In the offset printing process, particularly in monochrome printing presses, whether printing in four colors (Y, M, C, BK) or for trademarks, packaging, and decorative elements, it is common to wash ink and change colors. This involves cleaning the entire inking system of the press and replacing the old ink with new ink. The ink washing device typically includes a rubber blade, an ink collection tray, and an adjustable screw that ensures proper contact pressure.
The ink washing procedure begins by pouring gasoline or car wash water onto the ink rollers. The wiper is then installed into the ink washing slot, and the adjustment screw is tightened so that the rubber blade makes contact with the ink roller surface at a 40-degree angle. As the tandem roller moves back and forth, the rubber blade scrapes off the old ink and solvent, collecting it in the ink tray. This thorough cleaning helps ensure accurate color reproduction.
Proper ink washing and color change are essential for achieving precise and vibrant print colors. Without effective cleaning, the ink may not adhere correctly, leading to inaccurate hues. To achieve optimal results during the ink washing and color-changing process, several important considerations should be taken into account:
1. The ink scraper must be properly installed on the press when changing ink or cleaning the ink rollers. The eccentric pins of the ink tray should be placed into the groove on the support shaft, while the adjusting nut is secured into the square iron block. Once installed, start the machine and adjust the nut so that the rubber blade gently touches the ink roller surface. Ensure even pressure on both sides to guarantee full contact and complete ink removal.
2. When cleaning the ink, pour gasoline from above the ink fountain area onto the ink roller. This allows the waste ink to flow down along the edge of the rubber blade and into the ink tray. After some time, the ink roller will be thoroughly cleaned.
3. After cleaning the ink fountains and rollers, wipe them with a soft, lint-free cloth that has good absorbency to avoid leaving behind fibers or debris.
4. The position of the wiper should be accurately set so that the rubber blade maintains equal distance and consistent pressure across the ink roller surface.
5. After cleaning, wipe the surface firmly and quickly, ensuring that no cloth gets caught in the moving parts of the press during operation.
6. When pouring gasoline, operators should maintain a controlled amount to prevent spills and unnecessary exposure.
7. Smoking and open flames are strictly prohibited in the workshop to prevent fire hazards during the ink-washing process.
8. Safety is crucial during the operation of the press. Operators must be cautious of their clothing, especially sleeves and buttons, to avoid getting caught in the rollers. It is also important to avoid carrying sharp objects like keys, pens, or tools in pockets, as they could fall into the machinery and cause damage or injury.
9. There are two main scenarios when changing ink: switching from light to dark ink or from dark to light ink.
- **Changing Light Ink to Dark Ink**: This process is generally easier and requires less cleaning. Simply remove the light-colored ink from the ink fountain using an ink shovel, and use the wiper to clean the remaining ink from the rollers. Be sure to remove any residue such as ink skins or paper particles.
- **Changing Dark Ink to Light Ink**: This is more challenging and requires a higher level of cleaning. If old dark ink remains on the rollers, it can contaminate the new light ink, causing dark shadows or color inaccuracies. Therefore, the ink fountain, rollers, and tools must be fully cleaned. Apply the light ink to the roller, start the press, and evenly distribute the ink before rinsing with gasoline. Repeat if necessary until the roller is completely clean.
By following these steps, printers can ensure a smooth and efficient ink-washing and color-changing process, resulting in high-quality prints with accurate color representation.
Wooden Door
NINGBO GREENLY INDUSTRY CO.,LTD. is one of the leading manufacturer and exporter in Ningbo of Zhejiang Province, specializing in producing and supplying Wooden Furniture , Wooden Table And Chair Set , Wooden Doors,Multifunctional Wood Furniture to the countries all over the world. We are looking forward to establish long-term and beneficial business relationship with customers worldwide.
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Construction: Wooden doors are typically constructed with a solid wood core or a framework filled with a solid wood panel or veneer. The wood used can be hardwood, such as oak or mahogany, or softwood, like pine.
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Design and Styles: Wooden doors come in a wide range of designs, including panel doors, flush doors, glass-panel doors, French doors, and more. They can have different patterns, textures, carvings, or raised panels, depending on the desired aesthetic.
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Durability: The durability of a wooden door depends on the type and quality of wood used. Hardwood doors are generally more durable and resistant to wear and tear than softwood doors. Proper sealing, finishing, and maintenance can also enhance the door's lifespan.
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Insulation and Soundproofing: Wooden doors provide natural insulation, helping to maintain indoor temperature and reduce energy loss. They also offer better soundproofing compared to some other door materials.
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Finishes and Treatments: Wooden doors can be finished with various treatments, including painting, staining, varnishing, or sealing. These finishes enhance the appearance, protect the wood from moisture and damage, and increase longevity.
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Maintenance: Wooden doors require regular maintenance to keep them in good condition. This may involve cleaning, polishing, and periodically refinishing the surface. It's important to protect them from excessive moisture, direct sunlight, and temperature fluctuations to prevent warping or other damage.
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Ningbo Greenly Industy Co.,LTD. , https://www.chinagreenly.com