KR102225322B1 - Eco-Friendly Processing Method Of Natural Leather, And Natural Leather Using The Same - Google Patents

Abstract

The present invention relates to an eco-friendly natural leather processing method and natural leather using the same. By using bamboo vinegar in a tanning pre-treatment process, it is possible to induce protein degradation to give flexibility and to exhibit a deodorizing effect, thereby removing the peculiar smell of natural leather. Also, the procession method can not only exhibit an antibacterial effect by killing bacteria that degrade the quality of natural leather, but also reduce the risk of environmental contamination during wastewater treatment.

Description

Eco-Friendly Processing Method Of Natural Leather, And Natural Leather Using The Same}

This invention uses bamboo vinegar liquid in the pre-tanning process to induce protein decomposition to give flexibility and deodorant effect to remove the peculiar odor of natural leather, and to kill bacteria that degrade the quality of natural leather to show antibacterial effect. The present invention relates to an eco-friendly natural leather processing method and natural leather using the same, which can reduce the risk of environmental pollution during wastewater treatment.

Currently, general natural leather is mainly manufactured using the skin of mammals such as cattle, horses, pigs, sheep, goats, birds such as ostrich, or reptiles such as crocodiles, lizards, and snakes.

Among these general leather manufacturing methods, there is a process in which raw material skin is added to remove unnecessary hair, fat, soluble protein, etc. for leather production under alkaline and acidic conditions. In this case, since highly reactive chemicals are used, the possibility of inhaling or contacting harmful substances in the human body during the reaction process and wastewater treatment process is high, and the risk is strong. In particular, since the drug is highly reactive, it is highly toxic when it comes into contact with the human body and causes side effects such as skin rash or destruction of mucous membranes.

In addition, there is a problem that it may cause a secondary cause due to the discharged wastewater, and it may have a harmful effect on the human body if the product is manufactured from leather that remains with chemicals.

Registered Patent Publication No. 10-1518466

This invention is to solve the above problems, by using bamboo vinegar liquor in the tanning pretreatment process, it induces protein decomposition, gives flexibility, and exhibits a deodorizing effect to remove the peculiar smell of natural leather, and an eco-friendly natural leather processing method and Its purpose is to provide natural leather using this.

Another object of the present invention is to provide an eco-friendly natural leather processing method and natural leather using the same, which can not only exert an antibacterial effect by killing bacteria that degrade the quality of natural leather, but also reduce the risk of environmental pollution during wastewater treatment. I have to.

As a means for achieving the above object, in the configuration of the manufacturing method of the present invention, a hair loss step of impregnating natural leather in an aqueous calcium hydroxide solution having a mass concentration of 3 to 5% to depilate hair; A fat removal step of removing fat from the natural leather depilated through the hair loss step using a band knife; A tanning pretreatment step of impregnating the natural leather subjected to the fat removal step into a pretreatment solution; A tanning step of tanning by mixing a tanning agent with the natural leather subjected to the tanning pretreatment step; And a shaving step of adjusting the thickness of the natural leather subjected to the tanning step by using a shaving device.

In the configuration of the manufacturing method of this invention, the tanning pretreatment step includes: preparing a pretreatment solution; Including a step of impregnating by adding 200 to 250 parts by weight of a pretreatment solution, based on 100 parts by weight of natural leather.

In the configuration of the manufacturing method of this invention, the step of preparing the pretreatment solution includes: preparing an aged bamboo vinegar solution; Mixing 15 to 20% by weight of the aged bamboo vinegar liquid and 80 to 95% by weight of purified water; to prepare including.

In the configuration of the manufacturing method of the present invention, the step of preparing the aged bamboo vinegar liquid is obtained by mixing in a weight ratio of smoked bamboo: purified water = 1:3 and allowed to stand for 3 months or more, and a pH of 2-3 is used.

