Processing technology for improving leather luggage cracking

Abstract

The present application relates to the leather processing technical field, specifically to a kind of processing technology for improving leather luggage easy to crack, comprising the following steps: S1: selecting raw leather, preliminary treatment is carried out to remove surface impurities, and adjust moisture content;S2: the leather after S1 processing is soaked in natural plant oil solution;S3: the leather after soaking is treated with sound wave;S4: heat pressing treatment is carried out, and the gap between leather fibers is sealed;S5: the leather after heat pressing treatment is cooled and cured;S6: using nanoscale filler, the leather after curing is filled;S7: the leather after filling is treated with final surface coating, and protective layer is formed.The present application, by comprehensive treatment method, significantly improves the flexibility, waterproofness, pressure resistance and crack resistance of leather, while using environmentally friendly materials to optimize cost, effectively prolongs the service life of leather products and reduces environmental impact.

Description

A processing technology to improve the cracking susceptibility of leather bags Technical Field

[0001] This invention relates to the field of leather processing technology, and in particular to a processing technology for improving the cracking susceptibility of leather bags. Background Technology

[0002] Leather bags are popular for their unique appearance and durability, but they are prone to cracking during long-term use, especially with frequent use or exposure to harsh environments. Traditional leather processing methods mainly focus on using chemical tanning agents and dyes to enhance their appearance and softness. However, these methods often neglect to improve the leather's crack resistance and long-term durability. Although there are various processing techniques on the market to improve the softness and water resistance of leather, these techniques often fail to fully address the structural stability and durability of leather after experiencing physical stress. This leads to leather products being prone to cracking during use, thus affecting the product's lifespan and user satisfaction.

[0003] The main limitation of current leather processing technology lies in the lack of a comprehensive approach to simultaneously improve the leather's flexibility, water resistance, pressure resistance, and crack resistance. Most processing methods tend to use a single chemical or physical treatment without considering the interaction and synergistic effects between these treatments. In addition, existing methods often involve the use of high concentrations of chemicals, which may not only have a negative impact on the environment but may also increase processing costs without enhancing the leather's intrinsic properties.

[0004] Therefore, developing a new leather processing technology that can comprehensively improve the physical and chemical properties of leather while addressing environmental impact and cost-effectiveness issues is a pressing technical challenge in the market. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides a processing technology to improve the cracking susceptibility of leather bags.

[0006] A processing technique for improving the cracking susceptibility of leather bags includes the following steps:

[0007] S1: Select raw leather, perform preliminary treatment to remove surface impurities, and adjust the moisture content to between 12% and 15%;

[0008] S2: The leather treated with S1 is soaked in a natural plant oil solution for a thorough soaking to improve its flexibility and water resistance.

[0009] S3: The soaked leather is treated with sound waves, and the leather fibers are made more uniform by sound wave vibration at a predetermined frequency.

[0010] S4: Perform hot pressing treatment, and seal the gaps between leather fibers by controlling temperature and pressure;

[0011] S5: Cooling and aging the hot-pressed leather to stabilize its structure;

[0012] S6: Nanoscale fillers are used to fill the aged leather to increase its density and compressive strength;

[0013] S7: Apply a final surface coating to the filled leather to form a protective layer.

[0014] Furthermore, the selection of raw leather in S1 includes cowhide, sheepskin, or pigskin.

[0015] Furthermore, the preliminary processing in S1 specifically includes:

[0016] S11: Mechanically clean the raw leather by scraping and brushing to remove surface dirt and impurities;

[0017] S12: Chemically clean the leather after mechanical cleaning by soaking it in a 5%-10% weak alkaline solution for 10-20 minutes to thoroughly remove residual impurities from the surface.

[0018] S13: Dry the cleaned leather by using a blower at a temperature of 30℃ to 40℃ for 1-2 hours.

[0019] S14: Apply a humidification spray to the dried leather using purified water to adjust the leather's moisture content to 12%-15% and ensure even absorption.

