Bag production method capable of randomly changing appearance and function

Abstract

The invention discloses a bag production method capable of randomly changing appearances and functions, which comprises the following steps: S1, designing various appearance and function combination schemes according to user requirements and market trends, and realizing different appearances and functions in each scheme by replacing coverings or accessories on the surface of a bag body; s2, cutting the base material into a required shape according to the designed combination scheme, arranging a connecting structure on the surface of the base material, and fixing the covering on the base material through the connecting structure to form a complete bag body; s3, performing appearance and function testing on the finished bag body to ensure that the bag body meets the design requirements and can be normally used; and S4, the qualified bag body is subjected to cleaning and drying treatment, and then packaging and shipping are conducted. According to the invention, bags and magnets are systematically combined and produced, so that the bag surface has a magnetic attraction function in a large range or on the whole, and the bag surface can be combined with other magnetic attraction function products, so that the style, color and function can be randomly changed.

Description

Technical Field

[0001] The invention belongs to the field of bag production, and more specifically, particularly relates to a method for producing bags whose appearance and functions can be changed at will. Background Art

[0002] With the ever-changing fashion trends and the diversification of consumer demand, the bag market is highly diversified. At present, bags of different styles, colors and functions face many challenges in the production process. Since each new style needs to be redesigned, developed and produced, it leads to a lot of waste of manpower, material resources, output and time, and also increases production costs, which is not conducive to environmental protection.

[0003] Specifically, the traditional packaging production model has the following main problems:

[0004] 1. High design and development costs: Every time a new product is launched, a lot of market research, design sketching, sample production and testing are required. These processes are not only time-consuming but also costly.

[0005] 2. Low production efficiency: Since each new style requires reconfiguration of the production line and adjustment of production process parameters, this greatly reduces production efficiency and prolongs product time to market.

[0006] 3. Difficulty in inventory management: Diverse product styles make inventory management complicated, which can easily lead to a backlog of slow-moving products or a shortage of hot-selling products, affecting the company's operational efficiency.

[0007] 4. Not environmentally friendly: Frequent replacement of production lines and large-scale use of raw materials lead to serious waste of resources and do not meet the requirements of sustainable development.

[0008] 5. Slow market response: Under the traditional model, it takes a long time from design to final product launch, making it difficult to respond quickly to market changes and consumer demands.

[0009] Therefore, how to improve the flexibility and efficiency of bag production, reduce production costs, and reduce resource waste has become a problem that needs to be solved urgently. Summary of the invention

[0010] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for producing bags whose appearance and functions can be changed at will. By systematically combining bags with magnets, the bag surface has a large range or the whole has a magnetic suction function, and can be combined with other magnetic suction function products to achieve the effect that the style, color and function can be changed at will.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A method for producing a bag whose appearance and function can be changed at will, comprising the following steps:

[0013] S1. Design a variety of appearance and function combination solutions according to user needs and market trends. Each solution can achieve different appearance and functions by replacing the cover or accessories on the surface of the package;

[0014] S2, cutting the substrate into a desired shape according to the designed combination scheme, and then setting a connecting structure on the surface of the substrate, fixing the covering on the substrate through the connecting structure to form a complete package;

[0015] S3. Perform appearance and function tests on the completed package to ensure that it meets the design requirements and can be used normally;

[0016] S4. After cleaning and drying the qualified packages, they are packaged and shipped.

[0017] Preferably, step S2 specifically comprises:

[0018] S21, pattern making, standardizing paper grid and cutting pieces, adding the process of magnet range, position, size and arrangement to the traditional pattern making and paper grid determination process; the magnet thickness range is 1mm~30mm, and the width is 1mm~100mm;

[0019] S22. Press the unmagnetized magnets and the bag body fabric together by using a pressing mold, so that the entire bag surface has a magnetic attraction function.

[0020] Preferably, step S3 specifically comprises:

[0021] S31. Perform an appearance inspection to ensure that the package surface is flawless, the color is uniform, and the covering or accessories are properly fixed and positioned accurately;

[0022] S32. Perform functional tests, including magnetic attraction function tests and convenience tests for replacing covers, to ensure that the adsorption force of the magnets meets the design requirements and that the covers can be easily replaced;

[0023] S33, conduct durability tests to simulate various situations in daily use, such as friction, pulling, load, etc., to ensure the durability and practicality of the bag;

[0024] S34. Conduct safety tests to check whether there is a risk of the magnet falling off and ensure that it will not cause harm to the user during use.

