KR102618959B1 - Method for manufacturing of eco frendly recycle leather wall paper - Google Patents

Abstract

The method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention includes the steps of preparing a mixture by mixing cowhide staple fibers and polyester staple fibers, opening the mixture and entangling it with a water jet, and drying the entangled fabric. Step, producing a recycled leather fabric by pressing the mixture at 80 to 150°C, dipping the recycled leather fabric in a reducing agent solution and drying it, washing and drying the recycled leather fabric, applying a pressure of 150 to 150 degrees Celsius to the recycled leather fabric. It may include a pattern forming step of forming a pattern by applying pressure at 250°C and a step of coating a silicone resin on the surface of the recycled leather fabric.

Description

Method of manufacturing eco-friendly recycled leather wallpaper{METHOD FOR MANUFACTURING OF ECO FRENDLY RECYCLE LEATHER WALL PAPER}

The present invention relates to a method of manufacturing eco-friendly recycled leather wallpaper.

In general, the leather processing process first removes dirt and hair from the raw hide through water and lime needles. The splitting process, also known as splitting, is a process that divides pelt that has gone through lime needles into the desired thickness. The tanning process uses chromium to denature animal proteins into mineral proteins. In these processes, rough cowhide is wrung out so that the moisture content is 50 to 60%, and then the thickness is adjusted according to the grade. Additionally, the thickness-adjusted fabric goes through dyeing, drying, milling, and embossing to create the final leather fabric.

During the leather manufacturing process, especially during the process of controlling the thickness of leather, saving powder or scrap, which is solid waste, is inevitably generated. The method of manufacturing recycled leather by recycling such saving pieces or scraps is widely known, and is usually used as interior materials for automobiles, interior decoration, etc.

Korean Registration No. 10-0815634 discloses a method for manufacturing recycled leather sheets, including the steps of processing the saving pieces into natural rubber or latex, mixing them with waterproofing and flame retardants, coagulating them, and manufacturing the sheets by pressing them. It is done. The Korean patent in question is based on a wet method of micronizing leather waste and simply mixing latex, an adhesive material, to bond it. The tensile and tear strengths are very weak, and the use of excessive chemicals causes secondary pollution and environmental problems. occurs, and due to the tanning process that uses chromium when manufacturing cowhide, a significant amount of chromium remains in cowhide powder.

Accordingly, when wallpaper is manufactured using such leather, harmful substances are emitted, which causes a problem in that the residential environment in the place where the wallpaper is installed becomes poor.

It was developed based on the above technical background, and provides an eco-friendly recycled leather wallpaper manufacturing method that can be eco-friendly by using natural leather materials and minimizing the use of chemicals, and prevents the patterns formed on the surface from being worn away. can do.

In the method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention, the step of preparing a mixture by mixing cowhide staple fibers and polyester staple fibers, opening the mixture and entangling it with a water jet, and drying the entangled fabric. A step of producing a recycled leather fabric by pressing the mixture under conditions of 80 to 150° C., a step of immersing the recycled leather fabric in a reducing agent solution and drying it, a step of washing and drying the recycled leather fabric, It may include a pattern forming step of forming a pattern by applying pressure under conditions of 150 to 250° C. and a step of coating a water-soluble resin on the surface of the recycled leather fabric.

In the step of preparing the mixture, the weight ratio of cowhide staple fibers and polyester staple fibers may be 95 to 70:5 to 30.

The step of manufacturing recycled leather fabric may further include a mixing step of adding and mixing a water-based adhesive to the mixture.

In the mixing step of adding and mixing the water-based adhesive, the mixture to which the water-based adhesive has been added can be compressed to a thickness of 1/2 to 3/5 of the thickness of the mixture at a temperature higher than room temperature.

The pattern formation step includes forming a print layer by printing a pattern on a transfer paper, bringing the print layer into contact with the surface of the recycled leather fabric, and heating and pressurizing the transfer paper to transfer the print layer onto the recycled leather fabric by sublimation. It can be included.

Additionally, the pattern forming step may include preparing a roller on which an embossed or engraved pattern is formed, heating the roller, and press-fitting the surface of the recycled leather fabric with the heated roller.

The method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention can provide eco-friendly recycled leather with excellent rigidity and elasticity by using polyester fibers with excellent durability and elasticity in cowhide staple fibers.

In addition, by forming a pattern on eco-friendly recycled leather and coating it with silicone, contamination resistance is increased and the pattern can be prevented from being worn.

