A bag suitable for open storage

Abstract

The application discloses a kind of bulk bags suitable for open-air storage, and the bulk bag body is three-layer composite structure, including the inner layer bag body, middle layer bag body and outer layer bag body sequentially arranged from inside to outside, and the inner layer bag body, middle layer bag body and outer layer bag body three-layer bag body are sequentially adhered together, then fixed by using integrated adhering sewing process, form an integral whole;The inner layer bag body is PP woven bag, forms the inner layer of bulk bag shaping protective layer, and a circle of vertical reinforcing bars is arranged on the inner side wall of the inner layer bag body, and the upper and lower ends of the vertical reinforcing bars are respectively locked edge sewing fixed on the upper and lower edges of the inner layer bag body, to form a three-dimensional shaped support structure;The middle layer bag body is integrally formed PE inner film bag, and is the closed barrier layer of bulk bag, and the middle layer bag body is attached to the outer layer of the inner layer bag body;The outer layer bag body is cylindrical woven bag, forms the anti-aging protective layer of bulk bag, and UV anti-ultraviolet agent is added to the raw material of the flat wire of the cylindrical woven bag. It can be realized that outdoor open-air continuous stacking storage, anti-ultraviolet aging, high weathering resistance.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and more specifically to a container bag suitable for open-air storage. Background Technology

[0002] FIBCs (Flexible Intermediate Bulk Containers) are large-capacity flexible transport packaging containers widely used for the packaging, transfer, and storage of bulk materials such as chemical powders, grain pellets, mineral raw materials, and building material powders. They offer advantages such as large capacity, convenient loading and unloading, and low cost. However, conventional FIBCs currently on the market have significant limitations: their overall structure is simple, their protective performance is weak, they only have basic container functions, and their weather resistance, waterproofing, moisture resistance, and aging resistance are extremely poor.

[0003] In existing technologies, conventional FIBCs (Flexible Intermediate Bulk Containers) are mostly single-layer woven structures without dedicated barrier layers or shaping structures. In open-air environments, sunlight and ultraviolet rays rapidly age the woven fabric, causing it to become brittle, crack, and break. Simultaneously, rainwater and moisture easily penetrate the bag, causing materials to become damp, clump, and deteriorate. Furthermore, the single-layer structure has poor stacking stability, easily leading to bulging, collapse, and deformation during long-term storage. Therefore, existing FIBCs can only be stored and used in indoor warehouses or sheltered spaces and cannot be directly stacked in the open. For production enterprises with large material outputs and long storage periods, this necessitates long-term leasing and construction of dedicated warehouses, significantly increasing storage space, operation, and management costs, severely restricting the efficiency of enterprise production and operation.

[0004] Industry technical research has revealed that existing outdoor protective container bags are mostly simple modifications of the outer film layer, failing to address the synergistic issues of stacking stability, multi-layer barrier, and long-term anti-aging. These bags suffer from drawbacks such as easy deformation during stacking, limited protective layers, rapid UV aging, and susceptibility to material leakage and moisture absorption, thus failing to meet the requirements for long-term outdoor storage. Therefore, there is an urgent need to develop a specialized outdoor storage container bag with a stable structure, airtight sealing, and long-term anti-aging properties to address the core pain points of existing technologies. Summary of the Invention

[0005] This invention aims to solve the technical problems existing in the prior art, and innovatively proposes a container bag suitable for open-air storage, which can realize continuous outdoor open-air storage and has high resistance to ultraviolet aging and weathering.

[0006] To achieve the above objectives, the present invention provides a container bag suitable for open-air storage. The container bag body has a three-layer composite structure, including an inner layer bag body, a middle layer bag body, and an outer layer bag body arranged sequentially from the inside to the outside. The three layers of the bag body are bonded together in pairs in sequence, and then sewn together and fixed by an integrated bonding and sewing process to form a whole.

[0007] The inner bag body is a PP woven bag, forming the inner shaping and protective layer of the container bag. A ring of vertical ribs is provided at intervals on the inner side wall of the inner bag body. The upper and lower ends of the vertical ribs are respectively locked and fixed to the upper and lower edges of the inner bag body by overlock sewing, forming a three-dimensional shaping and support structure.

