Flexible liquid bag for small-volume liquid transportation

Abstract

A flexible liquid bag for small-volume liquid transportation, comprising a bag body, a loading / unloading opening and a both-end-reinforcement protective sleeve; the bag body comprises an outer layer and an inner layer; the outer layer is made of a PP material, having a gram weight of 140-240 gsm, and a weaving density of 12*12-17*17 threads / inch; the inner layer is made of a PE material, having a membrane thickness of 50-300 um; the loading / unloading opening is a valve, the valve being made of a PP material; the both-end-reinforcement protective sleeve is a pocket sleeve having an open end and made of PP by sewing; a high-strength woven belt is sewn on the surface of the pocket sleeve. The liquid bag has a small-size bag body, is more convenient to operate and has an unloading residue less than that of conventional liquid bags; installation of support auxiliary materials such as bulkheads and square steel is not needed, thus achieving more convenient fitting operation; up to three mutually independent liquid bags can be placed in one 40-foot container, and can be filled with different goods according to requirements, allowing for more flexible free combinations.

Description

A flexible liquid bag for transporting small volumes of liquid Technical Field

[0001] The invention patent relates to a liquid bag for transporting small volume liquids in containers and trains, belonging to the field of packaging materials for transportation. Background Art

[0002] Liquid bags, a method for long-distance transport of liquid commodities that first emerged in the 1980s, are primarily used to transport non-hazardous liquids and related chemicals. This technology has seen widespread adoption and significant growth in global logistics and transportation in recent years, primarily due to advances in materials and manufacturing technology for large, flexible liquid bags, as well as the development of containerized transportation. Compared to canned transport, liquid bags offer advantages such as no empty runs, no need for cleaning, low costs, and easy loading and unloading. They are widely used in the food, petroleum, and chemical industries.

[0003] With the increasing prevalence of containerized liquid bags in liquid packaging and transportation, the environments in which they are used are becoming increasingly diverse. With the widespread adoption of containerized liquid bag packaging and transportation in international container transport, this technology has also penetrated into inland onward transportation, especially international rail transport. Winter temperatures in Russia are extremely low, with outdoor temperatures dropping below -40°C. Russia also spans a vast east-west region, stretching from the western region to the eastern coast. Bulk cargo must be transported by rail, over distances of over 5,000 kilometers. When transporting liquid bags by rail, the train generates high-frequency vibrations, causing the bag to vibrate along with the train. The PE film used in liquid bags gradually hardens and loses its flexibility as the temperature drops. Under these high-frequency vibrations, the edges and corners of the bag are prone to developing pinhole-like holes, leading to cargo leakage.

[0004] The materials used in container flexitanks have evolved from cloth-and-rubber to polyurethane, polyvinyl chloride, and polyethylene composites. Currently, to meet increasingly stringent environmental regulations, container flexitanks are primarily made of environmentally friendly polyethylene and are primarily disposable. These flexitanks are available in either multi-layer or single-layer configurations. Multi-layer structures typically utilize four layers of polyethylene for the inner layer and a woven polypropylene outer layer; single-layer structures utilize polyethylene. Current flexitank configurations can develop small holes in corners during transportation, leading to cargo leakage, environmental pollution, and a significant increase in accident handling costs.

[0005] When transporting liquid cargo in larger containers like 40-foot and 53-foot containers or European-style trucks, existing structural flexitanks are too long, causing the liquid to slosh back and forth a greater distance inside the container, resulting in greater impact forces on the ends of the flexitank. The ends of existing structural flexitanks are reinforced by sewing or heat-sealing, but these ends are not strong enough to meet operational requirements, leading to bursting and leaks.

[0006] Factors such as production process, product size, valve safety, vehicle condition, and type of liquid loaded can all affect the safety of liquids, leading to leakage and, in severe cases, tearing of liquid bags during transportation. Therefore, strengthening and improving these key areas is a must-solve issue in the development of liquid bag transportation.

