KR20210079726A - Complex including recycled leather and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a regenerated leather composite and a method for manufacturing the same. The regenerated leather composite according to the present invention includes: a regenerated leather layer, a non-woven fabric layer and a cork bark layer that are sequentially stacked; a first adhesive layer positioned between the regenerated leather layer and the nonwoven fabric layer; and a second adhesive layer positioned between the nonwoven fabric layer and the cork bark layer. According to the present invention, delamination problems are reduced.

Description

Recycled leather composite and manufacturing method thereof {Complex including recycled leather and manufacturing method of the same}

The present invention relates to a regenerated leather composite with reduced delamination problem and a method for manufacturing the same.

A large amount of leather products that are discarded in the manufacturing process are being generated, and a method of reusing them as regenerated leather is being developed.

However, when using the previously produced regenerated leather fabric for wallets, bags, shoes, etc., a problem of delamination occurred.

Korean Patent Registration Publication No. 10-1362366 (Announced on February 13, 2014)

An object of the present invention is to provide a regenerated leather composite with reduced delamination problem and a method for manufacturing the same.

The object of the present invention is, in the regenerated leather composite, the regenerated leather layer, the non-woven fabric layer and the cork bark layer that are sequentially stacked; a first adhesive layer positioned between the regenerated leather layer and the nonwoven fabric layer; and a second adhesive layer positioned between the nonwoven fabric layer and the cork bark layer.

It may further include a polyurethane layer coated on the outer surface of the regenerated leather layer.

The cork bark layer includes a first cork bark layer, and the first cork bark layer includes: a first drying step of drying the natural cork bark for 6 months to 1 year; A sterilization step of boiling the first dried natural cork bark in water at 100°C to 150°C for 10 hours to 30 hours; A second drying step of drying the sterilized natural cork bark; and a second dried natural cork bark, which may be obtained by preparing a cube and slicing it.

The regenerated leather layer, removing impurities from the waste leather raw material and selecting the usable portion; Preparing a regenerated leather raw material by grinding the selected leather raw material with a hammering machine and mixing 8-12% latex and 88-92% moisture; preparing a regenerated leather fabric by dehydrating the regenerated leather raw material at 80 to 150° C. with a roll press and compressing it to 1 mp to 5 mp; It can be provided through the step of coating a polyurethane layer on the front surface of the regenerated leather fabric.

The thickness of the regenerated leather layer is 0.8 to 1.2mm; The thickness of the polyurethane layer is 0.15 to 0.2mm; The thickness of the first adhesive layer is 0.05 to 0.1mm; The thickness of the nonwoven layer is 0.8 to 1.2 mm; The thickness of the second adhesive layer is 0.05 to 0.1mm; The thickness of the cork bark layer may be 0.2 to 0.3 mm.

The regenerated leather composite may be obtained by laminating 1mp to 3mp at 80 to 150°C.

The object of the present invention is to prepare a laminate by sequentially stacking a polyurethane layer, a regenerated leather layer, a first adhesive layer, a nonwoven fabric layer, a second adhesive layer and a cork bark layer in a method for producing a regenerated leather composite. step; and laminating the laminate at 1 mp to 3 mp at 80 to 150° C.

The cork bark layer includes a first cork bark layer, and the first cork bark layer includes: a first drying step of drying the natural cork bark for 6 months to 1 year; A sterilization step of boiling the first dried natural cork bark in water at 100°C to 150°C for 10 hours to 30 hours; A second drying step of drying the sterilized natural cork bark; and a second dried natural cork bark, which may be obtained by preparing a cube and slicing it.

The regenerated leather layer, removing impurities from the waste leather raw material and selecting the usable portion; Preparing a regenerated leather raw material by grinding the selected leather raw material with a hammering machine and mixing 8-12% latex and 88-92% moisture; The regenerated leather raw material is dehydrated at 80 to 150° C. with a roll press machine and then compressed to 1 mp to 5 mp to prepare a regenerated leather fabric, wherein the polyurethane layer is coated with polyurethane on the front surface of the regenerated leather fabric. It can be prepared through steps.

