1. Paper quality problem: If the paper used is of poor quality, it is easy to break, bend or wrinkle the paper at the crease.

2. Incorrect folding method: If the organ paper is folded improperly or the folding force is too large, it may cause the paper to wrinkle.

3. Humidity problem: In an environment with excessive humidity, paper is easy to absorb water and deform, and it is easy to wrinkle when folded.

4. Excessive folding times: The more folding times, the greater the thickness and number of layers of paper, which may increase the probability of paper wrinkling.

Therefore, in order to avoid wrinkling when the organ is folded for the last time, we can pay attention to the quality of the paper, fold it correctly and operate it in a dry environment.