In the configuration of the manufacturing method of this invention, the step of preparing the aged bamboo vinegar liquid comprises the steps of first washing the bamboo with lukewarm water; Steaming the first washed bamboo in a steamer at 90 to 95° C. for 35 to 50 minutes; First drying the steamed bamboo for 5 to 7 hours in a warm air dryer having a temperature of 50 to 60°C; Smoking the dried bamboo for 1 to 3 hours; Secondary washing the smoked bamboo with cold water; Secondarily drying the second washed smoked bamboo in a warm air dryer at a temperature of 50 to 60° C. for 2 to 3 hours; It uses smoked bamboo, which is also manufactured.

In the configuration of the manufacturing method of the present invention, the step of smoking comprises supplying 200 parts by weight of a smoker based on 100 parts by weight of bamboo at 1 hour intervals.

This invention uses bamboo vinegar liquid in the pre-tanning process to induce protein decomposition to give flexibility and deodorant effect to remove the peculiar odor of natural leather, and to kill bacteria that degrade the quality of natural leather to show antibacterial effect. In addition, it can reduce the risk of environmental pollution in wastewater treatment.

1 is a flow chart of a natural leather processing method according to the present invention.

Hereinafter, in order to describe in detail enough that a person of ordinary skill in the art can easily implement the present invention, reference will be made to a preferred embodiment of the present invention and the accompanying drawings. Other objects, features, and operational advantages, including the object, operation, and effect of the present invention, will be made clearer by the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only the ones selected and presented by selecting the most preferred embodiments to aid the understanding of those skilled in the art from among various possible examples, and the technical idea of the present invention is necessarily limited and limited only by the presented embodiments. Rather, various changes and additions are possible without departing from the technical spirit of the present invention, as well as other equivalent embodiments.

In addition, expressions of terms or words used in the specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain it in the best way with his own invention. It should not be interpreted as being limited only to a dictionary meaning, but should be interpreted as a meaning and concept consistent with the technical idea of the present invention. As an example, expressions in the singular include plural expressions unless the context clearly indicates otherwise.

1 is a flow chart of a natural leather processing method according to the present invention.

As shown in Fig. 1, in the configuration of the natural leather processing method according to the present invention, a depilation step (S10) of impregnating the natural leather in an aqueous calcium hydroxide solution having a mass concentration of 3 to 5% for hair loss; Fat removal step (S20) of removing fat from the natural leather depilated through the hair loss step using a band knife; Tanning pretreatment step (S30) of impregnating the natural leather subjected to the fat removal step into a pretreatment solution; A tanning step of tanning by mixing a tanning agent with the natural leather that has undergone the tanning pretreatment step (S40); And a shaving step (S50) of adjusting the thickness of the natural leather subjected to the tanning step by using a shaving device.

In the depilation step (S10), the leather is alkalized to remove hair, and the keratin epidermal layer and unnecessary proteins are removed to relax the fibrous tissue.

In the fat removal step (S20), the fat of the silver cotton layer is removed using a band knife and the raw skin wrinkles are relaxed.

The tanning pre-treatment step (S30) removes foreign substances by acting on the proteolytic enzyme of the leather, and increases the elongation and yield by making the silver surface of the leather clean and flexible. In addition, the tanning agent is evenly added by adjusting the leather to acidity.

The tanning pretreatment step (S30) may include preparing a pretreatment solution (S300); Including; step of impregnating by adding 200 to 250 parts by weight of the pretreatment solution based on 100 parts by weight of natural leather (S301).

At this time, if less than 200 parts by weight of the pretreatment solution is used, the pretreatment uniformity decreases due to insufficient contact with the natural leather, and if it exceeds 250 parts by weight, the production cost increases.

The step of preparing the pretreatment solution (S300) may include preparing an aged bamboo vinegar solution (S3000); Mixing 15 to 20% by weight of the aged bamboo vinegar liquid and 80 to 95% by weight of purified water (S3001); to be prepared, including.

In the step of preparing the aged bamboo vinegar liquid (S3000), smoked bamboo: purified water = 1:3 is obtained by mixing in a weight ratio and allowed to stand for 3 months or more, and having a pH of 2 to 3 is used.

