KR102621692B1 - Manufacturing method of leather fabric recycling natural leather wastes - Google Patents

Abstract

The present invention relates to a method for manufacturing leather fabric by recycling natural leather waste, comprising the steps of preprocessing natural leather waste; A pulverizing step of pulverizing the pretreated natural leather waste; A mixed yarn manufacturing step of manufacturing leather yarn using the pulverized natural leather waste and manufacturing mixed yarn using the leather yarn, spandex yarn, and nylon fiber yarn; A leather sheet manufacturing step of manufacturing a leather sheet using the pulverized natural leather waste; and a leather fabric manufacturing step of manufacturing leather fabric by intertwining the leather sheet with the mixed yarn, wherein the mixed yarn manufacturing step includes manufacturing leather fiber cotton using the pulverized natural leather waste. and a leather fiber cotton spinning step of spinning the leather fiber cotton to produce leather yarn, and a multiple mixing step of mixing the leather yarn, spandex yarn, and nylon fiber yarn to produce a mixed yarn, and the multiple mixing step. A mixed yarn is manufactured in which a single or plural leather yarn is placed at the center, and a plurality of spandex yarns and a plurality of nylon fiber yarns cross each other in an X shape to surround the leather yarn.
According to the present invention, leather fabric can be produced in an environmentally friendly manner and at low cost.

Description

Manufacturing method of leather fabric using recycled natural leather waste {MANUFACTURING METHOD OF LEATHER FABRIC RECYCLING NATURAL LEATHER WASTES}

The present invention relates to a method of manufacturing leather fabric by recycling natural leather waste, and more specifically, to a method of manufacturing leather fabric by recycling natural leather waste, which is environmentally friendly and can produce leather fabric at a low cost.

In order to process natural leather to make products such as wallets or bags, appropriate cutting is required. During this process, shaving scraps generated when the leather surface is shaved, and leather pieces or scraps cut to adjust size are generated as waste. I do it. The waste of natural leather generated in this way appears to be at a significant rate compared to raw leather.

Meanwhile, while environmental pollution is creating a major social problem, the disposal of leather waste is also contributing to this problem. In the case of natural leather, physical and chemical pretreatment is required to remove the coated film or to turn it into fiber, but this process incurs considerable time and cost, so most of it is not recycled and is discarded. Disposal is done through incineration or landfill, and hazardous substances generated during this process seep into the soil or groundwater, causing serious environmental problems.

In order to solve the above problems, research has been conducted on separating and reusing chromium from leather waste or using it as a liquid fertilizer through chromium separation, but this did not bring satisfactory results due to poor economic feasibility. As a result, methods for manufacturing new products by separating fibers through grinding leather waste, etc., attracted attention, and various attempts were made to do so, but leather fabrics recycled and manufactured in this way had problems with poor quality such as durability and elasticity. .

Republic of Korea Patent Publication No. 10-2017-0108282

The purpose of the present invention is to solve the above-described conventional problems and to provide a method for manufacturing leather fabric by recycling natural leather waste, which is environmentally friendly and can produce leather fabric at low cost.

The above object is, according to the present invention, a pre-treatment step of pre-treating natural leather waste;
A pulverizing step of pulverizing the pretreated natural leather waste; A mixed yarn manufacturing step of manufacturing leather yarn using the pulverized natural leather waste and manufacturing mixed yarn using the leather yarn, spandex yarn, and nylon fiber yarn; A leather sheet manufacturing step of manufacturing a leather sheet using the pulverized natural leather waste; and a leather fabric manufacturing step of manufacturing leather fabric by intertwining the leather sheet with the mixed yarn, wherein the mixed yarn manufacturing step includes manufacturing leather fiber cotton using the pulverized natural leather waste. and a leather fiber cotton spinning step of spinning the leather fiber cotton to produce leather yarn, and a multiple mixing step of mixing the leather yarn, spandex yarn, and nylon fiber yarn to produce a mixed yarn, and the multiple mixing step. is a leather manufactured by recycling natural leather waste, in which a mixed yarn is manufactured in which a single or plural leather yarn is placed at the center, and a plurality of spandex yarns and a plurality of nylon fiber yarns intersect in an X-shape to surround the leather yarn. This is achieved by the fabric manufacturing method.

