Leather trademarks and their manufacturing methods

Abstract

This invention relates to a leather trademark and its manufacturing method. The manufacturing method includes the following steps: Base preparation: applying ink or screen printing it onto the outer surface of the leather, drying it to form an adhesive reinforcement layer on the outer surface, thus forming a base; Cutting: cutting the base according to the trademark pattern to form a preliminary product; Pressing: placing a hot melt adhesive film and a decorative film sequentially from bottom to top to form a composite film layer, placing the composite film layer on a mold with the trademark pattern, and using a high-frequency welding process to press and melt the composite film layer to form a composite trademark; and Laminating: placing the composite trademark on the preliminary product, aligning and overlapping the hot melt adhesive film and the adhesive reinforcement layer, and laminating them on the mold to obtain the leather trademark. The leather trademark decorative film prepared using this method adheres firmly to the leather surface and is not prone to delamination during washing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a leather trademark and a manufacturing method thereof. BACKGROUND

[0002] Trademarks play an important role in clothing, hats and shoes, and various styles of luggage products. High-quality trademarks can show the beauty and level of products. Trademarks made of real leather or synthetic leather are very common. The traditional manufacturing method of leather trademarks is usually to directly paste hot melt adhesive or silk-screen hot melt adhesive on the surface of the leather to achieve the bonding between the leather and the decorative film. However, the surface material of good leather has high cross-linking density, and is resistant to scratching, wear and solvent. Moreover, during the process of hot bonding the trademark, the hot melt adhesive will be re-melted. The original hot melt adhesive, which has not penetrated much, will go through the process of wetting and penetration again. In a short operation time, the penetration depth of the hot melt adhesive on the surface of the leather is limited, which makes it difficult for the hot melt adhesive to stick firmly, and causes the trademark to separate from the leather during washing. SUMMARY

[0003] In view of the problem of poor adhesion of the decorative film on the surface of the leather in the traditional technology, the present application provides a leather trademark and a manufacturing method thereof. The leather trademark prepared by the manufacturing method has firm adhesion of the decorative film on the surface of the leather, and is not easy to separate during washing.

[0004] The first aspect of the present application provides a manufacturing method of a leather trademark, comprising the following steps:

[0005] Bottoming: applying or silk-screening ink on the outer surface of the leather, and drying to form a bonding strengthening layer on the outer surface to form a base;

[0006] Cutting: cutting the base according to the trademark pattern to form a preliminary product;

[0007] Trademark pressing: placing the hot melt adhesive film and the decorative film in order from bottom to top to form a composite film layer, placing the composite film layer on a mold with a trademark pattern, and pressing and fusing the composite film layer by using high-frequency technology to form a composite trademark; and

[0008] Bonding: placing the composite trademark on the preliminary product, and aligning and bonding the hot melt adhesive film and the bonding strengthening layer on the mold to obtain the leather trademark.

[0009] In some embodiments, the ink is polyurethane transparent ink.

[0010] In some embodiments, the ink is prepared from the following raw materials by mass:

[0011] Polyurethane resin 40-70 parts;

[0012] Diluent 20-59 parts;

[0013] 1 to 3 parts of isocyanate curing agent.

[0014] In some embodiments, the diluent is acetone, butanone, cyclopentanone, cyclohexanone, or methyl isobutyl ketone.

[0015] In some implementations, the diluent is cyclohexanone.

[0016] In some embodiments, the ink is made from the following raw materials in parts by weight:

[0017] 60-70 parts of polyurethane resin;

[0018] Cyclohexanone 20-40 parts;

[0019] 1 to 3 parts of isocyanate curing agent.

[0020] In some embodiments, the ink is made from the following raw materials in parts by weight:

[0021] 67 parts of polyurethane resin;

[0022] 30 parts of cyclohexanone;

[0023] 3 parts isocyanate curing agent.

[0024] In some embodiments, the drying temperature is 110°C to 150°C, and / or the drying time is 5 min to 10 min.

[0025] In some embodiments, the thickness of the adhesive reinforcement layer is 0.01 mm to 0.05 mm, and / or the melting point of the adhesive reinforcement layer is 200°C to 250°C.

[0026] In some embodiments, the leather is water-based polyurethane synthetic leather or solvent-free polyurethane synthetic leather. Both water-based and solvent-free polyurethane synthetic leathers are environmentally friendly and do not contain toxic or harmful components such as dimethylformamide (DMFa) or toluene.