[0007] CN102756523A discloses a flexible liquid packaging bag film for containers. The film is produced using a small three-layer co-extrusion unit using a blend of olefin-based specialty elastomers, mLLDPE, and DLPE. The film exhibits enhanced tensile strength, puncture resistance, ductility, flexural strength, and bending resistance, improving the safety of liquid bags. It is less likely to rupture at low temperatures and reduces transportation costs.

[0008] Summary of the Invention

[0009] The present invention discloses a flexible liquid bag for transporting small-volume liquids, comprising a bag body, a loading and unloading port, and reinforced protective sleeves at both ends; the bag body comprises an outer layer and an inner layer; the outer layer is made of PP material with a gram weight of 140-240gsm and a weaving density of 12*12-17*17 strands / inch; the inner layer is made of PE material with a film thickness of 50-300um; the loading and unloading port is a valve made of PP material; the reinforced protective sleeves at both ends are pockets sewn with PP into an open end, and a high-strength woven belt is sewn on the surface of the pocket.

[0010] The bag body consists of an inner layer of PE tube material and an outer layer of PP tube material; the PE tube material is heat-sealed to form a closed space, which plays a sealing role and protects the quality of the goods; the PP tube material is fixed together by sewing PP and PE, which plays a supporting and protective role, and at the same time fixes the two ends of the PE film to prevent movement inside the PP.

[0011] The length between the PE heat sealing strips is consistent with the length of the PP tube material to prevent the PE film from being stretched after filling.

[0012] The reinforced protective sleeves at both ends are sewn with high-strength woven belts on the surface of the bag cloth. When paving, the woven belts are fixed to the container floor and the top hooks respectively to fix the liquid bag and prevent it from moving back and forth; the number of the high-strength woven belts is 2-4.

[0013] The sewing threads at both ends of the liquid bag are placed in the width direction of the container. After filling, they are close to the side wall of the container for support, reducing the impact on the sewing threads during transportation; there are no sewing threads and heat sealing threads in the length direction of the container, reducing the risk of impact damage to the liquid bag.

[0014] Preferably, the outer PP film barrel material has a gram weight of 160-220 gsm, more preferably 165-180 gsm, and a weaving density of 14*14-15*15 strands / inch.

[0015] Preferably, the inner layer of the PE film barrel material has a film thickness of 100-200 μm, more preferably 120-150 μm; the thickness and number of layers of the PE film barrel material can be selected according to the properties of the filled goods, and the number of layers of the PE film barrel material is 1-10 layers, more preferably 2-5 layers, and most preferably 3-4 layers; the PE film is in direct contact with the liquid, playing a role in sealing and ensuring the quality of the goods.

[0016] Preferably, the loading and unloading port is a 2-5 inch PP valve, more preferably a 3-4 inch PP valve.

[0017] Preferably, the inner PE film barrel material is sealed by melting welding;

[0018] Preferably, the outer PP film barrel material and the inner PE film barrel material are connected together by sewing, so that the inner and outer layers form a whole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The bag is small in size, easier to operate, and has less residue left after unloading than conventional liquid bags. It does not require the installation of supporting materials such as door stops and square steel, making installation more convenient. A 40-foot container can hold up to three independent liquid bags, which can be filled with different goods according to demand, making free matching more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of small-volume transport flexible liquid bag paving;

[0022] Figure 2 Schematic diagram of a small-volume transport flexible liquid bag before installation;

[0023] Among them, 1 liquid bag; 2 bottom braided belt; 3 top braided belt. DETAILED DESCRIPTION

[0024] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

[0025] Example 1

[0026] A flexible liquid bag for transporting small-volume liquids, comprising a bag body, a loading and unloading port, and reinforced protective sleeves at both ends; the inner bag comprises an outer layer and an inner layer; the outer barrel material wrapping layer is made of PP material with a gram weight of 180gsm and a weave density of 16*16 strands / inch; the inner layer is made of PE material with a film thickness of 120um; the loading and unloading port is a 3-inch PP material valve; four high-strength braided belts are sewn on the surface of the reinforced protective sleeves at both ends. When paving, the braided belts are fixed to the container floor and the top hook respectively to fix the liquid bag and prevent it from moving forward and backward