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Additionally, the leather thread may be coated with a silicone composition.

In addition, the leather sheet manufacturing step may include a binder addition step of adding a binder to the pulverized natural leather waste to prepare a mixture, and a mixture processing step of processing the mixture to produce a leather sheet.

According to the present invention, leather fabric can be produced in an environmentally friendly manner and at low cost.

In addition, leather fabric with excellent durability and elasticity and a soft surface texture can be produced.

Meanwhile, the effects of the present invention are not limited to the effects mentioned above, and various effects may be included within the range apparent to those skilled in the art from the contents described below.

Figure 1 shows a flowchart of a method for manufacturing leather fabric using recycled natural leather waste according to an embodiment of the present invention.
Figure 2 shows a flowchart of the steps of manufacturing mixed yarn in the method of manufacturing leather fabric from recycled natural leather waste according to an embodiment of the present invention;
Figure 3 shows a flowchart of the steps for manufacturing a leather sheet in the method of manufacturing leather fabric using recycled natural leather waste according to an embodiment of the present invention;
Figure 4 shows the configuration of mixed yarn in the method of manufacturing leather fabric from recycled natural leather waste according to an embodiment of the present invention;
Figure 5 shows a cross-sectional view of the mixed yarn in the method of manufacturing leather fabric from recycled natural leather waste according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings.

Additionally, in describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

From now on, with reference to the attached drawings, a method for manufacturing leather fabric using recycled natural leather waste according to an embodiment of the present invention will be described in detail.

Figure 1 shows a flowchart of a method for manufacturing leather fabric using recycled natural leather waste according to an embodiment of the present invention, and Figure 2 shows the manufacturing method of leather fabric using recycled natural leather waste according to an embodiment of the present invention. It shows a flowchart of the steps of manufacturing mixed yarn in the method, and Figure 3 shows a flowchart of the steps of manufacturing a leather sheet in the method of manufacturing leather fabric from recycled natural leather waste according to an embodiment of the present invention. 4 shows the configuration of mixed yarn in the method of manufacturing leather fabric by recycling natural leather waste according to an embodiment of the present invention, and Figure 5 shows the composition of natural leather waste according to an embodiment of the present invention. A cross-sectional view of the mixed yarn in the manufacturing method of recycled leather fabric is shown.

As shown in Figure 1, the manufacturing method (S100) of leather fabric using recycled natural leather waste according to an embodiment of the present invention includes a pretreatment step (S110), a grinding step (S120), and a mixed yarn manufacturing step (S130). , including a leather sheet manufacturing step (S140) and/or a leather fabric manufacturing step (S150).

The pretreatment step (S110) is a step of preprocessing natural leather waste. The pretreatment step (S110) may include a washing step in which the collected natural leather waste is rinsed in water to remove impurities, and if necessary, a fatliquor is added to prevent the sticking of leather fibers and add softness and elasticity to the leather. Steps may be included.

The pulverizing step (S120) is a step of pulverizing the pretreated natural leather waste. Grinding is intended to destroy the bonds between leather fibers, and various grinders such as hammer mills and cutting mills can be used for grinding. Through pulverization, natural leather waste is cut to an appropriate size, and the pulverized natural leather waste is used as raw material for manufacturing mixed yarn and leather sheets in the mixed yarn manufacturing step (S130) and leather sheet manufacturing step (S140), which will be described later. It is utilized.

In the mixed yarn manufacturing step (S130), leather yarn (10) is manufactured using pulverized natural leather waste, and mixed yarn is manufactured by mixing leather yarn (10), spandex yarn (20), and fiber yarn (30). It's a step.

As shown in Figure 2, the mixed yarn manufacturing step (S130) includes, in more detail, a leather fiber cotton manufacturing step (S131), a leather fiber cotton spinning step (S132), and/or a multiple mixing step (S133).

