Imagesetter Selection Guide
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Winch and drum imagesetter selection Five years ago Ask the dealer or prepress expert how to choose an imagesetter: drum type or winch type? He is likely to tell you: If you are pursuing high speed and easy operation, and printing ink white or monochrome, two-color printing, should winch type; if you want to produce three-color, four-color or five-color high-quality printing, obviously should Optional drum type. Although most experts still have the same recommendations today, some believe that the technical level of winch has greatly improved, and the price of drum systems has also declined. The difference between the two is no longer obvious. The difference between the two previous technologies lies mainly in quality and speed: the winch speed is fast and the drum quality is good. Now, the technical improvement of the winch and the reduction of the drum price, the speed increase, greatly narrowed the difference between the two. However, each phototypesetter still has its own advantages and disadvantages.
1. Purchase trend
According to the survey results of the relevant departments, over three-quarters of the photosetters in the past were winch-type, and the recent purchase trend has clearly shifted to the drum type.
2. working principle
In simple terms, the turret imagesetter functions as an audio or video cartridge recorder. The film is spread flat on a flat glass platen and imaged by a laser. The roller technology, on the other hand, mounts the film on the surface of the roller and the laser moves to image the surface of the film.
3. Comparison of advantages and disadvantages
The advantage of the winch type is that in addition to the lower price, there are three major advantages of high speed, flexibility, and ease of operation.
The winch type uses roller conveyor technology, so there is no limit to the length of the imaging film, and roller type equipment has limitations on the length and width of the film. This allows the user of the winches-type imagesetter to perform photo-taking of over-size films. Winch-type imagesetters only need to adjust the size of the film on the roller to print images from large stamps to huge images, while drum photosetters only allow photographs with large or smaller film sizes. And sometimes there is a minimum size limit, which makes the printing of small prints inefficient and wasteful. In addition, the winch type does not require a relatively long loading and unloading time for the drum type, thereby making the operation faster and easier. Although drum-type equipment is a recognized standard of high-quality film output, many winch-type equipment vendors still believe that winch-type equipment is comparable to the drum type. When people compare products produced by two types of equipment, they find it impossible to tell which equipment they are producing. If you want to print on a 300 lpi screen, roller equipment has advantages, but for general operations, the quality of the two devices is indistinguishable.
The advantages of the drum type Compared with the drum type equipment, the design of the roller conveyor technology of the winch type equipment makes it very flexible, but this is also the main reason why it has disadvantages in quality and positioning registration. Winch-type equipment uses a roller and tension guide to flatten the film on a glass plate. When the film moves, it is easy to deviate from the trajectory, sometimes there is stretching. When the film is too fast or too slow, there often occurs points of different degrees of tension on the film, which may cause the image dots to expand or contract. Roller equipment will not have similar problems. The winch-type device does not duplicate the film edge dots as a drum device because the most accurate imaging point of the winch device is at the center of the film and the laser can be imaged at a 90 degree angle. Forty-five degree angle scans are used on the film edges, resulting in elongated dots. With the roller technology, the film does not move and the laser moves on the film surface, so each dot is exactly exposed at a 90-degree angle.
The choice of photocopying system The choice of photosetting system is very important. There are several factors to consider when choosing a new system.
Format and quality are the first issues to consider. That is, first determine whether the output size and film quality of the selected machine meet their own needs. In addition to the size of the image, accuracy and repeatability should also be considered. After screening, uniform rose-shaped dot structures should be generated, and moiré patterns cannot be generated. These dot structures will deliver fine image details and a wide range of gradation to produce high-quality images. A high-performance photo-setter should be able to output high-quality film at a lower resolution, so that the imagesetter can operate at high speed to achieve maximum throughput. If special requirements, such as flexography or screen printing, are required, the standard screen angle needs to be changed by 7.5° to meet these needs. Imagesetter linearization is also very important, allowing the operator to easily control the density and linearity of the output film - so that the dot density output to the film is the ideal density.
The productivity of an image-setter is determined by a series of factors. When considering a decision, the highest load should be considered, not just based on general needs. Only at full load, the actual imaging speed of the imagesetter and the balance between speed and system performance are the most important. The reliability of the system must be transmitted in a proven and validated technology to ensure consistent output for every production. Remote diagnosis minimizes the downtime caused by a fault and accelerates the necessary processes accordingly. Easy-to-use features should include an intuitive interface that allows for flexible operation, which greatly increases employee productivity.
Flexibility and extensible sex refer to the flexible and open device structure used. This structure depends on industry standards rather than the unique technology used by the device. Software RIP based on the True Adobe Postsuipt3 industry standard will make your investment worthwhile - because it simply changes the existing computer into a new model to upgrade the RIP to meet the needs of high-performance devices. If you do not combine the actual, then the indicator on the specification is just a bunch of meaningless numbers. Therefore, considering the parameters of the imagesetter, it must be combined with specific quality standards and deadlines. Only in this way can the corresponding parameters be meaningful. For example, some imagesetters claim to run fast, but in addition to considering the basic imaging speed of the imagesetter, the uploading and downloading time of the film is very long, which will inevitably affect the overall operating speed, resulting in a decrease in production volume. How repeatability is also an important indicator, but it does not make sense to consider the indicator from a single point of view, because environmental factors such as temperature and humidity will have a great impact on output quality. Also don't think big is good.
A large format photo machine is not a good machine. You should choose a system that fits your company's business size. In short, the most prudent approach is to use actual jobs to perform tests on a series of machines that are to be purchased. Only then can we truly see how the jobs are produced. Therefore, buyers and sellers can reach a certain degree of consensus.