[0020] Furthermore, S2 specifically includes:

[0021] S21: Prepare a natural plant oil solution by mixing plant oil with water at a mass ratio of 15%-20% and stirring until a stable emulsion is formed.

[0022] S22: Completely immerse the leather treated in S1 in the natural plant oil solution, ensuring that the solution fully covers the surface of the leather;

[0023] S23: Control the soaking temperature at 20℃ to 25℃ and keep it constant for 36 hours;

[0024] S24: Stir the solution every 6 hours during the soaking process;

[0025] S25: After soaking, remove the leather from the solution and spin dry to remove excess vegetable oil solution from the surface.

[0026] Furthermore, S3 specifically includes:

[0027] S31: Place the leather soaked in S2 into the sonic treatment equipment and spread the leather out flat to avoid overlapping;

[0028] S32: Set the frequency of the acoustic wave processing device to 40kHz and control the amplitude within the range of 10-20 micrometers;

[0029] S33: Start the acoustic treatment equipment to continuously treat the leather for 20 minutes;

[0030] S34: During the processing, the position of the leather is adjusted every 5 minutes to ensure that the sound waves act evenly on all parts of the leather;

[0031] S35: After the sonic treatment is complete, remove the leather from the equipment and let it stand for 5 minutes to relieve internal stress.

[0032] Furthermore, S4 specifically includes:

[0033] S41: Place the leather treated with S3 acoustic wave in a hot press and ensure that the leather is flat and wrinkle-free;

[0034] S42: Set the target temperature of the hot press equipment to 70°C to 90°C, and preheat the equipment to the target temperature;

[0035] S43: Set the hot pressing pressure to 5MPa, place the leather between the hot pressing plates, and gradually apply pressure;

[0036] S44: The leather is subjected to heat pressing under maintained temperature and pressure conditions for 10 minutes;

[0037] S45: During the process, check the temperature and pressure of the hot press plate every 5 minutes to ensure its stability;

[0038] S46: After the hot pressing process is completed, gradually reduce the pressure to zero and remove the leather from the hot pressing equipment and lay it flat to cool.

[0039] Furthermore, S5 specifically includes:

[0040] S51: Remove the leather that has undergone S4 heat pressing from the heat pressing equipment and quickly place it flat on the cooling rack;

[0041] S52: Use a blower to cool the leather, with the cooling temperature controlled between 20°C and 25°C, and the cooling time is 30 minutes;

[0042] S53: After cooling, the leather is transferred to a curing chamber, where the temperature is controlled at 25°C to 30°C and the relative humidity is maintained at 40%-50%.

[0043] S54: The leather is left to stand in the curing chamber for 24 hours to allow the internal structure of the leather to gradually stabilize;

[0044] S55: During the curing process, check and record the temperature and humidity of the curing chamber every 4 hours to ensure stable environmental conditions.

[0045] Furthermore, S6 specifically includes:

[0046] S61: Lay the S5 cured leather flat on the coating table, ensuring the leather is flat;

[0047] S62: Prepare a nanoscale filler solution. The nanofiller is selected as a silane compound, and the solution concentration is controlled at 5%-10%.

[0048] S63: Use a spraying device to evenly spray nano-level fillers onto the leather surface, with the spraying thickness controlled at 0.1-0.2 mm;

[0049] S64: Place the sprayed leather in a constant temperature chamber, with the temperature controlled between 30°C and 40°C, and let it stand for 2 hours to ensure that the filler fully penetrates and cures.

[0050] S65: After the filling process is completed, the leather is dried a second time using a blower at a temperature of 25°C to 30°C for 1 hour.

[0051] Furthermore, S7 specifically includes:

[0052] S71: Place the leather after S6 filling treatment on the coating machine to ensure that the leather is flat and wrinkle-free;

[0053] S72: Prepare a polymer coating solution containing 3%-5% UV-resistant and antioxidant compounds;

[0054] S73: Use a coating machine to evenly coat the polymer coating solution onto the leather surface, with the coating thickness controlled at 0.3-0.5 mm;

[0055] S74: Place the coated leather in a drying room at a temperature of 50°C to 60°C for 1-2 hours to ensure that the coating is fully cured.

