TWI737272B - Leather material and manufacturing method thereof - Google Patents

Abstract

The present invention is relates to a leather material and a manufacturing method thereof. The leather material includes a substrate, a TPU adhering layer and at least one TPU surface layer. The substrate includes a first surface and a second surface. The TPU adhering layer is disposed on the first surface of the substrate. The at least one TPU surface layer is disposed on the TPU adhering layer. The at least one TPU surface layer includes an exposing surface having a texture of micro suede or micro nubuck. The leather material of the present invention utilizes the TPU material, and has a texture of micro suede or micro nubuck to have an appearance of leather. In addition, the leather material of the present invention has high peeling strength and high wear resistance to obtain the predetermined mechanical strength.

Description

Leather and its manufacturing method

The invention relates to a leather material and a manufacturing method thereof.

The conventional method of manufacturing leather generally uses a variety of complicated replication processes, and some of the processes require the use of solvents, which are harmful to the environment and do not meet environmental protection requirements. Moreover, the conventional method of manufacturing leather is not only complicated and time-consuming, but also has low manufacturing efficiency.

Therefore, it is necessary to provide an innovative and progressive leather material and its manufacturing method to solve the above-mentioned lack of knowledge.

The present invention relates to a leather material. In one embodiment, the leather material includes: a substrate, a thermoplastic polyurethane (TPU) adhesive layer, and at least one thermoplastic polyurethane surface layer. The substrate has a first surface and a second surface, and the second surface is opposite to the first surface. The thermoplastic polyurethane adhesive layer is disposed on the first surface of the substrate. The at least one thermoplastic polyurethane surface layer is disposed on the thermoplastic polyurethane adhesive layer, and the at least one thermoplastic polyurethane surface layer has an exposed surface, and the exposed surface has a suede-like feel or a nubuck leather feel.

The present invention relates to a method for manufacturing leather. In one embodiment, the manufacturing method of the leather material includes the following steps: providing a substrate, the substrate having a first surface and a second surface, the second surface is opposite to the first surface; melt-blowing a thermoplastic The polyurethane adhesive layer to the first surface of the substrate has a melt-blown distance of 300-500mm; a thermoplastic polyurethane surface layer is melt-blown onto the thermoplastic polyurethane adhesive layer with a melt-blown distance of 250-500mm; and The base material, the thermoplastic polyurethane adhesive layer and the thermoplastic polyurethane surface layer are processed together to prepare a leather material.

Refer to FIG. 1, which is a schematic diagram showing the structure of a leather material according to an embodiment of the present invention. In one embodiment, the leather 10 of the present invention includes a substrate 11, a thermoplastic polyurethane (TPU) adhesive layer 12 and at least one thermoplastic polyurethane surface layer 13. The leather material 10 of the present invention can be applied to artificial leather, or can be applied to imitated suede leather or imitated nubuck leather, but not limited to the above.

In one embodiment, the substrate 11 has a first surface 111 and a second surface 112, and the second surface 112 is opposite to the first surface 111. The base material 11 can be woven cloth, non-woven cloth, mesh cloth, recyclable woven cloth, recyclable non-woven cloth, recyclable mesh cloth, water card cloth, or different materials according to actual needs to meet actual applications.

In one embodiment, the thermoplastic polyurethane adhesive layer 12 is disposed on the first surface 111 of the substrate 11, and its content is 50-150 g/m ² , and the thermoplastic polyurethane adhesive layer 12 has a density of 0.2-0.4 g/cm ³ . In one embodiment, the content of the thermoplastic polyurethane adhesive layer 12 may be 90-120 g/m ² .

In one embodiment, the thermoplastic polyurethane surface layer 13 is disposed on the thermoplastic polyurethane adhesive layer 12, the content of the thermoplastic polyurethane surface layer 13 is 100-350 g/m ² , and the density of the thermoplastic polyurethane surface layer is 0.2-0.9 g/cm ³ . In one embodiment, the content of the thermoplastic polyurethane surface layer 13 is 100-200 g/m ² , and the density of the thermoplastic polyurethane surface layer is 0.25-0.5 g/cm ³ . In one embodiment, the thermoplastic polyurethane adhesive layer 12 is disposed between the substrate 11 and the thermoplastic polyurethane surface layer 13 as an adhesive layer to increase the peel strength of the leather 10 to above 0.8 Kg/cm.

