What are the processing methods of TPU film materials?

The processing methods of TPU film materials are mainly as follows:
Extrusion blown film method: This is a common processing method. After the TPU particles are heated and melted, they are extruded into a tube by an extruder, and then the tubular film is blown with compressed air so that it fits snugly onto the cooling roller and cools into shape. This method has high production efficiency, can produce a large area of film, and the film thickness uniformity is good.
Extrusion casting method: The TPU molten material is extruded from the slit of the extruder head, cast onto the cooling roller and cooled and solidified into a film. This method produces very thin TPU films with a smooth surface with a controllable thickness, which is suitable for applications with high surface quality requirements, such as optical films.
Injection molding: TPU particles are injected into a mold and molded into a film or article of a specific shape by heat and pressure. This method is suitable for the production of TPU film products with complex shapes and high dimensional accuracy requirements, such as protective films for some electronic devices.
Coating method: TPU solution or emulsion is applied to the surface of the substrate, and then it undergoes drying, curing, and other processes to form a thin film. The appropriate coating method can be selected according to different substrates, such as dip coating, roller coating, spraying, etc. This method is flexible and allows TPU films to be prepared on a wide range of substrates.
Co-extrusion: Multiple extruders are used to extrude different materials at the same time, and composite them into one or more layers of TPU film in a specific mold. The co-extrusion method can make the film have a variety of properties, such as enhancing strength, improving barrier properties, etc., and is widely used in the production of some high-performance films.
In the actual processing process, it is necessary to choose the appropriate processing method according to the specific use of TPU film, performance requirements, production scale and other factors. At the same time, it is also necessary to strictly control the processing process parameters to ensure the quality and performance of the film.