Leather-coated ceiling, preparation method thereof and vehicle

Abstract

The invention provides a genuine leather coated ceiling, a preparation method thereof and a vehicle, and belongs to the technical field of vehicle parts. The genuine leather coated ceiling comprises a genuine leather fabric layer, a binder layer and a skeleton layer, the genuine leather fabric layer is adhered to the surface of the skeleton layer through the binder layer, the genuine leather fabric layer is composed of a plurality of genuine leather fabrics which are spliced and sewn together, a sewing groove is formed in the surface of the skeleton layer, and a sewing area of the genuine leather fabric layer is located in the sewing groove; according to the leather-coated ceiling provided by the embodiment of the invention, the defects that the leather fabric layer and the framework layer are not firmly bonded and crack can be overcome, meanwhile, the leather-coated ceiling is matched with other leather-coated parts, the overall texture and touch sense of a vehicle are improved, meanwhile, various different leather fabrics can be utilized for coating, and diversity is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle components, and in particular to a leather-covered ceiling, a preparation method thereof, and a vehicle. Background Art

[0002] With the widespread popularity of automobiles, after vehicles meet people's travel needs, there is also a higher demand for the diversity of vehicle interiors. Therefore, vehicle interiors begin to adopt large-area INS (INSert-Mould-Decoration), coating or electroplating and other surface treatments to meet customer needs.

[0003] The vehicle interior ceiling is one of the important and indispensable interior parts of the vehicle. It is not only a functional component with high requirements, but also needs to have a decorative effect. However, the vehicle ceilings on the market are generally formed by hot pressing or vacuum suction molding, and the touch and texture need to be improved.

[0004] Leather material has the advantages of soft and delicate touch and easy maintenance. At present, some parts of vehicles have been widely made of leather, such as vehicle steering wheels, seats, door panels or instrument panels. However, due to the large size and complex surface of the vehicle roof, and the poor tensile ductility of leather, if the leather is used to cover the roof, there will be problems such as surface accumulation, wrinkles, or poor adhesion between the leather and the base material, and debonding. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a leather-covered ceiling, a preparation method thereof, and a vehicle.

[0006] In a first aspect, the present invention provides a leather-covered ceiling, the leather-covered ceiling comprising a leather fabric layer, an adhesive layer and a skeleton layer, the leather fabric layer being adhered to the surface of the skeleton layer through the adhesive layer, wherein:

[0007] The leather fabric layer is composed of a plurality of leather fabrics that are spliced ​​and sewn together, and a suture groove is arranged on the surface of the skeleton layer, and the sewing area of ​​the leather fabric layer is located in the suture groove.

[0008] In some embodiments of the present invention, the width of the suture groove is 2.5-3 times the thickness of the leather fabric layer.

[0009] In some embodiments of the present invention, the depth of the suture groove is 1.5-2 times the cutting width of the sewing area.

[0010] In some embodiments of the present invention, the suture groove is at least arranged at the profiled surface of the skeleton layer, or at a position where the tensile deformation rate of the leather fabric layer exceeds 10-15%.

[0011] In some embodiments of the present invention, the skeleton layer is provided with a skylight hole, and the suture groove is provided at the seam where the leather covering the four rounded corners of the skylight hole extends forward or backward and is connected with another piece of leather, as well as at the seam between the two pieces of leather in the area corresponding to the skylight hole and the B-pillar of the vehicle, and at the seam between the two pieces of leather in the area corresponding to the roof and the B-pillar.

[0012] In some embodiments of the present invention, the skeleton layer is integrally pressed and formed.

[0013] In some embodiments of the present invention, the plurality of leather fabrics are cut according to the tensile deformation rate of the leather fabric layer.

[0014] In some embodiments of the present invention, the binder layer is a water-soluble adhesive layer.

[0015] In some embodiments of the present invention, the skeleton layer is a polyurethane composite board layer, which includes a polyurethane board, and reinforced glass fiber layers are arranged on both sides of the polyurethane board. The reinforced glass fiber layers include a glass fiber surface felt layer and a non-woven fabric layer, and the glass fiber surface felt layer is located between the non-woven fabric layer and the polyurethane board.

