PET Film

PET molecular structure is highly symmetrical, has a certain ability to crystal orientation, due to its molecular particularity, the general coating is difficult to attach on its surface, directly on its surface for spraying or printing, the coating is easy to peel, fall off. In order to increase the adhesion of PET material, it is necessary to pretreat its surface. There are mainly the following ways:

[1] Corona treatment

By corona treatment, the molecular structure of the substrate surface is rearranged to produce more polar parts, which is conducive to the adhesion of foreign objects. In order to make the PET substrate Dyne value should not decay with the passing of time, secondary corona treatment should be carried out on the PET substrate surface when spraying and printing. The machinery is expensive and complex to operate, and is not used by small and medium-sized enterprises.

[2] Flame treatment

The flame treatment head is covered on the PET surface, so that it instantly reaches a high temperature of 1000 degrees Celsius, and at high temperature, the macromolecules on the PET surface undergo oxidation reaction to produce polar groups, thereby increasing its adhesion. Due to the flame treatment temperature and the contact distance between the flame and PET, the PET surface will be burned due to poor operating contact or too long contact time.

[3] PET Promoter / primer

1.With PET Promoter / primer on the PET surface for 10-15 μm spraying (coating), after drying can be rolled up, and can be reprinted or sprayed on its coating at any time within a year.

2.With PET Promoter /primer main agent, can add color paste, gold and silver powder, conductive material, magnetic material on PET material screen printing, spraying, printing.

3.PET Promoter / primer low price, easy to operate, widely used in film printing, keyboard screen printing, conductive, magnetic coating carrier, model pre-coating PET material.

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