What preprocessing is required for BOPP synthetic label paper before printing?

BOPP synthetic label paper usually requires the following preprocessing before printing:

1、 Surface cleaning treatment

Purpose: To remove impurities such as dust and oil on the surface of label paper, ensure that printing ink can evenly adhere to the surface of label paper, and improve printing quality.

Method: You can use a clean soft cloth or professional cleaning paper to gently wipe the surface of the label paper, or you can use an appropriate cleaning agent for cleaning, but be careful to choose the appropriate cleaning agent to avoid damaging the label paper.

2、 Surface tension adjustment

Purpose: To improve the surface tension of label paper, enabling it to better absorb ink and ensure the clarity and adhesion of printed patterns.

method:

Corona treatment: The surface of label paper is treated by high-frequency and high-voltage discharge of electrodes to activate its surface and increase surface energy. This is currently one of the most commonly used methods to quickly and effectively increase the surface tension of label paper.

Flame treatment: Use a flame to briefly burn the surface of the label paper, roughening its surface and increasing polar functional groups, thereby increasing surface tension. But this method requires strict control of flame temperature and burning time to avoid excessive damage to the label paper.

Coating treatment: Apply a special coating material on the surface of the label paper to increase its surface tension. The selection of coating materials should be matched according to the type of printing ink and the material of the label paper.

3、 Static elimination treatment

Purpose: To eliminate static electricity on the surface of label paper, prevent static electricity from interfering with printing equipment, and ensure that ink can evenly adhere to the surface of label paper.

Method: Static eliminators can be used to eliminate static electricity on label paper, or the label paper can be placed in a relatively high humidity environment for a period of time before printing to reduce its surface static electricity level.

4、 Other preprocessing measures

Cutting according to printing requirements: Based on the specific printing equipment and label size requirements, the label paper is cut to ensure that it can smoothly enter the printing equipment and complete the printing task.

Preheating treatment: In some cases, to improve the drying speed and adhesion of ink, label paper can be preheated. The preheating temperature and time should be specifically set according to the ink type and label paper material.

In summary, BOPP synthetic label paper requires surface cleaning treatment, surface tension adjustment, static elimination treatment, and other pre-treatment measures before printing. These preprocessing measures can ensure that label paper has good printability during the printing process, improving printing quality and efficiency. At the same time, different preprocessing measures should be selected and applied according to specific situations to achieve the best printing effect.