Edge coating of leather and its process

Abstract

The present invention relates to a leather edge coating process. More specifically, the present invention relates to a process [200] for converting a liquid edge coating into a solid pigment film [205]. More specifically, the present invention relates to a process for converting a liquid edge coating into a solid pigment film [205] on a transparent film and transferring it to the edge of a substrate [207]. In addition, the process of the present invention provides a liquid edge coating transferred to the edge of a substrate for one or more applications.

Description

Technical Field

[0001] The present invention relates to a leather edge coating process. More specifically, the present invention relates to a process of converting a liquid edge coating into a solid pigment film on a transparent film and transferring it to the edge of a substrate. In addition, the process of the present invention provides a liquid edge coating transferred to the edge of a substrate for one or more applications. Advantageously, the present invention effectively saves time and avoids material waste. Background Art

[0002] Generally, in the field of leather processing, edge coloring treatment is a very important stage. Usually, a leather colorer is used to achieve the coloring of leather. The colorer includes an ink cartridge and an ink wheel, and the ink is applied to the surface of the leather during the rotation of the ink wheel.

[0003] What is known in the art is a leather edge coloring process that uses an ink cartridge and a roller assembly. The ink in the ink cartridge is used to achieve the leather coloring operation by rolling the roller of the roller assembly. However, its larger diameter roller is only suitable for traditional shaped leather, and there are certain difficulties in coloring. Using a smaller diameter roller for coloring will make the volume of the ink cartridge smaller, and the coloring roller cannot fully utilize the ink, resulting in waste of ink.

[0004] US5,298,072 describes a system for coating the edges of panels (as well as other types and forms of workpieces). In this system, the panel moves along a conveyor belt passing through a coating station, such that the edge of the panel moves longitudinally through an applicator head that can be used both as a spray head for applying the coating and as a vacuum head for removing excess coating. The shape of the applicator head is complementary to the shape of the edge of the panel. When the panel moves through the applicator head, the coating is applied and the excess coating is removed to leave a smooth finished surface. The problem with this prior art system is that there is an uneven coating of the liquid applied to the workpiece, unnecessary accumulation of the liquid on the components of the system, and high maintenance costs.

[0005] Therefore, there is a need for a simple and effective process that reduces the burden of the difficult edge coating procedure by reducing waste of ink, water, materials, etc., and also further shortens the delivery cycle and saves energy.

[0006] Object of the Invention

[0007] The main object of the present invention is to enhance the edge coating process by adding a new aesthetic appearance to the product.

[0008] Another object of the present invention is to simplify surface cleaning and avoid difficulties in applying the first coating and the second coating.

[0009] Another object of the present invention is to improve the existing edge coating process.

[0010] Another object of the present invention is to use single-color or mixed-color, degenerate color or multi-color in the edge coating process.

[0011] Another object of the present invention is to save time and energy in terms of working, cleaning, applying, heating time for drying, wiping, etc., and reduce waste such as ink, materials, water, etc.

[0012] Another object of the present invention is to provide an edge coloring process, including using heat to paste an edge coating on a transfer paper transferred to a substrate or an edge; and optionally adding a coating with a topcoat composed of matte pigments or bright pigments or coatings.

[0013] Another object of the present invention is to spray a liquid edge coating on a transparent sheet to form a thin layer of solid pigment or coating on the transparent sheet by means of a metal roller.

[0014] Another object of the present invention is to remove the transparent paper after attachment, and use manual tools or a heated surface to trim both sides to achieve a permanent printed attachment.

[0015] Another object of the present invention is to apply an adhesion promoter on the edge side of a leather belt without wiping by hand or roller.

[0016] Another object of the present invention is to dry the leather belt for a predefined time, and after drying, apply a sticker edge coating on the edge of the leather belt.

[0017] Another object of the present invention is to heat the dried leather belt after drying it for a specific time using a heat-controlled roller tool at a predefined temperature for a specific time.

[0018] Another object of the present invention is to cool the heated leather belt for a specific time and remove the sticker edge coating on the edge side.

[0019] Another object of the present invention is to apply a matte topcoat on the sticker edge coating using hand or roller, and store the leather belt in a dry place for a predefined time for drying.