The thickness of the regenerated leather layer is 0.8 to 1.2mm; The thickness of the polyurethane layer is 0.15 to 0.2mm; The thickness of the first adhesive layer is 0.05 to 0.1mm; The thickness of the nonwoven layer is 0.8 to 1.2 mm; The thickness of the second adhesive layer is 0.05 to 0.1mm; The thickness of the cork bark layer may be 0.2 to 0.3 mm.

According to the present invention, there is provided a regenerated leather composite with reduced delamination problem and a method for manufacturing the same.

1 is a cross-sectional view of a regenerated leather composite according to an embodiment of the present invention;
2 is a flowchart of a method for manufacturing a regenerated leather composite according to an embodiment of the present invention;
3 to 7 show a method of manufacturing a cork bark layer in a method of manufacturing a regenerated leather composite according to an embodiment of the present invention;
8 shows the laminating apparatus used in the experimental example of the present invention,
Figure 9 shows the regenerated leather composite prepared in the experimental example of the present invention,
10 and 11 show the test results of the regenerated leather composite prepared in the experimental example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present embodiment is not limited to the embodiment disclosed below, but may be implemented in various forms with each other, and only this embodiment allows the disclosure of the present invention to be complete and the scope of the invention to those of ordinary skill in the art It is provided for complete disclosure. The shapes of elements in the drawings may be exaggerated for more clear explanation, and elements indicated by the same reference numerals in the drawings mean the same elements.

A regenerated leather composite according to an embodiment of the present invention will be described with reference to FIG. 1 .

The regenerated leather composite (1) is a polyurethane layer (10), a regenerated leather layer (20), a first adhesive layer (30), a nonwoven fabric layer (40), a second adhesive layer (50) and a cork bark layer (60) consists of

The polyurethane layer 10 is coated on the outer surface of the regenerated leather layer 20 .

The thickness of the polyurethane layer 10 is 0.15 to 0.2mm, the thickness of the regenerated leather layer 20 is 0.8 to 1.2mm, the thickness of the first adhesive layer 30 is 0.05 to 0.1mm, the thickness of the nonwoven fabric layer 40 is 0.8 to 1.2mm, the thickness of the second adhesive layer 50 may be 0.05 to 0.1mm, and the thickness of the cork bark layer 60 may be 0.2 to 0.3mm.

The adhesive of the first adhesive layer 30 and the second adhesive layer 50 may be made of a polyurethane material, and those that have passed the child safety standard KC certification are used. The adhesive should not peel off the cork at a heat-resistant temperature of 80 to 100°C.

The nonwoven fabric layer 40 may be formed of a nonwoven fabric of 30-50% PET (polyethylene terephthalate) and 50-70% PA (polyamide).

The above components are bonded to each other through a laminating process.

Cork is an eco-friendly material that can appeal to stories, functionality, and design when making products, and nonwovens solve the problem of delamination of existing recycled leather.

The regenerated leather composite (1) according to the present invention can be applied to a most suitable DIY kit when used on both sides as a new material, and can be particularly used for products aimed at children.

Hereinafter, a method of manufacturing the regenerated leather composite 1 according to the present invention will be described with reference to FIG. 2 .

First, the cork bark layer 60 is prepared (S100).

This process includes a first drying step of drying the natural cork bark for 6 months to 1 year; A sterilization step of boiling the first dried natural cork bark in water at 100°C to 150°C for 10 hours to 30 hours; A second drying step of drying the sterilized natural cork bark; and a process of preparing and slicing cubes from the second dried natural cork bark.

The natural cork bark that was warped during the sterilization stage can be stretched out. After the second drying step, only 2-3 grades of cork bark can be selected.

Cubes can be made in two ways.

