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At the same time, in order to tap the potential of reducing paper waste in commercial web offset printing, extensive testing has also been conducted.
In thermosetting web offset printing, paper is wasted by many different factors, so reducing waste has become a complex matter involving many variables. Only through the interaction between various measures can we achieve the goal of reducing costs by reducing paper waste.
In thermosetting web offset printing, tests focus on the conditions that may be optimized at the time of startup, acceleration, and production. Moreover, the measures taken to reduce paper waste at a certain stage are also beneficial to other phases.
Extensive testing
Only through extensive testing can we successfully achieve the effect of reducing paper waste. Through these tests, the cause of waste and the inherent wasteful factors can be systematically determined. The method of reducing paper waste developed through these test results must be tested by a large number of actual tests.
Here, the important tools are highly developed measurement and control technologies. Without these, it is virtually impossible to make progress.
This article describes methods and systems developed by Manroland to reduce paper waste, some of which were obtained in collaboration with customers and external partners.
Different expectations for quality
In the field of thermosetting web offset printing, the expectation of quality depends on the purpose of the product and there are different levels of acceptable quality. In this way, it is difficult to give a concrete description by reducing the degree of paper waste that can be achieved by the tests described below.
Reduce paper waste
As already mentioned, the following data can be roughly estimated: In the process of preparation and speedup of printing, there are generally 2,000 to 300 parts of waste, but if the method described in this paper is used, paper waste can be reduced to 1000. About. For the highest quality expectations (first-grade quality paper), 1000 wasted, newspapers achieved salesability in print color and folding registration, and the field density has reached the standard value, and the fluctuation range of the density can be minimized. Reach +/- 0.08.
These test methods have particularly positive results for those expensive and high-quality materials. Under normal circumstances, the waste of paper that is expected in printing will reach 10,000, and it will take a long time to adjust. Paper waste can be greatly improved when using the color adjustment system described in this article.
Paper waste when adjusting
In addition to special inking methods, some other accompanying methods are also very helpful in reducing paper waste. This included the use of a rapid dryer, which had a speed of 5000rph instead of 8000rph. This was done in cooperation with the dryer manufacturer Megtec. In addition, the improvement of the engine is also very helpful. The roll force system is now set at 3000rph instead of 5000rph.
Stable boot status
In order to achieve a stable start-up state, the inking device is thoroughly cleaned, and the blanket is also cleaned. This ensures that printing always has the same preset parameters.
Set a low percentage of outlets
If printing a low dot percentage, for example 10%, it takes a long time for the inking system to balance and the ink flow to a reasonable setting.
The new inking system solves this problem. Before the printing press started printing, each ink inking unit had already applied a certain amount of ink. Since the ink metering element can be preset by using the data obtained from the Production Manager Production Manager, the ink flow can be matched.
If the dot percentage is ignored, the new inking system uses only about 100 parts of waste and the printer's ink flow can reach an appropriate state.
Register line is working quickly
This inking system is particularly advantageous for color and folding register, and control and color adjustment are only started when the measuring head detects the correctly printed register line. Since the register line is generally placed at a low dot percentage and is not inked, it can be rotated 1,500 times, for example, the number of wasted pieces before the first correct measurement is obtained.
Fully automated sorting
Prior to inking, remove any residue from the inking device or clean the inking device. All of these tasks are performed automatically according to pre-set steps in the manroland provided program. This ensures that there is a best The startup sequence.
Reduce paper waste in an accelerated state
During the acceleration phase, the ROTOMAN will continue for about 70 seconds before it is accelerated to 65,000 rpm. Due to the slow adjustment, the system cannot completely adjust all the components in a short time.
Reduce paper waste during the acceleration phase
Previously, ROTOMAN was speeded up to 65,000 rpm during the acceleration phase, which lasted about 70 seconds. Due to the slow adjustment, the system cannot completely adjust all the coefficients in a short time. This has an effect on the inking device in particular, since the ink cannot be transferred fast enough by the ink roller to cause the problem of ink desalination. This leads to waste in an accelerated situation.
The Solid Wood Dressing Table is natural and simple, environmentally friendly and healthy. The solid wood dresser has been carefully carved by skilled craftsmen, highlighting the style and elegance, which is a combination of nature and beauty.
The main feature of the Solid Wood Dressing Table is that it is natural and environmentally friendly, mainly because it uses a small amount of glue in the processing and production process, and the pure solid wood dresser is made of natural wood, which has the advantage of environmental protection.
The Solid Wood Dressing Table also has a value-preserving function, because its wood is precious and the price has room for rising, so it has a value-preserving function. And the pure solid wood dresser has natural texture, beautiful pattern, very good decorative effect and long service life.
The Solid Wood Dressing Table is made of natural wood, which has a more natural appearance, is strong and durable, and is green and environmentally friendly.
The waste of paper in printing is unavoidable, but there are ways to minimize it. In order to meet customer requirements, Manroland has paid close attention to the possibility of a total reduction in paper waste. In other words, we must carefully examine the factors that cause paper waste. This can only be achieved with industrial partners such as desiccant manufacturers or paper and ink suppliers. The strength of these development engineers working collaboratively with colleagues in different areas and product areas has also played an important role. For example, the technical know-how of operating a sheet-fed press was used in an optimised design project by Manroland in collaboration with Eurografica-Systempl a-nungs at Imprimere Saint-Paul in Luxembourg. Here, in the newspaper printing environment, measures to reduce the paper waste rate were used very successfully. The waste at the time of starting up was reduced by 80%, and the cost saved by production and related projects was repaid many times.