[0020] Another object of the present invention is to apply a bright topcoat using hand or roller, and store the leather belt in a dry place for a predefined time for drying.

[0021] Another object of the present invention is to apply a matte coating or a bright coating by using hand or a roller machine.

[0022] Another object of the present invention is to use manual tools or a machine as an edge spraying tool and a metal roller to make an edge coating sticker. Summary of the Invention

[0023] Various embodiments of the present invention can overcome one or more problems of the traditional prior art.

[0024] The main aspect of the present invention provides a method for edge coloring / edge coating a leather substrate, the method comprising the following steps:

[0025] Wiping the edge of the leather substrate;

[0026] Applying an adhesion promoter in the range of 0.1 mm to 0.3 mm to the edge of the leather substrate;

[0027] And drying at room temperature for 1 minute to 2 minutes;

[0028] Applying the adhesion promoter on the transfer film;

[0029] Pouring a liquid edge coating onto the transfer film to transform it into a solid edge pigment coating as a transfer film; and

[0030] Transferring the edge coating transfer film to the edge of the leather substrate, then applying heat of 110 °C to 130 °C and a pressure of 60 PSI kg / cm 2 to 70 PSI kg / cm 2 and removing the transfer film,

[0031] wherein the edge coating is a liquid, which transforms into a solid colored transfer film when poured onto a transfer film with an adhesion promoter and transfers to the edge of the leather substrate when temperature and pressure are applied.

[0032] Another aspect of the present invention provides a method for edge coloring / edge coating a leather substrate, wherein the adhesion promoter contains aziridine at a concentration of 25% w / v to 35% w / v in softened water.

[0033] Another aspect of the present invention provides a method for edge coloring / edge coating a leather substrate, wherein the thickness range of the solid pigment film on the leather substrate is 0.06 mm to 0.08 mm.

[0034] Another aspect of the present invention provides a method for edge coloring / edge coating a leather substrate, the method comprising the following steps:

[0035] Wiping the edge of the leather substrate;

[0036] Applying the adhesion promoter on the edge of the leather substrate (in a thin layer thickness);

[0037] Drying at room temperature for 1 minute to 2 minutes;

[0038] Applying the adhesion promoter on the transfer film;

[0039] Pour a liquid edge coating onto a transfer film to convert it into a solid edge pigment coating;

[0040] By applying heat at 110°C to 130°C and a pressure of 60 PSI kg / cm 2 to 70 PSI kg / cm 2 transfer the edge coating from the film to the edge of the leather substrate and remove the film; and

[0041] Apply a topcoat,

[0042] wherein the edge coating is a liquid that, when poured onto a transfer film with an adhesion promoter, converts into a solid pigment and, when temperature and pressure are applied, transfers to the edge of the leather substrate.

[0043] Another aspect of the present invention provides a method for edge coloring / edge coating a leather substrate, wherein the topcoat comprises a conventional liquid pigment coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] For a more detailed and otherwise obvious understanding of the features, advantages, and objects of the present invention, reference may be made to the embodiments of the present invention illustrated in the drawings forming a part of this specification. However, it should be noted that the drawings only illustrate the preferred embodiments of the present invention and should not be considered as limiting the scope of the present invention, as other equally effective embodiments are possible.

[0045] Figure 1 : shows a flowchart of a method for edge coloring the edge of a leather substrate according to an embodiment of the present invention

[0046] Figure 2 : shows an unwiped leather belt and sticker edge coating according to an embodiment of the present invention.

[0047] Figure 3 : shows the application of a promoter (first coating) on the edge side according to the present invention

[0048] Figure 4 : shows the application of a promoter (first coating) on the sticker edge coating according to the present invention.

[0049] Figure 5 : shows the attachment of the sticker edge coating to the edge according to the present invention.

[0050] Figure 6 : shows the heat fixation of the edge according to the present invention.

[0051] Figure 7: Shows the removal of the film from the sticker edge coating on the edge side according to the present invention.

[0052] Figure 8 : Shows the trimming of the sticker edge coating according to the present invention.

