TWI874155B - Plant leather gradient pattern production method - Google Patents

Abstract

The present invention provides a method for making a plant leather gradient pattern, which mainly involves applying pressure and different temperatures to the top and bottom of a plant leather sheet simultaneously for maturation. The top side of the plant leather sheet is subjected to high temperature, and the bottom side of the plant leather sheet is subjected to low temperature. The high temperature refers to the temperature at which the plant leather sheet can be heat-formed, including multiple different temperatures, and the low temperature refers to the temperature below room temperature. In this way, the plant leather sheet can be formed into a plant leather with a gradient pattern by using pressure and temperature differences at different parts.

Description

Method for making gradient patterns on plant leather

The present invention is related to plant leather, and more specifically, refers to a method for producing a plant leather gradient pattern.

According to the law, natural leather made from animal fur violates the concept of conservation. Therefore, it is known that artificial leather (or synthetic leather/artificial leather) has a high degree of commercial application. It is mostly composed of non-woven fabric as the base, and a layer of elastic material (such as polyurethane PU and polyvinyl chloride PVC and other plastic materials) is attached to the surface of the base. The surface of the elastic material layer is further processed through multiple surface treatment procedures (such as printing, embossing, roller coating, spraying, polishing, kneading, hot stamping, laminating, flocking, laminating, etc.) to produce wrinkles and textures on the elastic material layer, thereby improving the degree of simulation of natural leather.

Secondly, based on the need for environmental protection, some companies have begun to develop plant leather in recent years. Generally speaking, it is made by adding plant materials and fibers to elastic materials (such as rubber and plastic materials) (rubber is also a plant material). Its surface still needs to go through the aforementioned artificial leather surface treatment process to simulate natural leather.

In other words, the preparation of plant leather surface texture is still the same as artificial leather, which is formed by direct pressure using an embossing mold. Although this surface texture formation method is effective, it inevitably appears a little stiff and unnatural.

Therefore, based on many years of experience in leather research and development, the inventor has developed this "plant leather gradient pattern production method" invention, which can solve the shortcomings of the conventional plant leather surface texture being relatively stiff and unnatural.

The main purpose of the present invention is to provide a method for producing a gradient pattern on plant leather, which can produce a more natural gradient pattern on the top or bottom side of plant leather than the embossed pattern of conventional artificial leather, and is of great practical value.

Therefore, in order to achieve the above-mentioned purpose, the present invention provides a method for making a plant leather gradient pattern, which mainly applies pressure and different temperatures to the top and bottom sides of a plant leather sheet simultaneously for maturation. The top side of the plant leather sheet is subjected to high temperature, and the bottom side of the plant leather sheet is subjected to low temperature. The high temperature refers to the temperature at which the plant leather sheet can be heat-formed, including multiple different temperatures, and the low temperature refers to the temperature below room temperature.

Preferably, the low temperature is a predetermined temperature.

Preferably, the low temperature includes a plurality of different temperatures, and each temperature is applied to the bottom side of the vegetable leather sheet at intervals.

Preferably, the different temperatures of the high temperature are applied to the top side of the vegetable leather sheet at intervals.

Preferably, the different temperatures of the high temperature are applied to the top side of the vegetable leather sheet at intervals.

Preferably, the different temperatures of the high temperature gradually increase from one side of the plant leather sheet to the other side, and the different temperatures of the low temperature gradually decrease from one side of the plant leather sheet to the other side corresponding to the high temperature.

Preferably, when heat pressing is applied to the top side of the plant leather sheet, a plurality of concave and convex areas are simultaneously generated on the top side of the plant leather sheet.

Preferably, a heat-pressing shaping sheet is attached to the bottom side of the plant leather sheet, and the heat-pressing shaping sheet is attached to the plant leather sheet by heat-pressing synchronously, and the heat-pressing shaping sheet produces a concave-convex deformation when the top side of the plant leather sheet is pressed, thereby causing the plant leather sheet to deform and produce a number of concave-convex parts.

Preferably, it further comprises a surface treatment means, which is to perform surface treatment on multiple locations of the top surface of the plant leather sheet by physical and/or chemical methods to accelerate the formation of the gradient pattern.

