WO2025091272A1 - Flexible liquid bag for small-volume liquid transportation - Google Patents

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

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

Background Art

Liquid bag transportation is a long-distance transportation method for liquid commodities that first appeared in the 1980s. It is mainly used to transport non-hazardous liquids and related chemicals. This technology has been widely used and developed in global logistics and transportation in recent years, mainly due to the manufacturing materials and manufacturing technology of large liquid soft bags, as well as the development of container transportation technology. Compared with canned transportation, liquid bags have the advantages of no empty running, no need for cleaning, low cost, and convenient loading and unloading. They have been widely used in food, petroleum, chemical products and other fields.

With the increasing use of container liquid bags in the field of liquid packaging and transportation, the use environment of liquid bags has become more and more diverse. With the widespread use of container liquid bag packaging and transportation in the field of international container transportation, this technology has also penetrated into inland follow-up transportation, especially international railway transportation. The temperature in Russia is extremely low in winter, with the outdoor temperature as low as -40℃ or below. At the same time, Russia has a large east-west span, from the western region to the eastern coast, bulk goods need to be transported by rail, and the transportation distance can reach more than 5,000 kilometers. When using railways to transport liquid bags, high-frequency vibrations will be generated during the train's travel, causing the liquid bags to vibrate with the vehicle. The PE film used for liquid bags will gradually harden and its flexibility will decrease as the temperature decreases. Under high-frequency vibrations, pinhole-shaped broken holes are easily generated at the corners of the liquid bag, causing the goods to leak out.

The manufacturing materials of container liquid bags have evolved from cloth-reinforced rubber materials to polyurethane, polyvinyl chloride, polyethylene composite materials, etc. At present, in order to meet increasingly stringent environmental protection requirements, container liquid bags are mainly made of environmentally friendly polyethylene materials and are mainly disposable. This type of liquid bag is divided into two types: multi-layer and single-layer. The inner layer of the multi-layer structure generally uses four layers of polyethylene material, and the outer layer is polypropylene woven cloth; the single layer is polyethylene material. The liquid bag configuration currently used has small holes in the corners during transportation, which causes cargo leakage, polluting the environment and causing a sharp increase in accident handling costs.

When existing structured liquid bags use larger containers such as 40-foot and 53-foot containers or European trucks to transport liquid goods, the liquid sways back and forth in the container for a longer distance due to the length of the container, resulting in a greater impact force on both ends of the liquid bag. The two ends of the existing structured liquid bags are reinforced by sewing or heat sealing, and their strength cannot meet the use requirements, resulting in burst bags and leakage.

Factors such as product production process, product size, valve safety, transportation vehicle condition, and type of loaded liquid will affect the safety performance of the liquid, causing leakage of the liquid bag during transportation, and even tearing in severe cases. Therefore, strengthening and improving these key parts is an issue that must be solved in the development of liquid bag transportation.

CN102756523A discloses a flexible container liquid packaging bag film, which is produced by blending olefin special elastomer, mLLDPE and DLPE in a small three-layer co-extrusion unit. The puncture resistance, ductility, rubbing resistance and bending resistance are improved, which improves the safety of liquid bags. It is not easy to rupture under low temperature conditions, reducing transportation costs.

Summary of the invention

The 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, 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 braided belt is sewn on the surface of the pocket.

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.

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.

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.

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.

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.

Preferably, the inner layer of the PE film barrel material has a film thickness of 100-200 μm, more preferably 120-150 μm; the PE film barrel material can select the appropriate 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.

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

Preferably, 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.

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

The bag is small in size, easier to operate, and has less residue after unloading than conventional liquid bags. It does not require the installation of supporting auxiliary materials such as door stops and square steel, making installation more convenient. A 40-foot container can hold up to 3 independent liquid bags, which can be filled with different goods according to demand, and the free combination is more flexible.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 Schematic diagram of laying a small volume transport flexible liquid bag;

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

Among them, 1 liquid bag; 2 bottom braided belt; 3 top braided belt.

DETAILED DESCRIPTION

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

Example 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 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 weaving 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, and the braided belts are fixed to the container floor and the top hooks respectively during paving to fix the liquid bag and prevent it from moving forward and backward

Example 2

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 weaving 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; 6 high-strength braided belts are sewn on the surface of the reinforced protective sleeve pocket cloth at both ends, and the braided belts are respectively fixed to the container floor and the top hook during paving to fix the liquid bag and prevent it from moving back and forth.

Example 3

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 weaving 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 sleeve pocket cloth at both ends, and the braided belts are respectively fixed to the container floor and the top hook during paving to fix the liquid bag and prevent it from moving forward and backward.

Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims (7)

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. The liquid bag as described in claim 1 is characterized in that the bag body includes 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 by sewing, which plays a supporting and protective role, and at the same time fixes both ends of the PE film to prevent movement in the PP. The liquid bag as described in claim 1 is characterized in that high-strength woven belts are sewn on the surface of the bag cloth by the reinforced protective sleeves at both ends, and the woven belts are respectively fixed to the container floor and the top hooks during paving to fix the liquid bag to prevent it from moving forward and backward; the number of the high-strength woven belts is 2-4. The liquid bag as described in claim 1 is characterized in that the sewing lines at both ends of the liquid bag are placed in the width direction of the container, and are close to the side wall of the container for support after filling, thereby reducing the impact on the sewing lines during transportation; there are no sewing lines and heat-sealed lines in the length direction of the container, thereby reducing the risk of impact damage to the liquid bag. The liquid bag as described in claim 1 is characterized in that, preferably, the outer layer of PP film barrel material has a gram weight of 160-220gsm, more preferably 165-180gsm, and a weaving density of 14*14-15*15 roots/inch; the inner layer of PE film barrel material has a film thickness of 100-200um, more preferably 120-150μm; the PE film barrel material can select the appropriate 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. The liquid bag as described in claim 1 is characterized in that the loading and unloading port selects a 2-5 inch PP valve, more preferably a 3-4 inch PP valve. 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.