[0016] In some embodiments of the present invention, the thickness of the leather fabric layer is 0.5-1.5 mm.

[0017] In some embodiments of the present invention, the thickness of the adhesive layer is 0.1-0.15 mm.

[0018] In some embodiments of the present invention, the thickness of the skeleton layer is 2.5-6.0 mm.

[0019] In a second aspect, the present invention provides a method for preparing the leather-covered ceiling according to the first aspect, the method comprising the following steps:

[0020] (1) splicing and sewing a plurality of genuine leather fabrics to obtain a genuine leather fabric layer;

[0021] (2) forming a suture groove on the surface of the skeleton layer close to the leather fabric layer;

[0022] (3) The leather fabric layer is adhered to the surface of the skeleton layer by using an adhesive layer, wherein the sewing area of ​​the leather fabric layer is arranged in the suture groove to obtain the leather-covered ceiling.

[0023] In some embodiments of the present invention, in step (1), based on the tensile deformation rate of the leather fabric layer, the areas subjected to a tensile deformation rate greater than the maximum tensile deformation rate of the leather fabric itself are cut to obtain the plurality of leather fabrics.

[0024] In some embodiments of the present invention, the width of the suture groove is 2.5-3 times the thickness of the leather fabric layer, and the depth is 1.5-2 times the cutting width of the sewing area.

[0025] In some embodiments of the present invention, the method of adhering comprises first performing hot pressing and then performing cold pressing.

[0026] In a third aspect, the present invention provides a vehicle, comprising the leather-covered ceiling described in the first aspect, or the leather-covered ceiling prepared by the preparation method described in the second aspect.

[0027] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0028] The leather-covered ceiling provided in the embodiment of the present invention can not only avoid the defects of loose adhesion and cracking between the leather fabric layer and the frame layer, but also cooperate with other leather-covered parts to enhance the overall texture and touch of the vehicle. At the same time, it can be covered with a variety of different leather fabrics to increase diversity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is a schematic diagram of the structure of the leather-covered ceiling of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the skeleton layer suture groove of the present invention;

[0033] Figure 3 A schematic diagram of the structure of a skeleton layer provided by the present invention;

[0034] Figure 4 This is one of the structural schematic diagrams of the skeleton layer of the present invention;

[0035] Figure 5 A simplified flow chart of the preparation of the leather-covered ceiling of the present invention;

[0036] in:

[0037] 1-leather fabric layer; 101-sewing area; 2-adhesive layer; 3-frame layer; 301-sewing groove;

[0038] 31-polyurethane board; 32-reinforced glass fiber layer; 321-glass fiber surface felt layer; 322-non-woven fabric layer. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0041] At present, the decoration of vehicle ceilings generally uses knitted fabrics to cover the skeleton layer to achieve a certain decorative effect; if it is covered with leather, it can not only improve the touch and texture of the ceiling, but also fit other leather-covered interiors, greatly improving the overall texture of the vehicle. However, the current vehicle ceilings are generally formed by one-piece pressing, and there are special-shaped surfaces at the position matching other vehicle parts. If it is pressed in one piece with leather, there will be problems of accumulation or wrinkles in the leather covering layer, and it is also easy to have problems such as the leather covering layer and the skeleton layer not being firmly bonded or debonding. Therefore, the present invention provides a leather-covered ceiling and a preparation method thereof.

[0042] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a leather-covered ceiling, the leather-covered ceiling comprises a leather fabric layer 1, an adhesive layer 2 and a skeleton layer 3, the leather fabric layer 1 is adhered to the surface of the skeleton layer 3 through the adhesive layer 2, wherein:

[0043] The leather fabric layer 1 is composed of a plurality of leather fabrics spliced ​​and sewn together, and a suture groove 301 is provided on the surface of the skeleton layer 3 , and the sewing area 101 of the leather fabric layer 1 is located in the suture groove 301 .

[0044] There are generally multiple irregular surfaces on the vehicle ceiling. If the leather fabric layer 1 and the frame layer 3 are directly pressed together to prepare the ceiling, the leather fabric layer 1 is not only prone to accumulation or wrinkles, but also prone to problems such as loose adhesion and debonding between the leather fabric layer 1 and the frame layer 3.