[0053] Figure 9 : Shows the final picture of the belt after all the processes of the present invention are completed.

[0054] Label description:

[0055]

[200] Method for edge coloring of leather substrate

[0056]

[201] Wipe the edge of the leather substrate

[0057]

[202] Apply an adhesion promoter on the edge of the leather substrate

[0058]

[203] Apply an adhesion promoter on the transfer film

[0059]

[204] Apply a liquid edge coating on the transfer film

[0060]

[205] Form a solid pigment film on the transfer film

[0061]

[206] The edge coating veneer of the transfer film contacts the edge surface of the leather substrate by application

[0062]

[207] When heat and pressure are applied, the pigment film or paint film is transferred from the transfer film to the edge of the substrate.

[0063]

[208] Remove the transfer film to obtain the edge-coated substrate as a finished product. Detailed implementation manner

[0064] It should be understood that the application of the present disclosure is not limited to the structural details and component arrangement structures set forth below or shown in the drawings. The present disclosure can have other embodiments and can be implemented or executed in various ways. In addition, it should be understood that the wording and terms used herein are for the purpose of illustration and should not be construed as limiting.

[0065] The present invention relates to an improved method for leather edge coating applications.

[0066] Edge coatings or pigments for leather are usually liquids, and the prior art processes have described various methods for applying liquid edge coatings or pigments to a leather substrate. The present invention devises a simple, economical and less cumbersome process for applying an edge coating to a leather substrate. The method involves transforming a liquid edge coating into a solid pigment film and applying it to the edge of the leather substrate by applying pressure at a selected temperature such that the cured film is transferred to the edge. Additionally, the present invention is capable of applying the coating or pigment to the edge surface of the substrate to achieve the desired application. Advantageously, the present invention effectively saves time and avoids material waste.

[0067] Reference Figure 1 , which shows a method (200) for edge coloring or edge coating a leather substrate according to an embodiment of the present invention. The leather substrate is any substrate made of leather and requires coating or coloring on its surface. The pigment includes an edge coating or a conventional edge pigment. The method of the present invention provides a solid pigment film for direct adhesion to the edge of the substrate as a rapid edge coating process. The substrate whose surface needs to be colored with an edge coating is wiped (201). An adhesion promoter is applied to the surface of the substrate (202) as a uniform coating and then allowed to dry at room temperature for 1 minute to 2 minutes. An adhesion promoter is applied to the surface of the transfer film (203) as a uniform thin layer with a thickness of 0.1 mm to 0.3 mm, preferably 0.2 mm. The transfer film is made of cellulose acetate.

[0068] Table 1 Characteristics of the liquid pigment to be used:

[0069] Turn to Neutral Base Standard Value Appearance White Viscous Liquid Dry Matter Content % 43+ / -2 pH (1;10) 7.5+ / -1.0 <![CDATA[Density g / cm 2 > 1.05+ / -0.05

[0070] Polyurethane binder and pigment in an aqueous dispersion. It is characterized by low viscosity, fast drying, hard dry film, good hiding power and penetration power. It has excellent adhesion, resistance to dry and wet rubbing, and cold flex resistance. Semi-gloss finished surface, very smooth and sealed in appearance. Depending on the absorption of the leather, it can be applied manually or by machine as one coat or two coats. The attachment of the product to the leather needs to be checked at all times for at least 24 hours after application.

[0071] The liquid pigment to be coated on the surface of the leather substrate is evenly sprayed on the surface of the transfer film (204). It is dried at room temperature for 1 minute to 2 minutes and the pigment cures into a thin layer. Additionally, the liquid layer forms a solid pigment film (205) or an edge pigment film that can be transferred to any surface of the substrate of the present invention. The thickness of the solid edge pigment is 0.06 mm to 0.08 mm and the thickness of the transfer film is 0.05 mm.

[0072] Contact a transfer film having a solid-colored surface with the surface of a substrate to be colored (206, 207) by placing the substrate having the film on the surface and applying heat of 110°C to 130°C and a pressure of 60 PSI kg / cm 2 to 70 PSI kg / cm 2 to the surface. Remove the transfer film or the laminate film, wherein after applying the temperature and pressure, pigment transfer occurs and the colorless film is removed for disposal (208). The adhesion promoter according to an embodiment of the present invention is aziridine having a concentration of 25% w / v to 35% w / v in softened water.

