Drying paper corners may cause some undesirable changes to the paper, including shrinkage. Shrinkage is the phenomenon in which paper may lose moisture and shrink in size when it is dried or exposed to the air. Here are some factors that can cause paper to shrink:

1. Humidity: Humidity in the environment is an important factor. If the paper is exposed to a very dry environment, it may lose moisture and shrink. This is usually because water in the paper evaporates, causing the paper to shrink.

2. Temperature: Temperature changes may also affect paper size. Rapid temperature changes can cause paper to expand or contract.

3. UV exposure: Prolonged exposure to sunlight or UV rays can have negative effects on paper, including possible color fading and distortion of the paper.

4. Paper type: Different types of paper (such as ordinary document paper, art paper, packaging paper, etc.) may react differently to drying and environmental conditions.

If you need to dry paper, especially important documents or artwork, it is recommended to handle it with caution and avoid extreme humidity and temperature conditions as well as direct sunlight. In addition, undesired size reduction or other damage can be reduced by using specially designed paper drying equipment or methods. It is best to store and handle paper properly and under appropriate environmental conditions to ensure that it remains intact for a long time.