News

Film-forming polyurethane binder are commonly used in printing ink formulations to provide excellent adhesion, flexibility, and durability to the printed film. When it comes to gravure reverse printing inks, which are applied to a printing plate with recessed image areas, the ink needs to have specific properties to ensure proper transfer and adhesion to the substrate.

One suitable polyurethane binder for gravure reverse printing ink is a solvent-based-component polyurethane system. This type of resin typically consists of two components: a polyol component and an isocyanate component. The polyol component contains a hydroxyl-functional polymer, such as a polyester or a polyether polyol, while the isocyanate component typically consists of an aliphatic or aromatic diisocyanate.

Here are some key characteristics and advantages of film-forming polyurethane binder for gravure reverse printing ink:

1. Adhesion: Polyurethane binder exhibit excellent adhesion to various substrates, including plastic films, papers, and metals. This ensures that the printed ink adheres well to the substrate surface and resists rubbing, scratching, and peeling.

2. Flexibility: Polyurethane binder provide flexibility to the ink film, allowing it to conform to the contours of the substrate without cracking or flaking. This is particularly important for packaging materials that undergo bending, folding, or stretching.

3. Chemical resistance: Polyurethane binder offer good resistance to chemicals, solvents, and oils, ensuring that the printed image remains intact even when exposed to harsh environments or cleaning agents.

4. Gloss and transparency: Polyurethane binder can be formulated to provide a range of gloss levels, from high gloss to matte finishes. Additionally, they can offer excellent transparency, allowing printed graphics or images to be visible through the ink film.

5. Fast drying: Polyurethane binder can be formulated to have fast drying characteristics, which are essential for high-speed printing processes like gravure printing. This enables efficient production and reduces the risk of smudging or offsetting.

It's worth noting that the specific formulation of a polyurethane binder for gravure reverse printing ink can vary depending on the desired properties, substrate, and printing conditions. Ink manufacturers and formulators often customize the resin composition by incorporating additives, pigments, and other performance-enhancing ingredients to meet specific application requirements.

When selecting a polyurethane binder for gravure reverse printing ink, it is recommended to consult our company with solvent based and waterborne polyurethane(PU)binder for your application