What is PVC thermal transfer film?

What is PVC thermal transfer film?
From the literal meaning of "PVC thermal transfer film", people who have not been exposed to the thermal transfer industry may think that the base film is a thermal transfer film made of PVC material. There are several misunderstandings here.

The following points can help us better understand what PVC thermal transfer film is.

1. To understand PVC thermal transfer film, first of all, start from the fundamentals of thermal transfer technology.
The process characteristics of thermal transfer are to carry out corresponding "thermal transfer film printing" and "thermal transfer processing" according to the material characteristics of the substrate.

2. Secondly, the selection of PVC thermal transfer film base film.
PVC thermal transfer film, the base film commonly used in the industry is PET film. PET film has the characteristics of good stability, uniform tension, and extremely small thickness deviation of the film, so it is the most widely used.

In order to facilitate simple identification, the industry uses "material" plus "thermal transfer film" to indicate the thermal transfer film corresponding to the substrate material.

Therefore, the correct understanding of PVC thermal transfer film is - a thermal transfer film that conforms to the characteristics of PVC material.

After clarifying the concept, let's take a brief look at the production process of PVC thermal transfer film.

pvc thermal transfer film printing process

pvc thermal transfer film printing process can be simply divided into 6 processes:

1.pvc thermal transfer film printing coating process:

Apply the corresponding release agent and protective layer of the pvc thermal transfer film, and cut the blank film after ensuring drying;

2.pvc thermal transfer film pattern printing process:

The gravure plate is installed on the gravure printing machine for calibration and overprinting, and the release film is installed on the gravure printing machine to start the printing of the pvc thermal transfer film

3.pvc thermal transfer film adhesive glue coating process:

Apply the corresponding adhesive glue to the printed pvc thermal transfer film and ensure that the glue is dried;

4.pvc thermal transfer film re-inspection process

5.pvc thermal transfer film striping process

6.pvc thermal transfer film packaging process

3 soft and hard material pvc thermal transfer film

Pvc, polyvinyl chloride, English abbreviation PVC (Polyvinyl chloride polymer =PVC molecular structure), is a thermoplastic resin formed by the polymerization of vinyl chloride under the action of an initiator.

According to the molding conditions of PVC material products, PVC products are divided into "hard PVC" and "soft PVC".

Correspondingly, PVC thermal transfer film can be subdivided into hard PVC thermal transfer film process and soft PVC thermal transfer film process.

1. Hard PVC thermal transfer film

Hard PVC molding conditions

1) Material pipe temperature: 160-190℃

2) Melt softening point: 89℃

3) Thermal deformation temperature: 70℃

The process of PVC thermal transfer film transfer is the process of transferring the pattern on the PVC thermal transfer film to the surface of the product through a thermal transfer machine.

When printing PVC thermal transfer film, the corresponding thermal transfer base film (usually PET film), thermal transfer ink and thermal transfer glue should be selected; during the thermal transfer process of the product, the temperature of the thermal transfer machine is controlled between 140-160 degrees.

2. Soft PVC thermal transfer film

Soft PVC molding conditions

1) Material tube temperature: 140-170℃

2) Melt softening point: 85℃

3) Thermal deformation temperature: 55℃

Compared with the molding conditions of hard PVC, the material tube, softening point and deformation temperature of soft PVC molding are lower than those of hard PVC.

Therefore, when printing PVC thermal transfer film, it should be distinguished from hard PVC thermal transfer film. In the transfer stage, the hot stamping temperature of the thermal transfer machine rubber roller is slightly lower than that of hard PVC products, and it is more suitable to control it between 130-150 degrees.