[0008] The middle layer bag is an integrally formed PE inner film bag, which serves as the airtight barrier layer of the container bag, and the middle layer bag is attached to the outer layer of the inner layer bag to form a whole.

[0009] The outer bag is a tubular woven bag, forming an anti-aging protective layer for the container bag. The flat yarn of the tubular woven bag contains UV-resistant additives. The mass ratio of each component of the UV-resistant additives is: hindered amine light stabilizer 70% to 75%, rutile nano titanium dioxide 25% to 30%; and the total mass of the UV composite additives accounts for 2.5% to 3.0% of the total mass of the flat yarn raw materials.

[0010] In the above scheme: the vertical tie is a braided rope made of PP material; the width of the vertical tie is 15~20mm and the thickness is 0.8~1.0mm.

[0011] In the above scheme: the thickness of the middle layer bag is 0.10~0.18mm, and the transverse tensile strength of the middle layer bag is ≥18MPa, the longitudinal tensile strength is ≥20MPa, and the water vapor permeability is ≤5g / (㎡•24h). It can completely block the penetration of external moisture, humidity, dust and ultraviolet short-wave, while preventing the leakage of internal powdery and granular materials.

[0012] In the above solution: the inner bag body has a weight of 180~200g / ㎡ and a weave density of 12×10 threads / inch. It is entirely airtight, possesses high strength support, and, with internal reinforcing ribs, ensures that multi-layer stacking does not deform, collapse, or bulge.

[0013] In the above scheme: the vertical bracing on the side wall of the inner bag is symmetrically arranged front and back, and the spacing between the vertical bracing is 200-300mm.

[0014] In the above scheme, the production process of the flat yarn is as follows: PP particles, UV composite additives and dispersing additives are added to a high-speed mixer in sequence, and the mixture is mixed at high speed for 10 to 15 minutes at a mixing temperature of 75 to 85°C. After mixing, the mixture is melt-extruded through an extruder, water-cooled and drawn, and then slit, stretched and shaped to form flat yarn.

[0015] In the above scheme: the outer surface of the outer bag is coated with a composite PE waterproof film with a thickness of 0.08 to 0.12 mm.

[0016] In the above solution, the opening and bottom of the container bag are both sewn with multiple layers of overlock stitching with a stitch density of 8-10 stitches / cm, which eliminates the problems of delamination, peeling, and cracking, and improves the fixation effect.

[0017] In summary, the beneficial effects of this invention are:

[0018] 1. The three-layer bag body can form a three-layer functional composite structure with clear functional zoning and strong synergy. It breaks through the technical limitations of traditional single structure and single function of container bags, and achieves three core performances: structural shaping, seepage prevention and moisture prevention, and anti-aging and weather resistance. It specifically solves the core pain points of open-air storage.

[0019] 2. The inner bag body adopts a special PP inner bag + built-in reinforcing structure. Compared with conventional unsupported container bags, it can achieve long-term heavy load, multi-layer stacking without deformation or collapse, and solves the problems of poor stability and low regularity of outdoor stacking. It is suitable for large-scale, long-term outdoor storage and stacking.

[0020] 3. The middle layer of the bag is made of a precise 14-mil thickened PE inner film, which can form a sealed barrier cavity, blocking the transmission of internal and external media in both directions, completely preventing the intrusion of external moisture, light, and dust and the leakage of internal materials. The protective effect is far superior to conventional thin film structures, ensuring the quality stability of materials stored in the open air.

[0021] 4. The outer bag body is woven from flat yarns with added UV-resistant additives and coated with a waterproof film to form an anti-aging protective layer. The UV-resistant additives include hindered amine light stabilizers and rutile nano titanium dioxide. Rutile nano titanium dioxide has strong UV shielding ability and absorbs UVA and UVB in the whole band. Compared with conventional bulk bags, its resistance to UV aging and weathering is greatly improved, effectively delaying the problems of fabric embrittlement, cracking, fading and damage caused by outdoor sun exposure, providing long-lasting weather resistance and significantly extending service life.

[0022] 5. This invention does not rely on indoor warehouse storage and can be directly stored in the open for a long time, which greatly reduces the cost of warehouse leasing, site operation and maintenance, and material transfer for enterprises. It is suitable for the large-scale material storage needs of various industrial, mining, grain storage, and chemical enterprises, and has extremely high industrialization value and broad market application prospects.

