Napkin flexo printing

The progress of flexographic printing water-based ink technology has made the color of napkin prints more colorful, and it has also laid the foundation for flexographic printing plants to enter the napkin printing market. In southern China and the coastal areas of Jiangsu and Zhejiang, napkin flexo printing has become a new investment hotspot. We are concerned -

Napkin printing is very promising

now. In many places in life, eyes always jump out of those colorful napkins. As long as you visit some big restaurants, you will find that the napkin printing market has great potential. These hotels are aware of the importance of publicity on napkins. Pay attention to the printed information on the napkin. You will find content including nutrition instructions and company celebrations.

Of course, you will also find a new consumer style consumer who wants napkins to be part of the beautification of home life and wants to show more brushes in the kitchen. Spider-man napkins, won the 2o05 United States F Ding ^ flexo printing quality evaluation The color of the full award, of course, they also hope that the napkin used in the banquet can add more fun to the party.

Looking at the best-selling napkins in the supermarket, there is an interesting phenomenon. The more colorful the napkins are printed. The more you sell napkins. Some napkin manufacturers have tasted the sweetness of flexo printing technology, the napkins they produce. Its brightly printed colors, full of visual impact on the shelves, stimulated the desire of consumers to buy, sales rose all the way.

Flexo printing onto the napkin printing stage

Napkin printing is initially printed using oil-based inks, which are characterized by a good fit on the machine, but the smell of printed products is particularly large. Some napkin printing companies that use letterpress technology. Try using a glycol ink (washable) to print napkins. To eliminate the odor of printed products. However, this process has encountered some difficulties. For example, when a printed product encounters ethylene glycol, ink crepe paper appears. In addition. The ink's on-board adaptability is not ideal.

Some visionary printing companies are aware. To solve customer complaints paper napkins smell odor is the use of flexographic printing aqueous ink. The odor resulting from the oxidation of grease type ink does not appear on the body of the flexographic printing aqueous ink. Therefore, the flexographic printing aqueous ink has no residual odor.

The expansion of the napkin market reflects the changes in the napkin printing process over the past 10 years. Ink technology has made great progress. Napkin printing companies (previously using embossed grease inks) have turned to more suitable flexographic printing water-based inks. At the same time, napkin printing companies have also felt that pigment inks outperform dye-based inks. .

under such circumstances. Flexo printing technology has entered the stage of napkin printing.

1. Reduces ink pick-up

The composition of a flexographic printing water-based ink contains a resin that hardens when dried, and a wax. After the pigment displaces the dye. Minimize ink crepe paper. We may wish to do an experiment. Increase your sense of sensitivity to ink crepe paper. If you put a piece of damp glass on dye-dyed paper. You will notice ink pick-up on the paper. On pigmented paper. There will be no color penetration into other areas. In a system with high pH (typical household cleaners belong to such a system), if the ink is improperly selected, napkins are prone to ink pick-up.

2. Environmental protection

Because waste inks (including water-based and solvent-based inks) can recover pigments. Therefore, the flexographic printing water-based ink is more environmentally friendly. Because no VOCs are produced, flexographic printing aqueous inks meet the environmental requirements for reducing VOC emissions.

3. Improve corporate profits

Reduced price pressures and reduced ink inventories are very helpful to the business operations.

4. Other advantages

The odor is smaller and it has good chemical and abrasion resistance.

1. The most critical ink

(1) Type of ink

There are two types of inks available for napkin printers. One is finished ink and the other is concentrated ink. Finished inks can only be printed on a limited number of substrates. The concentrated ink can be printed on a variety of substrates. But add some additives. The use of concentrated inks is convenient and can be applied to a variety of printers and anilox rollers, which is important because a lot of different types of machines are often used. For example, to obtain a standard color, a printer may need to add 120% water, while another machine may only need to add 70% water to achieve the same color effect. In this case, the use of concentrated ink is very flexible.

It is a good choice if you plan to mix ink-concentrated ink yourself in the workshop. Not only can they quickly meet customer requirements, but they can also reduce ink inventory.