Preferably, each position of the top surface of the vegetable leather sheet that is surface treated corresponds to a different temperature of high temperature.

The present invention:

1: Plant leather sheet

4: Damaged parts

5: Hot pressing shaping sheet

6: Concave and convex parts

7: Embossed parts

8: Plant leather

10: Concave and convex parts

12: Concave and convex parts

Usage:

2, 3: Upper and lower pressure plates

9: Upper roller

11: Lower roller

The first figure is a schematic diagram of the manufacturing method of a preferred embodiment of the present invention.

The second figure is a schematic diagram of the manufacturing method of another preferred embodiment of the present invention.

The third figure is a schematic diagram of the surface treatment of another preferred embodiment of the present invention.

The fourth figure is a schematic diagram of the manufacturing method of another preferred embodiment of the present invention.

The fifth figure is an enlarged schematic diagram of plant leather made in another preferred embodiment of the present invention.

Figure 6 is a schematic diagram of the manufacturing method of another preferred embodiment of the present invention.

Below, several preferred embodiments of the present invention are listed and further described in detail with accompanying drawings:

First, please refer to the first figure, a preferred embodiment of the present invention is a method for making a plant leather gradient pattern, which is made of a plant leather sheet 1, which is made of natural rubber extracted from rubber tree latex as the main material, but not limited to, and is mixed with foaming agent and vulcanizing agent and other auxiliary agents, additives and some elastic materials and other materials to form a sheet (the content of natural rubber accounts for more than 50% of the total), each of which is a related additive and auxiliary agent required for the foaming molding of natural rubber materials, and is a known technology. The detailed components are not described here. The present invention applies pressure to the top and bottom sides of the plant leather sheet 1 at the same time and applies different temperatures to heat and mature the plant leather sheet 1 into plant leather. The pressure applied to the top and bottom sides of the plant leather sheet 1 is used to control the thickness of the plant leather. The heating method is to apply high temperature to the top side of the plant leather sheet 1 and apply low temperature to the bottom side of the plant leather sheet 1 at the same time. The high temperature refers to the temperature at which the plant leather sheet can be heated and matured, including applying multiple different temperatures to the top side of the plant leather sheet 1 at intervals. degrees (more than 2 different temperatures are sufficient, and each temperature is separated by an appropriate distance, which is determined by the width of the plant leather sheet 1 and the number of different temperatures. That is, under the limitation of the fixed width of the plant leather sheet 1, the more the number of different temperatures, the shorter the distance between the temperatures). For example, in this embodiment, the plant leather sheet 1 is made of natural rubber as the main material, and the foaming and maturing temperature of natural rubber is mainly between 120 degrees Celsius and 200 degrees Celsius. Therefore, the different temperatures of the high temperature can be 120 degrees, 140 degrees, 160 degrees, 100°C and 200°C are temperatures that gradually increase from the left side to the right side of the plant leather sheet 1 (it can also be high temperature to low temperature, or gradually decrease from left to right), and there will be temperature changes between the temperatures (for example, 120°C and 140°C are temperatures that are higher than 120°C and lower than 140°C). The low temperature refers to a temperature below room temperature (25°C), and in this embodiment, it is 25°C, which is used to make the top and bottom sides of the plant leather sheet 1 have a large temperature difference, and to influence and control the maturation state of different high-temperature parts on the top side of the plant leather sheet 1 through low temperature.

The aforementioned method of simultaneously applying pressure to the top and bottom sides of the plant leather sheet 1 and applying different temperatures can be implemented using a known hot pressing device, but is not limited to such a method. Such hot pressing devices can be roller-type hot pressing devices (including upper and lower rollers of relative rollers) or pressure plate-type hot pressing devices (including upper and lower pressure plates 2 and 3 that are pressed relative to each other). This is a known technology and the detailed structure of such hot pressing devices will not be described here. The aforementioned method of applying the different temperatures of the high temperature to the top side of the plant leather sheet 1 at intervals can be to set multiple heating devices (such as the known electric heating rod, etc., but not limited to, not shown in the figure) on the upper roller of the roller-type hot pressing device or the upper pressing plate 2 of the pressing plate type hot pressing device, and the output temperature of each heating device is the different temperatures of the high temperature. The aforementioned method of applying the low temperature to the bottom side of the plant leather sheet 1 can be to set a single cooling device (such as the known cooling rod, cooling rod or connected water cooling equipment, etc., but not limited to, not shown in the figure) on the lower roller of the roller-type hot pressing device or the lower pressing plate 3 of the pressing plate type hot pressing device or no cooling device (when the low temperature is room temperature).