The step of preparing the aged bamboo vinegar liquid (S3000) includes the steps of first washing the bamboo with lukewarm water (S30001); Steaming the first washed bamboo in a steamer at 90 to 95° C. for 35 to 50 minutes (S30002); First drying the steamed bamboo for 5 to 7 hours in a warm air dryer having a temperature of 50 to 60°C (S30003); Smoking the dried bamboo for 1 to 3 hours (S30004); Second washing the smoked bamboo with cold water (S30005); Secondarily drying the second washed smoked bamboo at a temperature of 50 to 60° C. for 2 to 3 hours in a warm air dryer (S30006); and smoked bamboo prepared including it is used.

Bamboo contains a large amount of active ingredients such as polyphenols and saponins.

In the steaming step (S30002), the content of polyphenols exhibiting antibacterial activity may be increased.

In the step of smoking (S30004), the deodorizing effect may be enhanced by inducing thermal decomposition of saponin and converting it to saponin exhibiting a deodorizing effect.

The smoking step (S30004) comprises supplying 50 parts by weight of a smoker based on 100 parts by weight of bamboo at an interval of 1 hour. If the smoker is supplied in excess of 50 parts by weight, there is a problem in that the amount of benzopyrene detected increases.

The tanning step (S40) is a process of imparting mineral properties from animals for commercialization of leather, and may impart resistance to heat and flexibility.

In the shaving step (S50), the six-sided layer of natural leather is cut to clean the surface, and the thickness is adjusted according to the purpose.

(Experimental Example 1)

In order to confirm whether the antibacterial effect is exhibited when pre-tanning using the aged bamboo vinegar liquid prepared according to the above process, natural leather pre-tanning with the aging bamboo vinegar liquid having a different manufacturing method (Example 1, Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5) was prepared, and a bacteria detection test was performed.

For the bacteria detection test, a medium solution prepared by dissolving distilled water and PCA (Plate Count Agar) in distilled water is sterilized at 121°C for 15 minutes using an autoclave. When sterilization is complete, cool the sterilized water and sterilized medium solution to room temperature before use.

The bacteria detection test was performed on a sterile workbench, and 9 mL of sterile water was added to 1 g of natural leather, and a 10-fold diluted solution was evenly mixed using a homogenizer. Add 1 mL of the sample dilution solution to the disposable culture dish, and then add 7 g of the sterilized medium solution. Rotate and shake the culture dish to mix the sample solution and the medium solution. After cooling in a sterile workbench until the medium solution solidifies, transfer to an incubator and incubate at 35°C for 48 hours. The results are shown in Table 1 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Steaming
Condition Temperature(℃) 90 95 - 95 95 85 100 Time (minutes) 50 35 - 35 35 50 35 Pretreatment solution Aged bamboo vinegar liquid (% by weight) 15 20 - 10 25 15 20 Bacteria concentration
(CFU/mL) ≤10 ≤10 5.21×10 ³ 4.02×10 ¹ ≤10 2.31×10 ¹ 3.00×10 ¹

*Comparative Example 1: Natural leather without tanning pretreatment

As shown above, in the case of Example 1, Example 2, and Comparative Example 3, no bacteria were detected, and in the case of Comparative Example 2, Comparative Example 4, and Comparative Example 5, it was confirmed that a small amount of bacteria remained. As the total phenol content increased through the steaming process, it was judged to have a strong antibacterial effect and thus the bacteria were removed. In the case of Comparative Example 5, as the steaming was performed at the highest temperature, it was determined that the content of the active ingredient was rather lowered and the antibacterial effect was lowered accordingly. Based on the results, the amount of bamboo vinegar liquid added in the pre-tanning step is preferably in the range of 15 to 20% by weight in order to remove bacteria.

