The best single sheet of paper UV printing
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Best Practices
High production quality and high throughput require the entire process to be an integrated production system, which includes optimizing the use of all consumables, continually adjusting prepress, system maintenance, proper equipment adjustment and optimal operation.
Best practices begin with understanding and adhering to safety, health and environmental compliance regulations.
Safety, health and environmental protection
Best practices begin with understanding and adhering to safety, health and environmental compliance regulations. Some basic suggestions are selected below. However, local regulations and regulations should also be taken seriously. In Europe, organizations such as the British Health and Safety Administration (HSE), the French National Health Insurance Agency (CNAMTS) and the German Accident Prevention Department (BGDP) continue to introduce public bills, and regional bills are increasing.
Safety Precautions:
‧ Detailed information on the Material Safety Data Sheet provided by the consumable supplier. Always use this data when using these products.
‧ Observe the safety, handling and maintenance procedures recommended by the equipment supplier.
‧ Energy-curing products are irritating to the eyes; wear protective eyewear when arranging.
‧ Do not look directly at UV radiation or enter the radiation area.
‧ Do not mix cleaning cloths for traditional inks and UV inks in the same container. This can lead to cross-contamination and complicate waste disposal.
Handling of materials: Energy-curing products can be treated like oil-based inks and water-based products, as well as the same high standards of hygiene and work practices.
Health: Wear suitable protective gloves when cleaning, especially when using solvent-based cleaners. The contaminated rag should be taken away and reused after proper washing.
Spilling and cleaning: Spilled water should be cleaned immediately, as energy-cured products will not dry out; if spilled, they can easily spread out in the workplace, creating safety problems.
First aid: When accidentally coming into contact with the skin, the skin should be thoroughly washed with soap and water. Do not use solvent-based cleaners to cleanse the skin (they remove natural protective oils, which increases the amount of energy-cured products absorbed by the skin).
Environment: Energy curing has been designated as the best available control technology to reduce solvent volatilization into the air.
Disposal of wet inks and varnish: All inks are classified as "controllable waste". Energy-cured products are considered hazardous waste because they contain substances that are irritating to the skin and eyes; some ingredients are also harmful to the environment. However, energy-cured products are not considered to be corrosive, explosive, flammable, or toxic to human health, so they can enter landfills as specified in local regulations. The best way to handle wet energy-cured products is controlled incineration.
Recycling: Wastes printed with UV ink can be recycled using existing technology.
working environment
For best results, the pressroom should have a temperature of 20 – 30 ° C and a relative humidity of 50 – 60%. The environment should be as dust-free and airless as possible. If these conditions are not maintained, production and quality performance will decrease.
Major maintenance issues (unlike the maintenance of traditional offset printing)
Maintenance of the wetting device: Since the ink-ink balance of the UV ink is highly sensitive, it is a basic requirement to thoroughly maintain the wetting system. FOGRA recommends using a specified test plate on the press to control and adjust the wetting device.
Cleaning: To ensure high quality and stable quality during glazing conversion, hygiene is critical. When converting from conventional inks to UV inks, the press must be thoroughly cleaned and vice versa. Because the chemical composition of these ink systems is different.
Ink mist: The rapid rotation of the ink roller causes the ink of high viscosity to produce ink mist. The ink mist must be discharged because it is harmful to the human body and can contaminate the inking unit. When exposed to ultraviolet light (or in the sun for a long time), the ink will solidify and be difficult to remove. The resulting ink mist can be reduced to an absolutely minimum level by reducing the amount of wetting fluid. Special equipment can be installed on the press to remove the mist by suction. This is a highly recommended measure to extend the life of high speed UV printing.
Ink roller setting: When mixing conventional inks with UV inks, it is necessary to monitor them more frequently because of the risk of expansion of the ink rollers.
‧ The resilience of the UV-printed rollers and plates should be set to a minimum to avoid the appearance of dirty tracks.
‧ The ink roller for UV printing should be set 20 to 25% smaller than the ink roller for conventional ink.
Drying unit: Good curing quality, productivity and lamp life depend on system maintenance, cleaning and temperature stability.
‧ Regularly check whether the water pipe is limited by scale accumulation. Clean the air filter regularly to ensure airflow and ensure the cooling efficiency.
‧ Clean the drying unit regularly.
‧ Clean the fixture and reflector with a soft cloth dampened with alcohol. Do not touch the quartz tube with bare hands, because traces of sweat or dirt will be baked on the lamp, reducing the efficiency of the lamp and shortening its service life.
‧ Regularly test the status of the luminaire (eg GreenDetex method tested with UV-sensitive tape).
‧ Replace the UV luminaire as needed, with a normal service life of 1,000 to 1,500 hours, depending on the mixing of the job and the cleaning of the luminaire.
‧ The time required to replace the luminaire is less than 5 minutes per module - until the luminaire has cooled down, the machine panel can be removed and replaced.
‧ The time to replace the reflector is usually between 5,000 and 10,000 operating hours, depending on how clean the reflector is.
Lubrication: Use only heat-resistant grease.
Wetting device maintenance
Daily maintenance:
‧ Check temperature, conductivity, pH and alcohol content.
Weekly maintenance:
‧ Clean the dampening fluid container and water bucket to make it the best private hydrophilicity.
‧ drain system buckets, pipes and containers. Refill with hot water.
‧ Add the prepared water bucket system cleaner and pump it into the water bucket for circulation.
• Let the cleaner flow through the system until you see only the discoloration of the solution, no longer there are large particles left.
‧When the system is cleaned, drained, rinsed with water, drained, wipe the water bucket and container clean.
• Replace all filters and refill with dampening fluid.
• Clean all water rolls and corrode the chrome roll before the dampening fluid is pumped into the water hopper.
‧ Degrease the surface of the roller with a cleaning agent and corrode rubber, chrome and ceramic rolls.
‧ Check the system for microbial growth.
Update the wetting fluid:
‧ Alcohol-free solutions are checked every 2 weeks.
• A solution with isopropyl alcohol is checked every 4 weeks.
Annual maintenance:
‧ Drain the wetting system and remove all filters.
‧ Fill the container thoroughly with a cleaning solution to ensure a smooth cycle.
‧ Cycle for two or three hours. (Turn off the air-conditioning unit and circulate it with warm water when cleaning.)
‧ Drain the container and rinse it with water for at least 10 minutes.
‧ Re-empt the container and rinse with water and 2.5% dampening fluid additive.
‧ Empty the container. Refill with dampening fluid and prepare for use.