Introduction to PET heat transfer film printing process

PET heat transfer film is a kind of printing material widely used in clothing, textile and other industries. Its printing process can achieve high-precision pattern transmission and efficient thermal transfer. Today we will introduce the printing process of PET heat transfer film, focusing on the two important processes of screen printing and automatic hot melt powder spreading, as well as matters that need to be paid attention to during operation.

1. Screen printing

Screen printing is the first step in PET heat transfer film printing. Its function is to transfer the designed pattern to the PET film through the screen printing machine. This process has high requirements on printing accuracy and pattern reproduction. The following points need to be paid special attention to during the screen printing process:

1.Choose the right ink : PET heat transfer film usually uses environmentally friendly ink, which has strong adhesion and heat resistance and is suitable for subsequent thermal transfer processes.

2.Adjust the screen tension : The screen tension will affect the clarity of the pattern. Make sure the tension is even to avoid blurring or ghosting.

3.Control printing speed and pressure : Printing speed and pressure directly affect the uniformity of ink coating and detail restoration, and should be adjusted appropriately according to the complexity of the pattern and the characteristics of the ink.

After screen printing is completed, the pattern will be firmly attached to the PET film, laying a good foundation for the subsequent hot melt powder process.

2. Automatic hot melt powder spreading

Spreading hot melt powder is a key step in the PET heat transfer film process. Its main function is to enhance the adhesion and durability of the pattern. The hot melt powder will evenly cover the printed pattern and form an adhesive layer after heating, which is convenient for subsequent thermal transfer to the fabric. The automatic hot melt powder spreading process needs to pay attention to the following aspects:

1.Control the amount of powder : Too much powder will cause the edge of the pattern to be blurred, and too little powder will affect the bonding strength. It is usually recommended to spread the powder evenly to ensure that the edge of the pattern is clear and complete.

2.Temperature and time control : After sprinkling the powder, the hot melt powder needs to be solidified. The temperature and time settings need to be adjusted according to the type of powder to avoid excessive temperature causing ink discoloration or pattern deformation.

3.Prevent powder from flying : During the powder spreading process, powder is easy to fly. It is recommended to use a dust suction device or a confined space to operate to keep the working environment clean and ensure that the powder is evenly spread.

3. Operation precautions

1.Environmental control : Temperature and humidity will affect the drying speed of the ink and the adhesion effect of the hot melt powder. It is recommended to operate in an environment with stable temperature and moderate humidity.

2.Equipment maintenance : Screen printing machines and powder spreading equipment should be maintained regularly to ensure equipment accuracy and stability and avoid deviation or uneven printing during the printing process.

3.Quality inspection : After printing and powdering, the PET film should be inspected to ensure the integrity and adhesion of the pattern to avoid defective products entering the next process.

In general, the printing process of PET heat transfer film is closely linked, and each step of operation directly affects the quality of the finished product. Through reasonable screen printing and automatic hot melt powder spreading process, the clarity and durability of the heat transfer pattern can be ensured, providing higher quality heat transfer effects for the clothing and other industries.