When designing the container bag structure for the ton bag structure, it is stipulated in the relevant standards that the strength of the waist hoop is more than twice the strength of the base fabric. In practice, this design effect is not good. Because the strength of the base fabric and the waist hoop are inconsistent, the base fabric cracks first. When designing, the base fabric material with the same strength as the base fabric can be used to avoid this problem.
In addition to the sewing requirements stipulated in the standard, the sewing process design should also consider the aging resistance of the suture and the influence of the seam on the tensile strength of the base fabric. When packaging powder, poisonous, or materials that are afraid of contamination, the problem of sealing must be solved first. Therefore, in the actual design, thick thread and thin needles are used or non-woven fabrics are used to sew together with the base fabric to improve the airtightness. In addition, when sewing container bags, it is required to select polyester threads with a strength of more than 18ks to ensure that the sewing strength meets the requirements of the national standard. According to the national standard for the design of the inlet and outlet, the longitudinal and transverse tensile strength of the base fabric at the inlet and outlet is ≥828N/50mm, but in practice, due to the higher pressure at the outlet, it can be higher, and the strength of the inlet can be lower For some, the composite film base cloth (90-100) m2 is generally used.
Other factors In the actual design process, container bags without outlet structures can generally meet the safety factor requirements stipulated in national standards. However, the strength of container bags with outlets generally does not meet the standard requirements, which requires consideration of increasing the strength of the bottom opening during design, such as increasing the thickness of the bag bottom base fabric, increasing the reinforcement cloth at the outlet, etc., can solve this problem question. In the actual design process, it is necessary to comprehensively consider various indicators, continuously improve process design, strengthen technological innovation, adopt new materials, new processes, and new methods, and seek good solutions in design to ensure design quality.