[0027] In some implementations, the cutting step employs cold die cutting or laser cutting.

[0028] In some embodiments, the hot melt adhesive film is one or more of TPU, PES or EVA materials, and / or the melting point of the hot melt adhesive film is 80°C to 160°C and the thickness is 0.1mm to 0.2mm.

[0029] In some embodiments, the decorative film is one or more of TPU, PVC or EVA materials, and / or the melting point of the decorative film is above 220°C and the thickness is 0.1 mm to 3 mm.

[0030] In some implementations, a high-frequency bonding process is used for alignment during the bonding step, with a pressure of 1.0 kgf / cm². 2 ~5.0Kgf / cm 2 The time is 0.5s to 3.0s, the temperature is 50℃ to 80℃, and the current is 1.0mA to 4.0mA.

[0031] In some embodiments, the bonding step employs a flatbed heat pressing process for alignment and bonding, with a pressure of 1.0 kgf / cm². 2 ~5.0Kgf / cm 2 The time is 10s to 20s, and the temperature is 80℃ to 180℃.

[0032] In some embodiments, the leather trademarks produced by the above preparation method can be used by sewing.

[0033] In some embodiments, an adhesive backing step is included before the cutting step, whereby a hot melt adhesive film is adhered to the inner surface of the leather. Leather trademarks produced using this method can be used by heat pressing.

[0034] In some embodiments, the hot melt adhesive film used in the backing adhesive step is one or more of TPU, PES or EVA materials, and / or the hot melt adhesive film has a melting point of 80°C to 160°C and a thickness of 0.1 mm to 0.2 mm.

[0035] A second aspect of the present invention provides a leather trademark, which is prepared using the leather trademark manufacturing method of the first aspect.

[0036] A third aspect of the present invention provides a leather trademark, which sequentially includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer.

[0037] The aforementioned method for manufacturing leather trademarks involves adding an adhesive reinforcement layer between the leather and the hot melt adhesive film. This reinforcement layer is a high-temperature resistant solvent-based polyurethane. The solvent components in this layer have low surface tension, easily wetting the leather surface. Simultaneously, the small solvent molecules have strong penetrating power and can partially solvate the fat-soluble segments of the polyurethane molecules in the leather, thereby improving the compatibility between the polyurethane molecules in the reinforcement layer and those in the leather. This allows the polyurethane molecules in the reinforcement layer to penetrate the leather surface, achieving molecular-level entanglement. After drying, the reinforcement layer firmly adheres to the leather surface. During the trademark application process, the reinforcement layer does not melt, but only has slight surface fluidity, allowing the hot melt adhesive to penetrate into and adhere firmly to it. The reinforcement layer and the leather surface remain in a solid phase, and the penetration layer between them is not damaged. The leather trademark decorative film prepared using this method adheres firmly to the leather surface and is not prone to delamination during washing.

[0038] The above-mentioned method for manufacturing leather trademarks involves a very thin adhesive reinforcement layer, requires a small amount, is easy to dry, leaves no solvent residue, and ensures that the impact of volatile organic compounds (VOCs) on the production environment complies with relevant national environmental protection requirements. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0040] To gain a more complete understanding of the present invention and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0041] Figure 1 These are schematic diagrams of the leather trademarks prepared in Examples 1, 3, and 4 of this invention.

[0042] Figure 2 This is a schematic diagram of the structure of the leather trademark prepared in Example 2 of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the leather trademark prepared in Comparative Example 1 of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of the leather trademark prepared in Comparative Example 2 of the present invention. Detailed Implementation

[0045] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0047] In this invention, if the unit of a data range is only followed by the right endpoint, it indicates that the units of the left and right endpoints are the same. For example, 110~150℃ means that the units of the left endpoint "110" and the right endpoint "150" are both in degrees Celsius (℃).

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0049] This invention provides a method for manufacturing a leather trademark, comprising the following steps:

[0050] Primer: Apply ink or screen print it onto the outer surface of the leather, dry it, and form an adhesive reinforcement layer on the outer surface to form a base;

[0051] Cutting: The base is cut according to the trademark pattern to form a preliminary product;

[0052] Embossing: Hot melt adhesive film and decorative film are arranged in order from bottom to top to form a composite film layer. The composite film layer is placed on a mold with a trademark pattern, and a high-frequency process is used to press and melt the composite film layer to form a composite trademark; and

[0053] Lamination: The composite trademark is placed on the primary product, the hot melt adhesive film and the adhesive reinforcement layer are aligned and overlapped, and then aligned and laminated on the mold to obtain the leather trademark.

