The container bag is different from the ordinary plastic woven bag, because its loading capacity is much larger than that of ordinary packaging, so the stitching of its various parts is also very important, unlike ordinary plastic bags. The thermal bonding is sufficient, it needs to go through multiple processes and other components to be combined.
FIBC
This goal is the most important and critical goal of FIBC. In the plastic woven standard GB/T8946 and the composite plastic GB/T8947 national standard, the tensile load in the seam edge direction and the seam bottom direction is clarified. The main factors that affect the strength of stitching are the variety and type of stitches, the size of the stitch length, stitches, the size of the curling or hemming stitching to the edge of the bag, and the hot and cold cutting methods.
Generally speaking, FIBC production companies should draw up internal control targets for these influencing factors. Regarding the FIBC, according to the national regulations, the tensile strength of the main body joint must reach more than 67% of the fundamental strength, and the tensile strength of the bottom joint must reach more than 42% of the fundamental strength. Regarding the upper sealing of the spigot cement bag, it is recommended to treat it as the strength of the seam bottom direction. Regarding the strength of the seam bottom direction of the paper bag, the target is usually not achieved, so it is recommended to change to a paste bottom bag. Regarding the cold-cut laminating bag, it is recommended to choose the crimping treatment, because the stitches at the edge of the cold-cut may be torn out from the warp threads along with the weft threads. Regarding the woven bag with no strength requirement, the top stitching is one round, the needle pitch can be dense, and the thread can be thin.