Dry method of screen printing screen printing ink

Ink printing is indispensable when printing on screen printing meshs. The technical problem of drying ink is that many people are more vague.

The composition of the ink is first understood:

● Pigments - used to form colors.

• Binders – used to provide viscosity. They usually include a quantitative rosin ester or a hydrocarbon resin.

● Oil - used to provide liquidity. The oils used include linseed oil (dry), soybean oil (non-dry), petroleum (non-dry), and other oils such as tung oil, cottonseed oil, and the like.

Solvent - used to thin the ink and reduce the viscosity of the ink. Low viscosity petroleum distillates are typically used.

● Desiccant - to help the ink harden. They are a catalyst to accelerate the drying reaction of the oxidant.

• Additives – provide abrasion resistance, gloss, and the like.

Detailed drying process of the ink

The first step, oxidation, is the process by which oxygen combines with the oil and varnish in the ink to form a solid.

In the second step, absorption, through this process, the solvent penetrates into the paper and allows oxygen to come into contact with the oil or the varnish. If the solvent penetrates into the paper or the coating is not fast enough, it will reduce the reaction speed of oxygen with oil and varnish, and ultimately extend the drying time.

We need to keep this in mind, and we should note that when the ink is initially printed on the substrate, the solvent in the ink will penetrate into the gaps in the fibers or coating of the substrate. The pigment remains in the dry oil portion, which holds the pigment on the printing surface. However, this has not been

Dry method of screen printing screen printing ink

completely dried, and the ink film becomes very viscous due to the loss of the solvent, so that the ink loses fluidity and stops there for conversion. As the solvent is lost, oxygen reacts with the oil and the resin begins to dry. At this stage, the ink surface is fixed and does not transfer to another sheet of paper in the stack. However, the ink at the center of the ink film remains in a certain liquid state. Depending on the composition of the ink, the thickness of the printed ink film, the nature of the paper or other material, and the environmental conditions, it takes between two minutes and more than one and a half hours for the ink to completely settle.

After the printing is completed, oxidation occurs in the alkyd resin or the dried oil, and oxidation may also occur in the resin. This polymerization results in a three-dimensional, network-like structure of the chemical binder. Oxygen reacts with all of the oil, resin, and the like in the ink to convert the liquid material in the ink film into a solid such that the ink is completely dried.