[0045] In the present invention, by providing a leather fabric layer 1 formed by stitching together multiple pieces of leather fabric, the problems of material accumulation, wrinkles, etc. that occur when using a whole piece of leather fabric as the leather fabric layer 1 can be avoided; and the present invention introduces a skeleton layer 3 with a suture groove 301, and the sewing area 101 of the leather fabric layer 1 is placed in the suture groove 301 (such as Figure 2 As shown), the leather fabric layer 1 and the skeleton layer 3 provided by the present invention can have an excellent bonding effect, and the leather fabric layer 1 and the skeleton layer 3 are not easy to be debonded. Therefore, the leather-covered ceiling provided by the present invention can solve the problem that the leather fabric layer 1 and the skeleton layer 3 are not firmly bonded and are easy to be debonded, and avoids the problems of leather fabric accumulation and wrinkles, and the overall covering is uniform, there is no uneven part, and the overall flatness effect is better.

[0046] If the suture groove 301 is not set on the surface of the skeleton layer 3, since the leather fabric layer 1 is formed by splicing and sewing multiple pieces of leather fabric, the sewing area 101 includes a double layer of leather fabric, which is thicker. It is easy for it to have problems such as loose adhesion and debonding with the skeleton layer 3. In terms of appearance, the thickness of the sewing area 101 cannot be consistent with that of the rest of the parts, and the flatness is poor.

[0047] For the leather fabric layer 1 described in the present invention:

[0048] The leather fabric layer 1 is obtained by splicing and sewing a plurality of leather fabrics, wherein:

[0049] In some embodiments of the present invention, the plurality of leather fabrics are cut according to the tensile deformation rate of the leather fabric layer 1 .

[0050] If the skeleton layer 3 is directly covered with leather fabric, since the skeleton layer 3 is not a simple planar structure and has multiple special-shaped surfaces, after the leather fabric is adhered to the skeleton layer 3, the tensile forces and tensile deformation rates of the leather fabric are different. The positions where the tensile deformation rates are too large are prone to poor adhesion to the skeleton layer 3 and debonding. Therefore, in the present invention, the leather fabric layer 1 is cut according to the tensile deformation rate of the leather fabric layer 1, and then spliced ​​and sewn, which can solve the problems of material accumulation and wrinkles on the leather fabric, and can also avoid debonding or cracking caused by the excessive tensile deformation rate of the leather fabric.

[0051] In some embodiments of the present invention, the thickness of the leather fabric layer 1 is 0.5-1.5 mm, for example, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are also applicable; preferably, the thickness of the leather fabric layer 1 is 1.0-1.2 mm.

[0052] For the adhesive layer 2 described in the present invention:

[0053] In some embodiments of the present invention, the binder layer 2 is a water-soluble adhesive layer.

[0054] The adhesive layer 2 described in the present invention serves to bond and fix the leather fabric layer 1 and the skeleton layer 3. The leather fabric layer 1 can be fixed to the surface of the skeleton layer 3 through the adhesive layer 2. In the embodiment of the present invention, the specific composition of the adhesive layer 2 is not limited. For example, the adhesive layer 2 can be formed by using a water-soluble adhesive or the like.

[0055] In some embodiments of the present invention, the thickness of the adhesive layer 2 is 0.1-0.15 mm, for example, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0056] For the skeleton layer 3 described in the present invention:

[0057] In some embodiments of the present invention, the skeleton layer 3 is integrally pressed.

[0058] The skeleton layer 3 described in the present invention is prepared by an integrated pressing process, that is, the suture grooves 301 on the surface of the skeleton layer 3 do not affect the overall thickness of the skeleton layer 3, and the skeleton layer 3 still has a uniform thickness. Therefore, in the leather-covered ceiling provided by the present invention, although the skeleton layer 3 is provided with certain suture grooves 301, it does not affect the mechanical properties of the ceiling and can still well meet the application requirements of the vehicle ceiling.