Figure 1 is a flowchart of a method for manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention.
Figure 2 is a first flow chart of the pattern forming step in the eco-friendly recycled leather wallpaper manufacturing method according to an embodiment of the present invention.
Figure 3 is a second flowchart of the pattern forming step in the eco-friendly recycled leather wallpaper manufacturing method according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted, and identical or similar components are given the same reference numerals throughout the specification.

In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” another part, this includes not only cases where it is “directly above” the other part, but also cases where there is another part in between. Conversely, when a part of a layer, membrane, region, plate, etc. is said to be “beneath” another part, this includes not only cases where it is “immediately below” another part, but also cases where there is another part in between.

Figure 1 is a flowchart of a method for manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention.

Referring to Figure 1, the method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention includes the steps of mixing cowhide staple fibers and polyester staple fibers to prepare a mixture (S100), opening the mixture, and entangling it with a water jet. Step (S200), drying the entangled fabric (S300), manufacturing recycled leather fabric by pressing the mixture at 80 to 150 ° C. (S400), dipping the recycled leather fabric in a reducing agent solution and drying it. (S500), a step of washing and drying the recycled leather fabric (S600), a pattern forming step of forming a pattern by applying pressure at 150 to 250 ° C. (S700), a step of coating the surface of the recycled leather fabric with a water-soluble resin ( S800) may be included.

First, it may include preparing a mixture by mixing cowhide short fibers and polyester short fibers (S100). At this time, cowhide short fibers can be formed by pulverizing and beating cowhide powder, pieces, by-products, or waste to expose microfibers. For example, cowhide staple fibers can be obtained by beating for about 60 to 120 minutes.

The polyester staple fiber may be polyethylene terephthalate (PET) fiber.

Hereinafter, the correlation between physical properties according to the mixing ratio of recycled leather fabric fibers will be described in more detail through Examples 1 to 6 of the present invention.

The recycled leather fabrics of Examples 1 to 6 were made by mixing cowhide staple fibers and polyester staple fibers according to the weight ratio shown in Table 1, adding a water-based adhesive, and pressing them at a pressure of 95 to 105 bar at 90 to 100 ° C. Afterwards, the physical properties were compared.

In addition, moisture permeability was evaluated according to KS M 6886, flexibility was evaluated according to KS M ISO 17235, and tear strength was evaluated according to KS M 6882, and the measured values are listed in Table 1.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 mixing ratio
(weight ratio) Cowhide
short fiber 99 90 80 70 60 50 polyester
short fiber One 10 20 30 40 50 moisture permeability
(g/㎡/24h) 3,570 3,552 3,450 3,350 3,208 3,050 Flexibility (mm) 4.5 4.3 4.1 3.9 3.2 2.2 Tear strength
(kgf/㎜) 4.8 5 5.3 5.5 5.8 6.3

Referring to Table 1, as the mixing ratio of polyester short fibers increases, the tear strength increases.

It was confirmed that it was increasing. Through this, it is possible to manufacture a more durable recycled leather fabric, but it is measured to be relatively less flexible, so the softness of the fabric may be reduced. In addition, it can be seen that the higher the mixing ratio of polyester short fibers, the lower the moisture permeability, which can be judged to be because polyester itself has low moisture absorption and moisture permeability, making it vulnerable to moisture release.

Therefore, in order to have a relatively soft surface, good durability, and appropriate moisture permeability, the weight ratio of cowhide staple fibers and polyester staple fibers is 99 to 70:1 to 30, preferably 95 to 70:5 to 30. Can be mixed.

After the step of preparing a mixture by mixing cowhide short fibers and polyester short fibers (S100), a mixing step of adding and mixing a water-based adhesive to the mixture (S110) may be further included.

Accordingly, the mixture of water-based adhesive, cowhide staple fibers, and polyester staple fibers may have a predetermined thickness. For example, the thickness of the mixture may be 0.4 to 0.5 cm.

After the mixing step (S110) of adding and mixing the water-based adhesive to the mixture, a step (S120) of carding the mixture may be further included.

Carding is a process of removing impurities that still remain after the twisting and arranging process, arranging the tangled fibers, and arranging them in parallel to form slivers.

