Sewing is an essential process in the process of producing jumbo bags, and it is related to the quality of the bags. Therefore, there must be certain technical requirements in the sewing process.
1. The tensile strength of the bottom seam reaches more than 42% of the strength of the base fabric.
2. Container bags are required to be straight and straight, without obvious lack of warp and dimensionality, without obvious defects, without obvious stains on the surface, with clear printed patterns and accurate positions on the bag body.
3. The tensile strength of the side seam reaches more than 67% of the strength of the base fabric.
4. The sewing is required to be straight, with no broken thread, no floating thread, no hanging needle, no less than three stitches at the starting and dropping positions, the length of the suspenders should be equal, and the overlapping seams should be even and straight.
Attention should also be paid to the structure planning when designing the jumbo bag. When planning the structure of the jumbo bag, the relevant specifications stipulate that the strength of the waist hoop should be more than twice the strength of the base fabric. The strength of the waist hoop is inconsistent, causing the base fabric to crack first. In the design, the waist hoop and the base cloth are made of the same strength base cloth material, which can avoid this problem. Sewing technology planning, in addition to the sewing requirements according to the relevant rules, the aging resistance function of the suture and the influence of the seam on the tensile strength of the base fabric should also be considered.