(Experimental Example 2)

In order to confirm whether the deodorizing effect was enhanced through the manufacturing step of the aged bamboo vinegar liquid, natural leather pre-tanning with aged bamboo vinegar liquid with different manufacturing methods (Example 3, Example 4, Comparative Example 1, Comparative Example 6, Comparative Example 7, Comparative Example 8, Comparative Example 9) was prepared, and a blind test was performed to compare. The evaluation contents were evaluated on a scale of the lowest 1 point and the highest 10 points, and evaluation was conducted after a total of 20 panelists had been sufficiently trained in the sensory evaluation method and evaluation characteristics. The results are shown in Table 2 below.

Example 3 Example 4 Comparative Example 1 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Smoking time (hours) One 3 - 0 0.5 4 5 smell 8.1±0.4 8.2±0.1 2.3±0.2 4.4±0.3 6.4±0.1 8.0±0.1 8.2±0.3

*Comparative Example 1: Natural leather without tanning pretreatment

*Comparative Example 6: Natural leather pre-tanning with aged bamboo vinegar using bamboo manufactured by steaming and drying without smoking step

As shown above, in the case of Comparative Example 1 and Comparative Example 6, the panel evaluated that an unpleasant odor occurred and that the odor remained in the hand after touching the pellet, and a low score was displayed. In the case of Comparative Example 7, the smoking time was short, and the thermal decomposition of saponin was not sufficiently performed, and thus the deodorizing effect was judged to be insignificant. On the other hand, in the examples prepared according to the present invention and Comparative Examples 8 and 9 having a long smoking time, it was evaluated that an unpleasant odor could not be felt. However, in the case of Comparative Example 8 and Comparative Example 9, the amount of benzopyrene detected exceeded the reference value. Therefore, it is possible to prepare the most preferable pretreatment solution for removing the smell of natural leather that is safe by using the smoking stage conditions of this invention.

Claims (7)

delete delete A depilation step of impregnating natural leather with an aqueous calcium hydroxide solution having a mass concentration of 3 to 5% for hair loss;
A fat removal step of removing fat from the natural leather depilated through the hair loss step using a band knife;
A tanning pretreatment step of impregnating the natural leather subjected to the fat removal step into a pretreatment solution;
A tanning step of tanning by mixing a tanning agent with the natural leather subjected to the tanning pretreatment step;
Including; a shaving step of adjusting the thickness of the natural leather subjected to the tanning step using a shaving device,
The tanning pretreatment step,
Preparing a pretreatment solution;
Including; impregnating by adding 200 to 250 parts by weight of a pretreatment solution based on 100 parts by weight of natural leather,
The step of preparing the pretreatment solution,
Preparing an aged bamboo vinegar solution;
Mixing 15 to 20% by weight of the aged bamboo vinegar liquid and 80 to 95% by weight of purified water; eco-friendly natural leather processing method comprising a. The method of claim 3,
The step of preparing the aged bamboo vinegar liquid,
Smoked bamboo: Purified water = 1:3 An eco-friendly natural leather processing method characterized in that it is obtained by mixing at a weight ratio of 1:3 and allowed to stand for more than 3 months and using a pH of 2-3. The method of claim 4,
The step of preparing the aged bamboo vinegar liquid,
First washing the bamboo with lukewarm water;
Steaming the first washed bamboo in a steamer at 90 to 95° C. for 35 to 50 minutes;
First drying the steamed bamboo for 5 to 7 hours in a warm air dryer having a temperature of 50 to 60°C;
Smoking the dried bamboo for 1 to 3 hours;
Secondary washing the smoked bamboo with cold water;
Secondarily drying the second washed smoked bamboo at a temperature of 50 to 60° C. in a warm air dryer for 2 to 3 hours; an eco-friendly natural leather processing method comprising using smoked bamboo. The method of claim 5,
The step of smoking,
An eco-friendly natural leather processing method comprising the step of supplying 200 parts by weight of a smoker based on 100 parts by weight of bamboo at 1 hour intervals. Natural leather, characterized in that produced by the method of any one of claims 3 to 6.

Images