When lubricating the printing rollers, specialized lubricants should be used to ensure their normal operation and extend their lifespan. The following are some common types of lubricants:

1. Oil lubricant: Oil lubricant is a common lubricant with good lubrication and rust resistance, suitable for various types of printing rollers.

2. Lubricating oil: Lubricating oil is a liquid lubricant with good fluidity and lubrication performance, suitable for high-speed printing rollers.

3. Lubricating grease: Lubricating grease is a semi-solid lubricant with good lubrication and sealing properties, suitable for low-speed printing rollers.

4. Synthetic lubricant: Synthetic lubricant is a new type of lubricant with good lubrication and rust resistance, suitable for various types of printing rollers.

It should be noted that when selecting lubricants, the selection should be based on factors such as the material of the printing roller, printing process, and lubricant performance to ensure the effectiveness and safety of the lubricant. Meanwhile, when using lubricants, it is important to follow the instructions for their use to avoid waste and contamination.