[0025] Preferably, step S1 specifically comprises:

[0026] S11. Market research to understand the current trends in the bag market, consumer preferences, and potential market demand. At the same time, collect feedback and suggestions from the target user groups to clarify their expectations for the appearance and functions of bags;

[0027] S12. Based on the market research results, the design team began to create creative designs and developed a variety of appearance and function combination solutions;

[0028] S13. Summarize and evaluate all design solutions. The evaluation criteria include design feasibility, market attractiveness, and cost-effectiveness. Based on the evaluation results, select the most promising and market-competitive design solutions for further optimization.

[0029] S14. According to the selected design, make a sample package and conduct comprehensive appearance and functional tests on the sample package, including the stability of the magnetic suction function, the convenience of replacing the cover, durability and safety.

[0030] Preferably, the evaluation in step S13 is specifically calculated as follows:

[0031] There are n design options, and the scores of each option i in terms of feasibility, market attractiveness, and cost-effectiveness are F i 、MA i and CBR i , then the total score of solution i is S i It can be calculated by the following formula:

[0032] S i =w f F i +w ma MA i +w cbr CBR i ;

[0033] In the formula, w f 、w ma and w cbr are the weights of feasibility, market attractiveness and cost-effectiveness ratio, and the sum of the weights is 1.

[0034] Preferably, the appearance inspection in step S31 includes:

[0035] 1) Defect inspection: Use visual inspection or a magnifying glass to inspect the surface of the package area by area, record the scratches, stains, bubbles, and uneven stitching found, and calculate the defect ratio. The calculation formula is:

[0036]

[0037] If the defective area accounts for more than 3%, it is judged as a defective product and will be returned for repair or scrapped.

[0038] 2) Color uniformity inspection: measure the color of the package at different positions and record the Lab value, where L represents brightness, a represents red-green color, and b represents yellow-blue color. Compare the color difference between the measurement points. The expression is:

[0039]

[0040] In the formula, ΔE represents the color difference value, and the threshold value of ΔE is 1.0, that is, ΔE greater than or equal to 1.0 is considered a color difference and a defective product is returned for repair or scrapped;

[0041] Preferably, the magnetic attraction function test in S32 is specifically as follows:

[0042] S321. Randomly select a number of package samples from the production batch and set the standard adsorption force value of the magnet according to the design requirements;

[0043] S322, using a tensile tester to perform a standard strength test on the magnet on the package body, and recording the test data;

[0044] S323, comparing the test data with the standard adsorption force value to determine whether the adsorption force of the magnet meets the design requirements;

[0045] S324. Visually check whether the position of the magnet on the package is correct and whether there is any deviation or looseness;

[0046] S325. Repeat the above test 3-5 times for each sample and take the average value as the final result.

[0047] Preferably, the convenience test of replacing the cover in S32 is specifically as follows:

[0048] Explain in detail to the testers the steps, precautions and procedures for replacing the cover;

[0049] Select users of different ages, genders, and hand strength to participate in the test to ensure the wide applicability of the test results. Let users follow the operating steps to replace the cover by themselves, and record the time required and the difficulty of the operation;

[0050] Count the average time required for all test users to complete the replacement of the cover, analyze the problems and difficulties encountered by users during the operation, and put forward improvement suggestions;

[0051] Write a test summary report including test data, user feedback and improvement suggestions.

[0052] Preferably, step S4 is specifically:

[0053] S41. Gently wipe the surface and interior of the bag with a soft cloth or brush to remove dust and impurities. Use a deodorizer or place an activated carbon bag to remove odors inside the bag.

[0054] S42. Place the cleaned bag in a well-ventilated place and avoid direct sunlight to prevent aging or discoloration of the material. Determine the appropriate drying time based on the material and thickness of the bag to ensure complete drying;

[0055] S43. Check the appearance of the package again to ensure there are no scratches, stains or other defects, and simply test the functions of the package to ensure normal use;

[0056] S44. According to the size and shape of the package, select appropriate packaging materials, print product labels including brand, model, size, color, and production date, and then ship.

