Causes and Solutions of Poor Ink Adhesion Fastness of Screen Printing Machine

The reasons and solutions for the poor adhesion fastness of printing ink, the screen printing machine manufacturer will explain the reasons for you:

PVC screen printing machine

The adaptability of the printing substrate product is poor, and the wetting tension is low.

Additives (plasticizers, surfactant slip agents, etc.) in the printing substrate film form a precipitation layer, which affects the adhesion fastness of the ink layer.

The printing substrate itself absorbs moisture.

Poor ink performance, misuse of ink or mixing of different inks.

Changes in ink properties (deterioration, whitening).

Poor drying and many residual solvents.

The package contents and environmental conditions reduce the adhesion fastness..

Solution:

Measure the wetting tension, and replace the printing substrate if it fails. For corona-treated films, the degree of treatment Z is important. Whether the treatment is qualified and whether it should be determined by the wetting tension test solution

Confirm the precipitation on the surface. If the precipitation layer affects the ink adhesion fastness, replace the printing substrate or consult with the ink manufacturer for proper disposal. When using a certain kind of film for the first time, it is necessary to investigate its properties and characteristics as much as possible beforehand, and select a suitable ink.

Change the ink or confirm the ink adhesion fastness of the ink is appropriate. Intaglio inks are mostly produced for specific purposes, and should be avoided for other purposes or mixing of dissimilar inks. And in order to prevent misuse, the remaining ink should be clearly recorded in the relevant content, date, etc. in preparation for reuse.

Solve the problem of ink deterioration and whitening.

Adjust the drying conditions to solve the problem of residual solvent or reduce the residual solvent to the specified limit.

Implement humidity control at the printing site. Keep the films and printed materials such as vinylon, cellophane, nylon, etc., which are easy to absorb moisture, and prevent them from getting damp.

These are the screen printing when printed products machine ink adhesion fastness reasons for the poor and solutions..