TPU paint protection film is a new high-performance environmental protection film, which is widely used in the automotive beauty and maintenance industry, and is a common name for transparent paint protection film. Glue, TPU base film, functional coating, and release film form a complete car coating film.

Among them, the coating and glue are applied to the TPU base film through the coating process, and the current mainstream coating process is slit coating, so what is the difference between it and other coating processes? Let's take a look at this article.

The multi-layer structure of the car coating film is coated through the coating process, which combines the functional coating, TPU base film and pressure-sensitive adhesive, and the coating process can be divided into two processes, namely gluing and functional layer process.

The first process: firstly, after the inspection of the raw materials, the TPU substrate enters the workshop, and the gluing is the production process of pressure-sensitive adhesive, and the glue is evenly coated on the surface of the TPU substrate, and the first winding is completed after glue making and drying.

The second process: the second rolling, the functional coating is evenly coated on the other side of the TPU base film, and the functional layer is completed. However, the completion of the two processes does not mean the end of the coating process, and it also needs to go through 3~5 hours, and the semi-finished car coating after the second winding needs to be placed in the maturation room, and after standing in the environment of 55 degrees Celsius for 12~24 hours, the glue and raw materials are fully bonded together, and the performance is more stable.

There are various coating processes, including micro-concave coating, slit extrusion coating, comma scraper coating, gravure coating, and reverse contact coating.

Different coating processes determine different coating methods, and the characteristics of coating methods determine their application in different industrial fields.

1. Micro-concave coating

Micro-concave coating, uniform coating surface, suitable for coating cloth with thin coating thickness, coating thickness (wet glue) 1~80μm, glue viscosity of 1~1000cps, widely used, mostly used in release film, electromagnetic shielding film, aluminum-plastic film, protective film, functional tape, window film and other fields.

2. Slit extrusion coating

Slit extrusion coating: high coating accuracy, uniform surface quality, good repeatability, no volatile, environmentally friendly and clean, coating thickness (wet glue) > 20μm, glue viscosity of 1000~50000cps. It is mainly used in functional tapes, window films, solvent-free OCA coatings, and multi-functional coatings.

3. Comma scraper coating

Comma scraper coating: suitable for high viscosity glue, thicker coating coating, flat coating surface, coating thickness (wet glue) 20~450μm, glue viscosity of 1000~50000cps. It is mostly used in protective films, functional tapes, multi-functional coatings, etc.

4. Slit extrusion & comma scraper dual-purpose coating

Slit extrusion & comma scraper dual-purpose coating, slit extrusion & comma scraper coating method combination, according to the glue viscosity can choose the best coating method, coating thickness (wet glue) 20~450μm, glue viscosity is 1000~50000cps.

5. Gravure coating

Gravure coating, accurate measurement, simple operation, smooth coating surface, fast coating speed, coating thickness (wet glue) 10~25μm, glue viscosity of 10~2000cps.

6. Reverse contact coating

The reverse contact coating operation is simple, the micro-concave coating speed is fast, the coating surface is better, the coating thickness (wet glue) is 10~25μm, and the glue viscosity is 10~2000cps.