A carding machine can be used, or a rotating roller aligned horizontally or a cylinder covered with pins can be used. The rollers are oriented in the same direction, but some rollers or cylinders can rotate in different directions, some clockwise and some counterclockwise. Additionally, they may rotate at different speeds, and some may rotate at the same speed (rpm). There may also be differences in diameter size, and these differences allow the fibers to untangle and even out as they pass through the carding machine, and to remove impurities.

After the step of preparing the mixture (S100), a step of opening the mixture and entangling it with a water jet (S200) may be included.

For example, by spraying a high-pressure water stream of 60 kg/cm2G or more onto the fiber using a water jet, the cowhide single fibers can be compressed between the leather threads in the fabric by the water pressure and firmly bonded.

By water punching the fibers, bonding strength can be strengthened, high-pressure water can be continuously passed through the fiber layer to form fabric, and the density of each fiber in the fiber layer and bonding strength between fibers can be increased. Because it has the characteristic of completing the bonding of fibers using water instead of conventional chemical adhesives or organic compounds containing chemical additives, it can be said to be an eco-friendly method.

The manufacturing method of recycled leather wallpaper according to an embodiment of the present invention is that when spraying fibers with a water jet at a pressure of less than 60 kg/cm2G, bonding between fibers does not occur normally, so the tearing strength may be reduced and easily damaged. can be separated.

In addition, by controlling the number of water punching, the strength of the fiber layer is increased, and the punched fabric can form a fine network structure at equal intervals.

Therefore, since the eco-friendly recycled leather wallpaper according to an embodiment of the present invention is entangled using a high-pressure water flow of 60 kg/cm2G or more by waterjet, it can have a lighter and softer touch.

After the step of entangling with a water jet (S200), a step of drying the entangled fabric (S300) may be included.

It is desirable to naturally dry the entangled fabric at room temperature conditions of 5 to 30°C in a place protected from ultraviolet rays. When ultraviolet rays are irradiated to the entangled fabric, shrinkage of the fibers may occur, and drying below 5°C may reduce the efficiency of the entire process due to the slow evaporation rate. Additionally, above 30°C, the drying speed may be relatively fast, but the arrangement of the fibers may be distorted as water evaporates at a rapid rate.

After the step of drying the entangled fabric (S300), a step of producing a recycled leather fabric by pressing the mixture (S400) may be included.

At this time, recycled leather fabric can be manufactured by compressing a mixture of water-based adhesive, cowhide staple fibers, and polyester staple fibers at a temperature higher than room temperature. For example, recycled leather fabric can be manufactured by compressing the mixture in a press set to a temperature of 80 to 150°C.

Hereinafter, through Examples 7 to 12 of the present invention, the correlation between the thickness of the recycled leather fabric according to the pressing temperature and the occurrence of holes and carbonization in the recycled leather fabric will be described in more detail.

The recycled leather fabrics of Examples 7 to 12 were prepared by mixing 70 wt% of cowhide staple fibers, 30 wt% of polyester staple fibers, and a water-based adhesive to prepare a mixture with a thickness of 0.4 cm, and then fabricated under the temperature conditions shown in Table 2 below. It was manufactured by compression.

division Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Compression temperature (℃) 70 78 80 120 150 152 Recycled leather fabric thickness (cm) 0.4 0.35 0.3 0.25 0.2 0.195 Recycled leather fabric
Whether a hole occurs O O X X X X Carbonization of recycled leather fabric X X X X X O

Referring to the results of Examples 9 to 11 in Table 2, when the mixture is pressed through a press at a temperature of 80 to 150 ° C. for a predetermined time, the thickness of the manufactured recycled leather fabric is within the range of 0.2 to 0.3 cm. It was confirmed that it was formed in a thickness range of 1/2 to 3/5 of the mixture thickness. In addition, it was confirmed that no holes or carbonization occurred in the manufactured recycled leather fabric.

Holes are created on the surface of the recycled leather fabric when the mixture is not sufficiently compressed and pores remain. If holes are formed unbalanced on the surface, problems such as the surface not being smooth, properties being deteriorated, and mechanical strength being weakened due to the occurrence of voids may occur.

In addition, carbonization refers to the process of turning organic materials into a black material containing a lot of carbon when heated and blocked from the flow of air or oxygen. In general, when harsh conditions are established where the heating temperature becomes higher than necessary, the material inside the fiber is charred black, the leather surface is damaged, and high-quality leather cannot be manufactured.

Accordingly, the occurrence of holes and carbonization is considered an important determining factor in the manufacturing method of recycled leather fabric in order to achieve effects such as excellent surface feel, visually beautiful condition, and durability of recycled leather fabric.

