Ⅰ. Incomplete transfer
1. Reasons: insufficient transfer temperature, insufficient pressure, too short transfer time, etc.
2. Solutions:
1) Increase the transfer temperature appropriately to ensure uniform temperature distribution;
2) Increase the transfer pressure, but be careful not to be too large to avoid damaging the sheet;
3) Extend the transfer time to ensure the pattern is fully transferred to the PET sheet.

Ⅱ. Color deviation
1. Reasons: quality problems of the thermal transfer film, unstable temperature and pressure during the transfer process, and the color influence of the PET sheet.
2. Solutions:
1) Choose a reliable thermal transfer film to ensure accurate color;
2) Stabilize the temperature and pressure during the transfer process, and use professional thermal transfer equipment for precise control;
3) If the color of the PET sheet itself affects the transfer effect, consider properly treating the sheet before the transfer or choosing a suitable base color.

Ⅲ. Blurred pattern
1. Reasons: There are bubbles between the thermal transfer film and the PET sheet, uneven transfer pressure, insufficient resolution of the thermal transfer film, etc.
2. Solution:
1) Ensure that the thermal transfer film and PET sheet are tightly fitted before transfer and remove bubbles;
2) Adjust the transfer pressure to make the pressure evenly distributed;
3) Select a thermal transfer film with high resolution to obtain a clear pattern.

Ⅳ. Poor adhesion
1. Reasons: poor surface treatment of PET sheet, incompatibility of thermal transfer film with sheet, inappropriate transfer temperature and pressure, etc.
2. Solution:
1) Perform appropriate surface treatment on the PET sheet to increase surface energy and enhance adhesion;
2) Select a thermal transfer film compatible with a PET sheet;
3) Adjust the transfer temperature and pressure to find the best transfer conditions to ensure that the pattern is firmly attached to the sheet.

Ⅴ. Wrinkled thermal transfer film
1. Reasons: quality problems of thermal transfer film, improper operation during transfer, etc.
2. Solution:
1) Choose a good quality thermal transfer film to ensure the flatness of the film;
2) During the transfer process, be careful to avoid wrinkling of the thermal transfer film.
3) You can use professional tools to assist in the transfer to ensure that the film and the sheet are flatly attached.