[0057] Technical effects and advantages of the present invention: The present invention provides a method for producing a bag whose appearance and function can be changed at will. Compared with the traditional process, the present invention has the following advantages:

[0058] Improve production efficiency. Through modular design and standardized production processes, the design and development time is greatly reduced, and production efficiency is improved. Each design scheme can achieve different appearances and functions by replacing covers or accessories, avoiding the waste of repeated design and production.

[0059] Reduce costs. Use a unified base material and connection structure to reduce the use of raw materials and reduce production costs. At the same time, since the production process is more simplified and efficient, labor costs are also effectively controlled.

[0060] Improve product quality by conducting comprehensive appearance and functional tests on the finished bag to ensure that each product meets the design requirements and can be used normally; in particular, the stability of the magnetic suction function and the convenience of replacing the cover are tested to ensure the durability and practicality of the product;

[0061] Enhance market competitiveness. Diversified design combinations can meet the needs of different consumers and respond quickly to market changes. Through market research and user feedback, we continuously optimize product design and improve the market appeal and competitiveness of products.

[0062] Promote environmental protection, reduce resource waste caused by frequent replacement of production lines, and meet the requirements of sustainable development; use environmentally friendly materials and technologies to reduce the impact on the environment;

[0063] Improve user experience. Users can easily change the appearance and function of the package according to their preferences and needs, which increases the fun and personalized experience of the product. The convenient replacement method also improves user satisfaction.

[0064] High safety, through strict durability and safety tests to ensure that it will not cause harm to users during use; the reasonable layout and firm fixation of the magnets avoid the risk of falling off;

[0065] Flexible response to market demand, through simple operations to achieve the diversification of bag products, enterprises can quickly adjust production plans according to market demand and reduce inventory pressure;

[0066] Easy to maintain and upgrade. If the product needs maintenance or upgrading, it is only necessary to replace the corresponding cover or accessories without reproducing the entire package, saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 This is a schematic diagram of the package structure in an embodiment of the present invention;

[0068] Figure 2 It is a schematic diagram of the structure of a pressed abrasive tool in an embodiment of the present invention;

[0069] Figure 3 This is a schematic diagram of the structure of bag fabrics in an embodiment of the present invention;

[0070] Figure 4 The present invention is a flow chart of a method for producing a bag that can change appearance and function at will. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0072] The present invention provides Figure 1-4 A method for producing a bag whose appearance and function can be changed at will comprises the following steps:

[0073] S1. According to user needs and market trends, design a variety of appearance and function combination solutions, each of which can achieve different appearances and functions by replacing the cover or accessories on the surface of the package; step S1 is specifically as follows:

[0074] S11. Market research to understand the current trends in the bag market, consumer preferences, and potential market demand. At the same time, collect feedback and suggestions from the target user groups to clarify their expectations for the appearance and functions of bags;

[0075] S12. Based on the market research results, the design team began to create creative designs and developed a variety of appearance and function combination solutions;

[0076] S13, all design solutions are summarized and evaluated. The evaluation criteria include design feasibility, market attractiveness, and cost-effectiveness. Based on the evaluation results, the most promising and market-competitive design solutions are selected for further optimization. The evaluation in step S13 is specifically calculated as follows:

[0077] There are n design options, and the scores of each option i in terms of feasibility, market attractiveness, and cost-effectiveness are F i 、MA i and CBR i , then the total score of solution i is S i It can be calculated by the following formula:

[0078] S i =w f F i +w ma MA i +w cbr CBR i ;

[0079] In the formula, w f 、w ma and w cbr are the weights of feasibility, market attractiveness and cost-effectiveness ratio, and the sum of the weights is 1;

[0080] For example, the weight assignment w f =0.3, w ma =0.5, w cbr =0.2, the scheme is shown in the following table:

[0081]

[0082] The total score of each solution is calculated as follows:

[0083] SA=0.3×8+0.5×7+0.2×9=2.4+3.5+1.8=7.7;

[0084] SB=0.3×6+0.5×9+0.2×8=1.8+4.5+1.6=7.9;

[0085] SC=0.3×9+0.5×6+0.2×7=2.7+3.0+1.4=7.1;

[0086] According to the calculated total score, Option B scored the highest, indicating that it is the best choice after comprehensively considering feasibility, market attractiveness and cost-effectiveness ratio.