The leather fiber cotton manufacturing step (S131) is a step of manufacturing leather fiber cotton using pulverized natural leather waste. Natural leather waste is pulverized through a grinder to expose leather fibers, and these leather fibers can be manufactured in the form of leather fiber cotton through a cotton wool process through a leather cotton machine. The leather fiber cotton spinning step (S132) is a step of manufacturing leather yarn 10 by spinning leather fiber cotton. The leather fiber cotton spinning step (S132) is the step of turning cotton into yarn. In this step, blowing, carding, combing, drawing, roving, and A series of generally known spinning processes, such as spinning, can be performed.

Meanwhile, in addition to the leather fiber floss manufactured through the leather fiber floss manufacturing step (S131), if necessary, artificial fiber floss to improve the strength of the leather thread 10 may be mixed with the leather fiber floss for spinning. Artificial fiber batting may include nylon, acrylic, polyester, polypropylene, linen, etc., but is not limited thereto.

According to the leather fiber cotton spinning step (S132) described above, leather fiber cotton obtained from natural leather waste is converted into the form of leather thread 10, and this leather thread 10 becomes a component necessary for manufacturing mixed yarn. .

The multiple mixing step (S133) is a step of manufacturing mixed yarn by mixing leather yarn (10), spandex yarn (20), and fiber yarn (30). The mixed yarn consists of leather yarn (10), spandex yarn (20), and fiber yarn (30), which are combined according to a certain arrangement to form one yarn.

The spandex yarn 20 surrounds the leather yarn 10 together with the fiber yarn 30, which will be described later, and is a yarn made of elastic fiber with a polyurethane content of 85% or more, and has excellent elasticity and elastic recovery properties and is very hygroscopic. It has the property of being low and unaffected by water.

The fiber yarn 30 surrounds the leather yarn 10 together with the spandex yarn 20, and may include both natural fibers and artificial fibers. The fiber yarn 30 may include nylon, acrylic, polyester, polypropylene, linen, etc., but is not limited thereto.

The fiber yarn 30 is included as a component of the mixed yarn to improve the specific performance of the mixed yarn. For example, artificial fibers such as nylon and polyester can be used as fiber yarn 30. Nylon and polyester have strong durability and elasticity, and are fibers with excellent straightness. When these are used as fiber yarns (30), the straightness of the mixed yarn can be improved.

As shown in Figures 4 and 5, a mixed yarn is manufactured by combining spandex yarn 20, fiber yarn 30, and leather yarn 10 obtained from natural leather waste according to a certain arrangement.

As shown in Figure 4, at the center of the mixed yarn, a single or a plurality of leather yarns 10 are arranged as a core yarn at the center, and a plurality of spandex yarns 20 are placed around the leather yarn 10 as the center. and a plurality of fiber yarns 30 are arranged to surround the leather yarn 10 while crossing each other in an X shape. By placing the leather thread 10 at the center of the mixed yarn, the leather thread 10 is blocked from contact with the outside by the surrounding spandex thread 20 and the fiber thread 30, preventing damage and damage to the leather that may occur due to friction. The generation of dust due to contact between the yarns (10) can be reduced.

As shown in FIG. 5, the plurality of spandex yarns 20 and the plurality of fiber yarns 30 can be arranged in various ways. For example, one strand of spandex yarn 20 and one strand of fiber yarn 30 may be arranged in a way that they intersect, and two strands of spandex yarn 20 are arranged continuously between the fiber yarns 30. It may be arranged, or conversely, it may be arranged in such a way that two strands of the fiber yarns 30 are continuously arranged between the spandex yarns 20. The arrangement method is not limited to this and can be varied to suit the purpose. For example, when manufacturing a mixed yarn by combining spandex yarn (20) and nylon fiber yarn (30), if the ratio of spandex yarn (20) increases, mixed yarn with excellent elasticity can be manufactured, and nylon fiber yarn (30) ) As the ratio increases, blended yarn with excellent durability and straightness can be manufactured.

