Dry powder bag making process

Abstract

The invention belongs to the technical field of dry powder bags, and discloses a dry powder bag making process which comprises the following steps: (S1) during raw material preparation, selecting a specific material and proper gram weight according to the use requirement and environment of a dry powder bag, and laying foundation for the performance of a bag body; during heating (S2), setting temperature according to different layers, accurately controlling to soften the material properly, and performing thermal forming (S3) to form a bag body shape. (S4) enhancing the strength of key parts by using an aramid fiber fabric; (S5) after cleaning pretreatment, ultrasonic welding is carried out, and then detection is carried out to guarantee the quality; (S6) selecting a nano coating, controlling the thickness, drying and curing, and enhancing the moisture-proof and damage-resistant capability; (S7) testing the sealing and the strength by applying pressure to ensure the reliability and the safety of the product; the technology guarantees the quality, performance and reliability of the dry powder bag through multi-aspect cooperation from material selection to processing control to detection so as to adapt to different scene requirements.

Description

Technical Field

[0001] The present application relates to the technical field of dry powder bags, and more specifically, to a dry powder bag making process. Background Art

[0002] Many dry powder bags are made of flexible materials and are easily damaged when subjected to large external forces (such as squeezing, collision, falling, etc.).

[0003] Especially during transportation and handling, if the operation is improper or encounters harsh environmental conditions, the risk of bag damage will increase, causing dry powder leakage, affecting use and possibly causing waste and pollution.

[0004] Some dry powder bags need to be connected to connectors or other components and the bag body by welding. However, the flexible bag body is relatively thin and the welding process is relatively difficult.

[0005] The bag needs to be opened during welding, which not only increases the complexity of the operation, but also easily leads to poor sealing after welding, affecting the overall quality and performance of the dry powder bag; and this complex welding process is not conducive to automated assembly, reducing production efficiency.

[0006] To this end, the present application proposes a dry powder bag making process to solve the above-mentioned problems.

[0007] Application Contents

[0008] In order to solve the above problems, the present application provides a dry powder bag making process.

[0009] The dry powder bag making process provided in this application adopts the following technical solution:

[0010] A dry powder bag making process, the process comprising the following steps:

[0011] S1. First, prepare the raw materials. The outer layer, middle layer and inner layer of the dry powder bag are made of high-strength polyethylene, nylon and polyethylene respectively, and the gram weight is selected according to the size of the dry powder bag;

[0012] S2, heating each layer of raw materials;

[0013] S3, processing the raw materials heated in step S2 through a thermoforming process, placing the prepared composite material into a mold, and forming the basic shape of the bag body, including the bottom and sides, by vacuum adsorption and pressure molding;

[0014] S4, covering the outer layer of the bag obtained in step S3 with a reinforcing layer, wherein the raw material of the reinforcing layer is aramid fiber fabric;

[0015] S5. Weld the connector to the bag body, clean and pre-treat the welding parts of the bag body and the connector to ensure that the welding surface is flat, clean, and free of oil and impurities; use ultrasonic welding technology to accurately weld the connector to the opening of the bag body; the connector must be made of materials that are highly compatible with the bag body material;

[0016] S6. Spraying a moisture-proof coating on the inside of the bag body by spraying;

[0017] S7. Perform appearance inspection and sealing test on the surface of the bag, and perform sealing test on dry powder bags with intact appearance.

[0018] Furthermore, the heating conditions of each raw material in step S2 are as follows:

[0019] Outer layer: heating temperature is controlled at 180-200℃, heating time is 30-60 seconds;

[0020] Middle layer: heating temperature is controlled at 200-220℃, heating time is 40-70 seconds;

[0021] Inner layer: The heating temperature is controlled at 170-190℃ and the heating time is 25-50 seconds.

[0022] Furthermore, the size of the reinforcement layer in step S4 is determined according to the size of the bag body, the bottom reinforcement layer is 1 / 2-2 / 3 of the bag bottom area, and the reinforcement layer at the corner is a triangle with a side length of 5-8 cm.

[0023] Through the above technical solution, it is possible to ensure that the raw materials reach an appropriate softening degree during the heating process, provide a good foundation for the subsequent thermoforming process, ensure that the performance of the material can be fully utilized, and avoid problems such as material aging, deformation or performance damage due to improper temperature and time.

