Gravure printing ink classification and application

Gravure printing ink, according to different printing substrates, is divided into plastic gravure ink, paper gravure ink, aluminum foil concave ink and so on. In the following, the application technologies and printing technologies of packaging materials such as printing inks are mainly introduced.

First, the classification of plastic gravure ink and printing common sense

Plastic gravure printing inks are mainly divided into two categories: printing inks and composite inks (composite inks are also called printing inks).

In addition to printing, there are many post-processing steps in the manufacture of plastic flexible packaging, so be sure to pay attention to the relatedness of each process. No matter if it is a surface printing or compound ink, the appearance index such as the color, adhesion, and dryness of the ink product must be checked before printing. If it meets the printing requirements, if it does not meet the requirements, the printing should be stopped immediately, and the reason for the problem should be analyzed. , is the wrong color to carry out recovery, do not detect when printing, to print only after the discovery of the product does not work, leading to unnecessary losses, which is necessary to pay attention when printing.

1. The main application knowledge of plastic printing ink

Plastic surface printing inks are generally produced with polyamide as the main resin, and are mainly applied to the surface printing of OBP, BOPP, PET, PA and other films. The dilution solvents are mainly alcohols, esters and benzenes. The solvent of the class is generally not added with solvents of ketones and other aromatic hydrocarbons, because the addition of these solvents easily damages the ink. The adjustment of the ink dryness during printing can be achieved by different alcohol, ester, and ketone solvent ratios.

2. General application knowledge of composite plastic ink

General composite plastic inks are produced from chlorinated polypropylene series resins and are mainly used for surface-treated OPP and BOPPP films for composite packaging. The dilution solvents are mainly ketones, esters, benzene solvents, and are generally not diluted with alcoholic solvents. The addition of alcoholic solvents can cause the ink to be destroyed, causing the ink to thicken or appear "tofu flower" phenomenon. Can't print. The adjustment of ink dryness during printing can be achieved by different ketone, benzene, and ester solvent ratios.

Composite packaging, especially cooked food packaging, is generally printed on PET, PA film, should use polyurethane ink cooking printing, to achieve better adhesion fastness, composite fastness and cooking performance. However, in the compound packaging of the Hunan market, many manufacturers considered the issue of printing costs. Instead of using steamed inks for printing, they chose some common compounded inks based on chlorinated polypropylene systems. Their adhesion was generally poor, and the fastness after compounding was also can. General chlorinated polypropylene system compound ink, can only be boiled at most, must not cook, and use this system of ink to print PET, PA film, must be fully tested, the trial can only be bulk printing.

Second, the introduction of other gravure ink and printing process

Intaglio printing ink, in addition to plastic gravure ink, there are paper gravure ink, aluminum foil gravure ink and so on. Paper Gravure Ink and Aluminum Foil Gravure Ink is a new type of soft packaging printing that has started in recent years, and it has developed rapidly. Paper Gravure Ink and Foil Gravure inks are printed with the same operations as plastic gravure inks. However, the printed substrate is different. Different printing substrates should be distinguished when choosing the ink due to the differences in surface smoothness, absorbability, and the like.

Gravure printing paper, because the surface of the paper is not smooth plastic film; and the paper is absorbent, if the use of plastic gravure ink to print, there will inevitably appear to spend more, less full of color and other phenomena, the right should choose paper gravure ink to print .

Aluminum foil ink is mainly used for printing on pure aluminum foil, mainly used in beer labels, candy paper and other packaging. The manufacture of aluminum foil packaging, because it is necessary to pay attention to the post-processing processes such as slitting and alkaline cooking, the use of plastic gravure ink can not meet the ideal requirements, should use gravure aluminum foil ink to print, with excellent transferability, color brightness, light Brightness, smoothness, softness. And the advantages of good printing and cutting.

In addition, the printing of woven bags is now printed directly on the woven bag and printed on the BOPP film first. Then, the woven bag is compounded with the showering (extrusion) method to form a beautiful, environmentally friendly package. In this type of packaging, attention should not be paid to the use of surface-printed or polyamide-modified inks, but to gravure plastic composite inks. Leaching requires a higher heat resistance of the ink. Table printing inks are not heat-resistant and cannot be compounded. After printing with compound inks, it is also important to note that the time for re-coating should not be too long and must be controlled in an instant so that the ink is thermally destroyed.

Different printing requires the selection of the corresponding ink and must not be used in place of different inks. Only by choosing suitable inks and proper operations can we produce excellent printing and packaging products. The manufacture of flexible packaging is a series of processes, and the printing of flexible packaging is one of the key processes. Only by mastering the technology of gravure printing and knowing the standard operation of gravure printing, can we create excellent packaging and decoration products.