Meanwhile, the leather thread 10 constituting the core of the mixed yarn may be coated with a silicone composition. Silicone compositions can be prepared by blending silicone and polyurethane. Silicone, which has excellent stain resistance and elasticity, can compensate for the insufficient elasticity of the leather thread 10, and polyurethane, which has strong adhesiveness, can help the coating agent and the leather thread 10 adhere well.

Additionally, the silicone composition may further include fluorocarbon. Fluorocarbon can improve the durability and anti-fouling properties of fibers by imparting resistance to the fiber surface and preventing the adhesion of contaminants.

According to the above-mentioned mixed yarn manufacturing step (S130), mixed yarn with excellent durability and elasticity and excellent straightness can be manufactured. In other words, the shortcomings of the leather yarn 10 can be compensated for by the spandex yarn 20 and the fiber yarn 30.

Previously pulverized natural leather waste is used not only in the manufacture of mixed yarn but also in the manufacture of leather sheets.

The leather sheet manufacturing step (S140) is a step of manufacturing leather sheets using pulverized natural leather waste. As shown in Figure 3, the leather sheet manufacturing step (S140) includes, in more detail, a binder addition step (S141) and a mixture processing step (S142).

The binder addition step (S141) is a step of preparing a mixture by mixing a binder with pulverized natural leather waste. It is desirable to allow the mixture made by adding a binder to pulverized natural leather waste to be mixed for more than 1 hour.

As a binder, rubber latex such as SBR (styrene butadiene rubber) latex, NR (natural rubber) latex, CR (chloroprene) latex, and NBR (nitrile butadiene rubber) latex can be used, and polyurethane emulsion, acrylic emulsion, and ethylene vinyl acetate can be used. Emulsions such as emulsion may be used. Rubber latex helps improve the flexibility of leather fibers, and emulsion helps improve mechanical strength. Therefore, it is desirable to use a binder that is an appropriate mixture of rubber latex and emulsion.

According to the above-described binder addition step (S141), the pulverized natural leather waste is evenly dispersed and the bonding strength is improved.

The mixture processing step (S142) is a step of manufacturing leather sheets by processing the mixture generated through the mixing step. The mixture processing step (S142) may generally include a dehydration process, a drying process, a compression process, and a heat treatment process. The mixture goes through a dehydration process and a drying process, through which the moisture contained in the mixture is removed. Afterwards, the mixture undergoes a pressing process or a heat treatment process, and an additional drying process may be performed if necessary. Each process can be added or removed as needed.

Through this process, leather seats are finally manufactured, and the leather seats can be cut to fit the purpose.

The mixed yarn manufactured through the above-described mixed yarn manufacturing step (S130) and the leather sheet manufactured through the leather sheet manufacturing step (S140) go through the leather fabric manufacturing step (S150) described later to become the final leather fabric.

The leather fabric manufacturing step (S150) is a step in which leather fabric is manufactured by entangling mixed yarn and leather sheets. First, the mixed yarn is laminated on the leather seat. The mixed yarn may be laminated in the form of a mesh or in the form of multiple layers. Afterwards, a process of intertwining the laminated mixed yarn and leather sheet is performed, and a spunlace process or needle punching process may be used in this process.

The spunlace process is a method of weaving fibers by spraying high-pressure water on the surface. This process is mainly used to produce fabrics with a soft texture. The needle punching process is a method of weaving fibers using needles, and this process is mainly used to produce fabrics that require strong durability. An appropriate process can be selected and used depending on the target fabric, and other known bridging processes can be used as needed.

According to the leather fabric manufacturing step (S150) described above, the leather fabric manufactured by intertwining the mixed yarn and the leather sheet has excellent durability and elasticity, and has the effect of softening the surface texture.

The work of the present invention includes the pretreatment step (S110), grinding step (S120), mixed yarn manufacturing step (S130), leather sheet manufacturing step (S140), and leather fabric manufacturing step (S150) as described above. According to the manufacturing method (S100) of leather fabric using recycled natural leather waste according to the embodiment, leather fabric can be produced in an environmentally friendly manner and at a low cost.

