Talking about ink ink drop solution in label printing

There are many reasons why ink may be lost during the printing of self-adhesive labels.

Reason one: coating defects

Conventional films are divided into coated and uncoated, and the cause of film coating defects leading to ink drop is divided into two cases: for coated film materials, if the surface coating is poorly cured , the ink adhesion will be poor; and the uncoated film material often has poor adhesion to the surface layer and the ink, causing the ink to drop ink.

solution:

The surface layer varnish printing treatment is adopted to protect the surface layer of the ink to prevent the ink from being lost; the surface layer is treated by corona, and the surface value of the surface of the material should be not less than 38 mm/m, and the cause value is lower than 36 mm. /m will directly affect the firmness of the printing ink; the primer on the top layer or the strong adhesion of the ink (the ratio is about 3%) can also improve the ink penetration of the film surface layer; some subsurfaces Synthetic paper materials are not suitable for inspection with 3M tape because of the paper coating properties of the surface coating.

Reason two: tension

For film materials with a corona-treated surface, in order to achieve good ink wetting, the dyne value usually needs to be more than 38mm/m. Below 36mm/m, the problem of ink drop is easy to occur; at the same time, the dyne value of this material It will gradually fade with time, and there will be printing problems. The essence of this problem is the tension problem.

solution:

On-line corona treatment with on-line corona function to improve the surface energy of film materials; intermittent printing machine can be used for surface primer treatment to improve surface printing adhesion; when the dyne value subsides When printing, it needs to be treated with corona, but the size of the dyne value does not fully represent the adhesion between the ink and the face material. Generally, the regression period of the dyne value is 3-6 months, so it is recommended to minimize the inventory. Long-term storage of raw materials.

In addition, it is recommended to use inks with a higher adhesion type. It is recommended to consult the ink supplier.

Reason three: ink drying and tension

In the process of self-adhesive label printing, the cause of ink drying and tension may also cause ink loss. Specifically, it is divided into: the printing ink layer is too thick to make the drying incomplete; the UV lamp energy is insufficient, the lamp tube is aging, the lamp tube reflector is aging, the UV lamp drying and curing is insufficient, the ink layer is not dried; the ink is excessively dried, resulting in material deformation and formation. The ink layer is peeled off.