The role and advantages of coated film substrate
Adhesive film substrate is a solid sheet of thermoplastic or partially cured (B-stage) thermosetting polymer, which can be cut to a certain size and is usually used to connect large-area components, substrates and covers. The coated film substrate is a thin layer of high-performance adhesive supported by a backing material. They are relatively thin, but they provide adhesive properties similar to fasteners, screws, rivets, and welding, and are suitable for many applications.
The backing of the glue-coated film substrate can be made of many types of materials, including paper, plastic, cloth, foil, foam, and so on. The backing can be coated with adhesive on one or both sides, and can be combined with a release liner if necessary. The adhesive-coated backing is usually wound into a roll and die cut to the desired length and shape. These films can also be formulated with different adhesive chemistries to provide beneficial properties suitable for unique applications.
Unlike liquid glue, the glued film substrate is applied in solid form and will not "squeeze out" when compressed between two surfaces. In addition, since the glue-coated film substrate does not contain liquid, there is no pot life or gel time, so it can be stored indefinitely. These features make it an ideal choice for automated processes and industrial applications that need to avoid time-consuming confusion and maintenance issues.
Introduction of different types of coated film substrates (the following three types)
1. Pressure Sensitive Adhesive Film
Pressure Sensitive Adhesive Film (PSA) is an adhesive tape that is activated by applying external pressure. The film consists of a pressure sensitive adhesive coated on a backing material (usually on one side). There is usually a release liner on the other side of the backing to facilitate manual pressure application. PSA is sticky at room temperature and can be used to bond a variety of materials, including paper, plastic, metal, and concrete. Depending on the application, these adhesives can reach bonding pressures up to 30 psi. PSA is suitable for use in environments where the temperature is between 59º F and 95º F. Lower temperatures can cause insufficient wetting or insufficient coverage of the adhesive on the substrate. However, extremely high temperatures may cause the adhesive film to stretch or warp during application.
2. Heat activated film
Unlike pressure-sensitive adhesives, heat-activated adhesive films remain tack-free before being activated by an external heat source. The high temperature (usually 180º F or higher) must be maintained on the film for a specific length of time to achieve sufficient adhesion. During the cooling process, the microstructure of the adhesive begins to crystallize, significantly increasing the bond strength. Heat activated adhesives are particularly corrosive and can bond difficult surfaces, including rubber and polymer-based materials. Heat activated adhesives can also be customized and provide a variety of backing materials.
3. Moisture-proof tape
Moisture activated tape, as the name suggests, is an adhesive compound that becomes viscous when wetted with water or any other liquid solution. This type of adhesive film is usually backed by kraft paper, which is relatively cheap compared to other adhesives.
Advantages of coated film substrate:
Relatively high bonding strength and excellent chemical resistance are the main advantages of coated film substrates. The cross-linking reaction that occurs during the curing process will form a rigid bonding structure, which is a pressure-sensitive or moisture-activated adhesive Unmatched membranes can be used continuously or in a batch bonding process for precise and fragmented applications on a large surface area. This feature is particularly useful for automated processes with high production speeds.
These coated film substrates are also compatible with surfaces that other adhesive solutions cannot bond, such as:
Aluminum foil、PVC、Polyurethane、EPDM rubber
This compatibility makes adhesive film substrates a popular choice for lamination, molding, and thermoplastic welding in a wide range of applications.