The preparatory work before commissioning not only includes a series of preparatory work to shorten the commissioning time and prevent downtime, but also includes some other work. These seemingly have nothing to do with the preparation or debugging process, but they can improve the work of the printing operator. effectiveness. Planning and designing, preparing tools, preparing raw materials, cooperating, training and cleaning the ink supply system and wetting system in the workshop are the main contents and components of the preparation work.
First, the planning and design of the printing plant From the surface point of view, the printing plant planning and design seems to have nothing to do with the preparation, but reasonable planning and design will help reduce downtime and production efficiency.
1. Planning and Allocating Space When the printing shop is completed or rebuilt, it faces a new challenge - how to make overall planning and reasonable design for the workshop. According to the sequence of normal operations to determine the appropriate position of each operating station (including the printing press) in the workshop, and according to the size of the equipment, the required size of the working area and the amount of raw materials stored in the area How much, for each operating station to allocate modest space.
The size of the space occupied by the printing press depends on the type of printing press, the type of printing job, the transportation arrangement of the printing shop, the amount of paper stored around the printing press, and other factors.
2. The most important thing to consider when planning and designing the various tools to be used in the workshop is the convenience. Each press should have a whole set of special gadgets, instrument parts, and various raw and auxiliary materials that cannot be shared with other workstations. Although expensive items that are used only occasionally can be shared, some commonly used gadgets must be placed around. Operators should not go outside two or three stations at any time, no matter what the reason. Take the tools you need.
3, the planning of the bottom floor workshop and the design of the channel between the printing press must be wide enough to ensure that the forklift is free to enter and leave the paper from the storage room to the paper feeding section of the printing press, or to print the printed product from the collection The paper part is transported to the bookbinding shop or truck (if you are planning to outsource binding).
The space on the ground floor workshop is very valuable and must be used effectively. The planning and distribution of the ground floor should also take into account the need for access (including the truck's operating space) and the underlying load-bearing ratio (calculated in tons per square foot).
If a standard, single-size paper sheet is always used, the material handling equipment can be standardized and the floor space can be better utilized. Two other issues that need to be considered in the planning and design of the workshop are safety and the effective reuse of materials. Once the available storage space and access have been identified, these areas should be clearly and clearly marked with a high-quality, wear-resistant paint. The passageway should be wide enough to allow the truck to pass through, and the truck's operating range should also be limited to the passageway. Reasonable planning of passages and storage areas can greatly ease the burden of warehouse management.
Second, the preparation of the tool In the current printing process of the job should be ready for the next printing job tools and measuring instruments required, rather than wait until the next job to test the rush to collect tools. In general, during the printing process, the operator always has some idle time, which means that the operator does not need to stare at the printing press again. At this time, they can start to prepare the tools and materials needed for the next job. Therefore, it is possible to reduce downtime during the next job test.
All kinds of tools and measuring instruments needed during the trial run should be stored around the printing press and reachable when needed, instead of being searched and found all over the world. Here are some of the important tools needed:
1, large wrench - used to tighten / set blanket.
2, a set of multi-function wrench - used to adjust the press.
3, spiral micrometer - used to measure the thickness of pads, plates and blankets.
4, Magnifier - check the dot shape and structure.
5. Density meter - measures the density of the ink layer.
During the preparatory work, the thickness of the pad, plate, and blanket can be measured with a micrometer.
Third, raw materials
1. Material Management If the management of materials is poor, or if the supply links cannot keep up, there may be shortages of small items in the printing shop, either missing or missing, and each time leaving the printing press idle. Unfortunately, the operators did not find these things until the test run, so that an hour or even longer would be wasted. As a result, the schedule that had already been set up was disrupted and had to spend a lot of time. Time progress and make up for production tasks.
2. Paper paper processing also plays an important role in reducing the downtime of the press. Pre-adjusting the paper to the temperature and humidity conditions in the workshop is also part of the preparation.
Paper must be transported to the printing shop in advance and it should be adapted to the temperature and humidity in the workshop. When checking the performance of the paper, the press operator should not test large stacks of paper on the press. When multi-color printing or printing registration requires a relatively high job, the operator spends several hours debugging the printer, but the resulting overprint may be poor. In general, this phenomenon occurs when the paper passes through the printing press (printing the second color) for the second time, but it is too late to remedy the paper.
The moisture content of the paper can be tested with a sword-type paper stack moisture meter. Air-conditioning should be installed in the printing shop, and the relative humidity in the shop should be controlled. Prior to commissioning, the paper must be inspected and tested to see if the edges of the paper are the flounces and the pH of the surface coating. In addition, it should be checked that the edge of the mouth is straight, and the edges and rules of the mouth should be ensured. The sides are perpendicular to each other.
3, ink In order to save costs, reduce costs, some people often buy cheap ink, but if the use of cheap ink printing often fails, it may backfire, but a bit worth the candle. The ink strength is not enough, the ink supply must be increased and the thickness of the ink layer must be increased, but wetting and printing plates may have problems. Before testing, the ink should be tested and adjusted for color matching.
4, blanket, water roller and ink roller should always have spare blanket, water roller and ink roller (at least one set of spare ink roller). If necessary, the spare blanket should be pre-punched and the backup water roll should be flushed or replaced with a new water sleeve. In addition, the status of the water rollers on the press is also constantly monitored.
The treatment of the blanket has a great influence on the shutdown of the printing press. There should be a spare blanket, which should be used interchangeably. When the blanket is severely broken, it is better to replace a good blanket, which is faster and more convenient than repairing the blanket cylinder. Mild cracked blankets can generally be repaired, as long as the fiber surface of the blanket is immersed in water for hours or days. Every time the blanket is removed from the press, it must be wiped clean. Note that only the cleaning fluid recommended by the blanket manufacturer can be used to ensure that chemicals do not react with the blanket and extend the use of the blanket accordingly. life.
5, liner should be hard, smooth, with good water resistance liner paper, and cut according to the size of the printing plate. Different thickness liners should be stored separately, preferably each thickness liner is placed on a separate layer. Otherwise, during the test run, the printing operator would have to find the liner paper around the workshop to measure the thickness of the liner paper, and then cut the liner paper according to the size of the printing plate. At this time, the printing press was idle and lost. too big.
Soft liners should not be used because they contain a lot of air, which can cause the liner to over-compress, and it is not possible to accurately perform its function. Specially produced liners or polyester-like plastics can only be used as liners for the plate cylinders, and the liners for the blanket cylinders must also be dedicated liners.