Therefore, in the method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention, the pressing temperature in the step (S400) of producing recycled leather fabric by pressing the mixture may preferably be 80 to 150 ° C.

Additionally, in the method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention, recycled leather fabric can be manufactured by pressing the mixture to a thickness of 1/2 to 3/5 of the thickness. For example, the thickness of the recycled leather fabric manufactured by pressing may be 0.2 to 0.3 cm.

According to Examples 7 to 8 in Table 2 where the pressing temperature was less than 80°C, the thickness of the manufactured recycled leather fabrics all exceeded 0.3 cm. It was determined that this was because the mixture was not sufficiently pressed when the pressing temperature was less than 80°C. In addition, according to Examples 1 and 2, holes were generated in the recycled leather fabric after the compression was completed. As a result, temperatures below 80°C are not desirable temperature conditions for compression because the compression is not sufficiently performed and holes are generated. could be confirmed.

Additionally, referring to Example 12 in which the pressing temperature was 150°C or higher, it was confirmed that the thickness of the manufactured recycled leather fabric was less than 0.2 cm. This can be judged to be because excessive compression of the mixture occurs when the compression temperature is 150°C or higher. In addition, when the pressing temperature was 150 ℃ or higher, it was confirmed that carbonization occurred in the recycled leather fabric due to high temperature heat. Through this, it was determined that even when the pressing temperature was 150 ℃ or higher, it was not a desirable temperature condition.

After the step of compressing the mixture to produce a recycled leather fabric (S400), a step of immersing the recycled leather fabric in a reducing agent solution and then drying it (S500) may be included.

For example, calcium carbonate, lithium carbonate, and sodium bisulfite can be used as the reducing agent, and sodium bisulfite is preferably used. Additionally, sodium bisulfite with a solid content of 10% or less can be used.

When recycled leather fabric is immersed in a reducing agent aqueous solution, the reducing agent reacts more quickly with hexavalent chromium and can be converted to trivalent chromium.

In addition, the recycled leather fabric can be immersed in a reducing agent solution and the excess impregnated reducing agent can be squeezed out by applying a certain pressure while winding or moving the fabric through a roller. Through this, it is possible to prevent the reducing agent from remaining on the surface of the recycled leather fabric more than necessary in the next process.

After immersing the recycled leather fabric in a reducing agent solution and drying it (S500), it may include washing and drying the recycled leather fabric (S600). At this time, after separating the recycled leather fabric from the aqueous reducing agent solution, the recycled leather fabric can be washed with water, mixed with the washing water and the aqueous reducing agent solution, and then discharged to the outside.

Additionally, moisture can be removed by applying heat to the washed recycled leather fabric. For example, the fabric can be dried by removing a certain amount of moisture through dehydration before applying heat and then passing it along a rail through a drying room with an internal temperature set to a high temperature. Specifically, moisture can be removed by allowing the fabric to move along rails in a drying room set to an internal temperature of 80 to 200°C.

Accordingly, conversion of the remaining trivalent chromium ions into hexavalent chromium ions can be suppressed and removed when the recycled leather fabric is impregnated with the reducing agent aqueous solution, and since the dry process is used, chemical products may not be used.

Figure 2 is a first flowchart of the pattern forming step in the eco-friendly recycled leather wallpaper manufacturing method according to an embodiment of the present invention.

Referring to Figure 2, the pattern forming step (S700) according to an embodiment of the present invention includes forming a print layer by printing a pattern on transfer paper (S710), and contacting the print layer with the surface of the recycled leather fabric (S710). It may include a step (S720) and sublimation transfer of the printing layer to the recycled leather fabric (S730).

First, it may include the step of printing a pattern on transfer paper to form a printing layer (S710). For example, the design to be printed can be printed on transfer paper using leather printing ink.

After forming the print layer (S710), a step (S720) of bringing the print layer into contact with the surface of the recycled leather fabric may be included.

In addition, after the step of contacting the print layer with the surface of the recycled leather fabric (S720), a step of sublimation transfer of the print layer to the surface of the recycled leather fabric by applying heat and pressure on the transfer paper (S730) may be included. For example, the transfer paper can be pressed at a predetermined temperature using a press machine.

At this time, in the above-described step of manufacturing the recycled leather fabric (S400), the pressing temperature of the transfer paper can be selected by applying the correction value according to an embodiment of the present invention.

