1. Regarding the measurement of the diameter of round bags, GB10454-1989 specifies the method of measuring the folded diameter of the bag and converting it to the diameter. Some round FIBCs are made from cylindrical fabric. To calculate the diameter of the finished bag, measuring the folded diameter during production is more convenient. However, some round bags are made from flat, non-cylindrical fabric. During production, the circumference must be converted to the diameter. This, however, can lead to errors in the finished bag's diameter during the sewing process.
Furthermore, in actual testing, when measuring the folded diameter of finished bags, it is difficult to flatten the sample bag completely because the bag has already been processed. The bag's ends (bottom and lid) are the bag's diameter, while the middle portion is larger, and the dimensions decrease towards the ends. This can lead to certain measurement errors during actual measurement. Therefore, from a testing perspective, it is recommended that the diameter of bulk bag samples should be measured directly at the bottom and lid of the bag, rather than using the folding method. This method is both simpler and more accurate.
2. Regarding the measurement of the fold diameter, GB10454-1989 specifies "measuring the fold diameter at two different locations." The Ton Bag editor believes that specific measurement locations should be specified to ensure operability and a more standardized and uniform measurement method.
3. Since the flexible bulk bag dimensions are measured using a steel tape measure, the measurement accuracy should be specified to 1mm.
4. Regarding the standard environment for conditioning and testing plastic specimens, GB10454-1989 specifies that the tensile strength and elongation test conditions are 20±2°C and RH 65%±5%. Currently, international and domestic testing of plastic packaging materials, unless otherwise specified, generally requires testing at 23±1°C (or ±2°C) and RH 50%±2% (or ±5%). The same procedure should be followed for testing samples from slings, ropes, and other locations.
5. Regarding sampling methods for bulk bag connections, GB10454-1989 specifies sample dimensions but does not specify the sampling method. During testing, connections (main body connections, bottom connections, etc.) and tensile stress-bearing areas (110mm width) should be cut using an electric heating method to prevent damage to the sample fibers and seams.