[0087] S14. Produce sample packages according to the selected design scheme, and conduct comprehensive appearance and functional tests on the sample packages, including the stability of the magnetic suction function, the convenience of replacing the cover, durability and safety;

[0088] S2, cutting the substrate into a desired shape according to the designed combination scheme, and then setting a connecting structure on the surface thereof, fixing the covering on the substrate through the connecting structure to form a complete package; step S2 is specifically as follows:

[0089] S21, pattern making, standardizing paper grid and cutting pieces, adding the process of magnet range, position, size and arrangement to the traditional pattern making and paper grid determination process; the magnet thickness range is 1mm~30mm, and the width is 1mm~100mm;

[0090] S22, pressing the unmagnetized magnets and the bag body fabric by a pressing mold, so that the entire bag surface has a magnetic attraction function;

[0091] S3, perform appearance and function tests on the completed package to ensure that it meets the design requirements and can be used normally; step S3 is specifically as follows:

[0092] S31, perform an appearance inspection to ensure that the package body surface is flawless, the color is uniform, and the cover or accessories are properly fixed and positioned accurately; the appearance inspection in step S31 includes:

[0093] 1) Defect inspection: Use visual inspection or a magnifying glass to inspect the surface of the package area by area, record the scratches, stains, bubbles, and uneven stitching found, and calculate the defect ratio. The calculation formula is:

[0094]

[0095] If the defective area accounts for more than 3%, it is judged as a defective product and will be returned for repair or scrapped.

[0096] 2) Color uniformity inspection: measure the color of the package at different positions and record the Lab value, where L represents brightness, a represents red-green color, and b represents yellow-blue color. Compare the color difference between the measurement points. The expression is:

[0097]

[0098] In the formula, ΔE represents the color difference value, and the threshold value of ΔE is 1.0, that is, ΔE greater than or equal to 1.0 is considered a color difference and a defective product is returned for repair or scrapped;

[0099] S32, perform functional tests, including magnetic attraction function tests and convenience tests for replacing covers, to ensure that the adsorption force of the magnet meets the design requirements and the covers can be easily replaced; the magnetic attraction function tests in S32 are specifically as follows:

[0100] S321. Randomly select a number of package samples from the production batch and set the standard adsorption force value of the magnet according to the design requirements;

[0101] S322, using a tensile tester to perform a standard strength test on the magnet on the package body, and recording the test data;

[0102] S323, comparing the test data with the standard adsorption force value to determine whether the adsorption force of the magnet meets the design requirements;

[0103] S324. Visually check whether the position of the magnet on the package is correct and whether there is any deviation or looseness;

[0104] S325. Repeat the above test 3-5 times for each sample and take the average value as the final result;

[0105] S33, conduct durability tests to simulate various situations in daily use, such as friction, pulling, load, etc., to ensure the durability and practicality of the bag;

[0106] Furthermore, the specific process of durability testing includes:

[0107] Friction test

[0108] Purpose: To simulate the friction between the package and external objects in daily use and test its surface wear resistance.

[0109] Method: Use a dedicated friction test device, set different friction strengths and times, and perform friction tests on the package surface.

[0110] Steps: Prepare the test sample and ensure that the surface is clean and free of stains; set the parameters of the friction test equipment; fix the sample on the test equipment and start the test; observe and record the wear of the sample surface and evaluate its wear resistance.

[0111] Pull test

[0112] Purpose: To test the tensile strength of the package and its connections to ensure that they will not be damaged by pulling during use.

[0113] Method: Use a tensile testing machine to perform a tensile test on the handles and shoulder straps of the bag.

[0114] Steps: Prepare the test sample and ensure that all connections are firm; set the parameters of the tensile testing machine; fix the sample on the testing machine and start the test; record the deformation and breaking point of the sample under different tensile forces to evaluate its tensile strength.

[0115] Weight test

[0116] Purpose: To test the stability and durability of the bag when carrying heavy objects, to ensure that it can bear the expected weight.

