What is the release film made of?

Release film is a film material with a special non-adhesive surface, which is usually made in two parts: the substrate and the coating.

The substrate is the main body of the release film. Commonly used substrate materials include different types of plastic films such as polyethylene (PE), polyester (PET), polypropylene (PP) polyurethane (PU), and even natural materials such as paper. These materials have been chosen for their excellent mechanical strength, good transparency, suitable flexibility and relatively economical cost. These substrate films are processed to form the required thickness and size to meet the release requirements of different applications.

The coating is a special layer on the surface of the release film, giving the film non-tacky or low-tack properties, its main component is usually silicone oil or other silicone-based compounds. Silicone oil, due to its stable chemical properties and very low surface tension, can form an effective barrier layer on the surface of the substrate, so that viscous substances, such as glue, prepreg, etc., will not be bonded to other surfaces during processing and storage. In addition, some release liners may be coated with fluorine compounds, especially for applications requiring higher chemical resistance or high-temperature resistance.

The process of making a release film usually includes the selection and preparation of the substrate, the preparation of the coating material, the coating process, and the subsequent curing and finishing. The coating process is the key part of the whole production process, which needs to ensure the uniform distribution and thickness of the coating to obtain an excellent mold release effect. In addition, to meet the needs of different applications, release liners can be diversely customized, such as by adding antistatic agents, colorants or UV protection layers to provide additional functionality.

With its versatility and wide range of applications, release films have a very important place in industrial production. Whether it is in the screen protection film for electronic products, paint spraying film for the automotive industry, or labeling stickers for daily life, you can see the figure of the release film. With the development of material science and engineering technology, the release of film will show its unique value in more fields in the future.