[0024] Furthermore, the moisture-proof coating sprayed in step S6 is a nano-silicon dioxide coating, and the thickness of the coating is controlled to be 20-30 μm.

[0025] Through the above technical solution, the strength of the vulnerable parts of the bag is targetedly enhanced, the tear and impact resistance of the dry powder bag is effectively improved, the risk of bag damage during transportation and handling is reduced, and the service life of the dry powder bag is extended.

[0026] Furthermore, after the coating treatment in step S6, a drying treatment is also performed, and the drying temperature is controlled at 80-100° C. and the drying time is 10-15 minutes to ensure that the coating is completely cured to form an effective moisture-proof and anti-caking layer.

[0027] Through the above technical solution, it is ensured that the coating can be completely cured, the moisture-proof and anti-caking effects are enhanced, the coating is more closely bonded to the inner surface of the bag, the stability and durability of the coating are improved, and the quality of the dry powder is further guaranteed.

[0028] Furthermore, the test steps in step S7 are specifically as follows: applying a pressure of 0.2-0.3 MPa to the inside of the dry powder bag and maintaining it for 10-15 minutes, observing whether the bag has leakage, simulating the squeezing, collision and other conditions in actual use, and performing compression and impact resistance tests.

[0029] Through the above technical solution, the sealing and mechanical strength of the dry powder bag can be fully tested to ensure that the product will not leak during actual use and can withstand certain external forces, thereby improving the reliability and safety of the product.

[0030] Furthermore, in step S1, the weight of the outer layer of polyethylene is 80-100 g / m 2 , nylon middle layer weight is 30-50g / m 2 The weight of the inner polyethylene layer is 60-80g / m 2 When selecting the weight, the expected load-bearing weight and usage environment of the dry powder bag must be considered. For dry powder bags that carry heavier dry powder or are used in harsh environments, the weight of each layer of material should be increased accordingly.

[0031] Through the above technical solutions, the weight can be adjusted according to the load and the use environment, making the design of the dry powder bag more scientific and reasonable. For the use of heavy dry powder or in harsh environments, increasing the weight can improve the strength and durability of the bag to meet the needs of different use scenarios.

[0032] Furthermore, in step S5, after the ultrasonic welding is completed, the welding part is microscopically inspected to detect the molecular bonding in the welding area to ensure the welding strength, and at the same time, the welding part is visually inspected to ensure the stability and reliability of the welding quality.

[0033] Through the above technical solution, microscopic inspection and appearance sampling are carried out after ultrasonic welding to ensure the quality of the welding parts. Microscopic inspection of the molecular bonding of the welding area ensures the welding strength, and appearance sampling ensures the stability and reliability of the overall welding quality, reduces the risk of bag leakage or damage caused by welding problems, and improves the product qualification rate.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] (1) Through a series of measures such as the selection of raw materials, heating control of each layer of materials, setting of reinforcement layers, application of moisture-proof coatings and strict quality inspection, the physical properties of dry powder bags, such as strength, flexibility, moisture resistance, and sealing, are comprehensively improved, ensuring that the dry powder bags can effectively protect the dry powder during transportation, storage and use, extend the shelf life of the dry powder, and improve the overall quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Flowchart of this application. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0038] Example:

[0039] The following is combined with Figure 1 This application is described in further detail.

[0040] The present application discloses a dry powder bag making process, which comprises the following steps:

[0041] S1. First, prepare the raw materials. The outer layer, middle layer and inner layer of the dry powder bag are made of high-strength polyethylene, nylon and polyethylene respectively, and the gram weight is selected according to the size of the dry powder bag;

[0042] S2, heating each layer of raw materials;

[0043] S3, processing the raw materials heated in step S2 through a thermoforming process, placing the prepared composite material into a mold, and forming the basic shape of the bag body, including the bottom and sides, by vacuum adsorption and pressure molding;

[0044] S4, covering the outer layer of the bag obtained in step S3 with a reinforcing layer, wherein the raw material of the reinforcing layer is aramid fiber fabric;

[0045] S5. Weld the connector to the bag body, clean and pre-treat the welding parts of the bag body and the connector to ensure that the welding surface is flat, clean, and free of oil and impurities; use ultrasonic welding technology to accurately weld the connector to the opening of the bag body; the connector must be made of materials that are highly compatible with the bag body material;

[0046] S6. Spraying a moisture-proof coating on the inside of the bag body by spraying;

[0047] S7. Perform appearance inspection and sealing test on the surface of the bag, and perform sealing test on dry powder bags with intact appearance.

