Polyurethane
Ink Binder is the core component of flexible packaging composite ink, directly influencing the ink adhesion, weather resistance and printing effect. When using it, the following details need to be paid close attention to to avoid printing defects and ensure production quality.
In terms of proportioning and curing, the main agent and curing agent should be mixed in the specified ratio to ensure a complete cross-linking reaction. In high-humidity environments, the proportion should be appropriately adjusted to prevent moisture from interfering with the curing effect and avoid problems such as delamination and ink shedding.
The selection of solvents should be reasonable. It is preferable to use the appropriate ester-based true solvents. Add an appropriate amount of solubilizers to improve the leveling property. Avoid using solvents that are prone to residue and have a slow evaporation rate. Prevent plate clogging and ensure that the solvent residue does not exceed the standard. At the same time, adjust the drying speed of the solvents according to the environmental temperature and humidity to meet the printing requirements of different seasons.
The viscosity should be adapted to the printing process and adjusted according to the printing speed. Avoiding improper viscosity can prevent problems such as ink smearing, knife lines, and poor transfer. At the same time, both the leveling property and the printing clarity should be taken into consideration.
The substrate must be compatible. It is only used for the properly treated compatible film. Do not mix it with other system inks. Perform the lamination process promptly after printing to reduce moisture intrusion and solvent residue.
In terms of storage and safety, it should be sealed and stored in a cool and dry place, away from open flames and direct sunlight. After opening the container, use it up as soon as possible. During operation, wear protective equipment to avoid direct contact with skin and eyes, and follow the regulations for handling hazardous chemicals.
In special scenarios such as food packaging, it is necessary to strictly control the residual solvents, adapt to the characteristics of the packaged contents, prevent the ink from being corroded by acids and alkalis and causing fading or peeling, and ensure the safety and compliance of use.