[0054] like Figures 1-2As shown, the leather trademark produced by the above-mentioned method includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer. The decorative film layer may contain graphic information, textures, and other different trademark appearance design effects.

[0055] In some embodiments, the ink used in the priming step is a highly penetrating, high-temperature resistant solvent-based polyurethane material; for example, the ink is a transparent polyurethane ink.

[0056] In some embodiments, the ink is made from the following raw materials in parts by weight:

[0057] 40-70 parts of polyurethane resin;

[0058] 20-59 parts of diluent;

[0059] 1 to 3 parts of isocyanate curing agent.

[0060] In some embodiments, the diluent may be acetone, butanone, cyclopentanone, cyclohexanone, or methyl isobutyl ketone. Further, the diluent is cyclohexanone.

[0061] In some embodiments, the ink is made from the following raw materials in parts by weight:

[0062] 60-70 parts of polyurethane resin;

[0063] Cyclohexanone 20-40 parts;

[0064] 1 to 3 parts of isocyanate curing agent.

[0065] In some embodiments, the ink is made from the following raw materials in parts by weight:

[0066] 67 parts of polyurethane resin;

[0067] 30 parts of cyclohexanone;

[0068] 3 parts isocyanate curing agent.

[0069] In some embodiments, ink is applied to the entire surface or screen-printed onto the leather surface using a label-printed screen.

[0070] In some embodiments, the leather can be genuine leather or synthetic leather. Further, the synthetic leather can be water-based polyurethane synthetic leather or solvent-free polyurethane synthetic leather. Both water-based polyurethane synthetic leather and solvent-free polyurethane synthetic leather are environmentally friendly, containing no toxic or harmful components such as dimethylformamide (DMFa) or toluene, making them more environmentally friendly.

[0071] In some embodiments, the drying temperature in the base coat step is 110°C to 150°C, and / or the drying time is 5 min to 10 min.

[0072] In some embodiments, the drying temperature in the base coat step is 120°C, and / or the drying time is 5 minutes.

[0073] In some embodiments, during the priming step, the thickness of the adhesive reinforcement layer is 0.01 mm to 0.05 mm, and / or the melting point of the adhesive reinforcement layer is 200°C to 250°C.

[0074] In some embodiments, during the priming step, the thickness of the adhesive reinforcement layer is 0.02 mm to 0.04 mm, and / or the melting point of the adhesive reinforcement layer is 200°C to 250°C.

[0075] In some embodiments, during the priming step, the thickness of the adhesive reinforcement layer is 0.03 mm, and / or the melting point of the adhesive reinforcement layer is 200°C to 250°C.

[0076] In some implementations, the cutting step employs cold die cutting or laser cutting.

[0077] In some embodiments, during the marking step, the hot melt adhesive film is one or more of TPU, PES, or EVA materials, and / or the melting point of the hot melt adhesive film is 80°C to 160°C, and the thickness is 0.1mm to 0.2mm.

[0078] In some embodiments, the hot melt adhesive film is made of TPU material with a melting point of 95°C and a thickness of 0.1 mm.

[0079] In some embodiments, the hot melt adhesive film is made of PES material with a melting point of 120°C and a thickness of 0.1 mm.

[0080] In some embodiments, the decorative film is one or more of TPU, PVC or EVA materials, and / or the melting point of the decorative film is above 220°C and the thickness is 0.1 mm to 3 mm.

[0081] In some embodiments, the decorative film is made of TPU material with a melting point above 220°C and a thickness of 0.5 mm to 1.5 mm. Further, the decorative film has a melting point above 250°C and a thickness of 1 mm.