[0056] S75: After drying, cool the leather and leave it at room temperature for 30 minutes to allow the coating to stabilize.

[0057] The beneficial effects of this invention are:

[0058] This invention significantly improves the flexibility and water resistance of leather by comprehensively utilizing multiple processing methods, while also enhancing its pressure resistance and crack resistance. Through soaking in natural plant oils, the leather fibers are fully nourished and softened, making the leather more durable when subjected to physical stretching or pressure. The application of sonic treatment and hot pressing technology ensures a tighter bond between the leather fibers, greatly improving the structural stability of the leather and effectively preventing cracking during long-term use.

[0059] This invention uses environmentally friendly materials, such as natural plant oils and low-concentration nanofillers, which not only reduces the impact on the environment but also optimizes processing costs. The optimization of the entire processing process aims to reduce the use of chemical substances, while maximizing material utilization and processing efficiency by precisely controlling the conditions of each processing step. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 is a schematic diagram of the processing technology for improving the cracking of leather bags according to an embodiment of the present invention;

[0062] Figure 2 is a schematic diagram of the acoustic wave processing flow according to an embodiment of the present invention. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0064] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] Example 1

[0066] As shown in Figures 1 and 2, a processing technology for improving the cracking susceptibility of leather bags includes the following steps:

[0067] S1: Select raw leather, perform preliminary treatment to remove surface impurities, and adjust the moisture content to between 13% to maintain the original softness and elasticity of the leather;

[0068] S2: The leather treated with S1 is soaked in a natural plant oil solution for a thorough soaking to improve its flexibility and water resistance.

[0069] S3: The soaked leather is treated with sound waves, which use sound waves of a predetermined frequency to make the leather fibers more uniform and enhance the adhesion between the fibers.

[0070] S4: Hot pressing is performed, which seals the gaps between leather fibers by controlling temperature and pressure, thereby enhancing the stability of the leather structure;

[0071] S5: Cooling and aging the hot-pressed leather to stabilize its structure;

[0072] S6: Nanoscale fillers are used to fill the aged leather to increase its density and compressive strength;

[0073] S7: The leather after filling is given a final surface coating to form a protective layer, which effectively prevents cracking caused by external environmental factors (such as ultraviolet rays, oxidation, etc.).

[0074] The choice of raw leather in S1 includes cowhide.

[0075] The preliminary processing in S1 specifically includes:

[0076] S11: Mechanically clean the raw leather by scraping and brushing to remove surface dirt and impurities;

[0077] S12: Chemically clean the leather after mechanical cleaning by soaking it in a weak alkaline solution with a mass ratio of 8% for 15 minutes to thoroughly remove residual impurities from the surface.

[0078] S13: Dry the cleaned leather by using a blower at 35°C for 1.5 hours.

[0079] S14: Apply a humidification spray to the dried leather using purified water to adjust the leather's moisture content to 13% and ensure even absorption.

[0080] S2 specifically includes:

[0081] S21: Prepare a natural plant oil solution by mixing plant oil with water at a mass ratio of 18% and stirring until a stable emulsion is formed.

[0082] S22: Immerse the leather treated with S1 completely in a natural plant oil solution, ensuring that the solution fully covers the surface of the leather;

[0083] S23: Control the soaking temperature at 23℃ and keep it constant. Soak for 36 hours to ensure that the leather fibers fully absorb the vegetable oil.

[0084] S24: Stir the solution every 6 hours during the soaking process to ensure that the solution components are evenly distributed and effectively penetrate into the leather fibers;

[0085] S25: After soaking, remove the leather from the solution and spin dry to remove excess vegetable oil solution from the surface.

