Warp and weft knitting production process of flexible freight bag

Abstract

The invention discloses a warp and weft knitting production process of a flexible freight bag, and relates to the technical field of flexible freight bags, polypropylene (PP), polyethylene (PE) and polyester (PET) polymer synthetic materials are prepared to ensure the basis of the quality of the flexible freight bag, the content of polypropylene (PP) should be greater than 60%, the content of polyethylene (PE) is controlled between 20% and 30%, and the content of polyester (PET) is less than 10%. The invention has the advantages of double-layer wire drawing process, innovative material and optimized structure, firstly, in the aspect of production process, the invention has the advantages of double-layer wire drawing process, innovative material and optimized structure, firstly, in the aspect of production process, the invention abandons the traditional single-layer wire drawing process and adopts the more advanced double-layer wire drawing process; according to the process, through the combination of the core layer material and the outer layer material, the wear resistance and the aging resistance of the flexible freight bag yarn are remarkably improved, and the core layer material is a high-strength and high-toughness polypropylene (PP) material.

Description

Technical Field

[0001] The invention relates to the technical field of container bags, in particular to a warp and weft weaving production process for container bags. Background Art

[0002] Container bags, also known as flexible container unitized transport packaging bags, are a form of packaging between traditional packaging and bulk transportation. They are mainly used to package various solid powdered and granular materials for mechanized loading, unloading and transportation.

[0003] Traditional container bags on the market mostly use relatively backward production processes, such as single-layer wire drawing and simple weaving. These processes not only have low production efficiency, but also make it difficult to guarantee the quality and performance of the container bags. For example, the single-layer wire drawing process cannot ensure uniform wire diameter, thus affecting the load-bearing capacity and service life of the container bags.

[0004] Traditional container bags on the market are relatively simple in material selection, mainly relying on common polymer materials such as polypropylene and polyethylene. Although these materials have certain strength and wear resistance, they are often unable to cope with special environments or high-demand application scenarios. For example, in outdoor environments, where ultraviolet radiation is strong and temperature fluctuates greatly, ordinary plastic woven container bags are prone to aging or even decomposition and failure.

[0005] Traditional bulk bags on the market often have deficiencies in performance. For example, in terms of weaving density, prestress application, etc., traditional bagging often fails to achieve the desired effect, resulting in insufficient overall structural stability of the bulk bags. In addition, traditional bulk bags are mostly sealed by simple sewing or bonding, which is prone to leakage or damage. Summary of the invention

[0006] The purpose of the present invention is to provide a warp and weft weaving production process for container bags, which has the advantages of double-layer wire drawing technology, innovative materials and optimized structure. First of all, in terms of production technology, the present invention abandons the traditional single-layer wire drawing technology and adopts a more advanced double-layer wire drawing technology. This process achieves a significant improvement in the wear resistance and aging resistance of the container bag wire through the combination of core layer and outer layer materials. The core layer material is made of high-strength and high-toughness polypropylene (PP) material, and the outer layer is made of polyethylene (PE) material with excellent anti-aging and anti-ultraviolet properties. This double-layer structure not only enhances the strength and durability of the wire, but also effectively resists the erosion of the external environment to the container bag, thereby significantly extending the service life of the container bag.

[0007] Secondly, in terms of material selection, the load-bearing capacity, wear resistance and aging resistance of bulk bags are improved by adding reinforcing materials such as nano-silicon oxide powder and glass fiber during the production process of bulk bags, as well as using high-performance coating materials. The addition of nano-silicon oxide powder and glass fiber makes the fiber structure of the bulk bags tighter and stronger, capable of withstanding greater weight and harsher operating environments. The use of high-performance coating materials further enhances the waterproof, moisture-proof and corrosion-resistant capabilities of the bulk bags, enabling them to maintain excellent performance in various complex environments.

[0008] Finally, in the structural design and sealing method of the container bag, a denser weaving method is adopted, reinforcement strips are added, and prestress is applied to improve the overall structural stability of the container bag. These measures make the container bag less likely to deform when bearing heavy objects, and the structure is more solid. At the same time, double stitching technology and hot pressure sealing methods are used to ensure that there is no leakage at the seal, thereby improving the sealing performance of the container bag. This double protection not only effectively prevents leakage and damage of goods during transportation, but also improves the reliability and safety of the container bag, thereby solving the problems in the background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: a warp and weft weaving production process for container bags, the method comprising the following steps:

[0010] S1: Prepare polypropylene (PP), polyethylene (PE) and polyester (PET) polymer synthetic materials to ensure the quality of container bags. The content of polypropylene (PP) should be greater than 60%, the content of polyethylene (PE) should be controlled between 20%-30%, and the content of polyester (PET) should be less than 10%;

[0011] S2: In the wire drawing process, double-layer wire drawing technology is used to ensure that the drawn wire has uniform diameter and high strength. The core layer uses polypropylene (PP) material and the outer layer uses polyethylene (PE) material to enhance the wear resistance and aging resistance of the wire. The wire drawing speed is controlled at 30-50 meters per minute to ensure the continuity and stability of the wire.

