the operator, both accurate and avoid deformation caused by the clamping rod.
5. Man Roland's DICOweb
The manufacturer calls it the first real-computer offset printing system on the market. The first time it can be directly imaged, imaged, and reimaged on the press. It is fully automated, there is no film, no plate. Therefore, the DICOweb system has opened up a new path for short-run printing.
The technical specifications of this web printing press using DI technology are: output of 200,000 printings/hour (cutting length of 630 mm), printing speed of 3.5 m/s, variable cutting length, and web width of 520- 300mm. When the job is changed, the imaging operation takes only 2 minutes depending on the size of the web, and the time for the full plate change is about 10 minutes. The imaging operation is produced by a high-resolution laser of 3200 dpi or more.
The cost of production can be greatly reduced because it no longer requires expensive films and plates, and it is environmentally friendly. The image-removal scheme used is very effective from the environmental point of view. The used thermal conversion cassette can also be returned to Manchester Roland for recycling.
In-flight imaging is like enabling printers to combine the production and integration of sleeve technology for the first time. When changing the web, there are two methods: First, change the way of the printing plate and the sleeve like the wall thickness of the cylinder, the printing worker can easily change in the shortest possible time, change the printing length up to 200mm; the other The method is to change the entire drum and get a larger change.
From the standpoint of short-run printing costs, the design of this type of machine is not focused on the cost per sheet, but on the cost of the entire production process. They believe that quick and simple change of version is decisive for short-run printing, wide variety of printing, and high environmental protection. (To be continued)
Development Trend of Direct Plate Printing Press (Chinese)
December 15 06:07:31, 2023
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