The advantages of napkin flexo printing
1. Reduces ink pick-up
The composition of the flexographic printing water-based ink contains a resin that hardens when dried and a wax. After the pigment displaces the dye, the ink crepe paper is minimized. We may wish to do an experiment to increase your perceptual knowledge of ink crepe paper. If you put a damp piece of glass on a piece of dye-dyed paper, you will notice ink pick-up on the paper. On pigment-stained paper, no color penetration into other areas occurs. In high-pH systems (typical household cleaners are such systems), napkins are prone to ink defects if the ink is not used properly.
2. Environmental protection
Because waste inks (including aqueous inks and solvent-based inks) can recover pigments, flexographic printing water-based inks are 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.
The essentials of napkin printing success
1. The most critical ink
(1) Type of ink
There are two types of inks available for napkin printing companies. One is finished ink and the other is concentrated ink. Finished inks can only be printed on a limited number of substrates, while concentrated inks can be printed on a variety of substrates, but some additives are added. 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, one press may need to add 12% water, while the other machine may only need to add 70:6 water to achieve the same color effect. In this case, the use of concentrated ink is very flexible.
If you plan to mix your own ink on the shop floor, concentrated inks are a good choice. Not only can they quickly meet customer requirements, they can also reduce ink inventory.
(2) Ink meets the end use If you are considering entering the napkin printing market, the most important thing is to understand the relationship between the ink and the ink and napkin crystal. 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, such as rose red, methyl violet, basic blue, red C precipitated pigments, etc., because these pigments affect the ink after contact with certain compounds (such as water and ethanol, etc.) 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 printers to be familiar with the following terms, such as occasional food contact, indirect food contact, and direct food contact, and the correct choice of inks that have passed direct food contact certification. When the printing manufacturer fully considers the above factors, it will limit the choice of color types for napkin printing inks, especially many colorful colors cannot be reproduced on napkins, and these limitations also increase the cost of the ink.
(to be continued)