[0012] S3: A denser weaving method is used at the edge of the woven bag, with a weaving density of more than 120 strands per inch. Additional reinforcement strips are added with a width of 5 cm and one strip is set every 20 cm along the edge. Prestress is applied during the weaving process, and the prestress value is controlled at 30%-40% of the yield strength of the material. It is made by combining plain weaving and twill weaving. High-performance weaving equipment, such as automated weaving machines, is used to ensure the stability and accuracy of the weaving process. The weaving speed is controlled at 10-15 meters per minute.

[0013] S4: Heat-treat the woven semi-finished product, control the temperature between 120-150℃, and the time for more than 30 minutes. Use high-performance coating materials to treat the surface of the woven bag, and the coating thickness is controlled at 0.2-0.5mm;

[0014] S5: Double stitching technology is used in key parts of container bags, such as buckles and strap connections. The stitch length of each stitch line is less than 0.5cm to ensure that the stitching is firm. The container bags are sealed by hot pressing. The sealing temperature is controlled at 180-200℃ for more than 5 seconds to ensure that there is no leakage at the seal.

[0015] Furthermore, in step S1, reinforcing materials are added, including nano silicon oxide powder (added in an amount of 2% of the total weight of the material), glass fiber (length 5-10 cm, added in an amount of 10% of the total weight of the material), and antioxidant (added in an amount of 0.5% of the total weight of the material).

[0016] Furthermore, in step S2, uniform diameter means an error of ±0.2 mm, and high strength means a breaking strength higher than 400 MPa.

[0017] Furthermore, in step S3, the plain weave portion accounts for 60% of the total area, and the twill weave portion accounts for 40%.

[0018] Furthermore, in step S4, the coating material includes special resin and silica gel.

[0019] Furthermore, in step S4, after the coating material is treated, an ultraviolet absorber is added (the amount added is 2% of the total weight of the coating material).

[0020] Furthermore, in step S5, additional reinforcement tapes are added to key locations of the container bag, such as the bottom, sides and handles.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a warp and weft weaving production process for a container bag, which has the advantages of a double-layer wire drawing process, innovative materials and an optimized structure. First, in terms of production process, the present invention abandons the traditional single-layer wire drawing process and adopts a more advanced double-layer wire drawing process. This process achieves a significant improvement in the wear resistance and aging resistance of the container bag wire through a combination of core layer and outer layer materials. The core layer material is made of high-strength and high-toughness polypropylene (PP) material, and the outer layer is made of polyethylene (PE) material with excellent anti-aging and anti-ultraviolet properties. This double-layer structure not only enhances the strength and durability of the wire, but also effectively resists the erosion of the external environment to the container bag, thereby significantly extending the service life of the container bag.

[0023] Secondly, in terms of material selection, the load-bearing capacity, wear resistance and aging resistance of bulk bags are improved by adding reinforcing materials such as nano-silicon oxide powder and glass fiber during the production process of bulk bags, as well as using high-performance coating materials. The addition of nano-silicon oxide powder and glass fiber makes the fiber structure of the bulk bags tighter and stronger, capable of withstanding greater weight and harsher operating environments. The use of high-performance coating materials further enhances the waterproof, moisture-proof and corrosion-resistant capabilities of the bulk bags, enabling them to maintain excellent performance in various complex environments.

[0024] Finally, in the structural design and sealing method of the container bag, a denser weaving method is adopted, reinforcement strips are added, and prestress is applied to improve the overall structural stability of the container bag. These measures make the container bag less likely to deform when bearing heavy objects and the structure is more solid. At the same time, double stitching technology and hot pressure sealing methods are used to ensure that there is no leakage at the seal, thereby improving the sealing performance of the container bag. This double protection not only effectively prevents leakage and damage of goods during transportation, but also improves the reliability and safety of the container bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a production process flow chart of the present invention;

[0026] Figure 2 This is a diagram showing the advantages of the present invention compared with bulk bags on the market. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] To solve technical problems, such as Figure 1-2 As shown, the following preferred technical solutions are provided:

[0029] Embodiment 1:

[0030] A warp and weft weaving production process for container bags, the method comprising the following steps:

[0031] S1: Prepare polypropylene PP, polyethylene PE and polyester PET polymer synthetic materials to ensure the quality of container bags. The polypropylene PP content should be 70%, the polyethylene PE content should be controlled at 22%, and the polyester PET content should be 8% to balance cost and performance.