Thus, the method for producing the plant leather gradient pattern of the present invention is to make the top and bottom sides of the plant leather sheet 1 be subjected to pressure and be subjected to different temperatures for curing at the same time during the hot pressing curing process of the plant leather sheet 1. Through the effect of such temperature difference, the top of the plant leather sheet 1 can be affected by different degrees of curing and naturally produce gradient patterns, thereby obtaining a plant leather with a gradient pattern similar to a marble pattern on the surface, as shown in Appendix 1.

From the above, it can be seen that the technology of forming textures on plant leather in the present invention is different from the conventional method of directly applying pressure on the surface of artificial leather to form textures. Not only is the method of producing textures very novel, but also the irregular textures produced by different temperature differences are more natural and closer to the natural textures of natural leather.

As shown in the second figure, it is a schematic diagram of the manufacturing method of another preferred embodiment of the present invention. The technology is generally the same as the above-mentioned manufacturing method, except that: the low temperature applied to the bottom side of the plant leather sheet 1 includes a plurality of different temperatures (a plurality of cooling devices are provided in the roller under the roller-type hot pressing device or in the press plate 3 under the press plate type hot pressing device), for example, 15 degrees, 10 degrees and 5 degrees below room temperature, which is gradually cooled from the left side to the right of the plant leather sheet 1 to correspond to the high temperature ( The lower the low temperature, the higher the high temperature), but not limited to it, and the different low temperatures are applied to the bottom side of the plant leather sheet 1 at intervals and correspond to the positions between the different high temperatures rather than directly corresponding to the different high temperatures (for example, 15 degrees of low temperature corresponds to the position between 120 degrees and 140 degrees), so as to avoid affecting the different high temperatures acting on the top side of the plant leather sheet 1. The different ripening effects, but the effect of different low temperature effects and controlling the ripening state of different temperature parts on the top side of the plant leather sheet 1 can still be obtained. Based on this, by applying the low temperature to the bottom side of the plant leather sheet 1, more temperature differences can be generated at most parts of the top and bottom sides of the plant leather sheet 1, which can not only increase the gradient texture on the top side of the plant leather, but also make the bottom side of the plant leather have a gradient texture.

In addition, the plant leather gradient pattern manufacturing method of the present invention may further include a surface treatment method, as shown in the third figure, which is to use physical and/or chemical methods (such as ultraviolet irradiation, coating oil, solvent and other chemicals, etc.) that the natural rubber in the plant leather sheet 1 cannot withstand to perform surface treatment on multiple locations on the top surface of the plant leather sheet 1, so as to form a plurality of damaged locations 4 on the top surface of the plant leather sheet 1, and each of the damaged locations 4 corresponds to a different high temperature position on the top of the plant leather sheet 1, so as to increase the speed of generating the gradient pattern on the top of the plant leather sheet 1 and reduce the process time.

Furthermore, as shown in the fourth and fifth figures, the bottom side of the plant leather sheet 1 of the present invention can be further attached with a hot-pressing shaping sheet 5, which is a sheet made of a material that can be cooled and shaped after being hot-pressed, such as elastic materials such as PVC, PU, TPE, or non-woven fabrics, but not limited to, and the hot-pressing shaping sheet 5 can be hot-pressed and bonded with the plant leather sheet 1 simultaneously (using the known non-glue bonding technology of natural rubber and sheet, which will not be elaborated here, but not limited to), and the hot-pressing shaping sheet 5 is when the top side of the plant leather sheet 1 is pressed to produce a concave-convex deformation, thereby causing the top side of the plant leather sheet 1 to deform and produce a number of concave-convex parts 6.