[0082] In some embodiments, the pressure of the high-frequency process in the marking step is 1.0 kgf / cm². 2 ~5.0Kgf / cm 2The time ranges from 0.5s to 3.0s, the temperature from 50℃ to 80℃, and the current from 1.0mA to 4.0mA. Furthermore, the pressure of the high-frequency process is 2.0 kgf / cm². 2 ~3.0Kgf / cm 2 The time is 1s to 2.5s, the temperature is 70℃ to 80℃, and the current is 2.0mA to 3.0mA. Furthermore, the pressure of the high-frequency process is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0083] In some embodiments, the bonding step employs a flatbed heat pressing process for alignment and bonding, with a pressure of 1.0 kgf / cm². 2 ~5.0Kgf / cm 2 The time is 10s to 20s, and the temperature is 80℃ to 180℃.

[0084] In some embodiments, the bonding step employs a high-frequency process for alignment and bonding, with a pressure of 1.0 kgf / cm². 2 ~5.0Kgf / cm 2 The time ranges from 0.5s to 3.0s, the temperature from 50℃ to 80℃, and the current from 1.0mA to 4.0mA. Furthermore, the pressure of the high-frequency process is 2.0 kgf / cm². 2 ~3.0Kgf / cm 2 The time is 1s to 2.5s, the temperature is 70℃ to 80℃, and the current is 2.0mA to 3.0mA. Furthermore, the pressure of the high-frequency process is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0085] In some embodiments, the leather trademarks produced by the above preparation method can be used by sewing.

[0086] In some embodiments, the method for making a leather trademark further includes the following steps:

[0087] Adhesive backing: Applying a hot melt adhesive film to the inner surface of the leather. This adhesive backing step occurs before the cutting step.

[0088] In some embodiments, the hot melt adhesive film used in the backing adhesive step is one or more of TPU, PES or EVA materials, with a melting point of 80°C to 160°C and a thickness of 0.1 mm to 0.2 mm.

[0089] In some embodiments, the hot melt adhesive film used in the backing adhesive step is a TPU material, and / or the hot melt adhesive film has a melting point of 90°C to 100°C and a thickness of 0.1 mm to 0.15 mm. Further, the hot melt adhesive film has a melting point of 95°C and a thickness of 0.1 mm.

[0090] In some embodiments, during the backing step, a hot melt adhesive film is bonded to the inner surface of the leather on a laminating machine.

[0091] In some embodiments, the method for making a leather trademark includes the following steps:

[0092] Adhesive backing: Applying hot melt adhesive film to the inner surface of the leather;

[0093] Primer: Apply ink or screen print it onto the outer surface of the already adhesive-backed leather, dry it, and form an adhesive reinforcement layer on the outer surface to form a base;

[0094] Cutting: The base is cut according to the trademark pattern to form a preliminary product;

[0095] Labeling: Hot melt adhesive film and decorative film are arranged neatly from bottom to top to form a composite film layer. The composite film layer is placed on a mold with the trademark pattern, and a high-frequency process is used to press and melt the composite film layer to form a composite trademark; and

[0096] Lamination: The composite trademark is placed on the primary product, the hot melt adhesive film and the adhesive reinforcement layer are aligned and overlapped, and then aligned and laminated on the mold to obtain the leather trademark.

[0097] The leather trademarks produced by this method can be used by heat pressing.

[0098] This invention provides a leather trademark, which is prepared using the above-described method for making leather trademarks.

[0099] The present invention provides a leather trademark, which sequentially includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer.

[0100] The method for manufacturing leather trademarks provided by this invention involves adding an adhesive reinforcement layer between the leather and a hot melt adhesive film. This reinforcement layer is a high-temperature resistant solvent-based polyurethane. The solvent components in this layer have low surface tension, easily wetting the leather surface. Simultaneously, the small solvent molecules have strong penetrating power and can partially solvate the fat-soluble segments of the polyurethane molecules in the leather, thereby improving the compatibility between the polyurethane molecules in the reinforcement layer and those in the leather. This allows the polyurethane molecules in the reinforcement layer to penetrate the leather surface, achieving molecular-level entanglement. After drying, the reinforcement layer firmly adheres to the outer surface of the leather. During the trademark application process, the reinforcement layer does not melt, but only has slight surface fluidity, allowing the hot melt adhesive to penetrate into and adhere firmly to the reinforcement layer. The reinforcement layer and the outer surface of the leather remain in a solid phase, and the penetration layer between them is not damaged. The leather trademark decorative film prepared using this method adheres firmly to the leather surface and is not prone to delamination during washing.