[0032] Furthermore, in step S1, reinforcing materials are added, including nano-silicon oxide powder added in an amount of 2% of the total weight of the material, glass fiber with a length of 6 cm and an addition ratio of 10% of the total weight of the material, and antioxidant added in an amount of 0.5% of the total weight of the material, so as to improve the load-bearing capacity and strength of the container bag.

[0033] S2: In the wire drawing process, double-layer wire drawing technology is used to ensure that the drawn wire has uniform diameter and high strength. The core layer uses polypropylene PP material and the outer layer uses polyethylene PE material to enhance the wear resistance and aging resistance of the wire. The wire drawing speed is controlled at 40 meters per minute to ensure the continuity and stability of the wire.

[0034] Furthermore, in step S2, uniform diameter means an error of ±0.2 mm, and high strength means a breaking strength of 600 MPa.

[0035] S3: A denser weaving method is used on the edge of the woven bag, with a weaving density of 130 strands per inch. Additional reinforcement strips are added with a width of 5 cm and one strip is set every 20 cm along the edge. Prestress is applied during the weaving process, and the prestress value is controlled at 35% of the yield strength of the material to enhance the overall structural stability of the woven bag. It is made by combining plain weave and twill weave. High-performance weaving equipment, such as automated weaving machines, is used to ensure the stability and accuracy of the weaving process. The weaving speed is controlled at 12 meters per minute.

[0036] Furthermore, in step S3, the plain weave portion accounts for 60% of the total area, and the twill weave portion accounts for 40% to improve the flexibility and strength of the woven bag.

[0037] S4: The woven semi-finished product is heat treated at a temperature of 125°C for 45 minutes to make its internal structure more robust, thereby improving the mechanical properties of the woven bag. The surface of the woven bag is treated with a high-performance coating material with a coating thickness of 0.2mm. This can not only improve the waterproof and oil-proof performance to IPX7 and the oil-proof level to level 6, but also enhance its wear resistance and anti-aging ability. The wear resistance times are higher than 5,000 times, and the anti-aging life is higher than 5 years.

[0038] Furthermore, in step S4, the coating material includes special resin and silica gel.

[0039] Furthermore, in step S4, after the coating material is treated, an ultraviolet absorber is added in an amount of 2% of the total weight of the coating material to extend the service life of the woven bag in an outdoor environment by up to 10 years.

[0040] S5: Double stitching technology is used in key parts of container bags, such as buckles and strap connections, with a stitch length of 0.4cm for each stitch to ensure firm stitching; the container bags are sealed using hot pressure sealing, with the sealing temperature controlled at 200°C and the sealing time at 7 seconds to ensure no leakage at the seal.

[0041] Furthermore, in step S5, additional reinforcement straps are added to key locations of the container bag, such as the bottom, sides, and handles, to improve overall structural stability.

[0042] Embodiment 2:

[0043] A warp and weft weaving production process for container bags, the method comprising the following steps:

[0044] S1: Prepare polypropylene PP, polyethylene PE and polyester PET polymer synthetic materials to ensure the quality of container bags. The polypropylene PP content should be 75%, the polyethylene PE content should be controlled at 20%, and the polyester PET content should be 5% to balance cost and performance.

[0045] Furthermore, in step S1, reinforcing materials are added, including nano-silicon oxide powder added in an amount of 2% of the total weight of the material, glass fiber with a length of 5 cm and an addition ratio of 10% of the total weight of the material, and antioxidant added in an amount of 0.5% of the total weight of the material, so as to improve the load-bearing capacity and strength of the container bag.

[0046] S2: In the wire drawing process, double-layer wire drawing technology is used to ensure that the drawn wire has uniform diameter and high strength. The core layer uses polypropylene PP material and the outer layer uses polyethylene PE material to enhance the wear resistance and aging resistance of the wire. The wire drawing speed is controlled at 35 meters per minute to ensure the continuity and stability of the wire.

[0047] Furthermore, in step S2, uniform diameter means an error of ±0.2 mm, and high strength means a breaking strength of 500 MPa.

