TWI774336B - Processed leather and method for processing leather - Google Patents

Abstract

A method for processing a leather is provided in the present disclosure. The method for processing the leather includes steps as follows. A grain leather is provided, a feeding step is performed, a needle-punching step is performed and a collecting step is performed. The grain leather includes an outer surface and an inner surface opposite to each other. In the feeding step, the grain leather is fed in a first direction. In the needle-punching step, the grain leather is penetrated with a plurality of needles while the grain leather is fed, so as to form a processed leather, wherein the plurality of needles penetrate in a second direction, and the outer surface of the grain leather facing the plurality of needles. In the collecting step, the processed leather is collected, and a punching density of the processed leather is 250 punches/cm ²to 300 punches/cm ². Therefore, the processed leather with unique texture can be manufactured, and the processed leather has significantly improved breathability, which is favorable for providing extra comfort to wearers who wear the products made of the processed leather.

Description

Processing leather and method of processing leather

The present invention relates to a method for processing leather and processing leather, in particular to a method for processing leather and processing leather using acupuncture technology.

Leather is a widely used natural material for the production of various items such as clothing, footwear and furniture. Leather has physical properties such as high mechanical strength, tear resistance and thermal insulation, making leather an irreplaceable natural material. One of the most special properties of leather is breathability, that is, its ability to absorb and subsequently release moisture. Therefore, moisture does not stay inside the leather, providing comfort when wearing the leather product and reducing odors in the leather product.

However, the moisture vapor transmission rate (MVTR) of conventional benzene dyed full-grain leather is about 4-6 mg/cm ² /hr, which can affect the inherent breathability of leather. Therefore, it is very important to further improve the breathability of leather while maintaining its strength and performance during leather processing.

In view of this, the present invention proposes a process for physically rearranging the fiber structure, the structural fibers not only refer to the surface of the raw hide, but also include the fibers in the cross section of the leather. This technology greatly assists in the release of heat and moisture through the leather's fibrous structure.

One aspect of the present invention provides a method of processing leather, which includes providing a raw hide, performing a feeding step, performing a needling step, and performing a collecting step. The raw hide includes an opposite outer surface and an inner surface. The feeding step is to feed the hides along a first direction. The needling step is to use a plurality of needles to pierce the raw hide to form a processed leather when the raw hide is fed, wherein the needles are poked along a second direction, and the outer surface of the raw hide faces the needles. The collecting step is to collect processed leather, wherein a needle punch density of the processed leather is 250 to 300 needles per square centimeter.

Accordingly, the method of processing leather of the present invention is used to produce processed leather having a unique texture. Due to its unique texture, the breathability of processed leather is significantly increased, helping to provide additional comfort to the wearer of processed leather products.

According to the aforementioned method of treating leather, the second direction may be perpendicular to the first direction.

According to the aforementioned method for processing leather, each needle includes a puncturing portion, and a cross-sectional shape of the puncturing portion may be a triangle.

According to the aforementioned method of treating leather, the piercing portion may be curved.

According to the aforementioned method of processing leather, each needle may further comprise at least one hook portion and one end portion, the hook portion is located at the puncturing portion, and the distance between the hook portion and the end portion may be no less than 3 mm.

According to the aforementioned method for processing leather, in the feeding step, the raw hides are fed at a feeding speed, and the feeding speed can be 0.80 to 0.90 meters per minute, and in the needling step, the needles are The jabs are performed at one needling frequency, and the needling frequency may be 600 to 620 times per minute.

According to the aforementioned method for processing leather, in the needling step, the needles pierce the raw hide to a piercing depth, and the piercing depth may be 12 mm to 18 mm.

Another aspect of the present invention provides a processed leather comprising a plurality of leather fibers, the leather fibers are rearranged to form a plurality of arrangement channels, the arrangement channels are redistributed to have a density, and the density is 250 per square centimeter channels to 300 channels.

According to the aforementioned processed leather, the water vapor transmission rate of the processed leather may be 12 mg/cm ² /hr to 16 mg/cm ² /hr.

Various embodiments of the present invention are discussed in greater detail below. However, this embodiment can be an application of various inventive concepts and can be embodied in various specific scopes. The specific embodiments are for illustrative purposes only, and are not intended to limit the scope of the disclosure. In addition, for the purpose of simplifying the drawings, some well-known and conventional structures and elements will be shown in a simple and schematic manner in the drawings.

Please refer to FIG. 1. FIG. 1 is a flow chart of steps of a method 100 for processing leather according to an aspect of the present invention. The method 100 of processing leather includes step 110 , step 120 , step 130 and step 140 .