[0059] In some embodiments of the present invention, Figure 3 A schematic diagram of the structure of a skeleton layer provided in an embodiment of the present invention is shown in FIG. Figure 3 As shown, the skeleton layer 3 is a polyurethane composite board layer, which includes a polyurethane board 31. Reinforced glass fiber layers 32 are arranged on both sides of the polyurethane board 31. The reinforced glass fiber layer 32 includes a glass fiber surface felt layer 321 and a non-woven fabric layer 322. The glass fiber surface felt layer 321 is located between the non-woven fabric layer 322 and the polyurethane board 31.

[0060] It should be noted that in the embodiment of the present invention, the specific preparation process of the skeleton layer 3 is not limited. For example, the skeleton layer can be processed by selecting an appropriate processing technology according to the specific composition form of the skeleton layer 3. For example, for the polyurethane composite sheet of the present invention, a dry production process (also known as a cold mold method) can be used to process its raw materials. Specifically, the polyurethane plate 31 can be heated to a certain temperature, such as 180-200°C, for example, it can be 180°C, 185°C, 190°C, 195°C, 200°C, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are also applicable to make it reach a plastic state, and then put it in a mold and press it with other raw materials, such as non-woven fabrics and glass fiber surface felts, and adhesives used. In addition, a wet production process (also known as a hot mold method) can also be used to process the raw materials. Specifically, the polyurethane plate 31 can be loaded first, then glue rolled, water sprayed, and superimposed, and finally pressed using a mold. The present invention can refer to the above description to adaptively select the processing technology, which does not mean that the present invention must select the above method, and the embodiments of the present invention are not limited here.

[0061] In some embodiments of the present invention, the thickness of the skeleton layer 3 is 2.5-6.0 mm, for example, 2.5 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, and 6.0 mm, but the present invention is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0062] In some embodiments of the present invention, the width of the suture groove 301 is 2.5-3 times the thickness of the leather fabric layer 1, for example 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3 times, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0063] The thickness of the sewing area 101 formed after splicing and sewing multiple pieces of leather is twice the thickness of the leather fabric layer 1. When it is set in the suture groove 301, the width of the suture groove 301 needs to accommodate all the fabrics of the sewing area 101, that is, the leather fabric with twice the thickness. At the same time, in order to avoid a certain deviation in the thickness of the leather fabric layer 1, and to facilitate the placement of the sewing area 101 into the suture groove 301 during the preparation process, therefore, the present invention preferably sets the width of the suture groove 301 to 2.5-3 times the thickness of the leather fabric layer 1. This design can ensure that the sewing area 101 and the suture groove 301 can fit tightly, and the two have better adhesion, thereby avoiding the problem of weak adhesion between the sewing area 101 and the skeleton layer 3 and meeting the processing and preparation requirements.

[0064] In some embodiments of the present invention, the depth of the suture groove 301 is 1.5-2 times the cutting width of the sewing area 101, for example 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, but the present invention is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0065] At present, after multiple leather fabrics are spliced ​​and sewn, they are generally trimmed to leave a certain width of trimmed edges. The depth of the suture groove 301 needs to accommodate all the trimmed edges. At the same time, in order to prevent the suture from being exposed, the present invention can set the suture in the suture groove 301 (such as Figure 2 ), this operation can also prevent the suture from breaking, therefore, the present invention limits the depth of the suture groove 301 to 1.5-2 times the cutting width of the sewing area 101.

[0066] In some embodiments of the present invention, the suture groove 301 is at least arranged at the profiled surface of the skeleton layer 3, or at a position where the tensile deformation rate of the leather fabric layer 1 exceeds 10-15%.

[0067] In some embodiments of the present invention, the skeleton layer 3 is provided with a skylight hole, and the suture groove is provided at the seam where the leather covering the four rounded corners of the skylight hole extends forward or backward and is connected with another piece of leather, as well as at the seam between the two pieces of leather in the area corresponding to the skylight hole and the B-pillar of the vehicle, and at the seam between the two pieces of leather in the area corresponding to the roof and the B-pillar.

