Matters needing attention in the operation of packing tape printing machine → | World-Packing

In the long-term packing tape printing practice, we have summed up a bit of contribution and we hope to give you some inspiration. At the same time, if you have any good suggestions, we hope that everyone will not hesitate to enlighten them and work together to promote China’s packing tape printing technology!

The proportion of water. Use pure water, fountain solution 2-3%, alcohol with isopropyl alcohol 10-12%, and the temperature is set at about 10 degrees. (Slight changes according to workshop environment, etc.)

2.When the ink is newly added, first reset the ink fountain, turn the machine, and check the condition of the ink teeth.The new ink fountain film of Heidelberg generally has a larger amount of ink than the old ink fountain film. Komori, Mitsubishi and other ink teeth are as flat Pay attention to the inconsistent ink volume if it is not good.

Set the ink according to the printing plate. It is a special reminder to set the water volume as small as possible when setting the water volume, and then add the water a little bit when calibrating, so as to achieve the largest possible ink with the smallest watermark.
Put the bridge roller on the new ink to achieve the water-ink balance as soon as possible. Pay attention not to add the bridge roller when printing gold and silver ink, and try not to add fountain solution in the water. This can make the printing brighter.
When proofreading, be sure to check whether the surrounding corner lines are printed, whether the positions are correct, and draw the ruled lines. Always check the paper when printing.
The ink in the ink fountain should always maintain a certain amount, which helps to stabilize the color.
Wash the rubber frequently. Please pay attention to whether the rubber is injured when washing, to prevent the rubber from being damaged and affecting the integrity of the product. Observe whether the moisture on the layout is too large (small).
Powder spraying should be appropriate. In order to avoid affecting the quality and the back path such as laminating, etc., you can take the freshly printed paper and look at the powder spray from the top, look at the paper with a layer of powder.

Supplement the method of checking the amount of water in printing:

Observe the layout during normal printing. If the layout glows, it means that the moisture is too large. If it is matt, it means normal.
If you find that there is an ink line of about 1 mm in the bite of the plate during shutdown, it means that the water volume control is quite good.
If you notice occasional drops of water on the printed sheet when printing, if it is not condensed or leaking in the water nest, you should consider reducing water.
If water drops are found in the ink fountain during printing, the amount of water is too large.
The ink volume of the printed product is sufficient and the color is dull, which means that the amount of water is too large.

Pure water is soft water with a hardness of 0-7, so some additives are added to make the water’s hardness reach 8-12, which is more conducive to printing.

Usage of intermediate roller:

Close: Let the ink and ink balance quickly and stabilize the color;

Departure: gold, silver, large field, spot color, uv ink, fluorescent ink;

Concussion: eliminate ghosts;

The monitoring of the printer also includes the following four aspects: / Z

Plate surface temperature 25 ℃ ～ 27 ℃

Water tank temperature 10 ℃ ～ 12 ℃;

Water bucket temperature 15 ℃ ～ 17 ℃ ‘

Inking roller temperature 25 ℃ ～ 27 ℃

Talk about the experience of printing metal ink:

Due to the characteristics of its pigments, metal inks are easy to accumulate ink during printing and easy to fade after printing, so some methods should be adopted to avoid it during printing. At the same time, we must also print out the gloss of the metal. Using good methods can make the printed matter more Metallic.

First of all, metal ink has higher requirements for water. Generally, do not add fountain solution in the water tank. It has a certain reaction to acidity and it is easy to blacken. Therefore, the fountain solution cannot be added when the water is mixed. Sometimes it is printed with four-color ink. Then add as little as possible. Alcohol can be added slightly. In order to protect the printing plate in the water tank, you can add some protective plate offset printing. After the metal ink is long, it is best to change the water. Generally, a layer of gold oil will float in the water tank.

Some additives can be added to the metal ink. Such as varnish, red and yellow ink. White ink or black ink is added to the silver ink. We often find that the metal ink is often not printed correctly. Adding additives to the ink can increase its coverage rate, and Varnish, etc. can make the metal ink have stronger adhesion after printing, and it is not easy to fade. According to different printing requirements, we can use different additives. The additives have a certain amount of resistance to the sense of metal to pay attention to. Sometimes we can hit the fake bottom first and then Metal ink is printed on the bottom, such as first printing yellow ink on one side and then printing gold, etc., which can make the gold seal thicker.

In order to make the metal ink thicker, two gold plates can be used, so that it is not easy to pile ink without setting the ink too large.

The general pressure of printing metal ink is slightly higher. The multi-color machine printing gold group will have different effects. The metal feeling in the last group will be stronger. The front will be thicker, but the color will be slightly darker.

The function of the water stick of an alcohol car is very important. If it is done well, it can be used with half the effort, otherwise it will cause much trouble. The water stick of the alcohol car includes a water bucket stick, a measuring stick, a version water stick, and a string water stick. The measuring stick and the water transfer stick are metal sticks, which are non-adjustable parts, but their surfaces must be kept clean, and no ink skin or other impurities should be attached to the surface, and there must be no bruising, otherwise the water transfer effect will be affected. . The water bucket stick is responsible for transferring the water in the sink to the measuring stick. It plays a great role in the process of water transfer. Its quality directly affects the quality of the water transfer. When adjusting the pressure, click on the water addition button to make it appear on both sides of the metering stick. It should be 2-3 mm. It must be the same on both sides, that is, the pressure is even. Their pressure must not be too large, otherwise it will affect the life of the water bucket. The water bucket stick should be diligently maintained and wiped with car wash water to keep the surface clean. For example, there was a printing job, and a vertical watermark appeared intermittently on the job, but sometimes it didn’t. After inspection, it turned out that it was caused by a small piece of ink on the water bucket stick. It was normal after washing it off. The water bucket stick and the metering stick are driven by the water bucket motor. They should be diligent in filling grease between the gears to keep the transmission flexible and extend the service life. The pressure of the water stick and the water stick should be moderate, otherwise the water bar will easily appear.

In short, in the production, it should be debugged according to the standard of the printing machine. It cannot be temporarily made up. For example, the water glue is worn, and it can be printed by the debugging pressure. Minor illnesses become serious illnesses and are taboos in production.

Share the method of adjusting the pressure of Heidelberg water bucket roller and metering roller: f;

The good adjustment of the pressure between the water bucket roller and the metering roller allows the water to be evenly distributed to the layout, which is the basis for controlling the water. There is a method to quickly and accurately adjust them.

Wash the water bucket roller first, and wipe it with water roller cleaning agent. The metering roller must be protected, and it must not be injured. After installing them, relax their pressure and continue to turn the water bucket roller on the water bucket roller. See a layer of water marks. Keep both sides with a ten centimeter mark, and then turn the adjustment screw counterclockwise 180 degrees. The two sides are the same, at this time we can see that the water marks have been received by the bucket roller. It will be thin and even.

Shenzhen World Packing Industrial Ltd

Stretch Film & Packing Tape Specialist