Please also refer to FIG. 2. FIG. 2 is a schematic diagram of the method 100 of processing leather of FIG. 1. FIG. Step 110 is to provide a raw leather 210. The raw leather 210 can be a genuine leather, a full grain leather, a top grain leather or a split leather. The raw skin 210 includes an outer surface 211 and an inner surface 212 , and the outer surface 211 and the inner surface 212 are opposite to each other. The outer surface 211 represents the surface of the raw hide 210 connected to or adjacent to the rawhide hair layer, and the inner surface 212 represents the surface of the raw hide 210 connected to or adjacent to the rawhide muscle layer.

Step 120 is to perform a feeding step, which is to feed the raw hides 210 along a first direction D1. Specifically, the raw hides 210 are fed at a feeding speed, and the feeding speed may be 0.80 to 0.90 meters per minute, thereby ensuring that the raw hides 210 can be processed completely and uniformly in the subsequent steps.

Step 130 is a needling step, which is to use a plurality of needles 310 to puncture the raw hide 210 when the raw hide 210 is fed. For example, a needling machine 300 may be used to pierce the raw hide 210 . The acupuncture machine 300 includes the plurality of needles 310 , a two-hole plate 320 and a plate body 330 , the raw hide 210 can be transported between the two-hole plates 320 , and the two-hole plate 320 can support the raw hide 210 during the needling process. The needle 310 is disposed on the plate body 330 , and the plate body 330 can move back and forth, so the needle 310 also moves repeatedly and pierces the hole on the two-hole plate 320 and the raw skin 210 .

Specifically, in the needling step, the needle 310 pierces the section of the raw hide 210 along a second direction D2 , and the outer surface 211 of the raw hide 210 faces the needle 310 . The second direction D2 may be perpendicular to the first direction D1, and the needle 310 is punctured at a needling frequency, and the needling frequency may be 600 to 620 times per minute. The specific needling direction and needling frequency can prevent the needles 310 from pulling the fibers along the first direction D1 and prevent unexpected cracks on the outer surface 211 of the raw hide 210 .

After the needling step, the raw hide 210 is formed into a processed leather 220 . To be more specific, the processed leather 220 includes a plurality of leather fibers, and the leather fibers are rearranged to form a plurality of arrangement channels, and a needling density of the processed leather 220 is 250 to 300 thorns per square centimeter, which means that the arrangement channels are redistributed. A density, and the density is 250 channels to 300 channels per square centimeter, so that the surface of the processed leather 220 has redistributed arrangement channels. In the following paragraphs, the advantages brought by the unique texture on the processed leather 220 will be discussed and will not be discussed here. Next, step 140 is to perform a collecting step to collect the processed leather 220 .

Please refer to FIG. 3 , which is a partial schematic diagram of a needle 310 used in the needling step of the method 100 for treating leather in FIG. 1 . Each needle 310 includes a puncturing portion 311 for piercing the raw skin 210 , and the puncturing portion 311 may be straight or curved. When the piercing portion 311 is curved, an oblique stabbing effect can be formed on the outer surface 211 of the raw hide 210 , and the oblique stabbing effect lengthens the poking path of the needle 310 , thereby generating more fiber arrays in the raw hide 210 . Therefore, the toughness of the raw skin 210 can be improved and the elongation at break thereof can be reduced. A cross-sectional shape of the puncturing portion 311 may be a triangle, so as to generate a balanced deflection under the force in all directions, and reduce the possibility of needle breakage.

Each needle 310 may include at least one hook portion 312 located at the piercing portion 311. When the needle 310 pierces the raw hide 210, the fibers of the raw hide 210 will be pulled by the hook portion 312 and dragged along the second direction D2. Thus, the fibers of the raw hide 210 can be repositioned and the texture of the outer surface 211 of the raw hide 210 can be changed. Each needle 310 may include an end portion 313, and a distance L between the hook portion 312 and the end portion 313 may be not less than 3 mm. In the needling step, the needles 310 pierce the raw hide 210 to a piercing depth, and the piercing depth may be 12 mm to 18 mm, according to which, the distance that the fibers of the raw hide 210 are stabbed is sufficient to reach the outer surface of the raw hide 210 Unrecoverable micro-channels formed on 211.