[0117] Method: Put items of a certain weight into the bag and observe the shape changes and structural stability of the bag.

[0118] Steps: Prepare the test sample and ensure that the interior is clean and free of debris; according to the design requirements, select appropriate weights (sandbags, water bottles) and put them into the bag; observe and record the shape changes and structural stability of the bag under different loads; evaluate its load-bearing capacity and stability.

[0119] Comprehensive durability test

[0120] Purpose: To simulate various situations in daily use and comprehensively evaluate the durability and practicality of the bag.

[0121] Methods: A comprehensive battery of tests was performed combining friction, pulling, and weight-bearing tests.

[0122] Steps: Prepare multiple test samples and ensure that each sample passes the preliminary inspection; conduct friction, pulling and load tests in sequence, and record the performance of each sample; analyze all test data, identify potential weak links, and make improvement suggestions; based on the test results, optimize product design and production processes to improve product durability.

[0123] User simulation test

[0124] Purpose: To further verify the performance of the package in actual use through simulated use by real users.

[0125] Method: Invite users of different ages, genders, and hand strength to participate in the test to simulate daily usage scenarios.

[0126] Steps: Explain the test purpose and operation process in detail to the testers; distribute test samples and let the testers operate according to their daily usage habits; observe and record the problems and feedback encountered by the testers during use; compile all test data, analyze user satisfaction and product performance, and put forward improvement suggestions.

[0127] Environmental adaptability test

[0128] Purpose: To test the performance of the package under different environmental conditions, such as high temperature, low temperature, and humidity.

[0129] Method: Place the package under different environmental conditions and observe the changes in its performance.

[0130] Steps: Prepare test samples and ensure that the samples are in consistent state; place the samples in high temperature, low temperature and high humidity environments, respectively, and set different exposure times; observe and record the performance changes of the samples in these environments, such as color, shape, and material; evaluate their environmental adaptability and make improvement suggestions.

[0131] Durability cycle test

[0132] Purpose: To test the long-term durability of the package through repeated use.

[0133] Method: Simulate the user's daily usage behavior and perform multiple cycle tests on the package.

[0134] Steps: Prepare multiple test samples and ensure that each sample has passed the preliminary inspection; simulate the user's daily use behavior, such as opening and closing the zipper, lifting and placing, and conduct multiple cycle tests; observe and record the state changes of the sample after each cycle; analyze all test data, evaluate its long-term durability, and make improvement suggestions.

[0135] Through the above detailed durability testing process, the performance of the bag in daily use can be comprehensively evaluated to ensure its durability and practicality, thereby improving product quality and user satisfaction.

[0136] S34. Conduct safety tests to check whether the magnets have the risk of falling off and ensure that they will not cause harm to users during use;

[0137] S4: After the qualified packages are cleaned and dried, they are packaged and shipped. Step S4 is specifically as follows:

[0138] S41. Gently wipe the surface and interior of the bag with a soft cloth or brush to remove dust and impurities. Use a deodorizer or place an activated carbon bag to remove odors inside the bag.

[0139] S42. Place the cleaned bag in a well-ventilated place and avoid direct sunlight to prevent aging or discoloration of the material. Determine the appropriate drying time based on the material and thickness of the bag to ensure complete drying;

[0140] S43. Check the appearance of the package again to ensure there are no scratches, stains or other defects, and simply test the functions of the package to ensure normal use;

[0141] S44. According to the size and shape of the package, select appropriate packaging materials, print product labels including brand, model, size, color, and production date, and then ship.

[0142] It should be noted that in the production method of bags whose appearance and functions can be changed at will, the roller or pressed mold needs to be customized in accordance with the magnet matrix arrangement on the paper grid. The 3-B concave position corresponds to the matrix arrangement requirements of the magnet layer and the size of the magnet. At the same time, the composite bag material and the magnet thickness are considered. When customizing the mold, the matching parameters of the 3-B concave position must be adjusted to match the bag material hot-pressed composite thick bag front and back effects. During production, the B pressed mold layer and the C pressed mold layer (B\C can be rolled or sheet-type according to production requirements) hot-press D / E / F / G together to form a new bag material form. During composite production, the mold temperature, pressure, and time parameters need to be adjusted according to the different thickness and properties of the bag material. The temperature value is: 50℃~300℃.

