What pretreatment is required for PET matte silver thermal label paper before printing?

Before printing, proper pretreatment of PET matte silver thermal label paper is a key step to ensure printing quality and label paper performance. Here are some common ways to pretreat:

1. Surface tension enhancement

The surface performance of PET matte silver thermal label paper is general, in order to enhance the adhesion of the ink, improve its surface energy or wetting ability, it is usually necessary to perform surface tension enhancement treatment. This can be done in the following ways:

Corona treatment: This is a more common way of pretreatment, through high voltage discharge to achieve. Corona treatment can change the physical and chemical properties of the surface of the material, increase its surface tension, thereby improving the adhesion of the ink and printing effect. Corona treatment can be divided into pre-treatment by the supplier at the time of manufacturing the material and online treatment at the printing press. It should be noted that the surface tension of the material after corona treatment should reach a certain standard (such as 38dyn or more) to ensure the printing quality.

Chemical treatment: In addition to corona treatment, a chemical treatment agent can also be used to pretreat the surface of PET matte silver thermal label paper. This method by coating a layer of special chemical treatment agent on the surface of the material to improve its surface performance, improve the adhesion of the ink and printing effect.

2. Clean and dispose

Before printing, it is also necessary to clean PET matte silver thermal label paper to remove dust, oil and other impurities on the surface. These impurities may affect the adhesion and printing effect of the ink, so they must be completely removed. Cleaning can be done by wiping, vacuuming or cleaning.

3. Other pretreatment methods

In addition to the above two common pretreatment methods, there are some other pretreatment methods to choose from, such as:

Surface coating: Affinity ink or special coating is applied on the surface of the material in advance to improve the wetting ability and adhesion of the ink. This method is relatively low cost, stable and reliable.

Drying treatment: For some PET matte silver thermal label paper that requires special treatment, it may also be necessary to dry it to ensure that its surface is dry and moisture free, thereby improving the printing effect.

Matters needing attention

In the pre-treatment, the appropriate method should be selected according to the specific material and printing requirements of PET matte silver thermal label paper.

The pre-treated material should be printed as soon as possible to avoid changes in surface properties affecting the printing quality.

Use special inks and supporting equipment for printing to ensure the best printing results.

In summary, pre-processing of PET matte silver thermal label paper before printing, such as surface tension enhancement and cleaning treatment, is an important step to ensure printing quality and label paper performance.