[0068] In a specific embodiment of the present invention, a schematic diagram of the structure of a skeleton layer 3 having a suture groove 301 disposed on the surface is provided, such as Figure 4 As shown:

[0069] Figure 4 This is one of the structural schematic diagrams of the skeleton layer 3 of the present invention, as shown in Figure 4As shown, the skeleton layer 3 is provided with a skylight window to facilitate the subsequent placement of the vehicle sunroof. At the four rounded corners of the skylight window included in the skeleton layer 3, the surface stretching is large, and the leather fabric is prone to wrinkles and surface unevenness. Therefore, the leather fabric layer 1 can add a sewing area 101 here, and in the skeleton layer 3, the areas extending forward or backward of the four rounded corners can be correspondingly set with a suture groove 301, that is, a suture groove 301 is set at position a in the figure. The connection position between the sunroof hole and the vehicle's B-pillar, i.e., point b, is a special-shaped surface. If it is covered with leather fabric, the tensile deformation rate here is relatively large, and the leather fabric is prone to wrinkles and non-fitting problems, which may eventually lead to problems such as loose adhesion and debonding between the leather fabric layer 1 and the skeleton layer 3. Therefore, the leather fabric layer 1 can add a sewing area 101 here, and a suture groove 301 is correspondingly provided in the skeleton layer 3. At the same time, for the convenience of operation, point c is added, that is, a suture groove 301 is provided at the seam of the two pieces of leather in the area corresponding to the ceiling and the B-pillar.

[0070] Figure 4 The skeleton layer 3 is divided into different zones by using the color depth. Figure 4 It can be seen that the skeleton layer in the figure is divided into six parts, and the six parts can correspond to six pieces of leather fabrics. The six pieces of leather fabrics are spliced ​​and sewn into a leather fabric layer 1, and the sewing area 101 is located in the suture groove 301.

[0071] The leather-covered ceiling provided in the embodiment of the present invention can not only avoid the defects of loose adhesion and cracking between the leather fabric layer 1 and the skeleton layer 3, but also cooperate with other leather-covered parts to enhance the overall texture and touch of the vehicle. At the same time, it can be covered with a variety of different leather fabrics to increase diversity.

[0072] The embodiment of the present invention further provides a method for preparing the leather-covered ceiling, the method comprising the following steps:

[0073] (1) splicing and sewing a plurality of genuine leather fabrics to obtain a genuine leather fabric layer;

[0074] (2) forming a suture groove on the surface of the skeleton layer close to the leather fabric layer;

[0075] (3) The leather fabric layer is adhered to the surface of the skeleton layer by using an adhesive layer, wherein the sewing area of ​​the leather fabric layer is arranged in the suture groove to obtain the leather-covered ceiling.

[0076] In some embodiments of the present invention, in step (1), based on the tensile deformation rate of the leather fabric layer, the areas subjected to a tensile deformation rate greater than the maximum tensile deformation rate of the leather fabric itself are cut to obtain the plurality of leather fabrics.

[0077] The maximum tensile deformation rate that the leather fabric itself can withstand is about 10-15%, that is, in step (1), the preparation method of the plurality of leather fabrics includes: after adhering the entire leather fabric to the skeleton layer, analyzing the tensile force exerted on the entire leather fabric, cutting the position where the tensile deformation rate is greater than the maximum tensile deformation rate (about 10-15%) that it can withstand, and obtaining the plurality of leather fabrics. In application production, a cutting template can also be directly designed according to the above method, and the template can be directly used for cutting and processing to obtain a plurality of leather fabrics, and then they are spliced ​​and sewn.

[0078] The maximum tensile deformation rate described in the present invention is about 10-15%, for example, it can be 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0079] In some embodiments of the present invention, the width of the suture groove is 2.5-3 times the thickness of the leather fabric layer, for example, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3 times, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are equally applicable. The depth is 1.5-2 times the cutting edge width of the sewing area, for example, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, etc., but the present invention is not limited to the listed values, and other unlisted values ​​within the range are equally applicable.

[0080] In some embodiments of the present invention, the method of adhering comprises first performing hot pressing and then performing cold pressing.

[0081] When bonding the dermis covering layer and the skeleton layer, the present invention first uses a hot pressing method and then a cold pressing method, which can ensure the bonding strength between the dermis covering layer and the skeleton layer and further avoid problems such as debonding of the dermis covering layer after application.

[0082] In the present invention, the adhesive layer is first activated by hot pressing. During the hot pressing process, the leather fabric layer and the skeleton layer are completely bonded, and then cold pressing is performed. Cold pressing can quickly cool the adhesive layer to complete the shaping of the leather-covered ceiling. The combination of hot pressing and cold pressing can effectively increase the bonding strength of the leather fabric layer to the skeleton layer.