[0143] The effect of the composite production and processing of bag-type cut fabrics. The front of the fabric is flat after processing, and the appearance is no different from normal fabrics. The back of the fabric has a concave and convex feeling after the matrix magnet is composited. According to product requirements, a layer of foam material can be composited on the back of the fabric to make the back of the fabric flat. The composited cut pieces are sewn into a complete bag shape. 5-A is the front of the bag after sewing. 5-B indicates that the front material is composited with a magnet layer. 5-C / 5-D are accessories with magnetic suction function, and there is a composite magnet layer at the bottom.

[0144] In summary, the present invention has the following advantages:

[0145] Improve production efficiency. Through modular design and standardized production processes, the design and development time is greatly reduced, and production efficiency is improved. Each design scheme can achieve different appearances and functions by replacing covers or accessories, avoiding the waste of repeated design and production.

[0146] Reduce costs. Use a unified base material and connection structure to reduce the use of raw materials and reduce production costs. At the same time, since the production process is more simplified and efficient, labor costs are also effectively controlled.

[0147] Improve product quality by conducting comprehensive appearance and functional tests on the finished bag to ensure that each product meets the design requirements and can be used normally; in particular, the stability of the magnetic suction function and the convenience of replacing the cover are tested to ensure the durability and practicality of the product;

[0148] Enhance market competitiveness. Diversified design combinations can meet the needs of different consumers and respond quickly to market changes. Through market research and user feedback, we continuously optimize product design and improve the market appeal and competitiveness of products.

[0149] Promote environmental protection, reduce resource waste caused by frequent replacement of production lines, and meet the requirements of sustainable development; use environmentally friendly materials and technologies to reduce the impact on the environment;

[0150] Improve user experience. Users can easily change the appearance and function of the package according to their preferences and needs, which increases the fun and personalized experience of the product. The convenient replacement method also improves user satisfaction.

[0151] High safety, through strict durability and safety tests to ensure that it will not cause harm to users during use; the reasonable layout and firm fixation of the magnets avoid the risk of falling off;

[0152] Flexible response to market demand, through simple operations to achieve the diversification of bag products, enterprises can quickly adjust production plans according to market demand and reduce inventory pressure;

[0153] Easy to maintain and upgrade. If the product needs maintenance or upgrading, it is only necessary to replace the corresponding cover or accessories without reproducing the entire package, saving time and cost.

[0154] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing a bag whose appearance and function can be changed at will, characterized in that: The steps include: S1. Design a variety of appearance and function combination solutions according to user needs and market trends. Each solution can achieve different appearance and functions by replacing the cover or accessories on the surface of the package; S2, cutting the substrate into a desired shape according to the designed combination scheme, and then setting a connecting structure on the surface of the substrate, fixing the covering on the substrate through the connecting structure to form a complete package; S3. Perform appearance and function tests on the completed package to ensure that it meets the design requirements and can be used normally; S4. After cleaning and drying the qualified packages, they are packaged and shipped.

2. A method for producing a bag with a freely changeable appearance and function according to claim 1, characterized in that: Step S2 is specifically as follows: S21, pattern making, standardizing paper grid and cutting pieces, adding the process of magnet range, position, size and arrangement to the traditional pattern making and paper grid determination process; the magnet thickness range is 1mm~30mm, and the width is 1mm~100mm; S22. Press the unmagnetized magnets and the bag body fabric together by using a pressing mold, so that the entire bag surface has a magnetic attraction function.

3. The method for producing a bag with a freely changeable appearance and function according to claim 1, characterized in that: Step S3 is specifically as follows: S31. Perform an appearance inspection to ensure that the package surface is flawless, the color is uniform, and the covering or accessories are properly fixed and positioned accurately; S32. Perform functional tests, including magnetic attraction function tests and convenience tests for replacing covers, to ensure that the adsorption force of the magnets meets the design requirements and that the covers can be easily replaced; S33, conduct durability tests to simulate various situations in daily use, such as friction, pulling, load, etc., to ensure the durability and practicality of the bag; S34. Conduct safety tests to check whether there is a risk of the magnet falling off and ensure that it will not cause harm to the user during use.