[0048] See also Figure 1 , the heating conditions of each raw material in step S2 are as follows:

[0049] Outer layer: heating temperature is controlled at 180-200℃, heating time is 30-60 seconds;

[0050] Middle layer: heating temperature is controlled at 200-220℃, heating time is 40-70 seconds;

[0051] Inner layer: The heating temperature is controlled at 170-190℃ and the heating time is 25-50 seconds.

[0052] See also Figure 1 In step S4, the size of the reinforcement layer is determined according to the size of the bag body. The bottom reinforcement layer is 1 / 2-2 / 3 of the bottom area of ​​the bag, and the reinforcement layer at the corner is a triangle with a side length of 5-8 cm. This can ensure that the raw materials reach a suitable softening degree during the heating process, provide a good foundation for the subsequent thermoforming process, ensure that the performance of the material can be fully utilized, and avoid problems such as material aging, deformation or performance damage due to improper temperature and time.

[0053] See also Figure 1 The moisture-proof coating sprayed in step S6 is a nano-silicon dioxide coating, and the thickness of the coating is controlled to be 20-30 μm; the strength of the vulnerable parts of the bag body is targetedly enhanced, the tear resistance and impact resistance of the dry powder bag are effectively improved, the risk of bag damage during transportation and handling is reduced, and the service life of the dry powder bag is extended.

[0054] See also Figure 1 After the coating treatment in step S6, a drying treatment is also performed, and the drying temperature is controlled at 80-100°C and the drying time is 10-15 minutes to ensure that the coating is completely cured to form an effective moisture-proof and anti-caking layer; ensure that the coating can be completely cured, enhance its moisture-proof and anti-caking effects, make the coating more closely bonded to the inner surface of the bag, improve the stability and durability of the coating, and further ensure the quality of the dry powder.

[0055] See also Figure 1 The test steps in step S7 are specifically as follows: applying a pressure of 0.2-0.3MPa to the inside of the dry powder bag and maintaining it for 10-15 minutes, observing whether the bag has leakage, simulating the extrusion, collision and other conditions in actual use, and performing compression and impact tests; it can comprehensively detect the sealing and mechanical strength of the dry powder bag, ensure that the product will not have leakage problems during actual use, and can withstand certain external forces, thereby improving the reliability and safety of the product.

[0056] See also Figure 1 In step S1, the weight of the outer polyethylene layer is 80-100 g / m 2 , nylon middle layer weight is 30-50g / m 2 The weight of the inner polyethylene layer is 60-80g / m 2 , and when choosing the weight, the expected load-bearing weight and the use environment of the dry powder bag need to be considered. For dry powder bags that carry heavier dry powder or are used in harsh environments, the weight of each layer of material should be increased accordingly; the weight should be adjusted according to the load and use environment to make the design of the dry powder bag more scientific and reasonable. For bags that carry heavier dry powder or are used in harsh environments, increasing the weight can improve the strength and durability of the bag and meet the needs of different use scenarios.

[0057] See also Figure 1 In step S5, after ultrasonic welding is completed, the welded parts are microscopically inspected to detect the molecular bonding of the welded area to ensure the welding strength, and the welded parts are visually inspected to ensure the stability and reliability of the welding quality; microscopic inspection and visual inspection are performed after ultrasonic welding to ensure the quality of the welded parts. Microscopic inspection of the molecular bonding of the welded area ensures the welding strength, and the visual inspection ensures the stability and reliability of the overall welding quality, reduces the risk of bag leakage or damage caused by welding problems, and improves the qualified rate of products.