[0048] S3: A denser weaving method is used on the edge of the woven bag, with a weaving density of 120 strands per inch. Additional reinforcement strips are added with a width of 5 cm and one strip is set every 20 cm along the edge. Prestress is applied during the weaving process, and the prestress value is controlled at 40% of the yield strength of the material to enhance the overall structural stability of the woven bag. It is made by combining plain weave and twill weave. High-performance weaving equipment, such as automated weaving machines, is used to ensure the stability and accuracy of the weaving process. The weaving speed is controlled at 15 meters per minute.

[0049] Furthermore, in step S3, the plain weave portion accounts for 60% of the total area, and the twill weave portion accounts for 40% to improve the flexibility and strength of the woven bag.

[0050] S4: The woven semi-finished product is heat treated at a temperature of 135°C for 40 minutes to make its internal structure more robust, thereby improving the mechanical properties of the woven bag. The surface of the woven bag is treated with a high-performance coating material with a coating thickness of 0.3mm. This can not only improve the waterproof and oil-proof performance to IPX7 and the oil-proof level to level 6, but also enhance its wear resistance and anti-aging ability. The wear resistance times are higher than 5,000 times, and the anti-aging life is higher than 5 years.

[0051] Furthermore, in step S4, the coating material includes special resin and silica gel.

[0052] Furthermore, in step S4, after the coating material is treated, an ultraviolet absorber is added in an amount of 2% of the total weight of the coating material to extend the service life of the woven bag in an outdoor environment by up to 10 years.

[0053] S5: Double stitching technology is used in key parts of container bags, such as buckles and strap connections. The stitch length of each stitch line is less than 0.5cm to ensure that the stitching is firm. The container bags are sealed using hot pressure sealing, with the sealing temperature controlled at 180℃ for 5 seconds to ensure that there is no leakage at the seal.

[0054] Furthermore, in step S5, additional reinforcement straps are added to key locations of the container bag, such as the bottom, sides, and handles, to improve overall structural stability.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A warp and weft weaving production process for container bags, characterized by: The method comprises the following steps: S1: Prepare polypropylene (PP), polyethylene (PE) and polyester (PET) polymer synthetic materials to ensure the quality of container bags. The content of polypropylene (PP) should be greater than 60%, the content of polyethylene (PE) should be controlled between 20%-30%, and the content of polyester (PET) should be less than 10%; S2: In the wire drawing process, double-layer wire drawing technology is used to ensure that the drawn wire has uniform diameter and high strength. The core layer uses polypropylene (PP) material and the outer layer uses polyethylene (PE) material to enhance the wear resistance and aging resistance of the wire. The wire drawing speed is controlled at 30-50 meters per minute to ensure the continuity and stability of the wire. S3: A denser weaving method is used at the edge of the woven bag, with a weaving density of more than 120 strands per inch. Additional reinforcement strips are added with a width of 5 cm and one strip is set every 20 cm along the edge. Prestress is applied during the weaving process, and the prestress value is controlled at 30%-40% of the yield strength of the material. It is made by combining plain weaving and twill weaving. High-performance weaving equipment, such as automated weaving machines, is used to ensure the stability and accuracy of the weaving process. The weaving speed is controlled at 10-15 meters per minute. S4: Heat-treat the woven semi-finished product, control the temperature between 120-150℃, and the time for more than 30 minutes. Use high-performance coating materials to treat the surface of the woven bag, and the coating thickness is controlled at 0.2-0.5mm; S5: Double stitching technology is used in key parts of container bags, such as buckles and strap connections. The stitch length of each stitch line is less than 0.5cm to ensure that the stitching is firm. The container bags are sealed by hot pressing. The sealing temperature is controlled at 180-200℃ for more than 5 seconds to ensure that there is no leakage at the seal.

2. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In step S1, reinforcing materials are added, including nano silicon oxide powder (added in an amount of 2% of the total weight of the material), glass fiber (length 5-10 cm, added in a proportion of 10% of the total weight of the material), and antioxidant (added in an amount of 0.5% of the total weight of the material).

3. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In step S2, uniform diameter means an error of ±0.2 mm, and high strength means a breaking strength higher than 400 MPa.

4. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In step S3, the plain weave portion accounts for 60% of the total area, and the twill weave portion accounts for 40%.

5. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In the step S4, the coating material includes special resin and silica gel.

6. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In the step S4, after the coating material is treated, an ultraviolet absorber is added (the amount added is 2% of the total weight of the coating material).

7. The warp and weft weaving production process of a container bag according to claim 1, characterized in that: In step S5, additional reinforcement tapes are added to key locations of the container bag, such as the bottom, sides and handles.

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