Additionally, according to the present invention, a leather fabric with excellent durability and elasticity and a soft surface texture can be produced.

Example 1

In order to coat leather threads, a silicone composition with a weight ratio of silicone, polyurethane, and fluorocarbon of 2:1:1 was prepared, and leather threads were coated using this. Afterwards, the coated leather thread is placed on the core, and spandex yarn is placed at the 3 o'clock, 6 o'clock, 9 o'clock, and 12 o'clock directions of the core, and two strands of nylon fiber yarn are placed between the spandex yarns and mixed. Yarn was manufactured. In addition, leather sheets were manufactured using a binder mixed with SBR latex and polyurethane emulsion at a weight ratio of 1:1. Afterwards, mixed yarns were laminated on the leather sheet in the form of a mesh and were entangled through a needle punching process to produce leather fabric.

Comparative Example 1

When manufacturing the mixed yarn in Example 1, the mixed yarn was manufactured using leather yarn not coated with a silicone composition, and other than that, leather fabric was manufactured through the same process under the same conditions as in Example 1.

Comparative Example 2

When preparing the coating composition in Example 1, the coating composition was prepared with a weight ratio of silicone and polyurethane of 2:1, except for the fluorocarbon. Other than that, the leather was prepared through the same process under the same conditions as in Example 1. Fabric was manufactured.

Comparative Example 3

When preparing the coating composition in Example 1, the coating composition was prepared by setting the weight ratio of fluorocarbon and polyurethane to 2:1, except for silicone. Other than that, the leather was prepared through the same process under the same conditions as in Example 1. Fabric was manufactured.

Comparative Example 4

In Example 1, single leather yarn, not mixed yarn, was used, and other than that, leather fabric was manufactured through the same process under the same conditions as Example 1.

Comparative Example 5

When manufacturing the mixed yarn in Example 1, the mixed yarn was manufactured by arranging spandex yarns and nylon fiber yarns alternating around the leather yarn as the core, and other than that, leather fabric was manufactured through the same process under the same conditions as in Example 1. .

Comparative Example 6

When manufacturing the mixed yarn in Example 1, nylon fiber yarns were placed at the 3 o'clock, 6 o'clock, 9 o'clock, and 12 o'clock directions of the core, and two strands of spandex yarn were placed between the nylon fiber yarns to make the mixed yarn. A leather fabric was manufactured through the same process under the same conditions as in Example 1.

Experiment example

1. Durability (wear resistance) test

The Martindale abrasion test was performed on leather fabrics made by the methods of Examples and Comparative Examples, and durability (abrasion resistance) was measured by observing changes due to wear.

2. Antifouling test

The leather fabric made by the method of Examples and Comparative Examples was completely submerged in a container containing water, and the change in weight of the leather fabric according to the absorption time was recorded to measure stain resistance.

3. Elasticity test

The leather fabric made by the method of Examples and Comparative Examples was fixed to a Tensile Test equipment and the amount of stretching was measured while applying force.

4. Linearity experiment

After fixing the leather fabric made by the method of Examples and Comparative Examples, the degree of bending or bending was measured by applying a certain force.

The physical properties of leather fabrics manufactured by the methods of Example 1 and Comparative Examples 1 to 6 were compared, and the results were derived as shown in Table 1 below. (◎: Very good, ○: Good, △: Average, X: Bad)

division Durability (wear resistance) antifouling Flexibility linearity Example 1 ◎ ◎ △ ◎ Comparative Example 1 △ △ △ ◎ Comparative Example 2 △ ○ ○ ◎ Comparative Example 3 ○ ○ △ ◎ Comparative Example 4 △ △ X X Comparative Example 5 ○ ○ ○ △ Comparative Example 6 ○ ○ ◎ X

Comparing the results of Comparative Examples 1 to 3, when the leather thread was coated using a coating agent with a high silicon content excluding fluorocarbon, the anti-fouling property was improved and the elasticity was particularly improved. When leather thread was coated with a coating agent with a high fluorocarbon content, excellent performance was improved in terms of durability and anti-fouling properties.