[0023] 6. It can be continuously stored outdoors in the open air, with an outdoor weather resistance service life of ≥24 months. The stacking height can reach 3-4 layers, and there is no deformation, leakage, aging or damage under stacking storage conditions. Attached Figure Description

[0024] Figure 1 This is an exploded view of the present invention.

[0025] Figure 2 This is a cross-sectional view of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0027] Example 1

[0028] like Figure 1 , 2 As shown, a type of container bag suitable for open-air storage has a three-layer composite structure, comprising an inner bag 1, a middle bag 2, and an outer bag 3 arranged sequentially from the inside out. The three bags are bonded together in pairs and then sewn together using an integrated bonding and sewing process to form a single unit. Furthermore, the bag opening and bottom are stitched with multiple layers of overlock seams with a stitch density of 8-10 stitches / cm, preventing delamination, peeling, and tearing, thus improving the securing effect.

[0029] The inner bag 1 is a PP woven bag, forming an inner protective layer. The material of the inner bag 1 is high-density polypropylene. In this embodiment, the weight of the inner bag 1 is 200g / ㎡, and the warp and weft density is 12×10 threads / inch. The entire bag is airtight and has high strength support. With the help of internal reinforcement, it can prevent deformation, collapse, and bulging when stacked in multiple layers.

[0030] A ring of vertical reinforcing ribs 4 is spaced apart on the inner sidewall of the inner bag body 1. In this embodiment, the vertical reinforcing ribs 4 are 18mm wide and 1.0mm thick. The vertical reinforcing ribs 4 are made of high-toughness PP braided rope, and their upper and lower ends are respectively sewn to the upper and lower edges of the inner bag body 1 to form a three-dimensional support structure. The vertical reinforcing ribs on the sidewall of the inner bag body 1 are symmetrically arranged front and back, and in this embodiment, the spacing between the vertical reinforcing ribs 4 is 250mm.

[0031] The middle layer bag 2 is a 14-mil PE inner film bag, which is attached to the outside of the inner layer bag 1 to form a single unit. The middle layer bag 2 is integrally formed, and its thickness is 0.10~0.18mm. In this embodiment, 0.14mm is selected, with no seams. The water vapor permeability is ≤5g / (㎡•24h), achieving moisture-proof, light-proof, and leak-proof barrier. Furthermore, the transverse tensile strength of the middle layer bag 2 is ≥18MPa, the longitudinal tensile strength is ≥20MPa, and the water vapor permeability is ≤5g / (㎡•24h), which can completely block the penetration of external moisture, humidity, dust, and short-wave ultraviolet rays, while preventing the leakage of internal powdery or granular materials.

[0032] The outer bag body 3 is a tubular woven bag, forming an anti-aging protective layer for the container bag. The flat yarn of the tubular woven bag contains UV-resistant additives, including hindered amine light stabilizers and nano-titanium dioxide, with a specific mass ratio of 72% hindered amine light stabilizers and 28% rutile nano-titanium dioxide. The total mass of the UV composite additives accounts for 2.8% of the total mass of the flat yarn raw materials.

[0033] The production process of flat yarn is as follows: PP particles, UV composite additives, and dispersing agents are added sequentially to a high-speed mixer and mixed at high speed for 12 minutes at a mixing temperature of 80℃. After mixing, the mixture is melt-extruded through an extruder, water-cooled and drawn, and then slit, stretched, and shaped to form flat yarn. The outer surface of the outer bag body 3 is coated with a composite PE waterproof film with a thickness of 0.08–0.12 mm, achieving a waterproof rating of IPX6.

[0034] After 1000 hours of accelerated aging (equivalent to 3000-5000 hours of natural sun exposure), the woven fabric retained 92.8% of its tensile strength and 90.5% of its elongation at break. Following the aging test, the fabric surface showed no whitening, powdering, or cracking, with virtually no change in appearance. Water vapor permeability remained consistently ≤5g / (㎡•24h), and coating adhesion showed no decline. In actual outdoor ground testing, after 24 months of continuous open-air storage, the structural strength, waterproof barrier performance, and appearance all met the usage standards, with no aging failure, leakage, or deformation issues.