Criteria for applying correction values correction value When compressed to less than 1/2 of the mixture thickness 1.5 When compressing to 1/2 of the mixture thickness 1.2 When compressing more than 1/2 of the mixture thickness One (Temperature produced by pressing the mixture)

Referring to Table 3, in the method of manufacturing eco-friendly recycled leather wallpaper according to an embodiment of the present invention, when the mixture is compressed to less than 1/2 of the thickness in the step (S400) of compressing the mixture to produce recycled leather fabric, You can set the pressing temperature of the transfer paper by applying a correction value of 1.5.

For example, in the step of manufacturing recycled leather fabric by pressing the mixture (S400), if the temperature condition for manufacturing recycled leather fabric by pressing 1/2 of the thickness of the mixture was 130 ℃, multiply the corresponding correction value by 1.2. , the compression of the transfer paper can be set to a temperature condition of 156°C to proceed with the sublimation transfer step (S730) on the surface of the recycled leather fabric.

Just as the pressed thickness of the recycled leather fabric is determined through the pressing temperature under the same conditions, the temperature setting in the sublimation transfer step (S730) to the surface can be changed through the pressed thickness of the recycled leather fabric.

If the compression is not sufficiently performed in the step of manufacturing the recycled leather fabric by pressing the mixture (S400), there is a high possibility that holes will be unbalanced on the surface, which may weaken the mechanical strength. Therefore, in the step of manufacturing recycled leather fabric (S400), the thicker the pressed thickness, the more weight is added to set the correction value, and the correction value is set to be manufactured by heating and pressing to the temperature to which the correction value is applied. You can.

For example, sublimation transfer can be performed in a temperature range of 150 to 250°C using a press machine.

However, if the sublimation transfer temperature is set to 250°C or higher by applying the correction value, the sublimation transfer temperature condition can be set within 250°C and performed. If sublimation transfer is performed under temperature conditions above 250℃, carbonization of the surface of the recycled leather fabric may occur, and the leather surface may be damaged, making it impossible to manufacture high-quality leather.

Therefore, the transfer paper can be pressed at a temperature that is 1.2 to 1.5 times the temperature performed in the step (S400) of manufacturing the recycled leather fabric described above, but the sublimation transfer can be performed by setting the maximum temperature set not to exceed 250 ° C. .

Figure 3 is a second flowchart of the pattern forming step in the eco-friendly recycled leather wallpaper manufacturing method according to an embodiment of the present invention.

Referring to Figure 3, the pattern forming step (S700) according to another embodiment of the present invention includes preparing a roller on which a pattern is formed (S740), heating the roller (S750), and pressing the surface of the recycled leather fabric. (S760) may be included.

First, it may include preparing a roller on which an embossed or engraved pattern is formed (S740). For example, a raised pattern can be formed by forming protrusions on the surface of the roller, or a negative pattern can be formed by etching or laser cutting the surface of the roller.

After preparing the roller (S740), a step of heating the roller on which the pattern is formed (S750) may be included. For example, the roller is heated to a temperature that is 1.2 to 1.5 times the temperature performed in the step (S400) of manufacturing the recycled leather fabric described above. Preferably, the temperature of the roller may be 150 to 250° C.

After the step of heating the roller (S750), a step of pressing the surface of the recycled leather fabric through the heated roller (S760) may be included. Accordingly, a pattern is formed on the surface of the recycled leather fabric, which may correspond to the pattern of the roller.

For example, when a recycled leather fabric is press-fitted with a roller having an embossed pattern, an engraved pattern may be formed on the surface of the recycled leather fabric. When the recycled leather fabric is press-fitted with a roller having an engraved pattern, an embossed pattern may be formed on the surface of the recycled leather fabric.

Meanwhile, as shown in FIG. 1, the step of coating a water-soluble resin on the recycled leather fabric on which a pattern has been formed through the pattern forming step (S700) may be further included (S800).

The water-soluble resin can be liquid silicone rubber (LSR). Specifically, the liquid silicone rubber may be condensation type liquid silicone rubber or addition type liquid silicone rubber. This silicone resin can be applied to a thickness of 2 to 50 ㎛ on the surface of the recycled leather fabric and cured. Accordingly, coating the surface of the recycled leather fabric with silicone not only increases stain resistance but also prevents pattern wear.

Additionally, a mixture containing 100 to 400 parts by weight of water based on 30 to 40 parts by weight of water-soluble polyurethane can be coated on the surface of the recycled leather fabric.