In one embodiment, the thermoplastic polyurethane surface layer 13 has an exposed surface 131, and the exposed surface 131 has a hairy feel. In one embodiment, the exposed surface 131 can be polished to make a suede-like surface with a suede-like feel. After the peeling test by a peeling test machine (tensile machine), the peeling strength of the suede-like surface leather is greater than 0.8Kg/cm. After the abrasion resistance test of the abrasion test machine (STOLL test machine), the abrasion resistance of the suede surface leather material is greater than 950 revolutions.

In one embodiment, the exposed surface 131 can be grinded to make an imitation nubuck leather surface, which has an imitation nubuck leather surface feel, and the surface of the imitation nubuck leather has a less fluffy feel than the aforementioned suede Fuzziness on the surface. After the peeling test by a peeling test machine (tensile machine), the peeling strength of the imitation nubuck leather surface leather is greater than 1.0Kg/cm. After the abrasion resistance test of the abrasion tester (STOLL tester), the abrasion resistance of the imitation nubuck leather surface leather is greater than 1500 revolutions.

Therefore, the leather material of the present invention is made of thermoplastic polyurethane material, and can have a suede-like feel or a nubuck leather feel, so that the leather 10 of the present invention has a fluffy or fluffy feel to have the appearance and appearance of leather. Feel. Moreover, by using the above-mentioned content or density configuration of the thermoplastic polyurethane adhesive layer and the thermoplastic polyurethane surface layer, the leather 10 of the present invention can have high peel strength and abrasion resistance, so that the leather 10 of the present invention has a set mechanical strength.

Fig. 2 shows a schematic flow chart of a leather manufacturing method according to an embodiment of the present invention. With reference to FIGS. 1 and 2, first referring to step S21, a substrate 11 is provided. The substrate 11 has a first surface 111 and a second surface 112, and the second surface 112 is opposite to the first surface 111. The base material 11 can be woven cloth, non-woven cloth, mesh cloth, recyclable woven cloth, recyclable non-woven cloth, recyclable mesh cloth, water card cloth, or different materials according to actual needs to meet actual applications.

Referring to step S22, melt-blown a thermoplastic polyurethane adhesive layer 12 onto the first surface 111 of the substrate 11, the melt-blown distance is 300-500mm, and the melt-blown distance is from a first nozzle (not shown) to The distance between the first surface 111 of the substrate 11. The above-mentioned melt-blown distance can have a better fiber distribution.

In one embodiment, the step of melt-blowing the thermoplastic polyurethane adhesive layer 12 further includes using a low-melting-point thermoplastic polyurethane polymer with a melting point of 110~130˚C and placing it in a drying cylinder (not shown) After dehumidifying for 4 hours to make the water content less than 200 ppm, the low melting point thermoplastic polyurethane polymer is melt-blown by heating to form the thermoplastic polyurethane adhesive layer 12, and the melting point of the thermoplastic polyurethane adhesive layer 12 is 80-150°C.

Referring to step S23, melt-blown a thermoplastic polyurethane surface layer 13 onto the thermoplastic polyurethane adhesive layer 12, the melt-blown distance is 250-500mm, and the melt-blown distance is a second nozzle (not shown) to the thermoplastic polyurethane adhesive The distance of layer 12. The above-mentioned melt-blown distance can have a better fiber distribution.

In one embodiment, the step of melt-blowing the thermoplastic polyurethane surface layer 13 further includes using a thermoplastic polyurethane polymer with a melting point of 160~220˚C and dehumidifying in a drying cylinder (not shown) After 4 hours to make the water content less than 200 ppm, the thermoplastic polyurethane polymer is melt-blown by heating to form the thermoplastic polyurethane surface layer 13, and the melting point of the thermoplastic polyurethane surface layer 13 is 160-220°C.

Referring to step S24, the substrate 11, the thermoplastic polyurethane adhesive layer 12 and the thermoplastic polyurethane surface layer 13 are thermally bonded to produce the leather material 10. In one embodiment, the processing temperature of the thermal bonding process is 100-140°C.

In one embodiment, after the thermal bonding process, a polishing process is further included to polish one of the exposed surfaces 131 of the thermoplastic polyurethane surface layer 13, and the exposed surfaces 131 have a rough feeling.