In addition, comparing the results of Comparative Examples 4 to 6, when manufacturing mixed yarns, the higher the ratio of spandex yarns, the higher the elasticity, but the linearity is reduced, and the higher the ratio of nylon fiber yarns, the higher the linearity, but the elasticity is reduced. There is an inverse relationship. showed the results.

Comparative Example 4 was a case where coated single leather thread was used instead of mixed thread, and overall performance was found to be poor. In particular, due to the absence of nylon fiber threads, poor results were seen in terms of straightness, and the coating peeled off due to the coating portion being directly exposed to the outside, resulting in dust from the leather thread. In the case of Comparative Example 5, spandex yarns and nylon fiber yarns were arranged alternatingly to form a mixed yarn at a 1:1 ratio, which showed overall balanced performance improvement, but was somewhat lacking in linearity to produce the target product. appear. In the case of Comparative Example 6, the mixed yarn was composed so that the ratio of spandex yarn was higher than that of nylon fiber yarn, and although it showed very good elasticity, the straightness was very poor. In addition, when the leather fabric was stretched due to strong elasticity, the outer surface of the screening furnace was damaged. It was found that the inflow rate of foreign substances was high.

Therefore, in general, it is desirable to configure the mixed yarn as in Example 1 so that a leather fabric can be manufactured that is excellent in durability, stain resistance, and straightness, and ensures appropriate elasticity, but is not limited to this and is not limited to this. The composition of the mixed yarn can be varied depending on the characteristics.

In addition, terms such as “include,” “comprise,” or “have” described above mean that the corresponding component may be present, unless specifically stated to the contrary, and therefore do not exclude other components. Rather, it should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless clearly defined in the present invention.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

S100: Method for manufacturing leather fabric by recycling natural leather waste according to an embodiment of the present invention
S110: Preprocessing step
S120: Grinding step
S130: Mixed yarn manufacturing stage
S131: Leather fiber cotton manufacturing step
S132: Leather fiber cotton spinning step
S133: Multiple mixing steps
S140: Leather seat manufacturing stage
S141: Binder addition step
S142: Mixture processing step
S150: Leather fabric manufacturing stage
10: leather thread
20: Spandex yarn

Claims (5)

A pretreatment step of preprocessing natural leather waste;
A pulverizing step of pulverizing the pretreated natural leather waste;
A mixed yarn manufacturing step of manufacturing leather yarn using the pulverized natural leather waste and manufacturing mixed yarn using the leather yarn, spandex yarn, and nylon fiber yarn;
A leather sheet manufacturing step of manufacturing a leather sheet using the pulverized natural leather waste; and
It includes a leather fabric manufacturing step of manufacturing leather fabric by entangling the leather sheet with the mixed yarn,
The mixed yarn manufacturing step is,
A leather fiber cotton manufacturing step of manufacturing leather fiber cotton using the pulverized natural leather waste;
A leather fiber cotton spinning step of spinning the leather fiber cotton to produce leather yarn,
It includes a multiple mixing step of producing a mixed yarn by mixing the leather yarn, spandex yarn, and nylon fiber yarn,
The multiple mixing step is,
A leather fabric made from recycled natural leather waste, in which a mixed yarn is manufactured in which a single or plural leather yarn is placed at the center, and a plurality of spandex yarns and a plurality of nylon fiber yarns intersect in an X shape to surround the leather yarn. Manufacturing method. delete delete In claim 1,
The leather goods,
A method of manufacturing leather fabric recycled from natural leather waste, characterized in that it is coated with a silicone composition. In claim 1,
The leather sheet manufacturing step is,
A binder addition step of preparing a mixture by adding a binder to the pulverized natural leather waste;
A method of manufacturing leather fabric from recycled natural leather waste, comprising a mixture processing step of processing the mixture to produce a leather sheet.