[0073] In one embodiment, the leather substrate after the pigment coating can be enhanced with a matte coating or a gloss coating.

[0074] Example 1

[0075] Regarding edge coloring of the leather substrate edge.

[0076] Obtain a leather substrate. Wipe the edge, and then apply an adhesion promoter with a thickness of about 0.1 mm to 0.3 mm on the edge and dry at room temperature for 1 minute to 2 minutes. Apply an adhesion promoter with a thickness of 0.1 mm to 0.2 mm on the transfer film made of cellulose acetate. Spray a liquid edge coating on the transfer film to convert it into a solid edge pigment coating with a thickness of about 0.06 mm to 0.08 mm and dry in a cool place for 24 hours.

[0077] Spray the liquid edge coating using a No. 5 spray gun. The spray gun should be 13 inches and at an angle of 45 degrees to 60 degrees. After spraying, it should be dried in a cool place for 24 hours, not in direct sunlight. The transfer film is now converted into a solid pigment laminate for transferring the edge pigment onto the substrate.

[0078] Transfer from the transparent paper to the edge of the substrate material. In addition, the process of the present invention provides a liquid edge coating transferred to the substrate edge for one or more applications. In the process of making the liquid edge pigment into a sticker sheet, we can make different types of textures and finished surfaces, such as matte finished surfaces and gloss finished surfaces. All these finishes can be carried out when reserved. The thickness of the sticker edge coating should be 0.06 mm to 0.08 mm. When spraying, there should be no bubbles on the spraying surface, as bubbles will cause the surface to be uneven.

Claims

1. A method for edge coating a leather substrate, comprising the following steps: Wiping the edge of the leather substrate; Applying an adhesion promoter in the range of 0.1 mm to 0.3 mm on the edge of the leather substrate and drying it at room temperature for 1 minute to 2 minutes; Applying the adhesion promoter on a transfer film with a thickness of 0.1 mm to 0.3 mm; Spraying or pouring a liquid edge coating onto the transfer film with the adhesion promoter to convert it into a solid edge pigment coating as a solid pigment film; and Transfer the solid pigment film to the edge of the leather substrate, then apply heat at 110°C to 130°C and pressure of 60 PSI kg / cm 2 to 70 PSI kg / cm 2 and remove the transfer film. Wherein, the edge coating is a liquid, containing a polyurethane binder and a pigment, which is converted into a solid pigment film when poured onto the transfer film with the adhesion promoter and transferred to the edge of the leather substrate when temperature and pressure are applied; Wherein, the thickness range of the solid pigment film on the leather substrate is 0.06 mm to 0.08 mm.

2. The method for edge coating a leather substrate according to claim 1, wherein the adhesion promoter contains aziridine with a concentration of 25% w / v to 35% w / v in softened water.

3. A method for edge coating a leather substrate, comprising the following steps: Wiping the edge of the leather substrate; Applying an adhesion promoter with a thickness of 0.1 mm to 0.3 mm on the edge of the leather substrate and drying it at room temperature for 1 minute to 2 minutes; Applying the adhesion promoter on a transfer film with a thickness of 0.1 mm to 0.3 mm; Spraying or pouring a liquid edge coating onto the transfer film to convert the liquid edge coating into a solid edge pigment coating with a thickness of 0.06 mm to 0.08 mm and drying it in a cool place for 24 hours as a solid pigment film; By applying heat of 110 °C to 130 °C and a pressure of 60 PSI kg / cm 2 to 70 PSI kg / cm 2 the solid pigment film is transferred from the transfer film to the edge of the leather substrate, and the transfer film is removed; And Applying a topcoat, Wherein, the edge coating is a liquid, containing a polyurethane binder and a pigment, which is converted into a solid pigment film when poured onto the transfer film with the adhesion promoter and transferred to the edge of the leather substrate when temperature and pressure are applied.

4. The method for edge coating of a leather substrate according to claim 3, wherein, The topcoat includes a conventional liquid pigment coating.

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