[0083] In a specific embodiment of the present invention, Figure 5 As shown, the present invention provides a specific preparation method of the leather-covered ceiling as follows:

[0084] S1: Preparation of leather fabric layer

[0085] S11. Pattern making: designing a pattern drawing of the leather fabric layer according to the tensile deformation rate of the leather fabric layer (cutting the part with a tensile deformation rate greater than 10-15% (the maximum tensile deformation rate that the leather itself can withstand));

[0086] S12. Cutting and sewing: Cut the leather fabric using the pattern diagram, and sew the cut leather fabric in accordance with the divided areas of the ceiling. The sewing adopts a trimming process, and the trimming width can be selected to be 1.4-1.5 mm, such as 1.4 mm, 1.45 mm, and 1.5 mm, but the present invention is not limited to the listed values, and other values ​​not listed in the range are also applicable;

[0087] S13. Glue spraying: Spray glue on the leather fabric layer obtained by sewing. The glue should be 140-180g / m 2 Spray glue, the amount of glue sprayed is 140-180g / m 2 Can be 140g / m 2 , 145g / m 2 , 150g / m 2 , 155g / m 2 , 160g / m 2 , 165g / m 2 , 170g / m 2 , 175g / m 2 , 180g / m 2 etc., but the present invention is not limited to the listed values, and other values ​​not listed within the range are also applicable;

[0088] S14. Baking: The leather fabric layer after spraying is placed in a circulating air oven for baking at a temperature of 55-65°C, for example, 55°C, 56°C, 57°C, 58°C, 60°C, 62°C, 64°C, etc., but the present invention is not limited to the listed values, and other values ​​not listed in the range are also applicable, the time is 120s, and the moisture of the glue is removed;

[0089] S2: Preparation of skeleton layer

[0090] S21. Pressing and forming: According to the conventional pressing process, a suture groove is added in the sewing area corresponding to the leather fabric layer to complete the forming of the skeleton layer;

[0091] S22. Glue spraying: Spray glue on the skeleton layer, the glue should be 140-180g / m 2 Spray glue, the amount of glue sprayed is 140-180g / m 2 Can be 140g / m 2 , 145g / m 2 , 150g / m 2 , 155g / m 2, 160g / m 2 , 165g / m 2 , 170g / m 2 , 175g / m 2 , 180g / m 2 etc., but the present invention is not limited to the listed values, and other values ​​not listed within the range are also applicable;

[0092] S23. Baking: The skeleton layer after spraying is placed in a circulating air oven for baking, and the baking temperature is 55-65 ° C, for example, 55 ° C, 56 ° C, 57 ° C, 58 ° C, 60 ° C, 62 ° C, 64 ° C, etc., but the present invention is not limited to the values ​​listed, other values ​​not listed in the range are also applicable, the time is 120s, remove the glue moisture;

[0093] S3: Overmolding

[0094] S31. Positioning: Position the baked skeleton layer and the leather fabric layer in the sewing area, align the sewing area of ​​the leather fabric layer with the suture groove of the skeleton layer, and fix them with a positioning tool knife to ensure the straightness of the suture and fix the skeleton layer to prevent the skeleton layer from moving;

[0095] S32. Hot pressing / cold pressing: The mold is heated by a hot water unit to activate the glue on the leather fabric layer and the skeleton layer. The temperature of the hot water unit is 80-90°C, for example, it can be 80°C, 81°C, 82°C, 83°C, 84°C, 85°C, 86°C, 87°C, 88°C, 89, 90, etc., but the present invention is not limited to the listed values, and other values ​​not listed in the range are also applicable. The pressing depth is 0.5mm, the holding time is 30s, and the cold pressing process is performed after the holding; the mold is cooled by a chiller to quickly cool the activated glue. The temperature of the chiller is 15-25°C, for example, it can be 15°C, 16°C, 18°C, 19°C, 20°C, 22°C, 23°C, 25°C, etc., but the present invention is not limited to the listed values, and other values ​​not listed in the range are also applicable. The pressing depth is 0.5mm, the holding time is 30s, and the subsequent process is performed after the holding is completed;

[0096] S33. Edge and corner wrapping: Edge and corner wrapping of the obtained leather-covered ceiling are carried out to see whether it is qualified.