Water-based polyurethane is a type of polyurethane particles swollen and dispersed with water. It is as durable as oil-based polyurethane, dries quickly, and has a low odor. Once the polyurethane is coated, the water evaporates, leaving only the urethane on the surface of the recycled leather fabric, forming a transparent film.

Through this, water-based polyurethane coating prevents surface scratches and makes it possible to manufacture highly durable recycled leather wallpaper.

After the step of coating the water-soluble resin on the recycled leather fabric (S800), a step of drying the coated recycled leather fabric (S810) may be further included.

Specifically, recycled leather fabric coated with water-soluble resin can be dried under conditions of 80 to 150°C. When drying below 80 ℃, the drying time may be prolonged, which may reduce the efficiency of the process, and when drying above 150 ℃, a temperature higher than necessary is applied during drying, which may cause deformation of the water-soluble resin or fabric.

In this way, through the eco-friendly recycled leather wallpaper manufacturing method of the present invention, it is possible to not only provide wallpaper made of eco-friendly recycled leather with excellent rigidity and elasticity by using polyester fibers with excellent durability and elasticity in cowhide staple fibers, but also to provide recycled leather. By forming a pattern on the leather and coating it with a water-soluble resin, not only does the stain resistance increase, but the pattern can be prevented from being worn away.

Although the embodiments of the present invention have been described above, the spirit of the present invention is not limited to the embodiments presented in the present specification, and those skilled in the art who understand the spirit of the present invention will understand the spirit of the present invention within the scope of the same spirit, including addition of components, Other embodiments can be easily proposed by changes, deletions, additions, etc., but this will also be said to fall within the scope of the present invention.

Claims (6)

The tear strength is 5 ~ 5.5 kgf/mm, and the moisture permeability is 3,350 ~ 3,552 (g/ ) 24h, preparing a mixture by mixing cowhide staple fibers and polyester staple fibers at a weight ratio of 95 to 70: 5 to 30 to have flexibility, a relatively soft surface, good durability, and appropriate moisture permeability;
Opening the mixture, controlling the number of water punching operations, and agitating the mixture using a high-pressure water flow of 60 kg/cm ² G or more using a water jet;
Naturally drying the entangled fabric at 5 to 30° C.;
The thickness of the recycled leather fabric is 0.2 to 0.3 cm, and it is formed to a thickness of 1/2 to 3/5 of the thickness of the mixture, and the mixture is pressed at 80 to 150 ℃ to prevent carbonization and holes in the recycled leather fabric. and the temperature at which the mixture is manufactured by compressing it by applying the correction value application standard according to the thickness of the mixture being compressed. Manufacturing a recycled leather fabric by selecting a pressing temperature based on a correction value;
Dipping the recycled leather fabric in a reducing agent solution and then drying it;
Washing and drying the recycled leather fabric;
A pattern forming step of forming a pattern by applying pressure to the recycled leather fabric at a temperature of 150 to 250°C; and
Comprising the step of coating a water-soluble resin on the surface of the recycled leather fabric,
The pattern formation step is,
Forming a printing layer by printing a pattern on transfer paper;
Contacting the surface of the printed layer and the recycled leather fabric; and
Applying a correction value according to the mixture thickness standard, heating and pressurizing the transfer paper, and sublimating and transferring the print layer to the recycled leather fabric,
The criteria for applying the above correction values are,
Correction value 1.5 when compressed to less than 1/2 of the mixture thickness;
1.2 when compressed to 1/2 the thickness of the mixture; and
A method of manufacturing eco-friendly recycled leather wallpaper selected from any one of 1 in the case of pressing to more than 1/2 of the thickness of the mixture. According to claim 1,
The step of manufacturing the recycled leather fabric is,
A method of producing eco-friendly recycled leather wallpaper, further comprising a mixing step of adding and mixing a water-based adhesive to the mixture. According to clause 2,
The mixing step of adding and mixing the water-based adhesive is,
A method of manufacturing eco-friendly recycled leather wallpaper in which the mixture to which the water-based adhesive is added is pressed to a thickness of 1/2 to 3/5 of the thickness of the mixture at a temperature higher than room temperature. delete According to claim 1,
The pattern formation step is,
Preparing a roller with an embossed or engraved pattern formed thereon;
heating the roller; and
An eco-friendly recycled leather wallpaper manufacturing method comprising the step of press-fitting the surface of the recycled leather fabric with the heated roller. delete