[0027] Example 2

[0028] A flexible liquid bag for liquid transportation, comprising an inner bag, an outer bag, a loading and unloading port, and reinforced protective sleeves at both ends; the inner bag comprises an outer layer and an inner layer; the outer barrel material wrapping layer is made of PP material with a gram weight of 180gsm and a weave density of 16*16 strands / inch; the inner layer is made of PE material with a film thickness of 150um; the loading and unloading port is a 3-inch PP material valve; six high-strength braided belts are sewn on the surface of the reinforced protective sleeves at both ends. When paving, the braided belts are respectively fixed to the container floor and the top hook to fix the liquid bag and prevent it from moving back and forth.

[0029] Example 3

[0030] A flexible liquid bag for liquid transportation, comprising an inner bag, an outer bag, a loading and unloading port, and reinforced protective sleeves at both ends; the inner bag comprises an outer layer and an inner layer; the outer barrel material wrapping layer is made of PP material with a gram weight of 200gsm and a weave density of 14*14 strands / inch; the inner layer is made of PE material with a film thickness of 120um; the loading and unloading port is a 3-inch PP material valve; four high-strength braided belts are sewn on the surface of the reinforced protective sleeves at both ends. When paving, the braided belts are respectively fixed to the container floor and the top hook to fix the liquid bag and prevent it from moving back and forth.

[0031] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A flexible liquid bag for transporting small-volume liquids, comprising a bag body, a loading and unloading port, and reinforced protective sleeves at both ends; the bag body comprises an outer layer and an inner layer; the outer layer is made of PP material, with a gram weight of 140-240gsm and a weaving density of 12*12-17*17 strands / inch; the inner layer is made of PE material, with a film thickness of 50-300um; the loading and unloading port is a valve, and the valve is made of PP material; the reinforced protective sleeves at both ends are pockets sewn with PP into an open end, and a high-strength woven belt is sewn on the surface of the pocket.

2. The liquid bag according to claim 1, characterized in that The bag body consists of an inner layer of PE tube material and an outer layer of PP tube material; the PE tube material is heat-sealed to form a closed space, which plays a sealing role and protects the quality of the goods; the PP tube material fixes PP and PE together through sewing, which plays a supporting and protective role, and at the same time fixes the two ends of the PE film to prevent movement inside the PP.

3. The liquid bag according to claim 1, characterized in that High-strength woven belts are sewn on the surface of the bag cloth for reinforcing protective covers at both ends. When paving, the woven belts are fixed to the container floor and the top hooks respectively to fix the liquid bag to prevent it from moving forward and backward; the number of the high-strength woven belts is 2-4.

4. The liquid bag according to claim 1, characterized in that The sewing lines at both ends of the liquid bag are placed in the width direction of the container. After filling, they are close to the side wall of the container for support to reduce the impact on the sewing lines during transportation. There are no sewing lines and heat sealing lines in the length direction of the container to reduce the risk of impact damage to the liquid bag.

5. The liquid bag according to claim 1, characterized in that Preferably, the outer layer PP film barrel material has a gram weight of 160-220gsm, more preferably 165-180gsm, and a weaving density of 14*14-15*15 strands / inch; the inner layer PE film barrel material has a film thickness of 100-200um, more preferably 120-150μm; the PE film barrel material can select suitable thickness and number of layers according to the properties of the filled goods, and the number of layers of the PE film barrel material is 1-10 layers, more preferably 2-5 layers, and most preferably 3-4 layers; the PE film is in direct contact with the liquid, which plays a role in sealing and ensuring the quality of the goods.

6. The liquid bag according to claim 1, characterized in that The loading and unloading port is selected to be a 2-5 inch PP valve, and more preferably a 3-4 inch PP valve.

7. The liquid bag according to claim 1, characterized in that The inner PE film barrel material is sealed by melting welding; Preferably, the outer PP film barrel material and the inner PE film barrel material are connected together by sewing, so that the inner and outer layers form a whole.

Images