[0101] The method for manufacturing leather trademarks provided by this invention has a very thin adhesive reinforcement layer, requires a small amount, is easy to dry, leaves no solvent residue, and the impact of volatile organic compounds (VOCs) on the production environment complies with relevant national environmental protection requirements.

[0102] The embodiments of the present invention will now be described in detail with reference to examples.

[0103] The raw materials used in the following embodiments are as follows:

[0104] Zhongshan Zhongyi Ink Co., Ltd.; 3D Gold Oil

[0105] Covestro Polymers (China) Co., Ltd. N3900 isocyanate curing agent.

[0106] TPU hot melt adhesive film Dongguan Mingshuo New Materials Co., Ltd.

[0107] TPU decorative film Dongguan Chengxi New Material Co., Ltd.

[0108] PES hot melt adhesive film Shenzhen Haotemei Plastic Products Co., Ltd.

[0109] Example 1

[0110] A leather trademark, such as Figure 1 As shown, it includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer.

[0111] The leather trademark is prepared by the following method:

[0112] Base coat: The ink is screen-printed onto the outer surface of the water-based polyurethane synthetic leather using a screen printing plate with the trademark, and then dried. The drying temperature is controlled at 120℃ and the drying time is 5 minutes. An adhesive reinforcement layer is formed on the outer surface of the leather to form a base. The thickness of the adhesive reinforcement layer is 0.03mm.

[0113] The ink used in this step is made from the following raw materials in parts by weight:

[0114] 67 portions of 3D gold oil

[0115] 30 parts of cyclohexanone

[0116] 3 parts of N3900 isocyanate curing agent.

[0117] Cutting: The base is aligned and cold-cut according to the trademark pattern to form the initial product.

[0118] Imprinting: TPU hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The TPU hot melt adhesive film has a melting point of 95℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0119] Lamination: The composite trademark is placed on the preliminary product, and the TPU hot melt adhesive film and adhesive reinforcement layer are aligned and overlapped. A high-frequency welding process is then used on a mold for alignment and lamination to obtain the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0120] The leather trademarks produced by this method can be used by sewing.

[0121] Example 2

[0122] A leather trademark, such as Figure 2 As shown, it includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, a leather layer, and a hot melt adhesive film layer.

[0123] The leather trademark is prepared by the following method:

[0124] Adhesive backing: The TPU hot melt adhesive film is bonded to the solvent-free polyurethane synthetic leather on a laminating machine. The TPU hot melt adhesive film is bonded to the inner surface of the solvent-free polyurethane synthetic leather. The melting point of the TPU hot melt adhesive film is 95℃, and the thickness is 0.1mm. Laminating machine parameters: pressure 1.5Kgf / cm 2The time was 10 seconds and the temperature was 120℃.

[0125] Base coat: The ink is screen-printed onto the outer surface of the solvent-free polyurethane synthetic leather with adhesive backing using a screen printing plate with the trademark. It is then dried at a temperature of 120°C for 5 minutes to form an adhesive reinforcement layer on the outer surface of the synthetic leather, thus forming a base. The thickness of this adhesive reinforcement layer is 0.03 mm.

[0126] The ink used in this step is made from the following raw materials in parts by weight:

[0127] 67 portions of 3D gold oil

[0128] 30 parts of cyclohexanone

[0129] 3 parts of N3900 isocyanate curing agent.

[0130] Cutting: The base is aligned and cold-cut according to the trademark pattern to form the initial product;

[0131] Imprinting: PES hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The PES hot melt adhesive film has a melting point of 120℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0132] Lamination: The composite trademark is placed on the preliminary product, and the PES hot melt adhesive film and adhesive reinforcement layer are aligned and overlapped. A high-frequency welding process is used on a mold for alignment and lamination to obtain the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0133] The leather trademarks produced by this method can be used by hot pressing.

[0134] Example 3

[0135] A leather trademark, such as Figure 1 As shown, it includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer.

[0136] The leather trademark is prepared by the following method:

[0137] Base coat: The ink is screen-printed onto the outer surface of the water-based polyurethane synthetic leather using a screen printing plate with the trademark, and then dried. The drying temperature is controlled at 120℃ and the drying time is 5 minutes. An adhesive reinforcement layer is formed on the outer surface of the synthetic leather, forming a base. The thickness of the adhesive reinforcement layer is 0.03mm.