[0035] Actual testing showed that the container bags in this embodiment have excellent weather resistance when stored outdoors. They do not crack, become brittle, or become damp after long-term storage, and they have good stacking performance. They can completely replace indoor storage.

[0036] Example 2

[0037] The difference between this embodiment and Embodiment 1 is that the inner bag 1 has a weight of 180g / ㎡, the vertical bracing 4 has a width of 15mm and a thickness of 0.8mm, and the spacing between the vertical bracing 4 is 200mm.

[0038] The middle layer bag 2 is a 14-mil PE inner film bag, which is blow-molded in one piece, and its tensile strength meets the outdoor protection standards.

[0039] The outer bag body 3 has a PE waterproof coating thickness of 0.12mm, suitable for normal outdoor exposure to sunlight and rain. The UV-resistant additives include hindered amine UV stabilizers and nano-titanium dioxide, with a specific mass ratio of 70% hindered amine stabilizers and 30% rutile nano-titanium dioxide. The total mass of the UV composite additives accounts for 2.5% of the total mass of the flat yarn raw material.

[0040] In the production of flat yarn, PP particles, UV composite additives, and dispersing agents are added to a high-speed mixer in sequence and mixed at high speed for 15 minutes at a mixing temperature of 75°C. After mixing, the yarn is melt-extruded through an extruder, water-cooled and drawn, and then slit, stretched, and shaped to form flat yarn.

[0041] After 1000 hours of accelerated aging testing (equivalent to 3000-5000 hours of natural sun exposure), the woven fabric in this embodiment maintained excellent comprehensive mechanical properties, with a tensile strength retention rate of 91.6% and a breaking elongation retention rate of 89.2%. Following the aging test, the woven fabric surface showed no aging defects such as whitening, powdering, cracking, or peeling; the fabric surface remained smooth and intact, with no significant changes in appearance. The outer composite PE waterproof coating exhibited stable performance, with a consistently stable water vapor permeability of ≤5.2 g / (㎡•24h). The coating bonded firmly to the woven substrate, showing no decrease in adhesion, peeling, or delamination, and the waterproof barrier structure remained intact.

[0042] Under actual outdoor testing conditions, the container bags in this embodiment were continuously stored in the open air for 24 months, experiencing complex outdoor environments such as natural sun exposure, rain, diurnal temperature variations, and damp weathering. The overall structural strength remained intact, with no loosening, deformation, or breakage of the reinforcing bars, and no brittleness, cracking, or bulging of the bag body due to moisture. The waterproof barrier performance was stable, with no leakage or seepage problems. The stacking was neat and highly flat, without any collapse or deformation defects.

[0043] Comprehensive test data shows that the container bags in this embodiment are suitable for normal outdoor exposure to sun and rain, and have excellent weather resistance, structural stability and waterproof protection performance. They have high reliability for long-term outdoor stacking and can completely replace indoor storage, meeting the long-term use requirements for normal outdoor storage, stacking and protection.

[0044] To verify the anti-aging advantages of the container bag of this invention, an artificial accelerated ultraviolet aging control experiment was conducted to simulate a long-term outdoor exposure environment and compare the changes in mechanical retention rate, appearance, and water permeability of the outer woven fabric of the container bag under different additive formulations.

[0045] The experimental conditions were uniformly set as follows: UV aging chamber wavelength 340nm, irradiation intensity 0.89W / (㎡•nm), cyclic aging time 1000h, ambient temperature 60℃, humidity 60%, and the samples were uniformly coated tubular woven fabrics of the same specification, with only the additive formula and addition amount changed.

[0046] The experimental data from each group are compared below:

[0047] Control group 1: The bag body adopts the same bag structure as in Example 1, and a common single hindered amine light stabilizer (conventional addition amount 1.5%) is added to the raw material of flat yarn.

[0048] After 1000 hours of accelerated aging (approximately 3000–5000 hours of natural sun exposure), the woven fabric retained 61.2% of its tensile strength and 55.7% of its elongation at break. The fabric surface showed noticeable whitening, slight powdering, and localized fine cracks. The adhesion of the outer coating decreased, and localized micro-permeability was observed, with a water vapor permeability of 12.6 g / (m²•24h). This did not meet the requirements for long-term open-air storage, and the fabric became brittle and broke after only 12 months of exposure to sunlight.