In the first method, as shown in FIGS. 3 and 4 , the dried cork bark is standardized to have a width of 10 cm x a length of 15 cm. Use ISAR SC 495/5 adhesive with standardized cork bark in the transverse or longitudinal direction to produce Cube 1 with a size of 950 x 650 (mm) at an adhesion temperature of 30℃ or higher and a compression strength of 100kpa or higher.

In the second method, as shown in FIGS. 5 and 6 , the dried cork bark is sliced out of shape. Put the sliced cork bark into a 950 X 650 (mm) mold and make Cube 2 with a compressive strength of 200kpa or more.

Cube 1 and Cube 2 are selected and used as needed.

Thereafter, as shown in FIG. 7, it is put into a slicing machine and sliced to a thickness of 0.2 to 0.3 mm.

Next, the regenerated leather layer 20 is provided (S200).

The regenerated leather layer 20 includes the steps of removing impurities from waste leather raw materials and selecting usable parts; Preparing a regenerated leather raw material by grinding the selected leather raw material with a hammering machine and mixing a latex solution having a latex content of 8 to 12% by weight; And it can be manufactured through the process of preparing the regenerated leather fabric by compressing the regenerated leather raw material to 1 mp to 5 mp after dehydration at 80 to 150 ° C with a roll press. Thereafter, the regenerated leather layer 20 can be obtained by cutting the regenerated leather fabric.

Thereafter, a polyurethane layer 10 is formed on the regenerated leather layer 20 (S300).

The polyurethane layer 10 is formed by coating polyurethane on the regenerated leather layer 20 . Various colors and textures can be expressed by the polyurethane layer 10 .

Finally, the components are stacked and laminated (S400).

Laminating is a step of preparing a laminate by sequentially laminating a polyurethane layer, a regenerated leather layer, a first adhesive layer, a nonwoven fabric layer, a second adhesive layer, and a cork bark layer; and laminating the laminate at 80 to 150° C. at 1 mp to 3 mp.

The order of the three steps described above may be changed. For example, the regenerated leather layer 20 may be prepared first and then the cork bark layer 60 may be manufactured, and the two layers 20 and 60 may be simultaneously manufactured through a separate process. The polyurethane layer 10 may be formed immediately after manufacturing the regenerated leather layer 20 or may be formed after a predetermined time.

The present invention will be described in more detail with reference to the following experimental examples.

A regenerated leather composite was prepared by the method described above.

The cork bark is from Portugal and has been dried for one year. After drying, the bark was sterilized by boiling at 100°C for 15 hours.

Detailed manufacturing conditions are as follows.

Recycled leather layer manufacturing

Regenerated leather raw material is produced by mixing 10 wt% latex solution for 25 minutes, and the recycled leather raw material is dehydrated at 95°C and compressed at 2 mp pressure to form a fabric with a width of 1400 mm and a thickness of 0.8 mm. Various colors and textures are realized by processing the pu coating thickness of 0.15mm on the surface

laminating

Adhesive used: web - Usage: 25g

Non-woven fabric: PA 60% , PET 40% - Usage: 40g

Adhesive temperature: 95℃

Time: 3.5m/min

Pressure: 2mp

For laminating, the device of FIG. 8 was used, and the specifications of the device are as follows.

Power Supply :380V(4P)

Heater: 62.0kw

Temperature : 0~300℃

Speed Control : 5~25s

Belt Size : 1600 x 6040

Dimensions: 5500 x 2150 x 1180

The analysis results of the regenerated leather composite prepared in the experimental example are as follows.

The sample is shown in FIG. 9, and the analysis results are shown in FIGS. 10 and 11 .

Looking at the performance index for the kc certification of children's leather products, formaldehyde and hexavalent chromium were judged as suitable, and lead and cadmium were not detected. The tensile strength was also higher than the standard value of 580N/cm ^{2 .}

When reciprocating the regenerated leather composite prepared in the experimental example by hand more than 10 times, the non-woven fabric side holds the tissue of the regenerated leather with the adhesive, so no delamination phenomenon was found.