[0138] The ink used in this step is made from the following raw materials in parts by weight:

[0139] 40 portions of 3D gold oil

[0140] 20 parts of cyclohexanone

[0141] 1 part of N3900 isocyanate curing agent.

[0142] Cutting: The base is aligned and cold-cut according to the trademark pattern to form the initial product.

[0143] Imprinting: TPU hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The TPU hot melt adhesive film has a melting point of 95℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0144] Lamination: The composite trademark is placed on the preliminary product, and the TPU hot melt adhesive film and adhesive reinforcement layer are aligned and overlapped. A high-frequency welding process is then used on a mold for alignment and lamination to obtain the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0145] The leather trademarks produced by this method can be used by sewing.

[0146] Example 4

[0147] A leather trademark, such as Figure 1 As shown, it includes a decorative film layer, a hot melt adhesive film layer, an adhesive reinforcement layer, and a leather layer.

[0148] The leather trademark is prepared by the following method:

[0149] Base coat: The ink is screen-printed onto the outer surface of the water-based polyurethane synthetic leather using a screen printing plate with the trademark, and then dried. The drying temperature is controlled at 120℃ and the drying time is 5 minutes. An adhesive reinforcement layer is formed on the outer surface of the synthetic leather, forming a base. The thickness of the adhesive reinforcement layer is 0.03mm.

[0150] The ink used in this step is made from the following raw materials in parts by weight:

[0151] 70 portions of 3D gold oil

[0152] 59 parts of cyclohexanone

[0153] 3 parts of N3900 isocyanate curing agent.

[0154] Cutting: The base is aligned and cold-cut according to the trademark pattern to form the initial product.

[0155] Imprinting: TPU hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The TPU hot melt adhesive film has a melting point of 95℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0156] Lamination: The composite trademark is placed on the preliminary product, and the TPU hot melt adhesive film and adhesive reinforcement layer are aligned and overlapped. A high-frequency welding process is then used on a mold for alignment and lamination to obtain the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0157] The leather trademarks produced by this method can be used by sewing.

[0158] Comparative Example 1

[0159] A leather trademark, such as Figure 3 As shown, it includes a decorative film layer, a hot melt adhesive film layer, and a leather layer.

[0160] The leather trademark is prepared by the following method:

[0161] Cutting: The water-based polyurethane synthetic leather is cold-cut according to the trademark pattern to form the initial product.

[0162] Imprinting: TPU hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The TPU hot melt adhesive film has a melting point of 95℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0163] Lamination: The composite trademark is placed on the preliminary product, and the outer surfaces of the TPU hot melt adhesive film and the water-based polyurethane synthetic leather are aligned and overlapped. A high-frequency welding process is used on a mold for alignment and lamination to obtain the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0164] The leather trademarks produced by this method can be used by sewing.

[0165] Comparative Example 2

[0166] A leather trademark, such as Figure 4 As shown, it includes a decorative film layer, a hot melt adhesive film layer, a leather layer, and a hot melt adhesive film layer.

[0167] The leather trademark is prepared by the following method:

[0168] Adhesive backing: The TPU hot melt adhesive film is bonded to the solvent-free polyurethane synthetic leather on a laminating machine. The TPU hot melt adhesive film is bonded to the inner surface of the solvent-free polyurethane synthetic leather. The melting point of the TPU hot melt adhesive film is 95℃, and the thickness is 0.1mm. Laminating machine parameters: pressure 1.5Kgf / cm 2 The time was 10 seconds and the temperature was 120℃.

[0169] Cutting: The solvent-free polyurethane synthetic leather with adhesive backing on the inner surface is aligned and cold-cut according to the trademark pattern to form the initial product;

[0170] Imprinting: PES hot melt adhesive film and TPU decorative film are arranged neatly from bottom to top to form a composite film layer. This composite film layer is placed on a mold with the trademark pattern, and a high-frequency welding process is used to press and melt the composite film layer, forming a composite trademark. The PES hot melt adhesive film has a melting point of 120℃ and a thickness of 0.1mm. The TPU decorative film has a melting point above 250℃ and a thickness of 1mm. The high-frequency imprinting pressure is 3.0Kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0171] Lamination: The composite trademark is placed on the primary product, with the outer surfaces of the PES hot melt adhesive film and the solvent-free polyurethane synthetic leather aligned and bonded using a high-frequency welding process on a mold, thus producing the leather trademark. The pressure of the high-frequency welding process is 3.0 kgf / cm². 2 The time was 2.0s, the temperature was 75℃, and the current was 2.5mA.

