The structure and surface treatment of heat shrinkable sealing film.

The structure and surface treatment of heat shrinkable sealing film.

11-08-2022

1. Structure of heat shrinkable sealing film.

The film structure of heat shrinkable sealing film is similar to that of paper. The difference is that the film surface of the sealing film needs to be treated.

2. Surface treatment of heat shrinkable sealing film.

The principle of the ink layer forming the pattern on the printed matter is penetration, volatilization, bonding and curing. However, due to the high density of the film, the ink only "volatilizes" and "combines", and there is no penetration during the curing process, so the surface of the heat shrinkable sealing film needs special treatment. 

After the treatment, the surface tension of the heat shrinkable sealing film is increased, so that the heat shrinkable sealing film is larger than the surface tension of the ink, so as to achieve the correct combination of the ink and the film material.

3. Three ways of surface treatment of heat shrinkable sealing film:

① Corona treatment: The surface of the film is subjected to discharge treatment through high-voltage charges to achieve the purpose of enhancing surface energy and surface tension.

 Corona treatment is generally performed in a film manufacturing plant. Because surface tension is time-limited, rigorous testing is required before printing. Some advanced equipment with pre-press corona treatment device is to print high quality film products.

 Printing treatment: Chemically change the surface properties of the heat shrinkable sealing film to make it suitable for ink printing or ribbon printing.

 Surface coating: The surface of the film is coated with chemicals to increase the surface tension and change the surface properties.

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