Manufacturing method of recycling leather sheet using fiber of leather

1. A method of preparing recycling leather sheets using leather fibers comprising:

pre-processing where leather wastes are neutralized and fatliquoring agents are adhered wherein the pre-processing includes: neutralizing the leather wastes; washing the leather wastes that have undergone the neutralizing; combining the fatliquoring agents to the leather wastes after the washing; adhering the fatliquoring agents to the leather wastes after the combining; and washing the leather wastes after the adhering;

separating leather fibers from the leather wastes of the pre-processing;

mixing the leather fibers with fibers for improving a tensile strength of the leather fibers to produce a mixed leather fibers; and

forming sheets by combining the mixed leather fibers with raw fabrics for flooring,

wherein the forming includes:

aligning the mixed leather fibers by using carding machines to produced aligned fibers;

stacking the raw fabrics for flooring and the aligned fibers by crossing each other; and

forming sheets by combining the raw fabrics for flooring to the aligned fibers where needle punches hit in 800 to 1,000 times.

2. The method of claim 1 , wherein the neutralizing is performed by mixing 90 to 100 parts by weight of water, 1 to 5 parts by weight of sodium formate, and 1 to 5 parts by weight of sodium bicarbonate based on the 100 parts by weight of the leather wastes.

3. The method of claim 1 , wherein the combining is performed by mixing 90 to 100 parts by weight of water, 0.5 to 1.5 parts by weight of aqueous ammonia, and 15 to 19 parts by weight of fatliquoring agents based on the 100 parts by weight of the leather wastes.

4. The method of claim 1 , wherein the adhering is performed by adding 0.5 to 2.0 parts by weight of formic acid based on the 100 parts by weight of the leather wastes.

5. The method of claim 1 , wherein the separating includes:

cutting the leather wastes that have undergone the pre-processing to 5 to 15 cm by using leather grinding machines;

breaking bonds between leather fibers of the leather wastes by using hammer mills or roll mills; and

separating leather fibers from the leather wastes where the bonds between leather fibers have been broken by using leather cotton gins.

6. The method of claim 1 , wherein the mixing is performed by mixing 10 to 20 parts by weight of the fibers to improve a tensile strength based on the 100 parts by weight of the separated leather fibers.

7. The method of claim 6 , wherein the fibers to improve a tensile strength include at least one of crimped yarn, wool, polypropylene, low melt fiber, and hot melt fiber.

8. The method of claim 1 , wherein the method of preparing recycling leather sheets using leather fibers further comprises pressing the sheets by using roll mills.

9. The method of claim 1 , wherein the method of preparing recycling leather sheets using leather fibers further comprises painting surfaces, and wherein the painting includes: applying binders to sheet surfaces by using roll coaters; drying the binders applied to the sheet surfaces by using dry chambers; forming embossings on the sheet surfaces where the binders are located; and applying top clear coating sprays and antifouling sprays to the sheet surfaces where embossings are formed.

10. The method of claim 1 , wherein the recycling leather sheets comprises: fiber layers including the leather fibers and the fibers mixed with the leather fibers for improving a tensile strength of the leather fibers; and layers of the raw fabrics for flooring located on upper surfaces of the fiber layers with physically or chemically being combined with the fiber layers.