[0172] The leather trademarks produced by this method can be used by hot pressing.

[0173] Performance testing experiment

[0174] Test method: The leather trademarks prepared in Examples 1-4 and Comparative Examples 1-2 were sewn or pressed onto the fabric, washed 10 times in a washing machine at a water temperature of 40℃, and then removed and dried. The presence of delamination between the composite trademark and the synthetic leather was observed, and the adhesion strength between the composite trademark and the leather was tested. The test results are shown in Table 1 below.

[0175] Table 1

[0176]

[0177]

[0178] As shown in the test results in Table 1 above, the leather trademarks prepared using the method provided by this invention exhibit stable quality, and no delamination occurred after 10 washes in a washing machine. Furthermore, the adhesion strength data indicates that neither TPU nor PES hot melt adhesive films provide ideal adhesion to synthetic leather. However, by employing the method of this invention, which adds an adhesive reinforcement layer between the hot melt adhesive film and the synthetic leather, the reinforcement layer can adhere firmly to both the synthetic leather and the hot melt adhesive film, thus solving the problem of unreliable adhesion of the decorative film to the leather surface in traditional methods.

[0179] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0180] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method of making a leather trademark, characterized by, The method comprises the following steps: priming: applying or silk-screening ink on the outer surface of the leather, drying to form an adhesion strengthening layer on the outer surface, forming a base; cutting: cutting the base according to the trademark pattern to form a preliminary product; pressing the trademark: sequentially placing a hot melt adhesive film and a decorative film from bottom to top to form a composite film layer, placing the composite film layer on a mold with a trademark pattern, and pressing and fusing the composite film layer by using a high-frequency process to form a composite trademark; and attaching: placing the composite trademark on the preliminary product, aligning the hot melt adhesive film and the adhesion strengthening layer, and attaching on the mold to obtain the leather trademark. The ink is a polyurethane transparent ink. The ink is prepared from the following raw materials by mass: polyurethane resin 40-70 parts; diluent 20-59 parts; isocyanate curing agent 1-3 parts.

2. The method of manufacturing according to claim 1, wherein, The diluent is acetone, butanone, cyclopentanone, cyclohexanone, or methyl isobutyl ketone.

3. The method of claim 1, wherein The adhesion strengthening layer has a thickness of 0.01-0.05 mm and / or a melting point of 200-250°C.

4. The method of making of claim 1, wherein, The leather is a water-based polyurethane synthetic leather or a solvent-free polyurethane synthetic leather.

5. The method of making of claim 1, wherein, The hot melt adhesive film is one or more of TPU, PES, or EVA materials, and / or has a melting point of 80-160°C and a thickness of 0.1-0.2 mm.

6. The method of making of claim 1, wherein, The decorative film is one or more of TPU, PVC, or EVA materials, and / or has a melting point of 220°C or higher and a thickness of 0.1-3 mm.

7. The method according to any one of claims 1 to 6, characterized in that The alignment and bonding is performed by a high frequency process, and the pressure of the high frequency process is 1.0 Kgf / cm 2 ~ 5.0 Kgf / cm 2 and the time is 0.5 s ~ 3.0 s, the temperature is 50 °C ~ 80 °C, and the current is 1.0 mA ~ 4.0 mA.

8. The method of any one of claims 1 to 6, wherein, The alignment pasting is performed by using a flat-pressing process, and the flat-pressing process has a pressure of 1.0 Kgf / cm 2 ~ 5.0 Kgf / cm 2 and a time of 10 s ~ 20 s and a temperature of 80 °C ~ 180 °C.

9. The manufacturing method according to any one of claims 1-6, wherein a back adhesive step of attaching a hot melt adhesive film to the inner surface of the leather is further included before the cutting step.

10. A leather trademark prepared by the manufacturing method according to any one of claims 1-9. The leather trademark sequentially comprises a decorative film layer, a hot melt adhesive film layer, an adhesion strengthening layer, and a leather layer.

11. A leather trademark, characterized by The adhesion strengthening layer comprises a polyurethane transparent ink prepared from the following raw materials by mass: polyurethane resin 40-70 parts; diluent 20-59 parts; isocyanate curing agent 1-3 parts. ​

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