In one embodiment, the exposed surface 131 can be polished to make a suede-like surface with a suede-like feel. After the peeling test of the peeling test machine (tension machine), the test speed is 50mm/min, and the size of the test piece is 2.54cm*15.24cm. Then, take the average of the most frequent occurrences in each interval (each 2cm is an interval, a total of 5 intervals). The test result shows that the peel strength of the suede-like surface leather material is greater than 0.8Kg/cm. After the abrasion resistance test of the abrasion tester (STOLL testing machine), first confirm the air table on the turntable. After the air table is pressurized, the film height is 15mm, and the pressure value is 6±0.5PSI. Then put the 112mm diameter test piece on the turntable and fix it. Use sandpaper (model K225-320J) and add 0.5 pounds of special weight inside to carry out abrasion test. 25 revolutions before each test, confirm whether the material is fixed; and every 300 revolutions, assess whether the sandpaper and test piece are in good condition. The test result shows that the abrasion resistance of the suede-like surface leather material is greater than 950 revolutions.

In one embodiment, the exposed surface 131 can be polished to make a nubuck leather-like surface, which has a nubuck leather-like feel. After the peeling test of the peeling test machine (tension machine), the test speed is 50mm/min, and the size of the test piece is 2.54cm*15.24cm. Then, take the average of the most frequent occurrences in each interval (each 2cm is an interval, a total of 5 intervals). The test result shows that the peel strength of the imitation nubuck leather surface leather is greater than 1.0Kg/cm. After the abrasion resistance test of the abrasion tester (STOLL testing machine), first confirm the air table on the turntable. After the air table is pressurized, the film height is 15mm, and the pressure value is 6±0.5PSI. Then put the 112mm diameter test piece on the turntable and fix it. Use sandpaper (model K225-320J) and add 0.5 pounds of special weight inside to carry out abrasion test. 25 revolutions before each test, confirm whether the material is fixed; and every 300 revolutions, assess whether the sandpaper and test piece are in good condition. The test results show that the wear resistance of the imitation nubuck leather surface leather is greater than 1500 revolutions.

[ Invention Examples 1]

A non-woven fabric made of PET is used as the base material 11.

Using thermoplastic polyurethane particles with a Shore hardness of 70-90A and a melting point of 100-150°C, they were dried at a set drying temperature of 80°C for 4 hours, and the measured moisture content was below 100ppm. Then use the first extruder to melt the thermoplastic polyurethane particles. The temperature from the feeding port to the outlet is 80°C, 180°C, 200°C, 210°C, 220°C, 230°C, the die temperature is 230°C, and the DIE temperature is 230°C. ℃, the spinning nozzle hot air temperature is 250℃, the spinning pressure is controlled above 4.5MPa and below 10MPa, the meltblown thermoplastic polyurethane adhesive layer 12 is laid on the substrate 11 in a fibrous manner, and the first extruder The melt-blown distance from the nozzle to the first surface 111 of the substrate 11 is 300 mm, the average fiber fineness of the thermoplastic polyurethane adhesive layer 12 is about 10 µm, the stack thickness of the thermoplastic polyurethane adhesive layer 12 is about 0.15 mm, and its weight is 90 -120g/m ² .

Using thermoplastic polyurethane particles with a Shore hardness of 70-90A and a melting point of 150-180°C, they were dried at a set drying temperature of 80°C for 4 hours, and the measured moisture content was below 100ppm. Then use the second extruder to melt the thermoplastic polyurethane particles. The temperature from the feeding port to the outlet is 90°C, 200°C, 220°C, 230°C, 240°C, 250°C, the die temperature is 250°C, and the DIE temperature is 250°C. ℃, the spinning nozzle hot air temperature is 260℃, the spinning pressure is controlled above 4.5MPa and below 10MPa, the meltblown thermoplastic polyurethane surface layer 13 is laid on the thermoplastic polyurethane adhesive layer 12 in a fibrous manner, and the second extruder The melt-blown distance between the two nozzles and the thermoplastic polyurethane adhesive layer 12 is 250 mm, the average fiber fineness of the thermoplastic polyurethane surface layer 13 is about 5-50 µm, and the stack thickness of the thermoplastic polyurethane surface layer 13 is about 0.35-0.45 mm, and the weight It is 200-350 g/m ² .

The laminated three-layer structure (the substrate 11, the thermoplastic polyurethane adhesive layer 12, and the thermoplastic polyurethane surface layer 13) is compounded by a flat ironing wheel. The temperature of the preheating wheel is 110°C and 150°C. The pressing The temperature of the wheel is 50°C, the extrusion gap is 1.00mm, and the production speed is 9m/min.