4. The method for producing a bag with a freely changeable appearance and function according to claim 1, characterized in that: Step S1 is specifically as follows: S11. Market research to understand the current trends in the bag market, consumer preferences, and potential market demand. At the same time, collect feedback and suggestions from the target user groups to clarify their expectations for the appearance and functions of bags; S12. Based on the market research results, the design team began to create creative designs and developed a variety of appearance and function combination solutions; S13. Summarize and evaluate all design solutions. The evaluation criteria include design feasibility, market attractiveness, and cost-effectiveness. Based on the evaluation results, select the most promising and market-competitive design solutions for further optimization. S14. According to the selected design, make a sample package and conduct comprehensive appearance and functional tests on the sample package, including the stability of the magnetic suction function, the convenience of replacing the cover, durability and safety.

5. A method for producing a bag with a freely changeable appearance and function according to claim 4, characterized in that: The evaluation in step S13 is specifically calculated as follows: There are n design options, and the scores of each option i in terms of feasibility, market attractiveness, and cost-effectiveness are F i 、MA i and CBR i , then the total score of solution i is S i It can be calculated by the following formula: S i =in f F i +in ma M.A. i +in cbr CBR i ; In the formula, w f 、w ma and w cbr are the weights of feasibility, market attractiveness and cost-effectiveness ratio, and the sum of the weights is 1.

6. The method for producing a bag with a freely changeable appearance and function according to claim 3, characterized in that: The appearance inspection in step S31 includes: 1) Defect inspection: Use visual inspection or a magnifying glass to inspect the surface of the package area by area, record the scratches, stains, bubbles, and uneven stitching found, and calculate the defect ratio. The calculation formula is: If the defective area accounts for more than 3%, it is judged as a defective product and will be returned for repair or scrapped. 2) Color uniformity inspection: measure the color of the package at different positions and record the Lab value, where L represents brightness, a represents red-green color, and b represents yellow-blue color. Compare the color difference between the measurement points. The expression is: Wherein, ΔE represents the color difference value, and the threshold value of ΔE is 1.0, that is, when ΔE is greater than or equal to 1.0, it is judged as a color difference and a defective product, which is returned for repair or scrapped.

7. A method for producing a bag with a freely changeable appearance and function according to claim 6, characterized in that: The magnetic attraction function test in S32 is specifically as follows: S321. Randomly select a number of package samples from the production batch and set the standard adsorption force value of the magnet according to the design requirements; S322, using a tensile tester to perform a standard strength test on the magnet on the package body, and recording the test data; S323, comparing the test data with the standard adsorption force value to determine whether the adsorption force of the magnet meets the design requirements; S324. Visually check whether the position of the magnet on the package is correct and whether there is any deviation or looseness; S325. Repeat the above test 3-5 times for each sample and take the average value as the final result.

8. The method for producing a bag with freely changeable appearance and function according to claim 7, characterized in that: The convenience test of replacing the covering in S32 is specifically as follows: Explain in detail to the testers the steps, precautions and procedures for replacing the cover; Select users of different ages, genders, and hand strength to participate in the test to ensure the wide applicability of the test results. Let users follow the operating steps to replace the cover by themselves, and record the time required and the difficulty of the operation; Count the average time required for all test users to complete the replacement of the cover, analyze the problems and difficulties encountered by users during the operation, and put forward improvement suggestions; Write a test summary report including test data, user feedback and improvement suggestions.

9. The method for producing a bag with freely changeable appearance and function according to claim 1, characterized in that: Step S4 is specifically as follows: S41. Gently wipe the surface and interior of the bag with a soft cloth or brush to remove dust and impurities. Use a deodorizer or place an activated carbon bag to remove odors inside the bag. S42. Place the cleaned bag in a well-ventilated place and avoid direct sunlight to prevent aging or discoloration of the material. Determine the appropriate drying time based on the material and thickness of the bag to ensure complete drying; S43. Check the appearance of the package again to ensure there are no scratches, stains or other defects, and simply test the functions of the package to ensure normal use; S44. According to the size and shape of the package, select appropriate packaging materials, print product labels including brand, model, size, color, and production date, and then ship.

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