Modern printing presses are generally made up of metal components such as plate loading, inking, embossing, paper feeding and folding. As the whole machine itself is of high value, rusting can cause great damage and therefore rust protection packaging for such large machines is essential.

VCI is a science of corrosion protection by applying vapour phase corrosion inhibitor technology. The vapour phase corrosion inhibitor VCI can continue to slowly vapourise and volatilise the corrosion inhibiting gas at room temperature and adsorb it on the bare metal surface, forming a stable protective film of one to two molecules thick, which can effectively prevent the corrosion of metals by oxygen, moisture and other environmental atmospheres. As VCI is continuously volatile, it can always be in a "saturated" state in a closed space, thus achieving long-term, stable and excellent rust prevention.

At present, the application form of oil-free rust-proof packaging is a comprehensive packaging method that integrates VCI technology and dry air technology, while taking into account the harmonisation of the inner and outer packaging to complement each other.