[0086] S3 specifically includes:

[0087] S31: Place the leather soaked in S2 into the sonic treatment equipment and spread the leather out flat to avoid overlapping;

[0088] S32: Set the frequency of the acoustic wave processing device to 40kHz and the amplitude to 15 micrometers;

[0089] S33: Start the acoustic treatment equipment to continuously treat the leather for 20 minutes;

[0090] S34: During the processing, the position of the leather is adjusted every 5 minutes to ensure that the sound waves act evenly on all parts of the leather;

[0091] S35: After the sonic treatment is complete, remove the leather from the equipment and let it stand for 5 minutes to relieve internal stress.

[0092] S4 specifically includes:

[0093] S41: Place the leather treated with S3 acoustic wave in a hot press and ensure that the leather is flat and wrinkle-free;

[0094] S42: Set the target temperature of the hot press equipment to 80℃ and preheat the equipment to the target temperature;

[0095] S43: Set the hot pressing pressure to 5MPa, place the leather between the hot pressing plates, and gradually apply pressure;

[0096] S44: The leather is subjected to heat pressing under maintained temperature and pressure conditions for 10 minutes;

[0097] S45: During the process, check the temperature and pressure of the hot press plate every 5 minutes to ensure its stability;

[0098] S46: After the hot pressing process is completed, gradually reduce the pressure to zero and remove the leather from the hot pressing equipment and lay it flat to cool.

[0099] S5 specifically includes:

[0100] S51: Remove the leather that has undergone S4 heat pressing from the heat pressing equipment and quickly place it flat on the cooling rack;

[0101] S52: Use a blower to cool the leather, with the cooling temperature controlled at 22℃ and the cooling time being 30 minutes;

[0102] S53: After cooling, the leather is transferred to a curing chamber, where the temperature is controlled at 28°C and the relative humidity is maintained at 45%.

[0103] S54: The leather is left to stand in the curing chamber for 24 hours to allow the internal structure of the leather to gradually stabilize;

[0104] S55: During the curing process, check and record the temperature and humidity of the curing chamber every 4 hours to ensure stable environmental conditions.

[0105] S6 specifically includes:

[0106] S61: Lay the S5 cured leather flat on the coating table, ensuring the leather is flat;

[0107] S62: Prepare a nanoscale filler solution. The nanofiller is selected as a silane compound, and the solution concentration is controlled at 7.5%.

[0108] S63: Use a spraying device to evenly spray nano-level fillers onto the leather surface, with the spraying thickness controlled at 0.15 mm;

[0109] S64: Place the sprayed leather in a constant temperature chamber at 35°C and let it stand for 2 hours to ensure that the filler fully penetrates and cures.

[0110] S65: After the filling process is completed, the leather is dried a second time using a blower at a temperature of 25°C to 30°C for 1 hour.

[0111] S7 specifically includes:

[0112] S71: Place the leather after S6 filling treatment on the coating machine to ensure that the leather is flat and wrinkle-free;

[0113] S72: Prepare a polymer coating solution containing 4% UV-resistant and antioxidant compounds;

[0114] S73: Use a coating machine to evenly coat the polymer coating solution onto the leather surface, with the coating thickness controlled at 0.4 mm;

[0115] S74: Place the coated leather in a drying room at 55°C for 1.5 hours to ensure the coating is fully cured;

[0116] S75: After drying, cool the leather and leave it at room temperature for 30 minutes to allow the coating to stabilize.

[0117] Example 2

[0118] S1: First, sheepskin is selected as the raw material, and the surface mud and impurities are scraped off by hand; then, a 5% weak alkaline solution is used for chemical cleaning, and the soaking time is set to 10 minutes to thoroughly remove the surface residue; after that, the leather is dried in an environment with the temperature controlled at 30℃ for 1 hour; finally, a spray humidification treatment is carried out, and the moisture content of the leather is adjusted to 12% using pure water to ensure that the leather absorbs moisture evenly.

[0119] S2: After initial treatment, the leather is soaked in a natural vegetable oil solution made of 15% vegetable oil and water. The entire soaking process is carried out under constant temperature conditions, with the temperature maintained at 20°C for 36 hours. To ensure even distribution of the oil, the solution is stirred every 6 hours.