[0049] Control group 2: The bag body adopts the same bag structure as in Example 1, and conventional compound additives (80% hindered amine + 20% nano titanium dioxide, conventional addition amount 1.5%) are added to the raw material of flat yarn.

[0050] Because the external coating of this control group only used nano-titanium dioxide, it was strong against UVB but weak against UVA; photocatalysis caused aging, resulting in poor anti-aging ability. Therefore, after 1000 hours of accelerated aging, the woven fabric retained 73.5% of its tensile strength and 68.2% of its elongation at break. The fabric surface showed slight fading, with no obvious powdering or cracking. The water vapor permeability was 8.3 g / (㎡•24h), and its protective performance was better than that of a single additive, but its long-term outdoor weather resistance was insufficient. After 18 months of open-air storage, localized aging degradation occurred, and it was easily damaged under stacking stress.

Claims

1. A container bag suitable for open-air storage, characterized in that: The container bag body is a three-layer composite structure, including an inner bag body (1), a middle bag body (2) and an outer bag body (3) arranged from the inside to the outside. The three bag bodies (1), (2) and (3) are bonded together in pairs in sequence and then sewn together using an integrated bonding and sewing process to form a whole. The inner bag body (1) is a PP woven bag, forming the inner shaping and protective layer of the container bag. A ring of vertical tie rods (4) is provided at intervals on the inner side wall of the inner bag body (1). The upper and lower ends of the vertical tie rods (4) are respectively locked and fixed to the upper and lower edges of the inner bag body (1) to form a three-dimensional shaping and support structure. The middle layer bag (2) is an integrally formed PE inner film bag, which is the sealed barrier layer of the container bag, and the middle layer bag (2) is attached to the outside of the inner layer bag (1). The outer bag body (3) is a tubular woven bag, forming an anti-aging protective layer for the container bag. The raw material of the flat yarn of the tubular woven bag contains UV anti-ultraviolet additives. The mass ratio of each component of the UV anti-ultraviolet additives is: hindered amine light stabilizer 70%~75%, rutile nano titanium dioxide 25%~30%; and the total mass of the UV composite additives accounts for 2.5%~3.0% of the total mass of the flat yarn raw material.

2. A container bag suitable for open-air storage according to claim 1, characterized in that: The vertical bracing (4) is a braided rope made of PP material; the vertical bracing (4) has a width of 15~20mm and a thickness of 0.8~1.0mm.

3. A container bag suitable for open-air storage according to claim 2, characterized in that: The thickness of the middle layer bag (2) is 0.10~0.18mm, and the transverse tensile strength of the middle layer bag (2) is ≥18MPa, the longitudinal tensile strength is ≥20MPa, and the water vapor permeability is ≤5g / (㎡•24h).

4. A container bag suitable for open-air storage according to claim 1, characterized in that: The inner bag body (1) has a weight of 180~200g / ㎡ and a weaving density of 12×10 threads / inch.

5. A container bag suitable for open-air storage according to claim 4, characterized in that: The vertical bracing (4) on the side wall of the inner bag body (1) is symmetrically arranged front and back, and the spacing between the vertical bracing (4) is 200-300mm.

6. A container bag suitable for open-air storage according to claim 1, characterized in that: The production process of the flat yarn is as follows: PP particles, UV composite additives and dispersing additives are added to a high-speed mixer in sequence and mixed at high speed for 10 to 15 minutes at a mixing temperature of 75 to 85°C. After mixing, the mixture is melt-extruded through an extruder, water-cooled and drawn, and then slit, stretched and shaped to form flat yarn.

7. A container bag suitable for open-air storage according to claim 6, characterized in that: The outer surface of the outer bag (3) is coated with a composite PE waterproof film with a thickness of 0.08 to 0.12 mm.

8. A container bag suitable for open-air storage according to claim 1, characterized in that: The bag opening and bottom of the container bag are both made with multi-layer overlock stitching, with a stitch density of 8 to 10 stitches / cm.

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