[0097] It should be noted that, for the preparation of the dermis coating layer and the skeleton layer, there is no particular order between the two and they can be carried out according to the actual situation.

[0098] In some embodiments of the present invention, the peel strength between the dermis coating layer and the skeleton layer is greater than 35 N / m.

[0099] The leather-covered ceiling prepared by the preparation method provided by the embodiment of the present invention has a high peeling strength, that is, the leather fabric layer and the skeleton layer are firmly bonded and are not easy to debond.

[0100] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0101] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A leather covered ceiling, characterized in that: The leather covered ceiling comprises a leather fabric layer, an adhesive layer and a skeleton layer, wherein the leather fabric layer is adhered to the surface of the skeleton layer through the adhesive layer, wherein: The leather fabric layer is composed of a plurality of leather fabrics that are spliced ​​and sewn together, a suture groove is arranged on the surface of the skeleton layer, and the sewing area of ​​the leather fabric layer is located in the suture groove.

2. The leather covered ceiling according to claim 1, characterized in that: The width of the suture groove is 2.5-3 times the thickness of the leather fabric layer; And / or, the depth of the suture groove is 1.5-2 times the cutting width of the sewing area.

3. The leather covered ceiling according to claim 1 or 2, characterized in that: The suture groove is at least arranged at the profiled surface of the skeleton layer, or at a position where the tensile deformation rate of the leather fabric layer exceeds 10-15%.

4. The leather covered ceiling according to claim 1 or 2, characterized in that: The skeleton layer is provided with a skylight hole, and the suture groove is provided at the seam where the leather covering the four rounded corners of the skylight hole extends forward or backward and joins with another piece of leather, as well as at the seam between the two pieces of leather in the area corresponding to the skylight hole and the B-pillar of the vehicle, and at the seam between the two pieces of leather in the area corresponding to the roof and the B-pillar.

5. The leather covered ceiling according to claim 1 or 2, characterized in that: The skeleton layer is integrally pressed and formed; And / or, the plurality of leather fabrics are cut according to the tensile deformation rate of the leather fabric layer; And / or, the binder layer is a water-soluble adhesive layer.

6. The leather covered ceiling according to claim 1 or 2, characterized in that: The skeleton layer is a polyurethane composite board layer, which includes a polyurethane board. Reinforced glass fiber layers are arranged on both sides of the polyurethane board. The reinforced glass fiber layers include a glass fiber surface felt layer and a non-woven fabric layer. The glass fiber surface felt layer is located between the non-woven fabric layer and the polyurethane board.

7. The leather covered ceiling according to claim 1 or 2, characterized in that: The thickness of the leather fabric layer is 0.5-1.5 mm; And / or, the thickness of the adhesive layer is 0.1-0.15 mm; And / or, the thickness of the skeleton layer is 2.5-6.0 mm.

8. The method for preparing a leather-covered ceiling according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) splicing and sewing a plurality of genuine leather fabrics to obtain a genuine leather fabric layer; (2) forming a suture groove on the surface of the skeleton layer close to the leather fabric layer; (3) The leather fabric layer is adhered to the surface of the skeleton layer by using an adhesive layer, wherein the sewing area of ​​the leather fabric layer is arranged in the suture groove to obtain the leather-covered ceiling.

9. The preparation method according to claim 8, characterized in that: In step (1), based on the tensile deformation rate of the leather fabric layer, the region where the tensile deformation rate is greater than the maximum tensile deformation rate of the leather fabric itself is cut to obtain the plurality of leather fabrics; and / or, the width of the suture groove is 2.5-3 times the thickness of the leather fabric layer, and the depth is 1.5-2 times the cutting width of the sewing area; And / or, the method of adhering comprises first performing hot pressing and then performing cold pressing.

10. A vehicle, characterized in that: The vehicle comprises the leather-covered ceiling according to any one of claims 1 to 7, or the leather-covered ceiling prepared by the preparation method according to claim 8 or 9.

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