[0120] S3: After soaking, the leather is placed in a sonic treatment device. The device is set with a sonic frequency of 40kHz and an amplitude of 10 micrometers. The leather is treated continuously for 20 minutes under these conditions, and the position of the leather is adjusted every 5 minutes to ensure that the sonic waves can act evenly on every part of the leather.

[0121] S4: The treated leather is subjected to hot pressing. The hot pressing equipment is preheated to 70°C and the pressure is set to 5MPa. The leather is treated at this temperature and pressure for 10 minutes to ensure that the gaps between the leather fibers are effectively sealed.

[0122] S5: After hot pressing, the leather needs to be cooled quickly to fix its shape. It is rapidly cooled for 30 minutes using cold air at a temperature of 20°C. After that, the leather is transferred to a curing chamber where the temperature is controlled at 25°C and the relative humidity is maintained at 40%. The leather is cured under these conditions for 24 hours, during which the environmental conditions are checked and adjusted every 4 hours to ensure the stability of the curing process.

[0123] S6: After aging, the leather is filled using a nano-filler solution containing 5% silane compounds. The filler is evenly sprayed on the leather surface with a thickness of 0.1 mm and placed in a constant temperature room at 30°C for 2 hours to ensure that the filler fully penetrates and cures. After the filling treatment is completed, the leather is dried a second time using a blower at 25°C for 1 hour.

[0124] S7: After filling, the surface of the leather undergoes a final coating treatment. The prepared coating solution contains 3% UV and antioxidant compounds. The coating is evenly applied to the leather surface using a coating machine, with the coating thickness controlled at 0.3 mm. After coating, the leather is dried in a drying room at 50°C for 1 hour to ensure that the coating is fully cured. After drying, the leather undergoes a final cooling treatment and is left to stand at room temperature for 30 minutes to ensure that the coating is completely stable.

[0125] Example 3

[0126] S1: First, pigskin is selected as the raw material, and surface mud and impurities are manually scraped off; then, a 10% weak alkaline solution is used for chemical cleaning, with a soaking time of 20 minutes, to thoroughly remove residual impurities from the surface; after that, the leather is dried in an environment with the temperature controlled at 40℃ for 2 hours; finally, a spray humidification treatment is carried out, using purified water to adjust the moisture content of the leather to 15%, ensuring that the leather absorbs moisture evenly;

[0127] S2: After initial treatment, the leather is soaked in a natural vegetable oil solution made of 20% vegetable oil and water. The entire soaking process is carried out under constant temperature conditions, with the temperature maintained at 25°C, for a duration of 36 hours. To ensure even distribution of the oil, the solution is stirred every 6 hours.

[0128] S3: After soaking, the leather is placed in a sonic treatment device. The device is set with a sonic frequency of 40kHz and an amplitude of 20 micrometers. The leather is treated continuously for 20 minutes under these conditions, with the leather position adjusted every 5 minutes to ensure that the sonic waves can act evenly on every part of the leather.

[0129] S4: The treated leather is subjected to hot pressing. The hot pressing equipment is preheated to 90°C and the pressure is set to 5MPa. The leather is treated at this temperature and pressure for 10 minutes to ensure that the gaps between the leather fibers are effectively sealed.

[0130] S5: After hot pressing, the leather needs to be cooled quickly to fix its shape. It is rapidly cooled for 30 minutes using cold air at a temperature of 25°C. After that, the leather is transferred to a curing chamber where the temperature is controlled at 30°C and the relative humidity is maintained at 50%. The leather is cured under these conditions for 24 hours, during which the environmental conditions are checked and adjusted every 4 hours to ensure the stability of the curing process.

[0131] S6: After aging, the leather is filled using a nano-filler solution containing 10% silane compounds. The filler is evenly sprayed onto the leather surface with a thickness of 0.2 mm and placed in a constant temperature room at 40℃ for 2 hours to ensure that the filler fully penetrates and cures. After the filling treatment is completed, the leather is dried a second time using a blower at 30℃ for 1 hour.

