What are the main causes and prevention methods for the occurrence of cracks in vegetable tanned leather?

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[Abstract]:

Q: What are the main causes and prevention methods for the occurrence of cracks in vegetable tanned leather?

Answer: The phenomenon that the leather surface is bent to a certain shape, and the crack on the leather surface is called a crack surface. The main causes of cracks are:

1. The surface of the raw material skin is damaged, the local surface is hard and cracks appear.

2. The bare skin is partially burnt.

3. After washing with ash, the water is insufficient, and there are calcium salts on the surface.

4, the surface is overfilled, and the retort and rinsing are insufficient.

5, the drying speed is too fast, causing surface rumination.

6. The moisture content of the leather after drying is too low and no reversion treatment is carried out.

To prevent cracks, the following measures can be taken:

1. Strengthen the operation control of the preparatory section to ensure the quality of the bare skin is normal.

2. Strengthen the retreat and rinse.

3. Control the drying speed properly.

4. Apply a proper amount of oil to the surface of the leather.

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What are the main causes and prevention methods for the occurrence of cracks in vegetable tanned leather?