The scope of use of bulk bags in my country is expanding, and the export of bulk bags for special purposes such as calcium carbide and minerals is also increasing. Therefore, the market demand potential for bulk bag products is very large and the development prospects are very broad.
The quality of bulk bags is very important. Therefore, the international market has strict standards for bulk bag products. The focus of the standards is different. Japan pays attention to details, Australia pays attention to form, and the EC standards focus on product performance technical indicators, which are concise. The United States and Europe have strict requirements for bulk bags in terms of UV resistance, aging resistance, safety factors, etc.
my country's plastic woven bulk bags are mainly exported to Japan and South Korea and are vigorously developing markets in the Middle East, Africa, the United States, and Europe. Due to the production of oil and cement, the Middle East has a great demand for bulk bag products; in Africa, almost all of its state-owned oil companies focus on the development of plastic woven products, and the demand for bulk bags is also very large. Africa can accept the quality and grade of China's bulk bags, so there is no big problem in opening up the market in Africa. The United States and Europe have very high quality requirements for bulk bags, and China's bulk bags cannot meet their requirements.
Container bags have a wide range of applications, especially for packaging bulk cement, grain, chemical raw materials, feed, starch, minerals, and other powdered and granular objects, and even dangerous goods such as calcium carbide. Loading, unloading, transportation, and storage are very convenient. Container bag products are in the rising stage of development, especially one-ton and pallet-shaped containers (one pallet holds one container bag or four containers), which are more popular.
"Safety factor" is the ratio between the maximum bearing capacity of the product and the rated design load. It mainly depends on whether the container bag is loaded with several times the content and repeatedly lifted to see whether there are abnormal conditions between the content and the bag body and whether the connection is damaged. In similar standards at home and abroad, the safety factor is generally set at 5-6 times. Container bag products with a five-fold safety factor can be used safely for a longer time. If anti-ultraviolet additives are added, the application range of container bags will be wider and more competitive. This is an indisputable fact.
When the sling is connected to the bag body, there are many forms such as top hanging, bottom hanging, side hanging, etc., and they are connected by stitches, so the stitches are also very important. Only relying on the high strength of the sling, the base fabric and stitches cannot reach a certain strength, and the overall high performance of the container bag cannot be ensured.
Container bags are mainly filled with block, granular, or powdery items, and the physical density and looseness of the contents have obvious effects on the overall results. For the basis for judging the performance of container bags, it is necessary to use products close to the products that customers want to load as much as possible for testing. This is the "standard filler for testing" written in the standard, and the technical standards are used as much as possible to meet the challenges of the market economy.
The standardization of the domestic packaging industry lags behind the development of the packaging industry. The formulation of some standards does not conform to the actual production of products, and the content remains at the level of more than ten years ago. For example, the "Container Bag" standard is formulated by the transportation department, the "Cement Bag" standard is formulated by the building materials department, the "Geotextile" standard is formulated by the textile department, and the "Woven Bag" standard is formulated by the plastic department, etc. Due to the lack of targeted product use and full consideration of the interests between industries, there is no unified, effective, and balanced standard. Calcium carbide is a dangerous item that is flammable and explosive when exposed to heat and has high requirements for packaging. There is a container bag made of multi-layer composite materials that can be used to package dangerous goods such as calcium carbide. The capacity is one ton, and the bag body consists of three layers: outer, middle, and inner. The outer bag is a laminated plastic woven bag, the inner bag is a polyethylene film, and there are four to five layers of special composite materials in the middle that are suitable for packaging such as calcium carbide. This type of container bag has better sealing, higher strength, and lower cost. Compared with traditional iron barrel packaging, it reduces transportation costs by more than 10%, and the loss of powder is only one-tenth, greatly improving economic benefits.
Generally speaking, there will be no problems with container bags that pass the lifting test. If the bag falls off during lifting at ports, railways, and trucks, there are only two situations: one is that the operation is wrong, and the other is that this type of container bag fails to pass the lifting test.
For any container bag that can achieve a safety factor of more than 5 times, two of the four lifting rings or one of the two lifting rings must have a tensile strength of more than two and a half times the rated load. Even if the two lifting straps are disconnected, there will be no problem with the container bag as a whole.