[0132] S7: After filling, the surface of the leather undergoes a final coating treatment. The prepared coating solution contains 5% UV and antioxidant compounds. The coating is evenly applied to the leather surface using a coating machine, with the coating thickness controlled at 0.5 mm. After coating, the leather is dried in a drying room at 60°C for 2 hours to ensure that the coating is fully cured. After drying, the leather undergoes a final cooling treatment and is left to stand at room temperature for 30 minutes to ensure that the coating is completely stable.

[0133] Table 1 Comparison of physical and mechanical properties

[0134] Comparison Item Example 1 Example 2 Example 3 Tensile Strength (MPa) 35 30 32 Elongation (%) 55 50 52 Tear Resistance (N / mm) 85 80 82 Hydrostatic Strength (kPa) 1500 1300 1400 Strength Retention Rate after Heat Aging (%) 90 85 88 Abrasion Resistance (Cycles) 5000 4500 4700 surface

[0135] Table 2 Comparison of Durability and Environmental Factors

[0136] Comparison Item Example 1 Example 2 Example 3 Color Retention Rate (%) 95 90 92 Maximum Heat Resistance (°C) 110 105 108 Chemical Resistance (hours) 48 40 45 Air Permeability (g / m2 / 24h) 300 270 290 Environmental Adaptability Index (dimensionless) 9.7 99.3 UV Resistance (hours) 220 180 200 surface

[0137] As can be seen from Tables 1 and 2 above, Example 1 demonstrates superior performance in multiple key performance indicators. In the comparison of physical and mechanical properties, Example 1 exhibits the highest tensile strength, elongation, and tear resistance, indicating that it can maintain its structural integrity under greater force and longer service life. In addition, its hydrostatic strength and strength retention rate after heat aging are higher than other examples, showing better water resistance and long-term stability. In the comparison of durability and environmental factors, Example 1 is superior to Examples 2 and 3 in terms of color retention, maximum heat resistance, and chemical resistance, providing better color stability and usability in extreme environments. Its breathability and environmental adaptability index are also the highest, indicating that it is more suitable for long-term wear and adaptable to different environmental conditions. Its UV resistance is also better than other examples, which is particularly important for protecting leather from fading and aging caused by direct sunlight.

[0138] Overall, the treatment method in Example 1 significantly improves the overall performance and durability of the leather, making it an ideal choice for manufacturing high-quality leather products, especially suitable for applications requiring long-term durability and environmental adaptability.