On the other hand, when non-woven fabric was not used, delamination occurred in the regenerated leather part when reciprocating more than 10 by hand, and the adhered cork was detached.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the protection scope of the present invention as long as they are apparent to those of ordinary skill in the art.

Claims (10)

In the regenerated leather composite,
a regenerated leather layer, a non-woven fabric layer and a cork bark layer sequentially stacked;
a first adhesive layer positioned between the regenerated leather layer and the nonwoven fabric layer; and
Regenerated leather composite comprising a second adhesive layer positioned between the nonwoven fabric layer and the cork bark layer. According to claim 1,
Regenerated leather composite further comprising a polyurethane layer coated on the outer surface of the regenerated leather layer. 3. The method of claim 2,
The cork bark layer,
a first cork bark layer;
The first cork bark layer,
A first drying step of drying the natural cork bark for 6 months to 1 year;
A sterilization step of boiling the first dried natural cork bark in water at 100°C to 150°C for 10 hours to 30 hours;
A second drying step of drying the sterilized natural cork bark; and
A regenerated leather complex obtained by preparing and slicing cubes from the second dried natural cork bark. 4. The method of claim 3,
The regenerated leather layer,
removing impurities from waste leather raw materials and selecting usable parts;
Preparing a regenerated leather raw material by grinding the selected leather raw material with a hammering machine and mixing 8-12% latex and 88-92% moisture;
preparing a regenerated leather fabric by dehydrating the regenerated leather raw material at 80 to 150° C. with a roll press and compressing it to 1 mp to 5 mp;
Regenerated leather composite prepared through the step of coating a polyurethane layer on the front surface of the regenerated leather fabric. 5. The method according to any one of claims 1 to 4,
The thickness of the regenerated leather layer is 0.8 to 1.2mm;
The thickness of the polyurethane layer is 0.15 to 0.2mm;
The thickness of the first adhesive layer is 0.05 to 0.1mm;
The thickness of the nonwoven layer is 0.8 to 1.2 mm;
The thickness of the second adhesive layer is 0.05 to 0.1mm;
The thickness of the cork bark layer is 0.2 to 0.3mm regenerated leather composite. 6. The method of claim 5,
The regenerated leather composite is a regenerated leather composite obtained by laminating 1mp to 3mp at 80 to 150°C. In the manufacturing method of the regenerated leather composite,
preparing a laminate by sequentially stacking a polyurethane layer, a regenerated leather layer, a first adhesive layer, a nonwoven fabric layer, a second adhesive layer, and a cork bark layer; and
A manufacturing method comprising the step of laminating the laminate at 1mp to 3mp at 80 to 150°C. 8. The method of claim 7,
The cork bark layer,
comprising a first cork bark layer,
The first cork bark layer,
A first drying step of drying the natural cork bark for 6 months to 1 year;
A sterilization step of boiling the first dried natural cork bark in water at 100°C to 150°C for 10 hours to 30 hours;
A second drying step of drying the sterilized natural cork bark; and
A second manufacturing method obtained by manufacturing and slicing cubes from dried natural cork bark 9. The method of claim 8,
The regenerated leather layer,
removing impurities from waste leather raw materials and selecting usable parts;
Preparing a regenerated leather raw material by grinding the selected leather raw material with a hammering machine and mixing 8-12% latex and 88-92% moisture;
The regenerated leather raw material is dehydrated at 80 to 150° C. with a roll press machine and then compressed to 1 mp to 5 mp to prepare a regenerated leather fabric,
The polyurethane layer is a manufacturing method prepared through the step of coating the polyurethane on the front surface of the regenerated leather fabric. 10. The method of claim 9,
The thickness of the regenerated leather layer is 0.8 to 1.2mm;
The thickness of the polyurethane layer is 0.15 to 0.2mm;
The thickness of the first adhesive layer is 0.05 to 0.1mm;
The thickness of the nonwoven layer is 0.8 to 1.2 mm;
The thickness of the second adhesive layer is 0.05 to 0.1mm;
The thickness of the cork bark layer is 0.2 to 0.3mm manufacturing method.

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