As the international market's demand for container bags continues to grow, my country's exports of container bag products have further increased. At the same time, the international market has become more stringent on the quality requirements of container bag products. Therefore, how to improve the strength of container bag products is reasonable. Material selection, reasonable process ratio, and how to design high-quality container bags based on the actual situation of the enterprise under the premise of implementing national standards are important issues faced by container bag production enterprises. For this reason, attention should be paid to the design of container bags several questions.
Basis and principles of container bag production
The design of container bags must strictly comply with the GB/T10454-2000 standard to ensure that the packaged export goods are intact during loading, unloading, transportation, and storage. The following four major points should be considered in the design of container bags, namely safety, storage, usability, and sealing.
• Safety
Mainly refers to the strength of the container bag. When designing, we must consider the packaging volume, weight of the contents and packaging units (number), as well as the distance of transportation the number of handling times, and what kind of transportation tools and transportation methods are used. In GB/T10454-2000, the technical index requirements for container bag base fabric and slings are strictly stipulated. From a safety perspective, it is clear that all container bag structures in the factory are bottom crane structures, and the safety factor must reach 1:6.
• Custody
Reasonable selection of materials and reasonable process ratio should be based on the user's usage/H conditions. For example, the anti-aging ability of plastic materials under sunlight exposure is a major indicator that determines the quality of container bags. It is also a problem often encountered in the actual use of container bags. Therefore, attention should be paid to the use of anti-UV agents during the production process. and the selection of materials resistant to UV exposure.
• Usability
When designing container bags, full consideration must be given to the specific ways and methods used by customers to use the container bags, such as lifting and transportation methods and the performance of the loaded materials. In addition, you must also consider whether the packaged goods are food and ensure that there is no adverse impact on the packaged food.
• Tightness
Different materials to be packaged have different sealing requirements, such as powders or toxic items, or items that are afraid of being contaminated, which have very strict requirements on sealing performance; special materials that are prone to moisture or mildew also have special requirements for air tightness, so when designing containers When making bags, pay attention to the impact of the base fabric lamination process and sewing process on the sealing performance.
• Issues to note
When designing a container bag, you must first determine the weight of the goods to be loaded, and determine the volume of the container bag based on the specific gravity of the packaged materials. It also depends on whether the loading material is sharp and hard block material. If so, the base fabric should be thicker when designing the container bag. On the contrary, it can be thinner. In actual design, for a container bag with a load of 500kg, the base fabric is generally (150-170) G/m2, the longitudinal and transverse tensile strength of the base fabric is (1470-1700) N/5cm, and the elongation is 20%-35%; For container bags with a load of more than 1,000kg, the base fabric generally uses (170-210) G/m2, the longitudinal and transverse tensile strength of the base fabric (1700-2000) N/5cm, and the elongation rate is 20%-35%.
• Increase monofilament strength
To ensure the strength of the base fabric, the tensile strength of the yarn must be increased. The relative strength of flat yarn should be above 0.4N/tex, and the elongation should be 15%-30%. In the actual processing process, the amount of filling masterbatch needs to be strictly controlled, generally around 2%. If too much masterbatch is added, or recycled materials are added, the strength of the base fabric will be reduced. Therefore, we must strictly control the quality of raw materials and select regularly produced wire drawing raw materials whose melt index reaches the national standard.