A PROCESS FOR TANNING ANIMAL HIDES

Abstract

A process for tanning animal hides comprising the steps of: providing a container comprising a pickled hide, a tanning agent and optionally an aqueous solution, where the total amount of water in the container is no more than 110% of the total water that can be retained by the pickled animal hide, and where the total amount of tanning agent in the container is no more than 110% of the total tanning agent that can be retained by the pickled animal hide, and basifying the animal hide to bind the tanning agent in the animal hide.

Claims

1. A process for tanning animal hides comprising the steps of: providing a container including contents, the contents comprising a pickled hide and a tanning agent, where a total amount of water in the container is no more than 110% of a total amount of water that can be retained by the pickled animal hide, and where a total amount of tanning agent in the container is no more than 110% of a total amount of tanning agent that can be retained by the pickled animal hide, and basifying the animal hide to bind the tanning agent in the animal hide, where an amount of pressure inside the container is substantially similar to an amount of pressure surrounding the container or is at atmospheric pressure.

2. The process of claim 1, wherein the animal hide is sammyed prior to providing the animal hide in the container.

3. The process of claim 1, wherein contents of the container further comprise an aqueous solution.

4. The process of claim 1, wherein the tanning agent comprises one or more chemicals, the one or more chemicals being provided in a mixture or individually.

5. The process of claim 1, wherein the tanning agent comprises at least one of: a fungicide, a slippery agent, and a fat liquor.

6. The process of claim 1, wherein the total amount of water that can be retained in the animal hide is calculated based on the initial weight of the animal hide prior to a de-liming step of the animal hide.

7. The process of claim 1, wherein the total amount of water in the container is no more than 105% of the total amount of water that can be retained by the pickled animal hide.

8. The process of claim 1, wherein the total amount of tanning agent in the container is no more than 105% of the total amount of tanning agent that can be retained by the pickled animal hide.

9. The process of claim 3, wherein a pH of the aqueous solution is less than 7.

10. The process of claim 1, wherein an aqueous solution is added to the container so that the total amount of water in the container does not exceed more than 110% of the total amount of water that can be retained by the pickled animal hide.

11. The process of claim 1, wherein an amount of water retained in the animal hide is reduced to approximately 50-90% of the total amount of water that can be retained by the pickled animal hide prior to providing the animal hide in the container.

12. The process of claim 1, wherein the total amount of tanning agent is calculated based on the initial weight of the animal hide prior to a de-liming step of the animal hide.

13. The process of claim 1, wherein the total amount of water in the container is no more than 100% of the total amount of water that can be retained by the pickled animal hide.

14. The process of claim 1, wherein the total amount of water in the container is no more than between 90-99% of the total amount of water that can be retained by the pickled animal hide.

15. The process of claim 1, wherein the total amount of tanning agent in the container is no more than 100% of the total amount of tanning agent that can be retained by the pickled animal hide.

16. The process of claim 3, wherein a pH of the aqueous solution is less than 6.

17. The process of claim 3, wherein a pH of the aqueous solution is less than 5.

18. The process of claim 3, wherein a pH of the aqueous solution is less than 4.

Description

EXAMPLES

Example 1

[0028] This example discloses a tanning process of an animal hide, where the animal hide is drained after pickling and introduced into a tanning drum (container), and where the amount of tanning agent (Baychrome A, Busan 1280, Dilution water for Busan) has been added as a percentage of the weight of the pickle.

[0029] The pickle weight of the animal hides was 9115 Kg, and the animal hides were introduced into the tanning drum (container) where the animal hides were only drained, and not sammyed. Thus, the pickle weight represents the animal hides having a water content that is substantially 100% of the total water that can be retained in the animal hide.

[0030] Based on calculation on the pickle weight, 4.8% (438 kg) of a tanning agent, Baychrome A, was introduced into the container in powder form. In addition to this 0.2% (18.2 kg) of fungicide, Busan 1280, was introduced into the container, as well as 1.30% (118.5 kg) water for diluting the fungicide was introduced into the container.

[0031] The following table shows the amount of time in minutes and the temperature of the tanning process to obtain tan the animal hides in accordance with the process in accordance with the invention.

TABLE-US-00001 Time Temperature 360 Ambient 60 Temp: 29° c. 60 Temp: 31° c. 60 Temp: 33° c. 60 Temp: 36° c. 60 Temp: 39° c. 180 Temp: 42° c.

[0032] The use of Baychrom A, which is a self basifying Chrome Sulfate, there may be no need for additional basifying agent, and the basifying may be obtained by increasing the heat inside the container as well as approximately 8 hours of tanning. Alternatively, the resulting animal hides were subsequently basified, according to conventional basification methods. As an example, the basification may be performed by the introduction of 0.4% (36.5 kg) Feliderm MgO into the container, where the basification process may be run for eight hours.to bind the tanning agent in the animal hides.

Example 2

[0033] This example discloses a tanning process of an animal hide, where the animal hide is sammed after pickling and introduced into a tanning drum (container), and where the amount of tanning agent (Baychrome A, Busan 1280, Dilution water for Busan) has been added as a percentage of the weight of the pickle.

[0034] The pickle weight of the animal hides was 8121 Kg, and the animal hides were introduced into the tanning drum (container) where the animal hides were sammyed. The weight of the pickle float that was sammyed from the pickle weight was 2277 kg, and therefore the weight of the pickled hides was 5844 kg. Thus, the pickle weight represents the animal hides having a water content that is substantially 72% of the total water that can be retained in the animal hide, as the weight pickle float is approximately 28% of the pickle weight.

[0035] Based on calculation on the pickle weight, 4.8% (390 kg) of a tanning agent, Baychrome A, was introduced into the container in powder form. Alternatively, it may be added in liquid form after dilution in the pickle solution. In addition to this 0.2% (16 kg) of fungicide, Busan 1280, was introduced into the container, as well as 1837 kg of pickle float, along with 0.4% (32 kg) of Liquid slippery agent (Zeteslip ECS) Due to the introduction of pickle float there was no need to dilute the fungicide (Busan 1280) and this was combined with the pickle/or tanning agent solution.

[0036] The following table shows the amount of time in minutes and the temperature of the tanning process to obtain tan the animal hides in accordance with the process in accordance with the invention.

TABLE-US-00002 Time Temperature 180 Ambient 60 Temp: 29° c. 60 Temp: 31° c. 60 Temp: 33° c. 60 Temp: 36° c. 60 Temp: 39° c. 180 Temp: 42° c.

[0037] The resulting animal hides were subsequently basified, according to conventional basification methods. As an example, the basification may be performed by the introduction of 0.4% (36.5 kg) Feliderm MgO into the container, where the basification process may be run for eight hours.to bind the tanning agent in the animal hides, e.g. in case of Chromosal B is being used as a tanning agent.

[0038] In accordance with the information provided in the two examples may be performed equally effective without the samming step. I.e. to introduce the animal hides into the container without samming.