The main raw material for paper corner protectors is usually pulp, which is a cellulose mixture made from wood, waste paper or other cellulose raw materials. The following are some common materials for making paper corner protectors:

1. Wood fiber: Most paper corner protectors use wood fiber as the main raw material. The wood is dehydrated, cut, and pulped to make pulp, which is then shaped and dried to form paper corner protectors.

2. Waste paper: Waste paper is recycled fibers from paper that has been used. Waste paper recycling helps reduce the need for raw wood resources, so waste paper fibers are often used in environmentally friendly paper corner protectors.

3. Bamboo fiber: Some paper corner protectors may be made from other cellulosic materials such as bamboo. Bamboo is a fast-growing plant that can be used as a sustainable alternative raw material.

4. Other cellulose raw materials: In addition to wood and waste paper, some paper corner protector manufacturers may try to use other cellulose raw materials, such as flax, hemp, etc.

The process of making paper corner protectors usually involves processing the pulp into the desired shape, then drying and shaping it into a strong paper corner protector. Some chemicals can be added to the paper corner protector as needed to improve the strength, waterproof performance and other characteristics.

The main raw material for paper corner protectors is pulp, which can be made from many different cellulose raw materials. During the manufacturing process, it can be customized according to specific needs to meet the requirements of different applications.