Please refer to FIGS. 4A and 4B, FIG. 4A is an image of a processed leather 220 in another aspect of the present invention, and FIG. 4B is an image of a conventional benzene dyed full-grain leather, wherein the processed leather 220 is Manufactured by the aforementioned method 100 of processing leather. In Fig. 4A, the processed leather 220 has a unique and messy leather surface, but the surface of the conventional benzene dyed full-grain leather in Fig. 4B is unaltered, and it can be seen that the method 100 of treating the leather helps to lighten or hide The imperfections in the raw hide 210 and the messy leather surface of the processed leather 220 give the processed leather 220 a special appearance.

5A and 5B, FIG. 5A is a schematic cross-sectional view of the processed leather 220 in FIG. 4A, and FIG. 5B is a cross-sectional schematic view of the conventional benzene dyed full-grain leather in FIG. 4B. In Figure 5A, the processed leather 220 contains a plurality of rearranged leather fibers (not numbered), the leather fibers forming the alignment channels 221. By comparing Fig. 5A and Fig. 5B, in Fig. 5A, the arrangement channels 221 on the surface of the messy leather are straight, which shortens the evaporation path A and helps the water vapor to pass through the processed leather 220. On the contrary, in Fig. 5B, the conventional benzene dyed full-grain skin has no arrangement channel, and the evaporation path A1 is long and curved.

The air permeability of the processed leather 220 is measured below according to the American Society for Testing and Materials (ASTM) standard, and the water vapor transmission rate of the processed leather 220 may be 12 mg/cm ² /hr to 16 mg/cm ² /hr. This water vapor transmission rate test proves that through the method 100 of processing leather, the air permeability of the processed leather 220 can be greatly improved, and the ability of the processed leather 220 to release vapor state moisture is also significantly improved.

To sum up, the method for processing leather of the present invention is used to manufacture processed leather with unique texture. Due to its unique texture, the breathability of processed leather is significantly increased, helping to provide additional comfort to the wearer of processed leather products.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

100: Methods of processing leather 110, 120, 130, 140: Steps 210: Raw Leather 211: outer surface 212: inner surface 220: Processed Leather 221: Arrange channels 300: Needle punching machine 310: Needle 311: Puncture Department 312: Hook 313: End 320: Orifice plate 330: Board body D1: first direction D2: Second direction L: distance A, A1: Evaporation path

In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows: Fig. 1 is a flow chart of the steps of a method for processing leather according to an aspect of the present invention; Figure 2 is a schematic diagram of the method of processing leather of Figure 1; Fig. 3 is a partial schematic view of a needle used in the needling step of the method for treating leather in Fig. 1; Figure 4A is an image of a processed leather according to another aspect of the present invention; Figure 4B is an image of a conventional benzene dyed full-grain skin; Figure 5A is a schematic cross-sectional view of the processed leather of Figure 4A; and FIG. 5B is a schematic cross-sectional view of the conventional benzene-dyed full-grain skin of FIG. 4B .

100: Methods of processing leather

110, 120, 130, 140: Steps

Claims (8)

A method for processing leather, comprising: providing a raw hide, the raw hide comprising an opposite outer surface and an inner surface; performing a feeding step, which is to feed the raw hide along a first direction; performing a needling step , is to use a plurality of needles to poke the raw hide to form a processed leather when the raw hide is fed, wherein the needles stab the raw hide along a second direction to a stab depth, and the raw hide is The outer surface faces the needles; and a collecting step is performed to collect the processed leather, wherein a needle punch density of the processed leather is 250 to 300 punches per square centimeter, and the punch depth is 12 to 18 mm. The method of processing leather as claimed in claim 1, wherein the second direction is perpendicular to the first direction. The method for processing leather according to claim 1, wherein each of the needles includes a puncturing portion, and a cross-sectional shape of the puncturing portion is a triangle. The method of processing leather as claimed in claim 3, wherein the piercing portion is curved. The method for treating leather according to claim 3, wherein each of the needles further comprises at least one hook portion and one end portion, the hook portion is located at the puncturing portion, And a distance between the hook portion and the end portion is not less than 3 mm. The method for processing leather according to claim 1, wherein in the feeding step, the raw hides are fed at a feeding speed of 0.80 to 0.90 meters per minute, and in the In the needling step, the needles are poked at a needling frequency, and the needling frequency is 600 to 620 times per minute. A processed leather, comprising: a plurality of leather fibers, the leather fibers are rearranged to form a plurality of arrangement channels, the arrangement channels are redistributed to be a density, and each of the arrangement channels has a depth; wherein, the density is 250 to 300 channels per square centimeter, and the depth is 12 mm to 18 mm. The processed leather of claim 7, wherein the processed leather has a water vapor transmission rate of 12 mg/cm ² /hr to 16 mg/cm ² /hr.

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