[0058] The implementation principle of a dry powder bag making process in the embodiment of the present application is as follows:

[0059] When preparing raw materials (S1), according to the use requirements and environment of the dry powder bag, select specific materials and appropriate weights to lay the foundation for the performance of the bag. When heating (S2) and setting the temperature according to different layers, accurately control the softening of the material to make it suitable, and use heat to form (S3) into the shape of the bag. The covering reinforcement layer (S4) uses aramid fiber fabric to improve the strength of key parts. The welding connector (S5) is ultrasonically welded after cleaning and pretreatment, and then tested to ensure quality. Spraying moisture-proof coating (S6) selects nano-coatings to control thickness and dry and solidify to enhance moisture-proof and damage resistance. Testing (S7) applies pressure to measure sealing and strength to ensure product reliability and safety.

[0060] This process ensures the quality, performance and reliability of dry powder bags through multi-faceted collaboration, from material selection to processing control and testing, to meet the needs of different scenarios.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dry powder bag making process, characterized in that: The process includes the following steps: S1. First, prepare the raw materials. The outer layer, middle layer and inner layer of the dry powder bag are made of high-strength polyethylene, nylon and polyethylene respectively, and the gram weight is selected according to the size of the dry powder bag; S2, heating each layer of raw materials; S3, processing the raw materials heated in step S2 through a thermoforming process, placing the prepared composite material into a mold, and forming the basic shape of the bag body, including the bottom and sides, by vacuum adsorption and pressure molding; S4, covering the outer layer of the bag obtained in step S3 with a reinforcing layer, wherein the raw material of the reinforcing layer is aramid fiber fabric; S5. Weld the connector to the bag body, clean and pre-treat the welding parts of the bag body and the connector to ensure that the welding surface is flat, clean, and free of oil and impurities; use ultrasonic welding technology to accurately weld the connector to the opening of the bag body; the connector must be made of materials that are highly compatible with the bag body material; S6. Spraying a moisture-proof coating on the inside of the bag body by spraying; S7. Perform appearance inspection and sealing test on the surface of the bag, and perform sealing test on dry powder bags with intact appearance.

2. A dry powder bag making process according to claim 1, characterized in that: The heating conditions of each raw material in step S2 are as follows: Outer layer: heating temperature is controlled at 180-200℃, heating time is 30-60 seconds; Middle layer: heating temperature is controlled at 200-220℃, heating time is 40-70 seconds; Inner layer: The heating temperature is controlled at 170-190℃ and the heating time is 25-50 seconds.

3. The dry powder bag making process according to claim 1, characterized in that: The size of the reinforcement layer in step S4 is determined according to the size of the bag body. The bottom reinforcement layer is 1 / 2-2 / 3 of the bag bottom area, and the reinforcement layer at the corner is a triangle with a side length of 5-8 cm.

4. The dry powder bag making process according to claim 1, characterized in that: The moisture-proof coating sprayed in step S6 is a nano-silicon dioxide coating, and the thickness of the coating is controlled to be 20-30 μm.

5. A dry powder bag making process according to claim 4, characterized in that: After the coating treatment in step S6, a drying treatment is further performed, and the drying temperature is controlled at 80-100° C. and the drying time is 10-15 minutes to ensure that the coating is completely cured to form an effective moisture-proof and anti-caking layer.

6. The dry powder bag making process according to claim 1, characterized in that: The test steps in step S7 are specifically: applying a pressure of 0.2-0.3 MPa to the inside of the dry powder bag and maintaining it for 10-15 minutes, observing whether the bag has leakage, simulating the squeezing, collision and other conditions in actual use, and performing compression and impact resistance tests.

7. The dry powder bag making process according to claim 1, characterized in that: In step S1, the weight of the outer layer of polyethylene is 80-100 g / m 2 , nylon middle layer weight is 30-50g / m 2 The weight of the inner polyethylene layer is 60-80g / m 2 When selecting the weight, the expected load-bearing weight and usage environment of the dry powder bag must be considered. For dry powder bags that carry heavier dry powder or are used in harsh environments, the weight of each layer of material should be increased accordingly.

8. The dry powder bag making process according to claim 1, characterized in that: In step S5, after the ultrasonic welding is completed, the welding part is microscopically inspected to detect the molecular bonding in the welding area to ensure the welding strength, and at the same time, the welding part is visually inspected to ensure the stability and reliability of the welding quality.

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