[0139] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A processing technology for improving the cracking susceptibility of leather bags, characterized in that, Includes the following steps: S1: Select raw leather, perform preliminary treatment to remove surface impurities, and adjust the moisture content to between 12% and 15%; S2: Immerse the leather treated in S1 in a natural plant oil solution to enhance its flexibility and water resistance; S3: Perform sonic treatment on the soaked leather, using sonic vibrations at a predetermined frequency to make the leather fibers more uniform; specifically including: S31: Place the leather soaked in S2 in the sonic treatment equipment and spread it out flat to avoid overlapping; S32: Set the frequency of the sonic treatment equipment to 40... S33: Start the acoustic wave treatment equipment to continuously treat the leather for 20 minutes; S34: During the treatment, adjust the position of the leather every 5 minutes to ensure that the acoustic waves act evenly on all parts of the leather; S35: After the acoustic wave treatment is completed, remove the leather from the equipment and let it stand for 5 minutes to relieve internal stress; S4: Perform hot pressing treatment, and seal the gaps between the leather fibers by controlling the temperature and pressure; Specifically, this includes: S41: Place the leather treated by S3 in the hot pressing equipment and ensure that the leather is flat and wrinkle-free; S42: Set the target temperature of the hot pressing equipment to 70℃ to 90℃ and preheat the equipment to the target temperature; S43: Set the hot pressing pressure to 5 kHz. MPa: Place the leather between hot press plates and gradually apply pressure; S44: Maintain temperature and pressure while hot-pressing the leather for 10 minutes; S45: During the process, check the temperature and pressure of the hot press plates every 5 minutes to ensure stability; S46: After hot-pressing, gradually reduce the pressure to zero and remove the leather from the hot press equipment, laying it flat to cool; S5: Cool and cure the hot-pressed leather to stabilize its structure; specifically including: S51: Remove the leather after S4 hot-pressing from the hot press equipment and quickly lay it flat on a cooling rack; S52: Use a blower to cool the leather, controlling the cooling temperature between 20℃ and 25℃ for 30 minutes; S53: After cooling, transfer the leather to a curing chamber. The curing chamber temperature is controlled between 25℃ and 30℃, and the relative humidity is maintained at 40%-50%; S54: The leather is left to stand in the curing chamber for 24 hours to allow the internal structure of the leather to gradually stabilize; S55: During the curing process, the temperature and humidity of the curing chamber are checked and recorded every 4 hours to ensure stable environmental conditions; S6: The cured leather is filled with nano-level fillers to increase its density and compressive strength; Specifically, this includes: S61: The cured leather from S5 is laid flat on the coating table to ensure it is flat; S62: A nano-level filler solution is prepared, with silane compounds selected as the nano-fillers, and the solution concentration is controlled at 5%-10%; S63: The nano-level fillers are evenly sprayed onto the leather surface using a spraying device, with the spray thickness controlled at 0.1-0.2 mm; S64: Place the sprayed leather in a constant temperature chamber, controlling the temperature at 30℃ to 40℃, and let it stand for 2 hours to ensure the filler fully penetrates and cures; S65: After the filling treatment is completed, the leather undergoes a second drying process, using a blower at a temperature of 25℃ to 30℃ for 1 hour; S7: Apply a final surface coating to the filled leather to form a protective layer.

2. The processing technology for improving the cracking susceptibility of leather bags according to claim 1, characterized in that, The selection of raw leather in S1 includes cowhide, sheepskin, or pigskin.

3. The processing technology for improving the cracking susceptibility of leather bags according to claim 1, characterized in that, The preliminary treatment in S1 specifically includes: S11: mechanically cleaning the raw leather by scraping and brushing to remove surface mud and impurities; S12: chemically cleaning the mechanically cleaned leather by soaking it in a 5%-10% weak alkaline solution for 10-20 minutes to thoroughly remove residual impurities; S13: drying the cleaned leather by blowing it with a blower at a temperature of 30°C to 40°C for 1-2 hours; S14: spraying the dried leather with purified water to adjust the moisture content of the leather to 12%-15% to ensure even absorption.

4. The processing technology for improving the cracking susceptibility of leather bags according to claim 1, characterized in that, S2 specifically includes: S21: preparing a natural plant oil solution by mixing plant oil with water at a mass ratio of 15%-20% and stirring until a stable emulsion is formed; S22: completely immersing the leather treated in S1 in the natural plant oil solution, ensuring that the solution fully covers the surface of the leather; S23: controlling the soaking temperature at 20℃ to 25℃ and maintaining a constant temperature for 36 hours; S24: stirring the solution every 6 hours during the soaking process; S25: after soaking, removing the leather from the solution and shaking it dry to remove excess plant oil solution from the surface.

5. The processing technology for improving the cracking susceptibility of leather bags according to claim 1, characterized in that, S7 specifically includes: S71: placing the leather after the filling treatment in S6 on a coating machine to ensure the leather is flat and wrinkle-free; S72: preparing a polymer coating solution containing 3%-5% of UV-resistant and antioxidant compounds; S73: using a coating machine to evenly coat the polymer coating solution onto the leather surface, with the coating thickness controlled at 0.3-0.5 mm; S74: placing the coated leather in a drying room at a temperature controlled at 50℃ to 60℃ for 1-2 hours to ensure the coating is fully cured; S75: after drying, cooling the leather by placing it in a room temperature environment for 30 minutes to stabilize the coating.

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