The aforementioned technology for causing the heat-pressed shaping sheet 5 to produce concave-convex deformation can be used to add a embossing member 7 with concave-convex parts on the bottom side of the upper press plate 2 of the known press plate type hot press device, so as to produce a plant leather 8 with a gradient pattern and concave-convex parts 6 on the surface.

Of course, the aforementioned technique of making the heat-pressed shaping sheet 5 produce concave-convex deformation, as shown in FIG. 6, can also be used to add a plurality of concave-convex parts 10 on the surface of the upper roller 9 of the known roller-pressing hot-pressing device, and to add a plurality of concave-convex parts 12 on the surface of the lower roller 11 of the roller-pressing hot-pressing device in the opposite direction of the concave-convex parts 10. Based on this, the aforementioned plant leather 8 with a gradient pattern and concave-convex parts 6 on the surface can also be produced.

In summary, the method for preparing plant leather gradient patterns provided by the present invention is to heat-press and mature a pair of plant leather sheets, so that the top and bottom sides of the plant leather sheets are simultaneously subjected to pressure and matured at a variety of different temperatures. The different temperature differences make the top or bottom parts of the plant leather sheets mature at different degrees and naturally produce gradient patterns, thereby obtaining plant leather with gradient patterns on the surface. Such gradient patterns are more natural than the embossed patterns of conventional artificial leather, and the surface of the plant leather can be made to have concave and convex changes through embossing, which is very practical. Therefore, the present invention meets the requirements of an invention patent, and an application is filed in accordance with the law.

The above are only several preferred embodiments of the present invention and are not intended to limit the present invention. Anyone with common knowledge in the relevant technical field may make some modifications, changes and embellishments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1: Plant leather sheet

2, 3: Upper and lower pressure plates

Claims (10)

A method for making a plant leather gradient pattern mainly comprises applying pressure to the top and bottom sides of a plant leather sheet and applying different temperatures for maturation. The plant leather sheet is a sheet made of natural rubber as the main material. The top side of the plant leather sheet is subjected to high temperature, and the bottom side of the plant leather sheet is subjected to low temperature. The high temperature refers to the temperature at which the plant leather sheet can be heat-formed, including multiple different temperatures. The low temperature refers to the temperature below room temperature, so that the plant leather sheet is subjected to pressure and temperature difference at different parts, thereby obtaining a plant leather with a gradient pattern. The method for producing a plant leather gradient pattern as described in claim 1, wherein the low temperature is a predetermined temperature. The method for producing a plant leather gradient pattern as described in claim 1, wherein the low temperature includes a plurality of different temperatures, and each temperature is applied to the bottom side of the plant leather sheet at intervals. The method for producing a plant leather gradient pattern as described in claim 2, wherein the different high temperatures are applied to the top side of the plant leather sheet at intervals. The method for producing a plant leather gradient pattern as described in claim 3, wherein the different high temperatures are applied to the top side of the plant leather sheet at intervals. As described in claim 5, the method for making a plant leather gradient pattern, wherein each different temperature of the high temperature is gradually increased from one side of the plant leather sheet to the other side, and each different temperature of the low temperature is gradually decreased from one side of the plant leather sheet to the other side corresponding to the high temperature. As described in claim 1, the method for producing a plant leather gradient pattern, wherein when heat pressing is applied to the top side of the plant leather sheet, a plurality of concave and convex areas are simultaneously produced on the top side of the plant leather sheet. As described in claim 7, the method for making a plant leather gradient pattern, wherein a heat-pressing shaping sheet is attached to the bottom side of the plant leather sheet, and the heat-pressing shaping sheet is attached to the plant leather sheet by heat-pressing synchronously, and the heat-pressing shaping sheet produces a concave-convex deformation when the top side of the plant leather sheet is pressed, thereby causing the plant leather sheet to deform and produce a number of concave-convex parts. The method for producing a plant leather gradient pattern as described in any one of claims 1 to 8 further comprises a surface treatment method, which is to perform surface treatment on multiple locations of the top surface of the plant leather sheet by physical and/or chemical methods to accelerate the formation of the gradient pattern. The method for producing a plant leather gradient pattern as described in claim 9, wherein each position of the top surface of the plant leather sheet that is surface treated corresponds to different high temperatures.

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