(2) Ink is to be used for end-use

If you are considering entering the napkin printing market, the most important thing is to understand the relationship between ink and ink and napkin prints. Regardless of the type of napkin material on which it is printed, it is important to understand that the color of the napkin print has limitations.

Napkin printing companies will encounter the problem of ink crepe paper. After the napkin is stained with a drink, the ink on the napkin will smear dirty white table cloths or clothes, which will incur consumer complaints. Therefore, we must have such common sense: the limitations of pigment knowledge and color. For example, know that some pigments are not suitable for printing on napkins. For example, rose red, methyl violet, basic blue, red C precipitation pigments, etc., because these pigments and certain compounds (such as water and ethanol, etc.) will affect the ink resistance.

In order to avoid the emergence of resistance problems after napkin printing, the printing company should also understand the end use occasions of napkins in order to understand what materials the napkins will come into contact with in the terminal application process. The best way is to use a method to detect the abrasion resistance and chemical resistance of napkins. Testing is to be standardized, and the test results are suitable for a variety of possible end applications. For example, it must be taken into account that napkin printing inks have a high alkali resistance and are also resistant to milk, water, and alcohol. The detection method developed by the company should be reproducible to eliminate the influence of operator's subjective factors on the test results.

Second, consider the safety of napkins that contact the skin and eyes during use. It is also necessary for printing companies to be familiar with the following terms. For example, occasional food contact with indirect food contact and direct food contact, and proper selection of inks that have passed the direct food contact certification. When printing companies take full account of these factors, they will limit the choice of color for napkin printing inks. In particular, many colorful colors cannot be reproduced on napkins. These limitations also increase the cost of ink.

(3) Strict selection of ink suppliers

It is required that the ink should maintain sufficient printability on the machine before cleaning the printing plate, which is closely related to the substrate. Ink manufacturers are required to standardize their colors, use certified proofing methods, and the printing materials used in proofing are consistent with the printing materials used in printing.

(4) Ink laboratory analysis

Napkin printing is faster, in order to ensure high-quality printing at high-speed printing, ink suppliers should simulate the properties of the press in the laboratory, analyzing agitation shear, ink release and other on-board suitability.

Purchased inks are subject to testing and certification, including color, viscosity, pH, foam resistance, and chemical resistance.

(5) The use of ink to achieve standardization

Obtaining knowledge from the ink supplier tells the machine operator the importance of standardized operation. Record the viscosity, pH, and other characteristics of the ink in a documented manner. Education machine operators develop the habit of recording ink information, which is the correct way of operation required by the process.

Use a color spectrophotometer to ensure that a reliable product is printed.

Remember that the ink supplier's opinion is an important part of napkin printing.

2. Necessary testing tools and tools

The following detection methods and tools can greatly improve the quality of napkin prints.

(1) Characteristics of the flexographic printing press: The prepress workshop provided test printing on the printing machine to measure the dot gain characteristics of the flexographic printing press. This process is called the characterization of the printing press. Its purpose is to use a 4-color ink to print a color image to obtain dot gain characteristics of a flexographic printing press, so that the dot gain caused by the machine performance can be compensated at the time of plate making.

(2) Anilox roll test: The goal of flexographic printing is to print the desired color with the thinnest possible ink layer. Testing the anilox roll characteristics on a flexographic printing press can help achieve this goal. A well-known brand of anilox roller has a variety of anilox rollers with different depth and number of engraving lines. The result of the anilox roll test helps the ink manufacturer optimize the composition of the ink in order to adapt to the printing requirements and reduce the tuning time in the printing process.

(3) Auto-flushing of printing plates: Adjusting the printing color is one of the main reasons for printing downtime. For a shop that frequently cleans printing plates, a printing plate auto-cleaning system can greatly reduce printing downtime, especially fine line printing. And 4-color overprint better reflect the value of printing plate automatic cleaning system.

Reprinted from: Book Industry Forum