The exposed surface 131 of the thermoplastic polyurethane surface layer 13 is subjected to surface grinding processing, using a first version of sandpaper for grinding. The surface layer 13 is ground down to a thickness of 0.05mm; then, a second version of sandpaper is used for grinding. The second version of sandpaper has a mesh size of 150 and the grinding speed is 800~1000rpm, and then the thermoplastic polyurethane surface layer 13 is ground away. A thickness of 0.05mm; then, use a third edition of sandpaper to grind, the third edition of sandpaper has a mesh number of 240, and the grinding speed is 600~800rpm, the thermoplastic polyurethane surface layer 13 exposed surface 131 of the thermoplastic The polyurethane (TPU) dust is removed; then, a fourth edition sandpaper is used for grinding, the fourth edition sandpaper has a mesh number of 400, and the grinding speed is 600~800rpm, and the exposed surface of the thermoplastic polyurethane surface layer 13 131 is used for final trimming to make the cut surface feel more delicate after grinding and give it the feel of nubuck leather. The peel strength of the leather of the example of the present invention is above 3 Kg/cm.

Therefore, the leather manufacturing method of the present invention does not need to use any environmentally harmful solvents to meet the requirements of environmental protection, and the leather 10 of the present invention can be manufactured by the melt-blown process in the present invention, so as to save complicated manufacturing process and time. Can improve manufacturing efficiency. In addition, the above-mentioned melt-blown distance between the thermoplastic polyurethane adhesive layer and the thermoplastic polyurethane surface layer is used to have a better fiber distribution. Therefore, the leather 10 of the present invention can have high peel strength and abrasion resistance, making the present invention The leather 10 has a set mechanical strength. And after grinding treatment, the leather 10 of the present invention can have a suede-like feel or a nubuck leather-like feel, so as to have the appearance and feel of leather.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but do not limit the present invention. Modifications and changes made by those skilled in the art to the above-mentioned embodiments still do not violate the spirit of the present invention. The scope of rights of the present invention should be listed in the scope of patent application described later.

10: Leather 11: Substrate 12: Thermoplastic polyurethane adhesive layer 13: Thermoplastic polyurethane surface layer 111: first surface 112: second surface 131: Reveal the surface S21~S24: steps

Fig. 1 shows a schematic diagram of the structure of a leather material according to an embodiment of the present invention.

Fig. 2 shows a schematic flow chart of a leather manufacturing method according to an embodiment of the present invention.

10: Leather 11: Substrate 12: Thermoplastic polyurethane adhesive layer 13: Thermoplastic polyurethane surface layer 111: first surface 112: second surface 131: Reveal the surface

Claims (10)

A leather material, comprising: a base material having a first surface and a second surface, the second surface being opposite to the first surface; a thermoplastic polyurethane (TPU) adhesive layer disposed on the first surface of the base material On the surface; and at least one thermoplastic polyurethane surface layer disposed on the thermoplastic polyurethane adhesive layer, the at least one thermoplastic polyurethane surface layer has an exposed surface, the exposed surface has a suede-like feel or a nubuck leather feel, the thermoplastic polyurethane The density of the surface layer is 0.2-0.9g/cm ³ , and the average fiber fineness is 5-50μm. Such as the leather material of claim 1, wherein the density of the thermoplastic polyurethane adhesive layer is 0.2-0.4 g/cm ³ . Such as the leather material of claim 1, wherein the substrate is woven fabric, non-woven fabric, mesh fabric, recyclable woven fabric, recyclable non-woven fabric, recyclable mesh fabric, and water card cloth. Such as the leather material of claim 1, wherein the exposed surface has a hairy appearance. Such as the leather of claim 4, wherein the exposed surface is a suede-like surface or a nubuck leather-like surface. Such as the leather material of claim 1, wherein the peel strength of the leather material is greater than 0.8Kg/cm. Such as the leather material of claim 1, wherein the content of the thermoplastic polyurethane adhesive layer is 50-150 g/m ² . Such as the leather material of claim 7, wherein the content of the thermoplastic polyurethane adhesive layer is 90-120 g/m ² . Such as the leather material of claim 1, wherein the content of the thermoplastic polyurethane surface layer is 100-350 g/m ² . Such as the leather material of claim 9, wherein the content of the thermoplastic polyurethane surface layer is 100-200 g/m ² .

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